mirror of
https://github.com/torvalds/linux.git
synced 2024-11-23 20:51:44 +00:00
ipv4: Refactor fib_check_nh
fib_check_nh is currently huge covering multiple uses cases - device only, device + gateway, and device + gateway with ONLINK. The next patch adds validation checks for IPv6 which only further complicates it. So, break fib_check_nh into 2 helpers - one for gateway validation and one for device only. 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
David S. Miller
parent
a4ea5d43c8
commit
448d724819
@ -885,134 +885,150 @@ bool fib_metrics_match(struct fib_config *cfg, struct fib_info *fi)
|
||||
* |
|
||||
* |-> {local prefix} (terminal node)
|
||||
*/
|
||||
static int fib_check_nh(struct fib_config *cfg, struct fib_nh *nh,
|
||||
struct netlink_ext_ack *extack)
|
||||
static int fib_check_nh_v4_gw(struct net *net, struct fib_nh *nh, u32 table,
|
||||
u8 scope, struct netlink_ext_ack *extack)
|
||||
{
|
||||
int err = 0;
|
||||
struct net *net;
|
||||
struct net_device *dev;
|
||||
struct fib_result res;
|
||||
int err;
|
||||
|
||||
net = cfg->fc_nlinfo.nl_net;
|
||||
if (nh->fib_nh_gw4) {
|
||||
struct fib_result res;
|
||||
if (nh->fib_nh_flags & RTNH_F_ONLINK) {
|
||||
unsigned int addr_type;
|
||||
|
||||
if (nh->fib_nh_flags & RTNH_F_ONLINK) {
|
||||
unsigned int addr_type;
|
||||
|
||||
if (cfg->fc_scope >= RT_SCOPE_LINK) {
|
||||
NL_SET_ERR_MSG(extack,
|
||||
"Nexthop has invalid scope");
|
||||
return -EINVAL;
|
||||
}
|
||||
dev = __dev_get_by_index(net, nh->fib_nh_oif);
|
||||
if (!dev) {
|
||||
NL_SET_ERR_MSG(extack, "Nexthop device required for onlink");
|
||||
return -ENODEV;
|
||||
}
|
||||
if (!(dev->flags & IFF_UP)) {
|
||||
NL_SET_ERR_MSG(extack,
|
||||
"Nexthop device is not up");
|
||||
return -ENETDOWN;
|
||||
}
|
||||
addr_type = inet_addr_type_dev_table(net, dev,
|
||||
nh->fib_nh_gw4);
|
||||
if (addr_type != RTN_UNICAST) {
|
||||
NL_SET_ERR_MSG(extack,
|
||||
"Nexthop has invalid gateway");
|
||||
return -EINVAL;
|
||||
}
|
||||
if (!netif_carrier_ok(dev))
|
||||
nh->fib_nh_flags |= RTNH_F_LINKDOWN;
|
||||
nh->fib_nh_dev = dev;
|
||||
dev_hold(dev);
|
||||
nh->fib_nh_scope = RT_SCOPE_LINK;
|
||||
return 0;
|
||||
if (scope >= RT_SCOPE_LINK) {
|
||||
NL_SET_ERR_MSG(extack, "Nexthop has invalid scope");
|
||||
return -EINVAL;
|
||||
}
|
||||
rcu_read_lock();
|
||||
{
|
||||
struct fib_table *tbl = NULL;
|
||||
struct flowi4 fl4 = {
|
||||
.daddr = nh->fib_nh_gw4,
|
||||
.flowi4_scope = cfg->fc_scope + 1,
|
||||
.flowi4_oif = nh->fib_nh_oif,
|
||||
.flowi4_iif = LOOPBACK_IFINDEX,
|
||||
};
|
||||
|
||||
/* It is not necessary, but requires a bit of thinking */
|
||||
if (fl4.flowi4_scope < RT_SCOPE_LINK)
|
||||
fl4.flowi4_scope = RT_SCOPE_LINK;
|
||||
|
||||
if (cfg->fc_table)
|
||||
tbl = fib_get_table(net, cfg->fc_table);
|
||||
|
||||
if (tbl)
|
||||
err = fib_table_lookup(tbl, &fl4, &res,
|
||||
