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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#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 ACT_P_BOUND;
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; u8 cookie_data[TC_COOKIE_MAX_SIZE]; struct psample_metadata md = {}; struct tc_cookie *user_cookie; 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);
rcu_read_lock(); user_cookie = rcu_dereference(a->user_cookie); if (user_cookie) { memcpy(cookie_data, user_cookie->data, user_cookie->len); md.user_cookie = cookie_data; md.user_cookie_len = user_cookie->len; } rcu_read_unlock();
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 size_t tcf_sample_get_fill_size(const struct tc_action *act){ return nla_total_size(sizeof(struct tc_sample)) /* TCA_SAMPLE_PARMS */ + nla_total_size(sizeof(u32)) /* TCA_SAMPLE_RATE */ + nla_total_size(sizeof(u32)) /* TCA_SAMPLE_TRUNC_SIZE */ + nla_total_size(sizeof(u32)); /* TCA_SAMPLE_PSAMPLE_GROUP */}
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_fill_size = tcf_sample_get_fill_size, .get_psample_group = tcf_sample_get_group, .offload_act_setup = tcf_sample_offload_act_setup, .size = sizeof(struct tcf_sample),};MODULE_ALIAS_NET_ACT("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");