Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * ROUTE - implementation of the IP router. | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
11 | * Linus Torvalds, <Linus.Torvalds@helsinki.fi> | |
12 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
13 | * | |
14 | * Fixes: | |
15 | * Alan Cox : Verify area fixes. | |
16 | * Alan Cox : cli() protects routing changes | |
17 | * Rui Oliveira : ICMP routing table updates | |
18 | * (rco@di.uminho.pt) Routing table insertion and update | |
19 | * Linus Torvalds : Rewrote bits to be sensible | |
20 | * Alan Cox : Added BSD route gw semantics | |
e905a9ed | 21 | * Alan Cox : Super /proc >4K |
1da177e4 LT |
22 | * Alan Cox : MTU in route table |
23 | * Alan Cox : MSS actually. Also added the window | |
24 | * clamper. | |
25 | * Sam Lantinga : Fixed route matching in rt_del() | |
26 | * Alan Cox : Routing cache support. | |
27 | * Alan Cox : Removed compatibility cruft. | |
28 | * Alan Cox : RTF_REJECT support. | |
29 | * Alan Cox : TCP irtt support. | |
30 | * Jonathan Naylor : Added Metric support. | |
31 | * Miquel van Smoorenburg : BSD API fixes. | |
32 | * Miquel van Smoorenburg : Metrics. | |
33 | * Alan Cox : Use __u32 properly | |
34 | * Alan Cox : Aligned routing errors more closely with BSD | |
35 | * our system is still very different. | |
36 | * Alan Cox : Faster /proc handling | |
37 | * Alexey Kuznetsov : Massive rework to support tree based routing, | |
38 | * routing caches and better behaviour. | |
e905a9ed | 39 | * |
1da177e4 LT |
40 | * Olaf Erb : irtt wasn't being copied right. |
41 | * Bjorn Ekwall : Kerneld route support. | |
42 | * Alan Cox : Multicast fixed (I hope) | |
43 | * Pavel Krauz : Limited broadcast fixed | |
44 | * Mike McLagan : Routing by source | |
45 | * Alexey Kuznetsov : End of old history. Split to fib.c and | |
46 | * route.c and rewritten from scratch. | |
47 | * Andi Kleen : Load-limit warning messages. | |
48 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. | |
49 | * Vitaly E. Lavrov : Race condition in ip_route_input_slow. | |
50 | * Tobias Ringstrom : Uninitialized res.type in ip_route_output_slow. | |
51 | * Vladimir V. Ivanov : IP rule info (flowid) is really useful. | |
52 | * Marc Boucher : routing by fwmark | |
53 | * Robert Olsson : Added rt_cache statistics | |
54 | * Arnaldo C. Melo : Convert proc stuff to seq_file | |
bb1d23b0 | 55 | * Eric Dumazet : hashed spinlocks and rt_check_expire() fixes. |
cef2685e IS |
56 | * Ilia Sotnikov : Ignore TOS on PMTUD and Redirect |
57 | * Ilia Sotnikov : Removed TOS from hash calculations | |
1da177e4 LT |
58 | * |
59 | * This program is free software; you can redistribute it and/or | |
60 | * modify it under the terms of the GNU General Public License | |
61 | * as published by the Free Software Foundation; either version | |
62 | * 2 of the License, or (at your option) any later version. | |
63 | */ | |
64 | ||
afd46503 JP |
65 | #define pr_fmt(fmt) "IPv4: " fmt |
66 | ||
1da177e4 LT |
67 | #include <linux/module.h> |
68 | #include <asm/uaccess.h> | |
1da177e4 LT |
69 | #include <linux/bitops.h> |
70 | #include <linux/types.h> | |
71 | #include <linux/kernel.h> | |
1da177e4 | 72 | #include <linux/mm.h> |
424c4b70 | 73 | #include <linux/bootmem.h> |
1da177e4 LT |
74 | #include <linux/string.h> |
75 | #include <linux/socket.h> | |
76 | #include <linux/sockios.h> | |
77 | #include <linux/errno.h> | |
78 | #include <linux/in.h> | |
79 | #include <linux/inet.h> | |
80 | #include <linux/netdevice.h> | |
81 | #include <linux/proc_fs.h> | |
82 | #include <linux/init.h> | |
39c90ece | 83 | #include <linux/workqueue.h> |
1da177e4 | 84 | #include <linux/skbuff.h> |
1da177e4 LT |
85 | #include <linux/inetdevice.h> |
86 | #include <linux/igmp.h> | |
87 | #include <linux/pkt_sched.h> | |
88 | #include <linux/mroute.h> | |
89 | #include <linux/netfilter_ipv4.h> | |
90 | #include <linux/random.h> | |
91 | #include <linux/jhash.h> | |
92 | #include <linux/rcupdate.h> | |
93 | #include <linux/times.h> | |
5a0e3ad6 | 94 | #include <linux/slab.h> |
b9eda06f | 95 | #include <linux/prefetch.h> |
352e512c | 96 | #include <net/dst.h> |
457c4cbc | 97 | #include <net/net_namespace.h> |
1da177e4 LT |
98 | #include <net/protocol.h> |
99 | #include <net/ip.h> | |
100 | #include <net/route.h> | |
101 | #include <net/inetpeer.h> | |
102 | #include <net/sock.h> | |
103 | #include <net/ip_fib.h> | |
104 | #include <net/arp.h> | |
105 | #include <net/tcp.h> | |
106 | #include <net/icmp.h> | |
107 | #include <net/xfrm.h> | |
8d71740c | 108 | #include <net/netevent.h> |
63f3444f | 109 | #include <net/rtnetlink.h> |
1da177e4 LT |
110 | #ifdef CONFIG_SYSCTL |
111 | #include <linux/sysctl.h> | |
7426a564 | 112 | #include <linux/kmemleak.h> |
1da177e4 | 113 | #endif |
6e5714ea | 114 | #include <net/secure_seq.h> |
1da177e4 | 115 | |
68a5e3dd | 116 | #define RT_FL_TOS(oldflp4) \ |
f61759e6 | 117 | ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK)) |
1da177e4 LT |
118 | |
119 | #define IP_MAX_MTU 0xFFF0 | |
120 | ||
121 | #define RT_GC_TIMEOUT (300*HZ) | |
122 | ||
1da177e4 | 123 | static int ip_rt_max_size; |
817bc4db | 124 | static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; |
9f28a2fc | 125 | static int ip_rt_gc_interval __read_mostly = 60 * HZ; |
817bc4db SH |
126 | static int ip_rt_gc_min_interval __read_mostly = HZ / 2; |
127 | static int ip_rt_redirect_number __read_mostly = 9; | |
128 | static int ip_rt_redirect_load __read_mostly = HZ / 50; | |
129 | static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); | |
130 | static int ip_rt_error_cost __read_mostly = HZ; | |
131 | static int ip_rt_error_burst __read_mostly = 5 * HZ; | |
132 | static int ip_rt_gc_elasticity __read_mostly = 8; | |
133 | static int ip_rt_mtu_expires __read_mostly = 10 * 60 * HZ; | |
134 | static int ip_rt_min_pmtu __read_mostly = 512 + 20 + 20; | |
135 | static int ip_rt_min_advmss __read_mostly = 256; | |
9f28a2fc | 136 | |
1da177e4 LT |
137 | /* |
138 | * Interface to generic destination cache. | |
139 | */ | |
140 | ||
141 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); | |
0dbaee3b | 142 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 143 | static unsigned int ipv4_mtu(const struct dst_entry *dst); |
1da177e4 LT |
144 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); |
145 | static void ipv4_link_failure(struct sk_buff *skb); | |
6700c270 DM |
146 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
147 | struct sk_buff *skb, u32 mtu); | |
148 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, | |
149 | struct sk_buff *skb); | |
1da177e4 | 150 | |
72cdd1d9 ED |
151 | static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
152 | int how) | |
153 | { | |
154 | } | |
1da177e4 | 155 | |
62fa8a84 DM |
156 | static u32 *ipv4_cow_metrics(struct dst_entry *dst, unsigned long old) |
157 | { | |
31248731 DM |
158 | WARN_ON(1); |
159 | return NULL; | |
62fa8a84 DM |
160 | } |
161 | ||
f894cbf8 DM |
162 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
163 | struct sk_buff *skb, | |
164 | const void *daddr); | |
d3aaeb38 | 165 | |
1da177e4 LT |
166 | static struct dst_ops ipv4_dst_ops = { |
167 | .family = AF_INET, | |
09640e63 | 168 | .protocol = cpu_to_be16(ETH_P_IP), |
1da177e4 | 169 | .check = ipv4_dst_check, |
0dbaee3b | 170 | .default_advmss = ipv4_default_advmss, |
ebb762f2 | 171 | .mtu = ipv4_mtu, |
62fa8a84 | 172 | .cow_metrics = ipv4_cow_metrics, |
1da177e4 LT |
173 | .ifdown = ipv4_dst_ifdown, |
174 | .negative_advice = ipv4_negative_advice, | |
175 | .link_failure = ipv4_link_failure, | |
176 | .update_pmtu = ip_rt_update_pmtu, | |
e47a185b | 177 | .redirect = ip_do_redirect, |
1ac06e03 | 178 | .local_out = __ip_local_out, |
d3aaeb38 | 179 | .neigh_lookup = ipv4_neigh_lookup, |
1da177e4 LT |
180 | }; |
181 | ||
182 | #define ECN_OR_COST(class) TC_PRIO_##class | |
183 | ||
4839c52b | 184 | const __u8 ip_tos2prio[16] = { |
1da177e4 | 185 | TC_PRIO_BESTEFFORT, |
4a2b9c37 | 186 | ECN_OR_COST(BESTEFFORT), |
1da177e4 LT |
187 | TC_PRIO_BESTEFFORT, |
188 | ECN_OR_COST(BESTEFFORT), | |
189 | TC_PRIO_BULK, | |
190 | ECN_OR_COST(BULK), | |
191 | TC_PRIO_BULK, | |
192 | ECN_OR_COST(BULK), | |
193 | TC_PRIO_INTERACTIVE, | |
194 | ECN_OR_COST(INTERACTIVE), | |
195 | TC_PRIO_INTERACTIVE, | |
196 | ECN_OR_COST(INTERACTIVE), | |
197 | TC_PRIO_INTERACTIVE_BULK, | |
198 | ECN_OR_COST(INTERACTIVE_BULK), | |
199 | TC_PRIO_INTERACTIVE_BULK, | |
200 | ECN_OR_COST(INTERACTIVE_BULK) | |
201 | }; | |
d4a96865 | 202 | EXPORT_SYMBOL(ip_tos2prio); |
1da177e4 | 203 | |
2f970d83 | 204 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
27f39c73 | 205 | #define RT_CACHE_STAT_INC(field) __this_cpu_inc(rt_cache_stat.field) |
1da177e4 | 206 | |
e84f84f2 DL |
207 | static inline int rt_genid(struct net *net) |
208 | { | |
209 | return atomic_read(&net->ipv4.rt_genid); | |
210 | } | |
211 | ||
1da177e4 | 212 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
213 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) |
214 | { | |
29e75252 | 215 | if (*pos) |
89aef892 | 216 | return NULL; |
29e75252 | 217 | return SEQ_START_TOKEN; |
1da177e4 LT |
218 | } |
219 | ||
220 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
221 | { | |
1da177e4 | 222 | ++*pos; |
89aef892 | 223 | return NULL; |
1da177e4 LT |
224 | } |
225 | ||
226 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) | |
227 | { | |
1da177e4 LT |
228 | } |
229 | ||
230 | static int rt_cache_seq_show(struct seq_file *seq, void *v) | |
231 | { | |
232 | if (v == SEQ_START_TOKEN) | |
233 | seq_printf(seq, "%-127s\n", | |
234 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" | |
235 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" | |
236 | "HHUptod\tSpecDst"); | |
e905a9ed | 237 | return 0; |
1da177e4 LT |
238 | } |
239 | ||
f690808e | 240 | static const struct seq_operations rt_cache_seq_ops = { |
1da177e4 LT |
241 | .start = rt_cache_seq_start, |
242 | .next = rt_cache_seq_next, | |
243 | .stop = rt_cache_seq_stop, | |
244 | .show = rt_cache_seq_show, | |
245 | }; | |
246 | ||
247 | static int rt_cache_seq_open(struct inode *inode, struct file *file) | |
248 | { | |
89aef892 | 249 | return seq_open(file, &rt_cache_seq_ops); |
1da177e4 LT |
250 | } |
251 | ||
9a32144e | 252 | static const struct file_operations rt_cache_seq_fops = { |
1da177e4 LT |
253 | .owner = THIS_MODULE, |
254 | .open = rt_cache_seq_open, | |
255 | .read = seq_read, | |
256 | .llseek = seq_lseek, | |
89aef892 | 257 | .release = seq_release, |
1da177e4 LT |
258 | }; |
259 | ||
260 | ||
261 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
262 | { | |
263 | int cpu; | |
264 | ||
265 | if (*pos == 0) | |
266 | return SEQ_START_TOKEN; | |
267 | ||
0f23174a | 268 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
269 | if (!cpu_possible(cpu)) |
270 | continue; | |
271 | *pos = cpu+1; | |
2f970d83 | 272 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
273 | } |
274 | return NULL; | |
275 | } | |
276 | ||
277 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
278 | { | |
279 | int cpu; | |
280 | ||
0f23174a | 281 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
282 | if (!cpu_possible(cpu)) |
283 | continue; | |
284 | *pos = cpu+1; | |
2f970d83 | 285 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
286 | } |
287 | return NULL; | |
e905a9ed | 288 | |
1da177e4 LT |
289 | } |
290 | ||
291 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) | |
292 | { | |
293 | ||
294 | } | |
295 | ||
296 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) | |
297 | { | |
298 | struct rt_cache_stat *st = v; | |
299 | ||
300 | if (v == SEQ_START_TOKEN) { | |
5bec0039 | 301 | seq_printf(seq, "entries in_hit in_slow_tot in_slow_mc in_no_route in_brd in_martian_dst in_martian_src out_hit out_slow_tot out_slow_mc gc_total gc_ignored gc_goal_miss gc_dst_overflow in_hlist_search out_hlist_search\n"); |
1da177e4 LT |
302 | return 0; |
303 | } | |
e905a9ed | 304 | |
1da177e4 LT |
