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1da177e4 LT |
1 | /* |
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> | |
16 | #include <linux/config.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/socket.h> | |
23 | #include <linux/sockios.h> | |
24 | #include <linux/in.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/netdevice.h> | |
28 | #include <linux/skbuff.h> | |
29 | #include <linux/rtnetlink.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/proc_fs.h> | |
33 | #include <net/sock.h> | |
34 | #include <net/pkt_sched.h> | |
35 | #include <linux/tc_act/tc_gact.h> | |
36 | #include <net/tc_act/tc_gact.h> | |
37 | ||
38 | /* use generic hash table */ | |
39 | #define MY_TAB_SIZE 16 | |
40 | #define MY_TAB_MASK 15 | |
41 | ||
42 | static u32 idx_gen; | |
43 | static struct tcf_gact *tcf_gact_ht[MY_TAB_SIZE]; | |
44 | static DEFINE_RWLOCK(gact_lock); | |
45 | ||
46 | /* ovewrride the defaults */ | |
47 | #define tcf_st tcf_gact | |
48 | #define tc_st tc_gact | |
49 | #define tcf_t_lock gact_lock | |
50 | #define tcf_ht tcf_gact_ht | |
51 | ||
52 | #define CONFIG_NET_ACT_INIT 1 | |
53 | #include <net/pkt_act.h> | |
54 | ||
55 | #ifdef CONFIG_GACT_PROB | |
56 | static int gact_net_rand(struct tcf_gact *p) | |
57 | { | |
58 | if (net_random()%p->pval) | |
59 | return p->action; | |
60 | return p->paction; | |
61 | } | |
62 | ||
63 | static int gact_determ(struct tcf_gact *p) | |
64 | { | |
65 | if (p->bstats.packets%p->pval) | |
66 | return p->action; | |
67 | return p->paction; | |
68 | } | |
69 | ||
70 | typedef int (*g_rand)(struct tcf_gact *p); | |
71 | static g_rand gact_rand[MAX_RAND]= { NULL, gact_net_rand, gact_determ }; | |
72 | #endif | |
73 | ||
74 | static int tcf_gact_init(struct rtattr *rta, struct rtattr *est, | |
75 | struct tc_action *a, int ovr, int bind) | |
76 | { | |
77 | struct rtattr *tb[TCA_GACT_MAX]; | |
78 | struct tc_gact *parm; | |
79 | struct tcf_gact *p; | |
80 | int ret = 0; | |
81 | ||
82 | if (rta == NULL || rtattr_parse_nested(tb, TCA_GACT_MAX, rta) < 0) | |
83 | return -EINVAL; | |
84 | ||
85 | if (tb[TCA_GACT_PARMS - 1] == NULL || | |
86 | RTA_PAYLOAD(tb[TCA_GACT_PARMS - 1]) < sizeof(*parm)) | |
87 | return -EINVAL; | |
88 | parm = RTA_DATA(tb[TCA_GACT_PARMS - 1]); | |
89 | ||
90 | if (tb[TCA_GACT_PROB-1] != NULL) | |
91 | #ifdef CONFIG_GACT_PROB | |
92 | if (RTA_PAYLOAD(tb[TCA_GACT_PROB-1]) < sizeof(struct tc_gact_p)) | |
93 | return -EINVAL; | |
94 | #else | |
95 | return -EOPNOTSUPP; | |
96 | #endif | |
97 | ||
98 | p = tcf_hash_check(parm->index, a, ovr, bind); | |
99 | if (p == NULL) { | |
100 | p = tcf_hash_create(parm->index, est, a, sizeof(*p), ovr, bind); | |
101 | if (p == NULL) | |
102 | return -ENOMEM; | |
103 | ret = ACT_P_CREATED; | |
104 | } else { | |
105 | if (!ovr) { | |
106 | tcf_hash_release(p, bind); | |
107 | return -EEXIST; | |
108 | } | |
109 | } | |
110 | ||
111 | spin_lock_bh(&p->lock); | |
112 | p->action = parm->action; | |
113 | #ifdef CONFIG_GACT_PROB | |
114 | if (tb[TCA_GACT_PROB-1] != NULL) { | |
115 | struct tc_gact_p *p_parm = RTA_DATA(tb[TCA_GACT_PROB-1]); | |
116 | p->paction = p_parm->paction; | |
117 | p->pval = p_parm->pval; | |
118 | p->ptype = p_parm->ptype; | |
119 | } | |
120 | #endif | |
121 | spin_unlock_bh(&p->lock); | |
122 | if (ret == ACT_P_CREATED) | |
