netdev - [PATCH v3 iproute2 -next 2/2] ipxfrm: allow to setup filter when dumping SA

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Message-Id: <1395310577-10901-2-git-send-email-nicolas.dichtel@6wind.com>
Date:	Thu, 20 Mar 2014 11:16:17 +0100
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	shemminger@...tta.com
Cc:	netdev@...r.kernel.org, Nicolas Dichtel <nicolas.dichtel@...nd.com>
Subject: [PATCH v3 iproute2 -next 2/2] ipxfrm: allow to setup filter when dumping SA

It's now possible to filter SA directly into the kernel by specifying
XFRMA_PROTO and/or XFRMA_ADDRESS_FILTER.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
---
Note that this patch is intended to work with net-next.

v3: use C99 initializers

 ip/xfrm_state.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/ip/xfrm_state.c b/ip/xfrm_state.c
index 140a4503b799..0cd5c2f43065 100644
--- a/ip/xfrm_state.c
+++ b/ip/xfrm_state.c
@@ -1136,7 +1136,32 @@ static int xfrm_state_list_or_deleteall(int argc, char **argv, int deleteall)
 		}
 
 	} else {
-		if (rtnl_wilddump_request(&rth, preferred_family, XFRM_MSG_GETSA) < 0) {
+		struct xfrm_address_filter addrfilter = {
+			.saddr = filter.xsinfo.saddr,
+			.daddr = filter.xsinfo.id.daddr,
+			.family = filter.xsinfo.family,
+			.splen = filter.id_src_mask,
+			.dplen = filter.id_dst_mask,
+		};
+		struct {
+			struct nlmsghdr n;
+			char buf[NLMSG_BUF_SIZE];
+		} req;
+
+		memset(&req, 0, sizeof(req));
+		req.n.nlmsg_len = NLMSG_HDRLEN;
+		req.n.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST;
+		req.n.nlmsg_type = XFRM_MSG_GETSA;
+		req.n.nlmsg_pid = 0;
+		req.n.nlmsg_seq = rth.dump = ++rth.seq;
+
+		if (filter.xsinfo.id.proto)
+			addattr8(&req.n, sizeof(req), XFRMA_PROTO,
+				 filter.xsinfo.id.proto);
+		addattr_l(&req.n, sizeof(req), XFRMA_ADDRESS_FILTER,
+			  &addrfilter, sizeof(addrfilter));
+
+		if (rtnl_send(&rth, (void *)&req, req.n.nlmsg_len) < 0) {
 			perror("Cannot send dump request");
 			exit(1);
 		}
-- 
1.8.5.4

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