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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 | 20 | #include <net/pkt_sched.h> |
4b006b0c | 21 | #include <net/pkt_cls.h> |
db753079 | 22 | |
db753079 JHS |
23 | #include <linux/tc_act/tc_defact.h> |
24 | #include <net/tc_act/tc_defact.h> | |
25 | ||
c7d03a00 | 26 | static unsigned int simp_net_id; |
a85a970a | 27 | static struct tc_action_ops act_simp_ops; |
ddf97ccd | 28 | |
fa1b1cff | 29 | #define SIMP_MAX_DATA 32 |
798de374 JHS |
30 | static int tcf_simp_act(struct sk_buff *skb, const struct tc_action *a, |
31 | struct tcf_result *res) | |
db753079 | 32 | { |
a85a970a | 33 | struct tcf_defact *d = to_defact(a); |
db753079 | 34 | |
e9ce1cd3 | 35 | spin_lock(&d->tcf_lock); |
9c4a4e48 | 36 | tcf_lastuse_update(&d->tcf_tm); |
bfe0d029 | 37 | bstats_update(&d->tcf_bstats, skb); |
db753079 | 38 | |
10297b99 YH |
39 | /* print policy string followed by _ then packet count |
40 | * Example if this was the 3rd packet and the string was "hello" | |
41 | * then it would look like "hello_3" (without quotes) | |
cc7ec456 | 42 | */ |
6ff9c364 | 43 | pr_info("simple: %s_%d\n", |
e9ce1cd3 DM |
44 | (char *)d->tcfd_defdata, d->tcf_bstats.packets); |
45 | spin_unlock(&d->tcf_lock); | |
46 | return d->tcf_action; | |
47 | } | |
48 | ||
9a63b255 | 49 | static void tcf_simp_release(struct tc_action *a) |
e9ce1cd3 | 50 | { |
86062033 | 51 | struct tcf_defact *d = to_defact(a); |
a5b5c958 | 52 | kfree(d->tcfd_defdata); |
e9ce1cd3 DM |
53 | } |
54 | ||
8d499533 | 55 | static int alloc_defdata(struct tcf_defact *d, const struct nlattr *defdata) |
e9ce1cd3 | 56 | { |
0eff683f | 57 | d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL); |
e9ce1cd3 DM |
58 | if (unlikely(!d->tcfd_defdata)) |
59 | return -ENOMEM; | |
8d499533 | 60 | nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); |
e9ce1cd3 DM |
61 | return 0; |
62 | } | |
63 | ||
4b006b0c DC |
64 | static int reset_policy(struct tc_action *a, const struct nlattr *defdata, |
65 | struct tc_defact *p, struct tcf_proto *tp, | |
66 | struct netlink_ext_ack *extack) | |
e9ce1cd3 | 67 | { |
4b006b0c DC |
68 | struct tcf_chain *goto_ch = NULL; |
69 | struct tcf_defact *d; | |
70 | int err; | |
71 | ||
72 | err = tcf_action_check_ctrlact(p->action, tp, &goto_ch, extack); | |
73 | if (err < 0) | |
74 | return err; | |
75 | d = to_defact(a); | |
9d1045ad | 76 | spin_lock_bh(&d->tcf_lock); |
4b006b0c | 77 | goto_ch = tcf_action_set_ctrlact(a, p->action, goto_ch); |
9d1045ad | 78 | memset(d->tcfd_defdata, 0, SIMP_MAX_DATA); |
8d499533 | 79 | nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); |
9d1045ad | 80 | spin_unlock_bh(&d->tcf_lock); |
4b006b0c DC |
81 | if (goto_ch) |
82 | tcf_chain_put_by_act(goto_ch); | |
83 | return 0; | |
e9ce1cd3 DM |
84 | } |
85 | ||
53b2bf3f PM |
86 | static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = { |
87 | [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) }, | |
fa1b1cff | 88 | [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA }, |
53b2bf3f PM |
89 | }; |
90 | ||
c1b52739 | 91 | static int tcf_simp_init(struct net *net, struct nlattr *nla, |
a85a970a | 92 | struct nlattr *est, struct tc_action **a, |
789871bb | 93 | int ovr, int bind, bool rtnl_held, |
