]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * ROUTE - implementation of the IP router. | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
11 | * Linus Torvalds, <Linus.Torvalds@helsinki.fi> | |
12 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
13 | * | |
14 | * Fixes: | |
15 | * Alan Cox : Verify area fixes. | |
16 | * Alan Cox : cli() protects routing changes | |
17 | * Rui Oliveira : ICMP routing table updates | |
18 | * (rco@di.uminho.pt) Routing table insertion and update | |
19 | * Linus Torvalds : Rewrote bits to be sensible | |
20 | * Alan Cox : Added BSD route gw semantics | |
e905a9ed | 21 | * Alan Cox : Super /proc >4K |
1da177e4 LT |
22 | * Alan Cox : MTU in route table |
23 | * Alan Cox : MSS actually. Also added the window | |
24 | * clamper. | |
25 | * Sam Lantinga : Fixed route matching in rt_del() | |
26 | * Alan Cox : Routing cache support. | |
27 | * Alan Cox : Removed compatibility cruft. | |
28 | * Alan Cox : RTF_REJECT support. | |
29 | * Alan Cox : TCP irtt support. | |
30 | * Jonathan Naylor : Added Metric support. | |
31 | * Miquel van Smoorenburg : BSD API fixes. | |
32 | * Miquel van Smoorenburg : Metrics. | |
33 | * Alan Cox : Use __u32 properly | |
34 | * Alan Cox : Aligned routing errors more closely with BSD | |
35 | * our system is still very different. | |
36 | * Alan Cox : Faster /proc handling | |
37 | * Alexey Kuznetsov : Massive rework to support tree based routing, | |
38 | * routing caches and better behaviour. | |
e905a9ed | 39 | * |
1da177e4 LT |
40 | * Olaf Erb : irtt wasn't being copied right. |
41 | * Bjorn Ekwall : Kerneld route support. | |
42 | * Alan Cox : Multicast fixed (I hope) | |
43 | * Pavel Krauz : Limited broadcast fixed | |
44 | * Mike McLagan : Routing by source | |
45 | * Alexey Kuznetsov : End of old history. Split to fib.c and | |
46 | * route.c and rewritten from scratch. | |
47 | * Andi Kleen : Load-limit warning messages. | |
48 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. | |
49 | * Vitaly E. Lavrov : Race condition in ip_route_input_slow. | |
50 | * Tobias Ringstrom : Uninitialized res.type in ip_route_output_slow. | |
51 | * Vladimir V. Ivanov : IP rule info (flowid) is really useful. | |
52 | * Marc Boucher : routing by fwmark | |
53 | * Robert Olsson : Added rt_cache statistics | |
54 | * Arnaldo C. Melo : Convert proc stuff to seq_file | |
bb1d23b0 | 55 | * Eric Dumazet : hashed spinlocks and rt_check_expire() fixes. |
cef2685e IS |
56 | * Ilia Sotnikov : Ignore TOS on PMTUD and Redirect |
57 | * Ilia Sotnikov : Removed TOS from hash calculations | |
1da177e4 LT |
58 | * |
59 | * This program is free software; you can redistribute it and/or | |
60 | * modify it under the terms of the GNU General Public License | |
61 | * as published by the Free Software Foundation; either version | |
62 | * 2 of the License, or (at your option) any later version. | |
63 | */ | |
64 | ||
afd46503 JP |
65 | #define pr_fmt(fmt) "IPv4: " fmt |
66 | ||
1da177e4 | 67 | #include <linux/module.h> |
7c0f6ba6 | 68 | #include <linux/uaccess.h> |
1da177e4 LT |
69 | #include <linux/bitops.h> |
70 | #include <linux/types.h> | |
71 | #include <linux/kernel.h> | |
1da177e4 LT |
72 | #include <linux/mm.h> |
73 | #include <linux/string.h> | |
74 | #include <linux/socket.h> | |
75 | #include <linux/sockios.h> | |
76 | #include <linux/errno.h> | |
77 | #include <linux/in.h> | |
78 | #include <linux/inet.h> | |
79 | #include <linux/netdevice.h> | |
80 | #include <linux/proc_fs.h> | |
81 | #include <linux/init.h> | |
82 | #include <linux/skbuff.h> | |
1da177e4 LT |
83 | #include <linux/inetdevice.h> |
84 | #include <linux/igmp.h> | |
85 | #include <linux/pkt_sched.h> | |
86 | #include <linux/mroute.h> | |
87 | #include <linux/netfilter_ipv4.h> | |
88 | #include <linux/random.h> | |
1da177e4 LT |
89 | #include <linux/rcupdate.h> |
90 | #include <linux/times.h> | |
5a0e3ad6 | 91 | #include <linux/slab.h> |
73f156a6 | 92 | #include <linux/jhash.h> |
352e512c | 93 | #include <net/dst.h> |
1b7179d3 | 94 | #include <net/dst_metadata.h> |
457c4cbc | 95 | #include <net/net_namespace.h> |
1da177e4 LT |
96 | #include <net/protocol.h> |
97 | #include <net/ip.h> | |
98 | #include <net/route.h> | |
99 | #include <net/inetpeer.h> | |
100 | #include <net/sock.h> | |
101 | #include <net/ip_fib.h> | |
102 | #include <net/arp.h> | |
103 | #include <net/tcp.h> | |
104 | #include <net/icmp.h> | |
105 | #include <net/xfrm.h> | |
571e7226 | 106 | #include <net/lwtunnel.h> |
8d71740c | 107 | #include <net/netevent.h> |
63f3444f | 108 | #include <net/rtnetlink.h> |
1da177e4 LT |
109 | #ifdef CONFIG_SYSCTL |
110 | #include <linux/sysctl.h> | |
7426a564 | 111 | #include <linux/kmemleak.h> |
1da177e4 | 112 | #endif |
6e5714ea | 113 | #include <net/secure_seq.h> |
1b7179d3 | 114 | #include <net/ip_tunnels.h> |
385add90 | 115 | #include <net/l3mdev.h> |
1da177e4 | 116 | |
b6179813 RP |
117 | #include "fib_lookup.h" |
118 | ||
68a5e3dd | 119 | #define RT_FL_TOS(oldflp4) \ |
f61759e6 | 120 | ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK)) |
1da177e4 | 121 | |
1da177e4 LT |
122 | #define RT_GC_TIMEOUT (300*HZ) |
123 | ||
1da177e4 | 124 | static int ip_rt_max_size; |
817bc4db SH |
125 | static int ip_rt_redirect_number __read_mostly = 9; |
126 | static int ip_rt_redirect_load __read_mostly = HZ / 50; | |
127 | static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); | |
128 | static int ip_rt_error_cost __read_mostly = HZ; | |
129 | static int ip_rt_error_burst __read_mostly = 5 * HZ; | |
817bc4db SH |
130 | static int ip_rt_mtu_expires __read_mostly = 10 * 60 * HZ; |
131 | static int ip_rt_min_pmtu __read_mostly = 512 + 20 + 20; | |
132 | static int ip_rt_min_advmss __read_mostly = 256; | |
9f28a2fc | 133 | |
deed49df | 134 | static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; |
1da177e4 LT |
135 | /* |
136 | * Interface to generic destination cache. | |
137 | */ | |
138 | ||
139 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); | |
0dbaee3b | 140 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 141 | static unsigned int ipv4_mtu(const struct dst_entry *dst); |
1da177e4 LT |
142 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); |
143 | static void ipv4_link_failure(struct sk_buff *skb); | |
6700c270 DM |
144 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
145 | struct sk_buff *skb, u32 mtu); | |
146 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, | |
147 | struct sk_buff *skb); | |
caacf05e | 148 | static void ipv4_dst_destroy(struct dst_entry *dst); |
1da177e4 | 149 | |
62fa8a84 DM |
150 | static u32 *ipv4_cow_metrics(struct dst_entry *dst, unsigned long old) |
151 | { | |
31248731 DM |
152 | WARN_ON(1); |
153 | return NULL; | |
62fa8a84 DM |
154 | } |
155 | ||
f894cbf8 DM |
156 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
157 | struct sk_buff *skb, | |
158 | const void *daddr); | |
63fca65d | 159 | static void ipv4_confirm_neigh(const struct dst_entry *dst, const void *daddr); |
d3aaeb38 | 160 | |
1da177e4 LT |
161 | static struct dst_ops ipv4_dst_ops = { |
162 | .family = AF_INET, | |
1da177e4 | 163 | .check = ipv4_dst_check, |
0dbaee3b | 164 | .default_advmss = ipv4_default_advmss, |
ebb762f2 | 165 | .mtu = ipv4_mtu, |
62fa8a84 | 166 | .cow_metrics = ipv4_cow_metrics, |
caacf05e | 167 | .destroy = ipv4_dst_destroy, |
1da177e4 LT |
168 | .negative_advice = ipv4_negative_advice, |
169 | .link_failure = ipv4_link_failure, | |
170 | .update_pmtu = ip_rt_update_pmtu, | |
e47a185b | 171 | .redirect = ip_do_redirect, |
b92dacd4 | 172 | .local_out = __ip_local_out, |
d3aaeb38 | 173 | .neigh_lookup = ipv4_neigh_lookup, |
63fca65d | 174 | .confirm_neigh = ipv4_confirm_neigh, |
1da177e4 LT |
175 | }; |
176 | ||
177 | #define ECN_OR_COST(class) TC_PRIO_##class | |
178 | ||
4839c52b | 179 | const __u8 ip_tos2prio[16] = { |
1da177e4 | 180 | TC_PRIO_BESTEFFORT, |
4a2b9c37 | 181 | ECN_OR_COST(BESTEFFORT), |
1da177e4 LT |
182 | TC_PRIO_BESTEFFORT, |
183 | ECN_OR_COST(BESTEFFORT), | |
184 | TC_PRIO_BULK, | |
185 | ECN_OR_COST(BULK), | |
186 | TC_PRIO_BULK, | |
187 | ECN_OR_COST(BULK), | |
188 | TC_PRIO_INTERACTIVE, | |
189 | ECN_OR_COST(INTERACTIVE), | |
190 | TC_PRIO_INTERACTIVE, | |
191 | ECN_OR_COST(INTERACTIVE), | |
192 | TC_PRIO_INTERACTIVE_BULK, | |
193 | ECN_OR_COST(INTERACTIVE_BULK), | |
194 | TC_PRIO_INTERACTIVE_BULK, | |
195 | ECN_OR_COST(INTERACTIVE_BULK) | |
196 | }; | |
d4a96865 | 197 | EXPORT_SYMBOL(ip_tos2prio); |
1da177e4 | 198 | |
2f970d83 | 199 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
3ed66e91 | 200 | #define RT_CACHE_STAT_INC(field) raw_cpu_inc(rt_cache_stat.field) |
1da177e4 | 201 | |
1da177e4 | 202 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
203 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) |
204 | { | |
29e75252 | 205 | if (*pos) |
89aef892 | 206 | return NULL; |
29e75252 | 207 | return SEQ_START_TOKEN; |
1da177e4 LT |
208 | } |
209 | ||
210 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
211 | { | |
1da177e4 | 212 | ++*pos; |
89aef892 | 213 | return NULL; |
1da177e4 LT |
214 | } |
215 | ||
216 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) | |
217 | { | |
1da177e4 LT |
218 | } |
219 | ||
220 | static int rt_cache_seq_show(struct seq_file *seq, void *v) | |
221 | { | |
222 | if (v == SEQ_START_TOKEN) | |
223 | seq_printf(seq, "%-127s\n", | |
224 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" | |
225 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" | |
226 | "HHUptod\tSpecDst"); | |
e905a9ed | 227 | return 0; |
1da177e4 LT |
228 | } |
229 | ||
f690808e | 230 | static const struct seq_operations rt_cache_seq_ops = { |
1da177e4 LT |
231 | .start = rt_cache_seq_start, |
232 | .next = rt_cache_seq_next, | |
233 | .stop = rt_cache_seq_stop, | |
234 | .show = rt_cache_seq_show, | |
235 | }; | |
236 | ||
237 | static int rt_cache_seq_open(struct inode *inode, struct file *file) | |
238 | { | |
89aef892 | 239 | return seq_open(file, &rt_cache_seq_ops); |
1da177e4 LT |
240 | } |
241 | ||
9a32144e | 242 | static const struct file_operations rt_cache_seq_fops = { |
1da177e4 LT |
243 | .open = rt_cache_seq_open, |
244 | .read = seq_read, | |
245 | .llseek = seq_lseek, | |
89aef892 | 246 | .release = seq_release, |
1da177e4 LT |
247 | }; |
248 | ||
249 | ||
250 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
251 | { | |
252 | int cpu; | |
253 | ||
254 | if (*pos == 0) | |
255 | return SEQ_START_TOKEN; | |
256 | ||
0f23174a | 257 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
258 | if (!cpu_possible(cpu)) |
259 | continue; | |
260 | *pos = cpu+1; | |
2f970d83 | 261 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
262 | } |
263 | return NULL; | |
264 | } | |
265 | ||
266 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
267 | { | |
268 | int cpu; | |
269 | ||
0f23174a | 270 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
271 | if (!cpu_possible(cpu)) |
272 | continue; | |
273 | *pos = cpu+1; | |
2f970d83 | 274 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
275 | } |
276 | return NULL; | |
e905a9ed | 277 | |
1da177e4 LT |
278 | } |
279 | ||
280 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) | |
281 | { | |
282 | ||
283 | } | |
284 | ||
285 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) | |
286 | { | |
287 | struct rt_cache_stat *st = v; | |
288 | ||
289 | if (v == SEQ_START_TOKEN) { | |
5bec0039 | 290 | 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 |
291 | return 0; |
292 | } | |
e905a9ed | 293 | |
1da177e4 LT |
294 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
295 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", | |
fc66f95c | 296 | dst_entries_get_slow(&ipv4_dst_ops), |
0baf2b35 | 297 | 0, /* st->in_hit */ |
1da177e4 LT |
298 | st->in_slow_tot, |
299 | st->in_slow_mc, | |
300 | st->in_no_route, | |
301 | st->in_brd, | |
302 | st->in_martian_dst, | |
303 | st->in_martian_src, | |
304 | ||
0baf2b35 | 305 | 0, /* st->out_hit */ |
1da177e4 | 306 | st->out_slow_tot, |
e905a9ed | 307 | st->out_slow_mc, |
1da177e4 | 308 | |
0baf2b35 ED |
309 | 0, /* st->gc_total */ |
310 | 0, /* st->gc_ignored */ | |
311 | 0, /* st->gc_goal_miss */ | |
312 | 0, /* st->gc_dst_overflow */ | |
313 | 0, /* st->in_hlist_search */ | |
314 | 0 /* st->out_hlist_search */ | |
1da177e4 LT |
315 | ); |
316 | return 0; | |
317 | } | |
318 | ||
f690808e | 319 | static const struct seq_operations rt_cpu_seq_ops = { |
1da177e4 LT |
320 | .start = rt_cpu_seq_start, |
321 | .next = rt_cpu_seq_next, | |
322 | .stop = rt_cpu_seq_stop, | |
323 | .show = rt_cpu_seq_show, | |
324 | }; | |
325 | ||
326 | ||
327 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) | |
328 | { | |
329 | return seq_open(file, &rt_cpu_seq_ops); | |
330 | } | |
331 | ||
9a32144e | 332 | static const struct file_operations rt_cpu_seq_fops = { |
1da177e4 LT |
333 | .open = rt_cpu_seq_open, |
334 | .read = seq_read, | |
335 | .llseek = seq_lseek, | |
336 | .release = seq_release, | |
337 | }; | |
338 | ||
c7066f70 | 339 | #ifdef CONFIG_IP_ROUTE_CLASSID |
a661c419 | 340 | static int rt_acct_proc_show(struct seq_file *m, void *v) |
78c686e9 | 341 | { |
a661c419 AD |
342 | struct ip_rt_acct *dst, *src; |
343 | unsigned int i, j; | |
344 | ||
345 | dst = kcalloc(256, sizeof(struct ip_rt_acct), GFP_KERNEL); | |
346 | if (!dst) | |
347 | return -ENOMEM; | |
348 | ||
349 | for_each_possible_cpu(i) { | |
350 | src = (struct ip_rt_acct *)per_cpu_ptr(ip_rt_acct, i); | |
351 | for (j = 0; j < 256; j++) { | |
352 | dst[j].o_bytes += src[j].o_bytes; | |
353 | dst[j].o_packets += src[j].o_packets; | |
354 | dst[j].i_bytes += src[j].i_bytes; | |
355 | dst[j].i_packets += src[j].i_packets; | |
356 | } | |
78c686e9 PE |
357 | } |
358 | ||
a661c419 AD |
359 | seq_write(m, dst, 256 * sizeof(struct ip_rt_acct)); |
360 | kfree(dst); | |
361 | return 0; | |
362 | } | |
78c686e9 | 363 | |
a661c419 AD |
364 | static int rt_acct_proc_open(struct inode *inode, struct file *file) |
365 | { | |
366 | return single_open(file, rt_acct_proc_show, NULL); | |
78c686e9 | 367 | } |
a661c419 AD |
368 | |
369 | static const struct file_operations rt_acct_proc_fops = { | |
a661c419 AD |
370 | .open = rt_acct_proc_open, |
371 | .read = seq_read, | |
372 | .llseek = seq_lseek, | |
373 | .release = single_release, | |
374 | }; | |
78c686e9 | 375 | #endif |
107f1634 | 376 | |
73b38711 | 377 | static int __net_init ip_rt_do_proc_init(struct net *net) |
107f1634 PE |
378 | { |
379 | struct proc_dir_entry *pde; | |
380 | ||
d4beaa66 G |
381 | pde = proc_create("rt_cache", S_IRUGO, net->proc_net, |
382 | &rt_cache_seq_fops); | |
107f1634 PE |
383 | if (!pde) |
384 | goto err1; | |
385 | ||
77020720 WC |
386 | pde = proc_create("rt_cache", S_IRUGO, |
387 | net->proc_net_stat, &rt_cpu_seq_fops); | |
107f1634 PE |
388 | if (!pde) |
389 | goto err2; | |
390 | ||
c7066f70 | 391 | #ifdef CONFIG_IP_ROUTE_CLASSID |
