]>
Commit | Line | Data |
---|---|---|
2fff1175 AF |
1 | diff -Naur linux-3.10.30.org/drivers/net/imq.c linux-3.10.30/drivers/net/imq.c |
2 | --- linux-3.10.30.org/drivers/net/imq.c 1970-01-01 01:00:00.000000000 +0100 | |
3 | +++ linux-3.10.30/drivers/net/imq.c 2014-02-14 20:29:05.379402305 +0100 | |
4 | @@ -0,0 +1,1001 @@ | |
5 | +/* | |
6 | + * Pseudo-driver for the intermediate queue device. | |
7 | + * | |
8 | + * This program is free software; you can redistribute it and/or | |
9 | + * modify it under the terms of the GNU General Public License | |
10 | + * as published by the Free Software Foundation; either version | |
11 | + * 2 of the License, or (at your option) any later version. | |
12 | + * | |
13 | + * Authors: Patrick McHardy, <kaber@trash.net> | |
14 | + * | |
15 | + * The first version was written by Martin Devera, <devik@cdi.cz> | |
16 | + * | |
17 | + * Credits: Jan Rafaj <imq2t@cedric.vabo.cz> | |
18 | + * - Update patch to 2.4.21 | |
19 | + * Sebastian Strollo <sstrollo@nortelnetworks.com> | |
20 | + * - Fix "Dead-loop on netdevice imq"-issue | |
21 | + * Marcel Sebek <sebek64@post.cz> | |
22 | + * - Update to 2.6.2-rc1 | |
23 | + * | |
24 | + * After some time of inactivity there is a group taking care | |
25 | + * of IMQ again: http://www.linuximq.net | |
26 | + * | |
27 | + * | |
28 | + * 2004/06/30 - New version of IMQ patch to kernels <=2.6.7 | |
29 | + * including the following changes: | |
30 | + * | |
31 | + * - Correction of ipv6 support "+"s issue (Hasso Tepper) | |
32 | + * - Correction of imq_init_devs() issue that resulted in | |
33 | + * kernel OOPS unloading IMQ as module (Norbert Buchmuller) | |
34 | + * - Addition of functionality to choose number of IMQ devices | |
35 | + * during kernel config (Andre Correa) | |
36 | + * - Addition of functionality to choose how IMQ hooks on | |
37 | + * PRE and POSTROUTING (after or before NAT) (Andre Correa) | |
38 | + * - Cosmetic corrections (Norbert Buchmuller) (Andre Correa) | |
39 | + * | |
40 | + * | |
41 | + * 2005/12/16 - IMQ versions between 2.6.7 and 2.6.13 were | |
42 | + * released with almost no problems. 2.6.14-x was released | |
43 | + * with some important changes: nfcache was removed; After | |
44 | + * some weeks of trouble we figured out that some IMQ fields | |
45 | + * in skb were missing in skbuff.c - skb_clone and copy_skb_header. | |
46 | + * These functions are correctly patched by this new patch version. | |
47 | + * | |
48 | + * Thanks for all who helped to figure out all the problems with | |
49 | + * 2.6.14.x: Patrick McHardy, Rune Kock, VeNoMouS, Max CtRiX, | |
50 | + * Kevin Shanahan, Richard Lucassen, Valery Dachev (hopefully | |
51 | + * I didn't forget anybody). I apologize again for my lack of time. | |
52 | + * | |
53 | + * | |
54 | + * 2008/06/17 - 2.6.25 - Changed imq.c to use qdisc_run() instead | |
55 | + * of qdisc_restart() and moved qdisc_run() to tasklet to avoid | |
56 | + * recursive locking. New initialization routines to fix 'rmmod' not | |
57 | + * working anymore. Used code from ifb.c. (Jussi Kivilinna) | |
58 | + * | |
59 | + * 2008/08/06 - 2.6.26 - (JK) | |
60 | + * - Replaced tasklet with 'netif_schedule()'. | |
61 | + * - Cleaned up and added comments for imq_nf_queue(). | |
62 | + * | |
63 | + * 2009/04/12 | |
64 | + * - Add skb_save_cb/skb_restore_cb helper functions for backuping | |
65 | + * control buffer. This is needed because qdisc-layer on kernels | |
66 | + * 2.6.27 and newer overwrite control buffer. (Jussi Kivilinna) | |
67 | + * - Add better locking for IMQ device. Hopefully this will solve | |
68 | + * SMP issues. (Jussi Kivilinna) | |
69 | + * - Port to 2.6.27 | |
70 | + * - Port to 2.6.28 | |
71 | + * - Port to 2.6.29 + fix rmmod not working | |
72 | + * | |
73 | + * 2009/04/20 - (Jussi Kivilinna) | |
74 | + * - Use netdevice feature flags to avoid extra packet handling | |
75 | + * by core networking layer and possibly increase performance. | |
76 | + * | |
77 | + * 2009/09/26 - (Jussi Kivilinna) | |
78 | + * - Add imq_nf_reinject_lockless to fix deadlock with | |
79 | + * imq_nf_queue/imq_nf_reinject. | |
80 | + * | |
81 | + * 2009/12/08 - (Jussi Kivilinna) | |
82 | + * - Port to 2.6.32 | |
83 | + * - Add check for skb->nf_queue_entry==NULL in imq_dev_xmit() | |
84 | + * - Also add better error checking for skb->nf_queue_entry usage | |
85 | + * | |
86 | + * 2010/02/25 - (Jussi Kivilinna) | |
87 | + * - Port to 2.6.33 | |
88 | + * | |
89 | + * 2010/08/15 - (Jussi Kivilinna) | |
90 | + * - Port to 2.6.35 | |
91 | + * - Simplify hook registration by using nf_register_hooks. | |
92 | + * - nf_reinject doesn't need spinlock around it, therefore remove | |
93 | + * imq_nf_reinject function. Other nf_reinject users protect | |
94 | + * their own data with spinlock. With IMQ however all data is | |
95 | + * needed is stored per skbuff, so no locking is needed. | |
96 | + * - Changed IMQ to use 'separate' NF_IMQ_QUEUE instead of | |
97 | + * NF_QUEUE, this allows working coexistance of IMQ and other | |
98 | + * NF_QUEUE users. | |
99 | + * - Make IMQ multi-queue. Number of IMQ device queues can be | |
100 | + * increased with 'numqueues' module parameters. Default number | |
101 | + * of queues is 1, in other words by default IMQ works as | |
102 | + * single-queue device. Multi-queue selection is based on | |
103 | + * IFB multi-queue patch by Changli Gao <xiaosuo@gmail.com>. | |
104 | + * | |
105 | + * 2011/03/18 - (Jussi Kivilinna) | |
106 | + * - Port to 2.6.38 | |
107 | + * | |
108 | + * 2011/07/12 - (syoder89@gmail.com) | |
109 | + * - Crash fix that happens when the receiving interface has more | |
110 | + * than one queue (add missing skb_set_queue_mapping in | |
111 | + * imq_select_queue). | |
112 | + * | |
113 | + * 2011/07/26 - (Jussi Kivilinna) | |
114 | + * - Add queue mapping checks for packets exiting IMQ. | |
115 | + * - Port to 3.0 | |
116 | + * | |
117 | + * 2011/08/16 - (Jussi Kivilinna) | |
118 | + * - Clear IFF_TX_SKB_SHARING flag that was added for linux 3.0.2 | |
119 | + * | |
120 | + * 2011/11/03 - Germano Michel <germanomichel@gmail.com> | |
121 | + * - Fix IMQ for net namespaces | |
122 | + * | |
123 | + * 2011/11/04 - Jussi Kivilinna <jussi.kivilinna@mbnet.fi> | |
124 | + * - Port to 3.1 | |
125 | + * - Clean-up, move 'get imq device pointer by imqX name' to | |
126 | + * separate function from imq_nf_queue(). | |
127 | + * | |
128 | + * 2012/01/05 - Jussi Kivilinna <jussi.kivilinna@mbnet.fi> | |
129 | + * - Port to 3.2 | |
130 | + * | |
131 | + * 2012/03/19 - Jussi Kivilinna <jussi.kivilinna@mbnet.fi> | |
132 | + * - Port to 3.3 | |
133 | + * | |
134 | + * 2012/12/12 - Jussi Kivilinna <jussi.kivilinna@mbnet.fi> | |
135 | + * - Port to 3.7 | |
136 | + * - Fix checkpatch.pl warnings | |
137 | + * | |
138 | + * 2013/09/10 - Jussi Kivilinna <jussi.kivilinna@iki.fi> | |
139 | + * - Fixed GSO handling for 3.10, see imq_nf_queue() for comments. | |
140 | + * - Don't copy skb->cb_next when copying or cloning skbuffs. | |
141 | + * | |
142 | + * Also, many thanks to pablo Sebastian Greco for making the initial | |
143 | + * patch and to those who helped the testing. | |
144 | + * | |
145 | + * More info at: http://www.linuximq.net/ (Andre Correa) | |
146 | + */ | |
147 | + | |
148 | +#include <linux/module.h> | |
149 | +#include <linux/kernel.h> | |
150 | +#include <linux/moduleparam.h> | |
151 | +#include <linux/list.h> | |
152 | +#include <linux/skbuff.h> | |
153 | +#include <linux/netdevice.h> | |
154 | +#include <linux/etherdevice.h> | |
155 | +#include <linux/rtnetlink.h> | |
156 | +#include <linux/if_arp.h> | |
157 | +#include <linux/netfilter.h> | |
158 | +#include <linux/netfilter_ipv4.h> | |
159 | +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
160 | + #include <linux/netfilter_ipv6.h> | |
161 | +#endif | |
162 | +#include <linux/imq.h> | |
163 | +#include <net/pkt_sched.h> | |
164 | +#include <net/netfilter/nf_queue.h> | |
165 | +#include <net/sock.h> | |
166 | +#include <linux/ip.h> | |
167 | +#include <linux/ipv6.h> | |
168 | +#include <linux/if_vlan.h> | |
169 | +#include <linux/if_pppox.h> | |
170 | +#include <net/ip.h> | |
171 | +#include <net/ipv6.h> | |
172 | + | |
173 | +static int imq_nf_queue(struct nf_queue_entry *entry, unsigned queue_num); | |
174 | + | |
175 | +static nf_hookfn imq_nf_hook; | |
176 | + | |
177 | +static struct nf_hook_ops imq_ops[] = { | |
178 | + { | |
179 | + /* imq_ingress_ipv4 */ | |
180 | + .hook = imq_nf_hook, | |
181 | + .owner = THIS_MODULE, | |
182 | + .pf = PF_INET, | |
183 | + .hooknum = NF_INET_PRE_ROUTING, | |
184 | +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB) | |
185 | + .priority = NF_IP_PRI_MANGLE + 1, | |
186 | +#else | |
187 | + .priority = NF_IP_PRI_NAT_DST + 1, | |
188 | +#endif | |
189 | + }, | |
190 | + { | |
191 | + /* imq_egress_ipv4 */ | |
192 | + .hook = imq_nf_hook, | |
193 | + .owner = THIS_MODULE, | |
194 | + .pf = PF_INET, | |
195 | + .hooknum = NF_INET_POST_ROUTING, | |
196 | +#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA) | |
197 | + .priority = NF_IP_PRI_LAST, | |
198 | +#else | |
199 | + .priority = NF_IP_PRI_NAT_SRC - 1, | |
200 | +#endif | |
201 | + }, | |
202 | +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
203 | + { | |
204 | + /* imq_ingress_ipv6 */ | |
205 | + .hook = imq_nf_hook, | |
206 | + .owner = THIS_MODULE, | |
207 | + .pf = PF_INET6, | |
208 | + .hooknum = NF_INET_PRE_ROUTING, | |
209 | +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB) | |
210 | + .priority = NF_IP6_PRI_MANGLE + 1, | |
211 | +#else | |
212 | + .priority = NF_IP6_PRI_NAT_DST + 1, | |
213 | +#endif | |
214 | + }, | |
215 | + { | |
216 | + /* imq_egress_ipv6 */ | |
217 | + .hook = imq_nf_hook, | |
218 | + .owner = THIS_MODULE, | |
219 | + .pf = PF_INET6, | |
220 | + .hooknum = NF_INET_POST_ROUTING, | |
221 | +#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA) | |
222 | + .priority = NF_IP6_PRI_LAST, | |
223 | +#else | |
224 | + .priority = NF_IP6_PRI_NAT_SRC - 1, | |
225 | +#endif | |
226 | + }, | |
227 | +#endif | |
228 | +}; | |
229 | + | |
230 | +#if defined(CONFIG_IMQ_NUM_DEVS) | |
231 | +static int numdevs = CONFIG_IMQ_NUM_DEVS; | |
232 | +#else | |
233 | +static int numdevs = IMQ_MAX_DEVS; | |
234 | +#endif | |
235 | + | |
236 | +static struct net_device *imq_devs_cache[IMQ_MAX_DEVS]; | |
237 | + | |
238 | +#define IMQ_MAX_QUEUES 32 | |
239 | +static int numqueues = 1; | |
240 | +static u32 imq_hashrnd; | |
241 | + | |
242 | +static inline __be16 pppoe_proto(const struct sk_buff *skb) | |
243 | +{ | |
244 | + return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
245 | + sizeof(struct pppoe_hdr))); | |
246 | +} | |
247 | + | |
248 | +static u16 imq_hash(struct net_device *dev, struct sk_buff *skb) | |
249 | +{ | |
250 | + unsigned int pull_len; | |
251 | + u16 protocol = skb->protocol; | |
252 | + u32 addr1, addr2; | |
253 | + u32 hash, ihl = 0; | |
254 | + union { | |
255 | + u16 in16[2]; | |
256 | + u32 in32; | |
257 | + } ports; | |
258 | + u8 ip_proto; | |
259 | + | |
260 | + pull_len = 0; | |
261 | + | |
262 | +recheck: | |
263 | + switch (protocol) { | |
264 | + case htons(ETH_P_8021Q): { | |
265 | + if (unlikely(skb_pull(skb, VLAN_HLEN) == NULL)) | |
266 | + goto other; | |
267 | + | |
268 | + pull_len += VLAN_HLEN; | |
269 | + skb->network_header += VLAN_HLEN; | |
270 | + | |
271 | + protocol = vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
272 | + goto recheck; | |
273 | + } | |
274 | + | |
275 | + case htons(ETH_P_PPP_SES): { | |
276 | + if (unlikely(skb_pull(skb, PPPOE_SES_HLEN) == NULL)) | |
277 | + goto other; | |
278 | + | |
279 | + pull_len += PPPOE_SES_HLEN; | |
280 | + skb->network_header += PPPOE_SES_HLEN; | |
281 | + | |
282 | + protocol = pppoe_proto(skb); | |
283 | + goto recheck; | |
284 | + } | |
285 | + | |
286 | + case htons(ETH_P_IP): { | |
287 | + const struct iphdr *iph = ip_hdr(skb); | |
288 | + | |
289 | + if (unlikely(!pskb_may_pull(skb, sizeof(struct iphdr)))) | |
290 | + goto other; | |
291 | + | |
292 | + addr1 = iph->daddr; | |
293 | + addr2 = iph->saddr; | |
294 | + | |
295 | + ip_proto = !(ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) ? | |
296 | + iph->protocol : 0; | |
297 | + ihl = ip_hdrlen(skb); | |
298 | + | |
299 | + break; | |
300 | + } | |
301 | +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
302 | + case htons(ETH_P_IPV6): { | |
303 | + const struct ipv6hdr *iph = ipv6_hdr(skb); | |
304 | + __be16 fo = 0; | |
305 | + | |
306 | + if (unlikely(!pskb_may_pull(skb, sizeof(struct ipv6hdr)))) | |
307 | + goto other; | |
308 | + | |
309 | + addr1 = iph->daddr.s6_addr32[3]; | |
310 | + addr2 = iph->saddr.s6_addr32[3]; | |
311 | + ihl = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &ip_proto, | |
312 | + &fo); | |
313 | + if (unlikely(ihl < 0)) | |
314 | + goto other; | |
315 | + | |
316 | + break; | |
317 | + } | |
318 | +#endif | |
319 | + default: | |
320 | +other: | |
321 | + if (pull_len != 0) { | |
322 | + skb_push(skb, pull_len); | |
323 | + skb->network_header -= pull_len; | |
324 | + } | |
325 | + | |
326 | + return (u16)(ntohs(protocol) % dev->real_num_tx_queues); | |
327 | + } | |
328 | + | |
329 | + if (addr1 > addr2) | |
330 | + swap(addr1, addr2); | |
331 | + | |
332 | + switch (ip_proto) { | |
333 | + case IPPROTO_TCP: | |
334 | + case IPPROTO_UDP: | |
335 | + case IPPROTO_DCCP: | |
336 | + case IPPROTO_ESP: | |
337 | + case IPPROTO_AH: | |
338 | + case IPPROTO_SCTP: | |
339 | + case IPPROTO_UDPLITE: { | |
340 | + if (likely(skb_copy_bits(skb, ihl, &ports.in32, 4) >= 0)) { | |
341 | + if (ports.in16[0] > ports.in16[1]) | |
342 | + swap(ports.in16[0], ports.in16[1]); | |
343 | + break; | |
344 | + } | |
345 | + /* fall-through */ | |
346 | + } | |
347 | + default: | |
348 | + ports.in32 = 0; | |
349 | + break; | |
350 | + } | |
351 | + | |
352 | + if (pull_len != 0) { | |
353 | + skb_push(skb, pull_len); | |
354 | + skb->network_header -= pull_len; | |
355 | + } | |
356 | + | |
357 | + hash = jhash_3words(addr1, addr2, ports.in32, imq_hashrnd ^ ip_proto); | |
358 | + | |
359 | + return (u16)(((u64)hash * dev->real_num_tx_queues) >> 32); | |
360 | +} | |
361 | + | |
362 | +static inline bool sk_tx_queue_recorded(struct sock *sk) | |
363 | +{ | |
364 | + return (sk_tx_queue_get(sk) >= 0); | |
365 | +} | |
366 | + | |
367 | +static struct netdev_queue *imq_select_queue(struct net_device *dev, | |
368 | + struct sk_buff *skb) | |
369 | +{ | |
370 | + u16 queue_index = 0; | |
371 | + u32 hash; | |
372 | + | |
373 | + if (likely(dev->real_num_tx_queues == 1)) | |
374 | + goto out; | |
375 | + | |
376 | + /* IMQ can be receiving ingress or engress packets. */ | |
377 | + | |
378 | + /* Check first for if rx_queue is set */ | |
379 | + if (skb_rx_queue_recorded(skb)) { | |
380 | + queue_index = skb_get_rx_queue(skb); | |
381 | + goto out; | |
382 | + } | |
383 | + | |
384 | + /* Check if socket has tx_queue set */ | |
385 | + if (sk_tx_queue_recorded(skb->sk)) { | |
386 | + queue_index = sk_tx_queue_get(skb->sk); | |
387 | + goto out; | |
388 | + } | |
389 | + | |
390 | + /* Try use socket hash */ | |
391 | + if (skb->sk && skb->sk->sk_hash) { | |
392 | + hash = skb->sk->sk_hash; | |
393 | + queue_index = | |
394 | + (u16)(((u64)hash * dev->real_num_tx_queues) >> 32); | |
395 | + goto out; | |
396 | + } | |
397 | + | |
398 | + /* Generate hash from packet data */ | |
