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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * net/sched/gact.c Generic actions
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * copyright Jamal Hadi Salim (2002-4)
10 *
11 */
12
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/types.h>
14#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/skbuff.h>
18#include <linux/rtnetlink.h>
19#include <linux/module.h>
20#include <linux/init.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070021#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <net/pkt_sched.h>
23#include <linux/tc_act/tc_gact.h>
24#include <net/tc_act/tc_gact.h>
25
David S. Millere9ce1cd2006-08-21 23:54:55 -070026#define GACT_TAB_MASK 15
27static struct tcf_common *tcf_gact_ht[GACT_TAB_MASK + 1];
28static u32 gact_idx_gen;
Linus Torvalds1da177e2005-04-16 15:20:36 -070029static DEFINE_RWLOCK(gact_lock);
30
David S. Millere9ce1cd2006-08-21 23:54:55 -070031static struct tcf_hashinfo gact_hash_info = {
32 .htab = tcf_gact_ht,
33 .hmask = GACT_TAB_MASK,
34 .lock = &gact_lock,
35};
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37#ifdef CONFIG_GACT_PROB
David S. Millere9ce1cd2006-08-21 23:54:55 -070038static int gact_net_rand(struct tcf_gact *gact)
Linus Torvalds1da177e2005-04-16 15:20:36 -070039{
Kim Nordlunda1631482006-12-01 20:21:44 -080040 if (!gact->tcfg_pval || net_random() % gact->tcfg_pval)
David S. Millere9ce1cd2006-08-21 23:54:55 -070041 return gact->tcf_action;
42 return gact->tcfg_paction;
Linus Torvalds1da177e2005-04-16 15:20:36 -070043}
44
David S. Millere9ce1cd2006-08-21 23:54:55 -070045static int gact_determ(struct tcf_gact *gact)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046{
Kim Nordlunda1631482006-12-01 20:21:44 -080047 if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval)
David S. Millere9ce1cd2006-08-21 23:54:55 -070048 return gact->tcf_action;
49 return gact->tcfg_paction;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050}
51
David S. Millere9ce1cd2006-08-21 23:54:55 -070052typedef int (*g_rand)(struct tcf_gact *gact);
Eric Dumazetcc7ec452011-01-19 19:26:56 +000053static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
David S. Millere9ce1cd2006-08-21 23:54:55 -070054#endif /* CONFIG_GACT_PROB */
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Patrick McHardy53b2bf32008-01-23 20:36:30 -080056static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
57 [TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) },
58 [TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) },
59};
60
Patrick McHardy7ba699c2008-01-22 22:11:50 -080061static int tcf_gact_init(struct nlattr *nla, struct nlattr *est,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +090062 struct tc_action *a, int ovr, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063{
Patrick McHardy7ba699c2008-01-22 22:11:50 -080064 struct nlattr *tb[TCA_GACT_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 struct tc_gact *parm;
David S. Millere9ce1cd2006-08-21 23:54:55 -070066 struct tcf_gact *gact;
67 struct tcf_common *pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 int ret = 0;
Patrick McHardycee63722008-01-23 20:33:32 -080069 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Patrick McHardycee63722008-01-23 20:33:32 -080071 if (nla == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 return -EINVAL;
73
Patrick McHardy53b2bf32008-01-23 20:36:30 -080074 err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy);
Patrick McHardycee63722008-01-23 20:33:32 -080075 if (err < 0)
76 return err;
77
Patrick McHardy53b2bf32008-01-23 20:36:30 -080078 if (tb[TCA_GACT_PARMS] == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 return -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -080080 parm = nla_data(tb[TCA_GACT_PARMS]);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
Patrick McHardy53b2bf32008-01-23 20:36:30 -080082#ifndef CONFIG_GACT_PROB
Patrick McHardy7ba699c2008-01-22 22:11:50 -080083 if (tb[TCA_GACT_PROB] != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 return -EOPNOTSUPP;
85#endif
86
David S. Millere9ce1cd2006-08-21 23:54:55 -070087 pc = tcf_hash_check(parm->index, a, bind, &gact_hash_info);
88 if (!pc) {
89 pc = tcf_hash_create(parm->index, est, a, sizeof(*gact),
90 bind, &gact_idx_gen, &gact_hash_info);
Stephen Hemminger0e991ec2008-11-25 21:12:32 -080091 if (IS_ERR(pc))
Eric Dumazetcc7ec452011-01-19 19:26:56 +000092 return PTR_ERR(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 ret = ACT_P_CREATED;
94 } else {
95 if (!ovr) {
David S. Millere9ce1cd2006-08-21 23:54:55 -070096 tcf_hash_release(pc, bind, &gact_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 return -EEXIST;
98 }
99 }
100
David S. Millere9ce1cd2006-08-21 23:54:55 -0700101 gact = to_gact(pc);
102
103 spin_lock_bh(&gact->tcf_lock);
104 gact->tcf_action = parm->action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105#ifdef CONFIG_GACT_PROB
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800106 if (tb[TCA_GACT_PROB] != NULL) {
107 struct tc_gact_p *p_parm = nla_data(tb[TCA_GACT_PROB]);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700108 gact->tcfg_paction = p_parm->paction;
109 gact->tcfg_pval = p_parm->pval;
110 gact->tcfg_ptype = p_parm->ptype;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 }
112#endif
