Commit | Line | Data |
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db753079 | 1 | /* |
0c6965dd | 2 | * net/sched/act_simple.c Simple example of an action |
db753079 JHS |
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 | 13 | #include <linux/module.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
cbdbf00a | 15 | #include <linux/init.h> |
db753079 | 16 | #include <linux/kernel.h> |
db753079 JHS |
17 | #include <linux/skbuff.h> |
18 | #include <linux/rtnetlink.h> | |
dc5fc579 | 19 | #include <net/netlink.h> |
db753079 JHS |
20 | #include <net/pkt_sched.h> |
21 | ||
22 | #define TCA_ACT_SIMP 22 | |
23 | ||
db753079 JHS |
24 | #include <linux/tc_act/tc_defact.h> |
25 | #include <net/tc_act/tc_defact.h> | |
26 | ||
e9ce1cd3 | 27 | #define SIMP_TAB_MASK 7 |
db753079 | 28 | |
fa1b1cff | 29 | #define SIMP_MAX_DATA 32 |
dc7f9f6e ED |
30 | static int tcf_simp(struct sk_buff *skb, const struct tc_action *a, |
31 | struct tcf_result *res) | |
db753079 | 32 | { |
e9ce1cd3 | 33 | struct tcf_defact *d = a->priv; |
db753079 | 34 | |
e9ce1cd3 DM |
35 | spin_lock(&d->tcf_lock); |
36 | d->tcf_tm.lastuse = jiffies; | |
bfe0d029 | 37 | bstats_update(&d->tcf_bstats, skb); |
db753079 | 38 | |
10297b99 YH |
39 | /* print policy string followed by _ then packet count |
40 | * Example if this was the 3rd packet and the string was "hello" | |
41 | * then it would look like "hello_3" (without quotes) | |
cc7ec456 | 42 | */ |
6ff9c364 | 43 | pr_info("simple: %s_%d\n", |
e9ce1cd3 DM |
44 | (char *)d->tcfd_defdata, d->tcf_bstats.packets); |
45 | spin_unlock(&d->tcf_lock); | |
46 | return d->tcf_action; | |
47 | } | |
48 | ||
a5b5c958 | 49 | static void tcf_simp_release(struct tc_action *a, int bind) |
e9ce1cd3 | 50 | { |
86062033 | 51 | struct tcf_defact *d = to_defact(a); |
a5b5c958 | 52 | kfree(d->tcfd_defdata); |
e9ce1cd3 DM |
53 | } |
54 | ||
fa1b1cff | 55 | static int alloc_defdata(struct tcf_defact *d, char *defdata) |
e9ce1cd3 | 56 | { |
0eff683f | 57 | d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL); |
e9ce1cd3 DM |
58 | if (unlikely(!d->tcfd_defdata)) |
59 | return -ENOMEM; | |
0eff683f | 60 | strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); |
e9ce1cd3 DM |
61 | return 0; |
62 | } | |
63 | ||
9d1045ad JHS |
64 | static void reset_policy(struct tcf_defact *d, char *defdata, |
65 | struct tc_defact *p) | |
e9ce1cd3 | 66 | { |
9d1045ad JHS |
67 | spin_lock_bh(&d->tcf_lock); |
68 | d->tcf_action = p->action; | |
69 | memset(d->tcfd_defdata, 0, SIMP_MAX_DATA); | |
70 | strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); | |
71 | spin_unlock_bh(&d->tcf_lock); | |
e9ce1cd3 DM |
72 | } |
73 | ||
53b2bf3f PM |
74 | static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = { |
75 | [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) }, | |
fa1b1cff | 76 | [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA }, |
53b2bf3f PM |
77 | }; |
78 | ||
c1b52739 BL |
79 | static int tcf_simp_init(struct net *net, struct nlattr *nla, |
80 | struct nlattr *est, struct tc_action *a, | |
81 | int ovr, int bind) | |
e9ce1cd3 | 82 | { |
7ba699c6 | 83 | struct nlattr *tb[TCA_DEF_MAX + 1]; |
e9ce1cd3 DM |
84 | struct tc_defact *parm; |
85 | struct tcf_defact *d; | |
fa1b1cff | 86 | char *defdata; |
cee63723 | 87 | int ret = 0, err; |
e9ce1cd3 | 88 | |
cee63723 | 89 | if (nla == NULL) |
e9ce1cd3 DM |
90 | return -EINVAL; |
91 | ||
fa1b1cff | 92 | err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy); |
cee63723 PM |
93 | if (err < 0) |
94 | return err; | |
95 | ||
