2017-01-23 10:07:09 +00:00
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/*
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* net/sched/act_sample.c - Packet sampling tc action
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* Copyright (c) 2017 Yotam Gigi <yotamg@mellanox.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/gfp.h>
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#include <net/net_namespace.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <linux/tc_act/tc_sample.h>
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#include <net/tc_act/tc_sample.h>
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#include <net/psample.h>
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#include <linux/if_arp.h>
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static unsigned int sample_net_id;
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static struct tc_action_ops act_sample_ops;
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static const struct nla_policy sample_policy[TCA_SAMPLE_MAX + 1] = {
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[TCA_SAMPLE_PARMS] = { .len = sizeof(struct tc_sample) },
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[TCA_SAMPLE_RATE] = { .type = NLA_U32 },
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[TCA_SAMPLE_TRUNC_SIZE] = { .type = NLA_U32 },
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[TCA_SAMPLE_PSAMPLE_GROUP] = { .type = NLA_U32 },
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};
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static int tcf_sample_init(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action **a, int ovr,
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int bind)
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{
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struct tc_action_net *tn = net_generic(net, sample_net_id);
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struct nlattr *tb[TCA_SAMPLE_MAX + 1];
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struct psample_group *psample_group;
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struct tc_sample *parm;
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struct tcf_sample *s;
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bool exists = false;
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int ret;
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if (!nla)
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return -EINVAL;
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2017-04-12 12:34:07 +00:00
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ret = nla_parse_nested(tb, TCA_SAMPLE_MAX, nla, sample_policy, NULL);
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2017-01-23 10:07:09 +00:00
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if (ret < 0)
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return ret;
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if (!tb[TCA_SAMPLE_PARMS] || !tb[TCA_SAMPLE_RATE] ||
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!tb[TCA_SAMPLE_PSAMPLE_GROUP])
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return -EINVAL;
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parm = nla_data(tb[TCA_SAMPLE_PARMS]);
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2017-08-30 06:31:59 +00:00
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exists = tcf_idr_check(tn, parm->index, a, bind);
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2017-01-23 10:07:09 +00:00
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if (exists && bind)
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return 0;
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if (!exists) {
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2017-08-30 06:31:59 +00:00
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ret = tcf_idr_create(tn, parm->index, est, a,
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&act_sample_ops, bind, false);
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2017-01-23 10:07:09 +00:00
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if (ret)
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return ret;
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ret = ACT_P_CREATED;
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} else {
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2017-08-30 06:31:59 +00:00
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tcf_idr_release(*a, bind);
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2017-01-23 10:07:09 +00:00
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if (!ovr)
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return -EEXIST;
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}
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s = to_sample(*a);
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s->tcf_action = parm->action;
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s->rate = nla_get_u32(tb[TCA_SAMPLE_RATE]);
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s->psample_group_num = nla_get_u32(tb[TCA_SAMPLE_PSAMPLE_GROUP]);
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psample_group = psample_group_get(net, s->psample_group_num);
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2017-01-31 09:33:53 +00:00
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if (!psample_group) {
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if (ret == ACT_P_CREATED)
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2017-08-30 06:31:59 +00:00
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tcf_idr_release(*a, bind);
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2017-01-23 10:07:09 +00:00
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return -ENOMEM;
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2017-01-31 09:33:53 +00:00
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}
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2017-01-23 10:07:09 +00:00
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RCU_INIT_POINTER(s->psample_group, psample_group);
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if (tb[TCA_SAMPLE_TRUNC_SIZE]) {
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s->truncate = true;
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s->trunc_size = nla_get_u32(tb[TCA_SAMPLE_TRUNC_SIZE]);
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}
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if (ret == ACT_P_CREATED)
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2017-08-30 06:31:59 +00:00
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tcf_idr_insert(tn, *a);
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2017-01-23 10:07:09 +00:00
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return ret;
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}
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2017-11-30 00:07:51 +00:00
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static void tcf_sample_cleanup(struct tc_action *a, int bind)
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2017-01-23 10:07:09 +00:00
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{
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2017-11-30 00:07:51 +00:00
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struct tcf_sample *s = to_sample(a);
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2017-01-23 10:07:09 +00:00
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struct psample_group *psample_group;
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2017-11-30 00:07:51 +00:00
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psample_group = rtnl_dereference(s->psample_group);
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2017-01-23 10:07:09 +00:00
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RCU_INIT_POINTER(s->psample_group, NULL);
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psample_group_put(psample_group);
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}
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static bool tcf_sample_dev_ok_push(struct net_device *dev)
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{
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switch (dev->type) {
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case ARPHRD_TUNNEL:
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case ARPHRD_TUNNEL6:
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case ARPHRD_SIT:
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case ARPHRD_IPGRE:
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case ARPHRD_VOID:
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case ARPHRD_NONE:
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return false;
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default:
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return true;
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}
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}
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static int tcf_sample_act(struct sk_buff *skb, const struct tc_action *a,
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struct tcf_result *res)
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{
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struct tcf_sample *s = to_sample(a);
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struct psample_group *psample_group;
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int retval;
