{IPv4,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 getting in.
Signed-off-by: Fan Du <fan.du@windriver.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c
index c6accac..54b965d 100644
--- a/net/ipv4/ah4.c
+++ b/net/ipv4/ah4.c
@@ -309,6 +309,10 @@
struct ip_auth_hdr *ah;
struct ah_data *ahp;
int err = -ENOMEM;
+ int seqhi_len = 0;
+ __be32 *seqhi;
+ int sglists = 0;
+ struct scatterlist *seqhisg;
if (!pskb_may_pull(skb, sizeof(*ah)))
goto out;
@@ -349,14 +353,22 @@
iph = ip_hdr(skb);
ihl = ip_hdrlen(skb);
- work_iph = ah_alloc_tmp(ahash, nfrags, ihl + 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, ihl +
+ ahp->icv_trunc_len + seqhi_len);
if (!work_iph)
goto out;
- auth_data = ah_tmp_auth(work_iph, ihl);
+ seqhi = (__be32 *)((char *)work_iph + ihl);
+ auth_data = ah_tmp_auth(seqhi, seqhi_len);
icv = ah_tmp_icv(ahash, auth_data, ahp->icv_trunc_len);
req = ah_tmp_req(ahash, icv);
sg = ah_req_sg(ahash, req);
+ seqhisg = sg + nfrags;
memcpy(work_iph, iph, ihl);
memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
@@ -375,10 +387,15 @@
skb_push(skb, ihl);
- 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);
- ahash_request_set_crypt(req, sg, icv, 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 + seqhi_len);
ahash_request_set_callback(req, 0, ah_input_done, skb);
AH_SKB_CB(skb)->tmp = work_iph;