ia64/linux-2.6.18-xen.hg

view net/ipv6/xfrm6_output.c @ 673:3161879fdf22

[IA64] xencomm: support XENMEM_add_to_physmap and XENMEM_remove_from_phsymap

support XENMEM_add_to_physmap and XENMEM_remove_from_phsymap.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Tue Sep 16 21:26:15 2008 +0900 (2008-09-16)
parents 831230e53067
children
line source
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 */
12 #include <linux/compiler.h>
13 #include <linux/skbuff.h>
14 #include <linux/spinlock.h>
15 #include <linux/icmpv6.h>
16 #include <linux/netfilter_ipv6.h>
17 #include <net/ipv6.h>
18 #include <net/xfrm.h>
20 static int xfrm6_tunnel_check_size(struct sk_buff *skb)
21 {
22 int mtu, ret = 0;
23 struct dst_entry *dst = skb->dst;
25 mtu = dst_mtu(dst);
26 if (mtu < IPV6_MIN_MTU)
27 mtu = IPV6_MIN_MTU;
29 if (skb->len > mtu) {
30 skb->dev = dst->dev;
31 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
32 ret = -EMSGSIZE;
33 }
35 return ret;
36 }
38 static int xfrm6_output_one(struct sk_buff *skb)
39 {
40 struct dst_entry *dst = skb->dst;
41 struct xfrm_state *x = dst->xfrm;
42 int err;
44 if (skb->ip_summed == CHECKSUM_HW) {
45 err = skb_checksum_help(skb, 0);
46 if (err)
47 goto error_nolock;
48 }
50 if (x->props.mode) {
51 err = xfrm6_tunnel_check_size(skb);
52 if (err)
53 goto error_nolock;
54 }
56 do {
57 spin_lock_bh(&x->lock);
58 err = xfrm_state_check(x, skb);
59 if (err)
60 goto error;
62 err = x->mode->output(skb);
63 if (err)
64 goto error;
66 err = x->type->output(x, skb);
67 if (err)
68 goto error;
70 x->curlft.bytes += skb->len;
71 x->curlft.packets++;
73 spin_unlock_bh(&x->lock);
75 skb->nh.raw = skb->data;
77 if (!(skb->dst = dst_pop(dst))) {
78 err = -EHOSTUNREACH;
79 goto error_nolock;
80 }
81 dst = skb->dst;
82 x = dst->xfrm;
83 } while (x && !x->props.mode);
85 IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
86 err = 0;
88 out_exit:
89 return err;
90 error:
91 spin_unlock_bh(&x->lock);
92 error_nolock:
93 kfree_skb(skb);
94 goto out_exit;
95 }
97 static int xfrm6_output_finish2(struct sk_buff *skb)
98 {
99 int err;
101 while (likely((err = xfrm6_output_one(skb)) == 0)) {
102 nf_reset(skb);
104 err = nf_hook(PF_INET6, NF_IP6_LOCAL_OUT, &skb, NULL,
105 skb->dst->dev, dst_output);
106 if (unlikely(err != 1))
107 break;
109 if (!skb->dst->xfrm)
110 return dst_output(skb);
112 err = nf_hook(PF_INET6, NF_IP6_POST_ROUTING, &skb, NULL,
113 skb->dst->dev, xfrm6_output_finish2);
114 if (unlikely(err != 1))
115 break;
116 }
118 return err;
119 }
121 static int xfrm6_output_finish(struct sk_buff *skb)
122 {
123 struct sk_buff *segs;
125 if (!skb_is_gso(skb))
126 return xfrm6_output_finish2(skb);
128 skb->protocol = htons(ETH_P_IPV6);
129 segs = skb_gso_segment(skb, 0);
130 kfree_skb(skb);
131 if (unlikely(IS_ERR(segs)))
132 return PTR_ERR(segs);
134 do {
135 struct sk_buff *nskb = segs->next;
136 int err;
138 segs->next = NULL;
139 err = xfrm6_output_finish2(segs);
141 if (unlikely(err)) {
142 while ((segs = nskb)) {
143 nskb = segs->next;
144 segs->next = NULL;
145 kfree_skb(segs);
146 }
147 return err;
148 }
150 segs = nskb;
151 } while (segs);
153 return 0;
154 }
156 int xfrm6_output(struct sk_buff *skb)
157 {
158 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dst->dev,
159 xfrm6_output_finish);
160 }