21 static int xfrm4_tunnel_check_size(struct sk_buff *skb)  in xfrm4_tunnel_check_size()  argument
25 	if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE)  in xfrm4_tunnel_check_size()
28 	if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->ignore_df)  in xfrm4_tunnel_check_size()
31 	mtu = dst_mtu(skb_dst(skb));  in xfrm4_tunnel_check_size()
32 	if (skb->len > mtu) {  in xfrm4_tunnel_check_size()
33 		skb->protocol = htons(ETH_P_IP);  in xfrm4_tunnel_check_size()
35 		if (skb->sk)  in xfrm4_tunnel_check_size()
36 			xfrm_local_error(skb, mtu);  in xfrm4_tunnel_check_size()
38 			icmp_send(skb, ICMP_DEST_UNREACH,  in xfrm4_tunnel_check_size()
46 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb)  in xfrm4_extract_output()  argument
50 	err = xfrm4_tunnel_check_size(skb);  in xfrm4_extract_output()
54 	XFRM_MODE_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol;  in xfrm4_extract_output()
56 	return xfrm4_extract_header(skb);  in xfrm4_extract_output()
59 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb)  in xfrm4_prepare_output()  argument
63 	err = xfrm_inner_extract_output(x, skb);  in xfrm4_prepare_output()
67 	IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE;  in xfrm4_prepare_output()
68 	skb->protocol = htons(ETH_P_IP);  in xfrm4_prepare_output()
70 	return x->outer_mode->output2(x, skb);  in xfrm4_prepare_output()
74 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb)  in xfrm4_output_finish()  argument
76 	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));  in xfrm4_output_finish()
79 	IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;  in xfrm4_output_finish()
82 	return xfrm_output(sk, skb);  in xfrm4_output_finish()
85 static int __xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)  in __xfrm4_output()  argument
87 	struct xfrm_state *x = skb_dst(skb)->xfrm;  in __xfrm4_output()
91 		IPCB(skb)->flags |= IPSKB_REROUTED;  in __xfrm4_output()
92 		return dst_output(net, sk, skb);  in __xfrm4_output()
96 	return x->outer_mode->afinfo->output_finish(sk, skb);  in __xfrm4_output()
99 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)  in xfrm4_output()  argument
102 			    net, sk, skb, NULL, skb_dst(skb)->dev,  in xfrm4_output()
104 			    !(IPCB(skb)->flags & IPSKB_REROUTED));  in xfrm4_output()
107 void xfrm4_local_error(struct sk_buff *skb, u32 mtu)  in xfrm4_local_error()  argument
111 	hdr = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb);  in xfrm4_local_error()
112 	ip_local_error(skb->sk, EMSGSIZE, hdr->daddr,  in xfrm4_local_error()
113 		       inet_sk(skb->sk)->inet_dport, mtu);  in xfrm4_local_error()