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9952f691 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ca9b0e27 AD |
2 | /* |
3 | * Copyright (c) 2008, Intel Corporation. | |
4 | * | |
ca9b0e27 AD |
5 | * Author: Alexander Duyck <alexander.h.duyck@intel.com> |
6 | */ | |
7 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/skbuff.h> | |
12 | #include <linux/rtnetlink.h> | |
13 | #include <net/netlink.h> | |
14 | #include <net/pkt_sched.h> | |
e7e3728b QF |
15 | #include <net/ip.h> |
16 | #include <net/ipv6.h> | |
17 | #include <net/dsfield.h> | |
ec7727bb | 18 | #include <net/pkt_cls.h> |
ca9b0e27 AD |
19 | |
20 | #include <linux/tc_act/tc_skbedit.h> | |
21 | #include <net/tc_act/tc_skbedit.h> | |
22 | ||
c7d03a00 | 23 | static unsigned int skbedit_net_id; |
a85a970a | 24 | static struct tc_action_ops act_skbedit_ops; |
ddf97ccd | 25 | |
45da1dac JHS |
26 | static int tcf_skbedit_act(struct sk_buff *skb, const struct tc_action *a, |
27 | struct tcf_result *res) | |
ca9b0e27 | 28 | { |
a85a970a | 29 | struct tcf_skbedit *d = to_skbedit(a); |
c749cdda DC |
30 | struct tcf_skbedit_params *params; |
31 | int action; | |
ca9b0e27 | 32 | |
9c4a4e48 | 33 | tcf_lastuse_update(&d->tcf_tm); |
6f3dfb0d | 34 | bstats_cpu_update(this_cpu_ptr(d->common.cpu_bstats), skb); |
ca9b0e27 | 35 | |
7fd4b288 | 36 | params = rcu_dereference_bh(d->params); |
c749cdda DC |
37 | action = READ_ONCE(d->tcf_action); |
38 | ||
39 | if (params->flags & SKBEDIT_F_PRIORITY) | |
40 | skb->priority = params->priority; | |
41 | if (params->flags & SKBEDIT_F_INHERITDSFIELD) { | |
e7e3728b QF |
42 | int wlen = skb_network_offset(skb); |
43 | ||
44 | switch (tc_skb_protocol(skb)) { | |
45 | case htons(ETH_P_IP): | |
46 | wlen += sizeof(struct iphdr); | |
47 | if (!pskb_may_pull(skb, wlen)) | |
48 | goto err; | |
49 | skb->priority = ipv4_get_dsfield(ip_hdr(skb)) >> 2; | |
50 | break; | |
51 | ||
52 | case htons(ETH_P_IPV6): | |
53 | wlen += sizeof(struct ipv6hdr); | |
54 | if (!pskb_may_pull(skb, wlen)) | |
55 | goto err; | |
56 | skb->priority = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2; | |
57 | break; | |
58 | } | |
59 | } | |
c749cdda DC |
60 | if (params->flags & SKBEDIT_F_QUEUE_MAPPING && |
61 | skb->dev->real_num_tx_queues > params->queue_mapping) | |
62 | skb_set_queue_mapping(skb, params->queue_mapping); | |
63 | if (params->flags & SKBEDIT_F_MARK) { | |
64 | skb->mark &= ~params->mask; | |
65 | skb->mark |= params->mark & params->mask; | |
4fe77d82 | 66 | } |
c749cdda DC |
67 | if (params->flags & SKBEDIT_F_PTYPE) |
68 | skb->pkt_type = params->ptype; | |
c749cdda | 69 | return action; |
7fd4b288 | 70 | |
e7e3728b | 71 | err: |
6f3dfb0d | 72 | qstats_drop_inc(this_cpu_ptr(d->common.cpu_qstats)); |
7fd4b288 | 73 | return TC_ACT_SHOT; |
ca9b0e27 AD |
74 | } |
75 | ||
76 | static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = { | |
77 | [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) }, | |
78 | [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) }, | |
79 | [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) }, | |
1c55d62e | 80 | [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) }, |
ff202ee1 | 81 | [TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) }, |
4fe77d82 | 82 | [TCA_SKBEDIT_MASK] = { .len = sizeof(u32) }, |
e7e3728b | 83 | [TCA_SKBEDIT_FLAGS] = { .len = sizeof(u64) }, |
ca9b0e27 AD |
84 | }; |
85 | ||
c1b52739 | 86 | static int tcf_skbedit_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, |
