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 (!rc && !smc_clc_eid_table.ueid_cnt) {
159 smc_clc_eid_table.seid_enabled = 1;
160 rc = -EAGAIN; /* indicate success and enabling of seid */
161 }
162 write_unlock(&smc_clc_eid_table.lock);
163 return rc;
164 }
165
smc_nl_remove_ueid(struct sk_buff * skb,struct genl_info * info)166 int smc_nl_remove_ueid(struct sk_buff *skb, struct genl_info *info)
167 {
168 struct nlattr *nla_ueid = info->attrs[SMC_NLA_EID_TABLE_ENTRY];
169 char *ueid;
170
171 if (!nla_ueid || nla_len(nla_ueid) != SMC_MAX_EID_LEN + 1)
172 return -EINVAL;
173 ueid = (char *)nla_data(nla_ueid);
174
175 return smc_clc_ueid_remove(ueid);
176 }
177
smc_nl_flush_ueid(struct sk_buff * skb,struct genl_info * info)178 int smc_nl_flush_ueid(struct sk_buff *skb, struct genl_info *info)
179 {
180 smc_clc_ueid_remove(NULL);
181 return 0;
182 }
183
smc_nl_ueid_dumpinfo(struct sk_buff * skb,u32 portid,u32 seq,u32 flags,char * ueid)184 static int smc_nl_ueid_dumpinfo(struct sk_buff *skb, u32 portid, u32 seq,
185 u32 flags, char *ueid)
186 {
187 char ueid_str[SMC_MAX_EID_LEN + 1];
188 void *hdr;
189
190 hdr = genlmsg_put(skb, portid, seq, &smc_gen_nl_family,
191 flags, SMC_NETLINK_DUMP_UEID);
192 if (!hdr)
193 return -ENOMEM;
194 memcpy(ueid_str, ueid, SMC_MAX_EID_LEN);
195 ueid_str[SMC_MAX_EID_LEN] = 0;
196 if (nla_put_string(skb, SMC_NLA_EID_TABLE_ENTRY, ueid_str)) {
197 genlmsg_cancel(skb, hdr);
198 return -EMSGSIZE;
199 }
200 genlmsg_end(skb, hdr);
201 return 0;
202 }
203
_smc_nl_ueid_dump(struct sk_buff * skb,u32 portid,u32 seq,int start_idx)204 static int _smc_nl_ueid_dump(struct sk_buff *skb, u32 portid, u32 seq,
205 int start_idx)
206 {
207 struct smc_clc_eid_entry *lst_ueid;
208 int idx = 0;
209
210 read_lock(&smc_clc_eid_table.lock);
211 list_for_each_entry(lst_ueid, &smc_clc_eid_table.list, list) {
212 if (idx++ < start_idx)
213 continue;
214 if (smc_nl_ueid_dumpinfo(skb, portid, seq, NLM_F_MULTI,
215 lst_ueid->eid)) {
216 --idx;
217 break;
218 }
219 }
220 read_unlock(&smc_clc_eid_table.lock);
221 return idx;
222 }
223
smc_nl_dump_ueid(struct sk_buff * skb,struct netlink_callback * cb)224 int smc_nl_dump_ueid(struct sk_buff *skb, struct netlink_callback *cb)
225 {
226 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
227 int idx;
228
229 idx = _smc_nl_ueid_dump(skb, NETLINK_CB(cb->skb).portid,
230 cb->nlh->nlmsg_seq, cb_ctx->pos[0]);
231
232 cb_ctx->pos[0] = idx;
233 return skb->len;
234 }
235
smc_nl_dump_seid(struct sk_buff * skb,struct netlink_callback * cb)236 int smc_nl_dump_seid(struct sk_buff *skb, struct netlink_callback *cb)
237 {
238 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
239 char seid_str[SMC_MAX_EID_LEN + 1];
240 u8 seid_enabled;
241 void *hdr;
242 u8 *seid;
243
244 if (cb_ctx->pos[0])
245 return skb->len;
246
247 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
248 &smc_gen_nl_family, NLM_F_MULTI,
249 SMC_NETLINK_DUMP_SEID);
250 if (!hdr)
251 return -ENOMEM;
252 if (!smc_ism_is_v2_capable())
253 goto end;
254
255 smc_ism_get_system_eid(&seid);
256 memcpy(seid_str, seid, SMC_MAX_EID_LEN);
257 seid_str[SMC_MAX_EID_LEN] = 0;
258 if (nla_put_string(skb, SMC_NLA_SEID_ENTRY, seid_str))
259 goto err;
260 read_lock(&smc_clc_eid_table.lock);
261 seid_enabled = smc_clc_eid_table.seid_enabled;
