1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Shared Memory Communications over RDMA (SMC-R) and RoCE
4 *
5 * CLC (connection layer control) handshake over initial TCP socket to
6 * prepare for RDMA traffic
7 *
8 * Copyright IBM Corp. 2016, 2018
9 *
10 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
11 */
12
13 #include <linux/in.h>
14 #include <linux/inetdevice.h>
15 #include <linux/if_ether.h>
16 #include <linux/sched/signal.h>
17 #include <linux/utsname.h>
18 #include <linux/ctype.h>
19
20 #include <net/addrconf.h>
21 #include <net/sock.h>
22 #include <net/tcp.h>
23
24 #include "smc.h"
25 #include "smc_core.h"
26 #include "smc_clc.h"
27 #include "smc_ib.h"
28 #include "smc_ism.h"
29 #include "smc_netlink.h"
30
31 #define SMCR_CLC_ACCEPT_CONFIRM_LEN 68
32 #define SMCD_CLC_ACCEPT_CONFIRM_LEN 48
33 #define SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 78
34 #define SMCR_CLC_ACCEPT_CONFIRM_LEN_V2 108
35 #define SMC_CLC_RECV_BUF_LEN 100
36
37 /* eye catcher "SMCR" EBCDIC for CLC messages */
38 static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'};
39 /* eye catcher "SMCD" EBCDIC for CLC messages */
40 static const char SMCD_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xc4'};
41
42 static u8 smc_hostname[SMC_MAX_HOSTNAME_LEN];
43
44 struct smc_clc_eid_table {
45 rwlock_t lock;
46 struct list_head list;
47 u8 ueid_cnt;
48 u8 seid_enabled;
49 };
50
51 static struct smc_clc_eid_table smc_clc_eid_table;
52
53 struct smc_clc_eid_entry {
54 struct list_head list;
55 u8 eid[SMC_MAX_EID_LEN];
56 };
57
58 /* The size of a user EID is 32 characters.
59 * Valid characters should be (single-byte character set) A-Z, 0-9, '.' and '-'.
60 * Blanks should only be used to pad to the expected size.
61 * First character must be alphanumeric.
62 */
smc_clc_ueid_valid(char * ueid)63 static bool smc_clc_ueid_valid(char *ueid)
64 {
65 char *end = ueid + SMC_MAX_EID_LEN;
66
67 while (--end >= ueid && isspace(*end))
68 ;
69 if (end < ueid)
70 return false;
71 if (!isalnum(*ueid) || islower(*ueid))
72 return false;
73 while (ueid <= end) {
74 if ((!isalnum(*ueid) || islower(*ueid)) && *ueid != '.' &&
75 *ueid != '-')
76 return false;
77 ueid++;
78 }
79 return true;
80 }
81
smc_clc_ueid_add(char * ueid)82 static int smc_clc_ueid_add(char *ueid)
83 {
84 struct smc_clc_eid_entry *new_ueid, *tmp_ueid;
85 int rc;
86
87 if (!smc_clc_ueid_valid(ueid))
88 return -EINVAL;
89
90 /* add a new ueid entry to the ueid table if there isn't one */
91 new_ueid = kzalloc(sizeof(*new_ueid), GFP_KERNEL);
92 if (!new_ueid)
93 return -ENOMEM;
94 memcpy(new_ueid->eid, ueid, SMC_MAX_EID_LEN);
95
96 write_lock(&smc_clc_eid_table.lock);
97 if (smc_clc_eid_table.ueid_cnt >= SMC_MAX_UEID) {
98 rc = -ERANGE;
99 goto err_out;
100 }
101 list_for_each_entry(tmp_ueid, &smc_clc_eid_table.list, list) {
102 if (!memcmp(tmp_ueid->eid, ueid, SMC_MAX_EID_LEN)) {
103 rc = -EEXIST;
104 goto err_out;
105 }
106 }
107 list_add_tail(&new_ueid->list, &smc_clc_eid_table.list);
108 smc_clc_eid_table.ueid_cnt++;
109 write_unlock(&smc_clc_eid_table.lock);
110 return 0;
111
112 err_out:
113 write_unlock(&smc_clc_eid_table.lock);
114 kfree(new_ueid);
115 return rc;
116 }
117
smc_clc_ueid_count(void)118 int smc_clc_ueid_count(void)
119 {
120 int count;
121
122 read_lock(&smc_clc_eid_table.lock);
123 count = smc_clc_eid_table.ueid_cnt;
124 read_unlock(&smc_clc_eid_table.lock);
125
126 return count;
127 }
128
smc_nl_add_ueid(struct sk_buff * skb,struct genl_info * info)129 int smc_nl_add_ueid(struct sk_buff *skb, struct genl_info *info)
130 {
131 struct nlattr *nla_ueid = info->attrs[SMC_NLA_EID_TABLE_ENTRY];
132 char *ueid;
133
134 if (!nla_ueid || nla_len(nla_ueid) != SMC_MAX_EID_LEN + 1)
135 return -EINVAL;
136 ueid = (char *)nla_data(nla_ueid);
137
138 return smc_clc_ueid_add(ueid);
139 }
140
141 /* remove one or all ueid entries from the table */
smc_clc_ueid_remove(char * ueid)142 static int smc_clc_ueid_remove(char *ueid)
143 {
144 struct smc_clc_eid_entry *lst_ueid, *tmp_ueid;
145 int rc = -ENOENT;
146
147 /* remove table entry */
148 write_lock(&smc_clc_eid_table.lock);
149 list_for_each_entry_safe(lst_ueid, tmp_ueid, &smc_clc_eid_table.list,
150 list) {
151 if (!ueid || !memcmp(lst_ueid->eid, ueid, SMC_MAX_EID_LEN)) {
152 list_del(&lst_ueid->list);
153 smc_clc_eid_table.ueid_cnt--;
154 kfree(lst_ueid);
155 rc = 0;
156 }
157 }
158 #if IS_ENABLED(CONFIG_S390)
159 if (!rc && !smc_clc_eid_table.ueid_cnt) {
160 smc_clc_eid_table.seid_enabled = 1;
161 rc = -EAGAIN; /* indicate success and enabling of seid */
162 }
163 #endif
164 write_unlock(&smc_clc_eid_table.lock);
165 return rc;
166 }
167
smc_nl_remove_ueid(struct sk_buff * skb,struct genl_info * info)168 int smc_nl_remove_ueid(struct sk_buff *skb, struct genl_info *info)
169 {
170 struct nlattr *nla_ueid = info->attrs[SMC_NLA_EID_TABLE_ENTRY];
171 char *ueid;
172
173 if (!nla_ueid || nla_len(nla_ueid) != SMC_MAX_EID_LEN + 1)
174 return -EINVAL;
175 ueid = (char *)nla_data(nla_ueid);
176
177 return smc_clc_ueid_remove(ueid);
178 }
179
smc_nl_flush_ueid(struct sk_buff * skb,struct genl_info * info)180 int smc_nl_flush_ueid(struct sk_buff *skb, struct genl_info *info)
181 {
182 smc_clc_ueid_remove(NULL);
183 return 0;
184 }
185
smc_nl_ueid_dumpinfo(struct sk_buff * skb,u32 portid,u32 seq,u32 flags,char * ueid)186 static int smc_nl_ueid_dumpinfo(struct sk_buff *skb, u32 portid, u32 seq,
187 u32 flags, char *ueid)
188 {
189 char ueid_str[SMC_MAX_EID_LEN + 1];
190 void *hdr;
191
192 hdr = genlmsg_put(skb, portid, seq, &smc_gen_nl_family,
193 flags, SMC_NETLINK_DUMP_UEID);
194 if (!hdr)
