cregit-Linux how code gets into the kernel

Release 4.15 net/sched/act_simple.c

Directory: net/sched
/*
 * net/sched/act_simple.c       Simple example of an action
 *
 *              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 (2005-8)
 *
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>


#define TCA_ACT_SIMP 22

#include <linux/tc_act/tc_defact.h>
#include <net/tc_act/tc_defact.h>


static unsigned int simp_net_id;

static struct tc_action_ops act_simp_ops;


#define SIMP_MAX_DATA	32

static int tcf_simp(struct sk_buff *skb, const struct tc_action *a, struct tcf_result *res) { struct tcf_defact *d = to_defact(a); spin_lock(&d->tcf_lock); tcf_lastuse_update(&d->tcf_tm); bstats_update(&d->tcf_bstats, skb); /* print policy string followed by _ then packet count * Example if this was the 3rd packet and the string was "hello" * then it would look like "hello_3" (without quotes) */ pr_info("simple: %s_%d\n", (char *)d->tcfd_defdata, d->tcf_bstats.packets); spin_unlock(&d->tcf_lock); return d->tcf_action; }

Contributors

PersonTokensPropCommitsCommitProp
Jamal Hadi Salim5964.84%218.18%
David S. Miller1516.48%19.09%
Patrick McHardy66.59%218.18%
Eric Dumazet66.59%327.27%
Américo Wang33.30%19.09%
Stephen Hemminger11.10%19.09%
Jussi Kivilinna11.10%19.09%
Total91100.00%11100.00%


static void tcf_simp_release(struct tc_action *a, int bind) { struct tcf_defact *d = to_defact(a); kfree(d->tcfd_defdata); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller1651.61%125.00%
Américo Wang1341.94%250.00%
Jamal Hadi Salim26.45%125.00%
Total31100.00%4100.00%


static int alloc_defdata(struct tcf_defact *d, char *defdata) { d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL); if (unlikely(!d->tcfd_defdata)) return -ENOMEM; strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller3972.22%125.00%
Dan Carpenter1222.22%125.00%
Jamal Hadi Salim35.56%250.00%
Total54100.00%4100.00%


static void reset_policy(struct tcf_defact *d, char *defdata, struct tc_defact *p) { spin_lock_bh(&d->tcf_lock); d->tcf_action = p->action; memset(d->tcfd_defdata, 0, SIMP_MAX_DATA); strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); spin_unlock_bh(&d->tcf_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Jamal Hadi Salim4466.67%375.00%
David S. Miller2233.33%125.00%
Total66100.00%4100.00%

static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = { [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) }, [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA }, };
static int tcf_simp_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, simp_net_id); struct nlattr *tb[TCA_DEF_MAX + 1]; struct tc_defact *parm; struct tcf_defact *d; bool exists = false; int ret = 0, err; char *defdata; if (nla == NULL) return -EINVAL; err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy, NULL); if (err < 0) return err; if (tb[TCA_DEF_PARMS] == NULL) return -EINVAL; parm = nla_data(tb[TCA_DEF_PARMS]); exists = tcf_idr_check(tn, parm->index, a, bind); if (exists && bind) return 0; if (tb[TCA_DEF_DATA] == NULL) { if (exists) tcf_idr_release(*a, bind); return -EINVAL; } defdata = nla_data(tb[TCA_DEF_DATA]); if (!exists) { ret = tcf_idr_create(tn, parm->index, est, a, &act_simp_ops, bind, false); if (ret) return ret; d = to_defact(*a); ret = alloc_defdata(d, defdata); if (ret < 0) { tcf_idr_cleanup(*a, est); return ret; } d->tcf_action = parm->action; ret = ACT_P_CREATED; } else { d = to_defact(*a); tcf_idr_release(*a, bind); if (!ovr) return -EEXIST; reset_policy(d, defdata, parm); } if (ret == ACT_P_CREATED) tcf_idr_insert(tn, *a); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller17852.82%15.88%
Jamal Hadi Salim7421.96%423.53%
Américo Wang4513.35%529.41%
Patrick McHardy247.12%211.76%
Chris Mi61.78%15.88%
Benjamin LaHaise51.48%15.88%
Johannes Berg20.59%15.88%
Eric Dumazet20.59%15.88%
Hiroaki SHIMODA10.30%15.88%
Total337100.00%17100.00%


