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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
4 | * operating system. INET is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * ROUTE - implementation of the IP router. | |
8 | * | |
02c30a84 | 9 | * Authors: Ross Biro |
1da177e4 LT |
10 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
11 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
12 | * Linus Torvalds, <Linus.Torvalds@helsinki.fi> | |
13 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
14 | * | |
15 | * Fixes: | |
16 | * Alan Cox : Verify area fixes. | |
17 | * Alan Cox : cli() protects routing changes | |
18 | * Rui Oliveira : ICMP routing table updates | |
19 | * (rco@di.uminho.pt) Routing table insertion and update | |
20 | * Linus Torvalds : Rewrote bits to be sensible | |
21 | * Alan Cox : Added BSD route gw semantics | |
e905a9ed | 22 | * Alan Cox : Super /proc >4K |
1da177e4 LT |
23 | * Alan Cox : MTU in route table |
24 | * Alan Cox : MSS actually. Also added the window | |
25 | * clamper. | |
26 | * Sam Lantinga : Fixed route matching in rt_del() | |
27 | * Alan Cox : Routing cache support. | |
28 | * Alan Cox : Removed compatibility cruft. | |
29 | * Alan Cox : RTF_REJECT support. | |
30 | * Alan Cox : TCP irtt support. | |
31 | * Jonathan Naylor : Added Metric support. | |
32 | * Miquel van Smoorenburg : BSD API fixes. | |
33 | * Miquel van Smoorenburg : Metrics. | |
34 | * Alan Cox : Use __u32 properly | |
35 | * Alan Cox : Aligned routing errors more closely with BSD | |
36 | * our system is still very different. | |
37 | * Alan Cox : Faster /proc handling | |
38 | * Alexey Kuznetsov : Massive rework to support tree based routing, | |
39 | * routing caches and better behaviour. | |
e905a9ed | 40 | * |
1da177e4 LT |
41 | * Olaf Erb : irtt wasn't being copied right. |
42 | * Bjorn Ekwall : Kerneld route support. | |
43 | * Alan Cox : Multicast fixed (I hope) | |
44 | * Pavel Krauz : Limited broadcast fixed | |
45 | * Mike McLagan : Routing by source | |
46 | * Alexey Kuznetsov : End of old history. Split to fib.c and | |
47 | * route.c and rewritten from scratch. | |
48 | * Andi Kleen : Load-limit warning messages. | |
49 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. | |
50 | * Vitaly E. Lavrov : Race condition in ip_route_input_slow. | |
51 | * Tobias Ringstrom : Uninitialized res.type in ip_route_output_slow. | |
52 | * Vladimir V. Ivanov : IP rule info (flowid) is really useful. | |
53 | * Marc Boucher : routing by fwmark | |
54 | * Robert Olsson : Added rt_cache statistics | |
55 | * Arnaldo C. Melo : Convert proc stuff to seq_file | |
bb1d23b0 | 56 | * Eric Dumazet : hashed spinlocks and rt_check_expire() fixes. |
cef2685e IS |
57 | * Ilia Sotnikov : Ignore TOS on PMTUD and Redirect |
58 | * Ilia Sotnikov : Removed TOS from hash calculations | |
1da177e4 LT |
59 | */ |
60 | ||
afd46503 JP |
61 | #define pr_fmt(fmt) "IPv4: " fmt |
62 | ||
1da177e4 | 63 | #include <linux/module.h> |
7c0f6ba6 | 64 | #include <linux/uaccess.h> |
1da177e4 LT |
65 | #include <linux/bitops.h> |
66 | #include <linux/types.h> | |
67 | #include <linux/kernel.h> | |
1da177e4 LT |
68 | #include <linux/mm.h> |
69 | #include <linux/string.h> | |
70 | #include <linux/socket.h> | |
71 | #include <linux/sockios.h> | |
72 | #include <linux/errno.h> | |
73 | #include <linux/in.h> | |
74 | #include <linux/inet.h> | |
75 | #include <linux/netdevice.h> | |
76 | #include <linux/proc_fs.h> | |
77 | #include <linux/init.h> | |
78 | #include <linux/skbuff.h> | |
1da177e4 LT |
79 | #include <linux/inetdevice.h> |
80 | #include <linux/igmp.h> | |
81 | #include <linux/pkt_sched.h> | |
82 | #include <linux/mroute.h> | |
83 | #include <linux/netfilter_ipv4.h> | |
84 | #include <linux/random.h> | |
1da177e4 LT |
85 | #include <linux/rcupdate.h> |
86 | #include <linux/times.h> | |
5a0e3ad6 | 87 | #include <linux/slab.h> |
73f156a6 | 88 | #include <linux/jhash.h> |
352e512c | 89 | #include <net/dst.h> |
1b7179d3 | 90 | #include <net/dst_metadata.h> |
457c4cbc | 91 | #include <net/net_namespace.h> |
1da177e4 LT |
92 | #include <net/protocol.h> |
93 | #include <net/ip.h> | |
94 | #include <net/route.h> | |
95 | #include <net/inetpeer.h> | |
96 | #include <net/sock.h> | |
97 | #include <net/ip_fib.h> | |
5481d73f | 98 | #include <net/nexthop.h> |
1da177e4 LT |
99 | #include <net/arp.h> |
100 | #include <net/tcp.h> | |
101 | #include <net/icmp.h> | |
102 | #include <net/xfrm.h> | |
571e7226 | 103 | #include <net/lwtunnel.h> |
8d71740c | 104 | #include <net/netevent.h> |
63f3444f | 105 | #include <net/rtnetlink.h> |
1da177e4 LT |
106 | #ifdef CONFIG_SYSCTL |
107 | #include <linux/sysctl.h> | |
108 | #endif | |
6e5714ea | 109 | #include <net/secure_seq.h> |
1b7179d3 | 110 | #include <net/ip_tunnels.h> |
385add90 | 111 | #include <net/l3mdev.h> |
1da177e4 | 112 | |
b6179813 RP |
113 | #include "fib_lookup.h" |
114 | ||
68a5e3dd | 115 | #define RT_FL_TOS(oldflp4) \ |
f61759e6 | 116 | ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK)) |
1da177e4 | 117 | |
1da177e4 LT |
118 | #define RT_GC_TIMEOUT (300*HZ) |
119 | ||
1da177e4 | 120 | static int ip_rt_max_size; |
817bc4db SH |
121 | static int ip_rt_redirect_number __read_mostly = 9; |
122 | static int ip_rt_redirect_load __read_mostly = HZ / 50; | |
123 | static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); | |
124 | static int ip_rt_error_cost __read_mostly = HZ; | |
125 | static int ip_rt_error_burst __read_mostly = 5 * HZ; | |
817bc4db | 126 | static int ip_rt_mtu_expires __read_mostly = 10 * 60 * HZ; |
c7272c2f | 127 | static u32 ip_rt_min_pmtu __read_mostly = 512 + 20 + 20; |
817bc4db | 128 | static int ip_rt_min_advmss __read_mostly = 256; |
9f28a2fc | 129 | |
deed49df | 130 | static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; |
c7272c2f | 131 | |
1da177e4 LT |
132 | /* |
133 | * Interface to generic destination cache. | |
134 | */ | |
135 | ||
136 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); | |
0dbaee3b | 137 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 138 | static unsigned int ipv4_mtu(const struct dst_entry *dst); |
1da177e4 LT |
139 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); |
140 | static void ipv4_link_failure(struct sk_buff *skb); | |
6700c270 | 141 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
142 | struct sk_buff *skb, u32 mtu, |
143 | bool confirm_neigh); | |
6700c270 DM |
144 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, |
145 | struct sk_buff *skb); | |
caacf05e | 146 | static void ipv4_dst_destroy(struct dst_entry *dst); |
1da177e4 | 147 | |
62fa8a84 DM |
148 | static u32 *ipv4_cow_metrics(struct dst_entry *dst, unsigned long old) |
149 | { | |
31248731 DM |
150 | WARN_ON(1); |
151 | return NULL; | |
62fa8a84 DM |
152 | } |
153 | ||
f894cbf8 DM |
154 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
155 | struct sk_buff *skb, | |
156 | const void *daddr); | |
63fca65d | 157 | static void ipv4_confirm_neigh(const struct dst_entry *dst, const void *daddr); |
d3aaeb38 | 158 | |
1da177e4 LT |
159 | static struct dst_ops ipv4_dst_ops = { |
160 | .family = AF_INET, | |
1da177e4 | 161 | .check = ipv4_dst_check, |
0dbaee3b | 162 | .default_advmss = ipv4_default_advmss, |
ebb762f2 | 163 | .mtu = ipv4_mtu, |
62fa8a84 | 164 | .cow_metrics = ipv4_cow_metrics, |
caacf05e | 165 | .destroy = ipv4_dst_destroy, |
1da177e4 LT |
166 | .negative_advice = ipv4_negative_advice, |
167 | .link_failure = ipv4_link_failure, | |
168 | .update_pmtu = ip_rt_update_pmtu, | |
e47a185b | 169 | .redirect = ip_do_redirect, |
b92dacd4 | 170 | .local_out = __ip_local_out, |
d3aaeb38 | 171 | .neigh_lookup = ipv4_neigh_lookup, |
63fca65d | 172 | .confirm_neigh = ipv4_confirm_neigh, |
1da177e4 LT |
173 | }; |
174 | ||
175 | #define ECN_OR_COST(class) TC_PRIO_##class | |
176 | ||
4839c52b | 177 | const __u8 ip_tos2prio[16] = { |
1da177e4 | 178 | TC_PRIO_BESTEFFORT, |
4a2b9c37 | 179 | ECN_OR_COST(BESTEFFORT), |
1da177e4 LT |
180 | TC_PRIO_BESTEFFORT, |
181 | ECN_OR_COST(BESTEFFORT), | |
182 | TC_PRIO_BULK, | |
183 | ECN_OR_COST(BULK), | |
184 | TC_PRIO_BULK, | |
185 | ECN_OR_COST(BULK), | |
186 | TC_PRIO_INTERACTIVE, | |
187 | ECN_OR_COST(INTERACTIVE), | |
188 | TC_PRIO_INTERACTIVE, | |
189 | ECN_OR_COST(INTERACTIVE), | |
190 | TC_PRIO_INTERACTIVE_BULK, | |
191 | ECN_OR_COST(INTERACTIVE_BULK), | |
192 | TC_PRIO_INTERACTIVE_BULK, | |
193 | ECN_OR_COST(INTERACTIVE_BULK) | |
194 | }; | |
d4a96865 | 195 | EXPORT_SYMBOL(ip_tos2prio); |
1da177e4 | 196 | |
2f970d83 | 197 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
3ed66e91 | 198 | #define RT_CACHE_STAT_INC(field) raw_cpu_inc(rt_cache_stat.field) |
1da177e4 | 199 | |
1da177e4 | 200 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
201 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) |
202 | { | |
29e75252 | 203 | if (*pos) |
89aef892 | 204 | return NULL; |
29e75252 | 205 | return SEQ_START_TOKEN; |
1da177e4 LT |
206 | } |
207 | ||
208 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
209 | { | |
1da177e4 | 210 | ++*pos; |
89aef892 | 211 | return NULL; |
1da177e4 LT |
212 | } |
213 | ||
214 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) | |
215 | { | |
1da177e4 LT |
216 | } |
217 | ||
218 | static int rt_cache_seq_show(struct seq_file *seq, void *v) | |
219 | { | |
220 | if (v == SEQ_START_TOKEN) | |
221 | seq_printf(seq, "%-127s\n", | |
222 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" | |
223 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" | |
224 | "HHUptod\tSpecDst"); | |
e905a9ed | 225 | return 0; |
1da177e4 LT |
226 | } |
227 | ||
f690808e | 228 | static const struct seq_operations rt_cache_seq_ops = { |
1da177e4 LT |
229 | .start = rt_cache_seq_start, |
230 | .next = rt_cache_seq_next, | |
231 | .stop = rt_cache_seq_stop, | |
232 | .show = rt_cache_seq_show, | |
233 | }; | |
234 | ||
235 | static int rt_cache_seq_open(struct inode *inode, struct file *file) | |
236 | { | |
89aef892 | 237 | return seq_open(file, &rt_cache_seq_ops); |
1da177e4 LT |
238 | } |
239 | ||
97a32539 AD |
240 | static const struct proc_ops rt_cache_proc_ops = { |
241 | .proc_open = rt_cache_seq_open, | |
242 | .proc_read = seq_read, | |
243 | .proc_lseek = seq_lseek, | |
244 | .proc_release = seq_release, | |
1da177e4 LT |
245 | }; |
246 | ||
247 | ||
248 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
249 | { | |
250 | int cpu; | |
251 | ||
252 | if (*pos == 0) | |
253 | return SEQ_START_TOKEN; | |
254 | ||
0f23174a | 255 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
256 | if (!cpu_possible(cpu)) |
257 | continue; | |
258 | *pos = cpu+1; | |
2f970d83 | 259 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
260 | } |
261 | return NULL; | |
262 | } | |
263 | ||
264 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
265 | { | |
266 | int cpu; | |
267 | ||
0f23174a | 268 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
269 | if (!cpu_possible(cpu)) |
270 | continue; | |
271 | *pos = cpu+1; | |
2f970d83 | 272 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 | 273 | } |
a3ea8673 | 274 | (*pos)++; |
1da177e4 | 275 | return NULL; |
e905a9ed | 276 | |
1da177e4 LT |
277 | } |
278 | ||
279 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) | |
280 | { | |
281 | ||
282 | } | |
283 | ||
284 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) | |
285 | { | |
286 | struct rt_cache_stat *st = v; | |
287 | ||
288 | if (v == SEQ_START_TOKEN) { | |
5bec0039 | 289 | seq_printf(seq, "entries in_hit in_slow_tot in_slow_mc in_no_route in_brd in_martian_dst in_martian_src out_hit out_slow_tot out_slow_mc gc_total gc_ignored gc_goal_miss gc_dst_overflow in_hlist_search out_hlist_search\n"); |
1da177e4 LT |
290 | return 0; |
291 | } | |
e905a9ed | 292 | |
1da177e4 LT |
293 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
294 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", | |
fc66f95c | 295 | dst_entries_get_slow(&ipv4_dst_ops), |
0baf2b35 | 296 | 0, /* st->in_hit */ |
1da177e4 LT |
297 | st->in_slow_tot, |
298 | st->in_slow_mc, | |
299 | st->in_no_route, | |
300 | st->in_brd, | |
301 | st->in_martian_dst, | |
302 | st->in_martian_src, | |
303 | ||
0baf2b35 | 304 | 0, /* st->out_hit */ |
1da177e4 | 305 | st->out_slow_tot, |
e905a9ed | 306 | st->out_slow_mc, |
1da177e4 | 307 | |
0baf2b35 ED |
308 | 0, /* st->gc_total */ |
309 | 0, /* st->gc_ignored */ | |
310 | 0, /* st->gc_goal_miss */ | |
311 | 0, /* st->gc_dst_overflow */ | |
312 | 0, /* st->in_hlist_search */ | |
313 | 0 /* st->out_hlist_search */ | |
1da177e4 LT |
314 | ); |
315 | return 0; | |
316 | } | |
317 | ||
f690808e | 318 | static const struct seq_operations rt_cpu_seq_ops = { |
1da177e4 LT |
319 | .start = rt_cpu_seq_start, |
320 | .next = rt_cpu_seq_next, | |
321 | .stop = rt_cpu_seq_stop, | |
322 | .show = rt_cpu_seq_show, | |
323 | }; | |
324 | ||
325 | ||
326 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) | |
327 | { | |
328 | return seq_open(file, &rt_cpu_seq_ops); | |
329 | } | |
330 | ||
97a32539 AD |
331 | static const struct proc_ops rt_cpu_proc_ops = { |
332 | .proc_open = rt_cpu_seq_open, | |
333 | .proc_read = seq_read, | |
334 | .proc_lseek = seq_lseek, | |
335 | .proc_release = seq_release, | |
1da177e4 LT |
336 | }; |
337 | ||
c7066f70 | 338 | #ifdef CONFIG_IP_ROUTE_CLASSID |
a661c419 | 339 | static int rt_acct_proc_show(struct seq_file *m, void *v) |
78c686e9 | 340 | { |
a661c419 AD |
341 | struct ip_rt_acct *dst, *src; |
342 | unsigned int i, j; | |
343 | ||
344 | dst = kcalloc(256, sizeof(struct ip_rt_acct), GFP_KERNEL); | |
345 | if (!dst) | |
346 | return -ENOMEM; | |
347 | ||
348 | for_each_possible_cpu(i) { | |
349 | src = (struct ip_rt_acct *)per_cpu_ptr(ip_rt_acct, i); | |
350 | for (j = 0; j < 256; j++) { | |
351 | dst[j].o_bytes += src[j].o_bytes; | |
352 | dst[j].o_packets += src[j].o_packets; | |
353 | dst[j].i_bytes += src[j].i_bytes; | |
354 | dst[j].i_packets += src[j].i_packets; | |
355 | } | |
78c686e9 PE |
356 | } |
357 | ||
a661c419 AD |
358 | seq_write(m, dst, 256 * sizeof(struct ip_rt_acct)); |
359 | kfree(dst); | |
360 | return 0; | |
361 | } | |
78c686e9 | 362 | #endif |
107f1634 | 363 | |
73b38711 | 364 | static int __net_init ip_rt_do_proc_init(struct net *net) |
107f1634 PE |
365 | { |
366 | struct proc_dir_entry *pde; | |
367 | ||
d6444062 | 368 | pde = proc_create("rt_cache", 0444, net->proc_net, |
97a32539 | 369 | &rt_cache_proc_ops); |
107f1634 PE |
370 | if (!pde) |
371 | goto err1; | |
372 | ||
d6444062 | 373 | pde = proc_create("rt_cache", 0444, |
97a32539 | 374 | net->proc_net_stat, &rt_cpu_proc_ops); |
107f1634 PE |
375 | if (!pde) |
376 | goto err2; | |
377 | ||
c7066f70 | 378 | #ifdef CONFIG_IP_ROUTE_CLASSID |
3f3942ac CH |
379 | pde = proc_create_single("rt_acct", 0, net->proc_net, |
380 | rt_acct_proc_show); | |
107f1634 PE |
381 | if (!pde) |
382 | goto err3; | |
383 | #endif | |
384 | return 0; | |
385 | ||
c7066f70 | 386 | #ifdef CONFIG_IP_ROUTE_CLASSID |
107f1634 PE |
387 | err3: |
388 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
389 | #endif | |
390 | err2: | |
391 | remove_proc_entry("rt_cache", net->proc_net); | |
392 | err1: | |
393 | return -ENOMEM; | |
394 | } | |
73b38711 DL |
395 | |
396 | static void __net_exit ip_rt_do_proc_exit(struct net *net) | |
397 | { | |
398 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
399 | remove_proc_entry("rt_cache", net->proc_net); | |
c7066f70 | 400 | #ifdef CONFIG_IP_ROUTE_CLASSID |
73b38711 | 401 | remove_proc_entry("rt_acct", net->proc_net); |
0a931acf | 402 | #endif |
73b38711 DL |
403 | } |
404 | ||
405 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { | |
406 | .init = ip_rt_do_proc_init, | |
407 | .exit = ip_rt_do_proc_exit, | |
408 | }; | |
409 | ||
410 | static int __init ip_rt_proc_init(void) | |
411 | { | |
412 | return register_pernet_subsys(&ip_rt_proc_ops); | |
413 | } | |
414 | ||
107f1634 | 415 | #else |
73b38711 | 416 | static inline int ip_rt_proc_init(void) |
107f1634 PE |
417 | { |
418 | return 0; | |
419 | } | |
1da177e4 | 420 | #endif /* CONFIG_PROC_FS */ |
e905a9ed | 421 | |
4331debc | 422 | static inline bool rt_is_expired(const struct rtable *rth) |
e84f84f2 | 423 | { |
ca4c3fc2 | 424 | return rth->rt_genid != rt_genid_ipv4(dev_net(rth->dst.dev)); |
e84f84f2 DL |
425 | } |
426 | ||
4ccfe6d4 | 427 | void rt_cache_flush(struct net *net) |
1da177e4 | 428 | { |
ca4c3fc2 | 429 | rt_genid_bump_ipv4(net); |
98376387 ED |
430 | } |
431 | ||
f894cbf8 DM |
432 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
433 | struct sk_buff *skb, | |
434 | const void *daddr) | |
3769cffb | 435 | { |
1550c171 | 436 | const struct rtable *rt = container_of(dst, struct rtable, dst); |
d3aaeb38 | 437 | struct net_device *dev = dst->dev; |
3769cffb DM |
438 | struct neighbour *n; |
439 | ||
5c9f7c1d DA |
440 | rcu_read_lock_bh(); |
441 | ||
442 | if (likely(rt->rt_gw_family == AF_INET)) { | |
443 | n = ip_neigh_gw4(dev, rt->rt_gw4); | |
444 | } else if (rt->rt_gw_family == AF_INET6) { | |
445 | n = ip_neigh_gw6(dev, &rt->rt_gw6); | |
446 | } else { | |
447 | __be32 pkey; | |
448 | ||
449 | pkey = skb ? ip_hdr(skb)->daddr : *((__be32 *) daddr); | |
450 | n = ip_neigh_gw4(dev, pkey); | |
451 | } | |
452 | ||
537de0c8 | 453 | if (!IS_ERR(n) && !refcount_inc_not_zero(&n->refcnt)) |
5c9f7c1d DA |
454 | n = NULL; |
455 | ||
456 | rcu_read_unlock_bh(); | |
457 | ||
458 | return n; | |
d3aaeb38 DM |
