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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 | ||
db753079 JHS |
22 | #include <linux/tc_act/tc_defact.h> |
23 | #include <net/tc_act/tc_defact.h> | |
24 | ||
c7d03a00 | 25 | static unsigned int simp_net_id; |
a85a970a | 26 | static struct tc_action_ops act_simp_ops; |
ddf97ccd | 27 | |
fa1b1cff | 28 | #define SIMP_MAX_DATA 32 |
798de374 JHS |
29 | static int tcf_simp_act(struct sk_buff *skb, const struct tc_action *a, |
30 | struct tcf_result *res) | |
db753079 | 31 | { |
a85a970a | 32 | struct tcf_defact *d = to_defact(a); |
db753079 | 33 | |
e9ce1cd3 | 34 | spin_lock(&d->tcf_lock); |
9c4a4e48 | 35 | tcf_lastuse_update(&d->tcf_tm); |
bfe0d029 | 36 | bstats_update(&d->tcf_bstats, skb); |
db753079 | 37 | |
10297b99 YH |
38 | /* print policy string followed by _ then packet count |
39 | * Example if this was the 3rd packet and the string was "hello" | |
40 | * then it would look like "hello_3" (without quotes) | |
cc7ec456 | 41 | */ |
6ff9c364 | 42 | pr_info("simple: %s_%d\n", |
e9ce1cd3 DM |
43 | (char *)d->tcfd_defdata, d->tcf_bstats.packets); |
44 | spin_unlock(&d->tcf_lock); | |
45 | return d->tcf_action; | |
46 | } | |
47 | ||
9a63b255 | 48 | static void tcf_simp_release(struct tc_action *a) |
e9ce1cd3 | 49 | { |
86062033 | 50 | struct tcf_defact *d = to_defact(a); |
a5b5c958 | 51 | kfree(d->tcfd_defdata); |
e9ce1cd3 DM |
52 | } |
53 | ||
8d499533 | 54 | static int alloc_defdata(struct tcf_defact *d, const struct nlattr *defdata) |
e9ce1cd3 | 55 | { |
0eff683f | 56 | d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL); |
e9ce1cd3 DM |
57 | if (unlikely(!d->tcfd_defdata)) |
58 | return -ENOMEM; | |
8d499533 | 59 | nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); |
e9ce1cd3 DM |
60 | return 0; |
61 | } | |
62 | ||
8d499533 | 63 | static void reset_policy(struct tcf_defact *d, const struct nlattr *defdata, |
9d1045ad | 64 | struct tc_defact *p) |
e9ce1cd3 | 65 | { |
9d1045ad JHS |
66 | spin_lock_bh(&d->tcf_lock); |
67 | d->tcf_action = p->action; | |
68 | memset(d->tcfd_defdata, 0, SIMP_MAX_DATA); | |
8d499533 | 69 | nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); |
9d1045ad | 70 | spin_unlock_bh(&d->tcf_lock); |
e9ce1cd3 DM |
71 | } |
72 | ||
53b2bf3f PM |
73 | static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = { |
74 | [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) }, | |
fa1b1cff | 75 | [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA }, |
53b2bf3f PM |
76 | }; |
77 | ||
c1b52739 | 78 | static int tcf_simp_init(struct net *net, struct nlattr *nla, |
a85a970a | 79 | struct nlattr *est, struct tc_action **a, |
789871bb VB |
80 | int ovr, int bind, bool rtnl_held, |
81 | struct netlink_ext_ack *extack) | |
e9ce1cd3 | 82 | { |
ddf97ccd | 83 | struct tc_action_net *tn = net_generic(net, simp_net_id); |
7ba699c6 | 84 | struct nlattr *tb[TCA_DEF_MAX + 1]; |
e9ce1cd3 DM |
85 | struct tc_defact *parm; |
