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path: root/net/ipv4/esp4.c
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Diffstat (limited to 'net/ipv4/esp4.c')
-rw-r--r--net/ipv4/esp4.c87
1 files changed, 43 insertions, 44 deletions
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 73bfcae8af9..3f47419cb9c 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -150,6 +150,10 @@ static int esp_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struc
int elen = skb->len - sizeof(struct ip_esp_hdr) - esp->conf.ivlen - alen;
int nfrags;
int encap_len = 0;
+ u8 nexthdr[2];
+ struct scatterlist *sg;
+ u8 workbuf[60];
+ int padlen;
if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr)))
goto out;
@@ -185,61 +189,56 @@ static int esp_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struc
if (esp->conf.ivlen)
crypto_cipher_set_iv(esp->conf.tfm, esph->enc_data, crypto_tfm_alg_ivsize(esp->conf.tfm));
- {
- u8 nexthdr[2];
- struct scatterlist *sg = &esp->sgbuf[0];
- u8 workbuf[60];
- int padlen;
+ sg = &esp->sgbuf[0];
- if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
- sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
- if (!sg)
- goto out;
- }
- skb_to_sgvec(skb, sg, sizeof(struct ip_esp_hdr) + esp->conf.ivlen, elen);
- crypto_cipher_decrypt(esp->conf.tfm, sg, sg, elen);
- if (unlikely(sg != &esp->sgbuf[0]))
- kfree(sg);
+ if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
+ sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
+ if (!sg)
+ goto out;
+ }
+ skb_to_sgvec(skb, sg, sizeof(struct ip_esp_hdr) + esp->conf.ivlen, elen);
+ crypto_cipher_decrypt(esp->conf.tfm, sg, sg, elen);
+ if (unlikely(sg != &esp->sgbuf[0]))
+ kfree(sg);
- if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
- BUG();
+ if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
+ BUG();
- padlen = nexthdr[0];
- if (padlen+2 >= elen)
- goto out;
+ padlen = nexthdr[0];
+ if (padlen+2 >= elen)
+ goto out;
- /* ... check padding bits here. Silly. :-) */
+ /* ... check padding bits here. Silly. :-) */
- if (x->encap && decap && decap->decap_type) {
- struct esp_decap_data *encap_data;
- struct udphdr *uh = (struct udphdr *) (iph+1);
+ if (x->encap && decap && decap->decap_type) {
+ struct esp_decap_data *encap_data;
+ struct udphdr *uh = (struct udphdr *) (iph+1);
- encap_data = (struct esp_decap_data *) (decap->decap_data);
- encap_data->proto = 0;
+ encap_data = (struct esp_decap_data *) (decap->decap_data);
+ encap_data->proto = 0;
- switch (decap->decap_type) {
- case UDP_ENCAP_ESPINUDP:
- case UDP_ENCAP_ESPINUDP_NON_IKE:
- encap_data->proto = AF_INET;
- encap_data->saddr.a4 = iph->saddr;
- encap_data->sport = uh->source;
- encap_len = (void*)esph - (void*)uh;
- break;
+ switch (decap->decap_type) {
+ case UDP_ENCAP_ESPINUDP:
+ case UDP_ENCAP_ESPINUDP_NON_IKE:
+ encap_data->proto = AF_INET;
+ encap_data->saddr.a4 = iph->saddr;
+ encap_data->sport = uh->source;
+ encap_len = (void*)esph - (void*)uh;
+ break;
- default:
- goto out;
- }
+ default:
+ goto out;
}
-
- iph->protocol = nexthdr[1];
- pskb_trim(skb, skb->len - alen - padlen - 2);
- memcpy(workbuf, skb->nh.raw, iph->ihl*4);
- skb->h.raw = skb_pull(skb, sizeof(struct ip_esp_hdr) + esp->conf.ivlen);
- skb->nh.raw += encap_len + sizeof(struct ip_esp_hdr) + esp->conf.ivlen;
- memcpy(skb->nh.raw, workbuf, iph->ihl*4);
- skb->nh.iph->tot_len = htons(skb->len);
}
+ iph->protocol = nexthdr[1];
+ pskb_trim(skb, skb->len - alen - padlen - 2);
+ memcpy(workbuf, skb->nh.raw, iph->ihl*4);
+ skb->h.raw = skb_pull(skb, sizeof(struct ip_esp_hdr) + esp->conf.ivlen);
+ skb->nh.raw += encap_len + sizeof(struct ip_esp_hdr) + esp->conf.ivlen;
+ memcpy(skb->nh.raw, workbuf, iph->ihl*4);
+ skb->nh.iph->tot_len = htons(skb->len);
+
return 0;
out: