]>
Commit | Line | Data |
---|---|---|
2a2ea508 JH |
1 | // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
2 | /* Copyright (C) 2019 Netronome Systems, Inc. */ | |
3 | ||
040b5cfb | 4 | #include <linux/if_arp.h> |
2a2ea508 JH |
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; | |
fa4e0f88 | 59 | int ret, mac_len; |
2a2ea508 JH |
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 | */ | |
fa4e0f88 | 67 | if (skb_at_tc_ingress(skb)) { |
2a2ea508 | 68 | skb_push_rcsum(skb, skb->mac_len); |
fa4e0f88 DC |
69 | mac_len = skb->mac_len; |
70 | } else { | |
71 | mac_len = skb_network_header(skb) - skb_mac_header(skb); | |
72 | } | |
2a2ea508 JH |
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: | |
040b5cfb MV |
80 | if (skb_mpls_pop(skb, p->tcfm_proto, mac_len, |
81 | skb->dev && skb->dev->type == ARPHRD_ETHER)) | |
2a2ea508 JH |
82 | goto drop; |
83 | break; | |
84 | case TCA_MPLS_ACT_PUSH: | |
d7bf2ebe | 85 | new_lse = tcf_mpls_get_lse(NULL, p, !eth_p_mpls(skb_protocol(skb, true))); |
d04ac224 MV |
86 | if (skb_mpls_push(skb, new_lse, p->tcfm_proto, mac_len, |
87 | skb->dev && skb->dev->type == ARPHRD_ETHER)) | |
2a2ea508 JH |
88 | goto drop; |
89 | break; | |
a45294af GN |
90 | case TCA_MPLS_ACT_MAC_PUSH: |
91 | if (skb_vlan_tag_present(skb)) { | |
92 | if (__vlan_insert_inner_tag(skb, skb->vlan_proto, | |
93 | skb_vlan_tag_get(skb), | |
94 | ETH_HLEN) < 0) | |
95 | goto drop; | |
96 | ||
97 | skb->protocol = skb->vlan_proto; | |
98 | __vlan_hwaccel_clear_tag(skb); | |
99 | } | |
100 | ||
101 | new_lse = tcf_mpls_get_lse(NULL, p, mac_len || | |
102 | !eth_p_mpls(skb->protocol)); | |
103 | ||
104 | if (skb_mpls_push(skb, new_lse, p->tcfm_proto, 0, false)) | |
105 | goto drop; | |
106 | break; | |
2a2ea508 | 107 | case TCA_MPLS_ACT_MODIFY: |
9608fa65 DC |
108 | if (!pskb_may_pull(skb, |
109 | skb_network_offset(skb) + MPLS_HLEN)) | |
110 | goto drop; | |
2a2ea508 JH |
111 | new_lse = tcf_mpls_get_lse(mpls_hdr(skb), p, false); |
112 | if (skb_mpls_update_lse(skb, new_lse)) | |
113 | goto drop; | |
114 | break; | |
115 | case TCA_MPLS_ACT_DEC_TTL: | |
116 | if (skb_mpls_dec_ttl(skb)) | |
117 | goto drop; | |
118 | break; | |
119 | } | |
120 | ||
121 | if (skb_at_tc_ingress(skb)) | |
122 | skb_pull_rcsum(skb, skb->mac_len); | |
123 | ||
124 | return ret; | |
125 | ||
126 | drop: | |
127 | qstats_drop_inc(this_cpu_ptr(m->common.cpu_qstats)); | |
128 | return TC_ACT_SHOT; | |
129 | } | |
130 | ||
131 | static int valid_label(const struct nlattr *attr, | |
132 | struct netlink_ext_ack *extack) | |
133 | { | |
134 | const u32 *label = nla_data(attr); | |
135 | ||
136 | if (*label & ~MPLS_LABEL_MASK || *label == MPLS_LABEL_IMPLNULL) { | |