static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) { unsigned char *b = skb_tail_pointer(skb); struct tcf_defact *d = to_defact(a); struct tc_defact opt = { .index = d->tcf_index, .refcnt = d->tcf_refcnt - ref, .bindcnt = d->tcf_bindcnt - bind, .action = d->tcf_action, }; struct tcf_t t; if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) || nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata)) goto nla_put_failure; tcf_tm_dump(&t, &d->tcf_tm); if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD)) goto nla_put_failure; return skb->len; nla_put_failure: nlmsg_trim(skb, b); return -1; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller13983.73%220.00%
Eric Dumazet116.63%110.00%
Jamal Hadi Salim53.01%220.00%
Arnaldo Carvalho de Melo42.41%220.00%
Nicolas Dichtel31.81%110.00%
Américo Wang31.81%110.00%
Patrick McHardy10.60%110.00%
Total166100.00%10100.00%


static int tcf_simp_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, simp_net_id); return tcf_generic_walker(tn, skb, cb, type, ops); }

Contributors

PersonTokensPropCommitsCommitProp
Américo Wang56100.00%2100.00%
Total56100.00%2100.00%


static int tcf_simp_search(struct net *net, struct tc_action **a, u32 index) { struct tc_action_net *tn = net_generic(net, simp_net_id); return tcf_idr_search(tn, a, index); }

Contributors

PersonTokensPropCommitsCommitProp
Américo Wang4197.62%266.67%
Chris Mi12.38%133.33%
Total42100.00%3100.00%

static struct tc_action_ops act_simp_ops = { .kind = "simple", .type = TCA_ACT_SIMP, .owner = THIS_MODULE, .act = tcf_simp, .dump = tcf_simp_dump, .cleanup = tcf_simp_release, .init = tcf_simp_init, .walk = tcf_simp_walker, .lookup = tcf_simp_search, .size = sizeof(struct tcf_defact), };
static __net_init int simp_init_net(struct net *net) { struct tc_action_net *tn = net_generic(net, simp_net_id); return tc_action_net_init(tn, &act_simp_ops); }

Contributors

PersonTokensPropCommitsCommitProp
Américo Wang33100.00%1100.00%
Total33100.00%1100.00%


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

Contributors

PersonTokensPropCommitsCommitProp
Américo Wang29100.00%1100.00%
Total29100.00%1100.00%

static struct pernet_operations simp_net_ops = { .init = simp_init_net, .exit = simp_exit_net, .id = &simp_net_id, .size = sizeof(struct tc_action_net), }; MODULE_AUTHOR("Jamal Hadi Salim(2005)"); MODULE_DESCRIPTION("Simple example action"); MODULE_LICENSE("GPL");
static int __init simp_init_module(void) { int ret = tcf_register_action(&act_simp_ops, &simp_net_ops); if (!ret) pr_info("Simple TC action Loaded\n"); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jamal Hadi Salim2882.35%125.00%
Américo Wang514.71%250.00%
Stephen Hemminger12.94%125.00%
Total34100.00%4100.00%


static void __exit simp_cleanup_module(void) { tcf_unregister_action(&act_simp_ops, &simp_net_ops); }

Contributors

PersonTokensPropCommitsCommitProp
Jamal Hadi Salim1583.33%150.00%
Américo Wang316.67%150.00%
Total18100.00%2100.00%

module_init(simp_init_module); module_exit(simp_cleanup_module);

Overall Contributors

PersonTokensPropCommitsCommitProp
David S. Miller45238.70%37.32%
Jamal Hadi Salim30125.77%819.51%
Américo Wang29225.00%717.07%
Patrick McHardy595.05%512.20%
Eric Dumazet191.63%512.20%
Dan Carpenter121.03%12.44%
Chris Mi70.60%12.44%
Arnaldo Carvalho de Melo70.60%24.88%
Benjamin LaHaise50.43%12.44%
Tejun Heo30.26%12.44%
Nicolas Dichtel30.26%12.44%
Stephen Hemminger20.17%12.44%
Johannes Berg20.17%12.44%
Alexey Dobriyan10.09%12.44%
Hiroaki SHIMODA10.09%12.44%
Jiri Pirko10.09%12.44%
Jussi Kivilinna10.09%12.44%
Total1168100.00%41100.00%
Directory: net/sched
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