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[IPSEC]: Use IPv6 calling convention as the convention for x->mode->output

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The IPv6 calling convention for x->mode->output is more general and could
help an eventual protocol-generic x->type->output implementation.  This
patch adopts it for IPv4 as well and modifies the IPv4 type output functions
accordingly.

It also rewrites the IPv6 mac/transport header calculation to be based off
the network header where practical.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu
2007-10-10 15:44:44 -07:00
committed by David S. Miller
parent 7b277b1a5f
commit 37fedd3aab
11 changed files with 44 additions and 67 deletions
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17
net/ipv4/xfrm4_mode_beet.c
View File

@ -23,17 +23,14 @@
* The following fields in it shall be filled in by x->type->output:
* tot_len
* check
*
* On exit, skb->h will be set to the start of the payload to be processed
* by x->type->output and skb->nh will be set to the top IP header.
*/
static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb)
{
struct ip_beet_phdr *ph;
struct iphdr *iph, *top_iph;
int hdrlen, optlen;
iph = ip_hdr(skb);
skb->transport_header = skb->network_header;
hdrlen = 0;
optlen = iph->ihl * 4 - sizeof(*iph);
@ -42,17 +39,17 @@ static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *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);
skb->mac_header = skb->network_header +
offsetof(struct iphdr, protocol);
skb->transport_header = skb->network_header + sizeof(*iph);
ph = (struct ip_beet_phdr *)__skb_pull(skb, sizeof(*iph) - hdrlen);
top_iph = ip_hdr(skb);
memmove(top_iph, iph, sizeof(*iph));
if (unlikely(optlen)) {
struct ip_beet_phdr *ph;
BUG_ON(optlen < 0);
ph = (struct ip_beet_phdr *)skb_transport_header(skb);
ph->padlen = 4 - (optlen & 4);
ph->hdrlen = optlen / 8;
ph->nexthdr = top_iph->protocol;