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authorFan Du <fan.du@windriver.com>2014-01-18 02:54:27 +0100
committerSteffen Klassert <steffen.klassert@secunet.com>2014-02-12 07:02:11 +0100
commit8d6da6f325572664107601a3c9782f8c23c1bfc5 (patch)
tree44f249e7182fd812ae4261083d6d61d50a201b4b /net/ipv6/ah6.c
parent{IPv6,xfrm} Add ESN support for AH egress part (diff)
downloadlinux-8d6da6f325572664107601a3c9782f8c23c1bfc5.tar.xz
linux-8d6da6f325572664107601a3c9782f8c23c1bfc5.zip
{IPv6,xfrm} Add ESN support for AH ingress part
This patch add esn support for AH input stage by attaching upper 32bits sequence number right after packet payload as specified by RFC 4302. Then the ICV value will guard upper 32bits sequence number as well when packet going in. Signed-off-by: Fan Du <fan.du@windriver.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to '')
-rw-r--r--net/ipv6/ah6.c30
1 files changed, 24 insertions, 6 deletions
diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index 89298124c136..6c5f0949e0ab 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -530,6 +530,10 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
int nexthdr;
int nfrags;
int err = -ENOMEM;
+ int seqhi_len = 0;
+ __be32 *seqhi;
+ int sglists = 0;
+ struct scatterlist *seqhisg;
if (!pskb_may_pull(skb, sizeof(struct ip_auth_hdr)))
goto out;
@@ -566,14 +570,22 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
skb_push(skb, hdr_len);
- work_iph = ah_alloc_tmp(ahash, nfrags, hdr_len + ahp->icv_trunc_len);
+ if (x->props.flags & XFRM_STATE_ESN) {
+ sglists = 1;
+ seqhi_len = sizeof(*seqhi);
+ }
+
+ work_iph = ah_alloc_tmp(ahash, nfrags + sglists, hdr_len +
+ ahp->icv_trunc_len + seqhi_len);
if (!work_iph)
goto out;
- auth_data = ah_tmp_auth(work_iph, hdr_len);
- icv = ah_tmp_icv(ahash, auth_data, ahp->icv_trunc_len);
+ auth_data = ah_tmp_auth((u8 *)work_iph, hdr_len);
+ seqhi = (__be32 *)(auth_data + ahp->icv_trunc_len);
+ icv = ah_tmp_icv(ahash, seqhi, seqhi_len);
req = ah_tmp_req(ahash, icv);
sg = ah_req_sg(ahash, req);
+ seqhisg = sg + nfrags;
memcpy(work_iph, ip6h, hdr_len);
memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
@@ -588,10 +600,16 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
ip6h->flow_lbl[2] = 0;
ip6h->hop_limit = 0;
- sg_init_table(sg, nfrags);
- skb_to_sgvec(skb, sg, 0, skb->len);
+ sg_init_table(sg, nfrags + sglists);
+ skb_to_sgvec_nomark(skb, sg, 0, skb->len);
+
+ if (x->props.flags & XFRM_STATE_ESN) {
+ /* Attach seqhi sg right after packet payload */
+ *seqhi = XFRM_SKB_CB(skb)->seq.input.hi;
+ sg_set_buf(seqhisg, seqhi, seqhi_len);
+ }
- ahash_request_set_crypt(req, sg, icv, skb->len);
+ ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len);
ahash_request_set_callback(req, 0, ah6_input_done, skb);
AH_SKB_CB(skb)->tmp = work_iph;