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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2008, Intel Corporation.
4 *
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>
15#include <net/ip.h>
16#include <net/ipv6.h>
17#include <net/dsfield.h>
18#include <net/pkt_cls.h>
19
20#include <linux/tc_act/tc_skbedit.h>
21#include <net/tc_act/tc_skbedit.h>
22
23static unsigned int skbedit_net_id;
24static struct tc_action_ops act_skbedit_ops;
25
26static int tcf_skbedit_act(struct sk_buff *skb, const struct tc_action *a,
27 struct tcf_result *res)
28{
29 struct tcf_skbedit *d = to_skbedit(a);
30 struct tcf_skbedit_params *params;
31 int action;
32
33 tcf_lastuse_update(&d->tcf_tm);
34 bstats_cpu_update(this_cpu_ptr(d->common.cpu_bstats), skb);
35
36 params = rcu_dereference_bh(d->params);
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) {
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 }
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;
66 }
67 if (params->flags & SKBEDIT_F_PTYPE)
68 skb->pkt_type = params->ptype;
69 return action;
70
71err:
72 qstats_drop_inc(this_cpu_ptr(d->common.cpu_qstats));
73 return TC_ACT_SHOT;
74}
75
76static 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) },
84};
85
86static 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,
89 struct tcf_proto *tp,
90 struct netlink_ext_ack *extack)
91{
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;
100 bool exists = false;
101 int ret = 0, err;
102 u32 index;
103
104 if (nla == NULL)
105 return -EINVAL;
106
107 err = nla_parse_nested_deprecated(tb, TCA_SKBEDIT_MAX, nla,
108 skbedit_policy, NULL);
109 if (err < 0)
110 return err;
111
112 if (tb[TCA_SKBEDIT_PARMS] == NULL)
113 return -EINVAL;
114
115 if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
116 flags |= SKBEDIT_F_PRIORITY;
117 priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
118 }
119
120 if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
121 flags |= SKBEDIT_F_QUEUE_MAPPING;
122 queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
123 }
124
125 if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
126 ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]);
127 if (!skb_pkt_type_ok(*ptype))
128 return -EINVAL;
129 flags |= SKBEDIT_F_PTYPE;
130 }
131
132 if (tb[TCA_SKBEDIT_MARK] != NULL) {
133 flags |= SKBEDIT_F_MARK;
134 mark = nla_data(tb[TCA_SKBEDIT_MARK]);
135 }
136
137 if (tb[TCA_SKBEDIT_MASK] != NULL) {
138 flags |= SKBEDIT_F_MASK;
139 mask = nla_data(tb[TCA_SKBEDIT_MASK]);
140 }
141
142 if (tb[TCA_SKBEDIT_FLAGS] != NULL) {
143 u64 *pure_flags = nla_data(tb[TCA_SKBEDIT_FLAGS]);
144
145 if (*pure_flags & SKBEDIT_F_INHERITDSFIELD)
146 flags |= SKBEDIT_F_INHERITDSFIELD;
147 }
148
149 parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
150 index = parm->index;
151 err = tcf_idr_check_alloc(tn, &index, a, bind);
152 if (err < 0)
153 return err;
154 exists = err;
155 if (exists && bind)
156 return 0;
157
158 if (!flags) {
159 if (exists)
160 tcf_idr_release(*a, bind);
161 else
162 tcf_idr_cleanup(tn, index);
163 return -EINVAL;
164 }
165
166 if (!exists) {
167 ret = tcf_idr_create(tn, index, est, a,
168 &act_skbedit_ops, bind, true);
169 if (ret) {
170 tcf_idr_cleanup(tn, index);
171 return ret;
172 }
173
174 d = to_skbedit(*a);
175 ret = ACT_P_CREATED;
176 } else {
177 d = to_skbedit(*a);
