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.
6 * ROUTE - implementation of the IP router.
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>
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
21 * Alan Cox : Super /proc >4K
22 * Alan Cox : MTU in route table
23 * Alan Cox : MSS actually. Also added the window
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.
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
55 * Eric Dumazet : hashed spinlocks and rt_check_expire() fixes.
56 * Ilia Sotnikov : Ignore TOS on PMTUD and Redirect
57 * Ilia Sotnikov : Removed TOS from hash calculations
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.
65 #define pr_fmt(fmt) "IPv4: " fmt
67 #include <linux/module.h>
68 #include <linux/uaccess.h>
69 #include <linux/bitops.h>
70 #include <linux/types.h>
71 #include <linux/kernel.h>
73 #include <linux/string.h>
74 #include <linux/socket.h>
75 #include <linux/sockios.h>
76 #include <linux/errno.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>
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>
89 #include <linux/rcupdate.h>
90 #include <linux/times.h>
91 #include <linux/slab.h>
92 #include <linux/jhash.h>
94 #include <net/dst_metadata.h>
95 #include <net/net_namespace.h>
96 #include <net/protocol.h>
98 #include <net/route.h>
99 #include <net/inetpeer.h>
100 #include <net/sock.h>
101 #include <net/ip_fib.h>
104 #include <net/icmp.h>
105 #include <net/xfrm.h>
106 #include <net/lwtunnel.h>
107 #include <net/netevent.h>
108 #include <net/rtnetlink.h>
110 #include <linux/sysctl.h>
111 #include <linux/kmemleak.h>
113 #include <net/secure_seq.h>
114 #include <net/ip_tunnels.h>
115 #include <net/l3mdev.h>
117 #include "fib_lookup.h"
119 #define RT_FL_TOS(oldflp4) \
120 ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK))
122 #define RT_GC_TIMEOUT (300*HZ)
124 static int ip_rt_max_size
;
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
;
130 static int ip_rt_mtu_expires __read_mostly
= 10 * 60 * HZ
;
131 static int ip_rt_min_pmtu __read_mostly
= 512 + 20 + 20;
132 static int ip_rt_min_advmss __read_mostly
= 256;
134 static int ip_rt_gc_timeout __read_mostly
= RT_GC_TIMEOUT
;
136 * Interface to generic destination cache.
139 static struct dst_entry
*ipv4_dst_check(struct dst_entry
*dst
, u32 cookie
);
140 static unsigned int ipv4_default_advmss(const struct dst_entry
*dst
);
141 static unsigned int ipv4_mtu(const struct dst_entry
*dst
);
142 static struct dst_entry
*ipv4_negative_advice(struct dst_entry
*dst
);
143 static void ipv4_link_failure(struct sk_buff
*skb
);
144 static void ip_rt_update_pmtu(struct dst_entry
*dst
, struct sock
*sk
,
145 struct sk_buff
*skb
, u32 mtu
);
146 static void ip_do_redirect(struct dst_entry
*dst
, struct sock
*sk
,
147 struct sk_buff
*skb
);
148 static void ipv4_dst_destroy(struct dst_entry
*dst
);
150 static u32
*ipv4_cow_metrics(struct dst_entry
*dst
, unsigned long old
)
156 static struct neighbour
*ipv4_neigh_lookup(const struct dst_entry
*dst
,
159 static void ipv4_confirm_neigh(const struct dst_entry
*dst
, const void *daddr
);
161 static struct dst_ops ipv4_dst_ops
= {
163 .check
= ipv4_dst_check
,
164 .default_advmss
= ipv4_default_advmss
,
166 .cow_metrics
= ipv4_cow_metrics
,
167 .destroy
= ipv4_dst_destroy
,
168 .negative_advice
= ipv4_negative_advice
,
169 .link_failure
= ipv4_link_failure
,
170 .update_pmtu
= ip_rt_update_pmtu
,
171 .redirect
= ip_do_redirect
,
172 .local_out
= __ip_local_out
,
173 .neigh_lookup
= ipv4_neigh_lookup
,
174 .confirm_neigh
= ipv4_confirm_neigh
,
177 #define ECN_OR_COST(class) TC_PRIO_##class
179 const __u8 ip_tos2prio
[16] = {
181 ECN_OR_COST(BESTEFFORT
),
183 ECN_OR_COST(BESTEFFORT
),
189 ECN_OR_COST(INTERACTIVE
),
191 ECN_OR_COST(INTERACTIVE
),
192 TC_PRIO_INTERACTIVE_BULK
,
193 ECN_OR_COST(INTERACTIVE_BULK
),
194 TC_PRIO_INTERACTIVE_BULK
,
195 ECN_OR_COST(INTERACTIVE_BULK
)
197 EXPORT_SYMBOL(ip_tos2prio
);
199 static DEFINE_PER_CPU(struct rt_cache_stat
, rt_cache_stat
);
200 #define RT_CACHE_STAT_INC(field) raw_cpu_inc(rt_cache_stat.field)
202 #ifdef CONFIG_PROC_FS
203 static void *rt_cache_seq_start(struct seq_file
*seq
, loff_t
*pos
)
207 return SEQ_START_TOKEN
;
210 static void *rt_cache_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
216 static void rt_cache_seq_stop(struct seq_file
*seq
, void *v
)
220 static int rt_cache_seq_show(struct seq_file
*seq
, void *v
)
222 if (v
== SEQ_START_TOKEN
)
223 seq_printf(seq
, "%-127s\n",
224 "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t"
225 "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t"
230 static const struct seq_operations rt_cache_seq_ops
= {
231 .start
= rt_cache_seq_start
,
232 .next
= rt_cache_seq_next
,
233 .stop
= rt_cache_seq_stop
,
234 .show
= rt_cache_seq_show
,
237 static int rt_cache_seq_open(struct inode
*inode
, struct file
*file
)
239 return seq_open(file
, &rt_cache_seq_ops
);
242 static const struct file_operations rt_cache_seq_fops
= {
243 .owner
= THIS_MODULE
,
244 .open
= rt_cache_seq_open
,
247 .release
= seq_release
,
251 static void *rt_cpu_seq_start(struct seq_file
*seq
, loff_t
*pos
)
256 return SEQ_START_TOKEN
;
258 for (cpu
= *pos
-1; cpu
< nr_cpu_ids
; ++cpu
) {
259 if (!cpu_possible(cpu
))
262 return &per_cpu(rt_cache_stat
, cpu
);
267 static void *rt_cpu_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
271 for (cpu
= *pos
; cpu
< nr_cpu_ids
; ++cpu
) {
272 if (!cpu_possible(cpu
))
275 return &per_cpu(rt_cache_stat
, cpu
);
281 static void rt_cpu_seq_stop(struct seq_file
*seq
, void *v
)
286 static int rt_cpu_seq_show(struct seq_file
*seq
, void *v
)
288 struct rt_cache_stat
*st
= v
;
290 if (v
== SEQ_START_TOKEN
) {
291 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");
295 seq_printf(seq
,"%08x %08x %08x %08x %08x %08x %08x %08x "
296 " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n",
297 dst_entries_get_slow(&ipv4_dst_ops
),
310 0, /* st->gc_total */
311 0, /* st->gc_ignored */
312 0, /* st->gc_goal_miss */
313 0, /* st->gc_dst_overflow */
314 0, /* st->in_hlist_search */
315 0 /* st->out_hlist_search */
320 static const struct seq_operations rt_cpu_seq_ops
= {
321 .start
= rt_cpu_seq_start
,
322 .next
= rt_cpu_seq_next
,
323 .stop
= rt_cpu_seq_stop
,
324 .show
= rt_cpu_seq_show
,
328 static int rt_cpu_seq_open(struct inode
*inode
, struct file
*file
)
330 return seq_open(file
, &rt_cpu_seq_ops
);
333 static const struct file_operations rt_cpu_seq_fops
= {
334 .owner
= THIS_MODULE
,
335 .open
= rt_cpu_seq_open
,
338 .release
= seq_release
,
341 #ifdef CONFIG_IP_ROUTE_CLASSID
342 static int rt_acct_proc_show(struct seq_file
*m
, void *v
)
344 struct ip_rt_acct
*dst
, *src
;
347 dst
= kcalloc(256, sizeof(struct ip_rt_acct
), GFP_KERNEL
);
351 for_each_possible_cpu(i
) {
352 src
= (struct ip_rt_acct
*)per_cpu_ptr(ip_rt_acct
, i
);
353 for (j
= 0; j
< 256; j
++) {
354 dst
[j
].o_bytes
+= src
[j
].o_bytes
;
355 dst
[j
].o_packets
+= src
[j
].o_packets
;
356 dst
[j
].i_bytes
+= src
[j
].i_bytes
;
357 dst
[j
].i_packets
+= src
[j
].i_packets
;
361 seq_write(m
, dst
, 256 * sizeof(struct ip_rt_acct
));
366 static int rt_acct_proc_open(struct inode
*inode
, struct file
*file
)
368 return single_open(file
, rt_acct_proc_show
, NULL
);
371 static const struct file_operations rt_acct_proc_fops
= {
372 .owner
= THIS_MODULE
,
373 .open
= rt_acct_proc_open
,
376 .release
= single_release
,
380 static int __net_init
ip_rt_do_proc_init(struct net
*net
)
382 struct proc_dir_entry
*pde
;
384 pde
= proc_create("rt_cache", S_IRUGO
, net
->proc_net
,
389 pde
= proc_create("rt_cache", S_IRUGO
,
390 net
->proc_net_stat
, &rt_cpu_seq_fops
);
394 #ifdef CONFIG_IP_ROUTE_CLASSID
395 pde
= proc_create("rt_acct", 0, net
->proc_net
, &rt_acct_proc_fops
);
401 #ifdef CONFIG_IP_ROUTE_CLASSID
403 remove_proc_entry("rt_cache", net
->proc_net_stat
);
406 remove_proc_entry("rt_cache", net
->proc_net
);
411 static void __net_exit
ip_rt_do_proc_exit(struct net
*net
)
413 remove_proc_entry("rt_cache", net
->proc_net_stat
);
414 remove_proc_entry("rt_cache", net
->proc_net
);
415 #ifdef CONFIG_IP_ROUTE_CLASSID
416 remove_proc_entry("rt_acct", net
->proc_net
);
420 static struct pernet_operations ip_rt_proc_ops __net_initdata
= {
421 .init
= ip_rt_do_proc_init
,
422 .exit
= ip_rt_do_proc_exit
,
425 static int __init
ip_rt_proc_init(void)
427 return register_pernet_subsys(&ip_rt_proc_ops
);
431 static inline int ip_rt_proc_init(void)
435 #endif /* CONFIG_PROC_FS */
437 static inline bool rt_is_expired(const struct rtable
*rth
)
439 return rth
->rt_genid
!= rt_genid_ipv4(dev_net(rth
->dst
.dev
));
442 void rt_cache_flush(struct net
*net
)
444 rt_genid_bump_ipv4(net
);
447 static struct neighbour
*ipv4_neigh_lookup(const struct dst_entry
*dst
,
451 struct net_device
*dev
= dst
->dev
;
452 const __be32
*pkey
= daddr
;
453 const struct rtable
*rt
;
456 rt
= (const struct rtable
*) dst
;
458 pkey
= (const __be32
*) &rt
->rt_gateway
;
460 pkey
= &ip_hdr(skb
)->daddr
;
462 n
= __ipv4_neigh_lookup(dev
, *(__force u32
*)pkey
);
465 return neigh_create(&arp_tbl
, pkey
, dev
);
468 static void ipv4_confirm_neigh(const struct dst_entry
*dst
, const void *daddr
)
470 struct net_device
*dev
= dst
->dev
;
471 const __be32
*pkey
= daddr
;
472 const struct rtable
*rt
;
474 rt
= (const struct rtable
*)dst
;
476 pkey
= (const __be32
*)&rt
->rt_gateway
;
479 (RTCF_MULTICAST
| RTCF_BROADCAST
| RTCF_LOCAL
)))
482 __ipv4_confirm_neigh(dev
, *(__force u32
*)pkey
);
485 #define IP_IDENTS_SZ 2048u
487 static atomic_t
*ip_idents __read_mostly
;
488 static u32
*ip_tstamps __read_mostly
;
490 /* In order to protect privacy, we add a perturbation to identifiers
491 * if one generator is seldom used. This makes hard for an attacker
492 * to infer how many packets were sent between two points in time.