195 return -ENOMEM;
196 memcpy(ueid_str, ueid, SMC_MAX_EID_LEN);
197 ueid_str[SMC_MAX_EID_LEN] = 0;
198 if (nla_put_string(skb, SMC_NLA_EID_TABLE_ENTRY, ueid_str)) {
199 genlmsg_cancel(skb, hdr);
200 return -EMSGSIZE;
201 }
202 genlmsg_end(skb, hdr);
203 return 0;
204 }
205
_smc_nl_ueid_dump(struct sk_buff * skb,u32 portid,u32 seq,int start_idx)206 static int _smc_nl_ueid_dump(struct sk_buff *skb, u32 portid, u32 seq,
207 int start_idx)
208 {
209 struct smc_clc_eid_entry *lst_ueid;
210 int idx = 0;
211
212 read_lock(&smc_clc_eid_table.lock);
213 list_for_each_entry(lst_ueid, &smc_clc_eid_table.list, list) {
214 if (idx++ < start_idx)
215 continue;
216 if (smc_nl_ueid_dumpinfo(skb, portid, seq, NLM_F_MULTI,
217 lst_ueid->eid)) {
218 --idx;
219 break;
220 }
221 }
222 read_unlock(&smc_clc_eid_table.lock);
223 return idx;
224 }
225
smc_nl_dump_ueid(struct sk_buff * skb,struct netlink_callback * cb)226 int smc_nl_dump_ueid(struct sk_buff *skb, struct netlink_callback *cb)
227 {
228 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
229 int idx;
230
231 idx = _smc_nl_ueid_dump(skb, NETLINK_CB(cb->skb).portid,
232 cb->nlh->nlmsg_seq, cb_ctx->pos[0]);
233
234 cb_ctx->pos[0] = idx;
235 return skb->len;
236 }
237
smc_nl_dump_seid(struct sk_buff * skb,struct netlink_callback * cb)238 int smc_nl_dump_seid(struct sk_buff *skb, struct netlink_callback *cb)
239 {
240 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
241 char seid_str[SMC_MAX_EID_LEN + 1];
242 u8 seid_enabled;
243 void *hdr;
244 u8 *seid;
245
246 if (cb_ctx->pos[0])
247 return skb->len;
248
249 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
250 &smc_gen_nl_family, NLM_F_MULTI,
251 SMC_NETLINK_DUMP_SEID);
252 if (!hdr)
253 return -ENOMEM;
254 if (!smc_ism_is_v2_capable())
255 goto end;
256
257 smc_ism_get_system_eid(&seid);
258 memcpy(seid_str, seid, SMC_MAX_EID_LEN);
259 seid_str[SMC_MAX_EID_LEN] = 0;
260 if (nla_put_string(skb, SMC_NLA_SEID_ENTRY, seid_str))
261 goto err;
262 read_lock(&smc_clc_eid_table.lock);
263 seid_enabled = smc_clc_eid_table.seid_enabled;
264 read_unlock(&smc_clc_eid_table.lock);
265 if (nla_put_u8(skb, SMC_NLA_SEID_ENABLED, seid_enabled))
266 goto err;
267 end:
268 genlmsg_end(skb, hdr);
269 cb_ctx->pos[0]++;
270 return skb->len;
271 err:
272 genlmsg_cancel(skb, hdr);
273 return -EMSGSIZE;
274 }
275
smc_nl_enable_seid(struct sk_buff * skb,struct genl_info * info)276 int smc_nl_enable_seid(struct sk_buff *skb, struct genl_info *info)
277 {
278 #if IS_ENABLED(CONFIG_S390)
279 write_lock(&smc_clc_eid_table.lock);
280 smc_clc_eid_table.seid_enabled = 1;
281 write_unlock(&smc_clc_eid_table.lock);
282 return 0;
283 #else
284 return -EOPNOTSUPP;
285 #endif
286 }
287
smc_nl_disable_seid(struct sk_buff * skb,struct genl_info * info)288 int smc_nl_disable_seid(struct sk_buff *skb, struct genl_info *info)
289 {
290 int rc = 0;
291
292 #if IS_ENABLED(CONFIG_S390)
293 write_lock(&smc_clc_eid_table.lock);
294 if (!smc_clc_eid_table.ueid_cnt)
295 rc = -ENOENT;
296 else
297 smc_clc_eid_table.seid_enabled = 0;
298 write_unlock(&smc_clc_eid_table.lock);
299 #else
300 rc = -EOPNOTSUPP;
301 #endif
302 return rc;
303 }
304
_smc_clc_match_ueid(u8 * peer_ueid)305 static bool _smc_clc_match_ueid(u8 *peer_ueid)
306 {
307 struct smc_clc_eid_entry *tmp_ueid;
308
309 list_for_each_entry(tmp_ueid, &smc_clc_eid_table.list, list) {
310 if (!memcmp(tmp_ueid->eid, peer_ueid, SMC_MAX_EID_LEN))
311 return true;
312 }
313 return false;
314 }
315
smc_clc_match_eid(u8 * negotiated_eid,struct smc_clc_v2_extension * smc_v2_ext,u8 * peer_eid,u8 * local_eid)316 bool smc_clc_match_eid(u8 *negotiated_eid,
317 struct smc_clc_v2_extension *smc_v2_ext,
318 u8 *peer_eid, u8 *local_eid)
319 {
320 bool match = false;
321 int i;
322
323 negotiated_eid[0] = 0;
324 read_lock(&smc_clc_eid_table.lock);
325 if (peer_eid && local_eid &&
326 smc_clc_eid_table.seid_enabled &&
327 smc_v2_ext->hdr.flag.seid &&
328 !memcmp(peer_eid, local_eid, SMC_MAX_EID_LEN)) {
329 memcpy(negotiated_eid, peer_eid, SMC_MAX_EID_LEN);
330 match = true;
331 goto out;
332 }
333
334 for (i = 0; i < smc_v2_ext->hdr.eid_cnt; i++) {
335 if (_smc_clc_match_ueid(smc_v2_ext->user_eids[i])) {
336 memcpy(negotiated_eid, smc_v2_ext->user_eids[i],
337 SMC_MAX_EID_LEN);
338 match = true;
339 goto out;
340 }
341 }
342 out:
343 read_unlock(&smc_clc_eid_table.lock);
344 return match;
345 }
346
347 /* check arriving CLC proposal */
smc_clc_msg_prop_valid(struct smc_clc_msg_proposal * pclc)348 static bool smc_clc_msg_prop_valid(struct smc_clc_msg_proposal *pclc)
349 {
350 struct smc_clc_msg_proposal_prefix *pclc_prfx;
351 struct smc_clc_smcd_v2_extension *smcd_v2_ext;
352 struct smc_clc_msg_hdr *hdr = &pclc->hdr;
353 struct smc_clc_v2_extension *v2_ext;
354
355 pclc_prfx = smc_clc_proposal_get_prefix(pclc);
356 if (!pclc_prfx ||
357 pclc_prfx->ipv6_prefixes_cnt > SMC_CLC_MAX_V6_PREFIX)
358 return false;
359
360 if (hdr->version == SMC_V1) {
361 if (hdr->typev1 == SMC_TYPE_N)
362 return false;
363 if (ntohs(hdr->length) !=
364 sizeof(*pclc) + ntohs(pclc->iparea_offset) +
365 sizeof(*pclc_prfx) +
366 pclc_prfx->ipv6_prefixes_cnt *
367 sizeof(struct smc_clc_ipv6_prefix) +
368 sizeof(struct smc_clc_msg_trail))
369 return false;
370 } else {
371 v2_ext = smc_get_clc_v2_ext(pclc);
372 if ((hdr->typev2 != SMC_TYPE_N &&
373 (!v2_ext || v2_ext->hdr.eid_cnt > SMC_CLC_MAX_UEID)) ||
374 (smcd_indicated(hdr->typev2) &&
375 v2_ext->hdr.ism_gid_cnt > SMCD_CLC_MAX_V2_GID_ENTRIES))
376 return false;
377
378 if (ntohs(hdr->length) !=
379 sizeof(*pclc) +
380 sizeof(struct smc_clc_msg_smcd) +
381 (hdr->typev1 != SMC_TYPE_N ?
