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Commit | Line | Data |
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1da177e4 | 1 | /* |
0c6965dd | 2 | * net/sched/act_gact.c Generic actions |
1da177e4 LT |
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 | * copyright Jamal Hadi Salim (2002-4) | |
10 | * | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/types.h> |
14 | #include <linux/kernel.h> | |
1da177e4 | 15 | #include <linux/string.h> |
1da177e4 | 16 | #include <linux/errno.h> |
1da177e4 LT |
17 | #include <linux/skbuff.h> |
18 | #include <linux/rtnetlink.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
dc5fc579 | 21 | #include <net/netlink.h> |
1da177e4 LT |
22 | #include <net/pkt_sched.h> |
23 | #include <linux/tc_act/tc_gact.h> | |
24 | #include <net/tc_act/tc_gact.h> | |
25 | ||
c7d03a00 | 26 | static unsigned int gact_net_id; |
a85a970a | 27 | static struct tc_action_ops act_gact_ops; |
ddf97ccd | 28 | |
1da177e4 | 29 | #ifdef CONFIG_GACT_PROB |
e9ce1cd3 | 30 | static int gact_net_rand(struct tcf_gact *gact) |
1da177e4 | 31 | { |
cef5ecf9 ED |
32 | smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */ |
33 | if (prandom_u32() % gact->tcfg_pval) | |
e9ce1cd3 DM |
34 | return gact->tcf_action; |
35 | return gact->tcfg_paction; | |
1da177e4 LT |
36 | } |
37 | ||
e9ce1cd3 | 38 | static int gact_determ(struct tcf_gact *gact) |
1da177e4 | 39 | { |
cc6510a9 ED |
40 | u32 pack = atomic_inc_return(&gact->packets); |
41 | ||
cef5ecf9 | 42 | smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */ |
cc6510a9 | 43 | if (pack % gact->tcfg_pval) |
e9ce1cd3 DM |
44 | return gact->tcf_action; |
45 | return gact->tcfg_paction; | |
1da177e4 LT |
46 | } |
47 | ||
e9ce1cd3 | 48 | typedef int (*g_rand)(struct tcf_gact *gact); |
cc7ec456 | 49 | static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ }; |
e9ce1cd3 | 50 | #endif /* CONFIG_GACT_PROB */ |
1da177e4 | 51 | |
53b2bf3f PM |
52 | static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = { |
53 | [TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) }, | |
54 | [TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) }, | |
55 | }; | |
56 | ||
c1b52739 | 57 | static int tcf_gact_init(struct net *net, struct nlattr *nla, |
a85a970a | 58 | struct nlattr *est, struct tc_action **a, |
789871bb VB |
59 | int ovr, int bind, bool rtnl_held, |
60 | struct netlink_ext_ack *extack) | |
1da177e4 | 61 | { |
ddf97ccd | 62 | struct tc_action_net *tn = net_generic(net, gact_net_id); |
7ba699c6 | 63 | struct nlattr *tb[TCA_GACT_MAX + 1]; |
1da177e4 | 64 | struct tc_gact *parm; |
e9ce1cd3 | 65 | struct tcf_gact *gact; |
1da177e4 | 66 | int ret = 0; |
cee63723 | 67 | int err; |
696ecdc1 HS |
68 | #ifdef CONFIG_GACT_PROB |
69 | struct tc_gact_p *p_parm = NULL; | |
70 | #endif | |
1da177e4 | 71 | |
cee63723 | 72 | if (nla == NULL) |
1da177e4 LT |
73 | return -EINVAL; |
74 | ||
fceb6435 | 75 | err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy, NULL); |
cee63723 PM |
76 | if (err < 0) |
77 | return err; | |
78 | ||
53b2bf3f | 79 | if (tb[TCA_GACT_PARMS] == NULL) |
1da177e4 | 80 | return -EINVAL; |
7ba699c6 | 81 | parm = nla_data(tb[TCA_GACT_PARMS]); |
1da177e4 | 82 | |
53b2bf3f | 83 | #ifndef CONFIG_GACT_PROB |
7ba699c6 | 84 | if (tb[TCA_GACT_PROB] != NULL) |
1da177e4 | 85 | return -EOPNOTSUPP; |
696ecdc1 HS |
86 | #else |
87 | if (tb[TCA_GACT_PROB]) { | |
88 | p_parm = nla_data(tb[TCA_GACT_PROB]); | |
89 | if (p_parm->ptype >= MAX_RAND) | |
90 | return -EINVAL; | |
91 | } | |
1da177e4 LT |
92 | #endif |
93 | ||
0190c1d4 VB |
94 | err = tcf_idr_check_alloc(tn, &parm->index, a, bind); |
95 | if (!err) { | |
65a206c0 CM |
96 | ret = tcf_idr_create(tn, parm->index, est, a, |
97 | &act_gact_ops, bind, true); | |
0190c1d4 VB |
98 | if (ret) { |
99 | tcf_idr_cleanup(tn, parm->index); | |