494 u32
ip_idents_reserve(u32 hash
, int segs
)
496 u32
*p_tstamp
= ip_tstamps
+ hash
% IP_IDENTS_SZ
;
497 atomic_t
*p_id
= ip_idents
+ hash
% IP_IDENTS_SZ
;
498 u32 old
= ACCESS_ONCE(*p_tstamp
);
499 u32 now
= (u32
)jiffies
;
502 if (old
!= now
&& cmpxchg(p_tstamp
, old
, now
) == old
)
503 delta
= prandom_u32_max(now
- old
);
505 /* Do not use atomic_add_return() as it makes UBSAN unhappy */
507 old
= (u32
)atomic_read(p_id
);
508 new = old
+ delta
+ segs
;
509 } while (atomic_cmpxchg(p_id
, old
, new) != old
);
513 EXPORT_SYMBOL(ip_idents_reserve
);
515 void __ip_select_ident(struct net
*net
, struct iphdr
*iph
, int segs
)
517 static u32 ip_idents_hashrnd __read_mostly
;
520 net_get_random_once(&ip_idents_hashrnd
, sizeof(ip_idents_hashrnd
));
522 hash
= jhash_3words((__force u32
)iph
->daddr
,
523 (__force u32
)iph
->saddr
,
524 iph
->protocol
^ net_hash_mix(net
),
526 id
= ip_idents_reserve(hash
, segs
);
529 EXPORT_SYMBOL(__ip_select_ident
);
531 static void __build_flow_key(const struct net
*net
, struct flowi4
*fl4
,
532 const struct sock
*sk
,
533 const struct iphdr
*iph
,
535 u8 prot
, u32 mark
, int flow_flags
)
538 const struct inet_sock
*inet
= inet_sk(sk
);
540 oif
= sk
->sk_bound_dev_if
;
542 tos
= RT_CONN_FLAGS(sk
);
543 prot
= inet
->hdrincl
? IPPROTO_RAW
: sk
->sk_protocol
;
545 flowi4_init_output(fl4
, oif
, mark
, tos
,
546 RT_SCOPE_UNIVERSE
, prot
,
548 iph
->daddr
, iph
->saddr
, 0, 0,
549 sock_net_uid(net
, sk
));
552 static void build_skb_flow_key(struct flowi4
*fl4
, const struct sk_buff
*skb
,
553 const struct sock
*sk
)
555 const struct net
*net
= dev_net(skb
->dev
);
556 const struct iphdr
*iph
= ip_hdr(skb
);
557 int oif
= skb
->dev
->ifindex
;
558 u8 tos
= RT_TOS(iph
->tos
);
559 u8 prot
= iph
->protocol
;
560 u32 mark
= skb
->mark
;
562 __build_flow_key(net
, fl4
, sk
, iph
, oif
, tos
, prot
, mark
, 0);
565 static void build_sk_flow_key(struct flowi4
*fl4
, const struct sock
*sk
)
567 const struct inet_sock
*inet
= inet_sk(sk
);
568 const struct ip_options_rcu
*inet_opt
;
569 __be32 daddr
= inet
->inet_daddr
;
572 inet_opt
= rcu_dereference(inet
->inet_opt
);
573 if (inet_opt
&& inet_opt
->opt
.srr
)
574 daddr
= inet_opt
->opt
.faddr
;
575 flowi4_init_output(fl4
, sk
->sk_bound_dev_if
, sk
->sk_mark
,
576 RT_CONN_FLAGS(sk
), RT_SCOPE_UNIVERSE
,
577 inet
->hdrincl
? IPPROTO_RAW
: sk
->sk_protocol
,
578 inet_sk_flowi_flags(sk
),
579 daddr
, inet
->inet_saddr
, 0, 0, sk
->sk_uid
);
583 static void ip_rt_build_flow_key(struct flowi4
*fl4
, const struct sock
*sk
,
584 const struct sk_buff
*skb
)
587 build_skb_flow_key(fl4
, skb
, sk
);
589 build_sk_flow_key(fl4
, sk
);
592 static DEFINE_SPINLOCK(fnhe_lock
);
594 static void fnhe_flush_routes(struct fib_nh_exception
*fnhe
)
598 rt
= rcu_dereference(fnhe
->fnhe_rth_input
);
600 RCU_INIT_POINTER(fnhe
->fnhe_rth_input
, NULL
);
601 dst_dev_put(&rt
->dst
);
602 dst_release(&rt
->dst
);
604 rt
= rcu_dereference(fnhe
->fnhe_rth_output
);
606 RCU_INIT_POINTER(fnhe
->fnhe_rth_output
, NULL
);
607 dst_dev_put(&rt
->dst
);
608 dst_release(&rt
->dst
);
612 static struct fib_nh_exception
*fnhe_oldest(struct fnhe_hash_bucket
*hash
)
614 struct fib_nh_exception
*fnhe
, *oldest
;
616 oldest
= rcu_dereference(hash
->chain
);
617 for (fnhe
= rcu_dereference(oldest
->fnhe_next
); fnhe
;
618 fnhe
= rcu_dereference(fnhe
->fnhe_next
)) {
619 if (time_before(fnhe
->fnhe_stamp
, oldest
->fnhe_stamp
))
622 fnhe_flush_routes(oldest
);
626 static inline u32
fnhe_hashfun(__be32 daddr
)
628 static u32 fnhe_hashrnd __read_mostly
;
631 net_get_random_once(&fnhe_hashrnd
, sizeof(fnhe_hashrnd
));
632 hval
= jhash_1word((__force u32
) daddr
, fnhe_hashrnd
);
633 return hash_32(hval
, FNHE_HASH_SHIFT
);
636 static void fill_route_from_fnhe(struct rtable
*rt
, struct fib_nh_exception
*fnhe
)
638 rt
->rt_pmtu
= fnhe
->fnhe_pmtu
;
639 rt
->dst
.expires
= fnhe
->fnhe_expires
;
642 rt
->rt_flags
|= RTCF_REDIRECTED
;
643 rt
->rt_gateway
= fnhe
->fnhe_gw
;
644 rt
->rt_uses_gateway
= 1;
648 static void update_or_create_fnhe(struct fib_nh
*nh
, __be32 daddr
, __be32 gw
,
649 u32 pmtu
, unsigned long expires
)
651 struct fnhe_hash_bucket
*hash
;
652 struct fib_nh_exception
*fnhe
;
656 u32 hval
= fnhe_hashfun(daddr
);
658 spin_lock_bh(&fnhe_lock
);
660 hash
= rcu_dereference(nh
->nh_exceptions
);
662 hash
= kzalloc(FNHE_HASH_SIZE
* sizeof(*hash
), GFP_ATOMIC
);
665 rcu_assign_pointer(nh
->nh_exceptions
, hash
);
671 for (fnhe
= rcu_dereference(hash
->chain
); fnhe
;
672 fnhe
= rcu_dereference(fnhe
->fnhe_next
)) {
673 if (fnhe
->fnhe_daddr
== daddr
)
682 fnhe
->fnhe_pmtu
= pmtu
;
683 fnhe
->fnhe_expires
= max(1UL, expires
);
685 /* Update all cached dsts too */
686 rt
= rcu_dereference(fnhe
->fnhe_rth_input
);
688 fill_route_from_fnhe(rt
, fnhe
);
689 rt
= rcu_dereference(fnhe
->fnhe_rth_output
);
691 fill_route_from_fnhe(rt
, fnhe
);
693 if (depth
> FNHE_RECLAIM_DEPTH
)
694 fnhe
= fnhe_oldest(hash
);
696 fnhe
= kzalloc(sizeof(*fnhe
), GFP_ATOMIC
);
700 fnhe
->fnhe_next
= hash
->chain
;
701 rcu_assign_pointer(hash
->chain
, fnhe
);
703 fnhe
->fnhe_genid
= fnhe_genid(dev_net(nh
->nh_dev
));
704 fnhe
->fnhe_daddr
= daddr
;
706 fnhe
->fnhe_pmtu
= pmtu
;
707 fnhe
->fnhe_expires
= expires
;
709 /* Exception created; mark the cached routes for the nexthop
710 * stale, so anyone caching it rechecks if this exception
713 rt
= rcu_dereference(nh
->nh_rth_input
);
715 rt
->dst
.obsolete
= DST_OBSOLETE_KILL
;
717 for_each_possible_cpu(i
) {
718 struct rtable __rcu
**prt
;
719 prt
= per_cpu_ptr(nh
->nh_pcpu_rth_output
, i
);
720 rt
= rcu_dereference(*prt
);
722 rt
->dst
.obsolete
= DST_OBSOLETE_KILL
;
726 fnhe
->fnhe_stamp
= jiffies
;
729 spin_unlock_bh(&fnhe_lock
);
732 static void __ip_do_redirect(struct rtable
*rt
, struct sk_buff
*skb
, struct flowi4
*fl4
,
735 __be32 new_gw
= icmp_hdr(skb
)->un
.gateway
;
736 __be32 old_gw
= ip_hdr(skb
)->saddr
;
737 struct net_device
*dev
= skb
->dev
;
738 struct in_device
*in_dev
;
739 struct fib_result res
;
743 switch (icmp_hdr(skb
)->code
& 7) {
745 case ICMP_REDIR_NETTOS
:
746 case ICMP_REDIR_HOST
:
747 case ICMP_REDIR_HOSTTOS
:
754 if (rt
->rt_gateway
!= old_gw
)
757 in_dev
= __in_dev_get_rcu(dev
);
762 if (new_gw
== old_gw
|| !IN_DEV_RX_REDIRECTS(in_dev
) ||
763 ipv4_is_multicast(new_gw
) || ipv4_is_lbcast(new_gw
) ||
764 ipv4_is_zeronet(new_gw
))
765 goto reject_redirect
;
767 if (!IN_DEV_SHARED_MEDIA(in_dev
)) {
768 if (!inet_addr_onlink(in_dev
, new_gw
, old_gw
))
769 goto reject_redirect
;
770 if (IN_DEV_SEC_REDIRECTS(in_dev
) && ip_fib_check_default(new_gw
, dev
))
771 goto reject_redirect
;
773 if (inet_addr_type(net
, new_gw
) != RTN_UNICAST
)
774 goto reject_redirect
;
777 n
= __ipv4_neigh_lookup(rt
->dst
.dev
, new_gw
);
779 n
= neigh_create(&arp_tbl
, &new_gw
, rt
->dst
.dev
);
781 if (!(n
->nud_state
& NUD_VALID
)) {
782 neigh_event_send(n
, NULL
);
784 if (fib_lookup(net
, fl4
, &res
, 0) == 0) {
785 struct fib_nh
*nh
= &FIB_RES_NH(res
);
787 update_or_create_fnhe(nh
, fl4
->daddr
, new_gw
,
788 0, jiffies
+ ip_rt_gc_timeout
);
791 rt
->dst
.obsolete
= DST_OBSOLETE_KILL
;
792 call_netevent_notifiers(NETEVENT_NEIGH_UPDATE
, n
);
799 #ifdef CONFIG_IP_ROUTE_VERBOSE
800 if (IN_DEV_LOG_MARTIANS(in_dev
)) {
801 const struct iphdr
*iph
= (const struct iphdr
*) skb
->data
;
802 __be32 daddr
= iph
->daddr
;
803 __be32 saddr
= iph
->saddr
;
805 net_info_ratelimited("Redirect from %pI4 on %s about %pI4 ignored\n"
806 " Advised path = %pI4 -> %pI4\n",
807 &old_gw
, dev
->name
, &new_gw
,
814 static void ip_do_redirect(struct dst_entry
*dst
, struct sock
*sk
, struct sk_buff
*skb
)
818 const struct iphdr
*iph
= (const struct iphdr
*) skb
->data
;
819 struct net
*net
= dev_net(skb
->dev
);
820 int oif
= skb
->dev
->ifindex
;
821 u8 tos
= RT_TOS(iph
->tos
);
822 u8 prot
= iph
->protocol
;
823 u32 mark
= skb
->mark
;
825 rt
= (struct rtable
*) dst
;
827 __build_flow_key(net
, &fl4
, sk
, iph
, oif
, tos
, prot
, mark
, 0);
828 __ip_do_redirect(rt
, skb
, &fl4
, true);
831 static struct dst_entry
*ipv4_negative_advice(struct dst_entry
*dst
)
833 struct rtable
*rt
= (struct rtable
*)dst
;
834 struct dst_entry
*ret
= dst
;
837 if (dst
->obsolete
> 0) {
840 } else if ((rt
->rt_flags
& RTCF_REDIRECTED
) ||
851 * 1. The first ip_rt_redirect_number redirects are sent
852 * with exponential backoff, then we stop sending them at all,
853 * assuming that the host ignores our redirects.
854 * 2. If we did not see packets requiring redirects
855 * during ip_rt_redirect_silence, we assume that the host
856 * forgot redirected route and start to send redirects again.