262 read_unlock(&smc_clc_eid_table.lock);
263 if (nla_put_u8(skb, SMC_NLA_SEID_ENABLED, seid_enabled))
264 goto err;
265 end:
266 genlmsg_end(skb, hdr);
267 cb_ctx->pos[0]++;
268 return skb->len;
269 err:
270 genlmsg_cancel(skb, hdr);
271 return -EMSGSIZE;
272 }
273
smc_nl_enable_seid(struct sk_buff * skb,struct genl_info * info)274 int smc_nl_enable_seid(struct sk_buff *skb, struct genl_info *info)
275 {
276 write_lock(&smc_clc_eid_table.lock);
277 smc_clc_eid_table.seid_enabled = 1;
278 write_unlock(&smc_clc_eid_table.lock);
279 return 0;
280 }
281
smc_nl_disable_seid(struct sk_buff * skb,struct genl_info * info)282 int smc_nl_disable_seid(struct sk_buff *skb, struct genl_info *info)
283 {
284 int rc = 0;
285
286 write_lock(&smc_clc_eid_table.lock);
287 if (!smc_clc_eid_table.ueid_cnt)
288 rc = -ENOENT;
289 else
290 smc_clc_eid_table.seid_enabled = 0;
291 write_unlock(&smc_clc_eid_table.lock);
292 return rc;
293 }
294
_smc_clc_match_ueid(u8 * peer_ueid)295 static bool _smc_clc_match_ueid(u8 *peer_ueid)
296 {
297 struct smc_clc_eid_entry *tmp_ueid;
298
299 list_for_each_entry(tmp_ueid, &smc_clc_eid_table.list, list) {
300 if (!memcmp(tmp_ueid->eid, peer_ueid, SMC_MAX_EID_LEN))
301 return true;
302 }
303 return false;
304 }
305
smc_clc_match_eid(u8 * negotiated_eid,struct smc_clc_v2_extension * smc_v2_ext,u8 * peer_eid,u8 * local_eid)306 bool smc_clc_match_eid(u8 *negotiated_eid,
307 struct smc_clc_v2_extension *smc_v2_ext,
308 u8 *peer_eid, u8 *local_eid)
309 {
310 bool match = false;
311 int i;
312
313 negotiated_eid[0] = 0;
314 read_lock(&smc_clc_eid_table.lock);
315 if (peer_eid && local_eid &&
316 smc_clc_eid_table.seid_enabled &&
317 smc_v2_ext->hdr.flag.seid &&
318 !memcmp(peer_eid, local_eid, SMC_MAX_EID_LEN)) {
319 memcpy(negotiated_eid, peer_eid, SMC_MAX_EID_LEN);
320 match = true;
321 goto out;
322 }
323
324 for (i = 0; i < smc_v2_ext->hdr.eid_cnt; i++) {
325 if (_smc_clc_match_ueid(smc_v2_ext->user_eids[i])) {
326 memcpy(negotiated_eid, smc_v2_ext->user_eids[i],
327 SMC_MAX_EID_LEN);
328 match = true;
329 goto out;
330 }
331 }
332 out:
333 read_unlock(&smc_clc_eid_table.lock);
334 return match;
335 }
336
337 /* check arriving CLC proposal */
smc_clc_msg_prop_valid(struct smc_clc_msg_proposal * pclc)338 static bool smc_clc_msg_prop_valid(struct smc_clc_msg_proposal *pclc)
339 {
340 struct smc_clc_msg_proposal_prefix *pclc_prfx;
341 struct smc_clc_smcd_v2_extension *smcd_v2_ext;
342 struct smc_clc_msg_hdr *hdr = &pclc->hdr;
343 struct smc_clc_v2_extension *v2_ext;
344
345 v2_ext = smc_get_clc_v2_ext(pclc);
346 pclc_prfx = smc_clc_proposal_get_prefix(pclc);
347 if (hdr->version == SMC_V1) {
348 if (hdr->typev1 == SMC_TYPE_N)
349 return false;
350 if (ntohs(hdr->length) !=
351 sizeof(*pclc) + ntohs(pclc->iparea_offset) +
352 sizeof(*pclc_prfx) +
353 pclc_prfx->ipv6_prefixes_cnt *
354 sizeof(struct smc_clc_ipv6_prefix) +
355 sizeof(struct smc_clc_msg_trail))
356 return false;
357 } else {
358 if (ntohs(hdr->length) !=
359 sizeof(*pclc) +
360 sizeof(struct smc_clc_msg_smcd) +
361 (hdr->typev1 != SMC_TYPE_N ?
362 sizeof(*pclc_prfx) +
363 pclc_prfx->ipv6_prefixes_cnt *
364 sizeof(struct smc_clc_ipv6_prefix) : 0) +
365 (hdr->typev2 != SMC_TYPE_N ?
366 sizeof(*v2_ext) +
367 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN : 0) +
368 (smcd_indicated(hdr->typev2) ?
