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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 | /* * 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/compiler.h> #include <linux/skbuff.h> #include <linux/spinlock.h> #include <linux/icmpv6.h> #include <linux/netfilter_ipv6.h> #include <net/ipv6.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); } static int xfrm6_tunnel_check_size(struct sk_buff *skb) { int mtu, ret = 0; struct dst_entry *dst = skb->dst; mtu = dst_mtu(dst); if (mtu < IPV6_MIN_MTU) mtu = IPV6_MIN_MTU; if (skb->len > mtu) { skb->dev = dst->dev; icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev); ret = -EMSGSIZE; } return ret; } static int xfrm6_output_one(struct sk_buff *skb) { struct dst_entry *dst = skb->dst; struct xfrm_state *x = dst->xfrm; int err; if (skb->ip_summed == CHECKSUM_PARTIAL) { err = skb_checksum_help(skb); if (err) goto error_nolock; } if (x->props.mode == XFRM_MODE_TUNNEL) { err = xfrm6_tunnel_check_size(skb); if (err) goto error_nolock; } do { spin_lock_bh(&x->lock); err = xfrm_state_check(x, skb); if (err) goto error; err = x->mode->output(x, skb); if (err) goto error; err = x->type->output(x, skb); if (err) goto error; x->curlft.bytes += skb->len; x->curlft.packets++; if (x->props.mode == XFRM_MODE_ROUTEOPTIMIZATION) x->lastused = (u64)xtime.tv_sec; spin_unlock_bh(&x->lock); skb->nh.raw = skb->data; if (!(skb->dst = dst_pop(dst))) { err = -EHOSTUNREACH; goto error_nolock; } dst = skb->dst; x = dst->xfrm; } while (x && (x->props.mode != XFRM_MODE_TUNNEL)); IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED; err = 0; out_exit: return err; error: spin_unlock_bh(&x->lock); error_nolock: kfree_skb(skb); goto out_exit; } static int xfrm6_output_finish2(struct sk_buff *skb) { int err; while (likely((err = xfrm6_output_one(skb)) == 0)) { nf_reset(skb); err = nf_hook(PF_INET6, NF_IP6_LOCAL_OUT, &skb, NULL, skb->dst->dev, dst_output); if (unlikely(err != 1)) break; if (!skb->dst->xfrm) return dst_output(skb); err = nf_hook(PF_INET6, NF_IP6_POST_ROUTING, &skb, NULL, skb->dst->dev, xfrm6_output_finish2); if (unlikely(err != 1)) break; } return err; } static int xfrm6_output_finish(struct sk_buff *skb) { struct sk_buff *segs; if (!skb_is_gso(skb)) return xfrm6_output_finish2(skb); skb->protocol = htons(ETH_P_IPV6); segs = skb_gso_segment(skb, 0); kfree_skb(skb); if (unlikely(IS_ERR(segs))) return PTR_ERR(segs); do { struct sk_buff *nskb = segs->next; int err; segs->next = NULL; err = xfrm6_output_finish2(segs); if (unlikely(err)) { while ((segs = nskb)) { nskb = segs->next; segs->next = NULL; kfree_skb(segs); } return err; } segs = nskb; } while (segs); return 0; } int xfrm6_output(struct sk_buff *skb) { return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dst->dev, xfrm6_output_finish); } |