Commit | Line | Data |
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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 | 26 | #define GACT_TAB_MASK 15 |
369ba567 | 27 | static struct tcf_hashinfo gact_hash_info; |
1da177e4 LT |
28 | |
29 | #ifdef CONFIG_GACT_PROB | |
e9ce1cd3 | 30 | static int gact_net_rand(struct tcf_gact *gact) |
1da177e4 | 31 | { |
63862b5b | 32 | if (!gact->tcfg_pval || prandom_u32() % gact->tcfg_pval) |
e9ce1cd3 DM |
33 | return gact->tcf_action; |
34 | return gact->tcfg_paction; | |
1da177e4 LT |
35 | } |
36 | ||
e9ce1cd3 | 37 | static int gact_determ(struct tcf_gact *gact) |
1da177e4 | 38 | { |
a163148c | 39 | if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval) |
e9ce1cd3 DM |
40 | return gact->tcf_action; |
41 | return gact->tcfg_paction; | |
1da177e4 LT |
42 | } |
43 | ||
e9ce1cd3 | 44 | typedef int (*g_rand)(struct tcf_gact *gact); |
cc7ec456 | 45 | static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ }; |
e9ce1cd3 | 46 | #endif /* CONFIG_GACT_PROB */ |
1da177e4 | 47 | |
53b2bf3f PM |
48 | static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = { |
49 | [TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) }, | |
50 | [TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) }, | |
51 | }; | |
52 | ||
c1b52739 BL |
53 | static int tcf_gact_init(struct net *net, struct nlattr *nla, |
54 | struct nlattr *est, struct tc_action *a, | |
55 | int ovr, int bind) | |
1da177e4 | 56 | { |
7ba699c6 | 57 | struct nlattr *tb[TCA_GACT_MAX + 1]; |
1da177e4 | 58 | struct tc_gact *parm; |
e9ce1cd3 DM |
59 | struct tcf_gact *gact; |
60 | struct tcf_common *pc; | |
1da177e4 | 61 | int ret = 0; |
cee63723 | 62 | int err; |
696ecdc1 HS |
63 | #ifdef CONFIG_GACT_PROB |
64 | struct tc_gact_p *p_parm = NULL; | |
65 | #endif | |
1da177e4 | 66 | |
cee63723 | 67 | if (nla == NULL) |
1da177e4 LT |
68 | return -EINVAL; |
69 | ||
53b2bf3f | 70 | err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy); |
cee63723 PM |
71 | if (err < 0) |
72 | return err; | |
73 | ||
53b2bf3f | 74 | if (tb[TCA_GACT_PARMS] == NULL) |
1da177e4 | 75 | return -EINVAL; |
7ba699c6 | 76 | parm = nla_data(tb[TCA_GACT_PARMS]); |
1da177e4 | 77 | |
53b2bf3f | 78 | #ifndef CONFIG_GACT_PROB |
7ba699c6 | 79 | if (tb[TCA_GACT_PROB] != NULL) |
1da177e4 | 80 | return -EOPNOTSUPP; |
696ecdc1 HS |
81 | #else |
82 | if (tb[TCA_GACT_PROB]) { | |
83 | p_parm = nla_data(tb[TCA_GACT_PROB]); | |
84 | if (p_parm->ptype >= MAX_RAND) | |
85 | return -EINVAL; | |
86 | } | |
1da177e4 LT |
87 | #endif |
88 | ||
c779f7af | 89 | pc = tcf_hash_check(parm->index, a, bind); |
e9ce1cd3 | 90 | if (!pc) { |
c779f7af | 91 | pc = tcf_hash_create(parm->index, est, a, sizeof(*gact), bind); |
0e991ec6 | 92 | if (IS_ERR(pc)) |
cc7ec456 | 93 | return PTR_ERR(pc); |
1da177e4 LT |
94 | ret = ACT_P_CREATED; |
95 | } else { | |
1a29321e JHS |
96 | if (bind)/* dont override defaults */ |
97 | return 0; | |
c779f7af | 98 | tcf_hash_release(pc, bind, a->ops->hinfo); |
1a29321e | 99 | if (!ovr) |
1da177e4 | 100 | return -EEXIST; |
1da177e4 LT |
101 | } |
102 | ||
e9ce1cd3 DM |
103 | gact = to_gact(pc); |
104 | ||
105 | spin_lock_bh(&gact->tcf_lock); | |
106 | gact->tcf_action = parm->action; | |
1da177e4 | 107 | #ifdef CONFIG_GACT_PROB |
696ecdc1 | 108 | if (p_parm) { |
e9ce1cd3 DM |
109 | gact->tcfg_paction = p_parm->paction; |
110 | gact->tcfg_pval = p_parm->pval; | |
111 | gact->tcfg_ptype = p_parm->ptype; | |
1da177e4 LT |
112 | } |
113 | #endif | |
e9ce1cd3 | 114 | spin_unlock_bh(&gact->tcf_lock); |
1da177e4 | 115 | if (ret == ACT_P_CREATED) |
c779f7af | 116 | tcf_hash_insert(pc, a->ops->hinfo); |
1da177e4 LT |
117 | return ret; |
118 | } | |
119 | ||
e9ce1cd3 | 120 | static int tcf_gact_cleanup(struct tc_action *a, int bind) |
1da177e4 | 121 | { |
e9ce1cd3 | 122 | struct tcf_gact *gact = a->priv; |
