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 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) },
80 [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) },
81 [TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) },
82 [TCA_SKBEDIT_MASK] = { .len = sizeof(u32) },
83 [TCA_SKBEDIT_FLAGS] = { .len = sizeof(u64) },
86 static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
87 struct nlattr *est, struct tc_action **a,
88 int ovr, int bind, bool rtnl_held,
90 struct netlink_ext_ack *extack)
92 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
93 struct tcf_skbedit_params *params_new;
94 struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
95 struct tcf_chain *goto_ch = NULL;
96 struct tc_skbedit *parm;
97 struct tcf_skbedit *d;
98 u32 flags = 0, *priority = NULL, *mark = NULL, *mask = NULL;
99 u16 *queue_mapping = NULL, *ptype = NULL;
106 err = nla_parse_nested_deprecated(tb, TCA_SKBEDIT_MAX, nla,
107 skbedit_policy, NULL);
111 if (tb[TCA_SKBEDIT_PARMS] == NULL)
114 if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
115 flags |= SKBEDIT_F_PRIORITY;
116 priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
119 if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
120 flags |= SKBEDIT_F_QUEUE_MAPPING;
121 queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
124 if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
125 ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]);
126 if (!skb_pkt_type_ok(*ptype))
128 flags |= SKBEDIT_F_PTYPE;
131 if (tb[TCA_SKBEDIT_MARK] != NULL) {
132 flags |= SKBEDIT_F_MARK;
133 mark = nla_data(tb[TCA_SKBEDIT_MARK]);
136 if (tb[TCA_SKBEDIT_MASK] != NULL) {
137 flags |= SKBEDIT_F_MASK;
138 mask = nla_data(tb[TCA_SKBEDIT_MASK]);
141 if (tb[TCA_SKBEDIT_FLAGS] != NULL) {
142 u64 *pure_flags = nla_data(tb[TCA_SKBEDIT_FLAGS]);
144 if (*pure_flags & SKBEDIT_F_INHERITDSFIELD)
145 flags |= SKBEDIT_F_INHERITDSFIELD;
148 parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
150 err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
159 tcf_idr_release(*a, bind);
161 tcf_idr_cleanup(tn, parm->index);
166 ret = tcf_idr_create(tn, parm->index, est, a,
167 &act_skbedit_ops, bind, true);
169 tcf_idr_cleanup(tn, parm->index);
178 tcf_idr_release(*a, bind);
182 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
186 params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
187 if (unlikely(!params_new)) {
192 params_new->flags = flags;
193 if (flags & SKBEDIT_F_PRIORITY)
194 params_new->priority = *priority;
195 if (flags & SKBEDIT_F_QUEUE_MAPPING)
196 params_new->queue_mapping = *queue_mapping;
197 if (flags & SKBEDIT_F_MARK)
198 params_new->mark = *mark;
199 if (flags & SKBEDIT_F_PTYPE)
200 params_new->ptype = *ptype;
201 /* default behaviour is to use all the bits */
202 params_new->mask = 0xffffffff;
203 if (flags & SKBEDIT_F_MASK)
204 params_new->mask = *mask;
206 spin_lock_bh(&d->tcf_lock);
207 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
208 rcu_swap_protected(d->params, params_new,
209 lockdep_is_held(&d->tcf_lock));
210 spin_unlock_bh(&d->tcf_lock);
212 kfree_rcu(params_new, rcu);
214 tcf_chain_put_by_act(goto_ch);
216 if (ret == ACT_P_CREATED)
217 tcf_idr_insert(tn, *a);
221 tcf_chain_put_by_act(goto_ch);
223 tcf_idr_release(*a, bind);
227 static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a,
230 unsigned char *b = skb_tail_pointer(skb);
231 struct tcf_skbedit *d = to_skbedit(a);
232 struct tcf_skbedit_params *params;
233 struct tc_skbedit opt = {
234 .index = d->tcf_index,
235 .refcnt = refcount_read(&d->tcf_refcnt) - ref,
236 .bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
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;
246 if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
247 goto nla_put_failure;
248 if ((params->flags & SKBEDIT_F_PRIORITY) &&
249 nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, params->priority))
250 goto nla_put_failure;
251 if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) &&
252 nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, params->queue_mapping))
253 goto nla_put_failure;
254 if ((params->flags & SKBEDIT_F_MARK) &&
255 nla_put_u32(skb, TCA_SKBEDIT_MARK, params->mark))
256 goto nla_put_failure;
257 if ((params->flags & SKBEDIT_F_PTYPE) &&
258 nla_put_u16(skb, TCA_SKBEDIT_PTYPE, params->ptype))
259 goto nla_put_failure;
260 if ((params->flags & SKBEDIT_F_MASK) &&
261 nla_put_u32(skb, TCA_SKBEDIT_MASK, params->mask))
262 goto nla_put_failure;
263 if (params->flags & SKBEDIT_F_INHERITDSFIELD)
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;
269 tcf_tm_dump(&t, &d->tcf_tm);
270 if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD))
271 goto nla_put_failure;
272 spin_unlock_bh(&d->tcf_lock);
277 spin_unlock_bh(&d->tcf_lock);
282 static void tcf_skbedit_cleanup(struct tc_action *a)
284 struct tcf_skbedit *d = to_skbedit(a);
285 struct tcf_skbedit_params *params;
287 params = rcu_dereference_protected(d->params, 1);
289 kfree_rcu(params, rcu);
292 static int tcf_skbedit_walker(struct net *net, struct sk_buff *skb,
293 struct netlink_callback *cb, int type,
294 const struct tc_action_ops *ops,
295 struct netlink_ext_ack *extack)
297 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
299 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
302 static int tcf_skbedit_search(struct net *net, struct tc_action **a, u32 index)
304 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
306 return tcf_idr_search(tn, a, index);
309 static struct tc_action_ops act_skbedit_ops = {
311 .id = TCA_ID_SKBEDIT,
312 .owner = THIS_MODULE,
313 .act = tcf_skbedit_act,
314 .dump = tcf_skbedit_dump,
315 .init = tcf_skbedit_init,
316 .cleanup = tcf_skbedit_cleanup,
317 .walk = tcf_skbedit_walker,
318 .lookup = tcf_skbedit_search,
319 .size = sizeof(struct tcf_skbedit),
322 static __net_init int skbedit_init_net(struct net *net)
324 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
326 return tc_action_net_init(tn, &act_skbedit_ops);
329 static void __net_exit skbedit_exit_net(struct list_head *net_list)
331 tc_action_net_exit(net_list, skbedit_net_id);
334 static struct pernet_operations skbedit_net_ops = {
335 .init = skbedit_init_net,
336 .exit_batch = skbedit_exit_net,
337 .id = &skbedit_net_id,
338 .size = sizeof(struct tc_action_net),
341 MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
342 MODULE_DESCRIPTION("SKB Editing");
343 MODULE_LICENSE("GPL");
345 static int __init skbedit_init_module(void)
347 return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops);
350 static void __exit skbedit_cleanup_module(void)
352 tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops);
355 module_init(skbedit_init_module);
356 module_exit(skbedit_cleanup_module);