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Message-Id: <20180418223906.16650-8-dsahern@gmail.com>
Date: Wed, 18 Apr 2018 15:39:05 -0700
From: David Ahern <dsahern@...il.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, idosch@...sch.org, roopa@...ulusnetworks.com,
eric.dumazet@...il.com, weiwan@...gle.com, kafai@...com,
yoshfuji@...ux-ipv6.org, David Ahern <dsahern@...il.com>
Subject: [PATCH net-next 7/8] net/ipv6: Remove fib6_idev
fib6_idev can be obtained from __in6_dev_get on the nexthop device
rather than caching it in the fib6_info. Remove it.
Signed-off-by: David Ahern <dsahern@...il.com>
---
include/net/ip6_fib.h | 1 -
net/ipv6/ip6_fib.c | 2 --
net/ipv6/route.c | 66 ++++++++++++++++++++++++++++++++++++---------------
3 files changed, 47 insertions(+), 22 deletions(-)
diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index bd11c990c353..642211174692 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -147,7 +147,6 @@ struct fib6_info {
unsigned int fib6_nsiblings;
atomic_t fib6_ref;
- struct inet6_dev *fib6_idev;
unsigned long expires;
struct dst_metrics *fib6_metrics;
#define fib6_pmtu fib6_metrics->metrics[RTAX_MTU-1]
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 353f0b3e7b0d..f936e91a8c65 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -197,8 +197,6 @@ void fib6_info_destroy(struct fib6_info *f6i)
}
}
- if (f6i->fib6_idev)
- in6_dev_put(f6i->fib6_idev);
if (f6i->fib6_nh.nh_dev)
dev_put(f6i->fib6_nh.nh_dev);
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 8cf4f0623229..08cae7323776 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -525,15 +525,17 @@ static void rt6_probe(struct fib6_info *rt)
rcu_read_lock_bh();
neigh = __ipv6_neigh_lookup_noref(dev, nh_gw);
if (neigh) {
+ struct inet6_dev *idev;
+
if (neigh->nud_state & NUD_VALID)
goto out;
+ idev = __in6_dev_get(dev);
work = NULL;
write_lock(&neigh->lock);
if (!(neigh->nud_state & NUD_VALID) &&
time_after(jiffies,
- neigh->updated +
- rt->fib6_idev->cnf.rtr_probe_interval)) {
+ neigh->updated + idev->cnf.rtr_probe_interval)) {
work = kmalloc(sizeof(*work), GFP_ATOMIC);
if (work)
__neigh_set_probe_once(neigh);
@@ -622,18 +624,32 @@ static int rt6_score_route(struct fib6_info *rt, int oif, int strict)
return m;
}
+/* called with rc_read_lock held */
+static inline bool fib6_ignore_linkdown(const struct fib6_info *f6i)
+{
+ const struct net_device *dev = fib6_info_nh_dev(f6i);
+ bool rc = false;
+
+ if (dev) {
+ const struct inet6_dev *idev = __in6_dev_get(dev);
+
+ rc = !!idev->cnf.ignore_routes_with_linkdown;
+ }
+
+ return rc;
+}
+
static struct fib6_info *find_match(struct fib6_info *rt, int oif, int strict,
int *mpri, struct fib6_info *match,
bool *do_rr)
{
int m;
bool match_do_rr = false;
- struct inet6_dev *idev = rt->fib6_idev;
if (rt->fib6_nh.nh_flags & RTNH_F_DEAD)
goto out;
- if (idev->cnf.ignore_routes_with_linkdown &&
+ if (fib6_ignore_linkdown(rt) &&
rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN &&
!(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
goto out;
@@ -957,12 +973,12 @@ static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from)
static void ip6_rt_copy_init(struct rt6_info *rt, struct fib6_info *ort)
{
+ struct net_device *dev = fib6_info_nh_dev(ort);
+
ip6_rt_init_dst(rt, ort);
rt->rt6i_dst = ort->fib6_dst;
- rt->rt6i_idev = ort->fib6_idev;
- if (rt->rt6i_idev)
- in6_dev_hold(rt->rt6i_idev);
+ rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL;
