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Commit c76fe2d9 authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

net: ipv6: send unsolicited NA after DAD 



Unsolicited IPv6 neighbor advertisements should be sent after DAD
completes. Update ndisc_send_unsol_na to skip tentative, non-optimistic
addresses and have those sent by addrconf_dad_completed after DAD.

Fixes: 4a6e3c5d ("net: ipv6: send unsolicited NA on admin up")
Reported-by: default avatarVivek Venkatraman <vivek@cumulusnetworks.com>
Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 202a0a70

net/ipv6/addrconf.c

+26 −4
Original line number Diff line number Diff line
@@ -186,7 +186,8 @@ static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 


static void addrconf_dad_start(struct inet6_ifaddr *ifp);

static void addrconf_dad_work(struct work_struct *w);

static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);

static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,

				   bool send_na);

static void addrconf_dad_run(struct inet6_dev *idev);

static void addrconf_rs_timer(struct timer_list *t);

static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
@@ -3838,12 +3839,17 @@ static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 
	     idev->cnf.accept_dad < 1) ||

	    !(ifp->flags&IFA_F_TENTATIVE) ||

	    ifp->flags & IFA_F_NODAD) {

		bool send_na = false;



		if (ifp->flags & IFA_F_TENTATIVE &&

		    !(ifp->flags & IFA_F_OPTIMISTIC))

			send_na = true;

		bump_id = ifp->flags & IFA_F_TENTATIVE;

		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);

		spin_unlock(&ifp->lock);

		read_unlock_bh(&idev->lock);



		addrconf_dad_completed(ifp, bump_id);

		addrconf_dad_completed(ifp, bump_id, send_na);

		return;

	}
@@ -3972,16 +3978,21 @@ static void addrconf_dad_work(struct work_struct *w) 
	}



	if (ifp->dad_probes == 0) {

		bool send_na = false;



		/*

		 * DAD was successful

		 */



		if (ifp->flags & IFA_F_TENTATIVE &&

		    !(ifp->flags & IFA_F_OPTIMISTIC))

			send_na = true;

		bump_id = ifp->flags & IFA_F_TENTATIVE;

		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);

		spin_unlock(&ifp->lock);

		write_unlock_bh(&idev->lock);



		addrconf_dad_completed(ifp, bump_id);

		addrconf_dad_completed(ifp, bump_id, send_na);



		goto out;

	}
@@ -4019,7 +4030,8 @@ static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 
	return true;

}



static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)

static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,

				   bool send_na)

{

	struct net_device *dev = ifp->idev->dev;

	struct in6_addr lladdr;
@@ -4051,6 +4063,16 @@ static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id) 
	if (send_mld)

		ipv6_mc_dad_complete(ifp->idev);



	/* send unsolicited NA if enabled */

	if (send_na &&

	    (ifp->idev->cnf.ndisc_notify ||

	     dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {

		ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,

			      /*router=*/ !!ifp->idev->cnf.forwarding,

			      /*solicited=*/ false, /*override=*/ true,

			      /*inc_opt=*/ true);

	}



	if (send_rs) {

		/*

		 *	If a host as already performed a random delay

net/ipv6/ndisc.c

+5 −0
Original line number Diff line number Diff line
@@ -566,6 +566,11 @@ static void ndisc_send_unsol_na(struct net_device *dev) 


	read_lock_bh(&idev->lock);

	list_for_each_entry(ifa, &idev->addr_list, if_list) {

		/* skip tentative addresses until dad completes */

		if (ifa->flags & IFA_F_TENTATIVE &&

		    !(ifa->flags & IFA_F_OPTIMISTIC))

			continue;



		ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifa->addr,

			      /*router=*/ !!idev->cnf.forwarding,

			      /*solicited=*/ false, /*override=*/ true,