305 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
306 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", | |
fc66f95c | 307 | dst_entries_get_slow(&ipv4_dst_ops), |
1da177e4 LT |
308 | st->in_hit, |
309 | st->in_slow_tot, | |
310 | st->in_slow_mc, | |
311 | st->in_no_route, | |
312 | st->in_brd, | |
313 | st->in_martian_dst, | |
314 | st->in_martian_src, | |
315 | ||
316 | st->out_hit, | |
317 | st->out_slow_tot, | |
e905a9ed | 318 | st->out_slow_mc, |
1da177e4 LT |
319 | |
320 | st->gc_total, | |
321 | st->gc_ignored, | |
322 | st->gc_goal_miss, | |
323 | st->gc_dst_overflow, | |
324 | st->in_hlist_search, | |
325 | st->out_hlist_search | |
326 | ); | |
327 | return 0; | |
328 | } | |
329 | ||
f690808e | 330 | static const struct seq_operations rt_cpu_seq_ops = { |
1da177e4 LT |
331 | .start = rt_cpu_seq_start, |
332 | .next = rt_cpu_seq_next, | |
333 | .stop = rt_cpu_seq_stop, | |
334 | .show = rt_cpu_seq_show, | |
335 | }; | |
336 | ||
337 | ||
338 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) | |
339 | { | |
340 | return seq_open(file, &rt_cpu_seq_ops); | |
341 | } | |
342 | ||
9a32144e | 343 | static const struct file_operations rt_cpu_seq_fops = { |
1da177e4 LT |
344 | .owner = THIS_MODULE, |
345 | .open = rt_cpu_seq_open, | |
346 | .read = seq_read, | |
347 | .llseek = seq_lseek, | |
348 | .release = seq_release, | |
349 | }; | |
350 | ||
c7066f70 | 351 | #ifdef CONFIG_IP_ROUTE_CLASSID |
a661c419 | 352 | static int rt_acct_proc_show(struct seq_file *m, void *v) |
78c686e9 | 353 | { |
a661c419 AD |
354 | struct ip_rt_acct *dst, *src; |
355 | unsigned int i, j; | |
356 | ||
357 | dst = kcalloc(256, sizeof(struct ip_rt_acct), GFP_KERNEL); | |
358 | if (!dst) | |
359 | return -ENOMEM; | |
360 | ||
361 | for_each_possible_cpu(i) { | |
362 | src = (struct ip_rt_acct *)per_cpu_ptr(ip_rt_acct, i); | |
363 | for (j = 0; j < 256; j++) { | |
364 | dst[j].o_bytes += src[j].o_bytes; | |
365 | dst[j].o_packets += src[j].o_packets; | |
366 | dst[j].i_bytes += src[j].i_bytes; | |
367 | dst[j].i_packets += src[j].i_packets; | |
368 | } | |
78c686e9 PE |
369 | } |
370 | ||
a661c419 AD |
371 | seq_write(m, dst, 256 * sizeof(struct ip_rt_acct)); |
372 | kfree(dst); | |
373 | return 0; | |
374 | } | |
78c686e9 | 375 | |
a661c419 AD |
376 | static int rt_acct_proc_open(struct inode *inode, struct file *file) |
377 | { | |
378 | return single_open(file, rt_acct_proc_show, NULL); | |
78c686e9 | 379 | } |
a661c419 AD |
380 | |
381 | static const struct file_operations rt_acct_proc_fops = { | |
382 | .owner = THIS_MODULE, | |
383 | .open = rt_acct_proc_open, | |
384 | .read = seq_read, | |
385 | .llseek = seq_lseek, | |
386 | .release = single_release, | |
387 | }; | |
78c686e9 | 388 | #endif |
107f1634 | 389 | |
73b38711 | 390 | static int __net_init ip_rt_do_proc_init(struct net *net) |
107f1634 PE |
391 | { |
392 | struct proc_dir_entry *pde; | |
393 | ||
394 | pde = proc_net_fops_create(net, "rt_cache", S_IRUGO, | |
395 | &rt_cache_seq_fops); | |
396 | if (!pde) | |
397 | goto err1; | |
398 | ||
77020720 WC |
399 | pde = proc_create("rt_cache", S_IRUGO, |
400 | net->proc_net_stat, &rt_cpu_seq_fops); | |
107f1634 PE |
401 | if (!pde) |
402 | goto err2; | |
403 | ||
c7066f70 | 404 | #ifdef CONFIG_IP_ROUTE_CLASSID |
a661c419 | 405 | pde = proc_create("rt_acct", 0, net->proc_net, &rt_acct_proc_fops); |
107f1634 PE |
406 | if (!pde) |
407 | goto err3; | |
408 | #endif | |
409 | return 0; | |
410 | ||
c7066f70 | 411 | #ifdef CONFIG_IP_ROUTE_CLASSID |
107f1634 PE |
412 | err3: |
413 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
414 | #endif | |
415 | err2: | |
416 | remove_proc_entry("rt_cache", net->proc_net); | |
417 | err1: | |
418 | return -ENOMEM; | |
419 | } | |
73b38711 DL |
420 | |
421 | static void __net_exit ip_rt_do_proc_exit(struct net *net) | |
422 | { | |
423 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
424 | remove_proc_entry("rt_cache", net->proc_net); | |
c7066f70 | 425 | #ifdef CONFIG_IP_ROUTE_CLASSID |
73b38711 | 426 | remove_proc_entry("rt_acct", net->proc_net); |
0a931acf | 427 | #endif |
73b38711 DL |
428 | } |
429 | ||
430 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { | |
431 | .init = ip_rt_do_proc_init, | |
432 | .exit = ip_rt_do_proc_exit, | |
433 | }; | |
434 | ||
435 | static int __init ip_rt_proc_init(void) | |
436 | { | |
437 | return register_pernet_subsys(&ip_rt_proc_ops); | |
438 | } | |
439 | ||
107f1634 | 440 | #else |
73b38711 | 441 | static inline int ip_rt_proc_init(void) |
107f1634 PE |
442 | { |
443 | return 0; | |
444 | } | |
1da177e4 | 445 | #endif /* CONFIG_PROC_FS */ |
e905a9ed | 446 | |
e84f84f2 DL |
447 | static inline int rt_is_expired(struct rtable *rth) |
448 | { | |
d8d1f30b | 449 | return rth->rt_genid != rt_genid(dev_net(rth->dst.dev)); |
e84f84f2 DL |
450 | } |
451 | ||
29e75252 | 452 | /* |
25985edc | 453 | * Perturbation of rt_genid by a small quantity [1..256] |
29e75252 ED |
454 | * Using 8 bits of shuffling ensure we can call rt_cache_invalidate() |
455 | * many times (2^24) without giving recent rt_genid. | |
456 | * Jenkins hash is strong enough that litle changes of rt_genid are OK. | |
1da177e4 | 457 | */ |
86c657f6 | 458 | static void rt_cache_invalidate(struct net *net) |
1da177e4 | 459 | { |
29e75252 | 460 | unsigned char shuffle; |
1da177e4 | 461 | |
29e75252 | 462 | get_random_bytes(&shuffle, sizeof(shuffle)); |
e84f84f2 | 463 | atomic_add(shuffle + 1U, &net->ipv4.rt_genid); |
1da177e4 LT |
464 | } |
465 | ||
29e75252 ED |
466 | /* |
467 | * delay < 0 : invalidate cache (fast : entries will be deleted later) | |
468 | * delay >= 0 : invalidate & flush cache (can be long) | |
469 | */ | |
76e6ebfb | 470 | void rt_cache_flush(struct net *net, int delay) |
1da177e4 | 471 | { |
86c657f6 | 472 | rt_cache_invalidate(net); |
98376387 ED |
473 | } |
474 | ||
f894cbf8 DM |
475 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
476 | struct sk_buff *skb, | |
477 | const void *daddr) | |
3769cffb | 478 | { |
d3aaeb38 DM |
479 | struct net_device *dev = dst->dev; |
480 | const __be32 *pkey = daddr; | |
39232973 | 481 | const struct rtable *rt; |
3769cffb DM |
482 | struct neighbour *n; |
483 | ||
39232973 | 484 | rt = (const struct rtable *) dst; |
a263b309 | 485 | if (rt->rt_gateway) |
39232973 | 486 | pkey = (const __be32 *) &rt->rt_gateway; |
f894cbf8 DM |
487 | else if (skb) |
488 | pkey = &ip_hdr(skb)->daddr; | |
d3aaeb38 | 489 | |
80703d26 | 490 | n = __ipv4_neigh_lookup(dev, *(__force u32 *)pkey); |
d3aaeb38 DM |
491 | if (n) |
492 | return n; | |
32092ecf | 493 | return neigh_create(&arp_tbl, pkey, dev); |
d3aaeb38 DM |
494 | } |
495 | ||
1da177e4 LT |
496 | /* |
497 | * Peer allocation may fail only in serious out-of-memory conditions. However | |
498 | * we still can generate some output. | |
499 | * Random ID selection looks a bit dangerous because we have no chances to | |
500 | * select ID being unique in a reasonable period of time. | |
501 | * But broken packet identifier may be better than no packet at all. | |
502 | */ | |
503 | static void ip_select_fb_ident(struct iphdr *iph) | |
504 | { | |
505 | static DEFINE_SPINLOCK(ip_fb_id_lock); | |
506 | static u32 ip_fallback_id; | |
507 | u32 salt; | |
508 | ||
509 | spin_lock_bh(&ip_fb_id_lock); | |
e448515c | 510 | salt = secure_ip_id((__force __be32)ip_fallback_id ^ iph->daddr); |
1da177e4 LT |
511 | iph->id = htons(salt & 0xFFFF); |
512 | ip_fallback_id = salt; | |
513 | spin_unlock_bh(&ip_fb_id_lock); | |
514 | } | |
515 | ||
516 | void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) | |
517 | { | |
1d861aa4 DM |
518 | struct net *net = dev_net(dst->dev); |
519 | struct inet_peer *peer; | |
1da177e4 | 520 | |
1d861aa4 DM |
521 | peer = inet_getpeer_v4(net->ipv4.peers, iph->daddr, 1); |
522 | if (peer) { | |
523 | iph->id = htons(inet_getid(peer, more)); | |
524 | inet_putpeer(peer); | |
525 | return; | |
526 | } | |
1da177e4 LT |
527 | |
528 | ip_select_fb_ident(iph); | |
529 | } | |
4bc2f18b | 530 | EXPORT_SYMBOL(__ip_select_ident); |
1da177e4 | 531 | |
5abf7f7e | 532 | static void __build_flow_key(struct flowi4 *fl4, const struct sock *sk, |
4895c771 DM |
533 | const struct iphdr *iph, |
534 | int oif, u8 tos, | |
535 | u8 prot, u32 mark, int flow_flags) | |
536 | { | |
537 | if (sk) { | |
538 | const struct inet_sock *inet = inet_sk(sk); | |
539 | ||
540 | oif = sk->sk_bound_dev_if; | |
541 | mark = sk->sk_mark; | |
542 | tos = RT_CONN_FLAGS(sk); | |
543 | prot = inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol; | |
544 | } | |
545 | flowi4_init_output(fl4, oif, mark, tos, | |
546 | RT_SCOPE_UNIVERSE, prot, | |
547 | flow_flags, | |
548 | iph->daddr, iph->saddr, 0, 0); | |
549 | } | |
550 | ||
5abf7f7e ED |
551 | static void build_skb_flow_key(struct flowi4 *fl4, const struct sk_buff *skb, |
552 | const struct sock *sk) | |
4895c771 DM |
553 | { |
554 | const struct iphdr *iph = ip_hdr(skb); | |
555 | int oif = skb->dev->ifindex; | |
556 | u8 tos = RT_TOS(iph->tos); | |
557 | u8 prot = iph->protocol; | |
558 | u32 mark = skb->mark; | |
559 | ||
560 | __build_flow_key(fl4, sk, iph, oif, tos, prot, mark, 0); | |
561 | } | |
562 | ||
5abf7f7e | 563 | static void build_sk_flow_key(struct flowi4 *fl4, const struct sock *sk) |
4895c771 DM |
564 | { |
565 | const struct inet_sock *inet = inet_sk(sk); | |
5abf7f7e | 566 | const struct ip_options_rcu *inet_opt; |
4895c771 DM |
567 | __be32 daddr = inet->inet_daddr; |
568 | ||
569 | rcu_read_lock(); | |
570 | inet_opt = rcu_dereference(inet->inet_opt); | |
571 | if (inet_opt && inet_opt->opt.srr) | |
572 | daddr = inet_opt->opt.faddr; | |
573 | flowi4_init_output(fl4, sk->sk_bound_dev_if, sk->sk_mark, | |
574 | RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, | |
575 | inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol, | |
576 | inet_sk_flowi_flags(sk), | |
577 | daddr, inet->inet_saddr, 0, 0); | |
578 | rcu_read_unlock(); | |
579 | } | |
580 | ||
5abf7f7e ED |
581 | static void ip_rt_build_flow_key(struct flowi4 *fl4, const struct sock *sk, |
582 | const struct sk_buff *skb) | |
4895c771 DM |
583 | { |
584 | if (skb) | |
585 | build_skb_flow_key(fl4, skb, sk); | |
586 | else | |
587 | build_sk_flow_key(fl4, sk); | |
588 | } | |
589 | ||
aee06da6 | 590 | static DEFINE_SEQLOCK(fnhe_seqlock); |
4895c771 | 591 | |
aee06da6 | 592 | static struct fib_nh_exception *fnhe_oldest(struct fnhe_hash_bucket *hash) |
4895c771 DM |
593 | { |
594 | struct fib_nh_exception *fnhe, *oldest; | |
595 | ||
596 | oldest = rcu_dereference(hash->chain); | |
597 | for (fnhe = rcu_dereference(oldest->fnhe_next); fnhe; | |
598 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
599 | if (time_before(fnhe->fnhe_stamp, oldest->fnhe_stamp)) | |
600 | oldest = fnhe; | |
601 | } | |
602 | return oldest; | |
603 | } | |
604 | ||
d3a25c98 DM |
605 | static inline u32 fnhe_hashfun(__be32 daddr) |
606 | { | |
607 | u32 hval; | |
608 | ||
609 | hval = (__force u32) daddr; | |
610 | hval ^= (hval >> 11) ^ (hval >> 22); | |
611 | ||
612 | return hval & (FNHE_HASH_SIZE - 1); | |
613 | } | |
614 | ||
aee06da6 JA |
615 | static void update_or_create_fnhe(struct fib_nh *nh, __be32 daddr, __be32 gw, |
616 | u32 pmtu, unsigned long expires) | |
4895c771 | 617 | { |
aee06da6 | 618 | struct fnhe_hash_bucket *hash; |
4895c771 DM |
619 | struct fib_nh_exception *fnhe; |
620 | int depth; | |
aee06da6 JA |
621 | u32 hval = fnhe_hashfun(daddr); |
622 | ||
623 | write_seqlock_bh(&fnhe_seqlock); | |
4895c771 | 624 | |
aee06da6 | 625 | hash = nh->nh_exceptions; |
4895c771 | 626 | if (!hash) { |
aee06da6 | 627 | hash = kzalloc(FNHE_HASH_SIZE * sizeof(*hash), GFP_ATOMIC); |
4895c771 | 628 | if (!hash) |
aee06da6 JA |
629 | goto out_unlock; |
630 | nh->nh_exceptions = hash; | |
4895c771 DM |
631 | } |
632 | ||
4895c771 DM |
633 | hash += hval; |
634 | ||
635 | depth = 0; | |
636 | for (fnhe = rcu_dereference(hash->chain); fnhe; | |
637 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
