Lines Matching refs:skb
28 static int xfrm_output2(struct net *net, struct sock *sk, struct sk_buff *skb);
29 static int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
31 static int xfrm_skb_check_space(struct sk_buff *skb)
33 struct dst_entry *dst = skb_dst(skb);
35 - skb_headroom(skb);
36 int ntail = dst->dev->needed_tailroom - skb_tailroom(skb);
45 return pskb_expand_head(skb, nhead, ntail, GFP_ATOMIC);
52 static struct dst_entry *skb_dst_pop(struct sk_buff *skb)
54 struct dst_entry *child = dst_clone(xfrm_dst_child(skb_dst(skb)));
56 skb_dst_drop(skb);
65 static int xfrm4_transport_output(struct xfrm_state *x, struct sk_buff *skb)
67 struct iphdr *iph = ip_hdr(skb);
70 skb_set_inner_transport_header(skb, skb_transport_offset(skb));
72 skb_set_network_header(skb, -x->props.header_len);
73 skb->mac_header = skb->network_header +
75 skb->transport_header = skb->network_header + ihl;
76 __skb_pull(skb, ihl);
77 memmove(skb_network_header(skb), iph, ihl);
82 static int mip6_rthdr_offset(struct sk_buff *skb, u8 **nexthdr, int type)
84 const unsigned char *nh = skb_network_header(skb);
89 packet_len = skb_tail_pointer(skb) - nh;
90 *nexthdr = &ipv6_hdr(skb)->nexthdr;
113 if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) {
129 exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
142 static int xfrm6_hdr_offset(struct xfrm_state *x, struct sk_buff *skb, u8 **prevhdr)
148 return mip6_rthdr_offset(skb, prevhdr, x->type->proto);
154 return ip6_find_1stfragopt(skb, prevhdr);
163 static int xfrm6_transport_output(struct xfrm_state *x, struct sk_buff *skb)
170 iph = ipv6_hdr(skb);
171 skb_set_inner_transport_header(skb, skb_transport_offset(skb));
173 hdr_len = xfrm6_hdr_offset(x, skb, &prevhdr);
176 skb_set_mac_header(skb,
177 (prevhdr - x->props.header_len) - skb->data);
178 skb_set_network_header(skb, -x->props.header_len);
179 skb->transport_header = skb->network_header + hdr_len;
180 __skb_pull(skb, hdr_len);
181 memmove(ipv6_hdr(skb), iph, hdr_len);
194 static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
201 iph = ipv6_hdr(skb);
203 hdr_len = xfrm6_hdr_offset(x, skb, &prevhdr);
206 skb_set_mac_header(skb,
207 (prevhdr - x->props.header_len) - skb->data);
208 skb_set_network_header(skb, -x->props.header_len);
209 skb->transport_header = skb->network_header + hdr_len;
210 __skb_pull(skb, hdr_len);
211 memmove(ipv6_hdr(skb), iph, hdr_len);
224 static int xfrm4_beet_encap_add(struct xfrm_state *x, struct sk_buff *skb)
231 optlen = XFRM_MODE_SKB_CB(skb)->optlen;
235 skb_set_network_header(skb, -x->props.header_len - hdrlen +
236 (XFRM_MODE_SKB_CB(skb)->ihl - sizeof(*top_iph)));
238 skb->network_header += IPV4_BEET_PHMAXLEN;
239 skb->mac_header = skb->network_header +
241 skb->transport_header = skb->network_header + sizeof(*top_iph);
243 xfrm4_beet_make_header(skb);
245 ph = __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdrlen);
247 top_iph = ip_hdr(skb);
273 static int xfrm4_tunnel_encap_add(struct xfrm_state *x, struct sk_buff *skb)
275 bool small_ipv6 = (skb->protocol == htons(ETH_P_IPV6)) && (skb->len <= IPV6_MIN_MTU);
276 struct dst_entry *dst = skb_dst(skb);
280 skb_set_inner_network_header(skb, skb_network_offset(skb));
281 skb_set_inner_transport_header(skb, skb_transport_offset(skb));
283 skb_set_network_header(skb, -x->props.header_len);
284 skb->mac_header = skb->network_header +
286 skb->transport_header = skb->network_header + sizeof(*top_iph);
287 top_iph = ip_hdr(skb);
292 top_iph->protocol = xfrm_af2proto(skb_dst(skb)->ops->family);
298 top_iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
300 XFRM_MODE_SKB_CB(skb)->tos);
