Commit | Line | Data |
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db753079 JHS |
1 | /* |
2 | * net/sched/simp.c Simple example of an action | |
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 | * | |
fa1b1cff | 9 | * Authors: Jamal Hadi Salim (2005-8) |
db753079 JHS |
10 | * |
11 | */ | |
12 | ||
cbdbf00a DM |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
db753079 | 15 | #include <linux/kernel.h> |
db753079 JHS |
16 | #include <linux/skbuff.h> |
17 | #include <linux/rtnetlink.h> | |
dc5fc579 | 18 | #include <net/netlink.h> |
db753079 JHS |
19 | #include <net/pkt_sched.h> |
20 | ||
21 | #define TCA_ACT_SIMP 22 | |
22 | ||
db753079 JHS |
23 | #include <linux/tc_act/tc_defact.h> |
24 | #include <net/tc_act/tc_defact.h> | |
25 | ||
e9ce1cd3 DM |
26 | #define SIMP_TAB_MASK 7 |
27 | static struct tcf_common *tcf_simp_ht[SIMP_TAB_MASK + 1]; | |
28 | static u32 simp_idx_gen; | |
db753079 JHS |
29 | static DEFINE_RWLOCK(simp_lock); |
30 | ||
28a7b327 | 31 | static struct tcf_hashinfo simp_hash_info = { |
e9ce1cd3 DM |
32 | .htab = tcf_simp_ht, |
33 | .hmask = SIMP_TAB_MASK, | |
34 | .lock = &simp_lock, | |
35 | }; | |
db753079 | 36 | |
fa1b1cff | 37 | #define SIMP_MAX_DATA 32 |
f43c5a0d | 38 | static int tcf_simp(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res) |
db753079 | 39 | { |
e9ce1cd3 | 40 | struct tcf_defact *d = a->priv; |
db753079 | 41 | |
e9ce1cd3 DM |
42 | spin_lock(&d->tcf_lock); |
43 | d->tcf_tm.lastuse = jiffies; | |
0abf77e5 | 44 | d->tcf_bstats.bytes += qdisc_pkt_len(skb); |
e9ce1cd3 | 45 | d->tcf_bstats.packets++; |
db753079 | 46 | |
10297b99 YH |
47 | /* print policy string followed by _ then packet count |
48 | * Example if this was the 3rd packet and the string was "hello" | |
49 | * then it would look like "hello_3" (without quotes) | |
db753079 | 50 | **/ |
e9ce1cd3 DM |
51 | printk("simple: %s_%d\n", |
52 | (char *)d->tcfd_defdata, d->tcf_bstats.packets); | |
53 | spin_unlock(&d->tcf_lock); | |
54 | return d->tcf_action; | |
55 | } | |
56 | ||
57 | static int tcf_simp_release(struct tcf_defact *d, int bind) | |
58 | { | |
59 | int ret = 0; | |
60 | if (d) { | |
61 | if (bind) | |
62 | d->tcf_bindcnt--; | |
63 | d->tcf_refcnt--; | |
64 | if (d->tcf_bindcnt <= 0 && d->tcf_refcnt <= 0) { | |
65 | kfree(d->tcfd_defdata); | |
66 | tcf_hash_destroy(&d->common, &simp_hash_info); | |
67 | ret = 1; | |
68 | } | |
69 | } | |
70 | return ret; | |
71 | } | |
72 | ||
fa1b1cff | 73 | static int alloc_defdata(struct tcf_defact *d, char *defdata) |
e9ce1cd3 | 74 | { |
fa1b1cff | 75 | d->tcfd_defdata = kstrndup(defdata, SIMP_MAX_DATA, GFP_KERNEL); |
e9ce1cd3 DM |
76 | if (unlikely(!d->tcfd_defdata)) |
77 | return -ENOMEM; | |
fa1b1cff | 78 | |
e9ce1cd3 DM |
79 | return 0; |
80 | } | |
81 | ||
9d1045ad JHS |
82 | static void reset_policy(struct tcf_defact *d, char *defdata, |
83 | struct tc_defact *p) | |
e9ce1cd3 | 84 | { |
9d1045ad JHS |
85 | spin_lock_bh(&d->tcf_lock); |
86 | d->tcf_action = p->action; | |
87 | memset(d->tcfd_defdata, 0, SIMP_MAX_DATA); | |
88 | strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); | |
89 | spin_unlock_bh(&d->tcf_lock); | |
e9ce1cd3 DM |
90 | } |
91 | ||
53b2bf3f PM |
92 | static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = { |
93 | [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) }, | |
fa1b1cff | 94 | [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA }, |
53b2bf3f PM |
95 | }; |
96 | ||
7ba699c6 | 97 | static int tcf_simp_init(struct nlattr *nla, struct nlattr *est, |
e9ce1cd3 DM |
98 | struct tc_action *a, int ovr, int bind) |
99 | { | |
7ba699c6 | 100 | struct nlattr *tb[TCA_DEF_MAX + 1]; |
e9ce1cd3 DM |
101 | struct tc_defact *parm; |
102 | struct tcf_defact *d; | |
103 | struct tcf_common *pc; | |
fa1b1cff | 104 | char *defdata; |
cee63723 | 105 | int ret = 0, err; |
