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Release 4.8 net/sched/act_mirred.c

Directory: net/sched
 * net/sched/act_mirred.c       packet mirroring and redirect actions
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 * Authors:     Jamal Hadi Salim (2002-4)
 * TODO: Add ingress support (and socket redirect support)

#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_mirred.h>
#include <net/tc_act/tc_mirred.h>

#include <linux/if_arp.h>

#define MIRRED_TAB_MASK     7
static LIST_HEAD(mirred_list);
static DEFINE_SPINLOCK(mirred_list_lock);

static void tcf_mirred_release(struct tc_action *a, int bind) { struct tcf_mirred *m = to_mirred(a); struct net_device *dev; /* We could be called either in a RCU callback or with RTNL lock held. */ spin_lock_bh(&mirred_list_lock); list_del(&m->tcfm_list); dev = rcu_dereference_protected(m->tcfm_dev, 1); if (dev) dev_put(dev); spin_unlock_bh(&mirred_list_lock); }


americo wangamerico wang3752.86%457.14%
jamal hadi salimjamal hadi salim1521.43%114.29%
stephen hemmingerstephen hemminger1115.71%114.29%
eric dumazeteric dumazet710.00%114.29%

static const struct nla_policy mirred_policy[TCA_MIRRED_MAX + 1] = { [TCA_MIRRED_PARMS] = { .len = sizeof(struct tc_mirred) }, }; static int mirred_net_id; static struct tc_action_ops act_mirred_ops;
static int tcf_mirred_init(struct net *net, struct nlattr *nla, struct nlattr *est, struct tc_action **a, int ovr, int bind) { struct tc_action_net *tn = net_generic(net, mirred_net_id); struct nlattr *tb[TCA_MIRRED_MAX + 1]; struct tc_mirred *parm; struct tcf_mirred *m; struct net_device *dev; int ret, ok_push = 0; bool exists = false; if (nla == NULL) return -EINVAL; ret = nla_parse_nested(tb, TCA_MIRRED_MAX, nla, mirred_policy); if (ret < 0) return ret; if (tb[TCA_MIRRED_PARMS] == NULL) return -EINVAL; parm = nla_data(tb[TCA_MIRRED_PARMS]); exists = tcf_hash_check(tn, parm->index, a, bind); if (exists && bind) return 0; switch (parm->eaction) { case TCA_EGRESS_MIRROR: case TCA_EGRESS_REDIR: break; default: if (exists) tcf_hash_release(*a, bind); return -EINVAL; } if (parm->ifindex) { dev = __dev_get_by_index(net, parm->ifindex); if (dev == NULL) { if (exists) tcf_hash_release(*a, bind); return -ENODEV; } switch (dev->type) { case ARPHRD_TUNNEL: case ARPHRD_TUNNEL6: case ARPHRD_SIT: case ARPHRD_IPGRE: case ARPHRD_VOID: case ARPHRD_NONE: ok_push = 0; break; default: ok_push = 1; break; } } else { dev = NULL; } if (!exists) { if (dev == NULL) return -EINVAL; ret = tcf_hash_create(tn, parm->index, est, a, &act_mirred_ops, bind, true); if (ret) return ret; ret = ACT_P_CREATED; } else { tcf_hash_release(*a, bind); if (!ovr) return -EEXIST; } m = to_mirred(*a); ASSERT_RTNL(); m->tcf_action = parm->action; m->tcfm_eaction = parm->eaction; if (dev != NULL) { m->tcfm_ifindex = parm->ifindex; if (ret != ACT_P_CREATED) dev_put(rcu_dereference_protected(m->tcfm_dev, 1)); dev_hold(dev); rcu_assign_pointer(m->tcfm_dev, dev); m->tcfm_ok_push = ok_push; } if (ret == ACT_P_CREATED) { spin_lock_bh(&mirred_list_lock); list_add(&m->tcfm_list, &mirred_list); spin_unlock_bh(&mirred_list_lock); tcf_hash_insert(tn, *a); } return ret; }