178 if (!ovr) {
179 tcf_idr_release(*a, bind);
180 return -EEXIST;
181 }
182 }
183 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
184 if (err < 0)
185 goto release_idr;
186
187 params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
188 if (unlikely(!params_new)) {
189 err = -ENOMEM;
190 goto put_chain;
191 }
192
193 params_new->flags = flags;
194 if (flags & SKBEDIT_F_PRIORITY)
195 params_new->priority = *priority;
196 if (flags & SKBEDIT_F_QUEUE_MAPPING)
197 params_new->queue_mapping = *queue_mapping;
198 if (flags & SKBEDIT_F_MARK)
199 params_new->mark = *mark;
200 if (flags & SKBEDIT_F_PTYPE)
201 params_new->ptype = *ptype;
202 /* default behaviour is to use all the bits */
203 params_new->mask = 0xffffffff;
204 if (flags & SKBEDIT_F_MASK)
205 params_new->mask = *mask;
206
207 spin_lock_bh(&d->tcf_lock);
208 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
209 rcu_swap_protected(d->params, params_new,
210 lockdep_is_held(&d->tcf_lock));
211 spin_unlock_bh(&d->tcf_lock);
212 if (params_new)
213 kfree_rcu(params_new, rcu);
214 if (goto_ch)
215 tcf_chain_put_by_act(goto_ch);
216
217 if (ret == ACT_P_CREATED)
218 tcf_idr_insert(tn, *a);
219 return ret;
220put_chain:
221 if (goto_ch)
222 tcf_chain_put_by_act(goto_ch);
223release_idr:
224 tcf_idr_release(*a, bind);
225 return err;
226}
227
228static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a,
229 int bind, int ref)
230{
231 unsigned char *b = skb_tail_pointer(skb);
232 struct tcf_skbedit *d = to_skbedit(a);
233 struct tcf_skbedit_params *params;
234 struct tc_skbedit opt = {
235 .index = d->tcf_index,
236 .refcnt = refcount_read(&d->tcf_refcnt) - ref,
237 .bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
238 };
239 u64 pure_flags = 0;
240 struct tcf_t t;
241
242 spin_lock_bh(&d->tcf_lock);
243 params = rcu_dereference_protected(d->params,
244 lockdep_is_held(&d->tcf_lock));
245 opt.action = d->tcf_action;
246
247 if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
248 goto nla_put_failure;
249 if ((params->flags & SKBEDIT_F_PRIORITY) &&
250 nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, params->priority))
251 goto nla_put_failure;
252 if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) &&
253 nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, params->queue_mapping))
254 goto nla_put_failure;
255 if ((params->flags & SKBEDIT_F_MARK) &&
256 nla_put_u32(skb, TCA_SKBEDIT_MARK, params->mark))
257 goto nla_put_failure;
258 if ((params->flags & SKBEDIT_F_PTYPE) &&
259 nla_put_u16(skb, TCA_SKBEDIT_PTYPE, params->ptype))
260 goto nla_put_failure;
261 if ((params->flags & SKBEDIT_F_MASK) &&
262 nla_put_u32(skb, TCA_SKBEDIT_MASK, params->mask))
263 goto nla_put_failure;
264 if (params->flags & SKBEDIT_F_INHERITDSFIELD)
265 pure_flags |= SKBEDIT_F_INHERITDSFIELD;
266 if (pure_flags != 0 &&
267 nla_put(skb, TCA_SKBEDIT_FLAGS, sizeof(pure_flags), &pure_flags))
268 goto nla_put_failure;
269
270 tcf_tm_dump(&t, &d->tcf_tm);
271 if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD))
272 goto nla_put_failure;
273 spin_unlock_bh(&d->tcf_lock);
274
275 return skb->len;
276
277nla_put_failure:
278 spin_unlock_bh(&d->tcf_lock);
279 nlmsg_trim(skb, b);
280 return -1;
281}
282
283static void tcf_skbedit_cleanup(struct tc_action *a)
284{
285 struct tcf_skbedit *d = to_skbedit(a);
286 struct tcf_skbedit_params *params;