86 | struct tcf_defact *d; | |
b2313077 WC |
87 | bool exists = false; |
88 | int ret = 0, err; | |
e9ce1cd3 | 89 | |
cee63723 | 90 | if (nla == NULL) |
e9ce1cd3 DM |
91 | return -EINVAL; |
92 | ||
fceb6435 | 93 | err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy, NULL); |
cee63723 PM |
94 | if (err < 0) |
95 | return err; | |
96 | ||
53b2bf3f | 97 | if (tb[TCA_DEF_PARMS] == NULL) |
e9ce1cd3 DM |
98 | return -EINVAL; |
99 | ||
fa1b1cff | 100 | parm = nla_data(tb[TCA_DEF_PARMS]); |
0190c1d4 VB |
101 | err = tcf_idr_check_alloc(tn, &parm->index, a, bind); |
102 | if (err < 0) | |
103 | return err; | |
104 | exists = err; | |
0e5538ab JHS |
105 | if (exists && bind) |
106 | return 0; | |
107 | ||
108 | if (tb[TCA_DEF_DATA] == NULL) { | |
109 | if (exists) | |
65a206c0 | 110 | tcf_idr_release(*a, bind); |
0190c1d4 VB |
111 | else |
112 | tcf_idr_cleanup(tn, parm->index); | |
0e5538ab JHS |
113 | return -EINVAL; |
114 | } | |
115 | ||
0e5538ab | 116 | if (!exists) { |
65a206c0 CM |
117 | ret = tcf_idr_create(tn, parm->index, est, a, |
118 | &act_simp_ops, bind, false); | |
0190c1d4 VB |
119 | if (ret) { |
120 | tcf_idr_cleanup(tn, parm->index); | |
86062033 | 121 | return ret; |
0190c1d4 | 122 | } |
e9ce1cd3 | 123 | |
a85a970a | 124 | d = to_defact(*a); |
8d499533 | 125 | ret = alloc_defdata(d, tb[TCA_DEF_DATA]); |
e9ce1cd3 | 126 | if (ret < 0) { |
60e10b3a | 127 | tcf_idr_release(*a, bind); |
e9ce1cd3 DM |
128 | return ret; |
129 | } | |
9d1045ad | 130 | d->tcf_action = parm->action; |
e9ce1cd3 DM |
131 | ret = ACT_P_CREATED; |
132 | } else { | |
a85a970a | 133 | d = to_defact(*a); |
1a29321e | 134 | |
4e8ddd7f VB |
135 | if (!ovr) { |
136 | tcf_idr_release(*a, bind); | |
e9ce1cd3 | 137 | return -EEXIST; |
4e8ddd7f | 138 | } |
1a29321e | 139 | |
8d499533 | 140 | reset_policy(d, tb[TCA_DEF_DATA], parm); |
e9ce1cd3 DM |
141 | } |
142 | ||
e9ce1cd3 | 143 | if (ret == ACT_P_CREATED) |
65a206c0 | 144 | tcf_idr_insert(tn, *a); |
e9ce1cd3 DM |
145 | return ret; |
146 | } | |
147 | ||
cc7ec456 ED |
148 | static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a, |
149 | int bind, int ref) | |
e9ce1cd3 | 150 | { |
27a884dc | 151 | unsigned char *b = skb_tail_pointer(skb); |
a85a970a | 152 | struct tcf_defact *d = to_defact(a); |
1c40be12 ED |
153 | struct tc_defact opt = { |
154 | .index = d->tcf_index, | |
036bb443 VB |
155 | .refcnt = refcount_read(&d->tcf_refcnt) - ref, |
156 | .bindcnt = atomic_read(&d->tcf_bindcnt) - bind, | |
1c40be12 | 157 | }; |
e9ce1cd3 DM |
158 | struct tcf_t t; |
159 | ||
5e48180e VB |
160 | spin_lock_bh(&d->tcf_lock); |
161 | opt.action = d->tcf_action; | |
1b34ec43 DM |
162 | if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) || |
163 | nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata)) | |
164 | goto nla_put_failure; | |
48d8ee16 JHS |
165 | |
166 | tcf_tm_dump(&t, &d->tcf_tm); | |
9854518e | 167 | if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD)) |
