1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * xfrm_output.c - Common IPsec encapsulation code.
5 * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
8 #include <linux/errno.h>
9 #include <linux/module.h>
10 #include <linux/netdevice.h>
11 #include <linux/netfilter.h>
12 #include <linux/skbuff.h>
13 #include <linux/slab.h>
14 #include <linux/spinlock.h>
17 #include <net/inet_ecn.h>
20 #if IS_ENABLED(CONFIG_IPV6)
21 #include <net/ip6_route.h>
22 #include <net/ipv6_stubs.h>
25 #include "xfrm_inout.h"
27 static int xfrm_output2(struct net *net, struct sock *sk, struct sk_buff *skb);
28 static int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
30 static int xfrm_skb_check_space(struct sk_buff *skb)
32 struct dst_entry *dst = skb_dst(skb);
33 int nhead = dst->header_len + LL_RESERVED_SPACE(dst->dev)
35 int ntail = dst->dev->needed_tailroom - skb_tailroom(skb);
44 return pskb_expand_head(skb, nhead, ntail, GFP_ATOMIC);
47 /* Children define the path of the packet through the
48 * Linux networking. Thus, destinations are stackable.
51 static struct dst_entry *skb_dst_pop(struct sk_buff *skb)
53 struct dst_entry *child = dst_clone(xfrm_dst_child(skb_dst(skb)));
59 /* Add encapsulation header.
61 * The IP header will be moved forward to make space for the encapsulation
64 static int xfrm4_transport_output(struct xfrm_state *x, struct sk_buff *skb)
66 struct iphdr *iph = ip_hdr(skb);
67 int ihl = iph->ihl * 4;
69 skb_set_inner_transport_header(skb, skb_transport_offset(skb));
71 skb_set_network_header(skb, -x->props.header_len);
72 skb->mac_header = skb->network_header +
73 offsetof(struct iphdr, protocol);
74 skb->transport_header = skb->network_header + ihl;
76 memmove(skb_network_header(skb), iph, ihl);
80 #if IS_ENABLED(CONFIG_IPV6_MIP6)
81 static int mip6_rthdr_offset(struct sk_buff *skb, u8 **nexthdr, int type)
83 const unsigned char *nh = skb_network_header(skb);
84 unsigned int offset = sizeof(struct ipv6hdr);
85 unsigned int packet_len;
88 packet_len = skb_tail_pointer(skb) - nh;
89 *nexthdr = &ipv6_hdr(skb)->nexthdr;
91 while (offset <= packet_len) {
92 struct ipv6_opt_hdr *exthdr;
98 if (type == IPPROTO_ROUTING && offset + 3 <= packet_len) {
99 struct ipv6_rt_hdr *rt;
101 rt = (struct ipv6_rt_hdr *)(nh + offset);
108 /* HAO MUST NOT appear more than once.
109 * XXX: It is better to try to find by the end of
110 * XXX: packet if HAO exists.
112 if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) {
113 net_dbg_ratelimited("mip6: hao exists already, override\n");
125 if (offset + sizeof(struct ipv6_opt_hdr) > packet_len)
128 exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
130 offset += ipv6_optlen(exthdr);
131 if (offset > IPV6_MAXPLEN)
133 *nexthdr = &exthdr->nexthdr;
140 #if IS_ENABLED(CONFIG_IPV6)
141 static int xfrm6_hdr_offset(struct xfrm_state *x, struct sk_buff *skb, u8 **prevhdr)
143 switch (x->type->proto) {
144 #if IS_ENABLED(CONFIG_IPV6_MIP6)
145 case IPPROTO_DSTOPTS:
146 case IPPROTO_ROUTING:
147 return mip6_rthdr_offset(skb, prevhdr, x->type->proto);
153 return ip6_find_1stfragopt(skb, prevhdr);
157 /* Add encapsulation header.
159 * The IP header and mutable extension headers will be moved forward to make
160 * space for the encapsulation header.
162 static int xfrm6_transport_output(struct xfrm_state *x, struct sk_buff *skb)
164 #if IS_ENABLED(CONFIG_IPV6)
170 skb_set_inner_transport_header(skb, skb_transport_offset(skb));
172 hdr_len = xfrm6_hdr_offset(x, skb, &prevhdr);
175 skb_set_mac_header(skb,
176 (prevhdr - x->props.header_len) - skb->data);
177 skb_set_network_header(skb, -x->props.header_len);
178 skb->transport_header = skb->network_header + hdr_len;
179 __skb_pull(skb, hdr_len);
180 memmove(ipv6_hdr(skb), iph, hdr_len);
184 return -EAFNOSUPPORT;
188 /* Add route optimization header space.
