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TOMOYO Linux Cross Reference
Linux/net/sched/act_mpls.c

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  1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
  2 /* Copyright (C) 2019 Netronome Systems, Inc. */
  3 
  4 #include <linux/if_arp.h>
  5 #include <linux/init.h>
  6 #include <linux/kernel.h>
  7 #include <linux/module.h>
  8 #include <linux/mpls.h>
  9 #include <linux/rtnetlink.h>
 10 #include <linux/skbuff.h>
 11 #include <linux/tc_act/tc_mpls.h>
 12 #include <net/mpls.h>
 13 #include <net/netlink.h>
 14 #include <net/pkt_sched.h>
 15 #include <net/pkt_cls.h>
 16 #include <net/tc_act/tc_mpls.h>
 17 
 18 static unsigned int mpls_net_id;
 19 static struct tc_action_ops act_mpls_ops;
 20 
 21 #define ACT_MPLS_TTL_DEFAULT    255
 22 
 23 static __be32 tcf_mpls_get_lse(struct mpls_shim_hdr *lse,
 24                                struct tcf_mpls_params *p, bool set_bos)
 25 {
 26         u32 new_lse = 0;
 27 
 28         if (lse)
 29                 new_lse = be32_to_cpu(lse->label_stack_entry);
 30 
 31         if (p->tcfm_label != ACT_MPLS_LABEL_NOT_SET) {
 32                 new_lse &= ~MPLS_LS_LABEL_MASK;
 33                 new_lse |= p->tcfm_label << MPLS_LS_LABEL_SHIFT;
 34         }
 35         if (p->tcfm_ttl) {
 36                 new_lse &= ~MPLS_LS_TTL_MASK;
 37                 new_lse |= p->tcfm_ttl << MPLS_LS_TTL_SHIFT;
 38         }
 39         if (p->tcfm_tc != ACT_MPLS_TC_NOT_SET) {
 40                 new_lse &= ~MPLS_LS_TC_MASK;
 41                 new_lse |= p->tcfm_tc << MPLS_LS_TC_SHIFT;
 42         }
 43         if (p->tcfm_bos != ACT_MPLS_BOS_NOT_SET) {
 44                 new_lse &= ~MPLS_LS_S_MASK;
 45                 new_lse |= p->tcfm_bos << MPLS_LS_S_SHIFT;
 46         } else if (set_bos) {
 47                 new_lse |= 1 << MPLS_LS_S_SHIFT;
 48         }
 49 
 50         return cpu_to_be32(new_lse);
 51 }
 52 
 53 static int tcf_mpls_act(struct sk_buff *skb, const struct tc_action *a,
 54                         struct tcf_result *res)
 55 {
 56         struct tcf_mpls *m = to_mpls(a);
 57         struct tcf_mpls_params *p;
 58         __be32 new_lse;
 59         int ret, mac_len;
 60 
 61         tcf_lastuse_update(&m->tcf_tm);
 62         bstats_cpu_update(this_cpu_ptr(m->common.cpu_bstats), skb);
 63 
 64         /* Ensure 'data' points at mac_header prior calling mpls manipulating
 65          * functions.
 66          */
 67         if (skb_at_tc_ingress(skb)) {
 68                 skb_push_rcsum(skb, skb->mac_len);
 69                 mac_len = skb->mac_len;
 70         } else {
 71                 mac_len = skb_network_header(skb) - skb_mac_header(skb);
 72         }
 73 
 74         ret = READ_ONCE(m->tcf_action);
 75 
 76         p = rcu_dereference_bh(m->mpls_p);
 77 
 78         switch (p->tcfm_action) {
 79         case TCA_MPLS_ACT_POP:
 80                 if (skb_mpls_pop(skb, p->tcfm_proto, mac_len,
 81                                  skb->dev && skb->dev->type == ARPHRD_ETHER))
 82                         goto drop;
 83                 break;
 84         case TCA_MPLS_ACT_PUSH:
 85                 new_lse = tcf_mpls_get_lse(NULL, p, !eth_p_mpls(skb->protocol));
 86                 if (skb_mpls_push(skb, new_lse, p->tcfm_proto, mac_len,
 87                                   skb->dev && skb->dev->type == ARPHRD_ETHER))
 88                         goto drop;
 89                 break;
 90         case TCA_MPLS_ACT_MODIFY:
 91                 new_lse = tcf_mpls_get_lse(mpls_hdr(skb), p, false);
 92                 if (skb_mpls_update_lse(skb, new_lse))
 93                         goto drop;
 94                 break;
 95         case TCA_MPLS_ACT_DEC_TTL:
 96                 if (skb_mpls_dec_ttl(skb))
 97                         goto drop;
 98                 break;
 99         }
100 
101         if (skb_at_tc_ingress(skb))
102                 skb_pull_rcsum(skb, skb->mac_len);
103 
104         return ret;
105 
106 drop:
107         qstats_drop_inc(this_cpu_ptr(m->common.cpu_qstats));
108         return TC_ACT_SHOT;
109 }
110 
111 static int valid_label(const struct nlattr *attr,
112                        struct netlink_ext_ack *extack)
