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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 | ||
13 | #include <asm/uaccess.h> | |
14 | #include <asm/system.h> | |
15 | #include <linux/bitops.h> | |
1da177e4 LT |
16 | #include <linux/types.h> |
17 | #include <linux/kernel.h> | |
1da177e4 LT |
18 | #include <linux/string.h> |
19 | #include <linux/mm.h> | |
20 | #include <linux/socket.h> | |
21 | #include <linux/sockios.h> | |
22 | #include <linux/in.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/netdevice.h> | |
26 | #include <linux/skbuff.h> | |
27 | #include <linux/rtnetlink.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/proc_fs.h> | |
dc5fc579 | 31 | #include <net/netlink.h> |
1da177e4 LT |
32 | #include <net/sock.h> |
33 | #include <net/pkt_sched.h> | |
34 | #include <linux/tc_act/tc_gact.h> | |
35 | #include <net/tc_act/tc_gact.h> | |
36 | ||
e9ce1cd3 DM |
37 | #define GACT_TAB_MASK 15 |
38 | static struct tcf_common *tcf_gact_ht[GACT_TAB_MASK + 1]; | |
39 | static u32 gact_idx_gen; | |
1da177e4 LT |
40 | static DEFINE_RWLOCK(gact_lock); |
41 | ||
e9ce1cd3 DM |
42 | static struct tcf_hashinfo gact_hash_info = { |
43 | .htab = tcf_gact_ht, | |
44 | .hmask = GACT_TAB_MASK, | |
45 | .lock = &gact_lock, | |
46 | }; | |
1da177e4 LT |
47 | |
48 | #ifdef CONFIG_GACT_PROB | |
e9ce1cd3 | 49 | static int gact_net_rand(struct tcf_gact *gact) |
1da177e4 | 50 | { |
a163148c | 51 | if (!gact->tcfg_pval || net_random() % gact->tcfg_pval) |
e9ce1cd3 DM |
52 | return gact->tcf_action; |
53 | return gact->tcfg_paction; | |
1da177e4 LT |
54 | } |
55 | ||
e9ce1cd3 | 56 | static int gact_determ(struct tcf_gact *gact) |
1da177e4 | 57 | { |
a163148c | 58 | if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval) |
e9ce1cd3 DM |
59 | return gact->tcf_action; |
60 | return gact->tcfg_paction; | |
1da177e4 LT |
61 | } |
62 | ||
e9ce1cd3 | 63 | typedef int (*g_rand)(struct tcf_gact *gact); |
1da177e4 | 64 | static g_rand gact_rand[MAX_RAND]= { NULL, gact_net_rand, gact_determ }; |
e9ce1cd3 | 65 | #endif /* CONFIG_GACT_PROB */ |
1da177e4 LT |
66 | |
67 | static int tcf_gact_init(struct rtattr *rta, struct rtattr *est, | |
10297b99 | 68 | struct tc_action *a, int ovr, int bind) |
1da177e4 LT |
69 | { |
70 | struct rtattr *tb[TCA_GACT_MAX]; | |
71 | struct tc_gact *parm; | |
e9ce1cd3 DM |
72 | struct tcf_gact *gact; |
73 | struct tcf_common *pc; | |
1da177e4 LT |
74 | int ret = 0; |
75 | ||
76 | if (rta == NULL || rtattr_parse_nested(tb, TCA_GACT_MAX, rta) < 0) | |
77 | return -EINVAL; | |
78 | ||
79 | if (tb[TCA_GACT_PARMS - 1] == NULL || | |
80 | RTA_PAYLOAD(tb[TCA_GACT_PARMS - 1]) < sizeof(*parm)) | |
81 | return -EINVAL; | |
82 | parm = RTA_DATA(tb[TCA_GACT_PARMS - 1]); | |
83 | ||
84 | if (tb[TCA_GACT_PROB-1] != NULL) | |
85 | #ifdef CONFIG_GACT_PROB | |
86 | if (RTA_PAYLOAD(tb[TCA_GACT_PROB-1]) < sizeof(struct tc_gact_p)) | |
87 | return -EINVAL; | |
88 | #else | |
89 | return -EOPNOTSUPP; | |
90 | #endif | |
91 | ||
e9ce1cd3 DM |
92 | pc = tcf_hash_check(parm->index, a, bind, &gact_hash_info); |
93 | if (!pc) { | |
94 | pc = tcf_hash_create(parm->index, est, a, sizeof(*gact), | |
95 | bind, &gact_idx_gen, &gact_hash_info); | |
96 | if (unlikely(!pc)) | |
1da177e4 LT |
97 | return -ENOMEM; |
98 | ret = ACT_P_CREATED; | |
99 | } else { | |
100 | if (!ovr) { | |
e9ce1cd3 | 101 | tcf_hash_release(pc, bind, &gact_hash_info); |
1da177e4 LT |
102 | return -EEXIST; |
103 | } | |
104 | } | |
105 | ||
e9ce1cd3 DM |
106 | gact = to_gact(pc); |
107 | ||
108 | spin_lock_bh(&gact->tcf_lock); | |
109 | gact->tcf_action = parm->action; | |
1da177e4 LT |
110 | #ifdef CONFIG_GACT_PROB |
111 | if (tb[TCA_GACT_PROB-1] != NULL) { | |
112 | struct tc_gact_p *p_parm = RTA_DATA(tb[TCA_GACT_PROB-1]); | |
e9ce1cd3 DM |
113 | gact->tcfg_paction = p_parm->paction; |
114 | gact->tcfg_pval = p_parm->pval; | |
115 | gact->tcfg_ptype = p_parm->ptype; | |
1da177e4 LT |
116 | } |
117 | #endif | |
e9ce1cd3 | 118 | spin_unlock_bh(&gact->tcf_lock); |