858 * This algorithm is much cheaper and more intelligent than dumb load limiting
861 * NOTE. Do not forget to inhibit load limiting for redirects (redundant)
862 * and "frag. need" (breaks PMTU discovery) in icmp.c.
865 void ip_rt_send_redirect(struct sk_buff
*skb
)
867 struct rtable
*rt
= skb_rtable(skb
);
868 struct in_device
*in_dev
;
869 struct inet_peer
*peer
;
875 in_dev
= __in_dev_get_rcu(rt
->dst
.dev
);
876 if (!in_dev
|| !IN_DEV_TX_REDIRECTS(in_dev
)) {
880 log_martians
= IN_DEV_LOG_MARTIANS(in_dev
);
881 vif
= l3mdev_master_ifindex_rcu(rt
->dst
.dev
);
884 net
= dev_net(rt
->dst
.dev
);
885 peer
= inet_getpeer_v4(net
->ipv4
.peers
, ip_hdr(skb
)->saddr
, vif
, 1);
887 icmp_send(skb
, ICMP_REDIRECT
, ICMP_REDIR_HOST
,
888 rt_nexthop(rt
, ip_hdr(skb
)->daddr
));
892 /* No redirected packets during ip_rt_redirect_silence;
893 * reset the algorithm.
895 if (time_after(jiffies
, peer
->rate_last
+ ip_rt_redirect_silence
))
896 peer
->rate_tokens
= 0;
898 /* Too many ignored redirects; do not send anything
899 * set dst.rate_last to the last seen redirected packet.
901 if (peer
->rate_tokens
>= ip_rt_redirect_number
) {
902 peer
->rate_last
= jiffies
;
906 /* Check for load limit; set rate_last to the latest sent
909 if (peer
->rate_tokens
== 0 ||
912 (ip_rt_redirect_load
<< peer
->rate_tokens
)))) {
913 __be32 gw
= rt_nexthop(rt
, ip_hdr(skb
)->daddr
);
915 icmp_send(skb
, ICMP_REDIRECT
, ICMP_REDIR_HOST
, gw
);
916 peer
->rate_last
= jiffies
;
918 #ifdef CONFIG_IP_ROUTE_VERBOSE
920 peer
->rate_tokens
== ip_rt_redirect_number
)
921 net_warn_ratelimited("host %pI4/if%d ignores redirects for %pI4 to %pI4\n",
922 &ip_hdr(skb
)->saddr
, inet_iif(skb
),
923 &ip_hdr(skb
)->daddr
, &gw
);
930 static int ip_error(struct sk_buff
*skb
)
932 struct in_device
*in_dev
= __in_dev_get_rcu(skb
->dev
);
933 struct rtable
*rt
= skb_rtable(skb
);
934 struct inet_peer
*peer
;
940 /* IP on this device is disabled. */
944 net
= dev_net(rt
->dst
.dev
);
945 if (!IN_DEV_FORWARD(in_dev
)) {
946 switch (rt
->dst
.error
) {
948 __IP_INC_STATS(net
, IPSTATS_MIB_INADDRERRORS
);
952 __IP_INC_STATS(net
, IPSTATS_MIB_INNOROUTES
);
958 switch (rt
->dst
.error
) {
963 code
= ICMP_HOST_UNREACH
;
966 code
= ICMP_NET_UNREACH
;
967 __IP_INC_STATS(net
, IPSTATS_MIB_INNOROUTES
);
970 code
= ICMP_PKT_FILTERED
;
974 peer
= inet_getpeer_v4(net
->ipv4
.peers
, ip_hdr(skb
)->saddr
,
975 l3mdev_master_ifindex(skb
->dev
), 1);
980 peer
->rate_tokens
+= now
- peer
->rate_last
;
981 if (peer
->rate_tokens
> ip_rt_error_burst
)
982 peer
->rate_tokens
= ip_rt_error_burst
;
983 peer
->rate_last
= now
;
984 if (peer
->rate_tokens
>= ip_rt_error_cost
)
985 peer
->rate_tokens
-= ip_rt_error_cost
;
991 icmp_send(skb
, ICMP_DEST_UNREACH
, code
, 0);
997 static void __ip_rt_update_pmtu(struct rtable
*rt
, struct flowi4
*fl4
, u32 mtu
)
999 struct dst_entry
*dst
= &rt
->dst
;
1000 struct fib_result res
;
1002 if (dst_metric_locked(dst
, RTAX_MTU
))
1005 if (ipv4_mtu(dst
) < mtu
)
1008 if (mtu
< ip_rt_min_pmtu
)
1009 mtu
= ip_rt_min_pmtu
;
1011 if (rt
->rt_pmtu
== mtu
&&
1012 time_before(jiffies
, dst
->expires
- ip_rt_mtu_expires
/ 2))
1016 if (fib_lookup(dev_net(dst
->dev
), fl4
, &res
, 0) == 0) {
1017 struct fib_nh
*nh
= &FIB_RES_NH(res
);
1019 update_or_create_fnhe(nh
, fl4
->daddr
, 0, mtu
,
1020 jiffies
+ ip_rt_mtu_expires
);
1025 static void ip_rt_update_pmtu(struct dst_entry
*dst
, struct sock
*sk
,
1026 struct sk_buff
*skb
, u32 mtu
)
1028 struct rtable
*rt
= (struct rtable
*) dst
;
1031 ip_rt_build_flow_key(&fl4
, sk
, skb
);
1032 __ip_rt_update_pmtu(rt
, &fl4
, mtu
);
1035 void ipv4_update_pmtu(struct sk_buff
*skb
, struct net
*net
, u32 mtu
,
1036 int oif
, u32 mark
, u8 protocol
, int flow_flags
)
1038 const struct iphdr
*iph
= (const struct iphdr
*) skb
->data
;
1043 mark
= IP4_REPLY_MARK(net
, skb
->mark
);
1045 __build_flow_key(net
, &fl4
, NULL
, iph
, oif
,
1046 RT_TOS(iph
->tos
), protocol
, mark
, flow_flags
);
1047 rt
= __ip_route_output_key(net
, &fl4
);
1049 __ip_rt_update_pmtu(rt
, &fl4
, mtu
);
1053 EXPORT_SYMBOL_GPL(ipv4_update_pmtu
);
1055 static void __ipv4_sk_update_pmtu(struct sk_buff
*skb
, struct sock
*sk
, u32 mtu
)
1057 const struct iphdr
*iph
= (const struct iphdr
*) skb
->data
;
1061 __build_flow_key(sock_net(sk
), &fl4
, sk
, iph
, 0, 0, 0, 0, 0);
1063 if (!fl4
.flowi4_mark
)
1064 fl4
.flowi4_mark
= IP4_REPLY_MARK(sock_net(sk
), skb
->mark
);
1066 rt
= __ip_route_output_key(sock_net(sk
), &fl4
);
1068 __ip_rt_update_pmtu(rt
, &fl4
, mtu
);
1073 void ipv4_sk_update_pmtu(struct sk_buff
*skb
, struct sock
*sk
, u32 mtu
)
1075 const struct iphdr
*iph
= (const struct iphdr
*) skb
->data
;
1078 struct dst_entry
*odst
= NULL
;
1080 struct net
*net
= sock_net(sk
);
1084 if (!ip_sk_accept_pmtu(sk
))
1087 odst
= sk_dst_get(sk
);
1089 if (sock_owned_by_user(sk
) || !odst
) {
1090 __ipv4_sk_update_pmtu(skb
, sk
, mtu
);
1094 __build_flow_key(net
, &fl4
, sk
, iph
, 0, 0, 0, 0, 0);
1096 rt
= (struct rtable
*)odst
;
1097 if (odst
->obsolete
&& !odst
->ops
->check(odst
, 0)) {
1098 rt
= ip_route_output_flow(sock_net(sk
), &fl4
, sk
);
1105 __ip_rt_update_pmtu((struct rtable
*) rt
->dst
.path
, &fl4
, mtu
);
1107 if (!dst_check(&rt
->dst
, 0)) {
1109 dst_release(&rt
->dst
);
1111 rt
= ip_route_output_flow(sock_net(sk
), &fl4
, sk
);
1119 sk_dst_set(sk
, &rt
->dst
);
1125 EXPORT_SYMBOL_GPL(ipv4_sk_update_pmtu
);
1127 void ipv4_redirect(struct sk_buff
*skb
, struct net
*net
,
1128 int oif
, u32 mark
, u8 protocol
, int flow_flags
)
1130 const struct iphdr
*iph
= (const struct iphdr
*) skb
->data
;
1134 __build_flow_key(net
, &fl4
, NULL
, iph
, oif
,
1135 RT_TOS(iph
->tos
), protocol
, mark
, flow_flags
);
1136 rt
= __ip_route_output_key(net
, &fl4
);
1138 __ip_do_redirect(rt
, skb
, &fl4
, false);
1142 EXPORT_SYMBOL_GPL(ipv4_redirect
);
1144 void ipv4_sk_redirect(struct sk_buff
*skb
, struct sock
*sk
)
1146 const struct iphdr
*iph
= (const struct iphdr
*) skb
->data
;
1149 struct net
*net
= sock_net(sk
);
1151 __build_flow_key(net
, &fl4
, sk
, iph
, 0, 0, 0, 0, 0);
1152 rt
= __ip_route_output_key(net
, &fl4
);
1154 __ip_do_redirect(rt
, skb
, &fl4
, false);
1158 EXPORT_SYMBOL_GPL(ipv4_sk_redirect
);
1160 static struct dst_entry
*ipv4_dst_check(struct dst_entry
*dst
, u32 cookie
)
1162 struct rtable
*rt
= (struct rtable
*) dst
;
1164 /* All IPV4 dsts are created with ->obsolete set to the value
1165 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1166 * into this function always.
1168 * When a PMTU/redirect information update invalidates a route,
1169 * this is indicated by setting obsolete to DST_OBSOLETE_KILL or
1170 * DST_OBSOLETE_DEAD by dst_free().
1172 if (dst
->obsolete
!= DST_OBSOLETE_FORCE_CHK
|| rt_is_expired(rt
))
1177 static void ipv4_link_failure(struct sk_buff
*skb
)
1181 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_HOST_UNREACH
, 0);
1183 rt
= skb_rtable(skb
);
1185 dst_set_expires(&rt
->dst
, 0);
1188 static int ip_rt_bug(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
1190 pr_debug("%s: %pI4 -> %pI4, %s\n",
1191 __func__
, &ip_hdr(skb
)->saddr
, &ip_hdr(skb
)->daddr
,
1192 skb
->dev
? skb
->dev
->name
: "?");
1199 We do not cache source address of outgoing interface,
1200 because it is used only by IP RR, TS and SRR options,
1201 so that it out of fast path.