399 | + queue_index = imq_hash(dev, skb); | |
400 | + | |
401 | +out: | |
402 | + if (unlikely(queue_index >= dev->real_num_tx_queues)) | |
403 | + queue_index = (u16)((u32)queue_index % dev->real_num_tx_queues); | |
404 | + | |
405 | + skb_set_queue_mapping(skb, queue_index); | |
406 | + return netdev_get_tx_queue(dev, queue_index); | |
407 | +} | |
408 | + | |
409 | +static struct net_device_stats *imq_get_stats(struct net_device *dev) | |
410 | +{ | |
411 | + return &dev->stats; | |
412 | +} | |
413 | + | |
414 | +/* called for packets kfree'd in qdiscs at places other than enqueue */ | |
415 | +static void imq_skb_destructor(struct sk_buff *skb) | |
416 | +{ | |
417 | + struct nf_queue_entry *entry = skb->nf_queue_entry; | |
418 | + | |
419 | + skb->nf_queue_entry = NULL; | |
420 | + | |
421 | + if (entry) { | |
422 | + nf_queue_entry_release_refs(entry); | |
423 | + kfree(entry); | |
424 | + } | |
425 | + | |
426 | + skb_restore_cb(skb); /* kfree backup */ | |
427 | +} | |
428 | + | |
429 | +static void imq_done_check_queue_mapping(struct sk_buff *skb, | |
430 | + struct net_device *dev) | |
431 | +{ | |
432 | + unsigned int queue_index; | |
433 | + | |
434 | + /* Don't let queue_mapping be left too large after exiting IMQ */ | |
435 | + if (likely(skb->dev != dev && skb->dev != NULL)) { | |
436 | + queue_index = skb_get_queue_mapping(skb); | |
437 | + if (unlikely(queue_index >= skb->dev->real_num_tx_queues)) { | |
438 | + queue_index = (u16)((u32)queue_index % | |
439 | + skb->dev->real_num_tx_queues); | |
440 | + skb_set_queue_mapping(skb, queue_index); | |
441 | + } | |
442 | + } else { | |
443 | + /* skb->dev was IMQ device itself or NULL, be on safe side and | |
444 | + * just clear queue mapping. | |
445 | + */ | |
446 | + skb_set_queue_mapping(skb, 0); | |
447 | + } | |
448 | +} | |
449 | + | |
450 | +static netdev_tx_t imq_dev_xmit(struct sk_buff *skb, struct net_device *dev) | |
451 | +{ | |
452 | + struct nf_queue_entry *entry = skb->nf_queue_entry; | |
453 | + | |
454 | + skb->nf_queue_entry = NULL; | |
455 | + dev->trans_start = jiffies; | |
456 | + | |
457 | + dev->stats.tx_bytes += skb->len; | |
458 | + dev->stats.tx_packets++; | |
459 | + | |
460 | + if (unlikely(entry == NULL)) { | |
461 | + /* We don't know what is going on here.. packet is queued for | |
462 | + * imq device, but (probably) not by us. | |
463 | + * | |
464 | + * If this packet was not send here by imq_nf_queue(), then | |
465 | + * skb_save_cb() was not used and skb_free() should not show: | |
466 | + * WARNING: IMQ: kfree_skb: skb->cb_next:.. | |
467 | + * and/or | |
468 | + * WARNING: IMQ: kfree_skb: skb->nf_queue_entry... | |
469 | + * | |
470 | + * However if this message is shown, then IMQ is somehow broken | |
471 | + * and you should report this to linuximq.net. | |
472 | + */ | |
473 | + | |
474 | + /* imq_dev_xmit is black hole that eats all packets, report that | |
475 | + * we eat this packet happily and increase dropped counters. | |
476 | + */ | |
477 | + | |
478 | + dev->stats.tx_dropped++; | |
479 | + dev_kfree_skb(skb); | |
480 | + | |
481 | + return NETDEV_TX_OK; | |
482 | + } | |
483 | + | |
484 | + skb_restore_cb(skb); /* restore skb->cb */ | |
485 | + | |
486 | + skb->imq_flags = 0; | |
487 | + skb->destructor = NULL; | |
488 | + | |
489 | + imq_done_check_queue_mapping(skb, dev); | |
490 | + | |
491 | + nf_reinject(entry, NF_ACCEPT); | |
492 | + | |
493 | + return NETDEV_TX_OK; | |
494 | +} | |
495 | + | |
496 | +static struct net_device *get_imq_device_by_index(int index) | |
497 | +{ | |
498 | + struct net_device *dev = NULL; | |
499 | + struct net *net; | |
500 | + char buf[8]; | |
501 | + | |
502 | + /* get device by name and cache result */ | |
503 | + snprintf(buf, sizeof(buf), "imq%d", index); | |
504 | + | |
505 | + /* Search device from all namespaces. */ | |
506 | + for_each_net(net) { | |
507 | + dev = dev_get_by_name(net, buf); | |
508 | + if (dev) | |
509 | + break; | |
510 | + } | |
511 | + | |
512 | + if (WARN_ON_ONCE(dev == NULL)) { | |
513 | + /* IMQ device not found. Exotic config? */ | |
514 | + return ERR_PTR(-ENODEV); | |
515 | + } | |
516 | + | |
517 | + imq_devs_cache[index] = dev; | |
518 | + dev_put(dev); | |
519 | + | |
520 | + return dev; | |
521 | +} | |
522 | + | |
523 | +static struct nf_queue_entry *nf_queue_entry_dup(struct nf_queue_entry *e) | |
524 | +{ | |
525 | + struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); | |
526 | + if (entry) { | |
527 | + if (nf_queue_entry_get_refs(entry)) | |
528 | + return entry; | |
529 | + kfree(entry); | |
530 | + } | |
531 | + return NULL; | |
532 | +} | |
533 | + | |
534 | +#ifdef CONFIG_BRIDGE_NETFILTER | |
535 | +/* When called from bridge netfilter, skb->data must point to MAC header | |
536 | + * before calling skb_gso_segment(). Else, original MAC header is lost | |
537 | + * and segmented skbs will be sent to wrong destination. | |
538 | + */ | |
539 | +static void nf_bridge_adjust_skb_data(struct sk_buff *skb) | |
540 | +{ | |
541 | + if (skb->nf_bridge) | |
542 | + __skb_push(skb, skb->network_header - skb->mac_header); | |
543 | +} | |
544 | + | |
545 | +static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) | |
546 | +{ | |
547 | + if (skb->nf_bridge) | |
548 | + __skb_pull(skb, skb->network_header - skb->mac_header); | |
549 | +} | |
550 | +#else | |
551 | +#define nf_bridge_adjust_skb_data(s) do {} while (0) | |
552 | +#define nf_bridge_adjust_segmented_data(s) do {} while (0) | |
553 | +#endif | |
554 | + | |
555 | +static void free_entry(struct nf_queue_entry *entry) | |
556 | +{ | |
557 | + nf_queue_entry_release_refs(entry); | |
558 | + kfree(entry); | |
559 | +} | |
560 | + | |
561 | +static int __imq_nf_queue(struct nf_queue_entry *entry, struct net_device *dev); | |
562 | + | |
563 | +static int __imq_nf_queue_gso(struct nf_queue_entry *entry, | |
564 | + struct net_device *dev, struct sk_buff *skb) | |
565 | +{ | |
566 | + int ret = -ENOMEM; | |
567 | + struct nf_queue_entry *entry_seg; | |
568 | + | |
569 | + nf_bridge_adjust_segmented_data(skb); | |
570 | + | |
571 | + if (skb->next == NULL) { /* last packet, no need to copy entry */ | |
572 | + struct sk_buff *gso_skb = entry->skb; | |
573 | + entry->skb = skb; | |
574 | + ret = __imq_nf_queue(entry, dev); | |
575 | + if (ret) | |
576 | + entry->skb = gso_skb; | |
577 | + return ret; | |
578 | + } | |
579 | + | |
580 | + skb->next = NULL; | |
581 | + | |
582 | + entry_seg = nf_queue_entry_dup(entry); | |
583 | + if (entry_seg) { | |
584 | + entry_seg->skb = skb; | |
585 | + ret = __imq_nf_queue(entry_seg, dev); | |
586 | + if (ret) | |
587 | + free_entry(entry_seg); | |
588 | + } | |
589 | + return ret; | |
590 | +} | |
591 | + | |
592 | +static int imq_nf_queue(struct nf_queue_entry *entry, unsigned queue_num) | |
593 | +{ | |
594 | + struct sk_buff *skb, *segs; | |
595 | + struct net_device *dev; | |
596 | + unsigned int queued; | |
597 | + int index, retval, err; | |
598 | + | |
599 | + index = entry->skb->imq_flags & IMQ_F_IFMASK; | |
600 | + if (unlikely(index > numdevs - 1)) { | |
601 | + if (net_ratelimit()) | |
602 | + pr_warn("IMQ: invalid device specified, highest is %u\n", | |
603 | + numdevs - 1); | |
604 | + retval = -EINVAL; | |
605 | + goto out_no_dev; | |
606 | + } | |
607 | + | |
608 | + /* check for imq device by index from cache */ | |
609 | + dev = imq_devs_cache[index]; | |
610 | + if (unlikely(!dev)) { | |
611 | + dev = get_imq_device_by_index(index); | |
612 | + if (IS_ERR(dev)) { | |
613 | + retval = PTR_ERR(dev); | |
614 | + goto out_no_dev; | |
615 | + } | |
616 | + } | |
617 | + | |
618 | + if (unlikely(!(dev->flags & IFF_UP))) { | |
619 | + entry->skb->imq_flags = 0; | |
620 | + retval = -ECANCELED; | |
621 | + goto out_no_dev; | |
622 | + } | |
623 | + | |
624 | + if (!skb_is_gso(entry->skb)) | |
625 | + return __imq_nf_queue(entry, dev); | |
626 | + | |
627 | + /* Since 3.10.x, GSO handling moved here as result of upstream commit | |
628 | + * a5fedd43d5f6c94c71053a66e4c3d2e35f1731a2 (netfilter: move | |
629 | + * skb_gso_segment into nfnetlink_queue module). | |
630 | + * | |
631 | + * Following code replicates the gso handling from | |
632 | + * 'net/netfilter/nfnetlink_queue_core.c':nfqnl_enqueue_packet(). | |
633 | + */ | |
634 | + | |
635 | + skb = entry->skb; | |
636 | + | |
637 | + switch (entry->pf) { | |
638 | + case NFPROTO_IPV4: | |
639 | + skb->protocol = htons(ETH_P_IP); | |
640 | + break; | |
641 | + case NFPROTO_IPV6: | |
642 | + skb->protocol = htons(ETH_P_IPV6); | |
643 | + break; | |
644 | + } | |
645 | + | |
646 | + nf_bridge_adjust_skb_data(skb); | |
647 | + segs = skb_gso_segment(skb, 0); | |
648 | + /* Does not use PTR_ERR to limit the number of error codes that can be | |
649 | + * returned by nf_queue. For instance, callers rely on -ECANCELED to | |
650 | + * mean 'ignore this hook'. | |
651 | + */ | |
652 | + err = -ENOBUFS; | |
653 | + if (IS_ERR(segs)) | |
654 | + goto out_err; | |
655 | + queued = 0; | |
656 | + err = 0; | |
657 | + do { | |
658 | + struct sk_buff *nskb = segs->next; | |
659 | + if (nskb && nskb->next) | |
660 | + nskb->cb_next = NULL; | |
661 | + if (err == 0) | |
662 | + err = __imq_nf_queue_gso(entry, dev, segs); | |
663 | + if (err == 0) | |
664 | + queued++; | |
665 | + else | |
666 | + kfree_skb(segs); | |
667 | + segs = nskb; | |
668 | + } while (segs); | |
669 | + | |
670 | + if (queued) { | |
671 | + if (err) /* some segments are already queued */ | |
672 | + free_entry(entry); | |
673 | + kfree_skb(skb); | |
674 | + return 0; | |
675 | + } | |
676 | + | |
677 | +out_err: | |
678 | + nf_bridge_adjust_segmented_data(skb); | |
679 | + retval = err; | |
680 | +out_no_dev: | |
681 | + return retval; | |
682 | +} | |
683 | + | |
684 | +static int __imq_nf_queue(struct nf_queue_entry *entry, struct net_device *dev) | |
685 | +{ | |
686 | + struct sk_buff *skb_orig, *skb, *skb_shared; | |
687 | + struct Qdisc *q; | |
688 | + struct netdev_queue *txq; | |
689 | + spinlock_t *root_lock; | |
690 | + int users; | |
691 | + int retval = -EINVAL; | |
692 | + unsigned int orig_queue_index; | |
693 | + | |
694 | + dev->last_rx = jiffies; | |
695 | + | |
696 | + skb = entry->skb; | |
697 | + skb_orig = NULL; | |
698 | + | |
699 | + /* skb has owner? => make clone */ | |
700 | + if (unlikely(skb->destructor)) { | |
701 | + skb_orig = skb; | |
702 | + skb = skb_clone(skb, GFP_ATOMIC); | |
703 | + if (unlikely(!skb)) { | |
704 | + retval = -ENOMEM; | |
705 | + goto out; | |
706 | + } | |
707 | + skb->cb_next = NULL; | |
708 | + entry->skb = skb; | |
709 | + } | |
710 | + | |
711 | + skb->nf_queue_entry = entry; | |
712 | + | |
713 | + dev->stats.rx_bytes += skb->len; | |
714 | + dev->stats.rx_packets++; | |
715 | + | |
716 | + if (!skb->dev) { | |
717 | + /* skb->dev == NULL causes problems, try the find cause. */ | |
718 | + if (net_ratelimit()) { | |
719 | + dev_warn(&dev->dev, | |
720 | + "received packet with skb->dev == NULL\n"); | |
721 | + dump_stack(); | |
722 | + } | |
723 | + | |
724 | + skb->dev = dev; | |
725 | + } | |
726 | + | |
727 | + /* Disables softirqs for lock below */ | |
728 | + rcu_read_lock_bh(); | |
729 | + | |
730 | + /* Multi-queue selection */ | |
731 | + orig_queue_index = skb_get_queue_mapping(skb); | |
732 | + txq = imq_select_queue(dev, skb); | |
733 | + | |
734 | + q = rcu_dereference(txq->qdisc); | |
735 | + if (unlikely(!q->enqueue)) | |
736 | + goto packet_not_eaten_by_imq_dev; | |
737 | + | |
738 | + root_lock = qdisc_lock(q); | |
739 | + spin_lock(root_lock); | |
740 | + | |
741 | + users = atomic_read(&skb->users); | |
742 | + | |
743 | + skb_shared = skb_get(skb); /* increase reference count by one */ | |
744 | + | |
745 | + /* backup skb->cb, as qdisc layer will overwrite it */ | |
746 | + skb_save_cb(skb_shared); | |
747 | + qdisc_enqueue_root(skb_shared, q); /* might kfree_skb */ | |
748 | + | |
749 | + if (likely(atomic_read(&skb_shared->users) == users + 1)) { | |
750 | + kfree_skb(skb_shared); /* decrease reference count by one */ | |
751 | + | |
752 | + skb->destructor = &imq_skb_destructor; | |
753 | + | |
754 | + /* cloned? */ | |
755 | + if (unlikely(skb_orig)) | |
756 | + kfree_skb(skb_orig); /* free original */ | |
757 | + | |
758 | + spin_unlock(root_lock); | |
759 | + rcu_read_unlock_bh(); | |
760 | + | |
761 | + /* schedule qdisc dequeue */ | |
762 | + __netif_schedule(q); | |
763 | + | |
764 | + retval = 0; | |
765 | + goto out; | |
766 | + } else { | |
767 | + skb_restore_cb(skb_shared); /* restore skb->cb */ | |
768 | + skb->nf_queue_entry = NULL; | |
769 | + /* | |
770 | + * qdisc dropped packet and decreased skb reference count of | |
771 | + * skb, so we don't really want to and try refree as that would | |
772 | + * actually destroy the skb. | |
773 | + */ | |
774 | + spin_unlock(root_lock); | |
775 | + goto packet_not_eaten_by_imq_dev; | |
776 | + } | |
777 | + | |
778 | +packet_not_eaten_by_imq_dev: | |
779 | + skb_set_queue_mapping(skb, orig_queue_index); | |
780 | + rcu_read_unlock_bh(); | |
781 | + | |
782 | + /* cloned? restore original */ | |
783 | + if (unlikely(skb_orig)) { | |
784 | + kfree_skb(skb); | |
785 | + entry->skb = skb_orig; | |
786 | + } | |
787 | + retval = -1; | |
788 | +out: | |
789 | + return retval; | |
790 | +} | |
791 | + | |
792 | +static unsigned int imq_nf_hook(unsigned int hook, struct sk_buff *pskb, | |
793 | + const struct net_device *indev, | |
794 | + const struct net_device *outdev, | |
795 | + int (*okfn)(struct sk_buff *)) | |
796 | +{ | |
797 | + return (pskb->imq_flags & IMQ_F_ENQUEUE) ? NF_IMQ_QUEUE : NF_ACCEPT; | |
798 | +} | |
799 | + | |
800 | +static int imq_close(struct net_device *dev) | |
801 | +{ | |
802 | + netif_stop_queue(dev); | |
803 | + return 0; | |
804 | +} | |
805 | + | |
806 | +static int imq_open(struct net_device *dev) | |
807 | +{ | |
808 | + netif_start_queue(dev); | |
809 | + return 0; | |
810 | +} | |
811 | + | |
812 | +static const struct net_device_ops imq_netdev_ops = { | |
813 | + .ndo_open = imq_open, | |
814 | + .ndo_stop = imq_close, | |
815 | + .ndo_start_xmit = imq_dev_xmit, | |
816 | + .ndo_get_stats = imq_get_stats, | |
817 | +}; | |
818 | + | |
819 | +static void imq_setup(struct net_device *dev) | |
820 | +{ | |
821 | + dev->netdev_ops = &imq_netdev_ops; | |
822 | + dev->type = ARPHRD_VOID; | |
823 | + dev->mtu = 16000; /* too small? */ | |
824 | + dev->tx_queue_len = 11000; /* too big? */ | |
825 | + dev->flags = IFF_NOARP; | |
826 | + dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | | |
827 | + NETIF_F_GSO | NETIF_F_HW_CSUM | | |
828 | + NETIF_F_HIGHDMA; | |
829 | + dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | | |
830 | + IFF_TX_SKB_SHARING); | |
831 | +} | |
832 | + | |
833 | +static int imq_validate(struct nlattr *tb[], struct nlattr *data[]) | |
834 | +{ | |
835 | + int ret = 0; | |
836 | + | |
837 | + if (tb[IFLA_ADDRESS]) { | |
838 | + if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { | |
839 | + ret = -EINVAL; | |
840 | + goto end; | |
841 | + } | |
842 | + if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
843 | + ret = -EADDRNOTAVAIL; | |
844 | + goto end; | |
845 | + } | |
846 | + } | |
847 | + return 0; | |
848 | +end: | |
849 | + pr_warn("IMQ: imq_validate failed (%d)\n", ret); | |
850 | + return ret; | |
851 | +} | |
852 | + | |
853 | +static struct rtnl_link_ops imq_link_ops __read_mostly = { | |
