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 |
1da177e4 LT |
27 | |
28 | #ifdef CONFIG_GACT_PROB | |
e9ce1cd3 | 29 | static int gact_net_rand(struct tcf_gact *gact) |
1da177e4 | 30 | { |
63862b5b | 31 | if (!gact->tcfg_pval || prandom_u32() % gact->tcfg_pval) |
e9ce1cd3 DM |
32 | return gact->tcf_action; |
33 | return gact->tcfg_paction; | |
1da177e4 LT |
34 | } |
35 | ||
e9ce1cd3 | 36 | static int gact_determ(struct tcf_gact *gact) |
1da177e4 | 37 | { |
a163148c | 38 | if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval) |
e9ce1cd3 DM |
39 | return gact->tcf_action; |
40 | return gact->tcfg_paction; | |
1da177e4 LT |
41 | } |
42 | ||
e9ce1cd3 | 43 | typedef int (*g_rand)(struct tcf_gact *gact); |
cc7ec456 | 44 | static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ }; |
e9ce1cd3 | 45 | #endif /* CONFIG_GACT_PROB */ |
1da177e4 | 46 | |
53b2bf3f PM |
47 | static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = { |
48 | [TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) }, | |
49 | [TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) }, | |
50 | }; | |
51 | ||
c1b52739 BL |
52 | static int tcf_gact_init(struct net *net, struct nlattr *nla, |
53 | struct nlattr *est, struct tc_action *a, | |
54 | int ovr, int bind) | |
1da177e4 | 55 | { |
7ba699c6 | 56 | struct nlattr *tb[TCA_GACT_MAX + 1]; |
1da177e4 | 57 | struct tc_gact *parm; |
e9ce1cd3 | 58 | struct tcf_gact *gact; |
1da177e4 | 59 | int ret = 0; |
cee63723 | 60 | int err; |
696ecdc1 HS |
61 | #ifdef CONFIG_GACT_PROB |
62 | struct tc_gact_p *p_parm = NULL; | |
63 | #endif | |
1da177e4 | 64 | |
cee63723 | 65 | if (nla == NULL) |
1da177e4 LT |
66 | return -EINVAL; |
67 | ||
53b2bf3f | 68 | err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy); |
cee63723 PM |
69 | if (err < 0) |
70 | return err; | |
71 | ||
53b2bf3f | 72 | if (tb[TCA_GACT_PARMS] == NULL) |
1da177e4 | 73 | return -EINVAL; |
7ba699c6 | 74 | parm = nla_data(tb[TCA_GACT_PARMS]); |
1da177e4 | 75 | |
53b2bf3f | 76 | #ifndef CONFIG_GACT_PROB |
7ba699c6 | 77 | if (tb[TCA_GACT_PROB] != NULL) |
1da177e4 | 78 | return -EOPNOTSUPP; |
696ecdc1 HS |
79 | #else |
80 | if (tb[TCA_GACT_PROB]) { | |
81 | p_parm = nla_data(tb[TCA_GACT_PROB]); | |
82 | if (p_parm->ptype >= MAX_RAND) | |
83 | return -EINVAL; | |
84 | } | |
1da177e4 LT |
85 | #endif |
86 | ||
86062033 WC |
87 | if (!tcf_hash_check(parm->index, a, bind)) { |
88 | ret = tcf_hash_create(parm->index, est, a, sizeof(*gact), bind); | |
89 | if (ret) | |
90 | return ret; | |
1da177e4 LT |
91 | ret = ACT_P_CREATED; |
92 | } else { | |
1a29321e JHS |
93 | if (bind)/* dont override defaults */ |
94 | return 0; | |
86062033 | 95 | tcf_hash_release(a, bind); |
1a29321e | 96 | if (!ovr) |
1da177e4 | 97 | return -EEXIST; |
1da177e4 LT |
98 | } |
99 | ||
86062033 | 100 | gact = to_gact(a); |
e9ce1cd3 DM |
101 | |
102 | spin_lock_bh(&gact->tcf_lock); | |
103 | gact->tcf_action = parm->action; | |
1da177e4 | 104 | #ifdef CONFIG_GACT_PROB |
696ecdc1 | 105 | if (p_parm) { |
e9ce1cd3 DM |
106 | gact->tcfg_paction = p_parm->paction; |
107 | gact->tcfg_pval = p_parm->pval; | |
108 | gact->tcfg_ptype = p_parm->ptype; | |
1da177e4 LT |
109 | } |
110 | #endif | |
e9ce1cd3 | 111 | spin_unlock_bh(&gact->tcf_lock); |
1da177e4 | 112 | if (ret == ACT_P_CREATED) |
86062033 | 113 | tcf_hash_insert(a); |
1da177e4 LT |
114 | return ret; |
115 | } | |
116 | ||
dc7f9f6e ED |
117 | static int tcf_gact(struct sk_buff *skb, const struct tc_action *a, |