459 | } |
460 | ||
63fca65d JA |
461 | static void ipv4_confirm_neigh(const struct dst_entry *dst, const void *daddr) |
462 | { | |
1550c171 | 463 | const struct rtable *rt = container_of(dst, struct rtable, dst); |
63fca65d JA |
464 | struct net_device *dev = dst->dev; |
465 | const __be32 *pkey = daddr; | |
63fca65d | 466 | |
6de9c055 | 467 | if (rt->rt_gw_family == AF_INET) { |
1550c171 | 468 | pkey = (const __be32 *)&rt->rt_gw4; |
6de9c055 DA |
469 | } else if (rt->rt_gw_family == AF_INET6) { |
470 | return __ipv6_confirm_neigh_stub(dev, &rt->rt_gw6); | |
471 | } else if (!daddr || | |
63fca65d | 472 | (rt->rt_flags & |
6de9c055 | 473 | (RTCF_MULTICAST | RTCF_BROADCAST | RTCF_LOCAL))) { |
63fca65d | 474 | return; |
6de9c055 | 475 | } |
63fca65d JA |
476 | __ipv4_confirm_neigh(dev, *(__force u32 *)pkey); |
477 | } | |
478 | ||
04ca6973 | 479 | #define IP_IDENTS_SZ 2048u |
04ca6973 | 480 | |
355b590c ED |
481 | static atomic_t *ip_idents __read_mostly; |
482 | static u32 *ip_tstamps __read_mostly; | |
04ca6973 ED |
483 | |
484 | /* In order to protect privacy, we add a perturbation to identifiers | |
485 | * if one generator is seldom used. This makes hard for an attacker | |
486 | * to infer how many packets were sent between two points in time. | |
487 | */ | |
488 | u32 ip_idents_reserve(u32 hash, int segs) | |
489 | { | |
355b590c ED |
490 | u32 *p_tstamp = ip_tstamps + hash % IP_IDENTS_SZ; |
491 | atomic_t *p_id = ip_idents + hash % IP_IDENTS_SZ; | |
6aa7de05 | 492 | u32 old = READ_ONCE(*p_tstamp); |
04ca6973 | 493 | u32 now = (u32)jiffies; |
adb03115 | 494 | u32 new, delta = 0; |
04ca6973 | 495 | |
355b590c | 496 | if (old != now && cmpxchg(p_tstamp, old, now) == old) |
04ca6973 ED |
497 | delta = prandom_u32_max(now - old); |
498 | ||
adb03115 ED |
499 | /* Do not use atomic_add_return() as it makes UBSAN unhappy */ |
500 | do { | |
501 | old = (u32)atomic_read(p_id); | |
502 | new = old + delta + segs; | |
503 | } while (atomic_cmpxchg(p_id, old, new) != old); | |
504 | ||
505 | return new - segs; | |
04ca6973 ED |
506 | } |
507 | EXPORT_SYMBOL(ip_idents_reserve); | |
1da177e4 | 508 | |
b6a7719a | 509 | void __ip_select_ident(struct net *net, struct iphdr *iph, int segs) |
1da177e4 | 510 | { |
73f156a6 | 511 | u32 hash, id; |
1da177e4 | 512 | |
df453700 ED |
513 | /* Note the following code is not safe, but this is okay. */ |
514 | if (unlikely(siphash_key_is_zero(&net->ipv4.ip_id_key))) | |
515 | get_random_bytes(&net->ipv4.ip_id_key, | |
516 | sizeof(net->ipv4.ip_id_key)); | |
1da177e4 | 517 | |
df453700 | 518 | hash = siphash_3u32((__force u32)iph->daddr, |
04ca6973 | 519 | (__force u32)iph->saddr, |
df453700 ED |
520 | iph->protocol, |
521 | &net->ipv4.ip_id_key); | |
73f156a6 ED |
522 | id = ip_idents_reserve(hash, segs); |
523 | iph->id = htons(id); | |
1da177e4 | 524 | } |
4bc2f18b | 525 | EXPORT_SYMBOL(__ip_select_ident); |
1da177e4 | 526 | |
e2d118a1 LC |
527 | static void __build_flow_key(const struct net *net, struct flowi4 *fl4, |
528 | const struct sock *sk, | |
4895c771 DM |
529 | const struct iphdr *iph, |
530 | int oif, u8 tos, | |
531 | u8 prot, u32 mark, int flow_flags) | |
532 | { | |
533 | if (sk) { | |
534 | const struct inet_sock *inet = inet_sk(sk); | |
535 | ||
536 | oif = sk->sk_bound_dev_if; | |
537 | mark = sk->sk_mark; | |
538 | tos = RT_CONN_FLAGS(sk); | |
539 | prot = inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol; | |
540 | } | |
541 | flowi4_init_output(fl4, oif, mark, tos, | |
542 | RT_SCOPE_UNIVERSE, prot, | |
543 | flow_flags, | |
e2d118a1 LC |
544 | iph->daddr, iph->saddr, 0, 0, |
545 | sock_net_uid(net, sk)); | |
4895c771 DM |
546 | } |
547 | ||
5abf7f7e ED |
548 | static void build_skb_flow_key(struct flowi4 *fl4, const struct sk_buff *skb, |
549 | const struct sock *sk) | |
4895c771 | 550 | { |
d109e61b | 551 | const struct net *net = dev_net(skb->dev); |
4895c771 DM |
552 | const struct iphdr *iph = ip_hdr(skb); |
553 | int oif = skb->dev->ifindex; | |
554 | u8 tos = RT_TOS(iph->tos); | |
555 | u8 prot = iph->protocol; | |
556 | u32 mark = skb->mark; | |
557 | ||
d109e61b | 558 | __build_flow_key(net, fl4, sk, iph, oif, tos, prot, mark, 0); |
4895c771 DM |
559 | } |
560 | ||
5abf7f7e | 561 | static void build_sk_flow_key(struct flowi4 *fl4, const struct sock *sk) |
4895c771 DM |
562 | { |
563 | const struct inet_sock *inet = inet_sk(sk); | |
5abf7f7e | 564 | const struct ip_options_rcu *inet_opt; |
4895c771 DM |
565 | __be32 daddr = inet->inet_daddr; |
566 | ||
567 | rcu_read_lock(); | |
568 | inet_opt = rcu_dereference(inet->inet_opt); | |
569 | if (inet_opt && inet_opt->opt.srr) | |
570 | daddr = inet_opt->opt.faddr; | |
571 | flowi4_init_output(fl4, sk->sk_bound_dev_if, sk->sk_mark, | |
572 | RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, | |
573 | inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol, | |
574 | inet_sk_flowi_flags(sk), | |
e2d118a1 | 575 | daddr, inet->inet_saddr, 0, 0, sk->sk_uid); |
4895c771 DM |
576 | rcu_read_unlock(); |
577 | } | |
578 | ||
5abf7f7e ED |
579 | static void ip_rt_build_flow_key(struct flowi4 *fl4, const struct sock *sk, |
580 | const struct sk_buff *skb) | |
4895c771 DM |
581 | { |
582 | if (skb) | |
583 | build_skb_flow_key(fl4, skb, sk); | |
584 | else | |
585 | build_sk_flow_key(fl4, sk); | |
586 | } | |
587 | ||
c5038a83 | 588 | static DEFINE_SPINLOCK(fnhe_lock); |
4895c771 | 589 | |
2ffae99d TT |
590 | static void fnhe_flush_routes(struct fib_nh_exception *fnhe) |
591 | { | |
592 | struct rtable *rt; | |
593 | ||
594 | rt = rcu_dereference(fnhe->fnhe_rth_input); | |
595 | if (rt) { | |
596 | RCU_INIT_POINTER(fnhe->fnhe_rth_input, NULL); | |
95c47f9c | 597 | dst_dev_put(&rt->dst); |
0830106c | 598 | dst_release(&rt->dst); |
2ffae99d TT |
599 | } |
600 | rt = rcu_dereference(fnhe->fnhe_rth_output); | |
601 | if (rt) { | |
602 | RCU_INIT_POINTER(fnhe->fnhe_rth_output, NULL); | |
95c47f9c | 603 | dst_dev_put(&rt->dst); |
0830106c | 604 | dst_release(&rt->dst); |
2ffae99d TT |
605 | } |
606 | } | |
607 | ||
aee06da6 | 608 | static struct fib_nh_exception *fnhe_oldest(struct fnhe_hash_bucket *hash) |
4895c771 DM |
609 | { |
610 | struct fib_nh_exception *fnhe, *oldest; | |
611 | ||
612 | oldest = rcu_dereference(hash->chain); | |
613 | for (fnhe = rcu_dereference(oldest->fnhe_next); fnhe; | |
614 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
615 | if (time_before(fnhe->fnhe_stamp, oldest->fnhe_stamp)) | |
616 | oldest = fnhe; | |
617 | } | |
2ffae99d | 618 | fnhe_flush_routes(oldest); |
4895c771 DM |
619 | return oldest; |
620 | } | |
621 | ||
d3a25c98 DM |
622 | static inline u32 fnhe_hashfun(__be32 daddr) |
623 | { | |
d546c621 | 624 | static u32 fnhe_hashrnd __read_mostly; |
d3a25c98 DM |
625 | u32 hval; |
626 | ||
d546c621 ED |
627 | net_get_random_once(&fnhe_hashrnd, sizeof(fnhe_hashrnd)); |
628 | hval = jhash_1word((__force u32) daddr, fnhe_hashrnd); | |
629 | return hash_32(hval, FNHE_HASH_SHIFT); | |
d3a25c98 DM |
630 | } |
631 | ||
387aa65a TT |
632 | static void fill_route_from_fnhe(struct rtable *rt, struct fib_nh_exception *fnhe) |
633 | { | |
634 | rt->rt_pmtu = fnhe->fnhe_pmtu; | |
d52e5a7e | 635 | rt->rt_mtu_locked = fnhe->fnhe_mtu_locked; |
387aa65a TT |
636 | rt->dst.expires = fnhe->fnhe_expires; |
637 | ||
638 | if (fnhe->fnhe_gw) { | |
639 | rt->rt_flags |= RTCF_REDIRECTED; | |
77d5bc7e | 640 | rt->rt_uses_gateway = 1; |
1550c171 DA |
641 | rt->rt_gw_family = AF_INET; |
642 | rt->rt_gw4 = fnhe->fnhe_gw; | |
387aa65a TT |
643 | } |
644 | } | |
645 | ||
a5995e71 DA |
646 | static void update_or_create_fnhe(struct fib_nh_common *nhc, __be32 daddr, |
647 | __be32 gw, u32 pmtu, bool lock, | |
648 | unsigned long expires) | |
4895c771 | 649 | { |
aee06da6 | 650 | struct fnhe_hash_bucket *hash; |
4895c771 | 651 | struct fib_nh_exception *fnhe; |
387aa65a | 652 | struct rtable *rt; |
cebe84c6 | 653 | u32 genid, hval; |
387aa65a | 654 | unsigned int i; |
4895c771 | 655 | int depth; |
cebe84c6 | 656 | |
a5995e71 | 657 | genid = fnhe_genid(dev_net(nhc->nhc_dev)); |
cebe84c6 | 658 | hval = fnhe_hashfun(daddr); |
aee06da6 | 659 | |
c5038a83 | 660 | spin_lock_bh(&fnhe_lock); |
4895c771 | 661 | |
a5995e71 | 662 | hash = rcu_dereference(nhc->nhc_exceptions); |
4895c771 | 663 | if (!hash) { |
6396bb22 | 664 | hash = kcalloc(FNHE_HASH_SIZE, sizeof(*hash), GFP_ATOMIC); |
4895c771 | 665 | if (!hash) |
aee06da6 | 666 | goto out_unlock; |
a5995e71 | 667 | rcu_assign_pointer(nhc->nhc_exceptions, hash); |
4895c771 DM |
668 | } |
669 | ||
4895c771 DM |
670 | hash += hval; |
671 | ||
672 | depth = 0; | |
673 | for (fnhe = rcu_dereference(hash->chain); fnhe; | |
674 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
675 | if (fnhe->fnhe_daddr == daddr) | |
aee06da6 | 676 | break; |
4895c771 DM |
677 | depth++; |
678 | } | |
679 | ||
aee06da6 | 680 | if (fnhe) { |
cebe84c6 XL |
681 | if (fnhe->fnhe_genid != genid) |
682 | fnhe->fnhe_genid = genid; | |
aee06da6 JA |
683 | if (gw) |
684 | fnhe->fnhe_gw = gw; | |
d52e5a7e | 685 | if (pmtu) { |
aee06da6 | 686 | fnhe->fnhe_pmtu = pmtu; |
d52e5a7e SD |
687 | fnhe->fnhe_mtu_locked = lock; |
688 | } | |
e39d5246 | 689 | fnhe->fnhe_expires = max(1UL, expires); |
387aa65a | 690 | /* Update all cached dsts too */ |
2ffae99d TT |
691 | rt = rcu_dereference(fnhe->fnhe_rth_input); |
692 | if (rt) | |
693 | fill_route_from_fnhe(rt, fnhe); | |
694 | rt = rcu_dereference(fnhe->fnhe_rth_output); | |
387aa65a TT |
695 | if (rt) |
696 | fill_route_from_fnhe(rt, fnhe); | |
aee06da6 JA |
697 | } else { |
698 | if (depth > FNHE_RECLAIM_DEPTH) | |
699 | fnhe = fnhe_oldest(hash); | |
700 | else { | |
701 | fnhe = kzalloc(sizeof(*fnhe), GFP_ATOMIC); | |
702 | if (!fnhe) | |
703 | goto out_unlock; | |
704 | ||
705 | fnhe->fnhe_next = hash->chain; | |
706 | rcu_assign_pointer(hash->chain, fnhe); | |
707 | } | |
cebe84c6 | 708 | fnhe->fnhe_genid = genid; |
aee06da6 JA |
709 | fnhe->fnhe_daddr = daddr; |
710 | fnhe->fnhe_gw = gw; | |
711 | fnhe->fnhe_pmtu = pmtu; | |
d52e5a7e | 712 | fnhe->fnhe_mtu_locked = lock; |
94720e3a | 713 | fnhe->fnhe_expires = max(1UL, expires); |
387aa65a TT |
714 | |
715 | /* Exception created; mark the cached routes for the nexthop | |
716 | * stale, so anyone caching it rechecks if this exception | |
717 | * applies to them. | |
718 | */ | |
0f457a36 | 719 | rt = rcu_dereference(nhc->nhc_rth_input); |
2ffae99d TT |
720 | if (rt) |
721 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
722 | ||
387aa65a TT |
723 | for_each_possible_cpu(i) { |
724 | struct rtable __rcu **prt; | |
0f457a36 | 725 | prt = per_cpu_ptr(nhc->nhc_pcpu_rth_output, i); |
387aa65a TT |
726 | rt = rcu_dereference(*prt); |
727 | if (rt) | |
728 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
729 | } | |
4895c771 | 730 | } |
4895c771 | 731 | |
4895c771 | 732 | fnhe->fnhe_stamp = jiffies; |
aee06da6 JA |
733 | |
734 | out_unlock: | |
c5038a83 | 735 | spin_unlock_bh(&fnhe_lock); |
4895c771 DM |
736 | } |
737 | ||
ceb33206 DM |
738 | static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flowi4 *fl4, |
739 | bool kill_route) | |
1da177e4 | 740 | { |
e47a185b | 741 | __be32 new_gw = icmp_hdr(skb)->un.gateway; |
94206125 | 742 | __be32 old_gw = ip_hdr(skb)->saddr; |
e47a185b | 743 | struct net_device *dev = skb->dev; |
e47a185b | 744 | struct in_device *in_dev; |
4895c771 | 745 | struct fib_result res; |
e47a185b | 746 | struct neighbour *n; |
317805b8 | 747 | struct net *net; |
1da177e4 | 748 | |
94206125 DM |
749 | switch (icmp_hdr(skb)->code & 7) { |
750 | case ICMP_REDIR_NET: | |
751 | case ICMP_REDIR_NETTOS: | |
752 | case ICMP_REDIR_HOST: | |
753 | case ICMP_REDIR_HOSTTOS: | |
754 | break; | |
755 | ||
756 | default: | |
757 | return; | |
758 | } | |
759 | ||
1550c171 | 760 | if (rt->rt_gw_family != AF_INET || rt->rt_gw4 != old_gw) |
e47a185b DM |
761 | return; |
762 | ||
763 | in_dev = __in_dev_get_rcu(dev); | |
764 | if (!in_dev) | |
765 | return; | |
766 | ||
c346dca1 | 767 | net = dev_net(dev); |
9d4fb27d JP |
768 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) || |
769 | ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) || | |
770 | ipv4_is_zeronet(new_gw)) | |
1da177e4 LT |
771 | goto reject_redirect; |
772 | ||
773 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { | |
774 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) | |
775 | goto reject_redirect; | |
776 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) | |
777 | goto reject_redirect; | |
778 | } else { | |
317805b8 | 779 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
1da177e4 LT |
780 | goto reject_redirect; |
781 | } | |
782 | ||
969447f2 SSL |
783 | n = __ipv4_neigh_lookup(rt->dst.dev, new_gw); |
784 | if (!n) | |
785 | n = neigh_create(&arp_tbl, &new_gw, rt->dst.dev); | |
2c1a4311 | 786 | if (!IS_ERR(n)) { |
e47a185b DM |
787 | if (!(n->nud_state & NUD_VALID)) { |
788 | neigh_event_send(n, NULL); | |
789 | } else { | |
0eeb075f | 790 | if (fib_lookup(net, fl4, &res, 0) == 0) { |
eba618ab | 791 | struct fib_nh_common *nhc = FIB_RES_NHC(res); |
4895c771 | 792 | |
a5995e71 | 793 | update_or_create_fnhe(nhc, fl4->daddr, new_gw, |
d52e5a7e SD |
794 | 0, false, |
795 | jiffies + ip_rt_gc_timeout); | |
4895c771 | 796 | } |
ceb33206 DM |
797 | if (kill_route) |
798 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
e47a185b DM |
799 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n); |
800 | } | |
801 | neigh_release(n); | |
802 | } | |
803 | return; | |
804 | ||
805 | reject_redirect: | |
806 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
99ee038d DM |
807 | if (IN_DEV_LOG_MARTIANS(in_dev)) { |
808 | const struct iphdr *iph = (const struct iphdr *) skb->data; | |
809 | __be32 daddr = iph->daddr; | |
810 | __be32 saddr = iph->saddr; | |
811 | ||
e47a185b DM |
812 | net_info_ratelimited("Redirect from %pI4 on %s about %pI4 ignored\n" |
813 | " Advised path = %pI4 -> %pI4\n", | |
814 | &old_gw, dev->name, &new_gw, | |
815 | &saddr, &daddr); | |
99ee038d | 816 | } |
e47a185b DM |
817 | #endif |
818 | ; | |
819 | } | |
820 | ||
4895c771 DM |
821 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
822 | { | |
823 | struct rtable *rt; | |
824 | struct flowi4 fl4; | |
f96ef988 | 825 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
7d995694 | 826 | struct net *net = dev_net(skb->dev); |
f96ef988 MK |
827 | int oif = skb->dev->ifindex; |
828 | u8 tos = RT_TOS(iph->tos); | |
829 | u8 prot = iph->protocol; | |
830 | u32 mark = skb->mark; | |
4895c771 DM |
831 | |
832 | rt = (struct rtable *) dst; | |
833 | ||
7d995694 | 834 | __build_flow_key(net, &fl4, sk, iph, oif, tos, prot, mark, 0); |
ceb33206 | 835 | __ip_do_redirect(rt, skb, &fl4, true); |
4895c771 DM |
836 | } |
837 | ||
1da177e4 LT |
838 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) |
839 | { | |
ee6b9673 | 840 | struct rtable *rt = (struct rtable *)dst; |
1da177e4 LT |
841 | struct dst_entry *ret = dst; |
842 | ||
843 | if (rt) { | |
d11a4dc1 | 844 | if (dst->obsolete > 0) { |
1da177e4 LT |
845 | ip_rt_put(rt); |
846 | ret = NULL; | |
5943634f DM |
847 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || |
848 | rt->dst.expires) { | |
89aef892 | 849 | ip_rt_put(rt); |
1da177e4 LT |
850 | ret = NULL; |
851 | } | |
852 | } | |
853 | return ret; | |
854 | } | |
855 | ||
856 | /* | |
857 | * Algorithm: | |
858 | * 1. The first ip_rt_redirect_number redirects are sent | |
859 | * with exponential backoff, then we stop sending them at all, | |
860 | * assuming that the host ignores our redirects. | |
861 | * 2. If we did not see packets requiring redirects | |
862 | * during ip_rt_redirect_silence, we assume that the host | |
863 | * forgot redirected route and start to send redirects again. | |
864 | * | |
865 | * This algorithm is much cheaper and more intelligent than dumb load limiting | |
866 | * in icmp.c. | |
867 | * | |
868 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) | |
869 | * and "frag. need" (breaks PMTU discovery) in icmp.c. | |
870 | */ | |
871 | ||
872 | void ip_rt_send_redirect(struct sk_buff *skb) | |
873 | { | |
511c3f92 | 874 | struct rtable *rt = skb_rtable(skb); |
30038fc6 | 875 | struct in_device *in_dev; |
92d86829 | 876 | struct inet_peer *peer; |
1d861aa4 | 877 | struct net *net; |
30038fc6 | 878 | int log_martians; |
192132b9 | 879 | int vif; |
1da177e4 | 880 | |
30038fc6 | 881 | rcu_read_lock(); |
d8d1f30b | 882 | in_dev = __in_dev_get_rcu(rt->dst.dev); |
30038fc6 ED |
883 | if (!in_dev || !IN_DEV_TX_REDIRECTS(in_dev)) { |
884 | rcu_read_unlock(); | |
1da177e4 | 885 | return; |
30038fc6 ED |
886 | } |
887 | log_martians = IN_DEV_LOG_MARTIANS(in_dev); | |
385add90 | 888 | vif = l3mdev_master_ifindex_rcu(rt->dst.dev); |
30038fc6 | 889 | rcu_read_unlock(); |
1da177e4 | 890 | |
1d861aa4 | 891 | net = dev_net(rt->dst.dev); |
192132b9 | 892 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, vif, 1); |
92d86829 | 893 | if (!peer) { |
e81da0e1 JA |
894 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, |
895 | rt_nexthop(rt, ip_hdr(skb)->daddr)); | |
92d86829 DM |
896 | return; |
897 | } | |
898 | ||
1da177e4 LT |
899 | /* No redirected packets during ip_rt_redirect_silence; |
900 | * reset the algorithm. | |
901 | */ | |
c09551c6 | 902 | if (time_after(jiffies, peer->rate_last + ip_rt_redirect_silence)) { |
92d86829 | 903 | peer->rate_tokens = 0; |
c09551c6 LB |
904 | peer->n_redirects = 0; |
905 | } | |
1da177e4 LT |
906 | |
