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