Merge master.kernel.org:/pub/scm/linux/kernel/git/kyle/parisc-2.6
[linux-2.6] / net / sched / act_gact.c
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/types.h>
17 #include <linux/kernel.h>
18 #include <linux/string.h>
19 #include <linux/mm.h>
20 #include <linux/socket.h>
21 #include <linux/sockios.h>
22 #include <linux/in.h>
23 #include <linux/errno.h>
24 #include <linux/interrupt.h>
25 #include <linux/netdevice.h>
26 #include <linux/skbuff.h>
27 #include <linux/rtnetlink.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/proc_fs.h>
31 #include <net/sock.h>
32 #include <net/pkt_sched.h>
33 #include <linux/tc_act/tc_gact.h>
34 #include <net/tc_act/tc_gact.h>
35
36 #define GACT_TAB_MASK   15
37 static struct tcf_common *tcf_gact_ht[GACT_TAB_MASK + 1];
38 static u32 gact_idx_gen;
39 static DEFINE_RWLOCK(gact_lock);
40
41 static struct tcf_hashinfo gact_hash_info = {
42         .htab   =       tcf_gact_ht,
43         .hmask  =       GACT_TAB_MASK,
44         .lock   =       &gact_lock,
45 };
46
47 #ifdef CONFIG_GACT_PROB
48 static int gact_net_rand(struct tcf_gact *gact)
49 {
50         if (!gact->tcfg_pval || net_random() % gact->tcfg_pval)
51                 return gact->tcf_action;
52         return gact->tcfg_paction;
53 }
54
55 static int gact_determ(struct tcf_gact *gact)
56 {
57         if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval)
58                 return gact->tcf_action;
59         return gact->tcfg_paction;
60 }
61
62 typedef int (*g_rand)(struct tcf_gact *gact);
63 static g_rand gact_rand[MAX_RAND]= { NULL, gact_net_rand, gact_determ };
64 #endif /* CONFIG_GACT_PROB */
65
66 static int tcf_gact_init(struct rtattr *rta, struct rtattr *est,
67                          struct tc_action *a, int ovr, int bind)
68 {
69         struct rtattr *tb[TCA_GACT_MAX];
70         struct tc_gact *parm;
71         struct tcf_gact *gact;
72         struct tcf_common *pc;
73         int ret = 0;
74
75         if (rta == NULL || rtattr_parse_nested(tb, TCA_GACT_MAX, rta) < 0)
76                 return -EINVAL;
77
78         if (tb[TCA_GACT_PARMS - 1] == NULL ||
79             RTA_PAYLOAD(tb[TCA_GACT_PARMS - 1]) < sizeof(*parm))
80                 return -EINVAL;
81         parm = RTA_DATA(tb[TCA_GACT_PARMS - 1]);
82
83         if (tb[TCA_GACT_PROB-1] != NULL)
84 #ifdef CONFIG_GACT_PROB
85                 if (RTA_PAYLOAD(tb[TCA_GACT_PROB-1]) < sizeof(struct tc_gact_p))
86                         return -EINVAL;
87 #else
88                 return -EOPNOTSUPP;
89 #endif
90
91         pc = tcf_hash_check(parm->index, a, bind, &gact_hash_info);
92         if (!pc) {
93                 pc = tcf_hash_create(parm->index, est, a, sizeof(*gact),
94                                      bind, &gact_idx_gen, &gact_hash_info);
95                 if (unlikely(!pc))
96                         return -ENOMEM;
97                 ret = ACT_P_CREATED;
98         } else {
99                 if (!ovr) {
100                         tcf_hash_release(pc, bind, &gact_hash_info);
101                         return -EEXIST;
102                 }
103         }
104
105         gact = to_gact(pc);
106
107         spin_lock_bh(&gact->tcf_lock);
108         gact->tcf_action = parm->action;
109 #ifdef CONFIG_GACT_PROB
110         if (tb[TCA_GACT_PROB-1] != NULL) {
111                 struct tc_gact_p *p_parm = RTA_DATA(tb[TCA_GACT_PROB-1]);
112                 gact->tcfg_paction = p_parm->paction;
113                 gact->tcfg_pval    = p_parm->pval;
114                 gact->tcfg_ptype   = p_parm->ptype;
115         }
116 #endif
117         spin_unlock_bh(&gact->tcf_lock);
118         if (ret == ACT_P_CREATED)
119                 tcf_hash_insert(pc, &gact_hash_info);
120         return ret;
121 }
122
123 static int tcf_gact_cleanup(struct tc_action *a, int bind)
124 {
125         struct tcf_gact *gact = a->priv;
126
127         if (gact)
128                 return tcf_hash_release(&gact->common, bind, &gact_hash_info);
129         return 0;
130 }
131
132 static int tcf_gact(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)
133 {
134         struct tcf_gact *gact = a->priv;
135         int action = TC_ACT_SHOT;
136
137         spin_lock(&gact->tcf_lock);
138 #ifdef CONFIG_GACT_PROB
139         if (gact->tcfg_ptype && gact_rand[gact->tcfg_ptype] != NULL)
140                 action = gact_rand[gact->tcfg_ptype](gact);
141         else
142                 action = gact->tcf_action;
143 #else
144         action = gact->tcf_action;
145 #endif
146         gact->tcf_bstats.bytes += skb->len;
147         gact->tcf_bstats.packets++;
148         if (action == TC_ACT_SHOT)
149                 gact->tcf_qstats.drops++;
150         gact->tcf_tm.lastuse = jiffies;
151         spin_unlock(&gact->tcf_lock);
152
153         return action;
154 }
155
156 static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
157 {
158         unsigned char *b = skb->tail;
159         struct tc_gact opt;
160         struct tcf_gact *gact = a->priv;
161         struct tcf_t t;
162
163         opt.index = gact->tcf_index;
164         opt.refcnt = gact->tcf_refcnt - ref;
165         opt.bindcnt = gact->tcf_bindcnt - bind;
166         opt.action = gact->tcf_action;
167         RTA_PUT(skb, TCA_GACT_PARMS, sizeof(opt), &opt);
168 #ifdef CONFIG_GACT_PROB
169         if (gact->tcfg_ptype) {
170                 struct tc_gact_p p_opt;
171                 p_opt.paction = gact->tcfg_paction;
172                 p_opt.pval = gact->tcfg_pval;
173                 p_opt.ptype = gact->tcfg_ptype;
174                 RTA_PUT(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt);
175         }
176 #endif
177         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);
180         RTA_PUT(skb, TCA_GACT_TM, sizeof(t), &t);
181         return skb->len;
182
183 rtattr_failure:
184         skb_trim(skb, b - skb->data);
185         return -1;
186 }
187
188 static struct tc_action_ops act_gact_ops = {
189         .kind           =       "gact",
190         .hinfo          =       &gact_hash_info,
191         .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
202 MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
203 MODULE_DESCRIPTION("Generic Classifier actions");
204 MODULE_LICENSE("GPL");
205
206 static int __init gact_init_module(void)
207 {
208 #ifdef CONFIG_GACT_PROB
209         printk("GACT probability on\n");
210 #else
211         printk("GACT probability NOT on\n");
212 #endif
213         return tcf_register_action(&act_gact_ops);
214 }
215
216 static void __exit gact_cleanup_module(void)
217 {
218         tcf_unregister_action(&act_gact_ops);
219 }
220
221 module_init(gact_init_module);
222 module_exit(gact_cleanup_module);