369 sizeof(*smcd_v2_ext) + v2_ext->hdr.ism_gid_cnt *
370 sizeof(struct smc_clc_smcd_gid_chid) :
371 0) +
372 sizeof(struct smc_clc_msg_trail))
373 return false;
374 }
375 return true;
376 }
377
378 /* check arriving CLC accept or confirm */
379 static bool
smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm_v2 * clc_v2)380 smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm_v2 *clc_v2)
381 {
382 struct smc_clc_msg_hdr *hdr = &clc_v2->hdr;
383
384 if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
385 return false;
386 if (hdr->version == SMC_V1) {
387 if ((hdr->typev1 == SMC_TYPE_R &&
388 ntohs(hdr->length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) ||
389 (hdr->typev1 == SMC_TYPE_D &&
390 ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN))
391 return false;
392 } else {
393 if (hdr->typev1 == SMC_TYPE_D &&
394 ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 &&
395 (ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 +
396 sizeof(struct smc_clc_first_contact_ext)))
397 return false;
398 if (hdr->typev1 == SMC_TYPE_R &&
399 ntohs(hdr->length) < SMCR_CLC_ACCEPT_CONFIRM_LEN_V2)
400 return false;
401 }
402 return true;
403 }
404
405 /* check arriving CLC decline */
406 static bool
smc_clc_msg_decl_valid(struct smc_clc_msg_decline * dclc)407 smc_clc_msg_decl_valid(struct smc_clc_msg_decline *dclc)
408 {
409 struct smc_clc_msg_hdr *hdr = &dclc->hdr;
410
411 if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
412 return false;
413 if (hdr->version == SMC_V1) {
414 if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline))
415 return false;
416 } else {
417 if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline_v2))
418 return false;
419 }
420 return true;
421 }
422
smc_clc_fill_fce(struct smc_clc_first_contact_ext * fce,int * len)423 static void smc_clc_fill_fce(struct smc_clc_first_contact_ext *fce, int *len)
424 {
425 memset(fce, 0, sizeof(*fce));
426 fce->os_type = SMC_CLC_OS_LINUX;
427 fce->release = SMC_RELEASE;
428 memcpy(fce->hostname, smc_hostname, sizeof(smc_hostname));
429 (*len) += sizeof(*fce);
430 }
431
432 /* check if received message has a correct header length and contains valid
433 * heading and trailing eyecatchers
434 */
smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr * clcm,bool check_trl)435 static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl)
436 {
437 struct smc_clc_msg_accept_confirm_v2 *clc_v2;
438 struct smc_clc_msg_proposal *pclc;
439 struct smc_clc_msg_decline *dclc;
440 struct smc_clc_msg_trail *trl;
441
442 if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
443 memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
444 return false;
445 switch (clcm->type) {
446 case SMC_CLC_PROPOSAL:
447 pclc = (struct smc_clc_msg_proposal *)clcm;
448 if (!smc_clc_msg_prop_valid(pclc))
449 return false;
450 trl = (struct smc_clc_msg_trail *)
451 ((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl));
452 break;
453 case SMC_CLC_ACCEPT:
454 case SMC_CLC_CONFIRM:
455 clc_v2 = (struct smc_clc_msg_accept_confirm_v2 *)clcm;
456 if (!smc_clc_msg_acc_conf_valid(clc_v2))
457 return false;
458 trl = (struct smc_clc_msg_trail *)
459 ((u8 *)clc_v2 + ntohs(clc_v2->hdr.length) -
460 sizeof(*trl));
461 break;
462 case SMC_CLC_DECLINE:
463 dclc = (struct smc_clc_msg_decline *)clcm;
464 if (!smc_clc_msg_decl_valid(dclc))
465 return false;
466 check_trl = false;
467 break;
468 default:
469 return false;
470 }
471 if (check_trl &&
472 memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
473 memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
474 return false;
475 return true;
476 }
477
478 /* 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)479 static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4,
480 struct smc_clc_msg_proposal_prefix *prop)
481 {
482 struct in_device *in_dev = __in_dev_get_rcu(dst->dev);
483 const struct in_ifaddr *ifa;
484
485 if (!in_dev)
486 return -ENODEV;
487
488 in_dev_for_each_ifa_rcu(ifa, in_dev) {
489 if (!inet_ifa_match(ipv4, ifa))
490 continue;
491 prop->prefix_len = inet_mask_len(ifa->ifa_mask);
492 prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask;
493 /* prop->ipv6_prefixes_cnt = 0; already done by memset before */
494 return 0;
495 }
496 return -ENOENT;
497 }
498
499 /* 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)500 static int smc_clc_prfx_set6_rcu(struct dst_entry *dst,
501 struct smc_clc_msg_proposal_prefix *prop,
502 struct smc_clc_ipv6_prefix *ipv6_prfx)
503 {
504 #if IS_ENABLED(CONFIG_IPV6)
505 struct inet6_dev *in6_dev = __in6_dev_get(dst->dev);
506 struct inet6_ifaddr *ifa;
507 int cnt = 0;
508
509 if (!in6_dev)
510 return -ENODEV;
511 /* use a maximum of 8 IPv6 prefixes from device */
512 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
513 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
514 continue;
515 ipv6_addr_prefix(&ipv6_prfx[cnt].prefix,
516 &ifa->addr, ifa->prefix_len);
517 ipv6_prfx[cnt].prefix_len = ifa->prefix_len;
518 cnt++;
519 if (cnt == SMC_CLC_MAX_V6_PREFIX)
520 break;
521 }
522 prop->ipv6_prefixes_cnt = cnt;
523 if (cnt)
524 return 0;
525 #endif
526 return -ENOENT;
527 }
528
529 /* 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)530 static int smc_clc_prfx_set(struct socket *clcsock,
531 struct smc_clc_msg_proposal_prefix *prop,
532 struct smc_clc_ipv6_prefix *ipv6_prfx)
533 {
534 struct dst_entry *dst = sk_dst_get(clcsock->sk);
535 struct sockaddr_storage addrs;
536 struct sockaddr_in6 *addr6;
537 struct sockaddr_in *addr;
538 int rc = -ENOENT;
539
540 if (!dst) {
541 rc = -ENOTCONN;
542 goto out;
543 }
544 if (!dst->dev) {
545 rc = -ENODEV;
546 goto out_rel;
547 }
548 /* get address to which the internal TCP socket is bound */
549 if (kernel_getsockname(clcsock, (struct sockaddr *)&addrs) < 0)
550 goto out_rel;
