1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24#define KMSG_COMPONENT "IPVS"
25#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
26
27#include <linux/kernel.h>
28#include <linux/slab.h>
29#include <linux/tcp.h>
30#include <net/ip.h>
31#include <net/gue.h>
32#include <net/gre.h>
33#include <net/tcp.h>
34#include <net/udp.h>
35#include <net/icmp.h>
36#include <net/route.h>
37#include <net/ipv6.h>
38#include <net/ip6_route.h>
39#include <net/ip_tunnels.h>
40#include <net/ip6_checksum.h>
41#include <net/addrconf.h>
42#include <linux/icmpv6.h>
43#include <linux/netfilter.h>
44#include <linux/netfilter_ipv4.h>
45
46#include <net/ip_vs.h>
47
48enum {
49 IP_VS_RT_MODE_LOCAL = 1,
50 IP_VS_RT_MODE_NON_LOCAL = 2,
51 IP_VS_RT_MODE_RDR = 4,
52
53
54 IP_VS_RT_MODE_CONNECT = 8,
55 IP_VS_RT_MODE_KNOWN_NH = 16,
56 IP_VS_RT_MODE_TUNNEL = 32,
57};
58
59static inline struct ip_vs_dest_dst *ip_vs_dest_dst_alloc(void)
60{
61 return kmalloc(sizeof(struct ip_vs_dest_dst), GFP_ATOMIC);
62}
63
64static inline void ip_vs_dest_dst_free(struct ip_vs_dest_dst *dest_dst)
65{
66 kfree(dest_dst);
67}
68
69
70
71
72static inline void
73__ip_vs_dst_set(struct ip_vs_dest *dest, struct ip_vs_dest_dst *dest_dst,
74 struct dst_entry *dst, u32 dst_cookie)
75{
76 struct ip_vs_dest_dst *old;
77
78 old = rcu_dereference_protected(dest->dest_dst,
79 lockdep_is_held(&dest->dst_lock));
80
81 if (dest_dst) {
82 dest_dst->dst_cache = dst;
83 dest_dst->dst_cookie = dst_cookie;
84 }
85 rcu_assign_pointer(dest->dest_dst, dest_dst);
86
87 if (old)
88 call_rcu(&old->rcu_head, ip_vs_dest_dst_rcu_free);
89}
90
91static inline struct ip_vs_dest_dst *
92__ip_vs_dst_check(struct ip_vs_dest *dest)
93{
94 struct ip_vs_dest_dst *dest_dst = rcu_dereference(dest->dest_dst);
95 struct dst_entry *dst;
96
97 if (!dest_dst)
98 return NULL;
99 dst = dest_dst->dst_cache;
100 if (dst->obsolete &&
101 dst->ops->check(dst, dest_dst->dst_cookie) == NULL)
102 return NULL;
103 return dest_dst;
104}
105
106static inline bool
107__mtu_check_toobig_v6(const struct sk_buff *skb, u32 mtu)
108{
109 if (IP6CB(skb)->frag_max_size) {
110
111
112
113 if (IP6CB(skb)->frag_max_size > mtu)
114 return true;
115 }
116 else if (skb->len > mtu && !skb_is_gso(skb)) {
117 return true;
118 }
119 return false;
120}
121
122
123static struct rtable *do_output_route4(struct net *net, __be32 daddr,
124 int rt_mode, __be32 *saddr)
125{
126 struct flowi4 fl4;
127 struct rtable *rt;
128 bool loop = false;
129
130 memset(&fl4, 0, sizeof(fl4));
131 fl4.daddr = daddr;
132 fl4.flowi4_flags = (rt_mode & IP_VS_RT_MODE_KNOWN_NH) ?
133 FLOWI_FLAG_KNOWN_NH : 0;
134
135retry:
136 rt = ip_route_output_key(net, &fl4);
137 if (IS_ERR(rt)) {
138
139 if (PTR_ERR(rt) == -EINVAL && *saddr &&
140 rt_mode & IP_VS_RT_MODE_CONNECT && !loop) {
141 *saddr = 0;
142 flowi4_update_output(&fl4, 0, 0, daddr, 0);
143 goto retry;
144 }
145 IP_VS_DBG_RL("ip_route_output error, dest: %pI4\n", &daddr);
146 return NULL;
147 } else if (!*saddr && rt_mode & IP_VS_RT_MODE_CONNECT && fl4.saddr) {
148 ip_rt_put(rt);
149 *saddr = fl4.saddr;
150 flowi4_update_output(&fl4, 0, 0, daddr, fl4.saddr);
151 loop = true;
152 goto retry;
153 }
154 *saddr = fl4.saddr;
155 return rt;
156}
157
158#ifdef CONFIG_IP_VS_IPV6
159static inline int __ip_vs_is_local_route6(struct rt6_info *rt)
160{
161 return rt->dst.dev && rt->dst.dev->flags & IFF_LOOPBACK;
162}
163#endif
164
165static inline bool crosses_local_route_boundary(int skb_af, struct sk_buff *skb,
166 int rt_mode,
167 bool new_rt_is_local)
168{
169 bool rt_mode_allow_local = !!(rt_mode & IP_VS_RT_MODE_LOCAL);
170 bool rt_mode_allow_non_local = !!(rt_mode & IP_VS_RT_MODE_NON_LOCAL);
171 bool rt_mode_allow_redirect = !!(rt_mode & IP_VS_RT_MODE_RDR);
172 bool source_is_loopback;
173 bool old_rt_is_local;
174
175#ifdef CONFIG_IP_VS_IPV6
176 if (skb_af == AF_INET6) {
177 int addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
178
179 source_is_loopback =
180 (!skb->dev || skb->dev->flags & IFF_LOOPBACK) &&
181 (addr_type & IPV6_ADDR_LOOPBACK);
182 old_rt_is_local = __ip_vs_is_local_route6(
183 (struct rt6_info *)skb_dst(skb));
184 } else
185#endif
186 {
187 source_is_loopback = ipv4_is_loopback(ip_hdr(skb)->saddr);
188 old_rt_is_local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
189 }
190
191 if (unlikely(new_rt_is_local)) {
192 if (!rt_mode_allow_local)
193 return true;
194 if (!rt_mode_allow_redirect && !old_rt_is_local)
195 return true;
196 } else {
197 if (!rt_mode_allow_non_local)
198 return true;
199 if (source_is_loopback)
200 return true;
201 }
202 return false;
203}
204
205static inline void maybe_update_pmtu(int skb_af, struct sk_buff *skb, int mtu)
206{
207 struct sock *sk = skb->sk;
208 struct rtable *ort = skb_rtable(skb);
209
210 if (!skb->dev && sk && sk_fullsock(sk))
211 ort->dst.ops->update_pmtu(&ort->dst, sk, NULL, mtu, true);
212}
213
214static inline bool ensure_mtu_is_adequate(struct netns_ipvs *ipvs, int skb_af,
215 int rt_mode,
216 struct ip_vs_iphdr *ipvsh,
217 struct sk_buff *skb, int mtu)
218{
219#ifdef CONFIG_IP_VS_IPV6
220 if (skb_af == AF_INET6) {
