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1 | /* | |
2 | * net/sched/simp.c Simple example of an action | |
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 | * Authors: Jamal Hadi Salim (2005-8) | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/skbuff.h> | |
18 | #include <linux/rtnetlink.h> | |
19 | #include <net/netlink.h> | |
20 | #include <net/pkt_sched.h> | |
21 | ||
22 | #define TCA_ACT_SIMP 22 | |
23 | ||
24 | #include <linux/tc_act/tc_defact.h> | |
25 | #include <net/tc_act/tc_defact.h> | |
26 | ||
27 | #define SIMP_TAB_MASK 7 | |
28 | static struct tcf_common *tcf_simp_ht[SIMP_TAB_MASK + 1]; | |
29 | static u32 simp_idx_gen; | |
30 | static DEFINE_RWLOCK(simp_lock); | |
31 | ||
32 | static struct tcf_hashinfo simp_hash_info = { | |
33 | .htab = tcf_simp_ht, | |
34 | .hmask = SIMP_TAB_MASK, | |
35 | .lock = &simp_lock, | |
36 | }; | |
37 | ||
38 | #define SIMP_MAX_DATA 32 | |
39 | static int tcf_simp(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res) | |
40 | { | |
41 | struct tcf_defact *d = a->priv; | |
42 | ||
43 | spin_lock(&d->tcf_lock); | |
44 | d->tcf_tm.lastuse = jiffies; | |
45 | d->tcf_bstats.bytes += qdisc_pkt_len(skb); | |
46 | d->tcf_bstats.packets++; | |
47 | ||
48 | /* print policy string followed by _ then packet count | |
49 | * Example if this was the 3rd packet and the string was "hello" | |
50 | * then it would look like "hello_3" (without quotes) | |
51 | **/ | |
52 | printk("simple: %s_%d\n", | |
53 | (char *)d->tcfd_defdata, d->tcf_bstats.packets); | |
54 | spin_unlock(&d->tcf_lock); | |
55 | return d->tcf_action; | |
56 | } | |
57 | ||
58 | static int tcf_simp_release(struct tcf_defact *d, int bind) | |
59 | { | |
60 | int ret = 0; | |
61 | if (d) { | |
62 | if (bind) | |
63 | d->tcf_bindcnt--; | |
64 | d->tcf_refcnt--; | |
65 | if (d->tcf_bindcnt <= 0 && d->tcf_refcnt <= 0) { | |
66 | kfree(d->tcfd_defdata); | |
67 | tcf_hash_destroy(&d->common, &simp_hash_info); | |
68 | ret = 1; | |
69 | } | |
70 | } | |
71 | return ret; | |
72 | } | |
73 | ||
74 | static int alloc_defdata(struct tcf_defact *d, char *defdata) | |
75 | { | |
76 | d->tcfd_defdata = kstrndup(defdata, SIMP_MAX_DATA, GFP_KERNEL); | |
77 | if (unlikely(!d->tcfd_defdata)) | |
78 | return -ENOMEM; | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | static void reset_policy(struct tcf_defact *d, char *defdata, | |
84 | struct tc_defact *p) | |
85 | { | |
86 | spin_lock_bh(&d->tcf_lock); | |
87 | d->tcf_action = p->action; | |
88 | memset(d->tcfd_defdata, 0, SIMP_MAX_DATA); | |
89 | strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); | |
90 | spin_unlock_bh(&d->tcf_lock); | |
91 | } | |
92 | ||
93 | static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = { | |
94 | [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) }, | |
95 | [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA }, | |
96 | }; | |
97 | ||
98 | static int tcf_simp_init(struct nlattr *nla, struct nlattr *est, | |
99 | struct tc_action *a, int ovr, int bind) | |
100 | { | |
101 | struct nlattr *tb[TCA_DEF_MAX + 1]; | |
102 | struct tc_defact *parm; | |
103 | struct tcf_defact *d; | |
104 | struct tcf_common *pc; | |
105 | char *defdata; | |
106 | int ret = 0, err; | |
107 | ||
108 | if (nla == NULL) | |
109 | return -EINVAL; | |
110 | ||
111 | err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy); | |
