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Linux/net/sched/act_vlan.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
  4  */
  5 
  6 #include <linux/module.h>
  7 #include <linux/init.h>
  8 #include <linux/kernel.h>
  9 #include <linux/skbuff.h>
 10 #include <linux/rtnetlink.h>
 11 #include <linux/if_vlan.h>
 12 #include <net/netlink.h>
 13 #include <net/pkt_sched.h>
 14 #include <net/pkt_cls.h>
 15 
 16 #include <linux/tc_act/tc_vlan.h>
 17 #include <net/tc_act/tc_vlan.h>
 18 
 19 static unsigned int vlan_net_id;
 20 static struct tc_action_ops act_vlan_ops;
 21 
 22 static int tcf_vlan_act(struct sk_buff *skb, const struct tc_action *a,
 23                         struct tcf_result *res)
 24 {
 25         struct tcf_vlan *v = to_vlan(a);
 26         struct tcf_vlan_params *p;
 27         int action;
 28         int err;
 29         u16 tci;
 30 
 31         tcf_lastuse_update(&v->tcf_tm);
 32         tcf_action_update_bstats(&v->common, skb);
 33 
 34         /* Ensure 'data' points at mac_header prior calling vlan manipulating
 35          * functions.
 36          */
 37         if (skb_at_tc_ingress(skb))
 38                 skb_push_rcsum(skb, skb->mac_len);
 39 
 40         action = READ_ONCE(v->tcf_action);
 41 
 42         p = rcu_dereference_bh(v->vlan_p);
 43 
 44         switch (p->tcfv_action) {
 45         case TCA_VLAN_ACT_POP:
 46                 err = skb_vlan_pop(skb);
 47                 if (err)
 48                         goto drop;
 49                 break;
 50         case TCA_VLAN_ACT_PUSH:
 51                 err = skb_vlan_push(skb, p->tcfv_push_proto, p->tcfv_push_vid |
 52                                     (p->tcfv_push_prio << VLAN_PRIO_SHIFT));
 53                 if (err)
 54                         goto drop;
 55                 break;
 56         case TCA_VLAN_ACT_MODIFY:
 57                 /* No-op if no vlan tag (either hw-accel or in-payload) */
 58                 if (!skb_vlan_tagged(skb))
 59                         goto out;
 60                 /* extract existing tag (and guarantee no hw-accel tag) */
 61                 if (skb_vlan_tag_present(skb)) {
 62                         tci = skb_vlan_tag_get(skb);
 63                         __vlan_hwaccel_clear_tag(skb);
 64                 } else {
 65                         /* in-payload vlan tag, pop it */
 66                         err = __skb_vlan_pop(skb, &tci);
 67                         if (err)
 68                                 goto drop;
 69                 }
 70                 /* replace the vid */
 71                 tci = (tci & ~VLAN_VID_MASK) | p->tcfv_push_vid;
 72                 /* replace prio bits, if tcfv_push_prio specified */
 73                 if (p->tcfv_push_prio) {
 74                         tci &= ~VLAN_PRIO_MASK;
 75                         tci |= p->tcfv_push_prio << VLAN_PRIO_SHIFT;
 76                 }
 77                 /* put updated tci as hwaccel tag */
 78                 __vlan_hwaccel_put_tag(skb, p->tcfv_push_proto, tci);
 79                 break;
 80         default:
 81                 BUG();
 82         }
 83 
 84 out:
 85         if (skb_at_tc_ingress(skb))
 86                 skb_pull_rcsum(skb, skb->mac_len);
 87 
 88         return action;
 89 
 90 drop:
 91         tcf_action_inc_drop_qstats(&v->common);
 92         return TC_ACT_SHOT;
 93 }
 94 
 95 static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = {
 96         [TCA_VLAN_PARMS]                = { .len = sizeof(struct tc_vlan) },
 97         [TCA_VLAN_PUSH_VLAN_ID]         = { .type = NLA_U16 },
 98         [TCA_VLAN_PUSH_VLAN_PROTOCOL]   = { .type = NLA_U16 },
 99         [TCA_VLAN_PUSH_VLAN_PRIORITY]   = { .type = NLA_U8 },
100 };
101 
102 static int tcf_vlan_init(struct net *net, struct nlattr *nla,
103                          struct nlattr *est, struct tc_action **a,
104                          int ovr, int bind, bool rtnl_held,
105                          struct tcf_proto *tp, u32 flags,
106                          struct netlink_ext_ack *extack)
107 {
108         struct tc_action_net *tn = net_generic(net, vlan_net_id);
109         struct nlattr *tb[TCA_VLAN_MAX + 1];
110         struct tcf_chain *goto_ch = NULL;
111         struct tcf_vlan_params *p;
112         struct tc_vlan *parm;
113         struct tcf_vlan *v;
114         int action;
115         u16 push_vid = 0;
116         __be16 push_proto = 0;
117         u8 push_prio = 0;
118         bool exists = false;
119         int ret = 0, err;
120         u32 index;
121 
122         if (!nla)
123                 return -EINVAL;
124 
125         err = nla_parse_nested_deprecated(tb, TCA_VLAN_MAX, nla, vlan_policy,
126                                           NULL);
127         if (err < 0)