287
288 params = rcu_dereference_protected(d->params, 1);
289 if (params)
290 kfree_rcu(params, rcu);
291}
292
293static int tcf_skbedit_walker(struct net *net, struct sk_buff *skb,
294 struct netlink_callback *cb, int type,
295 const struct tc_action_ops *ops,
296 struct netlink_ext_ack *extack)
297{
298 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
299
300 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
301}
302
303static int tcf_skbedit_search(struct net *net, struct tc_action **a, u32 index)
304{
305 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
306
307 return tcf_idr_search(tn, a, index);
308}
309
310static size_t tcf_skbedit_get_fill_size(const struct tc_action *act)
311{
312 return nla_total_size(sizeof(struct tc_skbedit))
313 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_PRIORITY */
314 + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING */
315 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MARK */
316 + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_PTYPE */
317 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MASK */
318 + nla_total_size_64bit(sizeof(u64)); /* TCA_SKBEDIT_FLAGS */
319}
320
321static struct tc_action_ops act_skbedit_ops = {
322 .kind = "skbedit",
323 .id = TCA_ID_SKBEDIT,
324 .owner = THIS_MODULE,
325 .act = tcf_skbedit_act,
326 .dump = tcf_skbedit_dump,
327 .init = tcf_skbedit_init,
328 .cleanup = tcf_skbedit_cleanup,
329 .walk = tcf_skbedit_walker,
330 .get_fill_size = tcf_skbedit_get_fill_size,
331 .lookup = tcf_skbedit_search,
332 .size = sizeof(struct tcf_skbedit),
333};
334
335static __net_init int skbedit_init_net(struct net *net)
336{
337 struct tc_action_net *tn = net_generic(net, skbedit_net_id);
338
339 return tc_action_net_init(net, tn, &act_skbedit_ops);
340}
341
342static void __net_exit skbedit_exit_net(struct list_head *net_list)
343{
344 tc_action_net_exit(net_list, skbedit_net_id);
345}
346
347static struct pernet_operations skbedit_net_ops = {
348 .init = skbedit_init_net,
349 .exit_batch = skbedit_exit_net,
350 .id = &skbedit_net_id,
351 .size = sizeof(struct tc_action_net),
352};
353
354MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
355MODULE_DESCRIPTION("SKB Editing");
356MODULE_LICENSE("GPL");
357
358static int __init skbedit_init_module(void)
359{
360 return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops);
361}
362
363static void __exit skbedit_cleanup_module(void)
364{
365 tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops);
366}
367
368module_init(skbedit_init_module);
369module_exit(skbedit_cleanup_module);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2008, Intel Corporation.
4 *
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>
15#include <net/ip.h>
16#include <net/ipv6.h>
17#include <net/dsfield.h>
18#include <net/pkt_cls.h>
19#include <net/tc_wrapper.h>
20
21#include <linux/tc_act/tc_skbedit.h>
22#include <net/tc_act/tc_skbedit.h>
23
24static struct tc_action_ops act_skbedit_ops;
25
26static u16 tcf_skbedit_hash(struct tcf_skbedit_params *params,
27 struct sk_buff *skb)
28{
29 u16 queue_mapping = params->queue_mapping;
30
31 if (params->flags & SKBEDIT_F_TXQ_SKBHASH) {
32 u32 hash = skb_get_hash(skb);
33
34 queue_mapping += hash % params->mapping_mod;
35 }
36
37 return netdev_cap_txqueue(skb->dev, queue_mapping);
38}
39