137 | NL_SET_ERR_MSG_MOD(extack, "MPLS label out of range"); | |
138 | return -EINVAL; | |
139 | } | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | static const struct nla_policy mpls_policy[TCA_MPLS_MAX + 1] = { | |
2a2ea508 JH |
145 | [TCA_MPLS_PARMS] = NLA_POLICY_EXACT_LEN(sizeof(struct tc_mpls)), |
146 | [TCA_MPLS_PROTO] = { .type = NLA_U16 }, | |
147 | [TCA_MPLS_LABEL] = NLA_POLICY_VALIDATE_FN(NLA_U32, valid_label), | |
148 | [TCA_MPLS_TC] = NLA_POLICY_RANGE(NLA_U8, 0, 7), | |
149 | [TCA_MPLS_TTL] = NLA_POLICY_MIN(NLA_U8, 1), | |
150 | [TCA_MPLS_BOS] = NLA_POLICY_RANGE(NLA_U8, 0, 1), | |
151 | }; | |
152 | ||
153 | static int tcf_mpls_init(struct net *net, struct nlattr *nla, | |
154 | struct nlattr *est, struct tc_action **a, | |
abbb0d33 VB |
155 | struct tcf_proto *tp, u32 flags, |
156 | struct netlink_ext_ack *extack) | |
2a2ea508 JH |
157 | { |
158 | struct tc_action_net *tn = net_generic(net, mpls_net_id); | |
695176bf | 159 | bool bind = flags & TCA_ACT_FLAGS_BIND; |
2a2ea508 JH |
160 | struct nlattr *tb[TCA_MPLS_MAX + 1]; |
161 | struct tcf_chain *goto_ch = NULL; | |
162 | struct tcf_mpls_params *p; | |
163 | struct tc_mpls *parm; | |
164 | bool exists = false; | |
165 | struct tcf_mpls *m; | |
166 | int ret = 0, err; | |
167 | u8 mpls_ttl = 0; | |
7be8ef2c | 168 | u32 index; |
2a2ea508 JH |
169 | |
170 | if (!nla) { | |
171 | NL_SET_ERR_MSG_MOD(extack, "Missing netlink attributes"); | |
172 | return -EINVAL; | |
173 | } | |
174 | ||
175 | err = nla_parse_nested(tb, TCA_MPLS_MAX, nla, mpls_policy, extack); | |
176 | if (err < 0) | |
177 | return err; | |
178 | ||
179 | if (!tb[TCA_MPLS_PARMS]) { | |
180 | NL_SET_ERR_MSG_MOD(extack, "No MPLS params"); | |
181 | return -EINVAL; | |
182 | } | |
183 | parm = nla_data(tb[TCA_MPLS_PARMS]); | |
7be8ef2c | 184 | index = parm->index; |
2a2ea508 JH |
185 | |
186 | /* Verify parameters against action type. */ | |
187 | switch (parm->m_action) { | |
188 | case TCA_MPLS_ACT_POP: | |
189 | if (!tb[TCA_MPLS_PROTO]) { | |
190 | NL_SET_ERR_MSG_MOD(extack, "Protocol must be set for MPLS pop"); | |
191 | return -EINVAL; | |
192 | } | |
193 | if (!eth_proto_is_802_3(nla_get_be16(tb[TCA_MPLS_PROTO]))) { | |
194 | NL_SET_ERR_MSG_MOD(extack, "Invalid protocol type for MPLS pop"); | |
195 | return -EINVAL; | |
196 | } | |
197 | if (tb[TCA_MPLS_LABEL] || tb[TCA_MPLS_TTL] || tb[TCA_MPLS_TC] || | |
198 | tb[TCA_MPLS_BOS]) { | |
199 | NL_SET_ERR_MSG_MOD(extack, "Label, TTL, TC or BOS cannot be used with MPLS pop"); | |
200 | return -EINVAL; | |
201 | } | |
202 | break; | |
203 | case TCA_MPLS_ACT_DEC_TTL: | |
204 | if (tb[TCA_MPLS_PROTO] || tb[TCA_MPLS_LABEL] || | |