53b2bf3f | 96 | if (tb[TCA_DEF_PARMS] == NULL) |
e9ce1cd3 DM |
97 | return -EINVAL; |
98 | ||
fa1b1cff | 99 | if (tb[TCA_DEF_DATA] == NULL) |
e9ce1cd3 DM |
100 | return -EINVAL; |
101 | ||
fa1b1cff JHS |
102 | parm = nla_data(tb[TCA_DEF_PARMS]); |
103 | defdata = nla_data(tb[TCA_DEF_DATA]); | |
e9ce1cd3 | 104 | |
86062033 | 105 | if (!tcf_hash_check(parm->index, a, bind)) { |
519c818e ED |
106 | ret = tcf_hash_create(parm->index, est, a, sizeof(*d), |
107 | bind, false); | |
86062033 WC |
108 | if (ret) |
109 | return ret; | |
e9ce1cd3 | 110 | |
86062033 | 111 | d = to_defact(a); |
fa1b1cff | 112 | ret = alloc_defdata(d, defdata); |
e9ce1cd3 | 113 | if (ret < 0) { |
86062033 | 114 | tcf_hash_cleanup(a, est); |
e9ce1cd3 DM |
115 | return ret; |
116 | } | |
9d1045ad | 117 | d->tcf_action = parm->action; |
e9ce1cd3 DM |
118 | ret = ACT_P_CREATED; |
119 | } else { | |
86062033 | 120 | d = to_defact(a); |
1a29321e JHS |
121 | |
122 | if (bind) | |
123 | return 0; | |
a5b5c958 | 124 | tcf_hash_release(a, bind); |
1a29321e | 125 | if (!ovr) |
e9ce1cd3 | 126 | return -EEXIST; |
1a29321e | 127 | |
9d1045ad | 128 | reset_policy(d, defdata, parm); |
e9ce1cd3 DM |
129 | } |
130 | ||
e9ce1cd3 | 131 | if (ret == ACT_P_CREATED) |
86062033 | 132 | tcf_hash_insert(a); |
e9ce1cd3 DM |
133 | return ret; |
134 | } | |
135 | ||
cc7ec456 ED |
136 | static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a, |
137 | int bind, int ref) | |
e9ce1cd3 | 138 | { |
27a884dc | 139 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 140 | struct tcf_defact *d = a->priv; |
1c40be12 ED |
141 | struct tc_defact opt = { |
142 | .index = d->tcf_index, | |
143 | .refcnt = d->tcf_refcnt - ref, | |
144 | .bindcnt = d->tcf_bindcnt - bind, | |
145 | .action = d->tcf_action, | |
146 | }; | |
e9ce1cd3 DM |
147 | struct tcf_t t; |
148 | ||
1b34ec43 DM |
149 | if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) || |
150 | nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata)) | |
151 | goto nla_put_failure; | |
e9ce1cd3 DM |
152 | t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install); |
153 | t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse); | |
154 | t.expires = jiffies_to_clock_t(d->tcf_tm.expires); | |
1b34ec43 DM |
155 | if (nla_put(skb, TCA_DEF_TM, sizeof(t), &t)) |
156 | goto nla_put_failure; | |
e9ce1cd3 DM |
157 | return skb->len; |
158 | ||
7ba699c6 | 159 | nla_put_failure: |
dc5fc579 | 160 | nlmsg_trim(skb, b); |
e9ce1cd3 | 161 | return -1; |
db753079 JHS |
162 | } |
163 | ||
164 | static struct tc_action_ops act_simp_ops = { | |
e9ce1cd3 | 165 | .kind = "simple", |
e9ce1cd3 | 166 | .type = TCA_ACT_SIMP, |
e9ce1cd3 DM |
167 | .owner = THIS_MODULE, |
168 | .act = tcf_simp, | |
169 | .dump = tcf_simp_dump, | |
86062033 | 170 | .cleanup = tcf_simp_release, |
e9ce1cd3 | 171 | .init = tcf_simp_init, |
db753079 JHS |
172 | }; |
173 | ||
174 | MODULE_AUTHOR("Jamal Hadi Salim(2005)"); | |
175 | MODULE_DESCRIPTION("Simple example action"); | |
176 | MODULE_LICENSE("GPL"); | |
177 | ||
178 | static int __init simp_init_module(void) | |
179 | { | |
4f1e9d89 WC |
180 | int ret; |
181 | ret = tcf_register_action(&act_simp_ops, SIMP_TAB_MASK); | |
db753079 | 182 | if (!ret) |
6ff9c364 | 183 | pr_info("Simple TC action Loaded\n"); |
db753079 JHS |
184 | return ret; |
185 | } | |
186 | ||
187 | static void __exit simp_cleanup_module(void) | |
188 | { | |
189 | tcf_unregister_action(&act_simp_ops); | |
190 | } | |
191 | ||
192 | module_init(simp_init_module); | |
193 | module_exit(simp_cleanup_module); |