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authorDonald Sharp <sharpd@cumulusnetworks.com>2017-06-28 13:58:57 -0400
committerDavid S. Miller <davem@davemloft.net>2017-06-29 15:37:48 -0400
commit4f75ba6982bc7e37e7738b2f1257d21a9c9e5d31 (patch)
tree8da81ea0fb668f1f9e96a53d20253bc19c897532 /net/ipv4
parent8007e40a24e12d35189203370268c7278f29ab74 (diff)
net: ipmr: Add ipmr_rtm_getroute
Add to RTNL_FAMILY_IPMR, RTM_GETROUTE the ability to retrieve one S,G mroute from a specified table. *,G will return mroute information for just that particular mroute if it exists. This is because it is entirely possible to have more S's then can fit in one skb to return to the requesting process. Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com> Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/ipmr.c63
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,