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net: Change nhc_flags to unsigned char

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nhc_flags holds the RTNH_F flags for a given nexthop (fib{6}_nh).
All of the RTNH_F_ flags fit in an unsigned char, and since the API to
userspace (rtnh_flags and lower byte of rtm_flags) is 1 byte it can not
grow. Make nhc_flags in fib_nh_common an unsigned char and shrink the
size of the struct by 8, from 56 to 48 bytes.

Update the flags arguments for up netdevice events and fib_nexthop_info
which determines the RTNH_F flags to return on a dump/event. The RTNH_F
flags are passed in the lower byte of rtm_flags which is an unsigned int
so use a temp variable for the flags to fib_nexthop_info and combine
with rtm_flags in the caller.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2019-04-23 08:48:09 -07:00 committed by David S. Miller
parent ffa8ce54be
commit ecc5663cce
4 changed files with 17 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/ip6_route.h
View File

@ -182,7 +182,7 @@ int rt6_dump_route(struct fib6_info *f6i, void *p_arg);
void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
void rt6_sync_up(struct net_device *dev, unsigned int nh_flags);
void rt6_sync_up(struct net_device *dev, unsigned char nh_flags);
void rt6_disable_ip(struct net_device *dev, unsigned long event);
void rt6_sync_down_dev(struct net_device *dev, unsigned long event);
void rt6_multipath_rebalance(struct fib6_info *f6i);

8
include/net/ip_fib.h
View File

@ -83,11 +83,11 @@ struct fnhe_hash_bucket {
struct fib_nh_common {
struct net_device *nhc_dev;
int nhc_oif;
unsigned int nhc_flags;
struct lwtunnel_state *nhc_lwtstate;
unsigned char nhc_scope;
u8 nhc_family;
u8 nhc_gw_family;
unsigned char nhc_flags;
struct lwtunnel_state *nhc_lwtstate;
union {
__be32 ipv4;
@ -425,7 +425,7 @@ int fib_unmerge(struct net *net);
int ip_fib_check_default(__be32 gw, struct net_device *dev);
int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
int fib_sync_down_addr(struct net_device *dev, __be32 local);
int fib_sync_up(struct net_device *dev, unsigned int nh_flags);
int fib_sync_up(struct net_device *dev, unsigned char nh_flags);
void fib_sync_mtu(struct net_device *dev, u32 orig_mtu);
#ifdef CONFIG_IP_ROUTE_MULTIPATH
@ -500,7 +500,7 @@ int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
struct netlink_callback *cb);
int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh,
unsigned int *flags, bool skip_oif);
unsigned char *flags, bool skip_oif);
int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nh,
int nh_weight);
#endif /* _NET_FIB_H */

8
net/ipv4/fib_semantics.c
View File

@ -1444,7 +1444,7 @@ failure:
}
int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nhc,
unsigned int *flags, bool skip_oif)
unsigned char *flags, bool skip_oif)
{
if (nhc->nhc_flags & RTNH_F_DEAD)
*flags |= RTNH_F_DEAD;
@ -1520,7 +1520,7 @@ int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nhc,
{
const struct net_device *dev = nhc->nhc_dev;
struct rtnexthop *rtnh;
unsigned int flags = 0;
unsigned char flags = 0;
rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
if (!rtnh)
@ -1619,7 +1619,7 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
goto nla_put_failure;
if (fi->fib_nhs == 1) {
struct fib_nh *nh = &fi->fib_nh[0];
unsigned int flags = 0;
unsigned char flags = 0;
if (fib_nexthop_info(skb, &nh->nh_common, &flags, false) < 0)
goto nla_put_failure;
@ -1902,7 +1902,7 @@ out:
* Dead device goes up. We wake up dead nexthops.
* It takes sense only on multipath routes.
*/
int fib_sync_up(struct net_device *dev, unsigned int nh_flags)
int fib_sync_up(struct net_device *dev, unsigned char nh_flags)
{
struct fib_info *prev_fi;
unsigned int hash;

12
net/ipv6/route.c
View File

@ -3912,7 +3912,7 @@ void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
struct arg_netdev_event {
const struct net_device *dev;
union {
unsigned int nh_flags;
unsigned char nh_flags;
unsigned long event;
};
};
@ -4025,7 +4025,7 @@ static int fib6_ifup(struct fib6_info *rt, void *p_arg)
return 0;
}
void rt6_sync_up(struct net_device *dev, unsigned int nh_flags)
void rt6_sync_up(struct net_device *dev, unsigned char nh_flags)
{
struct arg_netdev_event arg = {
.dev = dev,
@ -4082,7 +4082,7 @@ static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt,
static void rt6_multipath_nh_flags_set(struct fib6_info *rt,
const struct net_device *dev,
unsigned int nh_flags)
unsigned char nh_flags)
{
struct fib6_info *iter;
@ -4794,9 +4794,13 @@ static int rt6_fill_node(struct net *net, struct sk_buff *skb,
nla_nest_end(skb, mp);
} else {
unsigned char nh_flags = 0;
if (fib_nexthop_info(skb, &rt->fib6_nh.nh_common,
&rtm->rtm_flags, false) < 0)
&nh_flags, false) < 0)
goto nla_put_failure;
rtm->rtm_flags |= nh_flags;
}
if (rt6_flags & RTF_EXPIRES) {