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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 | 59 | struct tcf_gact *gact; |
1da177e4 | 60 | int ret = 0; |
cee63723 | 61 | int err; |
696ecdc1 HS |
62 | #ifdef CONFIG_GACT_PROB |
63 | struct tc_gact_p *p_parm = NULL; | |
64 | #endif | |
1da177e4 | 65 | |
cee63723 | 66 | if (nla == NULL) |
1da177e4 LT |
67 | return -EINVAL; |
68 | ||
53b2bf3f | 69 | err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy); |
cee63723 PM |
70 | if (err < 0) |
71 | return err; | |
72 | ||
53b2bf3f | 73 | if (tb[TCA_GACT_PARMS] == NULL) |
1da177e4 | 74 | return -EINVAL; |
7ba699c6 | 75 | parm = nla_data(tb[TCA_GACT_PARMS]); |
1da177e4 | 76 | |
53b2bf3f | 77 | #ifndef CONFIG_GACT_PROB |
7ba699c6 | 78 | if (tb[TCA_GACT_PROB] != NULL) |
1da177e4 | 79 | return -EOPNOTSUPP; |
696ecdc1 HS |
80 | #else |
81 | if (tb[TCA_GACT_PROB]) { | |
82 | p_parm = nla_data(tb[TCA_GACT_PROB]); | |
83 | if (p_parm->ptype >= MAX_RAND) | |
84 | return -EINVAL; | |
85 | } | |
1da177e4 LT |
86 | #endif |
87 | ||
86062033 WC |
88 | if (!tcf_hash_check(parm->index, a, bind)) { |
89 | ret = tcf_hash_create(parm->index, est, a, sizeof(*gact), bind); | |
90 | if (ret) | |
91 | return ret; | |
1da177e4 LT |
92 | ret = ACT_P_CREATED; |
93 | } else { | |
1a29321e JHS |
94 | if (bind)/* dont override defaults */ |
95 | return 0; | |
86062033 | 96 | tcf_hash_release(a, bind); |
1a29321e | 97 | if (!ovr) |
1da177e4 | 98 | return -EEXIST; |
1da177e4 LT |
99 | } |
100 | ||
86062033 | 101 | gact = to_gact(a); |
e9ce1cd3 DM |
102 | |
103 | spin_lock_bh(&gact->tcf_lock); | |
104 | gact->tcf_action = parm->action; | |
1da177e4 | 105 | #ifdef CONFIG_GACT_PROB |
696ecdc1 | 106 | if (p_parm) { |
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) |
86062033 | 114 | tcf_hash_insert(a); |
1da177e4 LT |
115 | return ret; |
116 | } | |
117 | ||
dc7f9f6e ED |
118 | static int tcf_gact(struct sk_buff *skb, const struct tc_action *a, |
119 | struct tcf_result *res) | |
1da177e4 | 120 | { |
e9ce1cd3 | 121 | struct tcf_gact *gact = a->priv; |
1da177e4 LT |
122 | int action = TC_ACT_SHOT; |
123 | ||
e9ce1cd3 | 124 | spin_lock(&gact->tcf_lock); |
1da177e4 | 125 | #ifdef CONFIG_GACT_PROB |
696ecdc1 | 126 | if (gact->tcfg_ptype) |
e9ce1cd3 | 127 | action = gact_rand[gact->tcfg_ptype](gact); |
1da177e4 | 128 | else |
e9ce1cd3 | 129 | action = gact->tcf_action; |
1da177e4 | 130 | #else |
e9ce1cd3 | 131 | action = gact->tcf_action; |
1da177e4 | 132 | #endif |
0abf77e5 | 133 | gact->tcf_bstats.bytes += qdisc_pkt_len(skb); |
e9ce1cd3 | 134 | gact->tcf_bstats.packets++; |
1da177e4 | 135 | if (action == TC_ACT_SHOT) |
e9ce1cd3 DM |
136 | gact->tcf_qstats.drops++; |
137 | gact->tcf_tm.lastuse = jiffies; | |
138 | spin_unlock(&gact->tcf_lock); | |
1da177e4 LT |
139 | |
140 | return action; | |
141 | } | |