907 | /* Too many ignored redirects; do not send anything | |
d8d1f30b | 908 | * set dst.rate_last to the last seen redirected packet. |
1da177e4 | 909 | */ |
c09551c6 | 910 | if (peer->n_redirects >= ip_rt_redirect_number) { |
92d86829 | 911 | peer->rate_last = jiffies; |
1d861aa4 | 912 | goto out_put_peer; |
1da177e4 LT |
913 | } |
914 | ||
915 | /* Check for load limit; set rate_last to the latest sent | |
916 | * redirect. | |
917 | */ | |
57644431 | 918 | if (peer->n_redirects == 0 || |
14fb8a76 | 919 | time_after(jiffies, |
92d86829 | 920 | (peer->rate_last + |
b406472b | 921 | (ip_rt_redirect_load << peer->n_redirects)))) { |
e81da0e1 JA |
922 | __be32 gw = rt_nexthop(rt, ip_hdr(skb)->daddr); |
923 | ||
924 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, gw); | |
92d86829 | 925 | peer->rate_last = jiffies; |
c09551c6 | 926 | ++peer->n_redirects; |
1da177e4 | 927 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
30038fc6 | 928 | if (log_martians && |
b406472b | 929 | peer->n_redirects == ip_rt_redirect_number) |
e87cc472 | 930 | net_warn_ratelimited("host %pI4/if%d ignores redirects for %pI4 to %pI4\n", |
92101b3b | 931 | &ip_hdr(skb)->saddr, inet_iif(skb), |
e81da0e1 | 932 | &ip_hdr(skb)->daddr, &gw); |
1da177e4 LT |
933 | #endif |
934 | } | |
1d861aa4 DM |
935 | out_put_peer: |
936 | inet_putpeer(peer); | |
1da177e4 LT |
937 | } |
938 | ||
939 | static int ip_error(struct sk_buff *skb) | |
940 | { | |
511c3f92 | 941 | struct rtable *rt = skb_rtable(skb); |
e2c0dc1f SS |
942 | struct net_device *dev = skb->dev; |
943 | struct in_device *in_dev; | |
92d86829 | 944 | struct inet_peer *peer; |
1da177e4 | 945 | unsigned long now; |
251da413 | 946 | struct net *net; |
92d86829 | 947 | bool send; |
1da177e4 LT |
948 | int code; |
949 | ||
e2c0dc1f SS |
950 | if (netif_is_l3_master(skb->dev)) { |
951 | dev = __dev_get_by_index(dev_net(skb->dev), IPCB(skb)->iif); | |
952 | if (!dev) | |
953 | goto out; | |
954 | } | |
955 | ||
956 | in_dev = __in_dev_get_rcu(dev); | |
957 | ||
381c759d EB |
958 | /* IP on this device is disabled. */ |
959 | if (!in_dev) | |
960 | goto out; | |
961 | ||
251da413 DM |
962 | net = dev_net(rt->dst.dev); |
963 | if (!IN_DEV_FORWARD(in_dev)) { | |
964 | switch (rt->dst.error) { | |
965 | case EHOSTUNREACH: | |
b45386ef | 966 | __IP_INC_STATS(net, IPSTATS_MIB_INADDRERRORS); |
251da413 DM |
967 | break; |
968 | ||
969 | case ENETUNREACH: | |
b45386ef | 970 | __IP_INC_STATS(net, IPSTATS_MIB_INNOROUTES); |
251da413 DM |
971 | break; |
972 | } | |
973 | goto out; | |
974 | } | |
975 | ||
d8d1f30b | 976 | switch (rt->dst.error) { |
4500ebf8 JP |
977 | case EINVAL: |
978 | default: | |
979 | goto out; | |
980 | case EHOSTUNREACH: | |
981 | code = ICMP_HOST_UNREACH; | |
982 | break; | |
983 | case ENETUNREACH: | |
984 | code = ICMP_NET_UNREACH; | |
b45386ef | 985 | __IP_INC_STATS(net, IPSTATS_MIB_INNOROUTES); |
4500ebf8 JP |
986 | break; |
987 | case EACCES: | |
988 | code = ICMP_PKT_FILTERED; | |
989 | break; | |
1da177e4 LT |
990 | } |
991 | ||
192132b9 | 992 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, |
385add90 | 993 | l3mdev_master_ifindex(skb->dev), 1); |
92d86829 DM |
994 | |
995 | send = true; | |
996 | if (peer) { | |
997 | now = jiffies; | |
998 | peer->rate_tokens += now - peer->rate_last; | |
999 | if (peer->rate_tokens > ip_rt_error_burst) | |
1000 | peer->rate_tokens = ip_rt_error_burst; | |
1001 | peer->rate_last = now; | |
1002 | if (peer->rate_tokens >= ip_rt_error_cost) | |
1003 | peer->rate_tokens -= ip_rt_error_cost; | |
1004 | else | |
1005 | send = false; | |
1d861aa4 | 1006 | inet_putpeer(peer); |
1da177e4 | 1007 | } |
92d86829 DM |
1008 | if (send) |
1009 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); | |
1da177e4 LT |
1010 | |
1011 | out: kfree_skb(skb); | |
1012 | return 0; | |
e905a9ed | 1013 | } |
1da177e4 | 1014 | |
d851c12b | 1015 | static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu) |
1da177e4 | 1016 | { |
d851c12b | 1017 | struct dst_entry *dst = &rt->dst; |
28d35bcd | 1018 | u32 old_mtu = ipv4_mtu(dst); |
4895c771 | 1019 | struct fib_result res; |
d52e5a7e | 1020 | bool lock = false; |
2c8cec5c | 1021 | |
d52e5a7e | 1022 | if (ip_mtu_locked(dst)) |
fa1e492a SK |
1023 | return; |
1024 | ||
28d35bcd | 1025 | if (old_mtu < mtu) |
3cdaa5be LW |
1026 | return; |
1027 | ||
d52e5a7e SD |
1028 | if (mtu < ip_rt_min_pmtu) { |
1029 | lock = true; | |
28d35bcd | 1030 | mtu = min(old_mtu, ip_rt_min_pmtu); |
d52e5a7e | 1031 | } |
2c8cec5c | 1032 | |
28d35bcd | 1033 | if (rt->rt_pmtu == mtu && !lock && |
f016229e TT |
1034 | time_before(jiffies, dst->expires - ip_rt_mtu_expires / 2)) |
1035 | return; | |
1036 | ||
c5ae7d41 | 1037 | rcu_read_lock(); |
0eeb075f | 1038 | if (fib_lookup(dev_net(dst->dev), fl4, &res, 0) == 0) { |
eba618ab | 1039 | struct fib_nh_common *nhc = FIB_RES_NHC(res); |
4895c771 | 1040 | |
a5995e71 | 1041 | update_or_create_fnhe(nhc, fl4->daddr, 0, mtu, lock, |
aee06da6 | 1042 | jiffies + ip_rt_mtu_expires); |
4895c771 | 1043 | } |
c5ae7d41 | 1044 | rcu_read_unlock(); |
1da177e4 LT |
1045 | } |
1046 | ||
4895c771 | 1047 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
1048 | struct sk_buff *skb, u32 mtu, |
1049 | bool confirm_neigh) | |
4895c771 DM |
1050 | { |
1051 | struct rtable *rt = (struct rtable *) dst; | |
1052 | struct flowi4 fl4; | |
1053 | ||
1054 | ip_rt_build_flow_key(&fl4, sk, skb); | |
d851c12b | 1055 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
4895c771 DM |
1056 | } |
1057 | ||
36393395 | 1058 | void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, |
d888f396 | 1059 | int oif, u8 protocol) |
36393395 | 1060 | { |
4895c771 | 1061 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
36393395 DM |
1062 | struct flowi4 fl4; |
1063 | struct rtable *rt; | |
d888f396 | 1064 | u32 mark = IP4_REPLY_MARK(net, skb->mark); |
1b3c61dc | 1065 | |
e2d118a1 | 1066 | __build_flow_key(net, &fl4, NULL, iph, oif, |
d888f396 | 1067 | RT_TOS(iph->tos), protocol, mark, 0); |
36393395 DM |
1068 | rt = __ip_route_output_key(net, &fl4); |
1069 | if (!IS_ERR(rt)) { | |
4895c771 | 1070 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
36393395 DM |
1071 | ip_rt_put(rt); |
1072 | } | |
1073 | } | |
1074 | EXPORT_SYMBOL_GPL(ipv4_update_pmtu); | |
1075 | ||
9cb3a50c | 1076 | static void __ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) |
36393395 | 1077 | { |
4895c771 DM |
1078 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
1079 | struct flowi4 fl4; | |
1080 | struct rtable *rt; | |
36393395 | 1081 | |
e2d118a1 | 1082 | __build_flow_key(sock_net(sk), &fl4, sk, iph, 0, 0, 0, 0, 0); |
1b3c61dc LC |
1083 | |
1084 | if (!fl4.flowi4_mark) | |
1085 | fl4.flowi4_mark = IP4_REPLY_MARK(sock_net(sk), skb->mark); | |
1086 | ||
4895c771 DM |
1087 | rt = __ip_route_output_key(sock_net(sk), &fl4); |
1088 | if (!IS_ERR(rt)) { | |
1089 | __ip_rt_update_pmtu(rt, &fl4, mtu); | |
1090 | ip_rt_put(rt); | |
1091 | } | |
36393395 | 1092 | } |
9cb3a50c SK |
1093 | |
1094 | void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) | |
1095 | { | |
1096 | const struct iphdr *iph = (const struct iphdr *) skb->data; | |
1097 | struct flowi4 fl4; | |
1098 | struct rtable *rt; | |
7f502361 | 1099 | struct dst_entry *odst = NULL; |
b44108db | 1100 | bool new = false; |
e2d118a1 | 1101 | struct net *net = sock_net(sk); |
9cb3a50c SK |
1102 | |
1103 | bh_lock_sock(sk); | |
482fc609 HFS |
1104 | |
1105 | if (!ip_sk_accept_pmtu(sk)) | |
1106 | goto out; | |
1107 | ||
7f502361 | 1108 | odst = sk_dst_get(sk); |
9cb3a50c | 1109 | |
7f502361 | 1110 | if (sock_owned_by_user(sk) || !odst) { |
9cb3a50c SK |
1111 | __ipv4_sk_update_pmtu(skb, sk, mtu); |
1112 | goto out; | |
1113 | } | |
1114 | ||
e2d118a1 | 1115 | __build_flow_key(net, &fl4, sk, iph, 0, 0, 0, 0, 0); |
9cb3a50c | 1116 | |
7f502361 | 1117 | rt = (struct rtable *)odst; |
51456b29 | 1118 | if (odst->obsolete && !odst->ops->check(odst, 0)) { |
9cb3a50c SK |
1119 | rt = ip_route_output_flow(sock_net(sk), &fl4, sk); |
1120 | if (IS_ERR(rt)) | |
1121 | goto out; | |
b44108db SK |
1122 | |
1123 | new = true; | |
9cb3a50c SK |
1124 | } |
1125 | ||
0f6c480f | 1126 | __ip_rt_update_pmtu((struct rtable *) xfrm_dst_path(&rt->dst), &fl4, mtu); |
9cb3a50c | 1127 | |
7f502361 | 1128 | if (!dst_check(&rt->dst, 0)) { |
b44108db SK |
1129 | if (new) |
1130 | dst_release(&rt->dst); | |
1131 | ||
9cb3a50c SK |
1132 | rt = ip_route_output_flow(sock_net(sk), &fl4, sk); |
1133 | if (IS_ERR(rt)) | |
1134 | goto out; | |
1135 | ||
b44108db | 1136 | new = true; |
9cb3a50c SK |
1137 | } |
1138 | ||
b44108db | 1139 | if (new) |
7f502361 | 1140 | sk_dst_set(sk, &rt->dst); |
9cb3a50c SK |
1141 | |
1142 | out: | |
1143 | bh_unlock_sock(sk); | |
7f502361 | 1144 | dst_release(odst); |
9cb3a50c | 1145 | } |
36393395 | 1146 | EXPORT_SYMBOL_GPL(ipv4_sk_update_pmtu); |
f39925db | 1147 | |
b42597e2 | 1148 | void ipv4_redirect(struct sk_buff *skb, struct net *net, |
1042caa7 | 1149 | int oif, u8 protocol) |
b42597e2 | 1150 | { |
4895c771 | 1151 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
b42597e2 DM |
1152 | struct flowi4 fl4; |
1153 | struct rtable *rt; | |
1154 | ||
e2d118a1 | 1155 | __build_flow_key(net, &fl4, NULL, iph, oif, |
1042caa7 | 1156 | RT_TOS(iph->tos), protocol, 0, 0); |
b42597e2 DM |
1157 | rt = __ip_route_output_key(net, &fl4); |
1158 | if (!IS_ERR(rt)) { | |
ceb33206 | 1159 | __ip_do_redirect(rt, skb, &fl4, false); |
b42597e2 DM |
1160 | ip_rt_put(rt); |
1161 | } | |
1162 | } | |
1163 | EXPORT_SYMBOL_GPL(ipv4_redirect); | |
1164 | ||
1165 | void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk) | |
1166 | { | |
4895c771 DM |
1167 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
1168 | struct flowi4 fl4; | |
1169 | struct rtable *rt; | |
e2d118a1 | 1170 | struct net *net = sock_net(sk); |
b42597e2 | 1171 | |
e2d118a1 LC |
1172 | __build_flow_key(net, &fl4, sk, iph, 0, 0, 0, 0, 0); |
1173 | rt = __ip_route_output_key(net, &fl4); | |
4895c771 | 1174 | if (!IS_ERR(rt)) { |
ceb33206 | 1175 | __ip_do_redirect(rt, skb, &fl4, false); |
4895c771 DM |
1176 | ip_rt_put(rt); |
1177 | } | |
b42597e2 DM |
1178 | } |
1179 | EXPORT_SYMBOL_GPL(ipv4_sk_redirect); | |
1180 | ||
efbc368d DM |
1181 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) |
1182 | { | |
1183 | struct rtable *rt = (struct rtable *) dst; | |
1184 | ||
ceb33206 DM |
1185 | /* All IPV4 dsts are created with ->obsolete set to the value |
1186 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1187 | * into this function always. | |
1188 | * | |
387aa65a TT |
1189 | * When a PMTU/redirect information update invalidates a route, |
1190 | * this is indicated by setting obsolete to DST_OBSOLETE_KILL or | |
02afc7ad | 1191 | * DST_OBSOLETE_DEAD. |
ceb33206 | 1192 | */ |
387aa65a | 1193 | if (dst->obsolete != DST_OBSOLETE_FORCE_CHK || rt_is_expired(rt)) |
efbc368d | 1194 | return NULL; |
d11a4dc1 | 1195 | return dst; |
1da177e4 LT |
1196 | } |
1197 | ||
20ff83f1 | 1198 | static void ipv4_send_dest_unreach(struct sk_buff *skb) |
1da177e4 | 1199 | { |
ed0de45a | 1200 | struct ip_options opt; |
c543cb4a | 1201 | int res; |
1da177e4 | 1202 | |
ed0de45a | 1203 | /* Recompile ip options since IPCB may not be valid anymore. |
20ff83f1 | 1204 | * Also check we have a reasonable ipv4 header. |
ed0de45a | 1205 | */ |
20ff83f1 ED |
1206 | if (!pskb_network_may_pull(skb, sizeof(struct iphdr)) || |
1207 | ip_hdr(skb)->version != 4 || ip_hdr(skb)->ihl < 5) | |
1208 | return; | |
c543cb4a | 1209 | |
20ff83f1 ED |
1210 | memset(&opt, 0, sizeof(opt)); |
1211 | if (ip_hdr(skb)->ihl > 5) { | |
1212 | if (!pskb_network_may_pull(skb, ip_hdr(skb)->ihl * 4)) | |
1213 | return; | |
1214 | opt.optlen = ip_hdr(skb)->ihl * 4 - sizeof(struct iphdr); | |
c543cb4a | 1215 | |
20ff83f1 ED |
1216 | rcu_read_lock(); |
1217 | res = __ip_options_compile(dev_net(skb->dev), &opt, skb, NULL); | |
1218 | rcu_read_unlock(); | |
ed0de45a | 1219 | |
20ff83f1 ED |
1220 | if (res) |
1221 | return; | |
1222 | } | |
ed0de45a | 1223 | __icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0, &opt); |
20ff83f1 ED |
1224 | } |
1225 | ||
1226 | static void ipv4_link_failure(struct sk_buff *skb) | |
1227 | { | |
1228 | struct rtable *rt; | |
1229 | ||
1230 | ipv4_send_dest_unreach(skb); | |
1da177e4 | 1231 | |
511c3f92 | 1232 | rt = skb_rtable(skb); |
5943634f DM |
1233 | if (rt) |
1234 | dst_set_expires(&rt->dst, 0); | |
1da177e4 LT |
1235 | } |
1236 | ||
ede2059d | 1237 | static int ip_rt_bug(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1238 | { |
91df42be JP |
1239 | pr_debug("%s: %pI4 -> %pI4, %s\n", |
1240 | __func__, &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, | |
1241 | skb->dev ? skb->dev->name : "?"); | |
1da177e4 | 1242 | kfree_skb(skb); |
c378a9c0 | 1243 | WARN_ON(1); |
1da177e4 LT |
1244 | return 0; |
1245 | } | |
1246 | ||
1247 | /* | |
1248 | We do not cache source address of outgoing interface, | |
1249 | because it is used only by IP RR, TS and SRR options, | |
1250 | so that it out of fast path. | |
1251 | ||
1252 | BTW remember: "addr" is allowed to be not aligned | |
1253 | in IP options! | |
1254 | */ | |
1255 | ||
8e36360a | 1256 | void ip_rt_get_source(u8 *addr, struct sk_buff *skb, struct rtable *rt) |
1da177e4 | 1257 | { |
a61ced5d | 1258 | __be32 src; |
1da177e4 | 1259 | |
c7537967 | 1260 | if (rt_is_output_route(rt)) |
c5be24ff | 1261 | src = ip_hdr(skb)->saddr; |
ebc0ffae | 1262 | else { |
8e36360a | 1263 | struct fib_result res; |
e351bb62 MÅ» |
1264 | struct iphdr *iph = ip_hdr(skb); |
1265 | struct flowi4 fl4 = { | |
1266 | .daddr = iph->daddr, | |
1267 | .saddr = iph->saddr, | |
1268 | .flowi4_tos = RT_TOS(iph->tos), | |
1269 | .flowi4_oif = rt->dst.dev->ifindex, | |
1270 | .flowi4_iif = skb->dev->ifindex, | |
1271 | .flowi4_mark = skb->mark, | |
1272 | }; | |
5e2b61f7 | 1273 | |
ebc0ffae | 1274 | rcu_read_lock(); |
0eeb075f | 1275 | if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res, 0) == 0) |
eba618ab | 1276 | src = fib_result_prefsrc(dev_net(rt->dst.dev), &res); |
ebc0ffae | 1277 | else |
f8126f1d DM |
1278 | src = inet_select_addr(rt->dst.dev, |
1279 | rt_nexthop(rt, iph->daddr), | |
1280 | RT_SCOPE_UNIVERSE); | |
ebc0ffae ED |
1281 | rcu_read_unlock(); |
1282 | } | |
1da177e4 LT |
1283 | memcpy(addr, &src, 4); |
1284 | } | |
1285 | ||
c7066f70 | 1286 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
1287 | static void set_class_tag(struct rtable *rt, u32 tag) |
1288 | { | |
d8d1f30b CG |
1289 | if (!(rt->dst.tclassid & 0xFFFF)) |
1290 | rt->dst.tclassid |= tag & 0xFFFF; | |
1291 | if (!(rt->dst.tclassid & 0xFFFF0000)) | |
1292 | rt->dst.tclassid |= tag & 0xFFFF0000; | |
1da177e4 LT |
1293 | } |
1294 | #endif | |
1295 | ||
0dbaee3b DM |
1296 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst) |
1297 | { | |
7ed14d97 | 1298 | unsigned int header_size = sizeof(struct tcphdr) + sizeof(struct iphdr); |
164a5e7a | 1299 | unsigned int advmss = max_t(unsigned int, ipv4_mtu(dst) - header_size, |
7ed14d97 | 1300 | ip_rt_min_advmss); |
0dbaee3b | 1301 | |
7ed14d97 | 1302 | return min(advmss, IPV4_MAX_PMTU - header_size); |
0dbaee3b DM |
1303 | } |
1304 | ||
ebb762f2 | 1305 | static unsigned int ipv4_mtu(const struct dst_entry *dst) |
d33e4553 | 1306 | { |
261663b0 | 1307 | const struct rtable *rt = (const struct rtable *) dst; |
5943634f DM |
1308 | unsigned int mtu = rt->rt_pmtu; |
1309 | ||
98d75c37 | 1310 | if (!mtu || time_after_eq(jiffies, rt->dst.expires)) |
5943634f | 1311 | mtu = dst_metric_raw(dst, RTAX_MTU); |
618f9bc7 | 1312 | |
38d523e2 | 1313 | if (mtu) |
618f9bc7 SK |
1314 | return mtu; |
1315 | ||
c780a049 | 1316 | mtu = READ_ONCE(dst->dev->mtu); |
d33e4553 | 1317 | |
d52e5a7e | 1318 | if (unlikely(ip_mtu_locked(dst))) { |
77d5bc7e | 1319 | if (rt->rt_uses_gateway && mtu > 576) |
d33e4553 DM |
1320 | mtu = 576; |
1321 | } | |
1322 | ||
14972cbd RP |
1323 | mtu = min_t(unsigned int, mtu, IP_MAX_MTU); |
1324 | ||
1325 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); | |
d33e4553 DM |
1326 | } |
1327 | ||
a5995e71 | 1328 | static void ip_del_fnhe(struct fib_nh_common *nhc, __be32 daddr) |
94720e3a JA |
1329 | { |
1330 | struct fnhe_hash_bucket *hash; | |
1331 | struct fib_nh_exception *fnhe, __rcu **fnhe_p; | |
1332 | u32 hval = fnhe_hashfun(daddr); | |
1333 | ||
1334 | spin_lock_bh(&fnhe_lock); | |
1335 | ||
a5995e71 | 1336 | hash = rcu_dereference_protected(nhc->nhc_exceptions, |
94720e3a JA |
1337 | lockdep_is_held(&fnhe_lock)); |
1338 | hash += hval; | |
1339 | ||
1340 | fnhe_p = &hash->chain; | |
1341 | fnhe = rcu_dereference_protected(*fnhe_p, lockdep_is_held(&fnhe_lock)); | |
1342 | while (fnhe) { | |
1343 | if (fnhe->fnhe_daddr == daddr) { | |
1344 | rcu_assign_pointer(*fnhe_p, rcu_dereference_protected( | |
1345 | fnhe->fnhe_next, lockdep_is_held(&fnhe_lock))); | |
ee60ad21 XL |
1346 | /* set fnhe_daddr to 0 to ensure it won't bind with |
1347 | * new dsts in rt_bind_exception(). | |
1348 | */ | |
1349 | fnhe->fnhe_daddr = 0; | |
94720e3a JA |
1350 | fnhe_flush_routes(fnhe); |
1351 | kfree_rcu(fnhe, rcu); | |
1352 | break; | |
1353 | } | |
1354 | fnhe_p = &fnhe->fnhe_next; | |
1355 | fnhe = rcu_dereference_protected(fnhe->fnhe_next, | |
1356 | lockdep_is_held(&fnhe_lock)); | |
1357 | } | |
1358 | ||
1359 | spin_unlock_bh(&fnhe_lock); | |
1360 | } | |
1361 | ||
a5995e71 DA |
1362 | static struct fib_nh_exception *find_exception(struct fib_nh_common *nhc, |