307 0 : (XFRM_MODE_SKB_CB(skb)->frag_off & htons(IP_DF));
313 ip_select_ident(dev_net(dst->dev), skb, NULL);
319 static int xfrm6_tunnel_encap_add(struct xfrm_state *x, struct sk_buff *skb)
321 struct dst_entry *dst = skb_dst(skb);
325 skb_set_inner_network_header(skb, skb_network_offset(skb));
326 skb_set_inner_transport_header(skb, skb_transport_offset(skb));
328 skb_set_network_header(skb, -x->props.header_len);
329 skb->mac_header = skb->network_header +
331 skb->transport_header = skb->network_header + sizeof(*top_iph);
332 top_iph = ipv6_hdr(skb);
336 memcpy(top_iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
338 top_iph->nexthdr = xfrm_af2proto(skb_dst(skb)->ops->family);
343 dsfield = XFRM_MODE_SKB_CB(skb)->tos;
344 dsfield = INET_ECN_encapsulate(dsfield, XFRM_MODE_SKB_CB(skb)->tos);
354 static int xfrm6_beet_encap_add(struct xfrm_state *x, struct sk_buff *skb)
361 optlen = XFRM_MODE_SKB_CB(skb)->optlen;
365 skb_set_network_header(skb, -x->props.header_len - hdr_len);
367 skb->network_header += IPV4_BEET_PHMAXLEN;
368 skb->mac_header = skb->network_header +
370 skb->transport_header = skb->network_header + sizeof(*top_iph);
371 ph = __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdr_len);
373 xfrm6_beet_make_header(skb);
375 top_iph = ipv6_hdr(skb);
403 * while skb->data will point to the payload.
405 static int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
409 err = xfrm_inner_extract_output(x, skb);
413 IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE;
414 skb->protocol = htons(ETH_P_IP);
418 return xfrm4_beet_encap_add(x, skb);
420 return xfrm4_tunnel_encap_add(x, skb);
427 static int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
432 err = xfrm_inner_extract_output(x, skb);
436 skb->ignore_df = 1;
437 skb->protocol = htons(ETH_P_IPV6);
441 return xfrm6_beet_encap_add(x, skb);
443 return xfrm6_tunnel_encap_add(x, skb);
453 static int xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb)
459 return xfrm4_prepare_output(x, skb);
461 return xfrm6_prepare_output(x, skb);
465 return xfrm4_transport_output(x, skb);
467 return xfrm6_transport_output(x, skb);
471 return xfrm6_ro_output(x, skb);
483 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb)
485 return xfrm_outer_mode_output(x, skb);
490 static int xfrm_output_one(struct sk_buff *skb, int err)
492 struct dst_entry *dst = skb_dst(skb);
500 err = xfrm_skb_check_space(skb);
506 skb->mark = xfrm_smark_get(skb->mark, x);
508 err = xfrm_outer_mode_output(x, skb);
528 err = xfrm_replay_overflow(x, skb);
534 x->curlft.bytes += skb->len;
540 skb_dst_force(skb);
541 if (!skb_dst(skb)) {
547 if (xfrm_offload(skb)) {
548 x->type_offload->encap(x, skb);
551 skb->encapsulation = 0;
553 err = x->type->output(x, skb);
564 dst = skb_dst_pop(skb);
570 skb_dst_set(skb, dst);
579 kfree_skb(skb);
584 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err)
586 struct net *net = xs_net(skb_dst(skb)->xfrm);
588 while (likely((err = xfrm_output_one(skb, err)) == 0)) {
589 nf_reset_ct(skb);
591 err = skb_dst(skb)->ops->local_out(net, sk, skb);
595 if (!skb_dst(skb)->xfrm)
596 return dst_output(net, sk, skb);
598 err = nf_hook(skb_dst(skb)->ops->family,
599 NF_INET_POST_ROUTING, net, sk, skb,
600 NULL, skb_dst(skb)->dev, xfrm_output2);
613 static int xfrm_output2(struct net *net, struct sock *sk, struct sk_buff *skb)
615 return xfrm_output_resume(sk, skb, 1);
618 static int xfrm_output_gso(struct net *net, struct sock *sk, struct sk_buff *skb)
622 BUILD_BUG_ON(sizeof(*IPCB(skb)) > SKB_GSO_CB_OFFSET);
623 BUILD_BUG_ON(sizeof(*IP6CB(skb)) > SKB_GSO_CB_OFFSET);