David S. Millere9ce1cd2006-08-21 23:54:55 -0700113 spin_unlock_bh(&gact->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 if (ret == ACT_P_CREATED)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700115 tcf_hash_insert(pc, &gact_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 return ret;
117}
118
David S. Millere9ce1cd2006-08-21 23:54:55 -0700119static int tcf_gact_cleanup(struct tc_action *a, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120{
David S. Millere9ce1cd2006-08-21 23:54:55 -0700121 struct tcf_gact *gact = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
David S. Millere9ce1cd2006-08-21 23:54:55 -0700123 if (gact)
124 return tcf_hash_release(&gact->common, bind, &gact_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 return 0;
126}
127
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000128static int tcf_gact(struct sk_buff *skb, const struct tc_action *a,
129 struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
David S. Millere9ce1cd2006-08-21 23:54:55 -0700131 struct tcf_gact *gact = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 int action = TC_ACT_SHOT;
133
David S. Millere9ce1cd2006-08-21 23:54:55 -0700134 spin_lock(&gact->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135#ifdef CONFIG_GACT_PROB
David S. Millere9ce1cd2006-08-21 23:54:55 -0700136 if (gact->tcfg_ptype && gact_rand[gact->tcfg_ptype] != NULL)
137 action = gact_rand[gact->tcfg_ptype](gact);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 else
David S. Millere9ce1cd2006-08-21 23:54:55 -0700139 action = gact->tcf_action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140#else
David S. Millere9ce1cd2006-08-21 23:54:55 -0700141 action = gact->tcf_action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142#endif
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700143 gact->tcf_bstats.bytes += qdisc_pkt_len(skb);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700144 gact->tcf_bstats.packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 if (action == TC_ACT_SHOT)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700146 gact->tcf_qstats.drops++;
147 gact->tcf_tm.lastuse = jiffies;
148 spin_unlock(&gact->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
150 return action;
151}
152
David S. Millere9ce1cd2006-08-21 23:54:55 -0700153static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700155 unsigned char *b = skb_tail_pointer(skb);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700156 struct tcf_gact *gact = a->priv;
Eric Dumazet1c40be12010-08-16 20:04:22 +0000157 struct tc_gact opt = {
158 .index = gact->tcf_index,
159 .refcnt = gact->tcf_refcnt - ref,
160 .bindcnt = gact->tcf_bindcnt - bind,
161 .action = gact->tcf_action,
162 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 struct tcf_t t;
164
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800165 NLA_PUT(skb, TCA_GACT_PARMS, sizeof(opt), &opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166#ifdef CONFIG_GACT_PROB
David S. Millere9ce1cd2006-08-21 23:54:55 -0700167 if (gact->tcfg_ptype) {
Eric Dumazet1c40be12010-08-16 20:04:22 +0000168 struct tc_gact_p p_opt = {
169 .paction = gact->tcfg_paction,
170 .pval = gact->tcfg_pval,
171 .ptype = gact->tcfg_ptype,
172 };
173
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800174 NLA_PUT(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 }
176#endif
David S. Millere9ce1cd2006-08-21 23:54:55 -0700177 t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install);
178 t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse);
179 t.expires = jiffies_to_clock_t(gact->tcf_tm.expires);
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800180 NLA_PUT(skb, TCA_GACT_TM, sizeof(t), &t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 return skb->len;
182
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800183nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700184 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 return -1;
186}
187
188static struct tc_action_ops act_gact_ops = {
189 .kind = "gact",
David S. Millere9ce1cd2006-08-21 23:54:55 -0700190 .hinfo = &gact_hash_info,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 .type = TCA_ACT_GACT,
192 .capab = TCA_CAP_NONE,
193 .owner = THIS_MODULE,
194 .act = tcf_gact,
195 .dump = tcf_gact_dump,
196 .cleanup = tcf_gact_cleanup,
197 .lookup = tcf_hash_search,
198 .init = tcf_gact_init,
199 .walk = tcf_generic_walker
200};
201
202MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
203MODULE_DESCRIPTION("Generic Classifier actions");
204MODULE_LICENSE("GPL");
205
David S. Millere9ce1cd2006-08-21 23:54:55 -0700206static int __init gact_init_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207{
208#ifdef CONFIG_GACT_PROB
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000209 pr_info("GACT probability on\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210#else
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000211 pr_info("GACT probability NOT on\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212#endif
213 return tcf_register_action(&act_gact_ops);
214}
215
David S. Millere9ce1cd2006-08-21 23:54:55 -0700216static void __exit gact_cleanup_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217{
218 tcf_unregister_action(&act_gact_ops);
219}
220
221module_init(gact_init_module);
222module_exit(gact_cleanup_module);