1363 | __be32 daddr) | |
4895c771 | 1364 | { |
a5995e71 | 1365 | struct fnhe_hash_bucket *hash = rcu_dereference(nhc->nhc_exceptions); |
4895c771 DM |
1366 | struct fib_nh_exception *fnhe; |
1367 | u32 hval; | |
1368 | ||
f2bb4bed DM |
1369 | if (!hash) |
1370 | return NULL; | |
1371 | ||
d3a25c98 | 1372 | hval = fnhe_hashfun(daddr); |
4895c771 DM |
1373 | |
1374 | for (fnhe = rcu_dereference(hash[hval].chain); fnhe; | |
1375 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
94720e3a JA |
1376 | if (fnhe->fnhe_daddr == daddr) { |
1377 | if (fnhe->fnhe_expires && | |
1378 | time_after(jiffies, fnhe->fnhe_expires)) { | |
a5995e71 | 1379 | ip_del_fnhe(nhc, daddr); |
94720e3a JA |
1380 | break; |
1381 | } | |
f2bb4bed | 1382 | return fnhe; |
94720e3a | 1383 | } |
f2bb4bed DM |
1384 | } |
1385 | return NULL; | |
1386 | } | |
aee06da6 | 1387 | |
50d889b1 DA |
1388 | /* MTU selection: |
1389 | * 1. mtu on route is locked - use it | |
1390 | * 2. mtu from nexthop exception | |
1391 | * 3. mtu from egress device | |
1392 | */ | |
1393 | ||
1394 | u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr) | |
1395 | { | |
eba618ab DA |
1396 | struct fib_nh_common *nhc = res->nhc; |
1397 | struct net_device *dev = nhc->nhc_dev; | |
50d889b1 | 1398 | struct fib_info *fi = res->fi; |
50d889b1 DA |
1399 | u32 mtu = 0; |
1400 | ||
1401 | if (dev_net(dev)->ipv4.sysctl_ip_fwd_use_pmtu || | |
1402 | fi->fib_metrics->metrics[RTAX_LOCK - 1] & (1 << RTAX_MTU)) | |
1403 | mtu = fi->fib_mtu; | |
1404 | ||
1405 | if (likely(!mtu)) { | |
1406 | struct fib_nh_exception *fnhe; | |
1407 | ||
a5995e71 | 1408 | fnhe = find_exception(nhc, daddr); |
50d889b1 DA |
1409 | if (fnhe && !time_after_eq(jiffies, fnhe->fnhe_expires)) |
1410 | mtu = fnhe->fnhe_pmtu; | |
1411 | } | |
1412 | ||
1413 | if (likely(!mtu)) | |
1414 | mtu = min(READ_ONCE(dev->mtu), IP_MAX_MTU); | |
1415 | ||
eba618ab | 1416 | return mtu - lwtunnel_headroom(nhc->nhc_lwtstate, mtu); |
50d889b1 DA |
1417 | } |
1418 | ||
caacf05e | 1419 | static bool rt_bind_exception(struct rtable *rt, struct fib_nh_exception *fnhe, |
a4c2fd7f | 1420 | __be32 daddr, const bool do_cache) |
f2bb4bed | 1421 | { |
caacf05e DM |
1422 | bool ret = false; |
1423 | ||
c5038a83 | 1424 | spin_lock_bh(&fnhe_lock); |
f2bb4bed | 1425 | |
c5038a83 | 1426 | if (daddr == fnhe->fnhe_daddr) { |
2ffae99d TT |
1427 | struct rtable __rcu **porig; |
1428 | struct rtable *orig; | |
5aad1de5 | 1429 | int genid = fnhe_genid(dev_net(rt->dst.dev)); |
2ffae99d TT |
1430 | |
1431 | if (rt_is_input_route(rt)) | |
1432 | porig = &fnhe->fnhe_rth_input; | |
1433 | else | |
1434 | porig = &fnhe->fnhe_rth_output; | |
1435 | orig = rcu_dereference(*porig); | |
5aad1de5 TT |
1436 | |
1437 | if (fnhe->fnhe_genid != genid) { | |
1438 | fnhe->fnhe_genid = genid; | |
13d82bf5 SK |
1439 | fnhe->fnhe_gw = 0; |
1440 | fnhe->fnhe_pmtu = 0; | |
1441 | fnhe->fnhe_expires = 0; | |
0e8411e4 | 1442 | fnhe->fnhe_mtu_locked = false; |
2ffae99d TT |
1443 | fnhe_flush_routes(fnhe); |
1444 | orig = NULL; | |
13d82bf5 | 1445 | } |
387aa65a | 1446 | fill_route_from_fnhe(rt, fnhe); |
1550c171 DA |
1447 | if (!rt->rt_gw4) { |
1448 | rt->rt_gw4 = daddr; | |
1449 | rt->rt_gw_family = AF_INET; | |
1450 | } | |
f2bb4bed | 1451 | |
a4c2fd7f | 1452 | if (do_cache) { |
0830106c | 1453 | dst_hold(&rt->dst); |
2ffae99d | 1454 | rcu_assign_pointer(*porig, rt); |
0830106c | 1455 | if (orig) { |
95c47f9c | 1456 | dst_dev_put(&orig->dst); |
0830106c | 1457 | dst_release(&orig->dst); |
0830106c | 1458 | } |
2ffae99d TT |
1459 | ret = true; |
1460 | } | |
c5038a83 DM |
1461 | |
1462 | fnhe->fnhe_stamp = jiffies; | |
c5038a83 DM |
1463 | } |
1464 | spin_unlock_bh(&fnhe_lock); | |
caacf05e DM |
1465 | |
1466 | return ret; | |
54764bb6 ED |
1467 | } |
1468 | ||
87063a1f | 1469 | static bool rt_cache_route(struct fib_nh_common *nhc, struct rtable *rt) |
f2bb4bed | 1470 | { |
d26b3a7c | 1471 | struct rtable *orig, *prev, **p; |
caacf05e | 1472 | bool ret = true; |
f2bb4bed | 1473 | |
d26b3a7c | 1474 | if (rt_is_input_route(rt)) { |
0f457a36 | 1475 | p = (struct rtable **)&nhc->nhc_rth_input; |
d26b3a7c | 1476 | } else { |
0f457a36 | 1477 | p = (struct rtable **)raw_cpu_ptr(nhc->nhc_pcpu_rth_output); |
d26b3a7c | 1478 | } |
f2bb4bed DM |
1479 | orig = *p; |
1480 | ||
0830106c WW |
1481 | /* hold dst before doing cmpxchg() to avoid race condition |
1482 | * on this dst | |
1483 | */ | |
1484 | dst_hold(&rt->dst); | |
f2bb4bed DM |
1485 | prev = cmpxchg(p, orig, rt); |
1486 | if (prev == orig) { | |
0830106c | 1487 | if (orig) { |
5018c596 | 1488 | rt_add_uncached_list(orig); |
0830106c | 1489 | dst_release(&orig->dst); |
0830106c WW |
1490 | } |
1491 | } else { | |
1492 | dst_release(&rt->dst); | |
caacf05e | 1493 | ret = false; |
0830106c | 1494 | } |
caacf05e DM |
1495 | |
1496 | return ret; | |
1497 | } | |
1498 | ||
5055c371 ED |
1499 | struct uncached_list { |
1500 | spinlock_t lock; | |
1501 | struct list_head head; | |
1502 | }; | |
1503 | ||
1504 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt_uncached_list); | |
caacf05e | 1505 | |
510c321b | 1506 | void rt_add_uncached_list(struct rtable *rt) |
caacf05e | 1507 | { |
5055c371 ED |
1508 | struct uncached_list *ul = raw_cpu_ptr(&rt_uncached_list); |
1509 | ||
1510 | rt->rt_uncached_list = ul; | |
1511 | ||
1512 | spin_lock_bh(&ul->lock); | |
1513 | list_add_tail(&rt->rt_uncached, &ul->head); | |
1514 | spin_unlock_bh(&ul->lock); | |
caacf05e DM |
1515 | } |
1516 | ||
510c321b | 1517 | void rt_del_uncached_list(struct rtable *rt) |
caacf05e | 1518 | { |
78df76a0 | 1519 | if (!list_empty(&rt->rt_uncached)) { |
5055c371 ED |
1520 | struct uncached_list *ul = rt->rt_uncached_list; |
1521 | ||
1522 | spin_lock_bh(&ul->lock); | |
caacf05e | 1523 | list_del(&rt->rt_uncached); |
5055c371 | 1524 | spin_unlock_bh(&ul->lock); |
caacf05e DM |
1525 | } |
1526 | } | |
1527 | ||
510c321b XL |
1528 | static void ipv4_dst_destroy(struct dst_entry *dst) |
1529 | { | |
510c321b XL |
1530 | struct rtable *rt = (struct rtable *)dst; |
1531 | ||
1620a336 | 1532 | ip_dst_metrics_put(dst); |
510c321b XL |
1533 | rt_del_uncached_list(rt); |
1534 | } | |
1535 | ||
caacf05e DM |
1536 | void rt_flush_dev(struct net_device *dev) |
1537 | { | |
5055c371 ED |
1538 | struct rtable *rt; |
1539 | int cpu; | |
1540 | ||
1541 | for_each_possible_cpu(cpu) { | |
1542 | struct uncached_list *ul = &per_cpu(rt_uncached_list, cpu); | |
caacf05e | 1543 | |
5055c371 ED |
1544 | spin_lock_bh(&ul->lock); |
1545 | list_for_each_entry(rt, &ul->head, rt_uncached) { | |
caacf05e DM |
1546 | if (rt->dst.dev != dev) |
1547 | continue; | |
8d7017fd | 1548 | rt->dst.dev = blackhole_netdev; |
caacf05e DM |
1549 | dev_hold(rt->dst.dev); |
1550 | dev_put(dev); | |
1551 | } | |
5055c371 | 1552 | spin_unlock_bh(&ul->lock); |
4895c771 DM |
1553 | } |
1554 | } | |
1555 | ||
4331debc | 1556 | static bool rt_cache_valid(const struct rtable *rt) |
d2d68ba9 | 1557 | { |
4331debc ED |
1558 | return rt && |
1559 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
1560 | !rt_is_expired(rt); | |
d2d68ba9 DM |
1561 | } |
1562 | ||
f2bb4bed | 1563 | static void rt_set_nexthop(struct rtable *rt, __be32 daddr, |
5e2b61f7 | 1564 | const struct fib_result *res, |
f2bb4bed | 1565 | struct fib_nh_exception *fnhe, |
a4c2fd7f WW |
1566 | struct fib_info *fi, u16 type, u32 itag, |
1567 | const bool do_cache) | |
1da177e4 | 1568 | { |
caacf05e DM |
1569 | bool cached = false; |
1570 | ||
1da177e4 | 1571 | if (fi) { |
eba618ab | 1572 | struct fib_nh_common *nhc = FIB_RES_NHC(*res); |
4895c771 | 1573 | |
0f5f7d7b | 1574 | if (nhc->nhc_gw_family && nhc->nhc_scope == RT_SCOPE_LINK) { |
77d5bc7e | 1575 | rt->rt_uses_gateway = 1; |
0f5f7d7b DA |
1576 | rt->rt_gw_family = nhc->nhc_gw_family; |
1577 | /* only INET and INET6 are supported */ | |
1578 | if (likely(nhc->nhc_gw_family == AF_INET)) | |
1579 | rt->rt_gw4 = nhc->nhc_gw.ipv4; | |
1580 | else | |
1581 | rt->rt_gw6 = nhc->nhc_gw.ipv6; | |
155e8336 | 1582 | } |
0f5f7d7b | 1583 | |
e1255ed4 DA |
1584 | ip_dst_init_metrics(&rt->dst, fi->fib_metrics); |
1585 | ||
c7066f70 | 1586 | #ifdef CONFIG_IP_ROUTE_CLASSID |
dcb1ecb5 | 1587 | if (nhc->nhc_family == AF_INET) { |
87063a1f DA |
1588 | struct fib_nh *nh; |
1589 | ||
1590 | nh = container_of(nhc, struct fib_nh, nh_common); | |
1591 | rt->dst.tclassid = nh->nh_tclassid; | |
1592 | } | |
1da177e4 | 1593 | #endif |
87063a1f | 1594 | rt->dst.lwtstate = lwtstate_get(nhc->nhc_lwtstate); |
c5038a83 | 1595 | if (unlikely(fnhe)) |
a4c2fd7f WW |
1596 | cached = rt_bind_exception(rt, fnhe, daddr, do_cache); |
1597 | else if (do_cache) | |
87063a1f | 1598 | cached = rt_cache_route(nhc, rt); |
155e8336 JA |
1599 | if (unlikely(!cached)) { |
1600 | /* Routes we intend to cache in nexthop exception or | |
1601 | * FIB nexthop have the DST_NOCACHE bit clear. | |
1602 | * However, if we are unsuccessful at storing this | |
1603 | * route into the cache we really need to set it. | |
1604 | */ | |
1550c171 DA |
1605 | if (!rt->rt_gw4) { |
1606 | rt->rt_gw_family = AF_INET; | |
1607 | rt->rt_gw4 = daddr; | |
1608 | } | |
155e8336 JA |
1609 | rt_add_uncached_list(rt); |
1610 | } | |
1611 | } else | |
caacf05e | 1612 | rt_add_uncached_list(rt); |
defb3519 | 1613 | |
c7066f70 | 1614 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 | 1615 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
85b91b03 | 1616 | set_class_tag(rt, res->tclassid); |
1da177e4 LT |
1617 | #endif |
1618 | set_class_tag(rt, itag); | |
1619 | #endif | |
1da177e4 LT |
1620 | } |
1621 | ||
9ab179d8 DA |
1622 | struct rtable *rt_dst_alloc(struct net_device *dev, |
1623 | unsigned int flags, u16 type, | |
af13b3c3 | 1624 | bool nopolicy, bool noxfrm) |
0c4dcd58 | 1625 | { |
d08c4f35 DA |
1626 | struct rtable *rt; |
1627 | ||
1628 | rt = dst_alloc(&ipv4_dst_ops, dev, 1, DST_OBSOLETE_FORCE_CHK, | |
d08c4f35 | 1629 | (nopolicy ? DST_NOPOLICY : 0) | |
b2a9c0ed | 1630 | (noxfrm ? DST_NOXFRM : 0)); |
d08c4f35 DA |
1631 | |
1632 | if (rt) { | |
1633 | rt->rt_genid = rt_genid_ipv4(dev_net(dev)); | |
1634 | rt->rt_flags = flags; | |
1635 | rt->rt_type = type; | |
1636 | rt->rt_is_input = 0; | |
1637 | rt->rt_iif = 0; | |
1638 | rt->rt_pmtu = 0; | |
d52e5a7e | 1639 | rt->rt_mtu_locked = 0; |
77d5bc7e | 1640 | rt->rt_uses_gateway = 0; |
1550c171 DA |
1641 | rt->rt_gw_family = 0; |
1642 | rt->rt_gw4 = 0; | |
d08c4f35 DA |
1643 | INIT_LIST_HEAD(&rt->rt_uncached); |
1644 | ||
1645 | rt->dst.output = ip_output; | |
1646 | if (flags & RTCF_LOCAL) | |
1647 | rt->dst.input = ip_local_deliver; | |
1648 | } | |
1649 | ||
1650 | return rt; | |
0c4dcd58 | 1651 | } |
9ab179d8 | 1652 | EXPORT_SYMBOL(rt_dst_alloc); |
0c4dcd58 | 1653 | |
5b18f128 SS |
1654 | struct rtable *rt_dst_clone(struct net_device *dev, struct rtable *rt) |
1655 | { | |
1656 | struct rtable *new_rt; | |
1657 | ||
1658 | new_rt = dst_alloc(&ipv4_dst_ops, dev, 1, DST_OBSOLETE_FORCE_CHK, | |
1659 | rt->dst.flags); | |
1660 | ||
1661 | if (new_rt) { | |
1662 | new_rt->rt_genid = rt_genid_ipv4(dev_net(dev)); | |
1663 | new_rt->rt_flags = rt->rt_flags; | |
1664 | new_rt->rt_type = rt->rt_type; | |
1665 | new_rt->rt_is_input = rt->rt_is_input; | |
1666 | new_rt->rt_iif = rt->rt_iif; | |
1667 | new_rt->rt_pmtu = rt->rt_pmtu; | |
1668 | new_rt->rt_mtu_locked = rt->rt_mtu_locked; | |
1669 | new_rt->rt_gw_family = rt->rt_gw_family; | |
1670 | if (rt->rt_gw_family == AF_INET) | |
1671 | new_rt->rt_gw4 = rt->rt_gw4; | |
1672 | else if (rt->rt_gw_family == AF_INET6) | |
1673 | new_rt->rt_gw6 = rt->rt_gw6; | |
1674 | INIT_LIST_HEAD(&new_rt->rt_uncached); | |
1675 | ||
5b18f128 SS |
1676 | new_rt->dst.input = rt->dst.input; |
1677 | new_rt->dst.output = rt->dst.output; | |
1678 | new_rt->dst.error = rt->dst.error; | |
1679 | new_rt->dst.lastuse = jiffies; | |
1680 | new_rt->dst.lwtstate = lwtstate_get(rt->dst.lwtstate); | |
1681 | } | |
1682 | return new_rt; | |
1683 | } | |
1684 | EXPORT_SYMBOL(rt_dst_clone); | |
1685 | ||
96d36220 | 1686 | /* called in rcu_read_lock() section */ |
bc044e8d PA |
1687 | int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1688 | u8 tos, struct net_device *dev, | |
1689 | struct in_device *in_dev, u32 *itag) | |
1da177e4 | 1690 | { |
b5f7e755 | 1691 | int err; |
1da177e4 LT |
1692 | |
1693 | /* Primary sanity checks. */ | |
51456b29 | 1694 | if (!in_dev) |
1da177e4 LT |
1695 | return -EINVAL; |
1696 | ||
1e637c74 | 1697 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
d0daebc3 | 1698 | skb->protocol != htons(ETH_P_IP)) |
bc044e8d | 1699 | return -EINVAL; |
1da177e4 | 1700 | |
75fea73d | 1701 | if (ipv4_is_loopback(saddr) && !IN_DEV_ROUTE_LOCALNET(in_dev)) |
bc044e8d | 1702 | return -EINVAL; |
d0daebc3 | 1703 | |
f97c1e0c | 1704 | if (ipv4_is_zeronet(saddr)) { |
1d2f4ebb EC |
1705 | if (!ipv4_is_local_multicast(daddr) && |
1706 | ip_hdr(skb)->protocol != IPPROTO_IGMP) | |
bc044e8d | 1707 | return -EINVAL; |
b5f7e755 | 1708 | } else { |
9e56e380 | 1709 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
bc044e8d | 1710 | in_dev, itag); |
b5f7e755 | 1711 | if (err < 0) |
bc044e8d | 1712 | return err; |
b5f7e755 | 1713 | } |
bc044e8d PA |
1714 | return 0; |
1715 | } | |
1716 | ||
1717 | /* called in rcu_read_lock() section */ | |
1718 | static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, | |
1719 | u8 tos, struct net_device *dev, int our) | |
1720 | { | |
1721 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
1722 | unsigned int flags = RTCF_MULTICAST; | |
1723 | struct rtable *rth; | |
1724 | u32 itag = 0; | |
1725 | int err; | |
1726 | ||
1727 | err = ip_mc_validate_source(skb, daddr, saddr, tos, dev, in_dev, &itag); | |
1728 | if (err) | |
1729 | return err; | |
1730 | ||
d08c4f35 DA |
1731 | if (our) |
1732 | flags |= RTCF_LOCAL; | |
1733 | ||
1734 | rth = rt_dst_alloc(dev_net(dev)->loopback_dev, flags, RTN_MULTICAST, | |
af13b3c3 | 1735 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false); |
1da177e4 | 1736 | if (!rth) |
bc044e8d | 1737 | return -ENOBUFS; |
1da177e4 | 1738 | |
cf911662 DM |
1739 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1740 | rth->dst.tclassid = itag; | |
1741 | #endif | |
d8d1f30b | 1742 | rth->dst.output = ip_rt_bug; |
9917e1e8 | 1743 | rth->rt_is_input= 1; |
1da177e4 LT |
1744 | |
1745 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c | 1746 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
d8d1f30b | 1747 | rth->dst.input = ip_mr_input; |
1da177e4 LT |
1748 | #endif |
1749 | RT_CACHE_STAT_INC(in_slow_mc); | |
1750 | ||
89aef892 DM |
1751 | skb_dst_set(skb, &rth->dst); |
1752 | return 0; | |
1da177e4 LT |
1753 | } |
1754 | ||
1755 | ||
1756 | static void ip_handle_martian_source(struct net_device *dev, | |
1757 | struct in_device *in_dev, | |
1758 | struct sk_buff *skb, | |
9e12bb22 AV |
1759 | __be32 daddr, |
1760 | __be32 saddr) | |
1da177e4 LT |
1761 | { |
1762 | RT_CACHE_STAT_INC(in_martian_src); | |
1763 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1764 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { | |
1765 | /* | |
1766 | * RFC1812 recommendation, if source is martian, | |
1767 | * the only hint is MAC header. | |
1768 | */ | |
058bd4d2 | 1769 | pr_warn("martian source %pI4 from %pI4, on dev %s\n", |
673d57e7 | 1770 | &daddr, &saddr, dev->name); |
98e399f8 | 1771 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
058bd4d2 JP |
1772 | print_hex_dump(KERN_WARNING, "ll header: ", |
1773 | DUMP_PREFIX_OFFSET, 16, 1, | |
1774 | skb_mac_header(skb), | |
b2c85100 | 1775 | dev->hard_header_len, false); |
1da177e4 LT |
1776 | } |
1777 | } | |
1778 | #endif | |
1779 | } | |
1780 | ||
47360228 | 1781 | /* called in rcu_read_lock() section */ |
5969f71d | 1782 | static int __mkroute_input(struct sk_buff *skb, |
982721f3 | 1783 | const struct fib_result *res, |
5969f71d | 1784 | struct in_device *in_dev, |
c6cffba4 | 1785 | __be32 daddr, __be32 saddr, u32 tos) |
1da177e4 | 1786 | { |
eba618ab DA |
1787 | struct fib_nh_common *nhc = FIB_RES_NHC(*res); |
1788 | struct net_device *dev = nhc->nhc_dev; | |
2ffae99d | 1789 | struct fib_nh_exception *fnhe; |
1da177e4 LT |
1790 | struct rtable *rth; |
1791 | int err; | |
1792 | struct in_device *out_dev; | |
d2d68ba9 | 1793 | bool do_cache; |
fbdc0ad0 | 1794 | u32 itag = 0; |
1da177e4 LT |
1795 | |
1796 | /* get a working reference to the output device */ | |
eba618ab | 1797 | out_dev = __in_dev_get_rcu(dev); |
51456b29 | 1798 | if (!out_dev) { |
e87cc472 | 1799 | net_crit_ratelimited("Bug in ip_route_input_slow(). Please report.\n"); |
1da177e4 LT |
1800 | return -EINVAL; |
1801 | } | |
1802 | ||
5c04c819 | 1803 | err = fib_validate_source(skb, saddr, daddr, tos, FIB_RES_OIF(*res), |
9e56e380 | 1804 | in_dev->dev, in_dev, &itag); |
1da177e4 | 1805 | if (err < 0) { |
e905a9ed | 1806 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
1da177e4 | 1807 | saddr); |
e905a9ed | 1808 | |
1da177e4 LT |
1809 | goto cleanup; |
1810 | } | |
1811 | ||
e81da0e1 JA |
1812 | do_cache = res->fi && !itag; |
1813 | if (out_dev == in_dev && err && IN_DEV_TX_REDIRECTS(out_dev) && | |
eba618ab | 1814 | skb->protocol == htons(ETH_P_IP)) { |
bdf00467 | 1815 | __be32 gw; |
eba618ab | 1816 | |
bdf00467 | 1817 | gw = nhc->nhc_gw_family == AF_INET ? nhc->nhc_gw.ipv4 : 0; |
eba618ab DA |
1818 | if (IN_DEV_SHARED_MEDIA(out_dev) || |
1819 | inet_addr_onlink(out_dev, saddr, gw)) | |
1820 | IPCB(skb)->flags |= IPSKB_DOREDIRECT; | |
1821 | } | |
1da177e4 LT |
1822 | |
