aboutsummaryrefslogtreecommitdiffstats
path: root/net/sched/gact.c
blob: a811c89fef7fd105e98f2b2dadf1518ff3eb0847 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
/*
 * net/sched/gact.c	Generic 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.
 *
 * copyright 	Jamal Hadi Salim (2002-4)
 *
 */

#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/bitops.h>
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <net/sock.h>
#include <net/pkt_sched.h>
#include <linux/tc_act/tc_gact.h>
#include <net/tc_act/tc_gact.h>

/* use generic hash table */
#define MY_TAB_SIZE	16
#define MY_TAB_MASK	15

static u32 idx_gen;
static struct tcf_gact *tcf_gact_ht[MY_TAB_SIZE];
static DEFINE_RWLOCK(gact_lock);

/* ovewrride the defaults */
#define tcf_st		tcf_gact
#define tc_st		tc_gact
#define tcf_t_lock	gact_lock
#define tcf_ht		tcf_gact_ht

#define CONFIG_NET_ACT_INIT 1
#include <net/pkt_act.h>

#ifdef CONFIG_GACT_PROB
static int gact_net_rand(struct tcf_gact *p)
{
	if (net_random()%p->pval)
		return p->action;
	return p->paction;
}

static int gact_determ(struct tcf_gact *p)
{
	if (p->bstats.packets%p->pval)
		return p->action;
	return p->paction;
}

typedef int (*g_rand)(struct tcf_gact *p);
static g_rand gact_rand[MAX_RAND]= { NULL, gact_net_rand, gact_determ };
#endif

static int tcf_gact_init(struct rtattr *rta, struct rtattr *est,
                         struct tc_action *a, int ovr, int bind)
{
	struct rtattr *tb[TCA_GACT_MAX];
	struct tc_gact *parm;
	struct tcf_gact *p;
	int ret = 0;

	if (rta == NULL || rtattr_parse_nested(tb, TCA_GACT_MAX, rta) < 0)
		return -EINVAL;

	if (tb[TCA_GACT_PARMS - 1] == NULL ||
	    RTA_PAYLOAD(tb[TCA_GACT_PARMS - 1]) < sizeof(*parm))
		return -EINVAL;
	parm = RTA_DATA(tb[TCA_GACT_PARMS - 1]);

	if (tb[TCA_GACT_PROB-1] != NULL)
#ifdef CONFIG_GACT_PROB
		if (RTA_PAYLOAD(tb[TCA_GACT_PROB-1]) < sizeof(struct tc_gact_p))
			return -EINVAL;
#else
		return -EOPNOTSUPP;
#endif

	p = tcf_hash_check(parm->index, a, ovr, bind);
	if (p == NULL) {
		p = tcf_hash_create(parm->index, est, a, sizeof(*p), ovr, bind);
		if (p == NULL)
			return -ENOMEM;
		ret = ACT_P_CREATED;
	} else {
		if (!ovr) {
			tcf_hash_release(p, bind);
			return -EEXIST;
		}
	}

	spin_lock_bh(&p->lock);
	p->action = parm->action;
#ifdef CONFIG_GACT_PROB
	if (tb[TCA_GACT_PROB-1] != NULL) {
		struct tc_gact_p *p_parm = RTA_DATA(tb[TCA_GACT_PROB-1]);
		p->paction = p_parm->paction;
		p->pval    = p_parm->pval;
		p->ptype   = p_parm->ptype;
	}
#endif
	spin_unlock_bh(&p->lock);
	if (ret == ACT_P_CREATED)
		tcf_hash_insert(p);
	return ret;
}

static int
tcf_gact_cleanup(struct tc_action *a, int bind)
{
	struct tcf_gact *p = PRIV(a, gact);

	if (p != NULL)
		return tcf_hash_release(p, bind);
	return 0;
}

static int
tcf_gact(struct sk_buff **pskb, struct tc_action *a)
{
	struct tcf_gact *p = PRIV(a, gact);
	struct sk_buff *skb = *pskb;
	int action = TC_ACT_SHOT;

	spin_lock(&p->lock);
#ifdef CONFIG_GACT_PROB
	if (p->ptype && gact_rand[p->ptype] != NULL)
		action = gact_rand[p->ptype](p);
	else
		action = p->action;
#else
	action = p->action;
#endif
	p->bstats.bytes += skb->len;
	p->bstats.packets++;
	if (action == TC_ACT_SHOT)
		p->qstats.drops++;
	p->tm.lastuse = jiffies;
	spin_unlock(&p->lock);

	return action;
}

static int
tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
{
	unsigned char *b = skb->tail;
	struct tc_gact opt;
	struct tcf_gact *p = PRIV(a, gact);
	struct tcf_t t;

	opt.index = p->index;
	opt.refcnt = p->refcnt - ref;
	opt.bindcnt = p->bindcnt - bind;
	opt.action = p->action;
	RTA_PUT(skb, TCA_GACT_PARMS, sizeof(opt), &opt);
#ifdef CONFIG_GACT_PROB
	if (p->ptype) {
		struct tc_gact_p p_opt;
		p_opt.paction = p->paction;
		p_opt.pval = p->pval;
		p_opt.ptype = p->ptype;
		RTA_PUT(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt);
	}
#endif
	t.install = jiffies_to_clock_t(jiffies - p->tm.install);
	t.lastuse = jiffies_to_clock_t(jiffies - p->tm.lastuse);
	t.expires = jiffies_to_clock_t(p->tm.expires);
	RTA_PUT(skb, TCA_GACT_TM, sizeof(t), &t);
	return skb->len;

      rtattr_failure:
	skb_trim(skb, b - skb->data);
	return -1;
}

static struct tc_action_ops act_gact_ops = {
	.kind		=	"gact",
	.type		=	TCA_ACT_GACT,
	.capab		=	TCA_CAP_NONE,
	.owner		=	THIS_MODULE,
	.act		=	tcf_gact,
	.dump		=	tcf_gact_dump,
	.cleanup	=	tcf_gact_cleanup,
	.lookup		=	tcf_hash_search,
	.init		=	tcf_gact_init,
	.walk		=	tcf_generic_walker
};

MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
MODULE_DESCRIPTION("Generic Classifier actions");
MODULE_LICENSE("GPL");

static int __init
gact_init_module(void)
{
#ifdef CONFIG_GACT_PROB
	printk("GACT probability on\n");
#else
	printk("GACT probability NOT on\n");
#endif
	return tcf_register_action(&act_gact_ops);
}

static void __exit
gact_cleanup_module(void)
{
	tcf_unregister_action(&act_gact_ops);
}

module_init(gact_init_module);
module_exit(gact_cleanup_module);