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nexthop: Add netlink handlers for resilient nexthop groups

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Implement the netlink messages that allow creation and dumping of resilient
nexthop groups.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata 2021-03-11 19:03:21 +01:00 • committed by David S. Miller
parent cfc15c1dbb
commit a2601e2b1e
1 changed files with 145 additions and 5 deletions
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150
net/ipv4/nexthop.c
View file

@ -16,6 +16,9 @@
#include <net/route.h>
#include <net/sock.h>
#define NH_RES_DEFAULT_IDLE_TIMER (120 * HZ)
#define NH_RES_DEFAULT_UNBALANCED_TIMER 0 /* No forced rebalancing. */
static void remove_nexthop(struct net *net, struct nexthop *nh,
struct nl_info *nlinfo);
@ -32,6 +35,7 @@ static const struct nla_policy rtm_nh_policy_new[] = {
[NHA_ENCAP_TYPE] = { .type = NLA_U16 },
[NHA_ENCAP] = { .type = NLA_NESTED },
[NHA_FDB] = { .type = NLA_FLAG },
[NHA_RES_GROUP] = { .type = NLA_NESTED },
};
static const struct nla_policy rtm_nh_policy_get[] = {
@ -45,6 +49,12 @@ static const struct nla_policy rtm_nh_policy_dump[] = {
[NHA_FDB] = { .type = NLA_FLAG },
};
static const struct nla_policy rtm_nh_res_policy_new[] = {
[NHA_RES_GROUP_BUCKETS] = { .type = NLA_U16 },
[NHA_RES_GROUP_IDLE_TIMER] = { .type = NLA_U32 },
[NHA_RES_GROUP_UNBALANCED_TIMER] = { .type = NLA_U32 },
};
static bool nexthop_notifiers_is_empty(struct net *net)
{
return !net->nexthop.notifier_chain.head;
@ -588,6 +598,41 @@ static void nh_res_time_set_deadline(unsigned long next_time,
*deadline = next_time;
}
static clock_t nh_res_table_unbalanced_time(struct nh_res_table *res_table)
{
if (list_empty(&res_table->uw_nh_entries))
return 0;
return jiffies_delta_to_clock_t(jiffies - res_table->unbalanced_since);
}
static int nla_put_nh_group_res(struct sk_buff *skb, struct nh_group *nhg)
{
struct nh_res_table *res_table = rtnl_dereference(nhg->res_table);
struct nlattr *nest;
nest = nla_nest_start(skb, NHA_RES_GROUP);
if (!nest)
return -EMSGSIZE;
if (nla_put_u16(skb, NHA_RES_GROUP_BUCKETS,
res_table->num_nh_buckets) ||
nla_put_u32(skb, NHA_RES_GROUP_IDLE_TIMER,
jiffies_to_clock_t(res_table->idle_timer)) ||
nla_put_u32(skb, NHA_RES_GROUP_UNBALANCED_TIMER,
jiffies_to_clock_t(res_table->unbalanced_timer)) ||
nla_put_u64_64bit(skb, NHA_RES_GROUP_UNBALANCED_TIME,
nh_res_table_unbalanced_time(res_table),
NHA_RES_GROUP_PAD))
goto nla_put_failure;
nla_nest_end(skb, nest);
return 0;
nla_put_failure:
nla_nest_cancel(skb, nest);
return -EMSGSIZE;
}
static int nla_put_nh_group(struct sk_buff *skb, struct nh_group *nhg)
{
struct nexthop_grp *p;
@ -598,6 +643,8 @@ static int nla_put_nh_group(struct sk_buff *skb, struct nh_group *nhg)
if (nhg->mpath)
group_type = NEXTHOP_GRP_TYPE_MPATH;
else if (nhg->resilient)
group_type = NEXTHOP_GRP_TYPE_RES;
if (nla_put_u16(skb, NHA_GROUP_TYPE, group_type))
goto nla_put_failure;
@ -613,6 +660,9 @@ static int nla_put_nh_group(struct sk_buff *skb, struct nh_group *nhg)
p += 1;
}
if (nhg->resilient && nla_put_nh_group_res(skb, nhg))
goto nla_put_failure;
return 0;
nla_put_failure:
@ -700,13 +750,26 @@ nla_put_failure:
return -EMSGSIZE;
}
static size_t nh_nlmsg_size_grp_res(struct nh_group *nhg)
{
return nla_total_size(0) + /* NHA_RES_GROUP */
nla_total_size(2) + /* NHA_RES_GROUP_BUCKETS */
