From 7b277b1a5fb147cb828e5d8b9780cee60f31a9bf Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Wed, 10 Oct 2007 15:44:06 -0700 Subject: [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 Signed-off-by: David S. Miller --- net/ipv4/ah4.c | 1 + net/ipv4/esp4.c | 6 ++---- net/ipv4/ipcomp.c | 1 + net/ipv4/xfrm4_mode_beet.c | 5 +++-- net/ipv4/xfrm4_mode_transport.c | 4 ++-- net/ipv4/xfrm4_mode_tunnel.c | 3 +-- net/ipv4/xfrm4_tunnel.c | 1 + 7 files changed, 11 insertions(+), 10 deletions(-) (limited to 'net/ipv4') diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c index 3513149c3843..dbb1f11721e4 100644 --- a/net/ipv4/ah4.c +++ b/net/ipv4/ah4.c @@ -66,6 +66,7 @@ static int ah_output(struct xfrm_state *x, struct sk_buff *skb) char buf[60]; } tmp_iph; + skb_push(skb, -skb_network_offset(skb)); top_iph = ip_hdr(skb); iph = &tmp_iph.iph; diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c index 1af332df72d9..0f5e8387ccb4 100644 --- a/net/ipv4/esp4.c +++ b/net/ipv4/esp4.c @@ -28,9 +28,7 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb) int alen; int nfrags; - /* Strip IP+ESP header. */ - __skb_pull(skb, skb_transport_offset(skb)); - /* Now skb is pure payload to encrypt */ + /* skb is pure payload to encrypt */ err = -ENOMEM; @@ -60,7 +58,7 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb) tail[clen - skb->len - 2] = (clen - skb->len) - 2; pskb_put(skb, trailer, clen - skb->len); - __skb_push(skb, -skb_network_offset(skb)); + skb_push(skb, -skb_network_offset(skb)); top_iph = ip_hdr(skb); esph = (struct ip_esp_hdr *)(skb_network_header(skb) + top_iph->ihl * 4); diff --git a/net/ipv4/ipcomp.c b/net/ipv4/ipcomp.c index e787044a8514..1929d451dab5 100644 --- a/net/ipv4/ipcomp.c +++ b/net/ipv4/ipcomp.c @@ -134,6 +134,7 @@ static int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb) int hdr_len = 0; struct iphdr *iph = ip_hdr(skb); + skb_push(skb, -skb_network_offset(skb)); iph->tot_len = htons(skb->len); hdr_len = iph->ihl * 4; if ((skb->len - hdr_len) < ipcd->threshold) { diff --git a/net/ipv4/xfrm4_mode_beet.c b/net/ipv4/xfrm4_mode_beet.c index a73e710740c2..77888f596737 100644 --- a/net/ipv4/xfrm4_mode_beet.c +++ b/net/ipv4/xfrm4_mode_beet.c @@ -40,10 +40,11 @@ static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb) if (unlikely(optlen)) hdrlen += IPV4_BEET_PHMAXLEN - (optlen & 4); - skb_push(skb, x->props.header_len - IPV4_BEET_PHMAXLEN + hdrlen); - skb_reset_network_header(skb); + skb_set_network_header(skb, IPV4_BEET_PHMAXLEN - x->props.header_len - + hdrlen); top_iph = ip_hdr(skb); skb->transport_header += sizeof(*iph) - hdrlen; + __skb_pull(skb, sizeof(*iph) - hdrlen); memmove(top_iph, iph, sizeof(*iph)); if (unlikely(optlen)) { diff --git a/net/ipv4/xfrm4_mode_transport.c b/net/ipv4/xfrm4_mode_transport.c index 601047161ea6..10499d2ec65e 100644 --- a/net/ipv4/xfrm4_mode_transport.c +++ b/net/ipv4/xfrm4_mode_transport.c @@ -27,8 +27,8 @@ static int xfrm4_transport_output(struct xfrm_state *x, struct sk_buff *skb) int ihl = iph->ihl * 4; skb->transport_header = skb->network_header + ihl; - skb_push(skb, x->props.header_len); - skb_reset_network_header(skb); + skb_set_network_header(skb, -x->props.header_len); + __skb_pull(skb, ihl); memmove(skb_network_header(skb), iph, ihl); return 0; } diff --git a/net/ipv4/xfrm4_mode_tunnel.c b/net/ipv4/xfrm4_mode_tunnel.c index 9963700e74c1..bac1a91f0cbe 100644 --- a/net/ipv4/xfrm4_mode_tunnel.c +++ b/net/ipv4/xfrm4_mode_tunnel.c @@ -49,8 +49,7 @@ static int xfrm4_tunnel_output(struct xfrm_state *x, struct sk_buff *skb) iph = ip_hdr(skb); skb->transport_header = skb->network_header; - skb_push(skb, x->props.header_len); - skb_reset_network_header(skb); + skb_set_network_header(skb, -x->props.header_len); top_iph = ip_hdr(skb); top_iph->ihl = 5; diff --git a/net/ipv4/xfrm4_tunnel.c b/net/ipv4/xfrm4_tunnel.c index 9275c79119b6..be572f918b5e 100644 --- a/net/ipv4/xfrm4_tunnel.c +++ b/net/ipv4/xfrm4_tunnel.c @@ -14,6 +14,7 @@ static int ipip_output(struct xfrm_state *x, struct sk_buff *skb) { struct iphdr *iph = ip_hdr(skb); + skb_push(skb, -skb_network_offset(skb)); iph->tot_len = htons(skb->len); ip_send_check(iph); -- cgit v1.2.3-59-g8ed1b