| | 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 | |
| | 29 | EXPORT_SYMBOL(xfrm6_find_1stfragopt); |
| | 30 | |
| | 31 | static int xfrm6_local_dontfrag(struct sk_buff *skb) |
| | 32 | { |
| | 33 | int proto; |
| | 34 | struct sock *sk = skb->sk; |
| | 35 | |
| | 36 | if (sk) { |
| | 37 | proto = sk->sk_protocol; |
| | 38 | |
| | 39 | if (proto == IPPROTO_UDP || proto == IPPROTO_RAW) |
| | 40 | return inet6_sk(sk)->dontfrag; |
| | 41 | } |
| | 42 | |
| | 43 | return 0; |
| | 44 | } |
| | 45 | |
| | 46 | static void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu) |
| | 47 | { |
| | 48 | struct flowi6 fl6; |
| | 49 | struct sock *sk = skb->sk; |
| | 50 | |
| | 51 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
| | 52 | fl6.daddr = ipv6_hdr(skb)->daddr; |
| | 53 | |
| | 54 | ipv6_local_rxpmtu(sk, &fl6, mtu); |
| | 55 | } |
| | 56 | |
| | 57 | static void xfrm6_local_error(struct sk_buff *skb, u32 mtu) |
| | 58 | { |
| | 59 | struct flowi6 fl6; |
| | 60 | struct sock *sk = skb->sk; |
| | 61 | |
| | 62 | fl6.fl6_dport = inet_sk(sk)->inet_dport; |
| | 63 | fl6.daddr = ipv6_hdr(skb)->daddr; |
| | 64 | |
| | 65 | ipv6_local_error(sk, EMSGSIZE, &fl6, mtu); |
| | 66 | } |
| | 67 | |
| | 68 | static int xfrm6_tunnel_check_size(struct sk_buff *skb) |
| | 69 | { |
| | 70 | int mtu, ret = 0; |
| | 71 | struct dst_entry *dst = skb_dst(skb); |
| | 72 | |
| | 73 | mtu = dst_mtu(dst); |
| | 74 | if (mtu < IPV6_MIN_MTU) |
| | 75 | mtu = IPV6_MIN_MTU; |
| | 76 | |
| | 77 | if (!skb->local_df && skb->len > mtu) { |
| | 78 | skb->dev = dst->dev; |
| | 79 | |
| | 80 | if (xfrm6_local_dontfrag(skb)) |
| | 81 | xfrm6_local_rxpmtu(skb, mtu); |
| | 82 | else if (skb->sk) |
| | 83 | xfrm6_local_error(skb, mtu); |
| | 84 | else |
| | 85 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
| | 86 | ret = -EMSGSIZE; |
| | 87 | } |
| | 88 | |
| | 89 | return ret; |
| | 90 | } |
| | 91 | |
| | 92 | int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb) |
| | 93 | { |
| | 94 | int err; |
| | 95 | |
| | 96 | err = xfrm6_tunnel_check_size(skb); |
| | 97 | if (err) |
| | 98 | return err; |
| | 99 | |
| | 100 | XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr; |
| | 101 | |
| | 102 | return xfrm6_extract_header(skb); |
| | 103 | } |
| | 104 | |
| | 105 | int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb) |
| | 106 | { |
| | 107 | int err; |
| | 108 | |
| | 109 | err = xfrm_inner_extract_output(x, skb); |
| | 110 | if (err) |
| | 111 | return err; |
| | 112 | |
| | 113 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); |
| | 114 | #ifdef CONFIG_NETFILTER |
| | 115 | IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED; |
| | 116 | #endif |
| | 117 | |
| | 118 | skb->protocol = htons(ETH_P_IPV6); |
| | 119 | skb->local_df = 1; |
| | 120 | |
| | 121 | return x->outer_mode->output2(x, skb); |
| | 122 | } |
| | 123 | EXPORT_SYMBOL(xfrm6_prepare_output); |
| | 124 | |
| | 125 | int xfrm6_output_finish(struct sk_buff *skb) |
| | 126 | { |
| | 127 | #ifdef CONFIG_NETFILTER |
| | 128 | IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED; |
| | 129 | #endif |
| | 130 | |
| | 131 | skb->protocol = htons(ETH_P_IPV6); |
| | 132 | return xfrm_output(skb); |
| | 133 | } |
| | 134 | |
| | 135 | static int __xfrm6_output(struct sk_buff *skb) |
| | 136 | { |
| | 137 | struct dst_entry *dst = skb_dst(skb); |
| | 138 | struct xfrm_state *x = dst->xfrm; |
| | 139 | int mtu = ip6_skb_dst_mtu(skb); |
| | 140 | |
| | 141 | if (skb->len > mtu && xfrm6_local_dontfrag(skb)) { |
| | 142 | xfrm6_local_rxpmtu(skb, mtu); |
| | 143 | return -EMSGSIZE; |
| | 144 | } else if (!skb->local_df && skb->len > mtu && skb->sk) { |
| | 145 | xfrm6_local_error(skb, mtu); |
| | 146 | return -EMSGSIZE; |
| | 147 | } |
| | 148 | |
| | 149 | if (x->props.mode == XFRM_MODE_TUNNEL && |
| | 150 | ((skb->len > mtu && !skb_is_gso(skb)) || |
| | 151 | dst_allfrag(skb_dst(skb)))) { |
| | 152 | return ip6_fragment(skb, x->outer_mode->afinfo->output_finish); |
| | 153 | } |
| | 154 | return x->outer_mode->afinfo->output_finish(skb); |
| | 155 | } |
| | 156 | |
| | 157 | int xfrm6_output(struct sk_buff *skb) |
| | 158 | { |
| | 159 | return NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL, |
| | 160 | skb_dst(skb)->dev, __xfrm6_output); |
| | 161 | } |
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