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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /net/sched/act_sample.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/sched/act_sample.c')
-rw-r--r--net/sched/act_sample.c354
1 files changed, 354 insertions, 0 deletions
diff --git a/net/sched/act_sample.c b/net/sched/act_sample.c
new file mode 100644
index 0000000000..4c670e7568
--- /dev/null
+++ b/net/sched/act_sample.c
@@ -0,0 +1,354 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * net/sched/act_sample.c - Packet sampling tc action
+ * Copyright (c) 2017 Yotam Gigi <yotamg@mellanox.com>
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/gfp.h>
+#include <net/net_namespace.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <linux/tc_act/tc_sample.h>
+#include <net/tc_act/tc_sample.h>
+#include <net/psample.h>
+#include <net/pkt_cls.h>
+#include <net/tc_wrapper.h>
+
+#include <linux/if_arp.h>
+
+static struct tc_action_ops act_sample_ops;
+
+static const struct nla_policy sample_policy[TCA_SAMPLE_MAX + 1] = {
+ [TCA_SAMPLE_PARMS] = { .len = sizeof(struct tc_sample) },
+ [TCA_SAMPLE_RATE] = { .type = NLA_U32 },
+ [TCA_SAMPLE_TRUNC_SIZE] = { .type = NLA_U32 },
+ [TCA_SAMPLE_PSAMPLE_GROUP] = { .type = NLA_U32 },
+};
+
+static int tcf_sample_init(struct net *net, struct nlattr *nla,
+ struct nlattr *est, struct tc_action **a,
+ struct tcf_proto *tp,
+ u32 flags, struct netlink_ext_ack *extack)
+{
+ struct tc_action_net *tn = net_generic(net, act_sample_ops.net_id);
+ bool bind = flags & TCA_ACT_FLAGS_BIND;
+ struct nlattr *tb[TCA_SAMPLE_MAX + 1];
+ struct psample_group *psample_group;
+ u32 psample_group_num, rate, index;
+ struct tcf_chain *goto_ch = NULL;
+ struct tc_sample *parm;
+ struct tcf_sample *s;
+ bool exists = false;
+ int ret, err;
+
+ if (!nla)
+ return -EINVAL;
+ ret = nla_parse_nested_deprecated(tb, TCA_SAMPLE_MAX, nla,
+ sample_policy, NULL);
+ if (ret < 0)
+ return ret;
+
+ if (!tb[TCA_SAMPLE_PARMS])
+ return -EINVAL;
+
+ parm = nla_data(tb[TCA_SAMPLE_PARMS]);
+ index = parm->index;
+ err = tcf_idr_check_alloc(tn, &index, a, bind);
+ if (err < 0)
+ return err;
+ exists = err;
+ if (exists && bind)
+ return 0;
+
+ if (!exists) {
+ ret = tcf_idr_create(tn, index, est, a,
+ &act_sample_ops, bind, true, flags);
+ if (ret) {
+ tcf_idr_cleanup(tn, index);
+ return ret;
+ }
+ ret = ACT_P_CREATED;
+ } else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
+ tcf_idr_release(*a, bind);
+ return -EEXIST;
+ }
+
+ if (!tb[TCA_SAMPLE_RATE] || !tb[TCA_SAMPLE_PSAMPLE_GROUP]) {
+ NL_SET_ERR_MSG(extack, "sample rate and group are required");
+ err = -EINVAL;
+ goto release_idr;
+ }
+
+ err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
+ if (err < 0)
+ goto release_idr;
+
+ rate = nla_get_u32(tb[TCA_SAMPLE_RATE]);
+ if (!rate) {
+ NL_SET_ERR_MSG(extack, "invalid sample rate");
+ err = -EINVAL;
+ goto put_chain;
+ }
+ psample_group_num = nla_get_u32(tb[TCA_SAMPLE_PSAMPLE_GROUP]);
+ psample_group = psample_group_get(net, psample_group_num);
+ if (!psample_group) {
+ err = -ENOMEM;
+ goto put_chain;
+ }
+
+ s = to_sample(*a);
+
+ spin_lock_bh(&s->tcf_lock);
+ goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