190 * The IP header and mutable extension headers will be moved forward to make
191 * space for the route optimization header.
193 static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
195 #if IS_ENABLED(CONFIG_IPV6)
202 hdr_len = xfrm6_hdr_offset(x, skb, &prevhdr);
205 skb_set_mac_header(skb,
206 (prevhdr - x->props.header_len) - skb->data);
207 skb_set_network_header(skb, -x->props.header_len);
208 skb->transport_header = skb->network_header + hdr_len;
209 __skb_pull(skb, hdr_len);
210 memmove(ipv6_hdr(skb), iph, hdr_len);
212 x->lastused = ktime_get_real_seconds();
217 return -EAFNOSUPPORT;
221 /* Add encapsulation header.
223 * The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt.
225 static int xfrm4_beet_encap_add(struct xfrm_state *x, struct sk_buff *skb)
227 struct ip_beet_phdr *ph;
228 struct iphdr *top_iph;
232 optlen = XFRM_MODE_SKB_CB(skb)->optlen;
233 if (unlikely(optlen))
234 hdrlen += IPV4_BEET_PHMAXLEN - (optlen & 4);
236 skb_set_network_header(skb, -x->props.header_len - hdrlen +
237 (XFRM_MODE_SKB_CB(skb)->ihl - sizeof(*top_iph)));
238 if (x->sel.family != AF_INET6)
239 skb->network_header += IPV4_BEET_PHMAXLEN;
240 skb->mac_header = skb->network_header +
241 offsetof(struct iphdr, protocol);
242 skb->transport_header = skb->network_header + sizeof(*top_iph);
244 xfrm4_beet_make_header(skb);
246 ph = __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdrlen);
248 top_iph = ip_hdr(skb);
250 if (unlikely(optlen)) {
251 if (WARN_ON(optlen < 0))
254 ph->padlen = 4 - (optlen & 4);
255 ph->hdrlen = optlen / 8;
256 ph->nexthdr = top_iph->protocol;
258 memset(ph + 1, IPOPT_NOP, ph->padlen);
260 top_iph->protocol = IPPROTO_BEETPH;
261 top_iph->ihl = sizeof(struct iphdr) / 4;
264 top_iph->saddr = x->props.saddr.a4;
265 top_iph->daddr = x->id.daddr.a4;
270 /* Add encapsulation header.
272 * The top IP header will be constructed per RFC 2401.
274 static int xfrm4_tunnel_encap_add(struct xfrm_state *x, struct sk_buff *skb)
276 bool small_ipv6 = (skb->protocol == htons(ETH_P_IPV6)) && (skb->len <= IPV6_MIN_MTU);
277 struct dst_entry *dst = skb_dst(skb);
278 struct iphdr *top_iph;
281 skb_set_inner_network_header(skb, skb_network_offset(skb));
282 skb_set_inner_transport_header(skb, skb_transport_offset(skb));
284 skb_set_network_header(skb, -x->props.header_len);
285 skb->mac_header = skb->network_header +
286 offsetof(struct iphdr, protocol);
287 skb->transport_header = skb->network_header + sizeof(*top_iph);
288 top_iph = ip_hdr(skb);
291 top_iph->version = 4;
293 top_iph->protocol = xfrm_af2proto(skb_dst(skb)->ops->family);
295 /* DS disclosing depends on XFRM_SA_XFLAG_DONT_ENCAP_DSCP */
296 if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP)
299 top_iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
300 top_iph->tos = INET_ECN_encapsulate(top_iph->tos,
301 XFRM_MODE_SKB_CB(skb)->tos);
303 flags = x->props.flags;
304 if (flags & XFRM_STATE_NOECN)
305 IP_ECN_clear(top_iph);
307 top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) || small_ipv6 ?
