diff options
Diffstat (limited to 'net/ipv4/xfrm4_output.c')
| -rw-r--r-- | net/ipv4/xfrm4_output.c | 71 |
1 files changed, 54 insertions, 17 deletions
diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c index 66620a95942a..51fabb8f7c54 100644 --- a/net/ipv4/xfrm4_output.c +++ b/net/ipv4/xfrm4_output.c @@ -8,8 +8,10 @@ * 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/netfilter_ipv4.h> #include <net/inet_ecn.h> #include <net/ip.h> #include <net/xfrm.h> @@ -95,7 +97,7 @@ out: return ret; } -int xfrm4_output(struct sk_buff *skb) +static int xfrm4_output_one(struct sk_buff *skb) { struct dst_entry *dst = skb->dst; struct xfrm_state *x = dst->xfrm; @@ -113,27 +115,32 @@ int xfrm4_output(struct sk_buff *skb) goto error_nolock; } - spin_lock_bh(&x->lock); - err = xfrm_state_check(x, skb); - if (err) - goto error; + do { + spin_lock_bh(&x->lock); + err = xfrm_state_check(x, skb); + if (err) + goto error; - xfrm4_encap(skb); + xfrm4_encap(skb); - err = x->type->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++; + x->curlft.bytes += skb->len; + x->curlft.packets++; - spin_unlock_bh(&x->lock); + spin_unlock_bh(&x->lock); - if (!(skb->dst = dst_pop(dst))) { - err = -EHOSTUNREACH; - goto error_nolock; - } - err = NET_XMIT_BYPASS; + if (!(skb->dst = dst_pop(dst))) { + err = -EHOSTUNREACH; + goto error_nolock; + } + dst = skb->dst; + x = dst->xfrm; + } while (x && !x->props.mode); + + err = 0; out_exit: return err; @@ -143,3 +150,33 @@ error_nolock: kfree_skb(skb); goto out_exit; } + +static int xfrm4_output_finish(struct sk_buff *skb) +{ + int err; + + while (likely((err = xfrm4_output_one(skb)) == 0)) { + nf_reset(skb); + + err = nf_hook(PF_INET, NF_IP_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_INET, NF_IP_POST_ROUTING, &skb, NULL, + skb->dst->dev, xfrm4_output_finish); + if (unlikely(err != 1)) + break; + } + + return err; +} + +int xfrm4_output(struct sk_buff *skb) +{ + return NF_HOOK(PF_INET, NF_IP_POST_ROUTING, skb, NULL, skb->dst->dev, + xfrm4_output_finish); +} |