205 | tb[TCA_MPLS_TTL] || tb[TCA_MPLS_TC] || tb[TCA_MPLS_BOS]) { | |
206 | NL_SET_ERR_MSG_MOD(extack, "Label, TTL, TC, BOS or protocol cannot be used with MPLS dec_ttl"); | |
207 | return -EINVAL; | |
208 | } | |
209 | break; | |
210 | case TCA_MPLS_ACT_PUSH: | |
a45294af | 211 | case TCA_MPLS_ACT_MAC_PUSH: |
2a2ea508 JH |
212 | if (!tb[TCA_MPLS_LABEL]) { |
213 | NL_SET_ERR_MSG_MOD(extack, "Label is required for MPLS push"); | |
214 | return -EINVAL; | |
215 | } | |
216 | if (tb[TCA_MPLS_PROTO] && | |
217 | !eth_p_mpls(nla_get_be16(tb[TCA_MPLS_PROTO]))) { | |
218 | NL_SET_ERR_MSG_MOD(extack, "Protocol must be an MPLS type for MPLS push"); | |
219 | return -EPROTONOSUPPORT; | |
220 | } | |
221 | /* Push needs a TTL - if not specified, set a default value. */ | |
222 | if (!tb[TCA_MPLS_TTL]) { | |
223 | #if IS_ENABLED(CONFIG_MPLS) | |
224 | mpls_ttl = net->mpls.default_ttl ? | |
225 | net->mpls.default_ttl : ACT_MPLS_TTL_DEFAULT; | |
226 | #else | |
227 | mpls_ttl = ACT_MPLS_TTL_DEFAULT; | |
228 | #endif | |
229 | } | |
230 | break; | |
231 | case TCA_MPLS_ACT_MODIFY: | |
232 | if (tb[TCA_MPLS_PROTO]) { | |
233 | NL_SET_ERR_MSG_MOD(extack, "Protocol cannot be used with MPLS modify"); | |
234 | return -EINVAL; | |
235 | } | |
236 | break; | |
237 | default: | |
238 | NL_SET_ERR_MSG_MOD(extack, "Unknown MPLS action"); | |
239 | return -EINVAL; | |
240 | } | |
241 | ||
7be8ef2c | 242 | err = tcf_idr_check_alloc(tn, &index, a, bind); |
2a2ea508 JH |
243 | if (err < 0) |
244 | return err; | |
245 | exists = err; | |
246 | if (exists && bind) | |
247 | return 0; | |
248 | ||
249 | if (!exists) { | |
7be8ef2c | 250 | ret = tcf_idr_create(tn, index, est, a, |
e3822678 | 251 | &act_mpls_ops, bind, true, 0); |
2a2ea508 | 252 | if (ret) { |
7be8ef2c | 253 | tcf_idr_cleanup(tn, index); |
2a2ea508 JH |
254 | return ret; |
255 | } | |
256 | ||
257 | ret = ACT_P_CREATED; | |
695176bf | 258 | } else if (!(flags & TCA_ACT_FLAGS_REPLACE)) { |
2a2ea508 JH |
259 | tcf_idr_release(*a, bind); |
260 | return -EEXIST; | |
261 | } | |
262 | ||
263 | err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); | |
264 | if (err < 0) | |
265 | goto release_idr; | |
266 | ||
267 | m = to_mpls(*a); | |
268 | ||
269 | p = kzalloc(sizeof(*p), GFP_KERNEL); | |
270 | if (!p) { | |
271 | err = -ENOMEM; | |
272 | goto put_chain; | |
273 | } | |
274 | ||
275 | p->tcfm_action = parm->m_action; | |
276 | p->tcfm_label = tb[TCA_MPLS_LABEL] ? nla_get_u32(tb[TCA_MPLS_LABEL]) : | |
277 | ACT_MPLS_LABEL_NOT_SET; | |
278 | p->tcfm_tc = tb[TCA_MPLS_TC] ? nla_get_u8(tb[TCA_MPLS_TC]) : | |
279 | ACT_MPLS_TC_NOT_SET; | |
280 | p->tcfm_ttl = tb[TCA_MPLS_TTL] ? nla_get_u8(tb[TCA_MPLS_TTL]) : | |