624 segs = skb_gso_segment(skb, 0);
625 kfree_skb(skb);
653 * skb->inner_ipproto in any other case get the ip protocol from the IP
656 static void xfrm_get_inner_ipproto(struct sk_buff *skb, struct xfrm_state *x)
658 struct xfrm_offload *xo = xfrm_offload(skb);
667 xo->inner_ipproto = ip_hdr(skb)->protocol;
670 xo->inner_ipproto = ipv6_hdr(skb)->nexthdr;
680 if (!skb->encapsulation)
683 if (skb->inner_protocol_type == ENCAP_TYPE_IPPROTO) {
684 xo->inner_ipproto = skb->inner_ipproto;
688 if (skb->inner_protocol_type != ENCAP_TYPE_ETHER)
691 eth = (struct ethhdr *)skb_inner_mac_header(skb);
695 xo->inner_ipproto = inner_ipv6_hdr(skb)->nexthdr;
698 xo->inner_ipproto = inner_ip_hdr(skb)->protocol;
703 int xfrm_output(struct sock *sk, struct sk_buff *skb)
705 struct net *net = dev_net(skb_dst(skb)->dev);
706 struct xfrm_state *x = skb_dst(skb)->xfrm;
711 : skb_dst(skb)->ops->family;
715 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
716 IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
719 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
721 IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
726 if (!xfrm_dev_offload_ok(skb, x)) {
728 kfree_skb(skb);
732 return xfrm_output_resume(sk, skb, 0);
735 secpath_reset(skb);
737 if (xfrm_dev_offload_ok(skb, x)) {
740 sp = secpath_set(skb);
743 kfree_skb(skb);
751 xfrm_get_inner_ipproto(skb, x);
752 skb->encapsulation = 1;
754 if (skb_is_gso(skb)) {
755 if (skb->inner_protocol)
756 return xfrm_output_gso(net, sk, skb);
758 skb_shinfo(skb)->gso_type |= SKB_GSO_ESP;
765 if (skb_is_gso(skb))
766 return xfrm_output_gso(net, sk, skb);
769 if (skb->ip_summed == CHECKSUM_PARTIAL) {
770 err = skb_checksum_help(skb);
773 kfree_skb(skb);
779 return xfrm_output2(net, sk, skb);
783 static int xfrm4_tunnel_check_size(struct sk_buff *skb)
787 if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE)
790 if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->ignore_df)
793 mtu = dst_mtu(skb_dst(skb));
794 if ((!skb_is_gso(skb) && skb->len > mtu) ||
795 (skb_is_gso(skb) &&
796 !skb_gso_validate_network_len(skb, ip_skb_dst_mtu(skb->sk, skb)))) {
797 skb->protocol = htons(ETH_P_IP);
799 if (skb->sk)
800 xfrm_local_error(skb, mtu);
802 icmp_send(skb, ICMP_DEST_UNREACH,
810 static int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb)
815 ip_is_fragment(ip_hdr(skb))) {
820 err = xfrm4_tunnel_check_size(skb);
824 XFRM_MODE_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol;
826 xfrm4_extract_header(skb);
831 static int xfrm6_tunnel_check_size(struct sk_buff *skb)
834 struct dst_entry *dst = skb_dst(skb);
836 if (skb->ignore_df)
843 if ((!skb_is_gso(skb) && skb->len > mtu) ||
844 (skb_is_gso(skb) &&
845 !skb_gso_validate_network_len(skb, ip6_skb_dst_mtu(skb)))) {
846 skb->dev = dst->dev;
847 skb->protocol = htons(ETH_P_IPV6);
849 if (xfrm6_local_dontfrag(skb->sk))
850 ipv6_stub->xfrm6_local_rxpmtu(skb, mtu);
851 else if (skb->sk)
852 xfrm_local_error(skb, mtu);
854 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
862 static int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb)
867 err = xfrm6_tunnel_check_size(skb);
871 XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr;
873 xfrm6_extract_header(skb);
881 static int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb)
883 switch (skb->protocol) {
885 return xfrm4_extract_output(x, skb);
887 return xfrm6_extract_output(x, skb);
893 void xfrm_local_error(struct sk_buff *skb, int mtu)
898 if (skb->protocol == htons(ETH_P_IP))
900 else if (skb->protocol == htons(ETH_P_IPV6) &&
901 skb->sk->sk_family == AF_INET6)
908 afinfo->local_error(skb, mtu);