a661c419 | 392 | pde = proc_create("rt_acct", 0, net->proc_net, &rt_acct_proc_fops); |
107f1634 PE |
393 | if (!pde) |
394 | goto err3; | |
395 | #endif | |
396 | return 0; | |
397 | ||
c7066f70 | 398 | #ifdef CONFIG_IP_ROUTE_CLASSID |
107f1634 PE |
399 | err3: |
400 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
401 | #endif | |
402 | err2: | |
403 | remove_proc_entry("rt_cache", net->proc_net); | |
404 | err1: | |
405 | return -ENOMEM; | |
406 | } | |
73b38711 DL |
407 | |
408 | static void __net_exit ip_rt_do_proc_exit(struct net *net) | |
409 | { | |
410 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
411 | remove_proc_entry("rt_cache", net->proc_net); | |
c7066f70 | 412 | #ifdef CONFIG_IP_ROUTE_CLASSID |
73b38711 | 413 | remove_proc_entry("rt_acct", net->proc_net); |
0a931acf | 414 | #endif |
73b38711 DL |
415 | } |
416 | ||
417 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { | |
418 | .init = ip_rt_do_proc_init, | |
419 | .exit = ip_rt_do_proc_exit, | |
f84c6821 | 420 | .async = true, |
73b38711 DL |
421 | }; |
422 | ||
423 | static int __init ip_rt_proc_init(void) | |
424 | { | |
425 | return register_pernet_subsys(&ip_rt_proc_ops); | |
426 | } | |
427 | ||
107f1634 | 428 | #else |
73b38711 | 429 | static inline int ip_rt_proc_init(void) |
107f1634 PE |
430 | { |
431 | return 0; | |
432 | } | |
1da177e4 | 433 | #endif /* CONFIG_PROC_FS */ |
e905a9ed | 434 | |
4331debc | 435 | static inline bool rt_is_expired(const struct rtable *rth) |
e84f84f2 | 436 | { |
ca4c3fc2 | 437 | return rth->rt_genid != rt_genid_ipv4(dev_net(rth->dst.dev)); |
e84f84f2 DL |
438 | } |
439 | ||
4ccfe6d4 | 440 | void rt_cache_flush(struct net *net) |
1da177e4 | 441 | { |
ca4c3fc2 | 442 | rt_genid_bump_ipv4(net); |
98376387 ED |
443 | } |
444 | ||
f894cbf8 DM |
445 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
446 | struct sk_buff *skb, | |
447 | const void *daddr) | |
3769cffb | 448 | { |
d3aaeb38 DM |
449 | struct net_device *dev = dst->dev; |
450 | const __be32 *pkey = daddr; | |
39232973 | 451 | const struct rtable *rt; |
3769cffb DM |
452 | struct neighbour *n; |
453 | ||
39232973 | 454 | rt = (const struct rtable *) dst; |
a263b309 | 455 | if (rt->rt_gateway) |
39232973 | 456 | pkey = (const __be32 *) &rt->rt_gateway; |
f894cbf8 DM |
457 | else if (skb) |
458 | pkey = &ip_hdr(skb)->daddr; | |
d3aaeb38 | 459 | |
80703d26 | 460 | n = __ipv4_neigh_lookup(dev, *(__force u32 *)pkey); |
d3aaeb38 DM |
461 | if (n) |
462 | return n; | |
32092ecf | 463 | return neigh_create(&arp_tbl, pkey, dev); |
d3aaeb38 DM |
464 | } |
465 | ||
63fca65d JA |
466 | static void ipv4_confirm_neigh(const struct dst_entry *dst, const void *daddr) |
467 | { | |
468 | struct net_device *dev = dst->dev; | |
469 | const __be32 *pkey = daddr; | |
470 | const struct rtable *rt; | |
471 | ||
472 | rt = (const struct rtable *)dst; | |
473 | if (rt->rt_gateway) | |
474 | pkey = (const __be32 *)&rt->rt_gateway; | |
475 | else if (!daddr || | |
476 | (rt->rt_flags & | |
477 | (RTCF_MULTICAST | RTCF_BROADCAST | RTCF_LOCAL))) | |
478 | return; | |
479 | ||
480 | __ipv4_confirm_neigh(dev, *(__force u32 *)pkey); | |
481 | } | |
482 | ||
04ca6973 | 483 | #define IP_IDENTS_SZ 2048u |
04ca6973 | 484 | |
355b590c ED |
485 | static atomic_t *ip_idents __read_mostly; |
486 | static u32 *ip_tstamps __read_mostly; | |
04ca6973 ED |
487 | |
488 | /* In order to protect privacy, we add a perturbation to identifiers | |
489 | * if one generator is seldom used. This makes hard for an attacker | |
490 | * to infer how many packets were sent between two points in time. | |
491 | */ | |
492 | u32 ip_idents_reserve(u32 hash, int segs) | |
493 | { | |
355b590c ED |
494 | u32 *p_tstamp = ip_tstamps + hash % IP_IDENTS_SZ; |
495 | atomic_t *p_id = ip_idents + hash % IP_IDENTS_SZ; | |
6aa7de05 | 496 | u32 old = READ_ONCE(*p_tstamp); |
04ca6973 | 497 | u32 now = (u32)jiffies; |
adb03115 | 498 | u32 new, delta = 0; |
04ca6973 | 499 | |
355b590c | 500 | if (old != now && cmpxchg(p_tstamp, old, now) == old) |
04ca6973 ED |
501 | delta = prandom_u32_max(now - old); |
502 | ||
adb03115 ED |
503 | /* Do not use atomic_add_return() as it makes UBSAN unhappy */ |
504 | do { | |
505 | old = (u32)atomic_read(p_id); | |
506 | new = old + delta + segs; | |
507 | } while (atomic_cmpxchg(p_id, old, new) != old); | |
508 | ||
509 | return new - segs; | |
04ca6973 ED |
510 | } |
511 | EXPORT_SYMBOL(ip_idents_reserve); | |
1da177e4 | 512 | |
b6a7719a | 513 | void __ip_select_ident(struct net *net, struct iphdr *iph, int segs) |
1da177e4 | 514 | { |
73f156a6 ED |
515 | static u32 ip_idents_hashrnd __read_mostly; |
516 | u32 hash, id; | |
1da177e4 | 517 | |
73f156a6 | 518 | net_get_random_once(&ip_idents_hashrnd, sizeof(ip_idents_hashrnd)); |
1da177e4 | 519 | |
04ca6973 ED |
520 | hash = jhash_3words((__force u32)iph->daddr, |
521 | (__force u32)iph->saddr, | |
b6a7719a | 522 | iph->protocol ^ net_hash_mix(net), |
04ca6973 | 523 | ip_idents_hashrnd); |
73f156a6 ED |
524 | id = ip_idents_reserve(hash, segs); |
525 | iph->id = htons(id); | |
1da177e4 | 526 | } |
4bc2f18b | 527 | EXPORT_SYMBOL(__ip_select_ident); |
1da177e4 | 528 | |
e2d118a1 LC |
529 | static void __build_flow_key(const struct net *net, struct flowi4 *fl4, |
530 | const struct sock *sk, | |
4895c771 DM |
531 | const struct iphdr *iph, |
532 | int oif, u8 tos, | |
533 | u8 prot, u32 mark, int flow_flags) | |
534 | { | |
535 | if (sk) { | |
536 | const struct inet_sock *inet = inet_sk(sk); | |
537 | ||
538 | oif = sk->sk_bound_dev_if; | |
539 | mark = sk->sk_mark; | |
540 | tos = RT_CONN_FLAGS(sk); | |
541 | prot = inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol; | |
542 | } | |
543 | flowi4_init_output(fl4, oif, mark, tos, | |
544 | RT_SCOPE_UNIVERSE, prot, | |
545 | flow_flags, | |
e2d118a1 LC |
546 | iph->daddr, iph->saddr, 0, 0, |
547 | sock_net_uid(net, sk)); | |
4895c771 DM |
548 | } |
549 | ||
5abf7f7e ED |
550 | static void build_skb_flow_key(struct flowi4 *fl4, const struct sk_buff *skb, |
551 | const struct sock *sk) | |
4895c771 | 552 | { |
d109e61b | 553 | const struct net *net = dev_net(skb->dev); |
4895c771 DM |
554 | const struct iphdr *iph = ip_hdr(skb); |
555 | int oif = skb->dev->ifindex; | |
556 | u8 tos = RT_TOS(iph->tos); | |
557 | u8 prot = iph->protocol; | |
558 | u32 mark = skb->mark; | |
559 | ||
d109e61b | 560 | __build_flow_key(net, fl4, sk, iph, oif, tos, prot, mark, 0); |
4895c771 DM |
561 | } |
562 | ||
5abf7f7e | 563 | static void build_sk_flow_key(struct flowi4 *fl4, const struct sock *sk) |
4895c771 DM |
564 | { |
565 | const struct inet_sock *inet = inet_sk(sk); | |
5abf7f7e | 566 | const struct ip_options_rcu *inet_opt; |
4895c771 DM |
567 | __be32 daddr = inet->inet_daddr; |
568 | ||
569 | rcu_read_lock(); | |
570 | inet_opt = rcu_dereference(inet->inet_opt); | |
571 | if (inet_opt && inet_opt->opt.srr) | |
572 | daddr = inet_opt->opt.faddr; | |
573 | flowi4_init_output(fl4, sk->sk_bound_dev_if, sk->sk_mark, | |
574 | RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, | |
575 | inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol, | |
576 | inet_sk_flowi_flags(sk), | |
e2d118a1 | 577 | daddr, inet->inet_saddr, 0, 0, sk->sk_uid); |
4895c771 DM |
578 | rcu_read_unlock(); |
579 | } | |
580 | ||
5abf7f7e ED |
581 | static void ip_rt_build_flow_key(struct flowi4 *fl4, const struct sock *sk, |
582 | const struct sk_buff *skb) | |
4895c771 DM |
583 | { |
584 | if (skb) | |
585 | build_skb_flow_key(fl4, skb, sk); | |
586 | else | |
587 | build_sk_flow_key(fl4, sk); | |
588 | } | |
589 | ||
c5038a83 | 590 | static DEFINE_SPINLOCK(fnhe_lock); |
4895c771 | 591 | |
2ffae99d TT |
592 | static void fnhe_flush_routes(struct fib_nh_exception *fnhe) |
593 | { | |
594 | struct rtable *rt; | |
595 | ||
596 | rt = rcu_dereference(fnhe->fnhe_rth_input); | |
597 | if (rt) { | |
598 | RCU_INIT_POINTER(fnhe->fnhe_rth_input, NULL); | |
95c47f9c | 599 | dst_dev_put(&rt->dst); |
0830106c | 600 | dst_release(&rt->dst); |
2ffae99d TT |
601 | } |
602 | rt = rcu_dereference(fnhe->fnhe_rth_output); | |
603 | if (rt) { | |
604 | RCU_INIT_POINTER(fnhe->fnhe_rth_output, NULL); | |
95c47f9c | 605 | dst_dev_put(&rt->dst); |
0830106c | 606 | dst_release(&rt->dst); |
2ffae99d TT |
607 | } |
608 | } | |
609 | ||
aee06da6 | 610 | static struct fib_nh_exception *fnhe_oldest(struct fnhe_hash_bucket *hash) |
4895c771 DM |
611 | { |
612 | struct fib_nh_exception *fnhe, *oldest; | |
613 | ||
614 | oldest = rcu_dereference(hash->chain); | |
615 | for (fnhe = rcu_dereference(oldest->fnhe_next); fnhe; | |
616 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
617 | if (time_before(fnhe->fnhe_stamp, oldest->fnhe_stamp)) | |
618 | oldest = fnhe; | |
619 | } | |
2ffae99d | 620 | fnhe_flush_routes(oldest); |
4895c771 DM |
621 | return oldest; |
622 | } | |
623 | ||
d3a25c98 DM |
624 | static inline u32 fnhe_hashfun(__be32 daddr) |
625 | { | |
d546c621 | 626 | static u32 fnhe_hashrnd __read_mostly; |
d3a25c98 DM |
627 | u32 hval; |
628 | ||
d546c621 ED |
629 | net_get_random_once(&fnhe_hashrnd, sizeof(fnhe_hashrnd)); |
630 | hval = jhash_1word((__force u32) daddr, fnhe_hashrnd); | |
631 | return hash_32(hval, FNHE_HASH_SHIFT); | |
d3a25c98 DM |
632 | } |
633 | ||
387aa65a TT |
634 | static void fill_route_from_fnhe(struct rtable *rt, struct fib_nh_exception *fnhe) |
635 | { | |
636 | rt->rt_pmtu = fnhe->fnhe_pmtu; | |
637 | rt->dst.expires = fnhe->fnhe_expires; | |
638 | ||
639 | if (fnhe->fnhe_gw) { | |
640 | rt->rt_flags |= RTCF_REDIRECTED; | |
641 | rt->rt_gateway = fnhe->fnhe_gw; | |
642 | rt->rt_uses_gateway = 1; | |
643 | } | |
644 | } | |
645 | ||
aee06da6 JA |
646 | static void update_or_create_fnhe(struct fib_nh *nh, __be32 daddr, __be32 gw, |
647 | u32 pmtu, unsigned long expires) | |
4895c771 | 648 | { |
aee06da6 | 649 | struct fnhe_hash_bucket *hash; |
4895c771 | 650 | struct fib_nh_exception *fnhe; |
387aa65a | 651 | struct rtable *rt; |
cebe84c6 | 652 | u32 genid, hval; |
387aa65a | 653 | unsigned int i; |
4895c771 | 654 | int depth; |
cebe84c6 XL |
655 | |
656 | genid = fnhe_genid(dev_net(nh->nh_dev)); | |
657 | hval = fnhe_hashfun(daddr); | |
aee06da6 | 658 | |
c5038a83 | 659 | spin_lock_bh(&fnhe_lock); |
4895c771 | 660 | |
caa41527 | 661 | hash = rcu_dereference(nh->nh_exceptions); |
4895c771 | 662 | if (!hash) { |
aee06da6 | 663 | hash = kzalloc(FNHE_HASH_SIZE * sizeof(*hash), GFP_ATOMIC); |
4895c771 | 664 | if (!hash) |
aee06da6 | 665 | goto out_unlock; |
caa41527 | 666 | rcu_assign_pointer(nh->nh_exceptions, hash); |
4895c771 DM |
667 | } |
668 | ||
4895c771 DM |
669 | hash += hval; |
670 | ||
671 | depth = 0; | |
672 | for (fnhe = rcu_dereference(hash->chain); fnhe; | |
673 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
674 | if (fnhe->fnhe_daddr == daddr) | |
aee06da6 | 675 | break; |
4895c771 DM |
676 | depth++; |
677 | } | |
678 | ||
aee06da6 | 679 | if (fnhe) { |
cebe84c6 XL |
680 | if (fnhe->fnhe_genid != genid) |
681 | fnhe->fnhe_genid = genid; | |
aee06da6 JA |
682 | if (gw) |
683 | fnhe->fnhe_gw = gw; | |
e39d5246 | 684 | if (pmtu) |
aee06da6 | 685 | fnhe->fnhe_pmtu = pmtu; |
e39d5246 | 686 | fnhe->fnhe_expires = max(1UL, expires); |
387aa65a | 687 | /* Update all cached dsts too */ |
2ffae99d TT |
688 | rt = rcu_dereference(fnhe->fnhe_rth_input); |
689 | if (rt) | |
690 | fill_route_from_fnhe(rt, fnhe); | |
691 | rt = rcu_dereference(fnhe->fnhe_rth_output); | |
387aa65a TT |
692 | if (rt) |
693 | fill_route_from_fnhe(rt, fnhe); | |
aee06da6 JA |
694 | } else { |
695 | if (depth > FNHE_RECLAIM_DEPTH) | |
696 | fnhe = fnhe_oldest(hash); | |
697 | else { | |
698 | fnhe = kzalloc(sizeof(*fnhe), GFP_ATOMIC); | |
699 | if (!fnhe) | |
700 | goto out_unlock; | |
701 | ||
702 | fnhe->fnhe_next = hash->chain; | |
703 | rcu_assign_pointer(hash->chain, fnhe); | |
704 | } | |
cebe84c6 | 705 | fnhe->fnhe_genid = genid; |
aee06da6 JA |
706 | fnhe->fnhe_daddr = daddr; |
707 | fnhe->fnhe_gw = gw; | |
708 | fnhe->fnhe_pmtu = pmtu; | |
709 | fnhe->fnhe_expires = expires; | |
387aa65a TT |
710 | |
711 | /* Exception created; mark the cached routes for the nexthop | |
712 | * stale, so anyone caching it rechecks if this exception | |
713 | * applies to them. | |
714 | */ | |
2ffae99d TT |
715 | rt = rcu_dereference(nh->nh_rth_input); |
716 | if (rt) | |
717 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
718 | ||
387aa65a TT |
719 | for_each_possible_cpu(i) { |
720 | struct rtable __rcu **prt; | |
721 | prt = per_cpu_ptr(nh->nh_pcpu_rth_output, i); | |
722 | rt = rcu_dereference(*prt); | |
723 | if (rt) | |
724 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
725 | } | |
4895c771 | 726 | } |
4895c771 | 727 | |
4895c771 | 728 | fnhe->fnhe_stamp = jiffies; |
aee06da6 JA |
729 | |
730 | out_unlock: | |
c5038a83 | 731 | spin_unlock_bh(&fnhe_lock); |
4895c771 DM |
732 | } |
733 | ||
ceb33206 DM |
734 | static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flowi4 *fl4, |
735 | bool kill_route) | |
1da177e4 | 736 | { |
e47a185b | 737 | __be32 new_gw = icmp_hdr(skb)->un.gateway; |
94206125 | 738 | __be32 old_gw = ip_hdr(skb)->saddr; |
e47a185b | 739 | struct net_device *dev = skb->dev; |
e47a185b | 740 | struct in_device *in_dev; |
4895c771 | 741 | struct fib_result res; |
e47a185b | 742 | struct neighbour *n; |
317805b8 | 743 | struct net *net; |
1da177e4 | 744 | |
94206125 DM |
745 | switch (icmp_hdr(skb)->code & 7) { |
746 | case ICMP_REDIR_NET: | |
747 | case ICMP_REDIR_NETTOS: | |
748 | case ICMP_REDIR_HOST: | |
749 | case ICMP_REDIR_HOSTTOS: | |
750 | break; | |
751 | ||
752 | default: | |
753 | return; | |
754 | } | |
755 | ||
e47a185b DM |
756 | if (rt->rt_gateway != old_gw) |
757 | return; | |
758 | ||
759 | in_dev = __in_dev_get_rcu(dev); | |
760 | if (!in_dev) | |
761 | return; | |
762 | ||
c346dca1 | 763 | net = dev_net(dev); |
9d4fb27d JP |
764 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) || |
765 | ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) || | |
766 | ipv4_is_zeronet(new_gw)) | |
1da177e4 LT |
767 | goto reject_redirect; |
768 | ||
769 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { | |
770 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) | |
771 | goto reject_redirect; | |
772 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) | |
773 | goto reject_redirect; | |
774 | } else { | |
317805b8 | 775 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
1da177e4 LT |
776 | goto reject_redirect; |
777 | } | |
778 | ||
969447f2 SSL |
779 | n = __ipv4_neigh_lookup(rt->dst.dev, new_gw); |
780 | if (!n) | |
781 | n = neigh_create(&arp_tbl, &new_gw, rt->dst.dev); | |
2c1a4311 | 782 | if (!IS_ERR(n)) { |
e47a185b DM |
783 | if (!(n->nud_state & NUD_VALID)) { |
784 | neigh_event_send(n, NULL); | |
785 | } else { | |
0eeb075f | 786 | if (fib_lookup(net, fl4, &res, 0) == 0) { |
4895c771 | 787 | struct fib_nh *nh = &FIB_RES_NH(res); |