281 | mpls_ttl; | |
282 | p->tcfm_bos = tb[TCA_MPLS_BOS] ? nla_get_u8(tb[TCA_MPLS_BOS]) : | |
283 | ACT_MPLS_BOS_NOT_SET; | |
284 | p->tcfm_proto = tb[TCA_MPLS_PROTO] ? nla_get_be16(tb[TCA_MPLS_PROTO]) : | |
285 | htons(ETH_P_MPLS_UC); | |
286 | ||
287 | spin_lock_bh(&m->tcf_lock); | |
288 | goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); | |
445d3749 | 289 | p = rcu_replace_pointer(m->mpls_p, p, lockdep_is_held(&m->tcf_lock)); |
2a2ea508 JH |
290 | spin_unlock_bh(&m->tcf_lock); |
291 | ||
292 | if (goto_ch) | |
293 | tcf_chain_put_by_act(goto_ch); | |
294 | if (p) | |
295 | kfree_rcu(p, rcu); | |
296 | ||
2a2ea508 JH |
297 | return ret; |
298 | put_chain: | |
299 | if (goto_ch) | |
300 | tcf_chain_put_by_act(goto_ch); | |
301 | release_idr: | |
302 | tcf_idr_release(*a, bind); | |
303 | return err; | |
304 | } | |
305 | ||
306 | static void tcf_mpls_cleanup(struct tc_action *a) | |
307 | { | |
308 | struct tcf_mpls *m = to_mpls(a); | |
309 | struct tcf_mpls_params *p; | |
310 | ||
311 | p = rcu_dereference_protected(m->mpls_p, 1); | |
312 | if (p) | |
313 | kfree_rcu(p, rcu); | |
314 | } | |
315 | ||
316 | static int tcf_mpls_dump(struct sk_buff *skb, struct tc_action *a, | |
317 | int bind, int ref) | |
318 | { | |
319 | unsigned char *b = skb_tail_pointer(skb); | |
320 | struct tcf_mpls *m = to_mpls(a); | |
321 | struct tcf_mpls_params *p; | |
322 | struct tc_mpls opt = { | |
323 | .index = m->tcf_index, | |
324 | .refcnt = refcount_read(&m->tcf_refcnt) - ref, | |
325 | .bindcnt = atomic_read(&m->tcf_bindcnt) - bind, | |
326 | }; | |
327 | struct tcf_t t; | |
328 | ||
329 | spin_lock_bh(&m->tcf_lock); | |
330 | opt.action = m->tcf_action; | |
331 | p = rcu_dereference_protected(m->mpls_p, lockdep_is_held(&m->tcf_lock)); | |
332 | opt.m_action = p->tcfm_action; | |
333 | ||
334 | if (nla_put(skb, TCA_MPLS_PARMS, sizeof(opt), &opt)) | |
335 | goto nla_put_failure; | |
336 | ||
337 | if (p->tcfm_label != ACT_MPLS_LABEL_NOT_SET && | |
338 | nla_put_u32(skb, TCA_MPLS_LABEL, p->tcfm_label)) | |
339 | goto nla_put_failure; | |
340 | ||
341 | if (p->tcfm_tc != ACT_MPLS_TC_NOT_SET && | |
342 | nla_put_u8(skb, TCA_MPLS_TC, p->tcfm_tc)) | |
343 | goto nla_put_failure; | |
344 | ||
345 | if (p->tcfm_ttl && nla_put_u8(skb, TCA_MPLS_TTL, p->tcfm_ttl)) | |
346 | goto nla_put_failure; | |
347 | ||
348 | if (p->tcfm_bos != ACT_MPLS_BOS_NOT_SET && | |
349 | nla_put_u8(skb, TCA_MPLS_BOS, p->tcfm_bos)) | |
350 | goto nla_put_failure; | |
351 | ||
352 | if (nla_put_be16(skb, TCA_MPLS_PROTO, p->tcfm_proto)) | |
353 | goto nla_put_failure; | |
354 | ||
355 | tcf_tm_dump(&t, &m->tcf_tm); | |