221 struct net *net = ipvs->net;
222
223 if (unlikely(__mtu_check_toobig_v6(skb, mtu))) {
224 if (!skb->dev)
225 skb->dev = net->loopback_dev;
226
227 if (!ipvsh->fragoffs && !ip_vs_iph_icmp(ipvsh))
228 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
229 IP_VS_DBG(1, "frag needed for %pI6c\n",
230 &ipv6_hdr(skb)->saddr);
231 return false;
232 }
233 } else
234#endif
235 {
236
237
238
239 if ((rt_mode & IP_VS_RT_MODE_TUNNEL) && !sysctl_pmtu_disc(ipvs))
240 return true;
241
242 if (unlikely(ip_hdr(skb)->frag_off & htons(IP_DF) &&
243 skb->len > mtu && !skb_is_gso(skb) &&
244 !ip_vs_iph_icmp(ipvsh))) {
245 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
246 htonl(mtu));
247 IP_VS_DBG(1, "frag needed for %pI4\n",
248 &ip_hdr(skb)->saddr);
249 return false;
250 }
251 }
252
253 return true;
254}
255
256static inline bool decrement_ttl(struct netns_ipvs *ipvs,
257 int skb_af,
258 struct sk_buff *skb)
259{
260 struct net *net = ipvs->net;
261
262#ifdef CONFIG_IP_VS_IPV6
263 if (skb_af == AF_INET6) {
264 struct dst_entry *dst = skb_dst(skb);
265
266
267 if (ipv6_hdr(skb)->hop_limit <= 1) {
268 struct inet6_dev *idev = __in6_dev_get_safely(skb->dev);
269
270
271 skb->dev = dst->dev;
272 icmpv6_send(skb, ICMPV6_TIME_EXCEED,
273 ICMPV6_EXC_HOPLIMIT, 0);
274 __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
275
276 return false;
277 }
278
279
280 if (skb_ensure_writable(skb, sizeof(struct ipv6hdr)))
281 return false;
282
283 ipv6_hdr(skb)->hop_limit--;
284 } else
285#endif
286 {
287 if (ip_hdr(skb)->ttl <= 1) {
288
289 __IP_INC_STATS(net, IPSTATS_MIB_INHDRERRORS);
290 icmp_send(skb, ICMP_TIME_EXCEEDED, ICMP_EXC_TTL, 0);
291 return false;
292 }
293
294
295 if (skb_ensure_writable(skb, sizeof(struct iphdr)))
296 return false;
297
298
299 ip_decrease_ttl(ip_hdr(skb));
300 }
301
302 return true;
303}
304
305
306static int
307__ip_vs_get_out_rt(struct netns_ipvs *ipvs, int skb_af, struct sk_buff *skb,
308 struct ip_vs_dest *dest,
309 __be32 daddr, int rt_mode, __be32 *ret_saddr,
310 struct ip_vs_iphdr *ipvsh)
311{
312 struct net *net = ipvs->net;
313 struct ip_vs_dest_dst *dest_dst;
314 struct rtable *rt;
315 int mtu;
316 int local, noref = 1;
317
318 if (dest) {
319 dest_dst = __ip_vs_dst_check(dest);
320 if (likely(dest_dst))
321 rt = (struct rtable *) dest_dst->dst_cache;
322 else {
323 dest_dst = ip_vs_dest_dst_alloc();
324 spin_lock_bh(&dest->dst_lock);
325 if (!dest_dst) {
326 __ip_vs_dst_set(dest, NULL, NULL, 0);
327 spin_unlock_bh(&dest->dst_lock);
328 goto err_unreach;
329 }
330 rt = do_output_route4(net, dest->addr.ip, rt_mode,
331 &dest_dst->dst_saddr.ip);
332 if (!rt) {
333 __ip_vs_dst_set(dest, NULL, NULL, 0);
334 spin_unlock_bh(&dest->dst_lock);
335 ip_vs_dest_dst_free(dest_dst);
336 goto err_unreach;
337 }
338 __ip_vs_dst_set(dest, dest_dst, &rt->dst, 0);
339 spin_unlock_bh(&dest->dst_lock);
340 IP_VS_DBG(10, "new dst %pI4, src %pI4, refcnt=%d\n",
341 &dest->addr.ip, &dest_dst->dst_saddr.ip,
342 atomic_read(&rt->dst.__refcnt));
343 }
344 if (ret_saddr)
345 *ret_saddr = dest_dst->dst_saddr.ip;
346 } else {
347 __be32 saddr = htonl(INADDR_ANY);
348
349 noref = 0;
350
351
352
353
354 rt_mode &= ~IP_VS_RT_MODE_CONNECT;
355 rt = do_output_route4(net, daddr, rt_mode, &saddr);
356 if (!rt)
357 goto err_unreach;
358 if (ret_saddr)
359 *ret_saddr = saddr;
360 }
361
362 local = (rt->rt_flags & RTCF_LOCAL) ? 1 : 0;
363 if (unlikely(crosses_local_route_boundary(skb_af, skb, rt_mode,
364 local))) {
365 IP_VS_DBG_RL("We are crossing local and non-local addresses"
366 " daddr=%pI4\n", &daddr);
367 goto err_put;
368 }
369
370 if (unlikely(local)) {
371
372 if (!noref)
373 ip_rt_put(rt);
374 return local;
375 }
376
377 if (!decrement_ttl(ipvs, skb_af, skb))
378 goto err_put;
379
380 if (likely(!(rt_mode & IP_VS_RT_MODE_TUNNEL))) {
381 mtu = dst_mtu(&rt->dst);
382 } else {
383 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
384 if (!dest)
385 goto err_put;
386 if (dest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
387 mtu -= sizeof(struct udphdr) + sizeof(struct guehdr);
388 if ((dest->tun_flags &
389 IP_VS_TUNNEL_ENCAP_FLAG_REMCSUM) &&
390 skb->ip_summed == CHECKSUM_PARTIAL)
391 mtu -= GUE_PLEN_REMCSUM + GUE_LEN_PRIV;
392 } else if (dest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
393 __be16 tflags = 0;
394
395 if (dest->tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
396 tflags |= TUNNEL_CSUM;
397 mtu -= gre_calc_hlen(tflags);
398 }
399 if (mtu < 68) {
400 IP_VS_DBG_RL("%s(): mtu less than 68\n", __func__);
401 goto err_put;
402 }
403 maybe_update_pmtu(skb_af, skb, mtu);
404 }
405
406 if (!ensure_mtu_is_adequate(ipvs, skb_af, rt_mode, ipvsh, skb, mtu))
407 goto err_put;
408
409 skb_dst_drop(skb);
410 if (noref)
411 skb_dst_set_noref(skb, &rt->dst);
412 else
413 skb_dst_set(skb, &rt->dst);
414
415 return local;
416
417err_put:
418 if (!noref)
419 ip_rt_put(rt);
420 return -1;
421
422err_unreach:
423 dst_link_failure(skb);
424 return -1;
425}
426
427#ifdef CONFIG_IP_VS_IPV6
428static struct dst_entry *
429__ip_vs_route_output_v6(struct net *net, struct in6_addr *daddr,