jamal hadi salimjamal hadi salim21846.09%28.33%
patrick mchardypatrick mchardy10622.41%729.17%
americo wangamerico wang5411.42%833.33%
changli gaochangli gao418.67%14.17%
david s. millerdavid s. miller214.44%14.17%
stephen hemmingerstephen hemminger132.75%14.17%
eric dumazeteric dumazet132.75%28.33%
benjamin lahaisebenjamin lahaise61.27%14.17%
eric w. biedermaneric w. biederman10.21%14.17%

static int tcf_mirred(struct sk_buff *skb, const struct tc_action *a, struct tcf_result *res) { struct tcf_mirred *m = to_mirred(a); struct net_device *dev; struct sk_buff *skb2; int retval, err; u32 at; tcf_lastuse_update(&m->tcf_tm); bstats_cpu_update(this_cpu_ptr(m->common.cpu_bstats), skb); rcu_read_lock(); retval = READ_ONCE(m->tcf_action); dev = rcu_dereference(m->tcfm_dev); if (unlikely(!dev)) { pr_notice_once("tc mirred: target device is gone\n"); goto out; } if (unlikely(!(dev->flags & IFF_UP))) { net_notice_ratelimited("tc mirred to Houston: device %s is down\n", dev->name); goto out; } at = G_TC_AT(skb->tc_verd); skb2 = skb_clone(skb, GFP_ATOMIC); if (!skb2) goto out; if (!(at & AT_EGRESS)) { if (m->tcfm_ok_push) skb_push_rcsum(skb2, skb->mac_len); } /* mirror is always swallowed */ if (m->tcfm_eaction != TCA_EGRESS_MIRROR) skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at); skb2->skb_iif = skb->dev->ifindex; skb2->dev = dev; err = dev_queue_xmit(skb2); if (err) { out: qstats_overlimit_inc(this_cpu_ptr(m->common.cpu_qstats)); if (m->tcfm_eaction != TCA_EGRESS_MIRROR) retval = TC_ACT_SHOT; } rcu_read_unlock(); return retval; }


jamal hadi salimjamal hadi salim12344.89%29.09%
changli gaochangli gao5218.98%313.64%
eric dumazeteric dumazet4817.52%418.18%
stephen hemmingerstephen hemminger155.47%14.55%
patrick mchardypatrick mchardy134.74%522.73%
jason wangjason wang82.92%14.55%
david s. millerdavid s. miller72.55%14.55%
americo wangamerico wang41.46%29.09%
herbert xuherbert xu20.73%14.55%
joe perchesjoe perches10.36%14.55%
florian westphalflorian westphal10.36%14.55%

static int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) { unsigned char *b = skb_tail_pointer(skb); struct tcf_mirred *m = to_mirred(a); struct tc_mirred opt = { .index = m->tcf_index, .action = m->tcf_action, .refcnt = m->tcf_refcnt - ref, .bindcnt = m->tcf_bindcnt - bind, .eaction = m->tcfm_eaction, .ifindex = m->tcfm_ifindex, }; struct tcf_t t; if (nla_put(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt)) goto nla_put_failure; tcf_tm_dump(&t, &m->tcf_tm); if (nla_put_64bit(skb, TCA_MIRRED_TM, sizeof(t), &t, TCA_MIRRED_PAD)) goto nla_put_failure; return skb->len; nla_put_failure: nlmsg_trim(skb, b); return -1; }


jamal hadi salimjamal hadi salim10964.50%321.43%
david s. millerdavid s. miller3218.93%214.29%
eric dumazeteric dumazet137.69%17.14%
patrick mchardypatrick mchardy52.96%428.57%
arnaldo carvalho de meloarnaldo carvalho de melo42.37%214.29%
nicolas dichtelnicolas dichtel31.78%17.14%
americo wangamerico wang31.78%17.14%

static int tcf_mirred_walker(struct net *net, struct sk_buff *skb, struct netlink_callback *cb, int type, const struct tc_action_ops *ops) { struct tc_action_net *tn = net_generic(net, mirred_net_id); return tcf_generic_walker(tn, skb, cb, type, ops); }