854 | + .kind = "imq", | |
855 | + .priv_size = 0, | |
856 | + .setup = imq_setup, | |
857 | + .validate = imq_validate, | |
858 | +}; | |
859 | + | |
860 | +static const struct nf_queue_handler imq_nfqh = { | |
861 | + .outfn = imq_nf_queue, | |
862 | +}; | |
863 | + | |
864 | +static int __init imq_init_hooks(void) | |
865 | +{ | |
866 | + int ret; | |
867 | + | |
868 | + nf_register_queue_imq_handler(&imq_nfqh); | |
869 | + | |
870 | + ret = nf_register_hooks(imq_ops, ARRAY_SIZE(imq_ops)); | |
871 | + if (ret < 0) | |
872 | + nf_unregister_queue_imq_handler(); | |
873 | + | |
874 | + return ret; | |
875 | +} | |
876 | + | |
877 | +static int __init imq_init_one(int index) | |
878 | +{ | |
879 | + struct net_device *dev; | |
880 | + int ret; | |
881 | + | |
882 | + dev = alloc_netdev_mq(0, "imq%d", imq_setup, numqueues); | |
883 | + if (!dev) | |
884 | + return -ENOMEM; | |
885 | + | |
886 | + ret = dev_alloc_name(dev, dev->name); | |
887 | + if (ret < 0) | |
888 | + goto fail; | |
889 | + | |
890 | + dev->rtnl_link_ops = &imq_link_ops; | |
891 | + ret = register_netdevice(dev); | |
892 | + if (ret < 0) | |
893 | + goto fail; | |
894 | + | |
895 | + return 0; | |
896 | +fail: | |
897 | + free_netdev(dev); | |
898 | + return ret; | |
899 | +} | |
900 | + | |
901 | +static int __init imq_init_devs(void) | |
902 | +{ | |
903 | + int err, i; | |
904 | + | |
905 | + if (numdevs < 1 || numdevs > IMQ_MAX_DEVS) { | |
906 | + pr_err("IMQ: numdevs has to be betweed 1 and %u\n", | |
907 | + IMQ_MAX_DEVS); | |
908 | + return -EINVAL; | |
909 | + } | |
910 | + | |
911 | + if (numqueues < 1 || numqueues > IMQ_MAX_QUEUES) { | |
912 | + pr_err("IMQ: numqueues has to be betweed 1 and %u\n", | |
913 | + IMQ_MAX_QUEUES); | |
914 | + return -EINVAL; | |
915 | + } | |
916 | + | |
917 | + get_random_bytes(&imq_hashrnd, sizeof(imq_hashrnd)); | |
918 | + | |
919 | + rtnl_lock(); | |
920 | + err = __rtnl_link_register(&imq_link_ops); | |
921 | + | |
922 | + for (i = 0; i < numdevs && !err; i++) | |
923 | + err = imq_init_one(i); | |
924 | + | |
925 | + if (err) { | |
926 | + __rtnl_link_unregister(&imq_link_ops); | |
927 | + memset(imq_devs_cache, 0, sizeof(imq_devs_cache)); | |
928 | + } | |
929 | + rtnl_unlock(); | |
930 | + | |
931 | + return err; | |
932 | +} | |
933 | + | |
934 | +static int __init imq_init_module(void) | |
935 | +{ | |
936 | + int err; | |
937 | + | |
938 | +#if defined(CONFIG_IMQ_NUM_DEVS) | |
939 | + BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS > 16); | |
940 | + BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS < 2); | |
941 | + BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS - 1 > IMQ_F_IFMASK); | |
942 | +#endif | |
943 | + | |
944 | + err = imq_init_devs(); | |
945 | + if (err) { | |
946 | + pr_err("IMQ: Error trying imq_init_devs(net)\n"); | |
947 | + return err; | |
948 | + } | |
949 | + | |
950 | + err = imq_init_hooks(); | |
951 | + if (err) { | |
952 | + pr_err(KERN_ERR "IMQ: Error trying imq_init_hooks()\n"); | |
953 | + rtnl_link_unregister(&imq_link_ops); | |
954 | + memset(imq_devs_cache, 0, sizeof(imq_devs_cache)); | |
955 | + return err; | |
956 | + } | |
957 | + | |
958 | + pr_info("IMQ driver loaded successfully. (numdevs = %d, numqueues = %d)\n", | |
959 | + numdevs, numqueues); | |
960 | + | |
961 | +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB) | |
962 | + pr_info("\tHooking IMQ before NAT on PREROUTING.\n"); | |
963 | +#else | |
964 | + pr_info("\tHooking IMQ after NAT on PREROUTING.\n"); | |
965 | +#endif | |
966 | +#if defined(CONFIG_IMQ_BEHAVIOR_AB) || defined(CONFIG_IMQ_BEHAVIOR_BB) | |
967 | + pr_info("\tHooking IMQ before NAT on POSTROUTING.\n"); | |
968 | +#else | |
969 | + pr_info("\tHooking IMQ after NAT on POSTROUTING.\n"); | |
970 | +#endif | |
971 | + | |
972 | + return 0; | |
973 | +} | |
974 | + | |
975 | +static void __exit imq_unhook(void) | |
976 | +{ | |
977 | + nf_unregister_hooks(imq_ops, ARRAY_SIZE(imq_ops)); | |
978 | + nf_unregister_queue_imq_handler(); | |
979 | +} | |
980 | + | |
981 | +static void __exit imq_cleanup_devs(void) | |
982 | +{ | |
983 | + rtnl_link_unregister(&imq_link_ops); | |
984 | + memset(imq_devs_cache, 0, sizeof(imq_devs_cache)); | |
985 | +} | |
986 | + | |
987 | +static void __exit imq_exit_module(void) | |
988 | +{ | |
989 | + imq_unhook(); | |
990 | + imq_cleanup_devs(); | |
991 | + pr_info("IMQ driver unloaded successfully.\n"); | |
992 | +} | |
993 | + | |
994 | +module_init(imq_init_module); | |
995 | +module_exit(imq_exit_module); | |
996 | + | |
997 | +module_param(numdevs, int, 0); | |
998 | +module_param(numqueues, int, 0); | |
999 | +MODULE_PARM_DESC(numdevs, "number of IMQ devices (how many imq* devices will be created)"); | |
1000 | +MODULE_PARM_DESC(numqueues, "number of queues per IMQ device"); | |
1001 | +MODULE_AUTHOR("http://www.linuximq.net"); | |
1002 | +MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See http://www.linuximq.net/ for more information."); | |
1003 | +MODULE_LICENSE("GPL"); | |
1004 | +MODULE_ALIAS_RTNL_LINK("imq"); | |
1005 | + | |
1006 | diff -Naur linux-3.10.30.org/drivers/net/Kconfig linux-3.10.30/drivers/net/Kconfig | |
1007 | --- linux-3.10.30.org/drivers/net/Kconfig 2014-02-13 22:48:15.000000000 +0100 | |
1008 | +++ linux-3.10.30/drivers/net/Kconfig 2014-02-14 20:29:05.379402305 +0100 | |
1009 | @@ -207,6 +207,125 @@ | |
1010 | depends on RIONET | |
1011 | default "128" | |
1012 | ||
1013 | +config IMQ | |
1014 | + tristate "IMQ (intermediate queueing device) support" | |
1015 | + depends on NETDEVICES && NETFILTER | |
1016 | + ---help--- | |
1017 | + The IMQ device(s) is used as placeholder for QoS queueing | |
1018 | + disciplines. Every packet entering/leaving the IP stack can be | |
1019 | + directed through the IMQ device where it's enqueued/dequeued to the | |
1020 | + attached qdisc. This allows you to treat network devices as classes | |
1021 | + and distribute bandwidth among them. Iptables is used to specify | |
1022 | + through which IMQ device, if any, packets travel. | |
1023 | + | |
1024 | + More information at: http://www.linuximq.net/ | |
1025 | + | |
1026 | + To compile this driver as a module, choose M here: the module | |
1027 | + will be called imq. If unsure, say N. | |
1028 | + | |
1029 | +choice | |
1030 | + prompt "IMQ behavior (PRE/POSTROUTING)" | |
1031 | + depends on IMQ | |
1032 | + default IMQ_BEHAVIOR_AB | |
1033 | + help | |
1034 | + This setting defines how IMQ behaves in respect to its | |
1035 | + hooking in PREROUTING and POSTROUTING. | |
1036 | + | |
1037 | + IMQ can work in any of the following ways: | |
1038 | + | |
1039 | + PREROUTING | POSTROUTING | |
1040 | + -----------------|------------------- | |
1041 | + #1 After NAT | After NAT | |
1042 | + #2 After NAT | Before NAT | |
1043 | + #3 Before NAT | After NAT | |
1044 | + #4 Before NAT | Before NAT | |
1045 | + | |
1046 | + The default behavior is to hook before NAT on PREROUTING | |
1047 | + and after NAT on POSTROUTING (#3). | |
1048 | + | |
1049 | + This settings are specially usefull when trying to use IMQ | |
1050 | + to shape NATed clients. | |
1051 | + | |
1052 | + More information can be found at: www.linuximq.net | |
1053 | + | |
1054 | + If not sure leave the default settings alone. | |
1055 | + | |
1056 | +config IMQ_BEHAVIOR_AA | |
1057 | + bool "IMQ AA" | |
1058 | + help | |
1059 | + This setting defines how IMQ behaves in respect to its | |
1060 | + hooking in PREROUTING and POSTROUTING. | |
1061 | + | |
1062 | + Choosing this option will make IMQ hook like this: | |
1063 | + | |
1064 | + PREROUTING: After NAT | |
1065 | + POSTROUTING: After NAT | |
1066 | + | |
1067 | + More information can be found at: www.linuximq.net | |
1068 | + | |
1069 | + If not sure leave the default settings alone. | |
1070 | + | |
1071 | +config IMQ_BEHAVIOR_AB | |
1072 | + bool "IMQ AB" | |
1073 | + help | |
1074 | + This setting defines how IMQ behaves in respect to its | |
1075 | + hooking in PREROUTING and POSTROUTING. | |
1076 | + | |
1077 | + Choosing this option will make IMQ hook like this: | |
1078 | + | |
1079 | + PREROUTING: After NAT | |
1080 | + POSTROUTING: Before NAT | |
1081 | + | |
1082 | + More information can be found at: www.linuximq.net | |
1083 | + | |
1084 | + If not sure leave the default settings alone. | |
1085 | + | |
1086 | +config IMQ_BEHAVIOR_BA | |
1087 | + bool "IMQ BA" | |
1088 | + help | |
1089 | + This setting defines how IMQ behaves in respect to its | |
1090 | + hooking in PREROUTING and POSTROUTING. | |
1091 | + | |
1092 | + Choosing this option will make IMQ hook like this: | |
1093 | + | |
1094 | + PREROUTING: Before NAT | |
1095 | + POSTROUTING: After NAT | |
1096 | + | |
1097 | + More information can be found at: www.linuximq.net | |
1098 | + | |
1099 | + If not sure leave the default settings alone. | |
1100 | + | |
1101 | +config IMQ_BEHAVIOR_BB | |
1102 | + bool "IMQ BB" | |
1103 | + help | |
1104 | + This setting defines how IMQ behaves in respect to its | |
1105 | + hooking in PREROUTING and POSTROUTING. | |
1106 | + | |
1107 | + Choosing this option will make IMQ hook like this: | |
1108 | + | |
1109 | + PREROUTING: Before NAT | |
1110 | + POSTROUTING: Before NAT | |
1111 | + | |
1112 | + More information can be found at: www.linuximq.net | |
1113 | + | |
1114 | + If not sure leave the default settings alone. | |
1115 | + | |
1116 | +endchoice | |
1117 | + | |
1118 | +config IMQ_NUM_DEVS | |
1119 | + int "Number of IMQ devices" | |
1120 | + range 2 16 | |
1121 | + depends on IMQ | |
1122 | + default "16" | |
1123 | + help | |
1124 | + This setting defines how many IMQ devices will be created. | |
1125 | + | |
1126 | + The default value is 16. | |
1127 | + | |
1128 | + More information can be found at: www.linuximq.net | |
1129 | + | |
1130 | + If not sure leave the default settings alone. | |
1131 | + | |
1132 | config TUN | |
1133 | tristate "Universal TUN/TAP device driver support" | |
1134 | select CRC32 | |
1135 | diff -Naur linux-3.10.30.org/drivers/net/Makefile linux-3.10.30/drivers/net/Makefile | |
1136 | --- linux-3.10.30.org/drivers/net/Makefile 2014-02-13 22:48:15.000000000 +0100 | |
1137 | +++ linux-3.10.30/drivers/net/Makefile 2014-02-14 20:29:05.379402305 +0100 | |
1138 | @@ -9,6 +9,7 @@ | |
1139 | obj-$(CONFIG_DUMMY) += dummy.o | |
1140 | obj-$(CONFIG_EQUALIZER) += eql.o | |
1141 | obj-$(CONFIG_IFB) += ifb.o | |
1142 | +obj-$(CONFIG_IMQ) += imq.o | |
1143 | obj-$(CONFIG_MACVLAN) += macvlan.o | |
1144 | obj-$(CONFIG_MACVTAP) += macvtap.o | |
1145 | obj-$(CONFIG_MII) += mii.o | |
1146 | diff -Naur linux-3.10.30.org/include/linux/imq.h linux-3.10.30/include/linux/imq.h | |
1147 | --- linux-3.10.30.org/include/linux/imq.h 1970-01-01 01:00:00.000000000 +0100 | |
1148 | +++ linux-3.10.30/include/linux/imq.h 2014-02-14 20:29:05.379402305 +0100 | |
1149 | @@ -0,0 +1,13 @@ | |
1150 | +#ifndef _IMQ_H | |
1151 | +#define _IMQ_H | |
1152 | + | |
1153 | +/* IFMASK (16 device indexes, 0 to 15) and flag(s) fit in 5 bits */ | |
1154 | +#define IMQ_F_BITS 5 | |
1155 | + | |
1156 | +#define IMQ_F_IFMASK 0x0f | |
1157 | +#define IMQ_F_ENQUEUE 0x10 | |
1158 | + | |
1159 | +#define IMQ_MAX_DEVS (IMQ_F_IFMASK + 1) | |
1160 | + | |
1161 | +#endif /* _IMQ_H */ | |
1162 | + | |
1163 | diff -Naur linux-3.10.30.org/include/linux/netfilter/xt_IMQ.h linux-3.10.30/include/linux/netfilter/xt_IMQ.h | |
1164 | --- linux-3.10.30.org/include/linux/netfilter/xt_IMQ.h 1970-01-01 01:00:00.000000000 +0100 | |
1165 | +++ linux-3.10.30/include/linux/netfilter/xt_IMQ.h 2014-02-14 20:29:05.379402305 +0100 | |
1166 | @@ -0,0 +1,9 @@ | |
1167 | +#ifndef _XT_IMQ_H | |
1168 | +#define _XT_IMQ_H | |
1169 | + | |
1170 | +struct xt_imq_info { | |
1171 | + unsigned int todev; /* target imq device */ | |
1172 | +}; | |
1173 | + | |
1174 | +#endif /* _XT_IMQ_H */ | |
1175 | + | |
1176 | diff -Naur linux-3.10.30.org/include/linux/netfilter_ipv4/ipt_IMQ.h linux-3.10.30/include/linux/netfilter_ipv4/ipt_IMQ.h | |
1177 | --- linux-3.10.30.org/include/linux/netfilter_ipv4/ipt_IMQ.h 1970-01-01 01:00:00.000000000 +0100 | |
1178 | +++ linux-3.10.30/include/linux/netfilter_ipv4/ipt_IMQ.h 2014-02-14 20:29:05.379402305 +0100 | |
1179 | @@ -0,0 +1,10 @@ | |
1180 | +#ifndef _IPT_IMQ_H | |
1181 | +#define _IPT_IMQ_H | |
1182 | + | |
1183 | +/* Backwards compatibility for old userspace */ | |
1184 | +#include <linux/netfilter/xt_IMQ.h> | |
1185 | + | |
1186 | +#define ipt_imq_info xt_imq_info | |
1187 | + | |
1188 | +#endif /* _IPT_IMQ_H */ | |
1189 | + | |
1190 | diff -Naur linux-3.10.30.org/include/linux/netfilter_ipv6/ip6t_IMQ.h linux-3.10.30/include/linux/netfilter_ipv6/ip6t_IMQ.h | |
1191 | --- linux-3.10.30.org/include/linux/netfilter_ipv6/ip6t_IMQ.h 1970-01-01 01:00:00.000000000 +0100 | |
1192 | +++ linux-3.10.30/include/linux/netfilter_ipv6/ip6t_IMQ.h 2014-02-14 20:29:05.379402305 +0100 | |
1193 | @@ -0,0 +1,10 @@ | |
1194 | +#ifndef _IP6T_IMQ_H | |
1195 | +#define _IP6T_IMQ_H | |
1196 | + | |
1197 | +/* Backwards compatibility for old userspace */ | |
1198 | +#include <linux/netfilter/xt_IMQ.h> | |
1199 | + | |
1200 | +#define ip6t_imq_info xt_imq_info | |
1201 | + | |
1202 | +#endif /* _IP6T_IMQ_H */ | |
1203 | + | |
1204 | diff -Naur linux-3.10.30.org/include/linux/skbuff.h linux-3.10.30/include/linux/skbuff.h | |
1205 | --- linux-3.10.30.org/include/linux/skbuff.h 2014-02-13 22:48:15.000000000 +0100 | |
1206 | +++ linux-3.10.30/include/linux/skbuff.h 2014-02-14 20:29:05.379402305 +0100 | |
1207 | @@ -33,6 +33,9 @@ | |
1208 | #include <linux/dma-mapping.h> | |
1209 | #include <linux/netdev_features.h> | |
1210 | #include <net/flow_keys.h> | |
1211 | +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) | |
1212 | +#include <linux/imq.h> | |
1213 | +#endif | |
1214 | ||
1215 | /* Don't change this without changing skb_csum_unnecessary! */ | |
1216 | #define CHECKSUM_NONE 0 | |
1217 | @@ -414,6 +417,9 @@ | |
1218 | * first. This is owned by whoever has the skb queued ATM. | |
1219 | */ | |
1220 | char cb[48] __aligned(8); | |
1221 | +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) | |
1222 | + void *cb_next; | |
1223 | +#endif | |
1224 | ||
1225 | unsigned long _skb_refdst; | |
1226 | #ifdef CONFIG_XFRM | |
1227 | @@ -449,6 +455,9 @@ | |
1228 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) | |
1229 | struct nf_conntrack *nfct; | |
1230 | #endif | |
1231 | +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) | |
1232 | + struct nf_queue_entry *nf_queue_entry; | |
1233 | +#endif | |
1234 | #ifdef CONFIG_BRIDGE_NETFILTER | |
1235 | struct nf_bridge_info *nf_bridge; | |
1236 | #endif | |
1237 | @@ -487,7 +496,9 @@ | |
1238 | __u8 encapsulation:1; | |
1239 | /* 7/9 bit hole (depending on ndisc_nodetype presence) */ | |
1240 | kmemcheck_bitfield_end(flags2); | |
1241 | - | |
1242 | +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) | |
1243 | + __u8 imq_flags:IMQ_F_BITS; | |
1244 | +#endif | |
1245 | #ifdef CONFIG_NET_DMA | |
1246 | dma_cookie_t dma_cookie; | |
1247 | #endif | |
1248 | @@ -616,7 +627,10 @@ | |
1249 | { | |
1250 | return (struct rtable *)skb_dst(skb); | |
1251 | } | |
1252 | - | |
1253 | +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) | |
1254 | +extern int skb_save_cb(struct sk_buff *skb); | |
1255 | +extern int skb_restore_cb(struct sk_buff *skb); | |
1256 | +#endif | |
1257 | extern void kfree_skb(struct sk_buff *skb); | |