430 struct in6_addr *ret_saddr, int do_xfrm, int rt_mode)
431{
432 struct dst_entry *dst;
433 struct flowi6 fl6 = {
434 .daddr = *daddr,
435 };
436
437 if (rt_mode & IP_VS_RT_MODE_KNOWN_NH)
438 fl6.flowi6_flags = FLOWI_FLAG_KNOWN_NH;
439
440 dst = ip6_route_output(net, NULL, &fl6);
441 if (dst->error)
442 goto out_err;
443 if (!ret_saddr)
444 return dst;
445 if (ipv6_addr_any(&fl6.saddr) &&
446 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
447 &fl6.daddr, 0, &fl6.saddr) < 0)
448 goto out_err;
449 if (do_xfrm) {
450 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
451 if (IS_ERR(dst)) {
452 dst = NULL;
453 goto out_err;
454 }
455 }
456 *ret_saddr = fl6.saddr;
457 return dst;
458
459out_err:
460 dst_release(dst);
461 IP_VS_DBG_RL("ip6_route_output error, dest: %pI6\n", daddr);
462 return NULL;
463}
464
465
466
467
468static int
469__ip_vs_get_out_rt_v6(struct netns_ipvs *ipvs, int skb_af, struct sk_buff *skb,
470 struct ip_vs_dest *dest,
471 struct in6_addr *daddr, struct in6_addr *ret_saddr,
472 struct ip_vs_iphdr *ipvsh, int do_xfrm, int rt_mode)
473{
474 struct net *net = ipvs->net;
475 struct ip_vs_dest_dst *dest_dst;
476 struct rt6_info *rt;
477 struct dst_entry *dst;
478 int mtu;
479 int local, noref = 1;
480
481 if (dest) {
482 dest_dst = __ip_vs_dst_check(dest);
483 if (likely(dest_dst))
484 rt = (struct rt6_info *) dest_dst->dst_cache;
485 else {
486 u32 cookie;
487
488 dest_dst = ip_vs_dest_dst_alloc();
489 spin_lock_bh(&dest->dst_lock);
490 if (!dest_dst) {
491 __ip_vs_dst_set(dest, NULL, NULL, 0);
492 spin_unlock_bh(&dest->dst_lock);
493 goto err_unreach;
494 }
495 dst = __ip_vs_route_output_v6(net, &dest->addr.in6,
496 &dest_dst->dst_saddr.in6,
497 do_xfrm, rt_mode);
498 if (!dst) {
499 __ip_vs_dst_set(dest, NULL, NULL, 0);
500 spin_unlock_bh(&dest->dst_lock);
501 ip_vs_dest_dst_free(dest_dst);
502 goto err_unreach;
503 }
504 rt = (struct rt6_info *) dst;
505 cookie = rt6_get_cookie(rt);
506 __ip_vs_dst_set(dest, dest_dst, &rt->dst, cookie);
507 spin_unlock_bh(&dest->dst_lock);
508 IP_VS_DBG(10, "new dst %pI6, src %pI6, refcnt=%d\n",
509 &dest->addr.in6, &dest_dst->dst_saddr.in6,
510 atomic_read(&rt->dst.__refcnt));
511 }
512 if (ret_saddr)
513 *ret_saddr = dest_dst->dst_saddr.in6;
514 } else {
515 noref = 0;
516 dst = __ip_vs_route_output_v6(net, daddr, ret_saddr, do_xfrm,
517 rt_mode);
518 if (!dst)
519 goto err_unreach;
520 rt = (struct rt6_info *) dst;
521 }
522
523 local = __ip_vs_is_local_route6(rt);
524
525 if (unlikely(crosses_local_route_boundary(skb_af, skb, rt_mode,
526 local))) {
527 IP_VS_DBG_RL("We are crossing local and non-local addresses"
528 " daddr=%pI6\n", daddr);
529 goto err_put;
530 }
531
532 if (unlikely(local)) {
533
534 if (!noref)
535 dst_release(&rt->dst);
536 return local;
537 }
538
539 if (!decrement_ttl(ipvs, skb_af, skb))
540 goto err_put;
541
542
543 if (likely(!(rt_mode & IP_VS_RT_MODE_TUNNEL)))
544 mtu = dst_mtu(&rt->dst);
545 else {
546 mtu = dst_mtu(&rt->dst) - sizeof(struct ipv6hdr);
547 if (!dest)
548 goto err_put;
549 if (dest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
550 mtu -= sizeof(struct udphdr) + sizeof(struct guehdr);
551 if ((dest->tun_flags &
552 IP_VS_TUNNEL_ENCAP_FLAG_REMCSUM) &&
553 skb->ip_summed == CHECKSUM_PARTIAL)
554 mtu -= GUE_PLEN_REMCSUM + GUE_LEN_PRIV;
555 } else if (dest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
556 __be16 tflags = 0;
557
558 if (dest->tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
559 tflags |= TUNNEL_CSUM;
560 mtu -= gre_calc_hlen(tflags);
561 }
562 if (mtu < IPV6_MIN_MTU) {
563 IP_VS_DBG_RL("%s(): mtu less than %d\n", __func__,
564 IPV6_MIN_MTU);
565 goto err_put;
566 }
567 maybe_update_pmtu(skb_af, skb, mtu);
568 }
569
570 if (!ensure_mtu_is_adequate(ipvs, skb_af, rt_mode, ipvsh, skb, mtu))
571 goto err_put;
572
573 skb_dst_drop(skb);
574 if (noref)
575 skb_dst_set_noref(skb, &rt->dst);
576 else
577 skb_dst_set(skb, &rt->dst);
578
579 return local;
580
581err_put:
582 if (!noref)
583 dst_release(&rt->dst);
584 return -1;
585
586err_unreach:
587
588
589
590
591 if (!skb->dev)
592 skb->dev = skb_dst(skb)->dev;
593
594 dst_link_failure(skb);
595 return -1;
596}
597#endif
598
599
600
601static inline int ip_vs_tunnel_xmit_prepare(struct sk_buff *skb,
602 struct ip_vs_conn *cp)
603{
604 int ret = NF_ACCEPT;
605
606 skb->ipvs_property = 1;
607 if (unlikely(cp->flags & IP_VS_CONN_F_NFCT))
608 ret = ip_vs_confirm_conntrack(skb);
609 if (ret == NF_ACCEPT) {
610 nf_reset_ct(skb);
611 skb_forward_csum(skb);
612 }
613 return ret;
614}
615
616
617
618
619
620
621
622static inline void ip_vs_drop_early_demux_sk(struct sk_buff *skb)
623{
624
625
626
627 if (skb->dev)
628 skb_orphan(skb);
629}
630
631
632static inline int ip_vs_nat_send_or_cont(int pf, struct sk_buff *skb,
633 struct ip_vs_conn *cp, int local)
634{
635 int ret = NF_STOLEN;
636
637 skb->ipvs_property = 1;
638 if (likely(!(cp->flags & IP_VS_CONN_F_NFCT)))
639 ip_vs_notrack(skb);
640 else
641 ip_vs_update_conntrack(skb, cp, 1);
642
643
644
645
646 if (!local || cp->vport != cp->dport ||