128                 return err;
129 
130         if (!tb[TCA_VLAN_PARMS])
131                 return -EINVAL;
132         parm = nla_data(tb[TCA_VLAN_PARMS]);
133         index = parm->index;
134         err = tcf_idr_check_alloc(tn, &index, a, bind);
135         if (err < 0)
136                 return err;
137         exists = err;
138         if (exists && bind)
139                 return 0;
140 
141         switch (parm->v_action) {
142         case TCA_VLAN_ACT_POP:
143                 break;
144         case TCA_VLAN_ACT_PUSH:
145         case TCA_VLAN_ACT_MODIFY:
146                 if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
147                         if (exists)
148                                 tcf_idr_release(*a, bind);
149                         else
150                                 tcf_idr_cleanup(tn, index);
151                         return -EINVAL;
152                 }
153                 push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
154                 if (push_vid >= VLAN_VID_MASK) {
155                         if (exists)
156                                 tcf_idr_release(*a, bind);
157                         else
158                                 tcf_idr_cleanup(tn, index);
159                         return -ERANGE;
160                 }
161 
162                 if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
163                         push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
164                         switch (push_proto) {
165                         case htons(ETH_P_8021Q):
166                         case htons(ETH_P_8021AD):
167                                 break;
168                         default:
169                                 if (exists)
170                                         tcf_idr_release(*a, bind);
171                                 else
172                                         tcf_idr_cleanup(tn, index);
173                                 return -EPROTONOSUPPORT;
174                         }
175                 } else {
176                         push_proto = htons(ETH_P_8021Q);
177                 }
178 
179                 if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY])
180                         push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
181                 break;
182         default:
183                 if (exists)
184                         tcf_idr_release(*a, bind);
185                 else
186                         tcf_idr_cleanup(tn, index);
187                 return -EINVAL;
188         }
189         action = parm->v_action;
190 
191         if (!exists) {
192                 ret = tcf_idr_create_from_flags(tn, index, est, a,
193                                                 &act_vlan_ops, bind, flags);
194                 if (ret) {
195                         tcf_idr_cleanup(tn, index);
196                         return ret;
197                 }
198 
199                 ret = ACT_P_CREATED;
200         } else if (!ovr) {
201                 tcf_idr_release(*a, bind);
202                 return -EEXIST;
203         }
204 
205         err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
206         if (err < 0)
207                 goto release_idr;
208 
209         v = to_vlan(*a);
210 
211         p = kzalloc(sizeof(*p), GFP_KERNEL);
212         if (!p) {
213                 err = -ENOMEM;
214                 goto put_chain;
215         }
216 
217         p->tcfv_action = action;
218         p->tcfv_push_vid = push_vid;
219         p->tcfv_push_prio = push_prio;
220         p->tcfv_push_proto = push_proto;
221 
222         spin_lock_bh(&v->tcf_lock);
223         goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
224         p = rcu_replace_pointer(v->vlan_p, p, lockdep_is_held(&v->tcf_lock));
225         spin_unlock_bh(&v->tcf_lock);
226 
227         if (goto_ch)
228                 tcf_chain_put_by_act(goto_ch);
229         if (p)
230                 kfree_rcu(p, rcu);
231 
232         if (ret == ACT_P_CREATED)
233                 tcf_idr_insert(tn, *a);
234         return ret;
235 put_chain:
236         if (goto_ch)
237                 tcf_chain_put_by_act(goto_ch);
238 release_idr:
239         tcf_idr_release(*a, bind);
240         return err;
241 }
242 
243 static void tcf_vlan_cleanup(struct tc_action *a)
244 {
245         struct tcf_vlan *v = to_vlan(a);
246         struct tcf_vlan_params *p;
247 
248         p = rcu_dereference_protected(v->vlan_p, 1);
249         if (p)
250                 kfree_rcu(p, rcu);
251 }
252 
253 static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,
254                          int bind, int ref)
255 {
256         unsigned char *b = skb_tail_pointer(skb);
257         struct tcf_vlan *v = to_vlan(a);
