Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux/fpc-iii.git] / net / sched / act_simple.c
blob901571a677072c8480b270df13f7d01c173a070c
1 /*
2 * net/sched/simp.c Simple example of an action
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.
9 * Authors: Jamal Hadi Salim (2005)
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/netdevice.h>
17 #include <linux/skbuff.h>
18 #include <linux/rtnetlink.h>
19 #include <net/pkt_sched.h>
21 #define TCA_ACT_SIMP 22
23 #include <linux/tc_act/tc_defact.h>
24 #include <net/tc_act/tc_defact.h>
26 #define SIMP_TAB_MASK 7
27 static struct tcf_common *tcf_simp_ht[SIMP_TAB_MASK + 1];
28 static u32 simp_idx_gen;
29 static DEFINE_RWLOCK(simp_lock);
31 static struct tcf_hashinfo simp_hash_info = {
32 .htab = tcf_simp_ht,
33 .hmask = SIMP_TAB_MASK,
34 .lock = &simp_lock,
37 static int tcf_simp(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)
39 struct tcf_defact *d = a->priv;
41 spin_lock(&d->tcf_lock);
42 d->tcf_tm.lastuse = jiffies;
43 d->tcf_bstats.bytes += skb->len;
44 d->tcf_bstats.packets++;
46 /* print policy string followed by _ then packet count
47 * Example if this was the 3rd packet and the string was "hello"
48 * then it would look like "hello_3" (without quotes)
49 **/
50 printk("simple: %s_%d\n",
51 (char *)d->tcfd_defdata, d->tcf_bstats.packets);
52 spin_unlock(&d->tcf_lock);
53 return d->tcf_action;
56 static int tcf_simp_release(struct tcf_defact *d, int bind)
58 int ret = 0;
59 if (d) {
60 if (bind)
61 d->tcf_bindcnt--;
62 d->tcf_refcnt--;
63 if (d->tcf_bindcnt <= 0 && d->tcf_refcnt <= 0) {
64 kfree(d->tcfd_defdata);
65 tcf_hash_destroy(&d->common, &simp_hash_info);
66 ret = 1;
69 return ret;
72 static int alloc_defdata(struct tcf_defact *d, u32 datalen, void *defdata)
74 d->tcfd_defdata = kmalloc(datalen, GFP_KERNEL);
75 if (unlikely(!d->tcfd_defdata))
76 return -ENOMEM;
77 d->tcfd_datalen = datalen;
78 memcpy(d->tcfd_defdata, defdata, datalen);
79 return 0;
82 static int realloc_defdata(struct tcf_defact *d, u32 datalen, void *defdata)
84 kfree(d->tcfd_defdata);
85 return alloc_defdata(d, datalen, defdata);
88 static int tcf_simp_init(struct rtattr *rta, struct rtattr *est,
89 struct tc_action *a, int ovr, int bind)
91 struct rtattr *tb[TCA_DEF_MAX];
92 struct tc_defact *parm;
93 struct tcf_defact *d;
94 struct tcf_common *pc;
95 void *defdata;
96 u32 datalen = 0;
97 int ret = 0;
99 if (rta == NULL || rtattr_parse_nested(tb, TCA_DEF_MAX, rta) < 0)
100 return -EINVAL;
102 if (tb[TCA_DEF_PARMS - 1] == NULL ||
103 RTA_PAYLOAD(tb[TCA_DEF_PARMS - 1]) < sizeof(*parm))
104 return -EINVAL;
106 parm = RTA_DATA(tb[TCA_DEF_PARMS - 1]);
107 defdata = RTA_DATA(tb[TCA_DEF_DATA - 1]);
108 if (defdata == NULL)
109 return -EINVAL;
111 datalen = RTA_PAYLOAD(tb[TCA_DEF_DATA - 1]);
112 if (datalen <= 0)
113 return -EINVAL;
115 pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info);
116 if (!pc) {
117 pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind,
118 &simp_idx_gen, &simp_hash_info);
119 if (unlikely(!pc))
120 return -ENOMEM;
122 d = to_defact(pc);
123 ret = alloc_defdata(d, datalen, defdata);
124 if (ret < 0) {
125 kfree(pc);
126 return ret;
128 ret = ACT_P_CREATED;
129 } else {
130 d = to_defact(pc);
131 if (!ovr) {
132 tcf_simp_release(d, bind);
133 return -EEXIST;
135 realloc_defdata(d, datalen, defdata);
138 spin_lock_bh(&d->tcf_lock);
139 d->tcf_action = parm->action;
140 spin_unlock_bh(&d->tcf_lock);
142 if (ret == ACT_P_CREATED)
143 tcf_hash_insert(pc, &simp_hash_info);
144 return ret;
147 static inline int tcf_simp_cleanup(struct tc_action *a, int bind)
149 struct tcf_defact *d = a->priv;
151 if (d)
152 return tcf_simp_release(d, bind);
153 return 0;
156 static inline int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
157 int bind, int ref)
159 unsigned char *b = skb->tail;
160 struct tcf_defact *d = a->priv;
161 struct tc_defact opt;
162 struct tcf_t t;
164 opt.index = d->tcf_index;
165 opt.refcnt = d->tcf_refcnt - ref;
166 opt.bindcnt = d->tcf_bindcnt - bind;
167 opt.action = d->tcf_action;
168 RTA_PUT(skb, TCA_DEF_PARMS, sizeof(opt), &opt);
169 RTA_PUT(skb, TCA_DEF_DATA, d->tcfd_datalen, d->tcfd_defdata);
170 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
171 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
172 t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
173 RTA_PUT(skb, TCA_DEF_TM, sizeof(t), &t);
174 return skb->len;
176 rtattr_failure:
177 skb_trim(skb, b - skb->data);
178 return -1;
181 static struct tc_action_ops act_simp_ops = {
182 .kind = "simple",
183 .hinfo = &simp_hash_info,
184 .type = TCA_ACT_SIMP,
185 .capab = TCA_CAP_NONE,
186 .owner = THIS_MODULE,
187 .act = tcf_simp,
188 .dump = tcf_simp_dump,
189 .cleanup = tcf_simp_cleanup,
190 .init = tcf_simp_init,
191 .walk = tcf_generic_walker,
194 MODULE_AUTHOR("Jamal Hadi Salim(2005)");
195 MODULE_DESCRIPTION("Simple example action");
196 MODULE_LICENSE("GPL");
198 static int __init simp_init_module(void)
200 int ret = tcf_register_action(&act_simp_ops);
201 if (!ret)
202 printk("Simple TC action Loaded\n");
203 return ret;
206 static void __exit simp_cleanup_module(void)
208 tcf_unregister_action(&act_simp_ops);
211 module_init(simp_init_module);
212 module_exit(simp_cleanup_module);