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Diffstat (limited to 'net/ipv4/esp4.c')
-rw-r--r--net/ipv4/esp4.c66
1 files changed, 28 insertions, 38 deletions
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 98767a4f1185..6b1a31a74cf2 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -8,6 +8,7 @@
#include <linux/kernel.h>
#include <linux/pfkeyv2.h>
#include <linux/random.h>
+#include <linux/spinlock.h>
#include <net/icmp.h>
#include <net/protocol.h>
#include <net/udp.h>
@@ -15,7 +16,6 @@
static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
{
int err;
- struct iphdr *top_iph;
struct ip_esp_hdr *esph;
struct crypto_blkcipher *tfm;
struct blkcipher_desc desc;
@@ -27,9 +27,7 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
int alen;
int nfrags;
- /* Strip IP+ESP header. */
- __skb_pull(skb, skb_transport_offset(skb));
- /* Now skb is pure payload to encrypt */
+ /* skb is pure payload to encrypt */
err = -ENOMEM;
@@ -59,12 +57,12 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
tail[clen - skb->len - 2] = (clen - skb->len) - 2;
pskb_put(skb, trailer, clen - skb->len);
- __skb_push(skb, skb->data - skb_network_header(skb));
- top_iph = ip_hdr(skb);
- esph = (struct ip_esp_hdr *)(skb_network_header(skb) +
- top_iph->ihl * 4);
- top_iph->tot_len = htons(skb->len + alen);
- *(skb_tail_pointer(trailer) - 1) = top_iph->protocol;
+ skb_push(skb, -skb_network_offset(skb));
+ esph = ip_esp_hdr(skb);
+ *(skb_tail_pointer(trailer) - 1) = *skb_mac_header(skb);
+ *skb_mac_header(skb) = IPPROTO_ESP;
+
+ spin_lock_bh(&x->lock);
/* this is non-NULL only with UDP Encapsulation */
if (x->encap) {
@@ -75,7 +73,7 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
uh = (struct udphdr *)esph;
uh->source = encap->encap_sport;
uh->dest = encap->encap_dport;
- uh->len = htons(skb->len + alen - top_iph->ihl*4);
+ uh->len = htons(skb->len + alen - skb_transport_offset(skb));
uh->check = 0;
switch (encap->encap_type) {
@@ -90,13 +88,11 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
break;
}
- top_iph->protocol = IPPROTO_UDP;
- } else
- top_iph->protocol = IPPROTO_ESP;
+ *skb_mac_header(skb) = IPPROTO_UDP;
+ }
esph->spi = x->id.spi;
- esph->seq_no = htonl(++x->replay.oseq);
- xfrm_aevent_doreplay(x);
+ esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq);
if (esp->conf.ivlen) {
if (unlikely(!esp->conf.ivinitted)) {
@@ -112,7 +108,7 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
if (!sg)
- goto error;
+ goto unlock;
}
skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen);
err = crypto_blkcipher_encrypt(&desc, sg, sg, clen);
@@ -121,7 +117,7 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
} while (0);
if (unlikely(err))
- goto error;
+ goto unlock;
if (esp->conf.ivlen) {
memcpy(esph->enc_data, esp->conf.ivec, esp->conf.ivlen);
@@ -134,7 +130,8 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
memcpy(pskb_put(skb, trailer, alen), esp->auth.work_icv, alen);
}
- ip_send_check(top_iph);
+unlock:
+ spin_unlock_bh(&x->lock);
error:
return err;
@@ -155,7 +152,7 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
struct sk_buff *trailer;
int blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
int alen = esp->auth.icv_trunc_len;
- int elen = skb->len - sizeof(struct ip_esp_hdr) - esp->conf.ivlen - alen;
