Commit | Line | Data |
---|---|---|
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 | ||
e9ce1cd3 | 26 | #define GACT_TAB_MASK 15 |
1da177e4 | 27 | |
ddf97ccd WC |
28 | static int gact_net_id; |
29 | ||
1da177e4 | 30 | #ifdef CONFIG_GACT_PROB |
e9ce1cd3 | 31 | static int gact_net_rand(struct tcf_gact *gact) |
1da177e4 | 32 | { |
cef5ecf9 ED |
33 | smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */ |
34 | if (prandom_u32() % gact->tcfg_pval) | |
e9ce1cd3 DM |
35 | return gact->tcf_action; |
36 | return gact->tcfg_paction; | |
1da177e4 LT |
37 | } |
38 | ||
e9ce1cd3 | 39 | static int gact_determ(struct tcf_gact *gact) |
1da177e4 | 40 | { |
cc6510a9 ED |
41 | u32 pack = atomic_inc_return(&gact->packets); |
42 | ||
cef5ecf9 | 43 | smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */ |
cc6510a9 | 44 | if (pack % gact->tcfg_pval) |
e9ce1cd3 DM |
45 | return gact->tcf_action; |
46 | return gact->tcfg_paction; | |
1da177e4 LT |
47 | } |
48 | ||
e9ce1cd3 | 49 | typedef int (*g_rand)(struct tcf_gact *gact); |
cc7ec456 | 50 | static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ }; |
e9ce1cd3 | 51 | #endif /* CONFIG_GACT_PROB */ |
1da177e4 | 52 | |
53b2bf3f PM |
53 | static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = { |
54 | [TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) }, | |
55 | [TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) }, | |
56 | }; | |
57 | ||
c1b52739 BL |
58 | static int tcf_gact_init(struct net *net, struct nlattr *nla, |
59 | struct nlattr *est, struct tc_action *a, | |
60 | int ovr, int bind) | |
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 | ||
53b2bf3f | 75 | err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy); |
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 | ||
ddf97ccd WC |
94 | if (!tcf_hash_check(tn, parm->index, a, bind)) { |
95 | ret = tcf_hash_create(tn, parm->index, est, a, | |
96 | sizeof(*gact), bind, true); | |
86062033 WC |
97 | if (ret) |
98 | return ret; | |
1da177e4 LT |
99 | ret = ACT_P_CREATED; |
100 | } else { | |
1a29321e JHS |
101 | if (bind)/* dont override defaults */ |
102 | return 0; | |
86062033 | 103 | tcf_hash_release(a, bind); |
1a29321e | 104 | if (!ovr) |
1da177e4 | 105 | return -EEXIST; |
1da177e4 LT |
106 | } |
107 | ||
86062033 | 108 | gact = to_gact(a); |
e9ce1cd3 | 109 | |
56e5d1ca | 110 | ASSERT_RTNL(); |
e9ce1cd3 | 111 | gact->tcf_action = parm->action; |
1da177e4 | 112 | #ifdef CONFIG_GACT_PROB |
696ecdc1 | 113 | if (p_parm) { |
e9ce1cd3 | 114 | gact->tcfg_paction = p_parm->paction; |
cef5ecf9 ED |
115 | gact->tcfg_pval = max_t(u16, 1, p_parm->pval); |
116 | /* Make sure tcfg_pval is written before tcfg_ptype | |
117 | * coupled with smp_rmb() in gact_net_rand() & gact_determ() | |
118 | */ | |
119 | smp_wmb(); | |
e9ce1cd3 | 120 | gact->tcfg_ptype = p_parm->ptype; |
1da177e4 LT |
121 | } |
122 | #endif | |
1da177e4 | 123 | if (ret == ACT_P_CREATED) |
ddf97ccd | 124 | tcf_hash_insert(tn, a); |
1da177e4 LT |
125 | return ret; |
126 | } | |
127 | ||
dc7f9f6e ED |
128 | static int tcf_gact(struct sk_buff *skb, const struct tc_action *a, |
129 | struct tcf_result *res) | |
1da177e4 | 130 | { |
e9ce1cd3 | 131 | struct tcf_gact *gact = a->priv; |
56e5d1ca | 132 | int action = READ_ONCE(gact->tcf_action); |
1da177e4 | 133 | |
1da177e4 | 134 | #ifdef CONFIG_GACT_PROB |
8f2ae965 ED |
135 | { |
136 | u32 ptype = READ_ONCE(gact->tcfg_ptype); | |
137 | ||
138 | if (ptype) | |
139 | action = gact_rand[ptype](gact); | |
140 | } | |
1da177e4 | 141 | #endif |
56e5d1ca | 142 | bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), skb); |
1da177e4 | 143 | if (action == TC_ACT_SHOT) |
56e5d1ca ED |
144 | qstats_drop_inc(this_cpu_ptr(gact->common.cpu_qstats)); |
145 | ||
146 | tcf_lastuse_update(&gact->tcf_tm); | |
1da177e4 LT |
147 | |
148 | return action; | |
149 | } | |
150 | ||
9fea47d9 AV |
151 | static void tcf_gact_stats_update(struct tc_action *a, u64 bytes, u32 packets, |
152 | u64 lastuse) | |
153 | { | |
154 | struct tcf_gact *gact = a->priv; | |
155 | int action = READ_ONCE(gact->tcf_action); | |
156 | struct tcf_t *tm = &gact->tcf_tm; | |
157 | ||
158 | _bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), bytes, packets); | |
