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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
d1df6fd8 DL |
2 | /* |
3 | * SR-IPv6 implementation | |
4 | * | |
004d4b27 | 5 | * Authors: |
d1df6fd8 | 6 | * David Lebrun <david.lebrun@uclouvain.be> |
004d4b27 | 7 | * eBPF support: Mathieu Xhonneux <m.xhonneux@gmail.com> |
d1df6fd8 DL |
8 | */ |
9 | ||
b6459415 | 10 | #include <linux/filter.h> |
d1df6fd8 DL |
11 | #include <linux/types.h> |
12 | #include <linux/skbuff.h> | |
13 | #include <linux/net.h> | |
14 | #include <linux/module.h> | |
15 | #include <net/ip.h> | |
16 | #include <net/lwtunnel.h> | |
17 | #include <net/netevent.h> | |
18 | #include <net/netns/generic.h> | |
19 | #include <net/ip6_fib.h> | |
20 | #include <net/route.h> | |
21 | #include <net/seg6.h> | |
22 | #include <linux/seg6.h> | |
23 | #include <linux/seg6_local.h> | |
24 | #include <net/addrconf.h> | |
25 | #include <net/ip6_route.h> | |
26 | #include <net/dst_cache.h> | |
62ebaeae | 27 | #include <net/ip_tunnels.h> |
d1df6fd8 DL |
28 | #ifdef CONFIG_IPV6_SEG6_HMAC |
29 | #include <net/seg6_hmac.h> | |
30 | #endif | |
1c1e761e | 31 | #include <net/seg6_local.h> |
891ef8dd | 32 | #include <linux/etherdevice.h> |
004d4b27 | 33 | #include <linux/bpf.h> |
7a3f5b0d | 34 | #include <linux/netfilter.h> |
d1df6fd8 | 35 | |
300a0fd8 AM |
36 | #define SEG6_F_ATTR(i) BIT(i) |
37 | ||
d1df6fd8 DL |
38 | struct seg6_local_lwt; |
39 | ||
cfdf64a0 AM |
40 | /* callbacks used for customizing the creation and destruction of a behavior */ |
41 | struct seg6_local_lwtunnel_ops { | |
42 | int (*build_state)(struct seg6_local_lwt *slwt, const void *cfg, | |
43 | struct netlink_ext_ack *extack); | |
44 | void (*destroy_state)(struct seg6_local_lwt *slwt); | |
45 | }; | |
46 | ||
d1df6fd8 DL |
47 | struct seg6_action_desc { |
48 | int action; | |
49 | unsigned long attrs; | |
0a3021f1 AM |
50 | |
51 | /* The optattrs field is used for specifying all the optional | |
52 | * attributes supported by a specific behavior. | |
53 | * It means that if one of these attributes is not provided in the | |
54 | * netlink message during the behavior creation, no errors will be | |
55 | * returned to the userspace. | |
56 | * | |
57 | * Each attribute can be only of two types (mutually exclusive): | |
58 | * 1) required or 2) optional. | |
59 | * Every user MUST obey to this rule! If you set an attribute as | |
60 | * required the same attribute CANNOT be set as optional and vice | |
61 | * versa. | |
62 | */ | |
63 | unsigned long optattrs; | |
64 | ||
d1df6fd8 DL |
65 | int (*input)(struct sk_buff *skb, struct seg6_local_lwt *slwt); |
66 | int static_headroom; | |
cfdf64a0 AM |
67 | |
68 | struct seg6_local_lwtunnel_ops slwt_ops; | |
d1df6fd8 DL |
69 | }; |
70 | ||
004d4b27 MX |
71 | struct bpf_lwt_prog { |
72 | struct bpf_prog *prog; | |
73 | char *name; | |
74 | }; | |
75 | ||
848f3c0d AM |
76 | /* default length values (expressed in bits) for both Locator-Block and |
77 | * Locator-Node Function. | |
78 | * | |
79 | * Both SEG6_LOCAL_LCBLOCK_DBITS and SEG6_LOCAL_LCNODE_FN_DBITS *must* be: | |
80 | * i) greater than 0; | |
81 | * ii) evenly divisible by 8. In other terms, the lengths of the | |
82 | * Locator-Block and Locator-Node Function must be byte-aligned (we can | |
83 | * relax this constraint in the future if really needed). | |
84 | * | |
85 | * Moreover, a third condition must hold: | |
86 | * iii) SEG6_LOCAL_LCBLOCK_DBITS + SEG6_LOCAL_LCNODE_FN_DBITS <= 128. | |
87 | * | |
88 | * The correctness of SEG6_LOCAL_LCBLOCK_DBITS and SEG6_LOCAL_LCNODE_FN_DBITS | |
89 | * values are checked during the kernel compilation. If the compilation stops, | |
90 | * check the value of these parameters to see if they meet conditions (i), (ii) | |
91 | * and (iii). | |
92 | */ | |
93 | #define SEG6_LOCAL_LCBLOCK_DBITS 32 | |
94 | #define SEG6_LOCAL_LCNODE_FN_DBITS 16 | |
95 | ||
96 | /* The following next_csid_chk_{cntr,lcblock,lcblock_fn}_bits macros can be | |
97 | * used directly to check whether the lengths (in bits) of Locator-Block and | |
98 | * Locator-Node Function are valid according to (i), (ii), (iii). | |
99 | */ | |
100 | #define next_csid_chk_cntr_bits(blen, flen) \ | |
101 | ((blen) + (flen) > 128) | |
102 | ||
103 | #define next_csid_chk_lcblock_bits(blen) \ | |
104 | ({ \ | |
105 | typeof(blen) __tmp = blen; \ | |
106 | (!__tmp || __tmp > 120 || (__tmp & 0x07)); \ | |
107 | }) | |
108 | ||
109 | #define next_csid_chk_lcnode_fn_bits(flen) \ | |
110 | next_csid_chk_lcblock_bits(flen) | |
111 | ||
7458575a AM |
112 | /* flag indicating that flavors are set up for a given End* behavior */ |
113 | #define SEG6_F_LOCAL_FLAVORS SEG6_F_ATTR(SEG6_LOCAL_FLAVORS) | |
114 | ||
bdf3c0b9 | 115 | #define SEG6_F_LOCAL_FLV_OP(flvname) BIT(SEG6_LOCAL_FLV_OP_##flvname) |
7458575a | 116 | #define SEG6_F_LOCAL_FLV_NEXT_CSID SEG6_F_LOCAL_FLV_OP(NEXT_CSID) |
bdf3c0b9 AM |
117 | #define SEG6_F_LOCAL_FLV_PSP SEG6_F_LOCAL_FLV_OP(PSP) |
118 | ||
119 | /* Supported RFC8986 Flavor operations are reported in this bitmask */ | |
120 | #define SEG6_LOCAL_FLV8986_SUPP_OPS SEG6_F_LOCAL_FLV_PSP | |
121 | ||
7458575a | 122 | #define SEG6_LOCAL_END_FLV_SUPP_OPS (SEG6_F_LOCAL_FLV_NEXT_CSID | \ |
bdf3c0b9 | 123 | SEG6_LOCAL_FLV8986_SUPP_OPS) |
7458575a | 124 | #define SEG6_LOCAL_END_X_FLV_SUPP_OPS SEG6_F_LOCAL_FLV_NEXT_CSID |
848f3c0d AM |
125 | |
126 | struct seg6_flavors_info { | |
127 | /* Flavor operations */ | |
128 | __u32 flv_ops; | |
129 | ||
130 | /* Locator-Block length, expressed in bits */ | |
131 | __u8 lcblock_bits; | |
132 | /* Locator-Node Function length, expressed in bits*/ | |
133 | __u8 lcnode_func_bits; | |
134 | }; | |
135 | ||
664d6f86 AM |
136 | enum seg6_end_dt_mode { |
137 | DT_INVALID_MODE = -EINVAL, | |
138 | DT_LEGACY_MODE = 0, | |
139 | DT_VRF_MODE = 1, | |
140 | }; | |
141 | ||
142 | struct seg6_end_dt_info { | |
143 | enum seg6_end_dt_mode mode; | |
144 | ||
145 | struct net *net; | |
146 | /* VRF device associated to the routing table used by the SRv6 | |
147 | * End.DT4/DT6 behavior for routing IPv4/IPv6 packets. | |
148 | */ | |
149 | int vrf_ifindex; | |
150 | int vrf_table; | |
151 | ||
8b532109 AM |
152 | /* tunneled packet family (IPv4 or IPv6). |
153 | * Protocol and header length are inferred from family. | |
154 | */ | |
664d6f86 | 155 | u16 family; |
664d6f86 AM |
156 | }; |
157 | ||
94604548 AM |
158 | struct pcpu_seg6_local_counters { |
159 | u64_stats_t packets; | |
160 | u64_stats_t bytes; | |
161 | u64_stats_t errors; | |
162 | ||
163 | struct u64_stats_sync syncp; | |
164 | }; | |
165 | ||
166 | /* This struct groups all the SRv6 Behavior counters supported so far. | |
167 | * | |
168 | * put_nla_counters() makes use of this data structure to collect all counter | |
169 | * values after the per-CPU counter evaluation has been performed. | |
170 | * Finally, each counter value (in seg6_local_counters) is stored in the | |
171 | * corresponding netlink attribute and sent to user space. | |
172 | * | |
173 | * NB: we don't want to expose this structure to user space! | |
174 | */ | |
175 | struct seg6_local_counters { | |
176 | __u64 packets; | |
177 | __u64 bytes; | |
178 | __u64 errors; | |
179 | }; | |
180 | ||
181 | #define seg6_local_alloc_pcpu_counters(__gfp) \ | |
182 | __netdev_alloc_pcpu_stats(struct pcpu_seg6_local_counters, \ | |
183 | ((__gfp) | __GFP_ZERO)) | |
184 | ||
185 | #define SEG6_F_LOCAL_COUNTERS SEG6_F_ATTR(SEG6_LOCAL_COUNTERS) | |
186 | ||
d1df6fd8 DL |
187 | struct seg6_local_lwt { |
188 | int action; | |
189 | struct ipv6_sr_hdr *srh; | |
190 | int table; | |
191 | struct in_addr nh4; | |
192 | struct in6_addr nh6; | |
193 | int iif; | |
194 | int oif; | |
004d4b27 | 195 | struct bpf_lwt_prog bpf; |
664d6f86 AM |
196 | #ifdef CONFIG_NET_L3_MASTER_DEV |
197 | struct seg6_end_dt_info dt_info; | |
198 | #endif | |
848f3c0d AM |
199 | struct seg6_flavors_info flv_info; |
200 | ||
94604548 | 201 | struct pcpu_seg6_local_counters __percpu *pcpu_counters; |
d1df6fd8 DL |
202 | |
203 | int headroom; | |
204 | struct seg6_action_desc *desc; | |
0a3021f1 AM |
205 | /* unlike the required attrs, we have to track the optional attributes |
206 | * that have been effectively parsed. | |
207 | */ | |
208 | unsigned long parsed_optattrs; | |
d1df6fd8 DL |
209 | }; |
210 | ||
211 | static struct seg6_local_lwt *seg6_local_lwtunnel(struct lwtunnel_state *lwt) | |
212 | { | |
213 | return (struct seg6_local_lwt *)lwt->data; | |
214 | } | |
215 | ||
140f04c3 DL |
216 | static struct ipv6_sr_hdr *get_and_validate_srh(struct sk_buff *skb) |
217 | { | |
218 | struct ipv6_sr_hdr *srh; | |
219 | ||
fa55a7d7 | 220 | srh = seg6_get_srh(skb, IP6_FH_F_SKIP_RH); |
140f04c3 DL |
221 | if (!srh) |
222 | return NULL; | |
223 | ||
140f04c3 DL |
224 | #ifdef CONFIG_IPV6_SEG6_HMAC |
225 | if (!seg6_hmac_validate_skb(skb)) | |
226 | return NULL; | |
227 | #endif | |
228 | ||
229 | return srh; | |
230 | } | |
231 | ||
d7a669dd DL |
232 | static bool decap_and_validate(struct sk_buff *skb, int proto) |
233 | { | |
234 | struct ipv6_sr_hdr *srh; | |
235 | unsigned int off = 0; | |
236 | ||
fa55a7d7 | 237 | srh = seg6_get_srh(skb, 0); |
d7a669dd DL |
238 | if (srh && srh->segments_left > 0) |
239 | return false; | |
240 | ||
241 | #ifdef CONFIG_IPV6_SEG6_HMAC | |
242 | if (srh && !seg6_hmac_validate_skb(skb)) | |
243 | return false; | |
244 | #endif | |
245 | ||
246 | if (ipv6_find_hdr(skb, &off, proto, NULL, NULL) < 0) | |
247 | return false; | |
248 | ||
249 | if (!pskb_pull(skb, off)) | |
250 | return false; | |
251 | ||
252 | skb_postpull_rcsum(skb, skb_network_header(skb), off); | |
253 | ||
254 | skb_reset_network_header(skb); | |
255 | skb_reset_transport_header(skb); | |
62ebaeae YT |
256 | if (iptunnel_pull_offloads(skb)) |
257 | return false; | |
d7a669dd DL |
258 | |
259 | return true; | |
260 | } | |
261 | ||
262 | static void advance_nextseg(struct ipv6_sr_hdr *srh, struct in6_addr *daddr) | |
263 | { | |
264 | struct in6_addr *addr; | |
265 | ||
266 | srh->segments_left--; | |
267 | addr = srh->segments + srh->segments_left; | |
268 | *daddr = *addr; | |
269 | } | |
270 | ||
fd1fef0c AM |
271 | static int |
272 | seg6_lookup_any_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr, | |
273 | u32 tbl_id, bool local_delivery) | |
d7a669dd DL |
274 | { |
275 | struct net *net = dev_net(skb->dev); | |
276 | struct ipv6hdr *hdr = ipv6_hdr(skb); | |
277 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
278 | struct dst_entry *dst = NULL; | |
279 | struct rt6_info *rt; | |
280 | struct flowi6 fl6; | |
fd1fef0c | 281 | int dev_flags = 0; |
d7a669dd | 282 | |
a3bd2102 | 283 | memset(&fl6, 0, sizeof(fl6)); |
d7a669dd DL |
284 | fl6.flowi6_iif = skb->dev->ifindex; |
285 | fl6.daddr = nhaddr ? *nhaddr : hdr->daddr; | |
286 | fl6.saddr = hdr->saddr; | |
287 | fl6.flowlabel = ip6_flowinfo(hdr); | |
288 | fl6.flowi6_mark = skb->mark; | |
289 | fl6.flowi6_proto = hdr->nexthdr; | |
290 | ||
291 | if (nhaddr) | |
292 | fl6.flowi6_flags = FLOWI_FLAG_KNOWN_NH; | |
293 | ||
294 | if (!tbl_id) { | |
b75cc8f9 | 295 | dst = ip6_route_input_lookup(net, skb->dev, &fl6, skb, flags); |
d7a669dd DL |
296 | } else { |
297 | struct fib6_table *table; | |
298 | ||
299 | table = fib6_get_table(net, tbl_id); | |
300 | if (!table) | |
301 | goto out; | |
302 | ||
b75cc8f9 | 303 | rt = ip6_pol_route(net, table, 0, &fl6, skb, flags); |
d7a669dd DL |
304 | dst = &rt->dst; |
305 | } | |
306 | ||
fd1fef0c AM |
307 | /* we want to discard traffic destined for local packet processing, |
308 | * if @local_delivery is set to false. | |
309 | */ | |
310 | if (!local_delivery) | |
311 | dev_flags |= IFF_LOOPBACK; | |
312 | ||
313 | if (dst && (dst->dev->flags & dev_flags) && !dst->error) { | |
d7a669dd DL |
314 | dst_release(dst); |
315 | dst = NULL; | |
316 | } | |
317 | ||
318 | out: | |
319 | if (!dst) { | |
320 | rt = net->ipv6.ip6_blk_hole_entry; | |
321 | dst = &rt->dst; | |
322 | dst_hold(dst); | |
323 | } | |
324 | ||
325 | skb_dst_drop(skb); | |
326 | skb_dst_set(skb, dst); | |
1c1e761e | 327 | return dst->error; |
d7a669dd DL |
328 | } |
329 | ||
fd1fef0c AM |
330 | int seg6_lookup_nexthop(struct sk_buff *skb, |
331 | struct in6_addr *nhaddr, u32 tbl_id) | |
332 | { | |
333 | return seg6_lookup_any_nexthop(skb, nhaddr, tbl_id, false); | |
334 | } | |
335 | ||
848f3c0d AM |
336 | static __u8 seg6_flv_lcblock_octects(const struct seg6_flavors_info *finfo) |
337 | { | |
338 | return finfo->lcblock_bits >> 3; | |
339 | } | |
340 | ||
341 | static __u8 seg6_flv_lcnode_func_octects(const struct seg6_flavors_info *finfo) | |
342 | { | |
343 | return finfo->lcnode_func_bits >> 3; | |
344 | } | |
345 | ||
346 | static bool seg6_next_csid_is_arg_zero(const struct in6_addr *addr, | |
347 | const struct seg6_flavors_info *finfo) | |
348 | { | |
349 | __u8 fnc_octects = seg6_flv_lcnode_func_octects(finfo); | |
350 | __u8 blk_octects = seg6_flv_lcblock_octects(finfo); | |
351 | __u8 arg_octects; | |
352 | int i; | |
353 | ||
354 | arg_octects = 16 - blk_octects - fnc_octects; | |
355 | for (i = 0; i < arg_octects; ++i) { | |
356 | if (addr->s6_addr[blk_octects + fnc_octects + i] != 0x00) | |
357 | return false; | |
358 | } | |
359 | ||
360 | return true; | |
361 | } | |
362 | ||
363 | /* assume that DA.Argument length > 0 */ | |
364 | static void seg6_next_csid_advance_arg(struct in6_addr *addr, | |
365 | const struct seg6_flavors_info *finfo) | |
366 | { | |
367 | __u8 fnc_octects = seg6_flv_lcnode_func_octects(finfo); | |
368 | __u8 blk_octects = seg6_flv_lcblock_octects(finfo); | |
369 | ||
370 | /* advance DA.Argument */ | |
371 | memmove(&addr->s6_addr[blk_octects], | |
372 | &addr->s6_addr[blk_octects + fnc_octects], | |
373 | 16 - blk_octects - fnc_octects); | |
374 | ||
375 | memset(&addr->s6_addr[16 - fnc_octects], 0x00, fnc_octects); | |
376 | } | |
377 | ||
525c65ff AM |
378 | static int input_action_end_finish(struct sk_buff *skb, |
379 | struct seg6_local_lwt *slwt) | |
380 | { | |
381 | seg6_lookup_nexthop(skb, NULL, 0); | |
382 | ||
383 | return dst_input(skb); | |
384 | } | |
385 | ||
848f3c0d AM |
386 | static int input_action_end_core(struct sk_buff *skb, |
387 | struct seg6_local_lwt *slwt) | |
140f04c3 DL |
388 | { |
389 | struct ipv6_sr_hdr *srh; | |
140f04c3 DL |
390 | |
391 | srh = get_and_validate_srh(skb); | |
392 | if (!srh) | |
393 | goto drop; | |
394 | ||
d7a669dd | 395 | advance_nextseg(srh, &ipv6_hdr(skb)->daddr); |
140f04c3 | 396 | |
525c65ff | 397 | return input_action_end_finish(skb, slwt); |
140f04c3 DL |
398 | |
399 | drop: | |
400 | kfree_skb(skb); | |
401 | return -EINVAL; | |
402 | } | |
403 | ||
848f3c0d AM |
404 | static int end_next_csid_core(struct sk_buff *skb, struct seg6_local_lwt *slwt) |
405 | { | |
406 | const struct seg6_flavors_info *finfo = &slwt->flv_info; | |
407 | struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
408 | ||
409 | if (seg6_next_csid_is_arg_zero(daddr, finfo)) | |
410 | return input_action_end_core(skb, slwt); | |
411 | ||
412 | /* update DA */ | |
413 | seg6_next_csid_advance_arg(daddr, finfo); | |
414 | ||
525c65ff | 415 | return input_action_end_finish(skb, slwt); |
848f3c0d AM |
416 | } |
417 | ||
7458575a AM |
418 | static int input_action_end_x_finish(struct sk_buff *skb, |
419 | struct seg6_local_lwt *slwt) | |
420 | { | |
421 | seg6_lookup_nexthop(skb, &slwt->nh6, 0); | |
422 | ||
423 | return dst_input(skb); | |
424 | } | |
425 | ||
426 | static int input_action_end_x_core(struct sk_buff *skb, | |
427 | struct seg6_local_lwt *slwt) | |
428 | { | |
429 | struct ipv6_sr_hdr *srh; | |
430 | ||
431 | srh = get_and_validate_srh(skb); | |
432 | if (!srh) | |
433 | goto drop; | |
434 | ||
435 | advance_nextseg(srh, &ipv6_hdr(skb)->daddr); | |
436 | ||
437 | return input_action_end_x_finish(skb, slwt); | |
438 | ||
439 | drop: | |
440 | kfree_skb(skb); | |
441 | return -EINVAL; | |
442 | } | |
443 | ||
444 | static int end_x_next_csid_core(struct sk_buff *skb, | |
445 | struct seg6_local_lwt *slwt) | |
446 | { | |
447 | const struct seg6_flavors_info *finfo = &slwt->flv_info; | |
448 | struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
449 | ||
450 | if (seg6_next_csid_is_arg_zero(daddr, finfo)) | |
451 | return input_action_end_x_core(skb, slwt); | |
452 | ||
453 | /* update DA */ | |
454 | seg6_next_csid_advance_arg(daddr, finfo); | |
455 | ||
456 | return input_action_end_x_finish(skb, slwt); | |
457 | } | |
458 | ||
848f3c0d AM |
459 | static bool seg6_next_csid_enabled(__u32 fops) |
460 | { | |
7458575a AM |
461 | return fops & SEG6_F_LOCAL_FLV_NEXT_CSID; |
462 | } | |
463 | ||
464 | /* Processing of SRv6 End, End.X, and End.T behaviors can be extended through | |
465 | * the flavors framework. These behaviors must report the subset of (flavor) | |
466 | * operations they currently implement. In this way, if a user specifies a | |
467 | * flavor combination that is not supported by a given End* behavior, the | |
468 | * kernel refuses to instantiate the tunnel reporting the error. | |
469 | */ | |
470 | static int seg6_flv_supp_ops_by_action(int action, __u32 *fops) | |
471 | { | |
472 | switch (action) { | |
473 | case SEG6_LOCAL_ACTION_END: | |
474 | *fops = SEG6_LOCAL_END_FLV_SUPP_OPS; | |
475 | break; | |
476 | case SEG6_LOCAL_ACTION_END_X: | |
477 | *fops = SEG6_LOCAL_END_X_FLV_SUPP_OPS; | |
478 | break; | |
479 | default: | |
480 | return -EOPNOTSUPP; | |
481 | } | |
482 | ||
483 | return 0; | |
848f3c0d AM |
484 | } |
485 | ||
bdf3c0b9 AM |
486 | /* We describe the packet state in relation to the absence/presence of the SRH |
487 | * and the Segment Left (SL) field. | |
488 | * For our purposes, it is not necessary to record the exact value of the SL | |
489 | * when the SID List consists of two or more segments. | |
490 | */ | |
491 | enum seg6_local_pktinfo { | |
492 | /* the order really matters! */ | |
493 | SEG6_LOCAL_PKTINFO_NOHDR = 0, | |
494 | SEG6_LOCAL_PKTINFO_SL_ZERO, | |
495 | SEG6_LOCAL_PKTINFO_SL_ONE, | |
496 | SEG6_LOCAL_PKTINFO_SL_MORE, | |
497 | __SEG6_LOCAL_PKTINFO_MAX, | |
498 | }; | |
499 | ||
500 | #define SEG6_LOCAL_PKTINFO_MAX (__SEG6_LOCAL_PKTINFO_MAX - 1) | |
501 | ||
502 | static enum seg6_local_pktinfo seg6_get_srh_pktinfo(struct ipv6_sr_hdr *srh) | |
503 | { | |
504 | __u8 sgl; | |
505 | ||
506 | if (!srh) | |
507 | return SEG6_LOCAL_PKTINFO_NOHDR; | |
508 | ||
509 | sgl = srh->segments_left; | |
510 | if (sgl < 2) | |
511 | return SEG6_LOCAL_PKTINFO_SL_ZERO + sgl; | |
512 | ||
513 | return SEG6_LOCAL_PKTINFO_SL_MORE; | |
514 | } | |
515 | ||
516 | enum seg6_local_flv_action { | |
517 | SEG6_LOCAL_FLV_ACT_UNSPEC = 0, | |
518 | SEG6_LOCAL_FLV_ACT_END, | |
519 | SEG6_LOCAL_FLV_ACT_PSP, | |
520 | SEG6_LOCAL_FLV_ACT_USP, | |
521 | SEG6_LOCAL_FLV_ACT_USD, | |
522 | __SEG6_LOCAL_FLV_ACT_MAX | |
523 | }; | |
524 | ||
525 | #define SEG6_LOCAL_FLV_ACT_MAX (__SEG6_LOCAL_FLV_ACT_MAX - 1) | |
526 | ||
527 | /* The action table for RFC8986 flavors (see the flv8986_act_tbl below) | |
528 | * contains the actions (i.e. processing operations) to be applied on packets | |
529 | * when flavors are configured for an End* behavior. | |
530 | * By combining the pkinfo data and from the flavors mask, the macro | |
531 | * computes the index used to access the elements (actions) stored in the | |
532 | * action table. The index is structured as follows: | |
533 | * | |
534 | * index | |
535 | * _______________/\________________ | |
536 | * / \ | |
537 | * +----------------+----------------+ | |
538 | * | pf | afm | | |
539 | * +----------------+----------------+ | |
540 | * ph-1 ... p1 p0 fk-1 ... f1 f0 | |
541 | * MSB LSB | |
542 | * | |
543 | * where: | |
544 | * - 'afm' (adjusted flavor mask) is the mask containing a combination of the | |
545 | * RFC8986 flavors currently supported. 'afm' corresponds to the @fm | |
546 | * argument of the macro whose value is righ-shifted by 1 bit. By doing so, | |
547 | * we discard the SEG6_LOCAL_FLV_OP_UNSPEC flag (bit 0 in @fm) which is | |
548 | * never used here; | |
549 | * - 'pf' encodes the packet info (pktinfo) regarding the presence/absence of | |
550 | * the SRH, SL = 0, etc. 'pf' is set with the value of @pf provided as | |
551 | * argument to the macro. | |
552 | */ | |
553 | #define flv8986_act_tbl_idx(pf, fm) \ | |
554 | ((((pf) << bits_per(SEG6_LOCAL_FLV8986_SUPP_OPS)) | \ | |
555 | ((fm) & SEG6_LOCAL_FLV8986_SUPP_OPS)) >> SEG6_LOCAL_FLV_OP_PSP) | |
556 | ||
557 | /* We compute the size of the action table by considering the RFC8986 flavors | |
558 | * actually supported by the kernel. In this way, the size is automatically | |
559 | * adjusted when new flavors are supported. | |
560 | */ | |
561 | #define FLV8986_ACT_TBL_SIZE \ | |
562 | roundup_pow_of_two(flv8986_act_tbl_idx(SEG6_LOCAL_PKTINFO_MAX, \ | |
563 | SEG6_LOCAL_FLV8986_SUPP_OPS)) | |
564 | ||
565 | /* tbl_cfg(act, pf, fm) macro is used to easily configure the action | |
566 | * table; it accepts 3 arguments: | |
567 | * i) @act, the suffix from SEG6_LOCAL_FLV_ACT_{act} representing | |
568 | * the action that should be applied on the packet; | |
569 | * ii) @pf, the suffix from SEG6_LOCAL_PKTINFO_{pf} reporting the packet | |
570 | * info about the lack/presence of SRH, SRH with SL = 0, etc; | |
571 | * iii) @fm, the mask of flavors. | |
572 | */ | |
573 | #define tbl_cfg(act, pf, fm) \ | |
574 | [flv8986_act_tbl_idx(SEG6_LOCAL_PKTINFO_##pf, \ | |
575 | (fm))] = SEG6_LOCAL_FLV_ACT_##act | |
576 | ||
577 | /* shorthand for improving readability */ | |
578 | #define F_PSP SEG6_F_LOCAL_FLV_PSP | |
579 | ||
580 | /* The table contains, for each combination of the pktinfo data and | |
581 | * flavors, the action that should be taken on a packet (e.g. | |
582 | * "standard" Endpoint processing, Penultimate Segment Pop, etc). | |
583 | * | |
584 | * By default, table entries not explicitly configured are initialized with the | |
585 | * SEG6_LOCAL_FLV_ACT_UNSPEC action, which generally has the effect of | |
586 | * discarding the processed packet. | |
587 | */ | |
588 | static const u8 flv8986_act_tbl[FLV8986_ACT_TBL_SIZE] = { | |
589 | /* PSP variant for packet where SRH with SL = 1 */ | |
590 | tbl_cfg(PSP, SL_ONE, F_PSP), | |
591 | /* End for packet where the SRH with SL > 1*/ | |
592 | tbl_cfg(END, SL_MORE, F_PSP), | |
593 | }; | |
594 | ||
595 | #undef F_PSP | |
596 | #undef tbl_cfg | |
597 | ||
598 | /* For each flavor defined in RFC8986 (or a combination of them) an action is | |
599 | * performed on the packet. The specific action depends on: | |
600 | * - info extracted from the packet (i.e. pktinfo data) regarding the | |
601 | * lack/presence of the SRH, and if the SRH is available, on the value of | |
602 | * Segment Left field; | |
603 | * - the mask of flavors configured for the specific SRv6 End* behavior. | |
604 | * | |
605 | * The function combines both the pkinfo and the flavors mask to evaluate the | |
606 | * corresponding action to be taken on the packet. | |
607 | */ | |
608 | static enum seg6_local_flv_action | |
609 | seg6_local_flv8986_act_lookup(enum seg6_local_pktinfo pinfo, __u32 flvmask) | |
610 | { | |
611 | unsigned long index; | |
612 | ||
613 | /* check if the provided mask of flavors is supported */ | |
614 | if (unlikely(flvmask & ~SEG6_LOCAL_FLV8986_SUPP_OPS)) | |
615 | return SEG6_LOCAL_FLV_ACT_UNSPEC; | |
616 | ||
617 | index = flv8986_act_tbl_idx(pinfo, flvmask); | |
618 | if (unlikely(index >= FLV8986_ACT_TBL_SIZE)) | |
619 | return SEG6_LOCAL_FLV_ACT_UNSPEC; | |
620 | ||
621 | return flv8986_act_tbl[index]; | |
622 | } | |
623 | ||
624 | /* skb->data must be aligned with skb->network_header */ | |
625 | static bool seg6_pop_srh(struct sk_buff *skb, int srhoff) | |
626 | { | |
627 | struct ipv6_sr_hdr *srh; | |
628 | struct ipv6hdr *iph; | |
629 | __u8 srh_nexthdr; | |
630 | int thoff = -1; | |
631 | int srhlen; | |
632 | int nhlen; | |
633 | ||
634 | if (unlikely(srhoff < sizeof(*iph) || | |
635 | !pskb_may_pull(skb, srhoff + sizeof(*srh)))) | |
636 | return false; | |
637 | ||
638 | srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); | |
639 | srhlen = ipv6_optlen(srh); | |
640 | ||
641 | /* we are about to mangle the pkt, let's check if we can write on it */ | |
642 | if (unlikely(skb_ensure_writable(skb, srhoff + srhlen))) | |
643 | return false; | |
644 | ||
645 | /* skb_ensure_writable() may change skb pointers; evaluate srh again */ | |
646 | srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); | |
647 | srh_nexthdr = srh->nexthdr; | |
648 | ||
649 | if (unlikely(!skb_transport_header_was_set(skb))) | |
650 | goto pull; | |
651 | ||
652 | nhlen = skb_network_header_len(skb); | |
653 | /* we have to deal with the transport header: it could be set before | |
654 | * the SRH, after the SRH, or within it (which is considered wrong, | |
655 | * however). | |
656 | */ | |
657 | if (likely(nhlen <= srhoff)) | |
658 | thoff = nhlen; | |
659 | else if (nhlen >= srhoff + srhlen) | |
660 | /* transport_header is set after the SRH */ | |
661 | thoff = nhlen - srhlen; | |
662 | else | |
663 | /* transport_header falls inside the SRH; hence, we can't | |
664 | * restore the transport_header pointer properly after | |
665 | * SRH removing operation. | |
666 | */ | |
667 | return false; | |
668 | pull: | |
669 | /* we need to pop the SRH: | |
670 | * 1) first of all, we pull out everything from IPv6 header up to SRH | |
671 | * (included) evaluating also the rcsum; | |
672 | * 2) we overwrite (and then remove) the SRH by properly moving the | |
673 | * IPv6 along with any extension header that precedes the SRH; | |
674 | * 3) At the end, we push back the pulled headers (except for SRH, | |
675 | * obviously). | |
676 | */ | |
677 | skb_pull_rcsum(skb, srhoff + srhlen); | |
678 | memmove(skb_network_header(skb) + srhlen, skb_network_header(skb), | |
679 | srhoff); | |
680 | skb_push(skb, srhoff); | |
681 | ||
682 | skb_reset_network_header(skb); | |
683 | skb_mac_header_rebuild(skb); | |
684 | if (likely(thoff >= 0)) | |
685 | skb_set_transport_header(skb, thoff); | |
686 | ||
687 | iph = ipv6_hdr(skb); | |
688 | if (iph->nexthdr == NEXTHDR_ROUTING) { | |
689 | iph->nexthdr = srh_nexthdr; | |
690 | } else { | |
691 | /* we must look for the extension header (EXTH, for short) that | |
692 | * immediately precedes the SRH we have just removed. | |
693 | * Then, we update the value of the EXTH nexthdr with the one | |
694 | * contained in the SRH nexthdr. | |
695 | */ | |
696 | unsigned int off = sizeof(*iph); | |
697 | struct ipv6_opt_hdr *hp, _hdr; | |
698 | __u8 nexthdr = iph->nexthdr; | |
699 | ||
700 | for (;;) { | |
701 | if (unlikely(!ipv6_ext_hdr(nexthdr) || | |
702 | nexthdr == NEXTHDR_NONE)) | |
703 | return false; | |
704 | ||
705 | hp = skb_header_pointer(skb, off, sizeof(_hdr), &_hdr); | |
706 | if (unlikely(!hp)) | |
707 | return false; | |
708 | ||
709 | if (hp->nexthdr == NEXTHDR_ROUTING) { | |
710 | hp->nexthdr = srh_nexthdr; | |
711 | break; | |
712 | } | |
713 | ||
714 | switch (nexthdr) { | |
715 | case NEXTHDR_FRAGMENT: | |
716 | fallthrough; | |
717 | case NEXTHDR_AUTH: | |
718 | /* we expect SRH before FRAG and AUTH */ | |
719 | return false; | |
720 | default: | |
721 | off += ipv6_optlen(hp); | |
722 | break; | |
723 | } | |
724 | ||
725 | nexthdr = hp->nexthdr; | |
726 | } | |
727 | } | |
728 | ||
729 | iph->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); | |
730 | ||
731 | skb_postpush_rcsum(skb, iph, srhoff); | |
732 | ||
733 | return true; | |
734 | } | |
735 | ||
736 | /* process the packet on the basis of the RFC8986 flavors set for the given | |
737 | * SRv6 End behavior instance. | |
738 | */ | |
739 | static int end_flv8986_core(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
740 | { | |
741 | const struct seg6_flavors_info *finfo = &slwt->flv_info; | |
742 | enum seg6_local_flv_action action; | |
743 | enum seg6_local_pktinfo pinfo; | |
744 | struct ipv6_sr_hdr *srh; | |
745 | __u32 flvmask; | |
746 | int srhoff; | |
747 | ||
748 | srh = seg6_get_srh(skb, 0); | |
749 | srhoff = srh ? ((unsigned char *)srh - skb->data) : 0; | |
750 | pinfo = seg6_get_srh_pktinfo(srh); | |
751 | #ifdef CONFIG_IPV6_SEG6_HMAC | |
752 | if (srh && !seg6_hmac_validate_skb(skb)) | |
753 | goto drop; | |
754 | #endif | |
755 | flvmask = finfo->flv_ops; | |
756 | if (unlikely(flvmask & ~SEG6_LOCAL_FLV8986_SUPP_OPS)) { | |
757 | pr_warn_once("seg6local: invalid RFC8986 flavors\n"); | |
758 | goto drop; | |
759 | } | |
760 | ||
761 | /* retrieve the action triggered by the combination of pktinfo data and | |
762 | * the flavors mask. | |
763 | */ | |
764 | action = seg6_local_flv8986_act_lookup(pinfo, flvmask); | |
765 | switch (action) { | |
766 | case SEG6_LOCAL_FLV_ACT_END: | |
767 | /* process the packet as the "standard" End behavior */ | |
768 | advance_nextseg(srh, &ipv6_hdr(skb)->daddr); | |
769 | break; | |
770 | case SEG6_LOCAL_FLV_ACT_PSP: | |
771 | advance_nextseg(srh, &ipv6_hdr(skb)->daddr); | |
772 | ||
773 | if (unlikely(!seg6_pop_srh(skb, srhoff))) | |
774 | goto drop; | |
775 | break; | |
776 | case SEG6_LOCAL_FLV_ACT_UNSPEC: | |
777 | fallthrough; | |
778 | default: | |
779 | /* by default, we drop the packet since we could not find a | |
780 | * suitable action. | |
781 | */ | |
782 | goto drop; | |
783 | } | |
784 | ||
785 | return input_action_end_finish(skb, slwt); | |
786 | ||
787 | drop: | |
788 | kfree_skb(skb); | |
789 | return -EINVAL; | |
790 | } | |
791 | ||
848f3c0d AM |
792 | /* regular endpoint function */ |
793 | static int input_action_end(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
794 | { | |
795 | const struct seg6_flavors_info *finfo = &slwt->flv_info; | |
bdf3c0b9 | 796 | __u32 fops = finfo->flv_ops; |
848f3c0d | 797 | |
bdf3c0b9 AM |
798 | if (!fops) |
799 | return input_action_end_core(skb, slwt); | |
800 | ||
801 | /* check for the presence of NEXT-C-SID since it applies first */ | |
802 | if (seg6_next_csid_enabled(fops)) | |
848f3c0d AM |
803 | return end_next_csid_core(skb, slwt); |
804 | ||
bdf3c0b9 AM |
805 | /* the specific processing function to be performed on the packet |
806 | * depends on the combination of flavors defined in RFC8986 and some | |
807 | * information extracted from the packet, e.g. presence/absence of SRH, | |
808 | * Segment Left = 0, etc. | |
809 | */ | |
810 | return end_flv8986_core(skb, slwt); | |
848f3c0d AM |
811 | } |
812 | ||
140f04c3 DL |
813 | /* regular endpoint, and forward to specified nexthop */ |
814 | static int input_action_end_x(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
815 | { | |
7458575a AM |
816 | const struct seg6_flavors_info *finfo = &slwt->flv_info; |
817 | __u32 fops = finfo->flv_ops; | |
140f04c3 | 818 | |
7458575a AM |
819 | /* check for the presence of NEXT-C-SID since it applies first */ |
820 | if (seg6_next_csid_enabled(fops)) | |
821 | return end_x_next_csid_core(skb, slwt); | |
140f04c3 | 822 | |
7458575a | 823 | return input_action_end_x_core(skb, slwt); |
140f04c3 DL |
824 | } |
825 | ||
891ef8dd DL |
826 | static int input_action_end_t(struct sk_buff *skb, struct seg6_local_lwt *slwt) |
827 | { | |
828 | struct ipv6_sr_hdr *srh; | |
829 | ||
830 | srh = get_and_validate_srh(skb); | |
831 | if (!srh) | |
832 | goto drop; | |
833 | ||
834 | advance_nextseg(srh, &ipv6_hdr(skb)->daddr); | |
835 | ||
1c1e761e | 836 | seg6_lookup_nexthop(skb, NULL, slwt->table); |
891ef8dd DL |
837 | |
838 | return dst_input(skb); | |
839 | ||
840 | drop: | |
841 | kfree_skb(skb); | |
842 | return -EINVAL; | |
843 | } | |
844 | ||
845 | /* decapsulate and forward inner L2 frame on specified interface */ | |
846 | static int input_action_end_dx2(struct sk_buff *skb, | |
847 | struct seg6_local_lwt *slwt) | |
848 | { | |
849 | struct net *net = dev_net(skb->dev); | |
850 | struct net_device *odev; | |
851 | struct ethhdr *eth; | |
852 | ||
26776253 | 853 | if (!decap_and_validate(skb, IPPROTO_ETHERNET)) |
891ef8dd DL |
854 | goto drop; |
855 | ||
856 | if (!pskb_may_pull(skb, ETH_HLEN)) | |
857 | goto drop; | |
858 | ||
859 | skb_reset_mac_header(skb); | |
860 | eth = (struct ethhdr *)skb->data; | |
861 | ||
862 | /* To determine the frame's protocol, we assume it is 802.3. This avoids | |
863 | * a call to eth_type_trans(), which is not really relevant for our | |
864 | * use case. | |
865 | */ | |
866 | if (!eth_proto_is_802_3(eth->h_proto)) | |
867 | goto drop; | |
868 | ||
869 | odev = dev_get_by_index_rcu(net, slwt->oif); | |
870 | if (!odev) | |
871 | goto drop; | |
872 | ||
873 | /* As we accept Ethernet frames, make sure the egress device is of | |
874 | * the correct type. | |
875 | */ | |
876 | if (odev->type != ARPHRD_ETHER) | |
877 | goto drop; | |
878 | ||
879 | if (!(odev->flags & IFF_UP) || !netif_carrier_ok(odev)) | |
880 | goto drop; | |
881 | ||
882 | skb_orphan(skb); | |
883 | ||
884 | if (skb_warn_if_lro(skb)) | |
885 | goto drop; | |
886 | ||
887 | skb_forward_csum(skb); | |
888 | ||
889 | if (skb->len - ETH_HLEN > odev->mtu) | |
890 | goto drop; | |
891 | ||
892 | skb->dev = odev; | |
893 | skb->protocol = eth->h_proto; | |
894 | ||
895 | return dev_queue_xmit(skb); | |
896 | ||
897 | drop: | |
898 | kfree_skb(skb); | |
899 | return -EINVAL; | |
900 | } | |
901 | ||
7a3f5b0d RS |
902 | static int input_action_end_dx6_finish(struct net *net, struct sock *sk, |
903 | struct sk_buff *skb) | |
904 | { | |
905 | struct dst_entry *orig_dst = skb_dst(skb); | |
906 | struct in6_addr *nhaddr = NULL; | |
907 | struct seg6_local_lwt *slwt; | |
908 | ||
909 | slwt = seg6_local_lwtunnel(orig_dst->lwtstate); | |
910 | ||
911 | /* The inner packet is not associated to any local interface, | |
912 | * so we do not call netif_rx(). | |
913 | * | |
914 | * If slwt->nh6 is set to ::, then lookup the nexthop for the | |
915 | * inner packet's DA. Otherwise, use the specified nexthop. | |
916 | */ | |
917 | if (!ipv6_addr_any(&slwt->nh6)) | |
918 | nhaddr = &slwt->nh6; | |
919 | ||
920 | seg6_lookup_nexthop(skb, nhaddr, 0); | |
921 | ||
922 | return dst_input(skb); | |
923 | } | |
924 | ||
140f04c3 DL |
925 | /* decapsulate and forward to specified nexthop */ |
926 | static int input_action_end_dx6(struct sk_buff *skb, | |
927 | struct seg6_local_lwt *slwt) | |
928 | { | |
140f04c3 DL |
929 | /* this function accepts IPv6 encapsulated packets, with either |
930 | * an SRH with SL=0, or no SRH. | |
931 | */ | |
932 | ||
d7a669dd | 933 | if (!decap_and_validate(skb, IPPROTO_IPV6)) |
140f04c3 | 934 | goto drop; |
140f04c3 | 935 | |
d7a669dd | 936 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
140f04c3 DL |
937 | goto drop; |
938 | ||
c71644d0 | 939 | skb_set_transport_header(skb, sizeof(struct ipv6hdr)); |
7a3f5b0d | 940 | nf_reset_ct(skb); |
c71644d0 | 941 | |
7a3f5b0d RS |
942 | if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled)) |
943 | return NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, | |
944 | dev_net(skb->dev), NULL, skb, NULL, | |
945 | skb_dst(skb)->dev, input_action_end_dx6_finish); | |
140f04c3 | 946 | |
7a3f5b0d | 947 | return input_action_end_dx6_finish(dev_net(skb->dev), NULL, skb); |
140f04c3 DL |
948 | drop: |
949 | kfree_skb(skb); | |
950 | return -EINVAL; | |
951 | } | |
952 | ||
7a3f5b0d RS |
953 | static int input_action_end_dx4_finish(struct net *net, struct sock *sk, |
954 | struct sk_buff *skb) | |
891ef8dd | 955 | { |
7a3f5b0d RS |
956 | struct dst_entry *orig_dst = skb_dst(skb); |
957 | struct seg6_local_lwt *slwt; | |
891ef8dd DL |
958 | struct iphdr *iph; |
959 | __be32 nhaddr; | |
960 | int err; | |
961 | ||
7a3f5b0d | 962 | slwt = seg6_local_lwtunnel(orig_dst->lwtstate); |
891ef8dd DL |
963 | |
964 | iph = ip_hdr(skb); | |
965 | ||
966 | nhaddr = slwt->nh4.s_addr ?: iph->daddr; | |
967 | ||
968 | skb_dst_drop(skb); | |
969 | ||
970 | err = ip_route_input(skb, nhaddr, iph->saddr, 0, skb->dev); | |
7a3f5b0d RS |
971 | if (err) { |
972 | kfree_skb(skb); | |
973 | return -EINVAL; | |
974 | } | |
891ef8dd DL |
975 | |
976 | return dst_input(skb); | |
7a3f5b0d RS |
977 | } |
978 | ||
979 | static int input_action_end_dx4(struct sk_buff *skb, | |
980 | struct seg6_local_lwt *slwt) | |
981 | { | |
982 | if (!decap_and_validate(skb, IPPROTO_IPIP)) | |
983 | goto drop; | |
984 | ||
985 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
986 | goto drop; | |
987 | ||
988 | skb->protocol = htons(ETH_P_IP); | |
989 | skb_set_transport_header(skb, sizeof(struct iphdr)); | |
990 | nf_reset_ct(skb); | |
991 | ||
992 | if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled)) | |
993 | return NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, | |
994 | dev_net(skb->dev), NULL, skb, NULL, | |
995 | skb_dst(skb)->dev, input_action_end_dx4_finish); | |
891ef8dd | 996 | |
7a3f5b0d | 997 | return input_action_end_dx4_finish(dev_net(skb->dev), NULL, skb); |
891ef8dd DL |
998 | drop: |
999 | kfree_skb(skb); | |
1000 | return -EINVAL; | |
1001 | } | |
1002 | ||
664d6f86 AM |
1003 | #ifdef CONFIG_NET_L3_MASTER_DEV |
1004 | static struct net *fib6_config_get_net(const struct fib6_config *fib6_cfg) | |
