leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ipv4: Validate route entry type at insert instead of every lookup.

Browse Source 
fib_semantic_match() requires that if the type doesn't signal an
automatic error, it must be of type RTN_UNICAST, RTN_LOCAL,
RTN_BROADCAST, RTN_ANYCAST, or RTN_MULTICAST.

Checking this every route lookup is pointless work.

Instead validate it during route insertion, via fib_create_info().

Also, there was nothing making sure the type value was less than
RTN_MAX, so add that missing check while we're here.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2011-03-07 14:27:38 -08:00
parent 256ee435b9
commit 4c8237cd76
1 changed files with 30 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
net/ipv4/fib_semantics.c
View File

@ -707,6 +707,9 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
int nhs = 1;
struct net *net = cfg->fc_nlinfo.nl_net;
if (cfg->fc_type > RTN_MAX)
goto err_inval;
/* Fast check to catch the most weird cases */
if (fib_props[cfg->fc_type].scope > cfg->fc_scope)
goto err_inval;
@ -812,6 +815,17 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
if (cfg->fc_gw || cfg->fc_oif || cfg->fc_mp)
goto err_inval;
goto link_it;
} else {
switch (cfg->fc_type) {
case RTN_UNICAST:
case RTN_LOCAL:
case RTN_BROADCAST:
case RTN_ANYCAST:
case RTN_MULTICAST:
break;
default:
goto err_inval;
}
}
if (cfg->fc_scope > RT_SCOPE_HOST)
@ -915,35 +929,23 @@ int fib_semantic_match(struct fib_table *tb, struct list_head *head,
if (fi->fib_flags & RTNH_F_DEAD)
continue;
switch (fa->fa_type) {
case RTN_UNICAST:
case RTN_LOCAL:
case RTN_BROADCAST:
case RTN_ANYCAST:
case RTN_MULTICAST:
for_nexthops(fi) {
if (nh->nh_flags & RTNH_F_DEAD)
continue;
if (!flp->oif || flp->oif == nh->nh_oif)
break;
}
#ifdef CONFIG_IP_ROUTE_MULTIPATH
if (nhsel < fi->fib_nhs) {
nh_sel = nhsel;
goto out_fill_res;
}
#else
if (nhsel < 1)
goto out_fill_res;
#endif
endfor_nexthops(fi);
continue;
default:
pr_warning("fib_semantic_match bad type %#x\n",
fa->fa_type);
return -EINVAL;
for_nexthops(fi) {
if (nh->nh_flags & RTNH_F_DEAD)
continue;
if (!flp->oif || flp->oif == nh->nh_oif)
break;
}
#ifdef CONFIG_IP_ROUTE_MULTIPATH
if (nhsel < fi->fib_nhs) {
nh_sel = nhsel;
goto out_fill_res;
}
#else
if (nhsel < 1)
goto out_fill_res;
#endif
endfor_nexthops(fi);
continue;
}
return err;
}