FIB_LOOKUP_IGNORE_LINKSTATE |
|
||||
FIB_LOOKUP_NOREF);
|
||||
|
||||
/* on error or if no table given do full lookup. This
|
||||
* is needed for example when nexthops are in the local
|
||||
* table rather than the given table
|
||||
*/
|
||||
if (!tbl || err) {
|
||||
err = fib_lookup(net, &fl4, &res,
|
||||
FIB_LOOKUP_IGNORE_LINKSTATE);
|
||||
}
|
||||
|
||||
if (err) {
|
||||
NL_SET_ERR_MSG(extack,
|
||||
"Nexthop has invalid gateway");
|
||||
rcu_read_unlock();
|
||||
return err;
|
||||
}
|
||||
dev = __dev_get_by_index(net, nh->fib_nh_oif);
|
||||
if (!dev) {
|
||||
NL_SET_ERR_MSG(extack, "Nexthop device required for onlink");
|
||||
return -ENODEV;
|
||||
}
|
||||
err = -EINVAL;
|
||||
if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) {
|
||||
if (!(dev->flags & IFF_UP)) {
|
||||
NL_SET_ERR_MSG(extack, "Nexthop device is not up");
|
||||
return -ENETDOWN;
|
||||
}
|
||||
addr_type = inet_addr_type_dev_table(net, dev, nh->fib_nh_gw4);
|
||||
if (addr_type != RTN_UNICAST) {
|
||||
NL_SET_ERR_MSG(extack, "Nexthop has invalid gateway");
|
||||
return -EINVAL;
|
||||
}
|
||||
if (!netif_carrier_ok(dev))
|
||||
nh->fib_nh_flags |= RTNH_F_LINKDOWN;
|
||||
nh->fib_nh_dev = dev;
|
||||
dev_hold(dev);
|
||||
nh->fib_nh_scope = RT_SCOPE_LINK;
|
||||
return 0;
|
||||
}
|
||||
rcu_read_lock();
|
||||
{
|
||||
struct fib_table *tbl = NULL;
|
||||
struct flowi4 fl4 = {
|
||||
.daddr = nh->fib_nh_gw4,
|
||||
.flowi4_scope = scope + 1,
|
||||
.flowi4_oif = nh->fib_nh_oif,
|
||||
.flowi4_iif = LOOPBACK_IFINDEX,
|
||||
};
|
||||
|
||||
/* It is not necessary, but requires a bit of thinking */
|
||||
if (fl4.flowi4_scope < RT_SCOPE_LINK)
|
||||
fl4.flowi4_scope = RT_SCOPE_LINK;
|
||||
|
||||
if (table)
|
||||
tbl = fib_get_table(net, table);
|
||||
|
||||
if (tbl)
|
||||
err = fib_table_lookup(tbl, &fl4, &res,
|
||||
FIB_LOOKUP_IGNORE_LINKSTATE |
|
||||
FIB_LOOKUP_NOREF);
|
||||
|
||||
/* on error or if no table given do full lookup. This
|
||||
* is needed for example when nexthops are in the local
|
||||
* table rather than the given table
|
||||
*/
|
||||
if (!tbl || err) {
|
||||
err = fib_lookup(net, &fl4, &res,
|
||||
FIB_LOOKUP_IGNORE_LINKSTATE);
|
||||
}
|
||||
|
||||
if (err) {
|
||||
NL_SET_ERR_MSG(extack, "Nexthop has invalid gateway");
|
||||
goto out;
|
||||
}
|
||||
nh->fib_nh_scope = res.scope;
|
||||
nh->fib_nh_oif = FIB_RES_OIF(res);
|
||||
nh->fib_nh_dev = dev = FIB_RES_DEV(res);
|
||||
if (!dev) {
|
||||
NL_SET_ERR_MSG(extack,
|
||||
"No egress device for nexthop gateway");
|
||||
goto out;
|
||||
}
|
||||
dev_hold(dev);
|
||||
if (!netif_carrier_ok(dev))
|
||||
nh->fib_nh_flags |= RTNH_F_LINKDOWN;
|
||||
err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN;
|
||||
} else {
|
||||
struct in_device *in_dev;
|
||||
|
||||
if (nh->fib_nh_flags & (RTNH_F_PERVASIVE | RTNH_F_ONLINK)) {
|
||||
NL_SET_ERR_MSG(extack,
|
||||