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static int tcf_mirred_search(struct net *net, struct tc_action **a, u32 index) { struct tc_action_net *tn = net_generic(net, mirred_net_id); return tcf_hash_search(tn, a, index); }


americo wangamerico wang42100.00%2100.00%

static int mirred_device_event(struct notifier_block *unused, unsigned long event, void *ptr) { struct net_device *dev = netdev_notifier_info_to_dev(ptr); struct tcf_mirred *m; ASSERT_RTNL(); if (event == NETDEV_UNREGISTER) { spin_lock_bh(&mirred_list_lock); list_for_each_entry(m, &mirred_list, tcfm_list) { if (rcu_access_pointer(m->tcfm_dev) == dev) { dev_put(dev); /* Note : no rcu grace period necessary, as * net_device are already rcu protected. */ RCU_INIT_POINTER(m->tcfm_dev, NULL); } } spin_unlock_bh(&mirred_list_lock); } return NOTIFY_DONE; }


stephen hemmingerstephen hemminger6869.39%120.00%
americo wangamerico wang1414.29%120.00%
eric dumazeteric dumazet1111.22%120.00%
jiri pirkojiri pirko33.06%120.00%
cong wangcong wang22.04%120.00%

static struct notifier_block mirred_device_notifier = { .notifier_call = mirred_device_event, }; static struct tc_action_ops act_mirred_ops = { .kind = "mirred", .type = TCA_ACT_MIRRED, .owner = THIS_MODULE, .act = tcf_mirred, .dump = tcf_mirred_dump, .cleanup = tcf_mirred_release, .init = tcf_mirred_init, .walk = tcf_mirred_walker, .lookup = tcf_mirred_search, .size = sizeof(struct tcf_mirred), };
static __net_init int mirred_init_net(struct net *net) { struct tc_action_net *tn = net_generic(net, mirred_net_id); return tc_action_net_init(tn, &act_mirred_ops, MIRRED_TAB_MASK); }


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static void __net_exit mirred_exit_net(struct net *net) { struct tc_action_net *tn = net_generic(net, mirred_net_id); tc_action_net_exit(tn); }


americo wangamerico wang29100.00%1100.00%

static struct pernet_operations mirred_net_ops = { .init = mirred_init_net, .exit = mirred_exit_net, .id = &mirred_net_id, .size = sizeof(struct tc_action_net), }; MODULE_AUTHOR("Jamal Hadi Salim(2002)"); MODULE_DESCRIPTION("Device Mirror/redirect actions"); MODULE_LICENSE("GPL");
static int __init mirred_init_module(void) { int err = register_netdevice_notifier(&mirred_device_notifier); if (err) return err; pr_info("Mirror/redirect action on\n"); return tcf_register_action(&act_mirred_ops, &mirred_net_ops); }


jamal hadi salimjamal hadi salim2050.00%120.00%
stephen hemmingerstephen hemminger1742.50%240.00%
americo wangamerico wang37.50%240.00%

static void __exit mirred_cleanup_module(void) { tcf_unregister_action(&act_mirred_ops, &mirred_net_ops); unregister_netdevice_notifier(&mirred_device_notifier); }


jamal hadi salimjamal hadi salim1354.17%125.00%
americo wangamerico wang729.17%250.00%
stephen hemmingerstephen hemminger416.67%125.00%

module_init(mirred_init_module); module_exit(mirred_cleanup_module);

Overall Contributors

jamal hadi salimjamal hadi salim60339.18%610.71%
americo wangamerico wang35122.81%1221.43%
patrick mchardypatrick mchardy1529.88%1119.64%
stephen hemmingerstephen hemminger1459.42%23.57%
changli gaochangli gao936.04%47.14%
eric dumazeteric dumazet925.98%610.71%
david s. millerdavid s. miller624.03%23.57%
jason wangjason wang80.52%11.79%
arnaldo carvalho de meloarnaldo carvalho de melo70.45%23.57%
benjamin lahaisebenjamin lahaise60.39%11.79%
jiri pirkojiri pirko40.26%23.57%
eric w. biedermaneric w. biederman40.26%11.79%
nicolas dichtelnicolas dichtel30.19%11.79%
tejun heotejun heo30.19%11.79%
herbert xuherbert xu20.13%11.79%
cong wangcong wang20.13%11.79%
florian westphalflorian westphal10.06%11.79%
joe perchesjoe perches10.06%11.79%
Directory: net/sched
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