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 | 29 | static int simp_net_id; |
a85a970a | 30 | static struct tc_action_ops act_simp_ops; |
ddf97ccd | 31 | |
fa1b1cff | 32 | #define SIMP_MAX_DATA 32 |
dc7f9f6e ED |
33 | static int tcf_simp(struct sk_buff *skb, const struct tc_action *a, |
34 | struct tcf_result *res) | |
db753079 | 35 | { |
a85a970a | 36 | struct tcf_defact *d = to_defact(a); |
db753079 | 37 | |
e9ce1cd3 | 38 | spin_lock(&d->tcf_lock); |
9c4a4e48 | 39 | tcf_lastuse_update(&d->tcf_tm); |
bfe0d029 | 40 | bstats_update(&d->tcf_bstats, skb); |
db753079 | 41 | |
10297b99 YH |
42 | /* print policy string followed by _ then packet count |
43 | * Example if this was the 3rd packet and the string was "hello" | |
44 | * then it would look like "hello_3" (without quotes) | |
cc7ec456 | 45 | */ |
6ff9c364 | 46 | pr_info("simple: %s_%d\n", |
e9ce1cd3 DM |
47 | (char *)d->tcfd_defdata, d->tcf_bstats.packets); |
48 | spin_unlock(&d->tcf_lock); | |
49 | return d->tcf_action; | |
50 | } | |
51 | ||
a5b5c958 | 52 | static void tcf_simp_release(struct tc_action *a, int bind) |
e9ce1cd3 | 53 | { |
86062033 | 54 | struct tcf_defact *d = to_defact(a); |
a5b5c958 | 55 | kfree(d->tcfd_defdata); |
e9ce1cd3 DM |
56 | } |
57 | ||
fa1b1cff | 58 | static int alloc_defdata(struct tcf_defact *d, char *defdata) |
e9ce1cd3 | 59 | { |
0eff683f | 60 | d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL); |
e9ce1cd3 DM |
61 | if (unlikely(!d->tcfd_defdata)) |
62 | return -ENOMEM; | |
0eff683f | 63 | strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); |
e9ce1cd3 DM |
64 | return 0; |
65 | } | |
66 | ||
9d1045ad JHS |
67 | static void reset_policy(struct tcf_defact *d, char *defdata, |
68 | struct tc_defact *p) | |
e9ce1cd3 | 69 | { |
9d1045ad JHS |
70 | spin_lock_bh(&d->tcf_lock); |
71 | d->tcf_action = p->action; | |
72 | memset(d->tcfd_defdata, 0, SIMP_MAX_DATA); | |
73 | strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); | |
74 | spin_unlock_bh(&d->tcf_lock); | |
e9ce1cd3 DM |
75 | } |
76 | ||
53b2bf3f PM |
77 | static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = { |
78 | [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) }, | |
fa1b1cff | 79 | [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA }, |
53b2bf3f PM |
80 | }; |
81 | ||
c1b52739 | 82 | static int tcf_simp_init(struct net *net, struct nlattr *nla, |
a85a970a | 83 | struct nlattr *est, struct tc_action **a, |
c1b52739 | 84 | int ovr, int bind) |
e9ce1cd3 | 85 | { |
ddf97ccd | 86 | struct tc_action_net *tn = net_generic(net, simp_net_id); |
7ba699c6 | 87 | struct nlattr *tb[TCA_DEF_MAX + 1]; |
e9ce1cd3 DM |
88 | struct tc_defact *parm; |
89 | struct tcf_defact *d; | |
b2313077 WC |
90 | bool exists = false; |
91 | int ret = 0, err; | |
fa1b1cff | 92 | char *defdata; |
e9ce1cd3 | 93 | |
cee63723 | 94 | if (nla == NULL) |
e9ce1cd3 DM |
95 | return -EINVAL; |
96 | ||
fa1b1cff | 97 | err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy); |
cee63723 PM |
98 | if (err < 0) |
99 | return err; | |
100 | ||
53b2bf3f | 101 | if (tb[TCA_DEF_PARMS] == NULL) |
e9ce1cd3 DM |
102 | return -EINVAL; |
103 | ||
fa1b1cff | 104 | parm = nla_data(tb[TCA_DEF_PARMS]); |
0e5538ab JHS |
105 | exists = tcf_hash_check(tn, parm->index, a, bind); |
106 | if (exists && bind) | |
107 | return 0; | |
108 | ||
109 | if (tb[TCA_DEF_DATA] == NULL) { | |
110 | if (exists) | |
a85a970a | 111 | tcf_hash_release(*a, bind); |
0e5538ab JHS |
112 | return -EINVAL; |
113 | } | |
114 | ||
fa1b1cff | 115 | defdata = nla_data(tb[TCA_DEF_DATA]); |
e9ce1cd3 | 116 | |
0e5538ab | 117 | if (!exists) { |
ddf97ccd | 118 | ret = tcf_hash_create(tn, parm->index, est, a, |
