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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
13#include <asm/uaccess.h>
14#include <asm/system.h>
15#include <linux/bitops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/types.h>
17#include <linux/kernel.h>
18#include <linux/sched.h>
19#include <linux/string.h>
20#include <linux/mm.h>
21#include <linux/socket.h>
22#include <linux/sockios.h>
23#include <linux/in.h>
24#include <linux/errno.h>
25#include <linux/interrupt.h>
26#include <linux/netdevice.h>
27#include <linux/skbuff.h>
28#include <linux/rtnetlink.h>
29#include <linux/module.h>
30#include <linux/init.h>
31#include <linux/proc_fs.h>
32#include <net/sock.h>
33#include <net/pkt_sched.h>
34#include <linux/tc_act/tc_gact.h>
35#include <net/tc_act/tc_gact.h>
36
David S. Millere9ce1cd2006-08-21 23:54:55 -070037#define GACT_TAB_MASK 15
38static struct tcf_common *tcf_gact_ht[GACT_TAB_MASK + 1];
39static u32 gact_idx_gen;
Linus Torvalds1da177e2005-04-16 15:20:36 -070040static DEFINE_RWLOCK(gact_lock);
41
David S. Millere9ce1cd2006-08-21 23:54:55 -070042static struct tcf_hashinfo gact_hash_info = {
43 .htab = tcf_gact_ht,
44 .hmask = GACT_TAB_MASK,
45 .lock = &gact_lock,
46};
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48#ifdef CONFIG_GACT_PROB
David S. Millere9ce1cd2006-08-21 23:54:55 -070049static int gact_net_rand(struct tcf_gact *gact)
Linus Torvalds1da177e2005-04-16 15:20:36 -070050{
David S. Millere9ce1cd2006-08-21 23:54:55 -070051 if (net_random() % gact->tcfg_pval)
52 return gact->tcf_action;
53 return gact->tcfg_paction;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054}
55
David S. Millere9ce1cd2006-08-21 23:54:55 -070056static int gact_determ(struct tcf_gact *gact)
Linus Torvalds1da177e2005-04-16 15:20:36 -070057{
David S. Millere9ce1cd2006-08-21 23:54:55 -070058 if (gact->tcf_bstats.packets % gact->tcfg_pval)
59 return gact->tcf_action;
60 return gact->tcfg_paction;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061}
62
David S. Millere9ce1cd2006-08-21 23:54:55 -070063typedef int (*g_rand)(struct tcf_gact *gact);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064static g_rand gact_rand[MAX_RAND]= { NULL, gact_net_rand, gact_determ };
David S. Millere9ce1cd2006-08-21 23:54:55 -070065#endif /* CONFIG_GACT_PROB */
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
67static int tcf_gact_init(struct rtattr *rta, struct rtattr *est,
68 struct tc_action *a, int ovr, int bind)
69{
70 struct rtattr *tb[TCA_GACT_MAX];
71 struct tc_gact *parm;
David S. Millere9ce1cd2006-08-21 23:54:55 -070072 struct tcf_gact *gact;
73 struct tcf_common *pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 int ret = 0;
75
76 if (rta == NULL || rtattr_parse_nested(tb, TCA_GACT_MAX, rta) < 0)
77 return -EINVAL;
78
79 if (tb[TCA_GACT_PARMS - 1] == NULL ||
80 RTA_PAYLOAD(tb[TCA_GACT_PARMS - 1]) < sizeof(*parm))
81 return -EINVAL;
82 parm = RTA_DATA(tb[TCA_GACT_PARMS - 1]);
83
84 if (tb[TCA_GACT_PROB-1] != NULL)
85#ifdef CONFIG_GACT_PROB
86 if (RTA_PAYLOAD(tb[TCA_GACT_PROB-1]) < sizeof(struct tc_gact_p))
87 return -EINVAL;
88#else
89 return -EOPNOTSUPP;
90#endif
91
David S. Millere9ce1cd2006-08-21 23:54:55 -070092 pc = tcf_hash_check(parm->index, a, bind, &gact_hash_info);
93 if (!pc) {
94 pc = tcf_hash_create(parm->index, est, a, sizeof(*gact),
95 bind, &gact_idx_gen, &gact_hash_info);
96 if (unlikely(!pc))
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 return -ENOMEM;
98 ret = ACT_P_CREATED;
99 } else {
100 if (!ovr) {
David S. Millere9ce1cd2006-08-21 23:54:55 -0700101 tcf_hash_release(pc, bind, &gact_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 return -EEXIST;
103 }
104 }
105
David S. Millere9ce1cd2006-08-21 23:54:55 -0700106 gact = to_gact(pc);
107
108 spin_lock_bh(&gact->tcf_lock);
109 gact->tcf_action = parm->action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110#ifdef CONFIG_GACT_PROB
111 if (tb[TCA_GACT_PROB-1] != NULL) {
112 struct tc_gact_p *p_parm = RTA_DATA(tb[TCA_GACT_PROB-1]);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700113 gact->tcfg_paction = p_parm->paction;
114 gact->tcfg_pval = p_parm->pval;
115 gact->tcfg_ptype = p_parm->ptype;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 }
117#endif
David S. Millere9ce1cd2006-08-21 23:54:55 -0700118 spin_unlock_bh(&gact->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 if (ret == ACT_P_CREATED)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700120 tcf_hash_insert(pc, &gact_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 return ret;
122}
123
