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