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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 <linux/tc_act/tc_gact.h>
24#include <net/tc_act/tc_gact.h>
25
26#define GACT_TAB_MASK 15
27static struct tcf_common *tcf_gact_ht[GACT_TAB_MASK + 1];
28static u32 gact_idx_gen;
29static DEFINE_RWLOCK(gact_lock);
30
31static struct tcf_hashinfo gact_hash_info = {
32 .htab = tcf_gact_ht,
33 .hmask = GACT_TAB_MASK,
34 .lock = &gact_lock,
35};
36
37#ifdef CONFIG_GACT_PROB
38static int gact_net_rand(struct tcf_gact *gact)
39{
40 if (!gact->tcfg_pval || net_random() % gact->tcfg_pval)
41 return gact->tcf_action;
42 return gact->tcfg_paction;
43}
44
45static int gact_determ(struct tcf_gact *gact)
46{
47 if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval)
48 return gact->tcf_action;
49 return gact->tcfg_paction;
50}
51
52typedef int (*g_rand)(struct tcf_gact *gact);
53static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
54#endif
55
56static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
57 [TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) },
58 [TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) },
59};
60
61static int tcf_gact_init(struct net *net, struct nlattr *nla,
62 struct nlattr *est, struct tc_action *a,
63 int ovr, int bind)
64{
65 struct nlattr *tb[TCA_GACT_MAX + 1];
66 struct tc_gact *parm;
67 struct tcf_gact *gact;
68 struct tcf_common *pc;
69 int ret = 0;
70 int err;
71#ifdef CONFIG_GACT_PROB
72 struct tc_gact_p *p_parm = NULL;
73#endif
74
75 if (nla == NULL)
76 return -EINVAL;
77
78 err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy);
79 if (err < 0)
80 return err;
81
82 if (tb[TCA_GACT_PARMS] == NULL)
83 return -EINVAL;
84 parm = nla_data(tb[TCA_GACT_PARMS]);
85
86#ifndef CONFIG_GACT_PROB
87 if (tb[TCA_GACT_PROB] != NULL)
88 return -EOPNOTSUPP;
89#else
90 if (tb[TCA_GACT_PROB]) {
91 p_parm = nla_data(tb[TCA_GACT_PROB]);
92 if (p_parm->ptype >= MAX_RAND)
93 return -EINVAL;
94 }
95#endif
96
97 pc = tcf_hash_check(parm->index, a, bind, &gact_hash_info);
98 if (!pc) {
99 pc = tcf_hash_create(parm->index, est, a, sizeof(*gact),
100 bind, &gact_idx_gen, &gact_hash_info);
101 if (IS_ERR(pc))
102 return PTR_ERR(pc);
103 ret = ACT_P_CREATED;
104 } else {
105 if (!ovr) {
106 tcf_hash_release(pc, bind, &gact_hash_info);
107 return -EEXIST;
108 }
109 }
110
111 gact = to_gact(pc);
112
113 spin_lock_bh(&gact->tcf_lock);
114 gact->tcf_action = parm->action;
115#ifdef CONFIG_GACT_PROB
116 if (p_parm) {
117 gact->tcfg_paction = p_parm->paction;
118 gact->tcfg_pval = p_parm->pval;
119 gact->tcfg_ptype = p_parm->ptype;
120 }
121#endif
122 spin_unlock_bh(&gact->tcf_lock);
123 if (ret == ACT_P_CREATED)
124 tcf_hash_insert(pc, &gact_hash_info);
125 return ret;
126}
127
128static int tcf_gact_cleanup(struct tc_action *a, int bind)
129{
130 struct tcf_gact *gact = a->priv;
131
132 if (gact)
133 return tcf_hash_release(&gact->common, bind, &gact_hash_info);
134 return 0;
135}
136
137static int tcf_gact(struct sk_buff *skb, const struct tc_action *a,
138 struct tcf_result *res)
139{
140 struct tcf_gact *gact = a->priv;
141 int action = TC_ACT_SHOT;
142
143 spin_lock(&gact->tcf_lock);
144#ifdef CONFIG_GACT_PROB
145 if (gact->tcfg_ptype)
146 action = gact_rand[gact->tcfg_ptype](gact);
147 else
148 action = gact->tcf_action;
149#else
150 action = gact->tcf_action;
151#endif
152 gact->tcf_bstats.bytes += qdisc_pkt_len(skb);
153 gact->tcf_bstats.packets++;
154 if (action == TC_ACT_SHOT)
155 gact->tcf_qstats.drops++;
156 gact->tcf_tm.lastuse = jiffies;
157 spin_unlock(&gact->tcf_lock);
158
159 return action;
160}
161
162static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
163{
164 unsigned char *b = skb_tail_pointer(skb);
165 struct tcf_gact *gact = a->priv;
166 struct tc_gact opt = {
167 .index = gact->tcf_index,
168 .refcnt = gact->tcf_refcnt - ref,
169 .bindcnt = gact->tcf_bindcnt - bind,
170 .action = gact->tcf_action,
171 };
172 struct tcf_t t;
173
174 if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
175 goto nla_put_failure;
176#ifdef CONFIG_GACT_PROB
177 if (gact->tcfg_ptype) {
178 struct tc_gact_p p_opt = {
179 .paction = gact->tcfg_paction,
180 .pval = gact->tcfg_pval,
181 .ptype = gact->tcfg_ptype,
182 };
183
184 if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
185 goto nla_put_failure;
186 }
187#endif
188 t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install);
189 t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse);
190 t.expires = jiffies_to_clock_t(gact->tcf_tm.expires);
191 if (nla_put(skb, TCA_GACT_TM, sizeof(t), &t))
192 goto nla_put_failure;
193 return skb->len;
194
195nla_put_failure:
196 nlmsg_trim(skb, b);
197 return -1;
198}
199
200static struct tc_action_ops act_gact_ops = {
201 .kind = "gact",
202 .hinfo = &gact_hash_info,
203 .type = TCA_ACT_GACT,
204 .capab = TCA_CAP_NONE,
205 .owner = THIS_MODULE,
206 .act = tcf_gact,
207 .dump = tcf_gact_dump,
208 .cleanup = tcf_gact_cleanup,
209 .lookup = tcf_hash_search,
210 .init = tcf_gact_init,
211 .walk = tcf_generic_walker
212};
213
214MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
215MODULE_DESCRIPTION("Generic Classifier actions");
216MODULE_LICENSE("GPL");
217
218static int __init gact_init_module(void)
219{
220#ifdef CONFIG_GACT_PROB
221 pr_info("GACT probability on\n");
222#else
223 pr_info("GACT probability NOT on\n");
224#endif
225 return tcf_register_action(&act_gact_ops);
226}
227
228static void __exit gact_cleanup_module(void)
229{
230 tcf_unregister_action(&act_gact_ops);
231}
232
233module_init(gact_init_module);
234module_exit(gact_cleanup_module);
235
