net: RTA_MARK addition

Add a new rt attribute, RTA_MARK, and use it in
rt_fill_info()/inet_rtm_getroute() to support following commands :

ip route get 192.168.20.110 mark NUMBER
ip route get 192.168.20.108 from 192.168.20.110 iif eth1 mark NUMBER
ip route list cache [192.168.20.110] mark NUMBER

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 8 insertions, 0 deletions

diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index fbc8cb0d48c3..58d44491880f 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -282,6 +282,7 @@ enum rtattr_type_t {
         RTA_SESSION, /* no longer used */
         RTA_MP_ALGO, /* no longer used */
         RTA_TABLE,
+        RTA_MARK,
         __RTA_MAX
 };
 
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 562ce92de2a6..3f56b6e6c6aa 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2878,6 +2878,9 @@ static int rt_fill_info(struct net *net,
         if (rtnetlink_put_metrics(skb, rt->dst.metrics) < 0)
                 goto nla_put_failure;
 
+        if (rt->fl.mark)
+                NLA_PUT_BE32(skb, RTA_MARK, rt->fl.mark);
+
         error = rt->dst.error;
         expires = rt->dst.expires ? rt->dst.expires - jiffies : 0;
         if (rt->peer) {
@@ -2933,6 +2936,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void
         __be32 src = 0;
         u32 iif;
         int err;
+        int mark;
         struct sk_buff *skb;
 
         err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy);
@@ -2960,6 +2964,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void
         src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0;
         dst = tb[RTA_DST] ? nla_get_be32(tb[RTA_DST]) : 0;
         iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0;
+        mark = tb[RTA_MARK] ? nla_get_u32(tb[RTA_MARK]) : 0;
 
         if (iif) {
                 struct net_device *dev;
@@ -2972,6 +2977,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void
 
                 skb->protocol   = htons(ETH_P_IP);
                 skb->dev        = dev;
+                skb->mark       = mark;
                 local_bh_disable();
                 err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev);
                 local_bh_enable();
@@ -2989,6 +2995,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void
                                 },
                         },
                         .oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0,
+                        .mark = mark,
                 };
                 err = ip_route_output_key(net, &rt, &fl);
         }