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ipv6: Handle all fib6_nh in a nexthop in exception handling 

Add a hook in rt6_flush_exceptions, rt6_remove_exception_rt,
rt6_update_exception_stamp_rt, and rt6_age_exceptions to handle
nexthop struct in a fib6_info.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2019-06-08 14:53:28 -07:00 committed by David S. Miller
parent 2c170e0753
commit e659ba31d8
1 changed files with 108 additions and 3 deletions
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111
net/ipv6/route.c
View File

@ -1742,9 +1742,22 @@ out:
spin_unlock_bh(&rt6_exception_lock);
}
static int rt6_nh_flush_exceptions(struct fib6_nh *nh, void *arg)
{
struct fib6_info *f6i = arg;
fib6_nh_flush_exceptions(nh, f6i);
return 0;
}
void rt6_flush_exceptions(struct fib6_info *f6i)
{
fib6_nh_flush_exceptions(f6i->fib6_nh, f6i);
if (f6i->nh)
nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_flush_exceptions,
f6i);
else
fib6_nh_flush_exceptions(f6i->fib6_nh, f6i);
}
/* Find cached rt in the hash table inside passed in rt
@ -1831,6 +1844,23 @@ static int fib6_nh_remove_exception(const struct fib6_nh *nh, int plen,
return err;
}
struct fib6_nh_excptn_arg {
struct rt6_info *rt;
int plen;
};
static int rt6_nh_remove_exception_rt(struct fib6_nh *nh, void *_arg)
{
struct fib6_nh_excptn_arg *arg = _arg;
int err;
err = fib6_nh_remove_exception(nh, arg->plen, arg->rt);
if (err == 0)
return 1;
return 0;
}
static int rt6_remove_exception_rt(struct rt6_info *rt)
{
struct fib6_info *from;
@ -1839,6 +1869,20 @@ static int rt6_remove_exception_rt(struct rt6_info *rt)
if (!from || !(rt->rt6i_flags & RTF_CACHE))
return -EINVAL;
if (from->nh) {
struct fib6_nh_excptn_arg arg = {
.rt = rt,
.plen = from->fib6_src.plen
};
int rc;
/* rc = 1 means an entry was found */
rc = nexthop_for_each_fib6_nh(from->nh,
rt6_nh_remove_exception_rt,
&arg);
return rc ? 0 : -ENOENT;
}
return fib6_nh_remove_exception(from->fib6_nh,
from->fib6_src.plen, rt);
}
@ -1869,9 +1913,33 @@ static void fib6_nh_update_exception(const struct fib6_nh *nh, int plen,
rt6_ex->stamp = jiffies;
}
struct fib6_nh_match_arg {
const struct net_device *dev;
const struct in6_addr *gw;
struct fib6_nh *match;
};
/* determine if fib6_nh has given device and gateway */
static int fib6_nh_find_match(struct fib6_nh *nh, void *_arg)
{
struct fib6_nh_match_arg *arg = _arg;
if (arg->dev != nh->fib_nh_dev ||
(arg->gw && !nh->fib_nh_gw_family) ||
(!arg->gw && nh->fib_nh_gw_family) ||
(arg->gw && !ipv6_addr_equal(arg->gw, &nh->fib_nh_gw6)))
return 0;
arg->match = nh;
/* found a match, break the loop */
return 1;
}
static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
{
struct fib6_info *from;
struct fib6_nh *fib6_nh;
rcu_read_lock();
@ -1879,7 +1947,21 @@ static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
if (!from || !(rt->rt6i_flags & RTF_CACHE))
goto unlock;
fib6_nh_update_exception(from->fib6_nh, from->fib6_src.plen, rt);
if (from->nh) {
struct fib6_nh_match_arg arg = {
.dev = rt->dst.dev,
.gw = &rt->rt6i_gateway,
};
nexthop_for_each_fib6_nh(from->nh, fib6_nh_find_match, &arg);
if (!arg.match)
return;
fib6_nh = arg.match;
} else {
fib6_nh = from->fib6_nh;
}
fib6_nh_update_exception(fib6_nh, from->fib6_src.plen, rt);
unlock:
rcu_read_unlock();
}
@ -2041,11 +2123,34 @@ static void fib6_nh_age_exceptions(const struct fib6_nh *nh,
rcu_read_unlock_bh();
}
struct fib6_nh_age_excptn_arg {
struct fib6_gc_args *gc_args;
unsigned long now;
};
static int rt6_nh_age_exceptions(struct fib6_nh *nh, void *_arg)
{
struct fib6_nh_age_excptn_arg *arg = _arg;
fib6_nh_age_exceptions(nh, arg->gc_args, arg->now);
return 0;
}
void rt6_age_exceptions(struct fib6_info *f6i,
struct fib6_gc_args *gc_args,
unsigned long now)
{
fib6_nh_age_exceptions(f6i->fib6_nh, gc_args, now);
if (f6i->nh) {
struct fib6_nh_age_excptn_arg arg = {
.gc_args = gc_args,
.now = now
};
nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_age_exceptions,
&arg);
} else {
fib6_nh_age_exceptions(f6i->fib6_nh, gc_args, now);
}
}
/* must be called with rcu lock held */