netdev - [PATCHv3 net-next] ipv6: allow routes to be configured with expire values

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Message-Id: <3b977653c7ade52e180d754eb660ec66af212e94.1450259411.git.lucien.xin@gmail.com>
Date:	Wed, 16 Dec 2015 17:50:11 +0800
From:	Xin Long <lucien.xin@...il.com>
To:	network dev <netdev@...r.kernel.org>
Cc:	davem@...emloft.net,
	Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: [PATCHv3 net-next] ipv6: allow routes to be configured with expire values

Add the support for adding expire value to routes,  requested by
Tom Gundersen <teg@...m.no> for systemd-networkd, and NetworkManager
wants it too.

implement it by adding the new RTNETLINK attribute RTA_EXPIRES.

Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 include/uapi/linux/rtnetlink.h |  1 +
 net/ipv6/route.c               | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
index 123a5af..ca764b5 100644
--- a/include/uapi/linux/rtnetlink.h
+++ b/include/uapi/linux/rtnetlink.h
@@ -311,6 +311,7 @@ enum rtattr_type_t {
 	RTA_PREF,
 	RTA_ENCAP_TYPE,
 	RTA_ENCAP,
+	RTA_EXPIRES,
 	__RTA_MAX
 };
 
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index c83b6a5..3c8834b 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2709,6 +2709,7 @@ static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
 	[RTA_PREF]              = { .type = NLA_U8 },
 	[RTA_ENCAP_TYPE]	= { .type = NLA_U16 },
 	[RTA_ENCAP]		= { .type = NLA_NESTED },
+	[RTA_EXPIRES]		= { .type = NLA_U32 },
 };
 
 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
@@ -2809,6 +2810,15 @@ static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
 	if (tb[RTA_ENCAP_TYPE])
 		cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
 
+	if (tb[RTA_EXPIRES]) {
+		unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
+
+		if (addrconf_finite_timeout(timeout)) {
+			cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
+			cfg->fc_flags |= RTF_EXPIRES;
+		}
+	}
+
 	err = 0;
 errout:
 	return err;
-- 
2.1.0

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