Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * ROUTE - implementation of the IP router. | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
11 | * Linus Torvalds, <Linus.Torvalds@helsinki.fi> | |
12 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
13 | * | |
14 | * Fixes: | |
15 | * Alan Cox : Verify area fixes. | |
16 | * Alan Cox : cli() protects routing changes | |
17 | * Rui Oliveira : ICMP routing table updates | |
18 | * (rco@di.uminho.pt) Routing table insertion and update | |
19 | * Linus Torvalds : Rewrote bits to be sensible | |
20 | * Alan Cox : Added BSD route gw semantics | |
e905a9ed | 21 | * Alan Cox : Super /proc >4K |
1da177e4 LT |
22 | * Alan Cox : MTU in route table |
23 | * Alan Cox : MSS actually. Also added the window | |
24 | * clamper. | |
25 | * Sam Lantinga : Fixed route matching in rt_del() | |
26 | * Alan Cox : Routing cache support. | |
27 | * Alan Cox : Removed compatibility cruft. | |
28 | * Alan Cox : RTF_REJECT support. | |
29 | * Alan Cox : TCP irtt support. | |
30 | * Jonathan Naylor : Added Metric support. | |
31 | * Miquel van Smoorenburg : BSD API fixes. | |
32 | * Miquel van Smoorenburg : Metrics. | |
33 | * Alan Cox : Use __u32 properly | |
34 | * Alan Cox : Aligned routing errors more closely with BSD | |
35 | * our system is still very different. | |
36 | * Alan Cox : Faster /proc handling | |
37 | * Alexey Kuznetsov : Massive rework to support tree based routing, | |
38 | * routing caches and better behaviour. | |
e905a9ed | 39 | * |
1da177e4 LT |
40 | * Olaf Erb : irtt wasn't being copied right. |
41 | * Bjorn Ekwall : Kerneld route support. | |
42 | * Alan Cox : Multicast fixed (I hope) | |
43 | * Pavel Krauz : Limited broadcast fixed | |
44 | * Mike McLagan : Routing by source | |
45 | * Alexey Kuznetsov : End of old history. Split to fib.c and | |
46 | * route.c and rewritten from scratch. | |
47 | * Andi Kleen : Load-limit warning messages. | |
48 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. | |
49 | * Vitaly E. Lavrov : Race condition in ip_route_input_slow. | |
50 | * Tobias Ringstrom : Uninitialized res.type in ip_route_output_slow. | |
51 | * Vladimir V. Ivanov : IP rule info (flowid) is really useful. | |
52 | * Marc Boucher : routing by fwmark | |
53 | * Robert Olsson : Added rt_cache statistics | |
54 | * Arnaldo C. Melo : Convert proc stuff to seq_file | |
bb1d23b0 | 55 | * Eric Dumazet : hashed spinlocks and rt_check_expire() fixes. |
cef2685e IS |
56 | * Ilia Sotnikov : Ignore TOS on PMTUD and Redirect |
57 | * Ilia Sotnikov : Removed TOS from hash calculations | |
1da177e4 LT |
58 | * |
59 | * This program is free software; you can redistribute it and/or | |
60 | * modify it under the terms of the GNU General Public License | |
61 | * as published by the Free Software Foundation; either version | |
62 | * 2 of the License, or (at your option) any later version. | |
63 | */ | |
64 | ||
afd46503 JP |
65 | #define pr_fmt(fmt) "IPv4: " fmt |
66 | ||
1da177e4 | 67 | #include <linux/module.h> |
7c0f6ba6 | 68 | #include <linux/uaccess.h> |
1da177e4 LT |
69 | #include <linux/bitops.h> |
70 | #include <linux/types.h> | |
71 | #include <linux/kernel.h> | |
1da177e4 LT |
72 | #include <linux/mm.h> |
73 | #include <linux/string.h> | |
74 | #include <linux/socket.h> | |
75 | #include <linux/sockios.h> | |
76 | #include <linux/errno.h> | |
77 | #include <linux/in.h> | |
78 | #include <linux/inet.h> | |
79 | #include <linux/netdevice.h> | |
80 | #include <linux/proc_fs.h> | |
81 | #include <linux/init.h> | |
82 | #include <linux/skbuff.h> | |
1da177e4 LT |
83 | #include <linux/inetdevice.h> |
84 | #include <linux/igmp.h> | |
85 | #include <linux/pkt_sched.h> | |
86 | #include <linux/mroute.h> | |
87 | #include <linux/netfilter_ipv4.h> | |
88 | #include <linux/random.h> | |
1da177e4 LT |
89 | #include <linux/rcupdate.h> |
90 | #include <linux/times.h> | |
5a0e3ad6 | 91 | #include <linux/slab.h> |
73f156a6 | 92 | #include <linux/jhash.h> |
352e512c | 93 | #include <net/dst.h> |
1b7179d3 | 94 | #include <net/dst_metadata.h> |
457c4cbc | 95 | #include <net/net_namespace.h> |
1da177e4 LT |
96 | #include <net/protocol.h> |
97 | #include <net/ip.h> | |
98 | #include <net/route.h> | |
99 | #include <net/inetpeer.h> | |
100 | #include <net/sock.h> | |
101 | #include <net/ip_fib.h> | |
102 | #include <net/arp.h> | |
103 | #include <net/tcp.h> | |
104 | #include <net/icmp.h> | |
105 | #include <net/xfrm.h> | |
571e7226 | 106 | #include <net/lwtunnel.h> |
8d71740c | 107 | #include <net/netevent.h> |
63f3444f | 108 | #include <net/rtnetlink.h> |
1da177e4 LT |
109 | #ifdef CONFIG_SYSCTL |
110 | #include <linux/sysctl.h> | |
7426a564 | 111 | #include <linux/kmemleak.h> |
1da177e4 | 112 | #endif |
6e5714ea | 113 | #include <net/secure_seq.h> |
1b7179d3 | 114 | #include <net/ip_tunnels.h> |
385add90 | 115 | #include <net/l3mdev.h> |
1da177e4 | 116 | |
b6179813 RP |
117 | #include "fib_lookup.h" |
118 | ||
68a5e3dd | 119 | #define RT_FL_TOS(oldflp4) \ |
f61759e6 | 120 | ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK)) |
1da177e4 | 121 | |
1da177e4 LT |
122 | #define RT_GC_TIMEOUT (300*HZ) |
123 | ||
1da177e4 | 124 | static int ip_rt_max_size; |
817bc4db SH |
125 | static int ip_rt_redirect_number __read_mostly = 9; |
126 | static int ip_rt_redirect_load __read_mostly = HZ / 50; | |
127 | static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); | |
128 | static int ip_rt_error_cost __read_mostly = HZ; | |
129 | static int ip_rt_error_burst __read_mostly = 5 * HZ; | |
817bc4db | 130 | static int ip_rt_mtu_expires __read_mostly = 10 * 60 * HZ; |
3bcf69f8 | 131 | static u32 ip_rt_min_pmtu __read_mostly = 512 + 20 + 20; |
817bc4db | 132 | static int ip_rt_min_advmss __read_mostly = 256; |
9f28a2fc | 133 | |
deed49df | 134 | static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; |
3bcf69f8 SD |
135 | |
136 | static int ip_min_valid_pmtu __read_mostly = IPV4_MIN_MTU; | |
137 | ||
1da177e4 LT |
138 | /* |
139 | * Interface to generic destination cache. | |
140 | */ | |
141 | ||
142 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); | |
0dbaee3b | 143 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 144 | static unsigned int ipv4_mtu(const struct dst_entry *dst); |
1da177e4 LT |
145 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); |
146 | static void ipv4_link_failure(struct sk_buff *skb); | |
6700c270 DM |
147 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
148 | struct sk_buff *skb, u32 mtu); | |
149 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, | |
150 | struct sk_buff *skb); | |
caacf05e | 151 | static void ipv4_dst_destroy(struct dst_entry *dst); |
1da177e4 | 152 | |
62fa8a84 DM |
153 | static u32 *ipv4_cow_metrics(struct dst_entry *dst, unsigned long old) |
154 | { | |
31248731 DM |
155 | WARN_ON(1); |
156 | return NULL; | |
62fa8a84 DM |
157 | } |
158 | ||
f894cbf8 DM |
159 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
160 | struct sk_buff *skb, | |
161 | const void *daddr); | |
63fca65d | 162 | static void ipv4_confirm_neigh(const struct dst_entry *dst, const void *daddr); |
d3aaeb38 | 163 | |
1da177e4 LT |
164 | static struct dst_ops ipv4_dst_ops = { |
165 | .family = AF_INET, | |
1da177e4 | 166 | .check = ipv4_dst_check, |
0dbaee3b | 167 | .default_advmss = ipv4_default_advmss, |
ebb762f2 | 168 | .mtu = ipv4_mtu, |
62fa8a84 | 169 | .cow_metrics = ipv4_cow_metrics, |
caacf05e | 170 | .destroy = ipv4_dst_destroy, |
1da177e4 LT |
171 | .negative_advice = ipv4_negative_advice, |
172 | .link_failure = ipv4_link_failure, | |
173 | .update_pmtu = ip_rt_update_pmtu, | |
e47a185b | 174 | .redirect = ip_do_redirect, |
b92dacd4 | 175 | .local_out = __ip_local_out, |
d3aaeb38 | 176 | .neigh_lookup = ipv4_neigh_lookup, |
63fca65d | 177 | .confirm_neigh = ipv4_confirm_neigh, |
1da177e4 LT |
178 | }; |
179 | ||
180 | #define ECN_OR_COST(class) TC_PRIO_##class | |
181 | ||
4839c52b | 182 | const __u8 ip_tos2prio[16] = { |
1da177e4 | 183 | TC_PRIO_BESTEFFORT, |
4a2b9c37 | 184 | ECN_OR_COST(BESTEFFORT), |
1da177e4 LT |
185 | TC_PRIO_BESTEFFORT, |
186 | ECN_OR_COST(BESTEFFORT), | |
187 | TC_PRIO_BULK, | |
188 | ECN_OR_COST(BULK), | |
189 | TC_PRIO_BULK, | |
190 | ECN_OR_COST(BULK), | |
191 | TC_PRIO_INTERACTIVE, | |
192 | ECN_OR_COST(INTERACTIVE), | |
193 | TC_PRIO_INTERACTIVE, | |
194 | ECN_OR_COST(INTERACTIVE), | |
195 | TC_PRIO_INTERACTIVE_BULK, | |
196 | ECN_OR_COST(INTERACTIVE_BULK), | |
197 | TC_PRIO_INTERACTIVE_BULK, | |
198 | ECN_OR_COST(INTERACTIVE_BULK) | |
199 | }; | |
d4a96865 | 200 | EXPORT_SYMBOL(ip_tos2prio); |
1da177e4 | 201 | |
2f970d83 | 202 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
3ed66e91 | 203 | #define RT_CACHE_STAT_INC(field) raw_cpu_inc(rt_cache_stat.field) |
1da177e4 | 204 | |
1da177e4 | 205 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
206 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) |
207 | { | |
29e75252 | 208 | if (*pos) |
89aef892 | 209 | return NULL; |
29e75252 | 210 | return SEQ_START_TOKEN; |
1da177e4 LT |
211 | } |
212 | ||
213 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
214 | { | |
1da177e4 | 215 | ++*pos; |
89aef892 | 216 | return NULL; |
1da177e4 LT |
217 | } |
218 | ||
219 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) | |
220 | { | |
1da177e4 LT |
221 | } |
222 | ||
223 | static int rt_cache_seq_show(struct seq_file *seq, void *v) | |
224 | { | |
225 | if (v == SEQ_START_TOKEN) | |
226 | seq_printf(seq, "%-127s\n", | |
227 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" | |
228 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" | |
229 | "HHUptod\tSpecDst"); | |
e905a9ed | 230 | return 0; |
1da177e4 LT |
231 | } |
232 | ||
f690808e | 233 | static const struct seq_operations rt_cache_seq_ops = { |
1da177e4 LT |
234 | .start = rt_cache_seq_start, |
235 | .next = rt_cache_seq_next, | |
236 | .stop = rt_cache_seq_stop, | |
237 | .show = rt_cache_seq_show, | |
238 | }; | |
239 | ||
240 | static int rt_cache_seq_open(struct inode *inode, struct file *file) | |
241 | { | |
89aef892 | 242 | return seq_open(file, &rt_cache_seq_ops); |
1da177e4 LT |
243 | } |
244 | ||
9a32144e | 245 | static const struct file_operations rt_cache_seq_fops = { |
1da177e4 LT |
246 | .owner = THIS_MODULE, |
247 | .open = rt_cache_seq_open, | |
248 | .read = seq_read, | |
249 | .llseek = seq_lseek, | |
89aef892 | 250 | .release = seq_release, |
1da177e4 LT |
251 | }; |
252 | ||
253 | ||
254 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
255 | { | |
256 | int cpu; | |
257 | ||
258 | if (*pos == 0) | |
259 | return SEQ_START_TOKEN; | |
260 | ||
0f23174a | 261 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
262 | if (!cpu_possible(cpu)) |
263 | continue; | |
264 | *pos = cpu+1; | |
2f970d83 | 265 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
266 | } |
267 | return NULL; | |
268 | } | |
269 | ||
270 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
271 | { | |
272 | int cpu; | |
273 | ||
0f23174a | 274 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
275 | if (!cpu_possible(cpu)) |
276 | continue; | |
277 | *pos = cpu+1; | |
2f970d83 | 278 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
279 | } |
280 | return NULL; | |
e905a9ed | 281 | |
1da177e4 LT |
282 | } |
283 | ||
284 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) | |
285 | { | |
286 | ||
287 | } | |
288 | ||
289 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) | |
290 | { | |
291 | struct rt_cache_stat *st = v; | |
292 | ||
293 | if (v == SEQ_START_TOKEN) { | |
5bec0039 | 294 | 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 |
295 | return 0; |
296 | } | |
e905a9ed | 297 | |
1da177e4 LT |
298 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
299 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", | |
fc66f95c | 300 | dst_entries_get_slow(&ipv4_dst_ops), |
0baf2b35 | 301 | 0, /* st->in_hit */ |
1da177e4 LT |
302 | st->in_slow_tot, |
303 | st->in_slow_mc, | |
304 | st->in_no_route, | |
305 | st->in_brd, | |
306 | st->in_martian_dst, | |
307 | st->in_martian_src, | |
308 | ||
0baf2b35 | 309 | 0, /* st->out_hit */ |
1da177e4 | 310 | st->out_slow_tot, |
e905a9ed | 311 | st->out_slow_mc, |
1da177e4 | 312 | |
0baf2b35 ED |
313 | 0, /* st->gc_total */ |
314 | 0, /* st->gc_ignored */ | |
315 | 0, /* st->gc_goal_miss */ | |
316 | 0, /* st->gc_dst_overflow */ | |
317 | 0, /* st->in_hlist_search */ | |
318 | 0 /* st->out_hlist_search */ | |
1da177e4 LT |
319 | ); |
320 | return 0; | |
321 | } | |
322 | ||
f690808e | 323 | static const struct seq_operations rt_cpu_seq_ops = { |
1da177e4 LT |
324 | .start = rt_cpu_seq_start, |
325 | .next = rt_cpu_seq_next, | |
326 | .stop = rt_cpu_seq_stop, | |
327 | .show = rt_cpu_seq_show, | |
328 | }; | |
329 | ||
330 | ||
331 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) | |
332 | { | |
333 | return seq_open(file, &rt_cpu_seq_ops); | |
334 | } | |
335 | ||
9a32144e | 336 | static const struct file_operations rt_cpu_seq_fops = { |
1da177e4 LT |
337 | .owner = THIS_MODULE, |
338 | .open = rt_cpu_seq_open, | |
339 | .read = seq_read, | |
340 | .llseek = seq_lseek, | |
341 | .release = seq_release, | |
342 | }; | |
343 | ||
c7066f70 | 344 | #ifdef CONFIG_IP_ROUTE_CLASSID |
a661c419 | 345 | static int rt_acct_proc_show(struct seq_file *m, void *v) |
78c686e9 | 346 | { |
a661c419 AD |
347 | struct ip_rt_acct *dst, *src; |
348 | unsigned int i, j; | |
349 | ||
350 | dst = kcalloc(256, sizeof(struct ip_rt_acct), GFP_KERNEL); | |
351 | if (!dst) | |
352 | return -ENOMEM; | |
353 | ||
354 | for_each_possible_cpu(i) { | |
355 | src = (struct ip_rt_acct *)per_cpu_ptr(ip_rt_acct, i); | |
356 | for (j = 0; j < 256; j++) { | |
357 | dst[j].o_bytes += src[j].o_bytes; | |
358 | dst[j].o_packets += src[j].o_packets; | |
359 | dst[j].i_bytes += src[j].i_bytes; | |
360 | dst[j].i_packets += src[j].i_packets; | |
361 | } | |
78c686e9 PE |
362 | } |
363 | ||
a661c419 AD |
364 | seq_write(m, dst, 256 * sizeof(struct ip_rt_acct)); |
365 | kfree(dst); | |
366 | return 0; | |
367 | } | |
78c686e9 | 368 | |
a661c419 AD |
369 | static int rt_acct_proc_open(struct inode *inode, struct file *file) |
370 | { | |
371 | return single_open(file, rt_acct_proc_show, NULL); | |
78c686e9 | 372 | } |
a661c419 AD |
373 | |
374 | static const struct file_operations rt_acct_proc_fops = { | |
375 | .owner = THIS_MODULE, | |
376 | .open = rt_acct_proc_open, | |
377 | .read = seq_read, | |
378 | .llseek = seq_lseek, | |
379 | .release = single_release, | |
380 | }; | |
78c686e9 | 381 | #endif |
107f1634 | 382 | |
73b38711 | 383 | static int __net_init ip_rt_do_proc_init(struct net *net) |
107f1634 PE |
384 | { |
385 | struct proc_dir_entry *pde; | |
386 | ||
d4beaa66 G |
387 | pde = proc_create("rt_cache", S_IRUGO, net->proc_net, |
388 | &rt_cache_seq_fops); | |
107f1634 PE |
389 | if (!pde) |
390 | goto err1; | |
391 | ||
77020720 WC |
392 | pde = proc_create("rt_cache", S_IRUGO, |
393 | net->proc_net_stat, &rt_cpu_seq_fops); | |
107f1634 PE |
394 | if (!pde) |
395 | goto err2; | |
396 | ||
c7066f70 | 397 | #ifdef CONFIG_IP_ROUTE_CLASSID |