638 | if (fnhe->fnhe_daddr == daddr) | |
aee06da6 | 639 | break; |
4895c771 DM |
640 | depth++; |
641 | } | |
642 | ||
aee06da6 JA |
643 | if (fnhe) { |
644 | if (gw) | |
645 | fnhe->fnhe_gw = gw; | |
646 | if (pmtu) { | |
647 | fnhe->fnhe_pmtu = pmtu; | |
648 | fnhe->fnhe_expires = expires; | |
649 | } | |
650 | } else { | |
651 | if (depth > FNHE_RECLAIM_DEPTH) | |
652 | fnhe = fnhe_oldest(hash); | |
653 | else { | |
654 | fnhe = kzalloc(sizeof(*fnhe), GFP_ATOMIC); | |
655 | if (!fnhe) | |
656 | goto out_unlock; | |
657 | ||
658 | fnhe->fnhe_next = hash->chain; | |
659 | rcu_assign_pointer(hash->chain, fnhe); | |
660 | } | |
661 | fnhe->fnhe_daddr = daddr; | |
662 | fnhe->fnhe_gw = gw; | |
663 | fnhe->fnhe_pmtu = pmtu; | |
664 | fnhe->fnhe_expires = expires; | |
4895c771 | 665 | } |
4895c771 | 666 | |
4895c771 | 667 | fnhe->fnhe_stamp = jiffies; |
aee06da6 JA |
668 | |
669 | out_unlock: | |
670 | write_sequnlock_bh(&fnhe_seqlock); | |
671 | return; | |
4895c771 DM |
672 | } |
673 | ||
ceb33206 DM |
674 | static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flowi4 *fl4, |
675 | bool kill_route) | |
1da177e4 | 676 | { |
e47a185b | 677 | __be32 new_gw = icmp_hdr(skb)->un.gateway; |
94206125 | 678 | __be32 old_gw = ip_hdr(skb)->saddr; |
e47a185b | 679 | struct net_device *dev = skb->dev; |
e47a185b | 680 | struct in_device *in_dev; |
4895c771 | 681 | struct fib_result res; |
e47a185b | 682 | struct neighbour *n; |
317805b8 | 683 | struct net *net; |
1da177e4 | 684 | |
94206125 DM |
685 | switch (icmp_hdr(skb)->code & 7) { |
686 | case ICMP_REDIR_NET: | |
687 | case ICMP_REDIR_NETTOS: | |
688 | case ICMP_REDIR_HOST: | |
689 | case ICMP_REDIR_HOSTTOS: | |
690 | break; | |
691 | ||
692 | default: | |
693 | return; | |
694 | } | |
695 | ||
e47a185b DM |
696 | if (rt->rt_gateway != old_gw) |
697 | return; | |
698 | ||
699 | in_dev = __in_dev_get_rcu(dev); | |
700 | if (!in_dev) | |
701 | return; | |
702 | ||
c346dca1 | 703 | net = dev_net(dev); |
9d4fb27d JP |
704 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) || |
705 | ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) || | |
706 | ipv4_is_zeronet(new_gw)) | |
1da177e4 LT |
707 | goto reject_redirect; |
708 | ||
709 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { | |
710 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) | |
711 | goto reject_redirect; | |
712 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) | |
713 | goto reject_redirect; | |
714 | } else { | |
317805b8 | 715 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
1da177e4 LT |
716 | goto reject_redirect; |
717 | } | |
718 | ||
4895c771 | 719 | n = ipv4_neigh_lookup(&rt->dst, NULL, &new_gw); |
e47a185b DM |
720 | if (n) { |
721 | if (!(n->nud_state & NUD_VALID)) { | |
722 | neigh_event_send(n, NULL); | |
723 | } else { | |
4895c771 DM |
724 | if (fib_lookup(net, fl4, &res) == 0) { |
725 | struct fib_nh *nh = &FIB_RES_NH(res); | |
4895c771 | 726 | |
aee06da6 JA |
727 | update_or_create_fnhe(nh, fl4->daddr, new_gw, |
728 | 0, 0); | |
4895c771 | 729 | } |
ceb33206 DM |
730 | if (kill_route) |
731 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
e47a185b DM |
732 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n); |
733 | } | |
734 | neigh_release(n); | |
735 | } | |
736 | return; | |
737 | ||
738 | reject_redirect: | |
739 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
99ee038d DM |
740 | if (IN_DEV_LOG_MARTIANS(in_dev)) { |
741 | const struct iphdr *iph = (const struct iphdr *) skb->data; | |
742 | __be32 daddr = iph->daddr; | |
743 | __be32 saddr = iph->saddr; | |
744 | ||
e47a185b DM |
745 | net_info_ratelimited("Redirect from %pI4 on %s about %pI4 ignored\n" |
746 | " Advised path = %pI4 -> %pI4\n", | |
747 | &old_gw, dev->name, &new_gw, | |
748 | &saddr, &daddr); | |
99ee038d | 749 | } |
e47a185b DM |
750 | #endif |
751 | ; | |
752 | } | |
753 | ||
4895c771 DM |
754 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
755 | { | |
756 | struct rtable *rt; | |
757 | struct flowi4 fl4; | |
758 | ||
759 | rt = (struct rtable *) dst; | |
760 | ||
761 | ip_rt_build_flow_key(&fl4, sk, skb); | |
ceb33206 | 762 | __ip_do_redirect(rt, skb, &fl4, true); |
4895c771 DM |
763 | } |
764 | ||
1da177e4 LT |
765 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) |
766 | { | |
ee6b9673 | 767 | struct rtable *rt = (struct rtable *)dst; |
1da177e4 LT |
768 | struct dst_entry *ret = dst; |
769 | ||
770 | if (rt) { | |
d11a4dc1 | 771 | if (dst->obsolete > 0) { |
1da177e4 LT |
772 | ip_rt_put(rt); |
773 | ret = NULL; | |
5943634f DM |
774 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || |
775 | rt->dst.expires) { | |
89aef892 | 776 | ip_rt_put(rt); |
1da177e4 LT |
777 | ret = NULL; |
778 | } | |
779 | } | |
780 | return ret; | |
781 | } | |
782 | ||
783 | /* | |
784 | * Algorithm: | |
785 | * 1. The first ip_rt_redirect_number redirects are sent | |
786 | * with exponential backoff, then we stop sending them at all, | |
787 | * assuming that the host ignores our redirects. | |
788 | * 2. If we did not see packets requiring redirects | |
789 | * during ip_rt_redirect_silence, we assume that the host | |
790 | * forgot redirected route and start to send redirects again. | |
791 | * | |
792 | * This algorithm is much cheaper and more intelligent than dumb load limiting | |
793 | * in icmp.c. | |
794 | * | |
795 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) | |
796 | * and "frag. need" (breaks PMTU discovery) in icmp.c. | |
797 | */ | |
798 | ||
799 | void ip_rt_send_redirect(struct sk_buff *skb) | |
800 | { | |
511c3f92 | 801 | struct rtable *rt = skb_rtable(skb); |
30038fc6 | 802 | struct in_device *in_dev; |
92d86829 | 803 | struct inet_peer *peer; |
1d861aa4 | 804 | struct net *net; |
30038fc6 | 805 | int log_martians; |
1da177e4 | 806 | |
30038fc6 | 807 | rcu_read_lock(); |
d8d1f30b | 808 | in_dev = __in_dev_get_rcu(rt->dst.dev); |
30038fc6 ED |
809 | if (!in_dev || !IN_DEV_TX_REDIRECTS(in_dev)) { |
810 | rcu_read_unlock(); | |
1da177e4 | 811 | return; |
30038fc6 ED |
812 | } |
813 | log_martians = IN_DEV_LOG_MARTIANS(in_dev); | |
814 | rcu_read_unlock(); | |
1da177e4 | 815 | |
1d861aa4 DM |
816 | net = dev_net(rt->dst.dev); |
817 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, 1); | |
92d86829 DM |
818 | if (!peer) { |
819 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); | |
820 | return; | |
821 | } | |
822 | ||
1da177e4 LT |
823 | /* No redirected packets during ip_rt_redirect_silence; |
824 | * reset the algorithm. | |
825 | */ | |
92d86829 DM |
826 | if (time_after(jiffies, peer->rate_last + ip_rt_redirect_silence)) |
827 | peer->rate_tokens = 0; | |
1da177e4 LT |
828 | |
829 | /* Too many ignored redirects; do not send anything | |
d8d1f30b | 830 | * set dst.rate_last to the last seen redirected packet. |
1da177e4 | 831 | */ |
92d86829 DM |
832 | if (peer->rate_tokens >= ip_rt_redirect_number) { |
833 | peer->rate_last = jiffies; | |
1d861aa4 | 834 | goto out_put_peer; |
1da177e4 LT |
835 | } |
836 | ||
837 | /* Check for load limit; set rate_last to the latest sent | |
838 | * redirect. | |
839 | */ | |
92d86829 | 840 | if (peer->rate_tokens == 0 || |
14fb8a76 | 841 | time_after(jiffies, |
92d86829 DM |
842 | (peer->rate_last + |
843 | (ip_rt_redirect_load << peer->rate_tokens)))) { | |
1da177e4 | 844 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); |
92d86829 DM |
845 | peer->rate_last = jiffies; |
846 | ++peer->rate_tokens; | |
1da177e4 | 847 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
30038fc6 | 848 | if (log_martians && |
e87cc472 JP |
849 | peer->rate_tokens == ip_rt_redirect_number) |
850 | net_warn_ratelimited("host %pI4/if%d ignores redirects for %pI4 to %pI4\n", | |
851 | &ip_hdr(skb)->saddr, rt->rt_iif, | |
f1ce3062 | 852 | &ip_hdr(skb)->daddr, &rt->rt_gateway); |
1da177e4 LT |
853 | #endif |
854 | } | |
1d861aa4 DM |
855 | out_put_peer: |
856 | inet_putpeer(peer); | |
1da177e4 LT |
857 | } |
858 | ||
859 | static int ip_error(struct sk_buff *skb) | |
860 | { | |
251da413 | 861 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
511c3f92 | 862 | struct rtable *rt = skb_rtable(skb); |
92d86829 | 863 | struct inet_peer *peer; |
1da177e4 | 864 | unsigned long now; |
251da413 | 865 | struct net *net; |
92d86829 | 866 | bool send; |
1da177e4 LT |
867 | int code; |
868 | ||
251da413 DM |
869 | net = dev_net(rt->dst.dev); |
870 | if (!IN_DEV_FORWARD(in_dev)) { | |
871 | switch (rt->dst.error) { | |
872 | case EHOSTUNREACH: | |
873 | IP_INC_STATS_BH(net, IPSTATS_MIB_INADDRERRORS); | |
874 | break; | |
875 | ||
876 | case ENETUNREACH: | |
877 | IP_INC_STATS_BH(net, IPSTATS_MIB_INNOROUTES); | |
878 | break; | |
879 | } | |
880 | goto out; | |
881 | } | |
882 | ||
d8d1f30b | 883 | switch (rt->dst.error) { |
4500ebf8 JP |
884 | case EINVAL: |
885 | default: | |
886 | goto out; | |
887 | case EHOSTUNREACH: | |
888 | code = ICMP_HOST_UNREACH; | |
889 | break; | |
890 | case ENETUNREACH: | |
891 | code = ICMP_NET_UNREACH; | |
251da413 | 892 | IP_INC_STATS_BH(net, IPSTATS_MIB_INNOROUTES); |
4500ebf8 JP |
893 | break; |
894 | case EACCES: | |
895 | code = ICMP_PKT_FILTERED; | |
896 | break; | |
1da177e4 LT |
897 | } |
898 | ||
1d861aa4 | 899 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, 1); |
92d86829 DM |
900 | |
901 | send = true; | |
902 | if (peer) { | |
903 | now = jiffies; | |
904 | peer->rate_tokens += now - peer->rate_last; | |
905 | if (peer->rate_tokens > ip_rt_error_burst) | |
906 | peer->rate_tokens = ip_rt_error_burst; | |
907 | peer->rate_last = now; | |
908 | if (peer->rate_tokens >= ip_rt_error_cost) | |
909 | peer->rate_tokens -= ip_rt_error_cost; | |
910 | else | |
911 | send = false; | |
1d861aa4 | 912 | inet_putpeer(peer); |
1da177e4 | 913 | } |
92d86829 DM |
914 | if (send) |
915 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); | |
1da177e4 LT |
916 | |
917 | out: kfree_skb(skb); | |
918 | return 0; | |
e905a9ed | 919 | } |
1da177e4 | 920 | |
ceb33206 | 921 | static u32 __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu) |
1da177e4 | 922 | { |
4895c771 | 923 | struct fib_result res; |
2c8cec5c | 924 | |
5943634f DM |
925 | if (mtu < ip_rt_min_pmtu) |
926 | mtu = ip_rt_min_pmtu; | |
2c8cec5c | 927 | |
4895c771 DM |
928 | if (fib_lookup(dev_net(rt->dst.dev), fl4, &res) == 0) { |
929 | struct fib_nh *nh = &FIB_RES_NH(res); | |
4895c771 | 930 | |
aee06da6 JA |
931 | update_or_create_fnhe(nh, fl4->daddr, 0, mtu, |
932 | jiffies + ip_rt_mtu_expires); | |
4895c771 | 933 | } |
ceb33206 | 934 | return mtu; |
1da177e4 LT |
935 | } |
936 | ||
4895c771 DM |
937 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
938 | struct sk_buff *skb, u32 mtu) | |
939 | { | |
940 | struct rtable *rt = (struct rtable *) dst; | |
941 | struct flowi4 fl4; | |
942 | ||
943 | ip_rt_build_flow_key(&fl4, sk, skb); | |
ceb33206 DM |
944 | mtu = __ip_rt_update_pmtu(rt, &fl4, mtu); |
945 | ||
946 | if (!rt->rt_pmtu) { | |
947 | dst->obsolete = DST_OBSOLETE_KILL; | |
948 | } else { | |
949 | rt->rt_pmtu = mtu; | |
950 | dst_set_expires(&rt->dst, ip_rt_mtu_expires); | |
951 | } | |
4895c771 DM |
952 | } |
953 | ||
36393395 DM |
954 | void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, |
955 | int oif, u32 mark, u8 protocol, int flow_flags) | |
956 | { | |
4895c771 | 957 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
36393395 DM |
958 | struct flowi4 fl4; |
959 | struct rtable *rt; | |
960 | ||
4895c771 DM |
961 | __build_flow_key(&fl4, NULL, iph, oif, |
962 | RT_TOS(iph->tos), protocol, mark, flow_flags); | |
36393395 DM |
963 | rt = __ip_route_output_key(net, &fl4); |
964 | if (!IS_ERR(rt)) { | |
4895c771 | 965 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
36393395 DM |
966 | ip_rt_put(rt); |
967 | } | |
968 | } | |
969 | EXPORT_SYMBOL_GPL(ipv4_update_pmtu); | |
970 | ||
971 | void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) | |
972 | { | |
4895c771 DM |
973 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
974 | struct flowi4 fl4; | |