4895c771 | 788 | |
aee06da6 | 789 | update_or_create_fnhe(nh, fl4->daddr, new_gw, |
deed49df | 790 | 0, jiffies + ip_rt_gc_timeout); |
4895c771 | 791 | } |
ceb33206 DM |
792 | if (kill_route) |
793 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
e47a185b DM |
794 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n); |
795 | } | |
796 | neigh_release(n); | |
797 | } | |
798 | return; | |
799 | ||
800 | reject_redirect: | |
801 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
99ee038d DM |
802 | if (IN_DEV_LOG_MARTIANS(in_dev)) { |
803 | const struct iphdr *iph = (const struct iphdr *) skb->data; | |
804 | __be32 daddr = iph->daddr; | |
805 | __be32 saddr = iph->saddr; | |
806 | ||
e47a185b DM |
807 | net_info_ratelimited("Redirect from %pI4 on %s about %pI4 ignored\n" |
808 | " Advised path = %pI4 -> %pI4\n", | |
809 | &old_gw, dev->name, &new_gw, | |
810 | &saddr, &daddr); | |
99ee038d | 811 | } |
e47a185b DM |
812 | #endif |
813 | ; | |
814 | } | |
815 | ||
4895c771 DM |
816 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
817 | { | |
818 | struct rtable *rt; | |
819 | struct flowi4 fl4; | |
f96ef988 | 820 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
7d995694 | 821 | struct net *net = dev_net(skb->dev); |
f96ef988 MK |
822 | int oif = skb->dev->ifindex; |
823 | u8 tos = RT_TOS(iph->tos); | |
824 | u8 prot = iph->protocol; | |
825 | u32 mark = skb->mark; | |
4895c771 DM |
826 | |
827 | rt = (struct rtable *) dst; | |
828 | ||
7d995694 | 829 | __build_flow_key(net, &fl4, sk, iph, oif, tos, prot, mark, 0); |
ceb33206 | 830 | __ip_do_redirect(rt, skb, &fl4, true); |
4895c771 DM |
831 | } |
832 | ||
1da177e4 LT |
833 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) |
834 | { | |
ee6b9673 | 835 | struct rtable *rt = (struct rtable *)dst; |
1da177e4 LT |
836 | struct dst_entry *ret = dst; |
837 | ||
838 | if (rt) { | |
d11a4dc1 | 839 | if (dst->obsolete > 0) { |
1da177e4 LT |
840 | ip_rt_put(rt); |
841 | ret = NULL; | |
5943634f DM |
842 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || |
843 | rt->dst.expires) { | |
89aef892 | 844 | ip_rt_put(rt); |
1da177e4 LT |
845 | ret = NULL; |
846 | } | |
847 | } | |
848 | return ret; | |
849 | } | |
850 | ||
851 | /* | |
852 | * Algorithm: | |
853 | * 1. The first ip_rt_redirect_number redirects are sent | |
854 | * with exponential backoff, then we stop sending them at all, | |
855 | * assuming that the host ignores our redirects. | |
856 | * 2. If we did not see packets requiring redirects | |
857 | * during ip_rt_redirect_silence, we assume that the host | |
858 | * forgot redirected route and start to send redirects again. | |
859 | * | |
860 | * This algorithm is much cheaper and more intelligent than dumb load limiting | |
861 | * in icmp.c. | |
862 | * | |
863 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) | |
864 | * and "frag. need" (breaks PMTU discovery) in icmp.c. | |
865 | */ | |
866 | ||
867 | void ip_rt_send_redirect(struct sk_buff *skb) | |
868 | { | |
511c3f92 | 869 | struct rtable *rt = skb_rtable(skb); |
30038fc6 | 870 | struct in_device *in_dev; |
92d86829 | 871 | struct inet_peer *peer; |
1d861aa4 | 872 | struct net *net; |
30038fc6 | 873 | int log_martians; |
192132b9 | 874 | int vif; |
1da177e4 | 875 | |
30038fc6 | 876 | rcu_read_lock(); |
d8d1f30b | 877 | in_dev = __in_dev_get_rcu(rt->dst.dev); |
30038fc6 ED |
878 | if (!in_dev || !IN_DEV_TX_REDIRECTS(in_dev)) { |
879 | rcu_read_unlock(); | |
1da177e4 | 880 | return; |
30038fc6 ED |
881 | } |
882 | log_martians = IN_DEV_LOG_MARTIANS(in_dev); | |
385add90 | 883 | vif = l3mdev_master_ifindex_rcu(rt->dst.dev); |
30038fc6 | 884 | rcu_read_unlock(); |
1da177e4 | 885 | |
1d861aa4 | 886 | net = dev_net(rt->dst.dev); |
192132b9 | 887 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, vif, 1); |
92d86829 | 888 | if (!peer) { |
e81da0e1 JA |
889 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, |
890 | rt_nexthop(rt, ip_hdr(skb)->daddr)); | |
92d86829 DM |
891 | return; |
892 | } | |
893 | ||
1da177e4 LT |
894 | /* No redirected packets during ip_rt_redirect_silence; |
895 | * reset the algorithm. | |
896 | */ | |
92d86829 DM |
897 | if (time_after(jiffies, peer->rate_last + ip_rt_redirect_silence)) |
898 | peer->rate_tokens = 0; | |
1da177e4 LT |
899 | |
900 | /* Too many ignored redirects; do not send anything | |
d8d1f30b | 901 | * set dst.rate_last to the last seen redirected packet. |
1da177e4 | 902 | */ |
92d86829 DM |
903 | if (peer->rate_tokens >= ip_rt_redirect_number) { |
904 | peer->rate_last = jiffies; | |
1d861aa4 | 905 | goto out_put_peer; |
1da177e4 LT |
906 | } |
907 | ||
908 | /* Check for load limit; set rate_last to the latest sent | |
909 | * redirect. | |
910 | */ | |
92d86829 | 911 | if (peer->rate_tokens == 0 || |
14fb8a76 | 912 | time_after(jiffies, |
92d86829 DM |
913 | (peer->rate_last + |
914 | (ip_rt_redirect_load << peer->rate_tokens)))) { | |
e81da0e1 JA |
915 | __be32 gw = rt_nexthop(rt, ip_hdr(skb)->daddr); |
916 | ||
917 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, gw); | |
92d86829 DM |
918 | peer->rate_last = jiffies; |
919 | ++peer->rate_tokens; | |
1da177e4 | 920 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
30038fc6 | 921 | if (log_martians && |
e87cc472 JP |
922 | peer->rate_tokens == ip_rt_redirect_number) |
923 | net_warn_ratelimited("host %pI4/if%d ignores redirects for %pI4 to %pI4\n", | |
92101b3b | 924 | &ip_hdr(skb)->saddr, inet_iif(skb), |
e81da0e1 | 925 | &ip_hdr(skb)->daddr, &gw); |
1da177e4 LT |
926 | #endif |
927 | } | |
1d861aa4 DM |
928 | out_put_peer: |
929 | inet_putpeer(peer); | |
1da177e4 LT |
930 | } |
931 | ||
932 | static int ip_error(struct sk_buff *skb) | |
933 | { | |
251da413 | 934 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
511c3f92 | 935 | struct rtable *rt = skb_rtable(skb); |
92d86829 | 936 | struct inet_peer *peer; |
1da177e4 | 937 | unsigned long now; |
251da413 | 938 | struct net *net; |
92d86829 | 939 | bool send; |
1da177e4 LT |
940 | int code; |
941 | ||
381c759d EB |
942 | /* IP on this device is disabled. */ |
943 | if (!in_dev) | |
944 | goto out; | |
945 | ||
251da413 DM |
946 | net = dev_net(rt->dst.dev); |
947 | if (!IN_DEV_FORWARD(in_dev)) { | |
948 | switch (rt->dst.error) { | |
949 | case EHOSTUNREACH: | |
b45386ef | 950 | __IP_INC_STATS(net, IPSTATS_MIB_INADDRERRORS); |
251da413 DM |
951 | break; |
952 | ||
953 | case ENETUNREACH: | |
b45386ef | 954 | __IP_INC_STATS(net, IPSTATS_MIB_INNOROUTES); |
251da413 DM |
955 | break; |
956 | } | |
957 | goto out; | |
958 | } | |
959 | ||
d8d1f30b | 960 | switch (rt->dst.error) { |
4500ebf8 JP |
961 | case EINVAL: |
962 | default: | |
963 | goto out; | |
964 | case EHOSTUNREACH: | |
965 | code = ICMP_HOST_UNREACH; | |
966 | break; | |
967 | case ENETUNREACH: | |
968 | code = ICMP_NET_UNREACH; | |
b45386ef | 969 | __IP_INC_STATS(net, IPSTATS_MIB_INNOROUTES); |
4500ebf8 JP |
970 | break; |
971 | case EACCES: | |
972 | code = ICMP_PKT_FILTERED; | |
973 | break; | |
1da177e4 LT |
974 | } |
975 | ||
192132b9 | 976 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, |
385add90 | 977 | l3mdev_master_ifindex(skb->dev), 1); |
92d86829 DM |
978 | |
979 | send = true; | |
980 | if (peer) { | |
981 | now = jiffies; | |
982 | peer->rate_tokens += now - peer->rate_last; | |
983 | if (peer->rate_tokens > ip_rt_error_burst) | |
984 | peer->rate_tokens = ip_rt_error_burst; | |
985 | peer->rate_last = now; | |
986 | if (peer->rate_tokens >= ip_rt_error_cost) | |
987 | peer->rate_tokens -= ip_rt_error_cost; | |
988 | else | |
989 | send = false; | |
1d861aa4 | 990 | inet_putpeer(peer); |
1da177e4 | 991 | } |
92d86829 DM |
992 | if (send) |
993 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); | |
1da177e4 LT |
994 | |
995 | out: kfree_skb(skb); | |
996 | return 0; | |
e905a9ed | 997 | } |
1da177e4 | 998 | |
d851c12b | 999 | static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu) |
1da177e4 | 1000 | { |
d851c12b | 1001 | struct dst_entry *dst = &rt->dst; |
4895c771 | 1002 | struct fib_result res; |
2c8cec5c | 1003 | |
fa1e492a SK |
1004 | if (dst_metric_locked(dst, RTAX_MTU)) |
1005 | return; | |
1006 | ||
cb6ccf09 | 1007 | if (ipv4_mtu(dst) < mtu) |
3cdaa5be LW |
1008 | return; |
1009 | ||
5943634f DM |
1010 | if (mtu < ip_rt_min_pmtu) |
1011 | mtu = ip_rt_min_pmtu; | |
2c8cec5c | 1012 | |
f016229e TT |
1013 | if (rt->rt_pmtu == mtu && |
1014 | time_before(jiffies, dst->expires - ip_rt_mtu_expires / 2)) | |
1015 | return; | |
1016 | ||
c5ae7d41 | 1017 | rcu_read_lock(); |
0eeb075f | 1018 | if (fib_lookup(dev_net(dst->dev), fl4, &res, 0) == 0) { |
4895c771 | 1019 | struct fib_nh *nh = &FIB_RES_NH(res); |
4895c771 | 1020 | |
aee06da6 JA |
1021 | update_or_create_fnhe(nh, fl4->daddr, 0, mtu, |
1022 | jiffies + ip_rt_mtu_expires); | |
4895c771 | 1023 | } |
c5ae7d41 | 1024 | rcu_read_unlock(); |
1da177e4 LT |
1025 | } |
1026 | ||
4895c771 DM |
1027 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1028 | struct sk_buff *skb, u32 mtu) | |
1029 | { | |
1030 | struct rtable *rt = (struct rtable *) dst; | |
1031 | struct flowi4 fl4; | |
1032 | ||
1033 | ip_rt_build_flow_key(&fl4, sk, skb); | |
d851c12b | 1034 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
4895c771 DM |
1035 | } |
1036 | ||
36393395 DM |
1037 | void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, |
1038 | int oif, u32 mark, u8 protocol, int flow_flags) | |
1039 | { | |
4895c771 | 1040 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
36393395 DM |
1041 | struct flowi4 fl4; |
1042 | struct rtable *rt; | |
1043 | ||
1b3c61dc LC |
1044 | if (!mark) |
1045 | mark = IP4_REPLY_MARK(net, skb->mark); | |
1046 | ||
e2d118a1 | 1047 | __build_flow_key(net, &fl4, NULL, iph, oif, |
4895c771 | 1048 | RT_TOS(iph->tos), protocol, mark, flow_flags); |
36393395 DM |
1049 | rt = __ip_route_output_key(net, &fl4); |
1050 | if (!IS_ERR(rt)) { | |
4895c771 | 1051 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
36393395 DM |
1052 | ip_rt_put(rt); |
1053 | } | |
1054 | } | |
1055 | EXPORT_SYMBOL_GPL(ipv4_update_pmtu); | |
1056 | ||
9cb3a50c | 1057 | static void __ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) |
36393395 | 1058 | { |
4895c771 DM |
1059 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
1060 | struct flowi4 fl4; | |
1061 | struct rtable *rt; | |
36393395 | 1062 | |
e2d118a1 | 1063 | __build_flow_key(sock_net(sk), &fl4, sk, iph, 0, 0, 0, 0, 0); |
1b3c61dc LC |
1064 | |
1065 | if (!fl4.flowi4_mark) | |
1066 | fl4.flowi4_mark = IP4_REPLY_MARK(sock_net(sk), skb->mark); | |
1067 | ||
4895c771 DM |
1068 | rt = __ip_route_output_key(sock_net(sk), &fl4); |
1069 | if (!IS_ERR(rt)) { | |
1070 | __ip_rt_update_pmtu(rt, &fl4, mtu); | |
1071 | ip_rt_put(rt); | |
1072 | } | |
36393395 | 1073 | } |
9cb3a50c SK |
1074 | |
1075 | void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) | |
1076 | { | |
1077 | const struct iphdr *iph = (const struct iphdr *) skb->data; | |
1078 | struct flowi4 fl4; | |
1079 | struct rtable *rt; | |
7f502361 | 1080 | struct dst_entry *odst = NULL; |
b44108db | 1081 | bool new = false; |
e2d118a1 | 1082 | struct net *net = sock_net(sk); |
9cb3a50c SK |
1083 | |
1084 | bh_lock_sock(sk); | |
482fc609 HFS |
1085 | |
1086 | if (!ip_sk_accept_pmtu(sk)) | |
1087 | goto out; | |
1088 | ||
7f502361 | 1089 | odst = sk_dst_get(sk); |
9cb3a50c | 1090 | |
7f502361 | 1091 | if (sock_owned_by_user(sk) || !odst) { |
9cb3a50c SK |
1092 | __ipv4_sk_update_pmtu(skb, sk, mtu); |
1093 | goto out; | |
1094 | } | |
1095 | ||
e2d118a1 | 1096 | __build_flow_key(net, &fl4, sk, iph, 0, 0, 0, 0, 0); |
9cb3a50c | 1097 | |
7f502361 | 1098 | rt = (struct rtable *)odst; |
51456b29 | 1099 | if (odst->obsolete && !odst->ops->check(odst, 0)) { |
9cb3a50c SK |
1100 | rt = ip_route_output_flow(sock_net(sk), &fl4, sk); |
1101 | if (IS_ERR(rt)) | |
1102 | goto out; | |
b44108db SK |
1103 | |
1104 | new = true; | |
9cb3a50c SK |
1105 | } |
1106 | ||
0f6c480f | 1107 | __ip_rt_update_pmtu((struct rtable *) xfrm_dst_path(&rt->dst), &fl4, mtu); |
9cb3a50c | 1108 | |
7f502361 | 1109 | if (!dst_check(&rt->dst, 0)) { |
b44108db SK |
1110 | if (new) |
1111 | dst_release(&rt->dst); | |
1112 | ||
9cb3a50c SK |
1113 | rt = ip_route_output_flow(sock_net(sk), &fl4, sk); |
1114 | if (IS_ERR(rt)) | |
1115 | goto out; | |
1116 | ||
b44108db | 1117 | new = true; |
9cb3a50c SK |
1118 | } |
1119 | ||
b44108db | 1120 | if (new) |
7f502361 | 1121 | sk_dst_set(sk, &rt->dst); |
9cb3a50c SK |
1122 | |
1123 | out: | |
1124 | bh_unlock_sock(sk); | |
7f502361 | 1125 | dst_release(odst); |
9cb3a50c | 1126 | } |
36393395 | 1127 | EXPORT_SYMBOL_GPL(ipv4_sk_update_pmtu); |
f39925db | 1128 | |
b42597e2 DM |
1129 | void ipv4_redirect(struct sk_buff *skb, struct net *net, |
1130 | int oif, u32 mark, u8 protocol, int flow_flags) | |
1131 | { | |
4895c771 | 1132 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
b42597e2 DM |
1133 | struct flowi4 fl4; |
1134 | struct rtable *rt; | |
1135 | ||
e2d118a1 | 1136 | __build_flow_key(net, &fl4, NULL, iph, oif, |
4895c771 | 1137 | RT_TOS(iph->tos), protocol, mark, flow_flags); |
b42597e2 DM |
1138 | rt = __ip_route_output_key(net, &fl4); |
1139 | if (!IS_ERR(rt)) { | |
ceb33206 | 1140 | __ip_do_redirect(rt, skb, &fl4, false); |
b42597e2 DM |
1141 | ip_rt_put(rt); |
1142 | } | |
1143 | } | |
1144 | EXPORT_SYMBOL_GPL(ipv4_redirect); | |
1145 | ||
1146 | void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk) | |
1147 | { | |
4895c771 DM |
1148 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
1149 | struct flowi4 fl4; | |
1150 | struct rtable *rt; | |
e2d118a1 | 1151 | struct net *net = sock_net(sk); |
b42597e2 | 1152 | |
e2d118a1 LC |
1153 | __build_flow_key(net, &fl4, sk, iph, 0, 0, 0, 0, 0); |
1154 | rt = __ip_route_output_key(net, &fl4); | |
4895c771 | 1155 | if (!IS_ERR(rt)) { |
ceb33206 | 1156 | __ip_do_redirect(rt, skb, &fl4, false); |
4895c771 DM |
1157 | ip_rt_put(rt); |
1158 | } | |
b42597e2 DM |
1159 | } |
1160 | EXPORT_SYMBOL_GPL(ipv4_sk_redirect); | |
1161 | ||
efbc368d DM |
1162 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) |
1163 | { | |
1164 | struct rtable *rt = (struct rtable *) dst; | |
1165 | ||
ceb33206 DM |
1166 | /* All IPV4 dsts are created with ->obsolete set to the value |
1167 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1168 | * into this function always. | |
1169 | * | |
387aa65a TT |
1170 | * When a PMTU/redirect information update invalidates a route, |
1171 | * this is indicated by setting obsolete to DST_OBSOLETE_KILL or | |
1172 | * DST_OBSOLETE_DEAD by dst_free(). | |
ceb33206 | 1173 | */ |
387aa65a | 1174 | if (dst->obsolete != DST_OBSOLETE_FORCE_CHK || rt_is_expired(rt)) |
efbc368d | 1175 | return NULL; |
d11a4dc1 | 1176 | return dst; |
1da177e4 LT |
1177 | } |
1178 | ||
1da177e4 LT |
1179 | static void ipv4_link_failure(struct sk_buff *skb) |
1180 | { | |
1181 | struct rtable *rt; | |
