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db753079 JHS |
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 | * | |
fa1b1cff | 9 | * Authors: Jamal Hadi Salim (2005-8) |
db753079 JHS |
10 | * |
11 | */ | |
12 | ||
cbdbf00a | 13 | #include <linux/module.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
cbdbf00a | 15 | #include <linux/init.h> |
db753079 | 16 | #include <linux/kernel.h> |
db753079 JHS |
17 | #include <linux/skbuff.h> |
18 | #include <linux/rtnetlink.h> | |
dc5fc579 | 19 | #include <net/netlink.h> |
db753079 JHS |
20 | #include <net/pkt_sched.h> |
21 | ||
22 | #define TCA_ACT_SIMP 22 | |
23 | ||
db753079 JHS |
24 | #include <linux/tc_act/tc_defact.h> |
25 | #include <net/tc_act/tc_defact.h> | |
26 | ||
e9ce1cd3 DM |
27 | #define SIMP_TAB_MASK 7 |
28 | static struct tcf_common *tcf_simp_ht[SIMP_TAB_MASK + 1]; | |
29 | static u32 simp_idx_gen; | |
db753079 JHS |
30 | static DEFINE_RWLOCK(simp_lock); |
31 | ||
28a7b327 | 32 | static struct tcf_hashinfo simp_hash_info = { |
e9ce1cd3 DM |
33 | .htab = tcf_simp_ht, |
34 | .hmask = SIMP_TAB_MASK, | |
35 | .lock = &simp_lock, | |
36 | }; | |
db753079 | 37 | |
fa1b1cff | 38 | #define SIMP_MAX_DATA 32 |
dc7f9f6e ED |
39 | static int tcf_simp(struct sk_buff *skb, const struct tc_action *a, |
40 | struct tcf_result *res) | |
db753079 | 41 | { |
e9ce1cd3 | 42 | struct tcf_defact *d = a->priv; |
db753079 | 43 | |
e9ce1cd3 DM |
44 | spin_lock(&d->tcf_lock); |
45 | d->tcf_tm.lastuse = jiffies; | |
bfe0d029 | 46 | bstats_update(&d->tcf_bstats, skb); |
db753079 | 47 | |
10297b99 YH |
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) | |
cc7ec456 | 51 | */ |
6ff9c364 | 52 | pr_info("simple: %s_%d\n", |
e9ce1cd3 DM |
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 | ||
fa1b1cff | 74 | static int alloc_defdata(struct tcf_defact *d, char *defdata) |
e9ce1cd3 | 75 | { |
0eff683f | 76 | d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL); |
e9ce1cd3 DM |
77 | if (unlikely(!d->tcfd_defdata)) |
78 | return -ENOMEM; | |
0eff683f | 79 | strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); |
e9ce1cd3 DM |
80 | return 0; |
81 | } | |
82 | ||
9d1045ad JHS |
83 | static void reset_policy(struct tcf_defact *d, char *defdata, |
84 | struct tc_defact *p) | |
e9ce1cd3 | 85 | { |
9d1045ad JHS |
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); | |
e9ce1cd3 DM |
91 | } |
92 | ||
53b2bf3f PM |
93 | static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = { |
94 | [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) }, | |
fa1b1cff | 95 | [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA }, |
53b2bf3f PM |
96 | }; |
97 | ||
c1b52739 BL |
98 | static int tcf_simp_init(struct net *net, struct nlattr *nla, |
99 | struct nlattr *est, struct tc_action *a, | |
100 | int ovr, int bind) | |
e9ce1cd3 | 101 | { |
7ba699c6 | 102 | struct nlattr *tb[TCA_DEF_MAX + 1]; |
e9ce1cd3 DM |
103 | struct tc_defact *parm; |
104 | struct tcf_defact *d; | |
105 | struct tcf_common *pc; | |
fa1b1cff | 106 | char *defdata; |
cee63723 | 107 | int ret = 0, err; |
e9ce1cd3 | 108 | |
cee63723 | 109 | if (nla == NULL) |
e9ce1cd3 DM |
110 | return -EINVAL; |
111 | ||
fa1b1cff | 112 | err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy); |
cee63723 PM |
113 | if (err < 0) |
114 | return err; | |
115 | ||
53b2bf3f | 116 | if (tb[TCA_DEF_PARMS] == NULL) |
e9ce1cd3 DM |
117 | return -EINVAL; |
118 | ||
fa1b1cff | 119 | if (tb[TCA_DEF_DATA] == NULL) |
e9ce1cd3 DM |
120 | return -EINVAL; |
121 | ||
fa1b1cff JHS |
122 | parm = nla_data(tb[TCA_DEF_PARMS]); |