975 | struct rtable *rt; | |
36393395 | 976 | |
4895c771 DM |
977 | __build_flow_key(&fl4, sk, iph, 0, 0, 0, 0, 0); |
978 | rt = __ip_route_output_key(sock_net(sk), &fl4); | |
979 | if (!IS_ERR(rt)) { | |
980 | __ip_rt_update_pmtu(rt, &fl4, mtu); | |
981 | ip_rt_put(rt); | |
982 | } | |
36393395 DM |
983 | } |
984 | EXPORT_SYMBOL_GPL(ipv4_sk_update_pmtu); | |
f39925db | 985 | |
b42597e2 DM |
986 | void ipv4_redirect(struct sk_buff *skb, struct net *net, |
987 | int oif, u32 mark, u8 protocol, int flow_flags) | |
988 | { | |
4895c771 | 989 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
b42597e2 DM |
990 | struct flowi4 fl4; |
991 | struct rtable *rt; | |
992 | ||
4895c771 DM |
993 | __build_flow_key(&fl4, NULL, iph, oif, |
994 | RT_TOS(iph->tos), protocol, mark, flow_flags); | |
b42597e2 DM |
995 | rt = __ip_route_output_key(net, &fl4); |
996 | if (!IS_ERR(rt)) { | |
ceb33206 | 997 | __ip_do_redirect(rt, skb, &fl4, false); |
b42597e2 DM |
998 | ip_rt_put(rt); |
999 | } | |
1000 | } | |
1001 | EXPORT_SYMBOL_GPL(ipv4_redirect); | |
1002 | ||
1003 | void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk) | |
1004 | { | |
4895c771 DM |
1005 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
1006 | struct flowi4 fl4; | |
1007 | struct rtable *rt; | |
b42597e2 | 1008 | |
4895c771 DM |
1009 | __build_flow_key(&fl4, sk, iph, 0, 0, 0, 0, 0); |
1010 | rt = __ip_route_output_key(sock_net(sk), &fl4); | |
1011 | if (!IS_ERR(rt)) { | |
ceb33206 | 1012 | __ip_do_redirect(rt, skb, &fl4, false); |
4895c771 DM |
1013 | ip_rt_put(rt); |
1014 | } | |
b42597e2 DM |
1015 | } |
1016 | EXPORT_SYMBOL_GPL(ipv4_sk_redirect); | |
1017 | ||
efbc368d DM |
1018 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) |
1019 | { | |
1020 | struct rtable *rt = (struct rtable *) dst; | |
1021 | ||
ceb33206 DM |
1022 | /* All IPV4 dsts are created with ->obsolete set to the value |
1023 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1024 | * into this function always. | |
1025 | * | |
1026 | * When a PMTU/redirect information update invalidates a | |
1027 | * route, this is indicated by setting obsolete to | |
1028 | * DST_OBSOLETE_KILL. | |
1029 | */ | |
1030 | if (dst->obsolete == DST_OBSOLETE_KILL || rt_is_expired(rt)) | |
efbc368d | 1031 | return NULL; |
d11a4dc1 | 1032 | return dst; |
1da177e4 LT |
1033 | } |
1034 | ||
1da177e4 LT |
1035 | static void ipv4_link_failure(struct sk_buff *skb) |
1036 | { | |
1037 | struct rtable *rt; | |
1038 | ||
1039 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); | |
1040 | ||
511c3f92 | 1041 | rt = skb_rtable(skb); |
5943634f DM |
1042 | if (rt) |
1043 | dst_set_expires(&rt->dst, 0); | |
1da177e4 LT |
1044 | } |
1045 | ||
1046 | static int ip_rt_bug(struct sk_buff *skb) | |
1047 | { | |
91df42be JP |
1048 | pr_debug("%s: %pI4 -> %pI4, %s\n", |
1049 | __func__, &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, | |
1050 | skb->dev ? skb->dev->name : "?"); | |
1da177e4 | 1051 | kfree_skb(skb); |
c378a9c0 | 1052 | WARN_ON(1); |
1da177e4 LT |
1053 | return 0; |
1054 | } | |
1055 | ||
1056 | /* | |
1057 | We do not cache source address of outgoing interface, | |
1058 | because it is used only by IP RR, TS and SRR options, | |
1059 | so that it out of fast path. | |
1060 | ||
1061 | BTW remember: "addr" is allowed to be not aligned | |
1062 | in IP options! | |
1063 | */ | |
1064 | ||
8e36360a | 1065 | void ip_rt_get_source(u8 *addr, struct sk_buff *skb, struct rtable *rt) |
1da177e4 | 1066 | { |
a61ced5d | 1067 | __be32 src; |
1da177e4 | 1068 | |
c7537967 | 1069 | if (rt_is_output_route(rt)) |
c5be24ff | 1070 | src = ip_hdr(skb)->saddr; |
ebc0ffae | 1071 | else { |
8e36360a DM |
1072 | struct fib_result res; |
1073 | struct flowi4 fl4; | |
1074 | struct iphdr *iph; | |
1075 | ||
1076 | iph = ip_hdr(skb); | |
1077 | ||
1078 | memset(&fl4, 0, sizeof(fl4)); | |
1079 | fl4.daddr = iph->daddr; | |
1080 | fl4.saddr = iph->saddr; | |
b0fe4a31 | 1081 | fl4.flowi4_tos = RT_TOS(iph->tos); |
8e36360a DM |
1082 | fl4.flowi4_oif = rt->dst.dev->ifindex; |
1083 | fl4.flowi4_iif = skb->dev->ifindex; | |
1084 | fl4.flowi4_mark = skb->mark; | |
5e2b61f7 | 1085 | |
ebc0ffae | 1086 | rcu_read_lock(); |
68a5e3dd | 1087 | if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res) == 0) |
436c3b66 | 1088 | src = FIB_RES_PREFSRC(dev_net(rt->dst.dev), res); |
ebc0ffae | 1089 | else |
f8126f1d DM |
1090 | src = inet_select_addr(rt->dst.dev, |
1091 | rt_nexthop(rt, iph->daddr), | |
1092 | RT_SCOPE_UNIVERSE); | |
ebc0ffae ED |
1093 | rcu_read_unlock(); |
1094 | } | |
1da177e4 LT |
1095 | memcpy(addr, &src, 4); |
1096 | } | |
1097 | ||
c7066f70 | 1098 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
1099 | static void set_class_tag(struct rtable *rt, u32 tag) |
1100 | { | |
d8d1f30b CG |
1101 | if (!(rt->dst.tclassid & 0xFFFF)) |
1102 | rt->dst.tclassid |= tag & 0xFFFF; | |
1103 | if (!(rt->dst.tclassid & 0xFFFF0000)) | |
1104 | rt->dst.tclassid |= tag & 0xFFFF0000; | |
1da177e4 LT |
1105 | } |
1106 | #endif | |
1107 | ||
0dbaee3b DM |
1108 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst) |
1109 | { | |
1110 | unsigned int advmss = dst_metric_raw(dst, RTAX_ADVMSS); | |
1111 | ||
1112 | if (advmss == 0) { | |
1113 | advmss = max_t(unsigned int, dst->dev->mtu - 40, | |
1114 | ip_rt_min_advmss); | |
1115 | if (advmss > 65535 - 40) | |
1116 | advmss = 65535 - 40; | |
1117 | } | |
1118 | return advmss; | |
1119 | } | |
1120 | ||
ebb762f2 | 1121 | static unsigned int ipv4_mtu(const struct dst_entry *dst) |
d33e4553 | 1122 | { |
261663b0 | 1123 | const struct rtable *rt = (const struct rtable *) dst; |
5943634f DM |
1124 | unsigned int mtu = rt->rt_pmtu; |
1125 | ||
1126 | if (mtu && time_after_eq(jiffies, rt->dst.expires)) | |
1127 | mtu = 0; | |
1128 | ||
1129 | if (!mtu) | |
1130 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
618f9bc7 | 1131 | |
261663b0 | 1132 | if (mtu && rt_is_output_route(rt)) |
618f9bc7 SK |
1133 | return mtu; |
1134 | ||
1135 | mtu = dst->dev->mtu; | |
d33e4553 DM |
1136 | |
1137 | if (unlikely(dst_metric_locked(dst, RTAX_MTU))) { | |
f8126f1d | 1138 | if (rt->rt_gateway && mtu > 576) |
d33e4553 DM |
1139 | mtu = 576; |
1140 | } | |
1141 | ||
1142 | if (mtu > IP_MAX_MTU) | |
1143 | mtu = IP_MAX_MTU; | |
1144 | ||
1145 | return mtu; | |
1146 | } | |
1147 | ||
f2bb4bed | 1148 | static struct fib_nh_exception *find_exception(struct fib_nh *nh, __be32 daddr) |
4895c771 DM |
1149 | { |
1150 | struct fnhe_hash_bucket *hash = nh->nh_exceptions; | |
1151 | struct fib_nh_exception *fnhe; | |
1152 | u32 hval; | |
1153 | ||
f2bb4bed DM |
1154 | if (!hash) |
1155 | return NULL; | |
1156 | ||
d3a25c98 | 1157 | hval = fnhe_hashfun(daddr); |
4895c771 DM |
1158 | |
1159 | for (fnhe = rcu_dereference(hash[hval].chain); fnhe; | |
1160 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
f2bb4bed DM |
1161 | if (fnhe->fnhe_daddr == daddr) |
1162 | return fnhe; | |
1163 | } | |
1164 | return NULL; | |
1165 | } | |
aee06da6 | 1166 | |
f2bb4bed DM |
1167 | static void rt_bind_exception(struct rtable *rt, struct fib_nh_exception *fnhe, |
1168 | __be32 daddr) | |
1169 | { | |
1170 | __be32 fnhe_daddr, gw; | |
1171 | unsigned long expires; | |
1172 | unsigned int seq; | |
1173 | u32 pmtu; | |
1174 | ||
1175 | restart: | |
1176 | seq = read_seqbegin(&fnhe_seqlock); | |
1177 | fnhe_daddr = fnhe->fnhe_daddr; | |
1178 | gw = fnhe->fnhe_gw; | |
1179 | pmtu = fnhe->fnhe_pmtu; | |
1180 | expires = fnhe->fnhe_expires; | |
1181 | if (read_seqretry(&fnhe_seqlock, seq)) | |
1182 | goto restart; | |
1183 | ||
1184 | if (daddr != fnhe_daddr) | |
1185 | return; | |
1186 | ||
1187 | if (pmtu) { | |
1188 | unsigned long diff = expires - jiffies; | |
1189 | ||
1190 | if (time_before(jiffies, expires)) { | |
1191 | rt->rt_pmtu = pmtu; | |
1192 | dst_set_expires(&rt->dst, diff); | |
ceb33206 | 1193 | } |
f2bb4bed DM |
1194 | } |
1195 | if (gw) { | |
1196 | rt->rt_flags |= RTCF_REDIRECTED; | |
1197 | rt->rt_gateway = gw; | |
1198 | } | |
1199 | fnhe->fnhe_stamp = jiffies; | |
1200 | } | |
1201 | ||
1202 | static inline void rt_release_rcu(struct rcu_head *head) | |
1203 | { | |
1204 | struct dst_entry *dst = container_of(head, struct dst_entry, rcu_head); | |
1205 | dst_release(dst); | |
1206 | } | |
1207 | ||
1208 | static void rt_cache_route(struct fib_nh *nh, struct rtable *rt) | |
1209 | { | |
1210 | struct rtable *orig, *prev, **p = &nh->nh_rth_output; | |
1211 | ||
d2d68ba9 DM |
1212 | if (rt_is_input_route(rt)) |
1213 | p = &nh->nh_rth_input; | |
1214 | ||
f2bb4bed DM |
1215 | orig = *p; |
1216 | ||
1217 | prev = cmpxchg(p, orig, rt); | |
1218 | if (prev == orig) { | |
1219 | dst_clone(&rt->dst); | |
1220 | if (orig) | |
1221 | call_rcu_bh(&orig->dst.rcu_head, rt_release_rcu); | |
4895c771 DM |
1222 | } |
1223 | } | |
1224 | ||
d2d68ba9 DM |
1225 | static bool rt_cache_valid(struct rtable *rt) |
1226 | { | |
1227 | return (rt && rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK); | |
1228 | } | |
1229 | ||
f2bb4bed | 1230 | static void rt_set_nexthop(struct rtable *rt, __be32 daddr, |
5e2b61f7 | 1231 | const struct fib_result *res, |
f2bb4bed | 1232 | struct fib_nh_exception *fnhe, |
982721f3 | 1233 | struct fib_info *fi, u16 type, u32 itag) |
1da177e4 | 1234 | { |
1da177e4 | 1235 | if (fi) { |
4895c771 DM |
1236 | struct fib_nh *nh = &FIB_RES_NH(*res); |
1237 | ||
1238 | if (nh->nh_gw && nh->nh_scope == RT_SCOPE_LINK) | |
1239 | rt->rt_gateway = nh->nh_gw; | |
f2bb4bed DM |
1240 | if (unlikely(fnhe)) |
1241 | rt_bind_exception(rt, fnhe, daddr); | |
2860583f | 1242 | dst_init_metrics(&rt->dst, fi->fib_metrics, true); |
c7066f70 | 1243 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f2bb4bed | 1244 | rt->dst.tclassid = nh->nh_tclassid; |
1da177e4 | 1245 | #endif |
d2d68ba9 | 1246 | if (!(rt->dst.flags & DST_HOST)) |
f2bb4bed | 1247 | rt_cache_route(nh, rt); |
d33e4553 | 1248 | } |
defb3519 | 1249 | |
c7066f70 | 1250 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 | 1251 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
85b91b03 | 1252 | set_class_tag(rt, res->tclassid); |
1da177e4 LT |
1253 | #endif |
1254 | set_class_tag(rt, itag); | |
1255 | #endif | |
1da177e4 LT |
1256 | } |
1257 | ||
5c1e6aa3 | 1258 | static struct rtable *rt_dst_alloc(struct net_device *dev, |
f2bb4bed | 1259 | bool nopolicy, bool noxfrm, bool will_cache) |
0c4dcd58 | 1260 | { |
f5b0a874 | 1261 | return dst_alloc(&ipv4_dst_ops, dev, 1, DST_OBSOLETE_FORCE_CHK, |
f2bb4bed | 1262 | (will_cache ? 0 : DST_HOST) | DST_NOCACHE | |
5c1e6aa3 DM |
1263 | (nopolicy ? DST_NOPOLICY : 0) | |
1264 | (noxfrm ? DST_NOXFRM : 0)); | |
0c4dcd58 DM |
1265 | } |
1266 | ||
96d36220 | 1267 | /* called in rcu_read_lock() section */ |
9e12bb22 | 1268 | static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
1269 | u8 tos, struct net_device *dev, int our) |
1270 | { | |
1da177e4 | 1271 | struct rtable *rth; |
96d36220 | 1272 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
1da177e4 | 1273 | u32 itag = 0; |
b5f7e755 | 1274 | int err; |
1da177e4 LT |
1275 | |
1276 | /* Primary sanity checks. */ | |
1277 | ||
1278 | if (in_dev == NULL) | |
1279 | return -EINVAL; | |
1280 | ||
1e637c74 | 1281 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
d0daebc3 | 1282 | skb->protocol != htons(ETH_P_IP)) |
1da177e4 LT |
1283 | goto e_inval; |
1284 | ||
d0daebc3 TG |
1285 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) |
1286 | if (ipv4_is_loopback(saddr)) | |
1287 | goto e_inval; | |
1288 | ||
f97c1e0c JP |
1289 | if (ipv4_is_zeronet(saddr)) { |
1290 | if (!ipv4_is_local_multicast(daddr)) | |
1da177e4 | 1291 | goto e_inval; |
b5f7e755 | 1292 | } else { |
9e56e380 DM |
1293 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
1294 | in_dev, &itag); | |
b5f7e755 ED |
1295 | if (err < 0) |
1296 | goto e_err; | |
1297 | } | |
4e7b2f14 | 1298 | rth = rt_dst_alloc(dev_net(dev)->loopback_dev, |
f2bb4bed | 1299 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false, false); |
1da177e4 LT |