647 !ip_vs_addr_equal(cp->af, &cp->vaddr, &cp->daddr))
648 ip_vs_drop_early_demux_sk(skb);
649
650 if (!local) {
651 skb_forward_csum(skb);
652 NF_HOOK(pf, NF_INET_LOCAL_OUT, cp->ipvs->net, NULL, skb,
653 NULL, skb_dst(skb)->dev, dst_output);
654 } else
655 ret = NF_ACCEPT;
656
657 return ret;
658}
659
660
661static inline int ip_vs_send_or_cont(int pf, struct sk_buff *skb,
662 struct ip_vs_conn *cp, int local)
663{
664 int ret = NF_STOLEN;
665
666 skb->ipvs_property = 1;
667 if (likely(!(cp->flags & IP_VS_CONN_F_NFCT)))
668 ip_vs_notrack(skb);
669 if (!local) {
670 ip_vs_drop_early_demux_sk(skb);
671 skb_forward_csum(skb);
672 NF_HOOK(pf, NF_INET_LOCAL_OUT, cp->ipvs->net, NULL, skb,
673 NULL, skb_dst(skb)->dev, dst_output);
674 } else
675 ret = NF_ACCEPT;
676 return ret;
677}
678
679
680
681
682
683int
684ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
685 struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
686{
687
688 return ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 1);
689}
690
691
692
693
694
695
696
697int
698ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
699 struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
700{
701 struct iphdr *iph = ip_hdr(skb);
702
703 EnterFunction(10);
704
705 if (__ip_vs_get_out_rt(cp->ipvs, cp->af, skb, NULL, iph->daddr,
706 IP_VS_RT_MODE_NON_LOCAL, NULL, ipvsh) < 0)
707 goto tx_error;
708
709 ip_send_check(iph);
710
711
712 skb->ignore_df = 1;
713
714 ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 0);
715
716 LeaveFunction(10);
717 return NF_STOLEN;
718
719 tx_error:
720 kfree_skb(skb);
721 LeaveFunction(10);
722 return NF_STOLEN;
723}
724
725#ifdef CONFIG_IP_VS_IPV6
726int
727ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
728 struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
729{
730 struct ipv6hdr *iph = ipv6_hdr(skb);
731
732 EnterFunction(10);
733
734 if (__ip_vs_get_out_rt_v6(cp->ipvs, cp->af, skb, NULL,
735 &iph->daddr, NULL,
736 ipvsh, 0, IP_VS_RT_MODE_NON_LOCAL) < 0)
737 goto tx_error;
738
739
740 skb->ignore_df = 1;
741
742 ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 0);
743
744 LeaveFunction(10);
745 return NF_STOLEN;
746
747 tx_error:
748 kfree_skb(skb);
749 LeaveFunction(10);
750 return NF_STOLEN;
751}
752#endif
753
754
755
756
757
758int
759ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
760 struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
761{
762 struct rtable *rt;
763 int local, rc, was_input;
764
765 EnterFunction(10);
766
767
768 if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT)) {
769 __be16 _pt, *p;
770
771 p = skb_header_pointer(skb, ipvsh->len, sizeof(_pt), &_pt);
772 if (p == NULL)
773 goto tx_error;
774 ip_vs_conn_fill_cport(cp, *p);
775 IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p));
776 }
777
778 was_input = rt_is_input_route(skb_rtable(skb));
779 local = __ip_vs_get_out_rt(cp->ipvs, cp->af, skb, cp->dest, cp->daddr.ip,
780 IP_VS_RT_MODE_LOCAL |
781 IP_VS_RT_MODE_NON_LOCAL |
782 IP_VS_RT_MODE_RDR, NULL, ipvsh);
783 if (local < 0)
784 goto tx_error;
785 rt = skb_rtable(skb);
786
787
788
789
790#if IS_ENABLED(CONFIG_NF_CONNTRACK)
791 if (cp->flags & IP_VS_CONN_F_SYNC && local) {
792 enum ip_conntrack_info ctinfo;
793 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
794
795 if (ct) {
796 IP_VS_DBG_RL_PKT(10, AF_INET, pp, skb, ipvsh->off,
797 "ip_vs_nat_xmit(): "
798 "stopping DNAT to local address");
799 goto tx_error;
800 }
801 }
802#endif
803
804
805 if (local && ipv4_is_loopback(cp->daddr.ip) && was_input) {
806 IP_VS_DBG_RL_PKT(1, AF_INET, pp, skb, ipvsh->off,
807 "ip_vs_nat_xmit(): stopping DNAT to loopback "
808 "address");
809 goto tx_error;
810 }
811
812
813 if (skb_ensure_writable(skb, sizeof(struct iphdr)))
814 goto tx_error;
815
816 if (skb_cow(skb, rt->dst.dev->hard_header_len))
817 goto tx_error;
818
819
820 if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp, ipvsh))
821 goto tx_error;
822 ip_hdr(skb)->daddr = cp->daddr.ip;
823 ip_send_check(ip_hdr(skb));
824
825 IP_VS_DBG_PKT(10, AF_INET, pp, skb, ipvsh->off, "After DNAT");
826
827
828
829
830
831
832 skb->ignore_df = 1;
833
834 rc = ip_vs_nat_send_or_cont(NFPROTO_IPV4, skb, cp, local);
835
836 LeaveFunction(10);
837 return rc;
838
839 tx_error:
840 kfree_skb(skb);
841 LeaveFunction(10);
842 return NF_STOLEN;
843}
844
845#ifdef CONFIG_IP_VS_IPV6
846int
847ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
848 struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
849{
850 struct rt6_info *rt;
851 int local, rc;
852
853 EnterFunction(10);
854
855
856 if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT && !ipvsh->fragoffs)) {
857 __be16 _pt, *p;
858 p = skb_header_pointer(skb, ipvsh->len, sizeof(_pt), &_pt);
859 if (p == NULL)
860 goto tx_error;
861 ip_vs_conn_fill_cport(cp, *p);
862 IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p));
863 }
864
865 local = __ip_vs_get_out_rt_v6(cp->ipvs, cp->af, skb, cp->dest,
866 &cp->daddr.in6,
867 NULL, ipvsh, 0,
868 IP_VS_RT_MODE_LOCAL |
869 IP_VS_RT_MODE_NON_LOCAL |
870 IP_VS_RT_MODE_RDR);
871 if (local < 0)
