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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>
This commit is contained in:
Donald Sharp 2017-06-28 13:58:57 -04:00 committed by David S. Miller
parent 8007e40a24
commit 4f75ba6982
1 changed files with 62 additions and 1 deletions
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63
net/ipv4/ipmr.c
View File

@ -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,