nla_total_size(4) + /* NHA_RES_GROUP_IDLE_TIMER */
nla_total_size(4) + /* NHA_RES_GROUP_UNBALANCED_TIMER */
nla_total_size_64bit(8);/* NHA_RES_GROUP_UNBALANCED_TIME */
}
static size_t nh_nlmsg_size_grp(struct nexthop *nh)
{
struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
size_t sz = sizeof(struct nexthop_grp) * nhg->num_nh;
return nla_total_size(sz) +
size_t tot = nla_total_size(sz) +
nla_total_size(2); /* NHA_GROUP_TYPE */
if (nhg->resilient)
tot += nh_nlmsg_size_grp_res(nhg);
return tot;
}
static size_t nh_nlmsg_size_single(struct nexthop *nh)
@ -876,7 +939,7 @@ static int nh_check_attr_fdb_group(struct nexthop *nh, u8 *nh_family,
static int nh_check_attr_group(struct net *net,
struct nlattr *tb[], size_t tb_size,
struct netlink_ext_ack *extack)
u16 nh_grp_type, struct netlink_ext_ack *extack)
{
unsigned int len = nla_len(tb[NHA_GROUP]);
u8 nh_family = AF_UNSPEC;
@ -937,8 +1000,14 @@ static int nh_check_attr_group(struct net *net,
for (i = NHA_GROUP_TYPE + 1; i < tb_size; ++i) {
if (!tb[i])
continue;
if (i == NHA_FDB)
switch (i) {
case NHA_FDB:
continue;
case NHA_RES_GROUP:
if (nh_grp_type == NEXTHOP_GRP_TYPE_RES)
continue;
break;
}
NL_SET_ERR_MSG(extack,
"No other attributes can be set in nexthop groups");
return -EINVAL;
@ -2475,6 +2544,70 @@ static struct nexthop *nexthop_add(struct net *net, struct nh_config *cfg,
return nh;
}
static int rtm_nh_get_timer(struct nlattr *attr, unsigned long fallback,
unsigned long *timer_p, bool *has_p,
struct netlink_ext_ack *extack)
{
unsigned long timer;
u32 value;
if (!attr) {
*timer_p = fallback;
*has_p = false;
return 0;
}
value = nla_get_u32(attr);
timer = clock_t_to_jiffies(value);
if (timer == ~0UL) {
NL_SET_ERR_MSG(extack, "Timer value too large");
return -EINVAL;
}
*timer_p = timer;
*has_p = true;
return 0;
}
static int rtm_to_nh_config_grp_res(struct nlattr *res, struct nh_config *cfg,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[ARRAY_SIZE(rtm_nh_res_policy_new)] = {};
int err;
if (res) {
err = nla_parse_nested(tb,
ARRAY_SIZE(rtm_nh_res_policy_new) - 1,
res, rtm_nh_res_policy_new, extack);
if (err < 0)
return err;
}
if (tb[NHA_RES_GROUP_BUCKETS]) {
cfg->nh_grp_res_num_buckets =
nla_get_u16(tb[NHA_RES_GROUP_BUCKETS]);
cfg->nh_grp_res_has_num_buckets = true;
if (!cfg->nh_grp_res_num_buckets) {
NL_SET_ERR_MSG(extack, "Number of buckets needs to be non-0");
return -EINVAL;
}
}
err = rtm_nh_get_timer(tb[NHA_RES_GROUP_IDLE_TIMER],
NH_RES_DEFAULT_IDLE_TIMER,
&cfg->nh_grp_res_idle_timer,
&cfg->nh_grp_res_has_idle_timer,
extack);
if (err)
return err;
return rtm_nh_get_timer(tb[NHA_RES_GROUP_UNBALANCED_TIMER],
NH_RES_DEFAULT_UNBALANCED_TIMER,
&cfg->nh_grp_res_unbalanced_timer,
&cfg->nh_grp_res_has_unbalanced_timer,
extack);
}
static int rtm_to_nh_config(struct net *net, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nh_config *cfg,
struct netlink_ext_ack *extack)
@ -2553,7 +2686,14 @@ static int rtm_to_nh_config(struct net *net, struct sk_buff *skb,
NL_SET_ERR_MSG(extack, "Invalid group type");
goto out;
}
err = nh_check_attr_group(net, tb, ARRAY_SIZE(tb), extack);
err = nh_check_attr_group(net, tb, ARRAY_SIZE(tb),
cfg->nh_grp_type, extack);
if (err)
goto out;
if (cfg->nh_grp_type == NEXTHOP_GRP_TYPE_RES)
err = rtm_to_nh_config_grp_res(tb[NHA_RES_GROUP],
cfg, extack);
/* no other attributes should be set */
goto out;