789871bb | 90 | struct netlink_ext_ack *extack) |
ca9b0e27 | 91 | { |
ddf97ccd | 92 | struct tc_action_net *tn = net_generic(net, skbedit_net_id); |
6d7a8df6 | 93 | struct tcf_skbedit_params *params_new; |
ca9b0e27 | 94 | struct nlattr *tb[TCA_SKBEDIT_MAX + 1]; |
ec7727bb | 95 | struct tcf_chain *goto_ch = NULL; |
ca9b0e27 AD |
96 | struct tc_skbedit *parm; |
97 | struct tcf_skbedit *d; | |
4fe77d82 | 98 | u32 flags = 0, *priority = NULL, *mark = NULL, *mask = NULL; |
ff202ee1 | 99 | u16 *queue_mapping = NULL, *ptype = NULL; |
b2313077 WC |
100 | bool exists = false; |
101 | int ret = 0, err; | |
ca9b0e27 AD |
102 | |
103 | if (nla == NULL) | |
104 | return -EINVAL; | |
105 | ||
8cb08174 JB |
106 | err = nla_parse_nested_deprecated(tb, TCA_SKBEDIT_MAX, nla, |
107 | skbedit_policy, NULL); | |
ca9b0e27 AD |
108 | if (err < 0) |
109 | return err; | |
110 | ||
111 | if (tb[TCA_SKBEDIT_PARMS] == NULL) | |
112 | return -EINVAL; | |
113 | ||
114 | if (tb[TCA_SKBEDIT_PRIORITY] != NULL) { | |
115 | flags |= SKBEDIT_F_PRIORITY; | |
116 | priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]); | |
117 | } | |
118 | ||
119 | if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) { | |
120 | flags |= SKBEDIT_F_QUEUE_MAPPING; | |
121 | queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]); | |
122 | } | |
1c55d62e | 123 | |
ff202ee1 JHS |
124 | if (tb[TCA_SKBEDIT_PTYPE] != NULL) { |
125 | ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]); | |
126 | if (!skb_pkt_type_ok(*ptype)) | |
127 | return -EINVAL; | |
128 | flags |= SKBEDIT_F_PTYPE; | |
129 | } | |
130 | ||
1c55d62e | 131 | if (tb[TCA_SKBEDIT_MARK] != NULL) { |
132 | flags |= SKBEDIT_F_MARK; | |
133 | mark = nla_data(tb[TCA_SKBEDIT_MARK]); | |
134 | } | |
135 | ||
4fe77d82 AQ |
136 | if (tb[TCA_SKBEDIT_MASK] != NULL) { |
137 | flags |= SKBEDIT_F_MASK; | |
138 | mask = nla_data(tb[TCA_SKBEDIT_MASK]); | |
139 | } | |
140 | ||
e7e3728b QF |
141 | if (tb[TCA_SKBEDIT_FLAGS] != NULL) { |
142 | u64 *pure_flags = nla_data(tb[TCA_SKBEDIT_FLAGS]); | |
143 | ||
144 | if (*pure_flags & SKBEDIT_F_INHERITDSFIELD) | |
145 | flags |= SKBEDIT_F_INHERITDSFIELD; | |
146 | } | |
147 | ||
ca9b0e27 AD |
148 | parm = nla_data(tb[TCA_SKBEDIT_PARMS]); |
149 | ||
0190c1d4 VB |
150 | err = tcf_idr_check_alloc(tn, &parm->index, a, bind); |
151 | if (err < 0) | |
152 | return err; | |
153 | exists = err; | |
5e1567ae JHS |
154 | if (exists && bind) |
155 | return 0; | |
156 | ||
157 | if (!flags) { | |
af5d0184 RM |
158 | if (exists) |
159 | tcf_idr_release(*a, bind); | |
0190c1d4 VB |
160 | else |
161 | tcf_idr_cleanup(tn, parm->index); | |
5e1567ae JHS |
162 | return -EINVAL; |
163 | } | |
164 | ||
165 | if (!exists) { | |
65a206c0 | 166 | ret = tcf_idr_create(tn, parm->index, est, a, |
6f3dfb0d | 167 | &act_skbedit_ops, bind, true); |
0190c1d4 VB |
168 | if (ret) { |
169 | tcf_idr_cleanup(tn, parm->index); | |
86062033 | 170 | return ret; |
0190c1d4 | 171 | } |
ca9b0e27 | 172 | |
a85a970a | 173 | d = to_skbedit(*a); |
ca9b0e27 AD |
174 | ret = ACT_P_CREATED; |
175 | } else { | |
a85a970a | 176 | d = to_skbedit(*a); |
4e8ddd7f VB |
177 | if (!ovr) { |
178 | tcf_idr_release(*a, bind); | |
ca9b0e27 | 179 | return -EEXIST; |
4e8ddd7f | 180 | } |
ca9b0e27 | 181 | } |
ec7727bb DC |
182 | err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); |
183 | if (err < 0) | |
184 | goto release_idr; | |
ca9b0e27 | 185 | |
c749cdda DC |
186 | params_new = kzalloc(sizeof(*params_new), GFP_KERNEL); |
187 | if (unlikely(!params_new)) { | |
