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ipv6: Move gateway checks to a fib6_nh setting 

The gateway setting is not per fib6_info entry but per-fib6_nh. Add a new
fib_nh_has_gw flag to fib6_nh and convert references to RTF_GATEWAY to
the new flag. For IPv6 address the flag is cheaper than checking that
nh_gw is non-0 like IPv4 does.

While this increases fib6_nh by 8-bytes, the effective allocation size of
a fib6_info is unchanged. The 8 bytes is recovered later with a
fib_nh_common change.

Signed-off-by: David Ahern <dsahern@gmail.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2019-03-27 20:53:52 -07:00 committed by David S. Miller
parent dac7d0f270
commit 2b2450ca4a
7 changed files with 41 additions and 30 deletions
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4
drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
View File

@ -4913,7 +4913,7 @@ static void mlxsw_sp_rt6_destroy(struct mlxsw_sp_rt6 *mlxsw_sp_rt6)
static bool mlxsw_sp_fib6_rt_can_mp(const struct fib6_info *rt)
{
/* RTF_CACHE routes are ignored */
return (rt->fib6_flags & (RTF_GATEWAY | RTF_ADDRCONF)) == RTF_GATEWAY;
return !(rt->fib6_flags & RTF_ADDRCONF) && rt->fib6_nh.fib_nh_has_gw;
}
static struct fib6_info *
@ -5053,7 +5053,7 @@ static void mlxsw_sp_nexthop6_fini(struct mlxsw_sp *mlxsw_sp,
static bool mlxsw_sp_rt6_is_gateway(const struct mlxsw_sp *mlxsw_sp,
const struct fib6_info *rt)
{
return rt->fib6_flags & RTF_GATEWAY ||
return rt->fib6_nh.fib_nh_has_gw ||
mlxsw_sp_nexthop6_ipip_type(mlxsw_sp, rt, NULL);
}

1
include/net/ip6_fib.h
View File

@ -126,6 +126,7 @@ struct rt6_exception {
struct fib6_nh {
struct in6_addr nh_gw;
bool fib_nh_has_gw;
struct net_device *nh_dev;
struct lwtunnel_state *nh_lwtstate;

4
include/net/ip6_route.h
View File

@ -68,8 +68,8 @@ static inline bool rt6_need_strict(const struct in6_addr *daddr)
static inline bool rt6_qualify_for_ecmp(const struct fib6_info *f6i)
{
return (f6i->fib6_flags & (RTF_GATEWAY|RTF_ADDRCONF|RTF_DYNAMIC)) ==
RTF_GATEWAY;
return !(f6i->fib6_flags & (RTF_ADDRCONF|RTF_DYNAMIC)) &&
f6i->fib6_nh.fib_nh_has_gw;
}
void ip6_route_input(struct sk_buff *skb);

2
net/core/filter.c
View File

@ -4751,7 +4751,7 @@ static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
if (f6i->fib6_nh.nh_lwtstate)
return BPF_FIB_LKUP_RET_UNSUPP_LWT;
if (f6i->fib6_flags & RTF_GATEWAY)
if (f6i->fib6_nh.fib_nh_has_gw)
*dst = f6i->fib6_nh.nh_gw;
dev = f6i->fib6_nh.nh_dev;