+ int elen = skb->len - sizeof(*esph) - esp->conf.ivlen - alen;
int nfrags;
int ihl;
u8 nexthdr[2];
@@ -163,7 +160,7 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
int padlen;
int err;
- if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr)))
+ if (!pskb_may_pull(skb, sizeof(*esph)))
goto out;
if (elen <= 0 || (elen & (blksize-1)))
@@ -191,7 +188,7 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
skb->ip_summed = CHECKSUM_NONE;
- esph = (struct ip_esp_hdr*)skb->data;
+ esph = (struct ip_esp_hdr *)skb->data;
/* Get ivec. This can be wrong, check against another impls. */
if (esp->conf.ivlen)
@@ -204,7 +201,7 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
if (!sg)
goto out;
}
- skb_to_sgvec(skb, sg, sizeof(struct ip_esp_hdr) + esp->conf.ivlen, elen);
+ skb_to_sgvec(skb, sg, sizeof(*esph) + esp->conf.ivlen, elen);
err = crypto_blkcipher_decrypt(&desc, sg, sg, elen);
if (unlikely(sg != &esp->sgbuf[0]))
kfree(sg);
@@ -256,17 +253,15 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
* as per draft-ietf-ipsec-udp-encaps-06,
* section 3.1.2
*/
- if (x->props.mode == XFRM_MODE_TRANSPORT ||
- x->props.mode == XFRM_MODE_BEET)
+ if (x->props.mode == XFRM_MODE_TRANSPORT)
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
- iph->protocol = nexthdr[1];
pskb_trim(skb, skb->len - alen - padlen - 2);
__skb_pull(skb, sizeof(*esph) + esp->conf.ivlen);
skb_set_transport_header(skb, -ihl);
- return 0;
+ return nexthdr[1];
out:
return -EINVAL;
@@ -343,11 +338,6 @@ static int esp_init_state(struct xfrm_state *x)
struct crypto_blkcipher *tfm;
u32 align;
- /* null auth and encryption can have zero length keys */
- if (x->aalg) {
- if (x->aalg->alg_key_len > 512)
- goto error;
- }
if (x->ealg == NULL)
goto error;
@@ -359,15 +349,14 @@ static int esp_init_state(struct xfrm_state *x)
struct xfrm_algo_desc *aalg_desc;
struct crypto_hash *hash;
- esp->auth.key = x->aalg->alg_key;
- esp->auth.key_len = (x->aalg->alg_key_len+7)/8;
hash = crypto_alloc_hash(x->aalg->alg_name, 0,
CRYPTO_ALG_ASYNC);
if (IS_ERR(hash))
goto error;
esp->auth.tfm = hash;
- if (crypto_hash_setkey(hash, esp->auth.key, esp->auth.key_len))
+ if (crypto_hash_setkey(hash, x->aalg->alg_key,
+ (x->aalg->alg_key_len + 7) / 8))
goto error;
aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
@@ -389,8 +378,7 @@ static int esp_init_state(struct xfrm_state *x)
if (!esp->auth.work_icv)
goto error;
}
- esp->conf.key = x->ealg->alg_key;
- esp->conf.key_len = (x->ealg->alg_key_len+7)/8;
+
tfm = crypto_alloc_blkcipher(x->ealg->alg_name, 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(tfm))
goto error;
@@ -403,7 +391,8 @@ static int esp_init_state(struct xfrm_state *x)
goto error;
esp->conf.ivinitted = 0;
}
- if (crypto_blkcipher_setkey(tfm, esp->conf.key, esp->conf.key_len))
+ if (crypto_blkcipher_setkey(tfm, x->ealg->alg_key,
+ (x->ealg->alg_key_len + 7) / 8))
goto error;
x->props.header_len = sizeof(struct ip_esp_hdr) + esp->conf.ivlen;
if (x->props.mode == XFRM_MODE_TUNNEL)
@@ -443,6 +432,7 @@ static struct xfrm_type esp_type =
.description = "ESP4",
.owner = THIS_MODULE,
.proto = IPPROTO_ESP,
+ .flags = XFRM_TYPE_REPLAY_PROT,
.init_state = esp_init_state,
.destructor = esp_destroy,
.get_mtu = esp4_get_mtu,
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-19 05:31:48 +0000