[SK_BUFF]: Introduce ip_hdr(), remove skb->nh.iph

[safe/jmp/linux-2.6] / net / ipv4 / ipcomp.c

diff --git a/net/ipv4/ipcomp.c b/net/ipv4/ipcomp.c
index aa704b8..8eb4606 100644 (file)
--- 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;