308 0 : (XFRM_MODE_SKB_CB(skb)->frag_off & htons(IP_DF));
310 top_iph->ttl = ip4_dst_hoplimit(xfrm_dst_child(dst));
312 top_iph->saddr = x->props.saddr.a4;
313 top_iph->daddr = x->id.daddr.a4;
314 ip_select_ident(dev_net(dst->dev), skb, NULL);
319 #if IS_ENABLED(CONFIG_IPV6)
320 static int xfrm6_tunnel_encap_add(struct xfrm_state *x, struct sk_buff *skb)
322 struct dst_entry *dst = skb_dst(skb);
323 struct ipv6hdr *top_iph;
326 skb_set_inner_network_header(skb, skb_network_offset(skb));
327 skb_set_inner_transport_header(skb, skb_transport_offset(skb));
329 skb_set_network_header(skb, -x->props.header_len);
330 skb->mac_header = skb->network_header +
331 offsetof(struct ipv6hdr, nexthdr);
332 skb->transport_header = skb->network_header + sizeof(*top_iph);
333 top_iph = ipv6_hdr(skb);
335 top_iph->version = 6;
337 memcpy(top_iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
338 sizeof(top_iph->flow_lbl));
339 top_iph->nexthdr = xfrm_af2proto(skb_dst(skb)->ops->family);
341 if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP)
344 dsfield = XFRM_MODE_SKB_CB(skb)->tos;
345 dsfield = INET_ECN_encapsulate(dsfield, XFRM_MODE_SKB_CB(skb)->tos);
346 if (x->props.flags & XFRM_STATE_NOECN)
347 dsfield &= ~INET_ECN_MASK;
348 ipv6_change_dsfield(top_iph, 0, dsfield);
349 top_iph->hop_limit = ip6_dst_hoplimit(xfrm_dst_child(dst));
350 top_iph->saddr = *(struct in6_addr *)&x->props.saddr;
351 top_iph->daddr = *(struct in6_addr *)&x->id.daddr;
355 static int xfrm6_beet_encap_add(struct xfrm_state *x, struct sk_buff *skb)
357 struct ipv6hdr *top_iph;
358 struct ip_beet_phdr *ph;
362 optlen = XFRM_MODE_SKB_CB(skb)->optlen;
363 if (unlikely(optlen))
364 hdr_len += IPV4_BEET_PHMAXLEN - (optlen & 4);
366 skb_set_network_header(skb, -x->props.header_len - hdr_len);
367 if (x->sel.family != AF_INET6)
368 skb->network_header += IPV4_BEET_PHMAXLEN;
369 skb->mac_header = skb->network_header +
370 offsetof(struct ipv6hdr, nexthdr);
371 skb->transport_header = skb->network_header + sizeof(*top_iph);
372 ph = __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdr_len);
374 xfrm6_beet_make_header(skb);
376 top_iph = ipv6_hdr(skb);
377 if (unlikely(optlen)) {
378 if (WARN_ON(optlen < 0))
381 ph->padlen = 4 - (optlen & 4);
382 ph->hdrlen = optlen / 8;
383 ph->nexthdr = top_iph->nexthdr;
385 memset(ph + 1, IPOPT_NOP, ph->padlen);
387 top_iph->nexthdr = IPPROTO_BEETPH;
390 top_iph->saddr = *(struct in6_addr *)&x->props.saddr;
391 top_iph->daddr = *(struct in6_addr *)&x->id.daddr;
396 /* Add encapsulation header.
398 * On exit, the transport header will be set to the start of the
399 * encapsulation header to be filled in by x->type->output and the mac
400 * header will be set to the nextheader (protocol for IPv4) field of the
401 * extension header directly preceding the encapsulation header, or in
402 * its absence, that of the top IP header.
403 * The value of the network header will always point to the top IP header
404 * while skb->data will point to the payload.
406 static int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
410 err = xfrm_inner_extract_output(x, skb);
414 IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE;
415 skb->protocol = htons(ETH_P_IP);
417 switch (x->outer_mode.encap) {
419 return xfrm4_beet_encap_add(x, skb);
420 case XFRM_MODE_TUNNEL:
421 return xfrm4_tunnel_encap_add(x, skb);
428 static int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
430 #if IS_ENABLED(CONFIG_IPV6)
433 err = xfrm_inner_extract_output(x, skb);
438 skb->protocol = htons(ETH_P_IPV6);
440 switch (x->outer_mode.encap) {
442 return xfrm6_beet_encap_add(x, skb);
443 case XFRM_MODE_TUNNEL:
444 return xfrm6_tunnel_encap_add(x, skb);
451 return -EAFNOSUPPORT;
