]>
Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
0c6965dd | 3 | * net/sched/act_gact.c Generic actions |
1da177e4 | 4 | * |
1da177e4 | 5 | * copyright Jamal Hadi Salim (2002-4) |
1da177e4 LT |
6 | */ |
7 | ||
1da177e4 LT |
8 | #include <linux/types.h> |
9 | #include <linux/kernel.h> | |
1da177e4 | 10 | #include <linux/string.h> |
1da177e4 | 11 | #include <linux/errno.h> |
1da177e4 LT |
12 | #include <linux/skbuff.h> |
13 | #include <linux/rtnetlink.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
dc5fc579 | 16 | #include <net/netlink.h> |
1da177e4 | 17 | #include <net/pkt_sched.h> |
0da2dbd6 | 18 | #include <net/pkt_cls.h> |
1da177e4 LT |
19 | #include <linux/tc_act/tc_gact.h> |
20 | #include <net/tc_act/tc_gact.h> | |
21 | ||
c7d03a00 | 22 | static unsigned int gact_net_id; |
a85a970a | 23 | static struct tc_action_ops act_gact_ops; |
ddf97ccd | 24 | |
1da177e4 | 25 | #ifdef CONFIG_GACT_PROB |
e9ce1cd3 | 26 | static int gact_net_rand(struct tcf_gact *gact) |
1da177e4 | 27 | { |
cef5ecf9 ED |
28 | smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */ |
29 | if (prandom_u32() % gact->tcfg_pval) | |
e9ce1cd3 DM |
30 | return gact->tcf_action; |
31 | return gact->tcfg_paction; | |
1da177e4 LT |
32 | } |
33 | ||
e9ce1cd3 | 34 | static int gact_determ(struct tcf_gact *gact) |
1da177e4 | 35 | { |
cc6510a9 ED |
36 | u32 pack = atomic_inc_return(&gact->packets); |
37 | ||
cef5ecf9 | 38 | smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */ |
cc6510a9 | 39 | if (pack % gact->tcfg_pval) |
e9ce1cd3 DM |
40 | return gact->tcf_action; |
41 | return gact->tcfg_paction; | |
1da177e4 LT |
42 | } |
43 | ||
e9ce1cd3 | 44 | typedef int (*g_rand)(struct tcf_gact *gact); |
cc7ec456 | 45 | static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ }; |
e9ce1cd3 | 46 | #endif /* CONFIG_GACT_PROB */ |
1da177e4 | 47 | |
53b2bf3f PM |
48 | static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = { |
49 | [TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) }, | |
50 | [TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) }, | |
51 | }; | |
52 | ||
c1b52739 | 53 | static int tcf_gact_init(struct net *net, struct nlattr *nla, |
a85a970a | 54 | struct nlattr *est, struct tc_action **a, |
789871bb | 55 | int ovr, int bind, bool rtnl_held, |
abbb0d33 VB |
56 | struct tcf_proto *tp, u32 flags, |
57 | struct netlink_ext_ack *extack) | |
1da177e4 | 58 | { |
ddf97ccd | 59 | struct tc_action_net *tn = net_generic(net, gact_net_id); |
7ba699c6 | 60 | struct nlattr *tb[TCA_GACT_MAX + 1]; |
0da2dbd6 | 61 | struct tcf_chain *goto_ch = NULL; |
1da177e4 | 62 | struct tc_gact *parm; |
e9ce1cd3 | 63 | struct tcf_gact *gact; |
1da177e4 | 64 | int ret = 0; |
7be8ef2c | 65 | u32 index; |
cee63723 | 66 | int err; |
696ecdc1 HS |
67 | #ifdef CONFIG_GACT_PROB |
68 | struct tc_gact_p *p_parm = NULL; | |
69 | #endif | |
1da177e4 | 70 | |
cee63723 | 71 | if (nla == NULL) |
1da177e4 LT |
72 | return -EINVAL; |
73 | ||
8cb08174 JB |
