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ipv4: Use const'ify fib_result deep in the route call chains. 

The only troublesome bit here is __mkroute_output which wants
to override res->fi and res->type, compute those in local
variables instead.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2011-02-16 21:44:24 -08:00
parent b6bf3ca032
commit 982721f391
3 changed files with 19 additions and 17 deletions
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2
include/net/ip_fib.h
View File

@ -202,7 +202,7 @@ extern int __net_init fib4_rules_init(struct net *net);
extern void __net_exit fib4_rules_exit(struct net *net);
#ifdef CONFIG_IP_ROUTE_CLASSID
extern u32 fib_rules_tclass(struct fib_result *res);
extern u32 fib_rules_tclass(const struct fib_result *res);
#endif
extern int fib_lookup(struct net *n, struct flowi *flp, struct fib_result *res);

2
net/ipv4/fib_rules.c
View File

@ -47,7 +47,7 @@ struct fib4_rule {
};
#ifdef CONFIG_IP_ROUTE_CLASSID
u32 fib_rules_tclass(struct fib_result *res)
u32 fib_rules_tclass(const struct fib_result *res)
{
return res->r ? ((struct fib4_rule *) res->r)->tclassid : 0;
}

32
net/ipv4/route.c
View File

@ -1787,10 +1787,10 @@ static void rt_init_metrics(struct rtable *rt, struct fib_info *fi)
}
}
static void rt_set_nexthop(struct rtable *rt, struct fib_result *res, u32 itag)
static void rt_set_nexthop(struct rtable *rt, const struct fib_result *res,
struct fib_info *fi, u16 type, u32 itag)
{
struct dst_entry *dst = &rt->dst;
struct fib_info *fi = res->fi;
if (fi) {
if (FIB_RES_GW(*res) &&
@ -1813,7 +1813,7 @@ static void rt_set_nexthop(struct rtable *rt, struct fib_result *res, u32 itag)
#endif
set_class_tag(rt, itag);
#endif
rt->rt_type = res->type;
rt->rt_type = type;
}
static struct rtable *rt_dst_alloc(bool nopolicy, bool noxfrm)
@ -1939,7 +1939,7 @@ static void ip_handle_martian_source(struct net_device *dev,
/* called in rcu_read_lock() section */
static int __mkroute_input(struct sk_buff *skb,
struct fib_result *res,
const struct fib_result *res,
struct in_device *in_dev,
__be32 daddr, __be32 saddr, u32 tos,
struct rtable **result)
@ -2018,7 +2018,7 @@ static int __mkroute_input(struct sk_buff *skb,
rth->dst.output = ip_output;
rth->rt_genid = rt_genid(dev_net(rth->dst.dev));
rt_set_nexthop(rth, res, itag);
rt_set_nexthop(rth, res, res->fi, res->type, itag);
rth->rt_flags = flags;
@ -2319,23 +2319,25 @@ skip_cache:
EXPORT_SYMBOL(ip_route_input_common);
/* called with rcu_read_lock() */
static struct rtable *__mkroute_output(struct fib_result *res,
static struct rtable *__mkroute_output(const struct fib_result *res,
const struct flowi *fl,
const struct flowi *oldflp,
struct net_device *dev_out,
unsigned int flags)
{
struct fib_info *fi = res->fi;
u32 tos = RT_FL_TOS(oldflp);
struct in_device *in_dev;
u16 type = res->type;
struct rtable *rth;
if (ipv4_is_loopback(fl->fl4_src) && !(dev_out->flags & IFF_LOOPBACK))
return ERR_PTR(-EINVAL);
if (ipv4_is_lbcast(fl->fl4_dst))
res->type = RTN_BROADCAST;
type = RTN_BROADCAST;
else if (ipv4_is_multicast(fl->fl4_dst))
res->type = RTN_MULTICAST;
type = RTN_MULTICAST;
else if (ipv4_is_zeronet(fl->fl4_dst))
return ERR_PTR(-EINVAL);
@ -2346,10 +2348,10 @@ static struct rtable *__mkroute_output(struct fib_result *res,
if (!in_dev)
return ERR_PTR(-EINVAL);
if (res->type == RTN_BROADCAST) {
if (type == RTN_BROADCAST) {
flags |= RTCF_BROADCAST | RTCF_LOCAL;
res->fi = NULL;
} else if (res->type == RTN_MULTICAST) {
fi = NULL;
} else if (type == RTN_MULTICAST) {
flags |= RTCF_MULTICAST | RTCF_LOCAL;
if (!ip_check_mc(in_dev, oldflp->fl4_dst, oldflp->fl4_src,
oldflp->proto))
@ -2358,8 +2360,8 @@ static struct rtable *__mkroute_output(struct fib_result *res,
* default one, but do not gateway in this case.
* Yes, it is hack.
*/
if (res->fi && res->prefixlen < 4)
res->fi = NULL;
if (fi && res->prefixlen < 4)
fi = NULL;
}
rth = rt_dst_alloc(IN_DEV_CONF_GET(in_dev, NOPOLICY),
@ -2399,7 +2401,7 @@ static struct rtable *__mkroute_output(struct fib_result *res,
RT_CACHE_STAT_INC(out_slow_mc);
}
#ifdef CONFIG_IP_MROUTE
if (res->type == RTN_MULTICAST) {
if (type == RTN_MULTICAST) {
if (IN_DEV_MFORWARD(in_dev) &&
!ipv4_is_local_multicast(oldflp->fl4_dst)) {
rth->dst.input = ip_mr_input;
@ -2409,7 +2411,7 @@ static struct rtable *__mkroute_output(struct fib_result *res,
#endif
}
rt_set_nexthop(rth, res, 0);
rt_set_nexthop(rth, res, fi, type, 0);
rth->rt_flags = flags;
return rth;