Commit 7fd2561e authored by Erik Kline's avatar Erik Kline Committed by David S. Miller
Browse files

net: ipv6: Add a sysctl to make optimistic addresses useful candidates 



Add a sysctl that causes an interface's optimistic addresses
to be considered equivalent to other non-deprecated addresses
for source address selection purposes.  Preferred addresses
will still take precedence over optimistic addresses, subject
to other ranking in the source address selection algorithm.

This is useful where different interfaces are connected to
different networks from different ISPs (e.g., a cell network
and a home wifi network).

The current behaviour complies with RFC 3484/6724, and it
makes sense if the host has only one interface, or has
multiple interfaces on the same network (same or cooperating
administrative domain(s), but not in the multiple distinct
networks case.

For example, if a mobile device has an IPv6 address on an LTE
network and then connects to IPv6-enabled wifi, while the wifi
IPv6 address is undergoing DAD, IPv6 connections will try use
the wifi default route with the LTE IPv6 address, and will get
stuck until they time out.

Also, because optimistic nodes can receive frames, issue
an RTM_NEWADDR as soon as DAD starts (with the IFA_F_OPTIMSTIC
flag appropriately set).  A second RTM_NEWADDR is sent if DAD
completes (the address flags have changed), otherwise an
RTM_DELADDR is sent.

Also: add an entry in ip-sysctl.txt for optimistic_dad.

Signed-off-by: default avatarErik Kline <ek@google.com>
Acked-by: default avatarLorenzo Colitti <lorenzo@google.com>
Acked-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8b243a61

Documentation/networking/ip-sysctl.txt

+13 −0
Original line number Diff line number Diff line
@@ -1460,6 +1460,19 @@ suppress_frag_ndisc - INTEGER 
	1 - (default) discard fragmented neighbor discovery packets

	0 - allow fragmented neighbor discovery packets



optimistic_dad - BOOLEAN

	Whether to perform Optimistic Duplicate Address Detection (RFC 4429).

		0: disabled (default)

		1: enabled



use_optimistic - BOOLEAN

	If enabled, do not classify optimistic addresses as deprecated during

	source address selection.  Preferred addresses will still be chosen

	before optimistic addresses, subject to other ranking in the source

	address selection algorithm.

		0: disabled (default)

		1: enabled



icmp/*:

ratelimit - INTEGER

	Limit the maximal rates for sending ICMPv6 packets.

include/linux/ipv6.h

+1 −0
Original line number Diff line number Diff line
@@ -42,6 +42,7 @@ struct ipv6_devconf { 
	__s32		accept_ra_from_local;

#ifdef CONFIG_IPV6_OPTIMISTIC_DAD

	__s32		optimistic_dad;

	__s32		use_optimistic;

#endif

#ifdef CONFIG_IPV6_MROUTE

	__s32		mc_forwarding;

include/uapi/linux/ipv6.h

+1 −0
Original line number Diff line number Diff line
@@ -164,6 +164,7 @@ enum { 
	DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL,

	DEVCONF_SUPPRESS_FRAG_NDISC,

	DEVCONF_ACCEPT_RA_FROM_LOCAL,

	DEVCONF_USE_OPTIMISTIC,

	DEVCONF_MAX

};

net/ipv6/addrconf.c

+44 −2
Original line number Diff line number Diff line
@@ -1170,6 +1170,9 @@ enum { 
	IPV6_SADDR_RULE_PRIVACY,

	IPV6_SADDR_RULE_ORCHID,

	IPV6_SADDR_RULE_PREFIX,

#ifdef CONFIG_IPV6_OPTIMISTIC_DAD

	IPV6_SADDR_RULE_NOT_OPTIMISTIC,

#endif

	IPV6_SADDR_RULE_MAX

};
@@ -1197,6 +1200,15 @@ static inline int ipv6_saddr_preferred(int type) 
	return 0;

}



static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)

{

#ifdef CONFIG_IPV6_OPTIMISTIC_DAD

	return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;

#else

	return false;

#endif

}



static int ipv6_get_saddr_eval(struct net *net,

			       struct ipv6_saddr_score *score,

			       struct ipv6_saddr_dst *dst,
@@ -1257,10 +1269,16 @@ static int ipv6_get_saddr_eval(struct net *net, 
		score->scopedist = ret;

		break;

	case IPV6_SADDR_RULE_PREFERRED:

	    {

		/* Rule 3: Avoid deprecated and optimistic addresses */

		u8 avoid = IFA_F_DEPRECATED;



		if (!ipv6_use_optimistic_addr(score->ifa->idev))

			avoid |= IFA_F_OPTIMISTIC;

		ret = ipv6_saddr_preferred(score->addr_type) ||

		      !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));

		      !(score->ifa->flags & avoid);

		break;

	    }

#ifdef CONFIG_IPV6_MIP6

	case IPV6_SADDR_RULE_HOA:

	    {
@@ -1306,6 +1324,14 @@ static int ipv6_get_saddr_eval(struct net *net, 
			ret = score->ifa->prefix_len;

		score->matchlen = ret;

		break;

#ifdef CONFIG_IPV6_OPTIMISTIC_DAD

	case IPV6_SADDR_RULE_NOT_OPTIMISTIC:

		/* Optimistic addresses still have lower precedence than other

		 * preferred addresses.

		 */

		ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);

		break;

#endif

	default:

		ret = 0;

	}
@@ -3222,8 +3248,15 @@ static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 
	 * Optimistic nodes can start receiving

	 * Frames right away

	 */

	if (ifp->flags & IFA_F_OPTIMISTIC)

	if (ifp->flags & IFA_F_OPTIMISTIC) {

		ip6_ins_rt(ifp->rt);

		if (ipv6_use_optimistic_addr(idev)) {

			/* Because optimistic nodes can use this address,

			 * notify listeners. If DAD fails, RTM_DELADDR is sent.

			 */

			ipv6_ifa_notify(RTM_NEWADDR, ifp);

		}

	}



	addrconf_dad_kick(ifp);

out:
@@ -4330,6 +4363,7 @@ static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 
	array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;

#ifdef CONFIG_IPV6_OPTIMISTIC_DAD

	array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;

	array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;

#endif

#ifdef CONFIG_IPV6_MROUTE

	array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
@@ -5155,6 +5189,14 @@ static struct addrconf_sysctl_table 
			.proc_handler   = proc_dointvec,



		},

		{

			.procname       = "use_optimistic",

			.data           = &ipv6_devconf.use_optimistic,

			.maxlen         = sizeof(int),

			.mode           = 0644,

			.proc_handler   = proc_dointvec,



		},

#endif

#ifdef CONFIG_IPV6_MROUTE

		{

CRA Git | Maintained and supported by SUSTech CRA and CCSE