1005 | { | |
1006 | const struct nl_info *nli = &fib6_cfg->fc_nlinfo; | |
1007 | ||
1008 | return nli->nl_net; | |
1009 | } | |
1010 | ||
1011 | static int __seg6_end_dt_vrf_build(struct seg6_local_lwt *slwt, const void *cfg, | |
1012 | u16 family, struct netlink_ext_ack *extack) | |
1013 | { | |
1014 | struct seg6_end_dt_info *info = &slwt->dt_info; | |
1015 | int vrf_ifindex; | |
1016 | struct net *net; | |
1017 | ||
1018 | net = fib6_config_get_net(cfg); | |
1019 | ||
1020 | /* note that vrf_table was already set by parse_nla_vrftable() */ | |
1021 | vrf_ifindex = l3mdev_ifindex_lookup_by_table_id(L3MDEV_TYPE_VRF, net, | |
1022 | info->vrf_table); | |
1023 | if (vrf_ifindex < 0) { | |
1024 | if (vrf_ifindex == -EPERM) { | |
1025 | NL_SET_ERR_MSG(extack, | |
1026 | "Strict mode for VRF is disabled"); | |
1027 | } else if (vrf_ifindex == -ENODEV) { | |
1028 | NL_SET_ERR_MSG(extack, | |
1029 | "Table has no associated VRF device"); | |
1030 | } else { | |
1031 | pr_debug("seg6local: SRv6 End.DT* creation error=%d\n", | |
1032 | vrf_ifindex); | |
1033 | } | |
1034 | ||
1035 | return vrf_ifindex; | |
1036 | } | |
1037 | ||
1038 | info->net = net; | |
1039 | info->vrf_ifindex = vrf_ifindex; | |
1040 | ||
664d6f86 AM |
1041 | info->family = family; |
1042 | info->mode = DT_VRF_MODE; | |
1043 | ||
1044 | return 0; | |
1045 | } | |
1046 | ||
1047 | /* The SRv6 End.DT4/DT6 behavior extracts the inner (IPv4/IPv6) packet and | |
1048 | * routes the IPv4/IPv6 packet by looking at the configured routing table. | |
1049 | * | |
1050 | * In the SRv6 End.DT4/DT6 use case, we can receive traffic (IPv6+Segment | |
1051 | * Routing Header packets) from several interfaces and the outer IPv6 | |
1052 | * destination address (DA) is used for retrieving the specific instance of the | |
1053 | * End.DT4/DT6 behavior that should process the packets. | |
1054 | * | |
1055 | * However, the inner IPv4/IPv6 packet is not really bound to any receiving | |
1056 | * interface and thus the End.DT4/DT6 sets the VRF (associated with the | |
1057 | * corresponding routing table) as the *receiving* interface. | |
1058 | * In other words, the End.DT4/DT6 processes a packet as if it has been received | |
1059 | * directly by the VRF (and not by one of its slave devices, if any). | |
1060 | * In this way, the VRF interface is used for routing the IPv4/IPv6 packet in | |
1061 | * according to the routing table configured by the End.DT4/DT6 instance. | |
1062 | * | |
1063 | * This design allows you to get some interesting features like: | |
1064 | * 1) the statistics on rx packets; | |
1065 | * 2) the possibility to install a packet sniffer on the receiving interface | |
1066 | * (the VRF one) for looking at the incoming packets; | |
1067 | * 3) the possibility to leverage the netfilter prerouting hook for the inner | |
1068 | * IPv4 packet. | |
1069 | * | |
1070 | * This function returns: | |
1071 | * - the sk_buff* when the VRF rcv handler has processed the packet correctly; | |
1072 | * - NULL when the skb is consumed by the VRF rcv handler; | |
1073 | * - a pointer which encodes a negative error number in case of error. | |
1074 | * Note that in this case, the function takes care of freeing the skb. | |
1075 | */ | |
1076 | static struct sk_buff *end_dt_vrf_rcv(struct sk_buff *skb, u16 family, | |
1077 | struct net_device *dev) | |
1078 | { | |
1079 | /* based on l3mdev_ip_rcv; we are only interested in the master */ | |
1080 | if (unlikely(!netif_is_l3_master(dev) && !netif_has_l3_rx_handler(dev))) | |
1081 | goto drop; | |
1082 | ||
1083 | if (unlikely(!dev->l3mdev_ops->l3mdev_l3_rcv)) | |
1084 | goto drop; | |
1085 | ||
1086 | /* the decap packet IPv4/IPv6 does not come with any mac header info. | |
1087 | * We must unset the mac header to allow the VRF device to rebuild it, | |
1088 | * just in case there is a sniffer attached on the device. | |
1089 | */ | |
1090 | skb_unset_mac_header(skb); | |
1091 | ||
1092 | skb = dev->l3mdev_ops->l3mdev_l3_rcv(dev, skb, family); | |
1093 | if (!skb) | |
1094 | /* the skb buffer was consumed by the handler */ | |
1095 | return NULL; | |
1096 | ||
1097 | /* when a packet is received by a VRF or by one of its slaves, the | |
1098 | * master device reference is set into the skb. | |
1099 | */ | |
1100 | if (unlikely(skb->dev != dev || skb->skb_iif != dev->ifindex)) | |
1101 | goto drop; | |
1102 | ||
1103 | return skb; | |
1104 | ||
1105 | drop: | |
1106 | kfree_skb(skb); | |
1107 | return ERR_PTR(-EINVAL); | |
1108 | } | |
1109 | ||
1110 | static struct net_device *end_dt_get_vrf_rcu(struct sk_buff *skb, | |
1111 | struct seg6_end_dt_info *info) | |
1112 | { | |
1113 | int vrf_ifindex = info->vrf_ifindex; | |
1114 | struct net *net = info->net; | |
1115 | ||
1116 | if (unlikely(vrf_ifindex < 0)) | |
1117 | goto error; | |
1118 | ||
1119 | if (unlikely(!net_eq(dev_net(skb->dev), net))) | |
1120 | goto error; | |
1121 | ||
1122 | return dev_get_by_index_rcu(net, vrf_ifindex); | |
1123 | ||
1124 | error: | |
1125 | return NULL; | |
1126 | } | |
1127 | ||
1128 | static struct sk_buff *end_dt_vrf_core(struct sk_buff *skb, | |
8b532109 | 1129 | struct seg6_local_lwt *slwt, u16 family) |
664d6f86 AM |
1130 | { |
1131 | struct seg6_end_dt_info *info = &slwt->dt_info; | |
1132 | struct net_device *vrf; | |
8b532109 AM |
1133 | __be16 protocol; |
1134 | int hdrlen; | |
664d6f86 AM |
1135 | |
1136 | vrf = end_dt_get_vrf_rcu(skb, info); | |
1137 | if (unlikely(!vrf)) | |
1138 | goto drop; | |
1139 | ||
8b532109 AM |
1140 | switch (family) { |
1141 | case AF_INET: | |
1142 | protocol = htons(ETH_P_IP); | |
1143 | hdrlen = sizeof(struct iphdr); | |
1144 | break; | |
1145 | case AF_INET6: | |
1146 | protocol = htons(ETH_P_IPV6); | |
1147 | hdrlen = sizeof(struct ipv6hdr); | |
1148 | break; | |
1149 | case AF_UNSPEC: | |
1150 | fallthrough; | |
1151 | default: | |
1152 | goto drop; | |
1153 | } | |
1154 | ||
1155 | if (unlikely(info->family != AF_UNSPEC && info->family != family)) { | |
1156 | pr_warn_once("seg6local: SRv6 End.DT* family mismatch"); | |
1157 | goto drop; | |
1158 | } | |
1159 | ||
1160 | skb->protocol = protocol; | |
664d6f86 AM |
1161 | |
1162 | skb_dst_drop(skb); | |
1163 | ||
8b532109 | 1164 | skb_set_transport_header(skb, hdrlen); |
7a3f5b0d | 1165 | nf_reset_ct(skb); |
664d6f86 | 1166 | |
8b532109 | 1167 | return end_dt_vrf_rcv(skb, family, vrf); |
664d6f86 AM |
1168 | |
1169 | drop: | |
1170 | kfree_skb(skb); | |
1171 | return ERR_PTR(-EINVAL); | |
1172 | } | |
1173 | ||
1174 | static int input_action_end_dt4(struct sk_buff *skb, | |
1175 | struct seg6_local_lwt *slwt) | |
1176 | { | |
1177 | struct iphdr *iph; | |
1178 | int err; | |
1179 | ||
1180 | if (!decap_and_validate(skb, IPPROTO_IPIP)) | |
1181 | goto drop; | |
1182 | ||
1183 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
1184 | goto drop; | |
1185 | ||
8b532109 | 1186 | skb = end_dt_vrf_core(skb, slwt, AF_INET); |
664d6f86 AM |
1187 | if (!skb) |
1188 | /* packet has been processed and consumed by the VRF */ | |
1189 | return 0; | |
1190 | ||
1191 | if (IS_ERR(skb)) | |
1192 | return PTR_ERR(skb); | |
1193 | ||
1194 | iph = ip_hdr(skb); | |
1195 | ||
1196 | err = ip_route_input(skb, iph->daddr, iph->saddr, 0, skb->dev); | |
1197 | if (unlikely(err)) | |
1198 | goto drop; | |
1199 | ||
1200 | return dst_input(skb); | |
1201 | ||
1202 | drop: | |
1203 | kfree_skb(skb); | |
1204 | return -EINVAL; | |
1205 | } | |
1206 | ||
1207 | static int seg6_end_dt4_build(struct seg6_local_lwt *slwt, const void *cfg, | |
1208 | struct netlink_ext_ack *extack) | |
1209 | { | |
1210 | return __seg6_end_dt_vrf_build(slwt, cfg, AF_INET, extack); | |
1211 | } | |
20a081b7 AM |
1212 | |
1213 | static enum | |
1214 | seg6_end_dt_mode seg6_end_dt6_parse_mode(struct seg6_local_lwt *slwt) | |
1215 | { | |
1216 | unsigned long parsed_optattrs = slwt->parsed_optattrs; | |
1217 | bool legacy, vrfmode; | |
1218 | ||
300a0fd8 AM |
1219 | legacy = !!(parsed_optattrs & SEG6_F_ATTR(SEG6_LOCAL_TABLE)); |
1220 | vrfmode = !!(parsed_optattrs & SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE)); | |
20a081b7 AM |
1221 | |
1222 | if (!(legacy ^ vrfmode)) | |
1223 | /* both are absent or present: invalid DT6 mode */ | |
1224 | return DT_INVALID_MODE; | |
1225 | ||
1226 | return legacy ? DT_LEGACY_MODE : DT_VRF_MODE; | |
1227 | } | |
1228 | ||
1229 | static enum seg6_end_dt_mode seg6_end_dt6_get_mode(struct seg6_local_lwt *slwt) | |
1230 | { | |
1231 | struct seg6_end_dt_info *info = &slwt->dt_info; | |
1232 | ||
1233 | return info->mode; | |
1234 | } | |
1235 | ||
1236 | static int seg6_end_dt6_build(struct seg6_local_lwt *slwt, const void *cfg, | |
1237 | struct netlink_ext_ack *extack) | |
1238 | { | |
1239 | enum seg6_end_dt_mode mode = seg6_end_dt6_parse_mode(slwt); | |
1240 | struct seg6_end_dt_info *info = &slwt->dt_info; | |
1241 | ||
1242 | switch (mode) { | |
1243 | case DT_LEGACY_MODE: | |
1244 | info->mode = DT_LEGACY_MODE; | |
1245 | return 0; | |
1246 | case DT_VRF_MODE: | |
1247 | return __seg6_end_dt_vrf_build(slwt, cfg, AF_INET6, extack); | |
1248 | default: | |
1249 | NL_SET_ERR_MSG(extack, "table or vrftable must be specified"); | |
1250 | return -EINVAL; | |
1251 | } | |
1252 | } | |
664d6f86 AM |
1253 | #endif |
1254 | ||
891ef8dd DL |
1255 | static int input_action_end_dt6(struct sk_buff *skb, |
1256 | struct seg6_local_lwt *slwt) | |
1257 | { | |
1258 | if (!decap_and_validate(skb, IPPROTO_IPV6)) | |
1259 | goto drop; | |
1260 | ||
1261 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
1262 | goto drop; | |
1263 | ||
20a081b7 AM |
1264 | #ifdef CONFIG_NET_L3_MASTER_DEV |
1265 | if (seg6_end_dt6_get_mode(slwt) == DT_LEGACY_MODE) | |
1266 | goto legacy_mode; | |
1267 | ||
1268 | /* DT6_VRF_MODE */ | |
8b532109 | 1269 | skb = end_dt_vrf_core(skb, slwt, AF_INET6); |
20a081b7 AM |
1270 | if (!skb) |
1271 | /* packet has been processed and consumed by the VRF */ | |
1272 | return 0; | |
1273 | ||
1274 | if (IS_ERR(skb)) | |
1275 | return PTR_ERR(skb); | |
1276 | ||
1277 | /* note: this time we do not need to specify the table because the VRF | |
1278 | * takes care of selecting the correct table. | |
1279 | */ | |
1280 | seg6_lookup_any_nexthop(skb, NULL, 0, true); | |
1281 | ||
1282 | return dst_input(skb); | |
1283 | ||
1284 | legacy_mode: | |
1285 | #endif | |
c71644d0 AM |
1286 | skb_set_transport_header(skb, sizeof(struct ipv6hdr)); |
1287 | ||
fd1fef0c | 1288 | seg6_lookup_any_nexthop(skb, NULL, slwt->table, true); |
891ef8dd DL |
1289 | |
1290 | return dst_input(skb); | |
1291 | ||
1292 | drop: | |
1293 | kfree_skb(skb); | |
1294 | return -EINVAL; | |
1295 | } | |
1296 | ||
8b532109 AM |
1297 | #ifdef CONFIG_NET_L3_MASTER_DEV |
1298 | static int seg6_end_dt46_build(struct seg6_local_lwt *slwt, const void *cfg, | |
1299 | struct netlink_ext_ack *extack) | |
1300 | { | |
1301 | return __seg6_end_dt_vrf_build(slwt, cfg, AF_UNSPEC, extack); | |
1302 | } | |
1303 | ||
1304 | static int input_action_end_dt46(struct sk_buff *skb, | |
1305 | struct seg6_local_lwt *slwt) | |
1306 | { | |
1307 | unsigned int off = 0; | |
1308 | int nexthdr; | |
1309 | ||
1310 | nexthdr = ipv6_find_hdr(skb, &off, -1, NULL, NULL); | |
1311 | if (unlikely(nexthdr < 0)) | |
1312 | goto drop; | |
1313 | ||
1314 | switch (nexthdr) { | |
1315 | case IPPROTO_IPIP: | |
1316 | return input_action_end_dt4(skb, slwt); | |
1317 | case IPPROTO_IPV6: | |
1318 | return input_action_end_dt6(skb, slwt); | |
1319 | } | |
1320 | ||
1321 | drop: | |
1322 | kfree_skb(skb); | |
1323 | return -EINVAL; | |
1324 | } | |
1325 | #endif | |
1326 | ||
140f04c3 DL |
1327 | /* push an SRH on top of the current one */ |
1328 | static int input_action_end_b6(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
1329 | { | |
1330 | struct ipv6_sr_hdr *srh; | |
1331 | int err = -EINVAL; | |
1332 | ||
1333 | srh = get_and_validate_srh(skb); | |
1334 | if (!srh) | |
1335 | goto drop; | |
1336 | ||
1337 | err = seg6_do_srh_inline(skb, slwt->srh); | |
1338 | if (err) | |
1339 | goto drop; | |
1340 | ||
140f04c3 DL |
1341 | skb_set_transport_header(skb, sizeof(struct ipv6hdr)); |
1342 | ||
1c1e761e | 1343 | seg6_lookup_nexthop(skb, NULL, 0); |
140f04c3 DL |
1344 | |
1345 | return dst_input(skb); | |
1346 | ||
1347 | drop: | |
1348 | kfree_skb(skb); | |
1349 | return err; | |
1350 | } | |
1351 | ||