1300 | if (!rth) |
1301 | goto e_nobufs; | |
1302 | ||
cf911662 DM |
1303 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1304 | rth->dst.tclassid = itag; | |
1305 | #endif | |
d8d1f30b | 1306 | rth->dst.output = ip_rt_bug; |
1da177e4 | 1307 | |
cf911662 DM |
1308 | rth->rt_genid = rt_genid(dev_net(dev)); |
1309 | rth->rt_flags = RTCF_MULTICAST; | |
1310 | rth->rt_type = RTN_MULTICAST; | |
9917e1e8 | 1311 | rth->rt_is_input= 1; |
5e2b61f7 | 1312 | rth->rt_iif = dev->ifindex; |
5943634f | 1313 | rth->rt_pmtu = 0; |
f8126f1d | 1314 | rth->rt_gateway = 0; |
1da177e4 | 1315 | if (our) { |
d8d1f30b | 1316 | rth->dst.input= ip_local_deliver; |
1da177e4 LT |
1317 | rth->rt_flags |= RTCF_LOCAL; |
1318 | } | |
1319 | ||
1320 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c | 1321 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
d8d1f30b | 1322 | rth->dst.input = ip_mr_input; |
1da177e4 LT |
1323 | #endif |
1324 | RT_CACHE_STAT_INC(in_slow_mc); | |
1325 | ||
89aef892 DM |
1326 | skb_dst_set(skb, &rth->dst); |
1327 | return 0; | |
1da177e4 LT |
1328 | |
1329 | e_nobufs: | |
1da177e4 | 1330 | return -ENOBUFS; |
1da177e4 | 1331 | e_inval: |
96d36220 | 1332 | return -EINVAL; |
b5f7e755 | 1333 | e_err: |
b5f7e755 | 1334 | return err; |
1da177e4 LT |
1335 | } |
1336 | ||
1337 | ||
1338 | static void ip_handle_martian_source(struct net_device *dev, | |
1339 | struct in_device *in_dev, | |
1340 | struct sk_buff *skb, | |
9e12bb22 AV |
1341 | __be32 daddr, |
1342 | __be32 saddr) | |
1da177e4 LT |
1343 | { |
1344 | RT_CACHE_STAT_INC(in_martian_src); | |
1345 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1346 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { | |
1347 | /* | |
1348 | * RFC1812 recommendation, if source is martian, | |
1349 | * the only hint is MAC header. | |
1350 | */ | |
058bd4d2 | 1351 | pr_warn("martian source %pI4 from %pI4, on dev %s\n", |
673d57e7 | 1352 | &daddr, &saddr, dev->name); |
98e399f8 | 1353 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
058bd4d2 JP |
1354 | print_hex_dump(KERN_WARNING, "ll header: ", |
1355 | DUMP_PREFIX_OFFSET, 16, 1, | |
1356 | skb_mac_header(skb), | |
1357 | dev->hard_header_len, true); | |
1da177e4 LT |
1358 | } |
1359 | } | |
1360 | #endif | |
1361 | } | |
1362 | ||
47360228 | 1363 | /* called in rcu_read_lock() section */ |
5969f71d | 1364 | static int __mkroute_input(struct sk_buff *skb, |
982721f3 | 1365 | const struct fib_result *res, |
5969f71d SH |
1366 | struct in_device *in_dev, |
1367 | __be32 daddr, __be32 saddr, u32 tos, | |
1368 | struct rtable **result) | |
1da177e4 | 1369 | { |
1da177e4 LT |
1370 | struct rtable *rth; |
1371 | int err; | |
1372 | struct in_device *out_dev; | |
47360228 | 1373 | unsigned int flags = 0; |
d2d68ba9 | 1374 | bool do_cache; |
d9c9df8c | 1375 | u32 itag; |
1da177e4 LT |
1376 | |
1377 | /* get a working reference to the output device */ | |
47360228 | 1378 | out_dev = __in_dev_get_rcu(FIB_RES_DEV(*res)); |
1da177e4 | 1379 | if (out_dev == NULL) { |
e87cc472 | 1380 | net_crit_ratelimited("Bug in ip_route_input_slow(). Please report.\n"); |
1da177e4 LT |
1381 | return -EINVAL; |
1382 | } | |
1383 | ||
1384 | ||
5c04c819 | 1385 | err = fib_validate_source(skb, saddr, daddr, tos, FIB_RES_OIF(*res), |
9e56e380 | 1386 | in_dev->dev, in_dev, &itag); |
1da177e4 | 1387 | if (err < 0) { |
e905a9ed | 1388 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
1da177e4 | 1389 | saddr); |
e905a9ed | 1390 | |
1da177e4 LT |
1391 | goto cleanup; |
1392 | } | |
1393 | ||
1394 | if (err) | |
1395 | flags |= RTCF_DIRECTSRC; | |
1396 | ||
51b77cae | 1397 | if (out_dev == in_dev && err && |
1da177e4 LT |
1398 | (IN_DEV_SHARED_MEDIA(out_dev) || |
1399 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) | |
1400 | flags |= RTCF_DOREDIRECT; | |
1401 | ||
1402 | if (skb->protocol != htons(ETH_P_IP)) { | |
1403 | /* Not IP (i.e. ARP). Do not create route, if it is | |
1404 | * invalid for proxy arp. DNAT routes are always valid. | |
65324144 JDB |
1405 | * |
1406 | * Proxy arp feature have been extended to allow, ARP | |
1407 | * replies back to the same interface, to support | |
1408 | * Private VLAN switch technologies. See arp.c. | |
1da177e4 | 1409 | */ |
65324144 JDB |
1410 | if (out_dev == in_dev && |
1411 | IN_DEV_PROXY_ARP_PVLAN(in_dev) == 0) { | |
1da177e4 LT |
1412 | err = -EINVAL; |
1413 | goto cleanup; | |
1414 | } | |
1415 | } | |
1416 | ||
d2d68ba9 DM |
1417 | do_cache = false; |
1418 | if (res->fi) { | |
1419 | if (!(flags & RTCF_DIRECTSRC) && !itag) { | |
1420 | rth = FIB_RES_NH(*res).nh_rth_input; | |
1421 | if (rt_cache_valid(rth)) { | |
93ac5341 | 1422 | dst_hold(&rth->dst); |
d2d68ba9 DM |
1423 | goto out; |
1424 | } | |
1425 | do_cache = true; | |
1426 | } | |
1427 | } | |
f2bb4bed | 1428 | |
5c1e6aa3 DM |
1429 | rth = rt_dst_alloc(out_dev->dev, |
1430 | IN_DEV_CONF_GET(in_dev, NOPOLICY), | |
d2d68ba9 | 1431 | IN_DEV_CONF_GET(out_dev, NOXFRM), do_cache); |
1da177e4 LT |
1432 | if (!rth) { |
1433 | err = -ENOBUFS; | |
1434 | goto cleanup; | |
1435 | } | |
1436 | ||
cf911662 DM |
1437 | rth->rt_genid = rt_genid(dev_net(rth->dst.dev)); |
1438 | rth->rt_flags = flags; | |
1439 | rth->rt_type = res->type; | |
9917e1e8 | 1440 | rth->rt_is_input = 1; |
5e2b61f7 | 1441 | rth->rt_iif = in_dev->dev->ifindex; |
5943634f | 1442 | rth->rt_pmtu = 0; |
f8126f1d | 1443 | rth->rt_gateway = 0; |
1da177e4 | 1444 | |
d8d1f30b CG |
1445 | rth->dst.input = ip_forward; |
1446 | rth->dst.output = ip_output; | |
1da177e4 | 1447 | |
d2d68ba9 DM |
1448 | rt_set_nexthop(rth, daddr, res, NULL, res->fi, res->type, itag); |
1449 | out: | |
1da177e4 LT |
1450 | *result = rth; |
1451 | err = 0; | |
1452 | cleanup: | |
1da177e4 | 1453 | return err; |
e905a9ed | 1454 | } |
1da177e4 | 1455 | |
5969f71d SH |
1456 | static int ip_mkroute_input(struct sk_buff *skb, |
1457 | struct fib_result *res, | |
68a5e3dd | 1458 | const struct flowi4 *fl4, |
5969f71d SH |
1459 | struct in_device *in_dev, |
1460 | __be32 daddr, __be32 saddr, u32 tos) | |
1da177e4 | 1461 | { |
5e73ea1a | 1462 | struct rtable *rth = NULL; |
1da177e4 | 1463 | int err; |
1da177e4 LT |
1464 | |
1465 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
ff3fccb3 | 1466 | if (res->fi && res->fi->fib_nhs > 1) |
1b7fe593 | 1467 | fib_select_multipath(res); |
1da177e4 LT |
1468 | #endif |
1469 | ||
1470 | /* create a routing cache entry */ | |
1471 | err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth); | |
1472 | if (err) | |
1473 | return err; | |
1da177e4 | 1474 | |
89aef892 | 1475 | skb_dst_set(skb, &rth->dst); |
b23dd4fe | 1476 | return 0; |
1da177e4 LT |
1477 | } |
1478 | ||
1da177e4 LT |
1479 | /* |
1480 | * NOTE. We drop all the packets that has local source | |
1481 | * addresses, because every properly looped back packet | |
1482 | * must have correct destination already attached by output routine. | |
1483 | * | |
1484 | * Such approach solves two big problems: | |
1485 | * 1. Not simplex devices are handled properly. | |
1486 | * 2. IP spoofing attempts are filtered with 100% of guarantee. | |
ebc0ffae | 1487 | * called with rcu_read_lock() |
1da177e4 LT |
1488 | */ |
1489 | ||
9e12bb22 | 1490 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
c10237e0 | 1491 | u8 tos, struct net_device *dev) |
1da177e4 LT |
1492 | { |
1493 | struct fib_result res; | |
96d36220 | 1494 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
68a5e3dd | 1495 | struct flowi4 fl4; |
95c96174 | 1496 | unsigned int flags = 0; |
1da177e4 | 1497 | u32 itag = 0; |
95c96174 | 1498 | struct rtable *rth; |
1da177e4 | 1499 | int err = -EINVAL; |
5e73ea1a | 1500 | struct net *net = dev_net(dev); |
d2d68ba9 | 1501 | bool do_cache; |
1da177e4 LT |
1502 | |
1503 | /* IP on this device is disabled. */ | |
1504 | ||
1505 | if (!in_dev) | |
1506 | goto out; | |
1507 | ||
1508 | /* Check for the most weird martians, which can be not detected | |
1509 | by fib_lookup. | |
1510 | */ | |
1511 | ||
d0daebc3 | 1512 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) |
1da177e4 LT |
1513 | goto martian_source; |
1514 | ||
d2d68ba9 | 1515 | res.fi = NULL; |
27a954bd | 1516 | if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0)) |
1da177e4 LT |
1517 | goto brd_input; |
1518 | ||
1519 | /* Accept zero addresses only to limited broadcast; | |
1520 | * I even do not know to fix it or not. Waiting for complains :-) | |
1521 | */ | |
f97c1e0c | 1522 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
1523 | goto martian_source; |
1524 | ||
d0daebc3 | 1525 | if (ipv4_is_zeronet(daddr)) |
1da177e4 LT |
1526 | goto martian_destination; |
1527 | ||
d0daebc3 TG |
1528 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) { |
1529 | if (ipv4_is_loopback(daddr)) | |
1530 | goto martian_destination; | |
1531 | ||
1532 | if (ipv4_is_loopback(saddr)) | |
1533 | goto martian_source; | |
1534 | } | |
1535 | ||
1da177e4 LT |
1536 | /* |
1537 | * Now we are ready to route packet. | |
1538 | */ | |
68a5e3dd DM |
1539 | fl4.flowi4_oif = 0; |
1540 | fl4.flowi4_iif = dev->ifindex; | |
1541 | fl4.flowi4_mark = skb->mark; | |
1542 | fl4.flowi4_tos = tos; | |
1543 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
1544 | fl4.daddr = daddr; | |
1545 | fl4.saddr = saddr; | |
1546 | err = fib_lookup(net, &fl4, &res); | |
251da413 | 1547 | if (err != 0) |
1da177e4 | 1548 | goto no_route; |
1da177e4 LT |
1549 | |
1550 | RT_CACHE_STAT_INC(in_slow_tot); | |
1551 | ||
1552 | if (res.type == RTN_BROADCAST) | |
1553 | goto brd_input; | |
1554 | ||
1555 | if (res.type == RTN_LOCAL) { | |
5c04c819 | 1556 | err = fib_validate_source(skb, saddr, daddr, tos, |
ebc0ffae | 1557 | net->loopback_dev->ifindex, |
9e56e380 | 1558 | dev, in_dev, &itag); |
b5f7e755 ED |
1559 | if (err < 0) |
1560 | goto martian_source_keep_err; | |
1561 | if (err) | |
1da177e4 | 1562 | flags |= RTCF_DIRECTSRC; |
1da177e4 LT |
1563 | goto local_input; |
1564 | } | |
1565 | ||
1566 | if (!IN_DEV_FORWARD(in_dev)) | |
251da413 | 1567 | goto no_route; |
1da177e4 LT |
1568 | if (res.type != RTN_UNICAST) |
1569 | goto martian_destination; | |
1570 | ||
68a5e3dd | 1571 | err = ip_mkroute_input(skb, &res, &fl4, in_dev, daddr, saddr, tos); |
1da177e4 LT |
1572 | out: return err; |
1573 | ||
1574 | brd_input: | |
1575 | if (skb->protocol != htons(ETH_P_IP)) | |
1576 | goto e_inval; | |
1577 | ||
41347dcd | 1578 | if (!ipv4_is_zeronet(saddr)) { |
9e56e380 DM |
1579 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
1580 | in_dev, &itag); | |
1da177e4 | 1581 | if (err < 0) |
b5f7e755 | 1582 | goto martian_source_keep_err; |
1da177e4 LT |
1583 | if (err) |
1584 | flags |= RTCF_DIRECTSRC; | |
1585 | } | |
1586 | flags |= RTCF_BROADCAST; | |
1587 | res.type = RTN_BROADCAST; | |
1588 | RT_CACHE_STAT_INC(in_brd); | |
1589 | ||
1590 | local_input: | |
d2d68ba9 DM |
1591 | do_cache = false; |
1592 | if (res.fi) { | |
1593 | if (!(flags & RTCF_DIRECTSRC) && !itag) { | |
1594 | rth = FIB_RES_NH(res).nh_rth_input; | |
1595 | if (rt_cache_valid(rth)) { | |
93ac5341 | 1596 | dst_hold(&rth->dst); |
d2d68ba9 DM |
1597 | goto set_and_out; |
1598 | } | |
1599 | do_cache = true; | |
1600 | } | |
1601 | } | |
1602 | ||
5c1e6aa3 | 1603 | rth = rt_dst_alloc(net->loopback_dev, |
d2d68ba9 | 1604 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false, do_cache); |
1da177e4 LT |
1605 | if (!rth) |
1606 | goto e_nobufs; | |
1607 | ||
cf911662 | 1608 | rth->dst.input= ip_local_deliver; |
d8d1f30b | 1609 | rth->dst.output= ip_rt_bug; |
cf911662 DM |
1610 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1611 | rth->dst.tclassid = itag; | |
1612 | #endif | |
1da177e4 | 1613 | |
cf911662 DM |
1614 | rth->rt_genid = rt_genid(net); |
1615 | rth->rt_flags = flags|RTCF_LOCAL; | |
1616 | rth->rt_type = res.type; | |
9917e1e8 | 1617 | rth->rt_is_input = 1; |
5e2b61f7 | 1618 | rth->rt_iif = dev->ifindex; |
5943634f | 1619 | rth->rt_pmtu = 0; |
f8126f1d | 1620 | rth->rt_gateway = 0; |
1da177e4 | 1621 | if (res.type == RTN_UNREACHABLE) { |
