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net: rtnetlink: Add RTM_SETSTATS 

The offloaded HW stats are designed to allow per-netdevice enablement and
disablement. These stats are only accessible through RTM_GETSTATS, and
therefore should be toggled by a RTM_SETSTATS message. Add it, and the
necessary skeleton handler.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata 2022-03-02 18:31:22 +02:00 committed by David S. Miller
parent 0e7788fd76
commit 03ba356670
3 changed files with 69 additions and 0 deletions
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2
include/uapi/linux/rtnetlink.h
View File

@ -146,6 +146,8 @@ enum {
#define RTM_NEWSTATS RTM_NEWSTATS
RTM_GETSTATS = 94,
#define RTM_GETSTATS RTM_GETSTATS
RTM_SETSTATS,
#define RTM_SETSTATS RTM_SETSTATS
RTM_NEWCACHEREPORT = 96,
#define RTM_NEWCACHEREPORT RTM_NEWCACHEREPORT

66
net/core/rtnetlink.c
View File

@ -5564,6 +5564,10 @@ rtnl_stats_get_policy[IFLA_STATS_GETSET_MAX + 1] = {
NLA_POLICY_NESTED(rtnl_stats_get_policy_filters),
};
static const struct nla_policy
ifla_stats_set_policy[IFLA_STATS_GETSET_MAX + 1] = {
};
static int rtnl_stats_get_parse_filters(struct nlattr *ifla_filters,
struct rtnl_stats_dump_filters *filters,
struct netlink_ext_ack *extack)
@ -5769,6 +5773,67 @@ out:
return skb->len;
}
static int rtnl_stats_set(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct rtnl_stats_dump_filters response_filters = {};
struct nlattr *tb[IFLA_STATS_GETSET_MAX + 1];
struct net *net = sock_net(skb->sk);
struct net_device *dev = NULL;
int idxattr = 0, prividx = 0;
struct if_stats_msg *ifsm;
struct sk_buff *nskb;
int err;
err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
false, extack);
if (err)
return err;
ifsm = nlmsg_data(nlh);
if (ifsm->family != AF_UNSPEC) {
NL_SET_ERR_MSG(extack, "Address family should be AF_UNSPEC");
return -EINVAL;
}
if (ifsm->ifindex > 0)
dev = __dev_get_by_index(net, ifsm->ifindex);
else
return -EINVAL;
if (!dev)
return -ENODEV;
if (ifsm->filter_mask) {
NL_SET_ERR_MSG(extack, "Filter mask must be 0 for stats set");
return -EINVAL;
}
err = nlmsg_parse(nlh, sizeof(*ifsm), tb, IFLA_STATS_GETSET_MAX,
ifla_stats_set_policy, extack);
if (err < 0)
return err;
nskb = nlmsg_new(if_nlmsg_stats_size(dev, &response_filters),
GFP_KERNEL);
if (!nskb)
return -ENOBUFS;
err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
0, &response_filters, &idxattr, &prividx,
extack);
if (err < 0) {
/* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
WARN_ON(err == -EMSGSIZE);
kfree_skb(nskb);
} else {
err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
}
return err;
}
/* Process one rtnetlink message. */
static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
@ -5994,4 +6059,5 @@ void __init rtnetlink_init(void)
rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
0);
rtnl_register(PF_UNSPEC, RTM_SETSTATS, rtnl_stats_set, NULL, 0);
}

1
security/selinux/nlmsgtab.c
View File

@ -76,6 +76,7 @@ static const struct nlmsg_perm nlmsg_route_perms[] =
{ RTM_GETNSID, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWSTATS, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_GETSTATS, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_SETSTATS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_NEWCACHEREPORT, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWCHAIN, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELCHAIN, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },