[PATCH net-next 03/17] ipv6: Extend notifier info for multipath routes

[Ido Schimmel]

From: Ido Schimmel <ido...@mellanox.com>

Extend the IPv6 FIB notifier info with number of sibling routes being
notified.

This will later allow listeners to process one notification for a
multipath routes instead of N, where N is the number of nexthops.

Signed-off-by: Ido Schimmel <ido...@mellanox.com>
Acked-by: Jiri Pirko <j...@mellanox.com>
---
 include/net/ip6_fib.h |  7 +++++++
 net/ipv6/ip6_fib.c    | 17 +++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 1e92f1500b87..a0c91fc59eea 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -377,6 +377,8 @@ typedef struct rt6_info *(*pol_lookup_t)(struct net *,
 struct fib6_entry_notifier_info {
        struct fib_notifier_info info; /* must be first */
        struct fib6_info *rt;
+       unsigned int nsiblings; /* Only valid when 'multipath_rt' is set */
+       bool multipath_rt;
 };
 
 /*
@@ -450,6 +452,11 @@ int call_fib6_entry_notifiers(struct net *net,
                              enum fib_event_type event_type,
                              struct fib6_info *rt,
                              struct netlink_ext_ack *extack);
+int call_fib6_multipath_entry_notifiers(struct net *net,
+                                       enum fib_event_type event_type,
+                                       struct fib6_info *rt,
+                                       unsigned int nsiblings,
+                                       struct netlink_ext_ack *extack);
 void fib6_rt_update(struct net *net, struct fib6_info *rt,
                    struct nl_info *info);
 void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 1cce2082279c..df08ba8fe6fc 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -381,6 +381,23 @@ int call_fib6_entry_notifiers(struct net *net,
        return call_fib6_notifiers(net, event_type, &info.info);
 }
 
+int call_fib6_multipath_entry_notifiers(struct net *net,
+                                       enum fib_event_type event_type,
+                                       struct fib6_info *rt,
+                                       unsigned int nsiblings,
+                                       struct netlink_ext_ack *extack)
+{
+       struct fib6_entry_notifier_info info = {
+               .info.extack = extack,
+               .rt = rt,
+               .nsiblings = nsiblings,
+               .multipath_rt = true,
+       };
+
+       rt->fib6_table->fib_seq++;
+       return call_fib6_notifiers(net, event_type, &info.info);
+}
+
 struct fib6_dump_arg {
        struct net *net;
        struct notifier_block *nb;
-- 
2.20.1