d8d1f30b CG |
1622 | rth->dst.input= ip_error; |
1623 | rth->dst.error= -err; | |
1da177e4 LT |
1624 | rth->rt_flags &= ~RTCF_LOCAL; |
1625 | } | |
d2d68ba9 DM |
1626 | if (do_cache) |
1627 | rt_cache_route(&FIB_RES_NH(res), rth); | |
1628 | set_and_out: | |
89aef892 | 1629 | skb_dst_set(skb, &rth->dst); |
b23dd4fe | 1630 | err = 0; |
ebc0ffae | 1631 | goto out; |
1da177e4 LT |
1632 | |
1633 | no_route: | |
1634 | RT_CACHE_STAT_INC(in_no_route); | |
1da177e4 | 1635 | res.type = RTN_UNREACHABLE; |
7f53878d MC |
1636 | if (err == -ESRCH) |
1637 | err = -ENETUNREACH; | |
1da177e4 LT |
1638 | goto local_input; |
1639 | ||
1640 | /* | |
1641 | * Do not cache martian addresses: they should be logged (RFC1812) | |
1642 | */ | |
1643 | martian_destination: | |
1644 | RT_CACHE_STAT_INC(in_martian_dst); | |
1645 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
e87cc472 JP |
1646 | if (IN_DEV_LOG_MARTIANS(in_dev)) |
1647 | net_warn_ratelimited("martian destination %pI4 from %pI4, dev %s\n", | |
1648 | &daddr, &saddr, dev->name); | |
1da177e4 | 1649 | #endif |
2c2910a4 | 1650 | |
1da177e4 LT |
1651 | e_inval: |
1652 | err = -EINVAL; | |
ebc0ffae | 1653 | goto out; |
1da177e4 LT |
1654 | |
1655 | e_nobufs: | |
1656 | err = -ENOBUFS; | |
ebc0ffae | 1657 | goto out; |
1da177e4 LT |
1658 | |
1659 | martian_source: | |
b5f7e755 ED |
1660 | err = -EINVAL; |
1661 | martian_source_keep_err: | |
1da177e4 | 1662 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); |
ebc0ffae | 1663 | goto out; |
1da177e4 LT |
1664 | } |
1665 | ||
38a424e4 DM |
1666 | int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1667 | u8 tos, struct net_device *dev) | |
1da177e4 | 1668 | { |
96d36220 | 1669 | int res; |
1da177e4 | 1670 | |
96d36220 ED |
1671 | rcu_read_lock(); |
1672 | ||
1da177e4 LT |
1673 | /* Multicast recognition logic is moved from route cache to here. |
1674 | The problem was that too many Ethernet cards have broken/missing | |
1675 | hardware multicast filters :-( As result the host on multicasting | |
1676 | network acquires a lot of useless route cache entries, sort of | |
1677 | SDR messages from all the world. Now we try to get rid of them. | |
1678 | Really, provided software IP multicast filter is organized | |
1679 | reasonably (at least, hashed), it does not result in a slowdown | |
1680 | comparing with route cache reject entries. | |
1681 | Note, that multicast routers are not affected, because | |
1682 | route cache entry is created eventually. | |
1683 | */ | |
f97c1e0c | 1684 | if (ipv4_is_multicast(daddr)) { |
96d36220 | 1685 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
1da177e4 | 1686 | |
96d36220 | 1687 | if (in_dev) { |
dbdd9a52 DM |
1688 | int our = ip_check_mc_rcu(in_dev, daddr, saddr, |
1689 | ip_hdr(skb)->protocol); | |
1da177e4 LT |
1690 | if (our |
1691 | #ifdef CONFIG_IP_MROUTE | |
9d4fb27d JP |
1692 | || |
1693 | (!ipv4_is_local_multicast(daddr) && | |
1694 | IN_DEV_MFORWARD(in_dev)) | |
1da177e4 | 1695 | #endif |
9d4fb27d | 1696 | ) { |
96d36220 ED |
1697 | int res = ip_route_input_mc(skb, daddr, saddr, |
1698 | tos, dev, our); | |
1da177e4 | 1699 | rcu_read_unlock(); |
96d36220 | 1700 | return res; |
1da177e4 LT |
1701 | } |
1702 | } | |
1703 | rcu_read_unlock(); | |
1704 | return -EINVAL; | |
1705 | } | |
c10237e0 | 1706 | res = ip_route_input_slow(skb, daddr, saddr, tos, dev); |
96d36220 ED |
1707 | rcu_read_unlock(); |
1708 | return res; | |
1da177e4 | 1709 | } |
38a424e4 | 1710 | EXPORT_SYMBOL(ip_route_input); |
1da177e4 | 1711 | |
ebc0ffae | 1712 | /* called with rcu_read_lock() */ |
982721f3 | 1713 | static struct rtable *__mkroute_output(const struct fib_result *res, |
1a00fee4 | 1714 | const struct flowi4 *fl4, int orig_oif, |
f61759e6 | 1715 | struct net_device *dev_out, |
5ada5527 | 1716 | unsigned int flags) |
1da177e4 | 1717 | { |
982721f3 | 1718 | struct fib_info *fi = res->fi; |
f2bb4bed | 1719 | struct fib_nh_exception *fnhe; |
5ada5527 | 1720 | struct in_device *in_dev; |
982721f3 | 1721 | u16 type = res->type; |
5ada5527 | 1722 | struct rtable *rth; |
1da177e4 | 1723 | |
d0daebc3 TG |
1724 | in_dev = __in_dev_get_rcu(dev_out); |
1725 | if (!in_dev) | |
5ada5527 | 1726 | return ERR_PTR(-EINVAL); |
1da177e4 | 1727 | |
d0daebc3 TG |
1728 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) |
1729 | if (ipv4_is_loopback(fl4->saddr) && !(dev_out->flags & IFF_LOOPBACK)) | |
1730 | return ERR_PTR(-EINVAL); | |
1731 | ||
68a5e3dd | 1732 | if (ipv4_is_lbcast(fl4->daddr)) |
982721f3 | 1733 | type = RTN_BROADCAST; |
68a5e3dd | 1734 | else if (ipv4_is_multicast(fl4->daddr)) |
982721f3 | 1735 | type = RTN_MULTICAST; |
68a5e3dd | 1736 | else if (ipv4_is_zeronet(fl4->daddr)) |
5ada5527 | 1737 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
1738 | |
1739 | if (dev_out->flags & IFF_LOOPBACK) | |
1740 | flags |= RTCF_LOCAL; | |
1741 | ||
982721f3 | 1742 | if (type == RTN_BROADCAST) { |
1da177e4 | 1743 | flags |= RTCF_BROADCAST | RTCF_LOCAL; |
982721f3 DM |
1744 | fi = NULL; |
1745 | } else if (type == RTN_MULTICAST) { | |
dd28d1a0 | 1746 | flags |= RTCF_MULTICAST | RTCF_LOCAL; |
813b3b5d DM |
1747 | if (!ip_check_mc_rcu(in_dev, fl4->daddr, fl4->saddr, |
1748 | fl4->flowi4_proto)) | |
1da177e4 LT |
1749 | flags &= ~RTCF_LOCAL; |
1750 | /* If multicast route do not exist use | |
dd28d1a0 ED |
1751 | * default one, but do not gateway in this case. |
1752 | * Yes, it is hack. | |
1da177e4 | 1753 | */ |
982721f3 DM |
1754 | if (fi && res->prefixlen < 4) |
1755 | fi = NULL; | |
1da177e4 LT |
1756 | } |
1757 | ||
f2bb4bed DM |
1758 | fnhe = NULL; |
1759 | if (fi) { | |
1760 | fnhe = find_exception(&FIB_RES_NH(*res), fl4->daddr); | |
1761 | if (!fnhe) { | |
1762 | rth = FIB_RES_NH(*res).nh_rth_output; | |
d2d68ba9 | 1763 | if (rt_cache_valid(rth)) { |
93ac5341 | 1764 | dst_hold(&rth->dst); |
f2bb4bed DM |
1765 | return rth; |
1766 | } | |
1767 | } | |
1768 | } | |
5c1e6aa3 DM |
1769 | rth = rt_dst_alloc(dev_out, |
1770 | IN_DEV_CONF_GET(in_dev, NOPOLICY), | |
f2bb4bed DM |
1771 | IN_DEV_CONF_GET(in_dev, NOXFRM), |
1772 | fi && !fnhe); | |
8391d07b | 1773 | if (!rth) |
5ada5527 | 1774 | return ERR_PTR(-ENOBUFS); |
8391d07b | 1775 | |
cf911662 DM |
1776 | rth->dst.output = ip_output; |
1777 | ||
cf911662 DM |
1778 | rth->rt_genid = rt_genid(dev_net(dev_out)); |
1779 | rth->rt_flags = flags; | |
1780 | rth->rt_type = type; | |
9917e1e8 | 1781 | rth->rt_is_input = 0; |
813b3b5d | 1782 | rth->rt_iif = orig_oif ? : dev_out->ifindex; |
5943634f | 1783 | rth->rt_pmtu = 0; |
f8126f1d | 1784 | rth->rt_gateway = 0; |
1da177e4 LT |
1785 | |
1786 | RT_CACHE_STAT_INC(out_slow_tot); | |
1787 | ||
41347dcd | 1788 | if (flags & RTCF_LOCAL) |
d8d1f30b | 1789 | rth->dst.input = ip_local_deliver; |
1da177e4 | 1790 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { |
e905a9ed | 1791 | if (flags & RTCF_LOCAL && |
1da177e4 | 1792 | !(dev_out->flags & IFF_LOOPBACK)) { |
d8d1f30b | 1793 | rth->dst.output = ip_mc_output; |
1da177e4 LT |
1794 | RT_CACHE_STAT_INC(out_slow_mc); |
1795 | } | |
1796 | #ifdef CONFIG_IP_MROUTE | |
982721f3 | 1797 | if (type == RTN_MULTICAST) { |
1da177e4 | 1798 | if (IN_DEV_MFORWARD(in_dev) && |
813b3b5d | 1799 | !ipv4_is_local_multicast(fl4->daddr)) { |
d8d1f30b CG |
1800 | rth->dst.input = ip_mr_input; |
1801 | rth->dst.output = ip_mc_output; | |
1da177e4 LT |
1802 | } |
1803 | } | |
1804 | #endif | |
1805 | } | |
1806 | ||
f2bb4bed | 1807 | rt_set_nexthop(rth, fl4->daddr, res, fnhe, fi, type, 0); |
1da177e4 | 1808 | |
5ada5527 | 1809 | return rth; |
1da177e4 LT |
1810 | } |
1811 | ||
1da177e4 LT |
1812 | /* |
1813 | * Major route resolver routine. | |
1814 | */ | |
1815 | ||
89aef892 | 1816 | struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *fl4) |
1da177e4 | 1817 | { |
1da177e4 | 1818 | struct net_device *dev_out = NULL; |
f61759e6 | 1819 | __u8 tos = RT_FL_TOS(fl4); |
813b3b5d DM |
1820 | unsigned int flags = 0; |
1821 | struct fib_result res; | |
5ada5527 | 1822 | struct rtable *rth; |
813b3b5d | 1823 | int orig_oif; |
1da177e4 | 1824 | |
85b91b03 | 1825 | res.tclassid = 0; |
1da177e4 | 1826 | res.fi = NULL; |
8b96d22d | 1827 | res.table = NULL; |
1da177e4 | 1828 | |
813b3b5d DM |
1829 | orig_oif = fl4->flowi4_oif; |
1830 | ||
1831 | fl4->flowi4_iif = net->loopback_dev->ifindex; | |
1832 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; | |
1833 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
1834 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
44713b67 | 1835 | |
010c2708 | 1836 | rcu_read_lock(); |
813b3b5d | 1837 | if (fl4->saddr) { |
b23dd4fe | 1838 | rth = ERR_PTR(-EINVAL); |
813b3b5d DM |
1839 | if (ipv4_is_multicast(fl4->saddr) || |
1840 | ipv4_is_lbcast(fl4->saddr) || | |
1841 | ipv4_is_zeronet(fl4->saddr)) | |
1da177e4 LT |
1842 | goto out; |
1843 | ||
1da177e4 LT |
1844 | /* I removed check for oif == dev_out->oif here. |
1845 | It was wrong for two reasons: | |
1ab35276 DL |
1846 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
1847 | is assigned to multiple interfaces. | |
1da177e4 LT |
1848 | 2. Moreover, we are allowed to send packets with saddr |
1849 | of another iface. --ANK | |
1850 | */ | |
1851 | ||
813b3b5d DM |
1852 | if (fl4->flowi4_oif == 0 && |
1853 | (ipv4_is_multicast(fl4->daddr) || | |
1854 | ipv4_is_lbcast(fl4->daddr))) { | |
a210d01a | 1855 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 1856 | dev_out = __ip_dev_find(net, fl4->saddr, false); |
a210d01a JA |
1857 | if (dev_out == NULL) |
1858 | goto out; | |
1859 | ||
1da177e4 LT |
1860 | /* Special hack: user can direct multicasts |
1861 | and limited broadcast via necessary interface | |
1862 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. | |
1863 | This hack is not just for fun, it allows | |
1864 | vic,vat and friends to work. | |
1865 | They bind socket to loopback, set ttl to zero | |
1866 | and expect that it will work. | |
1867 | From the viewpoint of routing cache they are broken, | |
1868 | because we are not allowed to build multicast path | |
1869 | with loopback source addr (look, routing cache | |
1870 | cannot know, that ttl is zero, so that packet | |
1871 | will not leave this host and route is valid). | |
1872 | Luckily, this hack is good workaround. | |
1873 | */ | |
1874 | ||
813b3b5d | 1875 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
1876 | goto make_route; |
1877 | } | |
a210d01a | 1878 | |
813b3b5d | 1879 | if (!(fl4->flowi4_flags & FLOWI_FLAG_ANYSRC)) { |
a210d01a | 1880 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 1881 | if (!__ip_dev_find(net, fl4->saddr, false)) |
a210d01a | 1882 | goto out; |
a210d01a | 1883 | } |
1da177e4 LT |
1884 | } |
1885 | ||
1886 | ||
813b3b5d DM |
1887 | if (fl4->flowi4_oif) { |
1888 | dev_out = dev_get_by_index_rcu(net, fl4->flowi4_oif); | |
b23dd4fe | 1889 | rth = ERR_PTR(-ENODEV); |
1da177e4 LT |
1890 | if (dev_out == NULL) |
1891 | goto out; | |
e5ed6399 HX |
1892 | |
1893 | /* RACE: Check return value of inet_select_addr instead. */ | |
fc75fc83 | 1894 | if (!(dev_out->flags & IFF_UP) || !__in_dev_get_rcu(dev_out)) { |
b23dd4fe | 1895 | rth = ERR_PTR(-ENETUNREACH); |
fc75fc83 ED |
1896 | goto out; |
1897 | } | |
813b3b5d DM |
1898 | if (ipv4_is_local_multicast(fl4->daddr) || |
1899 | ipv4_is_lbcast(fl4->daddr)) { | |
1900 | if (!fl4->saddr) | |
1901 | fl4->saddr = inet_select_addr(dev_out, 0, | |
1902 | RT_SCOPE_LINK); | |
1da177e4 LT |
1903 | goto make_route; |
1904 | } | |
813b3b5d DM |
1905 | if (fl4->saddr) { |
1906 | if (ipv4_is_multicast(fl4->daddr)) | |
1907 | fl4->saddr = inet_select_addr(dev_out, 0, | |
1908 | fl4->flowi4_scope); | |
1909 | else if (!fl4->daddr) | |
1910 | fl4->saddr = inet_select_addr(dev_out, 0, | |
1911 | RT_SCOPE_HOST); | |
1da177e4 LT |
1912 | } |
1913 | } | |
1914 | ||
813b3b5d DM |
1915 | if (!fl4->daddr) { |
1916 | fl4->daddr = fl4->saddr; | |
1917 | if (!fl4->daddr) | |
1918 | fl4->daddr = fl4->saddr = htonl(INADDR_LOOPBACK); | |
b40afd0e | 1919 | dev_out = net->loopback_dev; |
