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-rw-r--r--net/ipv4/ah4.c15
-rw-r--r--net/ipv4/esp4.c18
-rw-r--r--net/ipv4/ipcomp.c23
-rw-r--r--net/ipv4/xfrm4_mode_transport.c14
4 files changed, 32 insertions, 38 deletions
diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c
index e2e4771fa4c..c7782230080 100644
--- a/net/ipv4/ah4.c
+++ b/net/ipv4/ah4.c
@@ -119,6 +119,7 @@ error:
static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
{
int ah_hlen;
+ int ihl;
struct iphdr *iph;
struct ip_auth_hdr *ah;
struct ah_data *ahp;
@@ -149,13 +150,14 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
ah = (struct ip_auth_hdr*)skb->data;
iph = skb->nh.iph;
- memcpy(work_buf, iph, iph->ihl*4);
+ ihl = skb->data - skb->nh.raw;
+ memcpy(work_buf, iph, ihl);
iph->ttl = 0;
iph->tos = 0;
iph->frag_off = 0;
iph->check = 0;
- if (iph->ihl != 5) {
+ if (ihl > sizeof(*iph)) {
u32 dummy;
if (ip_clear_mutable_options(iph, &dummy))
goto out;
@@ -164,7 +166,7 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
u8 auth_data[MAX_AH_AUTH_LEN];
memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
- skb_push(skb, skb->data - skb->nh.raw);
+ skb_push(skb, ihl);
ahp->icv(ahp, skb, ah->auth_data);
if (memcmp(ah->auth_data, auth_data, ahp->icv_trunc_len)) {
x->stats.integrity_failed++;
@@ -172,11 +174,8 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
}
}
((struct iphdr*)work_buf)->protocol = ah->nexthdr;
- skb->nh.raw = skb_pull(skb, ah_hlen);
- memcpy(skb->nh.raw, work_buf, iph->ihl*4);
- skb->nh.iph->tot_len = htons(skb->len);
- skb_pull(skb, skb->nh.iph->ihl*4);
- skb->h.raw = skb->data;
+ skb->h.raw = memcpy(skb->nh.raw += ah_hlen, work_buf, ihl);
+ __skb_pull(skb, ah_hlen + ihl);
return 0;
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 9d1881c07a3..9bbdd449455 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -143,10 +143,9 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
int alen = esp->auth.icv_trunc_len;
int elen = skb->len - sizeof(struct ip_esp_hdr) - esp->conf.ivlen - alen;
int nfrags;
- int encap_len = 0;
+ int ihl;
u8 nexthdr[2];
struct scatterlist *sg;
- u8 workbuf[60];
int padlen;
if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr)))
@@ -177,7 +176,6 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
skb->ip_summed = CHECKSUM_NONE;
esph = (struct ip_esp_hdr*)skb->data;
- iph = skb->nh.iph;
/* Get ivec. This can be wrong, check against another impls. */
if (esp->conf.ivlen)
@@ -204,12 +202,12 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
/* ... check padding bits here. Silly. :-) */
+ iph = skb->nh.iph;
+ ihl = iph->ihl * 4;
+
if (x->encap) {
struct xfrm_encap_tmpl *encap = x->encap;
- struct udphdr *uh;
-
- uh = (struct udphdr *)(iph + 1);
- encap_len = (void*)esph - (void*)uh;
+ struct udphdr *uh = (void *)(skb->nh.raw + ihl);
/*
* 1) if the NAT-T peer's IP or port changed then
@@ -246,11 +244,7 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
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);
+ skb->h.raw = __skb_pull(skb, sizeof(*esph) + esp->conf.ivlen) - ihl;
return 0;
diff --git a/net/ipv4/ipcomp.c b/net/ipv4/ipcomp.c
index 95278b22b66..8e243589045 100644
--- a/net/ipv4/ipcomp.c
+++ b/net/ipv4/ipcomp.c
@@ -45,7 +45,6 @@ static LIST_HEAD(ipcomp_tfms_list);
static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb)
{
int err, plen, dlen;
- struct iphdr *iph;
struct ipcomp_data *ipcd = x->data;
u8 *start, *scratch;
struct crypto_tfm *tfm;
@@ -74,8 +73,6 @@ static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb)
skb_put(skb, dlen - plen);
memcpy(skb->data, scratch, dlen);
- iph = skb->nh.iph;
- iph->tot_len = htons(dlen + iph->ihl * 4);
out:
put_cpu();
return err;
@@ -83,14 +80,9 @@ out:
static int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb)
{
- u8 nexthdr;
int err = 0;
struct iphdr *iph;
- union {
- struct iphdr iph;
- char buf[60];
- } tmp_iph;
-
+ struct ip_comp_hdr *ipch;
if ((skb_is_nonlinear(skb) || skb_cloned(skb)) &&
skb_linearize(skb, GFP_ATOMIC) != 0) {
@@ -102,15 +94,10 @@ static int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb)
/* Remove ipcomp header and decompress original payload */
iph = skb->nh.iph;
- memcpy(&tmp_iph, iph, iph->ihl * 4);
- nexthdr = *(u8 *)skb->data;
- skb_pull(skb, sizeof(struct ip_comp_hdr));
- skb->nh.raw += sizeof(struct ip_comp_hdr);
- memcpy(skb->nh.raw, &tmp_iph, tmp_iph.iph.ihl * 4);
- iph = skb->nh.iph;
- iph->tot_len = htons(ntohs(iph->tot_len) - sizeof(struct ip_comp_hdr));
- iph->protocol = nexthdr;
- skb->h.raw = skb->data;
+ ipch = (void *)skb->data;
+ iph->protocol = ipch->nexthdr;
+ skb->h.raw = skb->nh.raw + sizeof(*ipch);
+ __skb_pull(skb, sizeof(*ipch));
err = ipcomp_decompress(x, skb);
out:
diff --git a/net/ipv4/xfrm4_mode_transport.c b/net/ipv4/xfrm4_mode_transport.c
index e46d9a4ccc5..a9e6b3dd19c 100644
--- a/net/ipv4/xfrm4_mode_transport.c
+++ b/net/ipv4/xfrm4_mode_transport.c
@@ -38,8 +38,22 @@ static int xfrm4_transport_output(struct sk_buff *skb)
return 0;
}
+/* Remove encapsulation header.
+ *
+ * The IP header will be moved over the top of the encapsulation header.
+ *
+ * On entry, skb->h shall point to where the IP header should be and skb->nh
+ * shall be set to where the IP header currently is. skb->data shall point
+ * to the start of the payload.
+ */
static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
{
+ int ihl = skb->data - skb->h.raw;
+
+ if (skb->h.raw != skb->nh.raw)
+ skb->nh.raw = memmove(skb->h.raw, skb->nh.raw, ihl);
+ skb->nh.iph->tot_len = htons(skb->len + ihl);
+ skb->h.raw = skb->data;
return 0;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-16 23:37:29 +0000