1182 | ||
1183 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); | |
1184 | ||
511c3f92 | 1185 | rt = skb_rtable(skb); |
5943634f DM |
1186 | if (rt) |
1187 | dst_set_expires(&rt->dst, 0); | |
1da177e4 LT |
1188 | } |
1189 | ||
ede2059d | 1190 | static int ip_rt_bug(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1191 | { |
91df42be JP |
1192 | pr_debug("%s: %pI4 -> %pI4, %s\n", |
1193 | __func__, &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, | |
1194 | skb->dev ? skb->dev->name : "?"); | |
1da177e4 | 1195 | kfree_skb(skb); |
c378a9c0 | 1196 | WARN_ON(1); |
1da177e4 LT |
1197 | return 0; |
1198 | } | |
1199 | ||
1200 | /* | |
1201 | We do not cache source address of outgoing interface, | |
1202 | because it is used only by IP RR, TS and SRR options, | |
1203 | so that it out of fast path. | |
1204 | ||
1205 | BTW remember: "addr" is allowed to be not aligned | |
1206 | in IP options! | |
1207 | */ | |
1208 | ||
8e36360a | 1209 | void ip_rt_get_source(u8 *addr, struct sk_buff *skb, struct rtable *rt) |
1da177e4 | 1210 | { |
a61ced5d | 1211 | __be32 src; |
1da177e4 | 1212 | |
c7537967 | 1213 | if (rt_is_output_route(rt)) |
c5be24ff | 1214 | src = ip_hdr(skb)->saddr; |
ebc0ffae | 1215 | else { |
8e36360a DM |
1216 | struct fib_result res; |
1217 | struct flowi4 fl4; | |
1218 | struct iphdr *iph; | |
1219 | ||
1220 | iph = ip_hdr(skb); | |
1221 | ||
1222 | memset(&fl4, 0, sizeof(fl4)); | |
1223 | fl4.daddr = iph->daddr; | |
1224 | fl4.saddr = iph->saddr; | |
b0fe4a31 | 1225 | fl4.flowi4_tos = RT_TOS(iph->tos); |
8e36360a DM |
1226 | fl4.flowi4_oif = rt->dst.dev->ifindex; |
1227 | fl4.flowi4_iif = skb->dev->ifindex; | |
1228 | fl4.flowi4_mark = skb->mark; | |
5e2b61f7 | 1229 | |
ebc0ffae | 1230 | rcu_read_lock(); |
0eeb075f | 1231 | if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res, 0) == 0) |
436c3b66 | 1232 | src = FIB_RES_PREFSRC(dev_net(rt->dst.dev), res); |
ebc0ffae | 1233 | else |
f8126f1d DM |
1234 | src = inet_select_addr(rt->dst.dev, |
1235 | rt_nexthop(rt, iph->daddr), | |
1236 | RT_SCOPE_UNIVERSE); | |
ebc0ffae ED |
1237 | rcu_read_unlock(); |
1238 | } | |
1da177e4 LT |
1239 | memcpy(addr, &src, 4); |
1240 | } | |
1241 | ||
c7066f70 | 1242 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
1243 | static void set_class_tag(struct rtable *rt, u32 tag) |
1244 | { | |
d8d1f30b CG |
1245 | if (!(rt->dst.tclassid & 0xFFFF)) |
1246 | rt->dst.tclassid |= tag & 0xFFFF; | |
1247 | if (!(rt->dst.tclassid & 0xFFFF0000)) | |
1248 | rt->dst.tclassid |= tag & 0xFFFF0000; | |
1da177e4 LT |
1249 | } |
1250 | #endif | |
1251 | ||
0dbaee3b DM |
1252 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst) |
1253 | { | |
7ed14d97 | 1254 | unsigned int header_size = sizeof(struct tcphdr) + sizeof(struct iphdr); |
164a5e7a | 1255 | unsigned int advmss = max_t(unsigned int, ipv4_mtu(dst) - header_size, |
7ed14d97 | 1256 | ip_rt_min_advmss); |
0dbaee3b | 1257 | |
7ed14d97 | 1258 | return min(advmss, IPV4_MAX_PMTU - header_size); |
0dbaee3b DM |
1259 | } |
1260 | ||
ebb762f2 | 1261 | static unsigned int ipv4_mtu(const struct dst_entry *dst) |
d33e4553 | 1262 | { |
261663b0 | 1263 | const struct rtable *rt = (const struct rtable *) dst; |
5943634f DM |
1264 | unsigned int mtu = rt->rt_pmtu; |
1265 | ||
98d75c37 | 1266 | if (!mtu || time_after_eq(jiffies, rt->dst.expires)) |
5943634f | 1267 | mtu = dst_metric_raw(dst, RTAX_MTU); |
618f9bc7 | 1268 | |
38d523e2 | 1269 | if (mtu) |
618f9bc7 SK |
1270 | return mtu; |
1271 | ||
c780a049 | 1272 | mtu = READ_ONCE(dst->dev->mtu); |
d33e4553 DM |
1273 | |
1274 | if (unlikely(dst_metric_locked(dst, RTAX_MTU))) { | |
155e8336 | 1275 | if (rt->rt_uses_gateway && mtu > 576) |
d33e4553 DM |
1276 | mtu = 576; |
1277 | } | |
1278 | ||
14972cbd RP |
1279 | mtu = min_t(unsigned int, mtu, IP_MAX_MTU); |
1280 | ||
1281 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); | |
d33e4553 DM |
1282 | } |
1283 | ||
f2bb4bed | 1284 | static struct fib_nh_exception *find_exception(struct fib_nh *nh, __be32 daddr) |
4895c771 | 1285 | { |
caa41527 | 1286 | struct fnhe_hash_bucket *hash = rcu_dereference(nh->nh_exceptions); |
4895c771 DM |
1287 | struct fib_nh_exception *fnhe; |
1288 | u32 hval; | |
1289 | ||
f2bb4bed DM |
1290 | if (!hash) |
1291 | return NULL; | |
1292 | ||
d3a25c98 | 1293 | hval = fnhe_hashfun(daddr); |
4895c771 DM |
1294 | |
1295 | for (fnhe = rcu_dereference(hash[hval].chain); fnhe; | |
1296 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
f2bb4bed DM |
1297 | if (fnhe->fnhe_daddr == daddr) |
1298 | return fnhe; | |
1299 | } | |
1300 | return NULL; | |
1301 | } | |
aee06da6 | 1302 | |
caacf05e | 1303 | static bool rt_bind_exception(struct rtable *rt, struct fib_nh_exception *fnhe, |
a4c2fd7f | 1304 | __be32 daddr, const bool do_cache) |
f2bb4bed | 1305 | { |
caacf05e DM |
1306 | bool ret = false; |
1307 | ||
c5038a83 | 1308 | spin_lock_bh(&fnhe_lock); |
f2bb4bed | 1309 | |
c5038a83 | 1310 | if (daddr == fnhe->fnhe_daddr) { |
2ffae99d TT |
1311 | struct rtable __rcu **porig; |
1312 | struct rtable *orig; | |
5aad1de5 | 1313 | int genid = fnhe_genid(dev_net(rt->dst.dev)); |
2ffae99d TT |
1314 | |
1315 | if (rt_is_input_route(rt)) | |
1316 | porig = &fnhe->fnhe_rth_input; | |
1317 | else | |
1318 | porig = &fnhe->fnhe_rth_output; | |
1319 | orig = rcu_dereference(*porig); | |
5aad1de5 TT |
1320 | |
1321 | if (fnhe->fnhe_genid != genid) { | |
1322 | fnhe->fnhe_genid = genid; | |
13d82bf5 SK |
1323 | fnhe->fnhe_gw = 0; |
1324 | fnhe->fnhe_pmtu = 0; | |
1325 | fnhe->fnhe_expires = 0; | |
2ffae99d TT |
1326 | fnhe_flush_routes(fnhe); |
1327 | orig = NULL; | |
13d82bf5 | 1328 | } |
387aa65a TT |
1329 | fill_route_from_fnhe(rt, fnhe); |
1330 | if (!rt->rt_gateway) | |
155e8336 | 1331 | rt->rt_gateway = daddr; |
f2bb4bed | 1332 | |
a4c2fd7f | 1333 | if (do_cache) { |
0830106c | 1334 | dst_hold(&rt->dst); |
2ffae99d | 1335 | rcu_assign_pointer(*porig, rt); |
0830106c | 1336 | if (orig) { |
95c47f9c | 1337 | dst_dev_put(&orig->dst); |
0830106c | 1338 | dst_release(&orig->dst); |
0830106c | 1339 | } |
2ffae99d TT |
1340 | ret = true; |
1341 | } | |
c5038a83 DM |
1342 | |
1343 | fnhe->fnhe_stamp = jiffies; | |
c5038a83 DM |
1344 | } |
1345 | spin_unlock_bh(&fnhe_lock); | |
caacf05e DM |
1346 | |
1347 | return ret; | |
54764bb6 ED |
1348 | } |
1349 | ||
caacf05e | 1350 | static bool rt_cache_route(struct fib_nh *nh, struct rtable *rt) |
f2bb4bed | 1351 | { |
d26b3a7c | 1352 | struct rtable *orig, *prev, **p; |
caacf05e | 1353 | bool ret = true; |
f2bb4bed | 1354 | |
d26b3a7c | 1355 | if (rt_is_input_route(rt)) { |
54764bb6 | 1356 | p = (struct rtable **)&nh->nh_rth_input; |
d26b3a7c | 1357 | } else { |
903ceff7 | 1358 | p = (struct rtable **)raw_cpu_ptr(nh->nh_pcpu_rth_output); |
d26b3a7c | 1359 | } |
f2bb4bed DM |
1360 | orig = *p; |
1361 | ||
0830106c WW |
1362 | /* hold dst before doing cmpxchg() to avoid race condition |
1363 | * on this dst | |
1364 | */ | |
1365 | dst_hold(&rt->dst); | |
f2bb4bed DM |
1366 | prev = cmpxchg(p, orig, rt); |
1367 | if (prev == orig) { | |
0830106c | 1368 | if (orig) { |
95c47f9c | 1369 | dst_dev_put(&orig->dst); |
0830106c | 1370 | dst_release(&orig->dst); |
0830106c WW |
1371 | } |
1372 | } else { | |
1373 | dst_release(&rt->dst); | |
caacf05e | 1374 | ret = false; |
0830106c | 1375 | } |
caacf05e DM |
1376 | |
1377 | return ret; | |
1378 | } | |
1379 | ||
5055c371 ED |
1380 | struct uncached_list { |
1381 | spinlock_t lock; | |
1382 | struct list_head head; | |
1383 | }; | |
1384 | ||
1385 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt_uncached_list); | |
caacf05e DM |
1386 | |
1387 | static void rt_add_uncached_list(struct rtable *rt) | |
1388 | { | |
5055c371 ED |
1389 | struct uncached_list *ul = raw_cpu_ptr(&rt_uncached_list); |
1390 | ||
1391 | rt->rt_uncached_list = ul; | |
1392 | ||
1393 | spin_lock_bh(&ul->lock); | |
1394 | list_add_tail(&rt->rt_uncached, &ul->head); | |
1395 | spin_unlock_bh(&ul->lock); | |
caacf05e DM |
1396 | } |
1397 | ||
1398 | static void ipv4_dst_destroy(struct dst_entry *dst) | |
1399 | { | |
3fb07daf | 1400 | struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst); |
caacf05e DM |
1401 | struct rtable *rt = (struct rtable *) dst; |
1402 | ||
9620fef2 | 1403 | if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt)) |
3fb07daf ED |
1404 | kfree(p); |
1405 | ||
78df76a0 | 1406 | if (!list_empty(&rt->rt_uncached)) { |
5055c371 ED |
1407 | struct uncached_list *ul = rt->rt_uncached_list; |
1408 | ||
1409 | spin_lock_bh(&ul->lock); | |
caacf05e | 1410 | list_del(&rt->rt_uncached); |
5055c371 | 1411 | spin_unlock_bh(&ul->lock); |
caacf05e DM |
1412 | } |
1413 | } | |
1414 | ||
1415 | void rt_flush_dev(struct net_device *dev) | |
1416 | { | |
5055c371 ED |
1417 | struct net *net = dev_net(dev); |
1418 | struct rtable *rt; | |
1419 | int cpu; | |
1420 | ||
1421 | for_each_possible_cpu(cpu) { | |
1422 | struct uncached_list *ul = &per_cpu(rt_uncached_list, cpu); | |
caacf05e | 1423 | |
5055c371 ED |
1424 | spin_lock_bh(&ul->lock); |
1425 | list_for_each_entry(rt, &ul->head, rt_uncached) { | |
caacf05e DM |
1426 | if (rt->dst.dev != dev) |
1427 | continue; | |
1428 | rt->dst.dev = net->loopback_dev; | |
1429 | dev_hold(rt->dst.dev); | |
1430 | dev_put(dev); | |
1431 | } | |
5055c371 | 1432 | spin_unlock_bh(&ul->lock); |
4895c771 DM |
1433 | } |
1434 | } | |
1435 | ||
4331debc | 1436 | static bool rt_cache_valid(const struct rtable *rt) |
d2d68ba9 | 1437 | { |
4331debc ED |
1438 | return rt && |
1439 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
1440 | !rt_is_expired(rt); | |
d2d68ba9 DM |
1441 | } |
1442 | ||
f2bb4bed | 1443 | static void rt_set_nexthop(struct rtable *rt, __be32 daddr, |
5e2b61f7 | 1444 | const struct fib_result *res, |
f2bb4bed | 1445 | struct fib_nh_exception *fnhe, |
a4c2fd7f WW |
1446 | struct fib_info *fi, u16 type, u32 itag, |
1447 | const bool do_cache) | |
1da177e4 | 1448 | { |
caacf05e DM |
1449 | bool cached = false; |
1450 | ||
1da177e4 | 1451 | if (fi) { |
4895c771 DM |
1452 | struct fib_nh *nh = &FIB_RES_NH(*res); |
1453 | ||
155e8336 | 1454 | if (nh->nh_gw && nh->nh_scope == RT_SCOPE_LINK) { |
4895c771 | 1455 | rt->rt_gateway = nh->nh_gw; |
155e8336 JA |
1456 | rt->rt_uses_gateway = 1; |
1457 | } | |
3fb07daf ED |
1458 | dst_init_metrics(&rt->dst, fi->fib_metrics->metrics, true); |
1459 | if (fi->fib_metrics != &dst_default_metrics) { | |
1460 | rt->dst._metrics |= DST_METRICS_REFCOUNTED; | |
9620fef2 | 1461 | refcount_inc(&fi->fib_metrics->refcnt); |
3fb07daf | 1462 | } |
c7066f70 | 1463 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f2bb4bed | 1464 | rt->dst.tclassid = nh->nh_tclassid; |
1da177e4 | 1465 | #endif |
61adedf3 | 1466 | rt->dst.lwtstate = lwtstate_get(nh->nh_lwtstate); |
c5038a83 | 1467 | if (unlikely(fnhe)) |
a4c2fd7f WW |
1468 | cached = rt_bind_exception(rt, fnhe, daddr, do_cache); |
1469 | else if (do_cache) | |
caacf05e | 1470 | cached = rt_cache_route(nh, rt); |
155e8336 JA |
1471 | if (unlikely(!cached)) { |
1472 | /* Routes we intend to cache in nexthop exception or | |
1473 | * FIB nexthop have the DST_NOCACHE bit clear. | |
1474 | * However, if we are unsuccessful at storing this | |
1475 | * route into the cache we really need to set it. | |
1476 | */ | |
155e8336 JA |
1477 | if (!rt->rt_gateway) |
1478 | rt->rt_gateway = daddr; | |
1479 | rt_add_uncached_list(rt); | |
1480 | } | |
1481 | } else | |
caacf05e | 1482 | rt_add_uncached_list(rt); |
defb3519 | 1483 | |
c7066f70 | 1484 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 | 1485 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
85b91b03 | 1486 | set_class_tag(rt, res->tclassid); |
1da177e4 LT |
1487 | #endif |
1488 | set_class_tag(rt, itag); | |
1489 | #endif | |
1da177e4 LT |
1490 | } |
1491 | ||
9ab179d8 DA |
1492 | struct rtable *rt_dst_alloc(struct net_device *dev, |
1493 | unsigned int flags, u16 type, | |
1494 | bool nopolicy, bool noxfrm, bool will_cache) | |
0c4dcd58 | 1495 | { |
d08c4f35 DA |
1496 | struct rtable *rt; |
1497 | ||
1498 | rt = dst_alloc(&ipv4_dst_ops, dev, 1, DST_OBSOLETE_FORCE_CHK, | |
a4c2fd7f | 1499 | (will_cache ? 0 : DST_HOST) | |
d08c4f35 | 1500 | (nopolicy ? DST_NOPOLICY : 0) | |
b2a9c0ed | 1501 | (noxfrm ? DST_NOXFRM : 0)); |
d08c4f35 DA |
1502 | |
1503 | if (rt) { | |
1504 | rt->rt_genid = rt_genid_ipv4(dev_net(dev)); | |
1505 | rt->rt_flags = flags; | |
1506 | rt->rt_type = type; | |
1507 | rt->rt_is_input = 0; | |
1508 | rt->rt_iif = 0; | |
1509 | rt->rt_pmtu = 0; | |
1510 | rt->rt_gateway = 0; | |
1511 | rt->rt_uses_gateway = 0; | |
1512 | INIT_LIST_HEAD(&rt->rt_uncached); | |
1513 | ||
1514 | rt->dst.output = ip_output; | |
1515 | if (flags & RTCF_LOCAL) | |
1516 | rt->dst.input = ip_local_deliver; | |
1517 | } | |
1518 | ||
1519 | return rt; | |
0c4dcd58 | 1520 | } |
9ab179d8 | 1521 | EXPORT_SYMBOL(rt_dst_alloc); |
0c4dcd58 | 1522 | |
96d36220 | 1523 | /* called in rcu_read_lock() section */ |
bc044e8d PA |
1524 | int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1525 | u8 tos, struct net_device *dev, | |
1526 | struct in_device *in_dev, u32 *itag) | |
1da177e4 | 1527 | { |
b5f7e755 | 1528 | int err; |
1da177e4 LT |
1529 | |
1530 | /* Primary sanity checks. */ | |
51456b29 | 1531 | if (!in_dev) |
1da177e4 LT |
1532 | return -EINVAL; |
1533 | ||
1e637c74 | 1534 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
d0daebc3 | 1535 | skb->protocol != htons(ETH_P_IP)) |
bc044e8d | 1536 | return -EINVAL; |
1da177e4 | 1537 | |
75fea73d | 1538 | if (ipv4_is_loopback(saddr) && !IN_DEV_ROUTE_LOCALNET(in_dev)) |
bc044e8d | 1539 | return -EINVAL; |
d0daebc3 | 1540 | |
f97c1e0c JP |
1541 | if (ipv4_is_zeronet(saddr)) { |
1542 | if (!ipv4_is_local_multicast(daddr)) | |
bc044e8d | 1543 | return -EINVAL; |
b5f7e755 | 1544 | } else { |
9e56e380 | 1545 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
bc044e8d | 1546 | in_dev, itag); |
b5f7e755 | 1547 | if (err < 0) |
bc044e8d | 1548 | return err; |
b5f7e755 | 1549 | } |
bc044e8d PA |
1550 | return 0; |
1551 | } | |
1552 | ||
1553 | /* called in rcu_read_lock() section */ | |
1554 | static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, | |
1555 | u8 tos, struct net_device *dev, int our) | |
1556 | { | |
1557 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
1558 | unsigned int flags = RTCF_MULTICAST; | |
1559 | struct rtable *rth; | |
1560 | u32 itag = 0; | |
1561 | int err; | |
1562 | ||
1563 | err = ip_mc_validate_source(skb, daddr, saddr, tos, dev, in_dev, &itag); | |
1564 | if (err) | |
1565 | return err; | |
1566 | ||
d08c4f35 DA |
1567 | if (our) |
1568 | flags |= RTCF_LOCAL; | |
1569 | ||
1570 | rth = rt_dst_alloc(dev_net(dev)->loopback_dev, flags, RTN_MULTICAST, | |
f2bb4bed | 1571 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false, false); |
1da177e4 | 1572 | if (!rth) |
bc044e8d | 1573 | return -ENOBUFS; |
1da177e4 | 1574 | |