25
net/ipv6/addrconf.c
View File

@ -173,7 +173,8 @@ static int addrconf_ifdown(struct net_device *dev, int how);
static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
int plen,
const struct net_device *dev,
u32 flags, u32 noflags);
u32 flags, u32 noflags,
bool no_gw);
static void addrconf_dad_start(struct inet6_ifaddr *ifp);
static void addrconf_dad_work(struct work_struct *w);
@ -1230,10 +1231,8 @@ cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_r
{
struct fib6_info *f6i;
f6i = addrconf_get_prefix_route(&ifp->addr,
ifp->prefix_len,
ifp->idev->dev,
0, RTF_GATEWAY | RTF_DEFAULT);
f6i = addrconf_get_prefix_route(&ifp->addr, ifp->prefix_len,
ifp->idev->dev, 0, RTF_DEFAULT, true);
if (f6i) {
if (del_rt)
ip6_del_rt(dev_net(ifp->idev->dev), f6i);
@ -2402,7 +2401,8 @@ addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
int plen,
const struct net_device *dev,
u32 flags, u32 noflags)
u32 flags, u32 noflags,
bool no_gw)
{
struct fib6_node *fn;
struct fib6_info *rt = NULL;
@ -2421,6 +2421,8 @@ static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
for_each_fib6_node_rt_rcu(fn) {
if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex)
continue;
if (no_gw && rt->fib6_nh.fib_nh_has_gw)
continue;
if ((rt->fib6_flags & flags) != flags)
continue;
if ((rt->fib6_flags & noflags) != 0)
@ -2717,7 +2719,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
pinfo->prefix_len,
dev,
RTF_ADDRCONF | RTF_PREFIX_RT,
RTF_GATEWAY | RTF_DEFAULT);
RTF_DEFAULT, true);
if (rt) {
/* Autoconf prefix route */
@ -4588,10 +4590,8 @@ static int modify_prefix_route(struct inet6_ifaddr *ifp,
struct fib6_info *f6i;
u32 prio;
f6i = addrconf_get_prefix_route(&ifp->addr,
ifp->prefix_len,
ifp->idev->dev,
0, RTF_GATEWAY | RTF_DEFAULT);
f6i = addrconf_get_prefix_route(&ifp->addr, ifp->prefix_len,
ifp->idev->dev, 0, RTF_DEFAULT, true);
if (!f6i)
return -ENOENT;
@ -5972,7 +5972,8 @@ static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
struct fib6_info *rt;
rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
ifp->idev->dev, 0, 0);
ifp->idev->dev, 0, 0,
false);
if (rt)
ip6_del_rt(net, rt);
}

9
net/ipv6/ip6_fib.c
View File

@ -2294,6 +2294,7 @@ static int ipv6_route_seq_show(struct seq_file *seq, void *v)
{
struct fib6_info *rt = v;
struct ipv6_route_iter *iter = seq->private;
unsigned int flags = rt->fib6_flags;
const struct net_device *dev;
seq_printf(seq, "%pi6 %02x ", &rt->fib6_dst.addr, rt->fib6_dst.plen);
@ -2303,15 +2304,17 @@ static int ipv6_route_seq_show(struct seq_file *seq, void *v)
#else
seq_puts(seq, "00000000000000000000000000000000 00 ");
#endif
if (rt->fib6_flags & RTF_GATEWAY)
if (rt->fib6_nh.fib_nh_has_gw) {
flags |= RTF_GATEWAY;
seq_printf(seq, "%pi6", &rt->fib6_nh.nh_gw);
else
} else {
seq_puts(seq, "00000000000000000000000000000000");
}
dev = rt->fib6_nh.nh_dev;
seq_printf(seq, " %08x %08x %08x %08x %8s\n",
rt->fib6_metric, atomic_read(&rt->fib6_ref), 0,
rt->fib6_flags, dev ? dev->name : "");
flags, dev ? dev->name : "");
iter->w.leaf = NULL;
return 0;
}

