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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         if (skb->ignore_df)
 77                 goto out;
 78 
 79         mtu = dst_mtu(dst);
 80         if (mtu < IPV6_MIN_MTU)
 81                 mtu = IPV6_MIN_MTU;
 82 
 83         if ((!skb_is_gso(skb) && skb->len > mtu) ||
 84             (skb_is_gso(skb) &&
 85              skb_gso_network_seglen(skb) > ip6_skb_dst_mtu(skb))) {
 86                 skb->dev = dst->dev;
 87                 skb->protocol = htons(ETH_P_IPV6);
 88 
 89                 if (xfrm6_local_dontfrag(skb))
 90                         xfrm6_local_rxpmtu(skb, mtu);
 91                 else if (skb->sk)
 92                         xfrm_local_error(skb, mtu);
 93                 else
 94                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 95                 ret = -EMSGSIZE;
 96         }
 97 out:
 98         return ret;
 99 }
100 
101 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb)
102 {
103         int err;
104 
105         err = xfrm6_tunnel_check_size(skb);
106         if (err)
107                 return err;
108 
109         XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr;
110 
111         return xfrm6_extract_header(skb);
112 }
113 
114 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
115 {
116         int err;
117 
118         err = xfrm_inner_extract_output(x, skb);
119         if (err)
120                 return err;
121 
122         skb->ignore_df = 1;
123         skb->protocol = htons(ETH_P_IPV6);
124 
125         return x->outer_mode->output2(x, skb);
126 }
127 EXPORT_SYMBOL(xfrm6_prepare_output);
128 
129 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb)
130 {
131         memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
132 
133 #ifdef CONFIG_NETFILTER
134         IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
135 #endif
136 
137         return xfrm_output(sk, skb);
138 }
139 
140 static int __xfrm6_output_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
141 {
142         struct xfrm_state *x = skb_dst(skb)->xfrm;
143 
144         return x->outer_mode->afinfo->output_finish(sk, skb);
145 }
146 
147 static int __xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
148 {
149         struct dst_entry *dst = skb_dst(skb);
150         struct xfrm_state *x = dst->xfrm;
151         int mtu;
152         bool toobig;
153 
154 #ifdef CONFIG_NETFILTER
155         if (!x) {
156                 IP6CB(skb)->flags |= IP6SKB_REROUTED;
157                 return dst_output(net, sk, skb);
158         }
159 #endif
160 
161         if (x->props.mode != XFRM_MODE_TUNNEL)
162                 goto skip_frag;
163 
164         if (skb->protocol == htons(ETH_P_IPV6))
165                 mtu = ip6_skb_dst_mtu(skb);
166         else
167                 mtu = dst_mtu(skb_dst(skb));
168 
169         toobig = skb->len > mtu && !skb_is_gso(skb);
170 
171         if (toobig && xfrm6_local_dontfrag(skb)) {
172                 xfrm6_local_rxpmtu(skb, mtu);
173                 return -EMSGSIZE;
174         } else if (!skb->ignore_df && toobig && skb->sk) {
175                 xfrm_local_error(skb, mtu);
176                 return -EMSGSIZE;
177         }
178 
179         if (toobig || dst_allfrag(skb_dst(skb)))
180                 return ip6_fragment(net, sk, skb,
181                                     __xfrm6_output_finish);
182 
183 skip_frag:
184         return x->outer_mode->afinfo->output_finish(sk, skb);
185 }
186 
187 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
188 {
189         return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
190                             net, sk, skb,  NULL, skb_dst(skb)->dev,
191                             __xfrm6_output,
192                             !(IP6CB(skb)->flags & IP6SKB_REROUTED));
193 }
194 

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