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ipv6: Pass fib6_result to ip6_rt_cache_alloc 

Change ip6_rt_cache_alloc to take a fib6_result over a fib6_info.

Since ip6_rt_cache_alloc is only the caller, update the
rt6_is_gw_or_nonexthop helper to take fib6_result.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2019-04-16 14:36:01 -07:00 committed by David S. Miller
parent 7e4b512875
commit 85bd05deb3
1 changed files with 26 additions and 22 deletions
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48
net/ipv6/route.c
View File

@ -784,9 +784,10 @@ static struct fib6_info *rt6_select(struct net *net, struct fib6_node *fn,
return match ? match : net->ipv6.fib6_null_entry;
}
static bool rt6_is_gw_or_nonexthop(const struct fib6_info *rt)
static bool rt6_is_gw_or_nonexthop(const struct fib6_result *res)
{
return (rt->fib6_flags & RTF_NONEXTHOP) || rt->fib6_nh.fib_nh_gw_family;
return (res->f6i->fib6_flags & RTF_NONEXTHOP) ||
res->nh->fib_nh_gw_family;
}
#ifdef CONFIG_IPV6_ROUTE_INFO
@ -1174,10 +1175,11 @@ int ip6_ins_rt(struct net *net, struct fib6_info *rt)
return __ip6_ins_rt(rt, &info, NULL);
}
static struct rt6_info *ip6_rt_cache_alloc(struct fib6_info *ort,
static struct rt6_info *ip6_rt_cache_alloc(const struct fib6_result *res,
const struct in6_addr *daddr,
const struct in6_addr *saddr)
{
struct fib6_info *f6i = res->f6i;
struct net_device *dev;
struct rt6_info *rt;
@ -1185,25 +1187,25 @@ static struct rt6_info *ip6_rt_cache_alloc(struct fib6_info *ort,
* Clone the route.
*/
if (!fib6_info_hold_safe(ort))
if (!fib6_info_hold_safe(f6i))
return NULL;
dev = ip6_rt_get_dev_rcu(ort);
dev = ip6_rt_get_dev_rcu(f6i);
rt = ip6_dst_alloc(dev_net(dev), dev, 0);
if (!rt) {
fib6_info_release(ort);
fib6_info_release(f6i);
return NULL;
}
ip6_rt_copy_init(rt, ort);
ip6_rt_copy_init(rt, res->f6i);
rt->rt6i_flags |= RTF_CACHE;
rt->dst.flags |= DST_HOST;
rt->rt6i_dst.addr = *daddr;
rt->rt6i_dst.plen = 128;
if (!rt6_is_gw_or_nonexthop(ort)) {
if (ort->fib6_dst.plen != 128 &&
ipv6_addr_equal(&ort->fib6_dst.addr, daddr))
if (!rt6_is_gw_or_nonexthop(res)) {
if (f6i->fib6_dst.plen != 128 &&
ipv6_addr_equal(&f6i->fib6_dst.addr, daddr))
rt->rt6i_flags |= RTF_ANYCAST;
#ifdef CONFIG_IPV6_SUBTREES
if (rt->rt6i_src.plen && saddr) {
@ -1885,7 +1887,7 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
*/
struct rt6_info *uncached_rt;
uncached_rt = ip6_rt_cache_alloc(res.f6i, &fl6->daddr, NULL);
uncached_rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL);
rcu_read_unlock();
@ -2329,19 +2331,20 @@ static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
if (rt6->rt6i_flags & RTF_CACHE)
rt6_update_exception_stamp_rt(rt6);
} else if (daddr) {
struct fib6_info *from;
struct fib6_result res = {};
struct rt6_info *nrt6;
rcu_read_lock();
from = rcu_dereference(rt6->from);
if (!from) {
res.f6i = rcu_dereference(rt6->from);
if (!res.f6i) {
rcu_read_unlock();
return;
}
nrt6 = ip6_rt_cache_alloc(from, daddr, saddr);
res.nh = &res.f6i->fib6_nh;
nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr);
if (nrt6) {
rt6_do_update_pmtu(nrt6, mtu);
if (rt6_insert_exception(nrt6, from))
if (rt6_insert_exception(nrt6, res.f6i))
dst_release_immediate(&nrt6->dst);
}
rcu_read_unlock();
@ -3364,10 +3367,10 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
{
struct netevent_redirect netevent;
struct rt6_info *rt, *nrt = NULL;
struct fib6_result res = {};
struct ndisc_options ndopts;
struct inet6_dev *in6_dev;
struct neighbour *neigh;
struct fib6_info *from;
struct rd_msg *msg;
int optlen, on_link;
u8 *lladdr;
@ -3450,14 +3453,15 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
NDISC_REDIRECT, &ndopts);
rcu_read_lock();
from = rcu_dereference(rt->from);
res.f6i = rcu_dereference(rt->from);
/* This fib6_info_hold() is safe here because we hold reference to rt
* and rt already holds reference to fib6_info.
*/
fib6_info_hold(from);
fib6_info_hold(res.f6i);
rcu_read_unlock();
nrt = ip6_rt_cache_alloc(from, &msg->dest, NULL);
res.nh = &res.f6i->fib6_nh;
nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL);
if (!nrt)
goto out;
@ -3471,7 +3475,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
* a cached route because rt6_insert_exception() will
* takes care of it
*/
if (rt6_insert_exception(nrt, from)) {
if (rt6_insert_exception(nrt, res.f6i)) {
dst_release_immediate(&nrt->dst);
goto out;
}
@ -3483,7 +3487,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
out:
fib6_info_release(from);
fib6_info_release(res.f6i);
neigh_release(neigh);
}