382 sizeof(*pclc_prfx) +
383 pclc_prfx->ipv6_prefixes_cnt *
384 sizeof(struct smc_clc_ipv6_prefix) : 0) +
385 (hdr->typev2 != SMC_TYPE_N ?
386 sizeof(*v2_ext) +
387 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN : 0) +
388 (smcd_indicated(hdr->typev2) ?
389 sizeof(*smcd_v2_ext) + v2_ext->hdr.ism_gid_cnt *
390 sizeof(struct smc_clc_smcd_gid_chid) :
391 0) +
392 sizeof(struct smc_clc_msg_trail))
393 return false;
394 }
395 return true;
396 }
397
398 /* check arriving CLC accept or confirm */
399 static bool
smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm * clc)400 smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm *clc)
401 {
402 struct smc_clc_msg_hdr *hdr = &clc->hdr;
403
404 if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
405 return false;
406 if (hdr->version == SMC_V1) {
407 if ((hdr->typev1 == SMC_TYPE_R &&
408 ntohs(hdr->length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) ||
409 (hdr->typev1 == SMC_TYPE_D &&
410 ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN))
411 return false;
412 } else {
413 if (hdr->typev1 == SMC_TYPE_D &&
414 ntohs(hdr->length) < SMCD_CLC_ACCEPT_CONFIRM_LEN_V2)
415 return false;
416 if (hdr->typev1 == SMC_TYPE_R &&
417 ntohs(hdr->length) < SMCR_CLC_ACCEPT_CONFIRM_LEN_V2)
418 return false;
419 }
420 return true;
421 }
422
423 /* check arriving CLC decline */
424 static bool
smc_clc_msg_decl_valid(struct smc_clc_msg_decline * dclc)425 smc_clc_msg_decl_valid(struct smc_clc_msg_decline *dclc)
426 {
427 struct smc_clc_msg_hdr *hdr = &dclc->hdr;
428
429 if (hdr->version == SMC_V1) {
430 if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline))
431 return false;
432 } else {
433 if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline_v2))
434 return false;
435 }
436 return true;
437 }
438
smc_clc_fill_fce_v2x(struct smc_clc_first_contact_ext_v2x * fce_v2x,struct smc_init_info * ini)439 static int smc_clc_fill_fce_v2x(struct smc_clc_first_contact_ext_v2x *fce_v2x,
440 struct smc_init_info *ini)
441 {
442 int ret = sizeof(*fce_v2x);
443
444 memset(fce_v2x, 0, sizeof(*fce_v2x));
445 fce_v2x->fce_v2_base.os_type = SMC_CLC_OS_LINUX;
446 fce_v2x->fce_v2_base.release = ini->release_nr;
447 memcpy(fce_v2x->fce_v2_base.hostname,
448 smc_hostname, sizeof(smc_hostname));
449 if (ini->is_smcd && ini->release_nr < SMC_RELEASE_1) {
450 ret = sizeof(struct smc_clc_first_contact_ext);
451 goto out;
452 }
453
454 if (ini->release_nr >= SMC_RELEASE_1) {
455 if (!ini->is_smcd) {
456 fce_v2x->max_conns = ini->max_conns;
457 fce_v2x->max_links = ini->max_links;
458 }
459 fce_v2x->feature_mask = htons(ini->feature_mask);
460 }
461
462 out:
463 return ret;
464 }
465
466 /* check if received message has a correct header length and contains valid
467 * heading and trailing eyecatchers
468 */
smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr * clcm,bool check_trl)469 static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl)
470 {
471 struct smc_clc_msg_accept_confirm *clc;
472 struct smc_clc_msg_proposal *pclc;
473 struct smc_clc_msg_decline *dclc;
474 struct smc_clc_msg_trail *trl;
475
476 if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
477 memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
478 return false;
479 switch (clcm->type) {
480 case SMC_CLC_PROPOSAL:
481 pclc = (struct smc_clc_msg_proposal *)clcm;
482 if (!smc_clc_msg_prop_valid(pclc))
483 return false;
484 trl = (struct smc_clc_msg_trail *)
485 ((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl));
486 break;
487 case SMC_CLC_ACCEPT:
488 case SMC_CLC_CONFIRM:
489 clc = (struct smc_clc_msg_accept_confirm *)clcm;
490 if (!smc_clc_msg_acc_conf_valid(clc))
491 return false;
492 trl = (struct smc_clc_msg_trail *)
493 ((u8 *)clc + ntohs(clc->hdr.length) - sizeof(*trl));
494 break;
495 case SMC_CLC_DECLINE:
496 dclc = (struct smc_clc_msg_decline *)clcm;
497 if (!smc_clc_msg_decl_valid(dclc))
498 return false;
499 check_trl = false;
500 break;
501 default:
502 return false;
503 }
504 if (check_trl &&
505 memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
506 memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
507 return false;
508 return true;
509 }
510
511 /* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */
smc_clc_prfx_set4_rcu(struct dst_entry * dst,__be32 ipv4,struct smc_clc_msg_proposal_prefix * prop)512 static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4,
513 struct smc_clc_msg_proposal_prefix *prop)
514 {
515 struct in_device *in_dev = __in_dev_get_rcu(dst->dev);
516 const struct in_ifaddr *ifa;
517
518 if (!in_dev)
519 return -ENODEV;
520
521 in_dev_for_each_ifa_rcu(ifa, in_dev) {
522 if (!inet_ifa_match(ipv4, ifa))
523 continue;
524 prop->prefix_len = inet_mask_len(ifa->ifa_mask);
525 prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask;
526 /* prop->ipv6_prefixes_cnt = 0; already done by memset before */
527 return 0;
528 }
529 return -ENOENT;
530 }
531
532 /* fill CLC proposal msg with ipv6 prefixes from device */
smc_clc_prfx_set6_rcu(struct dst_entry * dst,struct smc_clc_msg_proposal_prefix * prop,struct smc_clc_ipv6_prefix * ipv6_prfx)533 static int smc_clc_prfx_set6_rcu(struct dst_entry *dst,
534 struct smc_clc_msg_proposal_prefix *prop,
535 struct smc_clc_ipv6_prefix *ipv6_prfx)
536 {
537 #if IS_ENABLED(CONFIG_IPV6)
538 struct inet6_dev *in6_dev = __in6_dev_get(dst->dev);
539 struct inet6_ifaddr *ifa;
540 int cnt = 0;
541
542 if (!in6_dev)
543 return -ENODEV;
544 /* use a maximum of 8 IPv6 prefixes from device */
545 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
546 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
547 continue;
548 ipv6_addr_prefix(&ipv6_prfx[cnt].prefix,
549 &ifa->addr, ifa->prefix_len);
550 ipv6_prfx[cnt].prefix_len = ifa->prefix_len;
551 cnt++;
552 if (cnt == SMC_CLC_MAX_V6_PREFIX)
553 break;
554 }
555 prop->ipv6_prefixes_cnt = cnt;
556 if (cnt)
557 return 0;
558 #endif
559 return -ENOENT;
560 }
561
562 /* retrieve and set prefixes in CLC proposal msg */
smc_clc_prfx_set(struct socket * clcsock,struct smc_clc_msg_proposal_prefix * prop,struct smc_clc_ipv6_prefix * ipv6_prfx)563 static int smc_clc_prfx_set(struct socket *clcsock,
564 struct smc_clc_msg_proposal_prefix *prop,
565 struct smc_clc_ipv6_prefix *ipv6_prfx)
566 {
567 struct dst_entry *dst = sk_dst_get(clcsock->sk);
568 struct sockaddr_storage addrs;