551 /* analyze IP specific data of net_device belonging to TCP socket */
552 addr6 = (struct sockaddr_in6 *)&addrs;
553 rcu_read_lock();
554 if (addrs.ss_family == PF_INET) {
555 /* IPv4 */
556 addr = (struct sockaddr_in *)&addrs;
557 rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop);
558 } else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) {
559 /* mapped IPv4 address - peer is IPv4 only */
560 rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3],
561 prop);
562 } else {
563 /* IPv6 */
564 rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx);
565 }
566 rcu_read_unlock();
567 out_rel:
568 dst_release(dst);
569 out:
570 return rc;
571 }
572
573 /* 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)574 static int smc_clc_prfx_match4_rcu(struct net_device *dev,
575 struct smc_clc_msg_proposal_prefix *prop)
576 {
577 struct in_device *in_dev = __in_dev_get_rcu(dev);
578 const struct in_ifaddr *ifa;
579
580 if (!in_dev)
581 return -ENODEV;
582 in_dev_for_each_ifa_rcu(ifa, in_dev) {
583 if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) &&
584 inet_ifa_match(prop->outgoing_subnet, ifa))
585 return 0;
586 }
587
588 return -ENOENT;
589 }
590
591 /* 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)592 static int smc_clc_prfx_match6_rcu(struct net_device *dev,
593 struct smc_clc_msg_proposal_prefix *prop)
594 {
595 #if IS_ENABLED(CONFIG_IPV6)
596 struct inet6_dev *in6_dev = __in6_dev_get(dev);
597 struct smc_clc_ipv6_prefix *ipv6_prfx;
598 struct inet6_ifaddr *ifa;
599 int i, max;
600
601 if (!in6_dev)
602 return -ENODEV;
603 /* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */
604 ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop));
605 max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX);
606 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
607 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
608 continue;
609 for (i = 0; i < max; i++) {
610 if (ifa->prefix_len == ipv6_prfx[i].prefix_len &&
611 ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix,
612 ifa->prefix_len))
613 return 0;
614 }
615 }
616 #endif
617 return -ENOENT;
618 }
619
620 /* check if proposed prefixes match one of our device prefixes */
smc_clc_prfx_match(struct socket * clcsock,struct smc_clc_msg_proposal_prefix * prop)621 int smc_clc_prfx_match(struct socket *clcsock,
622 struct smc_clc_msg_proposal_prefix *prop)
623 {
624 struct dst_entry *dst = sk_dst_get(clcsock->sk);
625 int rc;
626
627 if (!dst) {
628 rc = -ENOTCONN;
629 goto out;
630 }
631 if (!dst->dev) {
632 rc = -ENODEV;
633 goto out_rel;
634 }
635 rcu_read_lock();
636 if (!prop->ipv6_prefixes_cnt)
637 rc = smc_clc_prfx_match4_rcu(dst->dev, prop);
638 else
639 rc = smc_clc_prfx_match6_rcu(dst->dev, prop);
640 rcu_read_unlock();
641 out_rel:
642 dst_release(dst);
643 out:
644 return rc;
645 }
646
647 /* Wait for data on the tcp-socket, analyze received data
648 * Returns:
649 * 0 if success and it was not a decline that we received.
650 * SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send.
651 * clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise.
652 */
smc_clc_wait_msg(struct smc_sock * smc,void * buf,int buflen,u8 expected_type,unsigned long timeout)653 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
654 u8 expected_type, unsigned long timeout)
655 {
656 long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo;
657 struct sock *clc_sk = smc->clcsock->sk;
658 struct smc_clc_msg_hdr *clcm = buf;
659 struct msghdr msg = {NULL, 0};
660 int reason_code = 0;
661 struct kvec vec = {buf, buflen};
662 int len, datlen, recvlen;
663 bool check_trl = true;
664 int krflags;
665
666 /* peek the first few bytes to determine length of data to receive
667 * so we don't consume any subsequent CLC message or payload data
668 * in the TCP byte stream
669 */
670 /*
671 * Caller must make sure that buflen is no less than
672 * sizeof(struct smc_clc_msg_hdr)
673 */
674 krflags = MSG_PEEK | MSG_WAITALL;
675 clc_sk->sk_rcvtimeo = timeout;
676 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1,
677 sizeof(struct smc_clc_msg_hdr));
678 len = sock_recvmsg(smc->clcsock, &msg, krflags);
679 if (signal_pending(current)) {
680 reason_code = -EINTR;
681 clc_sk->sk_err = EINTR;
682 smc->sk.sk_err = EINTR;
683 goto out;
684 }
685 if (clc_sk->sk_err) {
686 reason_code = -clc_sk->sk_err;
687 if (clc_sk->sk_err == EAGAIN &&
688 expected_type == SMC_CLC_DECLINE)
689 clc_sk->sk_err = 0; /* reset for fallback usage */
690 else
691 smc->sk.sk_err = clc_sk->sk_err;
692 goto out;
693 }
694 if (!len) { /* peer has performed orderly shutdown */
695 smc->sk.sk_err = ECONNRESET;
696 reason_code = -ECONNRESET;
697 goto out;
698 }
699 if (len < 0) {
700 if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE)
701 smc->sk.sk_err = -len;
702 reason_code = len;
703 goto out;
704 }
705 datlen = ntohs(clcm->length);
706 if ((len < sizeof(struct smc_clc_msg_hdr)) ||
707 (clcm->version < SMC_V1) ||
708 ((clcm->type != SMC_CLC_DECLINE) &&
709 (clcm->type != expected_type))) {
710 smc->sk.sk_err = EPROTO;
711 reason_code = -EPROTO;
712 goto out;
713 }
714
715 /* receive the complete CLC message */
716 memset(&msg, 0, sizeof(struct msghdr));
717 if (datlen > buflen) {
718 check_trl = false;
719 recvlen = buflen;
720 } else {
721 recvlen = datlen;
722 }
723 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
724 krflags = MSG_WAITALL;
725 len = sock_recvmsg(smc->clcsock, &msg, krflags);
726 if (len < recvlen || !smc_clc_msg_hdr_valid(clcm, check_trl)) {
727 smc->sk.sk_err = EPROTO;
728 reason_code = -EPROTO;
729 goto out;
730 }
731 datlen -= len;
732 while (datlen) {
733 u8 tmp[SMC_CLC_RECV_BUF_LEN];
734
735 vec.iov_base = &tmp;
736 vec.iov_len = SMC_CLC_RECV_BUF_LEN;
737 /* receive remaining proposal message */
738 recvlen = datlen > SMC_CLC_RECV_BUF_LEN ?
