2 * Copyright (c) 2008, Intel Corporation.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, see <http://www.gnu.org/licenses/>.
16 * Author: Alexander Duyck <alexander.h.duyck@intel.com>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/skbuff.h>
23 #include <linux/rtnetlink.h>
24 #include <net/netlink.h>
25 #include <net/pkt_sched.h>
28 #include <net/dsfield.h>
30 #include <linux/tc_act/tc_skbedit.h>
31 #include <net/tc_act/tc_skbedit.h>
33 static unsigned int skbedit_net_id;
34 static struct tc_action_ops act_skbedit_ops;
36 static int tcf_skbedit_act(struct sk_buff *skb, const struct tc_action *a,
37 struct tcf_result *res)
39 struct tcf_skbedit *d = to_skbedit(a);
40 struct tcf_skbedit_params *params;
43 tcf_lastuse_update(&d->tcf_tm);
44 bstats_cpu_update(this_cpu_ptr(d->common.cpu_bstats), skb);
46 params = rcu_dereference_bh(d->params);
47 action = READ_ONCE(d->tcf_action);
49 if (params->flags & SKBEDIT_F_PRIORITY)
50 skb->priority = params->priority;
51 if (params->flags & SKBEDIT_F_INHERITDSFIELD) {
52 int wlen = skb_network_offset(skb);
54 switch (tc_skb_protocol(skb)) {
56 wlen += sizeof(struct iphdr);
57 if (!pskb_may_pull(skb, wlen))
59 skb->priority = ipv4_get_dsfield(ip_hdr(skb)) >> 2;
62 case htons(ETH_P_IPV6):
63 wlen += sizeof(struct ipv6hdr);
64 if (!pskb_may_pull(skb, wlen))
66 skb->priority = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2;
70 if (params->flags & SKBEDIT_F_QUEUE_MAPPING &&
71 skb->dev->real_num_tx_queues > params->queue_mapping)
72 skb_set_queue_mapping(skb, params->queue_mapping);
73 if (params->flags & SKBEDIT_F_MARK) {
74 skb->mark &= ~params->mask;
75 skb->mark |= params->mark & params->mask;
77 if (params->flags & SKBEDIT_F_PTYPE)
78 skb->pkt_type = params->ptype;
82 qstats_drop_inc(this_cpu_ptr(d->common.cpu_qstats));
86 static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
87 [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) },
88 [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) },
89 [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) },
90 [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) },
91 [TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) },
92 [TCA_SKBEDIT_MASK] = { .len = sizeof(u32) },
93 [TCA_SKBEDIT_FLAGS] = { .len = sizeof(u64) },
96 static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
97 struct nlattr *est, struct tc_action **a,
98 int ovr, int bind, bool rtnl_held,
99 struct netlink_ext_ack *extack)
101 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
102 struct tcf_skbedit_params *params_new;
103 struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
104 struct tc_skbedit *parm;
105 struct tcf_skbedit *d;
106 u32 flags = 0, *priority = NULL, *mark = NULL, *mask = NULL;
107 u16 *queue_mapping = NULL, *ptype = NULL;
114 err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy, NULL);
118 if (tb[TCA_SKBEDIT_PARMS] == NULL)
121 if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
122 flags |= SKBEDIT_F_PRIORITY;
123 priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
126 if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
127 flags |= SKBEDIT_F_QUEUE_MAPPING;
128 queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
131 if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
132 ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]);
133 if (!skb_pkt_type_ok(*ptype))
135 flags |= SKBEDIT_F_PTYPE;
138 if (tb[TCA_SKBEDIT_MARK] != NULL) {
139 flags |= SKBEDIT_F_MARK;
140 mark = nla_data(tb[TCA_SKBEDIT_MARK]);
143 if (tb[TCA_SKBEDIT_MASK] != NULL) {
144 flags |= SKBEDIT_F_MASK;
145 mask = nla_data(tb[TCA_SKBEDIT_MASK]);
148 if (tb[TCA_SKBEDIT_FLAGS] != NULL) {
149 u64 *pure_flags = nla_data(tb[TCA_SKBEDIT_FLAGS]);
151 if (*pure_flags & SKBEDIT_F_INHERITDSFIELD)
152 flags |= SKBEDIT_F_INHERITDSFIELD;
155 parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
157 err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
166 tcf_idr_release(*a, bind);
168 tcf_idr_cleanup(tn, parm->index);
173 ret = tcf_idr_create(tn, parm->index, est, a,
174 &act_skbedit_ops, bind, true);
176 tcf_idr_cleanup(tn, parm->index);
185 tcf_idr_release(*a, bind);
190 params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
191 if (unlikely(!params_new)) {
192 tcf_idr_release(*a, bind);
196 params_new->flags = flags;
197 if (flags & SKBEDIT_F_PRIORITY)
