[PATCH net-next 7/9] net: Add routes to the table associated with the device

[David Ahern]

When a device associated with a VRF is brought up or down routes
should be added to/removed from the table associated with the VRF.
fib_magic defaults to using the main or local tables. Have it use
the table with the device if there is one.

A part of this is directing prefsrc validations to the correct
table as well.

Signed-off-by: David Ahern <d...@cumulusnetworks.com>
---
 net/ipv4/fib_frontend.c  |  8 ++++----
 net/ipv4/fib_semantics.c | 25 +++++++++++++++++++------
 2 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index d84ae0e30369..0a50a08ab844 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -803,6 +803,7 @@ static int inet_dump_fib(struct sk_buff *skb, struct 
netlink_callback *cb)
 static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct 
in_ifaddr *ifa)
 {
        struct net *net = dev_net(ifa->ifa_dev->dev);
+       int tb_id = vrf_dev_table_rtnl(ifa->ifa_dev->dev);
        struct fib_table *tb;
        struct fib_config cfg = {
                .fc_protocol = RTPROT_KERNEL,
@@ -817,11 +818,10 @@ static void fib_magic(int cmd, int type, __be32 dst, int 
dst_len, struct in_ifad
                },
        };
 
-       if (type == RTN_UNICAST)
-               tb = fib_new_table(net, RT_TABLE_MAIN);
-       else
-               tb = fib_new_table(net, RT_TABLE_LOCAL);
+       if (!tb_id)
+               tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL;
 
+       tb = fib_new_table(net, tb_id);
        if (!tb)
                return;
 
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 410ddb67221e..85e9a8abf15c 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -838,6 +838,23 @@ __be32 fib_info_update_nh_saddr(struct net *net, struct 
fib_nh *nh)
        return nh->nh_saddr;
 }
 
+static bool fib_valid_prefsrc(struct fib_config *cfg, __be32 fib_prefsrc)
+{
+       if (cfg->fc_type != RTN_LOCAL || !cfg->fc_dst ||
+           fib_prefsrc != cfg->fc_dst) {
+               int tb_id = cfg->fc_table;
+
+               if (tb_id == RT_TABLE_MAIN)
+                       tb_id = RT_TABLE_LOCAL;
+
+               if (inet_addr_type_table(cfg->fc_nlinfo.nl_net,
+                                        fib_prefsrc, tb_id) != RTN_LOCAL) {
+                       return false;
+               }
+       }
+       return true;
+}
+
 struct fib_info *fib_create_info(struct fib_config *cfg)
 {
        int err;
@@ -1033,12 +1050,8 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
                        fi->fib_flags |= RTNH_F_LINKDOWN;
        }
 
-       if (fi->fib_prefsrc) {
-               if (cfg->fc_type != RTN_LOCAL || !cfg->fc_dst ||
-                   fi->fib_prefsrc != cfg->fc_dst)
-                       if (inet_addr_type(net, fi->fib_prefsrc) != RTN_LOCAL)
-                               goto err_inval;
-       }
+       if (fi->fib_prefsrc && !fib_valid_prefsrc(cfg, fi->fib_prefsrc))
+               goto err_inval;
 
        change_nexthops(fi) {
                fib_info_update_nh_saddr(net, nexthop_nh);
-- 
2.3.2 (Apple Git-55)

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