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 v2_ext = smc_get_clc_v2_ext(pclc); 356 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 357 if (hdr->version == SMC_V1) { 358 if (hdr->typev1 == SMC_TYPE_N) 359 return false; 360 if (ntohs(hdr->length) != 361 sizeof(*pclc) + ntohs(pclc->iparea_offset) + 362 sizeof(*pclc_prfx) + 363 pclc_prfx->ipv6_prefixes_cnt * 364 sizeof(struct smc_clc_ipv6_prefix) + 365 sizeof(struct smc_clc_msg_trail)) 366 return false; 367 } else { 368 if (ntohs(hdr->length) != 369 sizeof(*pclc) + 370 sizeof(struct smc_clc_msg_smcd) + 371 (hdr->typev1 != SMC_TYPE_N ? 372 sizeof(*pclc_prfx) + 373 pclc_prfx->ipv6_prefixes_cnt * 374 sizeof(struct smc_clc_ipv6_prefix) : 0) + 375 (hdr->typev2 != SMC_TYPE_N ? 376 sizeof(*v2_ext) + 377 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN : 0) + 378 (smcd_indicated(hdr->typev2) ? 379 sizeof(*smcd_v2_ext) + v2_ext->hdr.ism_gid_cnt * 380 sizeof(struct smc_clc_smcd_gid_chid) : 381 0) + 382 sizeof(struct smc_clc_msg_trail)) 383 return false; 384 } 385 return true; 386 } 387 388 /* check arriving CLC accept or confirm */ 389 static bool 390 smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm *clc) 391 { 392 struct smc_clc_msg_hdr *hdr = &clc->hdr; 393 394 if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D) 395 return false; 396 if (hdr->version == SMC_V1) { 397 if ((hdr->typev1 == SMC_TYPE_R && 398 ntohs(hdr->length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) || 399 (hdr->typev1 == SMC_TYPE_D && 400 ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN)) 401 return false; 402 } else { 403 if (hdr->typev1 == SMC_TYPE_D && 404 ntohs(hdr->length) < SMCD_CLC_ACCEPT_CONFIRM_LEN_V2) 405 return false; 406 if (hdr->typev1 == SMC_TYPE_R && 407 ntohs(hdr->length) < SMCR_CLC_ACCEPT_CONFIRM_LEN_V2) 408 return false; 409 } 410 return true; 411 } 412 413 /* check arriving CLC decline */ 414 static bool 415 smc_clc_msg_decl_valid(struct smc_clc_msg_decline *dclc) 416 { 417 struct smc_clc_msg_hdr *hdr = &dclc->hdr; 418 419 if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D) 420 return false; 421 if (hdr->version == SMC_V1) { 422 if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline)) 423 return false; 424 } else { 425 if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline_v2)) 426 return false; 427 } 428 return true; 429 } 430 431 static int smc_clc_fill_fce_v2x(struct smc_clc_first_contact_ext_v2x *fce_v2x, 432 struct smc_init_info *ini) 433 { 434 int ret = sizeof(*fce_v2x); 435 436 memset(fce_v2x, 0, sizeof(*fce_v2x)); 437 fce_v2x->fce_v2_base.os_type = SMC_CLC_OS_LINUX; 438 fce_v2x->fce_v2_base.release = ini->release_nr; 439 memcpy(fce_v2x->fce_v2_base.hostname, 440 smc_hostname, sizeof(smc_hostname)); 441 if (ini->is_smcd && ini->release_nr < SMC_RELEASE_1) { 442 ret = sizeof(struct smc_clc_first_contact_ext); 443 goto out; 444 } 445 446 if (ini->release_nr >= SMC_RELEASE_1) { 447 if (!ini->is_smcd) { 448 fce_v2x->max_conns = ini->max_conns; 449 fce_v2x->max_links = ini->max_links; 450 } 451 fce_v2x->feature_mask = htons(ini->feature_mask); 452 } 453 454 out: 455 return ret; 456 } 457 458 /* check if received message has a correct header length and contains valid 459 * heading and trailing eyecatchers 460 */ 461 static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl) 462 { 463 struct smc_clc_msg_accept_confirm *clc; 464 struct smc_clc_msg_proposal *pclc; 465 struct smc_clc_msg_decline *dclc; 466 struct smc_clc_msg_trail *trl; 467 468 if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) && 469 memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER))) 470 return false; 471 switch (clcm->type) { 472 case SMC_CLC_PROPOSAL: 473 pclc = (struct smc_clc_msg_proposal *)clcm; 474 if (!smc_clc_msg_prop_valid(pclc)) 475 return false; 476 trl = (struct smc_clc_msg_trail *) 477 ((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl)); 478 break; 479 case SMC_CLC_ACCEPT: 480 case SMC_CLC_CONFIRM: 481 clc = (struct smc_clc_msg_accept_confirm *)clcm; 482 if (!smc_clc_msg_acc_conf_valid(clc)) 483 return false; 484 trl = (struct smc_clc_msg_trail *) 485 ((u8 *)clc + ntohs(clc->hdr.length) - sizeof(*trl)); 486 break; 487 case SMC_CLC_DECLINE: 488 dclc = (struct smc_clc_msg_decline *)clcm; 489 if (!smc_clc_msg_decl_valid(dclc)) 490 return false; 491 check_trl = false; 492 break; 493 default: 494 return false; 495 } 496 if (check_trl && 497 memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) && 498 memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER))) 499 return false; 500 return true; 501 } 502 503 /* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */ 504 static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4, 505 struct smc_clc_msg_proposal_prefix *prop) 506 { 507 struct in_device *in_dev = __in_dev_get_rcu(dst->dev); 508 const struct in_ifaddr *ifa; 509 510 if (!in_dev) 511 return -ENODEV; 512 513 in_dev_for_each_ifa_rcu(ifa, in_dev) { 514 if (!inet_ifa_match(ipv4, ifa)) 515 continue; 516 prop->prefix_len = inet_mask_len(ifa->ifa_mask); 517 prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask; 518 /* prop->ipv6_prefixes_cnt = 0; already done by memset before */ 519 return 0; 520 } 521 return -ENOENT; 522 } 523 524 /* fill CLC proposal msg with ipv6 prefixes from device */ 525 static int smc_clc_prfx_set6_rcu(struct dst_entry *dst, 526 struct smc_clc_msg_proposal_prefix *prop, 527 struct smc_clc_ipv6_prefix *ipv6_prfx) 528 { 529 #if IS_ENABLED(CONFIG_IPV6) 530 struct inet6_dev *in6_dev = __in6_dev_get(dst->dev); 531 struct inet6_ifaddr *ifa; 532 int cnt = 0; 533 534 if (!in6_dev) 535 return -ENODEV; 536 /* use a maximum of 8 IPv6 prefixes from device */ 537 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) { 538 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL) 539 continue; 540 ipv6_addr_prefix(&ipv6_prfx[cnt].prefix, 541 &ifa->addr, ifa->prefix_len); 542 ipv6_prfx[cnt].prefix_len = ifa->prefix_len; 543 cnt++; 544 if (cnt == SMC_CLC_MAX_V6_PREFIX) 545 break; 546 } 547 prop->ipv6_prefixes_cnt = cnt; 548 if (cnt) 549 return 0; 550 #endif 551 return -ENOENT; 552 } 553 554 /* retrieve and set prefixes in CLC