454 static int xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb)
456 switch (x->outer_mode.encap) {
458 case XFRM_MODE_TUNNEL:
459 if (x->outer_mode.family == AF_INET)
460 return xfrm4_prepare_output(x, skb);
461 if (x->outer_mode.family == AF_INET6)
462 return xfrm6_prepare_output(x, skb);
464 case XFRM_MODE_TRANSPORT:
465 if (x->outer_mode.family == AF_INET)
466 return xfrm4_transport_output(x, skb);
467 if (x->outer_mode.family == AF_INET6)
468 return xfrm6_transport_output(x, skb);
470 case XFRM_MODE_ROUTEOPTIMIZATION:
471 if (x->outer_mode.family == AF_INET6)
472 return xfrm6_ro_output(x, skb);
483 #if IS_ENABLED(CONFIG_NET_PKTGEN)
484 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb)
486 return xfrm_outer_mode_output(x, skb);
488 EXPORT_SYMBOL_GPL(pktgen_xfrm_outer_mode_output);
491 static int xfrm_output_one(struct sk_buff *skb, int err)
493 struct dst_entry *dst = skb_dst(skb);
494 struct xfrm_state *x = dst->xfrm;
495 struct net *net = xs_net(x);
501 err = xfrm_skb_check_space(skb);
503 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
507 skb->mark = xfrm_smark_get(skb->mark, x);
509 err = xfrm_outer_mode_output(x, skb);
511 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR);
515 spin_lock_bh(&x->lock);
517 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
518 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEINVALID);
523 err = xfrm_state_check_expire(x);
525 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEEXPIRED);
529 err = xfrm_replay_overflow(x, skb);
531 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATESEQERROR);
535 x->curlft.bytes += skb->len;
537 x->curlft.use_time = ktime_get_real_seconds();
539 spin_unlock_bh(&x->lock);
543 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
548 if (xfrm_offload(skb)) {
549 x->type_offload->encap(x, skb);
551 /* Inner headers are invalid now. */
552 skb->encapsulation = 0;
554 err = x->type->output(x, skb);
555 if (err == -EINPROGRESS)
561 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR);
565 dst = skb_dst_pop(skb);
567 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
571 skb_dst_set(skb, dst);
573 } while (x && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL));
578 spin_unlock_bh(&x->lock);
585 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err)
587 struct net *net = xs_net(skb_dst(skb)->xfrm);
589 while (likely((err = xfrm_output_one(skb, err)) == 0)) {
592 err = skb_dst(skb)->ops->local_out(net, sk, skb);
593 if (unlikely(err != 1))
596 if (!skb_dst(skb)->xfrm)
597 return dst_output(net, sk, skb);
599 err = nf_hook(skb_dst(skb)->ops->family,
600 NF_INET_POST_ROUTING, net, sk, skb,
601 NULL, skb_dst(skb)->dev, xfrm_output2);
602 if (unlikely(err != 1))
606 if (err == -EINPROGRESS)
612 EXPORT_SYMBOL_GPL(xfrm_output_resume);
614 static int xfrm_output2(struct net *net, struct sock *sk, struct sk_buff *skb)
616 return xfrm_output_resume(sk, skb, 1);
619 static int xfrm_output_gso(struct net *net, struct sock *sk, struct sk_buff *skb)
621 struct sk_buff *segs, *nskb;
623 BUILD_BUG_ON(sizeof(*IPCB(skb)) > SKB_GSO_CB_OFFSET);
624 BUILD_BUG_ON(sizeof(*IP6CB(skb)) > SKB_GSO_CB_OFFSET);
625 segs = skb_gso_segment(skb, 0);
628 return PTR_ERR(segs);
632 skb_list_walk_safe(segs, segs, nskb) {
635 skb_mark_not_on_list(segs);
636 err = xfrm_output2(net, sk, segs);
639 kfree_skb_list(nskb);
647 /* For partial checksum offload, the outer header checksum is calculated
648 * by software and the inner header checksum is calculated by hardware.
649 * This requires hardware to know the inner packet type to calculate
650 * the inner header checksum. Save inner ip protocol here to avoid
651 * traversing the packet in the vendor's xmit code.
