Commit | Line | Data |
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db753079 | 1 | /* |
0c6965dd | 2 | * net/sched/act_simple.c Simple example of an action |
db753079 JHS |
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 | 27 | #define SIMP_TAB_MASK 7 |
db753079 | 28 | |
ddf97ccd WC |
29 | static int simp_net_id; |
30 | ||
fa1b1cff | 31 | #define SIMP_MAX_DATA 32 |
dc7f9f6e ED |
32 | static int tcf_simp(struct sk_buff *skb, const struct tc_action *a, |
33 | struct tcf_result *res) | |
db753079 | 34 | { |
e9ce1cd3 | 35 | struct tcf_defact *d = a->priv; |
db753079 | 36 | |
e9ce1cd3 DM |
37 | spin_lock(&d->tcf_lock); |
38 | d->tcf_tm.lastuse = jiffies; | |
bfe0d029 | 39 | bstats_update(&d->tcf_bstats, skb); |
db753079 | 40 | |
10297b99 YH |
41 | /* print policy string followed by _ then packet count |
42 | * Example if this was the 3rd packet and the string was "hello" | |
43 | * then it would look like "hello_3" (without quotes) | |
cc7ec456 | 44 | */ |
6ff9c364 | 45 | pr_info("simple: %s_%d\n", |
e9ce1cd3 DM |
46 | (char *)d->tcfd_defdata, d->tcf_bstats.packets); |
47 | spin_unlock(&d->tcf_lock); | |
48 | return d->tcf_action; | |
49 | } | |
50 | ||
a5b5c958 | 51 | static void tcf_simp_release(struct tc_action *a, int bind) |
e9ce1cd3 | 52 | { |
86062033 | 53 | struct tcf_defact *d = to_defact(a); |
a5b5c958 | 54 | kfree(d->tcfd_defdata); |
e9ce1cd3 DM |
55 | } |
56 | ||
fa1b1cff | 57 | static int alloc_defdata(struct tcf_defact *d, char *defdata) |
e9ce1cd3 | 58 | { |
0eff683f | 59 | d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL); |
e9ce1cd3 DM |
60 | if (unlikely(!d->tcfd_defdata)) |
61 | return -ENOMEM; | |
0eff683f | 62 | strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); |
e9ce1cd3 DM |
63 | return 0; |
64 | } | |
65 | ||
9d1045ad JHS |
66 | static void reset_policy(struct tcf_defact *d, char *defdata, |
67 | struct tc_defact *p) | |
e9ce1cd3 | 68 | { |
9d1045ad JHS |
69 | spin_lock_bh(&d->tcf_lock); |
70 | d->tcf_action = p->action; | |
71 | memset(d->tcfd_defdata, 0, SIMP_MAX_DATA); | |
72 | strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); | |
73 | spin_unlock_bh(&d->tcf_lock); | |
e9ce1cd3 DM |
74 | } |
75 | ||
53b2bf3f PM |
76 | static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = { |
77 | [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) }, | |
fa1b1cff | 78 | [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA }, |
53b2bf3f PM |
79 | }; |
80 | ||
c1b52739 BL |
81 | static int tcf_simp_init(struct net *net, struct nlattr *nla, |
82 | struct nlattr *est, struct tc_action *a, | |
83 | int ovr, int bind) | |
e9ce1cd3 | 84 | { |
ddf97ccd | 85 | struct tc_action_net *tn = net_generic(net, simp_net_id); |
7ba699c6 | 86 | struct nlattr *tb[TCA_DEF_MAX + 1]; |
e9ce1cd3 DM |
87 | struct tc_defact *parm; |
88 | struct tcf_defact *d; | |
fa1b1cff | 89 | char *defdata; |
0e5538ab | 90 | int ret = 0, err, exists = 0; |
e9ce1cd3 | 91 | |
cee63723 | 92 | if (nla == NULL) |
e9ce1cd3 DM |
93 | return -EINVAL; |
94 | ||
fa1b1cff | 95 | err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy); |
cee63723 PM |
96 | if (err < 0) |
97 | return err; | |
98 | ||
53b2bf3f | 99 | if (tb[TCA_DEF_PARMS] == NULL) |
e9ce1cd3 DM |
100 | return -EINVAL; |
101 | ||
e9ce1cd3 | 102 | |
fa1b1cff | 103 | parm = nla_data(tb[TCA_DEF_PARMS]); |
0e5538ab JHS |
104 | exists = tcf_hash_check(tn, parm->index, a, bind); |
105 | if (exists && bind) | |
106 | return 0; | |
107 | ||
108 | if (tb[TCA_DEF_DATA] == NULL) { | |
109 | if (exists) | |
110 | tcf_hash_release(a, bind); | |
111 | return -EINVAL; | |
112 | } | |
113 | ||
fa1b1cff | 114 | defdata = nla_data(tb[TCA_DEF_DATA]); |
e9ce1cd3 | 115 | |
0e5538ab | 116 | if (!exists) { |
ddf97ccd WC |
117 | ret = tcf_hash_create(tn, parm->index, est, a, |
118 | sizeof(*d), bind, false); | |
86062033 WC |
119 | if (ret) |
120 | return ret; | |
e9ce1cd3 | 121 | |
86062033 | 122 | d = to_defact(a); |
fa1b1cff | 123 | ret = alloc_defdata(d, defdata); |
e9ce1cd3 | 124 | if (ret < 0) { |
86062033 | 125 | tcf_hash_cleanup(a, est); |
e9ce1cd3 DM |
126 | return ret; |
127 | } | |