a85a970a | 119 | &act_simp_ops, bind, false); |
86062033 WC |
120 | if (ret) |
121 | return ret; | |
e9ce1cd3 | 122 | |
a85a970a | 123 | d = to_defact(*a); |
fa1b1cff | 124 | ret = alloc_defdata(d, defdata); |
e9ce1cd3 | 125 | if (ret < 0) { |
a85a970a | 126 | tcf_hash_cleanup(*a, est); |
e9ce1cd3 DM |
127 | return ret; |
128 | } | |
9d1045ad | 129 | d->tcf_action = parm->action; |
e9ce1cd3 DM |
130 | ret = ACT_P_CREATED; |
131 | } else { | |
a85a970a | 132 | d = to_defact(*a); |
1a29321e | 133 | |
a85a970a | 134 | tcf_hash_release(*a, bind); |
1a29321e | 135 | if (!ovr) |
e9ce1cd3 | 136 | return -EEXIST; |
1a29321e | 137 | |
9d1045ad | 138 | reset_policy(d, defdata, parm); |
e9ce1cd3 DM |
139 | } |
140 | ||
e9ce1cd3 | 141 | if (ret == ACT_P_CREATED) |
a85a970a | 142 | tcf_hash_insert(tn, *a); |
e9ce1cd3 DM |
143 | return ret; |
144 | } | |
145 | ||
cc7ec456 ED |
146 | static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a, |
147 | int bind, int ref) | |
e9ce1cd3 | 148 | { |
27a884dc | 149 | unsigned char *b = skb_tail_pointer(skb); |
a85a970a | 150 | struct tcf_defact *d = to_defact(a); |
1c40be12 ED |
151 | struct tc_defact opt = { |
152 | .index = d->tcf_index, | |
153 | .refcnt = d->tcf_refcnt - ref, | |
154 | .bindcnt = d->tcf_bindcnt - bind, | |
155 | .action = d->tcf_action, | |
156 | }; | |
e9ce1cd3 DM |
157 | struct tcf_t t; |
158 | ||
1b34ec43 DM |
159 | if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) || |
160 | nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata)) | |
161 | goto nla_put_failure; | |
48d8ee16 JHS |
162 | |
163 | tcf_tm_dump(&t, &d->tcf_tm); | |
9854518e | 164 | if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD)) |
1b34ec43 | 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, | |
a85a970a | 175 | const struct tc_action_ops *ops) |
ddf97ccd WC |
176 | { |
177 | struct tc_action_net *tn = net_generic(net, simp_net_id); | |
178 | ||
a85a970a | 179 | return tcf_generic_walker(tn, skb, cb, type, ops); |
ddf97ccd WC |
180 | } |
181 | ||
a85a970a | 182 | static int tcf_simp_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
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, | |
a85a970a | 199 | .size = sizeof(struct tcf_defact), |
ddf97ccd WC |
200 | }; |
201 | ||
202 | static __net_init int simp_init_net(struct net *net) | |
203 | { | |
204 | struct tc_action_net *tn = net_generic(net, simp_net_id); | |
205 | ||
206 | return tc_action_net_init(tn, &act_simp_ops, SIMP_TAB_MASK); | |
207 | } | |
208 | ||
209 | static void __net_exit simp_exit_net(struct net *net) | |
210 | { | |
211 | struct tc_action_net *tn = net_generic(net, simp_net_id); | |
212 | ||
213 | tc_action_net_exit(tn); | |
214 | } | |
215 | ||
216 | static struct pernet_operations simp_net_ops = { | |
217 | .init = simp_init_net, | |
218 | .exit = simp_exit_net, | |
219 | .id = &simp_net_id, | |
220 | .size = sizeof(struct tc_action_net), | |
db753079 JHS |
221 | }; |
222 | ||
223 | MODULE_AUTHOR("Jamal Hadi Salim(2005)"); | |
224 | MODULE_DESCRIPTION("Simple example action"); | |
225 | MODULE_LICENSE("GPL"); | |
226 | ||
227 | static int __init simp_init_module(void) | |
228 | { | |
ddf97ccd | 229 | int ret = tcf_register_action(&act_simp_ops, &simp_net_ops); |
db753079 | 230 | if (!ret) |
6ff9c364 | 231 | pr_info("Simple TC action Loaded\n"); |
db753079 JHS |
232 | return ret; |
233 | } | |
234 | ||
235 | static void __exit simp_cleanup_module(void) | |
236 | { | |
ddf97ccd | 237 | tcf_unregister_action(&act_simp_ops, &simp_net_ops); |
db753079 JHS |
238 | } |
239 | ||
240 | module_init(simp_init_module); | |
241 | module_exit(simp_cleanup_module); |