net/netfilter/nf_synproxy_core.c

419 		  const struct sk_buff *skb, struct sk_buff *nskb,
425 	nskb->ip_summed   = CHECKSUM_PARTIAL;
426 	nskb->csum_start  = (unsigned char *)nth - nskb->head;
427 	nskb->csum_offset = offsetof(struct tcphdr, check);
429 	skb_dst_set_noref(nskb, skb_dst(skb));
430 	nskb->protocol = htons(ETH_P_IP);
431 	if (ip_route_me_harder(net, nskb->sk, nskb, RTN_UNSPEC))
435 		nf_ct_set(nskb, (struct nf_conn *)nfct, ctinfo);
439 	ip_local_out(net, nskb->sk, nskb);
443 	kfree_skb(nskb);
451 	struct sk_buff *nskb;
460 	nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER,
462 	if (!nskb)
464 	skb_reserve(nskb, MAX_TCP_HEADER);
466 	niph = synproxy_build_ip(net, nskb, iph->daddr, iph->saddr);
468 	skb_reset_transport_header(nskb);
469 	nth = skb_put(nskb, tcp_hdr_size);
484 	synproxy_send_tcp(net, skb, nskb, skb_nfct(skb),
495 	struct sk_buff *nskb;
503 	nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER,
505 	if (!nskb)
507 	skb_reserve(nskb, MAX_TCP_HEADER);
509 	niph = synproxy_build_ip(net, nskb, iph->saddr, iph->daddr);
511 	skb_reset_transport_header(nskb);
512 	nth = skb_put(nskb, tcp_hdr_size);
530 	synproxy_send_tcp(net, skb, nskb, &snet->tmpl->ct_general, IP_CT_NEW,
540 	struct sk_buff *nskb;
548 	nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER,
550 	if (!nskb)
552 	skb_reserve(nskb, MAX_TCP_HEADER);
554 	niph = synproxy_build_ip(net, nskb, iph->daddr, iph->saddr);
556 	skb_reset_transport_header(nskb);
557 	nth = skb_put(nskb, tcp_hdr_size);
570 	synproxy_send_tcp(net, skb, nskb, NULL, 0, niph, nth, tcp_hdr_size);
578 	struct sk_buff *nskb;
586 	nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER,
588 	if (!nskb)
590 	skb_reserve(nskb, MAX_TCP_HEADER);
592 	niph = synproxy_build_ip(net, nskb, iph->saddr, iph->daddr);
594 	skb_reset_transport_header(nskb);
595 	nth = skb_put(nskb, tcp_hdr_size);
608 	synproxy_send_tcp(net, skb, nskb, skb_nfct(skb),
813 		       const struct sk_buff *skb, struct sk_buff *nskb,
823 	nskb->ip_summed   = CHECKSUM_PARTIAL;
824 	nskb->csum_start  = (unsigned char *)nth - nskb->head;
825 	nskb->csum_offset = offsetof(struct tcphdr, check);
844 	skb_dst_set(nskb, dst);
847 		nf_ct_set(nskb, (struct nf_conn *)nfct, ctinfo);
851 	ip6_local_out(net, nskb->sk, nskb);
855 	kfree_skb(nskb);
864 	struct sk_buff *nskb;
873 	nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER,
875 	if (!nskb)
877 	skb_reserve(nskb, MAX_TCP_HEADER);
879 	niph = synproxy_build_ip_ipv6(net, nskb, &iph->daddr, &iph->saddr);
881 	skb_reset_transport_header(nskb);
882 	nth = skb_put(nskb, tcp_hdr_size);
897 	synproxy_send_tcp_ipv6(net, skb, nskb, skb_nfct(skb),
909 	struct sk_buff *nskb;
917 	nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER,
919 	if (!nskb)
921 	skb_reserve(nskb, MAX_TCP_HEADER);
923 	niph = synproxy_build_ip_ipv6(net, nskb, &iph->saddr, &iph->daddr);
925 	skb_reset_transport_header(nskb);
926 	nth = skb_put(nskb, tcp_hdr_size);
944 	synproxy_send_tcp_ipv6(net, skb, nskb, &snet->tmpl->ct_general,
954 	struct sk_buff *nskb;
962 	nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER,
964 	if (!nskb)
966 	skb_reserve(nskb, MAX_TCP_HEADER);
968 	niph = synproxy_build_ip_ipv6(net, nskb, &iph->daddr, &iph->saddr);
970 	skb_reset_transport_header(nskb);
971 	nth = skb_put(nskb, tcp_hdr_size);
984 	synproxy_send_tcp_ipv6(net, skb, nskb, NULL, 0, niph, nth,
993 	struct sk_buff *nskb;
1001 	nskb = alloc_skb(sizeof(*niph) + tcp_hdr_size + MAX_TCP_HEADER,
1003 	if (!nskb)
1005 	skb_reserve(nskb, MAX_TCP_HEADER);
1007 	niph = synproxy_build_ip_ipv6(net, nskb, &iph->saddr, &iph->daddr);
1009 	skb_reset_transport_header(nskb);
1010 	nth = skb_put(nskb, tcp_hdr_size);
1023 	synproxy_send_tcp_ipv6(net, skb, nskb, skb_nfct(skb),