proposal msg */ 555 static int smc_clc_prfx_set(struct socket *clcsock, 556 struct smc_clc_msg_proposal_prefix *prop, 557 struct smc_clc_ipv6_prefix *ipv6_prfx) 558 { 559 struct dst_entry *dst = sk_dst_get(clcsock->sk); 560 struct sockaddr_storage addrs; 561 struct sockaddr_in6 *addr6; 562 struct sockaddr_in *addr; 563 int rc = -ENOENT; 564 565 if (!dst) { 566 rc = -ENOTCONN; 567 goto out; 568 } 569 if (!dst->dev) { 570 rc = -ENODEV; 571 goto out_rel; 572 } 573 /* get address to which the internal TCP socket is bound */ 574 if (kernel_getsockname(clcsock, (struct sockaddr *)&addrs) < 0) 575 goto out_rel; 576 /* analyze IP specific data of net_device belonging to TCP socket */ 577 addr6 = (struct sockaddr_in6 *)&addrs; 578 rcu_read_lock(); 579 if (addrs.ss_family == PF_INET) { 580 /* IPv4 */ 581 addr = (struct sockaddr_in *)&addrs; 582 rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop); 583 } else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) { 584 /* mapped IPv4 address - peer is IPv4 only */ 585 rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3], 586 prop); 587 } else { 588 /* IPv6 */ 589 rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx); 590 } 591 rcu_read_unlock(); 592 out_rel: 593 dst_release(dst); 594 out: 595 return rc; 596 } 597 598 /* match ipv4 addrs of dev against addr in CLC proposal */ 599 static int smc_clc_prfx_match4_rcu(struct net_device *dev, 600 struct smc_clc_msg_proposal_prefix *prop) 601 { 602 struct in_device *in_dev = __in_dev_get_rcu(dev); 603 const struct in_ifaddr *ifa; 604 605 if (!in_dev) 606 return -ENODEV; 607 in_dev_for_each_ifa_rcu(ifa, in_dev) { 608 if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) && 609 inet_ifa_match(prop->outgoing_subnet, ifa)) 610 return 0; 611 } 612 613 return -ENOENT; 614 } 615 616 /* match ipv6 addrs of dev against addrs in CLC proposal */ 617 static int smc_clc_prfx_match6_rcu(struct net_device *dev, 618 struct smc_clc_msg_proposal_prefix *prop) 619 { 620 #if IS_ENABLED(CONFIG_IPV6) 621 struct inet6_dev *in6_dev = __in6_dev_get(dev); 622 struct smc_clc_ipv6_prefix *ipv6_prfx; 623 struct inet6_ifaddr *ifa; 624 int i, max; 625 626 if (!in6_dev) 627 return -ENODEV; 628 /* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */ 629 ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop)); 630 max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX); 631 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) { 632 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL) 633 continue; 634 for (i = 0; i < max; i++) { 635 if (ifa->prefix_len == ipv6_prfx[i].prefix_len && 636 ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix, 637 ifa->prefix_len)) 638 return 0; 639 } 640 } 641 #endif 642 return -ENOENT; 643 } 644 645 /* check if proposed prefixes match one of our device prefixes */ 646 int smc_clc_prfx_match(struct socket *clcsock, 647 struct smc_clc_msg_proposal_prefix *prop) 648 { 649 struct dst_entry *dst = sk_dst_get(clcsock->sk); 650 int rc; 651 652 if (!dst) { 653 rc = -ENOTCONN; 654 goto out; 655 } 656 if (!dst->dev) { 657 rc = -ENODEV; 658 goto out_rel; 659 } 660 rcu_read_lock(); 661 if (!prop->ipv6_prefixes_cnt) 662 rc = smc_clc_prfx_match4_rcu(dst->dev, prop); 663 else 664 rc = smc_clc_prfx_match6_rcu(dst->dev, prop); 665 rcu_read_unlock(); 666 out_rel: 667 dst_release(dst); 668 out: 669 return rc; 670 } 671 672 /* Wait for data on the tcp-socket, analyze received data 673 * Returns: 674 * 0 if success and it was not a decline that we received. 