1203 BTW remember: "addr" is allowed to be not aligned
1207 void ip_rt_get_source(u8
*addr
, struct sk_buff
*skb
, struct rtable
*rt
)
1211 if (rt_is_output_route(rt
))
1212 src
= ip_hdr(skb
)->saddr
;
1214 struct fib_result res
;
1220 memset(&fl4
, 0, sizeof(fl4
));
1221 fl4
.daddr
= iph
->daddr
;
1222 fl4
.saddr
= iph
->saddr
;
1223 fl4
.flowi4_tos
= RT_TOS(iph
->tos
);
1224 fl4
.flowi4_oif
= rt
->dst
.dev
->ifindex
;
1225 fl4
.flowi4_iif
= skb
->dev
->ifindex
;
1226 fl4
.flowi4_mark
= skb
->mark
;
1229 if (fib_lookup(dev_net(rt
->dst
.dev
), &fl4
, &res
, 0) == 0)
1230 src
= FIB_RES_PREFSRC(dev_net(rt
->dst
.dev
), res
);
1232 src
= inet_select_addr(rt
->dst
.dev
,
1233 rt_nexthop(rt
, iph
->daddr
),
1237 memcpy(addr
, &src
, 4);
1240 #ifdef CONFIG_IP_ROUTE_CLASSID
1241 static void set_class_tag(struct rtable
*rt
, u32 tag
)
1243 if (!(rt
->dst
.tclassid
& 0xFFFF))
1244 rt
->dst
.tclassid
|= tag
& 0xFFFF;
1245 if (!(rt
->dst
.tclassid
& 0xFFFF0000))
1246 rt
->dst
.tclassid
|= tag
& 0xFFFF0000;
1250 static unsigned int ipv4_default_advmss(const struct dst_entry
*dst
)
1252 unsigned int header_size
= sizeof(struct tcphdr
) + sizeof(struct iphdr
);
1253 unsigned int advmss
= max_t(unsigned int, dst
->dev
->mtu
- header_size
,
1256 return min(advmss
, IPV4_MAX_PMTU
- header_size
);
1259 static unsigned int ipv4_mtu(const struct dst_entry
*dst
)
1261 const struct rtable
*rt
= (const struct rtable
*) dst
;
1262 unsigned int mtu
= rt
->rt_pmtu
;
1264 if (!mtu
|| time_after_eq(jiffies
, rt
->dst
.expires
))
1265 mtu
= dst_metric_raw(dst
, RTAX_MTU
);
1270 mtu
= READ_ONCE(dst
->dev
->mtu
);
1272 if (unlikely(dst_metric_locked(dst
, RTAX_MTU
))) {
1273 if (rt
->rt_uses_gateway
&& mtu
> 576)
1277 mtu
= min_t(unsigned int, mtu
, IP_MAX_MTU
);
1279 return mtu
- lwtunnel_headroom(dst
->lwtstate
, mtu
);
1282 static struct fib_nh_exception
*find_exception(struct fib_nh
*nh
, __be32 daddr
)
1284 struct fnhe_hash_bucket
*hash
= rcu_dereference(nh
->nh_exceptions
);
1285 struct fib_nh_exception
*fnhe
;
1291 hval
= fnhe_hashfun(daddr
);
1293 for (fnhe
= rcu_dereference(hash
[hval
].chain
); fnhe
;
1294 fnhe
= rcu_dereference(fnhe
->fnhe_next
)) {
1295 if (fnhe
->fnhe_daddr
== daddr
)
1301 static bool rt_bind_exception(struct rtable
*rt
, struct fib_nh_exception
*fnhe
,
1302 __be32 daddr
, const bool do_cache
)
1306 spin_lock_bh(&fnhe_lock
);
1308 if (daddr
== fnhe
->fnhe_daddr
) {
1309 struct rtable __rcu
**porig
;
1310 struct rtable
*orig
;
1311 int genid
= fnhe_genid(dev_net(rt
->dst
.dev
));
1313 if (rt_is_input_route(rt
))
1314 porig
= &fnhe
->fnhe_rth_input
;
1316 porig
= &fnhe
->fnhe_rth_output
;
1317 orig
= rcu_dereference(*porig
);
1319 if (fnhe
->fnhe_genid
!= genid
) {
1320 fnhe
->fnhe_genid
= genid
;
1322 fnhe
->fnhe_pmtu
= 0;
1323 fnhe
->fnhe_expires
= 0;
1324 fnhe_flush_routes(fnhe
);
1327 fill_route_from_fnhe(rt
, fnhe
);
1328 if (!rt
->rt_gateway
)
1329 rt
->rt_gateway
= daddr
;
1333 rcu_assign_pointer(*porig
, rt
);
1335 dst_dev_put(&orig
->dst
);
1336 dst_release(&orig
->dst
);
1341 fnhe
->fnhe_stamp
= jiffies
;
1343 spin_unlock_bh(&fnhe_lock
);
1348 static bool rt_cache_route(struct fib_nh
*nh
, struct rtable
*rt
)
1350 struct rtable
*orig
, *prev
, **p
;
1353 if (rt_is_input_route(rt
)) {
1354 p
= (struct rtable
**)&nh
->nh_rth_input
;
1356 p
= (struct rtable
**)raw_cpu_ptr(nh
->nh_pcpu_rth_output
);
1360 /* hold dst before doing cmpxchg() to avoid race condition
1364 prev
= cmpxchg(p
, orig
, rt
);
1367 dst_dev_put(&orig
->dst
);
1368 dst_release(&orig
->dst
);
1371 dst_release(&rt
->dst
);
1378 struct uncached_list
{
1380 struct list_head head
;
1383 static DEFINE_PER_CPU_ALIGNED(struct uncached_list
, rt_uncached_list
);
1385 void rt_add_uncached_list(struct rtable
*rt
)
1387 struct uncached_list
*ul
= raw_cpu_ptr(&rt_uncached_list
);
1389 rt
->rt_uncached_list
= ul
;
1391 spin_lock_bh(&ul
->lock
);
1392 list_add_tail(&rt
->rt_uncached
, &ul
->head
);
1393 spin_unlock_bh(&ul
->lock
);
1396 void rt_del_uncached_list(struct rtable
*rt
)
1398 if (!list_empty(&rt
->rt_uncached
)) {
1399 struct uncached_list
*ul
= rt
->rt_uncached_list
;
1401 spin_lock_bh(&ul
->lock
);
1402 list_del(&rt
->rt_uncached
);
1403 spin_unlock_bh(&ul
->lock
);
1407 static void ipv4_dst_destroy(struct dst_entry
*dst
)
1409 struct dst_metrics
*p
= (struct dst_metrics
*)DST_METRICS_PTR(dst
);
1410 struct rtable
*rt
= (struct rtable
*)dst
;
1412 if (p
!= &dst_default_metrics
&& refcount_dec_and_test(&p
->refcnt
))
1415 rt_del_uncached_list(rt
);
1418 void rt_flush_dev(struct net_device
*dev
)
1420 struct net
*net
= dev_net(dev
);
1424 for_each_possible_cpu(cpu
) {
1425 struct uncached_list
*ul
= &per_cpu(rt_uncached_list
, cpu
);
1427 spin_lock_bh(&ul
->lock
);
1428 list_for_each_entry(rt
, &ul
->head
, rt_uncached
) {
1429 if (rt
->dst
.dev
!= dev
)
1431 rt
->dst
.dev
= net
->loopback_dev
;
1432 dev_hold(rt
->dst
.dev
);
1435 spin_unlock_bh(&ul
->lock
);
1439 static bool rt_cache_valid(const struct rtable
*rt
)
1442 rt
->dst
.obsolete
== DST_OBSOLETE_FORCE_CHK
&&
1446 static void rt_set_nexthop(struct rtable
*rt
, __be32 daddr
,
1447 const struct fib_result
*res
,
1448 struct fib_nh_exception
*fnhe
,
1449 struct fib_info
*fi
, u16 type
, u32 itag
,
1450 const bool do_cache
)
1452 bool cached
= false;
1455 struct fib_nh
*nh
= &FIB_RES_NH(*res
);
1457 if (nh
->nh_gw
&& nh
->nh_scope
== RT_SCOPE_LINK
) {
1458 rt
->rt_gateway
= nh
->nh_gw
;
1459 rt
->rt_uses_gateway
= 1;
1461 dst_init_metrics(&rt
->dst
, fi
->fib_metrics
->metrics
, true);
1462 if (fi
->fib_metrics
!= &dst_default_metrics
) {
1463 rt
->dst
._metrics
|= DST_METRICS_REFCOUNTED
;
1464 refcount_inc(&fi
->fib_metrics
->refcnt
);
1466 #ifdef CONFIG_IP_ROUTE_CLASSID
1467 rt
->dst
.tclassid
= nh
->nh_tclassid
;
1469 rt
->dst
.lwtstate
= lwtstate_get(nh
->nh_lwtstate
);
1471 cached
= rt_bind_exception(rt
, fnhe
, daddr
, do_cache
);
1473 cached
= rt_cache_route(nh
, rt
);
1474 if (unlikely(!cached
)) {
1475 /* Routes we intend to cache in nexthop exception or
1476 * FIB nexthop have the DST_NOCACHE bit clear.
1477 * However, if we are unsuccessful at storing this
1478 * route into the cache we really need to set it.
1480 if (!rt
->rt_gateway
)
1481 rt
->rt_gateway
= daddr
;
1482 rt_add_uncached_list(rt
);
1485 rt_add_uncached_list(rt
);
1487 #ifdef CONFIG_IP_ROUTE_CLASSID
1488 #ifdef CONFIG_IP_MULTIPLE_TABLES
1489 set_class_tag(rt
, res
->tclassid
);
1491 set_class_tag(rt
, itag
);
1495 struct rtable
*rt_dst_alloc(struct net_device
*dev
,
1496 unsigned int flags
, u16 type
,
1497 bool nopolicy
, bool noxfrm
, bool will_cache
)
1501 rt
= dst_alloc(&ipv4_dst_ops
, dev
, 1, DST_OBSOLETE_FORCE_CHK
,
1502 (will_cache
? 0 : DST_HOST
) |
1503 (nopolicy
? DST_NOPOLICY
: 0) |
1504 (noxfrm
? DST_NOXFRM
: 0));
1507 rt
->rt_genid
= rt_genid_ipv4(dev_net(dev
));
1508 rt
->rt_flags
= flags
;
1510 rt
->rt_is_input
= 0;
1514 rt
->rt_uses_gateway
= 0;
1515 rt
->rt_table_id
= 0;
1516 INIT_LIST_HEAD(&rt
->rt_uncached
);
1518 rt
->dst
.output
= ip_output
;
1519 if (flags
& RTCF_LOCAL
)
1520 rt
->dst
.input
= ip_local_deliver
;
1525 EXPORT_SYMBOL(rt_dst_alloc
);
1527 /* called in rcu_read_lock() section */
1528 int ip_mc_validate_source(struct sk_buff
*skb
, __be32 daddr
, __be32 saddr
,
1529 u8 tos
, struct net_device
*dev
,
1530 struct in_device
*in_dev
, u32
*itag
)
1534 /* Primary sanity checks. */
1538 if (ipv4_is_multicast(saddr
) || ipv4_is_lbcast(saddr
) ||
1539 skb
->protocol
!= htons(ETH_P_IP
))
1542 if (ipv4_is_loopback(saddr
) && !IN_DEV_ROUTE_LOCALNET(in_dev
))
1545 if (ipv4_is_zeronet(saddr
)) {
1546 if (!ipv4_is_local_multicast(daddr
))
1549 err
= fib_validate_source(skb
, saddr
, 0, tos
, 0, dev
,
1557 /* called in rcu_read_lock() section */
1558 static int ip_route_input_mc(struct sk_buff
*skb
, __be32 daddr
, __be32 saddr
,
1559 u8 tos
, struct net_device
*dev
, int our
)
1561 struct in_device
*in_dev
= __in_dev_get_rcu(dev
);
1562 unsigned int flags
= RTCF_MULTICAST
;
1567 err
= ip_mc_validate_source(skb
, daddr
, saddr
, tos
, dev
, in_dev
, &itag
);
1572 flags
|= RTCF_LOCAL
;
1574 rth
= rt_dst_alloc(dev_net(dev
)->loopback_dev
, flags
, RTN_MULTICAST
,
1575 IN_DEV_CONF_GET(in_dev
, NOPOLICY
), false, false);
1579 #ifdef CONFIG_IP_ROUTE_CLASSID
1580 rth
->dst
.tclassid
= itag
;
1582 rth
->dst
.output
= ip_rt_bug
;
1583 rth
->rt_is_input
= 1;
1585 #ifdef CONFIG_IP_MROUTE
1586 if (!ipv4_is_local_multicast(daddr
) && IN_DEV_MFORWARD(in_dev
))
1587 rth
->dst
.input
= ip_mr_input
;
1589 RT_CACHE_STAT_INC(in_slow_mc
);
1591 skb_dst_set(skb
, &rth
->dst
);
1596 static void ip_handle_martian_source(struct net_device
*dev
,
1597 struct in_device
*in_dev
,
1598 struct sk_buff
*skb
,
1602 RT_CACHE_STAT_INC(in_martian_src
);
1603 #ifdef CONFIG_IP_ROUTE_VERBOSE
1604 if (IN_DEV_LOG_MARTIANS(in_dev
) && net_ratelimit()) {
1606 * RFC1812 recommendation, if source is martian,
1607 * the only hint is MAC header.