159 | if (action == TC_ACT_SHOT) | |
160 | this_cpu_ptr(gact->common.cpu_qstats)->drops += packets; | |
161 | ||
162 | tm->lastuse = lastuse; | |
163 | } | |
164 | ||
e9ce1cd3 | 165 | static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
1da177e4 | 166 | { |
27a884dc | 167 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 168 | struct tcf_gact *gact = a->priv; |
1c40be12 ED |
169 | struct tc_gact opt = { |
170 | .index = gact->tcf_index, | |
171 | .refcnt = gact->tcf_refcnt - ref, | |
172 | .bindcnt = gact->tcf_bindcnt - bind, | |
173 | .action = gact->tcf_action, | |
174 | }; | |
1da177e4 LT |
175 | struct tcf_t t; |
176 | ||
1b34ec43 DM |
177 | if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt)) |
178 | goto nla_put_failure; | |
1da177e4 | 179 | #ifdef CONFIG_GACT_PROB |
e9ce1cd3 | 180 | if (gact->tcfg_ptype) { |
1c40be12 ED |
181 | struct tc_gact_p p_opt = { |
182 | .paction = gact->tcfg_paction, | |
183 | .pval = gact->tcfg_pval, | |
184 | .ptype = gact->tcfg_ptype, | |
185 | }; | |
186 | ||
1b34ec43 DM |
187 | if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt)) |
188 | goto nla_put_failure; | |
1da177e4 LT |
189 | } |
190 | #endif | |
e9ce1cd3 DM |
191 | t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install); |
192 | t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse); | |
193 | t.expires = jiffies_to_clock_t(gact->tcf_tm.expires); | |
9854518e | 194 | if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD)) |
1b34ec43 | 195 | goto nla_put_failure; |
1da177e4 LT |
196 | return skb->len; |
197 | ||
7ba699c6 | 198 | nla_put_failure: |
dc5fc579 | 199 | nlmsg_trim(skb, b); |
1da177e4 LT |
200 | return -1; |
201 | } | |
202 | ||
ddf97ccd WC |
203 | static int tcf_gact_walker(struct net *net, struct sk_buff *skb, |
204 | struct netlink_callback *cb, int type, | |
205 | struct tc_action *a) | |
206 | { | |
207 | struct tc_action_net *tn = net_generic(net, gact_net_id); | |
208 | ||
209 | return tcf_generic_walker(tn, skb, cb, type, a); | |
210 | } | |
211 | ||
212 | static int tcf_gact_search(struct net *net, struct tc_action *a, u32 index) | |
213 | { | |
214 | struct tc_action_net *tn = net_generic(net, gact_net_id); | |
215 | ||
216 | return tcf_hash_search(tn, a, index); | |
217 | } | |
218 | ||
1da177e4 LT |
219 | static struct tc_action_ops act_gact_ops = { |
220 | .kind = "gact", | |
221 | .type = TCA_ACT_GACT, | |
1da177e4 LT |
222 | .owner = THIS_MODULE, |
223 | .act = tcf_gact, | |
9fea47d9 | 224 | .stats_update = tcf_gact_stats_update, |
1da177e4 | 225 | .dump = tcf_gact_dump, |
1da177e4 | 226 | .init = tcf_gact_init, |
ddf97ccd WC |
227 | .walk = tcf_gact_walker, |
228 | .lookup = tcf_gact_search, | |
229 | }; | |
230 | ||
231 | static __net_init int gact_init_net(struct net *net) | |
232 | { | |
233 | struct tc_action_net *tn = net_generic(net, gact_net_id); | |
234 | ||
235 | return tc_action_net_init(tn, &act_gact_ops, GACT_TAB_MASK); | |
236 | } | |
237 | ||
238 | static void __net_exit gact_exit_net(struct net *net) | |
239 | { | |
240 | struct tc_action_net *tn = net_generic(net, gact_net_id); | |
241 | ||
242 | tc_action_net_exit(tn); | |
243 | } | |
244 | ||
245 | static struct pernet_operations gact_net_ops = { | |
246 | .init = gact_init_net, | |
247 | .exit = gact_exit_net, | |
248 | .id = &gact_net_id, | |
249 | .size = sizeof(struct tc_action_net), | |
1da177e4 LT |
250 | }; |
251 | ||
252 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); | |
253 | MODULE_DESCRIPTION("Generic Classifier actions"); | |
254 | MODULE_LICENSE("GPL"); | |
255 | ||
e9ce1cd3 | 256 | static int __init gact_init_module(void) |
1da177e4 LT |
257 | { |
258 | #ifdef CONFIG_GACT_PROB | |
cc7ec456 | 259 | pr_info("GACT probability on\n"); |
1da177e4 | 260 | #else |
cc7ec456 | 261 | pr_info("GACT probability NOT on\n"); |
1da177e4 | 262 | #endif |
ddf97ccd WC |
263 | |
264 | return tcf_register_action(&act_gact_ops, &gact_net_ops); | |
1da177e4 LT |
265 | } |
266 | ||
e9ce1cd3 | 267 | static void __exit gact_cleanup_module(void) |
1da177e4 | 268 | { |
ddf97ccd | 269 | tcf_unregister_action(&act_gact_ops, &gact_net_ops); |
1da177e4 LT |
270 | } |
271 | ||
272 | module_init(gact_init_module); | |
273 | module_exit(gact_cleanup_module); |