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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
db753079 | 2 | /* |
0c6965dd | 3 | * net/sched/act_simple.c Simple example of an action |
db753079 | 4 | * |
fa1b1cff | 5 | * Authors: Jamal Hadi Salim (2005-8) |
db753079 JHS |
6 | */ |
7 | ||
cbdbf00a | 8 | #include <linux/module.h> |
5a0e3ad6 | 9 | #include <linux/slab.h> |
cbdbf00a | 10 | #include <linux/init.h> |
db753079 | 11 | #include <linux/kernel.h> |
db753079 JHS |
12 | #include <linux/skbuff.h> |
13 | #include <linux/rtnetlink.h> | |
dc5fc579 | 14 | #include <net/netlink.h> |
db753079 | 15 | #include <net/pkt_sched.h> |
4b006b0c | 16 | #include <net/pkt_cls.h> |
db753079 | 17 | |
db753079 JHS |
18 | #include <linux/tc_act/tc_defact.h> |
19 | #include <net/tc_act/tc_defact.h> | |
20 | ||
c7d03a00 | 21 | static unsigned int simp_net_id; |
a85a970a | 22 | static struct tc_action_ops act_simp_ops; |
ddf97ccd | 23 | |
fa1b1cff | 24 | #define SIMP_MAX_DATA 32 |
798de374 JHS |
25 | static int tcf_simp_act(struct sk_buff *skb, const struct tc_action *a, |
26 | struct tcf_result *res) | |
db753079 | 27 | { |
a85a970a | 28 | struct tcf_defact *d = to_defact(a); |
db753079 | 29 | |
e9ce1cd3 | 30 | spin_lock(&d->tcf_lock); |
9c4a4e48 | 31 | tcf_lastuse_update(&d->tcf_tm); |
bfe0d029 | 32 | bstats_update(&d->tcf_bstats, skb); |
db753079 | 33 | |
10297b99 YH |
34 | /* print policy string followed by _ then packet count |
35 | * Example if this was the 3rd packet and the string was "hello" | |
36 | * then it would look like "hello_3" (without quotes) | |
cc7ec456 | 37 | */ |
6ff9c364 | 38 | pr_info("simple: %s_%d\n", |
e9ce1cd3 DM |
39 | (char *)d->tcfd_defdata, d->tcf_bstats.packets); |
40 | spin_unlock(&d->tcf_lock); | |
41 | return d->tcf_action; | |
42 | } | |
43 | ||
9a63b255 | 44 | static void tcf_simp_release(struct tc_action *a) |
e9ce1cd3 | 45 | { |
86062033 | 46 | struct tcf_defact *d = to_defact(a); |
a5b5c958 | 47 | kfree(d->tcfd_defdata); |
e9ce1cd3 DM |
48 | } |
49 | ||
8d499533 | 50 | static int alloc_defdata(struct tcf_defact *d, const struct nlattr *defdata) |
e9ce1cd3 | 51 | { |
0eff683f | 52 | d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL); |
e9ce1cd3 DM |
53 | if (unlikely(!d->tcfd_defdata)) |
54 | return -ENOMEM; | |
8d499533 | 55 | nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); |
e9ce1cd3 DM |
56 | return 0; |
57 | } | |
58 | ||
4b006b0c DC |
59 | static int reset_policy(struct tc_action *a, const struct nlattr *defdata, |
60 | struct tc_defact *p, struct tcf_proto *tp, | |
61 | struct netlink_ext_ack *extack) | |
e9ce1cd3 | 62 | { |
4b006b0c DC |
63 | struct tcf_chain *goto_ch = NULL; |
64 | struct tcf_defact *d; | |
65 | int err; | |
66 | ||
67 | err = tcf_action_check_ctrlact(p->action, tp, &goto_ch, extack); | |
68 | if (err < 0) | |
69 | return err; | |
70 | d = to_defact(a); | |
9d1045ad | 71 | spin_lock_bh(&d->tcf_lock); |
4b006b0c | 72 | goto_ch = tcf_action_set_ctrlact(a, p->action, goto_ch); |
9d1045ad | 73 | memset(d->tcfd_defdata, 0, SIMP_MAX_DATA); |
8d499533 | 74 | nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); |
9d1045ad | 75 | spin_unlock_bh(&d->tcf_lock); |
4b006b0c DC |
76 | if (goto_ch) |
77 | tcf_chain_put_by_act(goto_ch); | |
78 | return 0; | |
e9ce1cd3 DM |
79 | } |
80 | ||
53b2bf3f PM |
81 | static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = { |
82 | [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) }, | |