1da177e4 | 119 | if (ret == ACT_P_CREATED) |
e9ce1cd3 | 120 | tcf_hash_insert(pc, &gact_hash_info); |
1da177e4 LT |
121 | return ret; |
122 | } | |
123 | ||
e9ce1cd3 | 124 | static int tcf_gact_cleanup(struct tc_action *a, int bind) |
1da177e4 | 125 | { |
e9ce1cd3 | 126 | struct tcf_gact *gact = a->priv; |
1da177e4 | 127 | |
e9ce1cd3 DM |
128 | if (gact) |
129 | return tcf_hash_release(&gact->common, bind, &gact_hash_info); | |
1da177e4 LT |
130 | return 0; |
131 | } | |
132 | ||
e9ce1cd3 | 133 | static int tcf_gact(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res) |
1da177e4 | 134 | { |
e9ce1cd3 | 135 | struct tcf_gact *gact = a->priv; |
1da177e4 LT |
136 | int action = TC_ACT_SHOT; |
137 | ||
e9ce1cd3 | 138 | spin_lock(&gact->tcf_lock); |
1da177e4 | 139 | #ifdef CONFIG_GACT_PROB |
e9ce1cd3 DM |
140 | if (gact->tcfg_ptype && gact_rand[gact->tcfg_ptype] != NULL) |
141 | action = gact_rand[gact->tcfg_ptype](gact); | |
1da177e4 | 142 | else |
e9ce1cd3 | 143 | action = gact->tcf_action; |
1da177e4 | 144 | #else |
e9ce1cd3 | 145 | action = gact->tcf_action; |
1da177e4 | 146 | #endif |
e9ce1cd3 DM |
147 | gact->tcf_bstats.bytes += skb->len; |
148 | gact->tcf_bstats.packets++; | |
1da177e4 | 149 | if (action == TC_ACT_SHOT) |
e9ce1cd3 DM |
150 | gact->tcf_qstats.drops++; |
151 | gact->tcf_tm.lastuse = jiffies; | |
152 | spin_unlock(&gact->tcf_lock); | |
1da177e4 LT |
153 | |
154 | return action; | |
155 | } | |
156 | ||
e9ce1cd3 | 157 | static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
1da177e4 | 158 | { |
27a884dc | 159 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 160 | struct tc_gact opt; |
e9ce1cd3 | 161 | struct tcf_gact *gact = a->priv; |
1da177e4 LT |
162 | struct tcf_t t; |
163 | ||
e9ce1cd3 DM |
164 | opt.index = gact->tcf_index; |
165 | opt.refcnt = gact->tcf_refcnt - ref; | |
166 | opt.bindcnt = gact->tcf_bindcnt - bind; | |
167 | opt.action = gact->tcf_action; | |
1da177e4 LT |
168 | RTA_PUT(skb, TCA_GACT_PARMS, sizeof(opt), &opt); |
169 | #ifdef CONFIG_GACT_PROB | |
e9ce1cd3 | 170 | if (gact->tcfg_ptype) { |
1da177e4 | 171 | struct tc_gact_p p_opt; |
e9ce1cd3 DM |
172 | p_opt.paction = gact->tcfg_paction; |
173 | p_opt.pval = gact->tcfg_pval; | |
174 | p_opt.ptype = gact->tcfg_ptype; | |
1da177e4 LT |
175 | RTA_PUT(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt); |
176 | } | |
177 | #endif | |
e9ce1cd3 DM |
178 | t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install); |
179 | t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse); | |
180 | t.expires = jiffies_to_clock_t(gact->tcf_tm.expires); | |
1da177e4 LT |
181 | RTA_PUT(skb, TCA_GACT_TM, sizeof(t), &t); |
182 | return skb->len; | |
183 | ||
e9ce1cd3 | 184 | rtattr_failure: |
dc5fc579 | 185 | nlmsg_trim(skb, b); |
1da177e4 LT |
186 | return -1; |
187 | } | |
188 | ||
189 | static struct tc_action_ops act_gact_ops = { | |
190 | .kind = "gact", | |
e9ce1cd3 | 191 | .hinfo = &gact_hash_info, |
1da177e4 LT |
192 | .type = TCA_ACT_GACT, |
193 | .capab = TCA_CAP_NONE, | |
194 | .owner = THIS_MODULE, | |
195 | .act = tcf_gact, | |
196 | .dump = tcf_gact_dump, | |
197 | .cleanup = tcf_gact_cleanup, | |
198 | .lookup = tcf_hash_search, | |
199 | .init = tcf_gact_init, | |
200 | .walk = tcf_generic_walker | |
201 | }; | |
202 | ||
203 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); | |
204 | MODULE_DESCRIPTION("Generic Classifier actions"); | |
205 | MODULE_LICENSE("GPL"); | |
206 | ||
e9ce1cd3 | 207 | static int __init gact_init_module(void) |
1da177e4 LT |
208 | { |
209 | #ifdef CONFIG_GACT_PROB | |
210 | printk("GACT probability on\n"); | |
211 | #else | |
212 | printk("GACT probability NOT on\n"); | |
213 | #endif | |
214 | return tcf_register_action(&act_gact_ops); | |
215 | } | |
216 | ||
e9ce1cd3 | 217 | static void __exit gact_cleanup_module(void) |
1da177e4 LT |
218 | { |
219 | tcf_unregister_action(&act_gact_ops); | |
220 | } | |
221 | ||
222 | module_init(gact_init_module); | |
223 | module_exit(gact_cleanup_module); |