1da177e4 | 123 | |
e9ce1cd3 | 124 | if (gact) |
c779f7af | 125 | return tcf_hash_release(&gact->common, bind, a->ops->hinfo); |
1da177e4 LT |
126 | return 0; |
127 | } | |
128 | ||
dc7f9f6e ED |
129 | static int tcf_gact(struct sk_buff *skb, const struct tc_action *a, |
130 | struct tcf_result *res) | |
1da177e4 | 131 | { |
e9ce1cd3 | 132 | struct tcf_gact *gact = a->priv; |
1da177e4 LT |
133 | int action = TC_ACT_SHOT; |
134 | ||
e9ce1cd3 | 135 | spin_lock(&gact->tcf_lock); |
1da177e4 | 136 | #ifdef CONFIG_GACT_PROB |
696ecdc1 | 137 | if (gact->tcfg_ptype) |
e9ce1cd3 | 138 | action = gact_rand[gact->tcfg_ptype](gact); |
1da177e4 | 139 | else |
e9ce1cd3 | 140 | action = gact->tcf_action; |
1da177e4 | 141 | #else |
e9ce1cd3 | 142 | action = gact->tcf_action; |
1da177e4 | 143 | #endif |
0abf77e5 | 144 | gact->tcf_bstats.bytes += qdisc_pkt_len(skb); |
e9ce1cd3 | 145 | gact->tcf_bstats.packets++; |
1da177e4 | 146 | if (action == TC_ACT_SHOT) |
e9ce1cd3 DM |
147 | gact->tcf_qstats.drops++; |
148 | gact->tcf_tm.lastuse = jiffies; | |
149 | spin_unlock(&gact->tcf_lock); | |
1da177e4 LT |
150 | |
151 | return action; | |
152 | } | |
153 | ||
e9ce1cd3 | 154 | static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
1da177e4 | 155 | { |
27a884dc | 156 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 157 | struct tcf_gact *gact = a->priv; |
1c40be12 ED |
158 | struct tc_gact opt = { |
159 | .index = gact->tcf_index, | |
160 | .refcnt = gact->tcf_refcnt - ref, | |
161 | .bindcnt = gact->tcf_bindcnt - bind, | |
162 | .action = gact->tcf_action, | |
163 | }; | |
1da177e4 LT |
164 | struct tcf_t t; |
165 | ||
1b34ec43 DM |
166 | if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt)) |
167 | goto nla_put_failure; | |
1da177e4 | 168 | #ifdef CONFIG_GACT_PROB |
e9ce1cd3 | 169 | if (gact->tcfg_ptype) { |
1c40be12 ED |
170 | struct tc_gact_p p_opt = { |
171 | .paction = gact->tcfg_paction, | |
172 | .pval = gact->tcfg_pval, | |
173 | .ptype = gact->tcfg_ptype, | |
174 | }; | |
175 | ||
1b34ec43 DM |
176 | if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt)) |
177 | goto nla_put_failure; | |
1da177e4 LT |
178 | } |
179 | #endif | |
e9ce1cd3 DM |
180 | t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install); |
181 | t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse); | |
182 | t.expires = jiffies_to_clock_t(gact->tcf_tm.expires); | |
1b34ec43 DM |
183 | if (nla_put(skb, TCA_GACT_TM, sizeof(t), &t)) |
184 | goto nla_put_failure; | |
1da177e4 LT |
185 | return skb->len; |
186 | ||
7ba699c6 | 187 | nla_put_failure: |
dc5fc579 | 188 | nlmsg_trim(skb, b); |
1da177e4 LT |
189 | return -1; |
190 | } | |
191 | ||
192 | static struct tc_action_ops act_gact_ops = { | |
193 | .kind = "gact", | |
e9ce1cd3 | 194 | .hinfo = &gact_hash_info, |
1da177e4 | 195 | .type = TCA_ACT_GACT, |
1da177e4 LT |
196 | .owner = THIS_MODULE, |
197 | .act = tcf_gact, | |
198 | .dump = tcf_gact_dump, | |
199 | .cleanup = tcf_gact_cleanup, | |
1da177e4 | 200 | .init = tcf_gact_init, |
1da177e4 LT |
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 | 208 | { |
568a153a | 209 | int err = tcf_hashinfo_init(&gact_hash_info, GACT_TAB_MASK); |
369ba567 WC |
210 | if (err) |
211 | return err; | |
1da177e4 | 212 | #ifdef CONFIG_GACT_PROB |
cc7ec456 | 213 | pr_info("GACT probability on\n"); |
1da177e4 | 214 | #else |
cc7ec456 | 215 | pr_info("GACT probability NOT on\n"); |
1da177e4 LT |
216 | #endif |
217 | return tcf_register_action(&act_gact_ops); | |
218 | } | |
219 | ||
e9ce1cd3 | 220 | static void __exit gact_cleanup_module(void) |
1da177e4 LT |
221 | { |
222 | tcf_unregister_action(&act_gact_ops); | |
369ba567 | 223 | tcf_hashinfo_destroy(&gact_hash_info); |
1da177e4 LT |
224 | } |
225 | ||
226 | module_init(gact_init_module); | |
227 | module_exit(gact_cleanup_module); |