198 params_new->priority = *priority;
199 if (flags & SKBEDIT_F_QUEUE_MAPPING)
200 params_new->queue_mapping = *queue_mapping;
201 if (flags & SKBEDIT_F_MARK)
202 params_new->mark = *mark;
203 if (flags & SKBEDIT_F_PTYPE)
204 params_new->ptype = *ptype;
205 /* default behaviour is to use all the bits */
206 params_new->mask = 0xffffffff;
207 if (flags & SKBEDIT_F_MASK)
208 params_new->mask = *mask;
210 spin_lock_bh(&d->tcf_lock);
211 d->tcf_action = parm->action;
212 rcu_swap_protected(d->params, params_new,
213 lockdep_is_held(&d->tcf_lock));
214 spin_unlock_bh(&d->tcf_lock);
216 kfree_rcu(params_new, rcu);
218 if (ret == ACT_P_CREATED)
219 tcf_idr_insert(tn, *a);
223 static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a,
226 unsigned char *b = skb_tail_pointer(skb);
227 struct tcf_skbedit *d = to_skbedit(a);
228 struct tcf_skbedit_params *params;
229 struct tc_skbedit opt = {
230 .index = d->tcf_index,
231 .refcnt = refcount_read(&d->tcf_refcnt) - ref,
232 .bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
237 spin_lock_bh(&d->tcf_lock);
238 params = rcu_dereference_protected(d->params,
239 lockdep_is_held(&d->tcf_lock));
240 opt.action = d->tcf_action;
242 if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
243 goto nla_put_failure;
244 if ((params->flags & SKBEDIT_F_PRIORITY) &&
245 nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, params->priority))
246 goto nla_put_failure;
247 if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) &&
248 nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, params->queue_mapping))
249 goto nla_put_failure;
250 if ((params->flags & SKBEDIT_F_MARK) &&
251 nla_put_u32(skb, TCA_SKBEDIT_MARK, params->mark))
252 goto nla_put_failure;
253 if ((params->flags & SKBEDIT_F_PTYPE) &&
254 nla_put_u16(skb, TCA_SKBEDIT_PTYPE, params->ptype))
255 goto nla_put_failure;
256 if ((params->flags & SKBEDIT_F_MASK) &&
257 nla_put_u32(skb, TCA_SKBEDIT_MASK, params->mask))
258 goto nla_put_failure;
259 if (params->flags & SKBEDIT_F_INHERITDSFIELD)
260 pure_flags |= SKBEDIT_F_INHERITDSFIELD;
261 if (pure_flags != 0 &&
262 nla_put(skb, TCA_SKBEDIT_FLAGS, sizeof(pure_flags), &pure_flags))
263 goto nla_put_failure;
265 tcf_tm_dump(&t, &d->tcf_tm);
266 if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD))
267 goto nla_put_failure;
268 spin_unlock_bh(&d->tcf_lock);
273 spin_unlock_bh(&d->tcf_lock);
278 static void tcf_skbedit_cleanup(struct tc_action *a)
280 struct tcf_skbedit *d = to_skbedit(a);
281 struct tcf_skbedit_params *params;
283 params = rcu_dereference_protected(d->params, 1);
285 kfree_rcu(params, rcu);
288 static int tcf_skbedit_walker(struct net *net, struct sk_buff *skb,
289 struct netlink_callback *cb, int type,
290 const struct tc_action_ops *ops,
291 struct netlink_ext_ack *extack)
293 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
295 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
298 static int tcf_skbedit_search(struct net *net, struct tc_action **a, u32 index)
300 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
302 return tcf_idr_search(tn, a, index);
305 static struct tc_action_ops act_skbedit_ops = {
307 .id = TCA_ID_SKBEDIT,
308 .owner = THIS_MODULE,
309 .act = tcf_skbedit_act,
310 .dump = tcf_skbedit_dump,
311 .init = tcf_skbedit_init,
312 .cleanup = tcf_skbedit_cleanup,
313 .walk = tcf_skbedit_walker,
314 .lookup = tcf_skbedit_search,
315 .size = sizeof(struct tcf_skbedit),
318 static __net_init int skbedit_init_net(struct net *net)
320 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
322 return tc_action_net_init(tn, &act_skbedit_ops);
325 static void __net_exit skbedit_exit_net(struct list_head *net_list)
327 tc_action_net_exit(net_list, skbedit_net_id);
330 static struct pernet_operations skbedit_net_ops = {
331 .init = skbedit_init_net,
332 .exit_batch = skbedit_exit_net,
333 .id = &skbedit_net_id,
334 .size = sizeof(struct tc_action_net),
337 MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
338 MODULE_DESCRIPTION("SKB Editing");
339 MODULE_LICENSE("GPL");
341 static int __init skbedit_init_module(void)
343 return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops);
346 static void __exit skbedit_cleanup_module(void)
348 tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops);
351 module_init(skbedit_init_module);
352 module_exit(skbedit_cleanup_module);