872 goto tx_error;
873 rt = (struct rt6_info *) skb_dst(skb);
874
875
876
877
878#if IS_ENABLED(CONFIG_NF_CONNTRACK)
879 if (cp->flags & IP_VS_CONN_F_SYNC && local) {
880 enum ip_conntrack_info ctinfo;
881 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
882
883 if (ct) {
884 IP_VS_DBG_RL_PKT(10, AF_INET6, pp, skb, ipvsh->off,
885 "ip_vs_nat_xmit_v6(): "
886 "stopping DNAT to local address");
887 goto tx_error;
888 }
889 }
890#endif
891
892
893 if (local && skb->dev && !(skb->dev->flags & IFF_LOOPBACK) &&
894 ipv6_addr_type(&cp->daddr.in6) & IPV6_ADDR_LOOPBACK) {
895 IP_VS_DBG_RL_PKT(1, AF_INET6, pp, skb, ipvsh->off,
896 "ip_vs_nat_xmit_v6(): "
897 "stopping DNAT to loopback address");
898 goto tx_error;
899 }
900
901
902 if (skb_ensure_writable(skb, sizeof(struct ipv6hdr)))
903 goto tx_error;
904
905 if (skb_cow(skb, rt->dst.dev->hard_header_len))
906 goto tx_error;
907
908
909 if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp, ipvsh))
910 goto tx_error;
911 ipv6_hdr(skb)->daddr = cp->daddr.in6;
912
913 IP_VS_DBG_PKT(10, AF_INET6, pp, skb, ipvsh->off, "After DNAT");
914
915
916
917
918
919
920 skb->ignore_df = 1;
921
922 rc = ip_vs_nat_send_or_cont(NFPROTO_IPV6, skb, cp, local);
923
924 LeaveFunction(10);
925 return rc;
926
927tx_error:
928 LeaveFunction(10);
929 kfree_skb(skb);
930 return NF_STOLEN;
931}
932#endif
933
934
935
936
937
938
939
940static struct sk_buff *
941ip_vs_prepare_tunneled_skb(struct sk_buff *skb, int skb_af,
942 unsigned int max_headroom, __u8 *next_protocol,
943 __u32 *payload_len, __u8 *dsfield, __u8 *ttl,
944 __be16 *df)
945{
946 struct sk_buff *new_skb = NULL;
947 struct iphdr *old_iph = NULL;
948 __u8 old_dsfield;
949#ifdef CONFIG_IP_VS_IPV6
950 struct ipv6hdr *old_ipv6h = NULL;
951#endif
952
953 ip_vs_drop_early_demux_sk(skb);
954
955 if (skb_headroom(skb) < max_headroom || skb_cloned(skb)) {
956 new_skb = skb_realloc_headroom(skb, max_headroom);
957 if (!new_skb)
958 goto error;
959 if (skb->sk)
960 skb_set_owner_w(new_skb, skb->sk);
961 consume_skb(skb);
962 skb = new_skb;
963 }
964
965#ifdef CONFIG_IP_VS_IPV6
966 if (skb_af == AF_INET6) {
967 old_ipv6h = ipv6_hdr(skb);
968 *next_protocol = IPPROTO_IPV6;
969 if (payload_len)
970 *payload_len =
971 ntohs(old_ipv6h->payload_len) +
972 sizeof(*old_ipv6h);
973 old_dsfield = ipv6_get_dsfield(old_ipv6h);
974 *ttl = old_ipv6h->hop_limit;
975 if (df)
976 *df = 0;
977 } else
978#endif
979 {
980 old_iph = ip_hdr(skb);
981
982 if (df)
983 *df = (old_iph->frag_off & htons(IP_DF));
984 *next_protocol = IPPROTO_IPIP;
985
986
987 ip_send_check(old_iph);
988 old_dsfield = ipv4_get_dsfield(old_iph);
989 *ttl = old_iph->ttl;
990 if (payload_len)
991 *payload_len = ntohs(old_iph->tot_len);
992 }
993
994
995 *dsfield = INET_ECN_encapsulate(old_dsfield, old_dsfield);
996
997 return skb;
998error:
999 kfree_skb(skb);
1000 return ERR_PTR(-ENOMEM);
1001}
1002
1003static inline int __tun_gso_type_mask(int encaps_af, int orig_af)
1004{
1005 switch (encaps_af) {
1006 case AF_INET:
1007 return SKB_GSO_IPXIP4;
1008 case AF_INET6:
1009 return SKB_GSO_IPXIP6;
1010 default:
1011 return 0;
1012 }
1013}
1014
1015static int
1016ipvs_gue_encap(struct net *net, struct sk_buff *skb,
1017 struct ip_vs_conn *cp, __u8 *next_protocol)
1018{
1019 __be16 dport;
1020 __be16 sport = udp_flow_src_port(net, skb, 0, 0, false);
1021 struct udphdr *udph;
1022 struct guehdr *gueh;
1023 size_t hdrlen, optlen = 0;
1024 void *data;
1025 bool need_priv = false;
1026
1027 if ((cp->dest->tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_REMCSUM) &&
1028 skb->ip_summed == CHECKSUM_PARTIAL) {
1029 optlen += GUE_PLEN_REMCSUM + GUE_LEN_PRIV;
1030 need_priv = true;
1031 }
1032
1033 hdrlen = sizeof(struct guehdr) + optlen;
1034
1035 skb_push(skb, hdrlen);
1036
1037 gueh = (struct guehdr *)skb->data;
1038
1039 gueh->control = 0;
1040 gueh->version = 0;
1041 gueh->hlen = optlen >> 2;
1042 gueh->flags = 0;
1043 gueh->proto_ctype = *next_protocol;
1044
1045 data = &gueh[1];
1046
1047 if (need_priv) {
1048 __be32 *flags = data;
1049 u16 csum_start = skb_checksum_start_offset(skb);
1050 __be16 *pd;
1051
1052 gueh->flags |= GUE_FLAG_PRIV;
1053 *flags = 0;
1054 data += GUE_LEN_PRIV;
1055
1056 if (csum_start < hdrlen)
1057 return -EINVAL;
1058
1059 csum_start -= hdrlen;
1060 pd = data;
1061 pd[0] = htons(csum_start);
1062 pd[1] = htons(csum_start + skb->csum_offset);
1063
1064 if (!skb_is_gso(skb)) {
1065 skb->ip_summed = CHECKSUM_NONE;
1066 skb->encapsulation = 0;
1067 }
1068
1069 *flags |= GUE_PFLAG_REMCSUM;
1070 data += GUE_PLEN_REMCSUM;
1071 }
1072
1073 skb_push(skb, sizeof(struct udphdr));
1074 skb_reset_transport_header(skb);
1075
1076 udph = udp_hdr(skb);
1077
1078 dport = cp->dest->tun_port;
1079 udph->dest = dport;
1080 udph->source = sport;
1081 udph->len = htons(skb->len);
1082 udph->check = 0;
1083
1084 *next_protocol = IPPROTO_UDP;
1085
1086 return 0;
1087}
1088
1089static void
1090ipvs_gre_encap(struct net *net, struct sk_buff *skb,
1091 struct ip_vs_conn *cp, __u8 *next_protocol)
1092{
1093 __be16 proto = *next_protocol == IPPROTO_IPIP ?
