From eddc9ec53be2ecdbf4efe0efd4a83052594f0ac0 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Fri, 20 Apr 2007 22:47:35 -0700 Subject: [SK_BUFF]: Introduce ip_hdr(), remove skb->nh.iph Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: David S. Miller --- net/ipv4/ipcomp.c | 50 ++++++++++++++++++-------------------------------- 1 file changed, 18 insertions(+), 32 deletions(-) (limited to 'net/ipv4/ipcomp.c') diff --git a/net/ipv4/ipcomp.c b/net/ipv4/ipcomp.c index aa704b88f014..8eb46064c525 100644 --- a/net/ipv4/ipcomp.c +++ b/net/ipv4/ipcomp.c @@ -43,21 +43,15 @@ static LIST_HEAD(ipcomp_tfms_list); static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb) { - int err, plen, dlen; struct ipcomp_data *ipcd = x->data; - u8 *start, *scratch; - struct crypto_comp *tfm; - int cpu; - - plen = skb->len; - dlen = IPCOMP_SCRATCH_SIZE; - start = skb->data; + const int plen = skb->len; + int dlen = IPCOMP_SCRATCH_SIZE; + const u8 *start = skb->data; + const int cpu = get_cpu(); + u8 *scratch = *per_cpu_ptr(ipcomp_scratches, cpu); + struct crypto_comp *tfm = *per_cpu_ptr(ipcd->tfms, cpu); + int err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen); - cpu = get_cpu(); - scratch = *per_cpu_ptr(ipcomp_scratches, cpu); - tfm = *per_cpu_ptr(ipcd->tfms, cpu); - - err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen); if (err) goto out; @@ -90,7 +84,7 @@ static int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb) skb->ip_summed = CHECKSUM_NONE; /* Remove ipcomp header and decompress original payload */ - iph = skb->nh.iph; + iph = ip_hdr(skb); ipch = (void *)skb->data; iph->protocol = ipch->nexthdr; skb->h.raw = skb->nh.raw + sizeof(*ipch); @@ -103,23 +97,16 @@ out: static int ipcomp_compress(struct xfrm_state *x, struct sk_buff *skb) { - int err, plen, dlen, ihlen; - struct iphdr *iph = skb->nh.iph; struct ipcomp_data *ipcd = x->data; - u8 *start, *scratch; - struct crypto_comp *tfm; - int cpu; + const int ihlen = ip_hdrlen(skb); + const int plen = skb->len - ihlen; + int dlen = IPCOMP_SCRATCH_SIZE; + u8 *start = skb->data + ihlen; + const int cpu = get_cpu(); + u8 *scratch = *per_cpu_ptr(ipcomp_scratches, cpu); + struct crypto_comp *tfm = *per_cpu_ptr(ipcd->tfms, cpu); + int err = crypto_comp_compress(tfm, start, plen, scratch, &dlen); - ihlen = iph->ihl * 4; - plen = skb->len - ihlen; - dlen = IPCOMP_SCRATCH_SIZE; - start = skb->data + ihlen; - - cpu = get_cpu(); - scratch = *per_cpu_ptr(ipcomp_scratches, cpu); - tfm = *per_cpu_ptr(ipcd->tfms, cpu); - - err = crypto_comp_compress(tfm, start, plen, scratch, &dlen); if (err) goto out; @@ -142,12 +129,11 @@ out: static int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb) { int err; - struct iphdr *iph; struct ip_comp_hdr *ipch; struct ipcomp_data *ipcd = x->data; int hdr_len = 0; + struct iphdr *iph = ip_hdr(skb); - iph = skb->nh.iph; iph->tot_len = htons(skb->len); hdr_len = iph->ihl * 4; if ((skb->len - hdr_len) < ipcd->threshold) { @@ -159,7 +145,7 @@ static int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb) goto out_ok; err = ipcomp_compress(x, skb); - iph = skb->nh.iph; + iph = ip_hdr(skb); if (err) { goto out_ok; -- cgit v1.2.3-59-g8ed1b