356 | ||
357 | if (nla_put_64bit(skb, TCA_MPLS_TM, sizeof(t), &t, TCA_MPLS_PAD)) | |
358 | goto nla_put_failure; | |
359 | ||
360 | spin_unlock_bh(&m->tcf_lock); | |
361 | ||
362 | return skb->len; | |
363 | ||
364 | nla_put_failure: | |
365 | spin_unlock_bh(&m->tcf_lock); | |
366 | nlmsg_trim(skb, b); | |
367 | return -EMSGSIZE; | |
368 | } | |
369 | ||
370 | static int tcf_mpls_walker(struct net *net, struct sk_buff *skb, | |
371 | struct netlink_callback *cb, int type, | |
372 | const struct tc_action_ops *ops, | |
373 | struct netlink_ext_ack *extack) | |
374 | { | |
375 | struct tc_action_net *tn = net_generic(net, mpls_net_id); | |
376 | ||
377 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); | |
378 | } | |
379 | ||
380 | static int tcf_mpls_search(struct net *net, struct tc_action **a, u32 index) | |
381 | { | |
382 | struct tc_action_net *tn = net_generic(net, mpls_net_id); | |
383 | ||
384 | return tcf_idr_search(tn, a, index); | |
385 | } | |
386 | ||
387 | static struct tc_action_ops act_mpls_ops = { | |
388 | .kind = "mpls", | |
389 | .id = TCA_ID_MPLS, | |
390 | .owner = THIS_MODULE, | |
391 | .act = tcf_mpls_act, | |
392 | .dump = tcf_mpls_dump, | |
393 | .init = tcf_mpls_init, | |
394 | .cleanup = tcf_mpls_cleanup, | |
395 | .walk = tcf_mpls_walker, | |
396 | .lookup = tcf_mpls_search, | |
397 | .size = sizeof(struct tcf_mpls), | |
398 | }; | |
399 | ||
400 | static __net_init int mpls_init_net(struct net *net) | |
401 | { | |
402 | struct tc_action_net *tn = net_generic(net, mpls_net_id); | |
403 | ||
981471bd | 404 | return tc_action_net_init(net, tn, &act_mpls_ops); |
2a2ea508 JH |
405 | } |
406 | ||
407 | static void __net_exit mpls_exit_net(struct list_head *net_list) | |
408 | { | |
409 | tc_action_net_exit(net_list, mpls_net_id); | |
410 | } | |
411 | ||
412 | static struct pernet_operations mpls_net_ops = { | |
413 | .init = mpls_init_net, | |
414 | .exit_batch = mpls_exit_net, | |
415 | .id = &mpls_net_id, | |
416 | .size = sizeof(struct tc_action_net), | |
417 | }; | |
418 | ||
419 | static int __init mpls_init_module(void) | |
420 | { | |
421 | return tcf_register_action(&act_mpls_ops, &mpls_net_ops); | |
422 | } | |
423 | ||
424 | static void __exit mpls_cleanup_module(void) | |
425 | { | |
426 | tcf_unregister_action(&act_mpls_ops, &mpls_net_ops); | |
427 | } | |
428 | ||
429 | module_init(mpls_init_module); | |
430 | module_exit(mpls_cleanup_module); | |
431 | ||
501b72ae | 432 | MODULE_SOFTDEP("post: mpls_gso"); |
2a2ea508 JH |
433 | MODULE_AUTHOR("Netronome Systems <oss-drivers@netronome.com>"); |
434 | MODULE_LICENSE("GPL"); | |
435 | MODULE_DESCRIPTION("MPLS manipulation actions"); |