cf911662 DM |
1575 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1576 | rth->dst.tclassid = itag; | |
1577 | #endif | |
d8d1f30b | 1578 | rth->dst.output = ip_rt_bug; |
9917e1e8 | 1579 | rth->rt_is_input= 1; |
1da177e4 LT |
1580 | |
1581 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c | 1582 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
d8d1f30b | 1583 | rth->dst.input = ip_mr_input; |
1da177e4 LT |
1584 | #endif |
1585 | RT_CACHE_STAT_INC(in_slow_mc); | |
1586 | ||
89aef892 DM |
1587 | skb_dst_set(skb, &rth->dst); |
1588 | return 0; | |
1da177e4 LT |
1589 | } |
1590 | ||
1591 | ||
1592 | static void ip_handle_martian_source(struct net_device *dev, | |
1593 | struct in_device *in_dev, | |
1594 | struct sk_buff *skb, | |
9e12bb22 AV |
1595 | __be32 daddr, |
1596 | __be32 saddr) | |
1da177e4 LT |
1597 | { |
1598 | RT_CACHE_STAT_INC(in_martian_src); | |
1599 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1600 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { | |
1601 | /* | |
1602 | * RFC1812 recommendation, if source is martian, | |
1603 | * the only hint is MAC header. | |
1604 | */ | |
058bd4d2 | 1605 | pr_warn("martian source %pI4 from %pI4, on dev %s\n", |
673d57e7 | 1606 | &daddr, &saddr, dev->name); |
98e399f8 | 1607 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
058bd4d2 JP |
1608 | print_hex_dump(KERN_WARNING, "ll header: ", |
1609 | DUMP_PREFIX_OFFSET, 16, 1, | |
1610 | skb_mac_header(skb), | |
1611 | dev->hard_header_len, true); | |
1da177e4 LT |
1612 | } |
1613 | } | |
1614 | #endif | |
1615 | } | |
1616 | ||
deed49df XL |
1617 | static void ip_del_fnhe(struct fib_nh *nh, __be32 daddr) |
1618 | { | |
1619 | struct fnhe_hash_bucket *hash; | |
1620 | struct fib_nh_exception *fnhe, __rcu **fnhe_p; | |
1621 | u32 hval = fnhe_hashfun(daddr); | |
1622 | ||
1623 | spin_lock_bh(&fnhe_lock); | |
1624 | ||
1625 | hash = rcu_dereference_protected(nh->nh_exceptions, | |
1626 | lockdep_is_held(&fnhe_lock)); | |
1627 | hash += hval; | |
1628 | ||
1629 | fnhe_p = &hash->chain; | |
1630 | fnhe = rcu_dereference_protected(*fnhe_p, lockdep_is_held(&fnhe_lock)); | |
1631 | while (fnhe) { | |
1632 | if (fnhe->fnhe_daddr == daddr) { | |
1633 | rcu_assign_pointer(*fnhe_p, rcu_dereference_protected( | |
1634 | fnhe->fnhe_next, lockdep_is_held(&fnhe_lock))); | |
1635 | fnhe_flush_routes(fnhe); | |
1636 | kfree_rcu(fnhe, rcu); | |
1637 | break; | |
1638 | } | |
1639 | fnhe_p = &fnhe->fnhe_next; | |
1640 | fnhe = rcu_dereference_protected(fnhe->fnhe_next, | |
1641 | lockdep_is_held(&fnhe_lock)); | |
1642 | } | |
1643 | ||
1644 | spin_unlock_bh(&fnhe_lock); | |
1645 | } | |
1646 | ||
47360228 | 1647 | /* called in rcu_read_lock() section */ |
5969f71d | 1648 | static int __mkroute_input(struct sk_buff *skb, |
982721f3 | 1649 | const struct fib_result *res, |
5969f71d | 1650 | struct in_device *in_dev, |
c6cffba4 | 1651 | __be32 daddr, __be32 saddr, u32 tos) |
1da177e4 | 1652 | { |
2ffae99d | 1653 | struct fib_nh_exception *fnhe; |
1da177e4 LT |
1654 | struct rtable *rth; |
1655 | int err; | |
1656 | struct in_device *out_dev; | |
d2d68ba9 | 1657 | bool do_cache; |
fbdc0ad0 | 1658 | u32 itag = 0; |
1da177e4 LT |
1659 | |
1660 | /* get a working reference to the output device */ | |
47360228 | 1661 | out_dev = __in_dev_get_rcu(FIB_RES_DEV(*res)); |
51456b29 | 1662 | if (!out_dev) { |
e87cc472 | 1663 | net_crit_ratelimited("Bug in ip_route_input_slow(). Please report.\n"); |
1da177e4 LT |
1664 | return -EINVAL; |
1665 | } | |
1666 | ||
5c04c819 | 1667 | err = fib_validate_source(skb, saddr, daddr, tos, FIB_RES_OIF(*res), |
9e56e380 | 1668 | in_dev->dev, in_dev, &itag); |
1da177e4 | 1669 | if (err < 0) { |
e905a9ed | 1670 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
1da177e4 | 1671 | saddr); |
e905a9ed | 1672 | |
1da177e4 LT |
1673 | goto cleanup; |
1674 | } | |
1675 | ||
e81da0e1 JA |
1676 | do_cache = res->fi && !itag; |
1677 | if (out_dev == in_dev && err && IN_DEV_TX_REDIRECTS(out_dev) && | |
df4d9254 | 1678 | skb->protocol == htons(ETH_P_IP) && |
1da177e4 | 1679 | (IN_DEV_SHARED_MEDIA(out_dev) || |
df4d9254 HFS |
1680 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) |
1681 | IPCB(skb)->flags |= IPSKB_DOREDIRECT; | |
1da177e4 LT |
1682 | |
1683 | if (skb->protocol != htons(ETH_P_IP)) { | |
1684 | /* Not IP (i.e. ARP). Do not create route, if it is | |
1685 | * invalid for proxy arp. DNAT routes are always valid. | |
65324144 JDB |
1686 | * |
1687 | * Proxy arp feature have been extended to allow, ARP | |
1688 | * replies back to the same interface, to support | |
1689 | * Private VLAN switch technologies. See arp.c. | |
1da177e4 | 1690 | */ |
65324144 JDB |
1691 | if (out_dev == in_dev && |
1692 | IN_DEV_PROXY_ARP_PVLAN(in_dev) == 0) { | |
1da177e4 LT |
1693 | err = -EINVAL; |
1694 | goto cleanup; | |
1695 | } | |
1696 | } | |
1697 | ||
2ffae99d | 1698 | fnhe = find_exception(&FIB_RES_NH(*res), daddr); |
e81da0e1 | 1699 | if (do_cache) { |
deed49df | 1700 | if (fnhe) { |
2ffae99d | 1701 | rth = rcu_dereference(fnhe->fnhe_rth_input); |
deed49df XL |
1702 | if (rth && rth->dst.expires && |
1703 | time_after(jiffies, rth->dst.expires)) { | |
1704 | ip_del_fnhe(&FIB_RES_NH(*res), daddr); | |
1705 | fnhe = NULL; | |
1706 | } else { | |
1707 | goto rt_cache; | |
1708 | } | |
1709 | } | |
1710 | ||
1711 | rth = rcu_dereference(FIB_RES_NH(*res).nh_rth_input); | |
2ffae99d | 1712 | |
deed49df | 1713 | rt_cache: |
e81da0e1 JA |
1714 | if (rt_cache_valid(rth)) { |
1715 | skb_dst_set_noref(skb, &rth->dst); | |
1716 | goto out; | |
d2d68ba9 DM |
1717 | } |
1718 | } | |
f2bb4bed | 1719 | |
d08c4f35 | 1720 | rth = rt_dst_alloc(out_dev->dev, 0, res->type, |
5c1e6aa3 | 1721 | IN_DEV_CONF_GET(in_dev, NOPOLICY), |
d2d68ba9 | 1722 | IN_DEV_CONF_GET(out_dev, NOXFRM), do_cache); |
1da177e4 LT |
1723 | if (!rth) { |
1724 | err = -ENOBUFS; | |
1725 | goto cleanup; | |
1726 | } | |
1727 | ||
9917e1e8 | 1728 | rth->rt_is_input = 1; |
a6254864 | 1729 | RT_CACHE_STAT_INC(in_slow_tot); |
1da177e4 | 1730 | |
d8d1f30b | 1731 | rth->dst.input = ip_forward; |
1da177e4 | 1732 | |
a4c2fd7f WW |
1733 | rt_set_nexthop(rth, daddr, res, fnhe, res->fi, res->type, itag, |
1734 | do_cache); | |
9942895b | 1735 | lwtunnel_set_redirect(&rth->dst); |
c6cffba4 | 1736 | skb_dst_set(skb, &rth->dst); |
d2d68ba9 | 1737 | out: |
1da177e4 LT |
1738 | err = 0; |
1739 | cleanup: | |
1da177e4 | 1740 | return err; |
e905a9ed | 1741 | } |
1da177e4 | 1742 | |
79a13159 | 1743 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
79a13159 | 1744 | /* To make ICMP packets follow the right flow, the multipath hash is |
bf4e0a3d | 1745 | * calculated from the inner IP addresses. |
79a13159 | 1746 | */ |
bf4e0a3d NA |
1747 | static void ip_multipath_l3_keys(const struct sk_buff *skb, |
1748 | struct flow_keys *hash_keys) | |
79a13159 PN |
1749 | { |
1750 | const struct iphdr *outer_iph = ip_hdr(skb); | |
bf4e0a3d | 1751 | const struct iphdr *inner_iph; |
79a13159 PN |
1752 | const struct icmphdr *icmph; |
1753 | struct iphdr _inner_iph; | |
bf4e0a3d NA |
1754 | struct icmphdr _icmph; |
1755 | ||
1756 | hash_keys->addrs.v4addrs.src = outer_iph->saddr; | |
1757 | hash_keys->addrs.v4addrs.dst = outer_iph->daddr; | |
1758 | if (likely(outer_iph->protocol != IPPROTO_ICMP)) | |
1759 | return; | |
79a13159 PN |
1760 | |
1761 | if (unlikely((outer_iph->frag_off & htons(IP_OFFSET)) != 0)) | |
bf4e0a3d | 1762 | return; |
79a13159 PN |
1763 | |
1764 | icmph = skb_header_pointer(skb, outer_iph->ihl * 4, sizeof(_icmph), | |
1765 | &_icmph); | |
1766 | if (!icmph) | |
bf4e0a3d | 1767 | return; |
79a13159 PN |
1768 | |
1769 | if (icmph->type != ICMP_DEST_UNREACH && | |
1770 | icmph->type != ICMP_REDIRECT && | |
1771 | icmph->type != ICMP_TIME_EXCEEDED && | |
bf4e0a3d NA |
1772 | icmph->type != ICMP_PARAMETERPROB) |
1773 | return; | |
79a13159 PN |
1774 | |
1775 | inner_iph = skb_header_pointer(skb, | |
1776 | outer_iph->ihl * 4 + sizeof(_icmph), | |
1777 | sizeof(_inner_iph), &_inner_iph); | |
1778 | if (!inner_iph) | |
bf4e0a3d NA |
1779 | return; |
1780 | hash_keys->addrs.v4addrs.src = inner_iph->saddr; | |
1781 | hash_keys->addrs.v4addrs.dst = inner_iph->daddr; | |
1782 | } | |
79a13159 | 1783 | |
bf4e0a3d NA |
1784 | /* if skb is set it will be used and fl4 can be NULL */ |
1785 | int fib_multipath_hash(const struct fib_info *fi, const struct flowi4 *fl4, | |
1786 | const struct sk_buff *skb) | |
1787 | { | |
1788 | struct net *net = fi->fib_net; | |
1789 | struct flow_keys hash_keys; | |
1790 | u32 mhash; | |
79a13159 | 1791 | |
bf4e0a3d NA |
1792 | switch (net->ipv4.sysctl_fib_multipath_hash_policy) { |
1793 | case 0: | |
1794 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
1795 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
1796 | if (skb) { | |
1797 | ip_multipath_l3_keys(skb, &hash_keys); | |
1798 | } else { | |
1799 | hash_keys.addrs.v4addrs.src = fl4->saddr; | |
1800 | hash_keys.addrs.v4addrs.dst = fl4->daddr; | |
1801 | } | |
1802 | break; | |
1803 | case 1: | |
1804 | /* skb is currently provided only when forwarding */ | |
1805 | if (skb) { | |
1806 | unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; | |
1807 | struct flow_keys keys; | |
1808 | ||
1809 | /* short-circuit if we already have L4 hash present */ | |
1810 | if (skb->l4_hash) | |
1811 | return skb_get_hash_raw(skb) >> 1; | |
1812 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
1813 | skb_flow_dissect_flow_keys(skb, &keys, flag); | |
1fe4b118 DA |
1814 | |
1815 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
bf4e0a3d NA |
1816 | hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src; |
1817 | hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst; | |
1818 | hash_keys.ports.src = keys.ports.src; | |
1819 | hash_keys.ports.dst = keys.ports.dst; | |
1820 | hash_keys.basic.ip_proto = keys.basic.ip_proto; | |
1821 | } else { | |
1822 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
1823 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
1824 | hash_keys.addrs.v4addrs.src = fl4->saddr; | |
1825 | hash_keys.addrs.v4addrs.dst = fl4->daddr; | |
1826 | hash_keys.ports.src = fl4->fl4_sport; | |
1827 | hash_keys.ports.dst = fl4->fl4_dport; | |
1828 | hash_keys.basic.ip_proto = fl4->flowi4_proto; | |
1829 | } | |
1830 | break; | |
1831 | } | |
1832 | mhash = flow_hash_from_keys(&hash_keys); | |
79a13159 | 1833 | |
bf4e0a3d NA |
1834 | return mhash >> 1; |
1835 | } | |
79a13159 PN |
1836 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ |
1837 | ||
5969f71d SH |
1838 | static int ip_mkroute_input(struct sk_buff *skb, |
1839 | struct fib_result *res, | |
5969f71d SH |
1840 | struct in_device *in_dev, |
1841 | __be32 daddr, __be32 saddr, u32 tos) | |
1da177e4 | 1842 | { |
1da177e4 | 1843 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
0e884c78 | 1844 | if (res->fi && res->fi->fib_nhs > 1) { |
bf4e0a3d | 1845 | int h = fib_multipath_hash(res->fi, NULL, skb); |
0e884c78 | 1846 | |
0e884c78 PN |
1847 | fib_select_multipath(res, h); |
1848 | } | |
1da177e4 LT |
1849 | #endif |
1850 | ||
1851 | /* create a routing cache entry */ | |
c6cffba4 | 1852 | return __mkroute_input(skb, res, in_dev, daddr, saddr, tos); |
1da177e4 LT |
1853 | } |
1854 | ||
1da177e4 LT |
1855 | /* |
1856 | * NOTE. We drop all the packets that has local source | |
1857 | * addresses, because every properly looped back packet | |
1858 | * must have correct destination already attached by output routine. | |
1859 | * | |
1860 | * Such approach solves two big problems: | |
1861 | * 1. Not simplex devices are handled properly. | |
1862 | * 2. IP spoofing attempts are filtered with 100% of guarantee. | |
ebc0ffae | 1863 | * called with rcu_read_lock() |
1da177e4 LT |
1864 | */ |
1865 | ||
9e12bb22 | 1866 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
5510cdf7 DA |
1867 | u8 tos, struct net_device *dev, |
1868 | struct fib_result *res) | |
1da177e4 | 1869 | { |
96d36220 | 1870 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
1b7179d3 | 1871 | struct ip_tunnel_info *tun_info; |
68a5e3dd | 1872 | struct flowi4 fl4; |
95c96174 | 1873 | unsigned int flags = 0; |
1da177e4 | 1874 | u32 itag = 0; |
95c96174 | 1875 | struct rtable *rth; |
1da177e4 | 1876 | int err = -EINVAL; |
5e73ea1a | 1877 | struct net *net = dev_net(dev); |
d2d68ba9 | 1878 | bool do_cache; |
1da177e4 LT |
1879 | |
1880 | /* IP on this device is disabled. */ | |
1881 | ||
1882 | if (!in_dev) | |
1883 | goto out; | |
1884 | ||
1885 | /* Check for the most weird martians, which can be not detected | |
1886 | by fib_lookup. | |
1887 | */ | |
1888 | ||
61adedf3 | 1889 | tun_info = skb_tunnel_info(skb); |
46fa062a | 1890 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
1b7179d3 TG |
1891 | fl4.flowi4_tun_key.tun_id = tun_info->key.tun_id; |
1892 | else | |
1893 | fl4.flowi4_tun_key.tun_id = 0; | |
f38a9eb1 TG |
1894 | skb_dst_drop(skb); |
1895 | ||
d0daebc3 | 1896 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) |
1da177e4 LT |
1897 | goto martian_source; |
1898 | ||
5510cdf7 DA |
1899 | res->fi = NULL; |
1900 | res->table = NULL; | |
27a954bd | 1901 | if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0)) |
1da177e4 LT |
1902 | goto brd_input; |
1903 | ||
1904 | /* Accept zero addresses only to limited broadcast; | |
1905 | * I even do not know to fix it or not. Waiting for complains :-) | |
1906 | */ | |
f97c1e0c | 1907 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
1908 | goto martian_source; |
1909 | ||
d0daebc3 | 1910 | if (ipv4_is_zeronet(daddr)) |
1da177e4 LT |
1911 | goto martian_destination; |
1912 | ||
9eb43e76 ED |
1913 | /* Following code try to avoid calling IN_DEV_NET_ROUTE_LOCALNET(), |
1914 | * and call it once if daddr or/and saddr are loopback addresses | |
1915 | */ | |
1916 | if (ipv4_is_loopback(daddr)) { | |
1917 | if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) | |
d0daebc3 | 1918 | goto martian_destination; |
9eb43e76 ED |
1919 | } else if (ipv4_is_loopback(saddr)) { |
1920 | if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) | |
d0daebc3 TG |
1921 | goto martian_source; |
1922 | } | |
1923 | ||
1da177e4 LT |
1924 | /* |
1925 | * Now we are ready to route packet. | |
1926 | */ | |
68a5e3dd | 1927 | fl4.flowi4_oif = 0; |
e0d56fdd | 1928 | fl4.flowi4_iif = dev->ifindex; |
68a5e3dd DM |
1929 | fl4.flowi4_mark = skb->mark; |
1930 | fl4.flowi4_tos = tos; | |
1931 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
b84f7878 | 1932 | fl4.flowi4_flags = 0; |
68a5e3dd DM |
1933 | fl4.daddr = daddr; |
1934 | fl4.saddr = saddr; | |
8bcfd092 | 1935 | fl4.flowi4_uid = sock_net_uid(net, NULL); |
5510cdf7 | 1936 | err = fib_lookup(net, &fl4, res, 0); |
cd0f0b95 DJ |
1937 | if (err != 0) { |
1938 | if (!IN_DEV_FORWARD(in_dev)) | |
1939 | err = -EHOSTUNREACH; | |
1da177e4 | 1940 | goto no_route; |
cd0f0b95 | 1941 | } |
1da177e4 | 1942 | |
