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net/sched: sch_api: conditional netlink notifications

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Implement conditional netlink notifications for Qdiscs and classes,
which were missing in the initial patches that targeted tc filters and
actions. Notifications will only be built after passing a check for
'rtnl_notify_needed()'.

For both Qdiscs and classes 'get' operations now call a dedicated
notification function as it was not possible to distinguish between
'create' and 'get' before. This distinction is necessary because 'get'
always send a notification.

Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Link: https://lore.kernel.org/r/20231229132642.1489088-2-pctammela@mojatatu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Pedro Tammela 2023-12-29 10:26:42 -03:00 committed by Jakub Kicinski
parent c2a67de9bb
commit 530496985c
1 changed files with 68 additions and 11 deletions
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79
net/sched/sch_api.c
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@ -1003,6 +1003,32 @@ static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible)
return false;
}
static int qdisc_get_notify(struct net *net, struct sk_buff *oskb,
struct nlmsghdr *n, u32 clid, struct Qdisc *q,
struct netlink_ext_ack *extack)
{
struct sk_buff *skb;
u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return -ENOBUFS;
if (!tc_qdisc_dump_ignore(q, false)) {
if (tc_fill_qdisc(skb, q, clid, portid, n->nlmsg_seq, 0,
RTM_NEWQDISC, extack) < 0)
goto err_out;
}
if (skb->len)
return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
n->nlmsg_flags & NLM_F_ECHO);
err_out:
kfree_skb(skb);
return -EINVAL;
}
static int qdisc_notify(struct net *net, struct sk_buff *oskb,
struct nlmsghdr *n, u32 clid,
struct Qdisc *old, struct Qdisc *new,
@ -1011,6 +1037,9 @@ static int qdisc_notify(struct net *net, struct sk_buff *oskb,
struct sk_buff *skb;
u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC))
return 0;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return -ENOBUFS;
@ -1583,7 +1612,7 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
if (err != 0)
return err;
} else {
qdisc_notify(net, skb, n, clid, NULL, q, NULL);
qdisc_get_notify(net, skb, n, clid, q, NULL);
}
return 0;
}
@ -1977,6 +2006,9 @@ static int tclass_notify(struct net *net, struct sk_buff *oskb,
struct sk_buff *skb;
u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC))
return 0;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return -ENOBUFS;
@ -1990,6 +2022,27 @@ static int tclass_notify(struct net *net, struct sk_buff *oskb,
n->nlmsg_flags & NLM_F_ECHO);
}
static int tclass_get_notify(struct net *net, struct sk_buff *oskb,
struct nlmsghdr *n, struct Qdisc *q,
unsigned long cl, struct netlink_ext_ack *extack)
{
struct sk_buff *skb;
u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return -ENOBUFS;
if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, RTM_NEWTCLASS,
extack) < 0) {
kfree_skb(skb);
return -EINVAL;
}
return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
n->nlmsg_flags & NLM_F_ECHO);
}
static int tclass_del_notify(struct net *net,
const struct Qdisc_class_ops *cops,
struct sk_buff *oskb, struct nlmsghdr *n,
@ -2003,14 +2056,18 @@ static int tclass_del_notify(struct net *net,
if (!cops->delete)
return -EOPNOTSUPP;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return -ENOBUFS;
if (rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return -ENOBUFS;
if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0,
RTM_DELTCLASS, extack) < 0) {
kfree_skb(skb);
return -EINVAL;
if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0,
RTM_DELTCLASS, extack) < 0) {
kfree_skb(skb);
return -EINVAL;
}
} else {
skb = NULL;
}
err = cops->delete(q, cl, extack);
@ -2019,8 +2076,8 @@ static int tclass_del_notify(struct net *net,
return err;
}
err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
n->nlmsg_flags & NLM_F_ECHO);
err = rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
n->nlmsg_flags & NLM_F_ECHO);
return err;
}
@ -2215,7 +2272,7 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n,
tc_bind_tclass(q, portid, clid, 0);
goto out;
case RTM_GETTCLASS:
err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS, extack);
err = tclass_get_notify(net, skb, n, q, cl, extack);
goto out;
default:
err = -EINVAL;