190 static void dccp_do_redirect(struct sk_buff *skb, struct sock *sk)  in dccp_do_redirect()  argument
195 		dst->ops->redirect(dst, sk, skb);  in dccp_do_redirect()
236 static void dccp_v4_err(struct sk_buff *skb, u32 info)  in dccp_v4_err()  argument
238 	const struct iphdr *iph = (struct iphdr *)skb->data;  in dccp_v4_err()
240 	const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);  in dccp_v4_err()
243 	const int type = icmp_hdr(skb)->type;  in dccp_v4_err()
244 	const int code = icmp_hdr(skb)->code;  in dccp_v4_err()
248 	struct net *net = dev_net(skb->dev);  in dccp_v4_err()
250 	if (skb->len < offset + sizeof(*dh) ||  in dccp_v4_err()
251 	    skb->len < offset + __dccp_basic_hdr_len(dh)) {  in dccp_v4_err()
259 				       inet_iif(skb));  in dccp_v4_err()
292 		dccp_do_redirect(skb, sk);  in dccp_v4_err()
361 static inline __sum16 dccp_v4_csum_finish(struct sk_buff *skb,  in dccp_v4_csum_finish()  argument
364 	return csum_tcpudp_magic(src, dst, skb->len, IPPROTO_DCCP, skb->csum);  in dccp_v4_csum_finish()
367 void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb)  in dccp_v4_send_check()  argument
370 	struct dccp_hdr *dh = dccp_hdr(skb);  in dccp_v4_send_check()
372 	dccp_csum_outgoing(skb);  in dccp_v4_send_check()
373 	dh->dccph_checksum = dccp_v4_csum_finish(skb,  in dccp_v4_send_check()
379 static inline u64 dccp_v4_init_sequence(const struct sk_buff *skb)  in dccp_v4_init_sequence()  argument
381 	return secure_dccp_sequence_number(ip_hdr(skb)->daddr,  in dccp_v4_init_sequence()
382 					   ip_hdr(skb)->saddr,  in dccp_v4_init_sequence()
383 					   dccp_hdr(skb)->dccph_dport,  in dccp_v4_init_sequence()
384 					   dccp_hdr(skb)->dccph_sport);  in dccp_v4_init_sequence()
393 struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb,  in dccp_v4_request_recv_sock()  argument
404 	newsk = dccp_create_openreq_child(sk, req, skb);  in dccp_v4_request_recv_sock()
415 	newinet->mc_index  = inet_iif(skb);  in dccp_v4_request_recv_sock()
416 	newinet->mc_ttl	   = ip_hdr(skb)->ttl;  in dccp_v4_request_recv_sock()
446 static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)  in dccp_v4_hnd_req()  argument
448 	const struct dccp_hdr *dh = dccp_hdr(skb);  in dccp_v4_hnd_req()
449 	const struct iphdr *iph = ip_hdr(skb);  in dccp_v4_hnd_req()
455 		nsk = dccp_check_req(sk, skb, req);  in dccp_v4_hnd_req()
463 				      inet_iif(skb));  in dccp_v4_hnd_req()
477 					   struct sk_buff *skb)  in dccp_v4_route_skb()  argument
480 	const struct iphdr *iph = ip_hdr(skb);  in dccp_v4_route_skb()
482 		.flowi4_oif = inet_iif(skb),  in dccp_v4_route_skb()
487 		.fl4_sport = dccp_hdr(skb)->dccph_dport,  in dccp_v4_route_skb()
488 		.fl4_dport = dccp_hdr(skb)->dccph_sport,  in dccp_v4_route_skb()
491 	security_skb_classify_flow(skb, flowi4_to_flowi(&fl4));  in dccp_v4_route_skb()
504 	struct sk_buff *skb;  in dccp_v4_send_response()  local
512 	skb = dccp_make_response(sk, dst, req);  in dccp_v4_send_response()
513 	if (skb != NULL) {  in dccp_v4_send_response()
515 		struct dccp_hdr *dh = dccp_hdr(skb);  in dccp_v4_send_response()
517 		dh->dccph_checksum = dccp_v4_csum_finish(skb, ireq->ir_loc_addr,  in dccp_v4_send_response()
519 		err = ip_build_and_send_pkt(skb, sk, ireq->ir_loc_addr,  in dccp_v4_send_response()
534 	struct sk_buff *skb;  in dccp_v4_ctl_send_reset()  local
550 	skb = dccp_ctl_make_reset(ctl_sk, rxskb);  in dccp_v4_ctl_send_reset()
551 	if (skb == NULL)  in dccp_v4_ctl_send_reset()
555 	dccp_hdr(skb)->dccph_checksum = dccp_v4_csum_finish(skb, rxiph->saddr,  in dccp_v4_ctl_send_reset()
557 	skb_dst_set(skb, dst_clone(dst));  in dccp_v4_ctl_send_reset()
560 	err = ip_build_and_send_pkt(skb, ctl_sk,  in dccp_v4_ctl_send_reset()
593 int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)  in dccp_v4_conn_request()  argument
598 	const __be32 service = dccp_hdr_request(skb)->dccph_req_service;  in dccp_v4_conn_request()
599 	struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);  in dccp_v4_conn_request()
602 	if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))  in dccp_v4_conn_request()
631 	if (dccp_reqsk_init(req, dccp_sk(sk), skb))  in dccp_v4_conn_request()
635 	if (dccp_parse_options(sk, dreq, skb))  in dccp_v4_conn_request()
638 	if (security_inet_conn_request(sk, skb, req))  in dccp_v4_conn_request()
642 	sk_rcv_saddr_set(req_to_sk(req), ip_hdr(skb)->daddr);  in dccp_v4_conn_request()
643 	sk_daddr_set(req_to_sk(req), ip_hdr(skb)->saddr);  in dccp_v4_conn_request()
656 	dreq->dreq_iss	   = dccp_v4_init_sequence(skb);  in dccp_v4_conn_request()
674 int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)  in dccp_v4_do_rcv()  argument
676 	struct dccp_hdr *dh = dccp_hdr(skb);  in dccp_v4_do_rcv()
679 		if (dccp_rcv_established(sk, skb, dh, skb->len))  in dccp_v4_do_rcv()
708 		struct sock *nsk = dccp_v4_hnd_req(sk, skb);  in dccp_v4_do_rcv()
714 			if (dccp_child_process(sk, nsk, skb))  in dccp_v4_do_rcv()
720 	if (dccp_rcv_state_process(sk, skb, dh, skb->len))  in dccp_v4_do_rcv()
725 	dccp_v4_ctl_send_reset(sk, skb);  in dccp_v4_do_rcv()
727 	kfree_skb(skb);  in dccp_v4_do_rcv()
737 int dccp_invalid_packet(struct sk_buff *skb)  in dccp_invalid_packet()  argument
742 	if (skb->pkt_type != PACKET_HOST)  in dccp_invalid_packet()
746 	if (!pskb_may_pull(skb, sizeof(struct dccp_hdr))) {  in dccp_invalid_packet()
751 	dh = dccp_hdr(skb);  in dccp_invalid_packet()
762 	if (dh->dccph_doff < dccp_hdr_len(skb) / sizeof(u32)) {  in dccp_invalid_packet()
769 	if (!pskb_may_pull(skb, dh->dccph_doff * sizeof(u32))) {  in dccp_invalid_packet()
789 	cscov = dccp_csum_coverage(skb);  in dccp_invalid_packet()
790 	if (cscov > skb->len) {  in dccp_invalid_packet()
792 			  dh->dccph_cscov, skb->len);  in dccp_invalid_packet()
798 	skb->csum = skb_checksum(skb, 0, cscov, 0);  in dccp_invalid_packet()
805 static int dccp_v4_rcv(struct sk_buff *skb)  in dccp_v4_rcv()  argument
814 	if (dccp_invalid_packet(skb))  in dccp_v4_rcv()
817 	iph = ip_hdr(skb);  in dccp_v4_rcv()
819 	if (dccp_v4_csum_finish(skb, iph->saddr, iph->daddr)) {  in dccp_v4_rcv()
824 	dh = dccp_hdr(skb);  in dccp_v4_rcv()
826 	DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);  in dccp_v4_rcv()
827 	DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;  in dccp_v4_rcv()
833 		      (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq);  in dccp_v4_rcv()
835 	if (dccp_packet_without_ack(skb)) {  in dccp_v4_rcv()
836 		DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;  in dccp_v4_rcv()
839 		DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);  in dccp_v4_rcv()
841 				  DCCP_SKB_CB(skb)->dccpd_ack_seq);  in dccp_v4_rcv()
846 	sk = __inet_lookup_skb(&dccp_hashinfo, skb,  in dccp_v4_rcv()
885 	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))  in dccp_v4_rcv()
887 	nf_reset(skb);  in dccp_v4_rcv()
889 	return sk_receive_skb(sk, skb, 1);  in dccp_v4_rcv()
892 	if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))  in dccp_v4_rcv()
901 		DCCP_SKB_CB(skb)->dccpd_reset_code =  in dccp_v4_rcv()
903 		dccp_v4_ctl_send_reset(sk, skb);  in dccp_v4_rcv()
907 	kfree_skb(skb);  in dccp_v4_rcv()