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 */ 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 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 } 117 118 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 } 128 129 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 */ 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 } 167 168 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 } 179 180 int smc_nl_flush_ueid(struct sk_buff *skb, struct genl_info *info) 181 { 182 smc_clc_ueid_remove(NULL); 183 return 0; 184 } 185 186 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 } 205 206 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 } 225 226 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 } 237 238 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 } 275 276 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 } 287 288 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 } 304 305 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 } 315 316 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 */ 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 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 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 } 438 439 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 */ 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 */ 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 */ 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 */ 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 */ 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 */ 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 */ 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 */ 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 = READ_ONCE(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 WRITE_ONCE(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 WRITE_ONCE(clc_sk->sk_rcvtimeo, rcvtimeo); 797 return reason_code; 798 } 799 800 /* send CLC DECLINE message across internal TCP socket */ 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 */ 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 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 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 */ 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 */ 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 */ 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 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 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 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 1339 void smc_clc_get_hostname(u8 **host) 1340 { 1341 *host = &smc_hostname[0]; 1342 } 1343 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 1363 void smc_clc_exit(void) 1364 { 1365 smc_clc_ueid_remove(NULL); 1366 } 1367