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