675 * SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send. 676 * clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise. 677 */ 678 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen, 679 u8 expected_type, unsigned long timeout) 680 { 681 long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo; 682 struct sock *clc_sk = smc->clcsock->sk; 683 struct smc_clc_msg_hdr *clcm = buf; 684 struct msghdr msg = {NULL, 0}; 685 int reason_code = 0; 686 struct kvec vec = {buf, buflen}; 687 int len, datlen, recvlen; 688 bool check_trl = true; 689 int krflags; 690 691 /* peek the first few bytes to determine length of data to receive 692 * so we don't consume any subsequent CLC message or payload data 693 * in the TCP byte stream 694 */ 695 /* 696 * Caller must make sure that buflen is no less than 697 * sizeof(struct smc_clc_msg_hdr) 698 */ 699 krflags = MSG_PEEK | MSG_WAITALL; 700 clc_sk->sk_rcvtimeo = timeout; 701 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, 702 sizeof(struct smc_clc_msg_hdr)); 703 len = sock_recvmsg(smc->clcsock, &msg, krflags); 704 if (signal_pending(current)) { 705 reason_code = -EINTR; 706 clc_sk->sk_err = EINTR; 707 smc->sk.sk_err = EINTR; 708 goto out; 709 } 710 if (clc_sk->sk_err) { 711 reason_code = -clc_sk->sk_err; 712 if (clc_sk->sk_err == EAGAIN && 713 expected_type == SMC_CLC_DECLINE) 714 clc_sk->sk_err = 0; /* reset for fallback usage */ 715 else 716 smc->sk.sk_err = clc_sk->sk_err; 717 goto out; 718 } 719 if (!len) { /* peer has performed orderly shutdown */ 720 smc->sk.sk_err = ECONNRESET; 721 reason_code = -ECONNRESET; 722 goto out; 723 } 724 if (len < 0) { 725 if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE) 726 smc->sk.sk_err = -len; 727 reason_code = len; 728 goto out; 729 } 730 datlen = ntohs(clcm->length); 731 if ((len < sizeof(struct smc_clc_msg_hdr)) || 732 (clcm->version < SMC_V1) || 733 ((clcm->type != SMC_CLC_DECLINE) && 734 (clcm->type != expected_type))) { 735 smc->sk.sk_err = EPROTO; 736 reason_code = -EPROTO; 737 goto out; 738 } 739 740 /* receive the complete CLC message */ 741 memset(&msg, 0, sizeof(struct msghdr)); 742 if (datlen > buflen) { 743 check_trl = false; 744 recvlen = buflen; 745 } else { 746 recvlen = datlen; 747 } 748 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen); 749 krflags = MSG_WAITALL; 750 len = sock_recvmsg(smc->clcsock, &msg, krflags); 751 if (len < recvlen || !smc_clc_msg_hdr_valid(clcm, check_trl)) { 752 smc->sk.sk_err = EPROTO; 753 reason_code = -EPROTO; 754 goto out; 755 } 756 datlen -= len; 757 while (datlen) { 758 u8 tmp[SMC_CLC_RECV_BUF_LEN]; 759 760 vec.iov_base = &tmp; 761 vec.iov_len = SMC_CLC_RECV_BUF_LEN; 762 /* receive remaining proposal message */ 763 recvlen = datlen > SMC_CLC_RECV_BUF_LEN ? 