1b34ec43 | 168 | goto nla_put_failure; |
5e48180e VB |
169 | spin_unlock_bh(&d->tcf_lock); |
170 | ||
e9ce1cd3 DM |
171 | return skb->len; |
172 | ||
7ba699c6 | 173 | nla_put_failure: |
5e48180e | 174 | spin_unlock_bh(&d->tcf_lock); |
dc5fc579 | 175 | nlmsg_trim(skb, b); |
e9ce1cd3 | 176 | return -1; |
db753079 JHS |
177 | } |
178 | ||
ddf97ccd WC |
179 | static int tcf_simp_walker(struct net *net, struct sk_buff *skb, |
180 | struct netlink_callback *cb, int type, | |
41780105 AA |
181 | const struct tc_action_ops *ops, |
182 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
183 | { |
184 | struct tc_action_net *tn = net_generic(net, simp_net_id); | |
185 | ||
b3620145 | 186 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ddf97ccd WC |
187 | } |
188 | ||
f061b48c | 189 | static int tcf_simp_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
190 | { |
191 | struct tc_action_net *tn = net_generic(net, simp_net_id); | |
192 | ||
65a206c0 | 193 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
194 | } |
195 | ||
db753079 | 196 | static struct tc_action_ops act_simp_ops = { |
e9ce1cd3 | 197 | .kind = "simple", |
e9ce1cd3 | 198 | .type = TCA_ACT_SIMP, |
e9ce1cd3 | 199 | .owner = THIS_MODULE, |
798de374 | 200 | .act = tcf_simp_act, |
e9ce1cd3 | 201 | .dump = tcf_simp_dump, |
86062033 | 202 | .cleanup = tcf_simp_release, |
e9ce1cd3 | 203 | .init = tcf_simp_init, |
ddf97ccd WC |
204 | .walk = tcf_simp_walker, |
205 | .lookup = tcf_simp_search, | |
a85a970a | 206 | .size = sizeof(struct tcf_defact), |
ddf97ccd WC |
207 | }; |
208 | ||
209 | static __net_init int simp_init_net(struct net *net) | |
210 | { | |
211 | struct tc_action_net *tn = net_generic(net, simp_net_id); | |
212 | ||
c7e460ce | 213 | return tc_action_net_init(tn, &act_simp_ops); |
ddf97ccd WC |
214 | } |
215 | ||
039af9c6 | 216 | static void __net_exit simp_exit_net(struct list_head *net_list) |
ddf97ccd | 217 | { |
039af9c6 | 218 | tc_action_net_exit(net_list, simp_net_id); |
ddf97ccd WC |
219 | } |
220 | ||
221 | static struct pernet_operations simp_net_ops = { | |
222 | .init = simp_init_net, | |
039af9c6 | 223 | .exit_batch = simp_exit_net, |
ddf97ccd WC |
224 | .id = &simp_net_id, |
225 | .size = sizeof(struct tc_action_net), | |
db753079 JHS |
226 | }; |
227 | ||
228 | MODULE_AUTHOR("Jamal Hadi Salim(2005)"); | |
229 | MODULE_DESCRIPTION("Simple example action"); | |
230 | MODULE_LICENSE("GPL"); | |
231 | ||
232 | static int __init simp_init_module(void) | |
233 | { | |
ddf97ccd | 234 | int ret = tcf_register_action(&act_simp_ops, &simp_net_ops); |
db753079 | 235 | if (!ret) |
6ff9c364 | 236 | pr_info("Simple TC action Loaded\n"); |
db753079 JHS |
237 | return ret; |
238 | } | |
239 | ||
240 | static void __exit simp_cleanup_module(void) | |
241 | { | |
ddf97ccd | 242 | tcf_unregister_action(&act_simp_ops, &simp_net_ops); |
db753079 JHS |
243 | } |
244 | ||
245 | module_init(simp_init_module); | |
246 | module_exit(simp_cleanup_module); |