a661c419 | 398 | pde = proc_create("rt_acct", 0, net->proc_net, &rt_acct_proc_fops); |
107f1634 PE |
399 | if (!pde) |
400 | goto err3; | |
401 | #endif | |
402 | return 0; | |
403 | ||
c7066f70 | 404 | #ifdef CONFIG_IP_ROUTE_CLASSID |
107f1634 PE |
405 | err3: |
406 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
407 | #endif | |
408 | err2: | |
409 | remove_proc_entry("rt_cache", net->proc_net); | |
410 | err1: | |
411 | return -ENOMEM; | |
412 | } | |
73b38711 DL |
413 | |
414 | static void __net_exit ip_rt_do_proc_exit(struct net *net) | |
415 | { | |
416 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
417 | remove_proc_entry("rt_cache", net->proc_net); | |
c7066f70 | 418 | #ifdef CONFIG_IP_ROUTE_CLASSID |
73b38711 | 419 | remove_proc_entry("rt_acct", net->proc_net); |
0a931acf | 420 | #endif |
73b38711 DL |
421 | } |
422 | ||
423 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { | |
424 | .init = ip_rt_do_proc_init, | |
425 | .exit = ip_rt_do_proc_exit, | |
426 | }; | |
427 | ||
428 | static int __init ip_rt_proc_init(void) | |
429 | { | |
430 | return register_pernet_subsys(&ip_rt_proc_ops); | |
431 | } | |
432 | ||
107f1634 | 433 | #else |
73b38711 | 434 | static inline int ip_rt_proc_init(void) |
107f1634 PE |
435 | { |
436 | return 0; | |
437 | } | |
1da177e4 | 438 | #endif /* CONFIG_PROC_FS */ |
e905a9ed | 439 | |
4331debc | 440 | static inline bool rt_is_expired(const struct rtable *rth) |
e84f84f2 | 441 | { |
ca4c3fc2 | 442 | return rth->rt_genid != rt_genid_ipv4(dev_net(rth->dst.dev)); |
e84f84f2 DL |
443 | } |
444 | ||
4ccfe6d4 | 445 | void rt_cache_flush(struct net *net) |
1da177e4 | 446 | { |
ca4c3fc2 | 447 | rt_genid_bump_ipv4(net); |
98376387 ED |
448 | } |
449 | ||
f894cbf8 DM |
450 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
451 | struct sk_buff *skb, | |
452 | const void *daddr) | |
3769cffb | 453 | { |
d3aaeb38 DM |
454 | struct net_device *dev = dst->dev; |
455 | const __be32 *pkey = daddr; | |
39232973 | 456 | const struct rtable *rt; |
3769cffb DM |
457 | struct neighbour *n; |
458 | ||
39232973 | 459 | rt = (const struct rtable *) dst; |
a263b309 | 460 | if (rt->rt_gateway) |
39232973 | 461 | pkey = (const __be32 *) &rt->rt_gateway; |
f894cbf8 DM |
462 | else if (skb) |
463 | pkey = &ip_hdr(skb)->daddr; | |
d3aaeb38 | 464 | |
80703d26 | 465 | n = __ipv4_neigh_lookup(dev, *(__force u32 *)pkey); |
d3aaeb38 DM |
466 | if (n) |
467 | return n; | |
32092ecf | 468 | return neigh_create(&arp_tbl, pkey, dev); |
d3aaeb38 DM |
469 | } |
470 | ||
63fca65d JA |
471 | static void ipv4_confirm_neigh(const struct dst_entry *dst, const void *daddr) |
472 | { | |
473 | struct net_device *dev = dst->dev; | |
474 | const __be32 *pkey = daddr; | |
475 | const struct rtable *rt; | |
476 | ||
477 | rt = (const struct rtable *)dst; | |
478 | if (rt->rt_gateway) | |
479 | pkey = (const __be32 *)&rt->rt_gateway; | |
480 | else if (!daddr || | |
481 | (rt->rt_flags & | |
482 | (RTCF_MULTICAST | RTCF_BROADCAST | RTCF_LOCAL))) | |
483 | return; | |
484 | ||
485 | __ipv4_confirm_neigh(dev, *(__force u32 *)pkey); | |
486 | } | |
487 | ||
04ca6973 | 488 | #define IP_IDENTS_SZ 2048u |
04ca6973 | 489 | |
355b590c ED |
490 | static atomic_t *ip_idents __read_mostly; |
491 | static u32 *ip_tstamps __read_mostly; | |
04ca6973 ED |
492 | |
493 | /* In order to protect privacy, we add a perturbation to identifiers | |
494 | * if one generator is seldom used. This makes hard for an attacker | |
495 | * to infer how many packets were sent between two points in time. | |
496 | */ | |
497 | u32 ip_idents_reserve(u32 hash, int segs) | |
498 | { | |
355b590c ED |
499 | u32 *p_tstamp = ip_tstamps + hash % IP_IDENTS_SZ; |
500 | atomic_t *p_id = ip_idents + hash % IP_IDENTS_SZ; | |
501 | u32 old = ACCESS_ONCE(*p_tstamp); | |
04ca6973 | 502 | u32 now = (u32)jiffies; |
adb03115 | 503 | u32 new, delta = 0; |
04ca6973 | 504 | |
355b590c | 505 | if (old != now && cmpxchg(p_tstamp, old, now) == old) |
04ca6973 ED |
506 | delta = prandom_u32_max(now - old); |
507 | ||
adb03115 ED |
508 | /* Do not use atomic_add_return() as it makes UBSAN unhappy */ |
509 | do { | |
510 | old = (u32)atomic_read(p_id); | |
511 | new = old + delta + segs; | |
512 | } while (atomic_cmpxchg(p_id, old, new) != old); | |
513 | ||
514 | return new - segs; | |
04ca6973 ED |
515 | } |
516 | EXPORT_SYMBOL(ip_idents_reserve); | |
1da177e4 | 517 | |
b6a7719a | 518 | void __ip_select_ident(struct net *net, struct iphdr *iph, int segs) |
1da177e4 | 519 | { |
73f156a6 | 520 | u32 hash, id; |
1da177e4 | 521 | |
47aed2a9 ED |
522 | /* Note the following code is not safe, but this is okay. */ |
523 | if (unlikely(siphash_key_is_zero(&net->ipv4.ip_id_key))) | |
524 | get_random_bytes(&net->ipv4.ip_id_key, | |
525 | sizeof(net->ipv4.ip_id_key)); | |
1da177e4 | 526 | |
47aed2a9 | 527 | hash = siphash_3u32((__force u32)iph->daddr, |
04ca6973 | 528 | (__force u32)iph->saddr, |
47aed2a9 ED |
529 | iph->protocol, |
530 | &net->ipv4.ip_id_key); | |
73f156a6 ED |
531 | id = ip_idents_reserve(hash, segs); |
532 | iph->id = htons(id); | |
1da177e4 | 533 | } |
4bc2f18b | 534 | EXPORT_SYMBOL(__ip_select_ident); |
1da177e4 | 535 | |
e2d118a1 LC |
536 | static void __build_flow_key(const struct net *net, struct flowi4 *fl4, |
537 | const struct sock *sk, | |
4895c771 DM |
538 | const struct iphdr *iph, |
539 | int oif, u8 tos, | |
540 | u8 prot, u32 mark, int flow_flags) | |
541 | { | |
542 | if (sk) { | |
543 | const struct inet_sock *inet = inet_sk(sk); | |
544 | ||
545 | oif = sk->sk_bound_dev_if; | |
546 | mark = sk->sk_mark; | |
547 | tos = RT_CONN_FLAGS(sk); | |
548 | prot = inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol; | |
549 | } | |
550 | flowi4_init_output(fl4, oif, mark, tos, | |
551 | RT_SCOPE_UNIVERSE, prot, | |
552 | flow_flags, | |
e2d118a1 LC |
553 | iph->daddr, iph->saddr, 0, 0, |
554 | sock_net_uid(net, sk)); | |
4895c771 DM |
555 | } |
556 | ||
5abf7f7e ED |
557 | static void build_skb_flow_key(struct flowi4 *fl4, const struct sk_buff *skb, |
558 | const struct sock *sk) | |
4895c771 | 559 | { |
d109e61b | 560 | const struct net *net = dev_net(skb->dev); |
4895c771 DM |
561 | const struct iphdr *iph = ip_hdr(skb); |
562 | int oif = skb->dev->ifindex; | |
563 | u8 tos = RT_TOS(iph->tos); | |
564 | u8 prot = iph->protocol; | |
565 | u32 mark = skb->mark; | |
566 | ||
d109e61b | 567 | __build_flow_key(net, fl4, sk, iph, oif, tos, prot, mark, 0); |
4895c771 DM |
568 | } |
569 | ||
5abf7f7e | 570 | static void build_sk_flow_key(struct flowi4 *fl4, const struct sock *sk) |
4895c771 DM |
571 | { |
572 | const struct inet_sock *inet = inet_sk(sk); | |
5abf7f7e | 573 | const struct ip_options_rcu *inet_opt; |
4895c771 DM |
574 | __be32 daddr = inet->inet_daddr; |
575 | ||
576 | rcu_read_lock(); | |
577 | inet_opt = rcu_dereference(inet->inet_opt); | |
578 | if (inet_opt && inet_opt->opt.srr) | |
579 | daddr = inet_opt->opt.faddr; | |
580 | flowi4_init_output(fl4, sk->sk_bound_dev_if, sk->sk_mark, | |
581 | RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, | |
582 | inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol, | |
583 | inet_sk_flowi_flags(sk), | |
e2d118a1 | 584 | daddr, inet->inet_saddr, 0, 0, sk->sk_uid); |
4895c771 DM |
585 | rcu_read_unlock(); |
586 | } | |
587 | ||
5abf7f7e ED |
588 | static void ip_rt_build_flow_key(struct flowi4 *fl4, const struct sock *sk, |
589 | const struct sk_buff *skb) | |
4895c771 DM |
590 | { |
591 | if (skb) | |
592 | build_skb_flow_key(fl4, skb, sk); | |
593 | else | |
594 | build_sk_flow_key(fl4, sk); | |
595 | } | |
596 | ||
c5038a83 | 597 | static DEFINE_SPINLOCK(fnhe_lock); |
4895c771 | 598 | |
2ffae99d TT |
599 | static void fnhe_flush_routes(struct fib_nh_exception *fnhe) |
600 | { | |
601 | struct rtable *rt; | |
602 | ||
603 | rt = rcu_dereference(fnhe->fnhe_rth_input); | |
604 | if (rt) { | |
605 | RCU_INIT_POINTER(fnhe->fnhe_rth_input, NULL); | |
95c47f9c | 606 | dst_dev_put(&rt->dst); |
0830106c | 607 | dst_release(&rt->dst); |
2ffae99d TT |
608 | } |
609 | rt = rcu_dereference(fnhe->fnhe_rth_output); | |
610 | if (rt) { | |
611 | RCU_INIT_POINTER(fnhe->fnhe_rth_output, NULL); | |
95c47f9c | 612 | dst_dev_put(&rt->dst); |
0830106c | 613 | dst_release(&rt->dst); |
2ffae99d TT |
614 | } |
615 | } | |
616 | ||
aee06da6 | 617 | static struct fib_nh_exception *fnhe_oldest(struct fnhe_hash_bucket *hash) |
4895c771 DM |
618 | { |
619 | struct fib_nh_exception *fnhe, *oldest; | |
620 | ||
621 | oldest = rcu_dereference(hash->chain); | |
622 | for (fnhe = rcu_dereference(oldest->fnhe_next); fnhe; | |
623 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
624 | if (time_before(fnhe->fnhe_stamp, oldest->fnhe_stamp)) | |
625 | oldest = fnhe; | |
626 | } | |
2ffae99d | 627 | fnhe_flush_routes(oldest); |
4895c771 DM |
628 | return oldest; |
629 | } | |
630 | ||
d3a25c98 DM |
631 | static inline u32 fnhe_hashfun(__be32 daddr) |
632 | { | |
d546c621 | 633 | static u32 fnhe_hashrnd __read_mostly; |
d3a25c98 DM |
634 | u32 hval; |
635 | ||
d546c621 ED |
636 | net_get_random_once(&fnhe_hashrnd, sizeof(fnhe_hashrnd)); |
637 | hval = jhash_1word((__force u32) daddr, fnhe_hashrnd); | |
638 | return hash_32(hval, FNHE_HASH_SHIFT); | |
d3a25c98 DM |
639 | } |
640 | ||
387aa65a TT |
641 | static void fill_route_from_fnhe(struct rtable *rt, struct fib_nh_exception *fnhe) |
642 | { | |
643 | rt->rt_pmtu = fnhe->fnhe_pmtu; | |
8387fbac | 644 | rt->rt_mtu_locked = fnhe->fnhe_mtu_locked; |
387aa65a TT |
645 | rt->dst.expires = fnhe->fnhe_expires; |
646 | ||
647 | if (fnhe->fnhe_gw) { | |
648 | rt->rt_flags |= RTCF_REDIRECTED; | |
649 | rt->rt_gateway = fnhe->fnhe_gw; | |
650 | rt->rt_uses_gateway = 1; | |
651 | } | |
652 | } | |
653 | ||
aee06da6 | 654 | static void update_or_create_fnhe(struct fib_nh *nh, __be32 daddr, __be32 gw, |
8387fbac | 655 | u32 pmtu, bool lock, unsigned long expires) |
4895c771 | 656 | { |
aee06da6 | 657 | struct fnhe_hash_bucket *hash; |
4895c771 | 658 | struct fib_nh_exception *fnhe; |
387aa65a | 659 | struct rtable *rt; |
407de7d9 | 660 | u32 genid, hval; |
387aa65a | 661 | unsigned int i; |
4895c771 | 662 | int depth; |
407de7d9 XL |
663 | |
664 | genid = fnhe_genid(dev_net(nh->nh_dev)); | |
665 | hval = fnhe_hashfun(daddr); | |
aee06da6 | 666 | |
c5038a83 | 667 | spin_lock_bh(&fnhe_lock); |
4895c771 | 668 | |
caa41527 | 669 | hash = rcu_dereference(nh->nh_exceptions); |
4895c771 | 670 | if (!hash) { |
aee06da6 | 671 | hash = kzalloc(FNHE_HASH_SIZE * sizeof(*hash), GFP_ATOMIC); |
4895c771 | 672 | if (!hash) |
aee06da6 | 673 | goto out_unlock; |
caa41527 | 674 | rcu_assign_pointer(nh->nh_exceptions, hash); |
4895c771 DM |
675 | } |
676 | ||
4895c771 DM |
677 | hash += hval; |
678 | ||
679 | depth = 0; | |
680 | for (fnhe = rcu_dereference(hash->chain); fnhe; | |
681 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
682 | if (fnhe->fnhe_daddr == daddr) | |
aee06da6 | 683 | break; |
4895c771 DM |
684 | depth++; |
685 | } | |
686 | ||
aee06da6 | 687 | if (fnhe) { |
407de7d9 XL |
688 | if (fnhe->fnhe_genid != genid) |
689 | fnhe->fnhe_genid = genid; | |
aee06da6 JA |
690 | if (gw) |
691 | fnhe->fnhe_gw = gw; | |
8387fbac | 692 | if (pmtu) { |
aee06da6 | 693 | fnhe->fnhe_pmtu = pmtu; |
8387fbac SD |
694 | fnhe->fnhe_mtu_locked = lock; |
695 | } | |
ad199b18 | 696 | fnhe->fnhe_expires = max(1UL, expires); |
387aa65a | 697 | /* Update all cached dsts too */ |
2ffae99d TT |
698 | rt = rcu_dereference(fnhe->fnhe_rth_input); |
699 | if (rt) | |
700 | fill_route_from_fnhe(rt, fnhe); | |
701 | rt = rcu_dereference(fnhe->fnhe_rth_output); | |
387aa65a TT |
702 | if (rt) |
703 | fill_route_from_fnhe(rt, fnhe); | |
aee06da6 JA |
704 | } else { |
705 | if (depth > FNHE_RECLAIM_DEPTH) | |
706 | fnhe = fnhe_oldest(hash); | |
707 | else { | |
708 | fnhe = kzalloc(sizeof(*fnhe), GFP_ATOMIC); | |
709 | if (!fnhe) | |
710 | goto out_unlock; | |
711 | ||
712 | fnhe->fnhe_next = hash->chain; | |
713 | rcu_assign_pointer(hash->chain, fnhe); | |
714 | } | |
407de7d9 | 715 | fnhe->fnhe_genid = genid; |
aee06da6 JA |
716 | fnhe->fnhe_daddr = daddr; |
717 | fnhe->fnhe_gw = gw; | |
718 | fnhe->fnhe_pmtu = pmtu; | |
8387fbac | 719 | fnhe->fnhe_mtu_locked = lock; |
c751af52 | 720 | fnhe->fnhe_expires = max(1UL, expires); |
387aa65a TT |
721 | |
722 | /* Exception created; mark the cached routes for the nexthop | |
723 | * stale, so anyone caching it rechecks if this exception | |
724 | * applies to them. | |
725 | */ | |
2ffae99d TT |
726 | rt = rcu_dereference(nh->nh_rth_input); |
727 | if (rt) | |
728 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
729 | ||
387aa65a TT |
730 | for_each_possible_cpu(i) { |
731 | struct rtable __rcu **prt; | |
732 | prt = per_cpu_ptr(nh->nh_pcpu_rth_output, i); | |
733 | rt = rcu_dereference(*prt); | |
734 | if (rt) | |
735 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
736 | } | |
4895c771 | 737 | } |
4895c771 | 738 | |
4895c771 | 739 | fnhe->fnhe_stamp = jiffies; |
aee06da6 JA |
740 | |
741 | out_unlock: | |
c5038a83 | 742 | spin_unlock_bh(&fnhe_lock); |
4895c771 DM |
743 | } |
744 | ||
ceb33206 DM |
745 | static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flowi4 *fl4, |
746 | bool kill_route) | |
1da177e4 | 747 | { |
e47a185b | 748 | __be32 new_gw = icmp_hdr(skb)->un.gateway; |
94206125 | 749 | __be32 old_gw = ip_hdr(skb)->saddr; |
e47a185b | 750 | struct net_device *dev = skb->dev; |
e47a185b | 751 | struct in_device *in_dev; |
4895c771 | 752 | struct fib_result res; |
e47a185b | 753 | struct neighbour *n; |
317805b8 | 754 | struct net *net; |
1da177e4 | 755 | |
94206125 DM |
756 | switch (icmp_hdr(skb)->code & 7) { |
757 | case ICMP_REDIR_NET: | |
758 | case ICMP_REDIR_NETTOS: | |
759 | case ICMP_REDIR_HOST: | |
760 | case ICMP_REDIR_HOSTTOS: | |
761 | break; | |
762 | ||
763 | default: | |
764 | return; | |
765 | } | |
766 | ||
e47a185b DM |
767 | if (rt->rt_gateway != old_gw) |
768 | return; | |
769 | ||
770 | in_dev = __in_dev_get_rcu(dev); | |
771 | if (!in_dev) | |
772 | return; | |
773 | ||
c346dca1 | 774 | net = dev_net(dev); |
9d4fb27d JP |
775 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) || |
776 | ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) || | |
777 | ipv4_is_zeronet(new_gw)) | |
1da177e4 LT |
778 | goto reject_redirect; |
779 | ||
780 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { | |
781 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) | |
782 | goto reject_redirect; | |
783 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) | |
784 | goto reject_redirect; | |
785 | } else { | |
317805b8 | 786 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
1da177e4 LT |
787 | goto reject_redirect; |
788 | } | |
789 | ||
969447f2 SSL |
790 | n = __ipv4_neigh_lookup(rt->dst.dev, new_gw); |
791 | if (!n) | |
792 | n = neigh_create(&arp_tbl, &new_gw, rt->dst.dev); | |
2c1a4311 | 793 | if (!IS_ERR(n)) { |
e47a185b DM |
794 | if (!(n->nud_state & NUD_VALID)) { |
795 | neigh_event_send(n, NULL); | |
796 | } else { | |
0eeb075f | 797 | if (fib_lookup(net, fl4, &res, 0) == 0) { |