764 SMC_CLC_RECV_BUF_LEN : datlen; 765 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen); 766 len = sock_recvmsg(smc->clcsock, &msg, krflags); 767 datlen -= len; 768 } 769 if (clcm->type == SMC_CLC_DECLINE) { 770 struct smc_clc_msg_decline *dclc; 771 772 dclc = (struct smc_clc_msg_decline *)clcm; 773 reason_code = SMC_CLC_DECL_PEERDECL; 774 smc->peer_diagnosis = ntohl(dclc->peer_diagnosis); 775 if (((struct smc_clc_msg_decline *)buf)->hdr.typev2 & 776 SMC_FIRST_CONTACT_MASK) { 777 smc->conn.lgr->sync_err = 1; 778 smc_lgr_terminate_sched(smc->conn.lgr); 779 } 780 } 781 782 out: 783 clc_sk->sk_rcvtimeo = rcvtimeo; 784 return reason_code; 785 } 786 787 /* send CLC DECLINE message across internal TCP socket */ 788 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version) 789 { 790 struct smc_clc_msg_decline *dclc_v1; 791 struct smc_clc_msg_decline_v2 dclc; 792 struct msghdr msg; 793 int len, send_len; 794 struct kvec vec; 795 796 dclc_v1 = (struct smc_clc_msg_decline *)&dclc; 797 memset(&dclc, 0, sizeof(dclc)); 798 memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 799 dclc.hdr.type = SMC_CLC_DECLINE; 800 dclc.hdr.version = version; 801 dclc.os_type = version == SMC_V1 ? 0 : SMC_CLC_OS_LINUX; 802 dclc.hdr.typev2 = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ? 803 SMC_FIRST_CONTACT_MASK : 0; 804 if ((!smc_conn_lgr_valid(&smc->conn) || !smc->conn.lgr->is_smcd) && 805 smc_ib_is_valid_local_systemid()) 806 memcpy(dclc.id_for_peer, local_systemid, 807 sizeof(local_systemid)); 808 dclc.peer_diagnosis = htonl(peer_diag_info); 809 if (version == SMC_V1) { 810 memcpy(dclc_v1->trl.eyecatcher, SMC_EYECATCHER, 811 sizeof(SMC_EYECATCHER)); 812 send_len = sizeof(*dclc_v1); 813 } else { 814 memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER, 815 sizeof(SMC_EYECATCHER)); 816 send_len = sizeof(dclc); 817 } 818 dclc.hdr.length = htons(send_len); 819 820 memset(&msg, 0, sizeof(msg)); 821 vec.iov_base = &dclc; 822 vec.iov_len = send_len; 823 len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, send_len); 824 if (len < 0 || len < send_len) 825 len = -EPROTO; 826 return len > 0 ? 0 : len; 827 } 828 829 /* send CLC PROPOSAL message across internal TCP socket */ 830 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini) 831 { 832 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 833 struct smc_clc_msg_proposal_prefix *pclc_prfx; 834 struct smc_clc_msg_proposal *pclc_base; 835 struct smc_clc_smcd_gid_chid *gidchids; 836 struct smc_clc_msg_proposal_area *pclc; 837 struct smc_clc_ipv6_prefix *ipv6_prfx; 838 struct net *net = sock_net(&smc->sk); 839 struct smc_clc_v2_extension *v2_ext; 840 struct smc_clc_msg_smcd *pclc_smcd; 841 struct smc_clc_msg_trail *trl; 842 struct smcd_dev *smcd; 843 int len, i, plen, rc; 844 int reason_code = 0; 845 struct kvec vec[8]; 846 struct msghdr msg; 847 848 pclc = kzalloc(sizeof(*pclc), GFP_KERNEL); 849 if (!pclc) 850 return -ENOMEM; 851 852 pclc_base = &pclc->pclc_base; 853 pclc_smcd = &pclc->pclc_smcd; 854 pclc_prfx = &pclc->pclc_prfx; 855 ipv6_prfx = pclc->pclc_prfx_ipv6; 856 v2_ext = &pclc->pclc_v2_ext; 857 smcd_v2_ext = &pclc->pclc_smcd_v2_ext; 858 gidchids = pclc->pclc_gidchids; 859 trl = &pclc->pclc_trl; 860 861 pclc_base->hdr.version = SMC_V2; 862 pclc_base->hdr.typev1 = ini->smc_type_v1; 863 pclc_base->hdr.typev2 = ini->smc_type_v2; 864 plen = sizeof(*pclc_base) + sizeof(*pclc_smcd) + sizeof(*trl); 865 866 /* retrieve ip prefixes for CLC proposal msg */ 867 if (ini->smc_type_v1 != SMC_TYPE_N) { 868 rc = smc_clc_prfx_set(smc->clcsock, pclc_prfx, ipv6_prfx); 869 if (rc) { 870 if (ini->smc_type_v2 == SMC_TYPE_N) { 871 kfree(pclc); 872 return SMC_CLC_DECL_CNFERR; 873 } 874 pclc_base->hdr.typev1 = SMC_TYPE_N; 875 } else { 876 pclc_base->iparea_offset = htons(sizeof(*pclc_smcd)); 877 plen += sizeof(*pclc_prfx) + 878 pclc_prfx->ipv6_prefixes_cnt * 879 sizeof(ipv6_prfx[0]); 880 } 881 } 882 883 /* build SMC Proposal CLC message */ 884 memcpy(pclc_base->hdr.eyecatcher, SMC_EYECATCHER, 885 sizeof(SMC_EYECATCHER)); 886 pclc_base->hdr.type = SMC_CLC_PROPOSAL; 887 if (smcr_indicated(ini->smc_type_v1)) { 888 /* add SMC-R specifics */ 889 memcpy(pclc_base->lcl.id_for_peer, local_systemid, 890 sizeof(local_systemid)); 891 memcpy(pclc_base->lcl.gid, ini->ib_gid, SMC_GID_SIZE); 892 memcpy(pclc_base->lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1], 893 ETH_ALEN); 894 } 895 if (smcd_indicated(ini->smc_type_v1)) { 896 struct smcd_gid smcd_gid; 897 898 /* add SMC-D specifics */ 899 if (ini->ism_dev[0]) { 900 smcd = ini->ism_dev[0]; 901 smcd->ops->get_local_gid(smcd, &smcd_gid); 902 pclc_smcd->ism.gid = htonll(smcd_gid.gid); 903 pclc_smcd->ism.chid = 904 htons(smc_ism_get_chid(ini->ism_dev[0])); 905 } 906 } 907 if (ini->smc_type_v2 == SMC_TYPE_N) { 908 pclc_smcd->v2_ext_offset = 0; 909 } else { 910 struct smc_clc_eid_entry *ueident; 911 u16 v2_ext_offset; 912 913 v2_ext->hdr.flag.release = SMC_RELEASE; 914 v2_ext_offset = sizeof(*pclc_smcd) - 915 offsetofend(struct smc_clc_msg_smcd, v2_ext_offset); 916 if (ini->smc_type_v1 != SMC_TYPE_N) 917 v2_ext_offset += sizeof(*pclc_prfx) + 918 pclc_prfx->ipv6_prefixes_cnt * 919 sizeof(ipv6_prfx[0]); 920 pclc_smcd->v2_ext_offset = htons(v2_ext_offset); 921 plen += sizeof(*v2_ext); 922 923 v2_ext->feature_mask = htons(SMC_FEATURE_MASK); 924 read_lock(&smc_clc_eid_table.lock); 925 v2_ext->hdr.eid_cnt = smc_clc_eid_table.ueid_cnt; 926 plen += smc_clc_eid_table.ueid_cnt * SMC_MAX_EID_LEN; 927 i = 0; 928 list_for_each_entry(ueident, &smc_clc_eid_table.list, list) { 929 memcpy(v2_ext->user_eids[i++], ueident->eid, 930 sizeof(ueident->eid)); 931 } 932 read_unlock(&smc_clc_eid_table.lock); 933 } 934 if (smcd_indicated(ini->smc_type_v2)) { 935 struct smcd_gid smcd_gid; 936 u8 *eid = NULL; 937 int entry = 0; 938 939 v2_ext->hdr.flag.seid = smc_clc_eid_table.seid_enabled; 940 v2_ext->hdr.smcd_v2_ext_offset = htons(sizeof(*v2_ext) - 941 offsetofend(struct smc_clnt_opts_area_hdr, 942 smcd_v2_ext_offset) + 943 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN); 