569 struct sockaddr_in6 *addr6;
570 struct sockaddr_in *addr;
571 int rc = -ENOENT;
572
573 if (!dst) {
574 rc = -ENOTCONN;
575 goto out;
576 }
577 if (!dst->dev) {
578 rc = -ENODEV;
579 goto out_rel;
580 }
581 /* get address to which the internal TCP socket is bound */
582 if (kernel_getsockname(clcsock, (struct sockaddr *)&addrs) < 0)
583 goto out_rel;
584 /* analyze IP specific data of net_device belonging to TCP socket */
585 addr6 = (struct sockaddr_in6 *)&addrs;
586 rcu_read_lock();
587 if (addrs.ss_family == PF_INET) {
588 /* IPv4 */
589 addr = (struct sockaddr_in *)&addrs;
590 rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop);
591 } else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) {
592 /* mapped IPv4 address - peer is IPv4 only */
593 rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3],
594 prop);
595 } else {
596 /* IPv6 */
597 rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx);
598 }
599 rcu_read_unlock();
600 out_rel:
601 dst_release(dst);
602 out:
603 return rc;
604 }
605
606 /* match ipv4 addrs of dev against addr in CLC proposal */
smc_clc_prfx_match4_rcu(struct net_device * dev,struct smc_clc_msg_proposal_prefix * prop)607 static int smc_clc_prfx_match4_rcu(struct net_device *dev,
608 struct smc_clc_msg_proposal_prefix *prop)
609 {
610 struct in_device *in_dev = __in_dev_get_rcu(dev);
611 const struct in_ifaddr *ifa;
612
613 if (!in_dev)
614 return -ENODEV;
615 in_dev_for_each_ifa_rcu(ifa, in_dev) {
616 if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) &&
617 inet_ifa_match(prop->outgoing_subnet, ifa))
618 return 0;
619 }
620
621 return -ENOENT;
622 }
623
624 /* match ipv6 addrs of dev against addrs in CLC proposal */
smc_clc_prfx_match6_rcu(struct net_device * dev,struct smc_clc_msg_proposal_prefix * prop)625 static int smc_clc_prfx_match6_rcu(struct net_device *dev,
626 struct smc_clc_msg_proposal_prefix *prop)
627 {
628 #if IS_ENABLED(CONFIG_IPV6)
629 struct inet6_dev *in6_dev = __in6_dev_get(dev);
630 struct smc_clc_ipv6_prefix *ipv6_prfx;
631 struct inet6_ifaddr *ifa;
632 int i, max;
633
634 if (!in6_dev)
635 return -ENODEV;
636 /* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */
637 ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop));
638 max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX);
639 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
640 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
641 continue;
642 for (i = 0; i < max; i++) {
643 if (ifa->prefix_len == ipv6_prfx[i].prefix_len &&
644 ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix,
645 ifa->prefix_len))
646 return 0;
647 }
648 }
649 #endif
650 return -ENOENT;
651 }
652
653 /* check if proposed prefixes match one of our device prefixes */
smc_clc_prfx_match(struct socket * clcsock,struct smc_clc_msg_proposal_prefix * prop)654 int smc_clc_prfx_match(struct socket *clcsock,
655 struct smc_clc_msg_proposal_prefix *prop)
656 {
657 struct dst_entry *dst = sk_dst_get(clcsock->sk);
658 int rc;
659
660 if (!dst) {
661 rc = -ENOTCONN;
662 goto out;
663 }
664 if (!dst->dev) {
665 rc = -ENODEV;
666 goto out_rel;
667 }
668 rcu_read_lock();
669 if (!prop->ipv6_prefixes_cnt)
670 rc = smc_clc_prfx_match4_rcu(dst->dev, prop);
671 else
672 rc = smc_clc_prfx_match6_rcu(dst->dev, prop);
673 rcu_read_unlock();
674 out_rel:
675 dst_release(dst);
676 out:
677 return rc;
678 }
679
680 /* Wait for data on the tcp-socket, analyze received data
681 * Returns:
682 * 0 if success and it was not a decline that we received.
683 * SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send.
684 * clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise.
685 */
smc_clc_wait_msg(struct smc_sock * smc,void * buf,int buflen,u8 expected_type,unsigned long timeout)686 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
687 u8 expected_type, unsigned long timeout)
688 {
689 long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo;
690 struct sock *clc_sk = smc->clcsock->sk;
691 struct smc_clc_msg_hdr *clcm = buf;
692 struct msghdr msg = {NULL, 0};
693 int reason_code = 0;
694 struct kvec vec = {buf, buflen};
695 int len, datlen, recvlen;
696 bool check_trl = true;
697 int krflags;
698
699 /* peek the first few bytes to determine length of data to receive
700 * so we don't consume any subsequent CLC message or payload data
701 * in the TCP byte stream
702 */
703 /*
704 * Caller must make sure that buflen is no less than
705 * sizeof(struct smc_clc_msg_hdr)
706 */
707 krflags = MSG_PEEK | MSG_WAITALL;
708 clc_sk->sk_rcvtimeo = timeout;
709 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1,
710 sizeof(struct smc_clc_msg_hdr));
711 len = sock_recvmsg(smc->clcsock, &msg, krflags);
712 if (signal_pending(current)) {
713 reason_code = -EINTR;
714 clc_sk->sk_err = EINTR;
715 smc->sk.sk_err = EINTR;
716 goto out;
717 }
718 if (clc_sk->sk_err) {
719 reason_code = -clc_sk->sk_err;
720 if (clc_sk->sk_err == EAGAIN &&
721 expected_type == SMC_CLC_DECLINE)
722 clc_sk->sk_err = 0; /* reset for fallback usage */
723 else
724 smc->sk.sk_err = clc_sk->sk_err;
725 goto out;
726 }
727 if (!len) { /* peer has performed orderly shutdown */
728 smc->sk.sk_err = ECONNRESET;
729 reason_code = -ECONNRESET;
730 goto out;
731 }
732 if (len < 0) {
733 if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE)
734 smc->sk.sk_err = -len;
735 reason_code = len;
736 goto out;
737 }
738 datlen = ntohs(clcm->length);
739 if ((len < sizeof(struct smc_clc_msg_hdr)) ||
740 (clcm->version < SMC_V1) ||
741 ((clcm->type != SMC_CLC_DECLINE) &&
742 (clcm->type != expected_type))) {
743 smc->sk.sk_err = EPROTO;
744 reason_code = -EPROTO;
745 goto out;
746 }
747
748 /* receive the complete CLC message */
749 memset(&msg, 0, sizeof(struct msghdr));
750 if (datlen > buflen) {
751 check_trl = false;
752 recvlen = buflen;
753 } else {
754 recvlen = datlen;
755 }
756 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
757 krflags = MSG_WAITALL;
758 len = sock_recvmsg(smc->clcsock, &msg, krflags);
759 if (len < recvlen || !smc_clc_msg_hdr_valid(clcm, check_trl)) {
760 smc->sk.sk_err = EPROTO;
761 reason_code = -EPROTO;
762 goto out;
763 }
764 datlen -= len;
765 while (datlen) {
766 u8 tmp[SMC_CLC_RECV_BUF_LEN];
767
768 vec.iov_base = &tmp;
769 vec.iov_len = SMC_CLC_RECV_BUF_LEN;
770 /* receive remaining proposal message */
771 recvlen = datlen > SMC_CLC_RECV_BUF_LEN ?
