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1da177e4 LT |
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 | ||
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 DM |
26 | #define GACT_TAB_MASK 15 |
27 | static struct tcf_common *tcf_gact_ht[GACT_TAB_MASK + 1]; | |
28 | static u32 gact_idx_gen; | |
1da177e4 LT |
29 | static DEFINE_RWLOCK(gact_lock); |
30 | ||
e9ce1cd3 DM |
31 | static struct tcf_hashinfo gact_hash_info = { |
32 | .htab = tcf_gact_ht, | |
33 | .hmask = GACT_TAB_MASK, | |
34 | .lock = &gact_lock, | |
35 | }; | |
1da177e4 LT |
36 | |
37 | #ifdef CONFIG_GACT_PROB | |
e9ce1cd3 | 38 | static int gact_net_rand(struct tcf_gact *gact) |
1da177e4 | 39 | { |
a163148c | 40 | if (!gact->tcfg_pval || net_random() % gact->tcfg_pval) |
e9ce1cd3 DM |
41 | return gact->tcf_action; |
42 | return gact->tcfg_paction; | |
1da177e4 LT |
43 | } |
44 | ||
e9ce1cd3 | 45 | static int gact_determ(struct tcf_gact *gact) |
1da177e4 | 46 | { |
a163148c | 47 | if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval) |
e9ce1cd3 DM |
48 | return gact->tcf_action; |
49 | return gact->tcfg_paction; | |
1da177e4 LT |
50 | } |
51 | ||
e9ce1cd3 | 52 | typedef int (*g_rand)(struct tcf_gact *gact); |
1da177e4 | 53 | static g_rand gact_rand[MAX_RAND]= { NULL, gact_net_rand, gact_determ }; |
e9ce1cd3 | 54 | #endif /* CONFIG_GACT_PROB */ |
1da177e4 | 55 | |
7ba699c6 | 56 | static int tcf_gact_init(struct nlattr *nla, struct nlattr *est, |
10297b99 | 57 | struct tc_action *a, int ovr, int bind) |
1da177e4 | 58 | { |
7ba699c6 | 59 | struct nlattr *tb[TCA_GACT_MAX + 1]; |
1da177e4 | 60 | struct tc_gact *parm; |
e9ce1cd3 DM |
61 | struct tcf_gact *gact; |
62 | struct tcf_common *pc; | |
1da177e4 | 63 | int ret = 0; |
cee63723 | 64 | int err; |
1da177e4 | 65 | |
cee63723 | 66 | if (nla == NULL) |
1da177e4 LT |
67 | return -EINVAL; |
68 | ||
cee63723 PM |
69 | err = nla_parse_nested(tb, TCA_GACT_MAX, nla, NULL); |
70 | if (err < 0) | |
71 | return err; | |
72 | ||
7ba699c6 PM |
73 | if (tb[TCA_GACT_PARMS] == NULL || |
74 | nla_len(tb[TCA_GACT_PARMS]) < sizeof(*parm)) | |
1da177e4 | 75 | return -EINVAL; |
7ba699c6 | 76 | parm = nla_data(tb[TCA_GACT_PARMS]); |
1da177e4 | 77 | |
7ba699c6 | 78 | if (tb[TCA_GACT_PROB] != NULL) |
1da177e4 | 79 | #ifdef CONFIG_GACT_PROB |
7ba699c6 | 80 | if (nla_len(tb[TCA_GACT_PROB]) < sizeof(struct tc_gact_p)) |
1da177e4 LT |
81 | return -EINVAL; |
82 | #else | |
83 | return -EOPNOTSUPP; | |
84 | #endif | |
85 | ||
e9ce1cd3 DM |
86 | pc = tcf_hash_check(parm->index, a, bind, &gact_hash_info); |
87 | if (!pc) { | |
88 | pc = tcf_hash_create(parm->index, est, a, sizeof(*gact), | |
89 | bind, &gact_idx_gen, &gact_hash_info); | |
90 | if (unlikely(!pc)) | |
1da177e4 LT |
91 | return -ENOMEM; |
92 | ret = ACT_P_CREATED; | |
93 | } else { | |
94 | if (!ovr) { | |
e9ce1cd3 | 95 | tcf_hash_release(pc, bind, &gact_hash_info); |
1da177e4 LT |
96 | return -EEXIST; |
97 | } | |
98 | } | |
99 | ||
e9ce1cd3 DM |
100 | gact = to_gact(pc); |
101 | ||
102 | spin_lock_bh(&gact->tcf_lock); | |
103 | gact->tcf_action = parm->action; | |
1da177e4 | 104 | #ifdef CONFIG_GACT_PROB |
7ba699c6 PM |
105 | if (tb[TCA_GACT_PROB] != NULL) { |
106 | struct tc_gact_p *p_parm = nla_data(tb[TCA_GACT_PROB]); | |
e9ce1cd3 DM |
107 | gact->tcfg_paction = p_parm->paction; |
108 | gact->tcfg_pval = p_parm->pval; | |
109 | gact->tcfg_ptype = p_parm->ptype; | |
1da177e4 LT |
110 | } |
111 | #endif | |
e9ce1cd3 | 112 | spin_unlock_bh(&gact->tcf_lock); |
1da177e4 | 113 | if (ret == ACT_P_CREATED) |
e9ce1cd3 | 114 | tcf_hash_insert(pc, &gact_hash_info); |
1da177e4 LT |
115 | return ret; |
116 | } | |
117 | ||
e9ce1cd3 | 118 | static int tcf_gact_cleanup(struct tc_action *a, int bind) |
1da177e4 | 119 | { |