113 {
114         const u32 *label = nla_data(attr);
115 
116         if (*label & ~MPLS_LABEL_MASK || *label == MPLS_LABEL_IMPLNULL) {
117                 NL_SET_ERR_MSG_MOD(extack, "MPLS label out of range");
118                 return -EINVAL;
119         }
120 
121         return 0;
122 }
123 
124 static const struct nla_policy mpls_policy[TCA_MPLS_MAX + 1] = {
125         [TCA_MPLS_UNSPEC]       = { .strict_start_type = TCA_MPLS_UNSPEC + 1 },
126         [TCA_MPLS_PARMS]        = NLA_POLICY_EXACT_LEN(sizeof(struct tc_mpls)),
127         [TCA_MPLS_PROTO]        = { .type = NLA_U16 },
128         [TCA_MPLS_LABEL]        = NLA_POLICY_VALIDATE_FN(NLA_U32, valid_label),
129         [TCA_MPLS_TC]           = NLA_POLICY_RANGE(NLA_U8, 0, 7),
130         [TCA_MPLS_TTL]          = NLA_POLICY_MIN(NLA_U8, 1),
131         [TCA_MPLS_BOS]          = NLA_POLICY_RANGE(NLA_U8, 0, 1),
132 };
133 
134 static int tcf_mpls_init(struct net *net, struct nlattr *nla,
135                          struct nlattr *est, struct tc_action **a,
136                          int ovr, int bind, bool rtnl_held,
137                          struct tcf_proto *tp, struct netlink_ext_ack *extack)
138 {
139         struct tc_action_net *tn = net_generic(net, mpls_net_id);
140         struct nlattr *tb[TCA_MPLS_MAX + 1];
141         struct tcf_chain *goto_ch = NULL;
142         struct tcf_mpls_params *p;
143         struct tc_mpls *parm;
144         bool exists = false;
145         struct tcf_mpls *m;
146         int ret = 0, err;
147         u8 mpls_ttl = 0;
148         u32 index;
149 
150         if (!nla) {
151                 NL_SET_ERR_MSG_MOD(extack, "Missing netlink attributes");
152                 return -EINVAL;
153         }
154 
155         err = nla_parse_nested(tb, TCA_MPLS_MAX, nla, mpls_policy, extack);
156         if (err < 0)
157                 return err;
158 
159         if (!tb[TCA_MPLS_PARMS]) {
160                 NL_SET_ERR_MSG_MOD(extack, "No MPLS params");
161                 return -EINVAL;
162         }
163         parm = nla_data(tb[TCA_MPLS_PARMS]);
164         index = parm->index;
165 
166         /* Verify parameters against action type. */
167         switch (parm->m_action) {
168         case TCA_MPLS_ACT_POP:
169                 if (!tb[TCA_MPLS_PROTO]) {
170                         NL_SET_ERR_MSG_MOD(extack, "Protocol must be set for MPLS pop");
171                         return -EINVAL;
172                 }
173                 if (!eth_proto_is_802_3(nla_get_be16(tb[TCA_MPLS_PROTO]))) {
174                         NL_SET_ERR_MSG_MOD(extack, "Invalid protocol type for MPLS pop");
175                         return -EINVAL;
176                 }
177                 if (tb[TCA_MPLS_LABEL] || tb[TCA_MPLS_TTL] || tb[TCA_MPLS_TC] ||
178                     tb[TCA_MPLS_BOS]) {
179                         NL_SET_ERR_MSG_MOD(extack, "Label, TTL, TC or BOS cannot be used with MPLS pop");
180                         return -EINVAL;
181                 }
182                 break;
183         case TCA_MPLS_ACT_DEC_TTL:
184                 if (tb[TCA_MPLS_PROTO] || tb[TCA_MPLS_LABEL] ||
185                     tb[TCA_MPLS_TTL] || tb[TCA_MPLS_TC] || tb[TCA_MPLS_BOS]) {
186                         NL_SET_ERR_MSG_MOD(extack, "Label, TTL, TC, BOS or protocol cannot be used with MPLS dec_ttl");
187                         return -EINVAL;
188                 }
189                 break;
190         case TCA_MPLS_ACT_PUSH:
191                 if (!tb[TCA_MPLS_LABEL]) {
192                         NL_SET_ERR_MSG_MOD(extack, "Label is required for MPLS push");
193                         return -EINVAL;
194                 }
195                 if (tb[TCA_MPLS_PROTO] &&
196                     !eth_p_mpls(nla_get_be16(tb[TCA_MPLS_PROTO]))) {
197                         NL_SET_ERR_MSG_MOD(extack, "Protocol must be an MPLS type for MPLS push");
198                         return -EPROTONOSUPPORT;
199                 }
200                 /* Push needs a TTL - if not specified, set a default value. */
201                 if (!tb[TCA_MPLS_TTL]) {
202 #if IS_ENABLED(CONFIG_MPLS)
203                         mpls_ttl = net->mpls.default_ttl ?
