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Commit c2943f14 authored by Harout Hedeshian's avatar Harout Hedeshian Committed by David S. Miller
Browse files

net: ipv6: Add sysctl entry to disable MTU updates from RA 



The kernel forcefully applies MTU values received in router
advertisements provided the new MTU is less than the current. This
behavior is undesirable when the user space is managing the MTU. Instead
a sysctl flag 'accept_ra_mtu' is introduced such that the user space
can control whether or not RA provided MTU updates should be applied. The
default behavior is unchanged; user space must explicitly set this flag
to 0 for RA MTUs to be ignored.

Signed-off-by: default avatarHarout Hedeshian <harouth@codeaurora.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 46a93af2

Documentation/networking/ip-sysctl.txt

+7 −0
Original line number Diff line number Diff line
@@ -1287,6 +1287,13 @@ accept_ra_rtr_pref - BOOLEAN 
	Functional default: enabled if accept_ra is enabled.

			    disabled if accept_ra is disabled.



accept_ra_mtu - BOOLEAN

	Apply the MTU value specified in RA option 5 (RFC4861). If

	disabled, the MTU specified in the RA will be ignored.



	Functional default: enabled if accept_ra is enabled.

			    disabled if accept_ra is disabled.



accept_redirects - BOOLEAN

	Accept Redirects.

include/linux/ipv6.h

+1 −0
Original line number Diff line number Diff line
@@ -52,6 +52,7 @@ struct ipv6_devconf { 
	__s32		force_tllao;

	__s32           ndisc_notify;

	__s32		suppress_frag_ndisc;

	__s32		accept_ra_mtu;

	void		*sysctl;

};

include/uapi/linux/ipv6.h

+1 −0
Original line number Diff line number Diff line
@@ -169,6 +169,7 @@ enum { 
	DEVCONF_SUPPRESS_FRAG_NDISC,

	DEVCONF_ACCEPT_RA_FROM_LOCAL,

	DEVCONF_USE_OPTIMISTIC,

	DEVCONF_ACCEPT_RA_MTU,

	DEVCONF_MAX

};

net/ipv6/addrconf.c

+10 −0
Original line number Diff line number Diff line
@@ -201,6 +201,7 @@ static struct ipv6_devconf ipv6_devconf __read_mostly = { 
	.disable_ipv6		= 0,

	.accept_dad		= 1,

	.suppress_frag_ndisc	= 1,

	.accept_ra_mtu		= 1,

};



static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
@@ -238,6 +239,7 @@ static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 
	.disable_ipv6		= 0,

	.accept_dad		= 1,

	.suppress_frag_ndisc	= 1,

	.accept_ra_mtu		= 1,

};



/* Check if a valid qdisc is available */
@@ -4380,6 +4382,7 @@ static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 
	array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;

	array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;

	array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;

	array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;

}



static inline size_t inet6_ifla6_size(void)
@@ -5258,6 +5261,13 @@ static struct addrconf_sysctl_table 
			.mode		= 0644,

			.proc_handler	= proc_dointvec,

		},

		{

			.procname	= "accept_ra_mtu",

			.data		= &ipv6_devconf.accept_ra_mtu,

			.maxlen		= sizeof(int),

			.mode		= 0644,

			.proc_handler	= proc_dointvec,

		},

		{

			/* sentinel */

		}

net/ipv6/ndisc.c

+1 −1
Original line number Diff line number Diff line
@@ -1348,7 +1348,7 @@ static void ndisc_router_discovery(struct sk_buff *skb) 
		}

	}



	if (ndopts.nd_opts_mtu) {

	if (ndopts.nd_opts_mtu && in6_dev->cnf.accept_ra_mtu) {

		__be32 n;

		u32 mtu;