"Invalid flags for nexthop - PERVASIVE and ONLINK can not be set");
|
||||
return -EINVAL;
|
||||
}
|
||||
rcu_read_lock();
|
||||
err = -ENODEV;
|
||||
in_dev = inetdev_by_index(net, nh->fib_nh_oif);
|
||||
if (!in_dev)
|
||||
goto out;
|
||||
err = -ENETDOWN;
|
||||
if (!(in_dev->dev->flags & IFF_UP)) {
|
||||
NL_SET_ERR_MSG(extack, "Device for nexthop is not up");
|
||||
goto out;
|
||||
}
|
||||
nh->fib_nh_dev = in_dev->dev;
|
||||
dev_hold(nh->fib_nh_dev);
|
||||
nh->fib_nh_scope = RT_SCOPE_HOST;
|
||||
if (!netif_carrier_ok(nh->fib_nh_dev))
|
||||
nh->fib_nh_flags |= RTNH_F_LINKDOWN;
|
||||
err = 0;
|
||||
}
|
||||
|
||||
err = -EINVAL;
|
||||
if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) {
|
||||
NL_SET_ERR_MSG(extack, "Nexthop has invalid gateway");
|
||||
goto out;
|
||||
}
|
||||
nh->fib_nh_scope = res.scope;
|
||||
nh->fib_nh_oif = FIB_RES_OIF(res);
|
||||
nh->fib_nh_dev = dev = FIB_RES_DEV(res);
|
||||
if (!dev) {
|
||||
NL_SET_ERR_MSG(extack,
|
||||
"No egress device for nexthop gateway");
|
||||
goto out;
|
||||
}
|
||||
dev_hold(dev);
|
||||
if (!netif_carrier_ok(dev))
|
||||
nh->fib_nh_flags |= RTNH_F_LINKDOWN;
|
||||
err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN;
|
||||
out:
|
||||
rcu_read_unlock();
|
||||
return err;
|
||||
}
|
||||
|
||||
static int fib_check_nh_nongw(struct net *net, struct fib_nh *nh,
|
||||
struct netlink_ext_ack *extack)
|
||||
{
|
||||
struct in_device *in_dev;
|
||||
int err;
|
||||
|
||||
if (nh->fib_nh_flags & (RTNH_F_PERVASIVE | RTNH_F_ONLINK)) {
|
||||
NL_SET_ERR_MSG(extack,
|
||||
"Invalid flags for nexthop - PERVASIVE and ONLINK can not be set");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
rcu_read_lock();
|
||||
|
||||
err = -ENODEV;
|
||||
in_dev = inetdev_by_index(net, nh->fib_nh_oif);
|
||||
if (!in_dev)
|
||||
goto out;
|
||||
err = -ENETDOWN;
|
||||
if (!(in_dev->dev->flags & IFF_UP)) {
|
||||
NL_SET_ERR_MSG(extack, "Device for nexthop is not up");
|
||||
goto out;
|
||||
}
|
||||
|
||||
nh->fib_nh_dev = in_dev->dev;
|
||||
dev_hold(nh->fib_nh_dev);
|
||||
nh->fib_nh_scope = RT_SCOPE_HOST;
|
||||
if (!netif_carrier_ok(nh->fib_nh_dev))
|
||||
nh->fib_nh_flags |= RTNH_F_LINKDOWN;
|
||||
err = 0;
|
||||
out:
|
||||
rcu_read_unlock();
|
||||
return err;
|
||||
}
|
||||
|
||||
static int fib_check_nh(struct fib_config *cfg, struct fib_nh *nh,
|
||||
struct netlink_ext_ack *extack)
|
||||
{
|
||||
struct net *net = cfg->fc_nlinfo.nl_net;
|
||||
u32 table = cfg->fc_table;
|
||||
int err;
|
||||
|
||||
if (nh->fib_nh_gw_family == AF_INET)
|
||||
err = fib_check_nh_v4_gw(net, nh, table, cfg->fc_scope, extack);
|
||||
else
|
||||
err = fib_check_nh_nongw(net, nh, extack);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static inline unsigned int fib_laddr_hashfn(__be32 val)
|
||||
{
|
||||
unsigned int mask = (fib_info_hash_size - 1);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user