From mboxrd@z Thu Jan 1 00:00:00 1970 From: Fan Du Subject: [PATCH net-next 2/3] {IPv4,xfrm} Add Extended Sequence Number (ESN) support for AH ingress part Date: Wed, 8 Jan 2014 16:53:11 +0800 Message-ID: <1389171192-28091-3-git-send-email-fan.du@windriver.com> References: <1389171192-28091-1-git-send-email-fan.du@windriver.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , To: Return-path: Received: from mail1.windriver.com ([147.11.146.13]:63721 "EHLO mail1.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756623AbaAHIxT (ORCPT ); Wed, 8 Jan 2014 03:53:19 -0500 In-Reply-To: <1389171192-28091-1-git-send-email-fan.du@windriver.com> Sender: netdev-owner@vger.kernel.org List-ID: 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 --- net/ipv4/ah4.c | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c index a7fac03..169d9a5 100644 --- a/net/ipv4/ah4.c +++ b/net/ipv4/ah4.c @@ -312,6 +312,10 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb) 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; @@ -352,14 +356,21 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb) 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); @@ -381,7 +392,14 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb) sg_init_table(sg, nfrags); skb_to_sgvec(skb, sg, 0, skb->len); - ahash_request_set_crypt(req, sg, icv, skb->len); + if ((x->props.flags & XFRM_STATE_ESN)) { + sg_unmark_end(&sg[nfrags - 1]); + /* Attach seqhi sg right after packet payload */ + *seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi); + sg_init_table(seqhisg, sglists); + 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; -- 1.7.9.5