e9ce1cd3 | 120 | struct tcf_gact *gact = a->priv; |
1da177e4 | 121 | |
e9ce1cd3 DM |
122 | if (gact) |
123 | return tcf_hash_release(&gact->common, bind, &gact_hash_info); | |
1da177e4 LT |
124 | return 0; |
125 | } | |
126 | ||
e9ce1cd3 | 127 | static int tcf_gact(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res) |
1da177e4 | 128 | { |
e9ce1cd3 | 129 | struct tcf_gact *gact = a->priv; |
1da177e4 LT |
130 | int action = TC_ACT_SHOT; |
131 | ||
e9ce1cd3 | 132 | spin_lock(&gact->tcf_lock); |
1da177e4 | 133 | #ifdef CONFIG_GACT_PROB |
e9ce1cd3 DM |
134 | if (gact->tcfg_ptype && gact_rand[gact->tcfg_ptype] != NULL) |
135 | action = gact_rand[gact->tcfg_ptype](gact); | |
1da177e4 | 136 | else |
e9ce1cd3 | 137 | action = gact->tcf_action; |
1da177e4 | 138 | #else |
e9ce1cd3 | 139 | action = gact->tcf_action; |
1da177e4 | 140 | #endif |
e9ce1cd3 DM |
141 | gact->tcf_bstats.bytes += skb->len; |
142 | gact->tcf_bstats.packets++; | |
1da177e4 | 143 | if (action == TC_ACT_SHOT) |
e9ce1cd3 DM |
144 | gact->tcf_qstats.drops++; |
145 | gact->tcf_tm.lastuse = jiffies; | |
146 | spin_unlock(&gact->tcf_lock); | |
1da177e4 LT |
147 | |
148 | return action; | |
149 | } | |
150 | ||
e9ce1cd3 | 151 | static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
1da177e4 | 152 | { |
27a884dc | 153 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 154 | struct tc_gact opt; |
e9ce1cd3 | 155 | struct tcf_gact *gact = a->priv; |
1da177e4 LT |
156 | struct tcf_t t; |
157 | ||
e9ce1cd3 DM |
158 | opt.index = gact->tcf_index; |
159 | opt.refcnt = gact->tcf_refcnt - ref; | |
160 | opt.bindcnt = gact->tcf_bindcnt - bind; | |
161 | opt.action = gact->tcf_action; | |
7ba699c6 | 162 | NLA_PUT(skb, TCA_GACT_PARMS, sizeof(opt), &opt); |
1da177e4 | 163 | #ifdef CONFIG_GACT_PROB |
e9ce1cd3 | 164 | if (gact->tcfg_ptype) { |
1da177e4 | 165 | struct tc_gact_p p_opt; |
e9ce1cd3 DM |
166 | p_opt.paction = gact->tcfg_paction; |
167 | p_opt.pval = gact->tcfg_pval; | |
168 | p_opt.ptype = gact->tcfg_ptype; | |
7ba699c6 | 169 | NLA_PUT(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt); |
1da177e4 LT |
170 | } |
171 | #endif | |
e9ce1cd3 DM |
172 | t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install); |
173 | t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse); | |
174 | t.expires = jiffies_to_clock_t(gact->tcf_tm.expires); | |
7ba699c6 | 175 | NLA_PUT(skb, TCA_GACT_TM, sizeof(t), &t); |
1da177e4 LT |
176 | return skb->len; |
177 | ||
7ba699c6 | 178 | nla_put_failure: |
dc5fc579 | 179 | nlmsg_trim(skb, b); |
1da177e4 LT |
180 | return -1; |
181 | } | |
182 | ||
183 | static struct tc_action_ops act_gact_ops = { | |
184 | .kind = "gact", | |
e9ce1cd3 | 185 | .hinfo = &gact_hash_info, |
1da177e4 LT |
186 | .type = TCA_ACT_GACT, |
187 | .capab = TCA_CAP_NONE, | |
188 | .owner = THIS_MODULE, | |
189 | .act = tcf_gact, | |
190 | .dump = tcf_gact_dump, | |
191 | .cleanup = tcf_gact_cleanup, | |
192 | .lookup = tcf_hash_search, | |
193 | .init = tcf_gact_init, | |
194 | .walk = tcf_generic_walker | |
195 | }; | |
196 | ||
197 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); | |
198 | MODULE_DESCRIPTION("Generic Classifier actions"); | |
199 | MODULE_LICENSE("GPL"); | |
200 | ||
e9ce1cd3 | 201 | static int __init gact_init_module(void) |
1da177e4 LT |
202 | { |
203 | #ifdef CONFIG_GACT_PROB | |
204 | printk("GACT probability on\n"); | |
205 | #else | |
206 | printk("GACT probability NOT on\n"); | |
207 | #endif | |
208 | return tcf_register_action(&act_gact_ops); | |
209 | } | |
210 | ||
e9ce1cd3 | 211 | static void __exit gact_cleanup_module(void) |
1da177e4 LT |
212 | { |
213 | tcf_unregister_action(&act_gact_ops); | |
214 | } | |
215 | ||
216 | module_init(gact_init_module); | |
217 | module_exit(gact_cleanup_module); |