813b3b5d | 1920 | fl4->flowi4_oif = net->loopback_dev->ifindex; |
1da177e4 LT |
1921 | res.type = RTN_LOCAL; |
1922 | flags |= RTCF_LOCAL; | |
1923 | goto make_route; | |
1924 | } | |
1925 | ||
813b3b5d | 1926 | if (fib_lookup(net, fl4, &res)) { |
1da177e4 | 1927 | res.fi = NULL; |
8b96d22d | 1928 | res.table = NULL; |
813b3b5d | 1929 | if (fl4->flowi4_oif) { |
1da177e4 LT |
1930 | /* Apparently, routing tables are wrong. Assume, |
1931 | that the destination is on link. | |
1932 | ||
1933 | WHY? DW. | |
1934 | Because we are allowed to send to iface | |
1935 | even if it has NO routes and NO assigned | |
1936 | addresses. When oif is specified, routing | |
1937 | tables are looked up with only one purpose: | |
1938 | to catch if destination is gatewayed, rather than | |
1939 | direct. Moreover, if MSG_DONTROUTE is set, | |
1940 | we send packet, ignoring both routing tables | |
1941 | and ifaddr state. --ANK | |
1942 | ||
1943 | ||
1944 | We could make it even if oif is unknown, | |
1945 | likely IPv6, but we do not. | |
1946 | */ | |
1947 | ||
813b3b5d DM |
1948 | if (fl4->saddr == 0) |
1949 | fl4->saddr = inet_select_addr(dev_out, 0, | |
1950 | RT_SCOPE_LINK); | |
1da177e4 LT |
1951 | res.type = RTN_UNICAST; |
1952 | goto make_route; | |
1953 | } | |
b23dd4fe | 1954 | rth = ERR_PTR(-ENETUNREACH); |
1da177e4 LT |
1955 | goto out; |
1956 | } | |
1da177e4 LT |
1957 | |
1958 | if (res.type == RTN_LOCAL) { | |
813b3b5d | 1959 | if (!fl4->saddr) { |
9fc3bbb4 | 1960 | if (res.fi->fib_prefsrc) |
813b3b5d | 1961 | fl4->saddr = res.fi->fib_prefsrc; |
9fc3bbb4 | 1962 | else |
813b3b5d | 1963 | fl4->saddr = fl4->daddr; |
9fc3bbb4 | 1964 | } |
b40afd0e | 1965 | dev_out = net->loopback_dev; |
813b3b5d | 1966 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
1967 | res.fi = NULL; |
1968 | flags |= RTCF_LOCAL; | |
1969 | goto make_route; | |
1970 | } | |
1971 | ||
1972 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
813b3b5d | 1973 | if (res.fi->fib_nhs > 1 && fl4->flowi4_oif == 0) |
1b7fe593 | 1974 | fib_select_multipath(&res); |
1da177e4 LT |
1975 | else |
1976 | #endif | |
21d8c49e DM |
1977 | if (!res.prefixlen && |
1978 | res.table->tb_num_default > 1 && | |
813b3b5d | 1979 | res.type == RTN_UNICAST && !fl4->flowi4_oif) |
0c838ff1 | 1980 | fib_select_default(&res); |
1da177e4 | 1981 | |
813b3b5d DM |
1982 | if (!fl4->saddr) |
1983 | fl4->saddr = FIB_RES_PREFSRC(net, res); | |
1da177e4 | 1984 | |
1da177e4 | 1985 | dev_out = FIB_RES_DEV(res); |
813b3b5d | 1986 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
1987 | |
1988 | ||
1989 | make_route: | |
1a00fee4 | 1990 | rth = __mkroute_output(&res, fl4, orig_oif, dev_out, flags); |
1da177e4 | 1991 | |
010c2708 DM |
1992 | out: |
1993 | rcu_read_unlock(); | |
b23dd4fe | 1994 | return rth; |
1da177e4 | 1995 | } |
d8c97a94 ACM |
1996 | EXPORT_SYMBOL_GPL(__ip_route_output_key); |
1997 | ||
ae2688d5 JW |
1998 | static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 cookie) |
1999 | { | |
2000 | return NULL; | |
2001 | } | |
2002 | ||
ebb762f2 | 2003 | static unsigned int ipv4_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 2004 | { |
618f9bc7 SK |
2005 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
2006 | ||
2007 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
2008 | } |
2009 | ||
6700c270 DM |
2010 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
2011 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
2012 | { |
2013 | } | |
2014 | ||
6700c270 DM |
2015 | static void ipv4_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
2016 | struct sk_buff *skb) | |
b587ee3b DM |
2017 | { |
2018 | } | |
2019 | ||
0972ddb2 HB |
2020 | static u32 *ipv4_rt_blackhole_cow_metrics(struct dst_entry *dst, |
2021 | unsigned long old) | |
2022 | { | |
2023 | return NULL; | |
2024 | } | |
2025 | ||
14e50e57 DM |
2026 | static struct dst_ops ipv4_dst_blackhole_ops = { |
2027 | .family = AF_INET, | |
09640e63 | 2028 | .protocol = cpu_to_be16(ETH_P_IP), |
ae2688d5 | 2029 | .check = ipv4_blackhole_dst_check, |
ebb762f2 | 2030 | .mtu = ipv4_blackhole_mtu, |
214f45c9 | 2031 | .default_advmss = ipv4_default_advmss, |
14e50e57 | 2032 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, |
b587ee3b | 2033 | .redirect = ipv4_rt_blackhole_redirect, |
0972ddb2 | 2034 | .cow_metrics = ipv4_rt_blackhole_cow_metrics, |
d3aaeb38 | 2035 | .neigh_lookup = ipv4_neigh_lookup, |
14e50e57 DM |
2036 | }; |
2037 | ||
2774c131 | 2038 | struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 2039 | { |
2774c131 | 2040 | struct rtable *ort = (struct rtable *) dst_orig; |
f5b0a874 | 2041 | struct rtable *rt; |
14e50e57 | 2042 | |
f5b0a874 | 2043 | rt = dst_alloc(&ipv4_dst_blackhole_ops, NULL, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 2044 | if (rt) { |
d8d1f30b | 2045 | struct dst_entry *new = &rt->dst; |
14e50e57 | 2046 | |
14e50e57 | 2047 | new->__use = 1; |
352e512c HX |
2048 | new->input = dst_discard; |
2049 | new->output = dst_discard; | |
14e50e57 | 2050 | |
d8d1f30b | 2051 | new->dev = ort->dst.dev; |
14e50e57 DM |
2052 | if (new->dev) |
2053 | dev_hold(new->dev); | |
2054 | ||
9917e1e8 | 2055 | rt->rt_is_input = ort->rt_is_input; |
5e2b61f7 | 2056 | rt->rt_iif = ort->rt_iif; |
5943634f | 2057 | rt->rt_pmtu = ort->rt_pmtu; |
14e50e57 | 2058 | |
e84f84f2 | 2059 | rt->rt_genid = rt_genid(net); |
14e50e57 DM |
2060 | rt->rt_flags = ort->rt_flags; |
2061 | rt->rt_type = ort->rt_type; | |
14e50e57 | 2062 | rt->rt_gateway = ort->rt_gateway; |
14e50e57 DM |
2063 | |
2064 | dst_free(new); | |
2065 | } | |
2066 | ||
2774c131 DM |
2067 | dst_release(dst_orig); |
2068 | ||
2069 | return rt ? &rt->dst : ERR_PTR(-ENOMEM); | |
14e50e57 DM |
2070 | } |
2071 | ||
9d6ec938 | 2072 | struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4, |
b23dd4fe | 2073 | struct sock *sk) |
1da177e4 | 2074 | { |
9d6ec938 | 2075 | struct rtable *rt = __ip_route_output_key(net, flp4); |
1da177e4 | 2076 | |
b23dd4fe DM |
2077 | if (IS_ERR(rt)) |
2078 | return rt; | |
1da177e4 | 2079 | |
56157872 | 2080 | if (flp4->flowi4_proto) |
9d6ec938 DM |
2081 | rt = (struct rtable *) xfrm_lookup(net, &rt->dst, |
2082 | flowi4_to_flowi(flp4), | |
2083 | sk, 0); | |
1da177e4 | 2084 | |
b23dd4fe | 2085 | return rt; |
1da177e4 | 2086 | } |
d8c97a94 ACM |
2087 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
2088 | ||
f1ce3062 DM |
2089 | static int rt_fill_info(struct net *net, __be32 dst, __be32 src, |
2090 | struct flowi4 *fl4, struct sk_buff *skb, u32 pid, | |
2091 | u32 seq, int event, int nowait, unsigned int flags) | |
1da177e4 | 2092 | { |
511c3f92 | 2093 | struct rtable *rt = skb_rtable(skb); |
1da177e4 | 2094 | struct rtmsg *r; |
be403ea1 | 2095 | struct nlmsghdr *nlh; |
2bc8ca40 | 2096 | unsigned long expires = 0; |
f185071d | 2097 | u32 error; |
521f5490 | 2098 | u32 metrics[RTAX_MAX]; |
be403ea1 TG |
2099 | |
2100 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags); | |
2101 | if (nlh == NULL) | |
26932566 | 2102 | return -EMSGSIZE; |
be403ea1 TG |
2103 | |
2104 | r = nlmsg_data(nlh); | |
1da177e4 LT |
2105 | r->rtm_family = AF_INET; |
2106 | r->rtm_dst_len = 32; | |
2107 | r->rtm_src_len = 0; | |
d6c0a4f6 | 2108 | r->rtm_tos = fl4->flowi4_tos; |
1da177e4 | 2109 | r->rtm_table = RT_TABLE_MAIN; |
f3756b79 DM |
2110 | if (nla_put_u32(skb, RTA_TABLE, RT_TABLE_MAIN)) |
2111 | goto nla_put_failure; | |
1da177e4 LT |
2112 | r->rtm_type = rt->rt_type; |
2113 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2114 | r->rtm_protocol = RTPROT_UNSPEC; | |
2115 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
2116 | if (rt->rt_flags & RTCF_NOTIFY) | |
2117 | r->rtm_flags |= RTM_F_NOTIFY; | |
be403ea1 | 2118 | |
f1ce3062 | 2119 | if (nla_put_be32(skb, RTA_DST, dst)) |
f3756b79 | 2120 | goto nla_put_failure; |
1a00fee4 | 2121 | if (src) { |
1da177e4 | 2122 | r->rtm_src_len = 32; |
1a00fee4 | 2123 | if (nla_put_be32(skb, RTA_SRC, src)) |
f3756b79 | 2124 | goto nla_put_failure; |
1da177e4 | 2125 | } |
f3756b79 DM |
2126 | if (rt->dst.dev && |
2127 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2128 | goto nla_put_failure; | |
c7066f70 | 2129 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
2130 | if (rt->dst.tclassid && |
2131 | nla_put_u32(skb, RTA_FLOW, rt->dst.tclassid)) | |
2132 | goto nla_put_failure; | |
1da177e4 | 2133 | #endif |
41347dcd | 2134 | if (!rt_is_input_route(rt) && |
d6c0a4f6 DM |
2135 | fl4->saddr != src) { |
2136 | if (nla_put_be32(skb, RTA_PREFSRC, fl4->saddr)) | |
f3756b79 DM |
2137 | goto nla_put_failure; |
2138 | } | |
f8126f1d | 2139 | if (rt->rt_gateway && |
f3756b79 DM |
2140 | nla_put_be32(skb, RTA_GATEWAY, rt->rt_gateway)) |
2141 | goto nla_put_failure; | |
be403ea1 | 2142 | |
521f5490 JA |
2143 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
2144 | if (rt->rt_pmtu) | |
2145 | metrics[RTAX_MTU - 1] = rt->rt_pmtu; | |
2146 | if (rtnetlink_put_metrics(skb, metrics) < 0) | |
be403ea1 TG |
2147 | goto nla_put_failure; |
2148 | ||
b4869889 DM |
2149 | if (fl4->flowi4_mark && |
2150 | nla_put_be32(skb, RTA_MARK, fl4->flowi4_mark)) | |
f3756b79 | 2151 | goto nla_put_failure; |
963bfeee | 2152 | |
d8d1f30b | 2153 | error = rt->dst.error; |
5943634f DM |
2154 | expires = rt->dst.expires; |
2155 | if (expires) { | |
2156 | if (time_before(jiffies, expires)) | |
2157 | expires -= jiffies; | |
2158 | else | |
2159 | expires = 0; | |
1da177e4 | 2160 | } |
be403ea1 | 2161 | |
c7537967 | 2162 | if (rt_is_input_route(rt)) { |
f1ce3062 DM |
2163 | if (nla_put_u32(skb, RTA_IIF, rt->rt_iif)) |
2164 | goto nla_put_failure; | |
1da177e4 LT |
2165 | } |
2166 | ||
f185071d | 2167 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, error) < 0) |
e3703b3d | 2168 | goto nla_put_failure; |
be403ea1 TG |
2169 | |
2170 | return nlmsg_end(skb, nlh); | |
1da177e4 | 2171 | |
be403ea1 | 2172 | nla_put_failure: |
26932566 PM |
2173 | nlmsg_cancel(skb, nlh); |
2174 | return -EMSGSIZE; | |
1da177e4 LT |
2175 | } |
2176 | ||
5e73ea1a | 2177 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 2178 | { |
3b1e0a65 | 2179 | struct net *net = sock_net(in_skb->sk); |
d889ce3b TG |
2180 | struct rtmsg *rtm; |
2181 | struct nlattr *tb[RTA_MAX+1]; | |
1da177e4 | 2182 | struct rtable *rt = NULL; |
d6c0a4f6 | 2183 | struct flowi4 fl4; |
9e12bb22 AV |
2184 | __be32 dst = 0; |
2185 | __be32 src = 0; | |
2186 | u32 iif; | |
d889ce3b | 2187 | int err; |
963bfeee | 2188 | int mark; |
1da177e4 LT |
2189 | struct sk_buff *skb; |
2190 | ||
d889ce3b TG |
2191 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy); |
2192 | if (err < 0) | |
2193 | goto errout; | |
2194 | ||
2195 | rtm = nlmsg_data(nlh); | |
2196 | ||
1da177e4 | 2197 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
d889ce3b TG |
2198 | if (skb == NULL) { |
2199 | err = -ENOBUFS; | |
2200 | goto errout; | |
2201 | } | |
1da177e4 LT |
2202 | |
2203 | /* Reserve room for dummy headers, this skb can pass | |
2204 | through good chunk of routing engine. | |
2205 | */ | |
459a98ed | 2206 | skb_reset_mac_header(skb); |
c1d2bbe1 | 2207 | skb_reset_network_header(skb); |
d2c962b8 SH |
2208 | |
2209 | /* Bugfix: need to give ip_route_input enough of an IP header to not gag. */ | |
eddc9ec5 | 2210 | ip_hdr(skb)->protocol = IPPROTO_ICMP; |
1da177e4 LT |
2211 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
2212 | ||
17fb2c64 AV |
2213 | src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0; |
2214 | dst = tb[RTA_DST] ? nla_get_be32(tb[RTA_DST]) : 0; | |
d889ce3b | 2215 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
963bfeee | 2216 | mark = tb[RTA_MARK] ? nla_get_u32(tb[RTA_MARK]) : 0; |
1da177e4 | 2217 | |
d6c0a4f6 DM |
2218 | memset(&fl4, 0, sizeof(fl4)); |
2219 | fl4.daddr = dst; | |
2220 | fl4.saddr = src; | |
2221 | fl4.flowi4_tos = rtm->rtm_tos; | |
2222 | fl4.flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0; | |
2223 | fl4.flowi4_mark = mark; | |
2224 | ||
1da177e4 | 2225 | if (iif) { |
d889ce3b TG |
2226 | struct net_device *dev; |
2227 | ||
