23 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,  in xfrm6_find_1stfragopt()  argument
26 	return ip6_find_1stfragopt(skb, prevhdr);  in xfrm6_find_1stfragopt()
30 static int xfrm6_local_dontfrag(struct sk_buff *skb)  in xfrm6_local_dontfrag()  argument
33 	struct sock *sk = skb->sk;  in xfrm6_local_dontfrag()
47 static void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu)  in xfrm6_local_rxpmtu()  argument
50 	struct sock *sk = skb->sk;  in xfrm6_local_rxpmtu()
53 	fl6.daddr = ipv6_hdr(skb)->daddr;  in xfrm6_local_rxpmtu()
58 void xfrm6_local_error(struct sk_buff *skb, u32 mtu)  in xfrm6_local_error()  argument
62 	struct sock *sk = skb->sk;  in xfrm6_local_error()
64 	hdr = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb);  in xfrm6_local_error()
71 static int xfrm6_tunnel_check_size(struct sk_buff *skb)  in xfrm6_tunnel_check_size()  argument
74 	struct dst_entry *dst = skb_dst(skb);  in xfrm6_tunnel_check_size()
80 	if (!skb->ignore_df && skb->len > mtu) {  in xfrm6_tunnel_check_size()
81 		skb->dev = dst->dev;  in xfrm6_tunnel_check_size()
83 		if (xfrm6_local_dontfrag(skb))  in xfrm6_tunnel_check_size()
84 			xfrm6_local_rxpmtu(skb, mtu);  in xfrm6_tunnel_check_size()
85 		else if (skb->sk)  in xfrm6_tunnel_check_size()
86 			xfrm_local_error(skb, mtu);  in xfrm6_tunnel_check_size()
88 			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);  in xfrm6_tunnel_check_size()
95 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb)  in xfrm6_extract_output()  argument
99 	err = xfrm6_tunnel_check_size(skb);  in xfrm6_extract_output()
103 	XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr;  in xfrm6_extract_output()
105 	return xfrm6_extract_header(skb);  in xfrm6_extract_output()
108 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb)  in xfrm6_prepare_output()  argument
112 	err = xfrm_inner_extract_output(x, skb);  in xfrm6_prepare_output()
116 	skb->ignore_df = 1;  in xfrm6_prepare_output()
118 	return x->outer_mode->output2(x, skb);  in xfrm6_prepare_output()
122 int xfrm6_output_finish(struct sk_buff *skb)  in xfrm6_output_finish()  argument
124 	memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));  in xfrm6_output_finish()
125 	skb->protocol = htons(ETH_P_IPV6);  in xfrm6_output_finish()
128 	IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;  in xfrm6_output_finish()
131 	return xfrm_output(skb);  in xfrm6_output_finish()
134 static int __xfrm6_output(struct sk_buff *skb)  in __xfrm6_output()  argument
136 	struct dst_entry *dst = skb_dst(skb);  in __xfrm6_output()
142 		IP6CB(skb)->flags |= IP6SKB_REROUTED;  in __xfrm6_output()
143 		return dst_output(skb);  in __xfrm6_output()
147 	if (skb->protocol == htons(ETH_P_IPV6))  in __xfrm6_output()
148 		mtu = ip6_skb_dst_mtu(skb);  in __xfrm6_output()
150 		mtu = dst_mtu(skb_dst(skb));  in __xfrm6_output()
152 	if (skb->len > mtu && xfrm6_local_dontfrag(skb)) {  in __xfrm6_output()
153 		xfrm6_local_rxpmtu(skb, mtu);  in __xfrm6_output()
155 	} else if (!skb->ignore_df && skb->len > mtu && skb->sk) {  in __xfrm6_output()
156 		xfrm_local_error(skb, mtu);  in __xfrm6_output()
161 	    ((skb->len > mtu && !skb_is_gso(skb)) ||  in __xfrm6_output()
162 		dst_allfrag(skb_dst(skb)))) {  in __xfrm6_output()
163 			return ip6_fragment(skb, x->outer_mode->afinfo->output_finish);  in __xfrm6_output()
165 	return x->outer_mode->afinfo->output_finish(skb);  in __xfrm6_output()
168 int xfrm6_output(struct sock *sk, struct sk_buff *skb)  in xfrm6_output()  argument
170 	return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb,  in xfrm6_output()
171 			    NULL, skb_dst(skb)->dev, __xfrm6_output,  in xfrm6_output()
172 			    !(IP6CB(skb)->flags & IP6SKB_REROUTED));  in xfrm6_output()