1094 htons(ETH_P_IP) : htons(ETH_P_IPV6);
1095 __be16 tflags = 0;
1096 size_t hdrlen;
1097
1098 if (cp->dest->tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
1099 tflags |= TUNNEL_CSUM;
1100
1101 hdrlen = gre_calc_hlen(tflags);
1102 gre_build_header(skb, hdrlen, tflags, proto, 0, 0);
1103
1104 *next_protocol = IPPROTO_GRE;
1105}
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126int
1127ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1128 struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
1129{
1130 struct netns_ipvs *ipvs = cp->ipvs;
1131 struct net *net = ipvs->net;
1132 struct rtable *rt;
1133 __be32 saddr;
1134 struct net_device *tdev;
1135 __u8 next_protocol = 0;
1136 __u8 dsfield = 0;
1137 __u8 ttl = 0;
1138 __be16 df = 0;
1139 __be16 *dfp = NULL;
1140 struct iphdr *iph;
1141 unsigned int max_headroom;
1142 int ret, local;
1143 int tun_type, gso_type;
1144 int tun_flags;
1145
1146 EnterFunction(10);
1147
1148 local = __ip_vs_get_out_rt(ipvs, cp->af, skb, cp->dest, cp->daddr.ip,
1149 IP_VS_RT_MODE_LOCAL |
1150 IP_VS_RT_MODE_NON_LOCAL |
1151 IP_VS_RT_MODE_CONNECT |
1152 IP_VS_RT_MODE_TUNNEL, &saddr, ipvsh);
1153 if (local < 0)
1154 goto tx_error;
1155 if (local)
1156 return ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 1);
1157
1158 rt = skb_rtable(skb);
1159 tdev = rt->dst.dev;
1160
1161
1162
1163
1164 max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr);
1165
1166 tun_type = cp->dest->tun_type;
1167 tun_flags = cp->dest->tun_flags;
1168
1169 if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
1170 size_t gue_hdrlen, gue_optlen = 0;
1171
1172 if ((tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_REMCSUM) &&
1173 skb->ip_summed == CHECKSUM_PARTIAL) {
1174 gue_optlen += GUE_PLEN_REMCSUM + GUE_LEN_PRIV;
1175 }
1176 gue_hdrlen = sizeof(struct guehdr) + gue_optlen;
1177
1178 max_headroom += sizeof(struct udphdr) + gue_hdrlen;
1179 } else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
1180 size_t gre_hdrlen;
1181 __be16 tflags = 0;
1182
1183 if (tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
1184 tflags |= TUNNEL_CSUM;
1185 gre_hdrlen = gre_calc_hlen(tflags);
1186
1187 max_headroom += gre_hdrlen;
1188 }
1189
1190
1191 dfp = sysctl_pmtu_disc(ipvs) ? &df : NULL;
1192 skb = ip_vs_prepare_tunneled_skb(skb, cp->af, max_headroom,
1193 &next_protocol, NULL, &dsfield,
1194 &ttl, dfp);
1195 if (IS_ERR(skb))
1196 goto tx_error;
1197
1198 gso_type = __tun_gso_type_mask(AF_INET, cp->af);
1199 if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
1200 if ((tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM) ||
1201 (tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_REMCSUM))
1202 gso_type |= SKB_GSO_UDP_TUNNEL_CSUM;
1203 else
1204 gso_type |= SKB_GSO_UDP_TUNNEL;
1205 if ((tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_REMCSUM) &&
1206 skb->ip_summed == CHECKSUM_PARTIAL) {
1207 gso_type |= SKB_GSO_TUNNEL_REMCSUM;
1208 }
1209 } else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
1210 if (tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
1211 gso_type |= SKB_GSO_GRE_CSUM;
1212 else
1213 gso_type |= SKB_GSO_GRE;
1214 }
1215
1216 if (iptunnel_handle_offloads(skb, gso_type))
1217 goto tx_error;
1218
1219 skb->transport_header = skb->network_header;
1220
1221 skb_set_inner_ipproto(skb, next_protocol);
1222
1223 if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
1224 bool check = false;
1225
1226 if (ipvs_gue_encap(net, skb, cp, &next_protocol))
1227 goto tx_error;
1228
1229 if ((tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM) ||
1230 (tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_REMCSUM))
1231 check = true;
1232
1233 udp_set_csum(!check, skb, saddr, cp->daddr.ip, skb->len);
1234 } else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE)
1235 ipvs_gre_encap(net, skb, cp, &next_protocol);
1236
1237 skb_push(skb, sizeof(struct iphdr));
1238 skb_reset_network_header(skb);
1239 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1240
1241
1242
1243
1244 iph = ip_hdr(skb);
1245 iph->version = 4;
1246 iph->ihl = sizeof(struct iphdr)>>2;
1247 iph->frag_off = df;
1248 iph->protocol = next_protocol;
1249 iph->tos = dsfield;
1250 iph->daddr = cp->daddr.ip;
1251 iph->saddr = saddr;
1252 iph->ttl = ttl;
1253 ip_select_ident(net, skb, NULL);
1254
1255
1256 skb->ignore_df = 1;
1257
1258 ret = ip_vs_tunnel_xmit_prepare(skb, cp);
1259 if (ret == NF_ACCEPT)
1260 ip_local_out(net, skb->sk, skb);
1261 else if (ret == NF_DROP)
1262 kfree_skb(skb);
1263
1264 LeaveFunction(10);
1265
1266 return NF_STOLEN;
1267
1268 tx_error:
1269 if (!IS_ERR(skb))
1270 kfree_skb(skb);
1271 LeaveFunction(10);
1272 return NF_STOLEN;
1273}
1274
1275#ifdef CONFIG_IP_VS_IPV6
1276int
1277ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1278 struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
1279{
1280 struct netns_ipvs *ipvs = cp->ipvs;
1281 struct net *net = ipvs->net;
1282 struct rt6_info *rt;
1283 struct in6_addr saddr;
1284 struct net_device *tdev;
1285 __u8 next_protocol = 0;
1286 __u32 payload_len = 0;
1287 __u8 dsfield = 0;
1288 __u8 ttl = 0;
1289 struct ipv6hdr *iph;
1290 unsigned int max_headroom;
1291 int ret, local;
1292 int tun_type, gso_type;
1293 int tun_flags;
1294
1295 EnterFunction(10);
1296
1297 local = __ip_vs_get_out_rt_v6(ipvs, cp->af, skb, cp->dest,
1298 &cp->daddr.in6,
1299 &saddr, ipvsh, 1,
1300 IP_VS_RT_MODE_LOCAL |
1301 IP_VS_RT_MODE_NON_LOCAL |
1302 IP_VS_RT_MODE_TUNNEL);
1303 if (local < 0)
1304 goto tx_error;
1305 if (local)
1306 return ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 1);
1307
1308 rt = (struct rt6_info *) skb_dst(skb);