772 SMC_CLC_RECV_BUF_LEN : datlen;
773 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
774 len = sock_recvmsg(smc->clcsock, &msg, krflags);
775 if (len < recvlen) {
776 smc->sk.sk_err = EPROTO;
777 reason_code = -EPROTO;
778 goto out;
779 }
780 datlen -= len;
781 }
782 if (clcm->type == SMC_CLC_DECLINE) {
783 struct smc_clc_msg_decline *dclc;
784
785 dclc = (struct smc_clc_msg_decline *)clcm;
786 reason_code = SMC_CLC_DECL_PEERDECL;
787 smc->peer_diagnosis = ntohl(dclc->peer_diagnosis);
788 if (((struct smc_clc_msg_decline *)buf)->hdr.typev2 &
789 SMC_FIRST_CONTACT_MASK) {
790 smc->conn.lgr->sync_err = 1;
791 smc_lgr_terminate_sched(smc->conn.lgr);
792 }
793 }
794
795 out:
796 clc_sk->sk_rcvtimeo = rcvtimeo;
797 return reason_code;
798 }
799
800 /* send CLC DECLINE message across internal TCP socket */
smc_clc_send_decline(struct smc_sock * smc,u32 peer_diag_info,u8 version)801 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version)
802 {
803 struct smc_clc_msg_decline *dclc_v1;
804 struct smc_clc_msg_decline_v2 dclc;
805 struct msghdr msg;
806 int len, send_len;
807 struct kvec vec;
808
809 dclc_v1 = (struct smc_clc_msg_decline *)&dclc;
810 memset(&dclc, 0, sizeof(dclc));
811 memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
812 dclc.hdr.type = SMC_CLC_DECLINE;
813 dclc.hdr.version = version;
814 dclc.os_type = version == SMC_V1 ? 0 : SMC_CLC_OS_LINUX;
815 dclc.hdr.typev2 = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ?
816 SMC_FIRST_CONTACT_MASK : 0;
817 if ((!smc_conn_lgr_valid(&smc->conn) || !smc->conn.lgr->is_smcd) &&
818 smc_ib_is_valid_local_systemid())
819 memcpy(dclc.id_for_peer, local_systemid,
820 sizeof(local_systemid));
821 dclc.peer_diagnosis = htonl(peer_diag_info);
822 if (version == SMC_V1) {
823 memcpy(dclc_v1->trl.eyecatcher, SMC_EYECATCHER,
824 sizeof(SMC_EYECATCHER));
825 send_len = sizeof(*dclc_v1);
826 } else {
827 memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER,
828 sizeof(SMC_EYECATCHER));
829 send_len = sizeof(dclc);
830 }
831 dclc.hdr.length = htons(send_len);
832
833 memset(&msg, 0, sizeof(msg));
834 vec.iov_base = &dclc;
835 vec.iov_len = send_len;
836 len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, send_len);
837 if (len < 0 || len < send_len)
838 len = -EPROTO;
839 return len > 0 ? 0 : len;
840 }
841
842 /* send CLC PROPOSAL message across internal TCP socket */
smc_clc_send_proposal(struct smc_sock * smc,struct smc_init_info * ini)843 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini)
844 {
845 struct smc_clc_smcd_v2_extension *smcd_v2_ext;
846 struct smc_clc_msg_proposal_prefix *pclc_prfx;
847 struct smc_clc_msg_proposal *pclc_base;
848 struct smc_clc_smcd_gid_chid *gidchids;
849 struct smc_clc_msg_proposal_area *pclc;
850 struct smc_clc_ipv6_prefix *ipv6_prfx;
851 struct net *net = sock_net(&smc->sk);
852 struct smc_clc_v2_extension *v2_ext;
853 struct smc_clc_msg_smcd *pclc_smcd;
854 struct smc_clc_msg_trail *trl;
855 struct smcd_dev *smcd;
856 int len, i, plen, rc;
857 int reason_code = 0;
858 struct kvec vec[8];
859 struct msghdr msg;
860
861 pclc = kzalloc(sizeof(*pclc), GFP_KERNEL);
862 if (!pclc)
863 return -ENOMEM;
864
865 pclc_base = &pclc->pclc_base;
866 pclc_smcd = &pclc->pclc_smcd;
867 pclc_prfx = &pclc->pclc_prfx;
868 ipv6_prfx = pclc->pclc_prfx_ipv6;
869 v2_ext = container_of(&pclc->pclc_v2_ext,
870 struct smc_clc_v2_extension, fixed);
871 smcd_v2_ext = container_of(&pclc->pclc_smcd_v2_ext,
872 struct smc_clc_smcd_v2_extension, fixed);
873 gidchids = pclc->pclc_gidchids;
874 trl = &pclc->pclc_trl;
875
876 pclc_base->hdr.version = SMC_V2;
877 pclc_base->hdr.typev1 = ini->smc_type_v1;
878 pclc_base->hdr.typev2 = ini->smc_type_v2;
879 plen = sizeof(*pclc_base) + sizeof(*pclc_smcd) + sizeof(*trl);
880
881 /* retrieve ip prefixes for CLC proposal msg */
882 if (ini->smc_type_v1 != SMC_TYPE_N) {
883 rc = smc_clc_prfx_set(smc->clcsock, pclc_prfx, ipv6_prfx);
884 if (rc) {
885 if (ini->smc_type_v2 == SMC_TYPE_N) {
886 kfree(pclc);
887 return SMC_CLC_DECL_CNFERR;
888 }
889 pclc_base->hdr.typev1 = SMC_TYPE_N;
890 } else {
891 pclc_base->iparea_offset = htons(sizeof(*pclc_smcd));
892 plen += sizeof(*pclc_prfx) +
893 pclc_prfx->ipv6_prefixes_cnt *
894 sizeof(ipv6_prfx[0]);
895 }
896 }
897
898 /* build SMC Proposal CLC message */
899 memcpy(pclc_base->hdr.eyecatcher, SMC_EYECATCHER,
900 sizeof(SMC_EYECATCHER));
901 pclc_base->hdr.type = SMC_CLC_PROPOSAL;
902 if (smcr_indicated(ini->smc_type_v1)) {
903 /* add SMC-R specifics */
904 memcpy(pclc_base->lcl.id_for_peer, local_systemid,
905 sizeof(local_systemid));
906 memcpy(pclc_base->lcl.gid, ini->ib_gid, SMC_GID_SIZE);
907 memcpy(pclc_base->lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1],
908 ETH_ALEN);
909 }
910 if (smcd_indicated(ini->smc_type_v1)) {
911 struct smcd_gid smcd_gid;
912
913 /* add SMC-D specifics */
914 if (ini->ism_dev[0]) {
915 smcd = ini->ism_dev[0];
916 smcd->ops->get_local_gid(smcd, &smcd_gid);