1258 | extern void kfree_skb_list(struct sk_buff *segs); | |
1259 | extern void skb_tx_error(struct sk_buff *skb); | |
1260 | @@ -2735,6 +2749,10 @@ | |
1261 | nf_conntrack_get(src->nfct); | |
1262 | dst->nfctinfo = src->nfctinfo; | |
1263 | #endif | |
1264 | +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) | |
1265 | + dst->imq_flags = src->imq_flags; | |
1266 | + dst->nf_queue_entry = src->nf_queue_entry; | |
1267 | +#endif | |
1268 | #ifdef CONFIG_BRIDGE_NETFILTER | |
1269 | dst->nf_bridge = src->nf_bridge; | |
1270 | nf_bridge_get(src->nf_bridge); | |
1271 | diff -Naur linux-3.10.30.org/include/net/netfilter/nf_queue.h linux-3.10.30/include/net/netfilter/nf_queue.h | |
1272 | --- linux-3.10.30.org/include/net/netfilter/nf_queue.h 2014-02-13 22:48:15.000000000 +0100 | |
1273 | +++ linux-3.10.30/include/net/netfilter/nf_queue.h 2014-02-14 20:29:05.382736249 +0100 | |
1274 | @@ -29,6 +29,12 @@ | |
1275 | void nf_register_queue_handler(const struct nf_queue_handler *qh); | |
1276 | void nf_unregister_queue_handler(void); | |
1277 | extern void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict); | |
1278 | +extern void nf_queue_entry_release_refs(struct nf_queue_entry *entry); | |
1279 | + | |
1280 | +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) | |
1281 | +extern void nf_register_queue_imq_handler(const struct nf_queue_handler *qh); | |
1282 | +extern void nf_unregister_queue_imq_handler(void); | |
1283 | +#endif | |
1284 | ||
1285 | bool nf_queue_entry_get_refs(struct nf_queue_entry *entry); | |
1286 | void nf_queue_entry_release_refs(struct nf_queue_entry *entry); | |
1287 | diff -Naur linux-3.10.30.org/include/uapi/linux/netfilter.h linux-3.10.30/include/uapi/linux/netfilter.h | |
1288 | --- linux-3.10.30.org/include/uapi/linux/netfilter.h 2014-02-13 22:48:15.000000000 +0100 | |
1289 | +++ linux-3.10.30/include/uapi/linux/netfilter.h 2014-02-14 20:29:05.382736249 +0100 | |
1290 | @@ -13,7 +13,8 @@ | |
1291 | #define NF_QUEUE 3 | |
1292 | #define NF_REPEAT 4 | |
1293 | #define NF_STOP 5 | |
1294 | -#define NF_MAX_VERDICT NF_STOP | |
1295 | +#define NF_IMQ_QUEUE 6 | |
1296 | +#define NF_MAX_VERDICT NF_IMQ_QUEUE | |
1297 | ||
1298 | /* we overload the higher bits for encoding auxiliary data such as the queue | |
1299 | * number or errno values. Not nice, but better than additional function | |
1300 | diff -Naur linux-3.10.30.org/net/core/dev.c linux-3.10.30/net/core/dev.c | |
1301 | --- linux-3.10.30.org/net/core/dev.c 2014-02-13 22:48:15.000000000 +0100 | |
1302 | +++ linux-3.10.30/net/core/dev.c 2014-02-14 20:29:05.382736249 +0100 | |
1303 | @@ -129,6 +129,9 @@ | |
1304 | #include <linux/inetdevice.h> | |
1305 | #include <linux/cpu_rmap.h> | |
1306 | #include <linux/static_key.h> | |
1307 | +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) | |
1308 | +#include <linux/imq.h> | |
1309 | +#endif | |
1310 | ||
1311 | #include "net-sysfs.h" | |
1312 | ||
1313 | @@ -2573,7 +2576,12 @@ | |
1314 | } | |
1315 | } | |
1316 | ||
1317 | +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) | |
1318 | + if (!list_empty(&ptype_all) && | |
1319 | + !(skb->imq_flags & IMQ_F_ENQUEUE)) | |
1320 | +#else | |
1321 | if (!list_empty(&ptype_all)) | |
1322 | +#endif | |
1323 | dev_queue_xmit_nit(skb, dev); | |
1324 | ||
1325 | skb_len = skb->len; | |
1326 | diff -Naur linux-3.10.30.org/net/core/skbuff.c linux-3.10.30/net/core/skbuff.c | |
1327 | --- linux-3.10.30.org/net/core/skbuff.c 2014-02-13 22:48:15.000000000 +0100 | |
1328 | +++ linux-3.10.30/net/core/skbuff.c 2014-02-14 21:47:17.286039229 +0100 | |
1329 | @@ -73,6 +73,9 @@ | |
1330 | ||
1331 | struct kmem_cache *skbuff_head_cache __read_mostly; | |
1332 | static struct kmem_cache *skbuff_fclone_cache __read_mostly; | |
1333 | +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) | |
1334 | +static struct kmem_cache *skbuff_cb_store_cache __read_mostly; | |
1335 | +#endif | |
1336 | ||
1337 | /** | |
1338 | * skb_panic - private function for out-of-line support | |
1339 | @@ -552,6 +555,29 @@ | |
1340 | WARN_ON(in_irq()); | |
1341 | skb->destructor(skb); | |
1342 | } | |
1343 | +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) | |
1344 | + /* | |
1345 | + * This should not happen. When it does, avoid memleak by restoring | |
1346 | + * the chain of cb-backups. | |
1347 | + */ | |
1348 | + while (skb->cb_next != NULL) { | |
1349 | + if (net_ratelimit()) | |
1350 | + pr_warn("IMQ: kfree_skb: skb->cb_next: %08x\n", | |
1351 | + (unsigned int)skb->cb_next); | |
1352 | + | |
1353 | + skb_restore_cb(skb); | |
1354 | + } | |
1355 | + /* | |
1356 | + * This should not happen either, nf_queue_entry is nullified in | |
1357 | + * imq_dev_xmit(). If we have non-NULL nf_queue_entry then we are | |
1358 | + * leaking entry pointers, maybe memory. We don't know if this is | |
1359 | + * pointer to already freed memory, or should this be freed. | |
1360 | + * If this happens we need to add refcounting, etc for nf_queue_entry. | |
1361 | + */ | |
1362 | + if (skb->nf_queue_entry && net_ratelimit()) | |
1363 | + pr_warn("%s\n", "IMQ: kfree_skb: skb->nf_queue_entry != NULL"); | |
1364 | +#endif | |
1365 | + | |
1366 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) | |
1367 | nf_conntrack_put(skb->nfct); | |
1368 | #endif | |
1369 | @@ -683,6 +709,10 @@ | |
1370 | new->sp = secpath_get(old->sp); | |
1371 | #endif | |
1372 | memcpy(new->cb, old->cb, sizeof(old->cb)); | |
1373 | +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) | |
1374 | + new->cb_next = NULL; | |
1375 | + /*skb_copy_stored_cb(new, old);*/ | |
1376 | +#endif | |
1377 | new->csum = old->csum; | |
1378 | new->local_df = old->local_df; | |
1379 | new->pkt_type = old->pkt_type; | |
1380 | @@ -3050,6 +3080,15 @@ | |
1381 | } | |
1382 | EXPORT_SYMBOL_GPL(skb_gro_receive); | |
1383 | ||
1384 | +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) | |
1385 | +/* Control buffer save/restore for IMQ devices */ | |
1386 | +struct skb_cb_table { | |
1387 | + char cb[48] __aligned(8); | |
1388 | + void *cb_next; | |
1389 | + atomic_t refcnt; | |
1390 | +}; | |
1391 | +#endif | |
1392 | + | |
1393 | void __init skb_init(void) | |
1394 | { | |
1395 | skbuff_head_cache = kmem_cache_create("skbuff_head_cache", | |
1396 | @@ -3063,6 +3102,13 @@ | |
1397 | 0, | |
1398 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, | |
1399 | NULL); | |
1400 | +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) | |
1401 | + skbuff_cb_store_cache = kmem_cache_create("skbuff_cb_store_cache", | |
1402 | + sizeof(struct skb_cb_table), | |
1403 | + 0, | |
1404 | + SLAB_HWCACHE_ALIGN|SLAB_PANIC, | |
1405 | + NULL); | |
1406 | +#endif | |
1407 | } | |
1408 | ||
1409 | /** | |
1410 | @@ -3348,6 +3394,76 @@ | |
1411 | EXPORT_SYMBOL_GPL(skb_complete_wifi_ack); | |
1412 | ||
1413 | ||
1414 | +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) | |
1415 | +static DEFINE_SPINLOCK(skb_cb_store_lock); | |
1416 | + | |
1417 | +int skb_save_cb(struct sk_buff *skb) | |
1418 | +{ | |
1419 | + struct skb_cb_table *next; | |
1420 | + | |
1421 | + next = kmem_cache_alloc(skbuff_cb_store_cache, GFP_ATOMIC); | |
1422 | + if (!next) | |
1423 | + return -ENOMEM; | |
1424 | + | |
1425 | + BUILD_BUG_ON(sizeof(skb->cb) != sizeof(next->cb)); | |
1426 | + | |
1427 | + memcpy(next->cb, skb->cb, sizeof(skb->cb)); | |
1428 | + next->cb_next = skb->cb_next; | |
1429 | + | |
1430 | + atomic_set(&next->refcnt, 1); | |
1431 | + | |
1432 | + skb->cb_next = next; | |
1433 | + return 0; | |
1434 | +} | |
1435 | +EXPORT_SYMBOL(skb_save_cb); | |
1436 | + | |
1437 | +int skb_restore_cb(struct sk_buff *skb) | |
1438 | +{ | |
1439 | + struct skb_cb_table *next; | |
1440 | + | |
1441 | + if (!skb->cb_next) | |
1442 | + return 0; | |
1443 | + | |
1444 | + next = skb->cb_next; | |
1445 | + | |
1446 | + BUILD_BUG_ON(sizeof(skb->cb) != sizeof(next->cb)); | |
1447 | + | |
1448 | + memcpy(skb->cb, next->cb, sizeof(skb->cb)); | |
1449 | + skb->cb_next = next->cb_next; | |
1450 | + | |
1451 | + spin_lock(&skb_cb_store_lock); | |
1452 | + | |
1453 | + if (atomic_dec_and_test(&next->refcnt)) | |
1454 | + kmem_cache_free(skbuff_cb_store_cache, next); | |
1455 | + | |
1456 | + spin_unlock(&skb_cb_store_lock); | |
1457 | + | |
1458 | + return 0; | |
1459 | +} | |
1460 | +EXPORT_SYMBOL(skb_restore_cb); | |
1461 | + | |
1462 | +static void skb_copy_stored_cb(struct sk_buff *new, const struct sk_buff *__old) | |
1463 | +{ | |
1464 | + struct skb_cb_table *next; | |
1465 | + struct sk_buff *old; | |
1466 | + | |
1467 | + if (!__old->cb_next) { | |
1468 | + new->cb_next = NULL; | |
1469 | + return; | |
1470 | + } | |
1471 | + | |
1472 | + spin_lock(&skb_cb_store_lock); | |
1473 | + | |
1474 | + old = (struct sk_buff *)__old; | |
1475 | + | |
1476 | + next = old->cb_next; | |
1477 | + atomic_inc(&next->refcnt); | |
1478 | + new->cb_next = next; | |
1479 | + | |
1480 | + spin_unlock(&skb_cb_store_lock); | |
1481 | +} | |
1482 | +#endif | |
1483 | + | |
1484 | /** | |
1485 | * skb_partial_csum_set - set up and verify partial csum values for packet | |
1486 | * @skb: the skb to set | |
1487 | diff -Naur linux-3.10.30.org/net/ipv6/ip6_output.c linux-3.10.30/net/ipv6/ip6_output.c | |
1488 | --- linux-3.10.30.org/net/ipv6/ip6_output.c 2014-02-13 22:48:15.000000000 +0100 | |
1489 | +++ linux-3.10.30/net/ipv6/ip6_output.c 2014-02-14 20:29:05.392738001 +0100 | |
1490 | @@ -89,9 +89,6 @@ | |
1491 | struct in6_addr *nexthop; | |
1492 | int ret; | |
1493 | ||
1494 | - skb->protocol = htons(ETH_P_IPV6); | |
1495 | - skb->dev = dev; | |
1496 | - | |
1497 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) { | |
1498 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); | |
1499 | ||
1500 | @@ -168,6 +165,13 @@ | |
1501 | return 0; | |
1502 | } | |
1503 | ||
1504 | + /* | |
1505 | + * IMQ-patch: moved setting skb->dev and skb->protocol from | |
1506 | + * ip6_finish_output2 to fix crashing at netif_skb_features(). | |
1507 | + */ | |
1508 | + skb->protocol = htons(ETH_P_IPV6); | |
1509 | + skb->dev = dev; | |
1510 | + | |
1511 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL, dev, | |
1512 | ip6_finish_output, | |
1513 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
1514 | diff -Naur linux-3.10.30.org/net/ipv6/ip6_output.c.orig linux-3.10.30/net/ipv6/ip6_output.c.orig | |
1515 | --- linux-3.10.30.org/net/ipv6/ip6_output.c.orig 1970-01-01 01:00:00.000000000 +0100 | |
1516 | +++ linux-3.10.30/net/ipv6/ip6_output.c.orig 2014-02-14 20:29:05.392738001 +0100 | |
1517 | @@ -0,0 +1,1580 @@ | |
1518 | +/* | |
1519 | + * IPv6 output functions | |
1520 | + * Linux INET6 implementation | |
1521 | + * | |
1522 | + * Authors: | |
1523 | + * Pedro Roque <roque@di.fc.ul.pt> | |
1524 | + * | |
1525 | + * Based on linux/net/ipv4/ip_output.c | |
1526 | + * | |
1527 | + * This program is free software; you can redistribute it and/or | |
1528 | + * modify it under the terms of the GNU General Public License | |
1529 | + * as published by the Free Software Foundation; either version | |
1530 | + * 2 of the License, or (at your option) any later version. | |
1531 | + * | |
1532 | + * Changes: | |
1533 | + * A.N.Kuznetsov : airthmetics in fragmentation. | |
1534 | + * extension headers are implemented. | |
1535 | + * route changes now work. | |
1536 | + * ip6_forward does not confuse sniffers. | |
1537 | + * etc. | |
1538 | + * | |
1539 | + * H. von Brand : Added missing #include <linux/string.h> | |
1540 | + * Imran Patel : frag id should be in NBO | |
1541 | + * Kazunori MIYAZAWA @USAGI | |
1542 | + * : add ip6_append_data and related functions | |
1543 | + * for datagram xmit | |
1544 | + */ | |
1545 | + | |
1546 | +#include <linux/errno.h> | |
1547 | +#include <linux/kernel.h> | |
1548 | +#include <linux/string.h> | |
1549 | +#include <linux/socket.h> | |
1550 | +#include <linux/net.h> | |
1551 | +#include <linux/netdevice.h> | |
1552 | +#include <linux/if_arp.h> | |
1553 | +#include <linux/in6.h> | |
1554 | +#include <linux/tcp.h> | |
1555 | +#include <linux/route.h> | |
1556 | +#include <linux/module.h> | |
1557 | +#include <linux/slab.h> | |
1558 | + | |
1559 | +#include <linux/netfilter.h> | |
1560 | +#include <linux/netfilter_ipv6.h> | |
1561 | + | |
1562 | +#include <net/sock.h> | |
1563 | +#include <net/snmp.h> | |
1564 | + | |
1565 | +#include <net/ipv6.h> | |
1566 | +#include <net/ndisc.h> | |
1567 | +#include <net/protocol.h> | |
1568 | +#include <net/ip6_route.h> | |
1569 | +#include <net/addrconf.h> | |
1570 | +#include <net/rawv6.h> | |
1571 | +#include <net/icmp.h> | |
1572 | +#include <net/xfrm.h> | |
1573 | +#include <net/checksum.h> | |
1574 | +#include <linux/mroute6.h> | |
1575 | + | |
1576 | +int __ip6_local_out(struct sk_buff *skb) | |
1577 | +{ | |
1578 | + int len; | |
1579 | + | |
1580 | + len = skb->len - sizeof(struct ipv6hdr); | |
1581 | + if (len > IPV6_MAXPLEN) | |
1582 | + len = 0; | |
1583 | + ipv6_hdr(skb)->payload_len = htons(len); | |
1584 | + | |
1585 | + return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, | |
1586 | + skb_dst(skb)->dev, dst_output); | |
1587 | +} | |
1588 | + | |
1589 | +int ip6_local_out(struct sk_buff *skb) | |
1590 | +{ | |
1591 | + int err; | |
1592 | + | |
1593 | + err = __ip6_local_out(skb); | |
1594 | + if (likely(err == 1)) | |
1595 | + err = dst_output(skb); | |
1596 | + | |
1597 | + return err; | |
1598 | +} | |
1599 | +EXPORT_SYMBOL_GPL(ip6_local_out); | |
1600 | + | |
1601 | +static int ip6_finish_output2(struct sk_buff *skb) | |
1602 | +{ | |
1603 | + struct dst_entry *dst = skb_dst(skb); | |
1604 | + struct net_device *dev = dst->dev; | |
1605 | + struct neighbour *neigh; | |
1606 | + struct in6_addr *nexthop; | |
1607 | + int ret; | |
1608 | + | |
1609 | + skb->protocol = htons(ETH_P_IPV6); | |
1610 | + skb->dev = dev; | |
1611 | + | |
1612 | + if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) { | |
1613 | + struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); | |
1614 | + | |
1615 | + if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(skb->sk) && | |
1616 | + ((mroute6_socket(dev_net(dev), skb) && | |
1617 | + !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) || | |
1618 | + ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr, | |
1619 | + &ipv6_hdr(skb)->saddr))) { | |
1620 | + struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); | |
1621 | + | |
1622 | + /* Do not check for IFF_ALLMULTI; multicast routing | |
1623 | + is not supported in any case. | |
1624 | + */ | |
1625 | + if (newskb) | |
1626 | + NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING, | |
1627 | + newskb, NULL, newskb->dev, | |
1628 | + dev_loopback_xmit); | |
1629 | + | |
1630 | + if (ipv6_hdr(skb)->hop_limit == 0) { | |
1631 | + IP6_INC_STATS(dev_net(dev), idev, | |
1632 | + IPSTATS_MIB_OUTDISCARDS); | |
1633 | + kfree_skb(skb); | |
1634 | + return 0; | |
1635 | + } | |
1636 | + } | |
1637 | + | |
1638 | + IP6_UPD_PO_STATS(dev_net(dev), idev, IPSTATS_MIB_OUTMCAST, | |
1639 | + skb->len); | |
1640 | + | |
1641 | + if (IPV6_ADDR_MC_SCOPE(&ipv6_hdr(skb)->daddr) <= | |
1642 | + IPV6_ADDR_SCOPE_NODELOCAL && | |
1643 | + !(dev->flags & IFF_LOOPBACK)) { | |
1644 | + kfree_skb(skb); | |
1645 | + return 0; | |
1646 | + } | |
1647 | + } | |
1648 | + | |
1649 | + rcu_read_lock_bh(); | |
1650 | + nexthop = rt6_nexthop((struct rt6_info *)dst); | |
1651 | + neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); | |
