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[IPV6]: ROUTE: Add accept_ra_defrtr sysctl.

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This controls whether we accept default router information
in RAs.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YOSHIFUJI Hideaki 2006-03-20 16:55:08 -08:00 committed by David S. Miller
parent 073a8e0e15
commit 65f5c7c114
5 changed files with 26 additions and 1 deletions
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6
Documentation/networking/ip-sysctl.txt
View File

@ -717,6 +717,12 @@ accept_ra - BOOLEAN
Functional default: enabled if local forwarding is disabled.
disabled if local forwarding is enabled.
accept_ra_defrtr - BOOLEAN
Learn default router in Router Advertisement.
Functional default: enabled if accept_ra is enabled.
disabled if accept_ra is disabled.
accept_redirects - BOOLEAN
Accept Redirects.

2
include/linux/ipv6.h
View File

@ -145,6 +145,7 @@ struct ipv6_devconf {
__s32 max_desync_factor;
#endif
__s32 max_addresses;
__s32 accept_ra_defrtr;
void *sysctl;
};
@ -167,6 +168,7 @@ enum {
DEVCONF_MAX_DESYNC_FACTOR,
DEVCONF_MAX_ADDRESSES,
DEVCONF_FORCE_MLD_VERSION,
DEVCONF_ACCEPT_RA_DEFRTR,
DEVCONF_MAX
};

1
include/linux/sysctl.h
View File

@ -531,6 +531,7 @@ enum {
NET_IPV6_MAX_DESYNC_FACTOR=15,
NET_IPV6_MAX_ADDRESSES=16,
NET_IPV6_FORCE_MLD_VERSION=17,
NET_IPV6_ACCEPT_RA_DEFRTR=18,
__NET_IPV6_MAX
};

11
net/ipv6/addrconf.c
View File

@ -165,6 +165,7 @@ struct ipv6_devconf ipv6_devconf = {
.max_desync_factor = MAX_DESYNC_FACTOR,
#endif
.max_addresses = IPV6_MAX_ADDRESSES,
.accept_ra_defrtr = 1,
};
static struct ipv6_devconf ipv6_devconf_dflt = {
@ -186,6 +187,7 @@ static struct ipv6_devconf ipv6_devconf_dflt = {
.max_desync_factor = MAX_DESYNC_FACTOR,
#endif
.max_addresses = IPV6_MAX_ADDRESSES,
.accept_ra_defrtr = 1,
};
/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
@ -3116,6 +3118,7 @@ static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
#endif
array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
}
static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
@ -3568,6 +3571,14 @@ static struct addrconf_sysctl_table
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{
.ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
.procname = "accept_ra_defrtr",
.data = &ipv6_devconf.accept_ra_defrtr,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{
.ctl_name = 0, /* sentinel */
}

7
net/ipv6/ndisc.c
View File

@ -1019,7 +1019,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
struct ra_msg *ra_msg = (struct ra_msg *) skb->h.raw;
struct neighbour *neigh = NULL;
struct inet6_dev *in6_dev;
struct rt6_info *rt;
struct rt6_info *rt = NULL;
int lifetime;
struct ndisc_options ndopts;
int optlen;
@ -1081,6 +1081,9 @@ static void ndisc_router_discovery(struct sk_buff *skb)
(ra_msg->icmph.icmp6_addrconf_other ?
IF_RA_OTHERCONF : 0);
if (!in6_dev->cnf.accept_ra_defrtr)
goto skip_defrtr;
lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
rt = rt6_get_dflt_router(&skb->nh.ipv6h->saddr, skb->dev);
@ -1128,6 +1131,8 @@ static void ndisc_router_discovery(struct sk_buff *skb)
rt->u.dst.metrics[RTAX_HOPLIMIT-1] = ra_msg->icmph.icmp6_hop_limit;
}
skip_defrtr:
/*
* Update Reachable Time and Retrans Timer
*/