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authorEric W. Biederman <ebiederm@xmission.com>2015-03-03 19:14:31 -0600
committerDavid S. Miller <davem@davemloft.net>2015-03-04 00:26:06 -0500
commit8de147dc8e2adea82b8a1a2a08fcc983330f6770 (patch)
tree2c0562994dc0ee616aabef727064120cf615f356 /net/mpls
parent03c0566542f4c7a45ce3193f27cbf5700b506c18 (diff)
downloadlinux-stericsson-8de147dc8e2adea82b8a1a2a08fcc983330f6770.tar.gz
mpls: Multicast route table change notifications
Unlike IPv4 this code notifies on all cases where mpls routes are added or removed and it never automatically removes routes. Avoiding both the userspace confusion that is caused by omitting route updates and the possibility of a flood of netlink traffic when an interface goes doew. For now reserved labels are handled automatically and userspace is not notified. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mpls')
-rw-r--r--net/mpls/af_mpls.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index b4d7cec398d2..75a994a50381 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -36,6 +36,10 @@ struct mpls_route { /* next hop label forwarding entry */
static int zero = 0;
static int label_limit = (1 << 20) - 1;
+static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
+ struct nlmsghdr *nlh, struct net *net, u32 portid,
+ unsigned int nlm_flags);
+
static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index)
{
struct mpls_route *rt = NULL;
@@ -246,6 +250,20 @@ static void mpls_rt_free(struct mpls_route *rt)
kfree_rcu(rt, rt_rcu);
}
+static void mpls_notify_route(struct net *net, unsigned index,
+ struct mpls_route *old, struct mpls_route *new,
+ const struct nl_info *info)
+{
+ struct nlmsghdr *nlh = info ? info->nlh : NULL;
+ unsigned portid = info ? info->portid : 0;
+ int event = new ? RTM_NEWROUTE : RTM_DELROUTE;
+ struct mpls_route *rt = new ? new : old;
+ unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0;
+ /* Ignore reserved labels for now */
+ if (rt && (index >= 16))
+ rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags);
+}
+
static void mpls_route_update(struct net *net, unsigned index,
struct net_device *dev, struct mpls_route *new,
const struct nl_info *info)
@@ -260,6 +278,8 @@ static void mpls_route_update(struct net *net, unsigned index,
old = rt;
}
+ mpls_notify_route(net, index, old, new, info);
+
/* If we removed a route free it now */
mpls_rt_free(old);
}
@@ -692,6 +712,46 @@ static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb)
return skb->len;
}
+static inline size_t lfib_nlmsg_size(struct mpls_route *rt)
+{
+ size_t payload =
+ NLMSG_ALIGN(sizeof(struct rtmsg))
+ + nla_total_size(2 + rt->rt_via_alen) /* RTA_VIA */
+ + nla_total_size(4); /* RTA_DST */
+ if (rt->rt_labels) /* RTA_NEWDST */
+ payload += nla_total_size(rt->rt_labels * 4);
+ if (rt->rt_dev) /* RTA_OIF */
+ payload += nla_total_size(4);
+ return payload;
+}
+
+static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
+ struct nlmsghdr *nlh, struct net *net, u32 portid,
+ unsigned int nlm_flags)
+{
+ struct sk_buff *skb;
+ u32 seq = nlh ? nlh->nlmsg_seq : 0;
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
+ if (skb == NULL)
+ goto errout;
+
+ err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in lfib_nlmsg_size */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL);
+
+ return;
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err);
+}
+
static int resize_platform_label_table(struct net *net, size_t limit)
{
size_t size = sizeof(struct mpls_route *) * limit;