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13#include <linux/types.h>
14#include <linux/kernel.h>
15#include <linux/string.h>
16#include <linux/errno.h>
17#include <linux/skbuff.h>
18#include <linux/rtnetlink.h>
19#include <linux/module.h>
20#include <linux/init.h>
21#include <net/netlink.h>
22#include <net/pkt_sched.h>
23#include <net/pkt_cls.h>
24#include <linux/tc_act/tc_gact.h>
25#include <net/tc_act/tc_gact.h>
26
27static unsigned int gact_net_id;
28static struct tc_action_ops act_gact_ops;
29
30#ifdef CONFIG_GACT_PROB
31static int gact_net_rand(struct tcf_gact *gact)
32{
33 smp_rmb();
34 if (prandom_u32() % gact->tcfg_pval)
35 return gact->tcf_action;
36 return gact->tcfg_paction;
37}
38
39static int gact_determ(struct tcf_gact *gact)
40{
41 u32 pack = atomic_inc_return(&gact->packets);
42
43 smp_rmb();
44 if (pack % gact->tcfg_pval)
45 return gact->tcf_action;
46 return gact->tcfg_paction;
47}
48
49typedef int (*g_rand)(struct tcf_gact *gact);
50static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
51#endif
52
53static 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
58static int tcf_gact_init(struct net *net, struct nlattr *nla,
59 struct nlattr *est, struct tc_action **a,
60 int ovr, int bind, bool rtnl_held,
61 struct tcf_proto *tp, u32 flags,
62 struct netlink_ext_ack *extack)
63{
64 struct tc_action_net *tn = net_generic(net, gact_net_id);
65 struct nlattr *tb[TCA_GACT_MAX + 1];
66 struct tcf_chain *goto_ch = NULL;
67 struct tc_gact *parm;
68 struct tcf_gact *gact;
69 int ret = 0;
70 u32 index;
71 int err;
72#ifdef CONFIG_GACT_PROB
73 struct tc_gact_p *p_parm = NULL;
74#endif
75
76 if (nla == NULL)
77 return -EINVAL;
78
79 err = nla_parse_nested_deprecated(tb, TCA_GACT_MAX, nla, gact_policy,
80 NULL);
81 if (err < 0)
82 return err;
83
84 if (tb[TCA_GACT_PARMS] == NULL)
85 return -EINVAL;
86 parm = nla_data(tb[TCA_GACT_PARMS]);
87 index = parm->index;
88
89#ifndef CONFIG_GACT_PROB
90 if (tb[TCA_GACT_PROB] != NULL)
91 return -EOPNOTSUPP;
92#else
93 if (tb[TCA_GACT_PROB]) {
94 p_parm = nla_data(tb[TCA_GACT_PROB]);
95 if (p_parm->ptype >= MAX_RAND)
96 return -EINVAL;
97 if (TC_ACT_EXT_CMP(p_parm->paction, TC_ACT_GOTO_CHAIN)) {
98 NL_SET_ERR_MSG(extack,
99 "goto chain not allowed on fallback");
100 return -EINVAL;
101 }
102 }
103#endif
104
105 err = tcf_idr_check_alloc(tn, &index, a, bind);
106 if (!err) {
107 ret = tcf_idr_create_from_flags(tn, index, est, a,
108 &act_gact_ops, bind, flags);
109 if (ret) {
110 tcf_idr_cleanup(tn, index);
111 return ret;
112 }
113 ret = ACT_P_CREATED;
114 } else if (err > 0) {
115 if (bind)
116 return 0;
117 if (!ovr) {
118 tcf_idr_release(*a, bind);
119 return -EEXIST;
120 }
121 } else {
122 return err;
123 }
124
125 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
126 if (err < 0)
127 goto release_idr;
128 gact = to_gact(*a);
129
130 spin_lock_bh(&gact->tcf_lock);
131 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
132#ifdef CONFIG_GACT_PROB
133 if (p_parm) {
134 gact->tcfg_paction = p_parm->paction;
135 gact->tcfg_pval = max_t(u16, 1, p_parm->pval);
136
137
138
139 smp_wmb();
140 gact->tcfg_ptype = p_parm->ptype;
141 }
142#endif
143 spin_unlock_bh(&gact->tcf_lock);
144
145 if (goto_ch)
146 tcf_chain_put_by_act(goto_ch);
147
148 return ret;
149release_idr:
150 tcf_idr_release(*a, bind);
151 return err;
152}
153
154static int tcf_gact_act(struct sk_buff *skb, const struct tc_action *a,
155 struct tcf_result *res)
156{
157 struct tcf_gact *gact = to_gact(a);
158 int action = READ_ONCE(gact->tcf_action);
159
160#ifdef CONFIG_GACT_PROB
161 {
162 u32 ptype = READ_ONCE(gact->tcfg_ptype);
163
164 if (ptype)
165 action = gact_rand[ptype](gact);
166 }
167#endif
168 tcf_action_update_bstats(&gact->common, skb);
169 if (action == TC_ACT_SHOT)
170 tcf_action_inc_drop_qstats(&gact->common);
171
172 tcf_lastuse_update(&gact->tcf_tm);