204                                    net->mpls.default_ttl : ACT_MPLS_TTL_DEFAULT;
205 #else
206                         mpls_ttl = ACT_MPLS_TTL_DEFAULT;
207 #endif
208                 }
209                 break;
210         case TCA_MPLS_ACT_MODIFY:
211                 if (tb[TCA_MPLS_PROTO]) {
212                         NL_SET_ERR_MSG_MOD(extack, "Protocol cannot be used with MPLS modify");
213                         return -EINVAL;
214                 }
215                 break;
216         default:
217                 NL_SET_ERR_MSG_MOD(extack, "Unknown MPLS action");
218                 return -EINVAL;
219         }
220 
221         err = tcf_idr_check_alloc(tn, &index, a, bind);
222         if (err < 0)
223                 return err;
224         exists = err;
225         if (exists && bind)
226                 return 0;
227 
228         if (!exists) {
229                 ret = tcf_idr_create(tn, index, est, a,
230                                      &act_mpls_ops, bind, true);
231                 if (ret) {
232                         tcf_idr_cleanup(tn, index);
233                         return ret;
234                 }
235 
236                 ret = ACT_P_CREATED;
237         } else if (!ovr) {
238                 tcf_idr_release(*a, bind);
239                 return -EEXIST;
240         }
241 
242         err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
243         if (err < 0)
244                 goto release_idr;
245 
246         m = to_mpls(*a);
247 
248         p = kzalloc(sizeof(*p), GFP_KERNEL);
249         if (!p) {
250                 err = -ENOMEM;
251                 goto put_chain;
252         }
253 
254         p->tcfm_action = parm->m_action;
255         p->tcfm_label = tb[TCA_MPLS_LABEL] ? nla_get_u32(tb[TCA_MPLS_LABEL]) :
256                                              ACT_MPLS_LABEL_NOT_SET;
257         p->tcfm_tc = tb[TCA_MPLS_TC] ? nla_get_u8(tb[TCA_MPLS_TC]) :
258                                        ACT_MPLS_TC_NOT_SET;
259         p->tcfm_ttl = tb[TCA_MPLS_TTL] ? nla_get_u8(tb[TCA_MPLS_TTL]) :
260                                          mpls_ttl;
261         p->tcfm_bos = tb[TCA_MPLS_BOS] ? nla_get_u8(tb[TCA_MPLS_BOS]) :
262                                          ACT_MPLS_BOS_NOT_SET;
263         p->tcfm_proto = tb[TCA_MPLS_PROTO] ? nla_get_be16(tb[TCA_MPLS_PROTO]) :
264                                              htons(ETH_P_MPLS_UC);
265 
266         spin_lock_bh(&m->tcf_lock);
267         goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
268         rcu_swap_protected(m->mpls_p, p, lockdep_is_held(&m->tcf_lock));
269         spin_unlock_bh(&m->tcf_lock);
270 
271         if (goto_ch)
272                 tcf_chain_put_by_act(goto_ch);
273         if (p)
274                 kfree_rcu(p, rcu);
275 
276         if (ret == ACT_P_CREATED)
277                 tcf_idr_insert(tn, *a);
278         return ret;
279 put_chain:
280         if (goto_ch)
281                 tcf_chain_put_by_act(goto_ch);
282 release_idr:
283         tcf_idr_release(*a, bind);
284         return err;
285 }
286 
287 static void tcf_mpls_cleanup(struct tc_action *a)
288 {
289         struct tcf_mpls *m = to_mpls(a);
290         struct tcf_mpls_params *p;
291 
292         p = rcu_dereference_protected(m->mpls_p, 1);
293         if (p)
294                 kfree_rcu(p, rcu);
295 }
296 
297 static int tcf_mpls_dump(struct sk_buff *skb, struct tc_action *a,
298                          int bind, int ref)
299 {
300         unsigned char *b = skb_tail_pointer(skb);
301         struct tcf_mpls *m = to_mpls(a);
302         struct tcf_mpls_params *p;
303         struct tc_mpls opt = {
304                 .index    = m->tcf_index,
305                 .refcnt   = refcount_read(&m->tcf_refcnt) - ref,
306                 .bindcnt  = atomic_read(&m->tcf_bindcnt) - bind,