142 | ||
e9ce1cd3 | 143 | static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
1da177e4 | 144 | { |
27a884dc | 145 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 146 | struct tcf_gact *gact = a->priv; |
1c40be12 ED |
147 | struct tc_gact opt = { |
148 | .index = gact->tcf_index, | |
149 | .refcnt = gact->tcf_refcnt - ref, | |
150 | .bindcnt = gact->tcf_bindcnt - bind, | |
151 | .action = gact->tcf_action, | |
152 | }; | |
1da177e4 LT |
153 | struct tcf_t t; |
154 | ||
1b34ec43 DM |
155 | if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt)) |
156 | goto nla_put_failure; | |
1da177e4 | 157 | #ifdef CONFIG_GACT_PROB |
e9ce1cd3 | 158 | if (gact->tcfg_ptype) { |
1c40be12 ED |
159 | struct tc_gact_p p_opt = { |
160 | .paction = gact->tcfg_paction, | |
161 | .pval = gact->tcfg_pval, | |
162 | .ptype = gact->tcfg_ptype, | |
163 | }; | |
164 | ||
1b34ec43 DM |
165 | if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt)) |
166 | goto nla_put_failure; | |
1da177e4 LT |
167 | } |
168 | #endif | |
e9ce1cd3 DM |
169 | t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install); |
170 | t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse); | |
171 | t.expires = jiffies_to_clock_t(gact->tcf_tm.expires); | |
1b34ec43 DM |
172 | if (nla_put(skb, TCA_GACT_TM, sizeof(t), &t)) |
173 | goto nla_put_failure; | |
1da177e4 LT |
174 | return skb->len; |
175 | ||
7ba699c6 | 176 | nla_put_failure: |
dc5fc579 | 177 | nlmsg_trim(skb, b); |
1da177e4 LT |
178 | return -1; |
179 | } | |
180 | ||
181 | static struct tc_action_ops act_gact_ops = { | |
182 | .kind = "gact", | |
e9ce1cd3 | 183 | .hinfo = &gact_hash_info, |
1da177e4 | 184 | .type = TCA_ACT_GACT, |
1da177e4 LT |
185 | .owner = THIS_MODULE, |
186 | .act = tcf_gact, | |
187 | .dump = tcf_gact_dump, | |
1da177e4 | 188 | .init = tcf_gact_init, |
1da177e4 LT |
189 | }; |
190 | ||
191 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); | |
192 | MODULE_DESCRIPTION("Generic Classifier actions"); | |
193 | MODULE_LICENSE("GPL"); | |
194 | ||
e9ce1cd3 | 195 | static int __init gact_init_module(void) |
1da177e4 | 196 | { |
568a153a | 197 | int err = tcf_hashinfo_init(&gact_hash_info, GACT_TAB_MASK); |
369ba567 WC |
198 | if (err) |
199 | return err; | |
1da177e4 | 200 | #ifdef CONFIG_GACT_PROB |
cc7ec456 | 201 | pr_info("GACT probability on\n"); |
1da177e4 | 202 | #else |
cc7ec456 | 203 | pr_info("GACT probability NOT on\n"); |
1da177e4 LT |
204 | #endif |
205 | return tcf_register_action(&act_gact_ops); | |
206 | } | |
207 | ||
e9ce1cd3 | 208 | static void __exit gact_cleanup_module(void) |
1da177e4 LT |
209 | { |
210 | tcf_unregister_action(&act_gact_ops); | |
369ba567 | 211 | tcf_hashinfo_destroy(&gact_hash_info); |
1da177e4 LT |
212 | } |
213 | ||
214 | module_init(gact_init_module); | |
215 | module_exit(gact_cleanup_module); |