17 static int xfrm4_tunnel_check_size(struct sk_buff *skb)  in xfrm4_tunnel_check_size()  argument
21 	if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE)  in xfrm4_tunnel_check_size()
24 	if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->ignore_df)  in xfrm4_tunnel_check_size()
27 	mtu = dst_mtu(skb_dst(skb));  in xfrm4_tunnel_check_size()
28 	if ((!skb_is_gso(skb) && skb->len > mtu) ||  in xfrm4_tunnel_check_size()
29 	    (skb_is_gso(skb) &&  in xfrm4_tunnel_check_size()
30 	     !skb_gso_validate_network_len(skb, ip_skb_dst_mtu(skb->sk, skb)))) {  in xfrm4_tunnel_check_size()
31 		skb->protocol = htons(ETH_P_IP);  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_output_finish(struct sock *sk, struct sk_buff *skb)  in xfrm4_output_finish()  argument
59 	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));  in xfrm4_output_finish()
62 	IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;  in xfrm4_output_finish()
65 	return xfrm_output(sk, skb);  in xfrm4_output_finish()
68 static int __xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)  in __xfrm4_output()  argument
70 	struct xfrm_state *x = skb_dst(skb)->xfrm;  in __xfrm4_output()
76 		IPCB(skb)->flags |= IPSKB_REROUTED;  in __xfrm4_output()
77 		return dst_output(net, sk, skb);  in __xfrm4_output()
84 		ret = afinfo->output_finish(sk, skb);  in __xfrm4_output()
86 		kfree_skb(skb);  in __xfrm4_output()
92 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)  in xfrm4_output()  argument
95 			    net, sk, skb, NULL, skb_dst(skb)->dev,  in xfrm4_output()
97 			    !(IPCB(skb)->flags & IPSKB_REROUTED));  in xfrm4_output()
100 void xfrm4_local_error(struct sk_buff *skb, u32 mtu)  in xfrm4_local_error()  argument
104 	hdr = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb);  in xfrm4_local_error()
105 	ip_local_error(skb->sk, EMSGSIZE, hdr->daddr,  in xfrm4_local_error()
106 		       inet_sk(skb->sk)->inet_dport, mtu);  in xfrm4_local_error()