ec7727bb DC |
188 | err = -ENOMEM; |
189 | goto put_chain; | |
c749cdda DC |
190 | } |
191 | ||
192 | params_new->flags = flags; | |
ca9b0e27 | 193 | if (flags & SKBEDIT_F_PRIORITY) |
c749cdda | 194 | params_new->priority = *priority; |
ca9b0e27 | 195 | if (flags & SKBEDIT_F_QUEUE_MAPPING) |
c749cdda | 196 | params_new->queue_mapping = *queue_mapping; |
1c55d62e | 197 | if (flags & SKBEDIT_F_MARK) |
c749cdda | 198 | params_new->mark = *mark; |
ff202ee1 | 199 | if (flags & SKBEDIT_F_PTYPE) |
c749cdda | 200 | params_new->ptype = *ptype; |
4fe77d82 | 201 | /* default behaviour is to use all the bits */ |
c749cdda | 202 | params_new->mask = 0xffffffff; |
4fe77d82 | 203 | if (flags & SKBEDIT_F_MASK) |
c749cdda | 204 | params_new->mask = *mask; |
1c55d62e | 205 | |
6d7a8df6 | 206 | spin_lock_bh(&d->tcf_lock); |
ec7727bb | 207 | goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
6d7a8df6 VB |
208 | rcu_swap_protected(d->params, params_new, |
209 | lockdep_is_held(&d->tcf_lock)); | |
210 | spin_unlock_bh(&d->tcf_lock); | |
211 | if (params_new) | |
212 | kfree_rcu(params_new, rcu); | |
ec7727bb DC |
213 | if (goto_ch) |
214 | tcf_chain_put_by_act(goto_ch); | |
ca9b0e27 AD |
215 | |
216 | if (ret == ACT_P_CREATED) | |
65a206c0 | 217 | tcf_idr_insert(tn, *a); |
ca9b0e27 | 218 | return ret; |
ec7727bb DC |
219 | put_chain: |
220 | if (goto_ch) | |
221 | tcf_chain_put_by_act(goto_ch); | |
222 | release_idr: | |
223 | tcf_idr_release(*a, bind); | |
224 | return err; | |
ca9b0e27 AD |
225 | } |
226 | ||
cc7ec456 ED |
227 | static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a, |
228 | int bind, int ref) | |
ca9b0e27 AD |
229 | { |
230 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 231 | struct tcf_skbedit *d = to_skbedit(a); |
c749cdda | 232 | struct tcf_skbedit_params *params; |
1c40be12 ED |
233 | struct tc_skbedit opt = { |
234 | .index = d->tcf_index, | |
036bb443 VB |
235 | .refcnt = refcount_read(&d->tcf_refcnt) - ref, |
236 | .bindcnt = atomic_read(&d->tcf_bindcnt) - bind, | |
1c40be12 | 237 | }; |
e7e3728b | 238 | u64 pure_flags = 0; |
c749cdda DC |
239 | struct tcf_t t; |
240 | ||
6d7a8df6 VB |
241 | spin_lock_bh(&d->tcf_lock); |
242 | params = rcu_dereference_protected(d->params, | |
243 | lockdep_is_held(&d->tcf_lock)); | |
244 | opt.action = d->tcf_action; | |
ca9b0e27 | 245 | |
1b34ec43 DM |
246 | if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt)) |
247 | goto nla_put_failure; | |
c749cdda DC |
248 | if ((params->flags & SKBEDIT_F_PRIORITY) && |
249 | nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, params->priority)) | |
1b34ec43 | 250 | goto nla_put_failure; |
c749cdda DC |
251 | if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) && |
252 | nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, params->queue_mapping)) | |
1b34ec43 | 253 | goto nla_put_failure; |
c749cdda DC |
254 | if ((params->flags & SKBEDIT_F_MARK) && |
255 | nla_put_u32(skb, TCA_SKBEDIT_MARK, params->mark)) | |
1b34ec43 | 256 | goto nla_put_failure; |
c749cdda DC |
257 | if ((params->flags & SKBEDIT_F_PTYPE) && |
258 | nla_put_u16(skb, TCA_SKBEDIT_PTYPE, params->ptype)) | |
ff202ee1 | 259 | goto nla_put_failure; |
c749cdda DC |
260 | if ((params->flags & SKBEDIT_F_MASK) && |
261 | nla_put_u32(skb, TCA_SKBEDIT_MASK, params->mask)) | |
4fe77d82 | 262 | goto nla_put_failure; |
c749cdda | 263 | if (params->flags & SKBEDIT_F_INHERITDSFIELD) |
e7e3728b QF |
264 | pure_flags |= SKBEDIT_F_INHERITDSFIELD; |
265 | if (pure_flags != 0 && | |