4895c771 | 798 | struct fib_nh *nh = &FIB_RES_NH(res); |
4895c771 | 799 | |
aee06da6 | 800 | update_or_create_fnhe(nh, fl4->daddr, new_gw, |
8387fbac SD |
801 | 0, false, |
802 | jiffies + ip_rt_gc_timeout); | |
4895c771 | 803 | } |
ceb33206 DM |
804 | if (kill_route) |
805 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
e47a185b DM |
806 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n); |
807 | } | |
808 | neigh_release(n); | |
809 | } | |
810 | return; | |
811 | ||
812 | reject_redirect: | |
813 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
99ee038d DM |
814 | if (IN_DEV_LOG_MARTIANS(in_dev)) { |
815 | const struct iphdr *iph = (const struct iphdr *) skb->data; | |
816 | __be32 daddr = iph->daddr; | |
817 | __be32 saddr = iph->saddr; | |
818 | ||
e47a185b DM |
819 | net_info_ratelimited("Redirect from %pI4 on %s about %pI4 ignored\n" |
820 | " Advised path = %pI4 -> %pI4\n", | |
821 | &old_gw, dev->name, &new_gw, | |
822 | &saddr, &daddr); | |
99ee038d | 823 | } |
e47a185b DM |
824 | #endif |
825 | ; | |
826 | } | |
827 | ||
4895c771 DM |
828 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
829 | { | |
830 | struct rtable *rt; | |
831 | struct flowi4 fl4; | |
f96ef988 | 832 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
7d995694 | 833 | struct net *net = dev_net(skb->dev); |
f96ef988 MK |
834 | int oif = skb->dev->ifindex; |
835 | u8 tos = RT_TOS(iph->tos); | |
836 | u8 prot = iph->protocol; | |
837 | u32 mark = skb->mark; | |
4895c771 DM |
838 | |
839 | rt = (struct rtable *) dst; | |
840 | ||
7d995694 | 841 | __build_flow_key(net, &fl4, sk, iph, oif, tos, prot, mark, 0); |
ceb33206 | 842 | __ip_do_redirect(rt, skb, &fl4, true); |
4895c771 DM |
843 | } |
844 | ||
1da177e4 LT |
845 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) |
846 | { | |
ee6b9673 | 847 | struct rtable *rt = (struct rtable *)dst; |
1da177e4 LT |
848 | struct dst_entry *ret = dst; |
849 | ||
850 | if (rt) { | |
d11a4dc1 | 851 | if (dst->obsolete > 0) { |
1da177e4 LT |
852 | ip_rt_put(rt); |
853 | ret = NULL; | |
5943634f DM |
854 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || |
855 | rt->dst.expires) { | |
89aef892 | 856 | ip_rt_put(rt); |
1da177e4 LT |
857 | ret = NULL; |
858 | } | |
859 | } | |
860 | return ret; | |
861 | } | |
862 | ||
863 | /* | |
864 | * Algorithm: | |
865 | * 1. The first ip_rt_redirect_number redirects are sent | |
866 | * with exponential backoff, then we stop sending them at all, | |
867 | * assuming that the host ignores our redirects. | |
868 | * 2. If we did not see packets requiring redirects | |
869 | * during ip_rt_redirect_silence, we assume that the host | |
870 | * forgot redirected route and start to send redirects again. | |
871 | * | |
872 | * This algorithm is much cheaper and more intelligent than dumb load limiting | |
873 | * in icmp.c. | |
874 | * | |
875 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) | |
876 | * and "frag. need" (breaks PMTU discovery) in icmp.c. | |
877 | */ | |
878 | ||
879 | void ip_rt_send_redirect(struct sk_buff *skb) | |
880 | { | |
511c3f92 | 881 | struct rtable *rt = skb_rtable(skb); |
30038fc6 | 882 | struct in_device *in_dev; |
92d86829 | 883 | struct inet_peer *peer; |
1d861aa4 | 884 | struct net *net; |
30038fc6 | 885 | int log_martians; |
192132b9 | 886 | int vif; |
1da177e4 | 887 | |
30038fc6 | 888 | rcu_read_lock(); |
d8d1f30b | 889 | in_dev = __in_dev_get_rcu(rt->dst.dev); |
30038fc6 ED |
890 | if (!in_dev || !IN_DEV_TX_REDIRECTS(in_dev)) { |
891 | rcu_read_unlock(); | |
1da177e4 | 892 | return; |
30038fc6 ED |
893 | } |
894 | log_martians = IN_DEV_LOG_MARTIANS(in_dev); | |
385add90 | 895 | vif = l3mdev_master_ifindex_rcu(rt->dst.dev); |
30038fc6 | 896 | rcu_read_unlock(); |
1da177e4 | 897 | |
1d861aa4 | 898 | net = dev_net(rt->dst.dev); |
192132b9 | 899 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, vif, 1); |
92d86829 | 900 | if (!peer) { |
e81da0e1 JA |
901 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, |
902 | rt_nexthop(rt, ip_hdr(skb)->daddr)); | |
92d86829 DM |
903 | return; |
904 | } | |
905 | ||
1da177e4 LT |
906 | /* No redirected packets during ip_rt_redirect_silence; |
907 | * reset the algorithm. | |
908 | */ | |
4e4d02b9 | 909 | if (time_after(jiffies, peer->rate_last + ip_rt_redirect_silence)) { |
92d86829 | 910 | peer->rate_tokens = 0; |
4e4d02b9 LB |
911 | peer->n_redirects = 0; |
912 | } | |
1da177e4 LT |
913 | |
914 | /* Too many ignored redirects; do not send anything | |
d8d1f30b | 915 | * set dst.rate_last to the last seen redirected packet. |
1da177e4 | 916 | */ |
4e4d02b9 | 917 | if (peer->n_redirects >= ip_rt_redirect_number) { |
92d86829 | 918 | peer->rate_last = jiffies; |
1d861aa4 | 919 | goto out_put_peer; |
1da177e4 LT |
920 | } |
921 | ||
922 | /* Check for load limit; set rate_last to the latest sent | |
923 | * redirect. | |
924 | */ | |
92d86829 | 925 | if (peer->rate_tokens == 0 || |
14fb8a76 | 926 | time_after(jiffies, |
92d86829 DM |
927 | (peer->rate_last + |
928 | (ip_rt_redirect_load << peer->rate_tokens)))) { | |
e81da0e1 JA |
929 | __be32 gw = rt_nexthop(rt, ip_hdr(skb)->daddr); |
930 | ||
931 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, gw); | |
92d86829 DM |
932 | peer->rate_last = jiffies; |
933 | ++peer->rate_tokens; | |
4e4d02b9 | 934 | ++peer->n_redirects; |
1da177e4 | 935 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
30038fc6 | 936 | if (log_martians && |
e87cc472 JP |
937 | peer->rate_tokens == ip_rt_redirect_number) |
938 | net_warn_ratelimited("host %pI4/if%d ignores redirects for %pI4 to %pI4\n", | |
92101b3b | 939 | &ip_hdr(skb)->saddr, inet_iif(skb), |
e81da0e1 | 940 | &ip_hdr(skb)->daddr, &gw); |
1da177e4 LT |
941 | #endif |
942 | } | |
1d861aa4 DM |
943 | out_put_peer: |
944 | inet_putpeer(peer); | |
1da177e4 LT |
945 | } |
946 | ||
947 | static int ip_error(struct sk_buff *skb) | |
948 | { | |
251da413 | 949 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
511c3f92 | 950 | struct rtable *rt = skb_rtable(skb); |
92d86829 | 951 | struct inet_peer *peer; |
1da177e4 | 952 | unsigned long now; |
251da413 | 953 | struct net *net; |
92d86829 | 954 | bool send; |
1da177e4 LT |
955 | int code; |
956 | ||
381c759d EB |
957 | /* IP on this device is disabled. */ |
958 | if (!in_dev) | |
959 | goto out; | |
960 | ||
251da413 DM |
961 | net = dev_net(rt->dst.dev); |
962 | if (!IN_DEV_FORWARD(in_dev)) { | |
963 | switch (rt->dst.error) { | |
964 | case EHOSTUNREACH: | |
b45386ef | 965 | __IP_INC_STATS(net, IPSTATS_MIB_INADDRERRORS); |
251da413 DM |
966 | break; |
967 | ||
968 | case ENETUNREACH: | |
b45386ef | 969 | __IP_INC_STATS(net, IPSTATS_MIB_INNOROUTES); |
251da413 DM |
970 | break; |
971 | } | |
972 | goto out; | |
973 | } | |
974 | ||
d8d1f30b | 975 | switch (rt->dst.error) { |
4500ebf8 JP |
976 | case EINVAL: |
977 | default: | |
978 | goto out; | |
979 | case EHOSTUNREACH: | |
980 | code = ICMP_HOST_UNREACH; | |
981 | break; | |
982 | case ENETUNREACH: | |
983 | code = ICMP_NET_UNREACH; | |
b45386ef | 984 | __IP_INC_STATS(net, IPSTATS_MIB_INNOROUTES); |
4500ebf8 JP |
985 | break; |
986 | case EACCES: | |
987 | code = ICMP_PKT_FILTERED; | |
988 | break; | |
1da177e4 LT |
989 | } |
990 | ||
192132b9 | 991 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, |
385add90 | 992 | l3mdev_master_ifindex(skb->dev), 1); |
92d86829 DM |
993 | |
994 | send = true; | |
995 | if (peer) { | |
996 | now = jiffies; | |
997 | peer->rate_tokens += now - peer->rate_last; | |
998 | if (peer->rate_tokens > ip_rt_error_burst) | |
999 | peer->rate_tokens = ip_rt_error_burst; | |
1000 | peer->rate_last = now; | |
1001 | if (peer->rate_tokens >= ip_rt_error_cost) | |
1002 | peer->rate_tokens -= ip_rt_error_cost; | |
1003 | else | |
1004 | send = false; | |
1d861aa4 | 1005 | inet_putpeer(peer); |
1da177e4 | 1006 | } |
92d86829 DM |
1007 | if (send) |
1008 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); | |
1da177e4 LT |
1009 | |
1010 | out: kfree_skb(skb); | |
1011 | return 0; | |
e905a9ed | 1012 | } |
1da177e4 | 1013 | |
d851c12b | 1014 | static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu) |
1da177e4 | 1015 | { |
d851c12b | 1016 | struct dst_entry *dst = &rt->dst; |
4895c771 | 1017 | struct fib_result res; |
8387fbac | 1018 | bool lock = false; |
2c8cec5c | 1019 | |
8387fbac | 1020 | if (ip_mtu_locked(dst)) |
fa1e492a SK |
1021 | return; |
1022 | ||
cb6ccf09 | 1023 | if (ipv4_mtu(dst) < mtu) |
3cdaa5be LW |
1024 | return; |
1025 | ||
8387fbac SD |
1026 | if (mtu < ip_rt_min_pmtu) { |
1027 | lock = true; | |
5943634f | 1028 | mtu = ip_rt_min_pmtu; |
8387fbac | 1029 | } |
2c8cec5c | 1030 | |
f016229e TT |
1031 | if (rt->rt_pmtu == mtu && |
1032 | time_before(jiffies, dst->expires - ip_rt_mtu_expires / 2)) | |
1033 | return; | |
1034 | ||
c5ae7d41 | 1035 | rcu_read_lock(); |
0eeb075f | 1036 | if (fib_lookup(dev_net(dst->dev), fl4, &res, 0) == 0) { |
4895c771 | 1037 | struct fib_nh *nh = &FIB_RES_NH(res); |
4895c771 | 1038 | |
8387fbac | 1039 | update_or_create_fnhe(nh, fl4->daddr, 0, mtu, lock, |
aee06da6 | 1040 | jiffies + ip_rt_mtu_expires); |
4895c771 | 1041 | } |
c5ae7d41 | 1042 | rcu_read_unlock(); |
1da177e4 LT |
1043 | } |
1044 | ||
4895c771 DM |
1045 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1046 | struct sk_buff *skb, u32 mtu) | |
1047 | { | |
1048 | struct rtable *rt = (struct rtable *) dst; | |
1049 | struct flowi4 fl4; | |
1050 | ||
1051 | ip_rt_build_flow_key(&fl4, sk, skb); | |
d851c12b | 1052 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
4895c771 DM |
1053 | } |
1054 | ||
36393395 DM |
1055 | void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, |
1056 | int oif, u32 mark, u8 protocol, int flow_flags) | |
1057 | { | |
4895c771 | 1058 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
36393395 DM |
1059 | struct flowi4 fl4; |
1060 | struct rtable *rt; | |
1061 | ||
1b3c61dc LC |
1062 | if (!mark) |
1063 | mark = IP4_REPLY_MARK(net, skb->mark); | |
1064 | ||
e2d118a1 | 1065 | __build_flow_key(net, &fl4, NULL, iph, oif, |
4895c771 | 1066 | RT_TOS(iph->tos), protocol, mark, flow_flags); |
36393395 DM |
1067 | rt = __ip_route_output_key(net, &fl4); |
1068 | if (!IS_ERR(rt)) { | |
4895c771 | 1069 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
36393395 DM |
1070 | ip_rt_put(rt); |
1071 | } | |
1072 | } | |
1073 | EXPORT_SYMBOL_GPL(ipv4_update_pmtu); | |
1074 | ||
9cb3a50c | 1075 | static void __ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) |
36393395 | 1076 | { |
4895c771 DM |
1077 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
1078 | struct flowi4 fl4; | |
1079 | struct rtable *rt; | |
36393395 | 1080 | |
e2d118a1 | 1081 | __build_flow_key(sock_net(sk), &fl4, sk, iph, 0, 0, 0, 0, 0); |
1b3c61dc LC |
1082 | |
1083 | if (!fl4.flowi4_mark) | |
1084 | fl4.flowi4_mark = IP4_REPLY_MARK(sock_net(sk), skb->mark); | |
1085 | ||
4895c771 DM |
1086 | rt = __ip_route_output_key(sock_net(sk), &fl4); |
1087 | if (!IS_ERR(rt)) { | |
1088 | __ip_rt_update_pmtu(rt, &fl4, mtu); | |
1089 | ip_rt_put(rt); | |
1090 | } | |
36393395 | 1091 | } |
9cb3a50c SK |
1092 | |
1093 | void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) | |
1094 | { | |
1095 | const struct iphdr *iph = (const struct iphdr *) skb->data; | |
1096 | struct flowi4 fl4; | |
1097 | struct rtable *rt; | |
7f502361 | 1098 | struct dst_entry *odst = NULL; |
b44108db | 1099 | bool new = false; |
e2d118a1 | 1100 | struct net *net = sock_net(sk); |
9cb3a50c SK |
1101 | |
1102 | bh_lock_sock(sk); | |
482fc609 HFS |
1103 | |
1104 | if (!ip_sk_accept_pmtu(sk)) | |
1105 | goto out; | |
1106 | ||
7f502361 | 1107 | odst = sk_dst_get(sk); |
9cb3a50c | 1108 | |
7f502361 | 1109 | if (sock_owned_by_user(sk) || !odst) { |
9cb3a50c SK |
1110 | __ipv4_sk_update_pmtu(skb, sk, mtu); |
1111 | goto out; | |
1112 | } | |
1113 | ||
e2d118a1 | 1114 | __build_flow_key(net, &fl4, sk, iph, 0, 0, 0, 0, 0); |
9cb3a50c | 1115 | |
7f502361 | 1116 | rt = (struct rtable *)odst; |
51456b29 | 1117 | if (odst->obsolete && !odst->ops->check(odst, 0)) { |
9cb3a50c SK |
1118 | rt = ip_route_output_flow(sock_net(sk), &fl4, sk); |
1119 | if (IS_ERR(rt)) | |
1120 | goto out; | |
b44108db SK |
1121 | |
1122 | new = true; | |
9cb3a50c SK |
1123 | } |
1124 | ||
1125 | __ip_rt_update_pmtu((struct rtable *) rt->dst.path, &fl4, mtu); | |
1126 | ||
7f502361 | 1127 | if (!dst_check(&rt->dst, 0)) { |
b44108db SK |
1128 | if (new) |
1129 | dst_release(&rt->dst); | |
1130 | ||
9cb3a50c SK |
1131 | rt = ip_route_output_flow(sock_net(sk), &fl4, sk); |
1132 | if (IS_ERR(rt)) | |
1133 | goto out; | |
1134 | ||
b44108db | 1135 | new = true; |
9cb3a50c SK |
1136 | } |
1137 | ||
b44108db | 1138 | if (new) |
7f502361 | 1139 | sk_dst_set(sk, &rt->dst); |
9cb3a50c SK |
1140 | |
1141 | out: | |
1142 | bh_unlock_sock(sk); | |
7f502361 | 1143 | dst_release(odst); |
9cb3a50c | 1144 | } |
36393395 | 1145 | EXPORT_SYMBOL_GPL(ipv4_sk_update_pmtu); |
f39925db | 1146 | |
b42597e2 DM |
1147 | void ipv4_redirect(struct sk_buff *skb, struct net *net, |
1148 | int oif, u32 mark, u8 protocol, int flow_flags) | |
1149 | { | |
4895c771 | 1150 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
b42597e2 DM |
1151 | struct flowi4 fl4; |
1152 | struct rtable *rt; | |
1153 | ||
e2d118a1 | 1154 | __build_flow_key(net, &fl4, NULL, iph, oif, |
4895c771 | 1155 | RT_TOS(iph->tos), protocol, mark, flow_flags); |
b42597e2 DM |
1156 | rt = __ip_route_output_key(net, &fl4); |
1157 | if (!IS_ERR(rt)) { | |
ceb33206 | 1158 | __ip_do_redirect(rt, skb, &fl4, false); |
b42597e2 DM |
1159 | ip_rt_put(rt); |
1160 | } | |
1161 | } | |
1162 | EXPORT_SYMBOL_GPL(ipv4_redirect); | |
1163 | ||
1164 | void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk) | |
1165 | { | |
4895c771 DM |
1166 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
1167 | struct flowi4 fl4; | |
1168 | struct rtable *rt; | |
e2d118a1 | 1169 | struct net *net = sock_net(sk); |
b42597e2 | 1170 | |
e2d118a1 LC |
1171 | __build_flow_key(net, &fl4, sk, iph, 0, 0, 0, 0, 0); |
1172 | rt = __ip_route_output_key(net, &fl4); | |
4895c771 | 1173 | if (!IS_ERR(rt)) { |
ceb33206 | 1174 | __ip_do_redirect(rt, skb, &fl4, false); |
4895c771 DM |
1175 | ip_rt_put(rt); |
1176 | } | |
b42597e2 DM |
1177 | } |
1178 | EXPORT_SYMBOL_GPL(ipv4_sk_redirect); | |
1179 | ||
efbc368d DM |
1180 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) |
1181 | { | |
1182 | struct rtable *rt = (struct rtable *) dst; | |
1183 | ||
ceb33206 DM |
1184 | /* All IPV4 dsts are created with ->obsolete set to the value |
1185 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1186 | * into this function always. | |
1187 | * | |
387aa65a TT |
1188 | * When a PMTU/redirect information update invalidates a route, |
1189 | * this is indicated by setting obsolete to DST_OBSOLETE_KILL or | |
1190 | * DST_OBSOLETE_DEAD by dst_free(). | |
ceb33206 | 1191 | */ |
387aa65a | 1192 | if (dst->obsolete != DST_OBSOLETE_FORCE_CHK || rt_is_expired(rt)) |
efbc368d | 1193 | return NULL; |
d11a4dc1 | 1194 | return dst; |
1da177e4 LT |
1195 | } |
1196 | ||
1da177e4 LT |