1609 pr_warn("martian source %pI4 from %pI4, on dev %s\n",
1610 &daddr
, &saddr
, dev
->name
);
1611 if (dev
->hard_header_len
&& skb_mac_header_was_set(skb
)) {
1612 print_hex_dump(KERN_WARNING
, "ll header: ",
1613 DUMP_PREFIX_OFFSET
, 16, 1,
1614 skb_mac_header(skb
),
1615 dev
->hard_header_len
, true);
1621 static void ip_del_fnhe(struct fib_nh
*nh
, __be32 daddr
)
1623 struct fnhe_hash_bucket
*hash
;
1624 struct fib_nh_exception
*fnhe
, __rcu
**fnhe_p
;
1625 u32 hval
= fnhe_hashfun(daddr
);
1627 spin_lock_bh(&fnhe_lock
);
1629 hash
= rcu_dereference_protected(nh
->nh_exceptions
,
1630 lockdep_is_held(&fnhe_lock
));
1633 fnhe_p
= &hash
->chain
;
1634 fnhe
= rcu_dereference_protected(*fnhe_p
, lockdep_is_held(&fnhe_lock
));
1636 if (fnhe
->fnhe_daddr
== daddr
) {
1637 rcu_assign_pointer(*fnhe_p
, rcu_dereference_protected(
1638 fnhe
->fnhe_next
, lockdep_is_held(&fnhe_lock
)));
1639 fnhe_flush_routes(fnhe
);
1640 kfree_rcu(fnhe
, rcu
);
1643 fnhe_p
= &fnhe
->fnhe_next
;
1644 fnhe
= rcu_dereference_protected(fnhe
->fnhe_next
,
1645 lockdep_is_held(&fnhe_lock
));
1648 spin_unlock_bh(&fnhe_lock
);
1651 static void set_lwt_redirect(struct rtable
*rth
)
1653 if (lwtunnel_output_redirect(rth
->dst
.lwtstate
)) {
1654 rth
->dst
.lwtstate
->orig_output
= rth
->dst
.output
;
1655 rth
->dst
.output
= lwtunnel_output
;
1658 if (lwtunnel_input_redirect(rth
->dst
.lwtstate
)) {
1659 rth
->dst
.lwtstate
->orig_input
= rth
->dst
.input
;
1660 rth
->dst
.input
= lwtunnel_input
;
1664 /* called in rcu_read_lock() section */
1665 static int __mkroute_input(struct sk_buff
*skb
,
1666 const struct fib_result
*res
,
1667 struct in_device
*in_dev
,
1668 __be32 daddr
, __be32 saddr
, u32 tos
)
1670 struct fib_nh_exception
*fnhe
;
1673 struct in_device
*out_dev
;
1677 /* get a working reference to the output device */
1678 out_dev
= __in_dev_get_rcu(FIB_RES_DEV(*res
));
1680 net_crit_ratelimited("Bug in ip_route_input_slow(). Please report.\n");
1684 err
= fib_validate_source(skb
, saddr
, daddr
, tos
, FIB_RES_OIF(*res
),
1685 in_dev
->dev
, in_dev
, &itag
);
1687 ip_handle_martian_source(in_dev
->dev
, in_dev
, skb
, daddr
,
1693 do_cache
= res
->fi
&& !itag
;
1694 if (out_dev
== in_dev
&& err
&& IN_DEV_TX_REDIRECTS(out_dev
) &&
1695 skb
->protocol
== htons(ETH_P_IP
) &&
1696 (IN_DEV_SHARED_MEDIA(out_dev
) ||
1697 inet_addr_onlink(out_dev
, saddr
, FIB_RES_GW(*res
))))
1698 IPCB(skb
)->flags
|= IPSKB_DOREDIRECT
;
1700 if (skb
->protocol
!= htons(ETH_P_IP
)) {
1701 /* Not IP (i.e. ARP). Do not create route, if it is
1702 * invalid for proxy arp. DNAT routes are always valid.
1704 * Proxy arp feature have been extended to allow, ARP
1705 * replies back to the same interface, to support
1706 * Private VLAN switch technologies. See arp.c.
1708 if (out_dev
== in_dev
&&
1709 IN_DEV_PROXY_ARP_PVLAN(in_dev
) == 0) {
1715 fnhe
= find_exception(&FIB_RES_NH(*res
), daddr
);
1718 rth
= rcu_dereference(fnhe
->fnhe_rth_input
);
1719 if (rth
&& rth
->dst
.expires
&&
1720 time_after(jiffies
, rth
->dst
.expires
)) {
1721 ip_del_fnhe(&FIB_RES_NH(*res
), daddr
);
1728 rth
= rcu_dereference(FIB_RES_NH(*res
).nh_rth_input
);
1731 if (rt_cache_valid(rth
)) {
1732 skb_dst_set_noref(skb
, &rth
->dst
);
1737 rth
= rt_dst_alloc(out_dev
->dev
, 0, res
->type
,
1738 IN_DEV_CONF_GET(in_dev
, NOPOLICY
),
1739 IN_DEV_CONF_GET(out_dev
, NOXFRM
), do_cache
);
1745 rth
->rt_is_input
= 1;
1747 rth
->rt_table_id
= res
->table
->tb_id
;
1748 RT_CACHE_STAT_INC(in_slow_tot
);
1750 rth
->dst
.input
= ip_forward
;
1752 rt_set_nexthop(rth
, daddr
, res
, fnhe
, res
->fi
, res
->type
, itag
,
1754 set_lwt_redirect(rth
);
1755 skb_dst_set(skb
, &rth
->dst
);
1762 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1763 /* To make ICMP packets follow the right flow, the multipath hash is
1764 * calculated from the inner IP addresses.
1766 static void ip_multipath_l3_keys(const struct sk_buff
*skb
,
1767 struct flow_keys
*hash_keys
)
1769 const struct iphdr
*outer_iph
= ip_hdr(skb
);
1770 const struct iphdr
*inner_iph
;
1771 const struct icmphdr
*icmph
;
1772 struct iphdr _inner_iph
;
1773 struct icmphdr _icmph
;
1775 hash_keys
->addrs
.v4addrs
.src
= outer_iph
->saddr
;
1776 hash_keys
->addrs
.v4addrs
.dst
= outer_iph
->daddr
;
1777 if (likely(outer_iph
->protocol
!= IPPROTO_ICMP
))
1780 if (unlikely((outer_iph
->frag_off
& htons(IP_OFFSET
)) != 0))
1783 icmph
= skb_header_pointer(skb
, outer_iph
->ihl
* 4, sizeof(_icmph
),
1788 if (icmph
->type
!= ICMP_DEST_UNREACH
&&
1789 icmph
->type
!= ICMP_REDIRECT
&&
1790 icmph
->type
!= ICMP_TIME_EXCEEDED
&&
1791 icmph
->type
!= ICMP_PARAMETERPROB
)
1794 inner_iph
= skb_header_pointer(skb
,
1795 outer_iph
->ihl
* 4 + sizeof(_icmph
),
1796 sizeof(_inner_iph
), &_inner_iph
);
1799 hash_keys
->addrs
.v4addrs
.src
= inner_iph
->saddr
;
1800 hash_keys
->addrs
.v4addrs
.dst
= inner_iph
->daddr
;
1803 /* if skb is set it will be used and fl4 can be NULL */
1804 int fib_multipath_hash(const struct fib_info
*fi
, const struct flowi4
*fl4
,
1805 const struct sk_buff
*skb
)
1807 struct net
*net
= fi
->fib_net
;
1808 struct flow_keys hash_keys
;
1811 switch (net
->ipv4
.sysctl_fib_multipath_hash_policy
) {
1813 memset(&hash_keys
, 0, sizeof(hash_keys
));
1814 hash_keys
.control
.addr_type
= FLOW_DISSECTOR_KEY_IPV4_ADDRS
;
1816 ip_multipath_l3_keys(skb
, &hash_keys
);
1818 hash_keys
.addrs
.v4addrs
.src
= fl4
->saddr
;
1819 hash_keys
.addrs
.v4addrs
.dst
= fl4
->daddr
;
1823 /* skb is currently provided only when forwarding */
1825 unsigned int flag
= FLOW_DISSECTOR_F_STOP_AT_ENCAP
;
1826 struct flow_keys keys
;
1828 /* short-circuit if we already have L4 hash present */
1830 return skb_get_hash_raw(skb
) >> 1;
1831 memset(&hash_keys
, 0, sizeof(hash_keys
));
1832 skb_flow_dissect_flow_keys(skb
, &keys
, flag
);
1833 hash_keys
.addrs
.v4addrs
.src
= keys
.addrs
.v4addrs
.src
;
1834 hash_keys
.addrs
.v4addrs
.dst
= keys
.addrs
.v4addrs
.dst
;
1835 hash_keys
.ports
.src
= keys
.ports
.src
;
1836 hash_keys
.ports
.dst
= keys
.ports
.dst
;
1837 hash_keys
.basic
.ip_proto
= keys
.basic
.ip_proto
;
1839 memset(&hash_keys
, 0, sizeof(hash_keys
));
1840 hash_keys
.control
.addr_type
= FLOW_DISSECTOR_KEY_IPV4_ADDRS
;
1841 hash_keys
.addrs
.v4addrs
.src
= fl4
->saddr
;
1842 hash_keys
.addrs
.v4addrs
.dst
= fl4
->daddr
;
1843 hash_keys
.ports
.src
= fl4
->fl4_sport
;
1844 hash_keys
.ports
.dst
= fl4
->fl4_dport
;
1845 hash_keys
.basic
.ip_proto
= fl4
->flowi4_proto
;
1849 mhash
= flow_hash_from_keys(&hash_keys
);
1853 EXPORT_SYMBOL_GPL(fib_multipath_hash
);
1854 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
1856 static int ip_mkroute_input(struct sk_buff
*skb
,
1857 struct fib_result
*res
,
1858 struct in_device
*in_dev
,
1859 __be32 daddr
, __be32 saddr
, u32 tos
)
1861 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1862 if (res
->fi
&& res
->fi
->fib_nhs
> 1) {
1863 int h
= fib_multipath_hash(res
->fi
, NULL
, skb
);
1865 fib_select_multipath(res
, h
);
1869 /* create a routing cache entry */
1870 return __mkroute_input(skb
, res
, in_dev
, daddr
, saddr
, tos
);
1874 * NOTE. We drop all the packets that has local source
1875 * addresses, because every properly looped back packet
1876 * must have correct destination already attached by output routine.
1878 * Such approach solves two big problems:
1879 * 1. Not simplex devices are handled properly.
1880 * 2. IP spoofing attempts are filtered with 100% of guarantee.
1881 * called with rcu_read_lock()
1884 static int ip_route_input_slow(struct sk_buff
*skb
, __be32 daddr
, __be32 saddr
,
1885 u8 tos
, struct net_device
*dev
,
1886 struct fib_result
*res
)
1888 struct in_device
*in_dev
= __in_dev_get_rcu(dev
);
1889 struct ip_tunnel_info
*tun_info
;
1891 unsigned int flags
= 0;
1895 struct net
*net
= dev_net(dev
);
1898 /* IP on this device is disabled. */
1903 /* Check for the most weird martians, which can be not detected
1907 tun_info
= skb_tunnel_info(skb
);
1908 if (tun_info
&& !(tun_info
->mode
& IP_TUNNEL_INFO_TX
))
1909 fl4
.flowi4_tun_key
.tun_id
= tun_info
->key
.tun_id
;
1911 fl4
.flowi4_tun_key
.tun_id
= 0;
1914 if (ipv4_is_multicast(saddr
) || ipv4_is_lbcast(saddr
))
1915 goto martian_source
;
1919 if (ipv4_is_lbcast(daddr
) || (saddr
== 0 && daddr
== 0))
1922 /* Accept zero addresses only to limited broadcast;
1923 * I even do not know to fix it or not. Waiting for complains :-)
1925 if (ipv4_is_zeronet(saddr
))
1926 goto martian_source
;
1928 if (ipv4_is_zeronet(daddr
))
1929 goto martian_destination
;
1931 /* Following code try to avoid calling IN_DEV_NET_ROUTE_LOCALNET(),
1932 * and call it once if daddr or/and saddr are loopback addresses
1934 if (ipv4_is_loopback(daddr
)) {
1935 if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev
, net
))
1936 goto martian_destination
;
1937 } else if (ipv4_is_loopback(saddr
)) {
1938 if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev
, net
))
1939 goto martian_source
;
1943 * Now we are ready to route packet.