rt->rt6i_gateway = ort->fib6_nh.nh_gw;
rt->rt6i_flags = ort->fib6_flags;
rt6_set_from(rt, ort);
@@ -1355,7 +1371,18 @@ static unsigned int fib6_mtu(const struct fib6_info *rt)
{
unsigned int mtu;
- mtu = rt->fib6_pmtu ? : rt->fib6_idev->cnf.mtu6;
+ if (rt->fib6_pmtu) {
+ mtu = rt->fib6_pmtu;
+ } else {
+ struct net_device *dev = fib6_info_nh_dev(rt);
+ struct inet6_dev *idev;
+
+ rcu_read_lock();
+ idev = __in6_dev_get(dev);
+ mtu = idev->cnf.mtu6;
+ rcu_read_unlock();
+ }
+
mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
return mtu - lwtunnel_headroom(rt->fib6_nh.nh_lwtstate, mtu);
@@ -2985,11 +3012,13 @@ static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
rt->fib6_nh.nh_flags |= RTNH_F_LINKDOWN;
rt->fib6_nh.nh_flags |= (cfg->fc_flags & RTNH_F_ONLINK);
rt->fib6_nh.nh_dev = dev;
- rt->fib6_idev = idev;
rt->fib6_table = table;
cfg->fc_nlinfo.nl_net = dev_net(dev);
+ if (idev)
+ in6_dev_put(idev);
+
return rt;
out:
if (dev)
@@ -3425,8 +3454,11 @@ static void __rt6_purge_dflt_routers(struct net *net,
restart:
rcu_read_lock();
for_each_fib6_node_rt_rcu(&table->tb6_root) {
+ struct net_device *dev = fib6_info_nh_dev(rt);
+ struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL;
+
if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
- (!rt->fib6_idev || rt->fib6_idev->cnf.accept_ra != 2)) {
+ (!idev || idev->cnf.accept_ra != 2)) {
fib6_info_hold(rt);
rcu_read_unlock();
ip6_del_rt(net, rt);
@@ -3585,10 +3617,6 @@ struct fib6_info *addrconf_f6i_alloc(struct net *net,
return ERR_PTR(-ENOMEM);
f6i->dst_nocount = true;
-
- in6_dev_hold(idev);
- f6i->fib6_idev = idev;
-
f6i->dst_host = true;
f6i->fib6_protocol = RTPROT_KERNEL;
f6i->fib6_flags = RTF_UP | RTF_NONEXTHOP;
@@ -3706,7 +3734,7 @@ static bool rt6_is_dead(const struct fib6_info *rt)
{
if (rt->fib6_nh.nh_flags & RTNH_F_DEAD ||
(rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN &&
- rt->fib6_idev->cnf.ignore_routes_with_linkdown))
+ fib6_ignore_linkdown(rt)))
return true;
return false;
@@ -4424,8 +4452,11 @@ static int rt6_nexthop_info(struct sk_buff *skb, struct fib6_info *rt,
if (rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN) {
*flags |= RTNH_F_LINKDOWN;
- if (rt->fib6_idev->cnf.ignore_routes_with_linkdown)
+
+ rcu_read_lock();
+ if (fib6_ignore_linkdown(rt))
*flags |= RTNH_F_DEAD;
+ rcu_read_unlock();
}
if (rt->fib6_flags & RTF_GATEWAY) {
@@ -4800,7 +4831,6 @@ static int ip6_route_dev_notify(struct notifier_block *this,
if (event == NETDEV_REGISTER) {
net->ipv6.fib6_null_entry->fib6_nh.nh_dev = dev;
- net->ipv6.fib6_null_entry->fib6_idev = in6_dev_get(dev);
net->ipv6.ip6_null_entry->dst.dev = dev;
net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
@@ -4814,7 +4844,6 @@ static int ip6_route_dev_notify(struct notifier_block *this,
/* NETDEV_UNREGISTER could be fired for multiple times by
* netdev_wait_allrefs(). Make sure we only call this once.
*/
- in6_dev_put_clear(&net->ipv6.fib6_null_entry->fib6_idev);
in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev);
@@ -5137,7 +5166,6 @@ void __init ip6_route_init_special_entries(void)
* the loopback reference in rt6_info will not be taken, do it
* manually for init_net */
init_net.ipv6.fib6_null_entry->fib6_nh.nh_dev = init_net.loopback_dev;
- init_net.ipv6.fib6_null_entry->fib6_idev = in6_dev_get(init_net.loopback_dev);
init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
--
2.11.0
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