307         };
308         struct tcf_t t;
309 
310         spin_lock_bh(&m->tcf_lock);
311         opt.action = m->tcf_action;
312         p = rcu_dereference_protected(m->mpls_p, lockdep_is_held(&m->tcf_lock));
313         opt.m_action = p->tcfm_action;
314 
315         if (nla_put(skb, TCA_MPLS_PARMS, sizeof(opt), &opt))
316                 goto nla_put_failure;
317 
318         if (p->tcfm_label != ACT_MPLS_LABEL_NOT_SET &&
319             nla_put_u32(skb, TCA_MPLS_LABEL, p->tcfm_label))
320                 goto nla_put_failure;
321 
322         if (p->tcfm_tc != ACT_MPLS_TC_NOT_SET &&
323             nla_put_u8(skb, TCA_MPLS_TC, p->tcfm_tc))
324                 goto nla_put_failure;
325 
326         if (p->tcfm_ttl && nla_put_u8(skb, TCA_MPLS_TTL, p->tcfm_ttl))
327                 goto nla_put_failure;
328 
329         if (p->tcfm_bos != ACT_MPLS_BOS_NOT_SET &&
330             nla_put_u8(skb, TCA_MPLS_BOS, p->tcfm_bos))
331                 goto nla_put_failure;
332 
333         if (nla_put_be16(skb, TCA_MPLS_PROTO, p->tcfm_proto))
334                 goto nla_put_failure;
335 
336         tcf_tm_dump(&t, &m->tcf_tm);
337 
338         if (nla_put_64bit(skb, TCA_MPLS_TM, sizeof(t), &t, TCA_MPLS_PAD))
339                 goto nla_put_failure;
340 
341         spin_unlock_bh(&m->tcf_lock);
342 
343         return skb->len;
344 
345 nla_put_failure:
346         spin_unlock_bh(&m->tcf_lock);
347         nlmsg_trim(skb, b);
348         return -EMSGSIZE;
349 }
350 
351 static int tcf_mpls_walker(struct net *net, struct sk_buff *skb,
352                            struct netlink_callback *cb, int type,
353                            const struct tc_action_ops *ops,
354                            struct netlink_ext_ack *extack)
355 {
356         struct tc_action_net *tn = net_generic(net, mpls_net_id);
357 
358         return tcf_generic_walker(tn, skb, cb, type, ops, extack);
359 }
360 
361 static int tcf_mpls_search(struct net *net, struct tc_action **a, u32 index)
362 {
363         struct tc_action_net *tn = net_generic(net, mpls_net_id);
364 
365         return tcf_idr_search(tn, a, index);
366 }
367 
368 static struct tc_action_ops act_mpls_ops = {
369         .kind           =       "mpls",
370         .id             =       TCA_ID_MPLS,
371         .owner          =       THIS_MODULE,
372         .act            =       tcf_mpls_act,
373         .dump           =       tcf_mpls_dump,
374         .init           =       tcf_mpls_init,
375         .cleanup        =       tcf_mpls_cleanup,
376         .walk           =       tcf_mpls_walker,
377         .lookup         =       tcf_mpls_search,
378         .size           =       sizeof(struct tcf_mpls),
379 };
380 
381 static __net_init int mpls_init_net(struct net *net)
382 {
383         struct tc_action_net *tn = net_generic(net, mpls_net_id);
384 
385         return tc_action_net_init(net, tn, &act_mpls_ops);
386 }
387 
388 static void __net_exit mpls_exit_net(struct list_head *net_list)
389 {
390         tc_action_net_exit(net_list, mpls_net_id);
391 }
392 
393 static struct pernet_operations mpls_net_ops = {
394         .init = mpls_init_net,
395         .exit_batch = mpls_exit_net,
396         .id   = &mpls_net_id,
397         .size = sizeof(struct tc_action_net),
398 };
399 
400 static int __init mpls_init_module(void)
401 {
402         return tcf_register_action(&act_mpls_ops, &mpls_net_ops);
403 }
404 
405 static void __exit mpls_cleanup_module(void)
406 {
407         tcf_unregister_action(&act_mpls_ops, &mpls_net_ops);
408 }
409 
410 module_init(mpls_init_module);
411 module_exit(mpls_cleanup_module);
412 
413 MODULE_AUTHOR("Netronome Systems <oss-drivers@netronome.com>");
414 MODULE_LICENSE("GPL");
415 MODULE_DESCRIPTION("MPLS manipulation actions");
416 

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