739 SMC_CLC_RECV_BUF_LEN : datlen;
740 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
741 len = sock_recvmsg(smc->clcsock, &msg, krflags);
742 datlen -= len;
743 }
744 if (clcm->type == SMC_CLC_DECLINE) {
745 struct smc_clc_msg_decline *dclc;
746
747 dclc = (struct smc_clc_msg_decline *)clcm;
748 reason_code = SMC_CLC_DECL_PEERDECL;
749 smc->peer_diagnosis = ntohl(dclc->peer_diagnosis);
750 if (((struct smc_clc_msg_decline *)buf)->hdr.typev2 &
751 SMC_FIRST_CONTACT_MASK) {
752 smc->conn.lgr->sync_err = 1;
753 smc_lgr_terminate_sched(smc->conn.lgr);
754 }
755 }
756
757 out:
758 clc_sk->sk_rcvtimeo = rcvtimeo;
759 return reason_code;
760 }
761
762 /* send CLC DECLINE message across internal TCP socket */
smc_clc_send_decline(struct smc_sock * smc,u32 peer_diag_info,u8 version)763 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version)
764 {
765 struct smc_clc_msg_decline *dclc_v1;
766 struct smc_clc_msg_decline_v2 dclc;
767 struct msghdr msg;
768 int len, send_len;
769 struct kvec vec;
770
771 dclc_v1 = (struct smc_clc_msg_decline *)&dclc;
772 memset(&dclc, 0, sizeof(dclc));
773 memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
774 dclc.hdr.type = SMC_CLC_DECLINE;
775 dclc.hdr.version = version;
776 dclc.os_type = version == SMC_V1 ? 0 : SMC_CLC_OS_LINUX;
777 dclc.hdr.typev2 = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ?
778 SMC_FIRST_CONTACT_MASK : 0;
779 if ((!smc_conn_lgr_valid(&smc->conn) || !smc->conn.lgr->is_smcd) &&
780 smc_ib_is_valid_local_systemid())
781 memcpy(dclc.id_for_peer, local_systemid,
782 sizeof(local_systemid));
783 dclc.peer_diagnosis = htonl(peer_diag_info);
784 if (version == SMC_V1) {
785 memcpy(dclc_v1->trl.eyecatcher, SMC_EYECATCHER,
786 sizeof(SMC_EYECATCHER));
787 send_len = sizeof(*dclc_v1);
788 } else {
789 memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER,
790 sizeof(SMC_EYECATCHER));
791 send_len = sizeof(dclc);
792 }
793 dclc.hdr.length = htons(send_len);
794
795 memset(&msg, 0, sizeof(msg));
796 vec.iov_base = &dclc;
797 vec.iov_len = send_len;
798 len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, send_len);
799 if (len < 0 || len < send_len)
800 len = -EPROTO;
801 return len > 0 ? 0 : len;
802 }
803
804 /* send CLC PROPOSAL message across internal TCP socket */
smc_clc_send_proposal(struct smc_sock * smc,struct smc_init_info * ini)805 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini)
806 {
807 struct smc_clc_smcd_v2_extension *smcd_v2_ext;
808 struct smc_clc_msg_proposal_prefix *pclc_prfx;
809 struct smc_clc_msg_proposal *pclc_base;
810 struct smc_clc_smcd_gid_chid *gidchids;
811 struct smc_clc_msg_proposal_area *pclc;
812 struct smc_clc_ipv6_prefix *ipv6_prfx;
813 struct smc_clc_v2_extension *v2_ext;
814 struct smc_clc_msg_smcd *pclc_smcd;
815 struct smc_clc_msg_trail *trl;
816 struct smcd_dev *smcd;
817 int len, i, plen, rc;
818 int reason_code = 0;
819 struct kvec vec[8];
820 struct msghdr msg;
821
822 pclc = kzalloc(sizeof(*pclc), GFP_KERNEL);
823 if (!pclc)
824 return -ENOMEM;
825
826 pclc_base = &pclc->pclc_base;
827 pclc_smcd = &pclc->pclc_smcd;
828 pclc_prfx = &pclc->pclc_prfx;
829 ipv6_prfx = pclc->pclc_prfx_ipv6;
830 v2_ext = &pclc->pclc_v2_ext;
831 smcd_v2_ext = &pclc->pclc_smcd_v2_ext;
832 gidchids = pclc->pclc_gidchids;
833 trl = &pclc->pclc_trl;
834
835 pclc_base->hdr.version = SMC_V2;
836 pclc_base->hdr.typev1 = ini->smc_type_v1;
837 pclc_base->hdr.typev2 = ini->smc_type_v2;
838 plen = sizeof(*pclc_base) + sizeof(*pclc_smcd) + sizeof(*trl);
839
840 /* retrieve ip prefixes for CLC proposal msg */
841 if (ini->smc_type_v1 != SMC_TYPE_N) {
842 rc = smc_clc_prfx_set(smc->clcsock, pclc_prfx, ipv6_prfx);
843 if (rc) {
844 if (ini->smc_type_v2 == SMC_TYPE_N) {