1197 | static void ipv4_link_failure(struct sk_buff *skb) |
1198 | { | |
1199 | struct rtable *rt; | |
1200 | ||
1201 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); | |
1202 | ||
511c3f92 | 1203 | rt = skb_rtable(skb); |
5943634f DM |
1204 | if (rt) |
1205 | dst_set_expires(&rt->dst, 0); | |
1da177e4 LT |
1206 | } |
1207 | ||
ede2059d | 1208 | static int ip_rt_bug(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1209 | { |
91df42be JP |
1210 | pr_debug("%s: %pI4 -> %pI4, %s\n", |
1211 | __func__, &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, | |
1212 | skb->dev ? skb->dev->name : "?"); | |
1da177e4 | 1213 | kfree_skb(skb); |
c378a9c0 | 1214 | WARN_ON(1); |
1da177e4 LT |
1215 | return 0; |
1216 | } | |
1217 | ||
1218 | /* | |
1219 | We do not cache source address of outgoing interface, | |
1220 | because it is used only by IP RR, TS and SRR options, | |
1221 | so that it out of fast path. | |
1222 | ||
1223 | BTW remember: "addr" is allowed to be not aligned | |
1224 | in IP options! | |
1225 | */ | |
1226 | ||
8e36360a | 1227 | void ip_rt_get_source(u8 *addr, struct sk_buff *skb, struct rtable *rt) |
1da177e4 | 1228 | { |
a61ced5d | 1229 | __be32 src; |
1da177e4 | 1230 | |
c7537967 | 1231 | if (rt_is_output_route(rt)) |
c5be24ff | 1232 | src = ip_hdr(skb)->saddr; |
ebc0ffae | 1233 | else { |
8e36360a DM |
1234 | struct fib_result res; |
1235 | struct flowi4 fl4; | |
1236 | struct iphdr *iph; | |
1237 | ||
1238 | iph = ip_hdr(skb); | |
1239 | ||
1240 | memset(&fl4, 0, sizeof(fl4)); | |
1241 | fl4.daddr = iph->daddr; | |
1242 | fl4.saddr = iph->saddr; | |
b0fe4a31 | 1243 | fl4.flowi4_tos = RT_TOS(iph->tos); |
8e36360a DM |
1244 | fl4.flowi4_oif = rt->dst.dev->ifindex; |
1245 | fl4.flowi4_iif = skb->dev->ifindex; | |
1246 | fl4.flowi4_mark = skb->mark; | |
5e2b61f7 | 1247 | |
ebc0ffae | 1248 | rcu_read_lock(); |
0eeb075f | 1249 | if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res, 0) == 0) |
436c3b66 | 1250 | src = FIB_RES_PREFSRC(dev_net(rt->dst.dev), res); |
ebc0ffae | 1251 | else |
f8126f1d DM |
1252 | src = inet_select_addr(rt->dst.dev, |
1253 | rt_nexthop(rt, iph->daddr), | |
1254 | RT_SCOPE_UNIVERSE); | |
ebc0ffae ED |
1255 | rcu_read_unlock(); |
1256 | } | |
1da177e4 LT |
1257 | memcpy(addr, &src, 4); |
1258 | } | |
1259 | ||
c7066f70 | 1260 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
1261 | static void set_class_tag(struct rtable *rt, u32 tag) |
1262 | { | |
d8d1f30b CG |
1263 | if (!(rt->dst.tclassid & 0xFFFF)) |
1264 | rt->dst.tclassid |= tag & 0xFFFF; | |
1265 | if (!(rt->dst.tclassid & 0xFFFF0000)) | |
1266 | rt->dst.tclassid |= tag & 0xFFFF0000; | |
1da177e4 LT |
1267 | } |
1268 | #endif | |
1269 | ||
0dbaee3b DM |
1270 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst) |
1271 | { | |
7ed14d97 | 1272 | unsigned int header_size = sizeof(struct tcphdr) + sizeof(struct iphdr); |
fdfcb06c | 1273 | unsigned int advmss = max_t(unsigned int, ipv4_mtu(dst) - header_size, |
7ed14d97 | 1274 | ip_rt_min_advmss); |
0dbaee3b | 1275 | |
7ed14d97 | 1276 | return min(advmss, IPV4_MAX_PMTU - header_size); |
0dbaee3b DM |
1277 | } |
1278 | ||
ebb762f2 | 1279 | static unsigned int ipv4_mtu(const struct dst_entry *dst) |
d33e4553 | 1280 | { |
261663b0 | 1281 | const struct rtable *rt = (const struct rtable *) dst; |
5943634f DM |
1282 | unsigned int mtu = rt->rt_pmtu; |
1283 | ||
98d75c37 | 1284 | if (!mtu || time_after_eq(jiffies, rt->dst.expires)) |
5943634f | 1285 | mtu = dst_metric_raw(dst, RTAX_MTU); |
618f9bc7 | 1286 | |
38d523e2 | 1287 | if (mtu) |
618f9bc7 SK |
1288 | return mtu; |
1289 | ||
c780a049 | 1290 | mtu = READ_ONCE(dst->dev->mtu); |
d33e4553 | 1291 | |
8387fbac | 1292 | if (unlikely(ip_mtu_locked(dst))) { |
155e8336 | 1293 | if (rt->rt_uses_gateway && mtu > 576) |
d33e4553 DM |
1294 | mtu = 576; |
1295 | } | |
1296 | ||
14972cbd RP |
1297 | mtu = min_t(unsigned int, mtu, IP_MAX_MTU); |
1298 | ||
1299 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); | |
d33e4553 DM |
1300 | } |
1301 | ||
c751af52 JA |
1302 | static void ip_del_fnhe(struct fib_nh *nh, __be32 daddr) |
1303 | { | |
1304 | struct fnhe_hash_bucket *hash; | |
1305 | struct fib_nh_exception *fnhe, __rcu **fnhe_p; | |
1306 | u32 hval = fnhe_hashfun(daddr); | |
1307 | ||
1308 | spin_lock_bh(&fnhe_lock); | |
1309 | ||
1310 | hash = rcu_dereference_protected(nh->nh_exceptions, | |
1311 | lockdep_is_held(&fnhe_lock)); | |
1312 | hash += hval; | |
1313 | ||
1314 | fnhe_p = &hash->chain; | |
1315 | fnhe = rcu_dereference_protected(*fnhe_p, lockdep_is_held(&fnhe_lock)); | |
1316 | while (fnhe) { | |
1317 | if (fnhe->fnhe_daddr == daddr) { | |
1318 | rcu_assign_pointer(*fnhe_p, rcu_dereference_protected( | |
1319 | fnhe->fnhe_next, lockdep_is_held(&fnhe_lock))); | |
68588407 XL |
1320 | /* set fnhe_daddr to 0 to ensure it won't bind with |
1321 | * new dsts in rt_bind_exception(). | |
1322 | */ | |
1323 | fnhe->fnhe_daddr = 0; | |
c751af52 JA |
1324 | fnhe_flush_routes(fnhe); |
1325 | kfree_rcu(fnhe, rcu); | |
1326 | break; | |
1327 | } | |
1328 | fnhe_p = &fnhe->fnhe_next; | |
1329 | fnhe = rcu_dereference_protected(fnhe->fnhe_next, | |
1330 | lockdep_is_held(&fnhe_lock)); | |
1331 | } | |
1332 | ||
1333 | spin_unlock_bh(&fnhe_lock); | |
1334 | } | |
1335 | ||
f2bb4bed | 1336 | static struct fib_nh_exception *find_exception(struct fib_nh *nh, __be32 daddr) |
4895c771 | 1337 | { |
caa41527 | 1338 | struct fnhe_hash_bucket *hash = rcu_dereference(nh->nh_exceptions); |
4895c771 DM |
1339 | struct fib_nh_exception *fnhe; |
1340 | u32 hval; | |
1341 | ||
f2bb4bed DM |
1342 | if (!hash) |
1343 | return NULL; | |
1344 | ||
d3a25c98 | 1345 | hval = fnhe_hashfun(daddr); |
4895c771 DM |
1346 | |
1347 | for (fnhe = rcu_dereference(hash[hval].chain); fnhe; | |
1348 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
c751af52 JA |
1349 | if (fnhe->fnhe_daddr == daddr) { |
1350 | if (fnhe->fnhe_expires && | |
1351 | time_after(jiffies, fnhe->fnhe_expires)) { | |
1352 | ip_del_fnhe(nh, daddr); | |
1353 | break; | |
1354 | } | |
f2bb4bed | 1355 | return fnhe; |
c751af52 | 1356 | } |
f2bb4bed DM |
1357 | } |
1358 | return NULL; | |
1359 | } | |
aee06da6 | 1360 | |
caacf05e | 1361 | static bool rt_bind_exception(struct rtable *rt, struct fib_nh_exception *fnhe, |
a4c2fd7f | 1362 | __be32 daddr, const bool do_cache) |
f2bb4bed | 1363 | { |
caacf05e DM |
1364 | bool ret = false; |
1365 | ||
c5038a83 | 1366 | spin_lock_bh(&fnhe_lock); |
f2bb4bed | 1367 | |
c5038a83 | 1368 | if (daddr == fnhe->fnhe_daddr) { |
2ffae99d TT |
1369 | struct rtable __rcu **porig; |
1370 | struct rtable *orig; | |
5aad1de5 | 1371 | int genid = fnhe_genid(dev_net(rt->dst.dev)); |
2ffae99d TT |
1372 | |
1373 | if (rt_is_input_route(rt)) | |
1374 | porig = &fnhe->fnhe_rth_input; | |
1375 | else | |
1376 | porig = &fnhe->fnhe_rth_output; | |
1377 | orig = rcu_dereference(*porig); | |
5aad1de5 TT |
1378 | |
1379 | if (fnhe->fnhe_genid != genid) { | |
1380 | fnhe->fnhe_genid = genid; | |
13d82bf5 SK |
1381 | fnhe->fnhe_gw = 0; |
1382 | fnhe->fnhe_pmtu = 0; | |
1383 | fnhe->fnhe_expires = 0; | |
2ffae99d TT |
1384 | fnhe_flush_routes(fnhe); |
1385 | orig = NULL; | |
13d82bf5 | 1386 | } |
387aa65a TT |
1387 | fill_route_from_fnhe(rt, fnhe); |
1388 | if (!rt->rt_gateway) | |
155e8336 | 1389 | rt->rt_gateway = daddr; |
f2bb4bed | 1390 | |
a4c2fd7f | 1391 | if (do_cache) { |
0830106c | 1392 | dst_hold(&rt->dst); |
2ffae99d | 1393 | rcu_assign_pointer(*porig, rt); |
0830106c | 1394 | if (orig) { |
95c47f9c | 1395 | dst_dev_put(&orig->dst); |
0830106c | 1396 | dst_release(&orig->dst); |
0830106c | 1397 | } |
2ffae99d TT |
1398 | ret = true; |
1399 | } | |
c5038a83 DM |
1400 | |
1401 | fnhe->fnhe_stamp = jiffies; | |
c5038a83 DM |
1402 | } |
1403 | spin_unlock_bh(&fnhe_lock); | |
caacf05e DM |
1404 | |
1405 | return ret; | |
54764bb6 ED |
1406 | } |
1407 | ||
caacf05e | 1408 | static bool rt_cache_route(struct fib_nh *nh, struct rtable *rt) |
f2bb4bed | 1409 | { |
d26b3a7c | 1410 | struct rtable *orig, *prev, **p; |
caacf05e | 1411 | bool ret = true; |
f2bb4bed | 1412 | |
d26b3a7c | 1413 | if (rt_is_input_route(rt)) { |
54764bb6 | 1414 | p = (struct rtable **)&nh->nh_rth_input; |
d26b3a7c | 1415 | } else { |
903ceff7 | 1416 | p = (struct rtable **)raw_cpu_ptr(nh->nh_pcpu_rth_output); |
d26b3a7c | 1417 | } |
f2bb4bed DM |
1418 | orig = *p; |
1419 | ||
0830106c WW |
1420 | /* hold dst before doing cmpxchg() to avoid race condition |
1421 | * on this dst | |
1422 | */ | |
1423 | dst_hold(&rt->dst); | |
f2bb4bed DM |
1424 | prev = cmpxchg(p, orig, rt); |
1425 | if (prev == orig) { | |
0830106c | 1426 | if (orig) { |
95c47f9c | 1427 | dst_dev_put(&orig->dst); |
0830106c | 1428 | dst_release(&orig->dst); |
0830106c WW |
1429 | } |
1430 | } else { | |
1431 | dst_release(&rt->dst); | |
caacf05e | 1432 | ret = false; |
0830106c | 1433 | } |
caacf05e DM |
1434 | |
1435 | return ret; | |
1436 | } | |
1437 | ||
5055c371 ED |
1438 | struct uncached_list { |
1439 | spinlock_t lock; | |
1440 | struct list_head head; | |
1441 | }; | |
1442 | ||
1443 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt_uncached_list); | |
caacf05e DM |
1444 | |
1445 | static void rt_add_uncached_list(struct rtable *rt) | |
1446 | { | |
5055c371 ED |
1447 | struct uncached_list *ul = raw_cpu_ptr(&rt_uncached_list); |
1448 | ||
1449 | rt->rt_uncached_list = ul; | |
1450 | ||
1451 | spin_lock_bh(&ul->lock); | |
1452 | list_add_tail(&rt->rt_uncached, &ul->head); | |
1453 | spin_unlock_bh(&ul->lock); | |
caacf05e DM |
1454 | } |
1455 | ||
1456 | static void ipv4_dst_destroy(struct dst_entry *dst) | |
1457 | { | |
3fb07daf | 1458 | struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst); |
caacf05e DM |
1459 | struct rtable *rt = (struct rtable *) dst; |
1460 | ||
9620fef2 | 1461 | if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt)) |
3fb07daf ED |
1462 | kfree(p); |
1463 | ||
78df76a0 | 1464 | if (!list_empty(&rt->rt_uncached)) { |
5055c371 ED |
1465 | struct uncached_list *ul = rt->rt_uncached_list; |
1466 | ||
1467 | spin_lock_bh(&ul->lock); | |
caacf05e | 1468 | list_del(&rt->rt_uncached); |
5055c371 | 1469 | spin_unlock_bh(&ul->lock); |
caacf05e DM |
1470 | } |
1471 | } | |
1472 | ||
1473 | void rt_flush_dev(struct net_device *dev) | |
1474 | { | |
5055c371 ED |
1475 | struct net *net = dev_net(dev); |
1476 | struct rtable *rt; | |
1477 | int cpu; | |
1478 | ||
1479 | for_each_possible_cpu(cpu) { | |
1480 | struct uncached_list *ul = &per_cpu(rt_uncached_list, cpu); | |
caacf05e | 1481 | |
5055c371 ED |
1482 | spin_lock_bh(&ul->lock); |
1483 | list_for_each_entry(rt, &ul->head, rt_uncached) { | |
caacf05e DM |
1484 | if (rt->dst.dev != dev) |
1485 | continue; | |
1486 | rt->dst.dev = net->loopback_dev; | |
1487 | dev_hold(rt->dst.dev); | |
1488 | dev_put(dev); | |
1489 | } | |
5055c371 | 1490 | spin_unlock_bh(&ul->lock); |
4895c771 DM |
1491 | } |
1492 | } | |
1493 | ||
4331debc | 1494 | static bool rt_cache_valid(const struct rtable *rt) |
d2d68ba9 | 1495 | { |
4331debc ED |
1496 | return rt && |
1497 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
1498 | !rt_is_expired(rt); | |
d2d68ba9 DM |
1499 | } |
1500 | ||
f2bb4bed | 1501 | static void rt_set_nexthop(struct rtable *rt, __be32 daddr, |
5e2b61f7 | 1502 | const struct fib_result *res, |
f2bb4bed | 1503 | struct fib_nh_exception *fnhe, |
a4c2fd7f WW |
1504 | struct fib_info *fi, u16 type, u32 itag, |
1505 | const bool do_cache) | |
1da177e4 | 1506 | { |
caacf05e DM |
1507 | bool cached = false; |
1508 | ||
1da177e4 | 1509 | if (fi) { |
4895c771 DM |
1510 | struct fib_nh *nh = &FIB_RES_NH(*res); |
1511 | ||
155e8336 | 1512 | if (nh->nh_gw && nh->nh_scope == RT_SCOPE_LINK) { |
4895c771 | 1513 | rt->rt_gateway = nh->nh_gw; |
155e8336 JA |
1514 | rt->rt_uses_gateway = 1; |
1515 | } | |
3fb07daf ED |
1516 | dst_init_metrics(&rt->dst, fi->fib_metrics->metrics, true); |
1517 | if (fi->fib_metrics != &dst_default_metrics) { | |
1518 | rt->dst._metrics |= DST_METRICS_REFCOUNTED; | |
9620fef2 | 1519 | refcount_inc(&fi->fib_metrics->refcnt); |
3fb07daf | 1520 | } |
c7066f70 | 1521 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f2bb4bed | 1522 | rt->dst.tclassid = nh->nh_tclassid; |
1da177e4 | 1523 | #endif |
61adedf3 | 1524 | rt->dst.lwtstate = lwtstate_get(nh->nh_lwtstate); |
c5038a83 | 1525 | if (unlikely(fnhe)) |
a4c2fd7f WW |
1526 | cached = rt_bind_exception(rt, fnhe, daddr, do_cache); |
1527 | else if (do_cache) | |
caacf05e | 1528 | cached = rt_cache_route(nh, rt); |
155e8336 JA |
1529 | if (unlikely(!cached)) { |
1530 | /* Routes we intend to cache in nexthop exception or | |
1531 | * FIB nexthop have the DST_NOCACHE bit clear. | |
1532 | * However, if we are unsuccessful at storing this | |
1533 | * route into the cache we really need to set it. | |
1534 | */ | |
155e8336 JA |
1535 | if (!rt->rt_gateway) |
1536 | rt->rt_gateway = daddr; | |
1537 | rt_add_uncached_list(rt); | |
1538 | } | |
1539 | } else | |
caacf05e | 1540 | rt_add_uncached_list(rt); |
defb3519 | 1541 | |
c7066f70 | 1542 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 | 1543 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
85b91b03 | 1544 | set_class_tag(rt, res->tclassid); |
1da177e4 LT |
1545 | #endif |
1546 | set_class_tag(rt, itag); | |
1547 | #endif | |
1da177e4 LT |
1548 | } |
1549 | ||
9ab179d8 DA |
1550 | struct rtable *rt_dst_alloc(struct net_device *dev, |
1551 | unsigned int flags, u16 type, | |
1552 | bool nopolicy, bool noxfrm, bool will_cache) | |
0c4dcd58 | 1553 | { |
d08c4f35 DA |
1554 | struct rtable *rt; |
1555 | ||
1556 | rt = dst_alloc(&ipv4_dst_ops, dev, 1, DST_OBSOLETE_FORCE_CHK, | |
a4c2fd7f | 1557 | (will_cache ? 0 : DST_HOST) | |
d08c4f35 | 1558 | (nopolicy ? DST_NOPOLICY : 0) | |
b2a9c0ed | 1559 | (noxfrm ? DST_NOXFRM : 0)); |
d08c4f35 DA |
1560 | |
1561 | if (rt) { | |
1562 | rt->rt_genid = rt_genid_ipv4(dev_net(dev)); | |
1563 | rt->rt_flags = flags; | |
1564 | rt->rt_type = type; | |
1565 | rt->rt_is_input = 0; | |
1566 | rt->rt_iif = 0; | |
1567 | rt->rt_pmtu = 0; | |
8387fbac | 1568 | rt->rt_mtu_locked = 0; |
d08c4f35 DA |
1569 | rt->rt_gateway = 0; |
1570 | rt->rt_uses_gateway = 0; | |
b7503e0c | 1571 | rt->rt_table_id = 0; |
d08c4f35 DA |
1572 | INIT_LIST_HEAD(&rt->rt_uncached); |
1573 | ||
1574 | rt->dst.output = ip_output; | |
1575 | if (flags & RTCF_LOCAL) | |
1576 | rt->dst.input = ip_local_deliver; | |
1577 | } | |
1578 | ||
1579 | return rt; | |
0c4dcd58 | 1580 | } |
9ab179d8 | 1581 | EXPORT_SYMBOL(rt_dst_alloc); |
0c4dcd58 | 1582 | |
96d36220 | 1583 | /* called in rcu_read_lock() section */ |
bc044e8d PA |
1584 | int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1585 | u8 tos, struct net_device *dev, | |
1586 | struct in_device *in_dev, u32 *itag) | |
1da177e4 | 1587 | { |
b5f7e755 | 1588 | int err; |
1da177e4 LT |
1589 | |
1590 | /* Primary sanity checks. */ | |
51456b29 | 1591 | if (!in_dev) |
1da177e4 LT |
1592 | return -EINVAL; |
1593 | ||
1e637c74 | 1594 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
d0daebc3 | 1595 | skb->protocol != htons(ETH_P_IP)) |