123 | defdata = nla_data(tb[TCA_DEF_DATA]); | |
e9ce1cd3 DM |
124 | |
125 | pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info); | |
126 | if (!pc) { | |
127 | pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind, | |
128 | &simp_idx_gen, &simp_hash_info); | |
0e991ec6 | 129 | if (IS_ERR(pc)) |
cc7ec456 | 130 | return PTR_ERR(pc); |
e9ce1cd3 DM |
131 | |
132 | d = to_defact(pc); | |
fa1b1cff | 133 | ret = alloc_defdata(d, defdata); |
e9ce1cd3 | 134 | if (ret < 0) { |
47fd92f5 HS |
135 | if (est) |
136 | gen_kill_estimator(&pc->tcfc_bstats, | |
137 | &pc->tcfc_rate_est); | |
138 | kfree_rcu(pc, tcfc_rcu); | |
e9ce1cd3 DM |
139 | return ret; |
140 | } | |
9d1045ad | 141 | d->tcf_action = parm->action; |
e9ce1cd3 DM |
142 | ret = ACT_P_CREATED; |
143 | } else { | |
144 | d = to_defact(pc); | |
145 | if (!ovr) { | |
146 | tcf_simp_release(d, bind); | |
147 | return -EEXIST; | |
148 | } | |
9d1045ad | 149 | reset_policy(d, defdata, parm); |
e9ce1cd3 DM |
150 | } |
151 | ||
e9ce1cd3 DM |
152 | if (ret == ACT_P_CREATED) |
153 | tcf_hash_insert(pc, &simp_hash_info); | |
154 | return ret; | |
155 | } | |
156 | ||
cc7ec456 | 157 | static int tcf_simp_cleanup(struct tc_action *a, int bind) |
e9ce1cd3 DM |
158 | { |
159 | struct tcf_defact *d = a->priv; | |
160 | ||
161 | if (d) | |
162 | return tcf_simp_release(d, bind); | |
163 | return 0; | |
164 | } | |
165 | ||
cc7ec456 ED |
166 | static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a, |
167 | int bind, int ref) | |
e9ce1cd3 | 168 | { |
27a884dc | 169 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 170 | struct tcf_defact *d = a->priv; |
1c40be12 ED |
171 | struct tc_defact opt = { |
172 | .index = d->tcf_index, | |
173 | .refcnt = d->tcf_refcnt - ref, | |
174 | .bindcnt = d->tcf_bindcnt - bind, | |
175 | .action = d->tcf_action, | |
176 | }; | |
e9ce1cd3 DM |
177 | struct tcf_t t; |
178 | ||
1b34ec43 DM |
179 | if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) || |
180 | nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata)) | |
181 | goto nla_put_failure; | |
e9ce1cd3 DM |
182 | t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install); |
183 | t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse); | |
184 | t.expires = jiffies_to_clock_t(d->tcf_tm.expires); | |
1b34ec43 DM |
185 | if (nla_put(skb, TCA_DEF_TM, sizeof(t), &t)) |
186 | goto nla_put_failure; | |
e9ce1cd3 DM |
187 | return skb->len; |
188 | ||
7ba699c6 | 189 | nla_put_failure: |
dc5fc579 | 190 | nlmsg_trim(skb, b); |
e9ce1cd3 | 191 | return -1; |
db753079 JHS |
192 | } |
193 | ||
194 | static struct tc_action_ops act_simp_ops = { | |
e9ce1cd3 DM |
195 | .kind = "simple", |
196 | .hinfo = &simp_hash_info, | |
197 | .type = TCA_ACT_SIMP, | |
198 | .capab = TCA_CAP_NONE, | |
199 | .owner = THIS_MODULE, | |
200 | .act = tcf_simp, | |
201 | .dump = tcf_simp_dump, | |
202 | .cleanup = tcf_simp_cleanup, | |
203 | .init = tcf_simp_init, | |
db753079 JHS |
204 | }; |
205 | ||
206 | MODULE_AUTHOR("Jamal Hadi Salim(2005)"); | |
207 | MODULE_DESCRIPTION("Simple example action"); | |
208 | MODULE_LICENSE("GPL"); | |
209 | ||
210 | static int __init simp_init_module(void) | |
211 | { | |
212 | int ret = tcf_register_action(&act_simp_ops); | |
213 | if (!ret) | |
6ff9c364 | 214 | pr_info("Simple TC action Loaded\n"); |
db753079 JHS |
215 | return ret; |
216 | } | |
217 | ||
218 | static void __exit simp_cleanup_module(void) | |
219 | { | |
220 | tcf_unregister_action(&act_simp_ops); | |
221 | } | |
222 | ||
223 | module_init(simp_init_module); | |
224 | module_exit(simp_cleanup_module); |