845 kfree(pclc);
846 return SMC_CLC_DECL_CNFERR;
847 }
848 pclc_base->hdr.typev1 = SMC_TYPE_N;
849 } else {
850 pclc_base->iparea_offset = htons(sizeof(*pclc_smcd));
851 plen += sizeof(*pclc_prfx) +
852 pclc_prfx->ipv6_prefixes_cnt *
853 sizeof(ipv6_prfx[0]);
854 }
855 }
856
857 /* build SMC Proposal CLC message */
858 memcpy(pclc_base->hdr.eyecatcher, SMC_EYECATCHER,
859 sizeof(SMC_EYECATCHER));
860 pclc_base->hdr.type = SMC_CLC_PROPOSAL;
861 if (smcr_indicated(ini->smc_type_v1)) {
862 /* add SMC-R specifics */
863 memcpy(pclc_base->lcl.id_for_peer, local_systemid,
864 sizeof(local_systemid));
865 memcpy(pclc_base->lcl.gid, ini->ib_gid, SMC_GID_SIZE);
866 memcpy(pclc_base->lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1],
867 ETH_ALEN);
868 }
869 if (smcd_indicated(ini->smc_type_v1)) {
870 /* add SMC-D specifics */
871 if (ini->ism_dev[0]) {
872 smcd = ini->ism_dev[0];
873 pclc_smcd->ism.gid =
874 htonll(smcd->ops->get_local_gid(smcd));
875 pclc_smcd->ism.chid =
876 htons(smc_ism_get_chid(ini->ism_dev[0]));
877 }
878 }
879 if (ini->smc_type_v2 == SMC_TYPE_N) {
880 pclc_smcd->v2_ext_offset = 0;
881 } else {
882 struct smc_clc_eid_entry *ueident;
883 u16 v2_ext_offset;
884
885 v2_ext->hdr.flag.release = SMC_RELEASE;
886 v2_ext_offset = sizeof(*pclc_smcd) -
887 offsetofend(struct smc_clc_msg_smcd, v2_ext_offset);
888 if (ini->smc_type_v1 != SMC_TYPE_N)
889 v2_ext_offset += sizeof(*pclc_prfx) +
890 pclc_prfx->ipv6_prefixes_cnt *
891 sizeof(ipv6_prfx[0]);
892 pclc_smcd->v2_ext_offset = htons(v2_ext_offset);
893 plen += sizeof(*v2_ext);
894
895 read_lock(&smc_clc_eid_table.lock);
896 v2_ext->hdr.eid_cnt = smc_clc_eid_table.ueid_cnt;
897 plen += smc_clc_eid_table.ueid_cnt * SMC_MAX_EID_LEN;
898 i = 0;
899 list_for_each_entry(ueident, &smc_clc_eid_table.list, list) {
900 memcpy(v2_ext->user_eids[i++], ueident->eid,
901 sizeof(ueident->eid));
902 }
903 read_unlock(&smc_clc_eid_table.lock);
904 }
905 if (smcd_indicated(ini->smc_type_v2)) {
906 u8 *eid = NULL;
907
908 v2_ext->hdr.flag.seid = smc_clc_eid_table.seid_enabled;
909 v2_ext->hdr.ism_gid_cnt = ini->ism_offered_cnt;
910 v2_ext->hdr.smcd_v2_ext_offset = htons(sizeof(*v2_ext) -
911 offsetofend(struct smc_clnt_opts_area_hdr,
912 smcd_v2_ext_offset) +
913 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);
914 smc_ism_get_system_eid(&eid);
915 if (eid && v2_ext->hdr.flag.seid)
916 memcpy(smcd_v2_ext->system_eid, eid, SMC_MAX_EID_LEN);
917 plen += sizeof(*smcd_v2_ext);
918 if (ini->ism_offered_cnt) {
919 for (i = 1; i <= ini->ism_offered_cnt; i++) {
920 smcd = ini->ism_dev[i];
921 gidchids[i - 1].gid =
922 htonll(smcd->ops->get_local_gid(smcd));
923 gidchids[i - 1].chid =
924 htons(smc_ism_get_chid(ini->ism_dev[i]));
925 }
926 plen += ini->ism_offered_cnt *
927 sizeof(struct smc_clc_smcd_gid_chid);
928 }
929 }
930 if (smcr_indicated(ini->smc_type_v2))
931 memcpy(v2_ext->roce, ini->smcrv2.ib_gid_v2, SMC_GID_SIZE);
932
933 pclc_base->hdr.length = htons(plen);
934 memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
935
936 /* send SMC Proposal CLC message */
937 memset(&msg, 0, sizeof(msg));
938 i = 0;
939 vec[i].iov_base = pclc_base;
940 vec[i++].iov_len = sizeof(*pclc_base);
941 vec[i].iov_base = pclc_smcd;
942 vec[i++].iov_len = sizeof(*pclc_smcd);
943 if (ini->smc_type_v1 != SMC_TYPE_N) {
944 vec[i].iov_base = pclc_prfx;
945 vec[i++].iov_len = sizeof(*pclc_prfx);
946 if (pclc_prfx->ipv6_prefixes_cnt > 0) {
947 vec[i].iov_base = ipv6_prfx;
948 vec[i++].iov_len = pclc_prfx->ipv6_prefixes_cnt *
949 sizeof(ipv6_prfx[0]);
950 }
951 }
952 if (ini->smc_type_v2 != SMC_TYPE_N) {
953 vec[i].iov_base = v2_ext;
954 vec[i++].iov_len = sizeof(*v2_ext) +