173
174 return action;
175}
176
177static void tcf_gact_stats_update(struct tc_action *a, u64 bytes, u64 packets,
178 u64 drops, u64 lastuse, bool hw)
179{
180 struct tcf_gact *gact = to_gact(a);
181 int action = READ_ONCE(gact->tcf_action);
182 struct tcf_t *tm = &gact->tcf_tm;
183
184 tcf_action_update_stats(a, bytes, packets,
185 action == TC_ACT_SHOT ? packets : drops, hw);
186 tm->lastuse = max_t(u64, tm->lastuse, lastuse);
187}
188
189static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a,
190 int bind, int ref)
191{
192 unsigned char *b = skb_tail_pointer(skb);
193 struct tcf_gact *gact = to_gact(a);
194 struct tc_gact opt = {
195 .index = gact->tcf_index,
196 .refcnt = refcount_read(&gact->tcf_refcnt) - ref,
197 .bindcnt = atomic_read(&gact->tcf_bindcnt) - bind,
198 };
199 struct tcf_t t;
200
201 spin_lock_bh(&gact->tcf_lock);
202 opt.action = gact->tcf_action;
203 if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
204 goto nla_put_failure;
205#ifdef CONFIG_GACT_PROB
206 if (gact->tcfg_ptype) {
207 struct tc_gact_p p_opt = {
208 .paction = gact->tcfg_paction,
209 .pval = gact->tcfg_pval,
210 .ptype = gact->tcfg_ptype,
211 };
212
213 if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
214 goto nla_put_failure;
215 }
216#endif
217 tcf_tm_dump(&t, &gact->tcf_tm);
218 if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD))
219 goto nla_put_failure;
220 spin_unlock_bh(&gact->tcf_lock);
221
222 return skb->len;
223
224nla_put_failure:
225 spin_unlock_bh(&gact->tcf_lock);
226 nlmsg_trim(skb, b);
227 return -1;
228}
229
230static int tcf_gact_walker(struct net *net, struct sk_buff *skb,
231 struct netlink_callback *cb, int type,
232 const struct tc_action_ops *ops,
233 struct netlink_ext_ack *extack)
234{
235 struct tc_action_net *tn = net_generic(net, gact_net_id);
236
237 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
238}
239
240static int tcf_gact_search(struct net *net, struct tc_action **a, u32 index)
241{
242 struct tc_action_net *tn = net_generic(net, gact_net_id);
243
244 return tcf_idr_search(tn, a, index);
245}
246
247static size_t tcf_gact_get_fill_size(const struct tc_action *act)
248{
249 size_t sz = nla_total_size(sizeof(struct tc_gact));
250
251#ifdef CONFIG_GACT_PROB
252 if (to_gact(act)->tcfg_ptype)
253
254 sz += nla_total_size(sizeof(struct tc_gact_p));
255#endif
256
257 return sz;
258}
259
260static struct tc_action_ops act_gact_ops = {
261 .kind = "gact",
262 .id = TCA_ID_GACT,
263 .owner = THIS_MODULE,
264 .act = tcf_gact_act,
265 .stats_update = tcf_gact_stats_update,
266 .dump = tcf_gact_dump,
267 .init = tcf_gact_init,
268 .walk = tcf_gact_walker,
269 .lookup = tcf_gact_search,
270 .get_fill_size = tcf_gact_get_fill_size,
271 .size = sizeof(struct tcf_gact),
272};
273
274static __net_init int gact_init_net(struct net *net)
275{
276 struct tc_action_net *tn = net_generic(net, gact_net_id);
277
278 return tc_action_net_init(net, tn, &act_gact_ops);
279}
280
281static void __net_exit gact_exit_net(struct list_head *net_list)
282{
283 tc_action_net_exit(net_list, gact_net_id);
284}
285
286static struct pernet_operations gact_net_ops = {
287 .init = gact_init_net,
288 .exit_batch = gact_exit_net,
289 .id = &gact_net_id,
290 .size = sizeof(struct tc_action_net),
291};
292
293MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
294MODULE_DESCRIPTION("Generic Classifier actions");
295MODULE_LICENSE("GPL");
296
297static int __init gact_init_module(void)
298{
299#ifdef CONFIG_GACT_PROB
300 pr_info("GACT probability on\n");
301#else
302 pr_info("GACT probability NOT on\n");
303#endif
304
305 return tcf_register_action(&act_gact_ops, &gact_net_ops);
306}
307
308static void __exit gact_cleanup_module(void)
309{
310 tcf_unregister_action(&act_gact_ops, &gact_net_ops);
311}
312
313module_init(gact_init_module);
314module_exit(gact_cleanup_module);
315