652 * For IPsec tunnel mode save the ip protocol from the IP header of the
653 * plain text packet. Otherwise If the encap type is IPIP, just save
654 * skb->inner_ipproto in any other case get the ip protocol from the IP
657 static void xfrm_get_inner_ipproto(struct sk_buff *skb, struct xfrm_state *x)
659 struct xfrm_offload *xo = xfrm_offload(skb);
660 const struct ethhdr *eth;
665 if (x->outer_mode.encap == XFRM_MODE_TUNNEL) {
666 switch (x->outer_mode.family) {
668 xo->inner_ipproto = ip_hdr(skb)->protocol;
671 xo->inner_ipproto = ipv6_hdr(skb)->nexthdr;
680 /* non-Tunnel Mode */
681 if (!skb->encapsulation)
684 if (skb->inner_protocol_type == ENCAP_TYPE_IPPROTO) {
685 xo->inner_ipproto = skb->inner_ipproto;
689 if (skb->inner_protocol_type != ENCAP_TYPE_ETHER)
692 eth = (struct ethhdr *)skb_inner_mac_header(skb);
694 switch (ntohs(eth->h_proto)) {
696 xo->inner_ipproto = inner_ipv6_hdr(skb)->nexthdr;
699 xo->inner_ipproto = inner_ip_hdr(skb)->protocol;
704 int xfrm_output(struct sock *sk, struct sk_buff *skb)
706 struct net *net = dev_net(skb_dst(skb)->dev);
707 struct xfrm_state *x = skb_dst(skb)->xfrm;
710 switch (x->outer_mode.family) {
712 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
713 IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
716 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
718 IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
724 if (xfrm_dev_offload_ok(skb, x)) {
727 sp = secpath_set(skb);
729 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
735 sp->xvec[sp->len++] = x;
738 xfrm_get_inner_ipproto(skb, x);
739 skb->encapsulation = 1;
741 if (skb_is_gso(skb)) {
742 if (skb->inner_protocol)
743 return xfrm_output_gso(net, sk, skb);
745 skb_shinfo(skb)->gso_type |= SKB_GSO_ESP;
749 if (x->xso.dev && x->xso.dev->features & NETIF_F_HW_ESP_TX_CSUM)
753 return xfrm_output_gso(net, sk, skb);
756 if (skb->ip_summed == CHECKSUM_PARTIAL) {
757 err = skb_checksum_help(skb);
759 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
766 return xfrm_output2(net, sk, skb);
768 EXPORT_SYMBOL_GPL(xfrm_output);
770 static int xfrm4_tunnel_check_size(struct sk_buff *skb)
774 if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE)
777 if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->ignore_df)
780 mtu = dst_mtu(skb_dst(skb));
781 if ((!skb_is_gso(skb) && skb->len > mtu) ||
783 !skb_gso_validate_network_len(skb, ip_skb_dst_mtu(skb->sk, skb)))) {
784 skb->protocol = htons(ETH_P_IP);
787 xfrm_local_error(skb, mtu);
789 icmp_send(skb, ICMP_DEST_UNREACH,
790 ICMP_FRAG_NEEDED, htonl(mtu));
797 static int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb)
801 if (x->outer_mode.encap == XFRM_MODE_BEET &&
802 ip_is_fragment(ip_hdr(skb))) {
803 net_warn_ratelimited("BEET mode doesn't support inner IPv4 fragments\n");
804 return -EAFNOSUPPORT;
807 err = xfrm4_tunnel_check_size(skb);
811 XFRM_MODE_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol;
813 xfrm4_extract_header(skb);
817 #if IS_ENABLED(CONFIG_IPV6)
818 static int xfrm6_tunnel_check_size(struct sk_buff *skb)
821 struct dst_entry *dst = skb_dst(skb);
827 if (mtu < IPV6_MIN_MTU)
830 if ((!skb_is_gso(skb) && skb->len > mtu) ||
832 !skb_gso_validate_network_len(skb, ip6_skb_dst_mtu(skb)))) {
834 skb->protocol = htons(ETH_P_IPV6);
836 if (xfrm6_local_dontfrag(skb->sk))
837 ipv6_stub->xfrm6_local_rxpmtu(skb, mtu);
839 xfrm_local_error(skb, mtu);
841 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
849 static int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb)
851 #if IS_ENABLED(CONFIG_IPV6)
854 err = xfrm6_tunnel_check_size(skb);
858 XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr;
860 xfrm6_extract_header(skb);
864 return -EAFNOSUPPORT;
868 static int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb)
870 const struct xfrm_mode *inner_mode;
872 if (x->sel.family == AF_UNSPEC)
873 inner_mode = xfrm_ip2inner_mode(x,
874 xfrm_af2proto(skb_dst(skb)->ops->family));
876 inner_mode = &x->inner_mode;
878 if (inner_mode == NULL)
879 return -EAFNOSUPPORT;
881 switch (inner_mode->family) {
883 return xfrm4_extract_output(x, skb);
885 return xfrm6_extract_output(x, skb);
888 return -EAFNOSUPPORT;
891 void xfrm_local_error(struct sk_buff *skb, int mtu)
894 struct xfrm_state_afinfo *afinfo;
896 if (skb->protocol == htons(ETH_P_IP))
898 else if (skb->protocol == htons(ETH_P_IPV6) &&
899 skb->sk->sk_family == AF_INET6)
904 afinfo = xfrm_state_get_afinfo(proto);
906 afinfo->local_error(skb, mtu);
910 EXPORT_SYMBOL_GPL(xfrm_local_error);