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authorDavid Ahern <dsahern@gmail.com>2019-05-22 12:04:41 -0700
committerDavid S. Miller <davem@davemloft.net>2019-05-22 17:48:43 -0700
commit19a3b7eea42402accf52bcb9ddb51bfdb4d7a13b (patch)
treea7829e17b8cc38db2e463e4ab6eacc3318a6ff39 /net
parentcdaa16a4f70cfa6c55641588c3a3eb9b53abd56b (diff)
ipv6: export function to send route updates
Add fib6_rt_update to send RTM_NEWROUTE with NLM_F_REPLACE set. This helper will be used by the nexthop code to notify userspace of routes that are impacted when a nexthop config is updated via replace. This notification is needed for legacy apps that do not understand the new nexthop object. Apps that are nexthop aware can use the RTA_NH_ID attribute in the route notification to just ignore it. In the future this should be wrapped in a sysctl to allow OS'es that are fully updated to avoid the notificaton storm. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/af_inet6.c1
-rw-r--r--net/ipv6/ip6_fib.c8
-rw-r--r--net/ipv6/route.c32
3 files changed, 37 insertions, 4 deletions
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 55138f0d2b9d..cc6f8d0c625a 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -927,6 +927,7 @@ static const struct ipv6_stub ipv6_stub_impl = {
.fib6_nh_init = fib6_nh_init,
.fib6_nh_release = fib6_nh_release,
.fib6_update_sernum = fib6_update_sernum_stub,
+ .fib6_rt_update = fib6_rt_update,
.ip6_del_rt = ip6_del_rt,
.udpv6_encap_enable = udpv6_encap_enable,
.ndisc_send_na = ndisc_send_na,
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index df726fb8f70f..7958cf91895a 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -393,10 +393,10 @@ static int call_fib6_entry_notifier(struct notifier_block *nb, struct net *net,
return call_fib6_notifier(nb, net, event_type, &info.info);
}
-static int call_fib6_entry_notifiers(struct net *net,
- enum fib_event_type event_type,
- struct fib6_info *rt,
- struct netlink_ext_ack *extack)
+int call_fib6_entry_notifiers(struct net *net,
+ enum fib_event_type event_type,
+ struct fib6_info *rt,
+ struct netlink_ext_ack *extack)
{
struct fib6_entry_notifier_info info = {
.info.extack = extack,
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 7a014ca877ed..c52a7f49d096 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -5123,6 +5123,38 @@ errout:
rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
}
+void fib6_rt_update(struct net *net, struct fib6_info *rt,
+ struct nl_info *info)
+{
+ u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
+ struct sk_buff *skb;
+ int err = -ENOBUFS;
+
+ /* call_fib6_entry_notifiers will be removed when in-kernel notifier
+ * is implemented and supported for nexthop objects
+ */
+ call_fib6_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, rt, NULL);
+
+ skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
+ if (!skb)
+ goto errout;
+
+ err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
+ RTM_NEWROUTE, info->portid, seq, NLM_F_REPLACE);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
+ info->nlh, gfp_any());
+ return;
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
+}
+
static int ip6_route_dev_notify(struct notifier_block *this,
unsigned long event, void *ptr)
{