1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2008, Intel Corporation.
5 * Author: Alexander Duyck <alexander.h.duyck@intel.com>
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>
17 #include <net/dsfield.h>
18 #include <net/pkt_cls.h>
20 #include <linux/tc_act/tc_skbedit.h>
21 #include <net/tc_act/tc_skbedit.h>
23 static unsigned int skbedit_net_id;
24 static struct tc_action_ops act_skbedit_ops;
26 static int tcf_skbedit_act(struct sk_buff *skb, const struct tc_action *a,
27 struct tcf_result *res)
29 struct tcf_skbedit *d = to_skbedit(a);
30 struct tcf_skbedit_params *params;
33 tcf_lastuse_update(&d->tcf_tm);
34 bstats_cpu_update(this_cpu_ptr(d->common.cpu_bstats), skb);
36 params = rcu_dereference_bh(d->params);
37 action = READ_ONCE(d->tcf_action);
39 if (params->flags & SKBEDIT_F_PRIORITY)
40 skb->priority = params->priority;
41 if (params->flags & SKBEDIT_F_INHERITDSFIELD) {
42 int wlen = skb_network_offset(skb);
44 switch (tc_skb_protocol(skb)) {
46 wlen += sizeof(struct iphdr);
47 if (!pskb_may_pull(skb, wlen))
49 skb->priority = ipv4_get_dsfield(ip_hdr(skb)) >> 2;
52 case htons(ETH_P_IPV6):
53 wlen += sizeof(struct ipv6hdr);
54 if (!pskb_may_pull(skb, wlen))
56 skb->priority = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2;
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;
67 if (params->flags & SKBEDIT_F_PTYPE)
68 skb->pkt_type = params->ptype;
72 qstats_drop_inc(this_cpu_ptr(d->common.cpu_qstats));
76 static void tcf_skbedit_stats_update(struct tc_action *a, u64 bytes,
77 u64 packets, u64 drops,
80 struct tcf_skbedit *d = to_skbedit(a);
81 struct tcf_t *tm = &d->tcf_tm;
83 tcf_action_update_stats(a, bytes, packets, drops, hw);
84 tm->lastuse = max_t(u64, tm->lastuse, lastuse);
87 static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
88 [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) },
89 [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) },
90 [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) },
91 [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) },
92 [TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) },
93 [TCA_SKBEDIT_MASK] = { .len = sizeof(u32) },
94 [TCA_SKBEDIT_FLAGS] = { .len = sizeof(u64) },
97 static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
98 struct nlattr *est, struct tc_action **a,
99 int ovr, int bind, bool rtnl_held,
100 struct tcf_proto *tp, u32 act_flags,
101 struct netlink_ext_ack *extack)
103 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
104 struct tcf_skbedit_params *params_new;
105 struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
106 struct tcf_chain *goto_ch = NULL;
107 struct tc_skbedit *parm;
108 struct tcf_skbedit *d;
109 u32 flags = 0, *priority = NULL, *mark = NULL, *mask = NULL;
110 u16 *queue_mapping = NULL, *ptype = NULL;
118 err = nla_parse_nested_deprecated(tb, TCA_SKBEDIT_MAX, nla,
119 skbedit_policy, NULL);
123 if (tb[TCA_SKBEDIT_PARMS] == NULL)
126 if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
127 flags |= SKBEDIT_F_PRIORITY;
128 priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
131 if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
132 flags |= SKBEDIT_F_QUEUE_MAPPING;
133 queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
136 if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
137 ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]);
138 if (!skb_pkt_type_ok(*ptype))
140 flags |= SKBEDIT_F_PTYPE;
143 if (tb[TCA_SKBEDIT_MARK] != NULL) {
144 flags |= SKBEDIT_F_MARK;
145 mark = nla_data(tb[TCA_SKBEDIT_MARK]);
148 if (tb[TCA_SKBEDIT_MASK] != NULL) {
149 flags |= SKBEDIT_F_MASK;
150 mask = nla_data(tb[TCA_SKBEDIT_MASK]);
153 if (tb[TCA_SKBEDIT_FLAGS] != NULL) {
154 u64 *pure_flags = nla_data(tb[TCA_SKBEDIT_FLAGS]);
156 if (*pure_flags & SKBEDIT_F_INHERITDSFIELD)
157 flags |= SKBEDIT_F_INHERITDSFIELD;
160 parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
162 err = tcf_idr_check_alloc(tn, &index, a, bind);
171 tcf_idr_release(*a, bind);
173 tcf_idr_cleanup(tn, index);
178 ret = tcf_idr_create(tn, index, est, a,
179 &act_skbedit_ops, bind, true, 0);
181 tcf_idr_cleanup(tn, index);
190 tcf_idr_release(*a, bind);
194 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
198 params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
199 if (unlikely(!params_new)) {
204 params_new->flags = flags;
205 if (flags & SKBEDIT_F_PRIORITY)
206 params_new->priority = *priority;
207 if (flags & SKBEDIT_F_QUEUE_MAPPING)
208 params_new->queue_mapping = *queue_mapping;
209 if (flags & SKBEDIT_F_MARK)
210 params_new->mark = *mark;
211 if (flags & SKBEDIT_F_PTYPE)
212 params_new->ptype = *ptype;
213 /* default behaviour is to use all the bits */
214 params_new->mask = 0xffffffff;
215 if (flags & SKBEDIT_F_MASK)