5510cdf7 | 1943 | if (res->type == RTN_BROADCAST) |
1da177e4 LT |
1944 | goto brd_input; |
1945 | ||
5510cdf7 | 1946 | if (res->type == RTN_LOCAL) { |
5c04c819 | 1947 | err = fib_validate_source(skb, saddr, daddr, tos, |
0d5edc68 | 1948 | 0, dev, in_dev, &itag); |
b5f7e755 | 1949 | if (err < 0) |
0d753960 | 1950 | goto martian_source; |
1da177e4 LT |
1951 | goto local_input; |
1952 | } | |
1953 | ||
cd0f0b95 DJ |
1954 | if (!IN_DEV_FORWARD(in_dev)) { |
1955 | err = -EHOSTUNREACH; | |
251da413 | 1956 | goto no_route; |
cd0f0b95 | 1957 | } |
5510cdf7 | 1958 | if (res->type != RTN_UNICAST) |
1da177e4 LT |
1959 | goto martian_destination; |
1960 | ||
5510cdf7 | 1961 | err = ip_mkroute_input(skb, res, in_dev, daddr, saddr, tos); |
1da177e4 LT |
1962 | out: return err; |
1963 | ||
1964 | brd_input: | |
1965 | if (skb->protocol != htons(ETH_P_IP)) | |
1966 | goto e_inval; | |
1967 | ||
41347dcd | 1968 | if (!ipv4_is_zeronet(saddr)) { |
9e56e380 DM |
1969 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
1970 | in_dev, &itag); | |
1da177e4 | 1971 | if (err < 0) |
0d753960 | 1972 | goto martian_source; |
1da177e4 LT |
1973 | } |
1974 | flags |= RTCF_BROADCAST; | |
5510cdf7 | 1975 | res->type = RTN_BROADCAST; |
1da177e4 LT |
1976 | RT_CACHE_STAT_INC(in_brd); |
1977 | ||
1978 | local_input: | |
d2d68ba9 | 1979 | do_cache = false; |
5510cdf7 | 1980 | if (res->fi) { |
fe3edf45 | 1981 | if (!itag) { |
5510cdf7 | 1982 | rth = rcu_dereference(FIB_RES_NH(*res).nh_rth_input); |
d2d68ba9 | 1983 | if (rt_cache_valid(rth)) { |
c6cffba4 DM |
1984 | skb_dst_set_noref(skb, &rth->dst); |
1985 | err = 0; | |
1986 | goto out; | |
d2d68ba9 DM |
1987 | } |
1988 | do_cache = true; | |
1989 | } | |
1990 | } | |
1991 | ||
f5a0aab8 | 1992 | rth = rt_dst_alloc(l3mdev_master_dev_rcu(dev) ? : net->loopback_dev, |
5510cdf7 | 1993 | flags | RTCF_LOCAL, res->type, |
d2d68ba9 | 1994 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false, do_cache); |
1da177e4 LT |
1995 | if (!rth) |
1996 | goto e_nobufs; | |
1997 | ||
d8d1f30b | 1998 | rth->dst.output= ip_rt_bug; |
cf911662 DM |
1999 | #ifdef CONFIG_IP_ROUTE_CLASSID |
2000 | rth->dst.tclassid = itag; | |
2001 | #endif | |
9917e1e8 | 2002 | rth->rt_is_input = 1; |
571e7226 | 2003 | |
a6254864 | 2004 | RT_CACHE_STAT_INC(in_slow_tot); |
5510cdf7 | 2005 | if (res->type == RTN_UNREACHABLE) { |
d8d1f30b CG |
2006 | rth->dst.input= ip_error; |
2007 | rth->dst.error= -err; | |
1da177e4 LT |
2008 | rth->rt_flags &= ~RTCF_LOCAL; |
2009 | } | |
efd85700 | 2010 | |
dcdfdf56 | 2011 | if (do_cache) { |
5510cdf7 | 2012 | struct fib_nh *nh = &FIB_RES_NH(*res); |
efd85700 TG |
2013 | |
2014 | rth->dst.lwtstate = lwtstate_get(nh->nh_lwtstate); | |
2015 | if (lwtunnel_input_redirect(rth->dst.lwtstate)) { | |
2016 | WARN_ON(rth->dst.input == lwtunnel_input); | |
2017 | rth->dst.lwtstate->orig_input = rth->dst.input; | |
2018 | rth->dst.input = lwtunnel_input; | |
2019 | } | |
2020 | ||
a4c2fd7f | 2021 | if (unlikely(!rt_cache_route(nh, rth))) |
dcdfdf56 | 2022 | rt_add_uncached_list(rth); |
dcdfdf56 | 2023 | } |
89aef892 | 2024 | skb_dst_set(skb, &rth->dst); |
b23dd4fe | 2025 | err = 0; |
ebc0ffae | 2026 | goto out; |
1da177e4 LT |
2027 | |
2028 | no_route: | |
2029 | RT_CACHE_STAT_INC(in_no_route); | |
5510cdf7 DA |
2030 | res->type = RTN_UNREACHABLE; |
2031 | res->fi = NULL; | |
2032 | res->table = NULL; | |
1da177e4 LT |
2033 | goto local_input; |
2034 | ||
2035 | /* | |
2036 | * Do not cache martian addresses: they should be logged (RFC1812) | |
2037 | */ | |
2038 | martian_destination: | |
2039 | RT_CACHE_STAT_INC(in_martian_dst); | |
2040 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
e87cc472 JP |
2041 | if (IN_DEV_LOG_MARTIANS(in_dev)) |
2042 | net_warn_ratelimited("martian destination %pI4 from %pI4, dev %s\n", | |
2043 | &daddr, &saddr, dev->name); | |
1da177e4 | 2044 | #endif |
2c2910a4 | 2045 | |
1da177e4 LT |
2046 | e_inval: |
2047 | err = -EINVAL; | |
ebc0ffae | 2048 | goto out; |
1da177e4 LT |
2049 | |
2050 | e_nobufs: | |
2051 | err = -ENOBUFS; | |
ebc0ffae | 2052 | goto out; |
1da177e4 LT |
2053 | |
2054 | martian_source: | |
2055 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); | |
ebc0ffae | 2056 | goto out; |
1da177e4 LT |
2057 | } |
2058 | ||
c6cffba4 DM |
2059 | int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
2060 | u8 tos, struct net_device *dev) | |
1da177e4 | 2061 | { |
5510cdf7 DA |
2062 | struct fib_result res; |
2063 | int err; | |
1da177e4 | 2064 | |
6e28099d | 2065 | tos &= IPTOS_RT_MASK; |
96d36220 | 2066 | rcu_read_lock(); |
5510cdf7 DA |
2067 | err = ip_route_input_rcu(skb, daddr, saddr, tos, dev, &res); |
2068 | rcu_read_unlock(); | |
96d36220 | 2069 | |
5510cdf7 DA |
2070 | return err; |
2071 | } | |
2072 | EXPORT_SYMBOL(ip_route_input_noref); | |
2073 | ||
2074 | /* called with rcu_read_lock held */ | |
2075 | int ip_route_input_rcu(struct sk_buff *skb, __be32 daddr, __be32 saddr, | |
2076 | u8 tos, struct net_device *dev, struct fib_result *res) | |
2077 | { | |
1da177e4 LT |
2078 | /* Multicast recognition logic is moved from route cache to here. |
2079 | The problem was that too many Ethernet cards have broken/missing | |
2080 | hardware multicast filters :-( As result the host on multicasting | |
2081 | network acquires a lot of useless route cache entries, sort of | |
2082 | SDR messages from all the world. Now we try to get rid of them. | |
2083 | Really, provided software IP multicast filter is organized | |
2084 | reasonably (at least, hashed), it does not result in a slowdown | |
2085 | comparing with route cache reject entries. | |
2086 | Note, that multicast routers are not affected, because | |
2087 | route cache entry is created eventually. | |
2088 | */ | |
f97c1e0c | 2089 | if (ipv4_is_multicast(daddr)) { |
96d36220 | 2090 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
e58e4159 | 2091 | int our = 0; |
5510cdf7 | 2092 | int err = -EINVAL; |
1da177e4 | 2093 | |
e58e4159 DA |
2094 | if (in_dev) |
2095 | our = ip_check_mc_rcu(in_dev, daddr, saddr, | |
2096 | ip_hdr(skb)->protocol); | |
2097 | ||
2098 | /* check l3 master if no match yet */ | |
2099 | if ((!in_dev || !our) && netif_is_l3_slave(dev)) { | |
2100 | struct in_device *l3_in_dev; | |
2101 | ||
2102 | l3_in_dev = __in_dev_get_rcu(skb->dev); | |
2103 | if (l3_in_dev) | |
2104 | our = ip_check_mc_rcu(l3_in_dev, daddr, saddr, | |
2105 | ip_hdr(skb)->protocol); | |
2106 | } | |
2107 | ||
e58e4159 | 2108 | if (our |
1da177e4 | 2109 | #ifdef CONFIG_IP_MROUTE |
e58e4159 DA |
2110 | || |
2111 | (!ipv4_is_local_multicast(daddr) && | |
2112 | IN_DEV_MFORWARD(in_dev)) | |
1da177e4 | 2113 | #endif |
e58e4159 | 2114 | ) { |
5510cdf7 | 2115 | err = ip_route_input_mc(skb, daddr, saddr, |
e58e4159 | 2116 | tos, dev, our); |
1da177e4 | 2117 | } |
5510cdf7 | 2118 | return err; |
1da177e4 | 2119 | } |
5510cdf7 DA |
2120 | |
2121 | return ip_route_input_slow(skb, daddr, saddr, tos, dev, res); | |
1da177e4 LT |
2122 | } |
2123 | ||
ebc0ffae | 2124 | /* called with rcu_read_lock() */ |
982721f3 | 2125 | static struct rtable *__mkroute_output(const struct fib_result *res, |
1a00fee4 | 2126 | const struct flowi4 *fl4, int orig_oif, |
f61759e6 | 2127 | struct net_device *dev_out, |
5ada5527 | 2128 | unsigned int flags) |
1da177e4 | 2129 | { |
982721f3 | 2130 | struct fib_info *fi = res->fi; |
f2bb4bed | 2131 | struct fib_nh_exception *fnhe; |
5ada5527 | 2132 | struct in_device *in_dev; |
982721f3 | 2133 | u16 type = res->type; |
5ada5527 | 2134 | struct rtable *rth; |
c92b9655 | 2135 | bool do_cache; |
1da177e4 | 2136 | |
d0daebc3 TG |
2137 | in_dev = __in_dev_get_rcu(dev_out); |
2138 | if (!in_dev) | |
5ada5527 | 2139 | return ERR_PTR(-EINVAL); |
1da177e4 | 2140 | |
d0daebc3 | 2141 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) |
5f02ce24 DA |
2142 | if (ipv4_is_loopback(fl4->saddr) && |
2143 | !(dev_out->flags & IFF_LOOPBACK) && | |
2144 | !netif_is_l3_master(dev_out)) | |
d0daebc3 TG |
2145 | return ERR_PTR(-EINVAL); |
2146 | ||
68a5e3dd | 2147 | if (ipv4_is_lbcast(fl4->daddr)) |
982721f3 | 2148 | type = RTN_BROADCAST; |
68a5e3dd | 2149 | else if (ipv4_is_multicast(fl4->daddr)) |
982721f3 | 2150 | type = RTN_MULTICAST; |
68a5e3dd | 2151 | else if (ipv4_is_zeronet(fl4->daddr)) |
5ada5527 | 2152 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
2153 | |
2154 | if (dev_out->flags & IFF_LOOPBACK) | |
2155 | flags |= RTCF_LOCAL; | |
2156 | ||
63617421 | 2157 | do_cache = true; |
982721f3 | 2158 | if (type == RTN_BROADCAST) { |
1da177e4 | 2159 | flags |= RTCF_BROADCAST | RTCF_LOCAL; |
982721f3 DM |
2160 | fi = NULL; |
2161 | } else if (type == RTN_MULTICAST) { | |
dd28d1a0 | 2162 | flags |= RTCF_MULTICAST | RTCF_LOCAL; |
813b3b5d DM |
2163 | if (!ip_check_mc_rcu(in_dev, fl4->daddr, fl4->saddr, |
2164 | fl4->flowi4_proto)) | |
1da177e4 | 2165 | flags &= ~RTCF_LOCAL; |
63617421 JA |
2166 | else |
2167 | do_cache = false; | |
1da177e4 | 2168 | /* If multicast route do not exist use |
dd28d1a0 ED |
2169 | * default one, but do not gateway in this case. |
2170 | * Yes, it is hack. | |
1da177e4 | 2171 | */ |
982721f3 DM |
2172 | if (fi && res->prefixlen < 4) |
2173 | fi = NULL; | |
d6d5e999 CF |
2174 | } else if ((type == RTN_LOCAL) && (orig_oif != 0) && |
2175 | (orig_oif != dev_out->ifindex)) { | |
2176 | /* For local routes that require a particular output interface | |
2177 | * we do not want to cache the result. Caching the result | |
2178 | * causes incorrect behaviour when there are multiple source | |
2179 | * addresses on the interface, the end result being that if the | |
2180 | * intended recipient is waiting on that interface for the | |
2181 | * packet he won't receive it because it will be delivered on | |
2182 | * the loopback interface and the IP_PKTINFO ipi_ifindex will | |
2183 | * be set to the loopback interface as well. | |
2184 | */ | |
2185 | fi = NULL; | |
1da177e4 LT |
2186 | } |
2187 | ||
f2bb4bed | 2188 | fnhe = NULL; |
63617421 JA |
2189 | do_cache &= fi != NULL; |
2190 | if (do_cache) { | |
c5038a83 | 2191 | struct rtable __rcu **prth; |
c92b9655 | 2192 | struct fib_nh *nh = &FIB_RES_NH(*res); |
d26b3a7c | 2193 | |
c92b9655 | 2194 | fnhe = find_exception(nh, fl4->daddr); |
deed49df | 2195 | if (fnhe) { |
2ffae99d | 2196 | prth = &fnhe->fnhe_rth_output; |
deed49df XL |
2197 | rth = rcu_dereference(*prth); |
2198 | if (rth && rth->dst.expires && | |
2199 | time_after(jiffies, rth->dst.expires)) { | |
2200 | ip_del_fnhe(nh, fl4->daddr); | |
2201 | fnhe = NULL; | |
2202 | } else { | |
2203 | goto rt_cache; | |
c92b9655 | 2204 | } |
c92b9655 | 2205 | } |
deed49df XL |
2206 | |
2207 | if (unlikely(fl4->flowi4_flags & | |
2208 | FLOWI_FLAG_KNOWN_NH && | |
2209 | !(nh->nh_gw && | |
2210 | nh->nh_scope == RT_SCOPE_LINK))) { | |
2211 | do_cache = false; | |
2212 | goto add; | |
2213 | } | |
2214 | prth = raw_cpu_ptr(nh->nh_pcpu_rth_output); | |
c5038a83 | 2215 | rth = rcu_dereference(*prth); |
deed49df XL |
2216 | |
2217 | rt_cache: | |
9df16efa | 2218 | if (rt_cache_valid(rth) && dst_hold_safe(&rth->dst)) |
c5038a83 | 2219 | return rth; |
f2bb4bed | 2220 | } |
c92b9655 JA |
2221 | |
2222 | add: | |
d08c4f35 | 2223 | rth = rt_dst_alloc(dev_out, flags, type, |
5c1e6aa3 | 2224 | IN_DEV_CONF_GET(in_dev, NOPOLICY), |
f2bb4bed | 2225 | IN_DEV_CONF_GET(in_dev, NOXFRM), |
c92b9655 | 2226 | do_cache); |
8391d07b | 2227 | if (!rth) |
5ada5527 | 2228 | return ERR_PTR(-ENOBUFS); |
8391d07b | 2229 | |
9438c871 | 2230 | rth->rt_iif = orig_oif; |
b7503e0c | 2231 | |
1da177e4 LT |
2232 | RT_CACHE_STAT_INC(out_slow_tot); |
2233 | ||
1da177e4 | 2234 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { |
e905a9ed | 2235 | if (flags & RTCF_LOCAL && |
1da177e4 | 2236 | !(dev_out->flags & IFF_LOOPBACK)) { |
d8d1f30b | 2237 | rth->dst.output = ip_mc_output; |
1da177e4 LT |
2238 | RT_CACHE_STAT_INC(out_slow_mc); |
2239 | } | |
2240 | #ifdef CONFIG_IP_MROUTE | |
982721f3 | 2241 | if (type == RTN_MULTICAST) { |
1da177e4 | 2242 | if (IN_DEV_MFORWARD(in_dev) && |
813b3b5d | 2243 | !ipv4_is_local_multicast(fl4->daddr)) { |
d8d1f30b CG |
2244 | rth->dst.input = ip_mr_input; |
2245 | rth->dst.output = ip_mc_output; | |
1da177e4 LT |
2246 | } |
2247 | } | |
2248 | #endif | |
2249 | } | |
2250 | ||
a4c2fd7f | 2251 | rt_set_nexthop(rth, fl4->daddr, res, fnhe, fi, type, 0, do_cache); |
9942895b | 2252 | lwtunnel_set_redirect(&rth->dst); |
1da177e4 | 2253 | |
5ada5527 | 2254 | return rth; |
1da177e4 LT |
2255 | } |
2256 | ||
1da177e4 LT |
2257 | /* |
2258 | * Major route resolver routine. | |
2259 | */ | |
2260 | ||
3abd1ade DA |
2261 | struct rtable *ip_route_output_key_hash(struct net *net, struct flowi4 *fl4, |
2262 | const struct sk_buff *skb) | |
1da177e4 | 2263 | { |
f61759e6 | 2264 | __u8 tos = RT_FL_TOS(fl4); |
813b3b5d | 2265 | struct fib_result res; |
5ada5527 | 2266 | struct rtable *rth; |
1da177e4 | 2267 | |
85b91b03 | 2268 | res.tclassid = 0; |
1da177e4 | 2269 | res.fi = NULL; |
8b96d22d | 2270 | res.table = NULL; |
1da177e4 | 2271 | |
1fb9489b | 2272 | fl4->flowi4_iif = LOOPBACK_IFINDEX; |
813b3b5d DM |
2273 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; |
2274 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
2275 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
44713b67 | 2276 | |
010c2708 | 2277 | rcu_read_lock(); |
3abd1ade DA |
2278 | rth = ip_route_output_key_hash_rcu(net, fl4, &res, skb); |
2279 | rcu_read_unlock(); | |
2280 | ||
2281 | return rth; | |
2282 | } | |
2283 | EXPORT_SYMBOL_GPL(ip_route_output_key_hash); | |
2284 | ||
2285 | struct rtable *ip_route_output_key_hash_rcu(struct net *net, struct flowi4 *fl4, | |
2286 | struct fib_result *res, | |
2287 | const struct sk_buff *skb) | |
2288 | { | |
2289 | struct net_device *dev_out = NULL; | |
2290 | int orig_oif = fl4->flowi4_oif; | |
2291 | unsigned int flags = 0; | |
2292 | struct rtable *rth; | |
2293 | int err = -ENETUNREACH; | |
2294 | ||
813b3b5d | 2295 | if (fl4->saddr) { |
b23dd4fe | 2296 | rth = ERR_PTR(-EINVAL); |
813b3b5d DM |
2297 | if (ipv4_is_multicast(fl4->saddr) || |
2298 | ipv4_is_lbcast(fl4->saddr) || | |
2299 | ipv4_is_zeronet(fl4->saddr)) | |
1da177e4 LT |
2300 | goto out; |
2301 | ||
1da177e4 LT |
2302 | /* I removed check for oif == dev_out->oif here. |
2303 | It was wrong for two reasons: | |
1ab35276 DL |
2304 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
2305 | is assigned to multiple interfaces. | |
1da177e4 LT |
2306 | 2. Moreover, we are allowed to send packets with saddr |
2307 | of another iface. --ANK | |
2308 | */ | |
2309 | ||
813b3b5d DM |
2310 | if (fl4->flowi4_oif == 0 && |
2311 | (ipv4_is_multicast(fl4->daddr) || | |
2312 | ipv4_is_lbcast(fl4->daddr))) { | |
a210d01a | 2313 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 2314 | dev_out = __ip_dev_find(net, fl4->saddr, false); |
51456b29 | 2315 | if (!dev_out) |
a210d01a JA |
2316 | goto out; |
2317 | ||
1da177e4 LT |