1823 | if (skb->protocol != htons(ETH_P_IP)) { | |
1824 | /* Not IP (i.e. ARP). Do not create route, if it is | |
1825 | * invalid for proxy arp. DNAT routes are always valid. | |
65324144 JDB |
1826 | * |
1827 | * Proxy arp feature have been extended to allow, ARP | |
1828 | * replies back to the same interface, to support | |
1829 | * Private VLAN switch technologies. See arp.c. | |
1da177e4 | 1830 | */ |
65324144 JDB |
1831 | if (out_dev == in_dev && |
1832 | IN_DEV_PROXY_ARP_PVLAN(in_dev) == 0) { | |
1da177e4 LT |
1833 | err = -EINVAL; |
1834 | goto cleanup; | |
1835 | } | |
1836 | } | |
1837 | ||
a5995e71 | 1838 | fnhe = find_exception(nhc, daddr); |
e81da0e1 | 1839 | if (do_cache) { |
94720e3a | 1840 | if (fnhe) |
2ffae99d | 1841 | rth = rcu_dereference(fnhe->fnhe_rth_input); |
94720e3a | 1842 | else |
0f457a36 | 1843 | rth = rcu_dereference(nhc->nhc_rth_input); |
e81da0e1 JA |
1844 | if (rt_cache_valid(rth)) { |
1845 | skb_dst_set_noref(skb, &rth->dst); | |
1846 | goto out; | |
d2d68ba9 DM |
1847 | } |
1848 | } | |
f2bb4bed | 1849 | |
d08c4f35 | 1850 | rth = rt_dst_alloc(out_dev->dev, 0, res->type, |
5c1e6aa3 | 1851 | IN_DEV_CONF_GET(in_dev, NOPOLICY), |
af13b3c3 | 1852 | IN_DEV_CONF_GET(out_dev, NOXFRM)); |
1da177e4 LT |
1853 | if (!rth) { |
1854 | err = -ENOBUFS; | |
1855 | goto cleanup; | |
1856 | } | |
1857 | ||
9917e1e8 | 1858 | rth->rt_is_input = 1; |
a6254864 | 1859 | RT_CACHE_STAT_INC(in_slow_tot); |
1da177e4 | 1860 | |
d8d1f30b | 1861 | rth->dst.input = ip_forward; |
1da177e4 | 1862 | |
a4c2fd7f WW |
1863 | rt_set_nexthop(rth, daddr, res, fnhe, res->fi, res->type, itag, |
1864 | do_cache); | |
9942895b | 1865 | lwtunnel_set_redirect(&rth->dst); |
c6cffba4 | 1866 | skb_dst_set(skb, &rth->dst); |
d2d68ba9 | 1867 | out: |
1da177e4 LT |
1868 | err = 0; |
1869 | cleanup: | |
1da177e4 | 1870 | return err; |
e905a9ed | 1871 | } |
1da177e4 | 1872 | |
79a13159 | 1873 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
79a13159 | 1874 | /* To make ICMP packets follow the right flow, the multipath hash is |
bf4e0a3d | 1875 | * calculated from the inner IP addresses. |
79a13159 | 1876 | */ |
bf4e0a3d NA |
1877 | static void ip_multipath_l3_keys(const struct sk_buff *skb, |
1878 | struct flow_keys *hash_keys) | |
79a13159 PN |
1879 | { |
1880 | const struct iphdr *outer_iph = ip_hdr(skb); | |
6f74b6c2 | 1881 | const struct iphdr *key_iph = outer_iph; |
bf4e0a3d | 1882 | const struct iphdr *inner_iph; |
79a13159 PN |
1883 | const struct icmphdr *icmph; |
1884 | struct iphdr _inner_iph; | |
bf4e0a3d NA |
1885 | struct icmphdr _icmph; |
1886 | ||
bf4e0a3d | 1887 | if (likely(outer_iph->protocol != IPPROTO_ICMP)) |
6f74b6c2 | 1888 | goto out; |
79a13159 PN |
1889 | |
1890 | if (unlikely((outer_iph->frag_off & htons(IP_OFFSET)) != 0)) | |
6f74b6c2 | 1891 | goto out; |
79a13159 PN |
1892 | |
1893 | icmph = skb_header_pointer(skb, outer_iph->ihl * 4, sizeof(_icmph), | |
1894 | &_icmph); | |
1895 | if (!icmph) | |
6f74b6c2 | 1896 | goto out; |
79a13159 | 1897 | |
54074f1d | 1898 | if (!icmp_is_err(icmph->type)) |
6f74b6c2 | 1899 | goto out; |
79a13159 PN |
1900 | |
1901 | inner_iph = skb_header_pointer(skb, | |
1902 | outer_iph->ihl * 4 + sizeof(_icmph), | |
1903 | sizeof(_inner_iph), &_inner_iph); | |
1904 | if (!inner_iph) | |
6f74b6c2 DA |
1905 | goto out; |
1906 | ||
1907 | key_iph = inner_iph; | |
1908 | out: | |
1909 | hash_keys->addrs.v4addrs.src = key_iph->saddr; | |
1910 | hash_keys->addrs.v4addrs.dst = key_iph->daddr; | |
bf4e0a3d | 1911 | } |
79a13159 | 1912 | |
bf4e0a3d | 1913 | /* if skb is set it will be used and fl4 can be NULL */ |
7efc0b6b | 1914 | int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4, |
e37b1e97 | 1915 | const struct sk_buff *skb, struct flow_keys *flkeys) |
bf4e0a3d | 1916 | { |
2a8e4997 | 1917 | u32 multipath_hash = fl4 ? fl4->flowi4_multipath_hash : 0; |
bf4e0a3d NA |
1918 | struct flow_keys hash_keys; |
1919 | u32 mhash; | |
79a13159 | 1920 | |
bf4e0a3d NA |
1921 | switch (net->ipv4.sysctl_fib_multipath_hash_policy) { |
1922 | case 0: | |
1923 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
1924 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
1925 | if (skb) { | |
1926 | ip_multipath_l3_keys(skb, &hash_keys); | |
1927 | } else { | |
1928 | hash_keys.addrs.v4addrs.src = fl4->saddr; | |
1929 | hash_keys.addrs.v4addrs.dst = fl4->daddr; | |
1930 | } | |
1931 | break; | |
1932 | case 1: | |
1933 | /* skb is currently provided only when forwarding */ | |
1934 | if (skb) { | |
1935 | unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; | |
1936 | struct flow_keys keys; | |
1937 | ||
1938 | /* short-circuit if we already have L4 hash present */ | |
1939 | if (skb->l4_hash) | |
1940 | return skb_get_hash_raw(skb) >> 1; | |
ec7127a5 | 1941 | |
bf4e0a3d | 1942 | memset(&hash_keys, 0, sizeof(hash_keys)); |
1fe4b118 | 1943 | |
ec7127a5 | 1944 | if (!flkeys) { |
e37b1e97 | 1945 | skb_flow_dissect_flow_keys(skb, &keys, flag); |
ec7127a5 | 1946 | flkeys = &keys; |
e37b1e97 | 1947 | } |
ec7127a5 DA |
1948 | |
1949 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
1950 | hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src; | |
1951 | hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst; | |
1952 | hash_keys.ports.src = flkeys->ports.src; | |
1953 | hash_keys.ports.dst = flkeys->ports.dst; | |
1954 | hash_keys.basic.ip_proto = flkeys->basic.ip_proto; | |
bf4e0a3d NA |
1955 | } else { |
1956 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
1957 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
1958 | hash_keys.addrs.v4addrs.src = fl4->saddr; | |
1959 | hash_keys.addrs.v4addrs.dst = fl4->daddr; | |
1960 | hash_keys.ports.src = fl4->fl4_sport; | |
1961 | hash_keys.ports.dst = fl4->fl4_dport; | |
1962 | hash_keys.basic.ip_proto = fl4->flowi4_proto; | |
1963 | } | |
1964 | break; | |
363887a2 SS |
1965 | case 2: |
1966 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
363887a2 SS |
1967 | /* skb is currently provided only when forwarding */ |
1968 | if (skb) { | |
1969 | struct flow_keys keys; | |
1970 | ||
1971 | skb_flow_dissect_flow_keys(skb, &keys, 0); | |
828b2b44 SS |
1972 | /* Inner can be v4 or v6 */ |
1973 | if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) { | |
1974 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
1975 | hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src; | |
1976 | hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst; | |
1977 | } else if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) { | |
1978 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
1979 | hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src; | |
1980 | hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst; | |
1981 | hash_keys.tags.flow_label = keys.tags.flow_label; | |
1982 | hash_keys.basic.ip_proto = keys.basic.ip_proto; | |
1983 | } else { | |
1984 | /* Same as case 0 */ | |
1985 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
1986 | ip_multipath_l3_keys(skb, &hash_keys); | |
1987 | } | |
363887a2 SS |
1988 | } else { |
1989 | /* Same as case 0 */ | |
828b2b44 | 1990 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; |
363887a2 SS |
1991 | hash_keys.addrs.v4addrs.src = fl4->saddr; |
1992 | hash_keys.addrs.v4addrs.dst = fl4->daddr; | |
1993 | } | |
1994 | break; | |
bf4e0a3d NA |
1995 | } |
1996 | mhash = flow_hash_from_keys(&hash_keys); | |
79a13159 | 1997 | |
24ba1440 | 1998 | if (multipath_hash) |
1999 | mhash = jhash_2words(mhash, multipath_hash, 0); | |
2000 | ||
bf4e0a3d NA |
2001 | return mhash >> 1; |
2002 | } | |
79a13159 PN |
2003 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ |
2004 | ||
5969f71d SH |
2005 | static int ip_mkroute_input(struct sk_buff *skb, |
2006 | struct fib_result *res, | |
5969f71d | 2007 | struct in_device *in_dev, |
e37b1e97 RP |
2008 | __be32 daddr, __be32 saddr, u32 tos, |
2009 | struct flow_keys *hkeys) | |
1da177e4 | 2010 | { |
1da177e4 | 2011 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
5481d73f | 2012 | if (res->fi && fib_info_num_path(res->fi) > 1) { |
7efc0b6b | 2013 | int h = fib_multipath_hash(res->fi->fib_net, NULL, skb, hkeys); |
0e884c78 | 2014 | |
0e884c78 PN |
2015 | fib_select_multipath(res, h); |
2016 | } | |
1da177e4 LT |
2017 | #endif |
2018 | ||
2019 | /* create a routing cache entry */ | |
c6cffba4 | 2020 | return __mkroute_input(skb, res, in_dev, daddr, saddr, tos); |
1da177e4 LT |
2021 | } |
2022 | ||
02b24941 PA |
2023 | /* Implements all the saddr-related checks as ip_route_input_slow(), |
2024 | * assuming daddr is valid and the destination is not a local broadcast one. | |
2025 | * Uses the provided hint instead of performing a route lookup. | |
2026 | */ | |
2027 | int ip_route_use_hint(struct sk_buff *skb, __be32 daddr, __be32 saddr, | |
2028 | u8 tos, struct net_device *dev, | |
2029 | const struct sk_buff *hint) | |
2030 | { | |
2031 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
2032 | struct rtable *rt = (struct rtable *)hint; | |
2033 | struct net *net = dev_net(dev); | |
2034 | int err = -EINVAL; | |
2035 | u32 tag = 0; | |
2036 | ||
2037 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) | |
2038 | goto martian_source; | |
2039 | ||
2040 | if (ipv4_is_zeronet(saddr)) | |
2041 | goto martian_source; | |
2042 | ||
2043 | if (ipv4_is_loopback(saddr) && !IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) | |
2044 | goto martian_source; | |
2045 | ||
2046 | if (rt->rt_type != RTN_LOCAL) | |
2047 | goto skip_validate_source; | |
2048 | ||
2049 | tos &= IPTOS_RT_MASK; | |
2050 | err = fib_validate_source(skb, saddr, daddr, tos, 0, dev, in_dev, &tag); | |
2051 | if (err < 0) | |
2052 | goto martian_source; | |
2053 | ||
2054 | skip_validate_source: | |
2055 | skb_dst_copy(skb, hint); | |
2056 | return 0; | |
2057 | ||
2058 | martian_source: | |
2059 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); | |
2060 | return err; | |
2061 | } | |
2062 | ||
1da177e4 LT |
2063 | /* |
2064 | * NOTE. We drop all the packets that has local source | |
2065 | * addresses, because every properly looped back packet | |
2066 | * must have correct destination already attached by output routine. | |
02b24941 PA |
2067 | * Changes in the enforced policies must be applied also to |
2068 | * ip_route_use_hint(). | |
1da177e4 LT |
2069 | * |
2070 | * Such approach solves two big problems: | |
2071 | * 1. Not simplex devices are handled properly. | |
2072 | * 2. IP spoofing attempts are filtered with 100% of guarantee. | |
ebc0ffae | 2073 | * called with rcu_read_lock() |
1da177e4 LT |
2074 | */ |
2075 | ||
9e12bb22 | 2076 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
5510cdf7 DA |
2077 | u8 tos, struct net_device *dev, |
2078 | struct fib_result *res) | |
1da177e4 | 2079 | { |
96d36220 | 2080 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
e37b1e97 RP |
2081 | struct flow_keys *flkeys = NULL, _flkeys; |
2082 | struct net *net = dev_net(dev); | |
1b7179d3 | 2083 | struct ip_tunnel_info *tun_info; |
e37b1e97 | 2084 | int err = -EINVAL; |
95c96174 | 2085 | unsigned int flags = 0; |
1da177e4 | 2086 | u32 itag = 0; |
95c96174 | 2087 | struct rtable *rth; |
e37b1e97 | 2088 | struct flowi4 fl4; |
0a90478b | 2089 | bool do_cache = true; |
1da177e4 LT |
2090 | |
2091 | /* IP on this device is disabled. */ | |
2092 | ||
2093 | if (!in_dev) | |
2094 | goto out; | |
2095 | ||
2096 | /* Check for the most weird martians, which can be not detected | |
2097 | by fib_lookup. | |
2098 | */ | |
2099 | ||
61adedf3 | 2100 | tun_info = skb_tunnel_info(skb); |
46fa062a | 2101 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
1b7179d3 TG |
2102 | fl4.flowi4_tun_key.tun_id = tun_info->key.tun_id; |
2103 | else | |
2104 | fl4.flowi4_tun_key.tun_id = 0; | |
f38a9eb1 TG |
2105 | skb_dst_drop(skb); |
2106 | ||
d0daebc3 | 2107 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) |
1da177e4 LT |
2108 | goto martian_source; |
2109 | ||
5510cdf7 DA |
2110 | res->fi = NULL; |
2111 | res->table = NULL; | |
27a954bd | 2112 | if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0)) |
1da177e4 LT |
2113 | goto brd_input; |
2114 | ||
2115 | /* Accept zero addresses only to limited broadcast; | |
2116 | * I even do not know to fix it or not. Waiting for complains :-) | |
2117 | */ | |
f97c1e0c | 2118 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
2119 | goto martian_source; |
2120 | ||
d0daebc3 | 2121 | if (ipv4_is_zeronet(daddr)) |
1da177e4 LT |
2122 | goto martian_destination; |
2123 | ||
9eb43e76 ED |
2124 | /* Following code try to avoid calling IN_DEV_NET_ROUTE_LOCALNET(), |
2125 | * and call it once if daddr or/and saddr are loopback addresses | |
2126 | */ | |
2127 | if (ipv4_is_loopback(daddr)) { | |
2128 | if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) | |
d0daebc3 | 2129 | goto martian_destination; |
9eb43e76 ED |
2130 | } else if (ipv4_is_loopback(saddr)) { |
2131 | if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) | |
d0daebc3 TG |
2132 | goto martian_source; |
2133 | } | |
2134 | ||
1da177e4 LT |
2135 | /* |
2136 | * Now we are ready to route packet. | |
2137 | */ | |
68a5e3dd | 2138 | fl4.flowi4_oif = 0; |
e0d56fdd | 2139 | fl4.flowi4_iif = dev->ifindex; |
68a5e3dd DM |
2140 | fl4.flowi4_mark = skb->mark; |
2141 | fl4.flowi4_tos = tos; | |
2142 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
b84f7878 | 2143 | fl4.flowi4_flags = 0; |
68a5e3dd DM |
2144 | fl4.daddr = daddr; |
2145 | fl4.saddr = saddr; | |
8bcfd092 | 2146 | fl4.flowi4_uid = sock_net_uid(net, NULL); |
e37b1e97 | 2147 | |
5a847a6e | 2148 | if (fib4_rules_early_flow_dissect(net, skb, &fl4, &_flkeys)) { |
e37b1e97 | 2149 | flkeys = &_flkeys; |
5a847a6e DA |
2150 | } else { |
2151 | fl4.flowi4_proto = 0; | |
2152 | fl4.fl4_sport = 0; | |
2153 | fl4.fl4_dport = 0; | |
2154 | } | |
e37b1e97 | 2155 | |
5510cdf7 | 2156 | err = fib_lookup(net, &fl4, res, 0); |
cd0f0b95 DJ |
2157 | if (err != 0) { |
2158 | if (!IN_DEV_FORWARD(in_dev)) | |
2159 | err = -EHOSTUNREACH; | |
1da177e4 | 2160 | goto no_route; |
cd0f0b95 | 2161 | } |
1da177e4 | 2162 | |
5cbf777c XL |
2163 | if (res->type == RTN_BROADCAST) { |
2164 | if (IN_DEV_BFORWARD(in_dev)) | |
2165 | goto make_route; | |
0a90478b XL |
2166 | /* not do cache if bc_forwarding is enabled */ |
2167 | if (IPV4_DEVCONF_ALL(net, BC_FORWARDING)) | |
2168 | do_cache = false; | |
1da177e4 | 2169 | goto brd_input; |
5cbf777c | 2170 | } |
1da177e4 | 2171 | |
5510cdf7 | 2172 | if (res->type == RTN_LOCAL) { |
5c04c819 | 2173 | err = fib_validate_source(skb, saddr, daddr, tos, |
0d5edc68 | 2174 | 0, dev, in_dev, &itag); |
b5f7e755 | 2175 | if (err < 0) |
0d753960 | 2176 | goto martian_source; |
1da177e4 LT |
2177 | goto local_input; |
2178 | } | |
2179 | ||
cd0f0b95 DJ |
2180 | if (!IN_DEV_FORWARD(in_dev)) { |
2181 | err = -EHOSTUNREACH; | |
251da413 | 2182 | goto no_route; |
cd0f0b95 | 2183 | } |
5510cdf7 | 2184 | if (res->type != RTN_UNICAST) |
1da177e4 LT |
2185 | goto martian_destination; |
2186 | ||
5cbf777c | 2187 | make_route: |
e37b1e97 | 2188 | err = ip_mkroute_input(skb, res, in_dev, daddr, saddr, tos, flkeys); |
1da177e4 LT |
2189 | out: return err; |
2190 | ||
2191 | brd_input: | |
2192 | if (skb->protocol != htons(ETH_P_IP)) | |
2193 | goto e_inval; | |
2194 | ||
41347dcd | 2195 | if (!ipv4_is_zeronet(saddr)) { |
9e56e380 DM |
2196 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
2197 | in_dev, &itag); | |
1da177e4 | 2198 | if (err < 0) |
0d753960 | 2199 | goto martian_source; |
1da177e4 LT |
2200 | } |
2201 | flags |= RTCF_BROADCAST; | |
5510cdf7 | 2202 | res->type = RTN_BROADCAST; |
1da177e4 LT |
2203 | RT_CACHE_STAT_INC(in_brd); |
2204 | ||
2205 | local_input: | |
0a90478b XL |
2206 | do_cache &= res->fi && !itag; |
2207 | if (do_cache) { | |
2208 | struct fib_nh_common *nhc = FIB_RES_NHC(*res); | |
eba618ab | 2209 | |
0a90478b XL |
2210 | rth = rcu_dereference(nhc->nhc_rth_input); |
2211 | if (rt_cache_valid(rth)) { | |
2212 | skb_dst_set_noref(skb, &rth->dst); | |
2213 | err = 0; | |
2214 | goto out; | |
d2d68ba9 DM |
2215 | } |
2216 | } | |
2217 | ||
f5a0aab8 | 2218 | rth = rt_dst_alloc(l3mdev_master_dev_rcu(dev) ? : net->loopback_dev, |
5510cdf7 | 2219 | flags | RTCF_LOCAL, res->type, |
af13b3c3 | 2220 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false); |
1da177e4 LT |
2221 | if (!rth) |
2222 | goto e_nobufs; | |
2223 | ||
d8d1f30b | 2224 | rth->dst.output= ip_rt_bug; |
cf911662 DM |
2225 | #ifdef CONFIG_IP_ROUTE_CLASSID |
2226 | rth->dst.tclassid = itag; | |
2227 | #endif | |
9917e1e8 | 2228 | rth->rt_is_input = 1; |
571e7226 | 2229 | |
a6254864 | 2230 | RT_CACHE_STAT_INC(in_slow_tot); |
5510cdf7 | 2231 | if (res->type == RTN_UNREACHABLE) { |
d8d1f30b CG |
2232 | rth->dst.input= ip_error; |
2233 | rth->dst.error= -err; | |
1da177e4 LT |
2234 | rth->rt_flags &= ~RTCF_LOCAL; |
2235 | } | |
efd85700 | 2236 | |
dcdfdf56 | 2237 | if (do_cache) { |
eba618ab | 2238 | struct fib_nh_common *nhc = FIB_RES_NHC(*res); |
efd85700 | 2239 | |
eba618ab | 2240 | rth->dst.lwtstate = lwtstate_get(nhc->nhc_lwtstate); |
efd85700 TG |
2241 | if (lwtunnel_input_redirect(rth->dst.lwtstate)) { |
2242 | WARN_ON(rth->dst.input == lwtunnel_input); | |
2243 | rth->dst.lwtstate->orig_input = rth->dst.input; | |
2244 | rth->dst.input = lwtunnel_input; | |
2245 | } | |
2246 | ||
87063a1f | 2247 | if (unlikely(!rt_cache_route(nhc, rth))) |
dcdfdf56 | 2248 | rt_add_uncached_list(rth); |
dcdfdf56 | 2249 | } |