86062033 | 100 | return ret; |
0190c1d4 | 101 | } |
1da177e4 | 102 | ret = ACT_P_CREATED; |
0190c1d4 | 103 | } else if (err > 0) { |
1a29321e JHS |
104 | if (bind)/* dont override defaults */ |
105 | return 0; | |
4e8ddd7f VB |
106 | if (!ovr) { |
107 | tcf_idr_release(*a, bind); | |
1da177e4 | 108 | return -EEXIST; |
4e8ddd7f | 109 | } |
0190c1d4 VB |
110 | } else { |
111 | return err; | |
1da177e4 LT |
112 | } |
113 | ||
a85a970a | 114 | gact = to_gact(*a); |
e9ce1cd3 | 115 | |
653cd284 | 116 | spin_lock_bh(&gact->tcf_lock); |
e9ce1cd3 | 117 | gact->tcf_action = parm->action; |
1da177e4 | 118 | #ifdef CONFIG_GACT_PROB |
696ecdc1 | 119 | if (p_parm) { |
e9ce1cd3 | 120 | gact->tcfg_paction = p_parm->paction; |
cef5ecf9 ED |
121 | gact->tcfg_pval = max_t(u16, 1, p_parm->pval); |
122 | /* Make sure tcfg_pval is written before tcfg_ptype | |
123 | * coupled with smp_rmb() in gact_net_rand() & gact_determ() | |
124 | */ | |
125 | smp_wmb(); | |
e9ce1cd3 | 126 | gact->tcfg_ptype = p_parm->ptype; |
1da177e4 LT |
127 | } |
128 | #endif | |
653cd284 | 129 | spin_unlock_bh(&gact->tcf_lock); |
e8917f43 | 130 | |
1da177e4 | 131 | if (ret == ACT_P_CREATED) |
65a206c0 | 132 | tcf_idr_insert(tn, *a); |
1da177e4 LT |
133 | return ret; |
134 | } | |
135 | ||
1740005e JHS |
136 | static int tcf_gact_act(struct sk_buff *skb, const struct tc_action *a, |
137 | struct tcf_result *res) | |
1da177e4 | 138 | { |
a85a970a | 139 | struct tcf_gact *gact = to_gact(a); |
56e5d1ca | 140 | int action = READ_ONCE(gact->tcf_action); |
1da177e4 | 141 | |
1da177e4 | 142 | #ifdef CONFIG_GACT_PROB |
8f2ae965 ED |
143 | { |
144 | u32 ptype = READ_ONCE(gact->tcfg_ptype); | |
145 | ||
146 | if (ptype) | |
147 | action = gact_rand[ptype](gact); | |
148 | } | |
1da177e4 | 149 | #endif |
56e5d1ca | 150 | bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), skb); |
1da177e4 | 151 | if (action == TC_ACT_SHOT) |
56e5d1ca ED |
152 | qstats_drop_inc(this_cpu_ptr(gact->common.cpu_qstats)); |
153 | ||
154 | tcf_lastuse_update(&gact->tcf_tm); | |
1da177e4 LT |
155 | |
156 | return action; | |
157 | } | |
158 | ||
9fea47d9 AV |
159 | static void tcf_gact_stats_update(struct tc_action *a, u64 bytes, u32 packets, |
160 | u64 lastuse) | |
161 | { | |
a85a970a | 162 | struct tcf_gact *gact = to_gact(a); |
9fea47d9 AV |
163 | int action = READ_ONCE(gact->tcf_action); |
164 | struct tcf_t *tm = &gact->tcf_tm; | |
165 | ||
5a7a5555 JHS |
166 | _bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), bytes, |
167 | packets); | |
9fea47d9 AV |
168 | if (action == TC_ACT_SHOT) |
169 | this_cpu_ptr(gact->common.cpu_qstats)->drops += packets; | |
170 | ||
3bb23421 | 171 | tm->lastuse = max_t(u64, tm->lastuse, lastuse); |
9fea47d9 AV |
172 | } |
173 | ||
0b0f43fe JHS |
174 | static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, |
175 | int bind, int ref) | |
1da177e4 | 176 | { |
27a884dc | 177 | unsigned char *b = skb_tail_pointer(skb); |
a85a970a | 178 | struct tcf_gact *gact = to_gact(a); |
1c40be12 ED |
179 | struct tc_gact opt = { |
180 | .index = gact->tcf_index, | |
036bb443 VB |
181 | .refcnt = refcount_read(&gact->tcf_refcnt) - ref, |
182 | .bindcnt = atomic_read(&gact->tcf_bindcnt) - bind, | |
1c40be12 | 183 | }; |
1da177e4 LT |
184 | struct tcf_t t; |
185 | ||
653cd284 | 186 | spin_lock_bh(&gact->tcf_lock); |
e8917f43 | 187 | opt.action = gact->tcf_action; |
1b34ec43 DM |
188 | if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt)) |
189 | goto nla_put_failure; | |
1da177e4 | 190 | #ifdef CONFIG_GACT_PROB |
e9ce1cd3 | 191 | if (gact->tcfg_ptype) { |
1c40be12 ED |
192 | struct tc_gact_p p_opt = { |
193 | .paction = gact->tcfg_paction, | |
194 | .pval = gact->tcfg_pval, | |
195 | .ptype = gact->tcfg_ptype, | |
196 | }; | |
197 | ||
1b34ec43 DM |
198 | if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt)) |