955 (v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);
956 if (smcd_indicated(ini->smc_type_v2)) {
957 vec[i].iov_base = smcd_v2_ext;
958 vec[i++].iov_len = sizeof(*smcd_v2_ext);
959 if (ini->ism_offered_cnt) {
960 vec[i].iov_base = gidchids;
961 vec[i++].iov_len = ini->ism_offered_cnt *
962 sizeof(struct smc_clc_smcd_gid_chid);
963 }
964 }
965 }
966 vec[i].iov_base = trl;
967 vec[i++].iov_len = sizeof(*trl);
968 /* due to the few bytes needed for clc-handshake this cannot block */
969 len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen);
970 if (len < 0) {
971 smc->sk.sk_err = smc->clcsock->sk->sk_err;
972 reason_code = -smc->sk.sk_err;
973 } else if (len < ntohs(pclc_base->hdr.length)) {
974 reason_code = -ENETUNREACH;
975 smc->sk.sk_err = -reason_code;
976 }
977
978 kfree(pclc);
979 return reason_code;
980 }
981
982 /* build and send CLC CONFIRM / ACCEPT message */
smc_clc_send_confirm_accept(struct smc_sock * smc,struct smc_clc_msg_accept_confirm_v2 * clc_v2,int first_contact,u8 version,u8 * eid,struct smc_init_info * ini)983 static int smc_clc_send_confirm_accept(struct smc_sock *smc,
984 struct smc_clc_msg_accept_confirm_v2 *clc_v2,
985 int first_contact, u8 version,
986 u8 *eid, struct smc_init_info *ini)
987 {
988 struct smc_connection *conn = &smc->conn;
989 struct smc_clc_msg_accept_confirm *clc;
990 struct smc_clc_first_contact_ext fce;
991 struct smc_clc_fce_gid_ext gle;
992 struct smc_clc_msg_trail trl;
993 struct kvec vec[5];
994 struct msghdr msg;
995 int i, len;
996
997 /* send SMC Confirm CLC msg */
998 clc = (struct smc_clc_msg_accept_confirm *)clc_v2;
999 clc->hdr.version = version; /* SMC version */
1000 if (first_contact)
1001 clc->hdr.typev2 |= SMC_FIRST_CONTACT_MASK;
1002 if (conn->lgr->is_smcd) {
1003 /* SMC-D specific settings */
1004 memcpy(clc->hdr.eyecatcher, SMCD_EYECATCHER,
1005 sizeof(SMCD_EYECATCHER));
1006 clc->hdr.typev1 = SMC_TYPE_D;
1007 clc->d0.gid =
1008 conn->lgr->smcd->ops->get_local_gid(conn->lgr->smcd);
1009 clc->d0.token = conn->rmb_desc->token;
1010 clc->d0.dmbe_size = conn->rmbe_size_short;
1011 clc->d0.dmbe_idx = 0;
1012 memcpy(&clc->d0.linkid, conn->lgr->id, SMC_LGR_ID_SIZE);
1013 if (version == SMC_V1) {
1014 clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
1015 } else {
1016 clc_v2->d1.chid =
1017 htons(smc_ism_get_chid(conn->lgr->smcd));
1018 if (eid && eid[0])
1019 memcpy(clc_v2->d1.eid, eid, SMC_MAX_EID_LEN);
1020 len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2;
1021 if (first_contact)
1022 smc_clc_fill_fce(&fce, &len);
1023 clc_v2->hdr.length = htons(len);
1024 }
1025 memcpy(trl.eyecatcher, SMCD_EYECATCHER,
1026 sizeof(SMCD_EYECATCHER));
1027 } else {
1028 struct smc_link *link = conn->lnk;
1029
1030 /* SMC-R specific settings */
1031 memcpy(clc->hdr.eyecatcher, SMC_EYECATCHER,
1032 sizeof(SMC_EYECATCHER));
1033 clc->hdr.typev1 = SMC_TYPE_R;
1034 clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
1035 memcpy(clc->r0.lcl.id_for_peer, local_systemid,
1036 sizeof(local_systemid));
1037 memcpy(&clc->r0.lcl.gid, link->gid, SMC_GID_SIZE);
1038 memcpy(&clc->r0.lcl.mac, &link->smcibdev->mac[link->ibport - 1],
1039 ETH_ALEN);
1040 hton24(clc->r0.qpn, link->roce_qp->qp_num);
1041 clc->r0.rmb_rkey =
1042 htonl(conn->rmb_desc->mr[link->link_idx]->rkey);
1043 clc->r0.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */
1044 clc->r0.rmbe_alert_token = htonl(conn->alert_token_local);
1045 switch (clc->hdr.type) {
1046 case SMC_CLC_ACCEPT:
1047 clc->r0.qp_mtu = link->path_mtu;
1048 break;
1049 case SMC_CLC_CONFIRM:
1050 clc->r0.qp_mtu = min(link->path_mtu, link->peer_mtu);
1051 break;
1052 }
1053 clc->r0.rmbe_size = conn->rmbe_size_short;
1054 clc->r0.rmb_dma_addr = conn->rmb_desc->is_vm ?