118 | struct tcf_result *res) | |
1da177e4 | 119 | { |
e9ce1cd3 | 120 | struct tcf_gact *gact = a->priv; |
1da177e4 LT |
121 | int action = TC_ACT_SHOT; |
122 | ||
e9ce1cd3 | 123 | spin_lock(&gact->tcf_lock); |
1da177e4 | 124 | #ifdef CONFIG_GACT_PROB |
696ecdc1 | 125 | if (gact->tcfg_ptype) |
e9ce1cd3 | 126 | action = gact_rand[gact->tcfg_ptype](gact); |
1da177e4 | 127 | else |
e9ce1cd3 | 128 | action = gact->tcf_action; |
1da177e4 | 129 | #else |
e9ce1cd3 | 130 | action = gact->tcf_action; |
1da177e4 | 131 | #endif |
0abf77e5 | 132 | gact->tcf_bstats.bytes += qdisc_pkt_len(skb); |
e9ce1cd3 | 133 | gact->tcf_bstats.packets++; |
1da177e4 | 134 | if (action == TC_ACT_SHOT) |
e9ce1cd3 DM |
135 | gact->tcf_qstats.drops++; |
136 | gact->tcf_tm.lastuse = jiffies; | |
137 | spin_unlock(&gact->tcf_lock); | |
1da177e4 LT |
138 | |
139 | return action; | |
140 | } | |
141 | ||
e9ce1cd3 | 142 | static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
1da177e4 | 143 | { |
27a884dc | 144 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 145 | struct tcf_gact *gact = a->priv; |
1c40be12 ED |
146 | struct tc_gact opt = { |
147 | .index = gact->tcf_index, | |
148 | .refcnt = gact->tcf_refcnt - ref, | |
149 | .bindcnt = gact->tcf_bindcnt - bind, | |
150 | .action = gact->tcf_action, | |
151 | }; | |
1da177e4 LT |
152 | struct tcf_t t; |
153 | ||
1b34ec43 DM |
154 | if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt)) |
155 | goto nla_put_failure; | |
1da177e4 | 156 | #ifdef CONFIG_GACT_PROB |
e9ce1cd3 | 157 | if (gact->tcfg_ptype) { |
1c40be12 ED |
158 | struct tc_gact_p p_opt = { |
159 | .paction = gact->tcfg_paction, | |
160 | .pval = gact->tcfg_pval, | |
161 | .ptype = gact->tcfg_ptype, | |
162 | }; | |
163 | ||
1b34ec43 DM |
164 | if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt)) |
165 | goto nla_put_failure; | |
1da177e4 LT |
166 | } |
167 | #endif | |
e9ce1cd3 DM |
168 | t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install); |
169 | t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse); | |
170 | t.expires = jiffies_to_clock_t(gact->tcf_tm.expires); | |
1b34ec43 DM |
171 | if (nla_put(skb, TCA_GACT_TM, sizeof(t), &t)) |
172 | goto nla_put_failure; | |
1da177e4 LT |
173 | return skb->len; |
174 | ||
7ba699c6 | 175 | nla_put_failure: |
dc5fc579 | 176 | nlmsg_trim(skb, b); |
1da177e4 LT |
177 | return -1; |
178 | } | |
179 | ||
180 | static struct tc_action_ops act_gact_ops = { | |
181 | .kind = "gact", | |
182 | .type = TCA_ACT_GACT, | |
1da177e4 LT |
183 | .owner = THIS_MODULE, |
184 | .act = tcf_gact, | |
185 | .dump = tcf_gact_dump, | |
1da177e4 | 186 | .init = tcf_gact_init, |
1da177e4 LT |
187 | }; |
188 | ||
189 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); | |
190 | MODULE_DESCRIPTION("Generic Classifier actions"); | |
191 | MODULE_LICENSE("GPL"); | |
192 | ||
e9ce1cd3 | 193 | static int __init gact_init_module(void) |
1da177e4 LT |
194 | { |
195 | #ifdef CONFIG_GACT_PROB | |
cc7ec456 | 196 | pr_info("GACT probability on\n"); |
1da177e4 | 197 | #else |
cc7ec456 | 198 | pr_info("GACT probability NOT on\n"); |
1da177e4 | 199 | #endif |
4f1e9d89 | 200 | return tcf_register_action(&act_gact_ops, GACT_TAB_MASK); |
1da177e4 LT |
201 | } |
202 | ||
e9ce1cd3 | 203 | static void __exit gact_cleanup_module(void) |
1da177e4 LT |
204 | { |
205 | tcf_unregister_action(&act_gact_ops); | |
206 | } | |
207 | ||
208 | module_init(gact_init_module); | |
209 | module_exit(gact_cleanup_module); |