917 pclc_smcd->ism.gid = htonll(smcd_gid.gid);
918 pclc_smcd->ism.chid =
919 htons(smc_ism_get_chid(ini->ism_dev[0]));
920 }
921 }
922 if (ini->smc_type_v2 == SMC_TYPE_N) {
923 pclc_smcd->v2_ext_offset = 0;
924 } else {
925 struct smc_clc_eid_entry *ueident;
926 u16 v2_ext_offset;
927
928 v2_ext->hdr.flag.release = SMC_RELEASE;
929 v2_ext_offset = sizeof(*pclc_smcd) -
930 offsetofend(struct smc_clc_msg_smcd, v2_ext_offset);
931 if (ini->smc_type_v1 != SMC_TYPE_N)
932 v2_ext_offset += sizeof(*pclc_prfx) +
933 pclc_prfx->ipv6_prefixes_cnt *
934 sizeof(ipv6_prfx[0]);
935 pclc_smcd->v2_ext_offset = htons(v2_ext_offset);
936 plen += sizeof(*v2_ext);
937
938 v2_ext->feature_mask = htons(SMC_FEATURE_MASK);
939 read_lock(&smc_clc_eid_table.lock);
940 v2_ext->hdr.eid_cnt = smc_clc_eid_table.ueid_cnt;
941 plen += smc_clc_eid_table.ueid_cnt * SMC_MAX_EID_LEN;
942 i = 0;
943 list_for_each_entry(ueident, &smc_clc_eid_table.list, list) {
944 memcpy(v2_ext->user_eids[i++], ueident->eid,
945 sizeof(ueident->eid));
946 }
947 read_unlock(&smc_clc_eid_table.lock);
948 }
949 if (smcd_indicated(ini->smc_type_v2)) {
950 struct smcd_gid smcd_gid;
951 u8 *eid = NULL;
952 int entry = 0;
953
954 v2_ext->hdr.flag.seid = smc_clc_eid_table.seid_enabled;
955 v2_ext->hdr.smcd_v2_ext_offset = htons(sizeof(*v2_ext) -
956 offsetofend(struct smc_clnt_opts_area_hdr,
957 smcd_v2_ext_offset) +
958 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);
959 smc_ism_get_system_eid(&eid);
960 if (eid && v2_ext->hdr.flag.seid)
961 memcpy(smcd_v2_ext->system_eid, eid, SMC_MAX_EID_LEN);
962 plen += sizeof(*smcd_v2_ext);
963 if (ini->ism_offered_cnt) {
964 for (i = 1; i <= ini->ism_offered_cnt; i++) {
965 smcd = ini->ism_dev[i];
966 smcd->ops->get_local_gid(smcd, &smcd_gid);
967 gidchids[entry].chid =
968 htons(smc_ism_get_chid(ini->ism_dev[i]));
969 gidchids[entry].gid = htonll(smcd_gid.gid);
970 if (smc_ism_is_emulated(smcd)) {
971 /* an Emulated-ISM device takes two
972 * entries. CHID of the second entry
973 * repeats that of the first entry.
974 */
975 gidchids[entry + 1].chid =
976 gidchids[entry].chid;
977 gidchids[entry + 1].gid =
978 htonll(smcd_gid.gid_ext);
979 entry++;
980 }
981 entry++;
982 }
983 plen += entry * sizeof(struct smc_clc_smcd_gid_chid);
984 }
985 v2_ext->hdr.ism_gid_cnt = entry;
986 }
987 if (smcr_indicated(ini->smc_type_v2)) {
988 memcpy(v2_ext->roce, ini->smcrv2.ib_gid_v2, SMC_GID_SIZE);
989 v2_ext->max_conns = net->smc.sysctl_max_conns_per_lgr;
990 v2_ext->max_links = net->smc.sysctl_max_links_per_lgr;
991 }
992
993 pclc_base->hdr.length = htons(plen);
994 memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
995
996 /* send SMC Proposal CLC message */
997 memset(&msg, 0, sizeof(msg));
998 i = 0;
999 vec[i].iov_base = pclc_base;
1000 vec[i++].iov_len = sizeof(*pclc_base);
1001 vec[i].iov_base = pclc_smcd;
1002 vec[i++].iov_len = sizeof(*pclc_smcd);
1003 if (ini->smc_type_v1 != SMC_TYPE_N) {
1004 vec[i].iov_base = pclc_prfx;
1005 vec[i++].iov_len = sizeof(*pclc_prfx);
1006 if (pclc_prfx->ipv6_prefixes_cnt > 0) {
1007 vec[i].iov_base = ipv6_prfx;
1008 vec[i++].iov_len = pclc_prfx->ipv6_prefixes_cnt *
1009 sizeof(ipv6_prfx[0]);
1010 }
1011 }
1012 if (ini->smc_type_v2 != SMC_TYPE_N) {
1013 vec[i].iov_base = v2_ext;
1014 vec[i++].iov_len = sizeof(*v2_ext) +
1015 (v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);
1016 if (smcd_indicated(ini->smc_type_v2)) {
1017 vec[i].iov_base = smcd_v2_ext;
1018 vec[i++].iov_len = sizeof(*smcd_v2_ext);
1019 if (ini->ism_offered_cnt) {
1020 vec[i].iov_base = gidchids;
1021 vec[i++].iov_len = v2_ext->hdr.ism_gid_cnt *
1022 sizeof(struct smc_clc_smcd_gid_chid);
1023 }
1024 }
1025 }
1026 vec[i].iov_base = trl;
1027 vec[i++].iov_len = sizeof(*trl);
1028 /* due to the few bytes needed for clc-handshake this cannot block */
1029 len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen);
1030 if (len < 0) {
1031 smc->sk.sk_err = smc->clcsock->sk->sk_err;
1032 reason_code = -smc->sk.sk_err;
1033 } else if (len < ntohs(pclc_base->hdr.length)) {
1034 reason_code = -ENETUNREACH;
1035 smc->sk.sk_err = -reason_code;
1036 }
1037
1038 kfree(pclc);
1039 return reason_code;
1040 }
1041
1042 static void
smcd_clc_prep_confirm_accept(struct smc_connection * conn,struct smc_clc_msg_accept_confirm * clc,int first_contact,u8 version,u8 * eid,struct smc_init_info * ini,int * fce_len,struct smc_clc_first_contact_ext_v2x * fce_v2x,struct smc_clc_msg_trail * trl)1043 smcd_clc_prep_confirm_accept(struct smc_connection *conn,
1044 struct smc_clc_msg_accept_confirm *clc,
1045 int first_contact, u8 version,
1046 u8 *eid, struct smc_init_info *ini,
1047 int *fce_len,
1048 struct smc_clc_first_contact_ext_v2x *fce_v2x,
1049 struct smc_clc_msg_trail *trl)
1050 {
1051 struct smcd_dev *smcd = conn->lgr->smcd;
1052 struct smcd_gid smcd_gid;
1053 u16 chid;
1054 int len;
1055
1056 /* SMC-D specific settings */
1057 memcpy(clc->hdr.eyecatcher, SMCD_EYECATCHER,