1946 fl4
.flowi4_iif
= dev
->ifindex
;
1947 fl4
.flowi4_mark
= skb
->mark
;
1948 fl4
.flowi4_tos
= tos
;
1949 fl4
.flowi4_scope
= RT_SCOPE_UNIVERSE
;
1950 fl4
.flowi4_flags
= 0;
1953 fl4
.flowi4_uid
= sock_net_uid(net
, NULL
);
1954 err
= fib_lookup(net
, &fl4
, res
, 0);
1956 if (!IN_DEV_FORWARD(in_dev
))
1957 err
= -EHOSTUNREACH
;
1961 if (res
->type
== RTN_BROADCAST
)
1964 if (res
->type
== RTN_LOCAL
) {
1965 err
= fib_validate_source(skb
, saddr
, daddr
, tos
,
1966 0, dev
, in_dev
, &itag
);
1968 goto martian_source
;
1972 if (!IN_DEV_FORWARD(in_dev
)) {
1973 err
= -EHOSTUNREACH
;
1976 if (res
->type
!= RTN_UNICAST
)
1977 goto martian_destination
;
1979 err
= ip_mkroute_input(skb
, res
, in_dev
, daddr
, saddr
, tos
);
1983 if (skb
->protocol
!= htons(ETH_P_IP
))
1986 if (!ipv4_is_zeronet(saddr
)) {
1987 err
= fib_validate_source(skb
, saddr
, 0, tos
, 0, dev
,
1990 goto martian_source
;
1992 flags
|= RTCF_BROADCAST
;
1993 res
->type
= RTN_BROADCAST
;
1994 RT_CACHE_STAT_INC(in_brd
);
2000 rth
= rcu_dereference(FIB_RES_NH(*res
).nh_rth_input
);
2001 if (rt_cache_valid(rth
)) {
2002 skb_dst_set_noref(skb
, &rth
->dst
);
2010 rth
= rt_dst_alloc(l3mdev_master_dev_rcu(dev
) ? : net
->loopback_dev
,
2011 flags
| RTCF_LOCAL
, res
->type
,
2012 IN_DEV_CONF_GET(in_dev
, NOPOLICY
), false, do_cache
);
2016 rth
->dst
.output
= ip_rt_bug
;
2017 #ifdef CONFIG_IP_ROUTE_CLASSID
2018 rth
->dst
.tclassid
= itag
;
2020 rth
->rt_is_input
= 1;
2022 rth
->rt_table_id
= res
->table
->tb_id
;
2024 RT_CACHE_STAT_INC(in_slow_tot
);
2025 if (res
->type
== RTN_UNREACHABLE
) {
2026 rth
->dst
.input
= ip_error
;
2027 rth
->dst
.error
= -err
;
2028 rth
->rt_flags
&= ~RTCF_LOCAL
;
2032 struct fib_nh
*nh
= &FIB_RES_NH(*res
);
2034 rth
->dst
.lwtstate
= lwtstate_get(nh
->nh_lwtstate
);
2035 if (lwtunnel_input_redirect(rth
->dst
.lwtstate
)) {
2036 WARN_ON(rth
->dst
.input
== lwtunnel_input
);
2037 rth
->dst
.lwtstate
->orig_input
= rth
->dst
.input
;
2038 rth
->dst
.input
= lwtunnel_input
;
2041 if (unlikely(!rt_cache_route(nh
, rth
)))
2042 rt_add_uncached_list(rth
);
2044 skb_dst_set(skb
, &rth
->dst
);
2049 RT_CACHE_STAT_INC(in_no_route
);
2050 res
->type
= RTN_UNREACHABLE
;
2056 * Do not cache martian addresses: they should be logged (RFC1812)
2058 martian_destination
:
2059 RT_CACHE_STAT_INC(in_martian_dst
);
2060 #ifdef CONFIG_IP_ROUTE_VERBOSE
2061 if (IN_DEV_LOG_MARTIANS(in_dev
))
2062 net_warn_ratelimited("martian destination %pI4 from %pI4, dev %s\n",
2063 &daddr
, &saddr
, dev
->name
);
2075 ip_handle_martian_source(dev
, in_dev
, skb
, daddr
, saddr
);
2079 int ip_route_input_noref(struct sk_buff
*skb
, __be32 daddr
, __be32 saddr
,
2080 u8 tos
, struct net_device
*dev
)
2082 struct fib_result res
;
2085 tos
&= IPTOS_RT_MASK
;
2087 err
= ip_route_input_rcu(skb
, daddr
, saddr
, tos
, dev
, &res
);
2092 EXPORT_SYMBOL(ip_route_input_noref
);
2094 /* called with rcu_read_lock held */
2095 int ip_route_input_rcu(struct sk_buff
*skb
, __be32 daddr
, __be32 saddr
,
2096 u8 tos
, struct net_device
*dev
, struct fib_result
*res
)
2098 /* Multicast recognition logic is moved from route cache to here.
2099 The problem was that too many Ethernet cards have broken/missing
2100 hardware multicast filters :-( As result the host on multicasting
2101 network acquires a lot of useless route cache entries, sort of
2102 SDR messages from all the world. Now we try to get rid of them.
2103 Really, provided software IP multicast filter is organized
2104 reasonably (at least, hashed), it does not result in a slowdown
2105 comparing with route cache reject entries.
2106 Note, that multicast routers are not affected, because
2107 route cache entry is created eventually.
2109 if (ipv4_is_multicast(daddr
)) {
2110 struct in_device
*in_dev
= __in_dev_get_rcu(dev
);
2115 our
= ip_check_mc_rcu(in_dev
, daddr
, saddr
,
2116 ip_hdr(skb
)->protocol
);
2118 /* check l3 master if no match yet */
2119 if ((!in_dev
|| !our
) && netif_is_l3_slave(dev
)) {
2120 struct in_device
*l3_in_dev
;
2122 l3_in_dev
= __in_dev_get_rcu(skb
->dev
);
2124 our
= ip_check_mc_rcu(l3_in_dev
, daddr
, saddr
,
2125 ip_hdr(skb
)->protocol
);
2129 #ifdef CONFIG_IP_MROUTE
2131 (!ipv4_is_local_multicast(daddr
) &&
2132 IN_DEV_MFORWARD(in_dev
))
2135 err
= ip_route_input_mc(skb
, daddr
, saddr
,
2141 return ip_route_input_slow(skb
, daddr
, saddr
, tos
, dev
, res
);
2144 /* called with rcu_read_lock() */
2145 static struct rtable
*__mkroute_output(const struct fib_result
*res
,
2146 const struct flowi4
*fl4
, int orig_oif
,
2147 struct net_device
*dev_out
,
2150 struct fib_info
*fi
= res
->fi
;
2151 struct fib_nh_exception
*fnhe
;
2152 struct in_device
*in_dev
;
2153 u16 type
= res
->type
;
2157 in_dev
= __in_dev_get_rcu(dev_out
);
2159 return ERR_PTR(-EINVAL
);
2161 if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev
)))
2162 if (ipv4_is_loopback(fl4
->saddr
) &&
2163 !(dev_out
->flags
& IFF_LOOPBACK
) &&
2164 !netif_is_l3_master(dev_out
))
2165 return ERR_PTR(-EINVAL
);
2167 if (ipv4_is_lbcast(fl4
->daddr
))
2168 type
= RTN_BROADCAST
;
2169 else if (ipv4_is_multicast(fl4
->daddr
))
2170 type
= RTN_MULTICAST
;
2171 else if (ipv4_is_zeronet(fl4
->daddr
))
2172 return ERR_PTR(-EINVAL
);
2174 if (dev_out
->flags
& IFF_LOOPBACK
)
2175 flags
|= RTCF_LOCAL
;
2178 if (type
== RTN_BROADCAST
) {
2179 flags
|= RTCF_BROADCAST
| RTCF_LOCAL
;
2181 } else if (type
== RTN_MULTICAST
) {
2182 flags
|= RTCF_MULTICAST
| RTCF_LOCAL
;
2183 if (!ip_check_mc_rcu(in_dev
, fl4
->daddr
, fl4
->saddr
,
2185 flags
&= ~RTCF_LOCAL
;
2188 /* If multicast route do not exist use
2189 * default one, but do not gateway in this case.
2192 if (fi
&& res
->prefixlen
< 4)
2194 } else if ((type
== RTN_LOCAL
) && (orig_oif
!= 0) &&
2195 (orig_oif
!= dev_out
->ifindex
)) {
2196 /* For local routes that require a particular output interface
2197 * we do not want to cache the result. Caching the result
2198 * causes incorrect behaviour when there are multiple source
2199 * addresses on the interface, the end result being that if the
2200 * intended recipient is waiting on that interface for the
2201 * packet he won't receive it because it will be delivered on
2202 * the loopback interface and the IP_PKTINFO ipi_ifindex will
2203 * be set to the loopback interface as well.
2209 do_cache
&= fi
!= NULL
;
2211 struct rtable __rcu
**prth
;
2212 struct fib_nh
*nh
= &FIB_RES_NH(*res
);
2214 fnhe
= find_exception(nh
, fl4
->daddr
);
2216 prth
= &fnhe
->fnhe_rth_output
;
2217 rth
= rcu_dereference(*prth
);
2218 if (rth
&& rth
->dst
.expires
&&
2219 time_after(jiffies
, rth
->dst
.expires
)) {
2220 ip_del_fnhe(nh
, fl4
->daddr
);
2227 if (unlikely(fl4
->flowi4_flags
&
2228 FLOWI_FLAG_KNOWN_NH
&&
2230 nh
->nh_scope
== RT_SCOPE_LINK
))) {
2234 prth
= raw_cpu_ptr(nh
->nh_pcpu_rth_output
);
2235 rth
= rcu_dereference(*prth
);
2238 if (rt_cache_valid(rth
) && dst_hold_safe(&rth
->dst
))
2243 rth
= rt_dst_alloc(dev_out
, flags
, type
,
2244 IN_DEV_CONF_GET(in_dev
, NOPOLICY
),
2245 IN_DEV_CONF_GET(in_dev
, NOXFRM
),
2248 return ERR_PTR(-ENOBUFS
);
2250 rth
->rt_iif
= orig_oif
? : 0;
2252 rth
->rt_table_id
= res
->table
->tb_id
;
2254 RT_CACHE_STAT_INC(out_slow_tot
);
2256 if (flags
& (RTCF_BROADCAST
| RTCF_MULTICAST
)) {
2257 if (flags
& RTCF_LOCAL
&&
2258 !(dev_out
->flags
& IFF_LOOPBACK
)) {
2259 rth
->dst
.output
= ip_mc_output
;
2260 RT_CACHE_STAT_INC(out_slow_mc
);
2262 #ifdef CONFIG_IP_MROUTE
2263 if (type
== RTN_MULTICAST
) {
2264 if (IN_DEV_MFORWARD(in_dev
) &&
2265 !ipv4_is_local_multicast(fl4
->daddr
)) {
2266 rth
->dst
.input
= ip_mr_input
;
2267 rth
->dst
.output
= ip_mc_output
;
2273 rt_set_nexthop(rth
, fl4
->daddr
, res
, fnhe
, fi
, type
, 0, do_cache
);
2274 set_lwt_redirect(rth
);
2280 * Major route resolver routine.
2283 struct rtable
*ip_route_output_key_hash(struct net
*net
, struct flowi4
*fl4
,
2284 const struct sk_buff
*skb
)
2286 __u8 tos
= RT_FL_TOS(fl4
);
2287 struct fib_result res
;
2294 fl4
->flowi4_iif
= LOOPBACK_IFINDEX
;
2295 fl4
->flowi4_tos
= tos
& IPTOS_RT_MASK
;
2296 fl4
->flowi4_scope
= ((tos
& RTO_ONLINK
) ?
2297 RT_SCOPE_LINK
: RT_SCOPE_UNIVERSE
);
2300 rth
= ip_route_output_key_hash_rcu(net
, fl4
, &res
, skb
);
2305 EXPORT_SYMBOL_GPL(ip_route_output_key_hash
);
2307 struct rtable
*ip_route_output_key_hash_rcu(struct net
*net
, struct flowi4
*fl4
,
2308 struct fib_result
*res
,
2309 const struct sk_buff
*skb
)
2311 struct net_device
*dev_out
= NULL
;
2312 int orig_oif
= fl4
->flowi4_oif
;
2313 unsigned int flags
= 0;
2315 int err
= -ENETUNREACH
;
2318 rth
= ERR_PTR(-EINVAL
);
2319 if (ipv4_is_multicast(fl4
->saddr
) ||
2320 ipv4_is_lbcast(fl4
->saddr
) ||
2321 ipv4_is_zeronet(fl4
->saddr
))
2324 /* I removed check for oif == dev_out->oif here.
2325 It was wrong for two reasons:
2326 1. ip_dev_find(net, saddr) can return wrong iface, if saddr
2327 is assigned to multiple interfaces.
2328 2. Moreover, we are allowed to send packets with saddr
2329 of another iface. --ANK
2332 if (fl4
->flowi4_oif
== 0 &&
2333 (ipv4_is_multicast(fl4
->daddr
) ||
2334 ipv4_is_lbcast(fl4
->daddr
))) {
2335 /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */
2336 dev_out
= __ip_dev_find(net
, fl4
->saddr
, false);
2340 /* Special hack: user can direct multicasts
2341 and limited broadcast via necessary interface
2342 without fiddling with IP_MULTICAST_IF or IP_PKTINFO.
2343 This hack is not just for fun, it allows
2344 vic,vat and friends to work.
2345 They bind socket to loopback, set ttl to zero
2346 and expect that it will work.