85d0966f | 94 | struct tcf_proto *tp, struct netlink_ext_ack *extack) |
e9ce1cd3 | 95 | { |
ddf97ccd | 96 | struct tc_action_net *tn = net_generic(net, simp_net_id); |
7ba699c6 | 97 | struct nlattr *tb[TCA_DEF_MAX + 1]; |
4b006b0c | 98 | struct tcf_chain *goto_ch = NULL; |
e9ce1cd3 DM |
99 | struct tc_defact *parm; |
100 | struct tcf_defact *d; | |
b2313077 WC |
101 | bool exists = false; |
102 | int ret = 0, err; | |
e9ce1cd3 | 103 | |
cee63723 | 104 | if (nla == NULL) |
e9ce1cd3 DM |
105 | return -EINVAL; |
106 | ||
fceb6435 | 107 | err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy, NULL); |
cee63723 PM |
108 | if (err < 0) |
109 | return err; | |
110 | ||
53b2bf3f | 111 | if (tb[TCA_DEF_PARMS] == NULL) |
e9ce1cd3 DM |
112 | return -EINVAL; |
113 | ||
fa1b1cff | 114 | parm = nla_data(tb[TCA_DEF_PARMS]); |
0190c1d4 VB |
115 | err = tcf_idr_check_alloc(tn, &parm->index, a, bind); |
116 | if (err < 0) | |
117 | return err; | |
118 | exists = err; | |
0e5538ab JHS |
119 | if (exists && bind) |
120 | return 0; | |
121 | ||
122 | if (tb[TCA_DEF_DATA] == NULL) { | |
123 | if (exists) | |
65a206c0 | 124 | tcf_idr_release(*a, bind); |
0190c1d4 VB |
125 | else |
126 | tcf_idr_cleanup(tn, parm->index); | |
0e5538ab JHS |
127 | return -EINVAL; |
128 | } | |
129 | ||
0e5538ab | 130 | if (!exists) { |
65a206c0 CM |
131 | ret = tcf_idr_create(tn, parm->index, est, a, |
132 | &act_simp_ops, bind, false); | |
0190c1d4 VB |
133 | if (ret) { |
134 | tcf_idr_cleanup(tn, parm->index); | |
86062033 | 135 | return ret; |
0190c1d4 | 136 | } |
e9ce1cd3 | 137 | |
a85a970a | 138 | d = to_defact(*a); |
4b006b0c DC |
139 | err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, |
140 | extack); | |
141 | if (err < 0) | |
142 | goto release_idr; | |
143 | ||
144 | err = alloc_defdata(d, tb[TCA_DEF_DATA]); | |
145 | if (err < 0) | |
146 | goto put_chain; | |
147 | ||
148 | tcf_action_set_ctrlact(*a, parm->action, goto_ch); | |
e9ce1cd3 DM |
149 | ret = ACT_P_CREATED; |
150 | } else { | |
4e8ddd7f | 151 | if (!ovr) { |
4b006b0c DC |
152 | err = -EEXIST; |
153 | goto release_idr; | |
4e8ddd7f | 154 | } |
1a29321e | 155 | |
4b006b0c DC |
156 | err = reset_policy(*a, tb[TCA_DEF_DATA], parm, tp, extack); |
157 | if (err) | |
158 | goto release_idr; | |
e9ce1cd3 DM |
159 | } |
160 | ||
e9ce1cd3 | 161 | if (ret == ACT_P_CREATED) |
65a206c0 | 162 | tcf_idr_insert(tn, *a); |
e9ce1cd3 | 163 | return ret; |
4b006b0c DC |
164 | put_chain: |
165 | if (goto_ch) | |
166 | tcf_chain_put_by_act(goto_ch); | |
167 | release_idr: | |
168 | tcf_idr_release(*a, bind); | |
169 | return err; | |
e9ce1cd3 DM |
170 | } |
171 | ||
cc7ec456 ED |
172 | static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a, |
173 | int bind, int ref) | |
e9ce1cd3 | 174 | { |
27a884dc | 175 | unsigned char *b = skb_tail_pointer(skb); |
a85a970a | 176 | struct tcf_defact *d = to_defact(a); |
1c40be12 ED |
177 | struct tc_defact opt = { |
178 | .index = d->tcf_index, | |
036bb443 VB |
179 | .refcnt = refcount_read(&d->tcf_refcnt) - ref, |
180 | .bindcnt = atomic_read(&d->tcf_bindcnt) - bind, | |
1c40be12 | 181 | }; |
e9ce1cd3 DM |
182 | struct tcf_t t; |
183 | ||
5e48180e VB |
184 | spin_lock_bh(&d->tcf_lock); |
185 | opt.action = d->tcf_action; | |
1b34ec43 DM |