+ s->rate = rate;
+ s->psample_group_num = psample_group_num;
+ psample_group = rcu_replace_pointer(s->psample_group, psample_group,
+ lockdep_is_held(&s->tcf_lock));
+
+ if (tb[TCA_SAMPLE_TRUNC_SIZE]) {
+ s->truncate = true;
+ s->trunc_size = nla_get_u32(tb[TCA_SAMPLE_TRUNC_SIZE]);
+ }
+ spin_unlock_bh(&s->tcf_lock);
+
+ if (psample_group)
+ psample_group_put(psample_group);
+ if (goto_ch)
+ tcf_chain_put_by_act(goto_ch);
+
+ return ret;
+put_chain:
+ if (goto_ch)
+ tcf_chain_put_by_act(goto_ch);
+release_idr:
+ tcf_idr_release(*a, bind);
+ return err;
+}
+
+static void tcf_sample_cleanup(struct tc_action *a)
+{
+ struct tcf_sample *s = to_sample(a);
+ struct psample_group *psample_group;
+
+ /* last reference to action, no need to lock */
+ psample_group = rcu_dereference_protected(s->psample_group, 1);
+ RCU_INIT_POINTER(s->psample_group, NULL);
+ if (psample_group)
+ psample_group_put(psample_group);
+}
+
+static bool tcf_sample_dev_ok_push(struct net_device *dev)
+{
+ switch (dev->type) {
+ case ARPHRD_TUNNEL:
+ case ARPHRD_TUNNEL6:
+ case ARPHRD_SIT:
+ case ARPHRD_IPGRE:
+ case ARPHRD_IP6GRE:
+ case ARPHRD_VOID:
+ case ARPHRD_NONE:
+ return false;
+ default:
+ return true;
+ }
+}
+
+TC_INDIRECT_SCOPE int tcf_sample_act(struct sk_buff *skb,
+ const struct tc_action *a,
+ struct tcf_result *res)
+{
+ struct tcf_sample *s = to_sample(a);
+ struct psample_group *psample_group;
+ struct psample_metadata md = {};
+ int retval;
+
+ tcf_lastuse_update(&s->tcf_tm);
+ bstats_update(this_cpu_ptr(s->common.cpu_bstats), skb);
+ retval = READ_ONCE(s->tcf_action);
+
+ psample_group = rcu_dereference_bh(s->psample_group);
+
+ /* randomly sample packets according to rate */
+ if (psample_group && (get_random_u32_below(s->rate) == 0)) {
+ if (!skb_at_tc_ingress(skb)) {
+ md.in_ifindex = skb->skb_iif;
+ md.out_ifindex = skb->dev->ifindex;
+ } else {
+ md.in_ifindex = skb->dev->ifindex;
+ }
+
+ /* on ingress, the mac header gets popped, so push it back */
+ if (skb_at_tc_ingress(skb) && tcf_sample_dev_ok_push(skb->dev))
+ skb_push(skb, skb->mac_len);
+
+ md.trunc_size = s->truncate ? s->trunc_size : skb->len;
+ psample_sample_packet(psample_group, skb, s->rate, &md);
+
+ if (skb_at_tc_ingress(skb) && tcf_sample_dev_ok_push(skb->dev))
+ skb_pull(skb, skb->mac_len);
+ }
+
+ return retval;
+}
+
+static void tcf_sample_stats_update(struct tc_action *a, u64 bytes, u64 packets,
+ u64 drops, u64 lastuse, bool hw)
+{
+ struct tcf_sample *s = to_sample(a);
+ struct tcf_t *tm = &s->tcf_tm;
+
+ tcf_action_update_stats(a, bytes, packets, drops, hw);
+ tm->lastuse = max_t(u64, tm->lastuse, lastuse);
+}
+
+static int tcf_sample_dump(struct sk_buff *skb, struct tc_action *a,
+ int bind, int ref)
+{
+ unsigned char *b = skb_tail_pointer(skb);
+ struct tcf_sample *s = to_sample(a);
+ struct tc_sample opt = {
+ .index = s->tcf_index,
+ .refcnt = refcount_read(&s->tcf_refcnt) - ref,
+ .bindcnt = atomic_read(&s->tcf_bindcnt) - bind,
+ };
+ struct tcf_t t;
+
+ spin_lock_bh(&s->tcf_lock);
+ opt.action = s->tcf_action;
+ if (nla_put(skb, TCA_SAMPLE_PARMS, sizeof(opt), &opt))
+ goto nla_put_failure;
+
+ tcf_tm_dump(&t, &s->tcf_tm);
+ if (nla_put_64bit(skb, TCA_SAMPLE_TM, sizeof(t), &t, TCA_SAMPLE_PAD))