2318 | /* Special hack: user can direct multicasts |
2319 | and limited broadcast via necessary interface | |
2320 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. | |
2321 | This hack is not just for fun, it allows | |
2322 | vic,vat and friends to work. | |
2323 | They bind socket to loopback, set ttl to zero | |
2324 | and expect that it will work. | |
2325 | From the viewpoint of routing cache they are broken, | |
2326 | because we are not allowed to build multicast path | |
2327 | with loopback source addr (look, routing cache | |
2328 | cannot know, that ttl is zero, so that packet | |
2329 | will not leave this host and route is valid). | |
2330 | Luckily, this hack is good workaround. | |
2331 | */ | |
2332 | ||
813b3b5d | 2333 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2334 | goto make_route; |
2335 | } | |
a210d01a | 2336 | |
813b3b5d | 2337 | if (!(fl4->flowi4_flags & FLOWI_FLAG_ANYSRC)) { |
a210d01a | 2338 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 2339 | if (!__ip_dev_find(net, fl4->saddr, false)) |
a210d01a | 2340 | goto out; |
a210d01a | 2341 | } |
1da177e4 LT |
2342 | } |
2343 | ||
2344 | ||
813b3b5d DM |
2345 | if (fl4->flowi4_oif) { |
2346 | dev_out = dev_get_by_index_rcu(net, fl4->flowi4_oif); | |
b23dd4fe | 2347 | rth = ERR_PTR(-ENODEV); |
51456b29 | 2348 | if (!dev_out) |
1da177e4 | 2349 | goto out; |
e5ed6399 HX |
2350 | |
2351 | /* RACE: Check return value of inet_select_addr instead. */ | |
fc75fc83 | 2352 | if (!(dev_out->flags & IFF_UP) || !__in_dev_get_rcu(dev_out)) { |
b23dd4fe | 2353 | rth = ERR_PTR(-ENETUNREACH); |
fc75fc83 ED |
2354 | goto out; |
2355 | } | |
813b3b5d | 2356 | if (ipv4_is_local_multicast(fl4->daddr) || |
6a211654 AL |
2357 | ipv4_is_lbcast(fl4->daddr) || |
2358 | fl4->flowi4_proto == IPPROTO_IGMP) { | |
813b3b5d DM |
2359 | if (!fl4->saddr) |
2360 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2361 | RT_SCOPE_LINK); | |
1da177e4 LT |
2362 | goto make_route; |
2363 | } | |
0a7e2260 | 2364 | if (!fl4->saddr) { |
813b3b5d DM |
2365 | if (ipv4_is_multicast(fl4->daddr)) |
2366 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2367 | fl4->flowi4_scope); | |
2368 | else if (!fl4->daddr) | |
2369 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2370 | RT_SCOPE_HOST); | |
1da177e4 LT |
2371 | } |
2372 | } | |
2373 | ||
813b3b5d DM |
2374 | if (!fl4->daddr) { |
2375 | fl4->daddr = fl4->saddr; | |
2376 | if (!fl4->daddr) | |
2377 | fl4->daddr = fl4->saddr = htonl(INADDR_LOOPBACK); | |
b40afd0e | 2378 | dev_out = net->loopback_dev; |
1fb9489b | 2379 | fl4->flowi4_oif = LOOPBACK_IFINDEX; |
3abd1ade | 2380 | res->type = RTN_LOCAL; |
1da177e4 LT |
2381 | flags |= RTCF_LOCAL; |
2382 | goto make_route; | |
2383 | } | |
2384 | ||
3abd1ade | 2385 | err = fib_lookup(net, fl4, res, 0); |
0315e382 | 2386 | if (err) { |
3abd1ade DA |
2387 | res->fi = NULL; |
2388 | res->table = NULL; | |
6104e112 | 2389 | if (fl4->flowi4_oif && |
e58e4159 DA |
2390 | (ipv4_is_multicast(fl4->daddr) || |
2391 | !netif_index_is_l3_master(net, fl4->flowi4_oif))) { | |
1da177e4 LT |
2392 | /* Apparently, routing tables are wrong. Assume, |
2393 | that the destination is on link. | |
2394 | ||
2395 | WHY? DW. | |
2396 | Because we are allowed to send to iface | |
2397 | even if it has NO routes and NO assigned | |
2398 | addresses. When oif is specified, routing | |
2399 | tables are looked up with only one purpose: | |
2400 | to catch if destination is gatewayed, rather than | |
2401 | direct. Moreover, if MSG_DONTROUTE is set, | |
2402 | we send packet, ignoring both routing tables | |
2403 | and ifaddr state. --ANK | |
2404 | ||
2405 | ||
2406 | We could make it even if oif is unknown, | |
2407 | likely IPv6, but we do not. | |
2408 | */ | |
2409 | ||
813b3b5d DM |
2410 | if (fl4->saddr == 0) |
2411 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2412 | RT_SCOPE_LINK); | |
3abd1ade | 2413 | res->type = RTN_UNICAST; |
1da177e4 LT |
2414 | goto make_route; |
2415 | } | |
0315e382 | 2416 | rth = ERR_PTR(err); |
1da177e4 LT |
2417 | goto out; |
2418 | } | |
1da177e4 | 2419 | |
3abd1ade | 2420 | if (res->type == RTN_LOCAL) { |
813b3b5d | 2421 | if (!fl4->saddr) { |
3abd1ade DA |
2422 | if (res->fi->fib_prefsrc) |
2423 | fl4->saddr = res->fi->fib_prefsrc; | |
9fc3bbb4 | 2424 | else |
813b3b5d | 2425 | fl4->saddr = fl4->daddr; |
9fc3bbb4 | 2426 | } |
5f02ce24 DA |
2427 | |
2428 | /* L3 master device is the loopback for that domain */ | |
3abd1ade | 2429 | dev_out = l3mdev_master_dev_rcu(FIB_RES_DEV(*res)) ? : |
b7c8487c | 2430 | net->loopback_dev; |
839da4d9 DA |
2431 | |
2432 | /* make sure orig_oif points to fib result device even | |
2433 | * though packet rx/tx happens over loopback or l3mdev | |
2434 | */ | |
2435 | orig_oif = FIB_RES_OIF(*res); | |
2436 | ||
813b3b5d | 2437 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2438 | flags |= RTCF_LOCAL; |
2439 | goto make_route; | |
2440 | } | |
2441 | ||
3abd1ade | 2442 | fib_select_path(net, res, fl4, skb); |
1da177e4 | 2443 | |
3abd1ade | 2444 | dev_out = FIB_RES_DEV(*res); |
813b3b5d | 2445 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2446 | |
2447 | ||
2448 | make_route: | |
3abd1ade | 2449 | rth = __mkroute_output(res, fl4, orig_oif, dev_out, flags); |
1da177e4 | 2450 | |
010c2708 | 2451 | out: |
b23dd4fe | 2452 | return rth; |
1da177e4 | 2453 | } |
d8c97a94 | 2454 | |
ae2688d5 JW |
2455 | static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 cookie) |
2456 | { | |
2457 | return NULL; | |
2458 | } | |
2459 | ||
ebb762f2 | 2460 | static unsigned int ipv4_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 2461 | { |
618f9bc7 SK |
2462 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
2463 | ||
2464 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
2465 | } |
2466 | ||
6700c270 DM |
2467 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
2468 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
2469 | { |
2470 | } | |
2471 | ||
6700c270 DM |
2472 | static void ipv4_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
2473 | struct sk_buff *skb) | |
b587ee3b DM |
2474 | { |
2475 | } | |
2476 | ||
0972ddb2 HB |
2477 | static u32 *ipv4_rt_blackhole_cow_metrics(struct dst_entry *dst, |
2478 | unsigned long old) | |
2479 | { | |
2480 | return NULL; | |
2481 | } | |
2482 | ||
14e50e57 DM |
2483 | static struct dst_ops ipv4_dst_blackhole_ops = { |
2484 | .family = AF_INET, | |
ae2688d5 | 2485 | .check = ipv4_blackhole_dst_check, |
ebb762f2 | 2486 | .mtu = ipv4_blackhole_mtu, |
214f45c9 | 2487 | .default_advmss = ipv4_default_advmss, |
14e50e57 | 2488 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, |
b587ee3b | 2489 | .redirect = ipv4_rt_blackhole_redirect, |
0972ddb2 | 2490 | .cow_metrics = ipv4_rt_blackhole_cow_metrics, |
d3aaeb38 | 2491 | .neigh_lookup = ipv4_neigh_lookup, |
14e50e57 DM |
2492 | }; |
2493 | ||
2774c131 | 2494 | struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 2495 | { |
2774c131 | 2496 | struct rtable *ort = (struct rtable *) dst_orig; |
f5b0a874 | 2497 | struct rtable *rt; |
14e50e57 | 2498 | |
6c0e7284 | 2499 | rt = dst_alloc(&ipv4_dst_blackhole_ops, NULL, 1, DST_OBSOLETE_DEAD, 0); |
14e50e57 | 2500 | if (rt) { |
d8d1f30b | 2501 | struct dst_entry *new = &rt->dst; |
14e50e57 | 2502 | |
14e50e57 | 2503 | new->__use = 1; |
352e512c | 2504 | new->input = dst_discard; |
ede2059d | 2505 | new->output = dst_discard_out; |
14e50e57 | 2506 | |
1dbe3252 | 2507 | new->dev = net->loopback_dev; |
14e50e57 DM |
2508 | if (new->dev) |
2509 | dev_hold(new->dev); | |
2510 | ||
9917e1e8 | 2511 | rt->rt_is_input = ort->rt_is_input; |
5e2b61f7 | 2512 | rt->rt_iif = ort->rt_iif; |
5943634f | 2513 | rt->rt_pmtu = ort->rt_pmtu; |
14e50e57 | 2514 | |
ca4c3fc2 | 2515 | rt->rt_genid = rt_genid_ipv4(net); |
14e50e57 DM |
2516 | rt->rt_flags = ort->rt_flags; |
2517 | rt->rt_type = ort->rt_type; | |
14e50e57 | 2518 | rt->rt_gateway = ort->rt_gateway; |
155e8336 | 2519 | rt->rt_uses_gateway = ort->rt_uses_gateway; |
14e50e57 | 2520 | |
caacf05e | 2521 | INIT_LIST_HEAD(&rt->rt_uncached); |
14e50e57 DM |
2522 | } |
2523 | ||
2774c131 DM |
2524 | dst_release(dst_orig); |
2525 | ||
2526 | return rt ? &rt->dst : ERR_PTR(-ENOMEM); | |
14e50e57 DM |
2527 | } |
2528 | ||
9d6ec938 | 2529 | struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4, |
6f9c9615 | 2530 | const struct sock *sk) |
1da177e4 | 2531 | { |
9d6ec938 | 2532 | struct rtable *rt = __ip_route_output_key(net, flp4); |
1da177e4 | 2533 | |
b23dd4fe DM |
2534 | if (IS_ERR(rt)) |
2535 | return rt; | |
1da177e4 | 2536 | |
56157872 | 2537 | if (flp4->flowi4_proto) |
f92ee619 SK |
2538 | rt = (struct rtable *)xfrm_lookup_route(net, &rt->dst, |
2539 | flowi4_to_flowi(flp4), | |
2540 | sk, 0); | |
1da177e4 | 2541 | |
b23dd4fe | 2542 | return rt; |
1da177e4 | 2543 | } |
d8c97a94 ACM |
2544 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
2545 | ||
3765d35e | 2546 | /* called with rcu_read_lock held */ |
c36ba660 | 2547 | static int rt_fill_info(struct net *net, __be32 dst, __be32 src, u32 table_id, |
15e47304 | 2548 | struct flowi4 *fl4, struct sk_buff *skb, u32 portid, |
ba52d61e | 2549 | u32 seq) |
1da177e4 | 2550 | { |
ba52d61e | 2551 | struct rtable *rt = skb_rtable(skb); |
1da177e4 | 2552 | struct rtmsg *r; |
be403ea1 | 2553 | struct nlmsghdr *nlh; |
2bc8ca40 | 2554 | unsigned long expires = 0; |
f185071d | 2555 | u32 error; |
521f5490 | 2556 | u32 metrics[RTAX_MAX]; |
be403ea1 | 2557 | |
d3166e0c | 2558 | nlh = nlmsg_put(skb, portid, seq, RTM_NEWROUTE, sizeof(*r), 0); |
51456b29 | 2559 | if (!nlh) |
26932566 | 2560 | return -EMSGSIZE; |
be403ea1 TG |
2561 | |
2562 | r = nlmsg_data(nlh); | |
1da177e4 LT |
2563 | r->rtm_family = AF_INET; |
2564 | r->rtm_dst_len = 32; | |
2565 | r->rtm_src_len = 0; | |
d6c0a4f6 | 2566 | r->rtm_tos = fl4->flowi4_tos; |
8a430ed5 | 2567 | r->rtm_table = table_id < 256 ? table_id : RT_TABLE_COMPAT; |
c36ba660 | 2568 | if (nla_put_u32(skb, RTA_TABLE, table_id)) |
f3756b79 | 2569 | goto nla_put_failure; |
1da177e4 LT |
2570 | r->rtm_type = rt->rt_type; |
2571 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2572 | r->rtm_protocol = RTPROT_UNSPEC; | |
2573 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
2574 | if (rt->rt_flags & RTCF_NOTIFY) | |
2575 | r->rtm_flags |= RTM_F_NOTIFY; | |
df4d9254 HFS |
2576 | if (IPCB(skb)->flags & IPSKB_DOREDIRECT) |
2577 | r->rtm_flags |= RTCF_DOREDIRECT; | |
be403ea1 | 2578 | |
930345ea | 2579 | if (nla_put_in_addr(skb, RTA_DST, dst)) |
f3756b79 | 2580 | goto nla_put_failure; |
1a00fee4 | 2581 | if (src) { |
1da177e4 | 2582 | r->rtm_src_len = 32; |
930345ea | 2583 | if (nla_put_in_addr(skb, RTA_SRC, src)) |
f3756b79 | 2584 | goto nla_put_failure; |
1da177e4 | 2585 | } |
f3756b79 DM |
2586 | if (rt->dst.dev && |
2587 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2588 | goto nla_put_failure; | |
c7066f70 | 2589 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
2590 | if (rt->dst.tclassid && |
2591 | nla_put_u32(skb, RTA_FLOW, rt->dst.tclassid)) | |
2592 | goto nla_put_failure; | |
1da177e4 | 2593 | #endif |
41347dcd | 2594 | if (!rt_is_input_route(rt) && |
d6c0a4f6 | 2595 | fl4->saddr != src) { |
930345ea | 2596 | if (nla_put_in_addr(skb, RTA_PREFSRC, fl4->saddr)) |
f3756b79 DM |
2597 | goto nla_put_failure; |
2598 | } | |
155e8336 | 2599 | if (rt->rt_uses_gateway && |
930345ea | 2600 | nla_put_in_addr(skb, RTA_GATEWAY, rt->rt_gateway)) |
f3756b79 | 2601 | goto nla_put_failure; |
be403ea1 | 2602 | |
ee9a8f7a SK |
2603 | expires = rt->dst.expires; |
2604 | if (expires) { | |
2605 | unsigned long now = jiffies; | |
2606 | ||
2607 | if (time_before(now, expires)) | |
2608 | expires -= now; | |
2609 | else | |
2610 | expires = 0; | |
2611 | } | |
2612 | ||
521f5490 | 2613 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
ee9a8f7a | 2614 | if (rt->rt_pmtu && expires) |
521f5490 JA |
2615 | metrics[RTAX_MTU - 1] = rt->rt_pmtu; |
2616 | if (rtnetlink_put_metrics(skb, metrics) < 0) | |
be403ea1 TG |
2617 | goto nla_put_failure; |
2618 | ||
b4869889 | 2619 | if (fl4->flowi4_mark && |
68aaed54 | 2620 | nla_put_u32(skb, RTA_MARK, fl4->flowi4_mark)) |
f3756b79 | 2621 | goto nla_put_failure; |
963bfeee | 2622 | |
622ec2c9 LC |
2623 | if (!uid_eq(fl4->flowi4_uid, INVALID_UID) && |
2624 | nla_put_u32(skb, RTA_UID, | |
2625 | from_kuid_munged(current_user_ns(), fl4->flowi4_uid))) | |
2626 | goto nla_put_failure; | |
2627 | ||
d8d1f30b | 2628 | error = rt->dst.error; |
be403ea1 | 2629 | |
c7537967 | 2630 | if (rt_is_input_route(rt)) { |
8caaf7b6 ND |
2631 | #ifdef CONFIG_IP_MROUTE |
2632 | if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) && | |
2633 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)) { | |
2634 | int err = ipmr_get_route(net, skb, | |
2635 | fl4->saddr, fl4->daddr, | |
9f09eaea | 2636 | r, portid); |
2cf75070 | 2637 | |
8caaf7b6 | 2638 | if (err <= 0) { |
0c8d803f DA |
2639 | if (err == 0) |
2640 | return 0; | |
2641 | goto nla_put_failure; | |
8caaf7b6 ND |
2642 | } |
2643 | } else | |
2644 | #endif | |
91146153 | 2645 | if (nla_put_u32(skb, RTA_IIF, skb->dev->ifindex)) |
8caaf7b6 | 2646 | goto nla_put_failure; |
1da177e4 LT |
2647 | } |
2648 | ||
f185071d | 2649 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, error) < 0) |
e3703b3d | 2650 | goto nla_put_failure; |
be403ea1 | 2651 | |
053c095a JB |
2652 | nlmsg_end(skb, nlh); |
2653 | return 0; | |
1da177e4 | 2654 | |
be403ea1 | 2655 | nla_put_failure: |
26932566 PM |
2656 | nlmsg_cancel(skb, nlh); |
2657 | return -EMSGSIZE; | |
1da177e4 LT |
2658 | } |
2659 | ||
c21ef3e3 DA |
2660 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
2661 | struct netlink_ext_ack *extack) | |
1da177e4 | 2662 | { |
3b1e0a65 | 2663 | struct net *net = sock_net(in_skb->sk); |
d889ce3b TG |
2664 | struct rtmsg *rtm; |
2665 | struct nlattr *tb[RTA_MAX+1]; | |
3765d35e | 2666 | struct fib_result res = {}; |
1da177e4 | 2667 | struct rtable *rt = NULL; |
d6c0a4f6 | 2668 | struct flowi4 fl4; |
9e12bb22 AV |
2669 | __be32 dst = 0; |
2670 | __be32 src = 0; | |
2671 | u32 iif; | |
d889ce3b | 2672 | int err; |
963bfeee | 2673 | int mark; |
1da177e4 | 2674 | struct sk_buff *skb; |
c36ba660 | 2675 | u32 table_id = RT_TABLE_MAIN; |
622ec2c9 | 2676 | kuid_t uid; |
1da177e4 | 2677 | |
fceb6435 | 2678 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy, |
c21ef3e3 | 2679 | extack); |
d889ce3b TG |
2680 | if (err < 0) |
2681 | goto errout; | |
2682 | ||
2683 | rtm = nlmsg_data(nlh); | |
2684 | ||
1da177e4 | 2685 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
51456b29 | 2686 | if (!skb) { |
d889ce3b TG |
2687 | err = -ENOBUFS; |
2688 | goto errout; | |
2689 | } | |
1da177e4 LT |
2690 | |
2691 | /* Reserve room for dummy headers, this skb can pass | |
2692 | through good chunk of routing engine. | |
2693 | */ | |
459a98ed | 2694 | skb_reset_mac_header(skb); |
c1d2bbe1 | 2695 | skb_reset_network_header(skb); |