74 | err = nla_parse_nested_deprecated(tb, TCA_GACT_MAX, nla, gact_policy, |
75 | 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]); |
7be8ef2c | 82 | index = parm->index; |
1da177e4 | 83 | |
53b2bf3f | 84 | #ifndef CONFIG_GACT_PROB |
7ba699c6 | 85 | if (tb[TCA_GACT_PROB] != NULL) |
1da177e4 | 86 | return -EOPNOTSUPP; |
696ecdc1 HS |
87 | #else |
88 | if (tb[TCA_GACT_PROB]) { | |
89 | p_parm = nla_data(tb[TCA_GACT_PROB]); | |
90 | if (p_parm->ptype >= MAX_RAND) | |
91 | return -EINVAL; | |
9469f375 DC |
92 | if (TC_ACT_EXT_CMP(p_parm->paction, TC_ACT_GOTO_CHAIN)) { |
93 | NL_SET_ERR_MSG(extack, | |
94 | "goto chain not allowed on fallback"); | |
95 | return -EINVAL; | |
96 | } | |
696ecdc1 | 97 | } |
1da177e4 LT |
98 | #endif |
99 | ||
7be8ef2c | 100 | err = tcf_idr_check_alloc(tn, &index, a, bind); |
0190c1d4 | 101 | if (!err) { |
e3822678 VB |
102 | ret = tcf_idr_create_from_flags(tn, index, est, a, |
103 | &act_gact_ops, bind, flags); | |
0190c1d4 | 104 | if (ret) { |
7be8ef2c | 105 | tcf_idr_cleanup(tn, index); |
86062033 | 106 | return ret; |
0190c1d4 | 107 | } |
1da177e4 | 108 | ret = ACT_P_CREATED; |
0190c1d4 | 109 | } else if (err > 0) { |
1a29321e JHS |
110 | if (bind)/* dont override defaults */ |
111 | return 0; | |
4e8ddd7f VB |
112 | if (!ovr) { |
113 | tcf_idr_release(*a, bind); | |
1da177e4 | 114 | return -EEXIST; |
4e8ddd7f | 115 | } |
0190c1d4 VB |
116 | } else { |
117 | return err; | |
1da177e4 LT |
118 | } |
119 | ||
0da2dbd6 DC |
120 | err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); |
121 | if (err < 0) | |
122 | goto release_idr; | |
a85a970a | 123 | gact = to_gact(*a); |
e9ce1cd3 | 124 | |
653cd284 | 125 | spin_lock_bh(&gact->tcf_lock); |
0da2dbd6 | 126 | goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
1da177e4 | 127 | #ifdef CONFIG_GACT_PROB |
696ecdc1 | 128 | if (p_parm) { |
e9ce1cd3 | 129 | gact->tcfg_paction = p_parm->paction; |
cef5ecf9 ED |
130 | gact->tcfg_pval = max_t(u16, 1, p_parm->pval); |
131 | /* Make sure tcfg_pval is written before tcfg_ptype | |
132 | * coupled with smp_rmb() in gact_net_rand() & gact_determ() | |
133 | */ | |
134 | smp_wmb(); | |
e9ce1cd3 | 135 | gact->tcfg_ptype = p_parm->ptype; |
1da177e4 LT |
136 | } |
137 | #endif | |
653cd284 | 138 | spin_unlock_bh(&gact->tcf_lock); |
e8917f43 | 139 | |
0da2dbd6 DC |
140 | if (goto_ch) |
141 | tcf_chain_put_by_act(goto_ch); | |
142 | ||
1da177e4 | 143 | if (ret == ACT_P_CREATED) |
65a206c0 | 144 | tcf_idr_insert(tn, *a); |
1da177e4 | 145 | return ret; |
0da2dbd6 DC |
146 | release_idr: |
147 | tcf_idr_release(*a, bind); | |
148 | return err; | |
1da177e4 LT |
149 | } |
150 | ||
1740005e JHS |
151 | static int tcf_gact_act(struct sk_buff *skb, const struct tc_action *a, |
152 | struct tcf_result *res) | |
1da177e4 | 153 | { |
a85a970a | 154 | struct tcf_gact *gact = to_gact(a); |
56e5d1ca | 155 | int action = READ_ONCE(gact->tcf_action); |
1da177e4 | 156 | |
1da177e4 | 157 | #ifdef CONFIG_GACT_PROB |