89aef892 | 2250 | skb_dst_set(skb, &rth->dst); |
b23dd4fe | 2251 | err = 0; |
ebc0ffae | 2252 | goto out; |
1da177e4 LT |
2253 | |
2254 | no_route: | |
2255 | RT_CACHE_STAT_INC(in_no_route); | |
5510cdf7 DA |
2256 | res->type = RTN_UNREACHABLE; |
2257 | res->fi = NULL; | |
2258 | res->table = NULL; | |
1da177e4 LT |
2259 | goto local_input; |
2260 | ||
2261 | /* | |
2262 | * Do not cache martian addresses: they should be logged (RFC1812) | |
2263 | */ | |
2264 | martian_destination: | |
2265 | RT_CACHE_STAT_INC(in_martian_dst); | |
2266 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
e87cc472 JP |
2267 | if (IN_DEV_LOG_MARTIANS(in_dev)) |
2268 | net_warn_ratelimited("martian destination %pI4 from %pI4, dev %s\n", | |
2269 | &daddr, &saddr, dev->name); | |
1da177e4 | 2270 | #endif |
2c2910a4 | 2271 | |
1da177e4 LT |
2272 | e_inval: |
2273 | err = -EINVAL; | |
ebc0ffae | 2274 | goto out; |
1da177e4 LT |
2275 | |
2276 | e_nobufs: | |
2277 | err = -ENOBUFS; | |
ebc0ffae | 2278 | goto out; |
1da177e4 LT |
2279 | |
2280 | martian_source: | |
2281 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); | |
ebc0ffae | 2282 | goto out; |
1da177e4 LT |
2283 | } |
2284 | ||
c6cffba4 DM |
2285 | int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
2286 | u8 tos, struct net_device *dev) | |
1da177e4 | 2287 | { |
5510cdf7 DA |
2288 | struct fib_result res; |
2289 | int err; | |
1da177e4 | 2290 | |
6e28099d | 2291 | tos &= IPTOS_RT_MASK; |
96d36220 | 2292 | rcu_read_lock(); |
5510cdf7 DA |
2293 | err = ip_route_input_rcu(skb, daddr, saddr, tos, dev, &res); |
2294 | rcu_read_unlock(); | |
96d36220 | 2295 | |
5510cdf7 DA |
2296 | return err; |
2297 | } | |
2298 | EXPORT_SYMBOL(ip_route_input_noref); | |
2299 | ||
2300 | /* called with rcu_read_lock held */ | |
2301 | int ip_route_input_rcu(struct sk_buff *skb, __be32 daddr, __be32 saddr, | |
2302 | u8 tos, struct net_device *dev, struct fib_result *res) | |
2303 | { | |
1da177e4 LT |
2304 | /* Multicast recognition logic is moved from route cache to here. |
2305 | The problem was that too many Ethernet cards have broken/missing | |
2306 | hardware multicast filters :-( As result the host on multicasting | |
2307 | network acquires a lot of useless route cache entries, sort of | |
2308 | SDR messages from all the world. Now we try to get rid of them. | |
2309 | Really, provided software IP multicast filter is organized | |
2310 | reasonably (at least, hashed), it does not result in a slowdown | |
2311 | comparing with route cache reject entries. | |
2312 | Note, that multicast routers are not affected, because | |
2313 | route cache entry is created eventually. | |
2314 | */ | |
f97c1e0c | 2315 | if (ipv4_is_multicast(daddr)) { |
96d36220 | 2316 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
e58e4159 | 2317 | int our = 0; |
5510cdf7 | 2318 | int err = -EINVAL; |
1da177e4 | 2319 | |
22c74764 PA |
2320 | if (!in_dev) |
2321 | return err; | |
2322 | our = ip_check_mc_rcu(in_dev, daddr, saddr, | |
2323 | ip_hdr(skb)->protocol); | |
e58e4159 DA |
2324 | |
2325 | /* check l3 master if no match yet */ | |
22c74764 | 2326 | if (!our && netif_is_l3_slave(dev)) { |
e58e4159 DA |
2327 | struct in_device *l3_in_dev; |
2328 | ||
2329 | l3_in_dev = __in_dev_get_rcu(skb->dev); | |
2330 | if (l3_in_dev) | |
2331 | our = ip_check_mc_rcu(l3_in_dev, daddr, saddr, | |
2332 | ip_hdr(skb)->protocol); | |
2333 | } | |
2334 | ||
e58e4159 | 2335 | if (our |
1da177e4 | 2336 | #ifdef CONFIG_IP_MROUTE |
e58e4159 DA |
2337 | || |
2338 | (!ipv4_is_local_multicast(daddr) && | |
2339 | IN_DEV_MFORWARD(in_dev)) | |
1da177e4 | 2340 | #endif |
e58e4159 | 2341 | ) { |
5510cdf7 | 2342 | err = ip_route_input_mc(skb, daddr, saddr, |
e58e4159 | 2343 | tos, dev, our); |
1da177e4 | 2344 | } |
5510cdf7 | 2345 | return err; |
1da177e4 | 2346 | } |
5510cdf7 DA |
2347 | |
2348 | return ip_route_input_slow(skb, daddr, saddr, tos, dev, res); | |
1da177e4 LT |
2349 | } |
2350 | ||
ebc0ffae | 2351 | /* called with rcu_read_lock() */ |
982721f3 | 2352 | static struct rtable *__mkroute_output(const struct fib_result *res, |
1a00fee4 | 2353 | const struct flowi4 *fl4, int orig_oif, |
f61759e6 | 2354 | struct net_device *dev_out, |
5ada5527 | 2355 | unsigned int flags) |
1da177e4 | 2356 | { |
982721f3 | 2357 | struct fib_info *fi = res->fi; |
f2bb4bed | 2358 | struct fib_nh_exception *fnhe; |
5ada5527 | 2359 | struct in_device *in_dev; |
982721f3 | 2360 | u16 type = res->type; |
5ada5527 | 2361 | struct rtable *rth; |
c92b9655 | 2362 | bool do_cache; |
1da177e4 | 2363 | |
d0daebc3 TG |
2364 | in_dev = __in_dev_get_rcu(dev_out); |
2365 | if (!in_dev) | |
5ada5527 | 2366 | return ERR_PTR(-EINVAL); |
1da177e4 | 2367 | |
d0daebc3 | 2368 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) |
5f02ce24 DA |
2369 | if (ipv4_is_loopback(fl4->saddr) && |
2370 | !(dev_out->flags & IFF_LOOPBACK) && | |
2371 | !netif_is_l3_master(dev_out)) | |
d0daebc3 TG |
2372 | return ERR_PTR(-EINVAL); |
2373 | ||
68a5e3dd | 2374 | if (ipv4_is_lbcast(fl4->daddr)) |
982721f3 | 2375 | type = RTN_BROADCAST; |
68a5e3dd | 2376 | else if (ipv4_is_multicast(fl4->daddr)) |
982721f3 | 2377 | type = RTN_MULTICAST; |
68a5e3dd | 2378 | else if (ipv4_is_zeronet(fl4->daddr)) |
5ada5527 | 2379 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
2380 | |
2381 | if (dev_out->flags & IFF_LOOPBACK) | |
2382 | flags |= RTCF_LOCAL; | |
2383 | ||
63617421 | 2384 | do_cache = true; |
982721f3 | 2385 | if (type == RTN_BROADCAST) { |
1da177e4 | 2386 | flags |= RTCF_BROADCAST | RTCF_LOCAL; |
982721f3 DM |
2387 | fi = NULL; |
2388 | } else if (type == RTN_MULTICAST) { | |
dd28d1a0 | 2389 | flags |= RTCF_MULTICAST | RTCF_LOCAL; |
813b3b5d DM |
2390 | if (!ip_check_mc_rcu(in_dev, fl4->daddr, fl4->saddr, |
2391 | fl4->flowi4_proto)) | |
1da177e4 | 2392 | flags &= ~RTCF_LOCAL; |
63617421 JA |
2393 | else |
2394 | do_cache = false; | |
1da177e4 | 2395 | /* If multicast route do not exist use |
dd28d1a0 ED |
2396 | * default one, but do not gateway in this case. |
2397 | * Yes, it is hack. | |
1da177e4 | 2398 | */ |
982721f3 DM |
2399 | if (fi && res->prefixlen < 4) |
2400 | fi = NULL; | |
d6d5e999 CF |
2401 | } else if ((type == RTN_LOCAL) && (orig_oif != 0) && |
2402 | (orig_oif != dev_out->ifindex)) { | |
2403 | /* For local routes that require a particular output interface | |
2404 | * we do not want to cache the result. Caching the result | |
2405 | * causes incorrect behaviour when there are multiple source | |
2406 | * addresses on the interface, the end result being that if the | |
2407 | * intended recipient is waiting on that interface for the | |
2408 | * packet he won't receive it because it will be delivered on | |
2409 | * the loopback interface and the IP_PKTINFO ipi_ifindex will | |
2410 | * be set to the loopback interface as well. | |
2411 | */ | |
94720e3a | 2412 | do_cache = false; |
1da177e4 LT |
2413 | } |
2414 | ||
f2bb4bed | 2415 | fnhe = NULL; |
63617421 | 2416 | do_cache &= fi != NULL; |
94720e3a | 2417 | if (fi) { |
eba618ab | 2418 | struct fib_nh_common *nhc = FIB_RES_NHC(*res); |
c5038a83 | 2419 | struct rtable __rcu **prth; |
d26b3a7c | 2420 | |
a5995e71 | 2421 | fnhe = find_exception(nhc, fl4->daddr); |
94720e3a JA |
2422 | if (!do_cache) |
2423 | goto add; | |
deed49df | 2424 | if (fnhe) { |
2ffae99d | 2425 | prth = &fnhe->fnhe_rth_output; |
94720e3a JA |
2426 | } else { |
2427 | if (unlikely(fl4->flowi4_flags & | |
2428 | FLOWI_FLAG_KNOWN_NH && | |
bdf00467 | 2429 | !(nhc->nhc_gw_family && |
eba618ab | 2430 | nhc->nhc_scope == RT_SCOPE_LINK))) { |
94720e3a JA |
2431 | do_cache = false; |
2432 | goto add; | |
c92b9655 | 2433 | } |
0f457a36 | 2434 | prth = raw_cpu_ptr(nhc->nhc_pcpu_rth_output); |
c92b9655 | 2435 | } |
c5038a83 | 2436 | rth = rcu_dereference(*prth); |
9df16efa | 2437 | if (rt_cache_valid(rth) && dst_hold_safe(&rth->dst)) |
c5038a83 | 2438 | return rth; |
f2bb4bed | 2439 | } |
c92b9655 JA |
2440 | |
2441 | add: | |
d08c4f35 | 2442 | rth = rt_dst_alloc(dev_out, flags, type, |
5c1e6aa3 | 2443 | IN_DEV_CONF_GET(in_dev, NOPOLICY), |
af13b3c3 | 2444 | IN_DEV_CONF_GET(in_dev, NOXFRM)); |
8391d07b | 2445 | if (!rth) |
5ada5527 | 2446 | return ERR_PTR(-ENOBUFS); |
8391d07b | 2447 | |
9438c871 | 2448 | rth->rt_iif = orig_oif; |
b7503e0c | 2449 | |
1da177e4 LT |
2450 | RT_CACHE_STAT_INC(out_slow_tot); |
2451 | ||
1da177e4 | 2452 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { |
e905a9ed | 2453 | if (flags & RTCF_LOCAL && |
1da177e4 | 2454 | !(dev_out->flags & IFF_LOOPBACK)) { |
d8d1f30b | 2455 | rth->dst.output = ip_mc_output; |
1da177e4 LT |
2456 | RT_CACHE_STAT_INC(out_slow_mc); |
2457 | } | |
2458 | #ifdef CONFIG_IP_MROUTE | |
982721f3 | 2459 | if (type == RTN_MULTICAST) { |
1da177e4 | 2460 | if (IN_DEV_MFORWARD(in_dev) && |
813b3b5d | 2461 | !ipv4_is_local_multicast(fl4->daddr)) { |
d8d1f30b CG |
2462 | rth->dst.input = ip_mr_input; |
2463 | rth->dst.output = ip_mc_output; | |
1da177e4 LT |
2464 | } |
2465 | } | |
2466 | #endif | |
2467 | } | |
2468 | ||
a4c2fd7f | 2469 | rt_set_nexthop(rth, fl4->daddr, res, fnhe, fi, type, 0, do_cache); |
9942895b | 2470 | lwtunnel_set_redirect(&rth->dst); |
1da177e4 | 2471 | |
5ada5527 | 2472 | return rth; |
1da177e4 LT |
2473 | } |
2474 | ||
1da177e4 LT |
2475 | /* |
2476 | * Major route resolver routine. | |
2477 | */ | |
2478 | ||
3abd1ade DA |
2479 | struct rtable *ip_route_output_key_hash(struct net *net, struct flowi4 *fl4, |
2480 | const struct sk_buff *skb) | |
1da177e4 | 2481 | { |
f61759e6 | 2482 | __u8 tos = RT_FL_TOS(fl4); |
d0ea2b12 ED |
2483 | struct fib_result res = { |
2484 | .type = RTN_UNSPEC, | |
2485 | .fi = NULL, | |
2486 | .table = NULL, | |
2487 | .tclassid = 0, | |
2488 | }; | |
5ada5527 | 2489 | struct rtable *rth; |
1da177e4 | 2490 | |
1fb9489b | 2491 | fl4->flowi4_iif = LOOPBACK_IFINDEX; |
813b3b5d DM |
2492 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; |
2493 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
2494 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
44713b67 | 2495 | |
010c2708 | 2496 | rcu_read_lock(); |
3abd1ade DA |
2497 | rth = ip_route_output_key_hash_rcu(net, fl4, &res, skb); |
2498 | rcu_read_unlock(); | |
2499 | ||
2500 | return rth; | |
2501 | } | |
2502 | EXPORT_SYMBOL_GPL(ip_route_output_key_hash); | |
2503 | ||
2504 | struct rtable *ip_route_output_key_hash_rcu(struct net *net, struct flowi4 *fl4, | |
2505 | struct fib_result *res, | |
2506 | const struct sk_buff *skb) | |
2507 | { | |
2508 | struct net_device *dev_out = NULL; | |
2509 | int orig_oif = fl4->flowi4_oif; | |
2510 | unsigned int flags = 0; | |
2511 | struct rtable *rth; | |
595e0651 | 2512 | int err; |
3abd1ade | 2513 | |
813b3b5d | 2514 | if (fl4->saddr) { |
813b3b5d DM |
2515 | if (ipv4_is_multicast(fl4->saddr) || |
2516 | ipv4_is_lbcast(fl4->saddr) || | |
595e0651 SB |
2517 | ipv4_is_zeronet(fl4->saddr)) { |
2518 | rth = ERR_PTR(-EINVAL); | |
1da177e4 | 2519 | goto out; |
595e0651 SB |
2520 | } |
2521 | ||
2522 | rth = ERR_PTR(-ENETUNREACH); | |
1da177e4 | 2523 | |
1da177e4 LT |
2524 | /* I removed check for oif == dev_out->oif here. |
2525 | It was wrong for two reasons: | |
1ab35276 DL |
2526 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
2527 | is assigned to multiple interfaces. | |
1da177e4 LT |
2528 | 2. Moreover, we are allowed to send packets with saddr |
2529 | of another iface. --ANK | |
2530 | */ | |
2531 | ||
813b3b5d DM |
2532 | if (fl4->flowi4_oif == 0 && |
2533 | (ipv4_is_multicast(fl4->daddr) || | |
2534 | ipv4_is_lbcast(fl4->daddr))) { | |
a210d01a | 2535 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 2536 | dev_out = __ip_dev_find(net, fl4->saddr, false); |
51456b29 | 2537 | if (!dev_out) |
a210d01a JA |
2538 | goto out; |
2539 | ||
1da177e4 LT |
2540 | /* Special hack: user can direct multicasts |
2541 | and limited broadcast via necessary interface | |
2542 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. | |
2543 | This hack is not just for fun, it allows | |
2544 | vic,vat and friends to work. | |
2545 | They bind socket to loopback, set ttl to zero | |
2546 | and expect that it will work. | |
2547 | From the viewpoint of routing cache they are broken, | |
2548 | because we are not allowed to build multicast path | |
2549 | with loopback source addr (look, routing cache | |
2550 | cannot know, that ttl is zero, so that packet | |
2551 | will not leave this host and route is valid). | |
2552 | Luckily, this hack is good workaround. | |
2553 | */ | |
2554 | ||
813b3b5d | 2555 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2556 | goto make_route; |
2557 | } | |
a210d01a | 2558 | |
813b3b5d | 2559 | if (!(fl4->flowi4_flags & FLOWI_FLAG_ANYSRC)) { |
a210d01a | 2560 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 2561 | if (!__ip_dev_find(net, fl4->saddr, false)) |
a210d01a | 2562 | goto out; |
a210d01a | 2563 | } |
1da177e4 LT |
2564 | } |
2565 | ||
2566 | ||
813b3b5d DM |
2567 | if (fl4->flowi4_oif) { |
2568 | dev_out = dev_get_by_index_rcu(net, fl4->flowi4_oif); | |
b23dd4fe | 2569 | rth = ERR_PTR(-ENODEV); |
51456b29 | 2570 | if (!dev_out) |
1da177e4 | 2571 | goto out; |
e5ed6399 HX |
2572 | |
2573 | /* RACE: Check return value of inet_select_addr instead. */ | |
fc75fc83 | 2574 | if (!(dev_out->flags & IFF_UP) || !__in_dev_get_rcu(dev_out)) { |
b23dd4fe | 2575 | rth = ERR_PTR(-ENETUNREACH); |
fc75fc83 ED |
2576 | goto out; |
2577 | } | |
813b3b5d | 2578 | if (ipv4_is_local_multicast(fl4->daddr) || |
6a211654 AL |
2579 | ipv4_is_lbcast(fl4->daddr) || |
2580 | fl4->flowi4_proto == IPPROTO_IGMP) { | |
813b3b5d DM |
2581 | if (!fl4->saddr) |
2582 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2583 | RT_SCOPE_LINK); | |
1da177e4 LT |
2584 | goto make_route; |
2585 | } | |
0a7e2260 | 2586 | if (!fl4->saddr) { |
813b3b5d DM |
2587 | if (ipv4_is_multicast(fl4->daddr)) |
2588 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2589 | fl4->flowi4_scope); | |
2590 | else if (!fl4->daddr) | |
2591 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2592 | RT_SCOPE_HOST); | |
1da177e4 LT |
2593 | } |
2594 | } | |
2595 | ||
813b3b5d DM |
2596 | if (!fl4->daddr) { |
2597 | fl4->daddr = fl4->saddr; | |
2598 | if (!fl4->daddr) | |
2599 | fl4->daddr = fl4->saddr = htonl(INADDR_LOOPBACK); | |
b40afd0e | 2600 | dev_out = net->loopback_dev; |
1fb9489b | 2601 | fl4->flowi4_oif = LOOPBACK_IFINDEX; |
3abd1ade | 2602 | res->type = RTN_LOCAL; |
1da177e4 LT |
2603 | flags |= RTCF_LOCAL; |
2604 | goto make_route; | |
2605 | } | |
2606 | ||
3abd1ade | 2607 | err = fib_lookup(net, fl4, res, 0); |
0315e382 | 2608 | if (err) { |
3abd1ade DA |
2609 | res->fi = NULL; |
2610 | res->table = NULL; | |
6104e112 | 2611 | if (fl4->flowi4_oif && |
e58e4159 DA |
2612 | (ipv4_is_multicast(fl4->daddr) || |
2613 | !netif_index_is_l3_master(net, fl4->flowi4_oif))) { | |
1da177e4 LT |
2614 | /* Apparently, routing tables are wrong. Assume, |
2615 | that the destination is on link. | |
2616 | ||
2617 | WHY? DW. | |
2618 | Because we are allowed to send to iface | |
2619 | even if it has NO routes and NO assigned | |
2620 | addresses. When oif is specified, routing | |
2621 | tables are looked up with only one purpose: | |
2622 | to catch if destination is gatewayed, rather than | |
2623 | direct. Moreover, if MSG_DONTROUTE is set, | |
2624 | we send packet, ignoring both routing tables | |
2625 | and ifaddr state. --ANK | |
2626 | ||
2627 | ||
2628 | We could make it even if oif is unknown, | |
2629 | likely IPv6, but we do not. | |
2630 | */ | |
2631 | ||
813b3b5d DM |
2632 | if (fl4->saddr == 0) |
2633 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2634 | RT_SCOPE_LINK); | |
3abd1ade | 2635 | res->type = RTN_UNICAST; |
1da177e4 LT |
2636 | goto make_route; |
2637 | } | |
0315e382 | 2638 | rth = ERR_PTR(err); |
1da177e4 LT |
2639 | goto out; |
2640 | } | |
1da177e4 | 2641 | |
3abd1ade | 2642 | if (res->type == RTN_LOCAL) { |
813b3b5d | 2643 | if (!fl4->saddr) { |
3abd1ade DA |
2644 | if (res->fi->fib_prefsrc) |
2645 | fl4->saddr = res->fi->fib_prefsrc; | |
9fc3bbb4 | 2646 | else |
813b3b5d | 2647 | fl4->saddr = fl4->daddr; |
9fc3bbb4 | 2648 | } |
5f02ce24 DA |
2649 | |
2650 | /* L3 master device is the loopback for that domain */ | |
3abd1ade | 2651 | dev_out = l3mdev_master_dev_rcu(FIB_RES_DEV(*res)) ? : |
b7c8487c | 2652 | net->loopback_dev; |
839da4d9 DA |
2653 | |
2654 | /* make sure orig_oif points to fib result device even | |
2655 | * though packet rx/tx happens over loopback or l3mdev | |
2656 | */ | |
2657 | orig_oif = FIB_RES_OIF(*res); | |
2658 | ||
813b3b5d | 2659 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2660 | flags |= RTCF_LOCAL; |
2661 | goto make_route; | |
2662 | } | |
2663 | ||
3abd1ade | 2664 | fib_select_path(net, res, fl4, skb); |
1da177e4 | 2665 | |
3abd1ade | 2666 | dev_out = FIB_RES_DEV(*res); |
813b3b5d | 2667 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2668 | |
2669 | ||
2670 | make_route: | |
3abd1ade | 2671 | rth = __mkroute_output(res, fl4, orig_oif, dev_out, flags); |
1da177e4 | 2672 | |
010c2708 | 2673 | out: |
b23dd4fe | 2674 | return rth; |
1da177e4 | 2675 | } |
d8c97a94 | 2676 | |
ae2688d5 JW |
2677 | static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 cookie) |
2678 | { | |
2679 | return NULL; | |
2680 | } | |
2681 | ||
ebb762f2 | 2682 | static unsigned int ipv4_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 2683 | { |
618f9bc7 SK |