26
net/ipv6/route.c
View File

@ -533,7 +533,7 @@ static void rt6_probe(struct fib6_info *rt)
* Router Reachability Probe MUST be rate-limited
* to no more than one per minute.
*/
if (!rt || !(rt->fib6_flags & RTF_GATEWAY))
if (!rt || !rt->fib6_nh.fib_nh_has_gw)
return;
nh_gw = &rt->fib6_nh.nh_gw;
@ -595,7 +595,7 @@ static inline enum rt6_nud_state rt6_check_neigh(struct fib6_info *rt)
struct neighbour *neigh;
if (rt->fib6_flags & RTF_NONEXTHOP ||
!(rt->fib6_flags & RTF_GATEWAY))
!rt->fib6_nh.fib_nh_has_gw)
return RT6_NUD_SUCCEED;
rcu_read_lock_bh();
@ -784,7 +784,7 @@ static struct fib6_info *rt6_select(struct net *net, struct fib6_node *fn,
static bool rt6_is_gw_or_nonexthop(const struct fib6_info *rt)
{
return (rt->fib6_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
return (rt->fib6_flags & RTF_NONEXTHOP) || rt->fib6_nh.fib_nh_has_gw;
}
#ifdef CONFIG_IPV6_ROUTE_INFO
@ -989,8 +989,11 @@ static void ip6_rt_copy_init(struct rt6_info *rt, struct fib6_info *ort)
rt->rt6i_dst = ort->fib6_dst;
rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL;
rt->rt6i_gateway = ort->fib6_nh.nh_gw;
rt->rt6i_flags = ort->fib6_flags;
if (ort->fib6_nh.fib_nh_has_gw) {
rt->rt6i_gateway = ort->fib6_nh.nh_gw;
rt->rt6i_flags |= RTF_GATEWAY;
}
rt6_set_from(rt, ort);
#ifdef CONFIG_IPV6_SUBTREES
rt->rt6i_src = ort->fib6_src;
@ -1872,7 +1875,7 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
rcu_read_unlock();
return rt;
} else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
!(f6i->fib6_flags & RTF_GATEWAY))) {
!f6i->fib6_nh.fib_nh_has_gw)) {
/* Create a RTF_CACHE clone which will not be
* owned by the fib6 tree. It is for the special case where
* the daddr in the skb during the neighbor look-up is different
@ -2442,7 +2445,7 @@ restart:
continue;
if (rt->fib6_flags & RTF_REJECT)
break;
if (!(rt->fib6_flags & RTF_GATEWAY))
if (!rt->fib6_nh.fib_nh_has_gw)
continue;
if (fl6->flowi6_oif != rt->fib6_nh.nh_dev->ifindex)
continue;
@ -2986,6 +2989,7 @@ int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
goto out;
fib6_nh->nh_gw = cfg->fc_gateway;
fib6_nh->fib_nh_has_gw = 1;
}
err = -ENODEV;
@ -3121,7 +3125,7 @@ static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
rt->fib6_table = table;
rt->fib6_metric = cfg->fc_metric;
rt->fib6_type = cfg->fc_type;
rt->fib6_flags = cfg->fc_flags;
rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY;
ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
rt->fib6_dst.plen = cfg->fc_dst_len;
@ -3490,7 +3494,8 @@ static struct fib6_info *rt6_get_route_info(struct net *net,
for_each_fib6_node_rt_rcu(fn) {
if (rt->fib6_nh.nh_dev->ifindex != ifindex)
continue;
if ((rt->fib6_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
if (!(rt->fib6_flags & RTF_ROUTEINFO) ||
!rt->fib6_nh.fib_nh_has_gw)
continue;
if (!ipv6_addr_equal(&rt->fib6_nh.nh_gw, gwaddr))
continue;
@ -3811,7 +3816,7 @@ void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
fib6_clean_all(net, fib6_remove_prefsrc, &adni);
}
#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT)
/* Remove routers and update dst entries when gateway turn into host. */
static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
@ -3819,6 +3824,7 @@ static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
struct in6_addr *gateway = (struct in6_addr *)arg;
if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) &&
rt->fib6_nh.fib_nh_has_gw &&
ipv6_addr_equal(gateway, &rt->fib6_nh.nh_gw)) {
return -1;
}
@ -4607,7 +4613,7 @@ static int rt6_nexthop_info(struct sk_buff *skb, struct fib6_info *rt,
rcu_read_unlock();
}
if (rt->fib6_flags & RTF_GATEWAY) {
if (rt->fib6_nh.fib_nh_has_gw) {
if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->fib6_nh.nh_gw) < 0)
goto nla_put_failure;
}