40TC_INDIRECT_SCOPE int tcf_skbedit_act(struct sk_buff *skb,
41 const struct tc_action *a,
42 struct tcf_result *res)
43{
44 struct tcf_skbedit *d = to_skbedit(a);
45 struct tcf_skbedit_params *params;
46 int action;
47
48 tcf_lastuse_update(&d->tcf_tm);
49 bstats_update(this_cpu_ptr(d->common.cpu_bstats), skb);
50
51 params = rcu_dereference_bh(d->params);
52 action = READ_ONCE(d->tcf_action);
53
54 if (params->flags & SKBEDIT_F_PRIORITY)
55 skb->priority = params->priority;
56 if (params->flags & SKBEDIT_F_INHERITDSFIELD) {
57 int wlen = skb_network_offset(skb);
58
59 switch (skb_protocol(skb, true)) {
60 case htons(ETH_P_IP):
61 wlen += sizeof(struct iphdr);
62 if (!pskb_may_pull(skb, wlen))
63 goto err;
64 skb->priority = ipv4_get_dsfield(ip_hdr(skb)) >> 2;
65 break;
66
67 case htons(ETH_P_IPV6):
68 wlen += sizeof(struct ipv6hdr);
69 if (!pskb_may_pull(skb, wlen))
70 goto err;
71 skb->priority = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2;
72 break;
73 }
74 }
75 if (params->flags & SKBEDIT_F_QUEUE_MAPPING &&
76 skb->dev->real_num_tx_queues > params->queue_mapping) {
77#ifdef CONFIG_NET_EGRESS
78 netdev_xmit_skip_txqueue(true);
79#endif
80 skb_set_queue_mapping(skb, tcf_skbedit_hash(params, skb));
81 }
82 if (params->flags & SKBEDIT_F_MARK) {
83 skb->mark &= ~params->mask;
84 skb->mark |= params->mark & params->mask;
85 }
86 if (params->flags & SKBEDIT_F_PTYPE)
87 skb->pkt_type = params->ptype;
88 return action;
89
90err:
91 qstats_drop_inc(this_cpu_ptr(d->common.cpu_qstats));
92 return TC_ACT_SHOT;
93}
94
95static void tcf_skbedit_stats_update(struct tc_action *a, u64 bytes,
96 u64 packets, u64 drops,
97 u64 lastuse, bool hw)
98{
99 struct tcf_skbedit *d = to_skbedit(a);
100 struct tcf_t *tm = &d->tcf_tm;
101
102 tcf_action_update_stats(a, bytes, packets, drops, hw);
103 tm->lastuse = max_t(u64, tm->lastuse, lastuse);
104}
105
106static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
107 [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) },
108 [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) },
109 [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) },
110 [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) },
111 [TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) },
112 [TCA_SKBEDIT_MASK] = { .len = sizeof(u32) },
113 [TCA_SKBEDIT_FLAGS] = { .len = sizeof(u64) },
114 [TCA_SKBEDIT_QUEUE_MAPPING_MAX] = { .len = sizeof(u16) },
115};
116
117static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
118 struct nlattr *est, struct tc_action **a,
119 struct tcf_proto *tp, u32 act_flags,
120 struct netlink_ext_ack *extack)
121{
122 struct tc_action_net *tn = net_generic(net, act_skbedit_ops.net_id);
123 bool bind = act_flags & TCA_ACT_FLAGS_BIND;
124 struct tcf_skbedit_params *params_new;
125 struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
126 struct tcf_chain *goto_ch = NULL;
127 struct tc_skbedit *parm;
128 struct tcf_skbedit *d;
129 u32 flags = 0, *priority = NULL, *mark = NULL, *mask = NULL;
130 u16 *queue_mapping = NULL, *ptype = NULL;
131 u16 mapping_mod = 1;
132 bool exists = false;
133 int ret = 0, err;
134 u32 index;
135
136 if (nla == NULL)
137 return -EINVAL;
138
139 err = nla_parse_nested_deprecated(tb, TCA_SKBEDIT_MAX, nla,
140 skbedit_policy, NULL);
141 if (err < 0)
142 return err;
143
144 if (tb[TCA_SKBEDIT_PARMS] == NULL)
145 return -EINVAL;
