projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 406ef77c HX |
1 | /* |
| 2 | * xfrm_output.c - Common IPsec encapsulation code. | |
| 3 | * | |
| 4 | * Copyright (c) 2007 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/errno.h> | |
| 13 | #include <linux/module.h> | |
| 14 | #include <linux/netdevice.h> | |
| 15 | #include <linux/skbuff.h> | |
| 16 | #include <linux/spinlock.h> | |
| 406ef77c HX |
17 | #include <net/dst.h> |
| 18 | #include <net/xfrm.h> | |
| 19 | ||
| 83815dea HX |
20 | static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb) |
| 21 | { | |
| 550ade84 HX |
22 | struct dst_entry *dst = skb->dst; |
| 23 | int nhead = dst->header_len + LL_RESERVED_SPACE(dst->dev) | |
| 83815dea HX |
24 | - skb_headroom(skb); |
| 25 | ||
| 26 | if (nhead > 0) | |
| 27 | return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC); | |
| 28 | ||
| 29 | /* Check tail too... */ | |
| 30 | return 0; | |
| 31 | } | |
| 32 | ||
| 33 | static int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb) | |
| 34 | { | |
| 35 | int err = xfrm_state_check_expire(x); | |
| 36 | if (err < 0) | |
| 37 | goto err; | |
| 38 | err = xfrm_state_check_space(x, skb); | |
| 39 | err: | |
| 40 | return err; | |
| 41 | } | |
| 42 | ||
| 406ef77c HX |
43 | int xfrm_output(struct sk_buff *skb) |
| 44 | { | |
| 45 | struct dst_entry *dst = skb->dst; | |
| 46 | struct xfrm_state *x = dst->xfrm; | |
| 47 | int err; | |
| 48 | ||
| 49 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
| 50 | err = skb_checksum_help(skb); | |
| 51 | if (err) | |
| 52 | goto error_nolock; | |
| 53 | } | |
| 54 | ||
| 55 | do { | |
| a2deb6d2 HX |
56 | err = x->outer_mode->output(x, skb); |
| 57 | if (err) | |
| 58 | goto error; | |
| 59 | ||
| 406ef77c HX |
60 | spin_lock_bh(&x->lock); |
| 61 | err = xfrm_state_check(x, skb); | |
| 62 | if (err) | |
| 63 | goto error; | |
| 64 | ||
| 436a0a40 HX |
65 | if (x->type->flags & XFRM_TYPE_REPLAY_PROT) { |
| 66 | XFRM_SKB_CB(skb)->seq = ++x->replay.oseq; | |
| cdf7e668 HX |
67 | if (xfrm_aevent_is_on()) |
| 68 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); | |
| 436a0a40 HX |
69 | } |
| 70 | ||
| 406ef77c HX |
71 | x->curlft.bytes += skb->len; |
| 72 | x->curlft.packets++; | |
| 73 | ||
| 406ef77c HX |
74 | spin_unlock_bh(&x->lock); |
| 75 | ||
| b7c6538c HX |
76 | err = x->type->output(x, skb); |
| 77 | if (err) | |
| 78 | goto error_nolock; | |
| 79 | ||
| 406ef77c HX |
80 | if (!(skb->dst = dst_pop(dst))) { |
| 81 | err = -EHOSTUNREACH; | |
| 82 | goto error_nolock; | |
| 83 | } | |
| 84 | dst = skb->dst; | |
| 85 | x = dst->xfrm; | |
| 13996378 | 86 | } while (x && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL)); |
| 406ef77c HX |
87 | |
| 88 | err = 0; | |
| 89 | ||
| 90 | error_nolock: | |
| 91 | return err; | |
| 92 | error: | |
| 93 | spin_unlock_bh(&x->lock); | |
| 94 | goto error_nolock; | |
| 95 | } | |
| 96 | EXPORT_SYMBOL_GPL(xfrm_output); |