216 params_new->mask = *mask;
218 spin_lock_bh(&d->tcf_lock);
219 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
220 params_new = rcu_replace_pointer(d->params, params_new,
221 lockdep_is_held(&d->tcf_lock));
222 spin_unlock_bh(&d->tcf_lock);
224 kfree_rcu(params_new, rcu);
226 tcf_chain_put_by_act(goto_ch);
228 if (ret == ACT_P_CREATED)
229 tcf_idr_insert(tn, *a);
233 tcf_chain_put_by_act(goto_ch);
235 tcf_idr_release(*a, bind);
239 static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a,
242 unsigned char *b = skb_tail_pointer(skb);
243 struct tcf_skbedit *d = to_skbedit(a);
244 struct tcf_skbedit_params *params;
245 struct tc_skbedit opt = {
246 .index = d->tcf_index,
247 .refcnt = refcount_read(&d->tcf_refcnt) - ref,
248 .bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
253 spin_lock_bh(&d->tcf_lock);
254 params = rcu_dereference_protected(d->params,
255 lockdep_is_held(&d->tcf_lock));
256 opt.action = d->tcf_action;
258 if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
259 goto nla_put_failure;
260 if ((params->flags & SKBEDIT_F_PRIORITY) &&
261 nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, params->priority))
262 goto nla_put_failure;
263 if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) &&
264 nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, params->queue_mapping))
265 goto nla_put_failure;
266 if ((params->flags & SKBEDIT_F_MARK) &&
267 nla_put_u32(skb, TCA_SKBEDIT_MARK, params->mark))
268 goto nla_put_failure;
269 if ((params->flags & SKBEDIT_F_PTYPE) &&
270 nla_put_u16(skb, TCA_SKBEDIT_PTYPE, params->ptype))
271 goto nla_put_failure;
272 if ((params->flags & SKBEDIT_F_MASK) &&
273 nla_put_u32(skb, TCA_SKBEDIT_MASK, params->mask))
274 goto nla_put_failure;
275 if (params->flags & SKBEDIT_F_INHERITDSFIELD)
276 pure_flags |= SKBEDIT_F_INHERITDSFIELD;
277 if (pure_flags != 0 &&
278 nla_put(skb, TCA_SKBEDIT_FLAGS, sizeof(pure_flags), &pure_flags))
279 goto nla_put_failure;
281 tcf_tm_dump(&t, &d->tcf_tm);
282 if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD))
283 goto nla_put_failure;
284 spin_unlock_bh(&d->tcf_lock);
289 spin_unlock_bh(&d->tcf_lock);
294 static void tcf_skbedit_cleanup(struct tc_action *a)
296 struct tcf_skbedit *d = to_skbedit(a);
297 struct tcf_skbedit_params *params;
299 params = rcu_dereference_protected(d->params, 1);
301 kfree_rcu(params, rcu);
304 static int tcf_skbedit_walker(struct net *net, struct sk_buff *skb,
305 struct netlink_callback *cb, int type,
306 const struct tc_action_ops *ops,
307 struct netlink_ext_ack *extack)
309 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
311 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
314 static int tcf_skbedit_search(struct net *net, struct tc_action **a, u32 index)
316 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
318 return tcf_idr_search(tn, a, index);
321 static size_t tcf_skbedit_get_fill_size(const struct tc_action *act)
323 return nla_total_size(sizeof(struct tc_skbedit))
324 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_PRIORITY */
325 + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING */
326 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MARK */
327 + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_PTYPE */
328 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MASK */
329 + nla_total_size_64bit(sizeof(u64)); /* TCA_SKBEDIT_FLAGS */
332 static struct tc_action_ops act_skbedit_ops = {
334 .id = TCA_ID_SKBEDIT,
335 .owner = THIS_MODULE,
336 .act = tcf_skbedit_act,
337 .stats_update = tcf_skbedit_stats_update,
338 .dump = tcf_skbedit_dump,
339 .init = tcf_skbedit_init,
340 .cleanup = tcf_skbedit_cleanup,
341 .walk = tcf_skbedit_walker,
342 .get_fill_size = tcf_skbedit_get_fill_size,
343 .lookup = tcf_skbedit_search,
344 .size = sizeof(struct tcf_skbedit),
347 static __net_init int skbedit_init_net(struct net *net)
349 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
351 return tc_action_net_init(net, tn, &act_skbedit_ops);
354 static void __net_exit skbedit_exit_net(struct list_head *net_list)
356 tc_action_net_exit(net_list, skbedit_net_id);
359 static struct pernet_operations skbedit_net_ops = {
360 .init = skbedit_init_net,
361 .exit_batch = skbedit_exit_net,
362 .id = &skbedit_net_id,
363 .size = sizeof(struct tc_action_net),
366 MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
367 MODULE_DESCRIPTION("SKB Editing");
368 MODULE_LICENSE("GPL");
370 static int __init skbedit_init_module(void)
372 return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops);
375 static void __exit skbedit_cleanup_module(void)
377 tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops);
380 module_init(skbedit_init_module);
381 module_exit(skbedit_cleanup_module);