146
147 if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
148 flags |= SKBEDIT_F_PRIORITY;
149 priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
150 }
151
152 if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
153 if (is_tcf_skbedit_ingress(act_flags) &&
154 !(act_flags & TCA_ACT_FLAGS_SKIP_SW)) {
155 NL_SET_ERR_MSG_MOD(extack, "\"queue_mapping\" option on receive side is hardware only, use skip_sw");
156 return -EOPNOTSUPP;
157 }
158 flags |= SKBEDIT_F_QUEUE_MAPPING;
159 queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
160 }
161
162 if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
163 ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]);
164 if (!skb_pkt_type_ok(*ptype))
165 return -EINVAL;
166 flags |= SKBEDIT_F_PTYPE;
167 }
168
169 if (tb[TCA_SKBEDIT_MARK] != NULL) {
170 flags |= SKBEDIT_F_MARK;
171 mark = nla_data(tb[TCA_SKBEDIT_MARK]);
172 }
173
174 if (tb[TCA_SKBEDIT_MASK] != NULL) {
175 flags |= SKBEDIT_F_MASK;
176 mask = nla_data(tb[TCA_SKBEDIT_MASK]);
177 }
178
179 if (tb[TCA_SKBEDIT_FLAGS] != NULL) {
180 u64 *pure_flags = nla_data(tb[TCA_SKBEDIT_FLAGS]);
181
182 if (*pure_flags & SKBEDIT_F_TXQ_SKBHASH) {
183 u16 *queue_mapping_max;
184
185 if (!tb[TCA_SKBEDIT_QUEUE_MAPPING] ||
186 !tb[TCA_SKBEDIT_QUEUE_MAPPING_MAX]) {
187 NL_SET_ERR_MSG_MOD(extack, "Missing required range of queue_mapping.");
188 return -EINVAL;
189 }
190
191 queue_mapping_max =
192 nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING_MAX]);
193 if (*queue_mapping_max < *queue_mapping) {
194 NL_SET_ERR_MSG_MOD(extack, "The range of queue_mapping is invalid, max < min.");
195 return -EINVAL;
196 }
197
198 mapping_mod = *queue_mapping_max - *queue_mapping + 1;
199 flags |= SKBEDIT_F_TXQ_SKBHASH;
200 }
201 if (*pure_flags & SKBEDIT_F_INHERITDSFIELD)
202 flags |= SKBEDIT_F_INHERITDSFIELD;
203 }
204
205 parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
206 index = parm->index;
207 err = tcf_idr_check_alloc(tn, &index, a, bind);
208 if (err < 0)
209 return err;
210 exists = err;
211 if (exists && bind)
212 return ACT_P_BOUND;
213
214 if (!flags) {
215 if (exists)
216 tcf_idr_release(*a, bind);
217 else
218 tcf_idr_cleanup(tn, index);
219 return -EINVAL;
220 }
221
222 if (!exists) {
223 ret = tcf_idr_create(tn, index, est, a,
224 &act_skbedit_ops, bind, true, act_flags);
225 if (ret) {
226 tcf_idr_cleanup(tn, index);
227 return ret;
228 }
229
230 d = to_skbedit(*a);
231 ret = ACT_P_CREATED;
232 } else {
233 d = to_skbedit(*a);
234 if (!(act_flags & TCA_ACT_FLAGS_REPLACE)) {
235 tcf_idr_release(*a, bind);
236 return -EEXIST;
237 }
238 }
239 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
240 if (err < 0)
241 goto release_idr;
242
243 params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
244 if (unlikely(!params_new)) {
245 err = -ENOMEM;
246 goto put_chain;
247 }
248
249 params_new->flags = flags;
250 if (flags & SKBEDIT_F_PRIORITY)
251 params_new->priority = *priority;
252 if (flags & SKBEDIT_F_QUEUE_MAPPING) {
253 params_new->queue_mapping = *queue_mapping;
254 params_new->mapping_mod = mapping_mod;
255 }
256 if (flags & SKBEDIT_F_MARK)
257 params_new->mark = *mark;
258 if (flags & SKBEDIT_F_PTYPE)
259 params_new->ptype = *ptype;
260 /* default behaviour is to use all the bits */
261 params_new->mask = 0xffffffff;
262 if (flags & SKBEDIT_F_MASK)
