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Linux/net/ipv6/xfrm6_output.c

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  1 /*
  2  * xfrm6_output.c - Common IPsec encapsulation code for IPv6.
  3  * Copyright (C) 2002 USAGI/WIDE Project
  4  * Copyright (c) 2004 Herbert Xu <herbert@gondor.apana.org.au>
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the License, or (at your option) any later version.
 10  */
 11 
 12 #include <linux/if_ether.h>
 13 #include <linux/kernel.h>
 14 #include <linux/module.h>
 15 #include <linux/skbuff.h>
 16 #include <linux/icmpv6.h>
 17 #include <linux/netfilter_ipv6.h>
 18 #include <net/dst.h>
 19 #include <net/ipv6.h>
 20 #include <net/ip6_route.h>
 21 #include <net/xfrm.h>
 22 
 23 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
 24                           u8 **prevhdr)
 25 {
 26         return ip6_find_1stfragopt(skb, prevhdr);
 27 }
 28 EXPORT_SYMBOL(xfrm6_find_1stfragopt);
 29 
 30 static int xfrm6_local_dontfrag(struct sk_buff *skb)
 31 {
 32         int proto;
 33         struct sock *sk = skb->sk;
 34 
 35         if (sk) {
 36                 if (sk->sk_family != AF_INET6)
 37                         return 0;
 38 
 39                 proto = sk->sk_protocol;
 40                 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
 41                         return inet6_sk(sk)->dontfrag;
 42         }
 43 
 44         return 0;
 45 }
 46 
 47 static void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu)
 48 {
 49         struct flowi6 fl6;
 50         struct sock *sk = skb->sk;
 51 
 52         fl6.flowi6_oif = sk->sk_bound_dev_if;
 53         fl6.daddr = ipv6_hdr(skb)->daddr;
 54 
 55         ipv6_local_rxpmtu(sk, &fl6, mtu);
 56 }
 57 
 58 void xfrm6_local_error(struct sk_buff *skb, u32 mtu)
 59 {
 60         struct flowi6 fl6;
 61         const struct ipv6hdr *hdr;
 62         struct sock *sk = skb->sk;
 63 
 64         hdr = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb);
 65         fl6.fl6_dport = inet_sk(sk)->inet_dport;
 66         fl6.daddr = hdr->daddr;
 67 
 68         ipv6_local_error(sk, EMSGSIZE, &fl6, mtu);
 69 }
 70 
 71 static int xfrm6_tunnel_check_size(struct sk_buff *skb)
 72 {
 73         int mtu, ret = 0;
 74         struct dst_entry *dst = skb_dst(skb);
 75 
 76         mtu = dst_mtu(dst);
 77         if (mtu < IPV6_MIN_MTU)
 78                 mtu = IPV6_MIN_MTU;
 79 
 80         if (!skb->ignore_df && skb->len > mtu) {
 81                 skb->dev = dst->dev;
 82 
 83                 if (xfrm6_local_dontfrag(skb))
 84                         xfrm6_local_rxpmtu(skb, mtu);
 85                 else if (skb->sk)
 86                         xfrm_local_error(skb, mtu);
 87                 else
 88                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 89                 ret = -EMSGSIZE;
 90         }
 91 
 92         return ret;
 93 }
 94 
 95 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb)
 96 {
 97         int err;
 98 
 99         err = xfrm6_tunnel_check_size(skb);
100         if (err)
101                 return err;
102 
103         XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr;
104 
105         return xfrm6_extract_header(skb);
106 }
107 
108 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
109 {
110         int err;
111 
112         err = xfrm_inner_extract_output(x, skb);
113         if (err)
114                 return err;
115 
116         skb->ignore_df = 1;
117         skb->protocol = htons(ETH_P_IPV6);
118 
119         return x->outer_mode->output2(x, skb);
120 }
121 EXPORT_SYMBOL(xfrm6_prepare_output);
122 
123 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb)
124 {
125         memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
126 
127 #ifdef CONFIG_NETFILTER
128         IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
129 #endif
130 
131         return xfrm_output(sk, skb);
132 }
133 
134 static int __xfrm6_output(struct sock *sk, struct sk_buff *skb)
135 {
136         struct dst_entry *dst = skb_dst(skb);
137         struct xfrm_state *x = dst->xfrm;
138         int mtu;
139 
140 #ifdef CONFIG_NETFILTER
141         if (!x) {
142                 IP6CB(skb)->flags |= IP6SKB_REROUTED;
143                 return dst_output_sk(sk, skb);
144         }
145 #endif
146 
147         if (skb->protocol == htons(ETH_P_IPV6))
148                 mtu = ip6_skb_dst_mtu(skb);
149         else
150                 mtu = dst_mtu(skb_dst(skb));
151 
152         if (skb->len > mtu && xfrm6_local_dontfrag(skb)) {
153                 xfrm6_local_rxpmtu(skb, mtu);
154                 return -EMSGSIZE;
155         } else if (!skb->ignore_df && skb->len > mtu && skb->sk) {
156                 xfrm_local_error(skb, mtu);
157                 return -EMSGSIZE;
158         }
159 
160         if (x->props.mode == XFRM_MODE_TUNNEL &&
161             ((skb->len > mtu && !skb_is_gso(skb)) ||
162                 dst_allfrag(skb_dst(skb)))) {
163                 return ip6_fragment(sk, skb,
164                                     x->outer_mode->afinfo->output_finish);
165         }
166         return x->outer_mode->afinfo->output_finish(sk, skb);
167 }
168 
169 int xfrm6_output(struct sock *sk, struct sk_buff *skb)
170 {
171         return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, sk, skb,
172                             NULL, skb_dst(skb)->dev, __xfrm6_output,
173                             !(IP6CB(skb)->flags & IP6SKB_REROUTED));
174 }
175 

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