112 | if (err < 0) | |
113 | return err; | |
114 | ||
115 | if (tb[TCA_DEF_PARMS] == NULL) | |
116 | return -EINVAL; | |
117 | ||
118 | if (tb[TCA_DEF_DATA] == NULL) | |
119 | return -EINVAL; | |
120 | ||
121 | parm = nla_data(tb[TCA_DEF_PARMS]); | |
122 | defdata = nla_data(tb[TCA_DEF_DATA]); | |
123 | ||
124 | pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info); | |
125 | if (!pc) { | |
126 | pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind, | |
127 | &simp_idx_gen, &simp_hash_info); | |
128 | if (IS_ERR(pc)) | |
129 | return PTR_ERR(pc); | |
130 | ||
131 | d = to_defact(pc); | |
132 | ret = alloc_defdata(d, defdata); | |
133 | if (ret < 0) { | |
134 | kfree(pc); | |
135 | return ret; | |
136 | } | |
137 | d->tcf_action = parm->action; | |
138 | ret = ACT_P_CREATED; | |
139 | } else { | |
140 | d = to_defact(pc); | |
141 | if (!ovr) { | |
142 | tcf_simp_release(d, bind); | |
143 | return -EEXIST; | |
144 | } | |
145 | reset_policy(d, defdata, parm); | |
146 | } | |
147 | ||
148 | if (ret == ACT_P_CREATED) | |
149 | tcf_hash_insert(pc, &simp_hash_info); | |
150 | return ret; | |
151 | } | |
152 | ||
153 | static inline int tcf_simp_cleanup(struct tc_action *a, int bind) | |
154 | { | |
155 | struct tcf_defact *d = a->priv; | |
156 | ||
157 | if (d) | |
158 | return tcf_simp_release(d, bind); | |
159 | return 0; | |
160 | } | |
161 | ||
162 | static inline int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a, | |
163 | int bind, int ref) | |
164 | { | |
165 | unsigned char *b = skb_tail_pointer(skb); | |
166 | struct tcf_defact *d = a->priv; | |
167 | struct tc_defact opt; | |
168 | struct tcf_t t; | |
169 | ||
170 | opt.index = d->tcf_index; | |
171 | opt.refcnt = d->tcf_refcnt - ref; | |
172 | opt.bindcnt = d->tcf_bindcnt - bind; | |
173 | opt.action = d->tcf_action; | |
174 | NLA_PUT(skb, TCA_DEF_PARMS, sizeof(opt), &opt); | |
175 | NLA_PUT_STRING(skb, TCA_DEF_DATA, d->tcfd_defdata); | |
176 | t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install); | |
177 | t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse); | |
178 | t.expires = jiffies_to_clock_t(d->tcf_tm.expires); | |
179 | NLA_PUT(skb, TCA_DEF_TM, sizeof(t), &t); | |
180 | return skb->len; | |
181 | ||
182 | nla_put_failure: | |
183 | nlmsg_trim(skb, b); | |
184 | return -1; | |
185 | } | |
186 | ||
187 | static struct tc_action_ops act_simp_ops = { | |
188 | .kind = "simple", | |
189 | .hinfo = &simp_hash_info, | |
190 | .type = TCA_ACT_SIMP, | |
191 | .capab = TCA_CAP_NONE, | |
192 | .owner = THIS_MODULE, | |
193 | .act = tcf_simp, | |
194 | .dump = tcf_simp_dump, | |
195 | .cleanup = tcf_simp_cleanup, | |
196 | .init = tcf_simp_init, | |
197 | .walk = tcf_generic_walker, | |
198 | }; | |
199 | ||
200 | MODULE_AUTHOR("Jamal Hadi Salim(2005)"); | |
201 | MODULE_DESCRIPTION("Simple example action"); | |
202 | MODULE_LICENSE("GPL"); | |
203 | ||
204 | static int __init simp_init_module(void) | |
205 | { | |
206 | int ret = tcf_register_action(&act_simp_ops); | |
207 | if (!ret) | |
208 | printk("Simple TC action Loaded\n"); | |
209 | return ret; | |
210 | } | |
211 | ||
212 | static void __exit simp_cleanup_module(void) | |
213 | { | |
214 | tcf_unregister_action(&act_simp_ops); | |
215 | } | |
216 | ||
217 | module_init(simp_init_module); | |
218 | module_exit(simp_cleanup_module); |