1652 | + if (unlikely(!neigh)) | |
1653 | + neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); | |
1654 | + if (!IS_ERR(neigh)) { | |
1655 | + ret = dst_neigh_output(dst, neigh, skb); | |
1656 | + rcu_read_unlock_bh(); | |
1657 | + return ret; | |
1658 | + } | |
1659 | + rcu_read_unlock_bh(); | |
1660 | + | |
1661 | + IP6_INC_STATS(dev_net(dst->dev), | |
1662 | + ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); | |
1663 | + kfree_skb(skb); | |
1664 | + return -EINVAL; | |
1665 | +} | |
1666 | + | |
1667 | +static int ip6_finish_output(struct sk_buff *skb) | |
1668 | +{ | |
1669 | + if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) || | |
1670 | + dst_allfrag(skb_dst(skb)) || | |
1671 | + (IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size)) | |
1672 | + return ip6_fragment(skb, ip6_finish_output2); | |
1673 | + else | |
1674 | + return ip6_finish_output2(skb); | |
1675 | +} | |
1676 | + | |
1677 | +int ip6_output(struct sk_buff *skb) | |
1678 | +{ | |
1679 | + struct net_device *dev = skb_dst(skb)->dev; | |
1680 | + struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); | |
1681 | + if (unlikely(idev->cnf.disable_ipv6)) { | |
1682 | + IP6_INC_STATS(dev_net(dev), idev, | |
1683 | + IPSTATS_MIB_OUTDISCARDS); | |
1684 | + kfree_skb(skb); | |
1685 | + return 0; | |
1686 | + } | |
1687 | + | |
1688 | + return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL, dev, | |
1689 | + ip6_finish_output, | |
1690 | + !(IP6CB(skb)->flags & IP6SKB_REROUTED)); | |
1691 | +} | |
1692 | + | |
1693 | +/* | |
1694 | + * xmit an sk_buff (used by TCP, SCTP and DCCP) | |
1695 | + */ | |
1696 | + | |
1697 | +int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, | |
1698 | + struct ipv6_txoptions *opt, int tclass) | |
1699 | +{ | |
1700 | + struct net *net = sock_net(sk); | |
1701 | + struct ipv6_pinfo *np = inet6_sk(sk); | |
1702 | + struct in6_addr *first_hop = &fl6->daddr; | |
1703 | + struct dst_entry *dst = skb_dst(skb); | |
1704 | + struct ipv6hdr *hdr; | |
1705 | + u8 proto = fl6->flowi6_proto; | |
1706 | + int seg_len = skb->len; | |
1707 | + int hlimit = -1; | |
1708 | + u32 mtu; | |
1709 | + | |
1710 | + if (opt) { | |
1711 | + unsigned int head_room; | |
1712 | + | |
1713 | + /* First: exthdrs may take lots of space (~8K for now) | |
1714 | + MAX_HEADER is not enough. | |
1715 | + */ | |
1716 | + head_room = opt->opt_nflen + opt->opt_flen; | |
1717 | + seg_len += head_room; | |
1718 | + head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); | |
1719 | + | |
1720 | + if (skb_headroom(skb) < head_room) { | |
1721 | + struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); | |
1722 | + if (skb2 == NULL) { | |
1723 | + IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), | |
1724 | + IPSTATS_MIB_OUTDISCARDS); | |
1725 | + kfree_skb(skb); | |
1726 | + return -ENOBUFS; | |
1727 | + } | |
1728 | + consume_skb(skb); | |
1729 | + skb = skb2; | |
1730 | + skb_set_owner_w(skb, sk); | |
1731 | + } | |
1732 | + if (opt->opt_flen) | |
1733 | + ipv6_push_frag_opts(skb, opt, &proto); | |
1734 | + if (opt->opt_nflen) | |
1735 | + ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop); | |
1736 | + } | |
1737 | + | |
1738 | + skb_push(skb, sizeof(struct ipv6hdr)); | |
1739 | + skb_reset_network_header(skb); | |
1740 | + hdr = ipv6_hdr(skb); | |
1741 | + | |
1742 | + /* | |
1743 | + * Fill in the IPv6 header | |
1744 | + */ | |
1745 | + if (np) | |
1746 | + hlimit = np->hop_limit; | |
1747 | + if (hlimit < 0) | |
1748 | + hlimit = ip6_dst_hoplimit(dst); | |
1749 | + | |
1750 | + ip6_flow_hdr(hdr, tclass, fl6->flowlabel); | |
1751 | + | |
1752 | + hdr->payload_len = htons(seg_len); | |
1753 | + hdr->nexthdr = proto; | |
1754 | + hdr->hop_limit = hlimit; | |
1755 | + | |
1756 | + hdr->saddr = fl6->saddr; | |
1757 | + hdr->daddr = *first_hop; | |
1758 | + | |
1759 | + skb->priority = sk->sk_priority; | |
1760 | + skb->mark = sk->sk_mark; | |
1761 | + | |
1762 | + mtu = dst_mtu(dst); | |
1763 | + if ((skb->len <= mtu) || skb->local_df || skb_is_gso(skb)) { | |
1764 | + IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)), | |
1765 | + IPSTATS_MIB_OUT, skb->len); | |
1766 | + return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, | |
1767 | + dst->dev, dst_output); | |
1768 | + } | |
1769 | + | |
1770 | + skb->dev = dst->dev; | |
1771 | + ipv6_local_error(sk, EMSGSIZE, fl6, mtu); | |
1772 | + IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS); | |
1773 | + kfree_skb(skb); | |
1774 | + return -EMSGSIZE; | |
1775 | +} | |
1776 | + | |
1777 | +EXPORT_SYMBOL(ip6_xmit); | |
1778 | + | |
1779 | +static int ip6_call_ra_chain(struct sk_buff *skb, int sel) | |
1780 | +{ | |
1781 | + struct ip6_ra_chain *ra; | |
1782 | + struct sock *last = NULL; | |
1783 | + | |
1784 | + read_lock(&ip6_ra_lock); | |
1785 | + for (ra = ip6_ra_chain; ra; ra = ra->next) { | |
1786 | + struct sock *sk = ra->sk; | |
1787 | + if (sk && ra->sel == sel && | |
1788 | + (!sk->sk_bound_dev_if || | |
1789 | + sk->sk_bound_dev_if == skb->dev->ifindex)) { | |
1790 | + if (last) { | |
1791 | + struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1792 | + if (skb2) | |
1793 | + rawv6_rcv(last, skb2); | |
1794 | + } | |
1795 | + last = sk; | |
1796 | + } | |
1797 | + } | |
1798 | + | |
1799 | + if (last) { | |
1800 | + rawv6_rcv(last, skb); | |
1801 | + read_unlock(&ip6_ra_lock); | |
1802 | + return 1; | |
1803 | + } | |
1804 | + read_unlock(&ip6_ra_lock); | |
1805 | + return 0; | |
1806 | +} | |
1807 | + | |
1808 | +static int ip6_forward_proxy_check(struct sk_buff *skb) | |
1809 | +{ | |
1810 | + struct ipv6hdr *hdr = ipv6_hdr(skb); | |
1811 | + u8 nexthdr = hdr->nexthdr; | |
1812 | + __be16 frag_off; | |
1813 | + int offset; | |
1814 | + | |
1815 | + if (ipv6_ext_hdr(nexthdr)) { | |
1816 | + offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr, &frag_off); | |
1817 | + if (offset < 0) | |
1818 | + return 0; | |
1819 | + } else | |
1820 | + offset = sizeof(struct ipv6hdr); | |
1821 | + | |
1822 | + if (nexthdr == IPPROTO_ICMPV6) { | |
1823 | + struct icmp6hdr *icmp6; | |
1824 | + | |
1825 | + if (!pskb_may_pull(skb, (skb_network_header(skb) + | |
1826 | + offset + 1 - skb->data))) | |
1827 | + return 0; | |
1828 | + | |
1829 | + icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset); | |
1830 | + | |
1831 | + switch (icmp6->icmp6_type) { | |
1832 | + case NDISC_ROUTER_SOLICITATION: | |
1833 | + case NDISC_ROUTER_ADVERTISEMENT: | |
1834 | + case NDISC_NEIGHBOUR_SOLICITATION: | |
1835 | + case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1836 | + case NDISC_REDIRECT: | |
1837 | + /* For reaction involving unicast neighbor discovery | |
1838 | + * message destined to the proxied address, pass it to | |
1839 | + * input function. | |
1840 | + */ | |
1841 | + return 1; | |
1842 | + default: | |
1843 | + break; | |
1844 | + } | |
1845 | + } | |
1846 | + | |
1847 | + /* | |
1848 | + * The proxying router can't forward traffic sent to a link-local | |
1849 | + * address, so signal the sender and discard the packet. This | |
1850 | + * behavior is clarified by the MIPv6 specification. | |
1851 | + */ | |
1852 | + if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) { | |
1853 | + dst_link_failure(skb); | |
1854 | + return -1; | |
1855 | + } | |
1856 | + | |
1857 | + return 0; | |
1858 | +} | |
1859 | + | |
1860 | +static inline int ip6_forward_finish(struct sk_buff *skb) | |
1861 | +{ | |
1862 | + return dst_output(skb); | |
1863 | +} | |
1864 | + | |
1865 | +int ip6_forward(struct sk_buff *skb) | |
1866 | +{ | |
1867 | + struct dst_entry *dst = skb_dst(skb); | |
1868 | + struct ipv6hdr *hdr = ipv6_hdr(skb); | |
1869 | + struct inet6_skb_parm *opt = IP6CB(skb); | |
1870 | + struct net *net = dev_net(dst->dev); | |
1871 | + u32 mtu; | |
1872 | + | |
1873 | + if (net->ipv6.devconf_all->forwarding == 0) | |
1874 | + goto error; | |
1875 | + | |
1876 | + if (skb_warn_if_lro(skb)) | |
1877 | + goto drop; | |
1878 | + | |
1879 | + if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { | |
1880 | + IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); | |
1881 | + goto drop; | |
1882 | + } | |
1883 | + | |
1884 | + if (skb->pkt_type != PACKET_HOST) | |
1885 | + goto drop; | |
1886 | + | |
1887 | + skb_forward_csum(skb); | |
1888 | + | |
1889 | + /* | |
1890 | + * We DO NOT make any processing on | |
1891 | + * RA packets, pushing them to user level AS IS | |
1892 | + * without ane WARRANTY that application will be able | |
1893 | + * to interpret them. The reason is that we | |
1894 | + * cannot make anything clever here. | |
1895 | + * | |
1896 | + * We are not end-node, so that if packet contains | |
1897 | + * AH/ESP, we cannot make anything. | |
1898 | + * Defragmentation also would be mistake, RA packets | |
1899 | + * cannot be fragmented, because there is no warranty | |
1900 | + * that different fragments will go along one path. --ANK | |
1901 | + */ | |
1902 | + if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) { | |
1903 | + if (ip6_call_ra_chain(skb, ntohs(opt->ra))) | |
1904 | + return 0; | |
1905 | + } | |
1906 | + | |
1907 | + /* | |
1908 | + * check and decrement ttl | |
1909 | + */ | |
1910 | + if (hdr->hop_limit <= 1) { | |
1911 | + /* Force OUTPUT device used as source address */ | |
1912 | + skb->dev = dst->dev; | |
1913 | + icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0); | |
1914 | + IP6_INC_STATS_BH(net, | |
1915 | + ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); | |
1916 | + | |
1917 | + kfree_skb(skb); | |
1918 | + return -ETIMEDOUT; | |
1919 | + } | |
1920 | + | |
1921 | + /* XXX: idev->cnf.proxy_ndp? */ | |
1922 | + if (net->ipv6.devconf_all->proxy_ndp && | |
1923 | + pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) { | |
1924 | + int proxied = ip6_forward_proxy_check(skb); | |
1925 | + if (proxied > 0) | |
1926 | + return ip6_input(skb); | |
1927 | + else if (proxied < 0) { | |
1928 | + IP6_INC_STATS(net, ip6_dst_idev(dst), | |
1929 | + IPSTATS_MIB_INDISCARDS); | |
1930 | + goto drop; | |
1931 | + } | |
1932 | + } | |
1933 | + | |
1934 | + if (!xfrm6_route_forward(skb)) { | |
1935 | + IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); | |
1936 | + goto drop; | |
1937 | + } | |
1938 | + dst = skb_dst(skb); | |
1939 | + | |
1940 | + /* IPv6 specs say nothing about it, but it is clear that we cannot | |
1941 | + send redirects to source routed frames. | |
1942 | + We don't send redirects to frames decapsulated from IPsec. | |
1943 | + */ | |
1944 | + if (skb->dev == dst->dev && opt->srcrt == 0 && !skb_sec_path(skb)) { | |
1945 | + struct in6_addr *target = NULL; | |
1946 | + struct inet_peer *peer; | |
1947 | + struct rt6_info *rt; | |
1948 | + | |
1949 | + /* | |
1950 | + * incoming and outgoing devices are the same | |
1951 | + * send a redirect. | |
1952 | + */ | |
1953 | + | |
1954 | + rt = (struct rt6_info *) dst; | |
1955 | + if (rt->rt6i_flags & RTF_GATEWAY) | |
1956 | + target = &rt->rt6i_gateway; | |
1957 | + else | |
1958 | + target = &hdr->daddr; | |
1959 | + | |
1960 | + peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); | |
1961 | + | |
1962 | + /* Limit redirects both by destination (here) | |
1963 | + and by source (inside ndisc_send_redirect) | |
1964 | + */ | |
1965 | + if (inet_peer_xrlim_allow(peer, 1*HZ)) | |
1966 | + ndisc_send_redirect(skb, target); | |
1967 | + if (peer) | |
1968 | + inet_putpeer(peer); | |
1969 | + } else { | |
1970 | + int addrtype = ipv6_addr_type(&hdr->saddr); | |
1971 | + | |
1972 | + /* This check is security critical. */ | |
1973 | + if (addrtype == IPV6_ADDR_ANY || | |
1974 | + addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK)) | |
1975 | + goto error; | |
1976 | + if (addrtype & IPV6_ADDR_LINKLOCAL) { | |
1977 | + icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
1978 | + ICMPV6_NOT_NEIGHBOUR, 0); | |
1979 | + goto error; | |
1980 | + } | |
1981 | + } | |
1982 | + | |
1983 | + mtu = dst_mtu(dst); | |
1984 | + if (mtu < IPV6_MIN_MTU) | |
1985 | + mtu = IPV6_MIN_MTU; | |
1986 | + | |
1987 | + if ((!skb->local_df && skb->len > mtu && !skb_is_gso(skb)) || | |
1988 | + (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu)) { | |
1989 | + /* Again, force OUTPUT device used as source address */ | |
1990 | + skb->dev = dst->dev; | |
1991 | + icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
1992 | + IP6_INC_STATS_BH(net, | |
1993 | + ip6_dst_idev(dst), IPSTATS_MIB_INTOOBIGERRORS); | |
1994 | + IP6_INC_STATS_BH(net, | |
1995 | + ip6_dst_idev(dst), IPSTATS_MIB_FRAGFAILS); | |
1996 | + kfree_skb(skb); | |
1997 | + return -EMSGSIZE; | |
1998 | + } | |
1999 | + | |
2000 | + if (skb_cow(skb, dst->dev->hard_header_len)) { | |
2001 | + IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS); | |
2002 | + goto drop; | |
2003 | + } | |
2004 | + | |
2005 | + hdr = ipv6_hdr(skb); | |
2006 | + | |
2007 | + /* Mangling hops number delayed to point after skb COW */ | |
2008 | + | |
2009 | + hdr->hop_limit--; | |
2010 | + | |
2011 | + IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS); | |
2012 | + IP6_ADD_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTOCTETS, skb->len); | |
2013 | + return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dst->dev, | |
2014 | + ip6_forward_finish); | |
2015 | + | |
2016 | +error: | |
2017 | + IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS); | |
2018 | +drop: | |
2019 | + kfree_skb(skb); | |
2020 | + return -EINVAL; | |
2021 | +} | |
2022 | + | |
2023 | +static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) | |
2024 | +{ | |
2025 | + to->pkt_type = from->pkt_type; | |
2026 | + to->priority = from->priority; | |
2027 | + to->protocol = from->protocol; | |
2028 | + skb_dst_drop(to); | |
2029 | + skb_dst_set(to, dst_clone(skb_dst(from))); | |
2030 | + to->dev = from->dev; | |
2031 | + to->mark = from->mark; | |
2032 | + | |
2033 | +#ifdef CONFIG_NET_SCHED | |
2034 | + to->tc_index = from->tc_index; | |
2035 | +#endif | |
2036 | + nf_copy(to, from); | |
2037 | +#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) | |
2038 | + to->nf_trace = from->nf_trace; | |
2039 | +#endif | |
2040 | + skb_copy_secmark(to, from); | |
2041 | +} | |
2042 | + | |
2043 | +int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) | |
2044 | +{ | |
2045 | + struct sk_buff *frag; | |
2046 | + struct rt6_info *rt = (struct rt6_info*)skb_dst(skb); | |
2047 | + struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; | |
2048 | + struct ipv6hdr *tmp_hdr; | |
2049 | + struct frag_hdr *fh; | |
2050 | + unsigned int mtu, hlen, left, len; | |
2051 | + int hroom, troom; | |
2052 | + __be32 frag_id = 0; | |
2053 | + int ptr, offset = 0, err=0; | |
2054 | + u8 *prevhdr, nexthdr = 0; | |
2055 | + struct net *net = dev_net(skb_dst(skb)->dev); | |
2056 | + | |
2057 | + hlen = ip6_find_1stfragopt(skb, &prevhdr); | |
2058 | + nexthdr = *prevhdr; | |
2059 | + | |
2060 | + mtu = ip6_skb_dst_mtu(skb); | |
2061 | + | |
2062 | + /* We must not fragment if the socket is set to force MTU discovery | |
2063 | + * or if the skb it not generated by a local socket. | |
2064 | + */ | |
2065 | + if (unlikely(!skb->local_df && skb->len > mtu) || | |
2066 | + (IP6CB(skb)->frag_max_size && | |
2067 | + IP6CB(skb)->frag_max_size > mtu)) { | |
2068 | + if (skb->sk && dst_allfrag(skb_dst(skb))) | |
2069 | + sk_nocaps_add(skb->sk, NETIF_F_GSO_MASK); | |