1937504d | 2228 | dev = __dev_get_by_index(net, iif); |
d889ce3b TG |
2229 | if (dev == NULL) { |
2230 | err = -ENODEV; | |
2231 | goto errout_free; | |
2232 | } | |
2233 | ||
1da177e4 LT |
2234 | skb->protocol = htons(ETH_P_IP); |
2235 | skb->dev = dev; | |
963bfeee | 2236 | skb->mark = mark; |
1da177e4 LT |
2237 | local_bh_disable(); |
2238 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); | |
2239 | local_bh_enable(); | |
d889ce3b | 2240 | |
511c3f92 | 2241 | rt = skb_rtable(skb); |
d8d1f30b CG |
2242 | if (err == 0 && rt->dst.error) |
2243 | err = -rt->dst.error; | |
1da177e4 | 2244 | } else { |
9d6ec938 | 2245 | rt = ip_route_output_key(net, &fl4); |
b23dd4fe DM |
2246 | |
2247 | err = 0; | |
2248 | if (IS_ERR(rt)) | |
2249 | err = PTR_ERR(rt); | |
1da177e4 | 2250 | } |
d889ce3b | 2251 | |
1da177e4 | 2252 | if (err) |
d889ce3b | 2253 | goto errout_free; |
1da177e4 | 2254 | |
d8d1f30b | 2255 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
2256 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
2257 | rt->rt_flags |= RTCF_NOTIFY; | |
2258 | ||
f1ce3062 | 2259 | err = rt_fill_info(net, dst, src, &fl4, skb, |
1a00fee4 | 2260 | NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, |
1937504d | 2261 | RTM_NEWROUTE, 0, 0); |
d889ce3b TG |
2262 | if (err <= 0) |
2263 | goto errout_free; | |
1da177e4 | 2264 | |
1937504d | 2265 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
d889ce3b | 2266 | errout: |
2942e900 | 2267 | return err; |
1da177e4 | 2268 | |
d889ce3b | 2269 | errout_free: |
1da177e4 | 2270 | kfree_skb(skb); |
d889ce3b | 2271 | goto errout; |
1da177e4 LT |
2272 | } |
2273 | ||
2274 | int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2275 | { | |
1da177e4 LT |
2276 | return skb->len; |
2277 | } | |
2278 | ||
2279 | void ip_rt_multicast_event(struct in_device *in_dev) | |
2280 | { | |
76e6ebfb | 2281 | rt_cache_flush(dev_net(in_dev->dev), 0); |
1da177e4 LT |
2282 | } |
2283 | ||
2284 | #ifdef CONFIG_SYSCTL | |
81c684d1 | 2285 | static int ipv4_sysctl_rtcache_flush(ctl_table *__ctl, int write, |
8d65af78 | 2286 | void __user *buffer, |
1da177e4 LT |
2287 | size_t *lenp, loff_t *ppos) |
2288 | { | |
2289 | if (write) { | |
639e104f | 2290 | int flush_delay; |
81c684d1 | 2291 | ctl_table ctl; |
39a23e75 | 2292 | struct net *net; |
639e104f | 2293 | |
81c684d1 DL |
2294 | memcpy(&ctl, __ctl, sizeof(ctl)); |
2295 | ctl.data = &flush_delay; | |
8d65af78 | 2296 | proc_dointvec(&ctl, write, buffer, lenp, ppos); |
639e104f | 2297 | |
81c684d1 | 2298 | net = (struct net *)__ctl->extra1; |
39a23e75 | 2299 | rt_cache_flush(net, flush_delay); |
1da177e4 | 2300 | return 0; |
e905a9ed | 2301 | } |
1da177e4 LT |
2302 | |
2303 | return -EINVAL; | |
2304 | } | |
2305 | ||
eeb61f71 | 2306 | static ctl_table ipv4_route_table[] = { |
1da177e4 | 2307 | { |
1da177e4 LT |
2308 | .procname = "gc_thresh", |
2309 | .data = &ipv4_dst_ops.gc_thresh, | |
2310 | .maxlen = sizeof(int), | |
2311 | .mode = 0644, | |
6d9f239a | 2312 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2313 | }, |
2314 | { | |
1da177e4 LT |
2315 | .procname = "max_size", |
2316 | .data = &ip_rt_max_size, | |
2317 | .maxlen = sizeof(int), | |
2318 | .mode = 0644, | |
6d9f239a | 2319 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2320 | }, |
2321 | { | |
2322 | /* Deprecated. Use gc_min_interval_ms */ | |
e905a9ed | 2323 | |
1da177e4 LT |
2324 | .procname = "gc_min_interval", |
2325 | .data = &ip_rt_gc_min_interval, | |
2326 | .maxlen = sizeof(int), | |
2327 | .mode = 0644, | |
6d9f239a | 2328 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2329 | }, |
2330 | { | |
1da177e4 LT |
2331 | .procname = "gc_min_interval_ms", |
2332 | .data = &ip_rt_gc_min_interval, | |
2333 | .maxlen = sizeof(int), | |
2334 | .mode = 0644, | |
6d9f239a | 2335 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 LT |
2336 | }, |
2337 | { | |
1da177e4 LT |
2338 | .procname = "gc_timeout", |
2339 | .data = &ip_rt_gc_timeout, | |
2340 | .maxlen = sizeof(int), | |
2341 | .mode = 0644, | |
6d9f239a | 2342 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 | 2343 | }, |
9f28a2fc ED |
2344 | { |
2345 | .procname = "gc_interval", | |
2346 | .data = &ip_rt_gc_interval, | |
2347 | .maxlen = sizeof(int), | |
2348 | .mode = 0644, | |
2349 | .proc_handler = proc_dointvec_jiffies, | |
2350 | }, | |
1da177e4 | 2351 | { |
1da177e4 LT |
2352 | .procname = "redirect_load", |
2353 | .data = &ip_rt_redirect_load, | |
2354 | .maxlen = sizeof(int), | |
2355 | .mode = 0644, | |
6d9f239a | 2356 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2357 | }, |
2358 | { | |
1da177e4 LT |
2359 | .procname = "redirect_number", |
2360 | .data = &ip_rt_redirect_number, | |
2361 | .maxlen = sizeof(int), | |
2362 | .mode = 0644, | |
6d9f239a | 2363 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2364 | }, |
2365 | { | |
1da177e4 LT |
2366 | .procname = "redirect_silence", |
2367 | .data = &ip_rt_redirect_silence, | |
2368 | .maxlen = sizeof(int), | |
2369 | .mode = 0644, | |
6d9f239a | 2370 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2371 | }, |
2372 | { | |
1da177e4 LT |
2373 | .procname = "error_cost", |
2374 | .data = &ip_rt_error_cost, | |
2375 | .maxlen = sizeof(int), | |
2376 | .mode = 0644, | |
6d9f239a | 2377 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2378 | }, |
2379 | { | |
1da177e4 LT |
2380 | .procname = "error_burst", |
2381 | .data = &ip_rt_error_burst, | |
2382 | .maxlen = sizeof(int), | |
2383 | .mode = 0644, | |
6d9f239a | 2384 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2385 | }, |
2386 | { | |
1da177e4 LT |
2387 | .procname = "gc_elasticity", |
2388 | .data = &ip_rt_gc_elasticity, | |
2389 | .maxlen = sizeof(int), | |
2390 | .mode = 0644, | |
6d9f239a | 2391 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2392 | }, |
2393 | { | |
1da177e4 LT |
2394 | .procname = "mtu_expires", |
2395 | .data = &ip_rt_mtu_expires, | |
2396 | .maxlen = sizeof(int), | |
2397 | .mode = 0644, | |
6d9f239a | 2398 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2399 | }, |
2400 | { | |
1da177e4 LT |
2401 | .procname = "min_pmtu", |
2402 | .data = &ip_rt_min_pmtu, | |
2403 | .maxlen = sizeof(int), | |
2404 | .mode = 0644, | |
6d9f239a | 2405 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2406 | }, |
2407 | { | |
1da177e4 LT |
2408 | .procname = "min_adv_mss", |
2409 | .data = &ip_rt_min_advmss, | |
2410 | .maxlen = sizeof(int), | |
2411 | .mode = 0644, | |
6d9f239a | 2412 | .proc_handler = proc_dointvec, |
1da177e4 | 2413 | }, |
f8572d8f | 2414 | { } |
1da177e4 | 2415 | }; |
39a23e75 | 2416 | |
39a23e75 DL |
2417 | static struct ctl_table ipv4_route_flush_table[] = { |
2418 | { | |
39a23e75 DL |
2419 | .procname = "flush", |
2420 | .maxlen = sizeof(int), | |
2421 | .mode = 0200, | |
6d9f239a | 2422 | .proc_handler = ipv4_sysctl_rtcache_flush, |
39a23e75 | 2423 | }, |
f8572d8f | 2424 | { }, |
39a23e75 DL |
2425 | }; |
2426 | ||
2427 | static __net_init int sysctl_route_net_init(struct net *net) | |
2428 | { | |
2429 | struct ctl_table *tbl; | |
2430 | ||
2431 | tbl = ipv4_route_flush_table; | |
09ad9bc7 | 2432 | if (!net_eq(net, &init_net)) { |
39a23e75 DL |
2433 | tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL); |
2434 | if (tbl == NULL) | |
2435 | goto err_dup; | |
2436 | } | |
2437 | tbl[0].extra1 = net; | |
2438 | ||
ec8f23ce | 2439 | net->ipv4.route_hdr = register_net_sysctl(net, "net/ipv4/route", tbl); |
39a23e75 DL |
2440 | if (net->ipv4.route_hdr == NULL) |
2441 | goto err_reg; | |
2442 | return 0; | |
2443 | ||
2444 | err_reg: | |
2445 | if (tbl != ipv4_route_flush_table) | |
2446 | kfree(tbl); | |
2447 | err_dup: | |
2448 | return -ENOMEM; | |
2449 | } | |
2450 | ||
2451 | static __net_exit void sysctl_route_net_exit(struct net *net) | |
2452 | { | |
2453 | struct ctl_table *tbl; | |
2454 | ||
2455 | tbl = net->ipv4.route_hdr->ctl_table_arg; | |
2456 | unregister_net_sysctl_table(net->ipv4.route_hdr); | |
2457 | BUG_ON(tbl == ipv4_route_flush_table); | |
2458 | kfree(tbl); | |
2459 | } | |
2460 | ||
2461 | static __net_initdata struct pernet_operations sysctl_route_ops = { | |
2462 | .init = sysctl_route_net_init, | |
2463 | .exit = sysctl_route_net_exit, | |
2464 | }; | |
1da177e4 LT |
2465 | #endif |
2466 | ||
3ee94372 | 2467 | static __net_init int rt_genid_init(struct net *net) |
9f5e97e5 | 2468 | { |
3ee94372 NH |
2469 | get_random_bytes(&net->ipv4.rt_genid, |
2470 | sizeof(net->ipv4.rt_genid)); | |
436c3b66 DM |
2471 | get_random_bytes(&net->ipv4.dev_addr_genid, |
2472 | sizeof(net->ipv4.dev_addr_genid)); | |
9f5e97e5 DL |
2473 | return 0; |
2474 | } | |
2475 | ||
3ee94372 NH |
2476 | static __net_initdata struct pernet_operations rt_genid_ops = { |
2477 | .init = rt_genid_init, | |
9f5e97e5 DL |
2478 | }; |
2479 | ||
c3426b47 DM |
2480 | static int __net_init ipv4_inetpeer_init(struct net *net) |
2481 | { | |
2482 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
2483 | ||
2484 | if (!bp) | |
2485 | return -ENOMEM; | |
2486 | inet_peer_base_init(bp); | |
2487 | net->ipv4.peers = bp; | |
2488 | return 0; | |
2489 | } | |
2490 | ||
2491 | static void __net_exit ipv4_inetpeer_exit(struct net *net) | |
2492 | { | |
2493 | struct inet_peer_base *bp = net->ipv4.peers; | |
2494 | ||
2495 | net->ipv4.peers = NULL; | |
56a6b248 | 2496 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
2497 | kfree(bp); |
2498 | } | |
2499 | ||
2500 | static __net_initdata struct pernet_operations ipv4_inetpeer_ops = { | |
2501 | .init = ipv4_inetpeer_init, | |
2502 | .exit = ipv4_inetpeer_exit, | |
2503 | }; | |
9f5e97e5 | 2504 | |
c7066f70 | 2505 | #ifdef CONFIG_IP_ROUTE_CLASSID |
7d720c3e | 2506 | struct ip_rt_acct __percpu *ip_rt_acct __read_mostly; |
c7066f70 | 2507 | #endif /* CONFIG_IP_ROUTE_CLASSID */ |
1da177e4 | 2508 | |
1da177e4 LT |
2509 | int __init ip_rt_init(void) |
2510 | { | |
424c4b70 | 2511 | int rc = 0; |
1da177e4 | 2512 | |
c7066f70 | 2513 | #ifdef CONFIG_IP_ROUTE_CLASSID |
0dcec8c2 | 2514 | ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct), __alignof__(struct ip_rt_acct)); |
1da177e4 LT |
2515 | if (!ip_rt_acct) |
2516 | panic("IP: failed to allocate ip_rt_acct\n"); | |
1da177e4 LT |
2517 | #endif |
2518 | ||
e5d679f3 AD |
2519 | ipv4_dst_ops.kmem_cachep = |
2520 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, | |
20c2df83 | 2521 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 | 2522 | |
14e50e57 DM |
2523 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
2524 | ||
fc66f95c ED |
2525 | if (dst_entries_init(&ipv4_dst_ops) < 0) |
2526 | panic("IP: failed to allocate ipv4_dst_ops counter\n"); | |
2527 | ||
2528 | if (dst_entries_init(&ipv4_dst_blackhole_ops) < 0) | |
2529 | panic("IP: failed to allocate ipv4_dst_blackhole_ops counter\n"); | |
2530 | ||
89aef892 DM |
2531 | ipv4_dst_ops.gc_thresh = ~0; |
2532 | ip_rt_max_size = INT_MAX; | |
1da177e4 | 2533 | |
1da177e4 LT |
2534 | devinet_init(); |
2535 | ip_fib_init(); | |
2536 | ||
73b38711 | 2537 | if (ip_rt_proc_init()) |
058bd4d2 | 2538 | pr_err("Unable to create route proc files\n"); |
1da177e4 LT |
2539 | #ifdef CONFIG_XFRM |
2540 | xfrm_init(); | |
a33bc5c1 | 2541 | xfrm4_init(ip_rt_max_size); |
1da177e4 | 2542 | #endif |
c7ac8679 | 2543 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL, NULL); |
63f3444f | 2544 | |
39a23e75 DL |
2545 | #ifdef CONFIG_SYSCTL |
2546 | register_pernet_subsys(&sysctl_route_ops); | |
2547 | #endif | |
3ee94372 | 2548 | register_pernet_subsys(&rt_genid_ops); |
c3426b47 | 2549 | register_pernet_subsys(&ipv4_inetpeer_ops); |
1da177e4 LT |
2550 | return rc; |
2551 | } | |
2552 | ||
a1bc6eb4 | 2553 | #ifdef CONFIG_SYSCTL |
eeb61f71 AV |
2554 | /* |
2555 | * We really need to sanitize the damn ipv4 init order, then all | |
2556 | * this nonsense will go away. | |
2557 | */ | |
2558 | void __init ip_static_sysctl_init(void) | |
2559 | { | |
4e5ca785 | 2560 | register_net_sysctl(&init_net, "net/ipv4/route", ipv4_route_table); |
eeb61f71 | 2561 | } |
a1bc6eb4 | 2562 | #endif |