1058 sizeof(SMCD_EYECATCHER));
1059 smcd->ops->get_local_gid(smcd, &smcd_gid);
1060 clc->hdr.typev1 = SMC_TYPE_D;
1061 clc->d0.gid = htonll(smcd_gid.gid);
1062 clc->d0.token = htonll(conn->rmb_desc->token);
1063 clc->d0.dmbe_size = conn->rmbe_size_comp;
1064 clc->d0.dmbe_idx = 0;
1065 memcpy(&clc->d0.linkid, conn->lgr->id, SMC_LGR_ID_SIZE);
1066 if (version == SMC_V1) {
1067 clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
1068 } else {
1069 chid = smc_ism_get_chid(smcd);
1070 clc->d1.chid = htons(chid);
1071 if (eid && eid[0])
1072 memcpy(clc->d1.eid, eid, SMC_MAX_EID_LEN);
1073 if (__smc_ism_is_emulated(chid))
1074 clc->d1.gid_ext = htonll(smcd_gid.gid_ext);
1075 len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2;
1076 if (first_contact) {
1077 *fce_len = smc_clc_fill_fce_v2x(fce_v2x, ini);
1078 len += *fce_len;
1079 }
1080 clc->hdr.length = htons(len);
1081 }
1082 memcpy(trl->eyecatcher, SMCD_EYECATCHER,
1083 sizeof(SMCD_EYECATCHER));
1084 }
1085
1086 static void
smcr_clc_prep_confirm_accept(struct smc_connection * conn,struct smc_clc_msg_accept_confirm * clc,int first_contact,u8 version,u8 * eid,struct smc_init_info * ini,int * fce_len,struct smc_clc_first_contact_ext_v2x * fce_v2x,struct smc_clc_fce_gid_ext * gle,struct smc_clc_msg_trail * trl)1087 smcr_clc_prep_confirm_accept(struct smc_connection *conn,
1088 struct smc_clc_msg_accept_confirm *clc,
1089 int first_contact, u8 version,
1090 u8 *eid, struct smc_init_info *ini,
1091 int *fce_len,
1092 struct smc_clc_first_contact_ext_v2x *fce_v2x,
1093 struct smc_clc_fce_gid_ext *gle,
1094 struct smc_clc_msg_trail *trl)
1095 {
1096 struct smc_link *link = conn->lnk;
1097 int len;
1098
1099 /* SMC-R specific settings */
1100 memcpy(clc->hdr.eyecatcher, SMC_EYECATCHER,
1101 sizeof(SMC_EYECATCHER));
1102 clc->hdr.typev1 = SMC_TYPE_R;
1103 memcpy(clc->r0.lcl.id_for_peer, local_systemid,
1104 sizeof(local_systemid));
1105 memcpy(&clc->r0.lcl.gid, link->gid, SMC_GID_SIZE);
1106 memcpy(&clc->r0.lcl.mac, &link->smcibdev->mac[link->ibport - 1],
1107 ETH_ALEN);
1108 hton24(clc->r0.qpn, link->roce_qp->qp_num);
1109 clc->r0.rmb_rkey =
1110 htonl(conn->rmb_desc->mr[link->link_idx]->rkey);
1111 clc->r0.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */
1112 clc->r0.rmbe_alert_token = htonl(conn->alert_token_local);
1113 switch (clc->hdr.type) {
1114 case SMC_CLC_ACCEPT:
1115 clc->r0.qp_mtu = link->path_mtu;
1116 break;
1117 case SMC_CLC_CONFIRM:
1118 clc->r0.qp_mtu = min(link->path_mtu, link->peer_mtu);
1119 break;
1120 }
1121 clc->r0.rmbe_size = conn->rmbe_size_comp;
1122 clc->r0.rmb_dma_addr = conn->rmb_desc->is_vm ?
1123 cpu_to_be64((uintptr_t)conn->rmb_desc->cpu_addr) :
1124 cpu_to_be64((u64)sg_dma_address
1125 (conn->rmb_desc->sgt[link->link_idx].sgl));
1126 hton24(clc->r0.psn, link->psn_initial);
1127 if (version == SMC_V1) {
1128 clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
1129 } else {
1130 if (eid && eid[0])
1131 memcpy(clc->r1.eid, eid, SMC_MAX_EID_LEN);
1132 len = SMCR_CLC_ACCEPT_CONFIRM_LEN_V2;
1133 if (first_contact) {
1134 *fce_len = smc_clc_fill_fce_v2x(fce_v2x, ini);
1135 len += *fce_len;
1136 fce_v2x->fce_v2_base.v2_direct =
1137 !link->lgr->uses_gateway;
1138 if (clc->hdr.type == SMC_CLC_CONFIRM) {
1139 memset(gle, 0, sizeof(*gle));
1140 gle->gid_cnt = ini->smcrv2.gidlist.len;
1141 len += sizeof(*gle);
1142 len += gle->gid_cnt * sizeof(gle->gid[0]);
1143 }
1144 }
1145 clc->hdr.length = htons(len);
1146 }
1147 memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
1148 }
1149
1150 /* build and send CLC CONFIRM / ACCEPT message */
smc_clc_send_confirm_accept(struct smc_sock * smc,struct smc_clc_msg_accept_confirm * clc,int first_contact,u8 version,u8 * eid,struct smc_init_info * ini)1151 static int smc_clc_send_confirm_accept(struct smc_sock *smc,
1152 struct smc_clc_msg_accept_confirm *clc,
1153 int first_contact, u8 version,
1154 u8 *eid, struct smc_init_info *ini)
1155 {
1156 struct smc_clc_first_contact_ext_v2x fce_v2x;
1157 struct smc_connection *conn = &smc->conn;
1158 struct smc_clc_fce_gid_ext gle;
1159 struct smc_clc_msg_trail trl;
1160 int i, fce_len;
1161 struct kvec vec[5];
1162 struct msghdr msg;
1163
1164 /* send SMC Confirm CLC msg */
1165 clc->hdr.version = version; /* SMC version */
1166 if (first_contact)
1167 clc->hdr.typev2 |= SMC_FIRST_CONTACT_MASK;
1168 if (conn->lgr->is_smcd)
1169 smcd_clc_prep_confirm_accept(conn, clc, first_contact,
1170 version, eid, ini, &fce_len,
1171 &fce_v2x, &trl);
1172 else
1173 smcr_clc_prep_confirm_accept(conn, clc, first_contact,
1174 version, eid, ini, &fce_len,
1175 &fce_v2x, &gle, &trl);
1176 memset(&msg, 0, sizeof(msg));
1177 i = 0;
1178 vec[i].iov_base = clc;
1179 if (version > SMC_V1)
1180 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ?
1181 SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 :
1182 SMCR_CLC_ACCEPT_CONFIRM_LEN_V2) -
1183 sizeof(trl);
1184 else
1185 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ?