e9ce1cd3 | 106 | |
cee63723 | 107 | if (nla == NULL) |
e9ce1cd3 DM |
108 | return -EINVAL; |
109 | ||
fa1b1cff | 110 | err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy); |
cee63723 PM |
111 | if (err < 0) |
112 | return err; | |
113 | ||
53b2bf3f | 114 | if (tb[TCA_DEF_PARMS] == NULL) |
e9ce1cd3 DM |
115 | return -EINVAL; |
116 | ||
fa1b1cff | 117 | if (tb[TCA_DEF_DATA] == NULL) |
e9ce1cd3 DM |
118 | return -EINVAL; |
119 | ||
fa1b1cff JHS |
120 | parm = nla_data(tb[TCA_DEF_PARMS]); |
121 | defdata = nla_data(tb[TCA_DEF_DATA]); | |
e9ce1cd3 DM |
122 | |
123 | pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info); | |
124 | if (!pc) { | |
125 | pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind, | |
126 | &simp_idx_gen, &simp_hash_info); | |
127 | if (unlikely(!pc)) | |
128 | return -ENOMEM; | |
129 | ||
130 | d = to_defact(pc); | |
fa1b1cff | 131 | ret = alloc_defdata(d, defdata); |
e9ce1cd3 DM |
132 | if (ret < 0) { |
133 | kfree(pc); | |
134 | return ret; | |
135 | } | |
9d1045ad | 136 | d->tcf_action = parm->action; |
e9ce1cd3 DM |
137 | ret = ACT_P_CREATED; |
138 | } else { | |
139 | d = to_defact(pc); | |
140 | if (!ovr) { | |
141 | tcf_simp_release(d, bind); | |
142 | return -EEXIST; | |
143 | } | |
9d1045ad | 144 | reset_policy(d, defdata, parm); |
e9ce1cd3 DM |
145 | } |
146 | ||
e9ce1cd3 DM |
147 | if (ret == ACT_P_CREATED) |
148 | tcf_hash_insert(pc, &simp_hash_info); | |
149 | return ret; | |
150 | } | |
151 | ||
152 | static inline int tcf_simp_cleanup(struct tc_action *a, int bind) | |
153 | { | |
154 | struct tcf_defact *d = a->priv; | |
155 | ||
156 | if (d) | |
157 | return tcf_simp_release(d, bind); | |
158 | return 0; | |
159 | } | |
160 | ||
161 | static inline int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a, | |
162 | int bind, int ref) | |
163 | { | |
27a884dc | 164 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 DM |
165 | struct tcf_defact *d = a->priv; |
166 | struct tc_defact opt; | |
167 | struct tcf_t t; | |
168 | ||
169 | opt.index = d->tcf_index; | |
170 | opt.refcnt = d->tcf_refcnt - ref; | |
171 | opt.bindcnt = d->tcf_bindcnt - bind; | |
172 | opt.action = d->tcf_action; | |
7ba699c6 | 173 | NLA_PUT(skb, TCA_DEF_PARMS, sizeof(opt), &opt); |
fa1b1cff | 174 | NLA_PUT_STRING(skb, TCA_DEF_DATA, d->tcfd_defdata); |
e9ce1cd3 DM |
175 | t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install); |
176 | t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse); | |
177 | t.expires = jiffies_to_clock_t(d->tcf_tm.expires); | |
7ba699c6 | 178 | NLA_PUT(skb, TCA_DEF_TM, sizeof(t), &t); |
e9ce1cd3 DM |
179 | return skb->len; |
180 | ||
7ba699c6 | 181 | nla_put_failure: |
dc5fc579 | 182 | nlmsg_trim(skb, b); |
e9ce1cd3 | 183 | return -1; |
db753079 JHS |
184 | } |
185 | ||
186 | static struct tc_action_ops act_simp_ops = { | |
e9ce1cd3 DM |
187 | .kind = "simple", |
188 | .hinfo = &simp_hash_info, | |
189 | .type = TCA_ACT_SIMP, | |
190 | .capab = TCA_CAP_NONE, | |
191 | .owner = THIS_MODULE, | |
192 | .act = tcf_simp, | |
193 | .dump = tcf_simp_dump, | |
194 | .cleanup = tcf_simp_cleanup, | |
195 | .init = tcf_simp_init, | |
196 | .walk = tcf_generic_walker, | |
db753079 JHS |
197 | }; |
198 | ||
199 | MODULE_AUTHOR("Jamal Hadi Salim(2005)"); | |
200 | MODULE_DESCRIPTION("Simple example action"); | |
201 | MODULE_LICENSE("GPL"); | |
202 | ||
203 | static int __init simp_init_module(void) | |
204 | { | |
205 | int ret = tcf_register_action(&act_simp_ops); | |
206 | if (!ret) | |
207 | printk("Simple TC action Loaded\n"); | |
208 | return ret; | |
209 | } | |
210 | ||
211 | static void __exit simp_cleanup_module(void) | |
212 | { | |
213 | tcf_unregister_action(&act_simp_ops); | |
214 | } | |
215 | ||
216 | module_init(simp_init_module); | |
217 | module_exit(simp_cleanup_module); |