263 params_new->mask = *mask;
264
265 spin_lock_bh(&d->tcf_lock);
266 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
267 params_new = rcu_replace_pointer(d->params, params_new,
268 lockdep_is_held(&d->tcf_lock));
269 spin_unlock_bh(&d->tcf_lock);
270 if (params_new)
271 kfree_rcu(params_new, rcu);
272 if (goto_ch)
273 tcf_chain_put_by_act(goto_ch);
274
275 return ret;
276put_chain:
277 if (goto_ch)
278 tcf_chain_put_by_act(goto_ch);
279release_idr:
280 tcf_idr_release(*a, bind);
281 return err;
282}
283
284static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a,
285 int bind, int ref)
286{
287 unsigned char *b = skb_tail_pointer(skb);
288 struct tcf_skbedit *d = to_skbedit(a);
289 struct tcf_skbedit_params *params;
290 struct tc_skbedit opt = {
291 .index = d->tcf_index,
292 .refcnt = refcount_read(&d->tcf_refcnt) - ref,
293 .bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
294 };
295 u64 pure_flags = 0;
296 struct tcf_t t;
297
298 spin_lock_bh(&d->tcf_lock);
299 params = rcu_dereference_protected(d->params,
300 lockdep_is_held(&d->tcf_lock));
301 opt.action = d->tcf_action;
302
303 if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
304 goto nla_put_failure;
305 if ((params->flags & SKBEDIT_F_PRIORITY) &&
306 nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, params->priority))
307 goto nla_put_failure;
308 if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) &&
309 nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, params->queue_mapping))
310 goto nla_put_failure;
311 if ((params->flags & SKBEDIT_F_MARK) &&
312 nla_put_u32(skb, TCA_SKBEDIT_MARK, params->mark))
313 goto nla_put_failure;
314 if ((params->flags & SKBEDIT_F_PTYPE) &&
315 nla_put_u16(skb, TCA_SKBEDIT_PTYPE, params->ptype))
316 goto nla_put_failure;
317 if ((params->flags & SKBEDIT_F_MASK) &&
318 nla_put_u32(skb, TCA_SKBEDIT_MASK, params->mask))
319 goto nla_put_failure;
320 if (params->flags & SKBEDIT_F_INHERITDSFIELD)
321 pure_flags |= SKBEDIT_F_INHERITDSFIELD;
322 if (params->flags & SKBEDIT_F_TXQ_SKBHASH) {
323 if (nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING_MAX,
324 params->queue_mapping + params->mapping_mod - 1))
325 goto nla_put_failure;
326
327 pure_flags |= SKBEDIT_F_TXQ_SKBHASH;
328 }
329 if (pure_flags != 0 &&
330 nla_put(skb, TCA_SKBEDIT_FLAGS, sizeof(pure_flags), &pure_flags))
331 goto nla_put_failure;
332
333 tcf_tm_dump(&t, &d->tcf_tm);
334 if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD))
335 goto nla_put_failure;
336 spin_unlock_bh(&d->tcf_lock);
337
338 return skb->len;
339
340nla_put_failure:
341 spin_unlock_bh(&d->tcf_lock);
342 nlmsg_trim(skb, b);
343 return -1;
344}
345
346static void tcf_skbedit_cleanup(struct tc_action *a)
347{
348 struct tcf_skbedit *d = to_skbedit(a);
349 struct tcf_skbedit_params *params;
350
351 params = rcu_dereference_protected(d->params, 1);
352 if (params)
353 kfree_rcu(params, rcu);
354}
355
356static size_t tcf_skbedit_get_fill_size(const struct tc_action *act)
357{
358 return nla_total_size(sizeof(struct tc_skbedit))
359 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_PRIORITY */
360 + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING */
361 + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING_MAX */
362 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MARK */
363 + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_PTYPE */