fa1b1cff | 83 | [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA }, |
53b2bf3f PM |
84 | }; |
85 | ||
c1b52739 | 86 | static int tcf_simp_init(struct net *net, struct nlattr *nla, |
a85a970a | 87 | struct nlattr *est, struct tc_action **a, |
789871bb | 88 | int ovr, int bind, bool rtnl_held, |
85d0966f | 89 | struct tcf_proto *tp, struct netlink_ext_ack *extack) |
e9ce1cd3 | 90 | { |
ddf97ccd | 91 | struct tc_action_net *tn = net_generic(net, simp_net_id); |
7ba699c6 | 92 | struct nlattr *tb[TCA_DEF_MAX + 1]; |
4b006b0c | 93 | struct tcf_chain *goto_ch = NULL; |
e9ce1cd3 DM |
94 | struct tc_defact *parm; |
95 | struct tcf_defact *d; | |
b2313077 WC |
96 | bool exists = false; |
97 | int ret = 0, err; | |
e9ce1cd3 | 98 | |
cee63723 | 99 | if (nla == NULL) |
e9ce1cd3 DM |
100 | return -EINVAL; |
101 | ||
8cb08174 JB |
102 | err = nla_parse_nested_deprecated(tb, TCA_DEF_MAX, nla, simple_policy, |
103 | NULL); | |
cee63723 PM |
104 | if (err < 0) |
105 | return err; | |
106 | ||
53b2bf3f | 107 | if (tb[TCA_DEF_PARMS] == NULL) |
e9ce1cd3 DM |
108 | return -EINVAL; |
109 | ||
fa1b1cff | 110 | parm = nla_data(tb[TCA_DEF_PARMS]); |
0190c1d4 VB |
111 | err = tcf_idr_check_alloc(tn, &parm->index, a, bind); |
112 | if (err < 0) | |
113 | return err; | |
114 | exists = err; | |
0e5538ab JHS |
115 | if (exists && bind) |
116 | return 0; | |
117 | ||
118 | if (tb[TCA_DEF_DATA] == NULL) { | |
119 | if (exists) | |
65a206c0 | 120 | tcf_idr_release(*a, bind); |
0190c1d4 VB |
121 | else |
122 | tcf_idr_cleanup(tn, parm->index); | |
0e5538ab JHS |
123 | return -EINVAL; |
124 | } | |
125 | ||
0e5538ab | 126 | if (!exists) { |
65a206c0 CM |
127 | ret = tcf_idr_create(tn, parm->index, est, a, |
128 | &act_simp_ops, bind, false); | |
0190c1d4 VB |
129 | if (ret) { |
130 | tcf_idr_cleanup(tn, parm->index); | |
86062033 | 131 | return ret; |
0190c1d4 | 132 | } |
e9ce1cd3 | 133 | |
a85a970a | 134 | d = to_defact(*a); |
4b006b0c DC |
135 | err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, |
136 | extack); | |
137 | if (err < 0) | |
138 | goto release_idr; | |
139 | ||
140 | err = alloc_defdata(d, tb[TCA_DEF_DATA]); | |
141 | if (err < 0) | |
142 | goto put_chain; | |
143 | ||
144 | tcf_action_set_ctrlact(*a, parm->action, goto_ch); | |
e9ce1cd3 DM |
145 | ret = ACT_P_CREATED; |
146 | } else { | |
4e8ddd7f | 147 | if (!ovr) { |
4b006b0c DC |
148 | err = -EEXIST; |
149 | goto release_idr; | |
4e8ddd7f | 150 | } |
1a29321e | 151 | |
4b006b0c DC |
152 | err = reset_policy(*a, tb[TCA_DEF_DATA], parm, tp, extack); |
153 | if (err) | |
154 | goto release_idr; | |
e9ce1cd3 DM |
155 | } |
156 | ||
e9ce1cd3 | 157 | if (ret == ACT_P_CREATED) |
65a206c0 | 158 | tcf_idr_insert(tn, *a); |
e9ce1cd3 | 159 | return ret; |
4b006b0c DC |
160 | put_chain: |
161 | if (goto_ch) | |
162 | tcf_chain_put_by_act(goto_ch); | |
163 | release_idr: | |
164 | tcf_idr_release(*a, bind); | |
165 | return err; | |
e9ce1cd3 DM |
166 | } |
167 | ||
cc7ec456 ED |
168 | static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a, |
169 | int bind, int ref) | |
e9ce1cd3 | 170 | { |
27a884dc | 171 | unsigned char *b = skb_tail_pointer(skb); |
a85a970a | 172 | struct tcf_defact *d = to_defact(a); |
1c40be12 ED |
173 | struct tc_defact opt = { |
174 | .index = d->tcf_index, | |
036bb443 VB |
175 | .refcnt = refcount_read(&d->tcf_refcnt) - ref, |
176 | .bindcnt = atomic_read(&d->tcf_bindcnt) - bind, | |
