diff options
| author | Joel Scherpelz <jscherpelz@google.com> | 2017-03-22 18:19:04 +0900 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-03-22 14:20:54 -0700 |
| commit | bbea124bc99df968011e76eba105fe964a4eceab (patch) | |
| tree | ec41e6976abf168397615c51eb4a676b37f5bb5e /net/ipv6/ndisc.c | |
| parent | 0e4c9f13da28990064c958839e85c565f6adcbf5 (diff) | |
| download | linux-bbea124bc99df968011e76eba105fe964a4eceab.tar.bz2 | |
net: ipv6: Add sysctl for minimum prefix len acceptable in RIOs.
This commit adds a new sysctl accept_ra_rt_info_min_plen that
defines the minimum acceptable prefix length of Route Information
Options. The new sysctl is intended to be used together with
accept_ra_rt_info_max_plen to configure a range of acceptable
prefix lengths. It is useful to prevent misconfigurations from
unintentionally blackholing too much of the IPv6 address space
(e.g., home routers announcing RIOs for fc00::/7, which is
incorrect).
Signed-off-by: Joel Scherpelz <jscherpelz@google.com>
Acked-by: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ndisc.c')
| -rw-r--r-- | net/ipv6/ndisc.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index 112ccbc0a8ac..b5812b3f7539 100644 --- a/net/ipv6/ndisc.c +++ b/net/ipv6/ndisc.c @@ -1418,6 +1418,8 @@ skip_linkparms: if (ri->prefix_len == 0 && !in6_dev->cnf.accept_ra_defrtr) continue; + if (ri->prefix_len < in6_dev->cnf.accept_ra_rt_info_min_plen) + continue; if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) continue; rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3, |