bc044e8d | 1596 | return -EINVAL; |
1da177e4 | 1597 | |
75fea73d | 1598 | if (ipv4_is_loopback(saddr) && !IN_DEV_ROUTE_LOCALNET(in_dev)) |
bc044e8d | 1599 | return -EINVAL; |
d0daebc3 | 1600 | |
f97c1e0c JP |
1601 | if (ipv4_is_zeronet(saddr)) { |
1602 | if (!ipv4_is_local_multicast(daddr)) | |
bc044e8d | 1603 | return -EINVAL; |
b5f7e755 | 1604 | } else { |
9e56e380 | 1605 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
bc044e8d | 1606 | in_dev, itag); |
b5f7e755 | 1607 | if (err < 0) |
bc044e8d | 1608 | return err; |
b5f7e755 | 1609 | } |
bc044e8d PA |
1610 | return 0; |
1611 | } | |
1612 | ||
1613 | /* called in rcu_read_lock() section */ | |
1614 | static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, | |
1615 | u8 tos, struct net_device *dev, int our) | |
1616 | { | |
1617 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
1618 | unsigned int flags = RTCF_MULTICAST; | |
1619 | struct rtable *rth; | |
1620 | u32 itag = 0; | |
1621 | int err; | |
1622 | ||
1623 | err = ip_mc_validate_source(skb, daddr, saddr, tos, dev, in_dev, &itag); | |
1624 | if (err) | |
1625 | return err; | |
1626 | ||
d08c4f35 DA |
1627 | if (our) |
1628 | flags |= RTCF_LOCAL; | |
1629 | ||
1630 | rth = rt_dst_alloc(dev_net(dev)->loopback_dev, flags, RTN_MULTICAST, | |
f2bb4bed | 1631 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false, false); |
1da177e4 | 1632 | if (!rth) |
bc044e8d | 1633 | return -ENOBUFS; |
1da177e4 | 1634 | |
cf911662 DM |
1635 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1636 | rth->dst.tclassid = itag; | |
1637 | #endif | |
d8d1f30b | 1638 | rth->dst.output = ip_rt_bug; |
9917e1e8 | 1639 | rth->rt_is_input= 1; |
1da177e4 LT |
1640 | |
1641 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c | 1642 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
d8d1f30b | 1643 | rth->dst.input = ip_mr_input; |
1da177e4 LT |
1644 | #endif |
1645 | RT_CACHE_STAT_INC(in_slow_mc); | |
1646 | ||
89aef892 DM |
1647 | skb_dst_set(skb, &rth->dst); |
1648 | return 0; | |
1da177e4 LT |
1649 | } |
1650 | ||
1651 | ||
1652 | static void ip_handle_martian_source(struct net_device *dev, | |
1653 | struct in_device *in_dev, | |
1654 | struct sk_buff *skb, | |
9e12bb22 AV |
1655 | __be32 daddr, |
1656 | __be32 saddr) | |
1da177e4 LT |
1657 | { |
1658 | RT_CACHE_STAT_INC(in_martian_src); | |
1659 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1660 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { | |
1661 | /* | |
1662 | * RFC1812 recommendation, if source is martian, | |
1663 | * the only hint is MAC header. | |
1664 | */ | |
058bd4d2 | 1665 | pr_warn("martian source %pI4 from %pI4, on dev %s\n", |
673d57e7 | 1666 | &daddr, &saddr, dev->name); |
98e399f8 | 1667 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
058bd4d2 JP |
1668 | print_hex_dump(KERN_WARNING, "ll header: ", |
1669 | DUMP_PREFIX_OFFSET, 16, 1, | |
1670 | skb_mac_header(skb), | |
1671 | dev->hard_header_len, true); | |
1da177e4 LT |
1672 | } |
1673 | } | |
1674 | #endif | |
1675 | } | |
1676 | ||
efd85700 TG |
1677 | static void set_lwt_redirect(struct rtable *rth) |
1678 | { | |
1679 | if (lwtunnel_output_redirect(rth->dst.lwtstate)) { | |
1680 | rth->dst.lwtstate->orig_output = rth->dst.output; | |
1681 | rth->dst.output = lwtunnel_output; | |
1682 | } | |
1683 | ||
1684 | if (lwtunnel_input_redirect(rth->dst.lwtstate)) { | |
1685 | rth->dst.lwtstate->orig_input = rth->dst.input; | |
1686 | rth->dst.input = lwtunnel_input; | |
1687 | } | |
1688 | } | |
1689 | ||
47360228 | 1690 | /* called in rcu_read_lock() section */ |
5969f71d | 1691 | static int __mkroute_input(struct sk_buff *skb, |
982721f3 | 1692 | const struct fib_result *res, |
5969f71d | 1693 | struct in_device *in_dev, |
c6cffba4 | 1694 | __be32 daddr, __be32 saddr, u32 tos) |
1da177e4 | 1695 | { |
2ffae99d | 1696 | struct fib_nh_exception *fnhe; |
1da177e4 LT |
1697 | struct rtable *rth; |
1698 | int err; | |
1699 | struct in_device *out_dev; | |
d2d68ba9 | 1700 | bool do_cache; |
fbdc0ad0 | 1701 | u32 itag = 0; |
1da177e4 LT |
1702 | |
1703 | /* get a working reference to the output device */ | |
47360228 | 1704 | out_dev = __in_dev_get_rcu(FIB_RES_DEV(*res)); |
51456b29 | 1705 | if (!out_dev) { |
e87cc472 | 1706 | net_crit_ratelimited("Bug in ip_route_input_slow(). Please report.\n"); |
1da177e4 LT |
1707 | return -EINVAL; |
1708 | } | |
1709 | ||
5c04c819 | 1710 | err = fib_validate_source(skb, saddr, daddr, tos, FIB_RES_OIF(*res), |
9e56e380 | 1711 | in_dev->dev, in_dev, &itag); |
1da177e4 | 1712 | if (err < 0) { |
e905a9ed | 1713 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
1da177e4 | 1714 | saddr); |
e905a9ed | 1715 | |
1da177e4 LT |
1716 | goto cleanup; |
1717 | } | |
1718 | ||
e81da0e1 JA |
1719 | do_cache = res->fi && !itag; |
1720 | if (out_dev == in_dev && err && IN_DEV_TX_REDIRECTS(out_dev) && | |
df4d9254 | 1721 | skb->protocol == htons(ETH_P_IP) && |
1da177e4 | 1722 | (IN_DEV_SHARED_MEDIA(out_dev) || |
df4d9254 HFS |
1723 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) |
1724 | IPCB(skb)->flags |= IPSKB_DOREDIRECT; | |
1da177e4 LT |
1725 | |
1726 | if (skb->protocol != htons(ETH_P_IP)) { | |
1727 | /* Not IP (i.e. ARP). Do not create route, if it is | |
1728 | * invalid for proxy arp. DNAT routes are always valid. | |
65324144 JDB |
1729 | * |
1730 | * Proxy arp feature have been extended to allow, ARP | |
1731 | * replies back to the same interface, to support | |
1732 | * Private VLAN switch technologies. See arp.c. | |
1da177e4 | 1733 | */ |
65324144 JDB |
1734 | if (out_dev == in_dev && |
1735 | IN_DEV_PROXY_ARP_PVLAN(in_dev) == 0) { | |
1da177e4 LT |
1736 | err = -EINVAL; |
1737 | goto cleanup; | |
1738 | } | |
1739 | } | |
1740 | ||
2ffae99d | 1741 | fnhe = find_exception(&FIB_RES_NH(*res), daddr); |
e81da0e1 | 1742 | if (do_cache) { |
c751af52 | 1743 | if (fnhe) |
2ffae99d | 1744 | rth = rcu_dereference(fnhe->fnhe_rth_input); |
c751af52 JA |
1745 | else |
1746 | rth = rcu_dereference(FIB_RES_NH(*res).nh_rth_input); | |
e81da0e1 JA |
1747 | if (rt_cache_valid(rth)) { |
1748 | skb_dst_set_noref(skb, &rth->dst); | |
1749 | goto out; | |
d2d68ba9 DM |
1750 | } |
1751 | } | |
f2bb4bed | 1752 | |
d08c4f35 | 1753 | rth = rt_dst_alloc(out_dev->dev, 0, res->type, |
5c1e6aa3 | 1754 | IN_DEV_CONF_GET(in_dev, NOPOLICY), |
d2d68ba9 | 1755 | IN_DEV_CONF_GET(out_dev, NOXFRM), do_cache); |
1da177e4 LT |
1756 | if (!rth) { |
1757 | err = -ENOBUFS; | |
1758 | goto cleanup; | |
1759 | } | |
1760 | ||
9917e1e8 | 1761 | rth->rt_is_input = 1; |
b7503e0c DA |
1762 | if (res->table) |
1763 | rth->rt_table_id = res->table->tb_id; | |
a6254864 | 1764 | RT_CACHE_STAT_INC(in_slow_tot); |
1da177e4 | 1765 | |
d8d1f30b | 1766 | rth->dst.input = ip_forward; |
1da177e4 | 1767 | |
a4c2fd7f WW |
1768 | rt_set_nexthop(rth, daddr, res, fnhe, res->fi, res->type, itag, |
1769 | do_cache); | |
efd85700 | 1770 | set_lwt_redirect(rth); |
c6cffba4 | 1771 | skb_dst_set(skb, &rth->dst); |
d2d68ba9 | 1772 | out: |
1da177e4 LT |
1773 | err = 0; |
1774 | cleanup: | |
1da177e4 | 1775 | return err; |
e905a9ed | 1776 | } |
1da177e4 | 1777 | |
79a13159 | 1778 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
79a13159 | 1779 | /* To make ICMP packets follow the right flow, the multipath hash is |
bf4e0a3d | 1780 | * calculated from the inner IP addresses. |
79a13159 | 1781 | */ |
bf4e0a3d NA |
1782 | static void ip_multipath_l3_keys(const struct sk_buff *skb, |
1783 | struct flow_keys *hash_keys) | |
79a13159 PN |
1784 | { |
1785 | const struct iphdr *outer_iph = ip_hdr(skb); | |
bf4e0a3d | 1786 | const struct iphdr *inner_iph; |
79a13159 PN |
1787 | const struct icmphdr *icmph; |
1788 | struct iphdr _inner_iph; | |
bf4e0a3d NA |
1789 | struct icmphdr _icmph; |
1790 | ||
1791 | hash_keys->addrs.v4addrs.src = outer_iph->saddr; | |
1792 | hash_keys->addrs.v4addrs.dst = outer_iph->daddr; | |
1793 | if (likely(outer_iph->protocol != IPPROTO_ICMP)) | |
1794 | return; | |
79a13159 PN |
1795 | |
1796 | if (unlikely((outer_iph->frag_off & htons(IP_OFFSET)) != 0)) | |
bf4e0a3d | 1797 | return; |
79a13159 PN |
1798 | |
1799 | icmph = skb_header_pointer(skb, outer_iph->ihl * 4, sizeof(_icmph), | |
1800 | &_icmph); | |
1801 | if (!icmph) | |
bf4e0a3d | 1802 | return; |
79a13159 PN |
1803 | |
1804 | if (icmph->type != ICMP_DEST_UNREACH && | |
1805 | icmph->type != ICMP_REDIRECT && | |
1806 | icmph->type != ICMP_TIME_EXCEEDED && | |
bf4e0a3d NA |
1807 | icmph->type != ICMP_PARAMETERPROB) |
1808 | return; | |
79a13159 PN |
1809 | |
1810 | inner_iph = skb_header_pointer(skb, | |
1811 | outer_iph->ihl * 4 + sizeof(_icmph), | |
1812 | sizeof(_inner_iph), &_inner_iph); | |
1813 | if (!inner_iph) | |
bf4e0a3d NA |
1814 | return; |
1815 | hash_keys->addrs.v4addrs.src = inner_iph->saddr; | |
1816 | hash_keys->addrs.v4addrs.dst = inner_iph->daddr; | |
1817 | } | |
79a13159 | 1818 | |
bf4e0a3d NA |
1819 | /* if skb is set it will be used and fl4 can be NULL */ |
1820 | int fib_multipath_hash(const struct fib_info *fi, const struct flowi4 *fl4, | |
1821 | const struct sk_buff *skb) | |
1822 | { | |
1823 | struct net *net = fi->fib_net; | |
1824 | struct flow_keys hash_keys; | |
1825 | u32 mhash; | |
79a13159 | 1826 | |
bf4e0a3d NA |
1827 | switch (net->ipv4.sysctl_fib_multipath_hash_policy) { |
1828 | case 0: | |
1829 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
1830 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
1831 | if (skb) { | |
1832 | ip_multipath_l3_keys(skb, &hash_keys); | |
1833 | } else { | |
1834 | hash_keys.addrs.v4addrs.src = fl4->saddr; | |
1835 | hash_keys.addrs.v4addrs.dst = fl4->daddr; | |
1836 | } | |
1837 | break; | |
1838 | case 1: | |
1839 | /* skb is currently provided only when forwarding */ | |
1840 | if (skb) { | |
1841 | unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; | |
1842 | struct flow_keys keys; | |
1843 | ||
1844 | /* short-circuit if we already have L4 hash present */ | |
1845 | if (skb->l4_hash) | |
1846 | return skb_get_hash_raw(skb) >> 1; | |
1847 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
1848 | skb_flow_dissect_flow_keys(skb, &keys, flag); | |
97ba6e5f DA |
1849 | |
1850 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
bf4e0a3d NA |
1851 | hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src; |
1852 | hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst; | |
1853 | hash_keys.ports.src = keys.ports.src; | |
1854 | hash_keys.ports.dst = keys.ports.dst; | |
1855 | hash_keys.basic.ip_proto = keys.basic.ip_proto; | |
1856 | } else { | |
1857 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
1858 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
1859 | hash_keys.addrs.v4addrs.src = fl4->saddr; | |
1860 | hash_keys.addrs.v4addrs.dst = fl4->daddr; | |
1861 | hash_keys.ports.src = fl4->fl4_sport; | |
1862 | hash_keys.ports.dst = fl4->fl4_dport; | |
1863 | hash_keys.basic.ip_proto = fl4->flowi4_proto; | |
1864 | } | |
1865 | break; | |
1866 | } | |
1867 | mhash = flow_hash_from_keys(&hash_keys); | |
79a13159 | 1868 | |
bf4e0a3d NA |
1869 | return mhash >> 1; |
1870 | } | |
1871 | EXPORT_SYMBOL_GPL(fib_multipath_hash); | |
79a13159 PN |
1872 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ |
1873 | ||
5969f71d SH |
1874 | static int ip_mkroute_input(struct sk_buff *skb, |
1875 | struct fib_result *res, | |
5969f71d SH |
1876 | struct in_device *in_dev, |
1877 | __be32 daddr, __be32 saddr, u32 tos) | |
1da177e4 | 1878 | { |
1da177e4 | 1879 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
0e884c78 | 1880 | if (res->fi && res->fi->fib_nhs > 1) { |
bf4e0a3d | 1881 | int h = fib_multipath_hash(res->fi, NULL, skb); |
0e884c78 | 1882 | |
0e884c78 PN |
1883 | fib_select_multipath(res, h); |
1884 | } | |
1da177e4 LT |
1885 | #endif |
1886 | ||
1887 | /* create a routing cache entry */ | |
c6cffba4 | 1888 | return __mkroute_input(skb, res, in_dev, daddr, saddr, tos); |
1da177e4 LT |
1889 | } |
1890 | ||
1da177e4 LT |
1891 | /* |
1892 | * NOTE. We drop all the packets that has local source | |
1893 | * addresses, because every properly looped back packet | |
1894 | * must have correct destination already attached by output routine. | |
1895 | * | |
1896 | * Such approach solves two big problems: | |
1897 | * 1. Not simplex devices are handled properly. | |
1898 | * 2. IP spoofing attempts are filtered with 100% of guarantee. | |
ebc0ffae | 1899 | * called with rcu_read_lock() |
1da177e4 LT |
1900 | */ |
1901 | ||
9e12bb22 | 1902 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
5510cdf7 DA |
1903 | u8 tos, struct net_device *dev, |
1904 | struct fib_result *res) | |
1da177e4 | 1905 | { |
96d36220 | 1906 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
1b7179d3 | 1907 | struct ip_tunnel_info *tun_info; |
68a5e3dd | 1908 | struct flowi4 fl4; |
95c96174 | 1909 | unsigned int flags = 0; |
1da177e4 | 1910 | u32 itag = 0; |
95c96174 | 1911 | struct rtable *rth; |
1da177e4 | 1912 | int err = -EINVAL; |
5e73ea1a | 1913 | struct net *net = dev_net(dev); |
d2d68ba9 | 1914 | bool do_cache; |
1da177e4 LT |
1915 | |
1916 | /* IP on this device is disabled. */ | |
1917 | ||
1918 | if (!in_dev) | |
1919 | goto out; | |
1920 | ||
1921 | /* Check for the most weird martians, which can be not detected | |
1922 | by fib_lookup. | |
1923 | */ | |
1924 | ||
61adedf3 | 1925 | tun_info = skb_tunnel_info(skb); |
46fa062a | 1926 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
1b7179d3 TG |
1927 | fl4.flowi4_tun_key.tun_id = tun_info->key.tun_id; |
1928 | else | |
1929 | fl4.flowi4_tun_key.tun_id = 0; | |
f38a9eb1 TG |
1930 | skb_dst_drop(skb); |
1931 | ||
d0daebc3 | 1932 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) |
1da177e4 LT |
1933 | goto martian_source; |
1934 | ||
5510cdf7 DA |
1935 | res->fi = NULL; |
1936 | res->table = NULL; | |
27a954bd | 1937 | if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0)) |
1da177e4 LT |
1938 | goto brd_input; |
1939 | ||
1940 | /* Accept zero addresses only to limited broadcast; | |
1941 | * I even do not know to fix it or not. Waiting for complains :-) | |
1942 | */ | |
f97c1e0c | 1943 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
1944 | goto martian_source; |
1945 | ||
d0daebc3 | 1946 | if (ipv4_is_zeronet(daddr)) |
1da177e4 LT |
1947 | goto martian_destination; |
1948 | ||
9eb43e76 ED |
1949 | /* Following code try to avoid calling IN_DEV_NET_ROUTE_LOCALNET(), |
1950 | * and call it once if daddr or/and saddr are loopback addresses | |
1951 | */ | |
1952 | if (ipv4_is_loopback(daddr)) { | |
1953 | if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) | |
d0daebc3 | 1954 | goto martian_destination; |
9eb43e76 ED |
1955 | } else if (ipv4_is_loopback(saddr)) { |
1956 | if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) | |
d0daebc3 TG |
1957 | goto martian_source; |
1958 | } | |
1959 | ||
1da177e4 LT |
1960 | /* |
1961 | * Now we are ready to route packet. | |
1962 | */ | |
68a5e3dd | 1963 | fl4.flowi4_oif = 0; |
e0d56fdd | 1964 | fl4.flowi4_iif = dev->ifindex; |
68a5e3dd DM |
1965 | fl4.flowi4_mark = skb->mark; |
1966 | fl4.flowi4_tos = tos; | |