2347 From the viewpoint of routing cache they are broken,
2348 because we are not allowed to build multicast path
2349 with loopback source addr (look, routing cache
2350 cannot know, that ttl is zero, so that packet
2351 will not leave this host and route is valid).
2352 Luckily, this hack is good workaround.
2355 fl4
->flowi4_oif
= dev_out
->ifindex
;
2359 if (!(fl4
->flowi4_flags
& FLOWI_FLAG_ANYSRC
)) {
2360 /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */
2361 if (!__ip_dev_find(net
, fl4
->saddr
, false))
2367 if (fl4
->flowi4_oif
) {
2368 dev_out
= dev_get_by_index_rcu(net
, fl4
->flowi4_oif
);
2369 rth
= ERR_PTR(-ENODEV
);
2373 /* RACE: Check return value of inet_select_addr instead. */
2374 if (!(dev_out
->flags
& IFF_UP
) || !__in_dev_get_rcu(dev_out
)) {
2375 rth
= ERR_PTR(-ENETUNREACH
);
2378 if (ipv4_is_local_multicast(fl4
->daddr
) ||
2379 ipv4_is_lbcast(fl4
->daddr
) ||
2380 fl4
->flowi4_proto
== IPPROTO_IGMP
) {
2382 fl4
->saddr
= inet_select_addr(dev_out
, 0,
2387 if (ipv4_is_multicast(fl4
->daddr
))
2388 fl4
->saddr
= inet_select_addr(dev_out
, 0,
2390 else if (!fl4
->daddr
)
2391 fl4
->saddr
= inet_select_addr(dev_out
, 0,
2397 fl4
->daddr
= fl4
->saddr
;
2399 fl4
->daddr
= fl4
->saddr
= htonl(INADDR_LOOPBACK
);
2400 dev_out
= net
->loopback_dev
;
2401 fl4
->flowi4_oif
= LOOPBACK_IFINDEX
;
2402 res
->type
= RTN_LOCAL
;
2403 flags
|= RTCF_LOCAL
;
2407 err
= fib_lookup(net
, fl4
, res
, 0);
2411 if (fl4
->flowi4_oif
&&
2412 (ipv4_is_multicast(fl4
->daddr
) ||
2413 !netif_index_is_l3_master(net
, fl4
->flowi4_oif
))) {
2414 /* Apparently, routing tables are wrong. Assume,
2415 that the destination is on link.
2418 Because we are allowed to send to iface
2419 even if it has NO routes and NO assigned
2420 addresses. When oif is specified, routing
2421 tables are looked up with only one purpose:
2422 to catch if destination is gatewayed, rather than
2423 direct. Moreover, if MSG_DONTROUTE is set,
2424 we send packet, ignoring both routing tables
2425 and ifaddr state. --ANK
2428 We could make it even if oif is unknown,
2429 likely IPv6, but we do not.
2432 if (fl4
->saddr
== 0)
2433 fl4
->saddr
= inet_select_addr(dev_out
, 0,
2435 res
->type
= RTN_UNICAST
;
2442 if (res
->type
== RTN_LOCAL
) {
2444 if (res
->fi
->fib_prefsrc
)
2445 fl4
->saddr
= res
->fi
->fib_prefsrc
;
2447 fl4
->saddr
= fl4
->daddr
;
2450 /* L3 master device is the loopback for that domain */
2451 dev_out
= l3mdev_master_dev_rcu(FIB_RES_DEV(*res
)) ? :
2453 fl4
->flowi4_oif
= dev_out
->ifindex
;
2454 flags
|= RTCF_LOCAL
;
2458 fib_select_path(net
, res
, fl4
, skb
);
2460 dev_out
= FIB_RES_DEV(*res
);
2461 fl4
->flowi4_oif
= dev_out
->ifindex
;
2465 rth
= __mkroute_output(res
, fl4
, orig_oif
, dev_out
, flags
);
2471 static struct dst_entry
*ipv4_blackhole_dst_check(struct dst_entry
*dst
, u32 cookie
)
2476 static unsigned int ipv4_blackhole_mtu(const struct dst_entry
*dst
)
2478 unsigned int mtu
= dst_metric_raw(dst
, RTAX_MTU
);
2480 return mtu
? : dst
->dev
->mtu
;
2483 static void ipv4_rt_blackhole_update_pmtu(struct dst_entry
*dst
, struct sock
*sk
,
2484 struct sk_buff
*skb
, u32 mtu
)
2488 static void ipv4_rt_blackhole_redirect(struct dst_entry
*dst
, struct sock
*sk
,
2489 struct sk_buff
*skb
)
2493 static u32
*ipv4_rt_blackhole_cow_metrics(struct dst_entry
*dst
,
2499 static struct dst_ops ipv4_dst_blackhole_ops
= {
2501 .check
= ipv4_blackhole_dst_check
,
2502 .mtu
= ipv4_blackhole_mtu
,
2503 .default_advmss
= ipv4_default_advmss
,
2504 .update_pmtu
= ipv4_rt_blackhole_update_pmtu
,
2505 .redirect
= ipv4_rt_blackhole_redirect
,
2506 .cow_metrics
= ipv4_rt_blackhole_cow_metrics
,
2507 .neigh_lookup
= ipv4_neigh_lookup
,
2510 struct dst_entry
*ipv4_blackhole_route(struct net
*net
, struct dst_entry
*dst_orig
)
2512 struct rtable
*ort
= (struct rtable
*) dst_orig
;
2515 rt
= dst_alloc(&ipv4_dst_blackhole_ops
, NULL
, 1, DST_OBSOLETE_DEAD
, 0);
2517 struct dst_entry
*new = &rt
->dst
;
2520 new->input
= dst_discard
;
2521 new->output
= dst_discard_out
;
2523 new->dev
= net
->loopback_dev
;
2527 rt
->rt_is_input
= ort
->rt_is_input
;
2528 rt
->rt_iif
= ort
->rt_iif
;
2529 rt
->rt_pmtu
= ort
->rt_pmtu
;
2531 rt
->rt_genid
= rt_genid_ipv4(net
);
2532 rt
->rt_flags
= ort
->rt_flags
;
2533 rt
->rt_type
= ort
->rt_type
;
2534 rt
->rt_gateway
= ort
->rt_gateway
;
2535 rt
->rt_uses_gateway
= ort
->rt_uses_gateway
;
2537 INIT_LIST_HEAD(&rt
->rt_uncached
);
2540 dst_release(dst_orig
);
2542 return rt
? &rt
->dst
: ERR_PTR(-ENOMEM
);
2545 struct rtable
*ip_route_output_flow(struct net
*net
, struct flowi4
*flp4
,
2546 const struct sock
*sk
)
2548 struct rtable
*rt
= __ip_route_output_key(net
, flp4
);
2553 if (flp4
->flowi4_proto
)
2554 rt
= (struct rtable
*)xfrm_lookup_route(net
, &rt
->dst
,
2555 flowi4_to_flowi(flp4
),
2560 EXPORT_SYMBOL_GPL(ip_route_output_flow
);
2562 /* called with rcu_read_lock held */
2563 static int rt_fill_info(struct net
*net
, __be32 dst
, __be32 src
, u32 table_id
,
2564 struct flowi4
*fl4
, struct sk_buff
*skb
, u32 portid
,
2567 struct rtable
*rt
= skb_rtable(skb
);
2569 struct nlmsghdr
*nlh
;
2570 unsigned long expires
= 0;
2572 u32 metrics
[RTAX_MAX
];
2574 nlh
= nlmsg_put(skb
, portid
, seq
, RTM_NEWROUTE
, sizeof(*r
), 0);
2578 r
= nlmsg_data(nlh
);
2579 r
->rtm_family
= AF_INET
;
2580 r
->rtm_dst_len
= 32;
2582 r
->rtm_tos
= fl4
->flowi4_tos
;
2583 r
->rtm_table
= table_id
< 256 ? table_id
: RT_TABLE_COMPAT
;
2584 if (nla_put_u32(skb
, RTA_TABLE
, table_id
))
2585 goto nla_put_failure
;
2586 r
->rtm_type
= rt
->rt_type
;
2587 r
->rtm_scope
= RT_SCOPE_UNIVERSE
;
2588 r
->rtm_protocol
= RTPROT_UNSPEC
;
2589 r
->rtm_flags
= (rt
->rt_flags
& ~0xFFFF) | RTM_F_CLONED
;
2590 if (rt
->rt_flags
& RTCF_NOTIFY
)
2591 r
->rtm_flags
|= RTM_F_NOTIFY
;
2592 if (IPCB(skb
)->flags
& IPSKB_DOREDIRECT
)
2593 r
->rtm_flags
|= RTCF_DOREDIRECT
;
2595 if (nla_put_in_addr(skb
, RTA_DST
, dst
))
2596 goto nla_put_failure
;
2598 r
->rtm_src_len
= 32;
2599 if (nla_put_in_addr(skb
, RTA_SRC
, src
))
2600 goto nla_put_failure
;
2603 nla_put_u32(skb
, RTA_OIF
, rt
->dst
.dev
->ifindex
))
2604 goto nla_put_failure
;
2605 #ifdef CONFIG_IP_ROUTE_CLASSID
2606 if (rt
->dst
.tclassid
&&
2607 nla_put_u32(skb
, RTA_FLOW
, rt
->dst
.tclassid
))
2608 goto nla_put_failure
;
2610 if (!rt_is_input_route(rt
) &&
2611 fl4
->saddr
!= src
) {
2612 if (nla_put_in_addr(skb
, RTA_PREFSRC
, fl4
->saddr
))
2613 goto nla_put_failure
;
2615 if (rt
->rt_uses_gateway
&&
2616 nla_put_in_addr(skb
, RTA_GATEWAY
, rt
->rt_gateway
))
2617 goto nla_put_failure
;
2619 expires
= rt
->dst
.expires
;
2621 unsigned long now
= jiffies
;
2623 if (time_before(now
, expires
))
2629 memcpy(metrics
, dst_metrics_ptr(&rt
->dst
), sizeof(metrics
));
2630 if (rt
->rt_pmtu
&& expires
)
2631 metrics
[RTAX_MTU
- 1] = rt
->rt_pmtu
;
2632 if (rtnetlink_put_metrics(skb
, metrics
) < 0)
2633 goto nla_put_failure
;
2635 if (fl4
->flowi4_mark
&&
2636 nla_put_u32(skb
, RTA_MARK
, fl4
->flowi4_mark
))
2637 goto nla_put_failure
;
2639 if (!uid_eq(fl4
->flowi4_uid
, INVALID_UID
) &&
2640 nla_put_u32(skb
, RTA_UID
,
2641 from_kuid_munged(current_user_ns(), fl4
->flowi4_uid
)))
2642 goto nla_put_failure
;
2644 error
= rt
->dst
.error
;
2646 if (rt_is_input_route(rt
)) {
2647 #ifdef CONFIG_IP_MROUTE
2648 if (ipv4_is_multicast(dst
) && !ipv4_is_local_multicast(dst
) &&
2649 IPV4_DEVCONF_ALL(net
, MC_FORWARDING
)) {
2650 int err
= ipmr_get_route(net
, skb
,
2651 fl4
->saddr
, fl4
->daddr
,
2657 goto nla_put_failure
;
2661 if (nla_put_u32(skb
, RTA_IIF
, skb
->dev
->ifindex
))
2662 goto nla_put_failure
;
2665 if (rtnl_put_cacheinfo(skb
, &rt
->dst
, 0, expires
, error
) < 0)
2666 goto nla_put_failure
;
2668 nlmsg_end(skb
, nlh
);
2672 nlmsg_cancel(skb
, nlh
);
2676 static int inet_rtm_getroute(struct sk_buff
*in_skb
, struct nlmsghdr
*nlh
,
2677 struct netlink_ext_ack
*extack
)
2679 struct net
*net
= sock_net(in_skb
->sk
);
2681 struct nlattr
*tb
[RTA_MAX
+1];
2682 struct fib_result res
= {};
2683 struct rtable
*rt
= NULL
;
2690 struct sk_buff
*skb
;
2691 u32 table_id
= RT_TABLE_MAIN
;
2694 err
= nlmsg_parse(nlh
, sizeof(*rtm
), tb
, RTA_MAX
, rtm_ipv4_policy
,
2699 rtm
= nlmsg_data(nlh
);
2701 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
2707 /* Reserve room for dummy headers, this skb can pass
2708 through good chunk of routing engine.