2684 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
2685 | ||
2686 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
2687 | } |
2688 | ||
6700c270 | 2689 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
2690 | struct sk_buff *skb, u32 mtu, |
2691 | bool confirm_neigh) | |
14e50e57 DM |
2692 | { |
2693 | } | |
2694 | ||
6700c270 DM |
2695 | static void ipv4_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
2696 | struct sk_buff *skb) | |
b587ee3b DM |
2697 | { |
2698 | } | |
2699 | ||
0972ddb2 HB |
2700 | static u32 *ipv4_rt_blackhole_cow_metrics(struct dst_entry *dst, |
2701 | unsigned long old) | |
2702 | { | |
2703 | return NULL; | |
2704 | } | |
2705 | ||
14e50e57 DM |
2706 | static struct dst_ops ipv4_dst_blackhole_ops = { |
2707 | .family = AF_INET, | |
ae2688d5 | 2708 | .check = ipv4_blackhole_dst_check, |
ebb762f2 | 2709 | .mtu = ipv4_blackhole_mtu, |
214f45c9 | 2710 | .default_advmss = ipv4_default_advmss, |
14e50e57 | 2711 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, |
b587ee3b | 2712 | .redirect = ipv4_rt_blackhole_redirect, |
0972ddb2 | 2713 | .cow_metrics = ipv4_rt_blackhole_cow_metrics, |
d3aaeb38 | 2714 | .neigh_lookup = ipv4_neigh_lookup, |
14e50e57 DM |
2715 | }; |
2716 | ||
2774c131 | 2717 | struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 2718 | { |
2774c131 | 2719 | struct rtable *ort = (struct rtable *) dst_orig; |
f5b0a874 | 2720 | struct rtable *rt; |
14e50e57 | 2721 | |
6c0e7284 | 2722 | rt = dst_alloc(&ipv4_dst_blackhole_ops, NULL, 1, DST_OBSOLETE_DEAD, 0); |
14e50e57 | 2723 | if (rt) { |
d8d1f30b | 2724 | struct dst_entry *new = &rt->dst; |
14e50e57 | 2725 | |
14e50e57 | 2726 | new->__use = 1; |
352e512c | 2727 | new->input = dst_discard; |
ede2059d | 2728 | new->output = dst_discard_out; |
14e50e57 | 2729 | |
1dbe3252 | 2730 | new->dev = net->loopback_dev; |
14e50e57 DM |
2731 | if (new->dev) |
2732 | dev_hold(new->dev); | |
2733 | ||
9917e1e8 | 2734 | rt->rt_is_input = ort->rt_is_input; |
5e2b61f7 | 2735 | rt->rt_iif = ort->rt_iif; |
5943634f | 2736 | rt->rt_pmtu = ort->rt_pmtu; |
d52e5a7e | 2737 | rt->rt_mtu_locked = ort->rt_mtu_locked; |
14e50e57 | 2738 | |
ca4c3fc2 | 2739 | rt->rt_genid = rt_genid_ipv4(net); |
14e50e57 DM |
2740 | rt->rt_flags = ort->rt_flags; |
2741 | rt->rt_type = ort->rt_type; | |
77d5bc7e | 2742 | rt->rt_uses_gateway = ort->rt_uses_gateway; |
1550c171 DA |
2743 | rt->rt_gw_family = ort->rt_gw_family; |
2744 | if (rt->rt_gw_family == AF_INET) | |
2745 | rt->rt_gw4 = ort->rt_gw4; | |
0f5f7d7b DA |
2746 | else if (rt->rt_gw_family == AF_INET6) |
2747 | rt->rt_gw6 = ort->rt_gw6; | |
14e50e57 | 2748 | |
caacf05e | 2749 | INIT_LIST_HEAD(&rt->rt_uncached); |
14e50e57 DM |
2750 | } |
2751 | ||
2774c131 DM |
2752 | dst_release(dst_orig); |
2753 | ||
2754 | return rt ? &rt->dst : ERR_PTR(-ENOMEM); | |
14e50e57 DM |
2755 | } |
2756 | ||
9d6ec938 | 2757 | struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4, |
6f9c9615 | 2758 | const struct sock *sk) |
1da177e4 | 2759 | { |
9d6ec938 | 2760 | struct rtable *rt = __ip_route_output_key(net, flp4); |
1da177e4 | 2761 | |
b23dd4fe DM |
2762 | if (IS_ERR(rt)) |
2763 | return rt; | |
1da177e4 | 2764 | |
56157872 | 2765 | if (flp4->flowi4_proto) |
f92ee619 SK |
2766 | rt = (struct rtable *)xfrm_lookup_route(net, &rt->dst, |
2767 | flowi4_to_flowi(flp4), | |
2768 | sk, 0); | |
1da177e4 | 2769 | |
b23dd4fe | 2770 | return rt; |
1da177e4 | 2771 | } |
d8c97a94 ACM |
2772 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
2773 | ||
571912c6 MV |
2774 | struct rtable *ip_route_output_tunnel(struct sk_buff *skb, |
2775 | struct net_device *dev, | |
2776 | struct net *net, __be32 *saddr, | |
2777 | const struct ip_tunnel_info *info, | |
2778 | u8 protocol, bool use_cache) | |
2779 | { | |
2780 | #ifdef CONFIG_DST_CACHE | |
2781 | struct dst_cache *dst_cache; | |
2782 | #endif | |
2783 | struct rtable *rt = NULL; | |
2784 | struct flowi4 fl4; | |
2785 | __u8 tos; | |
2786 | ||
2787 | #ifdef CONFIG_DST_CACHE | |
2788 | dst_cache = (struct dst_cache *)&info->dst_cache; | |
2789 | if (use_cache) { | |
2790 | rt = dst_cache_get_ip4(dst_cache, saddr); | |
2791 | if (rt) | |
2792 | return rt; | |
2793 | } | |
2794 | #endif | |
2795 | memset(&fl4, 0, sizeof(fl4)); | |
2796 | fl4.flowi4_mark = skb->mark; | |
2797 | fl4.flowi4_proto = protocol; | |
2798 | fl4.daddr = info->key.u.ipv4.dst; | |
2799 | fl4.saddr = info->key.u.ipv4.src; | |
2800 | tos = info->key.tos; | |
2801 | fl4.flowi4_tos = RT_TOS(tos); | |
2802 | ||
2803 | rt = ip_route_output_key(net, &fl4); | |
2804 | if (IS_ERR(rt)) { | |
2805 | netdev_dbg(dev, "no route to %pI4\n", &fl4.daddr); | |
2806 | return ERR_PTR(-ENETUNREACH); | |
2807 | } | |
2808 | if (rt->dst.dev == dev) { /* is this necessary? */ | |
2809 | netdev_dbg(dev, "circular route to %pI4\n", &fl4.daddr); | |
2810 | ip_rt_put(rt); | |
2811 | return ERR_PTR(-ELOOP); | |
2812 | } | |
2813 | #ifdef CONFIG_DST_CACHE | |
2814 | if (use_cache) | |
2815 | dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr); | |
2816 | #endif | |
2817 | *saddr = fl4.saddr; | |
2818 | return rt; | |
2819 | } | |
2820 | EXPORT_SYMBOL_GPL(ip_route_output_tunnel); | |
2821 | ||
3765d35e | 2822 | /* called with rcu_read_lock held */ |
404eb77e RP |
2823 | static int rt_fill_info(struct net *net, __be32 dst, __be32 src, |
2824 | struct rtable *rt, u32 table_id, struct flowi4 *fl4, | |
e93fb3e9 JF |
2825 | struct sk_buff *skb, u32 portid, u32 seq, |
2826 | unsigned int flags) | |
1da177e4 | 2827 | { |
1da177e4 | 2828 | struct rtmsg *r; |
be403ea1 | 2829 | struct nlmsghdr *nlh; |
2bc8ca40 | 2830 | unsigned long expires = 0; |
f185071d | 2831 | u32 error; |
521f5490 | 2832 | u32 metrics[RTAX_MAX]; |
be403ea1 | 2833 | |
e93fb3e9 | 2834 | nlh = nlmsg_put(skb, portid, seq, RTM_NEWROUTE, sizeof(*r), flags); |
51456b29 | 2835 | if (!nlh) |
26932566 | 2836 | return -EMSGSIZE; |
be403ea1 TG |
2837 | |
2838 | r = nlmsg_data(nlh); | |
1da177e4 LT |
2839 | r->rtm_family = AF_INET; |
2840 | r->rtm_dst_len = 32; | |
2841 | r->rtm_src_len = 0; | |
d948974c | 2842 | r->rtm_tos = fl4 ? fl4->flowi4_tos : 0; |
8a430ed5 | 2843 | r->rtm_table = table_id < 256 ? table_id : RT_TABLE_COMPAT; |
c36ba660 | 2844 | if (nla_put_u32(skb, RTA_TABLE, table_id)) |
f3756b79 | 2845 | goto nla_put_failure; |
1da177e4 LT |
2846 | r->rtm_type = rt->rt_type; |
2847 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2848 | r->rtm_protocol = RTPROT_UNSPEC; | |
2849 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
2850 | if (rt->rt_flags & RTCF_NOTIFY) | |
2851 | r->rtm_flags |= RTM_F_NOTIFY; | |
df4d9254 HFS |
2852 | if (IPCB(skb)->flags & IPSKB_DOREDIRECT) |
2853 | r->rtm_flags |= RTCF_DOREDIRECT; | |
be403ea1 | 2854 | |
930345ea | 2855 | if (nla_put_in_addr(skb, RTA_DST, dst)) |
f3756b79 | 2856 | goto nla_put_failure; |
1a00fee4 | 2857 | if (src) { |
1da177e4 | 2858 | r->rtm_src_len = 32; |
930345ea | 2859 | if (nla_put_in_addr(skb, RTA_SRC, src)) |
f3756b79 | 2860 | goto nla_put_failure; |
1da177e4 | 2861 | } |
f3756b79 DM |
2862 | if (rt->dst.dev && |
2863 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2864 | goto nla_put_failure; | |
c7066f70 | 2865 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
2866 | if (rt->dst.tclassid && |
2867 | nla_put_u32(skb, RTA_FLOW, rt->dst.tclassid)) | |
2868 | goto nla_put_failure; | |
1da177e4 | 2869 | #endif |
d948974c | 2870 | if (fl4 && !rt_is_input_route(rt) && |
d6c0a4f6 | 2871 | fl4->saddr != src) { |
930345ea | 2872 | if (nla_put_in_addr(skb, RTA_PREFSRC, fl4->saddr)) |
f3756b79 DM |
2873 | goto nla_put_failure; |
2874 | } | |
77d5bc7e DA |
2875 | if (rt->rt_uses_gateway) { |
2876 | if (rt->rt_gw_family == AF_INET && | |
2877 | nla_put_in_addr(skb, RTA_GATEWAY, rt->rt_gw4)) { | |
0f5f7d7b | 2878 | goto nla_put_failure; |
77d5bc7e DA |
2879 | } else if (rt->rt_gw_family == AF_INET6) { |
2880 | int alen = sizeof(struct in6_addr); | |
2881 | struct nlattr *nla; | |
2882 | struct rtvia *via; | |
2883 | ||
2884 | nla = nla_reserve(skb, RTA_VIA, alen + 2); | |
2885 | if (!nla) | |
2886 | goto nla_put_failure; | |
2887 | ||
2888 | via = nla_data(nla); | |
2889 | via->rtvia_family = AF_INET6; | |
2890 | memcpy(via->rtvia_addr, &rt->rt_gw6, alen); | |
2891 | } | |
0f5f7d7b | 2892 | } |
be403ea1 | 2893 | |
ee9a8f7a SK |
2894 | expires = rt->dst.expires; |
2895 | if (expires) { | |
2896 | unsigned long now = jiffies; | |
2897 | ||
2898 | if (time_before(now, expires)) | |
2899 | expires -= now; | |
2900 | else | |
2901 | expires = 0; | |
2902 | } | |
2903 | ||
521f5490 | 2904 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
ee9a8f7a | 2905 | if (rt->rt_pmtu && expires) |
521f5490 | 2906 | metrics[RTAX_MTU - 1] = rt->rt_pmtu; |
d52e5a7e SD |
2907 | if (rt->rt_mtu_locked && expires) |
2908 | metrics[RTAX_LOCK - 1] |= BIT(RTAX_MTU); | |
521f5490 | 2909 | if (rtnetlink_put_metrics(skb, metrics) < 0) |
be403ea1 TG |
2910 | goto nla_put_failure; |
2911 | ||
d948974c SB |
2912 | if (fl4) { |
2913 | if (fl4->flowi4_mark && | |
2914 | nla_put_u32(skb, RTA_MARK, fl4->flowi4_mark)) | |
2915 | goto nla_put_failure; | |
622ec2c9 | 2916 | |
d948974c SB |
2917 | if (!uid_eq(fl4->flowi4_uid, INVALID_UID) && |
2918 | nla_put_u32(skb, RTA_UID, | |
2919 | from_kuid_munged(current_user_ns(), | |
2920 | fl4->flowi4_uid))) | |
2921 | goto nla_put_failure; | |
be403ea1 | 2922 | |
d948974c | 2923 | if (rt_is_input_route(rt)) { |
8caaf7b6 | 2924 | #ifdef CONFIG_IP_MROUTE |
d948974c SB |
2925 | if (ipv4_is_multicast(dst) && |
2926 | !ipv4_is_local_multicast(dst) && | |
2927 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)) { | |
2928 | int err = ipmr_get_route(net, skb, | |
2929 | fl4->saddr, fl4->daddr, | |
2930 | r, portid); | |
2931 | ||
2932 | if (err <= 0) { | |
2933 | if (err == 0) | |
2934 | return 0; | |
2935 | goto nla_put_failure; | |
2936 | } | |
2937 | } else | |
8caaf7b6 | 2938 | #endif |
d948974c SB |
2939 | if (nla_put_u32(skb, RTA_IIF, fl4->flowi4_iif)) |
2940 | goto nla_put_failure; | |
2941 | } | |
1da177e4 LT |
2942 | } |
2943 | ||
d948974c SB |
2944 | error = rt->dst.error; |
2945 | ||
f185071d | 2946 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, error) < 0) |
e3703b3d | 2947 | goto nla_put_failure; |
be403ea1 | 2948 | |
053c095a JB |
2949 | nlmsg_end(skb, nlh); |
2950 | return 0; | |
1da177e4 | 2951 | |
be403ea1 | 2952 | nla_put_failure: |
26932566 PM |
2953 | nlmsg_cancel(skb, nlh); |
2954 | return -EMSGSIZE; | |
1da177e4 LT |
2955 | } |
2956 | ||
ee28906f SB |
2957 | static int fnhe_dump_bucket(struct net *net, struct sk_buff *skb, |
2958 | struct netlink_callback *cb, u32 table_id, | |
2959 | struct fnhe_hash_bucket *bucket, int genid, | |
e93fb3e9 | 2960 | int *fa_index, int fa_start, unsigned int flags) |
ee28906f SB |
2961 | { |
2962 | int i; | |
2963 | ||
2964 | for (i = 0; i < FNHE_HASH_SIZE; i++) { | |
2965 | struct fib_nh_exception *fnhe; | |
2966 | ||
2967 | for (fnhe = rcu_dereference(bucket[i].chain); fnhe; | |
2968 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
2969 | struct rtable *rt; | |
2970 | int err; | |
2971 | ||
2972 | if (*fa_index < fa_start) | |
2973 | goto next; | |
2974 | ||
2975 | if (fnhe->fnhe_genid != genid) | |
2976 | goto next; | |
2977 | ||
2978 | if (fnhe->fnhe_expires && | |
2979 | time_after(jiffies, fnhe->fnhe_expires)) | |
2980 | goto next; | |
2981 | ||
2982 | rt = rcu_dereference(fnhe->fnhe_rth_input); | |
2983 | if (!rt) | |
2984 | rt = rcu_dereference(fnhe->fnhe_rth_output); | |
2985 | if (!rt) | |
2986 | goto next; | |
2987 | ||
2988 | err = rt_fill_info(net, fnhe->fnhe_daddr, 0, rt, | |
2989 | table_id, NULL, skb, | |
2990 | NETLINK_CB(cb->skb).portid, | |
e93fb3e9 | 2991 | cb->nlh->nlmsg_seq, flags); |
ee28906f SB |
2992 | if (err) |
2993 | return err; | |
2994 | next: | |
2995 | (*fa_index)++; | |
2996 | } | |
2997 | } | |
2998 | ||
2999 | return 0; | |
3000 | } | |
3001 | ||
3002 | int fib_dump_info_fnhe(struct sk_buff *skb, struct netlink_callback *cb, | |
3003 | u32 table_id, struct fib_info *fi, | |
e93fb3e9 | 3004 | int *fa_index, int fa_start, unsigned int flags) |
ee28906f SB |
3005 | { |
3006 | struct net *net = sock_net(cb->skb->sk); | |
3007 | int nhsel, genid = fnhe_genid(net); | |
3008 | ||
3009 | for (nhsel = 0; nhsel < fib_info_num_path(fi); nhsel++) { | |
3010 | struct fib_nh_common *nhc = fib_info_nhc(fi, nhsel); | |
3011 | struct fnhe_hash_bucket *bucket; | |
3012 | int err; | |
3013 | ||
3014 | if (nhc->nhc_flags & RTNH_F_DEAD) | |
3015 | continue; | |
3016 | ||
93ed54b1 | 3017 | rcu_read_lock(); |
ee28906f | 3018 | bucket = rcu_dereference(nhc->nhc_exceptions); |
93ed54b1 ED |
3019 | err = 0; |
3020 | if (bucket) | |
3021 | err = fnhe_dump_bucket(net, skb, cb, table_id, bucket, | |
e93fb3e9 JF |
3022 | genid, fa_index, fa_start, |
3023 | flags); | |
93ed54b1 | 3024 | rcu_read_unlock(); |
ee28906f SB |
3025 | if (err) |
3026 | return err; | |
3027 | } | |
3028 | ||
3029 | return 0; | |
3030 | } | |
3031 | ||
404eb77e RP |
3032 | static struct sk_buff *inet_rtm_getroute_build_skb(__be32 src, __be32 dst, |
3033 | u8 ip_proto, __be16 sport, | |
3034 | __be16 dport) | |
3035 | { | |
3036 | struct sk_buff *skb; | |
3037 | struct iphdr *iph; | |
3038 | ||
3039 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
3040 | if (!skb) | |
3041 | return NULL; | |
3042 | ||
3043 | /* Reserve room for dummy headers, this skb can pass | |
3044 | * through good chunk of routing engine. | |
3045 | */ | |
3046 | skb_reset_mac_header(skb); | |
3047 | skb_reset_network_header(skb); | |
3048 | skb->protocol = htons(ETH_P_IP); | |
3049 | iph = skb_put(skb, sizeof(struct iphdr)); | |
3050 | iph->protocol = ip_proto; | |
3051 | iph->saddr = src; | |
3052 | iph->daddr = dst; | |
3053 | iph->version = 0x4; | |
3054 | iph->frag_off = 0; | |
3055 | iph->ihl = 0x5; | |
3056 | skb_set_transport_header(skb, skb->len); | |
3057 | ||
3058 | switch (iph->protocol) { | |
3059 | case IPPROTO_UDP: { | |
3060 | struct udphdr *udph; | |
3061 | ||
3062 | udph = skb_put_zero(skb, sizeof(struct udphdr)); | |
3063 | udph->source = sport; | |
3064 | udph->dest = dport; | |
3065 | udph->len = sizeof(struct udphdr); | |
3066 | udph->check = 0; | |
3067 | break; | |
3068 | } | |
3069 | case IPPROTO_TCP: { | |
3070 | struct tcphdr *tcph; | |
3071 | ||
3072 | tcph = skb_put_zero(skb, sizeof(struct tcphdr)); | |
3073 | tcph->source = sport; | |
3074 | tcph->dest = dport; | |
3075 | tcph->doff = sizeof(struct tcphdr) / 4; | |
3076 | tcph->rst = 1; | |
3077 | tcph->check = ~tcp_v4_check(sizeof(struct tcphdr), | |
3078 | src, dst, 0); | |
3079 | break; | |
3080 | } | |
3081 | case IPPROTO_ICMP: { | |
3082 | struct icmphdr *icmph; | |
3083 | ||
3084 | icmph = skb_put_zero(skb, sizeof(struct icmphdr)); | |
3085 | icmph->type = ICMP_ECHO; | |
3086 | icmph->code = 0; | |
3087 | } | |
3088 | } | |
3089 | ||
3090 | return skb; | |
3091 | } | |
3092 | ||
a00302b6 JK |
3093 | static int inet_rtm_valid_getroute_req(struct sk_buff *skb, |
3094 | const struct nlmsghdr *nlh, | |
3095 | struct nlattr **tb, | |
3096 | struct netlink_ext_ack *extack) | |
3097 | { | |
3098 | struct rtmsg *rtm; | |
3099 | int i, err; | |
3100 | ||
3101 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
3102 | NL_SET_ERR_MSG(extack, | |
3103 | "ipv4: Invalid header for route get request"); | |
3104 | return -EINVAL; | |
3105 | } | |
3106 | ||
3107 | if (!netlink_strict_get_check(skb)) | |
8cb08174 JB |
3108 | return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
3109 | rtm_ipv4_policy, extack); | |
a00302b6 JK |
3110 | |
3111 | rtm = nlmsg_data(nlh); | |
3112 | if ((rtm->rtm_src_len && rtm->rtm_src_len != 32) || | |
3113 | (rtm->rtm_dst_len && rtm->rtm_dst_len != 32) || | |
3114 | rtm->rtm_table || rtm->rtm_protocol || | |
3115 | rtm->rtm_scope || rtm->rtm_type) { | |
3116 | NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for route get request"); | |
3117 | return -EINVAL; | |
3118 | } | |
3119 | ||
3120 | if (rtm->rtm_flags & ~(RTM_F_NOTIFY | | |
3121 | RTM_F_LOOKUP_TABLE | | |
3122 | RTM_F_FIB_MATCH)) { | |
3123 | NL_SET_ERR_MSG(extack, "ipv4: Unsupported rtm_flags for route get request"); | |
3124 | return -EINVAL; | |
3125 | } | |
3126 | ||
8cb08174 JB |
3127 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
3128 | rtm_ipv4_policy, extack); | |
a00302b6 JK |
3129 | if (err) |
3130 | return err; | |
3131 | ||
3132 | if ((tb[RTA_SRC] && !rtm->rtm_src_len) || | |
3133 | (tb[RTA_DST] && !rtm->rtm_dst_len)) { | |
3134 | NL_SET_ERR_MSG(extack, "ipv4: rtm_src_len and rtm_dst_len must be 32 for IPv4"); | |
3135 | return -EINVAL; | |
3136 | } | |
3137 | ||
3138 | for (i = 0; i <= RTA_MAX; i++) { | |
3139 | if (!tb[i]) | |
3140 | continue; | |
3141 | ||
3142 | switch (i) { | |
3143 | case RTA_IIF: | |
3144 | case RTA_OIF: | |
3145 | case RTA_SRC: | |
3146 | case RTA_DST: | |
3147 | case RTA_IP_PROTO: | |
3148 | case RTA_SPORT: | |
3149 | case RTA_DPORT: | |
3150 | case RTA_MARK: | |
3151 | case RTA_UID: | |
3152 | break; | |
3153 | default: | |
3154 | NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in route get request"); | |
3155 | return -EINVAL; | |
3156 | } | |
3157 | } | |
3158 | ||
3159 | return 0; | |
3160 | } | |
3161 | ||
c21ef3e3 DA |
3162 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
3163 | struct netlink_ext_ack *extack) | |
1da177e4 | 3164 | { |
3b1e0a65 | 3165 | struct net *net = sock_net(in_skb->sk); |