2070 | + | |
2071 | + skb->dev = skb_dst(skb)->dev; | |
2072 | + icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
2073 | + IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), | |
2074 | + IPSTATS_MIB_FRAGFAILS); | |
2075 | + kfree_skb(skb); | |
2076 | + return -EMSGSIZE; | |
2077 | + } | |
2078 | + | |
2079 | + if (np && np->frag_size < mtu) { | |
2080 | + if (np->frag_size) | |
2081 | + mtu = np->frag_size; | |
2082 | + } | |
2083 | + mtu -= hlen + sizeof(struct frag_hdr); | |
2084 | + | |
2085 | + if (skb_has_frag_list(skb)) { | |
2086 | + int first_len = skb_pagelen(skb); | |
2087 | + struct sk_buff *frag2; | |
2088 | + | |
2089 | + if (first_len - hlen > mtu || | |
2090 | + ((first_len - hlen) & 7) || | |
2091 | + skb_cloned(skb)) | |
2092 | + goto slow_path; | |
2093 | + | |
2094 | + skb_walk_frags(skb, frag) { | |
2095 | + /* Correct geometry. */ | |
2096 | + if (frag->len > mtu || | |
2097 | + ((frag->len & 7) && frag->next) || | |
2098 | + skb_headroom(frag) < hlen) | |
2099 | + goto slow_path_clean; | |
2100 | + | |
2101 | + /* Partially cloned skb? */ | |
2102 | + if (skb_shared(frag)) | |
2103 | + goto slow_path_clean; | |
2104 | + | |
2105 | + BUG_ON(frag->sk); | |
2106 | + if (skb->sk) { | |
2107 | + frag->sk = skb->sk; | |
2108 | + frag->destructor = sock_wfree; | |
2109 | + } | |
2110 | + skb->truesize -= frag->truesize; | |
2111 | + } | |
2112 | + | |
2113 | + err = 0; | |
2114 | + offset = 0; | |
2115 | + frag = skb_shinfo(skb)->frag_list; | |
2116 | + skb_frag_list_init(skb); | |
2117 | + /* BUILD HEADER */ | |
2118 | + | |
2119 | + *prevhdr = NEXTHDR_FRAGMENT; | |
2120 | + tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC); | |
2121 | + if (!tmp_hdr) { | |
2122 | + IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), | |
2123 | + IPSTATS_MIB_FRAGFAILS); | |
2124 | + return -ENOMEM; | |
2125 | + } | |
2126 | + | |
2127 | + __skb_pull(skb, hlen); | |
2128 | + fh = (struct frag_hdr*)__skb_push(skb, sizeof(struct frag_hdr)); | |
2129 | + __skb_push(skb, hlen); | |
2130 | + skb_reset_network_header(skb); | |
2131 | + memcpy(skb_network_header(skb), tmp_hdr, hlen); | |
2132 | + | |
2133 | + ipv6_select_ident(fh, rt); | |
2134 | + fh->nexthdr = nexthdr; | |
2135 | + fh->reserved = 0; | |
2136 | + fh->frag_off = htons(IP6_MF); | |
2137 | + frag_id = fh->identification; | |
2138 | + | |
2139 | + first_len = skb_pagelen(skb); | |
2140 | + skb->data_len = first_len - skb_headlen(skb); | |
2141 | + skb->len = first_len; | |
2142 | + ipv6_hdr(skb)->payload_len = htons(first_len - | |
2143 | + sizeof(struct ipv6hdr)); | |
2144 | + | |
2145 | + dst_hold(&rt->dst); | |
2146 | + | |
2147 | + for (;;) { | |
2148 | + /* Prepare header of the next frame, | |
2149 | + * before previous one went down. */ | |
2150 | + if (frag) { | |
2151 | + frag->ip_summed = CHECKSUM_NONE; | |
2152 | + skb_reset_transport_header(frag); | |
2153 | + fh = (struct frag_hdr*)__skb_push(frag, sizeof(struct frag_hdr)); | |
2154 | + __skb_push(frag, hlen); | |
2155 | + skb_reset_network_header(frag); | |
2156 | + memcpy(skb_network_header(frag), tmp_hdr, | |
2157 | + hlen); | |
2158 | + offset += skb->len - hlen - sizeof(struct frag_hdr); | |
2159 | + fh->nexthdr = nexthdr; | |
2160 | + fh->reserved = 0; | |
2161 | + fh->frag_off = htons(offset); | |
2162 | + if (frag->next != NULL) | |
2163 | + fh->frag_off |= htons(IP6_MF); | |
2164 | + fh->identification = frag_id; | |
2165 | + ipv6_hdr(frag)->payload_len = | |
2166 | + htons(frag->len - | |
2167 | + sizeof(struct ipv6hdr)); | |
2168 | + ip6_copy_metadata(frag, skb); | |
2169 | + } | |
2170 | + | |
2171 | + err = output(skb); | |
2172 | + if(!err) | |
2173 | + IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), | |
2174 | + IPSTATS_MIB_FRAGCREATES); | |
2175 | + | |
2176 | + if (err || !frag) | |
2177 | + break; | |
2178 | + | |
2179 | + skb = frag; | |
2180 | + frag = skb->next; | |
2181 | + skb->next = NULL; | |
2182 | + } | |
2183 | + | |
2184 | + kfree(tmp_hdr); | |
2185 | + | |
2186 | + if (err == 0) { | |
2187 | + IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), | |
2188 | + IPSTATS_MIB_FRAGOKS); | |
2189 | + ip6_rt_put(rt); | |
2190 | + return 0; | |
2191 | + } | |
2192 | + | |
2193 | + while (frag) { | |
2194 | + skb = frag->next; | |
2195 | + kfree_skb(frag); | |
2196 | + frag = skb; | |
2197 | + } | |
2198 | + | |
2199 | + IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), | |
2200 | + IPSTATS_MIB_FRAGFAILS); | |
2201 | + ip6_rt_put(rt); | |
2202 | + return err; | |
2203 | + | |
2204 | +slow_path_clean: | |
2205 | + skb_walk_frags(skb, frag2) { | |
2206 | + if (frag2 == frag) | |
2207 | + break; | |
2208 | + frag2->sk = NULL; | |
2209 | + frag2->destructor = NULL; | |
2210 | + skb->truesize += frag2->truesize; | |
2211 | + } | |
2212 | + } | |
2213 | + | |
2214 | +slow_path: | |
2215 | + if ((skb->ip_summed == CHECKSUM_PARTIAL) && | |
2216 | + skb_checksum_help(skb)) | |
2217 | + goto fail; | |
2218 | + | |
2219 | + left = skb->len - hlen; /* Space per frame */ | |
2220 | + ptr = hlen; /* Where to start from */ | |
2221 | + | |
2222 | + /* | |
2223 | + * Fragment the datagram. | |
2224 | + */ | |
2225 | + | |
2226 | + *prevhdr = NEXTHDR_FRAGMENT; | |
2227 | + hroom = LL_RESERVED_SPACE(rt->dst.dev); | |
2228 | + troom = rt->dst.dev->needed_tailroom; | |
2229 | + | |
2230 | + /* | |
2231 | + * Keep copying data until we run out. | |
2232 | + */ | |
2233 | + while(left > 0) { | |
2234 | + len = left; | |
2235 | + /* IF: it doesn't fit, use 'mtu' - the data space left */ | |
2236 | + if (len > mtu) | |
2237 | + len = mtu; | |
2238 | + /* IF: we are not sending up to and including the packet end | |
2239 | + then align the next start on an eight byte boundary */ | |
2240 | + if (len < left) { | |
2241 | + len &= ~7; | |
2242 | + } | |
2243 | + /* | |
2244 | + * Allocate buffer. | |
2245 | + */ | |
2246 | + | |
2247 | + if ((frag = alloc_skb(len + hlen + sizeof(struct frag_hdr) + | |
2248 | + hroom + troom, GFP_ATOMIC)) == NULL) { | |
2249 | + NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n"); | |
2250 | + IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), | |
2251 | + IPSTATS_MIB_FRAGFAILS); | |
2252 | + err = -ENOMEM; | |
2253 | + goto fail; | |
2254 | + } | |
2255 | + | |
2256 | + /* | |
2257 | + * Set up data on packet | |
2258 | + */ | |
2259 | + | |
2260 | + ip6_copy_metadata(frag, skb); | |
2261 | + skb_reserve(frag, hroom); | |
2262 | + skb_put(frag, len + hlen + sizeof(struct frag_hdr)); | |
2263 | + skb_reset_network_header(frag); | |
2264 | + fh = (struct frag_hdr *)(skb_network_header(frag) + hlen); | |
2265 | + frag->transport_header = (frag->network_header + hlen + | |
2266 | + sizeof(struct frag_hdr)); | |
2267 | + | |
2268 | + /* | |
2269 | + * Charge the memory for the fragment to any owner | |
2270 | + * it might possess | |
2271 | + */ | |
2272 | + if (skb->sk) | |
2273 | + skb_set_owner_w(frag, skb->sk); | |
2274 | + | |
2275 | + /* | |
2276 | + * Copy the packet header into the new buffer. | |
2277 | + */ | |
2278 | + skb_copy_from_linear_data(skb, skb_network_header(frag), hlen); | |
2279 | + | |
2280 | + /* | |
2281 | + * Build fragment header. | |
2282 | + */ | |
2283 | + fh->nexthdr = nexthdr; | |
2284 | + fh->reserved = 0; | |
2285 | + if (!frag_id) { | |
2286 | + ipv6_select_ident(fh, rt); | |
2287 | + frag_id = fh->identification; | |
2288 | + } else | |
2289 | + fh->identification = frag_id; | |
2290 | + | |
2291 | + /* | |
2292 | + * Copy a block of the IP datagram. | |
2293 | + */ | |
2294 | + if (skb_copy_bits(skb, ptr, skb_transport_header(frag), len)) | |
2295 | + BUG(); | |
2296 | + left -= len; | |
2297 | + | |
2298 | + fh->frag_off = htons(offset); | |
2299 | + if (left > 0) | |
2300 | + fh->frag_off |= htons(IP6_MF); | |
2301 | + ipv6_hdr(frag)->payload_len = htons(frag->len - | |
2302 | + sizeof(struct ipv6hdr)); | |
2303 | + | |
2304 | + ptr += len; | |
2305 | + offset += len; | |
2306 | + | |
2307 | + /* | |
2308 | + * Put this fragment into the sending queue. | |
2309 | + */ | |
2310 | + err = output(frag); | |
2311 | + if (err) | |
2312 | + goto fail; | |
2313 | + | |
2314 | + IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), | |
2315 | + IPSTATS_MIB_FRAGCREATES); | |
2316 | + } | |
2317 | + IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), | |
2318 | + IPSTATS_MIB_FRAGOKS); | |
2319 | + consume_skb(skb); | |
2320 | + return err; | |
2321 | + | |
2322 | +fail: | |
2323 | + IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), | |
2324 | + IPSTATS_MIB_FRAGFAILS); | |
2325 | + kfree_skb(skb); | |
2326 | + return err; | |
2327 | +} | |
2328 | + | |
2329 | +static inline int ip6_rt_check(const struct rt6key *rt_key, | |
2330 | + const struct in6_addr *fl_addr, | |
2331 | + const struct in6_addr *addr_cache) | |
2332 | +{ | |
2333 | + return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) && | |
2334 | + (addr_cache == NULL || !ipv6_addr_equal(fl_addr, addr_cache)); | |
2335 | +} | |
2336 | + | |
2337 | +static struct dst_entry *ip6_sk_dst_check(struct sock *sk, | |
2338 | + struct dst_entry *dst, | |
2339 | + const struct flowi6 *fl6) | |
2340 | +{ | |
2341 | + struct ipv6_pinfo *np = inet6_sk(sk); | |
2342 | + struct rt6_info *rt; | |
2343 | + | |
2344 | + if (!dst) | |
2345 | + goto out; | |
2346 | + | |
2347 | + if (dst->ops->family != AF_INET6) { | |
2348 | + dst_release(dst); | |
2349 | + return NULL; | |
2350 | + } | |
2351 | + | |
2352 | + rt = (struct rt6_info *)dst; | |
2353 | + /* Yes, checking route validity in not connected | |
2354 | + * case is not very simple. Take into account, | |
2355 | + * that we do not support routing by source, TOS, | |
2356 | + * and MSG_DONTROUTE --ANK (980726) | |
2357 | + * | |
2358 | + * 1. ip6_rt_check(): If route was host route, | |
2359 | + * check that cached destination is current. | |
2360 | + * If it is network route, we still may | |
2361 | + * check its validity using saved pointer | |
2362 | + * to the last used address: daddr_cache. | |
2363 | + * We do not want to save whole address now, | |
2364 | + * (because main consumer of this service | |
2365 | + * is tcp, which has not this problem), | |
2366 | + * so that the last trick works only on connected | |
2367 | + * sockets. | |
2368 | + * 2. oif also should be the same. | |
2369 | + */ | |
2370 | + if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) || | |
2371 | +#ifdef CONFIG_IPV6_SUBTREES | |
2372 | + ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) || | |
2373 | +#endif | |
2374 | + (fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex)) { | |
2375 | + dst_release(dst); | |
2376 | + dst = NULL; | |
2377 | + } | |
2378 | + | |
2379 | +out: | |
2380 | + return dst; | |
2381 | +} | |
2382 | + | |
2383 | +static int ip6_dst_lookup_tail(struct sock *sk, | |
2384 | + struct dst_entry **dst, struct flowi6 *fl6) | |
2385 | +{ | |
2386 | + struct net *net = sock_net(sk); | |
2387 | +#ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
2388 | + struct neighbour *n; | |
2389 | + struct rt6_info *rt; | |
2390 | +#endif | |
2391 | + int err; | |
2392 | + | |
2393 | + if (*dst == NULL) | |
2394 | + *dst = ip6_route_output(net, sk, fl6); | |
2395 | + | |
2396 | + if ((err = (*dst)->error)) | |
2397 | + goto out_err_release; | |
2398 | + | |
2399 | + if (ipv6_addr_any(&fl6->saddr)) { | |
2400 | + struct rt6_info *rt = (struct rt6_info *) *dst; | |
2401 | + err = ip6_route_get_saddr(net, rt, &fl6->daddr, | |
2402 | + sk ? inet6_sk(sk)->srcprefs : 0, | |
2403 | + &fl6->saddr); | |
2404 | + if (err) | |
2405 | + goto out_err_release; | |
2406 | + } | |
2407 | + | |
2408 | +#ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
2409 | + /* | |
2410 | + * Here if the dst entry we've looked up | |
2411 | + * has a neighbour entry that is in the INCOMPLETE | |
2412 | + * state and the src address from the flow is | |
2413 | + * marked as OPTIMISTIC, we release the found | |
2414 | + * dst entry and replace it instead with the | |
2415 | + * dst entry of the nexthop router | |
2416 | + */ | |
2417 | + rt = (struct rt6_info *) *dst; | |
2418 | + rcu_read_lock_bh(); | |
2419 | + n = __ipv6_neigh_lookup_noref(rt->dst.dev, rt6_nexthop(rt)); | |
2420 | + err = n && !(n->nud_state & NUD_VALID) ? -EINVAL : 0; | |
2421 | + rcu_read_unlock_bh(); | |
2422 | + | |
2423 | + if (err) { | |
2424 | + struct inet6_ifaddr *ifp; | |
2425 | + struct flowi6 fl_gw6; | |
2426 | + int redirect; | |
2427 | + | |
2428 | + ifp = ipv6_get_ifaddr(net, &fl6->saddr, | |
2429 | + (*dst)->dev, 1); | |
2430 | + | |
2431 | + redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC); | |
2432 | + if (ifp) | |
2433 | + in6_ifa_put(ifp); | |
2434 | + | |
2435 | + if (redirect) { | |
2436 | + /* | |
2437 | + * We need to get the dst entry for the | |
2438 | + * default router instead | |
2439 | + */ | |
2440 | + dst_release(*dst); | |
2441 | + memcpy(&fl_gw6, fl6, sizeof(struct flowi6)); | |
2442 | + memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr)); | |
2443 | + *dst = ip6_route_output(net, sk, &fl_gw6); | |
2444 | + if ((err = (*dst)->error)) | |
2445 | + goto out_err_release; | |
2446 | + } | |
2447 | + } | |
2448 | +#endif | |
2449 | + | |
2450 | + return 0; | |
2451 | + | |
2452 | +out_err_release: | |
2453 | + if (err == -ENETUNREACH) | |
2454 | + IP6_INC_STATS_BH(net, NULL, IPSTATS_MIB_OUTNOROUTES); | |
2455 | + dst_release(*dst); | |
2456 | + *dst = NULL; | |
2457 | + return err; | |
2458 | +} | |
2459 | + | |
2460 | +/** | |
2461 | + * ip6_dst_lookup - perform route lookup on flow | |
2462 | + * @sk: socket which provides route info | |
2463 | + * @dst: pointer to dst_entry * for result | |
2464 | + * @fl6: flow to lookup | |
2465 | + * | |
2466 | + * This function performs a route lookup on the given flow. | |
2467 | + * | |
2468 | + * It returns zero on success, or a standard errno code on error. | |
2469 | + */ | |
2470 | +int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6) | |
2471 | +{ | |
2472 | + *dst = NULL; | |
2473 | + return ip6_dst_lookup_tail(sk, dst, fl6); | |
2474 | +} | |
2475 | +EXPORT_SYMBOL_GPL(ip6_dst_lookup); | |
2476 | + | |
2477 | +/** | |
2478 | + * ip6_dst_lookup_flow - perform route lookup on flow with ipsec | |
2479 | + * @sk: socket which provides route info | |
2480 | + * @fl6: flow to lookup | |
2481 | + * @final_dst: final destination address for ipsec lookup | |
2482 | + * @can_sleep: we are in a sleepable context | |
2483 | + * | |
2484 | + * This function performs a route lookup on the given flow. | |
2485 | + * | |
2486 | + * It returns a valid dst pointer on success, or a pointer encoded | |
2487 | + * error code. | |
2488 | + */ | |
2489 | +struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, | |
2490 | + const struct in6_addr *final_dst, | |
2491 | + bool can_sleep) | |
2492 | +{ | |
2493 | + struct dst_entry *dst = NULL; | |
2494 | + int err; | |
2495 | + | |
2496 | + err = ip6_dst_lookup_tail(sk, &dst, fl6); | |
2497 | + if (err) | |
2498 | + return ERR_PTR(err); | |
2499 | + if (final_dst) | |
2500 | + fl6->daddr = *final_dst; | |
2501 | + if (can_sleep) | |
2502 | + fl6->flowi6_flags |= FLOWI_FLAG_CAN_SLEEP; | |
2503 | + | |
2504 | + return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0); | |
2505 | +} | |
2506 | +EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow); | |
2507 | + | |
2508 | +/** | |