8f2ae965 ED |
158 | { |
159 | u32 ptype = READ_ONCE(gact->tcfg_ptype); | |
160 | ||
161 | if (ptype) | |
162 | action = gact_rand[ptype](gact); | |
163 | } | |
1da177e4 | 164 | #endif |
5e1ad95b | 165 | tcf_action_update_bstats(&gact->common, skb); |
1da177e4 | 166 | if (action == TC_ACT_SHOT) |
26b537a8 | 167 | tcf_action_inc_drop_qstats(&gact->common); |
56e5d1ca ED |
168 | |
169 | tcf_lastuse_update(&gact->tcf_tm); | |
1da177e4 LT |
170 | |
171 | return action; | |
172 | } | |
173 | ||
9fea47d9 | 174 | static void tcf_gact_stats_update(struct tc_action *a, u64 bytes, u32 packets, |
28169aba | 175 | u64 lastuse, bool hw) |
9fea47d9 | 176 | { |
a85a970a | 177 | struct tcf_gact *gact = to_gact(a); |
9fea47d9 AV |
178 | int action = READ_ONCE(gact->tcf_action); |
179 | struct tcf_t *tm = &gact->tcf_tm; | |
180 | ||
c8ecebd0 | 181 | tcf_action_update_stats(a, bytes, packets, action == TC_ACT_SHOT, hw); |
3bb23421 | 182 | tm->lastuse = max_t(u64, tm->lastuse, lastuse); |
9fea47d9 AV |
183 | } |
184 | ||
0b0f43fe JHS |
185 | static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, |
186 | int bind, int ref) | |
1da177e4 | 187 | { |
27a884dc | 188 | unsigned char *b = skb_tail_pointer(skb); |
a85a970a | 189 | struct tcf_gact *gact = to_gact(a); |
1c40be12 ED |
190 | struct tc_gact opt = { |
191 | .index = gact->tcf_index, | |
036bb443 VB |
192 | .refcnt = refcount_read(&gact->tcf_refcnt) - ref, |
193 | .bindcnt = atomic_read(&gact->tcf_bindcnt) - bind, | |
1c40be12 | 194 | }; |
1da177e4 LT |
195 | struct tcf_t t; |
196 | ||
653cd284 | 197 | spin_lock_bh(&gact->tcf_lock); |
e8917f43 | 198 | opt.action = gact->tcf_action; |
1b34ec43 DM |
199 | if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt)) |
200 | goto nla_put_failure; | |
1da177e4 | 201 | #ifdef CONFIG_GACT_PROB |
e9ce1cd3 | 202 | if (gact->tcfg_ptype) { |
1c40be12 ED |
203 | struct tc_gact_p p_opt = { |
204 | .paction = gact->tcfg_paction, | |
205 | .pval = gact->tcfg_pval, | |
206 | .ptype = gact->tcfg_ptype, | |
207 | }; | |
208 | ||
1b34ec43 DM |
209 | if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt)) |
210 | goto nla_put_failure; | |
1da177e4 LT |
211 | } |
212 | #endif | |
48d8ee16 | 213 | tcf_tm_dump(&t, &gact->tcf_tm); |
9854518e | 214 | if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD)) |
1b34ec43 | 215 | goto nla_put_failure; |
653cd284 | 216 | spin_unlock_bh(&gact->tcf_lock); |
e8917f43 | 217 | |
1da177e4 LT |
218 | return skb->len; |
219 | ||
7ba699c6 | 220 | nla_put_failure: |
653cd284 | 221 | spin_unlock_bh(&gact->tcf_lock); |
dc5fc579 | 222 | nlmsg_trim(skb, b); |
1da177e4 LT |
223 | return -1; |
224 | } | |
225 | ||
ddf97ccd WC |
226 | static int tcf_gact_walker(struct net *net, struct sk_buff *skb, |
227 | struct netlink_callback *cb, int type, | |
41780105 AA |
228 | const struct tc_action_ops *ops, |
229 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
230 | { |
231 | struct tc_action_net *tn = net_generic(net, gact_net_id); | |
