diff options
| author | Robert Shearman <rshearma@brocade.com> | 2015-12-10 20:30:51 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-12-12 06:43:44 +0100 |
| commit | f20367df1af8f6a4e85b7e586213b8508796fe79 (patch) | |
| tree | b078d7f3dd5461b90a74c8cd9bc6c5a41e434cbd /net/mpls/af_mpls.c | |
| parent | mpls: fix out-of-bounds access when via address not specified (diff) | |
| download | linux-f20367df1af8f6a4e85b7e586213b8508796fe79.tar.xz linux-f20367df1af8f6a4e85b7e586213b8508796fe79.zip | |
mpls: make via address optional for multipath routes
The via address is optional for a single path route, yet is mandatory
when the multipath attribute is used:
# ip -f mpls route add 100 dev lo
# ip -f mpls route add 101 nexthop dev lo
RTNETLINK answers: Invalid argument
Make them consistent by making the via address optional when the
RTA_MULTIPATH attribute is being parsed so that both forms of
specifying the route work.
Signed-off-by: Robert Shearman <rshearma@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mpls/af_mpls.c')
| -rw-r--r-- | net/mpls/af_mpls.c | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c index 7bfc85f52ca8..c32fc411a911 100644 --- a/net/mpls/af_mpls.c +++ b/net/mpls/af_mpls.c @@ -604,10 +604,14 @@ static int mpls_nh_build(struct net *net, struct mpls_route *rt, goto errout; } - err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, - __mpls_nh_via(rt, nh)); - if (err) - goto errout; + if (via) { + err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, + __mpls_nh_via(rt, nh)); + if (err) + goto errout; + } else { + nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC; + } err = mpls_nh_assign_dev(net, rt, nh, oif); if (err) @@ -689,9 +693,6 @@ static int mpls_nh_build_multi(struct mpls_route_config *cfg, nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); } - if (!nla_via) - goto errout; - err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, rtnh->rtnh_ifindex, nla_via, nla_newdst); @@ -1271,7 +1272,8 @@ static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, nh->nh_labels, nh->nh_label)) goto nla_put_failure; - if (nla_put_via(skb, nh->nh_via_table, + if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && + nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), nh->nh_via_alen)) goto nla_put_failure; @@ -1343,7 +1345,9 @@ static inline size_t lfib_nlmsg_size(struct mpls_route *rt) for_nexthops(rt) { nhsize += nla_total_size(sizeof(struct rtnexthop)); - nhsize += nla_total_size(2 + nh->nh_via_alen); + /* RTA_VIA */ + if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) + nhsize += nla_total_size(2 + nh->nh_via_alen); if (nh->nh_labels) nhsize += nla_total_size(nh->nh_labels * 4); } endfor_nexthops(rt); |