258         struct tcf_vlan_params *p;
259         struct tc_vlan opt = {
260                 .index    = v->tcf_index,
261                 .refcnt   = refcount_read(&v->tcf_refcnt) - ref,
262                 .bindcnt  = atomic_read(&v->tcf_bindcnt) - bind,
263         };
264         struct tcf_t t;
265 
266         spin_lock_bh(&v->tcf_lock);
267         opt.action = v->tcf_action;
268         p = rcu_dereference_protected(v->vlan_p, lockdep_is_held(&v->tcf_lock));
269         opt.v_action = p->tcfv_action;
270         if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
271                 goto nla_put_failure;
272 
273         if ((p->tcfv_action == TCA_VLAN_ACT_PUSH ||
274              p->tcfv_action == TCA_VLAN_ACT_MODIFY) &&
275             (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, p->tcfv_push_vid) ||
276              nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL,
277                           p->tcfv_push_proto) ||
278              (nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY,
279                                               p->tcfv_push_prio))))
280                 goto nla_put_failure;
281 
282         tcf_tm_dump(&t, &v->tcf_tm);
283         if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD))
284                 goto nla_put_failure;
285         spin_unlock_bh(&v->tcf_lock);
286 
287         return skb->len;
288 
289 nla_put_failure:
290         spin_unlock_bh(&v->tcf_lock);
291         nlmsg_trim(skb, b);
292         return -1;
293 }
294 
295 static int tcf_vlan_walker(struct net *net, struct sk_buff *skb,
296                            struct netlink_callback *cb, int type,
297                            const struct tc_action_ops *ops,
298                            struct netlink_ext_ack *extack)
299 {
300         struct tc_action_net *tn = net_generic(net, vlan_net_id);
301 
302         return tcf_generic_walker(tn, skb, cb, type, ops, extack);
303 }
304 
305 static void tcf_vlan_stats_update(struct tc_action *a, u64 bytes, u32 packets,
306                                   u64 lastuse, bool hw)
307 {
308         struct tcf_vlan *v = to_vlan(a);
309         struct tcf_t *tm = &v->tcf_tm;
310 
311         tcf_action_update_stats(a, bytes, packets, false, hw);
312         tm->lastuse = max_t(u64, tm->lastuse, lastuse);
313 }
314 
315 static int tcf_vlan_search(struct net *net, struct tc_action **a, u32 index)
316 {
317         struct tc_action_net *tn = net_generic(net, vlan_net_id);
318 
319         return tcf_idr_search(tn, a, index);
320 }
321 
322 static size_t tcf_vlan_get_fill_size(const struct tc_action *act)
323 {
324         return nla_total_size(sizeof(struct tc_vlan))
325                 + nla_total_size(sizeof(u16)) /* TCA_VLAN_PUSH_VLAN_ID */
326                 + nla_total_size(sizeof(u16)) /* TCA_VLAN_PUSH_VLAN_PROTOCOL */
327                 + nla_total_size(sizeof(u8)); /* TCA_VLAN_PUSH_VLAN_PRIORITY */
328 }
329 
330 static struct tc_action_ops act_vlan_ops = {
331         .kind           =       "vlan",
332         .id             =       TCA_ID_VLAN,
333         .owner          =       THIS_MODULE,
334         .act            =       tcf_vlan_act,
335         .dump           =       tcf_vlan_dump,
336         .init           =       tcf_vlan_init,
337         .cleanup        =       tcf_vlan_cleanup,
338         .walk           =       tcf_vlan_walker,
339         .stats_update   =       tcf_vlan_stats_update,
340         .get_fill_size  =       tcf_vlan_get_fill_size,
341         .lookup         =       tcf_vlan_search,
342         .size           =       sizeof(struct tcf_vlan),
343 };
344 
345 static __net_init int vlan_init_net(struct net *net)
346 {
347         struct tc_action_net *tn = net_generic(net, vlan_net_id);
348 
349         return tc_action_net_init(net, tn, &act_vlan_ops);
350 }
351 
352 static void __net_exit vlan_exit_net(struct list_head *net_list)
353 {
354         tc_action_net_exit(net_list, vlan_net_id);
355 }
356 
357 static struct pernet_operations vlan_net_ops = {
358         .init = vlan_init_net,
359         .exit_batch = vlan_exit_net,
360         .id   = &vlan_net_id,
361         .size = sizeof(struct tc_action_net),
362 };
363 
364 static int __init vlan_init_module(void)
365 {
366         return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
367 }
368 
369 static void __exit vlan_cleanup_module(void)
370 {
371         tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
372 }
373 
374 module_init(vlan_init_module);
375 module_exit(vlan_cleanup_module);
376 
377 MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
378 MODULE_DESCRIPTION("vlan manipulation actions");
379 MODULE_LICENSE("GPL v2");
380 

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