1c40be12 | 177 | }; |
e9ce1cd3 DM |
178 | struct tcf_t t; |
179 | ||
5e48180e VB |
180 | spin_lock_bh(&d->tcf_lock); |
181 | opt.action = d->tcf_action; | |
1b34ec43 DM |
182 | if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) || |
183 | nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata)) | |
184 | goto nla_put_failure; | |
48d8ee16 JHS |
185 | |
186 | tcf_tm_dump(&t, &d->tcf_tm); | |
9854518e | 187 | if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD)) |
1b34ec43 | 188 | goto nla_put_failure; |
5e48180e VB |
189 | spin_unlock_bh(&d->tcf_lock); |
190 | ||
e9ce1cd3 DM |
191 | return skb->len; |
192 | ||
7ba699c6 | 193 | nla_put_failure: |
5e48180e | 194 | spin_unlock_bh(&d->tcf_lock); |
dc5fc579 | 195 | nlmsg_trim(skb, b); |
e9ce1cd3 | 196 | return -1; |
db753079 JHS |
197 | } |
198 | ||
ddf97ccd WC |
199 | static int tcf_simp_walker(struct net *net, struct sk_buff *skb, |
200 | struct netlink_callback *cb, int type, | |
41780105 AA |
201 | const struct tc_action_ops *ops, |
202 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
203 | { |
204 | struct tc_action_net *tn = net_generic(net, simp_net_id); | |
205 | ||
b3620145 | 206 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ddf97ccd WC |
207 | } |
208 | ||
f061b48c | 209 | static int tcf_simp_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
210 | { |
211 | struct tc_action_net *tn = net_generic(net, simp_net_id); | |
212 | ||
65a206c0 | 213 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
214 | } |
215 | ||
db753079 | 216 | static struct tc_action_ops act_simp_ops = { |
e9ce1cd3 | 217 | .kind = "simple", |
eddd2cf1 | 218 | .id = TCA_ID_SIMP, |
e9ce1cd3 | 219 | .owner = THIS_MODULE, |
798de374 | 220 | .act = tcf_simp_act, |
e9ce1cd3 | 221 | .dump = tcf_simp_dump, |
86062033 | 222 | .cleanup = tcf_simp_release, |
e9ce1cd3 | 223 | .init = tcf_simp_init, |
ddf97ccd WC |
224 | .walk = tcf_simp_walker, |
225 | .lookup = tcf_simp_search, | |
a85a970a | 226 | .size = sizeof(struct tcf_defact), |
ddf97ccd WC |
227 | }; |
228 | ||
229 | static __net_init int simp_init_net(struct net *net) | |
230 | { | |
231 | struct tc_action_net *tn = net_generic(net, simp_net_id); | |
232 | ||
c7e460ce | 233 | return tc_action_net_init(tn, &act_simp_ops); |
ddf97ccd WC |
234 | } |
235 | ||
039af9c6 | 236 | static void __net_exit simp_exit_net(struct list_head *net_list) |
ddf97ccd | 237 | { |
039af9c6 | 238 | tc_action_net_exit(net_list, simp_net_id); |
ddf97ccd WC |
239 | } |
240 | ||
241 | static struct pernet_operations simp_net_ops = { | |
242 | .init = simp_init_net, | |
039af9c6 | 243 | .exit_batch = simp_exit_net, |
ddf97ccd WC |
244 | .id = &simp_net_id, |
245 | .size = sizeof(struct tc_action_net), | |
db753079 JHS |
246 | }; |
247 | ||
248 | MODULE_AUTHOR("Jamal Hadi Salim(2005)"); | |
249 | MODULE_DESCRIPTION("Simple example action"); | |
250 | MODULE_LICENSE("GPL"); | |
251 | ||
252 | static int __init simp_init_module(void) | |
253 | { | |
ddf97ccd | 254 | int ret = tcf_register_action(&act_simp_ops, &simp_net_ops); |
db753079 | 255 | if (!ret) |
6ff9c364 | 256 | pr_info("Simple TC action Loaded\n"); |
db753079 JHS |
257 | return ret; |
258 | } | |
259 | ||
260 | static void __exit simp_cleanup_module(void) | |
261 | { | |
ddf97ccd | 262 | tcf_unregister_action(&act_simp_ops, &simp_net_ops); |
db753079 JHS |
263 | } |
264 | ||
265 | module_init(simp_init_module); | |
266 | module_exit(simp_cleanup_module); |