2710 skb_reset_mac_header(skb
);
2711 skb_reset_network_header(skb
);
2713 src
= tb
[RTA_SRC
] ? nla_get_in_addr(tb
[RTA_SRC
]) : 0;
2714 dst
= tb
[RTA_DST
] ? nla_get_in_addr(tb
[RTA_DST
]) : 0;
2715 iif
= tb
[RTA_IIF
] ? nla_get_u32(tb
[RTA_IIF
]) : 0;
2716 mark
= tb
[RTA_MARK
] ? nla_get_u32(tb
[RTA_MARK
]) : 0;
2718 uid
= make_kuid(current_user_ns(), nla_get_u32(tb
[RTA_UID
]));
2720 uid
= (iif
? INVALID_UID
: current_uid());
2722 /* Bugfix: need to give ip_route_input enough of an IP header to
2725 ip_hdr(skb
)->protocol
= IPPROTO_UDP
;
2726 ip_hdr(skb
)->saddr
= src
;
2727 ip_hdr(skb
)->daddr
= dst
;
2729 skb_reserve(skb
, MAX_HEADER
+ sizeof(struct iphdr
));
2731 memset(&fl4
, 0, sizeof(fl4
));
2734 fl4
.flowi4_tos
= rtm
->rtm_tos
;
2735 fl4
.flowi4_oif
= tb
[RTA_OIF
] ? nla_get_u32(tb
[RTA_OIF
]) : 0;
2736 fl4
.flowi4_mark
= mark
;
2737 fl4
.flowi4_uid
= uid
;
2742 struct net_device
*dev
;
2744 dev
= dev_get_by_index_rcu(net
, iif
);
2750 skb
->protocol
= htons(ETH_P_IP
);
2753 err
= ip_route_input_rcu(skb
, dst
, src
, rtm
->rtm_tos
,
2756 rt
= skb_rtable(skb
);
2757 if (err
== 0 && rt
->dst
.error
)
2758 err
= -rt
->dst
.error
;
2760 rt
= ip_route_output_key_hash_rcu(net
, &fl4
, &res
, skb
);
2765 skb_dst_set(skb
, &rt
->dst
);
2771 if (rtm
->rtm_flags
& RTM_F_NOTIFY
)
2772 rt
->rt_flags
|= RTCF_NOTIFY
;
2774 if (rtm
->rtm_flags
& RTM_F_LOOKUP_TABLE
)
2775 table_id
= rt
->rt_table_id
;
2777 if (rtm
->rtm_flags
& RTM_F_FIB_MATCH
) {
2779 err
= fib_props
[res
.type
].error
;
2781 err
= -EHOSTUNREACH
;
2784 err
= fib_dump_info(skb
, NETLINK_CB(in_skb
).portid
,
2785 nlh
->nlmsg_seq
, RTM_NEWROUTE
, table_id
,
2786 rt
->rt_type
, res
.prefix
, res
.prefixlen
,
2787 fl4
.flowi4_tos
, res
.fi
, 0);
2789 err
= rt_fill_info(net
, dst
, src
, table_id
, &fl4
, skb
,
2790 NETLINK_CB(in_skb
).portid
, nlh
->nlmsg_seq
);
2797 err
= rtnl_unicast(skb
, net
, NETLINK_CB(in_skb
).portid
);
2807 void ip_rt_multicast_event(struct in_device
*in_dev
)
2809 rt_cache_flush(dev_net(in_dev
->dev
));
2812 #ifdef CONFIG_SYSCTL
2813 static int ip_rt_gc_interval __read_mostly
= 60 * HZ
;
2814 static int ip_rt_gc_min_interval __read_mostly
= HZ
/ 2;
2815 static int ip_rt_gc_elasticity __read_mostly
= 8;
2817 static int ipv4_sysctl_rtcache_flush(struct ctl_table
*__ctl
, int write
,
2818 void __user
*buffer
,
2819 size_t *lenp
, loff_t
*ppos
)
2821 struct net
*net
= (struct net
*)__ctl
->extra1
;
2824 rt_cache_flush(net
);
2825 fnhe_genid_bump(net
);
2832 static struct ctl_table ipv4_route_table
[] = {
2834 .procname
= "gc_thresh",
2835 .data
= &ipv4_dst_ops
.gc_thresh
,
2836 .maxlen
= sizeof(int),
2838 .proc_handler
= proc_dointvec
,
2841 .procname
= "max_size",
2842 .data
= &ip_rt_max_size
,
2843 .maxlen
= sizeof(int),
2845 .proc_handler
= proc_dointvec
,
2848 /* Deprecated. Use gc_min_interval_ms */
2850 .procname
= "gc_min_interval",
2851 .data
= &ip_rt_gc_min_interval
,
2852 .maxlen
= sizeof(int),
2854 .proc_handler
= proc_dointvec_jiffies
,
2857 .procname
= "gc_min_interval_ms",
2858 .data
= &ip_rt_gc_min_interval
,
2859 .maxlen
= sizeof(int),
2861 .proc_handler
= proc_dointvec_ms_jiffies
,
2864 .procname
= "gc_timeout",
2865 .data
= &ip_rt_gc_timeout
,
2866 .maxlen
= sizeof(int),
2868 .proc_handler
= proc_dointvec_jiffies
,
2871 .procname
= "gc_interval",
2872 .data
= &ip_rt_gc_interval
,
2873 .maxlen
= sizeof(int),
2875 .proc_handler
= proc_dointvec_jiffies
,
2878 .procname
= "redirect_load",
2879 .data
= &ip_rt_redirect_load
,
2880 .maxlen
= sizeof(int),
2882 .proc_handler
= proc_dointvec
,
2885 .procname
= "redirect_number",
2886 .data
= &ip_rt_redirect_number
,
2887 .maxlen
= sizeof(int),
2889 .proc_handler
= proc_dointvec
,
2892 .procname
= "redirect_silence",
2893 .data
= &ip_rt_redirect_silence
,
2894 .maxlen
= sizeof(int),
2896 .proc_handler
= proc_dointvec
,
2899 .procname
= "error_cost",
2900 .data
= &ip_rt_error_cost
,
2901 .maxlen
= sizeof(int),
2903 .proc_handler
= proc_dointvec
,
2906 .procname
= "error_burst",
2907 .data
= &ip_rt_error_burst
,
2908 .maxlen
= sizeof(int),
2910 .proc_handler
= proc_dointvec
,
2913 .procname
= "gc_elasticity",
2914 .data
= &ip_rt_gc_elasticity
,
2915 .maxlen
= sizeof(int),
2917 .proc_handler
= proc_dointvec
,
2920 .procname
= "mtu_expires",
2921 .data
= &ip_rt_mtu_expires
,
2922 .maxlen
= sizeof(int),
2924 .proc_handler
= proc_dointvec_jiffies
,
2927 .procname
= "min_pmtu",
2928 .data
= &ip_rt_min_pmtu
,
2929 .maxlen
= sizeof(int),
2931 .proc_handler
= proc_dointvec
,
2934 .procname
= "min_adv_mss",
2935 .data
= &ip_rt_min_advmss
,
2936 .maxlen
= sizeof(int),
2938 .proc_handler
= proc_dointvec
,
2943 static struct ctl_table ipv4_route_flush_table
[] = {
2945 .procname
= "flush",
2946 .maxlen
= sizeof(int),
2948 .proc_handler
= ipv4_sysctl_rtcache_flush
,
2953 static __net_init
int sysctl_route_net_init(struct net
*net
)
2955 struct ctl_table
*tbl
;
2957 tbl
= ipv4_route_flush_table
;
2958 if (!net_eq(net
, &init_net
)) {
2959 tbl
= kmemdup(tbl
, sizeof(ipv4_route_flush_table
), GFP_KERNEL
);
2963 /* Don't export sysctls to unprivileged users */
2964 if (net
->user_ns
!= &init_user_ns
)
2965 tbl
[0].procname
= NULL
;
2967 tbl
[0].extra1
= net
;
2969 net
->ipv4
.route_hdr
= register_net_sysctl(net
, "net/ipv4/route", tbl
);
2970 if (!net
->ipv4
.route_hdr
)
2975 if (tbl
!= ipv4_route_flush_table
)
2981 static __net_exit
void sysctl_route_net_exit(struct net
*net
)
2983 struct ctl_table
*tbl
;
2985 tbl
= net
->ipv4
.route_hdr
->ctl_table_arg
;
2986 unregister_net_sysctl_table(net
->ipv4
.route_hdr
);
2987 BUG_ON(tbl
== ipv4_route_flush_table
);
2991 static __net_initdata
struct pernet_operations sysctl_route_ops
= {
2992 .init
= sysctl_route_net_init
,
2993 .exit
= sysctl_route_net_exit
,
2997 static __net_init
int rt_genid_init(struct net
*net
)
2999 atomic_set(&net
->ipv4
.rt_genid
, 0);
3000 atomic_set(&net
->fnhe_genid
, 0);
3001 atomic_set(&net
->ipv4
.dev_addr_genid
, get_random_int());
3005 static __net_initdata
struct pernet_operations rt_genid_ops
= {
3006 .init
= rt_genid_init
,
3009 static int __net_init
ipv4_inetpeer_init(struct net
*net
)
3011 struct inet_peer_base
*bp
= kmalloc(sizeof(*bp
), GFP_KERNEL
);
3015 inet_peer_base_init(bp
);
3016 net
->ipv4
.peers
= bp
;
3020 static void __net_exit
ipv4_inetpeer_exit(struct net
*net
)
3022 struct inet_peer_base
*bp
= net
->ipv4
.peers
;
3024 net
->ipv4
.peers
= NULL
;
3025 inetpeer_invalidate_tree(bp
);
3029 static __net_initdata
struct pernet_operations ipv4_inetpeer_ops
= {
3030 .init
= ipv4_inetpeer_init
,
3031 .exit
= ipv4_inetpeer_exit
,
3034 #ifdef CONFIG_IP_ROUTE_CLASSID
3035 struct ip_rt_acct __percpu
*ip_rt_acct __read_mostly
;
3036 #endif /* CONFIG_IP_ROUTE_CLASSID */
3038 int __init
ip_rt_init(void)
3043 ip_idents
= kmalloc(IP_IDENTS_SZ
* sizeof(*ip_idents
), GFP_KERNEL
);
3045 panic("IP: failed to allocate ip_idents\n");
3047 prandom_bytes(ip_idents
, IP_IDENTS_SZ
* sizeof(*ip_idents
));
3049 ip_tstamps
= kcalloc(IP_IDENTS_SZ
, sizeof(*ip_tstamps
), GFP_KERNEL
);
3051 panic("IP: failed to allocate ip_tstamps\n");
3053 for_each_possible_cpu(cpu
) {
3054 struct uncached_list
*ul
= &per_cpu(rt_uncached_list
, cpu
);
3056 INIT_LIST_HEAD(&ul
->head
);
3057 spin_lock_init(&ul
->lock
);
3059 #ifdef CONFIG_IP_ROUTE_CLASSID
3060 ip_rt_acct
= __alloc_percpu(256 * sizeof(struct ip_rt_acct
), __alignof__(struct ip_rt_acct
));
3062 panic("IP: failed to allocate ip_rt_acct\n");
3065 ipv4_dst_ops
.kmem_cachep
=
3066 kmem_cache_create("ip_dst_cache", sizeof(struct rtable
), 0,
3067 SLAB_HWCACHE_ALIGN
|SLAB_PANIC
, NULL
);
3069 ipv4_dst_blackhole_ops
.kmem_cachep
= ipv4_dst_ops
.kmem_cachep
;
3071 if (dst_entries_init(&ipv4_dst_ops
) < 0)
3072 panic("IP: failed to allocate ipv4_dst_ops counter\n");
3074 if (dst_entries_init(&ipv4_dst_blackhole_ops
) < 0)
3075 panic("IP: failed to allocate ipv4_dst_blackhole_ops counter\n");
3077 ipv4_dst_ops
.gc_thresh
= ~0;
3078 ip_rt_max_size
= INT_MAX
;
3083 if (ip_rt_proc_init())
3084 pr_err("Unable to create route proc files\n");
3089 rtnl_register(PF_INET
, RTM_GETROUTE
, inet_rtm_getroute
, NULL
, NULL
);
3091 #ifdef CONFIG_SYSCTL
3092 register_pernet_subsys(&sysctl_route_ops
);
3094 register_pernet_subsys(&rt_genid_ops
);
3095 register_pernet_subsys(&ipv4_inetpeer_ops
);
3099 #ifdef CONFIG_SYSCTL
3101 * We really need to sanitize the damn ipv4 init order, then all
3102 * this nonsense will go away.
3104 void __init
ip_static_sysctl_init(void)
3106 register_net_sysctl(&init_net
, "net/ipv4/route", ipv4_route_table
);