1309 tdev = rt->dst.dev;
1310
1311
1312
1313
1314 max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct ipv6hdr);
1315
1316 tun_type = cp->dest->tun_type;
1317 tun_flags = cp->dest->tun_flags;
1318
1319 if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
1320 size_t gue_hdrlen, gue_optlen = 0;
1321
1322 if ((tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_REMCSUM) &&
1323 skb->ip_summed == CHECKSUM_PARTIAL) {
1324 gue_optlen += GUE_PLEN_REMCSUM + GUE_LEN_PRIV;
1325 }
1326 gue_hdrlen = sizeof(struct guehdr) + gue_optlen;
1327
1328 max_headroom += sizeof(struct udphdr) + gue_hdrlen;
1329 } else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
1330 size_t gre_hdrlen;
1331 __be16 tflags = 0;
1332
1333 if (tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
1334 tflags |= TUNNEL_CSUM;
1335 gre_hdrlen = gre_calc_hlen(tflags);
1336
1337 max_headroom += gre_hdrlen;
1338 }
1339
1340 skb = ip_vs_prepare_tunneled_skb(skb, cp->af, max_headroom,
1341 &next_protocol, &payload_len,
1342 &dsfield, &ttl, NULL);
1343 if (IS_ERR(skb))
1344 goto tx_error;
1345
1346 gso_type = __tun_gso_type_mask(AF_INET6, cp->af);
1347 if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
1348 if ((tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM) ||
1349 (tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_REMCSUM))
1350 gso_type |= SKB_GSO_UDP_TUNNEL_CSUM;
1351 else
1352 gso_type |= SKB_GSO_UDP_TUNNEL;
1353 if ((tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_REMCSUM) &&
1354 skb->ip_summed == CHECKSUM_PARTIAL) {
1355 gso_type |= SKB_GSO_TUNNEL_REMCSUM;
1356 }
1357 } else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
1358 if (tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
1359 gso_type |= SKB_GSO_GRE_CSUM;
1360 else
1361 gso_type |= SKB_GSO_GRE;
1362 }
1363
1364 if (iptunnel_handle_offloads(skb, gso_type))
1365 goto tx_error;
1366
1367 skb->transport_header = skb->network_header;
1368
1369 skb_set_inner_ipproto(skb, next_protocol);
1370
1371 if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
1372 bool check = false;
1373
1374 if (ipvs_gue_encap(net, skb, cp, &next_protocol))
1375 goto tx_error;
1376
1377 if ((tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM) ||
1378 (tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_REMCSUM))
1379 check = true;
1380
1381 udp6_set_csum(!check, skb, &saddr, &cp->daddr.in6, skb->len);
1382 } else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE)
1383 ipvs_gre_encap(net, skb, cp, &next_protocol);
1384
1385 skb_push(skb, sizeof(struct ipv6hdr));
1386 skb_reset_network_header(skb);
1387 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1388
1389
1390
1391
1392 iph = ipv6_hdr(skb);
1393 iph->version = 6;
1394 iph->nexthdr = next_protocol;
1395 iph->payload_len = htons(payload_len);
1396 memset(&iph->flow_lbl, 0, sizeof(iph->flow_lbl));
1397 ipv6_change_dsfield(iph, 0, dsfield);
1398 iph->daddr = cp->daddr.in6;
1399 iph->saddr = saddr;
1400 iph->hop_limit = ttl;
1401
1402
1403 skb->ignore_df = 1;
1404
1405 ret = ip_vs_tunnel_xmit_prepare(skb, cp);
1406 if (ret == NF_ACCEPT)
1407 ip6_local_out(net, skb->sk, skb);
1408 else if (ret == NF_DROP)
1409 kfree_skb(skb);
1410
1411 LeaveFunction(10);
1412
1413 return NF_STOLEN;
1414
1415tx_error:
1416 if (!IS_ERR(skb))
1417 kfree_skb(skb);
1418 LeaveFunction(10);
1419 return NF_STOLEN;
1420}
1421#endif
1422
1423
1424
1425
1426
1427
1428int
1429ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1430 struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
1431{
1432 int local;
1433
1434 EnterFunction(10);
1435
1436 local = __ip_vs_get_out_rt(cp->ipvs, cp->af, skb, cp->dest, cp->daddr.ip,
1437 IP_VS_RT_MODE_LOCAL |
1438 IP_VS_RT_MODE_NON_LOCAL |
1439 IP_VS_RT_MODE_KNOWN_NH, NULL, ipvsh);
1440 if (local < 0)
1441 goto tx_error;
1442 if (local)
1443 return ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 1);
1444
1445 ip_send_check(ip_hdr(skb));
1446
1447
1448 skb->ignore_df = 1;
1449
1450 ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 0);
1451
1452 LeaveFunction(10);
1453 return NF_STOLEN;
1454
1455 tx_error:
1456 kfree_skb(skb);
1457 LeaveFunction(10);
1458 return NF_STOLEN;
1459}
1460
1461#ifdef CONFIG_IP_VS_IPV6
1462int
1463ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1464 struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
1465{
1466 int local;
1467
1468 EnterFunction(10);
1469
1470 local = __ip_vs_get_out_rt_v6(cp->ipvs, cp->af, skb, cp->dest,
1471 &cp->daddr.in6,
1472 NULL, ipvsh, 0,
1473 IP_VS_RT_MODE_LOCAL |
1474 IP_VS_RT_MODE_NON_LOCAL |
1475 IP_VS_RT_MODE_KNOWN_NH);
1476 if (local < 0)
1477 goto tx_error;
1478 if (local)
1479 return ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 1);
1480
1481
1482 skb->ignore_df = 1;
1483
1484 ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 0);
1485
1486 LeaveFunction(10);
1487 return NF_STOLEN;
1488
1489tx_error:
1490 kfree_skb(skb);
1491 LeaveFunction(10);
1492 return NF_STOLEN;
1493}
1494#endif
1495
1496
1497
1498
1499
1500
1501int
1502ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1503 struct ip_vs_protocol *pp, int offset, unsigned int hooknum,
1504 struct ip_vs_iphdr *iph)
1505{
1506 struct rtable *rt;
1507 int rc;
1508 int local;
1509 int rt_mode, was_input;
1510
1511 EnterFunction(10);
1512
1513
1514
1515
1516 if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) {
1517 if (cp->packet_xmit)
1518 rc = cp->packet_xmit(skb, cp, pp, iph);
1519 else
1520 rc = NF_ACCEPT;
1521
1522 atomic_inc(&cp->in_pkts);
1523 goto out;
1524 }
1525
1526
1527
1528
1529 was_input = rt_is_input_route(skb_rtable(skb));
1530
1531
1532 rt_mode = (hooknum != NF_INET_FORWARD) ?
