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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2007-10-10 15:44:06 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-10-10 16:55:54 -0700 |
| commit | 7b277b1a5fb147cb828e5d8b9780cee60f31a9bf (patch) | |
| tree | 21af4818d7ba9d646a281517f476d81d4245cc30 /net/ipv6/xfrm6_mode_beet.c | |
| parent | bee0b40c0621396326d1c17b81833f59118a2d80 (diff) | |
| download | linux-7b277b1a5fb147cb828e5d8b9780cee60f31a9bf.tar.gz linux-7b277b1a5fb147cb828e5d8b9780cee60f31a9bf.tar.bz2 linux-7b277b1a5fb147cb828e5d8b9780cee60f31a9bf.zip | |
[IPSEC]: Set skb->data to payload in x->mode->output
This patch changes the calling convention so that on entry from
x->mode->output and before entry into x->type->output skb->data
will point to the payload instead of the IP header.
This is essentially a redistribution of skb_push/skb_pull calls
with the aim of minimising them on the common path of tunnel +
ESP.
It'll also let us use the same calling convention between IPv4
and IPv6 with the next patch.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/xfrm6_mode_beet.c')
| -rw-r--r-- | net/ipv6/xfrm6_mode_beet.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/net/ipv6/xfrm6_mode_beet.c b/net/ipv6/xfrm6_mode_beet.c index d9366dfbf868..bca018d19ec6 100644 --- a/net/ipv6/xfrm6_mode_beet.c +++ b/net/ipv6/xfrm6_mode_beet.c @@ -29,8 +29,8 @@ * filled in by x->type->output and the mac header will be set to the * nextheader field of the extension header directly preceding the * encapsulation header, or in its absence, that of the top IP header. - * The value of skb->data and the network header will always point to the - * top IP header. + * The value of the network header will always point to the top IP header + * while skb->data will point to the payload. */ static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb) { @@ -38,16 +38,17 @@ static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb) u8 *prevhdr; int hdr_len; - skb_push(skb, x->props.header_len); iph = ipv6_hdr(skb); hdr_len = ip6_find_1stfragopt(skb, &prevhdr); - memmove(skb->data, iph, hdr_len); skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data); - skb_reset_network_header(skb); - skb_set_transport_header(skb, hdr_len); + skb_set_network_header(skb, -x->props.header_len); + skb_set_transport_header(skb, hdr_len - x->props.header_len); + __skb_pull(skb, hdr_len); + top_iph = ipv6_hdr(skb); + memmove(top_iph, iph, hdr_len); ipv6_addr_copy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr); ipv6_addr_copy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr); |