ipv4: include NLM_F_APPEND flag in append route notifications

This patch adds NLM_F_APPEND flag to struct nlmsg_hdr->nlmsg_flags
in newroute notifications if the route add was an append.
(This is similar to how NLM_F_REPLACE is already part of new
route replace notifications today)

This helps userspace determine if the route add operation was
an append.

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Acked-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 3c699c4e90a4645bb99bdd245fdbf1cde17e0e49..6c666a9f1bd52d491e845b89f698726b28abbf4c 100644 (file)
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1082,6 +1082,7 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
        struct trie *t = (struct trie *)tb->tb_data;
        struct fib_alias *fa, *new_fa;
        struct key_vector *l, *tp;
+       unsigned int nlflags = 0;
        struct fib_info *fi;
        u8 plen = cfg->fc_dst_len;
        u8 slen = KEYLENGTH - plen;
@@ -1201,7 +1202,9 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
                if (fa_match)
                        goto out;
 
-               if (!(cfg->fc_nlflags & NLM_F_APPEND))
+               if (cfg->fc_nlflags & NLM_F_APPEND)
+                       nlflags = NLM_F_APPEND;
+               else
                        fa = fa_first;
        }
        err = -ENOENT;
@@ -1238,7 +1241,7 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
 
        rt_cache_flush(cfg->fc_nlinfo.nl_net);
        rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, new_fa->tb_id,
-                 &cfg->fc_nlinfo, 0);
+                 &cfg->fc_nlinfo, nlflags);
 succeeded:
        return 0;