Subject: [PATCH RFC net-next 13/20] net/ipv6: Move dst flags to booleans in fib entries

From: David Ahern <[email-masked]>
Date: Sun, 25 Feb 2018 11:47:23 -0800

Use bool to hold requests for certain dst settings when a FIB entry
is converted to a dst.

Signed-off-by: David Ahern <[email-masked]>
---
 include/net/ip6_fib.h |  5 ++++-
 net/ipv6/addrconf.c   |  4 ++--
 net/ipv6/route.c      | 29 ++++++++++++++++++++++++-----
 3 files changed, 30 insertions(+), 8 deletions(-)

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 3ba0bb7c7a43..d867b1696927 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -177,7 +177,10 @@ struct rt6_info {
 	u8				fib6_type;
 	u8				exception_bucket_flushed:1,
 					should_flush:1,
-					unused:6;
+					dst_nocount:1,
+					dst_nopolicy:1,
+					dst_host:1,
+					unused:3;
 
 	unsigned long			expires;
 	struct dst_metrics		*fib6_metrics;
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 478f45bf13cf..6ac54498ae71 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1058,7 +1058,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 
 	if (net->ipv6.devconf_all->disable_policy ||
 	    idev->cnf.disable_policy)
-		rt->dst.flags |= DST_NOPOLICY;
+		rt->dst_nopolicy = true;
 
 	neigh_parms_data_state_setall(idev->nd_parms);
 
@@ -5945,7 +5945,7 @@ void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
 			int cpu;
 
 			rcu_read_lock();
-			addrconf_set_nopolicy(ifa->rt, val);
+			ifa->rt->dst_nopolicy = val ? true : false;
 			if (rt->rt6i_pcpu) {
 				for_each_possible_cpu(cpu) {
 					struct rt6_info **rtp;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 066203d2f9d3..61f4f0333c73 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -935,6 +935,20 @@ static int ip6_rt_type_to_error(u8 fib6_type)
 	return fib6_prop[fib6_type];
 }
 
+static unsigned short fib6_info_dst_flags(struct rt6_info *rt)
+{
+	unsigned short flags = 0;
+
+	if (rt->dst_nocount)
+		flags |= DST_NOCOUNT;
+	if (rt->dst_nopolicy)
+		flags |= DST_NOPOLICY;
+	if (rt->dst_host)
+		flags |= DST_HOST;
+
+	return flags;
+}
+
 static void ip6_rt_init_dst_reject(struct rt6_info *rt, struct rt6_info *ort)
 {
 	rt->dst.error = ip6_rt_type_to_error(ort->fib6_type);
@@ -959,6 +973,8 @@ static void ip6_rt_init_dst_reject(struct rt6_info *rt, struct rt6_info *ort)
 
 static void ip6_rt_init_dst(struct rt6_info *rt, struct rt6_info *ort)
 {
+	rt->dst.flags |= fib6_info_dst_flags(ort);
+
 	if (ort->rt6i_flags & RTF_REJECT) {
 		ip6_rt_init_dst_reject(rt, ort);
 		return;
@@ -968,7 +984,6 @@ static void ip6_rt_init_dst(struct rt6_info *rt, struct rt6_info *ort)
 	rt->dst.output = ip6_output;
 
 	if (ort->fib6_type == RTN_LOCAL) {
-		rt->dst.flags |= DST_HOST;
 		rt->dst.input = ip6_input;
 	} else if (ipv6_addr_type(&ort->rt6i_dst.addr) & IPV6_ADDR_MULTICAST) {
 		rt->dst.input = ip6_mc_input;
@@ -1056,11 +1071,12 @@ static bool ip6_hold_safe(struct net *net, struct rt6_info **prt,
 /* called with rcu_lock held */
 static struct rt6_info *ip6_create_rt_rcu(struct rt6_info *rt)
 {
+	unsigned short flags = fib6_info_dst_flags(rt);
 	struct net_device *dev;
 	struct rt6_info *nrt;
 
 	dev = ip6_rt_get_dev_rcu(rt);
-	nrt = __ip6_dst_alloc(dev_net(dev), dev, 0);
+	nrt = __ip6_dst_alloc(dev_net(dev), dev, flags);
 	if (nrt)
 		ip6_rt_copy_init(nrt, rt);
 
@@ -1215,12 +1231,13 @@ static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
 
 static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
 {
+	unsigned short flags = fib6_info_dst_flags(rt);
 	struct net_device *dev;
 	struct rt6_info *pcpu_rt;
 
 	rcu_read_lock();
 	dev = ip6_rt_get_dev_rcu(rt);
-	pcpu_rt = __ip6_dst_alloc(dev_net(dev), dev, rt->dst.flags);
+	pcpu_rt = __ip6_dst_alloc(dev_net(dev), dev, flags);
 	rcu_read_unlock();
 	if (!pcpu_rt)
 		return NULL;
@@ -2768,7 +2785,7 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 	ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
 	rt->rt6i_dst.plen = cfg->fc_dst_len;
 	if (rt->rt6i_dst.plen == 128)
-		rt->dst.flags |= DST_HOST;
+		rt->dst_host = true;
 
 #ifdef CONFIG_IPV6_SUBTREES
 	ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
@@ -3474,10 +3491,12 @@ struct rt6_info *addrconf_dst_alloc(struct net *net,
 	if (!rt)
 		return ERR_PTR(-ENOMEM);
 
+	rt->dst_nocount = true;
+
 	in6_dev_hold(idev);
 	rt->rt6i_idev = idev;
 
-	rt->dst.flags |= DST_HOST;
+	rt->dst_host = true;
 	rt->rt6i_protocol = RTPROT_KERNEL;
 	rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
 	if (anycast) {
-- 
2.11.0