d2c962b8 | 2696 | |
67b61f6c JB |
2697 | src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0; |
2698 | dst = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0; | |
d889ce3b | 2699 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
963bfeee | 2700 | mark = tb[RTA_MARK] ? nla_get_u32(tb[RTA_MARK]) : 0; |
622ec2c9 LC |
2701 | if (tb[RTA_UID]) |
2702 | uid = make_kuid(current_user_ns(), nla_get_u32(tb[RTA_UID])); | |
2703 | else | |
2704 | uid = (iif ? INVALID_UID : current_uid()); | |
1da177e4 | 2705 | |
bbadb9a2 FL |
2706 | /* Bugfix: need to give ip_route_input enough of an IP header to |
2707 | * not gag. | |
2708 | */ | |
2709 | ip_hdr(skb)->protocol = IPPROTO_UDP; | |
2710 | ip_hdr(skb)->saddr = src; | |
2711 | ip_hdr(skb)->daddr = dst; | |
2712 | ||
2713 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); | |
2714 | ||
d6c0a4f6 DM |
2715 | memset(&fl4, 0, sizeof(fl4)); |
2716 | fl4.daddr = dst; | |
2717 | fl4.saddr = src; | |
2718 | fl4.flowi4_tos = rtm->rtm_tos; | |
2719 | fl4.flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0; | |
2720 | fl4.flowi4_mark = mark; | |
622ec2c9 | 2721 | fl4.flowi4_uid = uid; |
d6c0a4f6 | 2722 | |
3765d35e DA |
2723 | rcu_read_lock(); |
2724 | ||
1da177e4 | 2725 | if (iif) { |
d889ce3b TG |
2726 | struct net_device *dev; |
2727 | ||
3765d35e | 2728 | dev = dev_get_by_index_rcu(net, iif); |
51456b29 | 2729 | if (!dev) { |
d889ce3b TG |
2730 | err = -ENODEV; |
2731 | goto errout_free; | |
2732 | } | |
2733 | ||
1da177e4 LT |
2734 | skb->protocol = htons(ETH_P_IP); |
2735 | skb->dev = dev; | |
963bfeee | 2736 | skb->mark = mark; |
3765d35e DA |
2737 | err = ip_route_input_rcu(skb, dst, src, rtm->rtm_tos, |
2738 | dev, &res); | |
d889ce3b | 2739 | |
511c3f92 | 2740 | rt = skb_rtable(skb); |
d8d1f30b CG |
2741 | if (err == 0 && rt->dst.error) |
2742 | err = -rt->dst.error; | |
1da177e4 | 2743 | } else { |
6503a304 | 2744 | fl4.flowi4_iif = LOOPBACK_IFINDEX; |
3765d35e | 2745 | rt = ip_route_output_key_hash_rcu(net, &fl4, &res, skb); |
b23dd4fe DM |
2746 | err = 0; |
2747 | if (IS_ERR(rt)) | |
2748 | err = PTR_ERR(rt); | |
2c87d63a FW |
2749 | else |
2750 | skb_dst_set(skb, &rt->dst); | |
1da177e4 | 2751 | } |
d889ce3b | 2752 | |
1da177e4 | 2753 | if (err) |
d889ce3b | 2754 | goto errout_free; |
1da177e4 | 2755 | |
1da177e4 LT |
2756 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
2757 | rt->rt_flags |= RTCF_NOTIFY; | |
2758 | ||
c36ba660 | 2759 | if (rtm->rtm_flags & RTM_F_LOOKUP_TABLE) |
68e813aa | 2760 | table_id = res.table ? res.table->tb_id : 0; |
c36ba660 | 2761 | |
bc3aae2b RP |
2762 | if (rtm->rtm_flags & RTM_F_FIB_MATCH) { |
2763 | if (!res.fi) { | |
2764 | err = fib_props[res.type].error; | |
2765 | if (!err) | |
2766 | err = -EHOSTUNREACH; | |
2767 | goto errout_free; | |
2768 | } | |
b6179813 RP |
2769 | err = fib_dump_info(skb, NETLINK_CB(in_skb).portid, |
2770 | nlh->nlmsg_seq, RTM_NEWROUTE, table_id, | |
2771 | rt->rt_type, res.prefix, res.prefixlen, | |
2772 | fl4.flowi4_tos, res.fi, 0); | |
bc3aae2b | 2773 | } else { |
b6179813 | 2774 | err = rt_fill_info(net, dst, src, table_id, &fl4, skb, |
ba52d61e | 2775 | NETLINK_CB(in_skb).portid, nlh->nlmsg_seq); |
bc3aae2b | 2776 | } |
7b46a644 | 2777 | if (err < 0) |
d889ce3b | 2778 | goto errout_free; |
1da177e4 | 2779 | |
3765d35e DA |
2780 | rcu_read_unlock(); |
2781 | ||
15e47304 | 2782 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
d889ce3b | 2783 | errout: |
2942e900 | 2784 | return err; |
1da177e4 | 2785 | |
d889ce3b | 2786 | errout_free: |
3765d35e | 2787 | rcu_read_unlock(); |
1da177e4 | 2788 | kfree_skb(skb); |
d889ce3b | 2789 | goto errout; |
1da177e4 LT |
2790 | } |
2791 | ||
1da177e4 LT |
2792 | void ip_rt_multicast_event(struct in_device *in_dev) |
2793 | { | |
4ccfe6d4 | 2794 | rt_cache_flush(dev_net(in_dev->dev)); |
1da177e4 LT |
2795 | } |
2796 | ||
2797 | #ifdef CONFIG_SYSCTL | |
082c7ca4 G |
2798 | static int ip_rt_gc_interval __read_mostly = 60 * HZ; |
2799 | static int ip_rt_gc_min_interval __read_mostly = HZ / 2; | |
2800 | static int ip_rt_gc_elasticity __read_mostly = 8; | |
2801 | ||
fe2c6338 | 2802 | static int ipv4_sysctl_rtcache_flush(struct ctl_table *__ctl, int write, |
8d65af78 | 2803 | void __user *buffer, |
1da177e4 LT |
2804 | size_t *lenp, loff_t *ppos) |
2805 | { | |
5aad1de5 TT |
2806 | struct net *net = (struct net *)__ctl->extra1; |
2807 | ||
1da177e4 | 2808 | if (write) { |
5aad1de5 TT |
2809 | rt_cache_flush(net); |
2810 | fnhe_genid_bump(net); | |
1da177e4 | 2811 | return 0; |
e905a9ed | 2812 | } |
1da177e4 LT |
2813 | |
2814 | return -EINVAL; | |
2815 | } | |
2816 | ||
fe2c6338 | 2817 | static struct ctl_table ipv4_route_table[] = { |
1da177e4 | 2818 | { |
1da177e4 LT |
2819 | .procname = "gc_thresh", |
2820 | .data = &ipv4_dst_ops.gc_thresh, | |
2821 | .maxlen = sizeof(int), | |
2822 | .mode = 0644, | |
6d9f239a | 2823 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2824 | }, |
2825 | { | |
1da177e4 LT |
2826 | .procname = "max_size", |
2827 | .data = &ip_rt_max_size, | |
2828 | .maxlen = sizeof(int), | |
2829 | .mode = 0644, | |
6d9f239a | 2830 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2831 | }, |
2832 | { | |
2833 | /* Deprecated. Use gc_min_interval_ms */ | |
e905a9ed | 2834 | |
1da177e4 LT |
2835 | .procname = "gc_min_interval", |
2836 | .data = &ip_rt_gc_min_interval, | |
2837 | .maxlen = sizeof(int), | |
2838 | .mode = 0644, | |
6d9f239a | 2839 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2840 | }, |
2841 | { | |
1da177e4 LT |
2842 | .procname = "gc_min_interval_ms", |
2843 | .data = &ip_rt_gc_min_interval, | |
2844 | .maxlen = sizeof(int), | |
2845 | .mode = 0644, | |
6d9f239a | 2846 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 LT |
2847 | }, |
2848 | { | |
1da177e4 LT |
2849 | .procname = "gc_timeout", |
2850 | .data = &ip_rt_gc_timeout, | |
2851 | .maxlen = sizeof(int), | |
2852 | .mode = 0644, | |
6d9f239a | 2853 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 | 2854 | }, |
9f28a2fc ED |
2855 | { |
2856 | .procname = "gc_interval", | |
2857 | .data = &ip_rt_gc_interval, | |
2858 | .maxlen = sizeof(int), | |
2859 | .mode = 0644, | |
2860 | .proc_handler = proc_dointvec_jiffies, | |
2861 | }, | |
1da177e4 | 2862 | { |
1da177e4 LT |
2863 | .procname = "redirect_load", |
2864 | .data = &ip_rt_redirect_load, | |
2865 | .maxlen = sizeof(int), | |
2866 | .mode = 0644, | |
6d9f239a | 2867 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2868 | }, |
2869 | { | |
1da177e4 LT |
2870 | .procname = "redirect_number", |
2871 | .data = &ip_rt_redirect_number, | |
2872 | .maxlen = sizeof(int), | |
2873 | .mode = 0644, | |
6d9f239a | 2874 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2875 | }, |
2876 | { | |
1da177e4 LT |
2877 | .procname = "redirect_silence", |
2878 | .data = &ip_rt_redirect_silence, | |
2879 | .maxlen = sizeof(int), | |
2880 | .mode = 0644, | |
6d9f239a | 2881 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2882 | }, |
2883 | { | |
1da177e4 LT |
2884 | .procname = "error_cost", |
2885 | .data = &ip_rt_error_cost, | |
2886 | .maxlen = sizeof(int), | |
2887 | .mode = 0644, | |
6d9f239a | 2888 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2889 | }, |
2890 | { | |
1da177e4 LT |
2891 | .procname = "error_burst", |
2892 | .data = &ip_rt_error_burst, | |
2893 | .maxlen = sizeof(int), | |
2894 | .mode = 0644, | |
6d9f239a | 2895 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2896 | }, |
2897 | { | |
1da177e4 LT |
2898 | .procname = "gc_elasticity", |
2899 | .data = &ip_rt_gc_elasticity, | |
2900 | .maxlen = sizeof(int), | |
2901 | .mode = 0644, | |
6d9f239a | 2902 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2903 | }, |
2904 | { | |
1da177e4 LT |
2905 | .procname = "mtu_expires", |
2906 | .data = &ip_rt_mtu_expires, | |
2907 | .maxlen = sizeof(int), | |
2908 | .mode = 0644, | |
6d9f239a | 2909 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2910 | }, |
2911 | { | |
1da177e4 LT |
2912 | .procname = "min_pmtu", |
2913 | .data = &ip_rt_min_pmtu, | |
2914 | .maxlen = sizeof(int), | |
2915 | .mode = 0644, | |
6d9f239a | 2916 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2917 | }, |
2918 | { | |
1da177e4 LT |
2919 | .procname = "min_adv_mss", |
2920 | .data = &ip_rt_min_advmss, | |
2921 | .maxlen = sizeof(int), | |
2922 | .mode = 0644, | |
6d9f239a | 2923 | .proc_handler = proc_dointvec, |
1da177e4 | 2924 | }, |
f8572d8f | 2925 | { } |
1da177e4 | 2926 | }; |
39a23e75 | 2927 | |
39a23e75 DL |
2928 | static struct ctl_table ipv4_route_flush_table[] = { |
2929 | { | |
39a23e75 DL |
2930 | .procname = "flush", |
2931 | .maxlen = sizeof(int), | |
2932 | .mode = 0200, | |
6d9f239a | 2933 | .proc_handler = ipv4_sysctl_rtcache_flush, |
39a23e75 | 2934 | }, |
f8572d8f | 2935 | { }, |
39a23e75 DL |
2936 | }; |
2937 | ||
2938 | static __net_init int sysctl_route_net_init(struct net *net) | |
2939 | { | |
2940 | struct ctl_table *tbl; | |
2941 | ||
2942 | tbl = ipv4_route_flush_table; | |
09ad9bc7 | 2943 | if (!net_eq(net, &init_net)) { |
39a23e75 | 2944 | tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL); |
51456b29 | 2945 | if (!tbl) |
39a23e75 | 2946 | goto err_dup; |
464dc801 EB |
2947 | |
2948 | /* Don't export sysctls to unprivileged users */ | |
2949 | if (net->user_ns != &init_user_ns) | |
2950 | tbl[0].procname = NULL; | |
39a23e75 DL |
2951 | } |
2952 | tbl[0].extra1 = net; | |
2953 | ||
ec8f23ce | 2954 | net->ipv4.route_hdr = register_net_sysctl(net, "net/ipv4/route", tbl); |
51456b29 | 2955 | if (!net->ipv4.route_hdr) |
39a23e75 DL |
2956 | goto err_reg; |
2957 | return 0; | |
2958 | ||
2959 | err_reg: | |
2960 | if (tbl != ipv4_route_flush_table) | |
2961 | kfree(tbl); | |
2962 | err_dup: | |
2963 | return -ENOMEM; | |
2964 | } | |
2965 | ||
2966 | static __net_exit void sysctl_route_net_exit(struct net *net) | |
2967 | { | |
2968 | struct ctl_table *tbl; | |
2969 | ||
2970 | tbl = net->ipv4.route_hdr->ctl_table_arg; | |
2971 | unregister_net_sysctl_table(net->ipv4.route_hdr); | |
2972 | BUG_ON(tbl == ipv4_route_flush_table); | |
2973 | kfree(tbl); | |
2974 | } | |
2975 | ||
2976 | static __net_initdata struct pernet_operations sysctl_route_ops = { | |
2977 | .init = sysctl_route_net_init, | |
2978 | .exit = sysctl_route_net_exit, | |
f84c6821 | 2979 | .async = true, |
39a23e75 | 2980 | }; |
1da177e4 LT |
2981 | #endif |
2982 | ||
3ee94372 | 2983 | static __net_init int rt_genid_init(struct net *net) |
9f5e97e5 | 2984 | { |
ca4c3fc2 | 2985 | atomic_set(&net->ipv4.rt_genid, 0); |
5aad1de5 | 2986 | atomic_set(&net->fnhe_genid, 0); |
7aed9f72 | 2987 | atomic_set(&net->ipv4.dev_addr_genid, get_random_int()); |
9f5e97e5 DL |
2988 | return 0; |
2989 | } | |
2990 | ||
3ee94372 NH |
2991 | static __net_initdata struct pernet_operations rt_genid_ops = { |
2992 | .init = rt_genid_init, | |
f84c6821 | 2993 | .async = true, |
9f5e97e5 DL |
2994 | }; |
2995 | ||
c3426b47 DM |
2996 | static int __net_init ipv4_inetpeer_init(struct net *net) |
2997 | { | |
2998 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
2999 | ||
3000 | if (!bp) | |
3001 | return -ENOMEM; | |
3002 | inet_peer_base_init(bp); | |
3003 | net->ipv4.peers = bp; | |
3004 | return 0; | |
3005 | } | |
3006 | ||
3007 | static void __net_exit ipv4_inetpeer_exit(struct net *net) | |
3008 | { | |
3009 | struct inet_peer_base *bp = net->ipv4.peers; | |
3010 | ||
3011 | net->ipv4.peers = NULL; | |
56a6b248 | 3012 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3013 | kfree(bp); |
3014 | } | |
3015 | ||
3016 | static __net_initdata struct pernet_operations ipv4_inetpeer_ops = { | |
3017 | .init = ipv4_inetpeer_init, | |
3018 | .exit = ipv4_inetpeer_exit, | |
f84c6821 | 3019 | .async = true, |
c3426b47 | 3020 | }; |
9f5e97e5 | 3021 | |
c7066f70 | 3022 | #ifdef CONFIG_IP_ROUTE_CLASSID |
7d720c3e | 3023 | struct ip_rt_acct __percpu *ip_rt_acct __read_mostly; |
c7066f70 | 3024 | #endif /* CONFIG_IP_ROUTE_CLASSID */ |
1da177e4 | 3025 | |
1da177e4 LT |
3026 | int __init ip_rt_init(void) |
3027 | { | |
5055c371 | 3028 | int cpu; |
1da177e4 | 3029 | |
73f156a6 ED |
3030 | ip_idents = kmalloc(IP_IDENTS_SZ * sizeof(*ip_idents), GFP_KERNEL); |
3031 | if (!ip_idents) | |
3032 | panic("IP: failed to allocate ip_idents\n"); | |
3033 | ||
3034 | prandom_bytes(ip_idents, IP_IDENTS_SZ * sizeof(*ip_idents)); | |
3035 | ||
355b590c ED |
3036 | ip_tstamps = kcalloc(IP_IDENTS_SZ, sizeof(*ip_tstamps), GFP_KERNEL); |
3037 | if (!ip_tstamps) | |
3038 | panic("IP: failed to allocate ip_tstamps\n"); | |
3039 | ||
5055c371 ED |
3040 | for_each_possible_cpu(cpu) { |
3041 | struct uncached_list *ul = &per_cpu(rt_uncached_list, cpu); | |
3042 | ||
3043 | INIT_LIST_HEAD(&ul->head); | |
3044 | spin_lock_init(&ul->lock); | |
3045 | } | |
c7066f70 | 3046 | #ifdef CONFIG_IP_ROUTE_CLASSID |
0dcec8c2 | 3047 | ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct), __alignof__(struct ip_rt_acct)); |
1da177e4 LT |
3048 | if (!ip_rt_acct) |
3049 | panic("IP: failed to allocate ip_rt_acct\n"); | |
1da177e4 LT |
3050 | #endif |
3051 | ||
e5d679f3 AD |
3052 | ipv4_dst_ops.kmem_cachep = |
3053 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, | |
20c2df83 | 3054 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 | 3055 | |
14e50e57 DM |
3056 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
3057 | ||
fc66f95c ED |
3058 | if (dst_entries_init(&ipv4_dst_ops) < 0) |
3059 | panic("IP: failed to allocate ipv4_dst_ops counter\n"); | |
3060 | ||
3061 | if (dst_entries_init(&ipv4_dst_blackhole_ops) < 0) | |
3062 | panic("IP: failed to allocate ipv4_dst_blackhole_ops counter\n"); | |
3063 | ||
89aef892 DM |
3064 | ipv4_dst_ops.gc_thresh = ~0; |
3065 | ip_rt_max_size = INT_MAX; | |
1da177e4 | 3066 | |
1da177e4 LT |
3067 | devinet_init(); |
3068 | ip_fib_init(); | |
3069 | ||
73b38711 | 3070 | if (ip_rt_proc_init()) |
058bd4d2 | 3071 | pr_err("Unable to create route proc files\n"); |
1da177e4 LT |
3072 | #ifdef CONFIG_XFRM |
3073 | xfrm_init(); | |
703fb94e | 3074 | xfrm4_init(); |
1da177e4 | 3075 | #endif |
394f51ab FW |
3076 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL, |
3077 | RTNL_FLAG_DOIT_UNLOCKED); | |
63f3444f | 3078 | |
39a23e75 DL |
3079 | #ifdef CONFIG_SYSCTL |
3080 | register_pernet_subsys(&sysctl_route_ops); | |
3081 | #endif | |
3ee94372 | 3082 | register_pernet_subsys(&rt_genid_ops); |
c3426b47 | 3083 | register_pernet_subsys(&ipv4_inetpeer_ops); |
1bcdca3f | 3084 | return 0; |
1da177e4 LT |
3085 | } |
3086 | ||
a1bc6eb4 | 3087 | #ifdef CONFIG_SYSCTL |
eeb61f71 AV |
3088 | /* |
3089 | * We really need to sanitize the damn ipv4 init order, then all | |
3090 | * this nonsense will go away. | |
3091 | */ | |
3092 | void __init ip_static_sysctl_init(void) | |
3093 | { | |
4e5ca785 | 3094 | register_net_sysctl(&init_net, "net/ipv4/route", ipv4_route_table); |
eeb61f71 | 3095 | } |
a1bc6eb4 | 3096 | #endif |