9d1045ad | 128 | d->tcf_action = parm->action; |
e9ce1cd3 DM |
129 | ret = ACT_P_CREATED; |
130 | } else { | |
86062033 | 131 | d = to_defact(a); |
1a29321e | 132 | |
a5b5c958 | 133 | tcf_hash_release(a, bind); |
1a29321e | 134 | if (!ovr) |
e9ce1cd3 | 135 | return -EEXIST; |
1a29321e | 136 | |
9d1045ad | 137 | reset_policy(d, defdata, parm); |
e9ce1cd3 DM |
138 | } |
139 | ||
e9ce1cd3 | 140 | if (ret == ACT_P_CREATED) |
ddf97ccd | 141 | tcf_hash_insert(tn, a); |
e9ce1cd3 DM |
142 | return ret; |
143 | } | |
144 | ||
cc7ec456 ED |
145 | static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a, |
146 | int bind, int ref) | |
e9ce1cd3 | 147 | { |
27a884dc | 148 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 149 | struct tcf_defact *d = a->priv; |
1c40be12 ED |
150 | struct tc_defact opt = { |
151 | .index = d->tcf_index, | |
152 | .refcnt = d->tcf_refcnt - ref, | |
153 | .bindcnt = d->tcf_bindcnt - bind, | |
154 | .action = d->tcf_action, | |
155 | }; | |
e9ce1cd3 DM |
156 | struct tcf_t t; |
157 | ||
1b34ec43 DM |
158 | if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) || |
159 | nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata)) | |
160 | goto nla_put_failure; | |
e9ce1cd3 DM |
161 | t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install); |
162 | t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse); | |
163 | t.expires = jiffies_to_clock_t(d->tcf_tm.expires); | |
1b34ec43 DM |
164 | if (nla_put(skb, TCA_DEF_TM, sizeof(t), &t)) |
165 | goto nla_put_failure; | |
e9ce1cd3 DM |
166 | return skb->len; |
167 | ||
7ba699c6 | 168 | nla_put_failure: |
dc5fc579 | 169 | nlmsg_trim(skb, b); |
e9ce1cd3 | 170 | return -1; |
db753079 JHS |
171 | } |
172 | ||
ddf97ccd WC |
173 | static int tcf_simp_walker(struct net *net, struct sk_buff *skb, |
174 | struct netlink_callback *cb, int type, | |
175 | struct tc_action *a) | |
176 | { | |
177 | struct tc_action_net *tn = net_generic(net, simp_net_id); | |
178 | ||
179 | return tcf_generic_walker(tn, skb, cb, type, a); | |
180 | } | |
181 | ||
182 | static int tcf_simp_search(struct net *net, struct tc_action *a, u32 index) | |
183 | { | |
184 | struct tc_action_net *tn = net_generic(net, simp_net_id); | |
185 | ||
186 | return tcf_hash_search(tn, a, index); | |
187 | } | |
188 | ||
db753079 | 189 | static struct tc_action_ops act_simp_ops = { |
e9ce1cd3 | 190 | .kind = "simple", |
e9ce1cd3 | 191 | .type = TCA_ACT_SIMP, |
e9ce1cd3 DM |
192 | .owner = THIS_MODULE, |
193 | .act = tcf_simp, | |
194 | .dump = tcf_simp_dump, | |
86062033 | 195 | .cleanup = tcf_simp_release, |
e9ce1cd3 | 196 | .init = tcf_simp_init, |
ddf97ccd WC |
197 | .walk = tcf_simp_walker, |
198 | .lookup = tcf_simp_search, | |
199 | }; | |
200 | ||
201 | static __net_init int simp_init_net(struct net *net) | |
202 | { | |
203 | struct tc_action_net *tn = net_generic(net, simp_net_id); | |
204 | ||
205 | return tc_action_net_init(tn, &act_simp_ops, SIMP_TAB_MASK); | |
206 | } | |
207 | ||
208 | static void __net_exit simp_exit_net(struct net *net) | |
209 | { | |
210 | struct tc_action_net *tn = net_generic(net, simp_net_id); | |
211 | ||
212 | tc_action_net_exit(tn); | |
213 | } | |
214 | ||
215 | static struct pernet_operations simp_net_ops = { | |
216 | .init = simp_init_net, | |
217 | .exit = simp_exit_net, | |
218 | .id = &simp_net_id, | |
219 | .size = sizeof(struct tc_action_net), | |
db753079 JHS |
220 | }; |
221 | ||
222 | MODULE_AUTHOR("Jamal Hadi Salim(2005)"); | |
223 | MODULE_DESCRIPTION("Simple example action"); | |
224 | MODULE_LICENSE("GPL"); | |
225 | ||
226 | static int __init simp_init_module(void) | |
227 | { | |
ddf97ccd | 228 | int ret = tcf_register_action(&act_simp_ops, &simp_net_ops); |
db753079 | 229 | if (!ret) |
6ff9c364 | 230 | pr_info("Simple TC action Loaded\n"); |
db753079 JHS |
231 | return ret; |
232 | } | |
233 | ||
234 | static void __exit simp_cleanup_module(void) | |
235 | { | |
ddf97ccd | 236 | tcf_unregister_action(&act_simp_ops, &simp_net_ops); |
db753079 JHS |
237 | } |
238 | ||
239 | module_init(simp_init_module); | |
240 | module_exit(simp_cleanup_module); |