1967 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
b84f7878 | 1968 | fl4.flowi4_flags = 0; |
68a5e3dd DM |
1969 | fl4.daddr = daddr; |
1970 | fl4.saddr = saddr; | |
8bcfd092 | 1971 | fl4.flowi4_uid = sock_net_uid(net, NULL); |
5510cdf7 | 1972 | err = fib_lookup(net, &fl4, res, 0); |
cd0f0b95 DJ |
1973 | if (err != 0) { |
1974 | if (!IN_DEV_FORWARD(in_dev)) | |
1975 | err = -EHOSTUNREACH; | |
1da177e4 | 1976 | goto no_route; |
cd0f0b95 | 1977 | } |
1da177e4 | 1978 | |
5510cdf7 | 1979 | if (res->type == RTN_BROADCAST) |
1da177e4 LT |
1980 | goto brd_input; |
1981 | ||
5510cdf7 | 1982 | if (res->type == RTN_LOCAL) { |
5c04c819 | 1983 | err = fib_validate_source(skb, saddr, daddr, tos, |
0d5edc68 | 1984 | 0, dev, in_dev, &itag); |
b5f7e755 | 1985 | if (err < 0) |
0d753960 | 1986 | goto martian_source; |
1da177e4 LT |
1987 | goto local_input; |
1988 | } | |
1989 | ||
cd0f0b95 DJ |
1990 | if (!IN_DEV_FORWARD(in_dev)) { |
1991 | err = -EHOSTUNREACH; | |
251da413 | 1992 | goto no_route; |
cd0f0b95 | 1993 | } |
5510cdf7 | 1994 | if (res->type != RTN_UNICAST) |
1da177e4 LT |
1995 | goto martian_destination; |
1996 | ||
5510cdf7 | 1997 | err = ip_mkroute_input(skb, res, in_dev, daddr, saddr, tos); |
1da177e4 LT |
1998 | out: return err; |
1999 | ||
2000 | brd_input: | |
2001 | if (skb->protocol != htons(ETH_P_IP)) | |
2002 | goto e_inval; | |
2003 | ||
41347dcd | 2004 | if (!ipv4_is_zeronet(saddr)) { |
9e56e380 DM |
2005 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
2006 | in_dev, &itag); | |
1da177e4 | 2007 | if (err < 0) |
0d753960 | 2008 | goto martian_source; |
1da177e4 LT |
2009 | } |
2010 | flags |= RTCF_BROADCAST; | |
5510cdf7 | 2011 | res->type = RTN_BROADCAST; |
1da177e4 LT |
2012 | RT_CACHE_STAT_INC(in_brd); |
2013 | ||
2014 | local_input: | |
d2d68ba9 | 2015 | do_cache = false; |
5510cdf7 | 2016 | if (res->fi) { |
fe3edf45 | 2017 | if (!itag) { |
5510cdf7 | 2018 | rth = rcu_dereference(FIB_RES_NH(*res).nh_rth_input); |
d2d68ba9 | 2019 | if (rt_cache_valid(rth)) { |
c6cffba4 DM |
2020 | skb_dst_set_noref(skb, &rth->dst); |
2021 | err = 0; | |
2022 | goto out; | |
d2d68ba9 DM |
2023 | } |
2024 | do_cache = true; | |
2025 | } | |
2026 | } | |
2027 | ||
f5a0aab8 | 2028 | rth = rt_dst_alloc(l3mdev_master_dev_rcu(dev) ? : net->loopback_dev, |
5510cdf7 | 2029 | flags | RTCF_LOCAL, res->type, |
d2d68ba9 | 2030 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false, do_cache); |
1da177e4 LT |
2031 | if (!rth) |
2032 | goto e_nobufs; | |
2033 | ||
d8d1f30b | 2034 | rth->dst.output= ip_rt_bug; |
cf911662 DM |
2035 | #ifdef CONFIG_IP_ROUTE_CLASSID |
2036 | rth->dst.tclassid = itag; | |
2037 | #endif | |
9917e1e8 | 2038 | rth->rt_is_input = 1; |
5510cdf7 DA |
2039 | if (res->table) |
2040 | rth->rt_table_id = res->table->tb_id; | |
571e7226 | 2041 | |
a6254864 | 2042 | RT_CACHE_STAT_INC(in_slow_tot); |
5510cdf7 | 2043 | if (res->type == RTN_UNREACHABLE) { |
d8d1f30b CG |
2044 | rth->dst.input= ip_error; |
2045 | rth->dst.error= -err; | |
1da177e4 LT |
2046 | rth->rt_flags &= ~RTCF_LOCAL; |
2047 | } | |
efd85700 | 2048 | |
dcdfdf56 | 2049 | if (do_cache) { |
5510cdf7 | 2050 | struct fib_nh *nh = &FIB_RES_NH(*res); |
efd85700 TG |
2051 | |
2052 | rth->dst.lwtstate = lwtstate_get(nh->nh_lwtstate); | |
2053 | if (lwtunnel_input_redirect(rth->dst.lwtstate)) { | |
2054 | WARN_ON(rth->dst.input == lwtunnel_input); | |
2055 | rth->dst.lwtstate->orig_input = rth->dst.input; | |
2056 | rth->dst.input = lwtunnel_input; | |
2057 | } | |
2058 | ||
a4c2fd7f | 2059 | if (unlikely(!rt_cache_route(nh, rth))) |
dcdfdf56 | 2060 | rt_add_uncached_list(rth); |
dcdfdf56 | 2061 | } |
89aef892 | 2062 | skb_dst_set(skb, &rth->dst); |
b23dd4fe | 2063 | err = 0; |
ebc0ffae | 2064 | goto out; |
1da177e4 LT |
2065 | |
2066 | no_route: | |
2067 | RT_CACHE_STAT_INC(in_no_route); | |
5510cdf7 DA |
2068 | res->type = RTN_UNREACHABLE; |
2069 | res->fi = NULL; | |
2070 | res->table = NULL; | |
1da177e4 LT |
2071 | goto local_input; |
2072 | ||
2073 | /* | |
2074 | * Do not cache martian addresses: they should be logged (RFC1812) | |
2075 | */ | |
2076 | martian_destination: | |
2077 | RT_CACHE_STAT_INC(in_martian_dst); | |
2078 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
e87cc472 JP |
2079 | if (IN_DEV_LOG_MARTIANS(in_dev)) |
2080 | net_warn_ratelimited("martian destination %pI4 from %pI4, dev %s\n", | |
2081 | &daddr, &saddr, dev->name); | |
1da177e4 | 2082 | #endif |
2c2910a4 | 2083 | |
1da177e4 LT |
2084 | e_inval: |
2085 | err = -EINVAL; | |
ebc0ffae | 2086 | goto out; |
1da177e4 LT |
2087 | |
2088 | e_nobufs: | |
2089 | err = -ENOBUFS; | |
ebc0ffae | 2090 | goto out; |
1da177e4 LT |
2091 | |
2092 | martian_source: | |
2093 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); | |
ebc0ffae | 2094 | goto out; |
1da177e4 LT |
2095 | } |
2096 | ||
c6cffba4 DM |
2097 | int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
2098 | u8 tos, struct net_device *dev) | |
1da177e4 | 2099 | { |
5510cdf7 DA |
2100 | struct fib_result res; |
2101 | int err; | |
1da177e4 | 2102 | |
6e28099d | 2103 | tos &= IPTOS_RT_MASK; |
96d36220 | 2104 | rcu_read_lock(); |
5510cdf7 DA |
2105 | err = ip_route_input_rcu(skb, daddr, saddr, tos, dev, &res); |
2106 | rcu_read_unlock(); | |
96d36220 | 2107 | |
5510cdf7 DA |
2108 | return err; |
2109 | } | |
2110 | EXPORT_SYMBOL(ip_route_input_noref); | |
2111 | ||
2112 | /* called with rcu_read_lock held */ | |
2113 | int ip_route_input_rcu(struct sk_buff *skb, __be32 daddr, __be32 saddr, | |
2114 | u8 tos, struct net_device *dev, struct fib_result *res) | |
2115 | { | |
1da177e4 LT |
2116 | /* Multicast recognition logic is moved from route cache to here. |
2117 | The problem was that too many Ethernet cards have broken/missing | |
2118 | hardware multicast filters :-( As result the host on multicasting | |
2119 | network acquires a lot of useless route cache entries, sort of | |
2120 | SDR messages from all the world. Now we try to get rid of them. | |
2121 | Really, provided software IP multicast filter is organized | |
2122 | reasonably (at least, hashed), it does not result in a slowdown | |
2123 | comparing with route cache reject entries. | |
2124 | Note, that multicast routers are not affected, because | |
2125 | route cache entry is created eventually. | |
2126 | */ | |
f97c1e0c | 2127 | if (ipv4_is_multicast(daddr)) { |
96d36220 | 2128 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
e58e4159 | 2129 | int our = 0; |
5510cdf7 | 2130 | int err = -EINVAL; |
1da177e4 | 2131 | |
c8c6b846 PA |
2132 | if (!in_dev) |
2133 | return err; | |
2134 | our = ip_check_mc_rcu(in_dev, daddr, saddr, | |
2135 | ip_hdr(skb)->protocol); | |
e58e4159 DA |
2136 | |
2137 | /* check l3 master if no match yet */ | |
c8c6b846 | 2138 | if (!our && netif_is_l3_slave(dev)) { |
e58e4159 DA |
2139 | struct in_device *l3_in_dev; |
2140 | ||
2141 | l3_in_dev = __in_dev_get_rcu(skb->dev); | |
2142 | if (l3_in_dev) | |
2143 | our = ip_check_mc_rcu(l3_in_dev, daddr, saddr, | |
2144 | ip_hdr(skb)->protocol); | |
2145 | } | |
2146 | ||
e58e4159 | 2147 | if (our |
1da177e4 | 2148 | #ifdef CONFIG_IP_MROUTE |
e58e4159 DA |
2149 | || |
2150 | (!ipv4_is_local_multicast(daddr) && | |
2151 | IN_DEV_MFORWARD(in_dev)) | |
1da177e4 | 2152 | #endif |
e58e4159 | 2153 | ) { |
5510cdf7 | 2154 | err = ip_route_input_mc(skb, daddr, saddr, |
e58e4159 | 2155 | tos, dev, our); |
1da177e4 | 2156 | } |
5510cdf7 | 2157 | return err; |
1da177e4 | 2158 | } |
5510cdf7 DA |
2159 | |
2160 | return ip_route_input_slow(skb, daddr, saddr, tos, dev, res); | |
1da177e4 LT |
2161 | } |
2162 | ||
ebc0ffae | 2163 | /* called with rcu_read_lock() */ |
982721f3 | 2164 | static struct rtable *__mkroute_output(const struct fib_result *res, |
1a00fee4 | 2165 | const struct flowi4 *fl4, int orig_oif, |
f61759e6 | 2166 | struct net_device *dev_out, |
5ada5527 | 2167 | unsigned int flags) |
1da177e4 | 2168 | { |
982721f3 | 2169 | struct fib_info *fi = res->fi; |
f2bb4bed | 2170 | struct fib_nh_exception *fnhe; |
5ada5527 | 2171 | struct in_device *in_dev; |
982721f3 | 2172 | u16 type = res->type; |
5ada5527 | 2173 | struct rtable *rth; |
c92b9655 | 2174 | bool do_cache; |
1da177e4 | 2175 | |
d0daebc3 TG |
2176 | in_dev = __in_dev_get_rcu(dev_out); |
2177 | if (!in_dev) | |
5ada5527 | 2178 | return ERR_PTR(-EINVAL); |
1da177e4 | 2179 | |
d0daebc3 | 2180 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) |
5f02ce24 DA |
2181 | if (ipv4_is_loopback(fl4->saddr) && |
2182 | !(dev_out->flags & IFF_LOOPBACK) && | |
2183 | !netif_is_l3_master(dev_out)) | |
d0daebc3 TG |
2184 | return ERR_PTR(-EINVAL); |
2185 | ||
68a5e3dd | 2186 | if (ipv4_is_lbcast(fl4->daddr)) |
982721f3 | 2187 | type = RTN_BROADCAST; |
68a5e3dd | 2188 | else if (ipv4_is_multicast(fl4->daddr)) |
982721f3 | 2189 | type = RTN_MULTICAST; |
68a5e3dd | 2190 | else if (ipv4_is_zeronet(fl4->daddr)) |
5ada5527 | 2191 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
2192 | |
2193 | if (dev_out->flags & IFF_LOOPBACK) | |
2194 | flags |= RTCF_LOCAL; | |
2195 | ||
63617421 | 2196 | do_cache = true; |
982721f3 | 2197 | if (type == RTN_BROADCAST) { |
1da177e4 | 2198 | flags |= RTCF_BROADCAST | RTCF_LOCAL; |
982721f3 DM |
2199 | fi = NULL; |
2200 | } else if (type == RTN_MULTICAST) { | |
dd28d1a0 | 2201 | flags |= RTCF_MULTICAST | RTCF_LOCAL; |
813b3b5d DM |
2202 | if (!ip_check_mc_rcu(in_dev, fl4->daddr, fl4->saddr, |
2203 | fl4->flowi4_proto)) | |
1da177e4 | 2204 | flags &= ~RTCF_LOCAL; |
63617421 JA |
2205 | else |
2206 | do_cache = false; | |
1da177e4 | 2207 | /* If multicast route do not exist use |
dd28d1a0 ED |
2208 | * default one, but do not gateway in this case. |
2209 | * Yes, it is hack. | |
1da177e4 | 2210 | */ |
982721f3 DM |
2211 | if (fi && res->prefixlen < 4) |
2212 | fi = NULL; | |
d6d5e999 CF |
2213 | } else if ((type == RTN_LOCAL) && (orig_oif != 0) && |
2214 | (orig_oif != dev_out->ifindex)) { | |
2215 | /* For local routes that require a particular output interface | |
2216 | * we do not want to cache the result. Caching the result | |
2217 | * causes incorrect behaviour when there are multiple source | |
2218 | * addresses on the interface, the end result being that if the | |
2219 | * intended recipient is waiting on that interface for the | |
2220 | * packet he won't receive it because it will be delivered on | |
2221 | * the loopback interface and the IP_PKTINFO ipi_ifindex will | |
2222 | * be set to the loopback interface as well. | |
2223 | */ | |
c751af52 | 2224 | do_cache = false; |
1da177e4 LT |
2225 | } |
2226 | ||
f2bb4bed | 2227 | fnhe = NULL; |
63617421 | 2228 | do_cache &= fi != NULL; |
c751af52 | 2229 | if (fi) { |
c5038a83 | 2230 | struct rtable __rcu **prth; |
c92b9655 | 2231 | struct fib_nh *nh = &FIB_RES_NH(*res); |
d26b3a7c | 2232 | |
c92b9655 | 2233 | fnhe = find_exception(nh, fl4->daddr); |
c751af52 JA |
2234 | if (!do_cache) |
2235 | goto add; | |
deed49df | 2236 | if (fnhe) { |
2ffae99d | 2237 | prth = &fnhe->fnhe_rth_output; |
c751af52 JA |
2238 | } else { |
2239 | if (unlikely(fl4->flowi4_flags & | |
2240 | FLOWI_FLAG_KNOWN_NH && | |
2241 | !(nh->nh_gw && | |
2242 | nh->nh_scope == RT_SCOPE_LINK))) { | |
2243 | do_cache = false; | |
2244 | goto add; | |
c92b9655 | 2245 | } |
c751af52 | 2246 | prth = raw_cpu_ptr(nh->nh_pcpu_rth_output); |
c92b9655 | 2247 | } |
c5038a83 | 2248 | rth = rcu_dereference(*prth); |
9df16efa | 2249 | if (rt_cache_valid(rth) && dst_hold_safe(&rth->dst)) |
c5038a83 | 2250 | return rth; |
f2bb4bed | 2251 | } |
c92b9655 JA |
2252 | |
2253 | add: | |
d08c4f35 | 2254 | rth = rt_dst_alloc(dev_out, flags, type, |
5c1e6aa3 | 2255 | IN_DEV_CONF_GET(in_dev, NOPOLICY), |
f2bb4bed | 2256 | IN_DEV_CONF_GET(in_dev, NOXFRM), |
c92b9655 | 2257 | do_cache); |
8391d07b | 2258 | if (!rth) |
5ada5527 | 2259 | return ERR_PTR(-ENOBUFS); |
8391d07b | 2260 | |
9438c871 | 2261 | rth->rt_iif = orig_oif; |
b7503e0c DA |
2262 | if (res->table) |
2263 | rth->rt_table_id = res->table->tb_id; | |
2264 | ||
1da177e4 LT |
2265 | RT_CACHE_STAT_INC(out_slow_tot); |
2266 | ||
1da177e4 | 2267 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { |
e905a9ed | 2268 | if (flags & RTCF_LOCAL && |
1da177e4 | 2269 | !(dev_out->flags & IFF_LOOPBACK)) { |
d8d1f30b | 2270 | rth->dst.output = ip_mc_output; |
1da177e4 LT |
2271 | RT_CACHE_STAT_INC(out_slow_mc); |
2272 | } | |
2273 | #ifdef CONFIG_IP_MROUTE | |
982721f3 | 2274 | if (type == RTN_MULTICAST) { |
1da177e4 | 2275 | if (IN_DEV_MFORWARD(in_dev) && |
813b3b5d | 2276 | !ipv4_is_local_multicast(fl4->daddr)) { |
d8d1f30b CG |
2277 | rth->dst.input = ip_mr_input; |
2278 | rth->dst.output = ip_mc_output; | |
1da177e4 LT |
2279 | } |
2280 | } | |
2281 | #endif | |
2282 | } | |
2283 | ||
a4c2fd7f | 2284 | rt_set_nexthop(rth, fl4->daddr, res, fnhe, fi, type, 0, do_cache); |
efd85700 | 2285 | set_lwt_redirect(rth); |
1da177e4 | 2286 | |
5ada5527 | 2287 | return rth; |
1da177e4 LT |
2288 | } |
2289 | ||
1da177e4 LT |
2290 | /* |
2291 | * Major route resolver routine. | |
2292 | */ | |
2293 | ||
3abd1ade DA |
2294 | struct rtable *ip_route_output_key_hash(struct net *net, struct flowi4 *fl4, |
2295 | const struct sk_buff *skb) | |
1da177e4 | 2296 | { |
f61759e6 | 2297 | __u8 tos = RT_FL_TOS(fl4); |
154ff3e0 ED |
2298 | struct fib_result res = { |
2299 | .type = RTN_UNSPEC, | |
2300 | .fi = NULL, | |
2301 | .table = NULL, | |
2302 | .tclassid = 0, | |
2303 | }; | |
5ada5527 | 2304 | struct rtable *rth; |
1da177e4 | 2305 | |
1fb9489b | 2306 | fl4->flowi4_iif = LOOPBACK_IFINDEX; |
813b3b5d DM |
2307 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; |
2308 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
2309 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
44713b67 | 2310 | |
010c2708 | 2311 | rcu_read_lock(); |
3abd1ade DA |
2312 | rth = ip_route_output_key_hash_rcu(net, fl4, &res, skb); |
2313 | rcu_read_unlock(); | |
2314 | ||
2315 | return rth; | |
2316 | } | |
2317 | EXPORT_SYMBOL_GPL(ip_route_output_key_hash); | |
2318 | ||
2319 | struct rtable *ip_route_output_key_hash_rcu(struct net *net, struct flowi4 *fl4, | |
2320 | struct fib_result *res, | |
2321 | const struct sk_buff *skb) | |
2322 | { | |
2323 | struct net_device *dev_out = NULL; | |
2324 | int orig_oif = fl4->flowi4_oif; | |
2325 | unsigned int flags = 0; | |
2326 | struct rtable *rth; | |
2327 | int err = -ENETUNREACH; | |
2328 | ||
813b3b5d | 2329 | if (fl4->saddr) { |
b23dd4fe | 2330 | rth = ERR_PTR(-EINVAL); |
813b3b5d DM |
2331 | if (ipv4_is_multicast(fl4->saddr) || |
2332 | ipv4_is_lbcast(fl4->saddr) || | |
2333 | ipv4_is_zeronet(fl4->saddr)) | |
1da177e4 LT |
2334 | goto out; |
2335 | ||
1da177e4 LT |
2336 | /* I removed check for oif == dev_out->oif here. |
2337 | It was wrong for two reasons: | |
1ab35276 DL |
2338 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
2339 | is assigned to multiple interfaces. | |
1da177e4 LT |
2340 | 2. Moreover, we are allowed to send packets with saddr |
2341 | of another iface. --ANK | |
2342 | */ | |
2343 | ||
813b3b5d DM |
2344 | if (fl4->flowi4_oif == 0 && |
2345 | (ipv4_is_multicast(fl4->daddr) || | |
