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Commit b2b17995 authored by Tianyi Gou's avatar Tianyi Gou Committed by Gerrit - the friendly Code Review server
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net/ipv6/addrconf: IPv6 tethering enhancement 



Added new procfs flag to toggle the automatic addition of prefix
routes on a per device basis. The new flag is accept_ra_prefix_route.
Defaults to 1 as to not break existing behavior.

CRs-Fixed: 435320
Change-Id: If25493890c7531c27f5b2c4855afebbbbf5d072a
Acked-by: default avatarHarout S. Hedeshian <harouth@qti.qualcomm.com>
Signed-off-by: default avatarTianyi Gou <tgou@codeaurora.org>
Signed-off-by: default avatarSubash Abhinov Kasiviswanathan <subashab@codeaurora.org>
parent 7d54fbdb

Documentation/networking/ip-sysctl.txt

+5 −0
Original line number Diff line number Diff line
@@ -1291,6 +1291,11 @@ accept_ra_rtr_pref - BOOLEAN 
	Functional default: enabled if accept_ra is enabled.

			    disabled if accept_ra is disabled.



accept_ra_prefix_route - BOOLEAN

	Set the prefix route for the autoconfigured interface address



	Functional default: enabled



accept_redirects - BOOLEAN

	Accept Redirects.

include/linux/ipv6.h

+1 −0
Original line number Diff line number Diff line
@@ -53,6 +53,7 @@ struct ipv6_devconf { 
	__s32		force_tllao;

	__s32           ndisc_notify;

	__s32		suppress_frag_ndisc;

	__s32		accept_ra_prefix_route;

	void		*sysctl;

};

include/uapi/linux/ipv6.h

+1 −0
Original line number Diff line number Diff line
@@ -166,6 +166,7 @@ enum { 
	DEVCONF_SUPPRESS_FRAG_NDISC,

	DEVCONF_ACCEPT_RA_FROM_LOCAL,

	DEVCONF_USE_OPTIMISTIC,

	DEVCONF_ACCEPT_RA_PREFIX_ROUTE,

	DEVCONF_MAX

};

kernel/sysctl_binary.c

+1 −0
Original line number Diff line number Diff line
@@ -524,6 +524,7 @@ static const struct bin_table bin_net_ipv6_conf_var_table[] = { 
	{ CTL_INT,	NET_IPV6_PROXY_NDP,			"proxy_ndp" },

	{ CTL_INT,	NET_IPV6_ACCEPT_SOURCE_ROUTE,		"accept_source_route" },

	{ CTL_INT,	NET_IPV6_ACCEPT_RA_FROM_LOCAL,		"accept_ra_from_local" },

	{ CTL_INT,	NET_IPV6_ACCEPT_RA_PREFIX_ROUTE,	"accept_ra_prefix_route" },

	{}

};

net/ipv6/addrconf.c

+14 −2
Original line number Diff line number Diff line
@@ -202,6 +202,7 @@ static struct ipv6_devconf ipv6_devconf __read_mostly = { 
	.disable_ipv6		= 0,

	.accept_dad		= 1,

	.suppress_frag_ndisc	= 1,

	.accept_ra_prefix_route = 1,

};



static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
@@ -240,6 +241,7 @@ static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 
	.disable_ipv6		= 0,

	.accept_dad		= 1,

	.suppress_frag_ndisc	= 1,

	.accept_ra_prefix_route = 1,

};



/* Check if a valid qdisc is available */
@@ -2293,9 +2295,12 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 
				flags |= RTF_EXPIRES;

				expires = jiffies_to_clock_t(rt_expires);

			}

			addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,

			if (dev->ip6_ptr->cnf.accept_ra_prefix_route) {

				addrconf_prefix_route(&pinfo->prefix,

						      pinfo->prefix_len,

						      dev, expires, flags);

			}

		}

		ip6_rt_put(rt);

	}
@@ -5316,6 +5321,13 @@ static struct addrconf_sysctl_table 
			.mode		= 0644,

			.proc_handler	= proc_dointvec,

		},

		{

			.procname	= "accept_ra_prefix_route",

			.data		= &ipv6_devconf.accept_ra_prefix_route,

			.maxlen		= sizeof(int),

			.mode		= 0644,

			.proc_handler	= proc_dointvec,

		},

		{

			/* sentinel */

		}