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