1352 | /* encapsulate within an outer IPv6 header and a specified SRH */ | |
1353 | static int input_action_end_b6_encap(struct sk_buff *skb, | |
1354 | struct seg6_local_lwt *slwt) | |
1355 | { | |
1356 | struct ipv6_sr_hdr *srh; | |
140f04c3 DL |
1357 | int err = -EINVAL; |
1358 | ||
1359 | srh = get_and_validate_srh(skb); | |
1360 | if (!srh) | |
1361 | goto drop; | |
1362 | ||
d7a669dd | 1363 | advance_nextseg(srh, &ipv6_hdr(skb)->daddr); |
140f04c3 DL |
1364 | |
1365 | skb_reset_inner_headers(skb); | |
1366 | skb->encapsulation = 1; | |
1367 | ||
32d99d0b | 1368 | err = seg6_do_srh_encap(skb, slwt->srh, IPPROTO_IPV6); |
140f04c3 DL |
1369 | if (err) |
1370 | goto drop; | |
1371 | ||
140f04c3 DL |
1372 | skb_set_transport_header(skb, sizeof(struct ipv6hdr)); |
1373 | ||
1c1e761e | 1374 | seg6_lookup_nexthop(skb, NULL, 0); |
140f04c3 DL |
1375 | |
1376 | return dst_input(skb); | |
1377 | ||
1378 | drop: | |
1379 | kfree_skb(skb); | |
1380 | return err; | |
1381 | } | |
1382 | ||
fe94cc29 MX |
1383 | DEFINE_PER_CPU(struct seg6_bpf_srh_state, seg6_bpf_srh_states); |
1384 | ||
486cdf21 MX |
1385 | bool seg6_bpf_has_valid_srh(struct sk_buff *skb) |
1386 | { | |
1387 | struct seg6_bpf_srh_state *srh_state = | |
1388 | this_cpu_ptr(&seg6_bpf_srh_states); | |
1389 | struct ipv6_sr_hdr *srh = srh_state->srh; | |
1390 | ||
1391 | if (unlikely(srh == NULL)) | |
1392 | return false; | |
1393 | ||
1394 | if (unlikely(!srh_state->valid)) { | |
1395 | if ((srh_state->hdrlen & 7) != 0) | |
1396 | return false; | |
1397 | ||
1398 | srh->hdrlen = (u8)(srh_state->hdrlen >> 3); | |
bb986a50 | 1399 | if (!seg6_validate_srh(srh, (srh->hdrlen + 1) << 3, true)) |
486cdf21 MX |
1400 | return false; |
1401 | ||
1402 | srh_state->valid = true; | |
1403 | } | |
1404 | ||
1405 | return true; | |
1406 | } | |
1407 | ||
004d4b27 MX |
1408 | static int input_action_end_bpf(struct sk_buff *skb, |
1409 | struct seg6_local_lwt *slwt) | |
1410 | { | |
1411 | struct seg6_bpf_srh_state *srh_state = | |
1412 | this_cpu_ptr(&seg6_bpf_srh_states); | |
004d4b27 | 1413 | struct ipv6_sr_hdr *srh; |
004d4b27 MX |
1414 | int ret; |
1415 | ||
1416 | srh = get_and_validate_srh(skb); | |
486cdf21 MX |
1417 | if (!srh) { |
1418 | kfree_skb(skb); | |
1419 | return -EINVAL; | |
1420 | } | |
004d4b27 MX |
1421 | advance_nextseg(srh, &ipv6_hdr(skb)->daddr); |
1422 | ||
1423 | /* preempt_disable is needed to protect the per-CPU buffer srh_state, | |
1424 | * which is also accessed by the bpf_lwt_seg6_* helpers | |
1425 | */ | |
1426 | preempt_disable(); | |
486cdf21 | 1427 | srh_state->srh = srh; |
004d4b27 | 1428 | srh_state->hdrlen = srh->hdrlen << 3; |
486cdf21 | 1429 | srh_state->valid = true; |
004d4b27 MX |
1430 | |
1431 | rcu_read_lock(); | |
1432 | bpf_compute_data_pointers(skb); | |
1433 | ret = bpf_prog_run_save_cb(slwt->bpf.prog, skb); | |
1434 | rcu_read_unlock(); | |
1435 | ||
004d4b27 MX |
1436 | switch (ret) { |
1437 | case BPF_OK: | |
1438 | case BPF_REDIRECT: | |
1439 | break; | |
1440 | case BPF_DROP: | |
1441 | goto drop; | |
1442 | default: | |
1443 | pr_warn_once("bpf-seg6local: Illegal return value %u\n", ret); | |
1444 | goto drop; | |
1445 | } | |
1446 | ||
486cdf21 | 1447 | if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) |
004d4b27 MX |
1448 | goto drop; |
1449 | ||
486cdf21 | 1450 | preempt_enable(); |
004d4b27 MX |
1451 | if (ret != BPF_REDIRECT) |
1452 | seg6_lookup_nexthop(skb, NULL, 0); | |
1453 | ||
1454 | return dst_input(skb); | |
1455 | ||
1456 | drop: | |
486cdf21 | 1457 | preempt_enable(); |
004d4b27 MX |
1458 | kfree_skb(skb); |
1459 | return -EINVAL; | |
1460 | } | |
1461 | ||
d1df6fd8 DL |
1462 | static struct seg6_action_desc seg6_action_table[] = { |
1463 | { | |
1464 | .action = SEG6_LOCAL_ACTION_END, | |
1465 | .attrs = 0, | |
848f3c0d | 1466 | .optattrs = SEG6_F_LOCAL_COUNTERS | |
7458575a | 1467 | SEG6_F_LOCAL_FLAVORS, |
140f04c3 DL |
1468 | .input = input_action_end, |
1469 | }, | |
1470 | { | |
1471 | .action = SEG6_LOCAL_ACTION_END_X, | |
300a0fd8 | 1472 | .attrs = SEG6_F_ATTR(SEG6_LOCAL_NH6), |
7458575a AM |
1473 | .optattrs = SEG6_F_LOCAL_COUNTERS | |
1474 | SEG6_F_LOCAL_FLAVORS, | |
140f04c3 | 1475 | .input = input_action_end_x, |
d1df6fd8 | 1476 | }, |
891ef8dd DL |
1477 | { |
1478 | .action = SEG6_LOCAL_ACTION_END_T, | |
300a0fd8 | 1479 | .attrs = SEG6_F_ATTR(SEG6_LOCAL_TABLE), |
94604548 | 1480 | .optattrs = SEG6_F_LOCAL_COUNTERS, |
891ef8dd DL |
1481 | .input = input_action_end_t, |
1482 | }, | |
1483 | { | |
1484 | .action = SEG6_LOCAL_ACTION_END_DX2, | |
300a0fd8 | 1485 | .attrs = SEG6_F_ATTR(SEG6_LOCAL_OIF), |
94604548 | 1486 | .optattrs = SEG6_F_LOCAL_COUNTERS, |
891ef8dd DL |
1487 | .input = input_action_end_dx2, |
1488 | }, | |
140f04c3 DL |
1489 | { |
1490 | .action = SEG6_LOCAL_ACTION_END_DX6, | |
300a0fd8 | 1491 | .attrs = SEG6_F_ATTR(SEG6_LOCAL_NH6), |
94604548 | 1492 | .optattrs = SEG6_F_LOCAL_COUNTERS, |
140f04c3 DL |
1493 | .input = input_action_end_dx6, |
1494 | }, | |
891ef8dd DL |
1495 | { |
1496 | .action = SEG6_LOCAL_ACTION_END_DX4, | |
300a0fd8 | 1497 | .attrs = SEG6_F_ATTR(SEG6_LOCAL_NH4), |
94604548 | 1498 | .optattrs = SEG6_F_LOCAL_COUNTERS, |
891ef8dd DL |
1499 | .input = input_action_end_dx4, |
1500 | }, | |
664d6f86 AM |
1501 | { |
1502 | .action = SEG6_LOCAL_ACTION_END_DT4, | |
300a0fd8 | 1503 | .attrs = SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE), |
94604548 | 1504 | .optattrs = SEG6_F_LOCAL_COUNTERS, |
664d6f86 AM |
1505 | #ifdef CONFIG_NET_L3_MASTER_DEV |
1506 | .input = input_action_end_dt4, | |
1507 | .slwt_ops = { | |
1508 | .build_state = seg6_end_dt4_build, | |
1509 | }, | |
1510 | #endif | |
1511 | }, | |
891ef8dd DL |
1512 | { |
1513 | .action = SEG6_LOCAL_ACTION_END_DT6, | |
20a081b7 AM |
1514 | #ifdef CONFIG_NET_L3_MASTER_DEV |
1515 | .attrs = 0, | |
94604548 AM |
1516 | .optattrs = SEG6_F_LOCAL_COUNTERS | |
1517 | SEG6_F_ATTR(SEG6_LOCAL_TABLE) | | |
300a0fd8 | 1518 | SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE), |
20a081b7 AM |
1519 | .slwt_ops = { |
1520 | .build_state = seg6_end_dt6_build, | |
1521 | }, | |
1522 | #else | |
300a0fd8 | 1523 | .attrs = SEG6_F_ATTR(SEG6_LOCAL_TABLE), |
94604548 | 1524 | .optattrs = SEG6_F_LOCAL_COUNTERS, |
20a081b7 | 1525 | #endif |
891ef8dd DL |
1526 | .input = input_action_end_dt6, |
1527 | }, | |
8b532109 AM |
1528 | { |
1529 | .action = SEG6_LOCAL_ACTION_END_DT46, | |
1530 | .attrs = SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE), | |
1531 | .optattrs = SEG6_F_LOCAL_COUNTERS, | |
1532 | #ifdef CONFIG_NET_L3_MASTER_DEV | |
1533 | .input = input_action_end_dt46, | |
1534 | .slwt_ops = { | |
1535 | .build_state = seg6_end_dt46_build, | |
1536 | }, | |
1537 | #endif | |
1538 | }, | |
140f04c3 DL |
1539 | { |
1540 | .action = SEG6_LOCAL_ACTION_END_B6, | |
300a0fd8 | 1541 | .attrs = SEG6_F_ATTR(SEG6_LOCAL_SRH), |
94604548 | 1542 | .optattrs = SEG6_F_LOCAL_COUNTERS, |
140f04c3 DL |
1543 | .input = input_action_end_b6, |
1544 | }, | |
1545 | { | |
1546 | .action = SEG6_LOCAL_ACTION_END_B6_ENCAP, | |
300a0fd8 | 1547 | .attrs = SEG6_F_ATTR(SEG6_LOCAL_SRH), |
94604548 | 1548 | .optattrs = SEG6_F_LOCAL_COUNTERS, |
140f04c3 DL |
1549 | .input = input_action_end_b6_encap, |
1550 | .static_headroom = sizeof(struct ipv6hdr), | |
004d4b27 MX |
1551 | }, |
1552 | { | |
1553 | .action = SEG6_LOCAL_ACTION_END_BPF, | |
300a0fd8 | 1554 | .attrs = SEG6_F_ATTR(SEG6_LOCAL_BPF), |
94604548 | 1555 | .optattrs = SEG6_F_LOCAL_COUNTERS, |
004d4b27 MX |
1556 | .input = input_action_end_bpf, |
1557 | }, | |
1558 | ||
d1df6fd8 DL |
1559 | }; |
1560 | ||
1561 | static struct seg6_action_desc *__get_action_desc(int action) | |
1562 | { | |
1563 | struct seg6_action_desc *desc; | |
1564 | int i, count; | |
1565 | ||
709af180 | 1566 | count = ARRAY_SIZE(seg6_action_table); |
d1df6fd8 DL |
1567 | for (i = 0; i < count; i++) { |
1568 | desc = &seg6_action_table[i]; | |
1569 | if (desc->action == action) | |
1570 | return desc; | |
1571 | } | |
1572 | ||
1573 | return NULL; | |
1574 | } | |
1575 | ||
94604548 AM |
1576 | static bool seg6_lwtunnel_counters_enabled(struct seg6_local_lwt *slwt) |
1577 | { | |
1578 | return slwt->parsed_optattrs & SEG6_F_LOCAL_COUNTERS; | |
1579 | } | |
1580 | ||
1581 | static void seg6_local_update_counters(struct seg6_local_lwt *slwt, | |
1582 | unsigned int len, int err) | |
1583 | { | |
1584 | struct pcpu_seg6_local_counters *pcounters; | |
1585 | ||
1586 | pcounters = this_cpu_ptr(slwt->pcpu_counters); | |
1587 | u64_stats_update_begin(&pcounters->syncp); | |
1588 | ||
1589 | if (likely(!err)) { | |
1590 | u64_stats_inc(&pcounters->packets); | |
1591 | u64_stats_add(&pcounters->bytes, len); | |
1592 | } else { | |
1593 | u64_stats_inc(&pcounters->errors); | |
1594 | } | |
1595 | ||
1596 | u64_stats_update_end(&pcounters->syncp); | |
1597 | } | |
1598 | ||
7a3f5b0d RS |
1599 | static int seg6_local_input_core(struct net *net, struct sock *sk, |
1600 | struct sk_buff *skb) | |
d1df6fd8 DL |
1601 | { |
1602 | struct dst_entry *orig_dst = skb_dst(skb); | |
1603 | struct seg6_action_desc *desc; | |
1604 | struct seg6_local_lwt *slwt; | |
94604548 AM |
1605 | unsigned int len = skb->len; |
1606 | int rc; | |
d1df6fd8 DL |
1607 | |
1608 | slwt = seg6_local_lwtunnel(orig_dst->lwtstate); | |
1609 | desc = slwt->desc; | |
1610 | ||
94604548 AM |
1611 | rc = desc->input(skb, slwt); |
1612 | ||
1613 | if (!seg6_lwtunnel_counters_enabled(slwt)) | |
1614 | return rc; | |
1615 | ||
1616 | seg6_local_update_counters(slwt, len, rc); | |
1617 | ||
1618 | return rc; | |
d1df6fd8 DL |
1619 | } |
1620 | ||
7a3f5b0d RS |
1621 | static int seg6_local_input(struct sk_buff *skb) |
1622 | { | |
1623 | if (skb->protocol != htons(ETH_P_IPV6)) { | |
1624 | kfree_skb(skb); | |
1625 | return -EINVAL; | |
1626 | } | |
1627 | ||
1628 | if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled)) | |
1629 | return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_IN, | |
1630 | dev_net(skb->dev), NULL, skb, skb->dev, NULL, | |
1631 | seg6_local_input_core); | |
1632 | ||
1633 | return seg6_local_input_core(dev_net(skb->dev), NULL, skb); | |
1634 | } | |
1635 | ||
d1df6fd8 DL |
1636 | static const struct nla_policy seg6_local_policy[SEG6_LOCAL_MAX + 1] = { |
1637 | [SEG6_LOCAL_ACTION] = { .type = NLA_U32 }, | |
1638 | [SEG6_LOCAL_SRH] = { .type = NLA_BINARY }, | |
1639 | [SEG6_LOCAL_TABLE] = { .type = NLA_U32 }, | |
664d6f86 | 1640 | [SEG6_LOCAL_VRFTABLE] = { .type = NLA_U32 }, |
d1df6fd8 DL |
1641 | [SEG6_LOCAL_NH4] = { .type = NLA_BINARY, |
1642 | .len = sizeof(struct in_addr) }, | |
1643 | [SEG6_LOCAL_NH6] = { .type = NLA_BINARY, | |
1644 | .len = sizeof(struct in6_addr) }, | |
1645 | [SEG6_LOCAL_IIF] = { .type = NLA_U32 }, | |
1646 | [SEG6_LOCAL_OIF] = { .type = NLA_U32 }, | |
004d4b27 | 1647 | [SEG6_LOCAL_BPF] = { .type = NLA_NESTED }, |
94604548 | 1648 | [SEG6_LOCAL_COUNTERS] = { .type = NLA_NESTED }, |
848f3c0d | 1649 | [SEG6_LOCAL_FLAVORS] = { .type = NLA_NESTED }, |
d1df6fd8 DL |
1650 | }; |
1651 | ||
e2a8ecc4 AM |
1652 | static int parse_nla_srh(struct nlattr **attrs, struct seg6_local_lwt *slwt, |
1653 | struct netlink_ext_ack *extack) | |
2d9cc60a DL |
1654 | { |
1655 | struct ipv6_sr_hdr *srh; | |
1656 | int len; | |
1657 | ||
1658 | srh = nla_data(attrs[SEG6_LOCAL_SRH]); | |
1659 | len = nla_len(attrs[SEG6_LOCAL_SRH]); | |
1660 | ||
1661 | /* SRH must contain at least one segment */ | |
1662 | if (len < sizeof(*srh) + sizeof(struct in6_addr)) | |
1663 | return -EINVAL; | |
1664 | ||
bb986a50 | 1665 | if (!seg6_validate_srh(srh, len, false)) |
2d9cc60a DL |
1666 | return -EINVAL; |
1667 | ||
7fa41efa | 1668 | slwt->srh = kmemdup(srh, len, GFP_KERNEL); |
2d9cc60a DL |
1669 | if (!slwt->srh) |
1670 | return -ENOMEM; | |
1671 | ||
2d9cc60a DL |
1672 | slwt->headroom += len; |
1673 | ||
1674 | return 0; | |
1675 | } | |
1676 | ||
1677 | static int put_nla_srh(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
1678 | { | |
1679 | struct ipv6_sr_hdr *srh; | |
1680 | struct nlattr *nla; | |
1681 | int len; | |
1682 | ||
1683 | srh = slwt->srh; | |
1684 | len = (srh->hdrlen + 1) << 3; | |
1685 | ||
1686 | nla = nla_reserve(skb, SEG6_LOCAL_SRH, len); | |
1687 | if (!nla) | |
1688 | return -EMSGSIZE; | |
1689 | ||
1690 | memcpy(nla_data(nla), srh, len); | |
1691 | ||
1692 | return 0; | |
1693 | } | |
1694 | ||