2346 | ipv4_is_lbcast(fl4->daddr))) { | |
a210d01a | 2347 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 2348 | dev_out = __ip_dev_find(net, fl4->saddr, false); |
51456b29 | 2349 | if (!dev_out) |
a210d01a JA |
2350 | goto out; |
2351 | ||
1da177e4 LT |
2352 | /* Special hack: user can direct multicasts |
2353 | and limited broadcast via necessary interface | |
2354 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. | |
2355 | This hack is not just for fun, it allows | |
2356 | vic,vat and friends to work. | |
2357 | They bind socket to loopback, set ttl to zero | |
2358 | and expect that it will work. | |
2359 | From the viewpoint of routing cache they are broken, | |
2360 | because we are not allowed to build multicast path | |
2361 | with loopback source addr (look, routing cache | |
2362 | cannot know, that ttl is zero, so that packet | |
2363 | will not leave this host and route is valid). | |
2364 | Luckily, this hack is good workaround. | |
2365 | */ | |
2366 | ||
813b3b5d | 2367 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2368 | goto make_route; |
2369 | } | |
a210d01a | 2370 | |
813b3b5d | 2371 | if (!(fl4->flowi4_flags & FLOWI_FLAG_ANYSRC)) { |
a210d01a | 2372 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 2373 | if (!__ip_dev_find(net, fl4->saddr, false)) |
a210d01a | 2374 | goto out; |
a210d01a | 2375 | } |
1da177e4 LT |
2376 | } |
2377 | ||
2378 | ||
813b3b5d DM |
2379 | if (fl4->flowi4_oif) { |
2380 | dev_out = dev_get_by_index_rcu(net, fl4->flowi4_oif); | |
b23dd4fe | 2381 | rth = ERR_PTR(-ENODEV); |
51456b29 | 2382 | if (!dev_out) |
1da177e4 | 2383 | goto out; |
e5ed6399 HX |
2384 | |
2385 | /* RACE: Check return value of inet_select_addr instead. */ | |
fc75fc83 | 2386 | if (!(dev_out->flags & IFF_UP) || !__in_dev_get_rcu(dev_out)) { |
b23dd4fe | 2387 | rth = ERR_PTR(-ENETUNREACH); |
fc75fc83 ED |
2388 | goto out; |
2389 | } | |
813b3b5d | 2390 | if (ipv4_is_local_multicast(fl4->daddr) || |
6a211654 AL |
2391 | ipv4_is_lbcast(fl4->daddr) || |
2392 | fl4->flowi4_proto == IPPROTO_IGMP) { | |
813b3b5d DM |
2393 | if (!fl4->saddr) |
2394 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2395 | RT_SCOPE_LINK); | |
1da177e4 LT |
2396 | goto make_route; |
2397 | } | |
0a7e2260 | 2398 | if (!fl4->saddr) { |
813b3b5d DM |
2399 | if (ipv4_is_multicast(fl4->daddr)) |
2400 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2401 | fl4->flowi4_scope); | |
2402 | else if (!fl4->daddr) | |
2403 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2404 | RT_SCOPE_HOST); | |
1da177e4 LT |
2405 | } |
2406 | } | |
2407 | ||
813b3b5d DM |
2408 | if (!fl4->daddr) { |
2409 | fl4->daddr = fl4->saddr; | |
2410 | if (!fl4->daddr) | |
2411 | fl4->daddr = fl4->saddr = htonl(INADDR_LOOPBACK); | |
b40afd0e | 2412 | dev_out = net->loopback_dev; |
1fb9489b | 2413 | fl4->flowi4_oif = LOOPBACK_IFINDEX; |
3abd1ade | 2414 | res->type = RTN_LOCAL; |
1da177e4 LT |
2415 | flags |= RTCF_LOCAL; |
2416 | goto make_route; | |
2417 | } | |
2418 | ||
3abd1ade | 2419 | err = fib_lookup(net, fl4, res, 0); |
0315e382 | 2420 | if (err) { |
3abd1ade DA |
2421 | res->fi = NULL; |
2422 | res->table = NULL; | |
6104e112 | 2423 | if (fl4->flowi4_oif && |
e58e4159 DA |
2424 | (ipv4_is_multicast(fl4->daddr) || |
2425 | !netif_index_is_l3_master(net, fl4->flowi4_oif))) { | |
1da177e4 LT |
2426 | /* Apparently, routing tables are wrong. Assume, |
2427 | that the destination is on link. | |
2428 | ||
2429 | WHY? DW. | |
2430 | Because we are allowed to send to iface | |
2431 | even if it has NO routes and NO assigned | |
2432 | addresses. When oif is specified, routing | |
2433 | tables are looked up with only one purpose: | |
2434 | to catch if destination is gatewayed, rather than | |
2435 | direct. Moreover, if MSG_DONTROUTE is set, | |
2436 | we send packet, ignoring both routing tables | |
2437 | and ifaddr state. --ANK | |
2438 | ||
2439 | ||
2440 | We could make it even if oif is unknown, | |
2441 | likely IPv6, but we do not. | |
2442 | */ | |
2443 | ||
813b3b5d DM |
2444 | if (fl4->saddr == 0) |
2445 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2446 | RT_SCOPE_LINK); | |
3abd1ade | 2447 | res->type = RTN_UNICAST; |
1da177e4 LT |
2448 | goto make_route; |
2449 | } | |
0315e382 | 2450 | rth = ERR_PTR(err); |
1da177e4 LT |
2451 | goto out; |
2452 | } | |
1da177e4 | 2453 | |
3abd1ade | 2454 | if (res->type == RTN_LOCAL) { |
813b3b5d | 2455 | if (!fl4->saddr) { |
3abd1ade DA |
2456 | if (res->fi->fib_prefsrc) |
2457 | fl4->saddr = res->fi->fib_prefsrc; | |
9fc3bbb4 | 2458 | else |
813b3b5d | 2459 | fl4->saddr = fl4->daddr; |
9fc3bbb4 | 2460 | } |
5f02ce24 DA |
2461 | |
2462 | /* L3 master device is the loopback for that domain */ | |
3abd1ade | 2463 | dev_out = l3mdev_master_dev_rcu(FIB_RES_DEV(*res)) ? : |
b7c8487c | 2464 | net->loopback_dev; |
839da4d9 DA |
2465 | |
2466 | /* make sure orig_oif points to fib result device even | |
2467 | * though packet rx/tx happens over loopback or l3mdev | |
2468 | */ | |
2469 | orig_oif = FIB_RES_OIF(*res); | |
2470 | ||
813b3b5d | 2471 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2472 | flags |= RTCF_LOCAL; |
2473 | goto make_route; | |
2474 | } | |
2475 | ||
3abd1ade | 2476 | fib_select_path(net, res, fl4, skb); |
1da177e4 | 2477 | |
3abd1ade | 2478 | dev_out = FIB_RES_DEV(*res); |
813b3b5d | 2479 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2480 | |
2481 | ||
2482 | make_route: | |
3abd1ade | 2483 | rth = __mkroute_output(res, fl4, orig_oif, dev_out, flags); |
1da177e4 | 2484 | |
010c2708 | 2485 | out: |
b23dd4fe | 2486 | return rth; |
1da177e4 | 2487 | } |
d8c97a94 | 2488 | |
ae2688d5 JW |
2489 | static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 cookie) |
2490 | { | |
2491 | return NULL; | |
2492 | } | |
2493 | ||
ebb762f2 | 2494 | static unsigned int ipv4_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 2495 | { |
618f9bc7 SK |
2496 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
2497 | ||
2498 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
2499 | } |
2500 | ||
6700c270 DM |
2501 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
2502 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
2503 | { |
2504 | } | |
2505 | ||
6700c270 DM |
2506 | static void ipv4_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
2507 | struct sk_buff *skb) | |
b587ee3b DM |
2508 | { |
2509 | } | |
2510 | ||
0972ddb2 HB |
2511 | static u32 *ipv4_rt_blackhole_cow_metrics(struct dst_entry *dst, |
2512 | unsigned long old) | |
2513 | { | |
2514 | return NULL; | |
2515 | } | |
2516 | ||
14e50e57 DM |
2517 | static struct dst_ops ipv4_dst_blackhole_ops = { |
2518 | .family = AF_INET, | |
ae2688d5 | 2519 | .check = ipv4_blackhole_dst_check, |
ebb762f2 | 2520 | .mtu = ipv4_blackhole_mtu, |
214f45c9 | 2521 | .default_advmss = ipv4_default_advmss, |
14e50e57 | 2522 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, |
b587ee3b | 2523 | .redirect = ipv4_rt_blackhole_redirect, |
0972ddb2 | 2524 | .cow_metrics = ipv4_rt_blackhole_cow_metrics, |
d3aaeb38 | 2525 | .neigh_lookup = ipv4_neigh_lookup, |
14e50e57 DM |
2526 | }; |
2527 | ||
2774c131 | 2528 | struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 2529 | { |
2774c131 | 2530 | struct rtable *ort = (struct rtable *) dst_orig; |
f5b0a874 | 2531 | struct rtable *rt; |
14e50e57 | 2532 | |
6c0e7284 | 2533 | rt = dst_alloc(&ipv4_dst_blackhole_ops, NULL, 1, DST_OBSOLETE_DEAD, 0); |
14e50e57 | 2534 | if (rt) { |
d8d1f30b | 2535 | struct dst_entry *new = &rt->dst; |
14e50e57 | 2536 | |
14e50e57 | 2537 | new->__use = 1; |
352e512c | 2538 | new->input = dst_discard; |
ede2059d | 2539 | new->output = dst_discard_out; |
14e50e57 | 2540 | |
1dbe3252 | 2541 | new->dev = net->loopback_dev; |
14e50e57 DM |
2542 | if (new->dev) |
2543 | dev_hold(new->dev); | |
2544 | ||
9917e1e8 | 2545 | rt->rt_is_input = ort->rt_is_input; |
5e2b61f7 | 2546 | rt->rt_iif = ort->rt_iif; |
5943634f | 2547 | rt->rt_pmtu = ort->rt_pmtu; |
8387fbac | 2548 | rt->rt_mtu_locked = ort->rt_mtu_locked; |
14e50e57 | 2549 | |
ca4c3fc2 | 2550 | rt->rt_genid = rt_genid_ipv4(net); |
14e50e57 DM |
2551 | rt->rt_flags = ort->rt_flags; |
2552 | rt->rt_type = ort->rt_type; | |
14e50e57 | 2553 | rt->rt_gateway = ort->rt_gateway; |
155e8336 | 2554 | rt->rt_uses_gateway = ort->rt_uses_gateway; |
14e50e57 | 2555 | |
caacf05e | 2556 | INIT_LIST_HEAD(&rt->rt_uncached); |
14e50e57 DM |
2557 | } |
2558 | ||
2774c131 DM |
2559 | dst_release(dst_orig); |
2560 | ||
2561 | return rt ? &rt->dst : ERR_PTR(-ENOMEM); | |
14e50e57 DM |
2562 | } |
2563 | ||
9d6ec938 | 2564 | struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4, |
6f9c9615 | 2565 | const struct sock *sk) |
1da177e4 | 2566 | { |
9d6ec938 | 2567 | struct rtable *rt = __ip_route_output_key(net, flp4); |
1da177e4 | 2568 | |
b23dd4fe DM |
2569 | if (IS_ERR(rt)) |
2570 | return rt; | |
1da177e4 | 2571 | |
56157872 | 2572 | if (flp4->flowi4_proto) |
f92ee619 SK |
2573 | rt = (struct rtable *)xfrm_lookup_route(net, &rt->dst, |
2574 | flowi4_to_flowi(flp4), | |
2575 | sk, 0); | |
1da177e4 | 2576 | |
b23dd4fe | 2577 | return rt; |
1da177e4 | 2578 | } |
d8c97a94 ACM |
2579 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
2580 | ||
3765d35e | 2581 | /* called with rcu_read_lock held */ |
c36ba660 | 2582 | static int rt_fill_info(struct net *net, __be32 dst, __be32 src, u32 table_id, |
15e47304 | 2583 | struct flowi4 *fl4, struct sk_buff *skb, u32 portid, |
ba52d61e | 2584 | u32 seq) |
1da177e4 | 2585 | { |
ba52d61e | 2586 | struct rtable *rt = skb_rtable(skb); |
1da177e4 | 2587 | struct rtmsg *r; |
be403ea1 | 2588 | struct nlmsghdr *nlh; |
2bc8ca40 | 2589 | unsigned long expires = 0; |
f185071d | 2590 | u32 error; |
521f5490 | 2591 | u32 metrics[RTAX_MAX]; |
be403ea1 | 2592 | |
d3166e0c | 2593 | nlh = nlmsg_put(skb, portid, seq, RTM_NEWROUTE, sizeof(*r), 0); |
51456b29 | 2594 | if (!nlh) |
26932566 | 2595 | return -EMSGSIZE; |
be403ea1 TG |
2596 | |
2597 | r = nlmsg_data(nlh); | |
1da177e4 LT |
2598 | r->rtm_family = AF_INET; |
2599 | r->rtm_dst_len = 32; | |
2600 | r->rtm_src_len = 0; | |
d6c0a4f6 | 2601 | r->rtm_tos = fl4->flowi4_tos; |
8a430ed5 | 2602 | r->rtm_table = table_id < 256 ? table_id : RT_TABLE_COMPAT; |
c36ba660 | 2603 | if (nla_put_u32(skb, RTA_TABLE, table_id)) |
f3756b79 | 2604 | goto nla_put_failure; |
1da177e4 LT |
2605 | r->rtm_type = rt->rt_type; |
2606 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2607 | r->rtm_protocol = RTPROT_UNSPEC; | |
2608 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
2609 | if (rt->rt_flags & RTCF_NOTIFY) | |
2610 | r->rtm_flags |= RTM_F_NOTIFY; | |
df4d9254 HFS |
2611 | if (IPCB(skb)->flags & IPSKB_DOREDIRECT) |
2612 | r->rtm_flags |= RTCF_DOREDIRECT; | |
be403ea1 | 2613 | |
930345ea | 2614 | if (nla_put_in_addr(skb, RTA_DST, dst)) |
f3756b79 | 2615 | goto nla_put_failure; |
1a00fee4 | 2616 | if (src) { |
1da177e4 | 2617 | r->rtm_src_len = 32; |
930345ea | 2618 | if (nla_put_in_addr(skb, RTA_SRC, src)) |
f3756b79 | 2619 | goto nla_put_failure; |
1da177e4 | 2620 | } |
f3756b79 DM |
2621 | if (rt->dst.dev && |
2622 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2623 | goto nla_put_failure; | |
c7066f70 | 2624 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
2625 | if (rt->dst.tclassid && |
2626 | nla_put_u32(skb, RTA_FLOW, rt->dst.tclassid)) | |
2627 | goto nla_put_failure; | |
1da177e4 | 2628 | #endif |
41347dcd | 2629 | if (!rt_is_input_route(rt) && |
d6c0a4f6 | 2630 | fl4->saddr != src) { |
930345ea | 2631 | if (nla_put_in_addr(skb, RTA_PREFSRC, fl4->saddr)) |
f3756b79 DM |
2632 | goto nla_put_failure; |
2633 | } | |
155e8336 | 2634 | if (rt->rt_uses_gateway && |
930345ea | 2635 | nla_put_in_addr(skb, RTA_GATEWAY, rt->rt_gateway)) |
f3756b79 | 2636 | goto nla_put_failure; |
be403ea1 | 2637 | |
ee9a8f7a SK |
2638 | expires = rt->dst.expires; |
2639 | if (expires) { | |
2640 | unsigned long now = jiffies; | |
2641 | ||
2642 | if (time_before(now, expires)) | |
2643 | expires -= now; | |
2644 | else | |
2645 | expires = 0; | |
2646 | } | |
2647 | ||
521f5490 | 2648 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
ee9a8f7a | 2649 | if (rt->rt_pmtu && expires) |
521f5490 | 2650 | metrics[RTAX_MTU - 1] = rt->rt_pmtu; |
8387fbac SD |
2651 | if (rt->rt_mtu_locked && expires) |
2652 | metrics[RTAX_LOCK - 1] |= BIT(RTAX_MTU); | |
521f5490 | 2653 | if (rtnetlink_put_metrics(skb, metrics) < 0) |
be403ea1 TG |
2654 | goto nla_put_failure; |
2655 | ||
b4869889 | 2656 | if (fl4->flowi4_mark && |
68aaed54 | 2657 | nla_put_u32(skb, RTA_MARK, fl4->flowi4_mark)) |
f3756b79 | 2658 | goto nla_put_failure; |
963bfeee | 2659 | |
622ec2c9 LC |
2660 | if (!uid_eq(fl4->flowi4_uid, INVALID_UID) && |
2661 | nla_put_u32(skb, RTA_UID, | |
2662 | from_kuid_munged(current_user_ns(), fl4->flowi4_uid))) | |
2663 | goto nla_put_failure; | |
2664 | ||
d8d1f30b | 2665 | error = rt->dst.error; |
be403ea1 | 2666 | |
c7537967 | 2667 | if (rt_is_input_route(rt)) { |
8caaf7b6 ND |
2668 | #ifdef CONFIG_IP_MROUTE |
2669 | if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) && | |
2670 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)) { | |
2671 | int err = ipmr_get_route(net, skb, | |
2672 | fl4->saddr, fl4->daddr, | |
9f09eaea | 2673 | r, portid); |
2cf75070 | 2674 | |
8caaf7b6 | 2675 | if (err <= 0) { |
0c8d803f DA |
2676 | if (err == 0) |
2677 | return 0; | |
2678 | goto nla_put_failure; | |
8caaf7b6 ND |
2679 | } |
2680 | } else | |
2681 | #endif | |
91146153 | 2682 | if (nla_put_u32(skb, RTA_IIF, skb->dev->ifindex)) |
8caaf7b6 | 2683 | goto nla_put_failure; |
1da177e4 LT |
2684 | } |
2685 | ||
f185071d | 2686 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, error) < 0) |
e3703b3d | 2687 | goto nla_put_failure; |
be403ea1 | 2688 | |
053c095a JB |
2689 | nlmsg_end(skb, nlh); |
2690 | return 0; | |
1da177e4 | 2691 | |
be403ea1 | 2692 | nla_put_failure: |
26932566 PM |
2693 | nlmsg_cancel(skb, nlh); |
2694 | return -EMSGSIZE; | |
1da177e4 LT |
2695 | } |
2696 | ||
c21ef3e3 DA |
2697 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
2698 | struct netlink_ext_ack *extack) | |
1da177e4 | 2699 | { |
3b1e0a65 | 2700 | struct net *net = sock_net(in_skb->sk); |
d889ce3b TG |
2701 | struct rtmsg *rtm; |
2702 | struct nlattr *tb[RTA_MAX+1]; | |
3765d35e | 2703 | struct fib_result res = {}; |
1da177e4 | 2704 | struct rtable *rt = NULL; |
d6c0a4f6 | 2705 | struct flowi4 fl4; |
9e12bb22 AV |
2706 | __be32 dst = 0; |
2707 | __be32 src = 0; | |
2708 | u32 iif; | |
d889ce3b | 2709 | int err; |
963bfeee | 2710 | int mark; |
1da177e4 | 2711 | struct sk_buff *skb; |
c36ba660 | 2712 | u32 table_id = RT_TABLE_MAIN; |
622ec2c9 | 2713 | kuid_t uid; |
1da177e4 | 2714 | |
fceb6435 | 2715 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy, |
c21ef3e3 | 2716 | extack); |
d889ce3b TG |
2717 | if (err < 0) |
2718 | goto errout; | |
2719 | ||
2720 | rtm = nlmsg_data(nlh); | |
2721 | ||
1da177e4 | 2722 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
51456b29 | 2723 | if (!skb) { |
d889ce3b TG |
2724 | err = -ENOBUFS; |