2509 | + * ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow | |
2510 | + * @sk: socket which provides the dst cache and route info | |
2511 | + * @fl6: flow to lookup | |
2512 | + * @final_dst: final destination address for ipsec lookup | |
2513 | + * @can_sleep: we are in a sleepable context | |
2514 | + * | |
2515 | + * This function performs a route lookup on the given flow with the | |
2516 | + * possibility of using the cached route in the socket if it is valid. | |
2517 | + * It will take the socket dst lock when operating on the dst cache. | |
2518 | + * As a result, this function can only be used in process context. | |
2519 | + * | |
2520 | + * It returns a valid dst pointer on success, or a pointer encoded | |
2521 | + * error code. | |
2522 | + */ | |
2523 | +struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, | |
2524 | + const struct in6_addr *final_dst, | |
2525 | + bool can_sleep) | |
2526 | +{ | |
2527 | + struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie); | |
2528 | + int err; | |
2529 | + | |
2530 | + dst = ip6_sk_dst_check(sk, dst, fl6); | |
2531 | + | |
2532 | + err = ip6_dst_lookup_tail(sk, &dst, fl6); | |
2533 | + if (err) | |
2534 | + return ERR_PTR(err); | |
2535 | + if (final_dst) | |
2536 | + fl6->daddr = *final_dst; | |
2537 | + if (can_sleep) | |
2538 | + fl6->flowi6_flags |= FLOWI_FLAG_CAN_SLEEP; | |
2539 | + | |
2540 | + return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0); | |
2541 | +} | |
2542 | +EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow); | |
2543 | + | |
2544 | +static inline int ip6_ufo_append_data(struct sock *sk, | |
2545 | + int getfrag(void *from, char *to, int offset, int len, | |
2546 | + int odd, struct sk_buff *skb), | |
2547 | + void *from, int length, int hh_len, int fragheaderlen, | |
2548 | + int transhdrlen, int mtu,unsigned int flags, | |
2549 | + struct rt6_info *rt) | |
2550 | + | |
2551 | +{ | |
2552 | + struct sk_buff *skb; | |
2553 | + int err; | |
2554 | + | |
2555 | + /* There is support for UDP large send offload by network | |
2556 | + * device, so create one single skb packet containing complete | |
2557 | + * udp datagram | |
2558 | + */ | |
2559 | + if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) { | |
2560 | + struct frag_hdr fhdr; | |
2561 | + | |
2562 | + skb = sock_alloc_send_skb(sk, | |
2563 | + hh_len + fragheaderlen + transhdrlen + 20, | |
2564 | + (flags & MSG_DONTWAIT), &err); | |
2565 | + if (skb == NULL) | |
2566 | + return err; | |
2567 | + | |
2568 | + /* reserve space for Hardware header */ | |
2569 | + skb_reserve(skb, hh_len); | |
2570 | + | |
2571 | + /* create space for UDP/IP header */ | |
2572 | + skb_put(skb,fragheaderlen + transhdrlen); | |
2573 | + | |
2574 | + /* initialize network header pointer */ | |
2575 | + skb_reset_network_header(skb); | |
2576 | + | |
2577 | + /* initialize protocol header pointer */ | |
2578 | + skb->transport_header = skb->network_header + fragheaderlen; | |
2579 | + | |
2580 | + skb->ip_summed = CHECKSUM_PARTIAL; | |
2581 | + skb->csum = 0; | |
2582 | + | |
2583 | + /* Specify the length of each IPv6 datagram fragment. | |
2584 | + * It has to be a multiple of 8. | |
2585 | + */ | |
2586 | + skb_shinfo(skb)->gso_size = (mtu - fragheaderlen - | |
2587 | + sizeof(struct frag_hdr)) & ~7; | |
2588 | + skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
2589 | + ipv6_select_ident(&fhdr, rt); | |
2590 | + skb_shinfo(skb)->ip6_frag_id = fhdr.identification; | |
2591 | + __skb_queue_tail(&sk->sk_write_queue, skb); | |
2592 | + } | |
2593 | + | |
2594 | + return skb_append_datato_frags(sk, skb, getfrag, from, | |
2595 | + (length - transhdrlen)); | |
2596 | +} | |
2597 | + | |
2598 | +static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src, | |
2599 | + gfp_t gfp) | |
2600 | +{ | |
2601 | + return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
2602 | +} | |
2603 | + | |
2604 | +static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src, | |
2605 | + gfp_t gfp) | |
2606 | +{ | |
2607 | + return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; | |
2608 | +} | |
2609 | + | |
2610 | +static void ip6_append_data_mtu(unsigned int *mtu, | |
2611 | + int *maxfraglen, | |
2612 | + unsigned int fragheaderlen, | |
2613 | + struct sk_buff *skb, | |
2614 | + struct rt6_info *rt, | |
2615 | + bool pmtuprobe) | |
2616 | +{ | |
2617 | + if (!(rt->dst.flags & DST_XFRM_TUNNEL)) { | |
2618 | + if (skb == NULL) { | |
2619 | + /* first fragment, reserve header_len */ | |
2620 | + *mtu = *mtu - rt->dst.header_len; | |
2621 | + | |
2622 | + } else { | |
2623 | + /* | |
2624 | + * this fragment is not first, the headers | |
2625 | + * space is regarded as data space. | |
2626 | + */ | |
2627 | + *mtu = min(*mtu, pmtuprobe ? | |
2628 | + rt->dst.dev->mtu : | |
2629 | + dst_mtu(rt->dst.path)); | |
2630 | + } | |
2631 | + *maxfraglen = ((*mtu - fragheaderlen) & ~7) | |
2632 | + + fragheaderlen - sizeof(struct frag_hdr); | |
2633 | + } | |
2634 | +} | |
2635 | + | |
2636 | +int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, | |
2637 | + int offset, int len, int odd, struct sk_buff *skb), | |
2638 | + void *from, int length, int transhdrlen, | |
2639 | + int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, | |
2640 | + struct rt6_info *rt, unsigned int flags, int dontfrag) | |
2641 | +{ | |
2642 | + struct inet_sock *inet = inet_sk(sk); | |
2643 | + struct ipv6_pinfo *np = inet6_sk(sk); | |
2644 | + struct inet_cork *cork; | |
2645 | + struct sk_buff *skb, *skb_prev = NULL; | |
2646 | + unsigned int maxfraglen, fragheaderlen, mtu; | |
2647 | + int exthdrlen; | |
2648 | + int dst_exthdrlen; | |
2649 | + int hh_len; | |
2650 | + int copy; | |
2651 | + int err; | |
2652 | + int offset = 0; | |
2653 | + __u8 tx_flags = 0; | |
2654 | + | |
2655 | + if (flags&MSG_PROBE) | |
2656 | + return 0; | |
2657 | + cork = &inet->cork.base; | |
2658 | + if (skb_queue_empty(&sk->sk_write_queue)) { | |
2659 | + /* | |
2660 | + * setup for corking | |
2661 | + */ | |
2662 | + if (opt) { | |
2663 | + if (WARN_ON(np->cork.opt)) | |
2664 | + return -EINVAL; | |
2665 | + | |
2666 | + np->cork.opt = kzalloc(opt->tot_len, sk->sk_allocation); | |
2667 | + if (unlikely(np->cork.opt == NULL)) | |
2668 | + return -ENOBUFS; | |
2669 | + | |
2670 | + np->cork.opt->tot_len = opt->tot_len; | |
2671 | + np->cork.opt->opt_flen = opt->opt_flen; | |
2672 | + np->cork.opt->opt_nflen = opt->opt_nflen; | |
2673 | + | |
2674 | + np->cork.opt->dst0opt = ip6_opt_dup(opt->dst0opt, | |
2675 | + sk->sk_allocation); | |
2676 | + if (opt->dst0opt && !np->cork.opt->dst0opt) | |
2677 | + return -ENOBUFS; | |
2678 | + | |
2679 | + np->cork.opt->dst1opt = ip6_opt_dup(opt->dst1opt, | |
2680 | + sk->sk_allocation); | |
2681 | + if (opt->dst1opt && !np->cork.opt->dst1opt) | |
2682 | + return -ENOBUFS; | |
2683 | + | |
2684 | + np->cork.opt->hopopt = ip6_opt_dup(opt->hopopt, | |
2685 | + sk->sk_allocation); | |
2686 | + if (opt->hopopt && !np->cork.opt->hopopt) | |
2687 | + return -ENOBUFS; | |
2688 | + | |
2689 | + np->cork.opt->srcrt = ip6_rthdr_dup(opt->srcrt, | |
2690 | + sk->sk_allocation); | |
2691 | + if (opt->srcrt && !np->cork.opt->srcrt) | |
2692 | + return -ENOBUFS; | |
2693 | + | |
2694 | + /* need source address above miyazawa*/ | |
2695 | + } | |
2696 | + dst_hold(&rt->dst); | |
2697 | + cork->dst = &rt->dst; | |
2698 | + inet->cork.fl.u.ip6 = *fl6; | |
2699 | + np->cork.hop_limit = hlimit; | |
2700 | + np->cork.tclass = tclass; | |
2701 | + if (rt->dst.flags & DST_XFRM_TUNNEL) | |
2702 | + mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ? | |
2703 | + rt->dst.dev->mtu : dst_mtu(&rt->dst); | |
2704 | + else | |
2705 | + mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ? | |
2706 | + rt->dst.dev->mtu : dst_mtu(rt->dst.path); | |
2707 | + if (np->frag_size < mtu) { | |
2708 | + if (np->frag_size) | |
2709 | + mtu = np->frag_size; | |
2710 | + } | |
2711 | + cork->fragsize = mtu; | |
2712 | + if (dst_allfrag(rt->dst.path)) | |
2713 | + cork->flags |= IPCORK_ALLFRAG; | |
2714 | + cork->length = 0; | |
2715 | + exthdrlen = (opt ? opt->opt_flen : 0); | |
2716 | + length += exthdrlen; | |
2717 | + transhdrlen += exthdrlen; | |
2718 | + dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len; | |
2719 | + } else { | |
2720 | + rt = (struct rt6_info *)cork->dst; | |
2721 | + fl6 = &inet->cork.fl.u.ip6; | |
2722 | + opt = np->cork.opt; | |
2723 | + transhdrlen = 0; | |
2724 | + exthdrlen = 0; | |
2725 | + dst_exthdrlen = 0; | |
2726 | + mtu = cork->fragsize; | |
2727 | + } | |
2728 | + | |
2729 | + hh_len = LL_RESERVED_SPACE(rt->dst.dev); | |
2730 | + | |
2731 | + fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len + | |
2732 | + (opt ? opt->opt_nflen : 0); | |
2733 | + maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr); | |
2734 | + | |
2735 | + if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) { | |
2736 | + if (cork->length + length > sizeof(struct ipv6hdr) + IPV6_MAXPLEN - fragheaderlen) { | |
2737 | + ipv6_local_error(sk, EMSGSIZE, fl6, mtu-exthdrlen); | |
2738 | + return -EMSGSIZE; | |
2739 | + } | |
2740 | + } | |
2741 | + | |
2742 | + /* For UDP, check if TX timestamp is enabled */ | |
2743 | + if (sk->sk_type == SOCK_DGRAM) | |
2744 | + sock_tx_timestamp(sk, &tx_flags); | |
2745 | + | |
2746 | + /* | |
2747 | + * Let's try using as much space as possible. | |
2748 | + * Use MTU if total length of the message fits into the MTU. | |
2749 | + * Otherwise, we need to reserve fragment header and | |
2750 | + * fragment alignment (= 8-15 octects, in total). | |
2751 | + * | |
2752 | + * Note that we may need to "move" the data from the tail of | |
2753 | + * of the buffer to the new fragment when we split | |
2754 | + * the message. | |
2755 | + * | |
2756 | + * FIXME: It may be fragmented into multiple chunks | |
2757 | + * at once if non-fragmentable extension headers | |
2758 | + * are too large. | |
2759 | + * --yoshfuji | |
2760 | + */ | |
2761 | + | |
2762 | + if ((length > mtu) && dontfrag && (sk->sk_protocol == IPPROTO_UDP || | |
2763 | + sk->sk_protocol == IPPROTO_RAW)) { | |
2764 | + ipv6_local_rxpmtu(sk, fl6, mtu-exthdrlen); | |
2765 | + return -EMSGSIZE; | |
2766 | + } | |
2767 | + | |
2768 | + skb = skb_peek_tail(&sk->sk_write_queue); | |
2769 | + cork->length += length; | |
2770 | + if (((length > mtu) || | |
2771 | + (skb && skb_has_frags(skb))) && | |
2772 | + (sk->sk_protocol == IPPROTO_UDP) && | |
2773 | + (rt->dst.dev->features & NETIF_F_UFO)) { | |
2774 | + err = ip6_ufo_append_data(sk, getfrag, from, length, | |
2775 | + hh_len, fragheaderlen, | |
2776 | + transhdrlen, mtu, flags, rt); | |
2777 | + if (err) | |
2778 | + goto error; | |
2779 | + return 0; | |
2780 | + } | |
2781 | + | |
2782 | + if (!skb) | |
2783 | + goto alloc_new_skb; | |
2784 | + | |
2785 | + while (length > 0) { | |
2786 | + /* Check if the remaining data fits into current packet. */ | |
2787 | + copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; | |
2788 | + if (copy < length) | |
2789 | + copy = maxfraglen - skb->len; | |
2790 | + | |
2791 | + if (copy <= 0) { | |
2792 | + char *data; | |
2793 | + unsigned int datalen; | |
2794 | + unsigned int fraglen; | |
2795 | + unsigned int fraggap; | |
2796 | + unsigned int alloclen; | |
2797 | +alloc_new_skb: | |
2798 | + /* There's no room in the current skb */ | |
2799 | + if (skb) | |
2800 | + fraggap = skb->len - maxfraglen; | |
2801 | + else | |
2802 | + fraggap = 0; | |
2803 | + /* update mtu and maxfraglen if necessary */ | |
2804 | + if (skb == NULL || skb_prev == NULL) | |
2805 | + ip6_append_data_mtu(&mtu, &maxfraglen, | |
2806 | + fragheaderlen, skb, rt, | |
2807 | + np->pmtudisc == | |
2808 | + IPV6_PMTUDISC_PROBE); | |
2809 | + | |
2810 | + skb_prev = skb; | |
2811 | + | |
2812 | + /* | |
2813 | + * If remaining data exceeds the mtu, | |
2814 | + * we know we need more fragment(s). | |
2815 | + */ | |
2816 | + datalen = length + fraggap; | |
2817 | + | |
2818 | + if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) | |
2819 | + datalen = maxfraglen - fragheaderlen - rt->dst.trailer_len; | |
2820 | + if ((flags & MSG_MORE) && | |
2821 | + !(rt->dst.dev->features&NETIF_F_SG)) | |
2822 | + alloclen = mtu; | |
2823 | + else | |
2824 | + alloclen = datalen + fragheaderlen; | |
2825 | + | |
2826 | + alloclen += dst_exthdrlen; | |
2827 | + | |
2828 | + if (datalen != length + fraggap) { | |
2829 | + /* | |
2830 | + * this is not the last fragment, the trailer | |
2831 | + * space is regarded as data space. | |
2832 | + */ | |
2833 | + datalen += rt->dst.trailer_len; | |
2834 | + } | |
2835 | + | |
2836 | + alloclen += rt->dst.trailer_len; | |
2837 | + fraglen = datalen + fragheaderlen; | |
2838 | + | |
2839 | + /* | |
2840 | + * We just reserve space for fragment header. | |
2841 | + * Note: this may be overallocation if the message | |
2842 | + * (without MSG_MORE) fits into the MTU. | |
2843 | + */ | |
2844 | + alloclen += sizeof(struct frag_hdr); | |
2845 | + | |
2846 | + if (transhdrlen) { | |
2847 | + skb = sock_alloc_send_skb(sk, | |
2848 | + alloclen + hh_len, | |
2849 | + (flags & MSG_DONTWAIT), &err); | |
2850 | + } else { | |
2851 | + skb = NULL; | |
2852 | + if (atomic_read(&sk->sk_wmem_alloc) <= | |
2853 | + 2 * sk->sk_sndbuf) | |
2854 | + skb = sock_wmalloc(sk, | |
2855 | + alloclen + hh_len, 1, | |
2856 | + sk->sk_allocation); | |
2857 | + if (unlikely(skb == NULL)) | |
2858 | + err = -ENOBUFS; | |
2859 | + else { | |
2860 | + /* Only the initial fragment | |
2861 | + * is time stamped. | |
2862 | + */ | |
2863 | + tx_flags = 0; | |
2864 | + } | |
2865 | + } | |
2866 | + if (skb == NULL) | |
2867 | + goto error; | |
2868 | + /* | |
2869 | + * Fill in the control structures | |
2870 | + */ | |
2871 | + skb->ip_summed = CHECKSUM_NONE; | |
2872 | + skb->csum = 0; | |
2873 | + /* reserve for fragmentation and ipsec header */ | |
2874 | + skb_reserve(skb, hh_len + sizeof(struct frag_hdr) + | |
2875 | + dst_exthdrlen); | |
2876 | + | |
2877 | + if (sk->sk_type == SOCK_DGRAM) | |
2878 | + skb_shinfo(skb)->tx_flags = tx_flags; | |
2879 | + | |
2880 | + /* | |
2881 | + * Find where to start putting bytes | |
2882 | + */ | |
2883 | + data = skb_put(skb, fraglen); | |
2884 | + skb_set_network_header(skb, exthdrlen); | |
2885 | + data += fragheaderlen; | |
2886 | + skb->transport_header = (skb->network_header + | |
2887 | + fragheaderlen); | |
2888 | + if (fraggap) { | |
2889 | + skb->csum = skb_copy_and_csum_bits( | |
2890 | + skb_prev, maxfraglen, | |
2891 | + data + transhdrlen, fraggap, 0); | |
2892 | + skb_prev->csum = csum_sub(skb_prev->csum, | |
2893 | + skb->csum); | |
2894 | + data += fraggap; | |
2895 | + pskb_trim_unique(skb_prev, maxfraglen); | |
2896 | + } | |
2897 | + copy = datalen - transhdrlen - fraggap; | |
2898 | + | |
2899 | + if (copy < 0) { | |
2900 | + err = -EINVAL; | |
2901 | + kfree_skb(skb); | |
2902 | + goto error; | |
2903 | + } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { | |
2904 | + err = -EFAULT; | |
2905 | + kfree_skb(skb); | |
2906 | + goto error; | |
2907 | + } | |
2908 | + | |
2909 | + offset += copy; | |
2910 | + length -= datalen - fraggap; | |
2911 | + transhdrlen = 0; | |
2912 | + exthdrlen = 0; | |
2913 | + dst_exthdrlen = 0; | |
2914 | + | |
2915 | + /* | |
2916 | + * Put the packet on the pending queue | |
2917 | + */ | |