1695 | static int cmp_nla_srh(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
1696 | { | |
1697 | int len = (a->srh->hdrlen + 1) << 3; | |
1698 | ||
1699 | if (len != ((b->srh->hdrlen + 1) << 3)) | |
1700 | return 1; | |
1701 | ||
1702 | return memcmp(a->srh, b->srh, len); | |
1703 | } | |
1704 | ||
964adce5 AM |
1705 | static void destroy_attr_srh(struct seg6_local_lwt *slwt) |
1706 | { | |
1707 | kfree(slwt->srh); | |
1708 | } | |
1709 | ||
e2a8ecc4 AM |
1710 | static int parse_nla_table(struct nlattr **attrs, struct seg6_local_lwt *slwt, |
1711 | struct netlink_ext_ack *extack) | |
2d9cc60a DL |
1712 | { |
1713 | slwt->table = nla_get_u32(attrs[SEG6_LOCAL_TABLE]); | |
1714 | ||
1715 | return 0; | |
1716 | } | |
1717 | ||
1718 | static int put_nla_table(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
1719 | { | |
1720 | if (nla_put_u32(skb, SEG6_LOCAL_TABLE, slwt->table)) | |
1721 | return -EMSGSIZE; | |
1722 | ||
1723 | return 0; | |
1724 | } | |
1725 | ||
1726 | static int cmp_nla_table(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
1727 | { | |
1728 | if (a->table != b->table) | |
1729 | return 1; | |
1730 | ||
1731 | return 0; | |
1732 | } | |
1733 | ||
664d6f86 AM |
1734 | static struct |
1735 | seg6_end_dt_info *seg6_possible_end_dt_info(struct seg6_local_lwt *slwt) | |
1736 | { | |
1737 | #ifdef CONFIG_NET_L3_MASTER_DEV | |
1738 | return &slwt->dt_info; | |
1739 | #else | |
1740 | return ERR_PTR(-EOPNOTSUPP); | |
1741 | #endif | |
1742 | } | |
1743 | ||
1744 | static int parse_nla_vrftable(struct nlattr **attrs, | |
e2a8ecc4 AM |
1745 | struct seg6_local_lwt *slwt, |
1746 | struct netlink_ext_ack *extack) | |
664d6f86 AM |
1747 | { |
1748 | struct seg6_end_dt_info *info = seg6_possible_end_dt_info(slwt); | |
1749 | ||
1750 | if (IS_ERR(info)) | |
1751 | return PTR_ERR(info); | |
1752 | ||
1753 | info->vrf_table = nla_get_u32(attrs[SEG6_LOCAL_VRFTABLE]); | |
1754 | ||
1755 | return 0; | |
1756 | } | |
1757 | ||
1758 | static int put_nla_vrftable(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
1759 | { | |
1760 | struct seg6_end_dt_info *info = seg6_possible_end_dt_info(slwt); | |
1761 | ||
1762 | if (IS_ERR(info)) | |
1763 | return PTR_ERR(info); | |
1764 | ||
1765 | if (nla_put_u32(skb, SEG6_LOCAL_VRFTABLE, info->vrf_table)) | |
1766 | return -EMSGSIZE; | |
1767 | ||
1768 | return 0; | |
1769 | } | |
1770 | ||
1771 | static int cmp_nla_vrftable(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
1772 | { | |
1773 | struct seg6_end_dt_info *info_a = seg6_possible_end_dt_info(a); | |
1774 | struct seg6_end_dt_info *info_b = seg6_possible_end_dt_info(b); | |
1775 | ||
1776 | if (info_a->vrf_table != info_b->vrf_table) | |
1777 | return 1; | |
1778 | ||
1779 | return 0; | |
1780 | } | |
1781 | ||
e2a8ecc4 AM |
1782 | static int parse_nla_nh4(struct nlattr **attrs, struct seg6_local_lwt *slwt, |
1783 | struct netlink_ext_ack *extack) | |
2d9cc60a DL |
1784 | { |
1785 | memcpy(&slwt->nh4, nla_data(attrs[SEG6_LOCAL_NH4]), | |
1786 | sizeof(struct in_addr)); | |
1787 | ||
1788 | return 0; | |
1789 | } | |
1790 | ||
1791 | static int put_nla_nh4(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
1792 | { | |
1793 | struct nlattr *nla; | |
1794 | ||
1795 | nla = nla_reserve(skb, SEG6_LOCAL_NH4, sizeof(struct in_addr)); | |
1796 | if (!nla) | |
1797 | return -EMSGSIZE; | |
1798 | ||
1799 | memcpy(nla_data(nla), &slwt->nh4, sizeof(struct in_addr)); | |
1800 | ||
1801 | return 0; | |
1802 | } | |
1803 | ||
1804 | static int cmp_nla_nh4(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
1805 | { | |
1806 | return memcmp(&a->nh4, &b->nh4, sizeof(struct in_addr)); | |
1807 | } | |
1808 | ||
e2a8ecc4 AM |
1809 | static int parse_nla_nh6(struct nlattr **attrs, struct seg6_local_lwt *slwt, |
1810 | struct netlink_ext_ack *extack) | |
2d9cc60a DL |
1811 | { |
1812 | memcpy(&slwt->nh6, nla_data(attrs[SEG6_LOCAL_NH6]), | |
1813 | sizeof(struct in6_addr)); | |
1814 | ||
1815 | return 0; | |
1816 | } | |
1817 | ||
1818 | static int put_nla_nh6(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
1819 | { | |
1820 | struct nlattr *nla; | |
1821 | ||
1822 | nla = nla_reserve(skb, SEG6_LOCAL_NH6, sizeof(struct in6_addr)); | |
1823 | if (!nla) | |
1824 | return -EMSGSIZE; | |
1825 | ||
1826 | memcpy(nla_data(nla), &slwt->nh6, sizeof(struct in6_addr)); | |
1827 | ||
1828 | return 0; | |
1829 | } | |
1830 | ||
1831 | static int cmp_nla_nh6(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
1832 | { | |
1833 | return memcmp(&a->nh6, &b->nh6, sizeof(struct in6_addr)); | |
1834 | } | |
1835 | ||
e2a8ecc4 AM |
1836 | static int parse_nla_iif(struct nlattr **attrs, struct seg6_local_lwt *slwt, |
1837 | struct netlink_ext_ack *extack) | |
2d9cc60a DL |
1838 | { |
1839 | slwt->iif = nla_get_u32(attrs[SEG6_LOCAL_IIF]); | |
1840 | ||
1841 | return 0; | |
1842 | } | |
1843 | ||
1844 | static int put_nla_iif(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
1845 | { | |
1846 | if (nla_put_u32(skb, SEG6_LOCAL_IIF, slwt->iif)) | |
1847 | return -EMSGSIZE; | |
1848 | ||
1849 | return 0; | |
1850 | } | |
1851 | ||
1852 | static int cmp_nla_iif(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
1853 | { | |
1854 | if (a->iif != b->iif) | |
1855 | return 1; | |
1856 | ||
1857 | return 0; | |
1858 | } | |
1859 | ||
e2a8ecc4 AM |
1860 | static int parse_nla_oif(struct nlattr **attrs, struct seg6_local_lwt *slwt, |
1861 | struct netlink_ext_ack *extack) | |
2d9cc60a DL |
1862 | { |
1863 | slwt->oif = nla_get_u32(attrs[SEG6_LOCAL_OIF]); | |
1864 | ||
1865 | return 0; | |
1866 | } | |
1867 | ||
1868 | static int put_nla_oif(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
1869 | { | |
1870 | if (nla_put_u32(skb, SEG6_LOCAL_OIF, slwt->oif)) | |
1871 | return -EMSGSIZE; | |
1872 | ||
1873 | return 0; | |
1874 | } | |
1875 | ||
1876 | static int cmp_nla_oif(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
1877 | { | |
1878 | if (a->oif != b->oif) | |
1879 | return 1; | |
1880 | ||
1881 | return 0; | |
1882 | } | |
1883 | ||
004d4b27 MX |
1884 | #define MAX_PROG_NAME 256 |
1885 | static const struct nla_policy bpf_prog_policy[SEG6_LOCAL_BPF_PROG_MAX + 1] = { | |
1886 | [SEG6_LOCAL_BPF_PROG] = { .type = NLA_U32, }, | |
1887 | [SEG6_LOCAL_BPF_PROG_NAME] = { .type = NLA_NUL_STRING, | |
1888 | .len = MAX_PROG_NAME }, | |
1889 | }; | |
1890 | ||
e2a8ecc4 AM |
1891 | static int parse_nla_bpf(struct nlattr **attrs, struct seg6_local_lwt *slwt, |
1892 | struct netlink_ext_ack *extack) | |
004d4b27 MX |
1893 | { |
1894 | struct nlattr *tb[SEG6_LOCAL_BPF_PROG_MAX + 1]; | |
1895 | struct bpf_prog *p; | |
1896 | int ret; | |
1897 | u32 fd; | |
1898 | ||
8cb08174 JB |
1899 | ret = nla_parse_nested_deprecated(tb, SEG6_LOCAL_BPF_PROG_MAX, |
1900 | attrs[SEG6_LOCAL_BPF], | |
1901 | bpf_prog_policy, NULL); | |
004d4b27 MX |
1902 | if (ret < 0) |
1903 | return ret; | |
1904 | ||
1905 | if (!tb[SEG6_LOCAL_BPF_PROG] || !tb[SEG6_LOCAL_BPF_PROG_NAME]) | |
1906 | return -EINVAL; | |
1907 | ||
1908 | slwt->bpf.name = nla_memdup(tb[SEG6_LOCAL_BPF_PROG_NAME], GFP_KERNEL); | |
1909 | if (!slwt->bpf.name) | |
1910 | return -ENOMEM; | |
1911 | ||
1912 | fd = nla_get_u32(tb[SEG6_LOCAL_BPF_PROG]); | |
1913 | p = bpf_prog_get_type(fd, BPF_PROG_TYPE_LWT_SEG6LOCAL); | |
1914 | if (IS_ERR(p)) { | |
1915 | kfree(slwt->bpf.name); | |
1916 | return PTR_ERR(p); | |
1917 | } | |
1918 | ||
1919 | slwt->bpf.prog = p; | |
1920 | return 0; | |
1921 | } | |
1922 | ||
1923 | static int put_nla_bpf(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
1924 | { | |
1925 | struct nlattr *nest; | |
1926 | ||
1927 | if (!slwt->bpf.prog) | |
1928 | return 0; | |
1929 | ||
ae0be8de | 1930 | nest = nla_nest_start_noflag(skb, SEG6_LOCAL_BPF); |
004d4b27 MX |
1931 | if (!nest) |
1932 | return -EMSGSIZE; | |
1933 | ||
1934 | if (nla_put_u32(skb, SEG6_LOCAL_BPF_PROG, slwt->bpf.prog->aux->id)) | |
1935 | return -EMSGSIZE; | |
1936 | ||
1937 | if (slwt->bpf.name && | |
1938 | nla_put_string(skb, SEG6_LOCAL_BPF_PROG_NAME, slwt->bpf.name)) | |
1939 | return -EMSGSIZE; | |
1940 | ||
1941 | return nla_nest_end(skb, nest); | |
1942 | } | |
1943 | ||
1944 | static int cmp_nla_bpf(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
1945 | { | |
1946 | if (!a->bpf.name && !b->bpf.name) | |
1947 | return 0; | |
1948 | ||
1949 | if (!a->bpf.name || !b->bpf.name) | |
1950 | return 1; | |
1951 | ||
1952 | return strcmp(a->bpf.name, b->bpf.name); | |
1953 | } | |
1954 | ||
964adce5 AM |
1955 | static void destroy_attr_bpf(struct seg6_local_lwt *slwt) |
1956 | { | |
1957 | kfree(slwt->bpf.name); | |
1958 | if (slwt->bpf.prog) | |
1959 | bpf_prog_put(slwt->bpf.prog); | |
1960 | } | |
1961 | ||
94604548 AM |
1962 | static const struct |
1963 | nla_policy seg6_local_counters_policy[SEG6_LOCAL_CNT_MAX + 1] = { | |
1964 | [SEG6_LOCAL_CNT_PACKETS] = { .type = NLA_U64 }, | |
1965 | [SEG6_LOCAL_CNT_BYTES] = { .type = NLA_U64 }, | |
1966 | [SEG6_LOCAL_CNT_ERRORS] = { .type = NLA_U64 }, | |
1967 | }; | |
1968 | ||
1969 | static int parse_nla_counters(struct nlattr **attrs, | |
e2a8ecc4 AM |
1970 | struct seg6_local_lwt *slwt, |
1971 | struct netlink_ext_ack *extack) | |
94604548 AM |
1972 | { |
1973 | struct pcpu_seg6_local_counters __percpu *pcounters; | |
1974 | struct nlattr *tb[SEG6_LOCAL_CNT_MAX + 1]; | |
1975 | int ret; | |
1976 | ||
1977 | ret = nla_parse_nested_deprecated(tb, SEG6_LOCAL_CNT_MAX, | |
1978 | attrs[SEG6_LOCAL_COUNTERS], | |
1979 | seg6_local_counters_policy, NULL); | |
1980 | if (ret < 0) | |
1981 | return ret; | |
1982 | ||
1983 | /* basic support for SRv6 Behavior counters requires at least: | |
1984 | * packets, bytes and errors. | |
1985 | */ | |
1986 | if (!tb[SEG6_LOCAL_CNT_PACKETS] || !tb[SEG6_LOCAL_CNT_BYTES] || | |
1987 | !tb[SEG6_LOCAL_CNT_ERRORS]) | |
1988 | return -EINVAL; | |
1989 | ||
1990 | /* counters are always zero initialized */ | |
1991 | pcounters = seg6_local_alloc_pcpu_counters(GFP_KERNEL); | |
1992 | if (!pcounters) | |
1993 | return -ENOMEM; | |
1994 | ||
1995 | slwt->pcpu_counters = pcounters; | |
1996 | ||
1997 | return 0; | |
1998 | } | |
1999 | ||
2000 | static int seg6_local_fill_nla_counters(struct sk_buff *skb, | |
2001 | struct seg6_local_counters *counters) | |
2002 | { | |
2003 | if (nla_put_u64_64bit(skb, SEG6_LOCAL_CNT_PACKETS, counters->packets, | |
2004 | SEG6_LOCAL_CNT_PAD)) | |
2005 | return -EMSGSIZE; | |
2006 | ||
2007 | if (nla_put_u64_64bit(skb, SEG6_LOCAL_CNT_BYTES, counters->bytes, | |
2008 | SEG6_LOCAL_CNT_PAD)) | |
2009 | return -EMSGSIZE; | |
2010 | ||
2011 | if (nla_put_u64_64bit(skb, SEG6_LOCAL_CNT_ERRORS, counters->errors, | |
2012 | SEG6_LOCAL_CNT_PAD)) | |
2013 | return -EMSGSIZE; | |
2014 | ||
2015 | return 0; | |
2016 | } | |
2017 | ||
2018 | static int put_nla_counters(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
2019 | { | |
2020 | struct seg6_local_counters counters = { 0, 0, 0 }; | |
2021 | struct nlattr *nest; | |
2022 | int rc, i; | |
2023 | ||
2024 | nest = nla_nest_start(skb, SEG6_LOCAL_COUNTERS); | |
2025 | if (!nest) | |
2026 | return -EMSGSIZE; | |
2027 | ||
2028 | for_each_possible_cpu(i) { | |
2029 | struct pcpu_seg6_local_counters *pcounters; | |
2030 | u64 packets, bytes, errors; | |
2031 | unsigned int start; | |
2032 | ||
2033 | pcounters = per_cpu_ptr(slwt->pcpu_counters, i); | |
2034 | do { | |
d120d1a6 | 2035 | start = u64_stats_fetch_begin(&pcounters->syncp); |
94604548 AM |
2036 | |
2037 | packets = u64_stats_read(&pcounters->packets); | |
2038 | bytes = u64_stats_read(&pcounters->bytes); | |
2039 | errors = u64_stats_read(&pcounters->errors); | |
2040 | ||
d120d1a6 | 2041 | } while (u64_stats_fetch_retry(&pcounters->syncp, start)); |
94604548 AM |
2042 | |
2043 | counters.packets += packets; | |
2044 | counters.bytes += bytes; | |
2045 | counters.errors += errors; | |
2046 | } | |
2047 | ||
2048 | rc = seg6_local_fill_nla_counters(skb, &counters); | |
2049 | if (rc < 0) { | |
2050 | nla_nest_cancel(skb, nest); | |
2051 | return rc; | |
2052 | } | |
2053 | ||
2054 | return nla_nest_end(skb, nest); | |
2055 | } | |
2056 | ||
2057 | static int cmp_nla_counters(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
2058 | { | |
2059 | /* a and b are equal if both have pcpu_counters set or not */ | |
2060 | return (!!((unsigned long)a->pcpu_counters)) ^ | |
2061 | (!!((unsigned long)b->pcpu_counters)); | |