266 | nla_put(skb, TCA_SKBEDIT_FLAGS, sizeof(pure_flags), &pure_flags)) | |
267 | goto nla_put_failure; | |
48d8ee16 JHS |
268 | |
269 | tcf_tm_dump(&t, &d->tcf_tm); | |
9854518e | 270 | if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD)) |
1b34ec43 | 271 | goto nla_put_failure; |
6d7a8df6 VB |
272 | spin_unlock_bh(&d->tcf_lock); |
273 | ||
ca9b0e27 AD |
274 | return skb->len; |
275 | ||
276 | nla_put_failure: | |
6d7a8df6 | 277 | spin_unlock_bh(&d->tcf_lock); |
ca9b0e27 AD |
278 | nlmsg_trim(skb, b); |
279 | return -1; | |
280 | } | |
281 | ||
c749cdda DC |
282 | static void tcf_skbedit_cleanup(struct tc_action *a) |
283 | { | |
284 | struct tcf_skbedit *d = to_skbedit(a); | |
285 | struct tcf_skbedit_params *params; | |
286 | ||
287 | params = rcu_dereference_protected(d->params, 1); | |
288 | if (params) | |
289 | kfree_rcu(params, rcu); | |
290 | } | |
291 | ||
ddf97ccd WC |
292 | static int tcf_skbedit_walker(struct net *net, struct sk_buff *skb, |
293 | struct netlink_callback *cb, int type, | |
41780105 AA |
294 | const struct tc_action_ops *ops, |
295 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
296 | { |
297 | struct tc_action_net *tn = net_generic(net, skbedit_net_id); | |
298 | ||
b3620145 | 299 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ddf97ccd WC |
300 | } |
301 | ||
f061b48c | 302 | static int tcf_skbedit_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
303 | { |
304 | struct tc_action_net *tn = net_generic(net, skbedit_net_id); | |
305 | ||
65a206c0 | 306 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
307 | } |
308 | ||
ca9b0e27 AD |
309 | static struct tc_action_ops act_skbedit_ops = { |
310 | .kind = "skbedit", | |
eddd2cf1 | 311 | .id = TCA_ID_SKBEDIT, |
ca9b0e27 | 312 | .owner = THIS_MODULE, |
45da1dac | 313 | .act = tcf_skbedit_act, |
ca9b0e27 | 314 | .dump = tcf_skbedit_dump, |
ca9b0e27 | 315 | .init = tcf_skbedit_init, |
c749cdda | 316 | .cleanup = tcf_skbedit_cleanup, |
ddf97ccd WC |
317 | .walk = tcf_skbedit_walker, |
318 | .lookup = tcf_skbedit_search, | |
a85a970a | 319 | .size = sizeof(struct tcf_skbedit), |
ddf97ccd WC |
320 | }; |
321 | ||
322 | static __net_init int skbedit_init_net(struct net *net) | |
323 | { | |
324 | struct tc_action_net *tn = net_generic(net, skbedit_net_id); | |
325 | ||
c7e460ce | 326 | return tc_action_net_init(tn, &act_skbedit_ops); |
ddf97ccd WC |
327 | } |
328 | ||
039af9c6 | 329 | static void __net_exit skbedit_exit_net(struct list_head *net_list) |
ddf97ccd | 330 | { |
039af9c6 | 331 | tc_action_net_exit(net_list, skbedit_net_id); |
ddf97ccd WC |
332 | } |
333 | ||
334 | static struct pernet_operations skbedit_net_ops = { | |
335 | .init = skbedit_init_net, | |
039af9c6 | 336 | .exit_batch = skbedit_exit_net, |
ddf97ccd WC |
337 | .id = &skbedit_net_id, |
338 | .size = sizeof(struct tc_action_net), | |
ca9b0e27 AD |
339 | }; |
340 | ||
341 | MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>"); | |
342 | MODULE_DESCRIPTION("SKB Editing"); | |
343 | MODULE_LICENSE("GPL"); | |
344 | ||
345 | static int __init skbedit_init_module(void) | |
346 | { | |
ddf97ccd | 347 | return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops); |
ca9b0e27 AD |
348 | } |
349 | ||
350 | static void __exit skbedit_cleanup_module(void) | |
351 | { | |
ddf97ccd | 352 | tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops); |
ca9b0e27 AD |
353 | } |
354 | ||
355 | module_init(skbedit_init_module); | |
356 | module_exit(skbedit_cleanup_module); |