2918 | + __skb_queue_tail(&sk->sk_write_queue, skb); | |
2919 | + continue; | |
2920 | + } | |
2921 | + | |
2922 | + if (copy > length) | |
2923 | + copy = length; | |
2924 | + | |
2925 | + if (!(rt->dst.dev->features&NETIF_F_SG)) { | |
2926 | + unsigned int off; | |
2927 | + | |
2928 | + off = skb->len; | |
2929 | + if (getfrag(from, skb_put(skb, copy), | |
2930 | + offset, copy, off, skb) < 0) { | |
2931 | + __skb_trim(skb, off); | |
2932 | + err = -EFAULT; | |
2933 | + goto error; | |
2934 | + } | |
2935 | + } else { | |
2936 | + int i = skb_shinfo(skb)->nr_frags; | |
2937 | + struct page_frag *pfrag = sk_page_frag(sk); | |
2938 | + | |
2939 | + err = -ENOMEM; | |
2940 | + if (!sk_page_frag_refill(sk, pfrag)) | |
2941 | + goto error; | |
2942 | + | |
2943 | + if (!skb_can_coalesce(skb, i, pfrag->page, | |
2944 | + pfrag->offset)) { | |
2945 | + err = -EMSGSIZE; | |
2946 | + if (i == MAX_SKB_FRAGS) | |
2947 | + goto error; | |
2948 | + | |
2949 | + __skb_fill_page_desc(skb, i, pfrag->page, | |
2950 | + pfrag->offset, 0); | |
2951 | + skb_shinfo(skb)->nr_frags = ++i; | |
2952 | + get_page(pfrag->page); | |
2953 | + } | |
2954 | + copy = min_t(int, copy, pfrag->size - pfrag->offset); | |
2955 | + if (getfrag(from, | |
2956 | + page_address(pfrag->page) + pfrag->offset, | |
2957 | + offset, copy, skb->len, skb) < 0) | |
2958 | + goto error_efault; | |
2959 | + | |
2960 | + pfrag->offset += copy; | |
2961 | + skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); | |
2962 | + skb->len += copy; | |
2963 | + skb->data_len += copy; | |
2964 | + skb->truesize += copy; | |
2965 | + atomic_add(copy, &sk->sk_wmem_alloc); | |
2966 | + } | |
2967 | + offset += copy; | |
2968 | + length -= copy; | |
2969 | + } | |
2970 | + | |
2971 | + return 0; | |
2972 | + | |
2973 | +error_efault: | |
2974 | + err = -EFAULT; | |
2975 | +error: | |
2976 | + cork->length -= length; | |
2977 | + IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); | |
2978 | + return err; | |
2979 | +} | |
2980 | +EXPORT_SYMBOL_GPL(ip6_append_data); | |
2981 | + | |
2982 | +static void ip6_cork_release(struct inet_sock *inet, struct ipv6_pinfo *np) | |
2983 | +{ | |
2984 | + if (np->cork.opt) { | |
2985 | + kfree(np->cork.opt->dst0opt); | |
2986 | + kfree(np->cork.opt->dst1opt); | |
2987 | + kfree(np->cork.opt->hopopt); | |
2988 | + kfree(np->cork.opt->srcrt); | |
2989 | + kfree(np->cork.opt); | |
2990 | + np->cork.opt = NULL; | |
2991 | + } | |
2992 | + | |
2993 | + if (inet->cork.base.dst) { | |
2994 | + dst_release(inet->cork.base.dst); | |
2995 | + inet->cork.base.dst = NULL; | |
2996 | + inet->cork.base.flags &= ~IPCORK_ALLFRAG; | |
2997 | + } | |
2998 | + memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); | |
2999 | +} | |
3000 | + | |
3001 | +int ip6_push_pending_frames(struct sock *sk) | |
3002 | +{ | |
3003 | + struct sk_buff *skb, *tmp_skb; | |
3004 | + struct sk_buff **tail_skb; | |
3005 | + struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; | |
3006 | + struct inet_sock *inet = inet_sk(sk); | |
3007 | + struct ipv6_pinfo *np = inet6_sk(sk); | |
3008 | + struct net *net = sock_net(sk); | |
3009 | + struct ipv6hdr *hdr; | |
3010 | + struct ipv6_txoptions *opt = np->cork.opt; | |
3011 | + struct rt6_info *rt = (struct rt6_info *)inet->cork.base.dst; | |
3012 | + struct flowi6 *fl6 = &inet->cork.fl.u.ip6; | |
3013 | + unsigned char proto = fl6->flowi6_proto; | |
3014 | + int err = 0; | |
3015 | + | |
3016 | + if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL) | |
3017 | + goto out; | |
3018 | + tail_skb = &(skb_shinfo(skb)->frag_list); | |
3019 | + | |
3020 | + /* move skb->data to ip header from ext header */ | |
3021 | + if (skb->data < skb_network_header(skb)) | |
3022 | + __skb_pull(skb, skb_network_offset(skb)); | |
3023 | + while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { | |
3024 | + __skb_pull(tmp_skb, skb_network_header_len(skb)); | |
3025 | + *tail_skb = tmp_skb; | |
3026 | + tail_skb = &(tmp_skb->next); | |
3027 | + skb->len += tmp_skb->len; | |
3028 | + skb->data_len += tmp_skb->len; | |
3029 | + skb->truesize += tmp_skb->truesize; | |
3030 | + tmp_skb->destructor = NULL; | |
3031 | + tmp_skb->sk = NULL; | |
3032 | + } | |
3033 | + | |
3034 | + /* Allow local fragmentation. */ | |
3035 | + if (np->pmtudisc < IPV6_PMTUDISC_DO) | |
3036 | + skb->local_df = 1; | |
3037 | + | |
3038 | + *final_dst = fl6->daddr; | |
3039 | + __skb_pull(skb, skb_network_header_len(skb)); | |
3040 | + if (opt && opt->opt_flen) | |
3041 | + ipv6_push_frag_opts(skb, opt, &proto); | |
3042 | + if (opt && opt->opt_nflen) | |
3043 | + ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); | |
3044 | + | |
3045 | + skb_push(skb, sizeof(struct ipv6hdr)); | |
3046 | + skb_reset_network_header(skb); | |
3047 | + hdr = ipv6_hdr(skb); | |
3048 | + | |
3049 | + ip6_flow_hdr(hdr, np->cork.tclass, fl6->flowlabel); | |
3050 | + hdr->hop_limit = np->cork.hop_limit; | |
3051 | + hdr->nexthdr = proto; | |
3052 | + hdr->saddr = fl6->saddr; | |
3053 | + hdr->daddr = *final_dst; | |
3054 | + | |
3055 | + skb->priority = sk->sk_priority; | |
3056 | + skb->mark = sk->sk_mark; | |
3057 | + | |
3058 | + skb_dst_set(skb, dst_clone(&rt->dst)); | |
3059 | + IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); | |
3060 | + if (proto == IPPROTO_ICMPV6) { | |
3061 | + struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); | |
3062 | + | |
3063 | + ICMP6MSGOUT_INC_STATS_BH(net, idev, icmp6_hdr(skb)->icmp6_type); | |
3064 | + ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); | |
3065 | + } | |
3066 | + | |
3067 | + err = ip6_local_out(skb); | |
3068 | + if (err) { | |
3069 | + if (err > 0) | |
3070 | + err = net_xmit_errno(err); | |
3071 | + if (err) | |
3072 | + goto error; | |
3073 | + } | |
3074 | + | |
3075 | +out: | |
3076 | + ip6_cork_release(inet, np); | |
3077 | + return err; | |
3078 | +error: | |
3079 | + IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); | |
3080 | + goto out; | |
3081 | +} | |
3082 | +EXPORT_SYMBOL_GPL(ip6_push_pending_frames); | |
3083 | + | |
3084 | +void ip6_flush_pending_frames(struct sock *sk) | |
3085 | +{ | |
3086 | + struct sk_buff *skb; | |
3087 | + | |
3088 | + while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) { | |
3089 | + if (skb_dst(skb)) | |
3090 | + IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)), | |
3091 | + IPSTATS_MIB_OUTDISCARDS); | |
3092 | + kfree_skb(skb); | |
3093 | + } | |
3094 | + | |
3095 | + ip6_cork_release(inet_sk(sk), inet6_sk(sk)); | |
3096 | +} | |
3097 | +EXPORT_SYMBOL_GPL(ip6_flush_pending_frames); | |
3098 | diff -Naur linux-3.10.30.org/net/netfilter/core.c linux-3.10.30/net/netfilter/core.c | |
3099 | --- linux-3.10.30.org/net/netfilter/core.c 2014-02-13 22:48:15.000000000 +0100 | |
3100 | +++ linux-3.10.30/net/netfilter/core.c 2014-02-14 20:29:05.392738001 +0100 | |
3101 | @@ -191,9 +191,11 @@ | |
3102 | ret = NF_DROP_GETERR(verdict); | |
3103 | if (ret == 0) | |
3104 | ret = -EPERM; | |
3105 | - } else if ((verdict & NF_VERDICT_MASK) == NF_QUEUE) { | |
3106 | + } else if ((verdict & NF_VERDICT_MASK) == NF_QUEUE || | |
3107 | + (verdict & NF_VERDICT_MASK) == NF_IMQ_QUEUE) { | |
3108 | int err = nf_queue(skb, elem, pf, hook, indev, outdev, okfn, | |
3109 | - verdict >> NF_VERDICT_QBITS); | |
3110 | + verdict >> NF_VERDICT_QBITS, | |
3111 | + verdict & NF_VERDICT_MASK); | |
3112 | if (err < 0) { | |
3113 | if (err == -ECANCELED) | |
3114 | goto next_hook; | |
3115 | diff -Naur linux-3.10.30.org/net/netfilter/Kconfig linux-3.10.30/net/netfilter/Kconfig | |
3116 | --- linux-3.10.30.org/net/netfilter/Kconfig 2014-02-13 22:48:15.000000000 +0100 | |
3117 | +++ linux-3.10.30/net/netfilter/Kconfig 2014-02-14 20:29:05.396071847 +0100 | |
3118 | @@ -641,6 +641,18 @@ | |
3119 | ||
3120 | To compile it as a module, choose M here. If unsure, say N. | |
3121 | ||
3122 | +config NETFILTER_XT_TARGET_IMQ | |
3123 | + tristate '"IMQ" target support' | |
3124 | + depends on NETFILTER_XTABLES | |
3125 | + depends on IP_NF_MANGLE || IP6_NF_MANGLE | |
3126 | + select IMQ | |
3127 | + default m if NETFILTER_ADVANCED=n | |
3128 | + help | |
3129 | + This option adds a `IMQ' target which is used to specify if and | |
3130 | + to which imq device packets should get enqueued/dequeued. | |
3131 | + | |
3132 | + To compile it as a module, choose M here. If unsure, say N. | |
3133 | + | |
3134 | config NETFILTER_XT_TARGET_MARK | |
3135 | tristate '"MARK" target support' | |
3136 | depends on NETFILTER_ADVANCED | |
3137 | diff -Naur linux-3.10.30.org/net/netfilter/Makefile linux-3.10.30/net/netfilter/Makefile | |
3138 | --- linux-3.10.30.org/net/netfilter/Makefile 2014-02-13 22:48:15.000000000 +0100 | |
3139 | +++ linux-3.10.30/net/netfilter/Makefile 2014-02-14 20:29:05.396071847 +0100 | |
3140 | @@ -82,6 +82,7 @@ | |
3141 | obj-$(CONFIG_NETFILTER_XT_TARGET_DSCP) += xt_DSCP.o | |
3142 | obj-$(CONFIG_NETFILTER_XT_TARGET_HL) += xt_HL.o | |
3143 | obj-$(CONFIG_NETFILTER_XT_TARGET_HMARK) += xt_HMARK.o | |
3144 | +obj-$(CONFIG_NETFILTER_XT_TARGET_IMQ) += xt_IMQ.o | |
3145 | obj-$(CONFIG_NETFILTER_XT_TARGET_LED) += xt_LED.o | |
3146 | obj-$(CONFIG_NETFILTER_XT_TARGET_LOG) += xt_LOG.o | |
3147 | obj-$(CONFIG_NETFILTER_XT_TARGET_NETMAP) += xt_NETMAP.o | |
3148 | diff -Naur linux-3.10.30.org/net/netfilter/nf_internals.h linux-3.10.30/net/netfilter/nf_internals.h | |
3149 | --- linux-3.10.30.org/net/netfilter/nf_internals.h 2014-02-13 22:48:15.000000000 +0100 | |
3150 | +++ linux-3.10.30/net/netfilter/nf_internals.h 2014-02-14 20:29:05.396071847 +0100 | |
3151 | @@ -29,7 +29,7 @@ | |
3152 | struct net_device *indev, | |
3153 | struct net_device *outdev, | |
3154 | int (*okfn)(struct sk_buff *), | |
3155 | - unsigned int queuenum); | |
3156 | + unsigned int queuenum, unsigned int queuetype); | |
3157 | extern int __init netfilter_queue_init(void); | |
3158 | ||
3159 | /* nf_log.c */ | |
3160 | diff -Naur linux-3.10.30.org/net/netfilter/nf_queue.c linux-3.10.30/net/netfilter/nf_queue.c | |
3161 | --- linux-3.10.30.org/net/netfilter/nf_queue.c 2014-02-13 22:48:15.000000000 +0100 | |
3162 | +++ linux-3.10.30/net/netfilter/nf_queue.c 2014-02-14 20:29:05.396071847 +0100 | |
3163 | @@ -27,6 +27,23 @@ | |
3164 | */ | |
3165 | static const struct nf_queue_handler __rcu *queue_handler __read_mostly; | |
3166 | ||
3167 | +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) | |
3168 | +static const struct nf_queue_handler __rcu *queue_imq_handler __read_mostly; | |
3169 | + | |
3170 | +void nf_register_queue_imq_handler(const struct nf_queue_handler *qh) | |
3171 | +{ | |
3172 | + rcu_assign_pointer(queue_imq_handler, qh); | |
3173 | +} | |
3174 | +EXPORT_SYMBOL_GPL(nf_register_queue_imq_handler); | |
3175 | + | |
3176 | +void nf_unregister_queue_imq_handler(void) | |
3177 | +{ | |
3178 | + RCU_INIT_POINTER(queue_imq_handler, NULL); | |
3179 | + synchronize_rcu(); | |
3180 | +} | |
3181 | +EXPORT_SYMBOL_GPL(nf_unregister_queue_imq_handler); | |
3182 | +#endif | |
3183 | + | |
3184 | /* return EBUSY when somebody else is registered, return EEXIST if the | |
3185 | * same handler is registered, return 0 in case of success. */ | |
3186 | void nf_register_queue_handler(const struct nf_queue_handler *qh) | |
3187 | @@ -105,7 +122,8 @@ | |
3188 | struct net_device *indev, | |
3189 | struct net_device *outdev, | |
3190 | int (*okfn)(struct sk_buff *), | |
3191 | - unsigned int queuenum) | |
3192 | + unsigned int queuenum, | |
3193 | + unsigned int queuetype) | |
3194 | { | |
3195 | int status = -ENOENT; | |
3196 | struct nf_queue_entry *entry = NULL; | |
3197 | @@ -115,7 +133,17 @@ | |
3198 | /* QUEUE == DROP if no one is waiting, to be safe. */ | |
3199 | rcu_read_lock(); | |
3200 | ||
3201 | - qh = rcu_dereference(queue_handler); | |
3202 | + if (queuetype == NF_IMQ_QUEUE) { | |
3203 | +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) | |
3204 | + qh = rcu_dereference(queue_imq_handler); | |
3205 | +#else | |
3206 | + BUG(); | |
3207 | + goto err_unlock; | |
3208 | +#endif | |
3209 | + } else { | |
3210 | + qh = rcu_dereference(queue_handler); | |
3211 | + } | |
3212 | + | |
3213 | if (!qh) { | |
3214 | status = -ESRCH; | |
3215 | goto err_unlock; | |
3216 | @@ -205,9 +233,11 @@ | |
3217 | local_bh_enable(); | |
3218 | break; | |
3219 | case NF_QUEUE: | |
3220 | + case NF_IMQ_QUEUE: | |
3221 | err = nf_queue(skb, elem, entry->pf, entry->hook, | |
3222 | entry->indev, entry->outdev, entry->okfn, | |
3223 | - verdict >> NF_VERDICT_QBITS); | |
3224 | + verdict >> NF_VERDICT_QBITS, | |
3225 | + verdict & NF_VERDICT_MASK); | |
3226 | if (err < 0) { | |
3227 | if (err == -ECANCELED) | |
3228 | goto next_hook; | |
3229 | diff -Naur linux-3.10.30.org/net/netfilter/xt_IMQ.c linux-3.10.30/net/netfilter/xt_IMQ.c | |
3230 | --- linux-3.10.30.org/net/netfilter/xt_IMQ.c 1970-01-01 01:00:00.000000000 +0100 | |
3231 | +++ linux-3.10.30/net/netfilter/xt_IMQ.c 2014-02-14 20:29:05.396071847 +0100 | |
3232 | @@ -0,0 +1,72 @@ | |
3233 | +/* | |
3234 | + * This target marks packets to be enqueued to an imq device | |
3235 | + */ | |
3236 | +#include <linux/module.h> | |
3237 | +#include <linux/skbuff.h> | |
3238 | +#include <linux/netfilter/x_tables.h> | |
3239 | +#include <linux/netfilter/xt_IMQ.h> | |
3240 | +#include <linux/imq.h> | |
3241 | + | |
3242 | +static unsigned int imq_target(struct sk_buff *pskb, | |
3243 | + const struct xt_action_param *par) | |
3244 | +{ | |
3245 | + const struct xt_imq_info *mr = par->targinfo; | |
3246 | + | |
3247 | + pskb->imq_flags = (mr->todev & IMQ_F_IFMASK) | IMQ_F_ENQUEUE; | |
3248 | + | |
3249 | + return XT_CONTINUE; | |
3250 | +} | |
3251 | + | |
3252 | +static int imq_checkentry(const struct xt_tgchk_param *par) | |
3253 | +{ | |
3254 | + struct xt_imq_info *mr = par->targinfo; | |
3255 | + | |
3256 | + if (mr->todev > IMQ_MAX_DEVS - 1) { | |
3257 | + pr_warn("IMQ: invalid device specified, highest is %u\n", | |
3258 | + IMQ_MAX_DEVS - 1); | |
3259 | + return -EINVAL; | |
3260 | + } | |
3261 | + | |
3262 | + return 0; | |
3263 | +} | |
3264 | + | |
3265 | +static struct xt_target xt_imq_reg[] __read_mostly = { | |
3266 | + { | |
3267 | + .name = "IMQ", | |
3268 | + .family = AF_INET, | |
3269 | + .checkentry = imq_checkentry, | |
3270 | + .target = imq_target, | |
3271 | + .targetsize = sizeof(struct xt_imq_info), | |
3272 | + .table = "mangle", | |
3273 | + .me = THIS_MODULE | |
3274 | + }, | |
3275 | + { | |
3276 | + .name = "IMQ", | |
3277 | + .family = AF_INET6, | |
3278 | + .checkentry = imq_checkentry, | |
3279 | + .target = imq_target, | |
3280 | + .targetsize = sizeof(struct xt_imq_info), | |
3281 | + .table = "mangle", | |
3282 | + .me = THIS_MODULE | |
3283 | + }, | |
3284 | +}; | |
3285 | + | |
3286 | +static int __init imq_init(void) | |
3287 | +{ | |
3288 | + return xt_register_targets(xt_imq_reg, ARRAY_SIZE(xt_imq_reg)); | |
3289 | +} | |
3290 | + | |
3291 | +static void __exit imq_fini(void) | |
3292 | +{ | |
3293 | + xt_unregister_targets(xt_imq_reg, ARRAY_SIZE(xt_imq_reg)); | |
3294 | +} | |
3295 | + | |
3296 | +module_init(imq_init); | |
3297 | +module_exit(imq_fini); | |
3298 | + | |
3299 | +MODULE_AUTHOR("http://www.linuximq.net"); | |
3300 | +MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See http://www.linuximq.net/ for more information."); | |
3301 | +MODULE_LICENSE("GPL"); | |
3302 | +MODULE_ALIAS("ipt_IMQ"); | |
3303 | +MODULE_ALIAS("ip6t_IMQ"); | |
3304 | + |