2062 | } | |
2063 | ||
2064 | static void destroy_attr_counters(struct seg6_local_lwt *slwt) | |
2065 | { | |
2066 | free_percpu(slwt->pcpu_counters); | |
2067 | } | |
2068 | ||
848f3c0d AM |
2069 | static const |
2070 | struct nla_policy seg6_local_flavors_policy[SEG6_LOCAL_FLV_MAX + 1] = { | |
2071 | [SEG6_LOCAL_FLV_OPERATION] = { .type = NLA_U32 }, | |
2072 | [SEG6_LOCAL_FLV_LCBLOCK_BITS] = { .type = NLA_U8 }, | |
2073 | [SEG6_LOCAL_FLV_LCNODE_FN_BITS] = { .type = NLA_U8 }, | |
2074 | }; | |
2075 | ||
2076 | /* check whether the lengths of the Locator-Block and Locator-Node Function | |
2077 | * are compatible with the dimension of a C-SID container. | |
2078 | */ | |
2079 | static int seg6_chk_next_csid_cfg(__u8 block_len, __u8 func_len) | |
2080 | { | |
2081 | /* Locator-Block and Locator-Node Function cannot exceed 128 bits | |
2082 | * (i.e. C-SID container lenghts). | |
2083 | */ | |
2084 | if (next_csid_chk_cntr_bits(block_len, func_len)) | |
2085 | return -EINVAL; | |
2086 | ||
2087 | /* Locator-Block length must be greater than zero and evenly divisible | |
2088 | * by 8. There must be room for a Locator-Node Function, at least. | |
2089 | */ | |
2090 | if (next_csid_chk_lcblock_bits(block_len)) | |
2091 | return -EINVAL; | |
2092 | ||
2093 | /* Locator-Node Function length must be greater than zero and evenly | |
2094 | * divisible by 8. There must be room for the Locator-Block. | |
2095 | */ | |
2096 | if (next_csid_chk_lcnode_fn_bits(func_len)) | |
2097 | return -EINVAL; | |
2098 | ||
2099 | return 0; | |
2100 | } | |
2101 | ||
2102 | static int seg6_parse_nla_next_csid_cfg(struct nlattr **tb, | |
2103 | struct seg6_flavors_info *finfo, | |
2104 | struct netlink_ext_ack *extack) | |
2105 | { | |
2106 | __u8 func_len = SEG6_LOCAL_LCNODE_FN_DBITS; | |
2107 | __u8 block_len = SEG6_LOCAL_LCBLOCK_DBITS; | |
2108 | int rc; | |
2109 | ||
2110 | if (tb[SEG6_LOCAL_FLV_LCBLOCK_BITS]) | |
2111 | block_len = nla_get_u8(tb[SEG6_LOCAL_FLV_LCBLOCK_BITS]); | |
2112 | ||
2113 | if (tb[SEG6_LOCAL_FLV_LCNODE_FN_BITS]) | |
2114 | func_len = nla_get_u8(tb[SEG6_LOCAL_FLV_LCNODE_FN_BITS]); | |
2115 | ||
2116 | rc = seg6_chk_next_csid_cfg(block_len, func_len); | |
2117 | if (rc < 0) { | |
2118 | NL_SET_ERR_MSG(extack, | |
2119 | "Invalid Locator Block/Node Function lengths"); | |
2120 | return rc; | |
2121 | } | |
2122 | ||
2123 | finfo->lcblock_bits = block_len; | |
2124 | finfo->lcnode_func_bits = func_len; | |
2125 | ||
2126 | return 0; | |
2127 | } | |
2128 | ||
2129 | static int parse_nla_flavors(struct nlattr **attrs, struct seg6_local_lwt *slwt, | |
2130 | struct netlink_ext_ack *extack) | |
2131 | { | |
2132 | struct seg6_flavors_info *finfo = &slwt->flv_info; | |
2133 | struct nlattr *tb[SEG6_LOCAL_FLV_MAX + 1]; | |
7458575a AM |
2134 | int action = slwt->action; |
2135 | __u32 fops, supp_fops; | |
848f3c0d AM |
2136 | int rc; |
2137 | ||
2138 | rc = nla_parse_nested_deprecated(tb, SEG6_LOCAL_FLV_MAX, | |
2139 | attrs[SEG6_LOCAL_FLAVORS], | |
2140 | seg6_local_flavors_policy, NULL); | |
2141 | if (rc < 0) | |
2142 | return rc; | |
2143 | ||
2144 | /* this attribute MUST always be present since it represents the Flavor | |
2145 | * operation(s) to be carried out. | |
2146 | */ | |
2147 | if (!tb[SEG6_LOCAL_FLV_OPERATION]) | |
2148 | return -EINVAL; | |
2149 | ||
2150 | fops = nla_get_u32(tb[SEG6_LOCAL_FLV_OPERATION]); | |
7458575a AM |
2151 | rc = seg6_flv_supp_ops_by_action(action, &supp_fops); |
2152 | if (rc < 0 || (fops & ~supp_fops)) { | |
848f3c0d AM |
2153 | NL_SET_ERR_MSG(extack, "Unsupported Flavor operation(s)"); |
2154 | return -EOPNOTSUPP; | |
2155 | } | |
2156 | ||
2157 | finfo->flv_ops = fops; | |
2158 | ||
2159 | if (seg6_next_csid_enabled(fops)) { | |
2160 | /* Locator-Block and Locator-Node Function lengths can be | |
2161 | * provided by the user space. Otherwise, default values are | |
2162 | * applied. | |
2163 | */ | |
2164 | rc = seg6_parse_nla_next_csid_cfg(tb, finfo, extack); | |
2165 | if (rc < 0) | |
2166 | return rc; | |
2167 | } | |
2168 | ||
2169 | return 0; | |
2170 | } | |
2171 | ||
2172 | static int seg6_fill_nla_next_csid_cfg(struct sk_buff *skb, | |
2173 | struct seg6_flavors_info *finfo) | |
2174 | { | |
2175 | if (nla_put_u8(skb, SEG6_LOCAL_FLV_LCBLOCK_BITS, finfo->lcblock_bits)) | |
2176 | return -EMSGSIZE; | |
2177 | ||
2178 | if (nla_put_u8(skb, SEG6_LOCAL_FLV_LCNODE_FN_BITS, | |
2179 | finfo->lcnode_func_bits)) | |
2180 | return -EMSGSIZE; | |
2181 | ||
2182 | return 0; | |
2183 | } | |
2184 | ||
2185 | static int put_nla_flavors(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
2186 | { | |
2187 | struct seg6_flavors_info *finfo = &slwt->flv_info; | |
2188 | __u32 fops = finfo->flv_ops; | |
2189 | struct nlattr *nest; | |
2190 | int rc; | |
2191 | ||
2192 | nest = nla_nest_start(skb, SEG6_LOCAL_FLAVORS); | |
2193 | if (!nest) | |
2194 | return -EMSGSIZE; | |
2195 | ||
2196 | if (nla_put_u32(skb, SEG6_LOCAL_FLV_OPERATION, fops)) { | |
2197 | rc = -EMSGSIZE; | |
2198 | goto err; | |
2199 | } | |
2200 | ||
2201 | if (seg6_next_csid_enabled(fops)) { | |
2202 | rc = seg6_fill_nla_next_csid_cfg(skb, finfo); | |
2203 | if (rc < 0) | |
2204 | goto err; | |
2205 | } | |
2206 | ||
2207 | return nla_nest_end(skb, nest); | |
2208 | ||
2209 | err: | |
2210 | nla_nest_cancel(skb, nest); | |
2211 | return rc; | |
2212 | } | |
2213 | ||
2214 | static int seg6_cmp_nla_next_csid_cfg(struct seg6_flavors_info *finfo_a, | |
2215 | struct seg6_flavors_info *finfo_b) | |
2216 | { | |
2217 | if (finfo_a->lcblock_bits != finfo_b->lcblock_bits) | |
2218 | return 1; | |
2219 | ||
2220 | if (finfo_a->lcnode_func_bits != finfo_b->lcnode_func_bits) | |
2221 | return 1; | |
2222 | ||
2223 | return 0; | |
2224 | } | |
2225 | ||
2226 | static int cmp_nla_flavors(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
2227 | { | |
2228 | struct seg6_flavors_info *finfo_a = &a->flv_info; | |
2229 | struct seg6_flavors_info *finfo_b = &b->flv_info; | |
2230 | ||
2231 | if (finfo_a->flv_ops != finfo_b->flv_ops) | |
2232 | return 1; | |
2233 | ||
2234 | if (seg6_next_csid_enabled(finfo_a->flv_ops)) { | |
2235 | if (seg6_cmp_nla_next_csid_cfg(finfo_a, finfo_b)) | |
2236 | return 1; | |
2237 | } | |
2238 | ||
2239 | return 0; | |
2240 | } | |
2241 | ||
2242 | static int encap_size_flavors(struct seg6_local_lwt *slwt) | |
2243 | { | |
2244 | struct seg6_flavors_info *finfo = &slwt->flv_info; | |
2245 | int nlsize; | |
2246 | ||
2247 | nlsize = nla_total_size(0) + /* nest SEG6_LOCAL_FLAVORS */ | |
2248 | nla_total_size(4); /* SEG6_LOCAL_FLV_OPERATION */ | |
2249 | ||
2250 | if (seg6_next_csid_enabled(finfo->flv_ops)) | |
2251 | nlsize += nla_total_size(1) + /* SEG6_LOCAL_FLV_LCBLOCK_BITS */ | |
2252 | nla_total_size(1); /* SEG6_LOCAL_FLV_LCNODE_FN_BITS */ | |
2253 | ||
2254 | return nlsize; | |
2255 | } | |
2256 | ||
d1df6fd8 | 2257 | struct seg6_action_param { |
e2a8ecc4 AM |
2258 | int (*parse)(struct nlattr **attrs, struct seg6_local_lwt *slwt, |
2259 | struct netlink_ext_ack *extack); | |
d1df6fd8 DL |
2260 | int (*put)(struct sk_buff *skb, struct seg6_local_lwt *slwt); |
2261 | int (*cmp)(struct seg6_local_lwt *a, struct seg6_local_lwt *b); | |
964adce5 AM |
2262 | |
2263 | /* optional destroy() callback useful for releasing resources which | |
2264 | * have been previously acquired in the corresponding parse() | |
2265 | * function. | |
2266 | */ | |
2267 | void (*destroy)(struct seg6_local_lwt *slwt); | |
d1df6fd8 DL |
2268 | }; |
2269 | ||
2270 | static struct seg6_action_param seg6_action_params[SEG6_LOCAL_MAX + 1] = { | |
2d9cc60a DL |
2271 | [SEG6_LOCAL_SRH] = { .parse = parse_nla_srh, |
2272 | .put = put_nla_srh, | |
964adce5 AM |
2273 | .cmp = cmp_nla_srh, |
2274 | .destroy = destroy_attr_srh }, | |
d1df6fd8 | 2275 | |
2d9cc60a DL |
2276 | [SEG6_LOCAL_TABLE] = { .parse = parse_nla_table, |
2277 | .put = put_nla_table, | |
2278 | .cmp = cmp_nla_table }, | |
d1df6fd8 | 2279 | |
2d9cc60a DL |
2280 | [SEG6_LOCAL_NH4] = { .parse = parse_nla_nh4, |
2281 | .put = put_nla_nh4, | |
2282 | .cmp = cmp_nla_nh4 }, | |
d1df6fd8 | 2283 | |
2d9cc60a DL |
2284 | [SEG6_LOCAL_NH6] = { .parse = parse_nla_nh6, |
2285 | .put = put_nla_nh6, | |
2286 | .cmp = cmp_nla_nh6 }, | |
d1df6fd8 | 2287 | |
2d9cc60a DL |
2288 | [SEG6_LOCAL_IIF] = { .parse = parse_nla_iif, |
2289 | .put = put_nla_iif, | |
2290 | .cmp = cmp_nla_iif }, | |
d1df6fd8 | 2291 | |
2d9cc60a DL |
2292 | [SEG6_LOCAL_OIF] = { .parse = parse_nla_oif, |
2293 | .put = put_nla_oif, | |
2294 | .cmp = cmp_nla_oif }, | |
004d4b27 MX |
2295 | |
2296 | [SEG6_LOCAL_BPF] = { .parse = parse_nla_bpf, | |
2297 | .put = put_nla_bpf, | |
964adce5 AM |
2298 | .cmp = cmp_nla_bpf, |
2299 | .destroy = destroy_attr_bpf }, | |
004d4b27 | 2300 | |
664d6f86 AM |
2301 | [SEG6_LOCAL_VRFTABLE] = { .parse = parse_nla_vrftable, |
2302 | .put = put_nla_vrftable, | |
2303 | .cmp = cmp_nla_vrftable }, | |
2304 | ||
94604548 AM |
2305 | [SEG6_LOCAL_COUNTERS] = { .parse = parse_nla_counters, |
2306 | .put = put_nla_counters, | |
2307 | .cmp = cmp_nla_counters, | |
2308 | .destroy = destroy_attr_counters }, | |
848f3c0d AM |
2309 | |
2310 | [SEG6_LOCAL_FLAVORS] = { .parse = parse_nla_flavors, | |
2311 | .put = put_nla_flavors, | |
2312 | .cmp = cmp_nla_flavors }, | |
d1df6fd8 DL |
2313 | }; |
2314 | ||
964adce5 | 2315 | /* call the destroy() callback (if available) for each set attribute in |
0a3021f1 AM |
2316 | * @parsed_attrs, starting from the first attribute up to the @max_parsed |
2317 | * (excluded) attribute. | |
964adce5 | 2318 | */ |
0a3021f1 AM |
2319 | static void __destroy_attrs(unsigned long parsed_attrs, int max_parsed, |
2320 | struct seg6_local_lwt *slwt) | |
964adce5 | 2321 | { |
964adce5 AM |
2322 | struct seg6_action_param *param; |
2323 | int i; | |
2324 | ||
2325 | /* Every required seg6local attribute is identified by an ID which is | |
2326 | * encoded as a flag (i.e: 1 << ID) in the 'attrs' bitmask; | |
2327 | * | |
0a3021f1 | 2328 | * We scan the 'parsed_attrs' bitmask, starting from the first attribute |
964adce5 AM |
2329 | * up to the @max_parsed (excluded) attribute. |
2330 | * For each set attribute, we retrieve the corresponding destroy() | |
2331 | * callback. If the callback is not available, then we skip to the next | |
2332 | * attribute; otherwise, we call the destroy() callback. | |
2333 | */ | |
ac0dbed9 | 2334 | for (i = SEG6_LOCAL_SRH; i < max_parsed; ++i) { |
300a0fd8 | 2335 | if (!(parsed_attrs & SEG6_F_ATTR(i))) |
964adce5 AM |
2336 | continue; |
2337 | ||
2338 | param = &seg6_action_params[i]; | |
2339 | ||
2340 | if (param->destroy) | |
2341 | param->destroy(slwt); | |
2342 | } | |
2343 | } | |
2344 | ||
2345 | /* release all the resources that may have been acquired during parsing | |
2346 | * operations. | |
2347 | */ | |
2348 | static void destroy_attrs(struct seg6_local_lwt *slwt) | |
2349 | { | |
0a3021f1 AM |
2350 | unsigned long attrs = slwt->desc->attrs | slwt->parsed_optattrs; |
2351 | ||
2352 | __destroy_attrs(attrs, SEG6_LOCAL_MAX + 1, slwt); | |
2353 | } | |
2354 | ||
2355 | static int parse_nla_optional_attrs(struct nlattr **attrs, | |
e2a8ecc4 AM |
2356 | struct seg6_local_lwt *slwt, |
2357 | struct netlink_ext_ack *extack) | |
0a3021f1 AM |
2358 | { |
2359 | struct seg6_action_desc *desc = slwt->desc; | |
2360 | unsigned long parsed_optattrs = 0; | |
2361 | struct seg6_action_param *param; | |
2362 | int err, i; | |
2363 | ||
ac0dbed9 | 2364 | for (i = SEG6_LOCAL_SRH; i < SEG6_LOCAL_MAX + 1; ++i) { |
300a0fd8 | 2365 | if (!(desc->optattrs & SEG6_F_ATTR(i)) || !attrs[i]) |
0a3021f1 AM |
2366 | continue; |
2367 | ||
2368 | /* once here, the i-th attribute is provided by the | |
2369 | * userspace AND it is identified optional as well. | |
2370 | */ | |
2371 | param = &seg6_action_params[i]; | |
2372 | ||
e2a8ecc4 | 2373 | err = param->parse(attrs, slwt, extack); |
0a3021f1 AM |
2374 | if (err < 0) |
2375 | goto parse_optattrs_err; | |
2376 | ||
2377 | /* current attribute has been correctly parsed */ | |
300a0fd8 | 2378 | parsed_optattrs |= SEG6_F_ATTR(i); |
0a3021f1 AM |
2379 | } |
2380 | ||
2381 | /* store in the tunnel state all the optional attributed successfully | |
2382 | * parsed. | |
2383 | */ | |
2384 | slwt->parsed_optattrs = parsed_optattrs; | |
2385 | ||
2386 | return 0; | |
2387 | ||
2388 | parse_optattrs_err: | |
