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nexthop: Add netlink handlers for bucket get

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Allow getting (but not setting) individual buckets to inspect the next hop
mapped therein, idle time, and flags.

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 19:03:23 +01:00 committed by David S. Miller
parent 8a1bbabb03
commit 187d4c6b97
1 changed files with 109 additions and 1 deletions
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110
net/ipv4/nexthop.c
View file

@ -66,6 +66,15 @@ static const struct nla_policy rtm_nh_res_bucket_policy_dump[] = {
[NHA_RES_BUCKET_NH_ID] = { .type = NLA_U32 },
};
static const struct nla_policy rtm_nh_policy_get_bucket[] = {
[NHA_ID] = { .type = NLA_U32 },
[NHA_RES_BUCKET] = { .type = NLA_NESTED },
};
static const struct nla_policy rtm_nh_res_bucket_policy_get[] = {
[NHA_RES_BUCKET_INDEX] = { .type = NLA_U16 },
};
static bool nexthop_notifiers_is_empty(struct net *net)
{
return !net->nexthop.notifier_chain.head;
@ -3381,6 +3390,105 @@ static int rtm_dump_nexthop_bucket(struct sk_buff *skb,
return err;
}
static int nh_valid_get_bucket_req_res_bucket(struct nlattr *res,
u16 *bucket_index,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[ARRAY_SIZE(rtm_nh_res_bucket_policy_get)];
int err;
err = nla_parse_nested(tb, ARRAY_SIZE(rtm_nh_res_bucket_policy_get) - 1,
res, rtm_nh_res_bucket_policy_get, extack);
if (err < 0)
return err;
if (!tb[NHA_RES_BUCKET_INDEX]) {
NL_SET_ERR_MSG(extack, "Bucket index is missing");
return -EINVAL;
}
*bucket_index = nla_get_u16(tb[NHA_RES_BUCKET_INDEX]);
return 0;
}
static int nh_valid_get_bucket_req(const struct nlmsghdr *nlh,
u32 *id, u16 *bucket_index,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[ARRAY_SIZE(rtm_nh_policy_get_bucket)];
int err;
err = nlmsg_parse(nlh, sizeof(struct nhmsg), tb,
ARRAY_SIZE(rtm_nh_policy_get_bucket) - 1,
rtm_nh_policy_get_bucket, extack);
if (err < 0)
return err;
err = __nh_valid_get_del_req(nlh, tb, id, extack);
if (err)
return err;
if (!tb[NHA_RES_BUCKET]) {
NL_SET_ERR_MSG(extack, "Bucket information is missing");
return -EINVAL;
}
err = nh_valid_get_bucket_req_res_bucket(tb[NHA_RES_BUCKET],
bucket_index, extack);
if (err)
return err;
return 0;
}
/* rtnl */
static int rtm_get_nexthop_bucket(struct sk_buff *in_skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(in_skb->sk);
struct nh_res_table *res_table;
struct sk_buff *skb = NULL;
struct nh_group *nhg;
struct nexthop *nh;
u16 bucket_index;
int err;
u32 id;
err = nh_valid_get_bucket_req(nlh, &id, &bucket_index, extack);
if (err)
return err;
nh = nexthop_find_group_resilient(net, id, extack);
if (IS_ERR(nh))
return PTR_ERR(nh);
nhg = rtnl_dereference(nh->nh_grp);
res_table = rtnl_dereference(nhg->res_table);
if (bucket_index >= res_table->num_nh_buckets) {
NL_SET_ERR_MSG(extack, "Bucket index out of bounds");
return -ENOENT;
}
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return -ENOBUFS;
err = nh_fill_res_bucket(skb, nh, &res_table->nh_buckets[bucket_index],
bucket_index, RTM_NEWNEXTHOPBUCKET,
NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
0, extack);
if (err < 0) {
WARN_ON(err == -EMSGSIZE);
goto errout_free;
}
return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
errout_free:
kfree_skb(skb);
return err;
}
static void nexthop_sync_mtu(struct net_device *dev, u32 orig_mtu)
{
unsigned int hash = nh_dev_hashfn(dev->ifindex);
@ -3604,7 +3712,7 @@ static int __init nexthop_init(void)
rtnl_register(PF_INET6, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0);
rtnl_register(PF_INET6, RTM_GETNEXTHOP, NULL, rtm_dump_nexthop, 0);
rtnl_register(PF_UNSPEC, RTM_GETNEXTHOPBUCKET, NULL,
rtnl_register(PF_UNSPEC, RTM_GETNEXTHOPBUCKET, rtm_get_nexthop_bucket,
rtm_dump_nexthop_bucket, 0);
return 0;