199 | goto nla_put_failure; | |
1da177e4 LT |
200 | } |
201 | #endif | |
48d8ee16 | 202 | tcf_tm_dump(&t, &gact->tcf_tm); |
9854518e | 203 | if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD)) |
1b34ec43 | 204 | goto nla_put_failure; |
653cd284 | 205 | spin_unlock_bh(&gact->tcf_lock); |
e8917f43 | 206 | |
1da177e4 LT |
207 | return skb->len; |
208 | ||
7ba699c6 | 209 | nla_put_failure: |
653cd284 | 210 | spin_unlock_bh(&gact->tcf_lock); |
dc5fc579 | 211 | nlmsg_trim(skb, b); |
1da177e4 LT |
212 | return -1; |
213 | } | |
214 | ||
ddf97ccd WC |
215 | static int tcf_gact_walker(struct net *net, struct sk_buff *skb, |
216 | struct netlink_callback *cb, int type, | |
41780105 AA |
217 | const struct tc_action_ops *ops, |
218 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
219 | { |
220 | struct tc_action_net *tn = net_generic(net, gact_net_id); | |
221 | ||
b3620145 | 222 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ddf97ccd WC |
223 | } |
224 | ||
f061b48c | 225 | static int tcf_gact_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
226 | { |
227 | struct tc_action_net *tn = net_generic(net, gact_net_id); | |
228 | ||
65a206c0 | 229 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
230 | } |
231 | ||
9c5c9c57 RM |
232 | static size_t tcf_gact_get_fill_size(const struct tc_action *act) |
233 | { | |
234 | size_t sz = nla_total_size(sizeof(struct tc_gact)); /* TCA_GACT_PARMS */ | |
235 | ||
236 | #ifdef CONFIG_GACT_PROB | |
237 | if (to_gact(act)->tcfg_ptype) | |
238 | /* TCA_GACT_PROB */ | |
239 | sz += nla_total_size(sizeof(struct tc_gact_p)); | |
240 | #endif | |
241 | ||
242 | return sz; | |
243 | } | |
244 | ||
1da177e4 LT |
245 | static struct tc_action_ops act_gact_ops = { |
246 | .kind = "gact", | |
247 | .type = TCA_ACT_GACT, | |
1da177e4 | 248 | .owner = THIS_MODULE, |
1740005e | 249 | .act = tcf_gact_act, |
9fea47d9 | 250 | .stats_update = tcf_gact_stats_update, |
1da177e4 | 251 | .dump = tcf_gact_dump, |
1da177e4 | 252 | .init = tcf_gact_init, |
ddf97ccd WC |
253 | .walk = tcf_gact_walker, |
254 | .lookup = tcf_gact_search, | |
9c5c9c57 | 255 | .get_fill_size = tcf_gact_get_fill_size, |
a85a970a | 256 | .size = sizeof(struct tcf_gact), |
ddf97ccd WC |
257 | }; |
258 | ||
259 | static __net_init int gact_init_net(struct net *net) | |
260 | { | |
261 | struct tc_action_net *tn = net_generic(net, gact_net_id); | |
262 | ||
c7e460ce | 263 | return tc_action_net_init(tn, &act_gact_ops); |
ddf97ccd WC |
264 | } |
265 | ||
039af9c6 | 266 | static void __net_exit gact_exit_net(struct list_head *net_list) |
ddf97ccd | 267 | { |
039af9c6 | 268 | tc_action_net_exit(net_list, gact_net_id); |
ddf97ccd WC |
269 | } |
270 | ||
271 | static struct pernet_operations gact_net_ops = { | |
272 | .init = gact_init_net, | |
039af9c6 | 273 | .exit_batch = gact_exit_net, |
ddf97ccd WC |
274 | .id = &gact_net_id, |
275 | .size = sizeof(struct tc_action_net), | |
1da177e4 LT |
276 | }; |
277 | ||
278 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); | |
279 | MODULE_DESCRIPTION("Generic Classifier actions"); | |
280 | MODULE_LICENSE("GPL"); | |
281 | ||
e9ce1cd3 | 282 | static int __init gact_init_module(void) |
1da177e4 LT |
283 | { |
284 | #ifdef CONFIG_GACT_PROB | |
cc7ec456 | 285 | pr_info("GACT probability on\n"); |
1da177e4 | 286 | #else |
cc7ec456 | 287 | pr_info("GACT probability NOT on\n"); |
1da177e4 | 288 | #endif |
ddf97ccd WC |
289 | |
290 | return tcf_register_action(&act_gact_ops, &gact_net_ops); | |
1da177e4 LT |
291 | } |
292 | ||
e9ce1cd3 | 293 | static void __exit gact_cleanup_module(void) |
1da177e4 | 294 | { |
ddf97ccd | 295 | tcf_unregister_action(&act_gact_ops, &gact_net_ops); |
1da177e4 LT |
296 | } |
297 | ||
298 | module_init(gact_init_module); | |
299 | module_exit(gact_cleanup_module); |