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 		if (skb->sk)  in xfrm4_tunnel_check_size()
34 			xfrm_local_error(skb, mtu);  in xfrm4_tunnel_check_size()
36 			icmp_send(skb, ICMP_DEST_UNREACH,  in xfrm4_tunnel_check_size()
44 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb)  in xfrm4_extract_output()  argument
48 	err = xfrm4_tunnel_check_size(skb);  in xfrm4_extract_output()
52 	XFRM_MODE_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol;  in xfrm4_extract_output()
54 	return xfrm4_extract_header(skb);  in xfrm4_extract_output()
57 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb)  in xfrm4_prepare_output()  argument
61 	err = xfrm_inner_extract_output(x, skb);  in xfrm4_prepare_output()
65 	IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE;  in xfrm4_prepare_output()
67 	return x->outer_mode->output2(x, skb);  in xfrm4_prepare_output()
71 int xfrm4_output_finish(struct sk_buff *skb)  in xfrm4_output_finish()  argument
73 	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));  in xfrm4_output_finish()
74 	skb->protocol = htons(ETH_P_IP);  in xfrm4_output_finish()
77 	IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;  in xfrm4_output_finish()
80 	return xfrm_output(skb);  in xfrm4_output_finish()
83 static int __xfrm4_output(struct sk_buff *skb)  in __xfrm4_output()  argument
85 	struct xfrm_state *x = skb_dst(skb)->xfrm;  in __xfrm4_output()
89 		IPCB(skb)->flags |= IPSKB_REROUTED;  in __xfrm4_output()
90 		return dst_output(skb);  in __xfrm4_output()
94 	return x->outer_mode->afinfo->output_finish(skb);  in __xfrm4_output()
97 int xfrm4_output(struct sock *sk, struct sk_buff *skb)  in xfrm4_output()  argument
99 	return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, skb,  in xfrm4_output()
100 			    NULL, skb_dst(skb)->dev, __xfrm4_output,  in xfrm4_output()
101 			    !(IPCB(skb)->flags & IPSKB_REROUTED));  in xfrm4_output()
104 void xfrm4_local_error(struct sk_buff *skb, u32 mtu)  in xfrm4_local_error()  argument
108 	hdr = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb);  in xfrm4_local_error()
109 	ip_local_error(skb->sk, EMSGSIZE, hdr->daddr,  in xfrm4_local_error()
110 		       inet_sk(skb->sk)->inet_dport, mtu);  in xfrm4_local_error()