63 				      struct sk_buff *skb,
75 static int sctp_add_backlog(struct sock *sk, struct sk_buff *skb);
79 static inline int sctp_rcv_checksum(struct net *net, struct sk_buff *skb)  in sctp_rcv_checksum()  argument
81 	struct sctphdr *sh = sctp_hdr(skb);  in sctp_rcv_checksum()
83 	__le32 val = sctp_compute_cksum(skb, 0);  in sctp_rcv_checksum()
107 int sctp_rcv(struct sk_buff *skb)  in sctp_rcv()  argument
120 	struct net *net = dev_net(skb->dev);  in sctp_rcv()
122 	if (skb->pkt_type != PACKET_HOST)  in sctp_rcv()
127 	if (skb_linearize(skb))  in sctp_rcv()
130 	sh = sctp_hdr(skb);  in sctp_rcv()
133 	__skb_pull(skb, skb_transport_offset(skb));  in sctp_rcv()
134 	if (skb->len < sizeof(struct sctphdr))  in sctp_rcv()
137 	skb->csum_valid = 0; /* Previous value not applicable */  in sctp_rcv()
138 	if (skb_csum_unnecessary(skb))  in sctp_rcv()
139 		__skb_decr_checksum_unnecessary(skb);  in sctp_rcv()
140 	else if (!sctp_checksum_disable && sctp_rcv_checksum(net, skb) < 0)  in sctp_rcv()
142 	skb->csum_valid = 1;  in sctp_rcv()
144 	skb_pull(skb, sizeof(struct sctphdr));  in sctp_rcv()
147 	if (skb->len < sizeof(struct sctp_chunkhdr))  in sctp_rcv()
150 	family = ipver2af(ip_hdr(skb)->version);  in sctp_rcv()
156 	af->from_skb(&src, skb, 1);  in sctp_rcv()
157 	af->from_skb(&dest, skb, 0);  in sctp_rcv()
170 	if (!af->addr_valid(&src, NULL, skb) ||  in sctp_rcv()
171 	    !af->addr_valid(&dest, NULL, skb))  in sctp_rcv()
174 	asoc = __sctp_rcv_lookup(net, skb, &src, &dest, &transport);  in sctp_rcv()
187 	if (sk->sk_bound_dev_if && (sk->sk_bound_dev_if != af->skb_iif(skb))) {  in sctp_rcv()
210 		if (sctp_rcv_ootb(skb)) {  in sctp_rcv()
216 	if (!xfrm_policy_check(sk, XFRM_POLICY_IN, skb, family))  in sctp_rcv()
218 	nf_reset(skb);  in sctp_rcv()
220 	if (sk_filter(sk, skb))  in sctp_rcv()
224 	chunk = sctp_chunkify(skb, asoc, sk);  in sctp_rcv()
227 	SCTP_INPUT_CB(skb)->chunk = chunk;  in sctp_rcv()
261 		if (sctp_add_backlog(sk, skb)) {  in sctp_rcv()
264 			skb = NULL; /* sctp_chunk_free already freed the skb */  in sctp_rcv()
285 	kfree_skb(skb);  in sctp_rcv()
303 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb)  in sctp_backlog_rcv()  argument
305 	struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk;  in sctp_backlog_rcv()
337 			if (sk_add_backlog(sk, skb, sk->sk_rcvbuf))  in sctp_backlog_rcv()
365 static int sctp_add_backlog(struct sock *sk, struct sk_buff *skb)  in sctp_add_backlog()  argument
367 	struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk;  in sctp_add_backlog()
371 	ret = sk_add_backlog(sk, skb, sk->sk_rcvbuf);  in sctp_add_backlog()
419 			struct sk_buff *skb)  in sctp_icmp_redirect()  argument
427 		dst->ops->redirect(dst, sk, skb);  in sctp_icmp_redirect()
470 struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *skb,  in sctp_err_lookup()  argument
483 	int len = skb->len - ((void *)sctphdr - (void *)skb->data);  in sctp_err_lookup()
493 	af->from_skb(&saddr, skb, 1);  in sctp_err_lookup()
494 	af->from_skb(&daddr, skb, 0);  in sctp_err_lookup()
568 void sctp_v4_err(struct sk_buff *skb, __u32 info)  in sctp_v4_err()  argument
570 	const struct iphdr *iph = (const struct iphdr *)skb->data;  in sctp_v4_err()
572 	const int type = icmp_hdr(skb)->type;  in sctp_v4_err()
573 	const int code = icmp_hdr(skb)->code;  in sctp_v4_err()
580 	struct net *net = dev_net(skb->dev);  in sctp_v4_err()
583 	saveip = skb->network_header;  in sctp_v4_err()
584 	savesctp = skb->transport_header;  in sctp_v4_err()
585 	skb_reset_network_header(skb);  in sctp_v4_err()
586 	skb_set_transport_header(skb, ihlen);  in sctp_v4_err()
587 	sk = sctp_err_lookup(net, AF_INET, skb, sctp_hdr(skb), &asoc, &transport);  in sctp_v4_err()
589 	skb->network_header = saveip;  in sctp_v4_err()
590 	skb->transport_header = savesctp;  in sctp_v4_err()
630 		sctp_icmp_redirect(sk, transport, skb);  in sctp_v4_err()
660 static int sctp_rcv_ootb(struct sk_buff *skb)  in sctp_rcv_ootb()  argument
665 	ch = (sctp_chunkhdr_t *) skb->data;  in sctp_rcv_ootb()
674 		if (ch_end > skb_tail_pointer(skb))  in sctp_rcv_ootb()
696 		if (SCTP_CID_INIT == ch->type && (void *)ch != skb->data)  in sctp_rcv_ootb()
700 	} while (ch_end < skb_tail_pointer(skb));  in sctp_rcv_ootb()
935 	struct sk_buff *skb,  in __sctp_rcv_init_lookup()  argument
941 	struct sctphdr *sh = sctp_hdr(skb);  in __sctp_rcv_init_lookup()
963 	init = (sctp_init_chunk_t *)skb->data;  in __sctp_rcv_init_lookup()
1032 				      struct sk_buff *skb,  in __sctp_rcv_walk_lookup()  argument
1045 	ch = (sctp_chunkhdr_t *) skb->data;  in __sctp_rcv_walk_lookup()
1052 		if (ch_end > skb_tail_pointer(skb))  in __sctp_rcv_walk_lookup()
1076 						sctp_hdr(skb)->source,  in __sctp_rcv_walk_lookup()
1087 	} while (ch_end < skb_tail_pointer(skb));  in __sctp_rcv_walk_lookup()
1099 				      struct sk_buff *skb,  in __sctp_rcv_lookup_harder()  argument
1105 	ch = (sctp_chunkhdr_t *) skb->data;  in __sctp_rcv_lookup_harder()
1112 	if (WORD_ROUND(ntohs(ch->length)) > skb->len)  in __sctp_rcv_lookup_harder()
1117 		return __sctp_rcv_init_lookup(net, skb, laddr, transportp);  in __sctp_rcv_lookup_harder()
1119 	return __sctp_rcv_walk_lookup(net, skb, laddr, transportp);  in __sctp_rcv_lookup_harder()
1124 				      struct sk_buff *skb,  in __sctp_rcv_lookup()  argument
1138 		asoc = __sctp_rcv_lookup_harder(net, skb, laddr, transportp);  in __sctp_rcv_lookup()