d889ce3b | 3166 | struct nlattr *tb[RTA_MAX+1]; |
404eb77e RP |
3167 | u32 table_id = RT_TABLE_MAIN; |
3168 | __be16 sport = 0, dport = 0; | |
3765d35e | 3169 | struct fib_result res = {}; |
404eb77e | 3170 | u8 ip_proto = IPPROTO_UDP; |
1da177e4 | 3171 | struct rtable *rt = NULL; |
404eb77e RP |
3172 | struct sk_buff *skb; |
3173 | struct rtmsg *rtm; | |
e8e3fbe9 | 3174 | struct flowi4 fl4 = {}; |
9e12bb22 AV |
3175 | __be32 dst = 0; |
3176 | __be32 src = 0; | |
404eb77e | 3177 | kuid_t uid; |
9e12bb22 | 3178 | u32 iif; |
d889ce3b | 3179 | int err; |
963bfeee | 3180 | int mark; |
1da177e4 | 3181 | |
a00302b6 | 3182 | err = inet_rtm_valid_getroute_req(in_skb, nlh, tb, extack); |
d889ce3b | 3183 | if (err < 0) |
404eb77e | 3184 | return err; |
d889ce3b TG |
3185 | |
3186 | rtm = nlmsg_data(nlh); | |
67b61f6c JB |
3187 | src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0; |
3188 | dst = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0; | |
d889ce3b | 3189 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
963bfeee | 3190 | mark = tb[RTA_MARK] ? nla_get_u32(tb[RTA_MARK]) : 0; |
622ec2c9 LC |
3191 | if (tb[RTA_UID]) |
3192 | uid = make_kuid(current_user_ns(), nla_get_u32(tb[RTA_UID])); | |
3193 | else | |
3194 | uid = (iif ? INVALID_UID : current_uid()); | |
1da177e4 | 3195 | |
404eb77e RP |
3196 | if (tb[RTA_IP_PROTO]) { |
3197 | err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO], | |
5e1a99ea | 3198 | &ip_proto, AF_INET, extack); |
404eb77e RP |
3199 | if (err) |
3200 | return err; | |
3201 | } | |
bbadb9a2 | 3202 | |
404eb77e RP |
3203 | if (tb[RTA_SPORT]) |
3204 | sport = nla_get_be16(tb[RTA_SPORT]); | |
bbadb9a2 | 3205 | |
404eb77e RP |
3206 | if (tb[RTA_DPORT]) |
3207 | dport = nla_get_be16(tb[RTA_DPORT]); | |
3208 | ||
3209 | skb = inet_rtm_getroute_build_skb(src, dst, ip_proto, sport, dport); | |
3210 | if (!skb) | |
3211 | return -ENOBUFS; | |
bbadb9a2 | 3212 | |
d6c0a4f6 DM |
3213 | fl4.daddr = dst; |
3214 | fl4.saddr = src; | |
3215 | fl4.flowi4_tos = rtm->rtm_tos; | |
3216 | fl4.flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0; | |
3217 | fl4.flowi4_mark = mark; | |
622ec2c9 | 3218 | fl4.flowi4_uid = uid; |
404eb77e RP |
3219 | if (sport) |
3220 | fl4.fl4_sport = sport; | |
3221 | if (dport) | |
3222 | fl4.fl4_dport = dport; | |
3223 | fl4.flowi4_proto = ip_proto; | |
d6c0a4f6 | 3224 | |
3765d35e DA |
3225 | rcu_read_lock(); |
3226 | ||
1da177e4 | 3227 | if (iif) { |
d889ce3b TG |
3228 | struct net_device *dev; |
3229 | ||
3765d35e | 3230 | dev = dev_get_by_index_rcu(net, iif); |
51456b29 | 3231 | if (!dev) { |
d889ce3b | 3232 | err = -ENODEV; |
404eb77e | 3233 | goto errout_rcu; |
d889ce3b TG |
3234 | } |
3235 | ||
404eb77e | 3236 | fl4.flowi4_iif = iif; /* for rt_fill_info */ |
1da177e4 | 3237 | skb->dev = dev; |
963bfeee | 3238 | skb->mark = mark; |
3765d35e DA |
3239 | err = ip_route_input_rcu(skb, dst, src, rtm->rtm_tos, |
3240 | dev, &res); | |
d889ce3b | 3241 | |
511c3f92 | 3242 | rt = skb_rtable(skb); |
d8d1f30b CG |
3243 | if (err == 0 && rt->dst.error) |
3244 | err = -rt->dst.error; | |
1da177e4 | 3245 | } else { |
6503a304 | 3246 | fl4.flowi4_iif = LOOPBACK_IFINDEX; |
21f94775 | 3247 | skb->dev = net->loopback_dev; |
3765d35e | 3248 | rt = ip_route_output_key_hash_rcu(net, &fl4, &res, skb); |
b23dd4fe DM |
3249 | err = 0; |
3250 | if (IS_ERR(rt)) | |
3251 | err = PTR_ERR(rt); | |
2c87d63a FW |
3252 | else |
3253 | skb_dst_set(skb, &rt->dst); | |
1da177e4 | 3254 | } |
d889ce3b | 3255 | |
1da177e4 | 3256 | if (err) |
404eb77e | 3257 | goto errout_rcu; |
1da177e4 | 3258 | |
1da177e4 LT |
3259 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
3260 | rt->rt_flags |= RTCF_NOTIFY; | |
3261 | ||
c36ba660 | 3262 | if (rtm->rtm_flags & RTM_F_LOOKUP_TABLE) |
68e813aa | 3263 | table_id = res.table ? res.table->tb_id : 0; |
c36ba660 | 3264 | |
404eb77e RP |
3265 | /* reset skb for netlink reply msg */ |
3266 | skb_trim(skb, 0); | |
3267 | skb_reset_network_header(skb); | |
3268 | skb_reset_transport_header(skb); | |
3269 | skb_reset_mac_header(skb); | |
3270 | ||
bc3aae2b | 3271 | if (rtm->rtm_flags & RTM_F_FIB_MATCH) { |
1e301fd0 IS |
3272 | struct fib_rt_info fri; |
3273 | ||
bc3aae2b RP |
3274 | if (!res.fi) { |
3275 | err = fib_props[res.type].error; | |
3276 | if (!err) | |
3277 | err = -EHOSTUNREACH; | |
404eb77e | 3278 | goto errout_rcu; |
bc3aae2b | 3279 | } |
1e301fd0 IS |
3280 | fri.fi = res.fi; |
3281 | fri.tb_id = table_id; | |
3282 | fri.dst = res.prefix; | |
3283 | fri.dst_len = res.prefixlen; | |
3284 | fri.tos = fl4.flowi4_tos; | |
3285 | fri.type = rt->rt_type; | |
90b93f1b IS |
3286 | fri.offload = 0; |
3287 | fri.trap = 0; | |
3288 | if (res.fa_head) { | |
3289 | struct fib_alias *fa; | |
3290 | ||
3291 | hlist_for_each_entry_rcu(fa, res.fa_head, fa_list) { | |
3292 | u8 slen = 32 - fri.dst_len; | |
3293 | ||
3294 | if (fa->fa_slen == slen && | |
3295 | fa->tb_id == fri.tb_id && | |
3296 | fa->fa_tos == fri.tos && | |
3297 | fa->fa_info == res.fi && | |
3298 | fa->fa_type == fri.type) { | |
3299 | fri.offload = fa->offload; | |
3300 | fri.trap = fa->trap; | |
3301 | break; | |
3302 | } | |
3303 | } | |
3304 | } | |
b6179813 | 3305 | err = fib_dump_info(skb, NETLINK_CB(in_skb).portid, |
1e301fd0 | 3306 | nlh->nlmsg_seq, RTM_NEWROUTE, &fri, 0); |
bc3aae2b | 3307 | } else { |
404eb77e | 3308 | err = rt_fill_info(net, dst, src, rt, table_id, &fl4, skb, |
e93fb3e9 JF |
3309 | NETLINK_CB(in_skb).portid, |
3310 | nlh->nlmsg_seq, 0); | |
bc3aae2b | 3311 | } |
7b46a644 | 3312 | if (err < 0) |
404eb77e | 3313 | goto errout_rcu; |
1da177e4 | 3314 | |
3765d35e DA |
3315 | rcu_read_unlock(); |
3316 | ||
15e47304 | 3317 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
1da177e4 | 3318 | |
d889ce3b | 3319 | errout_free: |
404eb77e RP |
3320 | return err; |
3321 | errout_rcu: | |
3765d35e | 3322 | rcu_read_unlock(); |
1da177e4 | 3323 | kfree_skb(skb); |
404eb77e | 3324 | goto errout_free; |
1da177e4 LT |
3325 | } |
3326 | ||
1da177e4 LT |
3327 | void ip_rt_multicast_event(struct in_device *in_dev) |
3328 | { | |
4ccfe6d4 | 3329 | rt_cache_flush(dev_net(in_dev->dev)); |
1da177e4 LT |
3330 | } |
3331 | ||
3332 | #ifdef CONFIG_SYSCTL | |
082c7ca4 G |
3333 | static int ip_rt_gc_interval __read_mostly = 60 * HZ; |
3334 | static int ip_rt_gc_min_interval __read_mostly = HZ / 2; | |
3335 | static int ip_rt_gc_elasticity __read_mostly = 8; | |
773daa3c | 3336 | static int ip_min_valid_pmtu __read_mostly = IPV4_MIN_MTU; |
082c7ca4 | 3337 | |
fe2c6338 | 3338 | static int ipv4_sysctl_rtcache_flush(struct ctl_table *__ctl, int write, |
8d65af78 | 3339 | void __user *buffer, |
1da177e4 LT |
3340 | size_t *lenp, loff_t *ppos) |
3341 | { | |
5aad1de5 TT |
3342 | struct net *net = (struct net *)__ctl->extra1; |
3343 | ||
1da177e4 | 3344 | if (write) { |
5aad1de5 TT |
3345 | rt_cache_flush(net); |
3346 | fnhe_genid_bump(net); | |
1da177e4 | 3347 | return 0; |
e905a9ed | 3348 | } |
1da177e4 LT |
3349 | |
3350 | return -EINVAL; | |
3351 | } | |
3352 | ||
fe2c6338 | 3353 | static struct ctl_table ipv4_route_table[] = { |
1da177e4 | 3354 | { |
1da177e4 LT |
3355 | .procname = "gc_thresh", |
3356 | .data = &ipv4_dst_ops.gc_thresh, | |
3357 | .maxlen = sizeof(int), | |
3358 | .mode = 0644, | |
6d9f239a | 3359 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3360 | }, |
3361 | { | |
1da177e4 LT |
3362 | .procname = "max_size", |
3363 | .data = &ip_rt_max_size, | |
3364 | .maxlen = sizeof(int), | |
3365 | .mode = 0644, | |
6d9f239a | 3366 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3367 | }, |
3368 | { | |
3369 | /* Deprecated. Use gc_min_interval_ms */ | |
e905a9ed | 3370 | |
1da177e4 LT |
3371 | .procname = "gc_min_interval", |
3372 | .data = &ip_rt_gc_min_interval, | |
3373 | .maxlen = sizeof(int), | |
3374 | .mode = 0644, | |
6d9f239a | 3375 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3376 | }, |
3377 | { | |
1da177e4 LT |
3378 | .procname = "gc_min_interval_ms", |
3379 | .data = &ip_rt_gc_min_interval, | |
3380 | .maxlen = sizeof(int), | |
3381 | .mode = 0644, | |
6d9f239a | 3382 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 LT |
3383 | }, |
3384 | { | |
1da177e4 LT |
3385 | .procname = "gc_timeout", |
3386 | .data = &ip_rt_gc_timeout, | |
3387 | .maxlen = sizeof(int), | |
3388 | .mode = 0644, | |
6d9f239a | 3389 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 | 3390 | }, |
9f28a2fc ED |
3391 | { |
3392 | .procname = "gc_interval", | |
3393 | .data = &ip_rt_gc_interval, | |
3394 | .maxlen = sizeof(int), | |
3395 | .mode = 0644, | |
3396 | .proc_handler = proc_dointvec_jiffies, | |
3397 | }, | |
1da177e4 | 3398 | { |
1da177e4 LT |
3399 | .procname = "redirect_load", |
3400 | .data = &ip_rt_redirect_load, | |
3401 | .maxlen = sizeof(int), | |
3402 | .mode = 0644, | |
6d9f239a | 3403 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3404 | }, |
3405 | { | |
1da177e4 LT |
3406 | .procname = "redirect_number", |
3407 | .data = &ip_rt_redirect_number, | |
3408 | .maxlen = sizeof(int), | |
3409 | .mode = 0644, | |
6d9f239a | 3410 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3411 | }, |
3412 | { | |
1da177e4 LT |
3413 | .procname = "redirect_silence", |
3414 | .data = &ip_rt_redirect_silence, | |
3415 | .maxlen = sizeof(int), | |
3416 | .mode = 0644, | |
6d9f239a | 3417 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3418 | }, |
3419 | { | |
1da177e4 LT |
3420 | .procname = "error_cost", |
3421 | .data = &ip_rt_error_cost, | |
3422 | .maxlen = sizeof(int), | |
3423 | .mode = 0644, | |
6d9f239a | 3424 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3425 | }, |
3426 | { | |
1da177e4 LT |
3427 | .procname = "error_burst", |
3428 | .data = &ip_rt_error_burst, | |
3429 | .maxlen = sizeof(int), | |
3430 | .mode = 0644, | |
6d9f239a | 3431 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3432 | }, |
3433 | { | |
1da177e4 LT |
3434 | .procname = "gc_elasticity", |
3435 | .data = &ip_rt_gc_elasticity, | |
3436 | .maxlen = sizeof(int), | |
3437 | .mode = 0644, | |
6d9f239a | 3438 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3439 | }, |
3440 | { | |
1da177e4 LT |
3441 | .procname = "mtu_expires", |
3442 | .data = &ip_rt_mtu_expires, | |
3443 | .maxlen = sizeof(int), | |
3444 | .mode = 0644, | |
6d9f239a | 3445 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3446 | }, |
3447 | { | |
1da177e4 LT |
3448 | .procname = "min_pmtu", |
3449 | .data = &ip_rt_min_pmtu, | |
3450 | .maxlen = sizeof(int), | |
3451 | .mode = 0644, | |
c7272c2f SD |
3452 | .proc_handler = proc_dointvec_minmax, |
3453 | .extra1 = &ip_min_valid_pmtu, | |
1da177e4 LT |
3454 | }, |
3455 | { | |
1da177e4 LT |
3456 | .procname = "min_adv_mss", |
3457 | .data = &ip_rt_min_advmss, | |
3458 | .maxlen = sizeof(int), | |
3459 | .mode = 0644, | |
6d9f239a | 3460 | .proc_handler = proc_dointvec, |
1da177e4 | 3461 | }, |
f8572d8f | 3462 | { } |
1da177e4 | 3463 | }; |
39a23e75 | 3464 | |
5cdda5f1 CB |
3465 | static const char ipv4_route_flush_procname[] = "flush"; |
3466 | ||
39a23e75 DL |
3467 | static struct ctl_table ipv4_route_flush_table[] = { |
3468 | { | |
5cdda5f1 | 3469 | .procname = ipv4_route_flush_procname, |
39a23e75 DL |
3470 | .maxlen = sizeof(int), |
3471 | .mode = 0200, | |
6d9f239a | 3472 | .proc_handler = ipv4_sysctl_rtcache_flush, |
39a23e75 | 3473 | }, |
f8572d8f | 3474 | { }, |
39a23e75 DL |
3475 | }; |
3476 | ||
3477 | static __net_init int sysctl_route_net_init(struct net *net) | |
3478 | { | |
3479 | struct ctl_table *tbl; | |
3480 | ||
3481 | tbl = ipv4_route_flush_table; | |
09ad9bc7 | 3482 | if (!net_eq(net, &init_net)) { |
39a23e75 | 3483 | tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL); |
51456b29 | 3484 | if (!tbl) |
39a23e75 | 3485 | goto err_dup; |
464dc801 | 3486 | |
5cdda5f1 CB |
3487 | /* Don't export non-whitelisted sysctls to unprivileged users */ |
3488 | if (net->user_ns != &init_user_ns) { | |
3489 | if (tbl[0].procname != ipv4_route_flush_procname) | |
3490 | tbl[0].procname = NULL; | |
3491 | } | |
39a23e75 DL |
3492 | } |
3493 | tbl[0].extra1 = net; | |
3494 | ||
ec8f23ce | 3495 | net->ipv4.route_hdr = register_net_sysctl(net, "net/ipv4/route", tbl); |
51456b29 | 3496 | if (!net->ipv4.route_hdr) |
39a23e75 DL |
3497 | goto err_reg; |
3498 | return 0; | |
3499 | ||
3500 | err_reg: | |
3501 | if (tbl != ipv4_route_flush_table) | |
3502 | kfree(tbl); | |
3503 | err_dup: | |
3504 | return -ENOMEM; | |
3505 | } | |
3506 | ||
3507 | static __net_exit void sysctl_route_net_exit(struct net *net) | |
3508 | { | |
3509 | struct ctl_table *tbl; | |
3510 | ||
3511 | tbl = net->ipv4.route_hdr->ctl_table_arg; | |
3512 | unregister_net_sysctl_table(net->ipv4.route_hdr); | |
3513 | BUG_ON(tbl == ipv4_route_flush_table); | |
3514 | kfree(tbl); | |
3515 | } | |
3516 | ||
3517 | static __net_initdata struct pernet_operations sysctl_route_ops = { | |
3518 | .init = sysctl_route_net_init, | |
3519 | .exit = sysctl_route_net_exit, | |
3520 | }; | |
1da177e4 LT |
3521 | #endif |
3522 | ||
3ee94372 | 3523 | static __net_init int rt_genid_init(struct net *net) |
9f5e97e5 | 3524 | { |
ca4c3fc2 | 3525 | atomic_set(&net->ipv4.rt_genid, 0); |
5aad1de5 | 3526 | atomic_set(&net->fnhe_genid, 0); |
7aed9f72 | 3527 | atomic_set(&net->ipv4.dev_addr_genid, get_random_int()); |
9f5e97e5 DL |
3528 | return 0; |
3529 | } | |
3530 | ||
3ee94372 NH |
3531 | static __net_initdata struct pernet_operations rt_genid_ops = { |
3532 | .init = rt_genid_init, | |
9f5e97e5 DL |
3533 | }; |
3534 | ||
c3426b47 DM |
3535 | static int __net_init ipv4_inetpeer_init(struct net *net) |
3536 | { | |
3537 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3538 | ||
3539 | if (!bp) | |
3540 | return -ENOMEM; | |
3541 | inet_peer_base_init(bp); | |
3542 | net->ipv4.peers = bp; | |
3543 | return 0; | |
3544 | } | |
3545 | ||
3546 | static void __net_exit ipv4_inetpeer_exit(struct net *net) | |
3547 | { | |
3548 | struct inet_peer_base *bp = net->ipv4.peers; | |
3549 | ||
3550 | net->ipv4.peers = NULL; | |
56a6b248 | 3551 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3552 | kfree(bp); |
3553 | } | |
3554 | ||
3555 | static __net_initdata struct pernet_operations ipv4_inetpeer_ops = { | |
3556 | .init = ipv4_inetpeer_init, | |
3557 | .exit = ipv4_inetpeer_exit, | |
3558 | }; | |
9f5e97e5 | 3559 | |
c7066f70 | 3560 | #ifdef CONFIG_IP_ROUTE_CLASSID |
7d720c3e | 3561 | struct ip_rt_acct __percpu *ip_rt_acct __read_mostly; |
c7066f70 | 3562 | #endif /* CONFIG_IP_ROUTE_CLASSID */ |
1da177e4 | 3563 | |
1da177e4 LT |
3564 | int __init ip_rt_init(void) |
3565 | { | |
5055c371 | 3566 | int cpu; |
1da177e4 | 3567 | |
6da2ec56 KC |
3568 | ip_idents = kmalloc_array(IP_IDENTS_SZ, sizeof(*ip_idents), |
3569 | GFP_KERNEL); | |
73f156a6 ED |
3570 | if (!ip_idents) |
3571 | panic("IP: failed to allocate ip_idents\n"); | |
3572 | ||
3573 | prandom_bytes(ip_idents, IP_IDENTS_SZ * sizeof(*ip_idents)); | |
3574 | ||
355b590c ED |
3575 | ip_tstamps = kcalloc(IP_IDENTS_SZ, sizeof(*ip_tstamps), GFP_KERNEL); |
3576 | if (!ip_tstamps) | |
3577 | panic("IP: failed to allocate ip_tstamps\n"); | |
3578 | ||
5055c371 ED |
3579 | for_each_possible_cpu(cpu) { |
3580 | struct uncached_list *ul = &per_cpu(rt_uncached_list, cpu); | |
3581 | ||
3582 | INIT_LIST_HEAD(&ul->head); | |
3583 | spin_lock_init(&ul->lock); | |
3584 | } | |
c7066f70 | 3585 | #ifdef CONFIG_IP_ROUTE_CLASSID |
0dcec8c2 | 3586 | ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct), __alignof__(struct ip_rt_acct)); |
1da177e4 LT |
3587 | if (!ip_rt_acct) |
3588 | panic("IP: failed to allocate ip_rt_acct\n"); | |
1da177e4 LT |
3589 | #endif |
3590 | ||
e5d679f3 AD |
3591 | ipv4_dst_ops.kmem_cachep = |
3592 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, | |
20c2df83 | 3593 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 | 3594 | |
14e50e57 DM |
3595 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
3596 | ||
fc66f95c ED |
3597 | if (dst_entries_init(&ipv4_dst_ops) < 0) |
3598 | panic("IP: failed to allocate ipv4_dst_ops counter\n"); | |
3599 | ||
3600 | if (dst_entries_init(&ipv4_dst_blackhole_ops) < 0) | |
3601 | panic("IP: failed to allocate ipv4_dst_blackhole_ops counter\n"); | |
3602 | ||
89aef892 DM |
3603 | ipv4_dst_ops.gc_thresh = ~0; |
3604 | ip_rt_max_size = INT_MAX; | |
1da177e4 | 3605 | |
1da177e4 LT |
3606 | devinet_init(); |
3607 | ip_fib_init(); | |
3608 | ||
73b38711 | 3609 | if (ip_rt_proc_init()) |
058bd4d2 | 3610 | pr_err("Unable to create route proc files\n"); |
1da177e4 LT |
3611 | #ifdef CONFIG_XFRM |
3612 | xfrm_init(); | |
703fb94e | 3613 | xfrm4_init(); |
1da177e4 | 3614 | #endif |
394f51ab FW |
3615 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL, |
3616 | RTNL_FLAG_DOIT_UNLOCKED); | |
63f3444f | 3617 | |
39a23e75 DL |
3618 | #ifdef CONFIG_SYSCTL |
3619 | register_pernet_subsys(&sysctl_route_ops); | |
3620 | #endif | |
3ee94372 | 3621 | register_pernet_subsys(&rt_genid_ops); |
c3426b47 | 3622 | register_pernet_subsys(&ipv4_inetpeer_ops); |
1bcdca3f | 3623 | return 0; |
1da177e4 LT |
3624 | } |
3625 | ||
a1bc6eb4 | 3626 | #ifdef CONFIG_SYSCTL |
eeb61f71 AV |
3627 | /* |
3628 | * We really need to sanitize the damn ipv4 init order, then all | |
3629 | * this nonsense will go away. | |
3630 | */ | |
3631 | void __init ip_static_sysctl_init(void) | |
3632 | { | |
4e5ca785 | 3633 | register_net_sysctl(&init_net, "net/ipv4/route", ipv4_route_table); |
eeb61f71 | 3634 | } |
a1bc6eb4 | 3635 | #endif |