diff options
| -rw-r--r-- | net/ipv4/ipmr.c | 63 |
1 files changed, 62 insertions, 1 deletions
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c index a1d521be612b..bb909f1d7537 100644 --- a/net/ipv4/ipmr.c +++ b/net/ipv4/ipmr.c @@ -2406,6 +2406,67 @@ errout: rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE_R, -ENOBUFS); } +static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(in_skb->sk); + struct nlattr *tb[RTA_MAX + 1]; + struct sk_buff *skb = NULL; + struct mfc_cache *cache; + struct mr_table *mrt; + struct rtmsg *rtm; + __be32 src, grp; + u32 tableid; + int err; + + err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, + rtm_ipv4_policy, extack); + if (err < 0) + goto errout; + + rtm = nlmsg_data(nlh); + + src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0; + grp = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0; + tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0; + + mrt = ipmr_get_table(net, tableid ? tableid : RT_TABLE_DEFAULT); + if (IS_ERR(mrt)) { + err = PTR_ERR(mrt); + goto errout_free; + } + + /* entries are added/deleted only under RTNL */ + rcu_read_lock(); + cache = ipmr_cache_find(mrt, src, grp); + rcu_read_unlock(); + if (!cache) { + err = -ENOENT; + goto errout_free; + } + + skb = nlmsg_new(mroute_msgsize(false, mrt->maxvif), GFP_KERNEL); + if (!skb) { + err = -ENOBUFS; + goto errout_free; + } + + err = ipmr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid, + nlh->nlmsg_seq, cache, + RTM_NEWROUTE, 0); + if (err < 0) + goto errout_free; + + err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); + +errout: + return err; + +errout_free: + kfree_skb(skb); + goto errout; +} + static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) { struct net *net = sock_net(skb->sk); @@ -3053,7 +3114,7 @@ int __init ip_mr_init(void) } #endif rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, - NULL, ipmr_rtm_dumproute, NULL); + ipmr_rtm_getroute, ipmr_rtm_dumproute, NULL); rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE, ipmr_rtm_route, NULL, NULL); rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE, |