2389 | __destroy_attrs(parsed_optattrs, i, slwt); | |
2390 | ||
2391 | return err; | |
964adce5 AM |
2392 | } |
2393 | ||
cfdf64a0 AM |
2394 | /* call the custom constructor of the behavior during its initialization phase |
2395 | * and after that all its attributes have been parsed successfully. | |
2396 | */ | |
2397 | static int | |
2398 | seg6_local_lwtunnel_build_state(struct seg6_local_lwt *slwt, const void *cfg, | |
2399 | struct netlink_ext_ack *extack) | |
2400 | { | |
2401 | struct seg6_action_desc *desc = slwt->desc; | |
2402 | struct seg6_local_lwtunnel_ops *ops; | |
2403 | ||
2404 | ops = &desc->slwt_ops; | |
2405 | if (!ops->build_state) | |
2406 | return 0; | |
2407 | ||
2408 | return ops->build_state(slwt, cfg, extack); | |
2409 | } | |
2410 | ||
2411 | /* call the custom destructor of the behavior which is invoked before the | |
2412 | * tunnel is going to be destroyed. | |
2413 | */ | |
2414 | static void seg6_local_lwtunnel_destroy_state(struct seg6_local_lwt *slwt) | |
2415 | { | |
2416 | struct seg6_action_desc *desc = slwt->desc; | |
2417 | struct seg6_local_lwtunnel_ops *ops; | |
2418 | ||
2419 | ops = &desc->slwt_ops; | |
2420 | if (!ops->destroy_state) | |
2421 | return; | |
2422 | ||
2423 | ops->destroy_state(slwt); | |
2424 | } | |
2425 | ||
e2a8ecc4 AM |
2426 | static int parse_nla_action(struct nlattr **attrs, struct seg6_local_lwt *slwt, |
2427 | struct netlink_ext_ack *extack) | |
d1df6fd8 DL |
2428 | { |
2429 | struct seg6_action_param *param; | |
2430 | struct seg6_action_desc *desc; | |
0a3021f1 | 2431 | unsigned long invalid_attrs; |
d1df6fd8 DL |
2432 | int i, err; |
2433 | ||
2434 | desc = __get_action_desc(slwt->action); | |
2435 | if (!desc) | |
2436 | return -EINVAL; | |
2437 | ||
2438 | if (!desc->input) | |
2439 | return -EOPNOTSUPP; | |
2440 | ||
2441 | slwt->desc = desc; | |
2442 | slwt->headroom += desc->static_headroom; | |
2443 | ||
0a3021f1 AM |
2444 | /* Forcing the desc->optattrs *set* and the desc->attrs *set* to be |
2445 | * disjoined, this allow us to release acquired resources by optional | |
2446 | * attributes and by required attributes independently from each other | |
0d770360 | 2447 | * without any interference. |
0a3021f1 AM |
2448 | * In other terms, we are sure that we do not release some the acquired |
2449 | * resources twice. | |
2450 | * | |
2451 | * Note that if an attribute is configured both as required and as | |
2452 | * optional, it means that the user has messed something up in the | |
2453 | * seg6_action_table. Therefore, this check is required for SRv6 | |
2454 | * behaviors to work properly. | |
2455 | */ | |
2456 | invalid_attrs = desc->attrs & desc->optattrs; | |
2457 | if (invalid_attrs) { | |
2458 | WARN_ONCE(1, | |
2459 | "An attribute cannot be both required AND optional"); | |
2460 | return -EINVAL; | |
2461 | } | |
2462 | ||
2463 | /* parse the required attributes */ | |
ac0dbed9 | 2464 | for (i = SEG6_LOCAL_SRH; i < SEG6_LOCAL_MAX + 1; i++) { |
300a0fd8 | 2465 | if (desc->attrs & SEG6_F_ATTR(i)) { |
d1df6fd8 DL |
2466 | if (!attrs[i]) |
2467 | return -EINVAL; | |
2468 | ||
2469 | param = &seg6_action_params[i]; | |
2470 | ||
e2a8ecc4 | 2471 | err = param->parse(attrs, slwt, extack); |
d1df6fd8 | 2472 | if (err < 0) |
0a3021f1 | 2473 | goto parse_attrs_err; |
d1df6fd8 DL |
2474 | } |
2475 | } | |
2476 | ||
0a3021f1 | 2477 | /* parse the optional attributes, if any */ |
e2a8ecc4 | 2478 | err = parse_nla_optional_attrs(attrs, slwt, extack); |
0a3021f1 AM |
2479 | if (err < 0) |
2480 | goto parse_attrs_err; | |
2481 | ||
d1df6fd8 | 2482 | return 0; |
964adce5 | 2483 | |
0a3021f1 | 2484 | parse_attrs_err: |
964adce5 AM |
2485 | /* release any resource that may have been acquired during the i-1 |
2486 | * parse() operations. | |
2487 | */ | |
0a3021f1 | 2488 | __destroy_attrs(desc->attrs, i, slwt); |
964adce5 AM |
2489 | |
2490 | return err; | |
d1df6fd8 DL |
2491 | } |
2492 | ||
faee6769 AA |
2493 | static int seg6_local_build_state(struct net *net, struct nlattr *nla, |
2494 | unsigned int family, const void *cfg, | |
2495 | struct lwtunnel_state **ts, | |
d1df6fd8 DL |
2496 | struct netlink_ext_ack *extack) |
2497 | { | |
2498 | struct nlattr *tb[SEG6_LOCAL_MAX + 1]; | |
2499 | struct lwtunnel_state *newts; | |
2500 | struct seg6_local_lwt *slwt; | |
2501 | int err; | |
2502 | ||
6285217f DL |
2503 | if (family != AF_INET6) |
2504 | return -EINVAL; | |
2505 | ||
8cb08174 JB |
2506 | err = nla_parse_nested_deprecated(tb, SEG6_LOCAL_MAX, nla, |
2507 | seg6_local_policy, extack); | |
d1df6fd8 DL |
2508 | |
2509 | if (err < 0) | |
2510 | return err; | |
2511 | ||
2512 | if (!tb[SEG6_LOCAL_ACTION]) | |
2513 | return -EINVAL; | |
2514 | ||
2515 | newts = lwtunnel_state_alloc(sizeof(*slwt)); | |
2516 | if (!newts) | |
2517 | return -ENOMEM; | |
2518 | ||
2519 | slwt = seg6_local_lwtunnel(newts); | |
2520 | slwt->action = nla_get_u32(tb[SEG6_LOCAL_ACTION]); | |
2521 | ||
e2a8ecc4 | 2522 | err = parse_nla_action(tb, slwt, extack); |
d1df6fd8 DL |
2523 | if (err < 0) |
2524 | goto out_free; | |
2525 | ||
cfdf64a0 AM |
2526 | err = seg6_local_lwtunnel_build_state(slwt, cfg, extack); |
2527 | if (err < 0) | |
2528 | goto out_destroy_attrs; | |
2529 | ||
d1df6fd8 DL |
2530 | newts->type = LWTUNNEL_ENCAP_SEG6_LOCAL; |
2531 | newts->flags = LWTUNNEL_STATE_INPUT_REDIRECT; | |
2532 | newts->headroom = slwt->headroom; | |
2533 | ||
2534 | *ts = newts; | |
2535 | ||
2536 | return 0; | |
2537 | ||
cfdf64a0 AM |
2538 | out_destroy_attrs: |
2539 | destroy_attrs(slwt); | |
d1df6fd8 | 2540 | out_free: |
d1df6fd8 DL |
2541 | kfree(newts); |
2542 | return err; | |
2543 | } | |
2544 | ||
2545 | static void seg6_local_destroy_state(struct lwtunnel_state *lwt) | |
2546 | { | |
2547 | struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt); | |
2548 | ||
cfdf64a0 AM |
2549 | seg6_local_lwtunnel_destroy_state(slwt); |
2550 | ||
964adce5 | 2551 | destroy_attrs(slwt); |
004d4b27 MX |
2552 | |
2553 | return; | |
d1df6fd8 DL |
2554 | } |
2555 | ||
2556 | static int seg6_local_fill_encap(struct sk_buff *skb, | |
2557 | struct lwtunnel_state *lwt) | |
2558 | { | |
2559 | struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt); | |
2560 | struct seg6_action_param *param; | |
0a3021f1 | 2561 | unsigned long attrs; |
d1df6fd8 DL |
2562 | int i, err; |
2563 | ||
2564 | if (nla_put_u32(skb, SEG6_LOCAL_ACTION, slwt->action)) | |
2565 | return -EMSGSIZE; | |
2566 | ||
0a3021f1 AM |
2567 | attrs = slwt->desc->attrs | slwt->parsed_optattrs; |
2568 | ||
ac0dbed9 | 2569 | for (i = SEG6_LOCAL_SRH; i < SEG6_LOCAL_MAX + 1; i++) { |
300a0fd8 | 2570 | if (attrs & SEG6_F_ATTR(i)) { |
d1df6fd8 DL |
2571 | param = &seg6_action_params[i]; |
2572 | err = param->put(skb, slwt); | |
2573 | if (err < 0) | |
2574 | return err; | |
2575 | } | |
2576 | } | |
2577 | ||
2578 | return 0; | |
2579 | } | |
2580 | ||
2581 | static int seg6_local_get_encap_size(struct lwtunnel_state *lwt) | |
2582 | { | |
2583 | struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt); | |
2584 | unsigned long attrs; | |
2585 | int nlsize; | |
2586 | ||
2587 | nlsize = nla_total_size(4); /* action */ | |
2588 | ||
0a3021f1 | 2589 | attrs = slwt->desc->attrs | slwt->parsed_optattrs; |
d1df6fd8 | 2590 | |
300a0fd8 | 2591 | if (attrs & SEG6_F_ATTR(SEG6_LOCAL_SRH)) |
d1df6fd8 DL |
2592 | nlsize += nla_total_size((slwt->srh->hdrlen + 1) << 3); |
2593 | ||
300a0fd8 | 2594 | if (attrs & SEG6_F_ATTR(SEG6_LOCAL_TABLE)) |
d1df6fd8 DL |
2595 | nlsize += nla_total_size(4); |
2596 | ||
300a0fd8 | 2597 | if (attrs & SEG6_F_ATTR(SEG6_LOCAL_NH4)) |
d1df6fd8 DL |
2598 | nlsize += nla_total_size(4); |
2599 | ||
300a0fd8 | 2600 | if (attrs & SEG6_F_ATTR(SEG6_LOCAL_NH6)) |
d1df6fd8 DL |
2601 | nlsize += nla_total_size(16); |
2602 | ||
300a0fd8 | 2603 | if (attrs & SEG6_F_ATTR(SEG6_LOCAL_IIF)) |
d1df6fd8 DL |
2604 | nlsize += nla_total_size(4); |
2605 | ||
300a0fd8 | 2606 | if (attrs & SEG6_F_ATTR(SEG6_LOCAL_OIF)) |
d1df6fd8 DL |
2607 | nlsize += nla_total_size(4); |
2608 | ||
300a0fd8 | 2609 | if (attrs & SEG6_F_ATTR(SEG6_LOCAL_BPF)) |
004d4b27 MX |
2610 | nlsize += nla_total_size(sizeof(struct nlattr)) + |
2611 | nla_total_size(MAX_PROG_NAME) + | |
2612 | nla_total_size(4); | |
2613 | ||
300a0fd8 | 2614 | if (attrs & SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE)) |
664d6f86 AM |
2615 | nlsize += nla_total_size(4); |
2616 | ||
94604548 AM |
2617 | if (attrs & SEG6_F_LOCAL_COUNTERS) |
2618 | nlsize += nla_total_size(0) + /* nest SEG6_LOCAL_COUNTERS */ | |
2619 | /* SEG6_LOCAL_CNT_PACKETS */ | |
2620 | nla_total_size_64bit(sizeof(__u64)) + | |
2621 | /* SEG6_LOCAL_CNT_BYTES */ | |
2622 | nla_total_size_64bit(sizeof(__u64)) + | |
2623 | /* SEG6_LOCAL_CNT_ERRORS */ | |
2624 | nla_total_size_64bit(sizeof(__u64)); | |
2625 | ||
848f3c0d AM |
2626 | if (attrs & SEG6_F_ATTR(SEG6_LOCAL_FLAVORS)) |
2627 | nlsize += encap_size_flavors(slwt); | |
2628 | ||
d1df6fd8 DL |
2629 | return nlsize; |
2630 | } | |
2631 | ||
2632 | static int seg6_local_cmp_encap(struct lwtunnel_state *a, | |
2633 | struct lwtunnel_state *b) | |
2634 | { | |
2635 | struct seg6_local_lwt *slwt_a, *slwt_b; | |
2636 | struct seg6_action_param *param; | |
0a3021f1 | 2637 | unsigned long attrs_a, attrs_b; |
d1df6fd8 DL |
2638 | int i; |
2639 | ||
2640 | slwt_a = seg6_local_lwtunnel(a); | |
2641 | slwt_b = seg6_local_lwtunnel(b); | |
2642 | ||
2643 | if (slwt_a->action != slwt_b->action) | |
2644 | return 1; | |
2645 | ||
0a3021f1 AM |
2646 | attrs_a = slwt_a->desc->attrs | slwt_a->parsed_optattrs; |
2647 | attrs_b = slwt_b->desc->attrs | slwt_b->parsed_optattrs; | |
2648 | ||
2649 | if (attrs_a != attrs_b) | |
d1df6fd8 DL |
2650 | return 1; |
2651 | ||
ac0dbed9 | 2652 | for (i = SEG6_LOCAL_SRH; i < SEG6_LOCAL_MAX + 1; i++) { |
300a0fd8 | 2653 | if (attrs_a & SEG6_F_ATTR(i)) { |
d1df6fd8 DL |
2654 | param = &seg6_action_params[i]; |
2655 | if (param->cmp(slwt_a, slwt_b)) | |
2656 | return 1; | |
2657 | } | |
2658 | } | |
2659 | ||
2660 | return 0; | |
2661 | } | |
2662 | ||
2663 | static const struct lwtunnel_encap_ops seg6_local_ops = { | |
2664 | .build_state = seg6_local_build_state, | |
2665 | .destroy_state = seg6_local_destroy_state, | |
2666 | .input = seg6_local_input, | |
2667 | .fill_encap = seg6_local_fill_encap, | |
2668 | .get_encap_size = seg6_local_get_encap_size, | |
2669 | .cmp_encap = seg6_local_cmp_encap, | |
2670 | .owner = THIS_MODULE, | |
2671 | }; | |
2672 | ||
2673 | int __init seg6_local_init(void) | |
2674 | { | |
300a0fd8 AM |
2675 | /* If the max total number of defined attributes is reached, then your |
2676 | * kernel build stops here. | |
2677 | * | |
2678 | * This check is required to avoid arithmetic overflows when processing | |
2679 | * behavior attributes and the maximum number of defined attributes | |
2680 | * exceeds the allowed value. | |
2681 | */ | |
2682 | BUILD_BUG_ON(SEG6_LOCAL_MAX + 1 > BITS_PER_TYPE(unsigned long)); | |
2683 | ||
7458575a AM |
2684 | /* Check whether the number of defined flavors exceeds the maximum |
2685 | * allowed value. | |
2686 | */ | |
2687 | BUILD_BUG_ON(SEG6_LOCAL_FLV_OP_MAX + 1 > BITS_PER_TYPE(__u32)); | |
2688 | ||
848f3c0d AM |
2689 | /* If the default NEXT-C-SID Locator-Block/Node Function lengths (in |
2690 | * bits) have been changed with invalid values, kernel build stops | |
2691 | * here. | |
2692 | */ | |
2693 | BUILD_BUG_ON(next_csid_chk_cntr_bits(SEG6_LOCAL_LCBLOCK_DBITS, | |
2694 | SEG6_LOCAL_LCNODE_FN_DBITS)); | |
2695 | BUILD_BUG_ON(next_csid_chk_lcblock_bits(SEG6_LOCAL_LCBLOCK_DBITS)); | |
2696 | BUILD_BUG_ON(next_csid_chk_lcnode_fn_bits(SEG6_LOCAL_LCNODE_FN_DBITS)); | |
2697 | ||
bdf3c0b9 AM |
2698 | /* To be memory efficient, we use 'u8' to represent the different |
2699 | * actions related to RFC8986 flavors. If the kernel build stops here, | |
2700 | * it means that it is not possible to correctly encode these actions | |
2701 | * with the data type chosen for the action table. | |
2702 | */ | |
2703 | BUILD_BUG_ON(SEG6_LOCAL_FLV_ACT_MAX > (typeof(flv8986_act_tbl[0]))~0U); | |
2704 | ||
d1df6fd8 DL |
2705 | return lwtunnel_encap_add_ops(&seg6_local_ops, |
2706 | LWTUNNEL_ENCAP_SEG6_LOCAL); | |
2707 | } | |
2708 | ||
2709 | void seg6_local_exit(void) | |
2710 | { | |
2711 | lwtunnel_encap_del_ops(&seg6_local_ops, LWTUNNEL_ENCAP_SEG6_LOCAL); | |
2712 | } |