diff options
Diffstat (limited to 'net/ipv4/route.c')
| -rw-r--r-- | net/ipv4/route.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index df251424d816..844a9ef60dbd 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -2232,8 +2232,27 @@ static int rt_fill_info(struct net *net, __be32 dst, __be32 src, error = rt->dst.error; if (rt_is_input_route(rt)) { - if (nla_put_u32(skb, RTA_IIF, rt->rt_iif)) - goto nla_put_failure; +#ifdef CONFIG_IP_MROUTE + if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) && + IPV4_DEVCONF_ALL(net, MC_FORWARDING)) { + int err = ipmr_get_route(net, skb, + fl4->saddr, fl4->daddr, + r, nowait); + if (err <= 0) { + if (!nowait) { + if (err == 0) + return 0; + goto nla_put_failure; + } else { + if (err == -EMSGSIZE) + goto nla_put_failure; + error = err; + } + } + } else +#endif + if (nla_put_u32(skb, RTA_IIF, rt->rt_iif)) + goto nla_put_failure; } if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, error) < 0) @@ -2496,6 +2515,10 @@ static __net_init int sysctl_route_net_init(struct net *net) tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL); if (tbl == NULL) goto err_dup; + + /* Don't export sysctls to unprivileged users */ + if (net->user_ns != &init_user_ns) + tbl[0].procname = NULL; } tbl[0].extra1 = net; |