1055 cpu_to_be64((uintptr_t)conn->rmb_desc->cpu_addr) :
1056 cpu_to_be64((u64)sg_dma_address
1057 (conn->rmb_desc->sgt[link->link_idx].sgl));
1058 hton24(clc->r0.psn, link->psn_initial);
1059 if (version == SMC_V1) {
1060 clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
1061 } else {
1062 if (eid && eid[0])
1063 memcpy(clc_v2->r1.eid, eid, SMC_MAX_EID_LEN);
1064 len = SMCR_CLC_ACCEPT_CONFIRM_LEN_V2;
1065 if (first_contact) {
1066 smc_clc_fill_fce(&fce, &len);
1067 fce.v2_direct = !link->lgr->uses_gateway;
1068 memset(&gle, 0, sizeof(gle));
1069 if (ini && clc->hdr.type == SMC_CLC_CONFIRM) {
1070 gle.gid_cnt = ini->smcrv2.gidlist.len;
1071 len += sizeof(gle);
1072 len += gle.gid_cnt * sizeof(gle.gid[0]);
1073 } else {
1074 len += sizeof(gle.reserved);
1075 }
1076 }
1077 clc_v2->hdr.length = htons(len);
1078 }
1079 memcpy(trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
1080 }
1081
1082 memset(&msg, 0, sizeof(msg));
1083 i = 0;
1084 vec[i].iov_base = clc_v2;
1085 if (version > SMC_V1)
1086 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ?
1087 SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 :
1088 SMCR_CLC_ACCEPT_CONFIRM_LEN_V2) -
1089 sizeof(trl);
1090 else
1091 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ?
1092 SMCD_CLC_ACCEPT_CONFIRM_LEN :
1093 SMCR_CLC_ACCEPT_CONFIRM_LEN) -
1094 sizeof(trl);
1095 if (version > SMC_V1 && first_contact) {
1096 vec[i].iov_base = &fce;
1097 vec[i++].iov_len = sizeof(fce);
1098 if (!conn->lgr->is_smcd) {
1099 if (clc->hdr.type == SMC_CLC_CONFIRM) {
1100 vec[i].iov_base = &gle;
1101 vec[i++].iov_len = sizeof(gle);
1102 vec[i].iov_base = &ini->smcrv2.gidlist.list;
1103 vec[i++].iov_len = gle.gid_cnt *
1104 sizeof(gle.gid[0]);
1105 } else {
1106 vec[i].iov_base = &gle.reserved;
1107 vec[i++].iov_len = sizeof(gle.reserved);
1108 }
1109 }
1110 }
1111 vec[i].iov_base = &trl;
1112 vec[i++].iov_len = sizeof(trl);
1113 return kernel_sendmsg(smc->clcsock, &msg, vec, 1,
1114 ntohs(clc->hdr.length));
1115 }
1116
1117 /* 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)1118 int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
1119 u8 version, u8 *eid, struct smc_init_info *ini)
1120 {
1121 struct smc_clc_msg_accept_confirm_v2 cclc_v2;
1122 int reason_code = 0;
1123 int len;
1124
1125 /* send SMC Confirm CLC msg */
1126 memset(&cclc_v2, 0, sizeof(cclc_v2));
1127 cclc_v2.hdr.type = SMC_CLC_CONFIRM;
1128 len = smc_clc_send_confirm_accept(smc, &cclc_v2, clnt_first_contact,
1129 version, eid, ini);
1130 if (len < ntohs(cclc_v2.hdr.length)) {
1131 if (len >= 0) {
1132 reason_code = -ENETUNREACH;
1133 smc->sk.sk_err = -reason_code;
1134 } else {
1135 smc->sk.sk_err = smc->clcsock->sk->sk_err;
1136 reason_code = -smc->sk.sk_err;
1137 }
1138 }
1139 return reason_code;
1140 }
1141
1142 /* 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)1143 int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact,
1144 u8 version, u8 *negotiated_eid)
1145 {
1146 struct smc_clc_msg_accept_confirm_v2 aclc_v2;
1147 int len;
1148
1149 memset(&aclc_v2, 0, sizeof(aclc_v2));
1150 aclc_v2.hdr.type = SMC_CLC_ACCEPT;
1151 len = smc_clc_send_confirm_accept(new_smc, &aclc_v2, srv_first_contact,
1152 version, negotiated_eid, NULL);
1153 if (len < ntohs(aclc_v2.hdr.length))
1154 len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err;
1155
1156 return len > 0 ? 0 : len;
1157 }
1158
smc_clc_get_hostname(u8 ** host)1159 void smc_clc_get_hostname(u8 **host)
1160 {
1161 *host = &smc_hostname[0];
1162 }
1163
smc_clc_init(void)1164 void __init smc_clc_init(void)
1165 {
1166 struct new_utsname *u;
1167
1168 memset(smc_hostname, _S, sizeof(smc_hostname)); /* ASCII blanks */
1169 u = utsname();
1170 memcpy(smc_hostname, u->nodename,
1171 min_t(size_t, strlen(u->nodename), sizeof(smc_hostname)));
1172
1173 INIT_LIST_HEAD(&smc_clc_eid_table.list);
1174 rwlock_init(&smc_clc_eid_table.lock);
1175 smc_clc_eid_table.ueid_cnt = 0;
1176 smc_clc_eid_table.seid_enabled = 1;
1177 }
1178
smc_clc_exit(void)1179 void smc_clc_exit(void)
1180 {
1181 smc_clc_ueid_remove(NULL);
1182 }
1183