123 | tcf_hash_insert(p); | |
124 | return ret; | |
125 | } | |
126 | ||
127 | static int | |
128 | tcf_gact_cleanup(struct tc_action *a, int bind) | |
129 | { | |
130 | struct tcf_gact *p = PRIV(a, gact); | |
131 | ||
132 | if (p != NULL) | |
133 | return tcf_hash_release(p, bind); | |
134 | return 0; | |
135 | } | |
136 | ||
137 | static int | |
138 | tcf_gact(struct sk_buff **pskb, struct tc_action *a) | |
139 | { | |
140 | struct tcf_gact *p = PRIV(a, gact); | |
141 | struct sk_buff *skb = *pskb; | |
142 | int action = TC_ACT_SHOT; | |
143 | ||
144 | spin_lock(&p->lock); | |
145 | #ifdef CONFIG_GACT_PROB | |
146 | if (p->ptype && gact_rand[p->ptype] != NULL) | |
147 | action = gact_rand[p->ptype](p); | |
148 | else | |
149 | action = p->action; | |
150 | #else | |
151 | action = p->action; | |
152 | #endif | |
153 | p->bstats.bytes += skb->len; | |
154 | p->bstats.packets++; | |
155 | if (action == TC_ACT_SHOT) | |
156 | p->qstats.drops++; | |
157 | p->tm.lastuse = jiffies; | |
158 | spin_unlock(&p->lock); | |
159 | ||
160 | return action; | |
161 | } | |
162 | ||
163 | static int | |
164 | tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
165 | { | |
166 | unsigned char *b = skb->tail; | |
167 | struct tc_gact opt; | |
168 | struct tcf_gact *p = PRIV(a, gact); | |
169 | struct tcf_t t; | |
170 | ||
171 | opt.index = p->index; | |
172 | opt.refcnt = p->refcnt - ref; | |
173 | opt.bindcnt = p->bindcnt - bind; | |
174 | opt.action = p->action; | |
175 | RTA_PUT(skb, TCA_GACT_PARMS, sizeof(opt), &opt); | |
176 | #ifdef CONFIG_GACT_PROB | |
177 | if (p->ptype) { | |
178 | struct tc_gact_p p_opt; | |
179 | p_opt.paction = p->paction; | |
180 | p_opt.pval = p->pval; | |
181 | p_opt.ptype = p->ptype; | |
182 | RTA_PUT(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt); | |
183 | } | |
184 | #endif | |
185 | t.install = jiffies_to_clock_t(jiffies - p->tm.install); | |
186 | t.lastuse = jiffies_to_clock_t(jiffies - p->tm.lastuse); | |
187 | t.expires = jiffies_to_clock_t(p->tm.expires); | |
188 | RTA_PUT(skb, TCA_GACT_TM, sizeof(t), &t); | |
189 | return skb->len; | |
190 | ||
191 | rtattr_failure: | |
192 | skb_trim(skb, b - skb->data); | |
193 | return -1; | |
194 | } | |
195 | ||
196 | static struct tc_action_ops act_gact_ops = { | |
197 | .kind = "gact", | |
198 | .type = TCA_ACT_GACT, | |
199 | .capab = TCA_CAP_NONE, | |
200 | .owner = THIS_MODULE, | |
201 | .act = tcf_gact, | |
202 | .dump = tcf_gact_dump, | |
203 | .cleanup = tcf_gact_cleanup, | |
204 | .lookup = tcf_hash_search, | |
205 | .init = tcf_gact_init, | |
206 | .walk = tcf_generic_walker | |
207 | }; | |
208 | ||
209 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); | |
210 | MODULE_DESCRIPTION("Generic Classifier actions"); | |
211 | MODULE_LICENSE("GPL"); | |
212 | ||
213 | static int __init | |
214 | gact_init_module(void) | |
215 | { | |
216 | #ifdef CONFIG_GACT_PROB | |
217 | printk("GACT probability on\n"); | |
218 | #else | |
219 | printk("GACT probability NOT on\n"); | |
220 | #endif | |
221 | return tcf_register_action(&act_gact_ops); | |
222 | } | |
223 | ||
224 | static void __exit | |
225 | gact_cleanup_module(void) | |
226 | { | |
227 | tcf_unregister_action(&act_gact_ops); | |
228 | } | |
229 | ||
230 | module_init(gact_init_module); | |
231 | module_exit(gact_cleanup_module); |