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int size;
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int iif;
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int oif;
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tcf_lastuse_update(&s->tcf_tm);
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bstats_cpu_update(this_cpu_ptr(s->common.cpu_bstats), skb);
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retval = READ_ONCE(s->tcf_action);
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rcu_read_lock();
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psample_group = rcu_dereference(s->psample_group);
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/* randomly sample packets according to rate */
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if (psample_group && (prandom_u32() % s->rate == 0)) {
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if (!skb_at_tc_ingress(skb)) {
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iif = skb->skb_iif;
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oif = skb->dev->ifindex;
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} else {
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iif = skb->dev->ifindex;
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oif = 0;
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}
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/* on ingress, the mac header gets popped, so push it back */
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if (skb_at_tc_ingress(skb) && tcf_sample_dev_ok_push(skb->dev))
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skb_push(skb, skb->mac_len);
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size = s->truncate ? s->trunc_size : skb->len;
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psample_sample_packet(psample_group, skb, size, iif, oif,
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s->rate);
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if (skb_at_tc_ingress(skb) && tcf_sample_dev_ok_push(skb->dev))
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skb_pull(skb, skb->mac_len);
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}
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rcu_read_unlock();
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return retval;
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}
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static int tcf_sample_dump(struct sk_buff *skb, struct tc_action *a,
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int bind, int ref)
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{
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unsigned char *b = skb_tail_pointer(skb);
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struct tcf_sample *s = to_sample(a);
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struct tc_sample opt = {
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.index = s->tcf_index,
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.action = s->tcf_action,
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.refcnt = s->tcf_refcnt - ref,
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.bindcnt = s->tcf_bindcnt - bind,
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};
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struct tcf_t t;
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if (nla_put(skb, TCA_SAMPLE_PARMS, sizeof(opt), &opt))
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goto nla_put_failure;
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tcf_tm_dump(&t, &s->tcf_tm);
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if (nla_put_64bit(skb, TCA_SAMPLE_TM, sizeof(t), &t, TCA_SAMPLE_PAD))
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goto nla_put_failure;
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if (nla_put_u32(skb, TCA_SAMPLE_RATE, s->rate))
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goto nla_put_failure;
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if (s->truncate)
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if (nla_put_u32(skb, TCA_SAMPLE_TRUNC_SIZE, s->trunc_size))
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goto nla_put_failure;
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if (nla_put_u32(skb, TCA_SAMPLE_PSAMPLE_GROUP, s->psample_group_num))
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goto nla_put_failure;
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return skb->len;
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nla_put_failure:
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nlmsg_trim(skb, b);
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return -1;
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}
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static int tcf_sample_walker(struct net *net, struct sk_buff *skb,
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struct netlink_callback *cb, int type,
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const struct tc_action_ops *ops)
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{
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struct tc_action_net *tn = net_generic(net, sample_net_id);
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return tcf_generic_walker(tn, skb, cb, type, ops);
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}
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static int tcf_sample_search(struct net *net, struct tc_action **a, u32 index)
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{
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struct tc_action_net *tn = net_generic(net, sample_net_id);
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2017-08-30 06:31:59 +00:00
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return tcf_idr_search(tn, a, index);
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2017-01-23 10:07:09 +00:00
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}
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static struct tc_action_ops act_sample_ops = {
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.kind = "sample",
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.type = TCA_ACT_SAMPLE,
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.owner = THIS_MODULE,
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.act = tcf_sample_act,
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.dump = tcf_sample_dump,
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.init = tcf_sample_init,
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.cleanup = tcf_sample_cleanup,
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.walk = tcf_sample_walker,
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.lookup = tcf_sample_search,
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.size = sizeof(struct tcf_sample),
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};
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static __net_init int sample_init_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, sample_net_id);
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2017-11-06 21:47:18 +00:00
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return tc_action_net_init(tn, &act_sample_ops);
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2017-01-23 10:07:09 +00:00
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}
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static void __net_exit sample_exit_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, sample_net_id);
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tc_action_net_exit(tn);
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}
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static struct pernet_operations sample_net_ops = {
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.init = sample_init_net,
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.exit = sample_exit_net,
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.id = &sample_net_id,
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.size = sizeof(struct tc_action_net),
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};
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static int __init sample_init_module(void)
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{
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return tcf_register_action(&act_sample_ops, &sample_net_ops);
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}
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static void __exit sample_cleanup_module(void)
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{
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tcf_unregister_action(&act_sample_ops, &sample_net_ops);
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}
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module_init(sample_init_module);
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module_exit(sample_cleanup_module);
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2017-10-30 09:41:36 +00:00
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MODULE_AUTHOR("Yotam Gigi <yotam.gi@gmail.com>");
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2017-01-23 10:07:09 +00:00
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MODULE_DESCRIPTION("Packet sampling action");
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MODULE_LICENSE("GPL v2");
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