1533 IP_VS_RT_MODE_LOCAL | IP_VS_RT_MODE_NON_LOCAL |
1534 IP_VS_RT_MODE_RDR : IP_VS_RT_MODE_NON_LOCAL;
1535 local = __ip_vs_get_out_rt(cp->ipvs, cp->af, skb, cp->dest, cp->daddr.ip, rt_mode,
1536 NULL, iph);
1537 if (local < 0)
1538 goto tx_error;
1539 rt = skb_rtable(skb);
1540
1541
1542
1543
1544
1545#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1546 if (cp->flags & IP_VS_CONN_F_SYNC && local) {
1547 enum ip_conntrack_info ctinfo;
1548 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1549
1550 if (ct) {
1551 IP_VS_DBG(10, "%s(): "
1552 "stopping DNAT to local address %pI4\n",
1553 __func__, &cp->daddr.ip);
1554 goto tx_error;
1555 }
1556 }
1557#endif
1558
1559
1560 if (local && ipv4_is_loopback(cp->daddr.ip) && was_input) {
1561 IP_VS_DBG(1, "%s(): "
1562 "stopping DNAT to loopback %pI4\n",
1563 __func__, &cp->daddr.ip);
1564 goto tx_error;
1565 }
1566
1567
1568 if (skb_ensure_writable(skb, offset))
1569 goto tx_error;
1570
1571 if (skb_cow(skb, rt->dst.dev->hard_header_len))
1572 goto tx_error;
1573
1574 ip_vs_nat_icmp(skb, pp, cp, 0);
1575
1576
1577 skb->ignore_df = 1;
1578
1579 rc = ip_vs_nat_send_or_cont(NFPROTO_IPV4, skb, cp, local);
1580 goto out;
1581
1582 tx_error:
1583 kfree_skb(skb);
1584 rc = NF_STOLEN;
1585 out:
1586 LeaveFunction(10);
1587 return rc;
1588}
1589
1590#ifdef CONFIG_IP_VS_IPV6
1591int
1592ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1593 struct ip_vs_protocol *pp, int offset, unsigned int hooknum,
1594 struct ip_vs_iphdr *ipvsh)
1595{
1596 struct rt6_info *rt;
1597 int rc;
1598 int local;
1599 int rt_mode;
1600
1601 EnterFunction(10);
1602
1603
1604
1605
1606 if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) {
1607 if (cp->packet_xmit)
1608 rc = cp->packet_xmit(skb, cp, pp, ipvsh);
1609 else
1610 rc = NF_ACCEPT;
1611
1612 atomic_inc(&cp->in_pkts);
1613 goto out;
1614 }
1615
1616
1617
1618
1619
1620
1621 rt_mode = (hooknum != NF_INET_FORWARD) ?
1622 IP_VS_RT_MODE_LOCAL | IP_VS_RT_MODE_NON_LOCAL |
1623 IP_VS_RT_MODE_RDR : IP_VS_RT_MODE_NON_LOCAL;
1624 local = __ip_vs_get_out_rt_v6(cp->ipvs, cp->af, skb, cp->dest,
1625 &cp->daddr.in6, NULL, ipvsh, 0, rt_mode);
1626 if (local < 0)
1627 goto tx_error;
1628 rt = (struct rt6_info *) skb_dst(skb);
1629
1630
1631
1632
1633#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1634 if (cp->flags & IP_VS_CONN_F_SYNC && local) {
1635 enum ip_conntrack_info ctinfo;
1636 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1637
1638 if (ct) {
1639 IP_VS_DBG(10, "%s(): "
1640 "stopping DNAT to local address %pI6\n",
1641 __func__, &cp->daddr.in6);
1642 goto tx_error;
1643 }
1644 }
1645#endif
1646
1647
1648 if (local && skb->dev && !(skb->dev->flags & IFF_LOOPBACK) &&
1649 ipv6_addr_type(&cp->daddr.in6) & IPV6_ADDR_LOOPBACK) {
1650 IP_VS_DBG(1, "%s(): "
1651 "stopping DNAT to loopback %pI6\n",
1652 __func__, &cp->daddr.in6);
1653 goto tx_error;
1654 }
1655
1656
1657 if (skb_ensure_writable(skb, offset))
1658 goto tx_error;
1659
1660 if (skb_cow(skb, rt->dst.dev->hard_header_len))
1661 goto tx_error;
1662
1663 ip_vs_nat_icmp_v6(skb, pp, cp, 0);
1664
1665
1666 skb->ignore_df = 1;
1667
1668 rc = ip_vs_nat_send_or_cont(NFPROTO_IPV6, skb, cp, local);
1669 goto out;
1670
1671tx_error:
1672 kfree_skb(skb);
1673 rc = NF_STOLEN;
1674out:
1675 LeaveFunction(10);
1676 return rc;
1677}
1678#endif
1679