2725 | goto errout; | |
2726 | } | |
1da177e4 LT |
2727 | |
2728 | /* Reserve room for dummy headers, this skb can pass | |
2729 | through good chunk of routing engine. | |
2730 | */ | |
459a98ed | 2731 | skb_reset_mac_header(skb); |
c1d2bbe1 | 2732 | skb_reset_network_header(skb); |
d2c962b8 | 2733 | |
67b61f6c JB |
2734 | src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0; |
2735 | dst = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0; | |
d889ce3b | 2736 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
963bfeee | 2737 | mark = tb[RTA_MARK] ? nla_get_u32(tb[RTA_MARK]) : 0; |
622ec2c9 LC |
2738 | if (tb[RTA_UID]) |
2739 | uid = make_kuid(current_user_ns(), nla_get_u32(tb[RTA_UID])); | |
2740 | else | |
2741 | uid = (iif ? INVALID_UID : current_uid()); | |
1da177e4 | 2742 | |
bbadb9a2 FL |
2743 | /* Bugfix: need to give ip_route_input enough of an IP header to |
2744 | * not gag. | |
2745 | */ | |
2746 | ip_hdr(skb)->protocol = IPPROTO_UDP; | |
2747 | ip_hdr(skb)->saddr = src; | |
2748 | ip_hdr(skb)->daddr = dst; | |
2749 | ||
2750 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); | |
2751 | ||
d6c0a4f6 DM |
2752 | memset(&fl4, 0, sizeof(fl4)); |
2753 | fl4.daddr = dst; | |
2754 | fl4.saddr = src; | |
2755 | fl4.flowi4_tos = rtm->rtm_tos; | |
2756 | fl4.flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0; | |
2757 | fl4.flowi4_mark = mark; | |
622ec2c9 | 2758 | fl4.flowi4_uid = uid; |
d6c0a4f6 | 2759 | |
3765d35e DA |
2760 | rcu_read_lock(); |
2761 | ||
1da177e4 | 2762 | if (iif) { |
d889ce3b TG |
2763 | struct net_device *dev; |
2764 | ||
3765d35e | 2765 | dev = dev_get_by_index_rcu(net, iif); |
51456b29 | 2766 | if (!dev) { |
d889ce3b TG |
2767 | err = -ENODEV; |
2768 | goto errout_free; | |
2769 | } | |
2770 | ||
1da177e4 LT |
2771 | skb->protocol = htons(ETH_P_IP); |
2772 | skb->dev = dev; | |
963bfeee | 2773 | skb->mark = mark; |
3765d35e DA |
2774 | err = ip_route_input_rcu(skb, dst, src, rtm->rtm_tos, |
2775 | dev, &res); | |
d889ce3b | 2776 | |
511c3f92 | 2777 | rt = skb_rtable(skb); |
d8d1f30b CG |
2778 | if (err == 0 && rt->dst.error) |
2779 | err = -rt->dst.error; | |
1da177e4 | 2780 | } else { |
c2fd0b21 | 2781 | fl4.flowi4_iif = LOOPBACK_IFINDEX; |
3765d35e | 2782 | rt = ip_route_output_key_hash_rcu(net, &fl4, &res, skb); |
b23dd4fe DM |
2783 | err = 0; |
2784 | if (IS_ERR(rt)) | |
2785 | err = PTR_ERR(rt); | |
2c87d63a FW |
2786 | else |
2787 | skb_dst_set(skb, &rt->dst); | |
1da177e4 | 2788 | } |
d889ce3b | 2789 | |
1da177e4 | 2790 | if (err) |
d889ce3b | 2791 | goto errout_free; |
1da177e4 | 2792 | |
1da177e4 LT |
2793 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
2794 | rt->rt_flags |= RTCF_NOTIFY; | |
2795 | ||
c36ba660 DA |
2796 | if (rtm->rtm_flags & RTM_F_LOOKUP_TABLE) |
2797 | table_id = rt->rt_table_id; | |
2798 | ||
bc3aae2b RP |
2799 | if (rtm->rtm_flags & RTM_F_FIB_MATCH) { |
2800 | if (!res.fi) { | |
2801 | err = fib_props[res.type].error; | |
2802 | if (!err) | |
2803 | err = -EHOSTUNREACH; | |
2804 | goto errout_free; | |
2805 | } | |
b6179813 RP |
2806 | err = fib_dump_info(skb, NETLINK_CB(in_skb).portid, |
2807 | nlh->nlmsg_seq, RTM_NEWROUTE, table_id, | |
2808 | rt->rt_type, res.prefix, res.prefixlen, | |
2809 | fl4.flowi4_tos, res.fi, 0); | |
bc3aae2b | 2810 | } else { |
b6179813 | 2811 | err = rt_fill_info(net, dst, src, table_id, &fl4, skb, |
ba52d61e | 2812 | NETLINK_CB(in_skb).portid, nlh->nlmsg_seq); |
bc3aae2b | 2813 | } |
7b46a644 | 2814 | if (err < 0) |
d889ce3b | 2815 | goto errout_free; |
1da177e4 | 2816 | |
3765d35e DA |
2817 | rcu_read_unlock(); |
2818 | ||
15e47304 | 2819 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
d889ce3b | 2820 | errout: |
2942e900 | 2821 | return err; |
1da177e4 | 2822 | |
d889ce3b | 2823 | errout_free: |
3765d35e | 2824 | rcu_read_unlock(); |
1da177e4 | 2825 | kfree_skb(skb); |
d889ce3b | 2826 | goto errout; |
1da177e4 LT |
2827 | } |
2828 | ||
1da177e4 LT |
2829 | void ip_rt_multicast_event(struct in_device *in_dev) |
2830 | { | |
4ccfe6d4 | 2831 | rt_cache_flush(dev_net(in_dev->dev)); |
1da177e4 LT |
2832 | } |
2833 | ||
2834 | #ifdef CONFIG_SYSCTL | |
082c7ca4 G |
2835 | static int ip_rt_gc_interval __read_mostly = 60 * HZ; |
2836 | static int ip_rt_gc_min_interval __read_mostly = HZ / 2; | |
2837 | static int ip_rt_gc_elasticity __read_mostly = 8; | |
2838 | ||
fe2c6338 | 2839 | static int ipv4_sysctl_rtcache_flush(struct ctl_table *__ctl, int write, |
8d65af78 | 2840 | void __user *buffer, |
1da177e4 LT |
2841 | size_t *lenp, loff_t *ppos) |
2842 | { | |
5aad1de5 TT |
2843 | struct net *net = (struct net *)__ctl->extra1; |
2844 | ||
1da177e4 | 2845 | if (write) { |
5aad1de5 TT |
2846 | rt_cache_flush(net); |
2847 | fnhe_genid_bump(net); | |
1da177e4 | 2848 | return 0; |
e905a9ed | 2849 | } |
1da177e4 LT |
2850 | |
2851 | return -EINVAL; | |
2852 | } | |
2853 | ||
fe2c6338 | 2854 | static struct ctl_table ipv4_route_table[] = { |
1da177e4 | 2855 | { |
1da177e4 LT |
2856 | .procname = "gc_thresh", |
2857 | .data = &ipv4_dst_ops.gc_thresh, | |
2858 | .maxlen = sizeof(int), | |
2859 | .mode = 0644, | |
6d9f239a | 2860 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2861 | }, |
2862 | { | |
1da177e4 LT |
2863 | .procname = "max_size", |
2864 | .data = &ip_rt_max_size, | |
2865 | .maxlen = sizeof(int), | |
2866 | .mode = 0644, | |
6d9f239a | 2867 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2868 | }, |
2869 | { | |
2870 | /* Deprecated. Use gc_min_interval_ms */ | |
e905a9ed | 2871 | |
1da177e4 LT |
2872 | .procname = "gc_min_interval", |
2873 | .data = &ip_rt_gc_min_interval, | |
2874 | .maxlen = sizeof(int), | |
2875 | .mode = 0644, | |
6d9f239a | 2876 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2877 | }, |
2878 | { | |
1da177e4 LT |
2879 | .procname = "gc_min_interval_ms", |
2880 | .data = &ip_rt_gc_min_interval, | |
2881 | .maxlen = sizeof(int), | |
2882 | .mode = 0644, | |
6d9f239a | 2883 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 LT |
2884 | }, |
2885 | { | |
1da177e4 LT |
2886 | .procname = "gc_timeout", |
2887 | .data = &ip_rt_gc_timeout, | |
2888 | .maxlen = sizeof(int), | |
2889 | .mode = 0644, | |
6d9f239a | 2890 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 | 2891 | }, |
9f28a2fc ED |
2892 | { |
2893 | .procname = "gc_interval", | |
2894 | .data = &ip_rt_gc_interval, | |
2895 | .maxlen = sizeof(int), | |
2896 | .mode = 0644, | |
2897 | .proc_handler = proc_dointvec_jiffies, | |
2898 | }, | |
1da177e4 | 2899 | { |
1da177e4 LT |
2900 | .procname = "redirect_load", |
2901 | .data = &ip_rt_redirect_load, | |
2902 | .maxlen = sizeof(int), | |
2903 | .mode = 0644, | |
6d9f239a | 2904 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2905 | }, |
2906 | { | |
1da177e4 LT |
2907 | .procname = "redirect_number", |
2908 | .data = &ip_rt_redirect_number, | |
2909 | .maxlen = sizeof(int), | |
2910 | .mode = 0644, | |
6d9f239a | 2911 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2912 | }, |
2913 | { | |
1da177e4 LT |
2914 | .procname = "redirect_silence", |
2915 | .data = &ip_rt_redirect_silence, | |
2916 | .maxlen = sizeof(int), | |
2917 | .mode = 0644, | |
6d9f239a | 2918 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2919 | }, |
2920 | { | |
1da177e4 LT |
2921 | .procname = "error_cost", |
2922 | .data = &ip_rt_error_cost, | |
2923 | .maxlen = sizeof(int), | |
2924 | .mode = 0644, | |
6d9f239a | 2925 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2926 | }, |
2927 | { | |
1da177e4 LT |
2928 | .procname = "error_burst", |
2929 | .data = &ip_rt_error_burst, | |
2930 | .maxlen = sizeof(int), | |
2931 | .mode = 0644, | |
6d9f239a | 2932 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2933 | }, |
2934 | { | |
1da177e4 LT |
2935 | .procname = "gc_elasticity", |
2936 | .data = &ip_rt_gc_elasticity, | |
2937 | .maxlen = sizeof(int), | |
2938 | .mode = 0644, | |
6d9f239a | 2939 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2940 | }, |
2941 | { | |
1da177e4 LT |
2942 | .procname = "mtu_expires", |
2943 | .data = &ip_rt_mtu_expires, | |
2944 | .maxlen = sizeof(int), | |
2945 | .mode = 0644, | |
6d9f239a | 2946 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2947 | }, |
2948 | { | |
1da177e4 LT |
2949 | .procname = "min_pmtu", |
2950 | .data = &ip_rt_min_pmtu, | |
2951 | .maxlen = sizeof(int), | |
2952 | .mode = 0644, | |
3bcf69f8 SD |
2953 | .proc_handler = proc_dointvec_minmax, |
2954 | .extra1 = &ip_min_valid_pmtu, | |
1da177e4 LT |
2955 | }, |
2956 | { | |
1da177e4 LT |
2957 | .procname = "min_adv_mss", |
2958 | .data = &ip_rt_min_advmss, | |
2959 | .maxlen = sizeof(int), | |
2960 | .mode = 0644, | |
6d9f239a | 2961 | .proc_handler = proc_dointvec, |
1da177e4 | 2962 | }, |
f8572d8f | 2963 | { } |
1da177e4 | 2964 | }; |
39a23e75 | 2965 | |
39a23e75 DL |
2966 | static struct ctl_table ipv4_route_flush_table[] = { |
2967 | { | |
39a23e75 DL |
2968 | .procname = "flush", |
2969 | .maxlen = sizeof(int), | |
2970 | .mode = 0200, | |
6d9f239a | 2971 | .proc_handler = ipv4_sysctl_rtcache_flush, |
39a23e75 | 2972 | }, |
f8572d8f | 2973 | { }, |
39a23e75 DL |
2974 | }; |
2975 | ||
2976 | static __net_init int sysctl_route_net_init(struct net *net) | |
2977 | { | |
2978 | struct ctl_table *tbl; | |
2979 | ||
2980 | tbl = ipv4_route_flush_table; | |
09ad9bc7 | 2981 | if (!net_eq(net, &init_net)) { |
39a23e75 | 2982 | tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL); |
51456b29 | 2983 | if (!tbl) |
39a23e75 | 2984 | goto err_dup; |
464dc801 EB |
2985 | |
2986 | /* Don't export sysctls to unprivileged users */ | |
2987 | if (net->user_ns != &init_user_ns) | |
2988 | tbl[0].procname = NULL; | |
39a23e75 DL |
2989 | } |
2990 | tbl[0].extra1 = net; | |
2991 | ||
ec8f23ce | 2992 | net->ipv4.route_hdr = register_net_sysctl(net, "net/ipv4/route", tbl); |
51456b29 | 2993 | if (!net->ipv4.route_hdr) |
39a23e75 DL |
2994 | goto err_reg; |
2995 | return 0; | |
2996 | ||
2997 | err_reg: | |
2998 | if (tbl != ipv4_route_flush_table) | |
2999 | kfree(tbl); | |
3000 | err_dup: | |
3001 | return -ENOMEM; | |
3002 | } | |
3003 | ||
3004 | static __net_exit void sysctl_route_net_exit(struct net *net) | |
3005 | { | |
3006 | struct ctl_table *tbl; | |
3007 | ||
3008 | tbl = net->ipv4.route_hdr->ctl_table_arg; | |
3009 | unregister_net_sysctl_table(net->ipv4.route_hdr); | |
3010 | BUG_ON(tbl == ipv4_route_flush_table); | |
3011 | kfree(tbl); | |
3012 | } | |
3013 | ||
3014 | static __net_initdata struct pernet_operations sysctl_route_ops = { | |
3015 | .init = sysctl_route_net_init, | |
3016 | .exit = sysctl_route_net_exit, | |
3017 | }; | |
1da177e4 LT |
3018 | #endif |
3019 | ||
3ee94372 | 3020 | static __net_init int rt_genid_init(struct net *net) |
9f5e97e5 | 3021 | { |
ca4c3fc2 | 3022 | atomic_set(&net->ipv4.rt_genid, 0); |
5aad1de5 | 3023 | atomic_set(&net->fnhe_genid, 0); |
7aed9f72 | 3024 | atomic_set(&net->ipv4.dev_addr_genid, get_random_int()); |
9f5e97e5 DL |
3025 | return 0; |
3026 | } | |
3027 | ||
3ee94372 NH |
3028 | static __net_initdata struct pernet_operations rt_genid_ops = { |
3029 | .init = rt_genid_init, | |
9f5e97e5 DL |
3030 | }; |
3031 | ||
c3426b47 DM |
3032 | static int __net_init ipv4_inetpeer_init(struct net *net) |
3033 | { | |
3034 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3035 | ||
3036 | if (!bp) | |
3037 | return -ENOMEM; | |
3038 | inet_peer_base_init(bp); | |
3039 | net->ipv4.peers = bp; | |
3040 | return 0; | |
3041 | } | |
3042 | ||
3043 | static void __net_exit ipv4_inetpeer_exit(struct net *net) | |
3044 | { | |
3045 | struct inet_peer_base *bp = net->ipv4.peers; | |
3046 | ||
3047 | net->ipv4.peers = NULL; | |
56a6b248 | 3048 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3049 | kfree(bp); |
3050 | } | |
3051 | ||
3052 | static __net_initdata struct pernet_operations ipv4_inetpeer_ops = { | |
3053 | .init = ipv4_inetpeer_init, | |
3054 | .exit = ipv4_inetpeer_exit, | |
3055 | }; | |
9f5e97e5 | 3056 | |
c7066f70 | 3057 | #ifdef CONFIG_IP_ROUTE_CLASSID |
7d720c3e | 3058 | struct ip_rt_acct __percpu *ip_rt_acct __read_mostly; |
c7066f70 | 3059 | #endif /* CONFIG_IP_ROUTE_CLASSID */ |
1da177e4 | 3060 | |
1da177e4 LT |
3061 | int __init ip_rt_init(void) |
3062 | { | |
424c4b70 | 3063 | int rc = 0; |
5055c371 | 3064 | int cpu; |
1da177e4 | 3065 | |
73f156a6 ED |
3066 | ip_idents = kmalloc(IP_IDENTS_SZ * sizeof(*ip_idents), GFP_KERNEL); |
3067 | if (!ip_idents) | |
3068 | panic("IP: failed to allocate ip_idents\n"); | |
3069 | ||
3070 | prandom_bytes(ip_idents, IP_IDENTS_SZ * sizeof(*ip_idents)); | |
3071 | ||
355b590c ED |
3072 | ip_tstamps = kcalloc(IP_IDENTS_SZ, sizeof(*ip_tstamps), GFP_KERNEL); |
3073 | if (!ip_tstamps) | |
3074 | panic("IP: failed to allocate ip_tstamps\n"); | |
3075 | ||
5055c371 ED |
3076 | for_each_possible_cpu(cpu) { |
3077 | struct uncached_list *ul = &per_cpu(rt_uncached_list, cpu); | |
3078 | ||
3079 | INIT_LIST_HEAD(&ul->head); | |
3080 | spin_lock_init(&ul->lock); | |
3081 | } | |
c7066f70 | 3082 | #ifdef CONFIG_IP_ROUTE_CLASSID |
0dcec8c2 | 3083 | ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct), __alignof__(struct ip_rt_acct)); |
1da177e4 LT |
3084 | if (!ip_rt_acct) |
3085 | panic("IP: failed to allocate ip_rt_acct\n"); | |
1da177e4 LT |
3086 | #endif |
3087 | ||
e5d679f3 AD |
3088 | ipv4_dst_ops.kmem_cachep = |
3089 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, | |
20c2df83 | 3090 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 | 3091 | |
14e50e57 DM |
3092 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
3093 | ||
fc66f95c ED |
3094 | if (dst_entries_init(&ipv4_dst_ops) < 0) |
3095 | panic("IP: failed to allocate ipv4_dst_ops counter\n"); | |
3096 | ||
3097 | if (dst_entries_init(&ipv4_dst_blackhole_ops) < 0) | |
3098 | panic("IP: failed to allocate ipv4_dst_blackhole_ops counter\n"); | |
3099 | ||
89aef892 DM |
3100 | ipv4_dst_ops.gc_thresh = ~0; |
3101 | ip_rt_max_size = INT_MAX; | |
1da177e4 | 3102 | |
1da177e4 LT |
3103 | devinet_init(); |
3104 | ip_fib_init(); | |
3105 | ||
73b38711 | 3106 | if (ip_rt_proc_init()) |
058bd4d2 | 3107 | pr_err("Unable to create route proc files\n"); |
1da177e4 LT |
3108 | #ifdef CONFIG_XFRM |
3109 | xfrm_init(); | |
703fb94e | 3110 | xfrm4_init(); |
1da177e4 | 3111 | #endif |
394f51ab FW |
3112 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL, |
3113 | RTNL_FLAG_DOIT_UNLOCKED); | |
63f3444f | 3114 | |
39a23e75 DL |
3115 | #ifdef CONFIG_SYSCTL |
3116 | register_pernet_subsys(&sysctl_route_ops); | |
3117 | #endif | |
3ee94372 | 3118 | register_pernet_subsys(&rt_genid_ops); |
c3426b47 | 3119 | register_pernet_subsys(&ipv4_inetpeer_ops); |
1da177e4 LT |
3120 | return rc; |
3121 | } | |
3122 | ||
a1bc6eb4 | 3123 | #ifdef CONFIG_SYSCTL |
eeb61f71 AV |
3124 | /* |
3125 | * We really need to sanitize the damn ipv4 init order, then all | |
3126 | * this nonsense will go away. | |
3127 | */ | |
3128 | void __init ip_static_sysctl_init(void) | |
3129 | { | |
4e5ca785 | 3130 | register_net_sysctl(&init_net, "net/ipv4/route", ipv4_route_table); |
eeb61f71 | 3131 | } |
a1bc6eb4 | 3132 | #endif |