232 | ||
b3620145 | 233 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ddf97ccd WC |
234 | } |
235 | ||
f061b48c | 236 | static int tcf_gact_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
237 | { |
238 | struct tc_action_net *tn = net_generic(net, gact_net_id); | |
239 | ||
65a206c0 | 240 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
241 | } |
242 | ||
9c5c9c57 RM |
243 | static size_t tcf_gact_get_fill_size(const struct tc_action *act) |
244 | { | |
245 | size_t sz = nla_total_size(sizeof(struct tc_gact)); /* TCA_GACT_PARMS */ | |
246 | ||
247 | #ifdef CONFIG_GACT_PROB | |
248 | if (to_gact(act)->tcfg_ptype) | |
249 | /* TCA_GACT_PROB */ | |
250 | sz += nla_total_size(sizeof(struct tc_gact_p)); | |
251 | #endif | |
252 | ||
253 | return sz; | |
254 | } | |
255 | ||
1da177e4 LT |
256 | static struct tc_action_ops act_gact_ops = { |
257 | .kind = "gact", | |
eddd2cf1 | 258 | .id = TCA_ID_GACT, |
1da177e4 | 259 | .owner = THIS_MODULE, |
1740005e | 260 | .act = tcf_gact_act, |
9fea47d9 | 261 | .stats_update = tcf_gact_stats_update, |
1da177e4 | 262 | .dump = tcf_gact_dump, |
1da177e4 | 263 | .init = tcf_gact_init, |
ddf97ccd WC |
264 | .walk = tcf_gact_walker, |
265 | .lookup = tcf_gact_search, | |
9c5c9c57 | 266 | .get_fill_size = tcf_gact_get_fill_size, |
a85a970a | 267 | .size = sizeof(struct tcf_gact), |
ddf97ccd WC |
268 | }; |
269 | ||
270 | static __net_init int gact_init_net(struct net *net) | |
271 | { | |
272 | struct tc_action_net *tn = net_generic(net, gact_net_id); | |
273 | ||
981471bd | 274 | return tc_action_net_init(net, tn, &act_gact_ops); |
ddf97ccd WC |
275 | } |
276 | ||
039af9c6 | 277 | static void __net_exit gact_exit_net(struct list_head *net_list) |
ddf97ccd | 278 | { |
039af9c6 | 279 | tc_action_net_exit(net_list, gact_net_id); |
ddf97ccd WC |
280 | } |
281 | ||
282 | static struct pernet_operations gact_net_ops = { | |
283 | .init = gact_init_net, | |
039af9c6 | 284 | .exit_batch = gact_exit_net, |
ddf97ccd WC |
285 | .id = &gact_net_id, |
286 | .size = sizeof(struct tc_action_net), | |
1da177e4 LT |
287 | }; |
288 | ||
289 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); | |
290 | MODULE_DESCRIPTION("Generic Classifier actions"); | |
291 | MODULE_LICENSE("GPL"); | |
292 | ||
e9ce1cd3 | 293 | static int __init gact_init_module(void) |
1da177e4 LT |
294 | { |
295 | #ifdef CONFIG_GACT_PROB | |
cc7ec456 | 296 | pr_info("GACT probability on\n"); |
1da177e4 | 297 | #else |
cc7ec456 | 298 | pr_info("GACT probability NOT on\n"); |
1da177e4 | 299 | #endif |
ddf97ccd WC |
300 | |
301 | return tcf_register_action(&act_gact_ops, &gact_net_ops); | |
1da177e4 LT |
302 | } |
303 | ||
e9ce1cd3 | 304 | static void __exit gact_cleanup_module(void) |
1da177e4 | 305 | { |
ddf97ccd | 306 | tcf_unregister_action(&act_gact_ops, &gact_net_ops); |
1da177e4 LT |
307 | } |
308 | ||
309 | module_init(gact_init_module); | |
310 | module_exit(gact_cleanup_module); |