364 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MASK */
365 + nla_total_size_64bit(sizeof(u64)); /* TCA_SKBEDIT_FLAGS */
366}
367
368static int tcf_skbedit_offload_act_setup(struct tc_action *act, void *entry_data,
369 u32 *index_inc, bool bind,
370 struct netlink_ext_ack *extack)
371{
372 if (bind) {
373 struct flow_action_entry *entry = entry_data;
374
375 if (is_tcf_skbedit_mark(act)) {
376 entry->id = FLOW_ACTION_MARK;
377 entry->mark = tcf_skbedit_mark(act);
378 } else if (is_tcf_skbedit_ptype(act)) {
379 entry->id = FLOW_ACTION_PTYPE;
380 entry->ptype = tcf_skbedit_ptype(act);
381 } else if (is_tcf_skbedit_priority(act)) {
382 entry->id = FLOW_ACTION_PRIORITY;
383 entry->priority = tcf_skbedit_priority(act);
384 } else if (is_tcf_skbedit_tx_queue_mapping(act)) {
385 NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"queue_mapping\" option is used on transmit side");
386 return -EOPNOTSUPP;
387 } else if (is_tcf_skbedit_rx_queue_mapping(act)) {
388 entry->id = FLOW_ACTION_RX_QUEUE_MAPPING;
389 entry->rx_queue = tcf_skbedit_rx_queue_mapping(act);
390 } else if (is_tcf_skbedit_inheritdsfield(act)) {
391 NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"inheritdsfield\" option is used");
392 return -EOPNOTSUPP;
393 } else {
394 NL_SET_ERR_MSG_MOD(extack, "Unsupported skbedit option offload");
395 return -EOPNOTSUPP;
396 }
397 *index_inc = 1;
398 } else {
399 struct flow_offload_action *fl_action = entry_data;
400
401 if (is_tcf_skbedit_mark(act))
402 fl_action->id = FLOW_ACTION_MARK;
403 else if (is_tcf_skbedit_ptype(act))
404 fl_action->id = FLOW_ACTION_PTYPE;
405 else if (is_tcf_skbedit_priority(act))
406 fl_action->id = FLOW_ACTION_PRIORITY;
407 else if (is_tcf_skbedit_rx_queue_mapping(act))
408 fl_action->id = FLOW_ACTION_RX_QUEUE_MAPPING;
409 else
410 return -EOPNOTSUPP;
411 }
412
413 return 0;
414}
415
416static struct tc_action_ops act_skbedit_ops = {
417 .kind = "skbedit",
418 .id = TCA_ID_SKBEDIT,
419 .owner = THIS_MODULE,
420 .act = tcf_skbedit_act,
421 .stats_update = tcf_skbedit_stats_update,
422 .dump = tcf_skbedit_dump,
423 .init = tcf_skbedit_init,
424 .cleanup = tcf_skbedit_cleanup,
425 .get_fill_size = tcf_skbedit_get_fill_size,
426 .offload_act_setup = tcf_skbedit_offload_act_setup,
427 .size = sizeof(struct tcf_skbedit),
428};
429
430static __net_init int skbedit_init_net(struct net *net)
431{
432 struct tc_action_net *tn = net_generic(net, act_skbedit_ops.net_id);
433
434 return tc_action_net_init(net, tn, &act_skbedit_ops);
435}
436
437static void __net_exit skbedit_exit_net(struct list_head *net_list)
438{
439 tc_action_net_exit(net_list, act_skbedit_ops.net_id);
440}
441
442static struct pernet_operations skbedit_net_ops = {
443 .init = skbedit_init_net,
444 .exit_batch = skbedit_exit_net,
445 .id = &act_skbedit_ops.net_id,
446 .size = sizeof(struct tc_action_net),
447};
448
449MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
450MODULE_DESCRIPTION("SKB Editing");
451MODULE_LICENSE("GPL");
452
453static int __init skbedit_init_module(void)
454{
455 return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops);
456}
457
458static void __exit skbedit_cleanup_module(void)
459{
460 tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops);
461}
462
463module_init(skbedit_init_module);
464module_exit(skbedit_cleanup_module);