+ goto nla_put_failure;
+
+ if (nla_put_u32(skb, TCA_SAMPLE_RATE, s->rate))
+ goto nla_put_failure;
+
+ if (s->truncate)
+ if (nla_put_u32(skb, TCA_SAMPLE_TRUNC_SIZE, s->trunc_size))
+ goto nla_put_failure;
+
+ if (nla_put_u32(skb, TCA_SAMPLE_PSAMPLE_GROUP, s->psample_group_num))
+ goto nla_put_failure;
+ spin_unlock_bh(&s->tcf_lock);
+
+ return skb->len;
+
+nla_put_failure:
+ spin_unlock_bh(&s->tcf_lock);
+ nlmsg_trim(skb, b);
+ return -1;
+}
+
+static void tcf_psample_group_put(void *priv)
+{
+ struct psample_group *group = priv;
+
+ psample_group_put(group);
+}
+
+static struct psample_group *
+tcf_sample_get_group(const struct tc_action *a,
+ tc_action_priv_destructor *destructor)
+{
+ struct tcf_sample *s = to_sample(a);
+ struct psample_group *group;
+
+ group = rcu_dereference_protected(s->psample_group,
+ lockdep_is_held(&s->tcf_lock));
+ if (group) {
+ psample_group_take(group);
+ *destructor = tcf_psample_group_put;
+ }
+
+ return group;
+}
+
+static void tcf_offload_sample_get_group(struct flow_action_entry *entry,
+ const struct tc_action *act)
+{
+ entry->sample.psample_group =
+ act->ops->get_psample_group(act, &entry->destructor);
+ entry->destructor_priv = entry->sample.psample_group;
+}
+
+static int tcf_sample_offload_act_setup(struct tc_action *act, void *entry_data,
+ u32 *index_inc, bool bind,
+ struct netlink_ext_ack *extack)
+{
+ if (bind) {
+ struct flow_action_entry *entry = entry_data;
+
+ entry->id = FLOW_ACTION_SAMPLE;
+ entry->sample.trunc_size = tcf_sample_trunc_size(act);
+ entry->sample.truncate = tcf_sample_truncate(act);
+ entry->sample.rate = tcf_sample_rate(act);
+ tcf_offload_sample_get_group(entry, act);
+ *index_inc = 1;
+ } else {
+ struct flow_offload_action *fl_action = entry_data;
+
+ fl_action->id = FLOW_ACTION_SAMPLE;
+ }
+
+ return 0;
+}
+
+static struct tc_action_ops act_sample_ops = {
+ .kind = "sample",
+ .id = TCA_ID_SAMPLE,
+ .owner = THIS_MODULE,
+ .act = tcf_sample_act,
+ .stats_update = tcf_sample_stats_update,
+ .dump = tcf_sample_dump,
+ .init = tcf_sample_init,
+ .cleanup = tcf_sample_cleanup,
+ .get_psample_group = tcf_sample_get_group,
+ .offload_act_setup = tcf_sample_offload_act_setup,
+ .size = sizeof(struct tcf_sample),
+};
+
+static __net_init int sample_init_net(struct net *net)
+{
+ struct tc_action_net *tn = net_generic(net, act_sample_ops.net_id);
+
+ return tc_action_net_init(net, tn, &act_sample_ops);
+}
+
+static void __net_exit sample_exit_net(struct list_head *net_list)
+{
+ tc_action_net_exit(net_list, act_sample_ops.net_id);
+}
+
+static struct pernet_operations sample_net_ops = {
+ .init = sample_init_net,
+ .exit_batch = sample_exit_net,
+ .id = &act_sample_ops.net_id,
+ .size = sizeof(struct tc_action_net),
+};
+
+static int __init sample_init_module(void)
+{
+ return tcf_register_action(&act_sample_ops, &sample_net_ops);
+}
+
+static void __exit sample_cleanup_module(void)
+{
+ tcf_unregister_action(&act_sample_ops, &sample_net_ops);
+}
+
+module_init(sample_init_module);
+module_exit(sample_cleanup_module);
+
+MODULE_AUTHOR("Yotam Gigi <yotam.gi@gmail.com>");
+MODULE_DESCRIPTION("Packet sampling action");
+MODULE_LICENSE("GPL v2");