David S. Millere9ce1cd2006-08-21 23:54:55 -0700124static int tcf_gact_cleanup(struct tc_action *a, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{
David S. Millere9ce1cd2006-08-21 23:54:55 -0700126 struct tcf_gact *gact = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
David S. Millere9ce1cd2006-08-21 23:54:55 -0700128 if (gact)
129 return tcf_hash_release(&gact->common, bind, &gact_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 return 0;
131}
132
David S. Millere9ce1cd2006-08-21 23:54:55 -0700133static int tcf_gact(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134{
David S. Millere9ce1cd2006-08-21 23:54:55 -0700135 struct tcf_gact *gact = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 int action = TC_ACT_SHOT;
137
David S. Millere9ce1cd2006-08-21 23:54:55 -0700138 spin_lock(&gact->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139#ifdef CONFIG_GACT_PROB
David S. Millere9ce1cd2006-08-21 23:54:55 -0700140 if (gact->tcfg_ptype && gact_rand[gact->tcfg_ptype] != NULL)
141 action = gact_rand[gact->tcfg_ptype](gact);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 else
David S. Millere9ce1cd2006-08-21 23:54:55 -0700143 action = gact->tcf_action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144#else
David S. Millere9ce1cd2006-08-21 23:54:55 -0700145 action = gact->tcf_action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146#endif
David S. Millere9ce1cd2006-08-21 23:54:55 -0700147 gact->tcf_bstats.bytes += skb->len;
148 gact->tcf_bstats.packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 if (action == TC_ACT_SHOT)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700150 gact->tcf_qstats.drops++;
151 gact->tcf_tm.lastuse = jiffies;
152 spin_unlock(&gact->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
154 return action;
155}
156
David S. Millere9ce1cd2006-08-21 23:54:55 -0700157static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158{
159 unsigned char *b = skb->tail;
160 struct tc_gact opt;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700161 struct tcf_gact *gact = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 struct tcf_t t;
163
David S. Millere9ce1cd2006-08-21 23:54:55 -0700164 opt.index = gact->tcf_index;
165 opt.refcnt = gact->tcf_refcnt - ref;
166 opt.bindcnt = gact->tcf_bindcnt - bind;
167 opt.action = gact->tcf_action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 RTA_PUT(skb, TCA_GACT_PARMS, sizeof(opt), &opt);
169#ifdef CONFIG_GACT_PROB
David S. Millere9ce1cd2006-08-21 23:54:55 -0700170 if (gact->tcfg_ptype) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 struct tc_gact_p p_opt;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700172 p_opt.paction = gact->tcfg_paction;
173 p_opt.pval = gact->tcfg_pval;
174 p_opt.ptype = gact->tcfg_ptype;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 RTA_PUT(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt);
176 }
177#endif
David S. Millere9ce1cd2006-08-21 23:54:55 -0700178 t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install);
179 t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse);
180 t.expires = jiffies_to_clock_t(gact->tcf_tm.expires);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 RTA_PUT(skb, TCA_GACT_TM, sizeof(t), &t);
182 return skb->len;
183
David S. Millere9ce1cd2006-08-21 23:54:55 -0700184rtattr_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 skb_trim(skb, b - skb->data);
186 return -1;
187}
188
189static struct tc_action_ops act_gact_ops = {
190 .kind = "gact",
David S. Millere9ce1cd2006-08-21 23:54:55 -0700191 .hinfo = &gact_hash_info,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 .type = TCA_ACT_GACT,
193 .capab = TCA_CAP_NONE,
194 .owner = THIS_MODULE,
195 .act = tcf_gact,
196 .dump = tcf_gact_dump,
197 .cleanup = tcf_gact_cleanup,
198 .lookup = tcf_hash_search,
199 .init = tcf_gact_init,
200 .walk = tcf_generic_walker
201};
202
203MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
204MODULE_DESCRIPTION("Generic Classifier actions");
205MODULE_LICENSE("GPL");
206
David S. Millere9ce1cd2006-08-21 23:54:55 -0700207static int __init gact_init_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208{
209#ifdef CONFIG_GACT_PROB
210 printk("GACT probability on\n");
211#else
212 printk("GACT probability NOT on\n");
213#endif
214 return tcf_register_action(&act_gact_ops);
215}
216
David S. Millere9ce1cd2006-08-21 23:54:55 -0700217static void __exit gact_cleanup_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218{
219 tcf_unregister_action(&act_gact_ops);
220}
221
222module_init(gact_init_module);
223module_exit(gact_cleanup_module);