Commit 19a3b7ee authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

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: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cdaa16a4

include/net/ip6_fib.h

+6 −0
Original line number Diff line number Diff line
@@ -452,6 +452,12 @@ int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh, 
		 struct netlink_ext_ack *extack);

void fib6_nh_release(struct fib6_nh *fib6_nh);



int call_fib6_entry_notifiers(struct net *net,

			      enum fib_event_type event_type,

			      struct fib6_info *rt,

			      struct netlink_ext_ack *extack);

void fib6_rt_update(struct net *net, struct fib6_info *rt,

		    struct nl_info *info);

void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,

		     unsigned int flags);

include/net/ipv6_stubs.h

+3 −0
Original line number Diff line number Diff line
@@ -47,6 +47,9 @@ struct ipv6_stub { 
	void (*fib6_nh_release)(struct fib6_nh *fib6_nh);

	void (*fib6_update_sernum)(struct net *net, struct fib6_info *rt);

	int (*ip6_del_rt)(struct net *net, struct fib6_info *rt);

	void (*fib6_rt_update)(struct net *net, struct fib6_info *rt,

			       struct nl_info *info);



	void (*udpv6_encap_enable)(void);

	void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,

			      const struct in6_addr *solicited_addr,

net/ipv6/af_inet6.c

+1 −0
Original line number Diff line number Diff line
@@ -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,

net/ipv6/ip6_fib.c

+4 −4
Original line number Diff line number Diff line
@@ -393,7 +393,7 @@ 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,

int call_fib6_entry_notifiers(struct net *net,

			      enum fib_event_type event_type,

			      struct fib6_info *rt,

			      struct netlink_ext_ack *extack)

net/ipv6/route.c

+32 −0
Original line number Diff line number Diff line
@@ -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)

{

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