From 668dc8af3150f837f7f0461001bbbc0ce25d7bdf Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Sun, 16 Dec 2007 15:55:02 -0800 Subject: [PATCH] [IPSEC]: Move integrity stat collection into xfrm_input Similar to the moving out of the replay processing on the output, this patch moves the integrity stat collectin from x->type->input into xfrm_input. This would eventually allow transforms such as AH/ESP to be lockless. The error value EBADMSG (currently unused in the crypto layer) is used to indicate a failed integrity check. In future this error can be directly returned by the crypto layer once we switch to aead algorithms. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- net/ipv4/ah4.c | 3 +-- net/ipv4/esp4.c | 13 ++++++++----- net/ipv6/ah6.c | 3 +-- net/ipv6/esp6.c | 3 +-- net/xfrm/xfrm_input.c | 5 ++++- 5 files changed, 15 insertions(+), 12 deletions(-) diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c index 5fc346d8b5..a989d29b44 100644 --- a/net/ipv4/ah4.c +++ b/net/ipv4/ah4.c @@ -177,9 +177,8 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb) err = ah_mac_digest(ahp, skb, ah->auth_data); if (err) goto out; - err = -EINVAL; if (memcmp(ahp->work_icv, auth_data, ahp->icv_trunc_len)) { - x->stats.integrity_failed++; + err = -EBADMSG; goto out; } } diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c index 1738113268..3350a7d506 100644 --- a/net/ipv4/esp4.c +++ b/net/ipv4/esp4.c @@ -163,7 +163,7 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb) u8 nexthdr[2]; struct scatterlist *sg; int padlen; - int err; + int err = -EINVAL; if (!pskb_may_pull(skb, sizeof(*esph))) goto out; @@ -183,13 +183,14 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb) BUG(); if (unlikely(memcmp(esp->auth.work_icv, sum, alen))) { - x->stats.integrity_failed++; + err = -EBADMSG; goto out; } } - if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0) + if ((err = skb_cow_data(skb, 0, &trailer)) < 0) goto out; + nfrags = err; skb->ip_summed = CHECKSUM_NONE; @@ -202,6 +203,7 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb) sg = &esp->sgbuf[0]; if (unlikely(nfrags > ESP_NUM_FAST_SG)) { + err = -ENOMEM; sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC); if (!sg) goto out; @@ -214,11 +216,12 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb) if (unlikely(sg != &esp->sgbuf[0])) kfree(sg); if (unlikely(err)) - return err; + goto out; if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2)) BUG(); + err = -EINVAL; padlen = nexthdr[0]; if (padlen+2 >= elen) goto out; @@ -276,7 +279,7 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb) return nexthdr[1]; out: - return -EINVAL; + return err; } static u32 esp4_get_mtu(struct xfrm_state *x, int mtu) diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c index 4eaf55072b..d4b59ecb0b 100644 --- a/net/ipv6/ah6.c +++ b/net/ipv6/ah6.c @@ -379,10 +379,9 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb) err = ah_mac_digest(ahp, skb, ah->auth_data); if (err) goto free_out; - err = -EINVAL; if (memcmp(ahp->work_icv, auth_data, ahp->icv_trunc_len)) { LIMIT_NETDEBUG(KERN_WARNING "ipsec ah authentication error\n"); - x->stats.integrity_failed++; + err = -EBADMSG; goto free_out; } } diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c index 4440532546..096974ba64 100644 --- a/net/ipv6/esp6.c +++ b/net/ipv6/esp6.c @@ -177,8 +177,7 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb) BUG(); if (unlikely(memcmp(esp->auth.work_icv, sum, alen))) { - x->stats.integrity_failed++; - ret = -EINVAL; + ret = -EBADMSG; goto out; } } diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c index 587f3474ed..b7d68eb943 100644 --- a/net/xfrm/xfrm_input.c +++ b/net/xfrm/xfrm_input.c @@ -147,8 +147,11 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) goto drop_unlock; nexthdr = x->type->input(x, skb); - if (nexthdr <= 0) + if (nexthdr <= 0) { + if (nexthdr == -EBADMSG) + x->stats.integrity_failed++; goto drop_unlock; + } skb_network_header(skb)[nhoff] = nexthdr; -- 2.39.5