1186 SMCD_CLC_ACCEPT_CONFIRM_LEN :
1187 SMCR_CLC_ACCEPT_CONFIRM_LEN) -
1188 sizeof(trl);
1189 if (version > SMC_V1 && first_contact) {
1190 vec[i].iov_base = &fce_v2x;
1191 vec[i++].iov_len = fce_len;
1192 if (!conn->lgr->is_smcd) {
1193 if (clc->hdr.type == SMC_CLC_CONFIRM) {
1194 vec[i].iov_base = &gle;
1195 vec[i++].iov_len = sizeof(gle);
1196 vec[i].iov_base = &ini->smcrv2.gidlist.list;
1197 vec[i++].iov_len = gle.gid_cnt *
1198 sizeof(gle.gid[0]);
1199 }
1200 }
1201 }
1202 vec[i].iov_base = &trl;
1203 vec[i++].iov_len = sizeof(trl);
1204 return kernel_sendmsg(smc->clcsock, &msg, vec, 1,
1205 ntohs(clc->hdr.length));
1206 }
1207
1208 /* send CLC CONFIRM message across internal TCP socket */
smc_clc_send_confirm(struct smc_sock * smc,bool clnt_first_contact,u8 version,u8 * eid,struct smc_init_info * ini)1209 int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
1210 u8 version, u8 *eid, struct smc_init_info *ini)
1211 {
1212 struct smc_clc_msg_accept_confirm cclc;
1213 int reason_code = 0;
1214 int len;
1215
1216 /* send SMC Confirm CLC msg */
1217 memset(&cclc, 0, sizeof(cclc));
1218 cclc.hdr.type = SMC_CLC_CONFIRM;
1219 len = smc_clc_send_confirm_accept(smc, &cclc, clnt_first_contact,
1220 version, eid, ini);
1221 if (len < ntohs(cclc.hdr.length)) {
1222 if (len >= 0) {
1223 reason_code = -ENETUNREACH;
1224 smc->sk.sk_err = -reason_code;
1225 } else {
1226 smc->sk.sk_err = smc->clcsock->sk->sk_err;
1227 reason_code = -smc->sk.sk_err;
1228 }
1229 }
1230 return reason_code;
1231 }
1232
1233 /* send CLC ACCEPT message across internal TCP socket */
smc_clc_send_accept(struct smc_sock * new_smc,bool srv_first_contact,u8 version,u8 * negotiated_eid,struct smc_init_info * ini)1234 int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact,
1235 u8 version, u8 *negotiated_eid, struct smc_init_info *ini)
1236 {
1237 struct smc_clc_msg_accept_confirm aclc;
1238 int len;
1239
1240 memset(&aclc, 0, sizeof(aclc));
1241 aclc.hdr.type = SMC_CLC_ACCEPT;
1242 len = smc_clc_send_confirm_accept(new_smc, &aclc, srv_first_contact,
1243 version, negotiated_eid, ini);
1244 if (len < ntohs(aclc.hdr.length))
1245 len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err;
1246
1247 return len > 0 ? 0 : len;
1248 }
1249
smc_clc_srv_v2x_features_validate(struct smc_sock * smc,struct smc_clc_msg_proposal * pclc,struct smc_init_info * ini)1250 int smc_clc_srv_v2x_features_validate(struct smc_sock *smc,
1251 struct smc_clc_msg_proposal *pclc,
1252 struct smc_init_info *ini)
1253 {
1254 struct smc_clc_v2_extension *pclc_v2_ext;
1255 struct net *net = sock_net(&smc->sk);
1256
1257 ini->max_conns = SMC_CONN_PER_LGR_MAX;
1258 ini->max_links = SMC_LINKS_ADD_LNK_MAX;
1259 ini->feature_mask = SMC_FEATURE_MASK;
1260
1261 if ((!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) ||
1262 ini->release_nr < SMC_RELEASE_1)
1263 return 0;
1264
1265 pclc_v2_ext = smc_get_clc_v2_ext(pclc);
1266 if (!pclc_v2_ext)
1267 return SMC_CLC_DECL_NOV2EXT;
1268
1269 if (ini->smcr_version & SMC_V2) {
1270 ini->max_conns = min_t(u8, pclc_v2_ext->max_conns,
1271 net->smc.sysctl_max_conns_per_lgr);
1272 if (ini->max_conns < SMC_CONN_PER_LGR_MIN)
1273 return SMC_CLC_DECL_MAXCONNERR;
1274
1275 ini->max_links = min_t(u8, pclc_v2_ext->max_links,
1276 net->smc.sysctl_max_links_per_lgr);
1277 if (ini->max_links < SMC_LINKS_ADD_LNK_MIN)
1278 return SMC_CLC_DECL_MAXLINKERR;
1279 }
1280
1281 return 0;
1282 }
1283
smc_clc_clnt_v2x_features_validate(struct smc_clc_first_contact_ext * fce,struct smc_init_info * ini)1284 int smc_clc_clnt_v2x_features_validate(struct smc_clc_first_contact_ext *fce,
1285 struct smc_init_info *ini)
1286 {
1287 struct smc_clc_first_contact_ext_v2x *fce_v2x =
1288 (struct smc_clc_first_contact_ext_v2x *)fce;
1289
1290 if (ini->release_nr < SMC_RELEASE_1)
1291 return 0;
1292
1293 if (!ini->is_smcd) {
1294 if (fce_v2x->max_conns < SMC_CONN_PER_LGR_MIN)
1295 return SMC_CLC_DECL_MAXCONNERR;
1296 ini->max_conns = fce_v2x->max_conns;
1297
1298 if (fce_v2x->max_links > SMC_LINKS_ADD_LNK_MAX ||
1299 fce_v2x->max_links < SMC_LINKS_ADD_LNK_MIN)
1300 return SMC_CLC_DECL_MAXLINKERR;
1301 ini->max_links = fce_v2x->max_links;
1302 }
1303 /* common supplemental features of server and client */
1304 ini->feature_mask = ntohs(fce_v2x->feature_mask) & SMC_FEATURE_MASK;
1305
1306 return 0;
1307 }
1308
smc_clc_v2x_features_confirm_check(struct smc_clc_msg_accept_confirm * cclc,struct smc_init_info * ini)1309 int smc_clc_v2x_features_confirm_check(struct smc_clc_msg_accept_confirm *cclc,
1310 struct smc_init_info *ini)
1311 {
1312 struct smc_clc_first_contact_ext *fce =
1313 smc_get_clc_first_contact_ext(cclc, ini->is_smcd);
1314 struct smc_clc_first_contact_ext_v2x *fce_v2x =
1315 (struct smc_clc_first_contact_ext_v2x *)fce;
1316
1317 if (cclc->hdr.version == SMC_V1 ||
1318 !(cclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
1319 return 0;
1320
1321 if (ini->release_nr != fce->release)
1322 return SMC_CLC_DECL_RELEASEERR;
1323
1324 if (fce->release < SMC_RELEASE_1)
1325 return 0;
1326
1327 if (!ini->is_smcd) {
1328 if (fce_v2x->max_conns != ini->max_conns)
1329 return SMC_CLC_DECL_MAXCONNERR;
1330 if (fce_v2x->max_links != ini->max_links)
1331 return SMC_CLC_DECL_MAXLINKERR;
1332 }
1333 /* common supplemental features returned by client */
1334 ini->feature_mask = ntohs(fce_v2x->feature_mask);
1335
1336 return 0;
1337 }
1338
smc_clc_get_hostname(u8 ** host)1339 void smc_clc_get_hostname(u8 **host)
1340 {
1341 *host = &smc_hostname[0];
1342 }
1343
smc_clc_init(void)1344 void __init smc_clc_init(void)
1345 {
1346 struct new_utsname *u;
1347
1348 memset(smc_hostname, _S, sizeof(smc_hostname)); /* ASCII blanks */
1349 u = utsname();
1350 memcpy(smc_hostname, u->nodename,
1351 min_t(size_t, strlen(u->nodename), sizeof(smc_hostname)));
1352
1353 INIT_LIST_HEAD(&smc_clc_eid_table.list);
1354 rwlock_init(&smc_clc_eid_table.lock);
1355 smc_clc_eid_table.ueid_cnt = 0;
1356 #if IS_ENABLED(CONFIG_S390)
1357 smc_clc_eid_table.seid_enabled = 1;
1358 #else
1359 smc_clc_eid_table.seid_enabled = 0;
1360 #endif
1361 }
1362
smc_clc_exit(void)1363 void smc_clc_exit(void)
1364 {
1365 smc_clc_ueid_remove(NULL);
1366 }
1367