186 | if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) || |
187 | nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata)) | |
188 | goto nla_put_failure; | |
48d8ee16 JHS |
189 | |
190 | tcf_tm_dump(&t, &d->tcf_tm); | |
9854518e | 191 | if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD)) |
1b34ec43 | 192 | goto nla_put_failure; |
5e48180e VB |
193 | spin_unlock_bh(&d->tcf_lock); |
194 | ||
e9ce1cd3 DM |
195 | return skb->len; |
196 | ||
7ba699c6 | 197 | nla_put_failure: |
5e48180e | 198 | spin_unlock_bh(&d->tcf_lock); |
dc5fc579 | 199 | nlmsg_trim(skb, b); |
e9ce1cd3 | 200 | return -1; |
db753079 JHS |
201 | } |
202 | ||
ddf97ccd WC |
203 | static int tcf_simp_walker(struct net *net, struct sk_buff *skb, |
204 | struct netlink_callback *cb, int type, | |
41780105 AA |
205 | const struct tc_action_ops *ops, |
206 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
207 | { |
208 | struct tc_action_net *tn = net_generic(net, simp_net_id); | |
209 | ||
b3620145 | 210 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ddf97ccd WC |
211 | } |
212 | ||
f061b48c | 213 | static int tcf_simp_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
214 | { |
215 | struct tc_action_net *tn = net_generic(net, simp_net_id); | |
216 | ||
65a206c0 | 217 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
218 | } |
219 | ||
db753079 | 220 | static struct tc_action_ops act_simp_ops = { |
e9ce1cd3 | 221 | .kind = "simple", |
eddd2cf1 | 222 | .id = TCA_ID_SIMP, |
e9ce1cd3 | 223 | .owner = THIS_MODULE, |
798de374 | 224 | .act = tcf_simp_act, |
e9ce1cd3 | 225 | .dump = tcf_simp_dump, |
86062033 | 226 | .cleanup = tcf_simp_release, |
e9ce1cd3 | 227 | .init = tcf_simp_init, |
ddf97ccd WC |
228 | .walk = tcf_simp_walker, |
229 | .lookup = tcf_simp_search, | |
a85a970a | 230 | .size = sizeof(struct tcf_defact), |
ddf97ccd WC |
231 | }; |
232 | ||
233 | static __net_init int simp_init_net(struct net *net) | |
234 | { | |
235 | struct tc_action_net *tn = net_generic(net, simp_net_id); | |
236 | ||
c7e460ce | 237 | return tc_action_net_init(tn, &act_simp_ops); |
ddf97ccd WC |
238 | } |
239 | ||
039af9c6 | 240 | static void __net_exit simp_exit_net(struct list_head *net_list) |
ddf97ccd | 241 | { |
039af9c6 | 242 | tc_action_net_exit(net_list, simp_net_id); |
ddf97ccd WC |
243 | } |
244 | ||
245 | static struct pernet_operations simp_net_ops = { | |
246 | .init = simp_init_net, | |
039af9c6 | 247 | .exit_batch = simp_exit_net, |
ddf97ccd WC |
248 | .id = &simp_net_id, |
249 | .size = sizeof(struct tc_action_net), | |
db753079 JHS |
250 | }; |
251 | ||
252 | MODULE_AUTHOR("Jamal Hadi Salim(2005)"); | |
253 | MODULE_DESCRIPTION("Simple example action"); | |
254 | MODULE_LICENSE("GPL"); | |
255 | ||
256 | static int __init simp_init_module(void) | |
257 | { | |
ddf97ccd | 258 | int ret = tcf_register_action(&act_simp_ops, &simp_net_ops); |
db753079 | 259 | if (!ret) |
6ff9c364 | 260 | pr_info("Simple TC action Loaded\n"); |
db753079 JHS |
261 | return ret; |
262 | } | |
263 | ||
264 | static void __exit simp_cleanup_module(void) | |
265 | { | |
ddf97ccd | 266 | tcf_unregister_action(&act_simp_ops, &simp_net_ops); |
db753079 JHS |
267 | } |
268 | ||
269 | module_init(simp_init_module); | |
270 | module_exit(simp_cleanup_module); |