944 smc_ism_get_system_eid(&eid); 945 if (eid && v2_ext->hdr.flag.seid) 946 memcpy(smcd_v2_ext->system_eid, eid, SMC_MAX_EID_LEN); 947 plen += sizeof(*smcd_v2_ext); 948 if (ini->ism_offered_cnt) { 949 for (i = 1; i <= ini->ism_offered_cnt; i++) { 950 smcd = ini->ism_dev[i]; 951 smcd->ops->get_local_gid(smcd, &smcd_gid); 952 gidchids[entry].chid = 953 htons(smc_ism_get_chid(ini->ism_dev[i])); 954 gidchids[entry].gid = htonll(smcd_gid.gid); 955 if (smc_ism_is_virtual(smcd)) { 956 /* a virtual ISM device takes two 957 * entries. CHID of the second entry 958 * repeats that of the first entry. 959 */ 960 gidchids[entry + 1].chid = 961 gidchids[entry].chid; 962 gidchids[entry + 1].gid = 963 htonll(smcd_gid.gid_ext); 964 entry++; 965 } 966 entry++; 967 } 968 plen += entry * sizeof(struct smc_clc_smcd_gid_chid); 969 } 970 v2_ext->hdr.ism_gid_cnt = entry; 971 } 972 if (smcr_indicated(ini->smc_type_v2)) { 973 memcpy(v2_ext->roce, ini->smcrv2.ib_gid_v2, SMC_GID_SIZE); 974 v2_ext->max_conns = net->smc.sysctl_max_conns_per_lgr; 975 v2_ext->max_links = net->smc.sysctl_max_links_per_lgr; 976 } 977 978 pclc_base->hdr.length = htons(plen); 979 memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 980 981 /* send SMC Proposal CLC message */ 982 memset(&msg, 0, sizeof(msg)); 983 i = 0; 984 vec[i].iov_base = pclc_base; 985 vec[i++].iov_len = sizeof(*pclc_base); 986 vec[i].iov_base = pclc_smcd; 987 vec[i++].iov_len = sizeof(*pclc_smcd); 988 if (ini->smc_type_v1 != SMC_TYPE_N) { 989 vec[i].iov_base = pclc_prfx; 990 vec[i++].iov_len = sizeof(*pclc_prfx); 991 if (pclc_prfx->ipv6_prefixes_cnt > 0) { 992 vec[i].iov_base = ipv6_prfx; 993 vec[i++].iov_len = pclc_prfx->ipv6_prefixes_cnt * 994 sizeof(ipv6_prfx[0]); 995 } 996 } 997 if (ini->smc_type_v2 != SMC_TYPE_N) { 998 vec[i].iov_base = v2_ext; 999 vec[i++].iov_len = sizeof(*v2_ext) + 1000 (v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN); 1001 if (smcd_indicated(ini->smc_type_v2)) { 1002 vec[i].iov_base = smcd_v2_ext; 1003 vec[i++].iov_len = sizeof(*smcd_v2_ext); 1004 if (ini->ism_offered_cnt) { 1005 vec[i].iov_base = gidchids; 1006 vec[i++].iov_len = v2_ext->hdr.ism_gid_cnt * 1007 sizeof(struct smc_clc_smcd_gid_chid); 1008 } 1009 } 1010 } 1011 vec[i].iov_base = trl; 1012 vec[i++].iov_len = sizeof(*trl); 1013 /* due to the few bytes needed for clc-handshake this cannot block */ 1014 len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen); 1015 if (len < 0) { 1016 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1017 reason_code = -smc->sk.sk_err; 1018 } else if (len < ntohs(pclc_base->hdr.length)) { 1019 reason_code = -ENETUNREACH; 1020 smc->sk.sk_err = -reason_code; 1021 } 1022 1023 kfree(pclc); 1024 return reason_code; 1025 } 1026 1027 static void 1028 smcd_clc_prep_confirm_accept(struct smc_connection *conn, 1029 struct smc_clc_msg_accept_confirm *clc, 1030 int first_contact, u8 version, 1031 u8 *eid, struct smc_init_info *ini, 1032 int *fce_len, 1033 struct smc_clc_first_contact_ext_v2x *fce_v2x, 1034 struct smc_clc_msg_trail *trl) 1035 { 1036 struct smcd_dev *smcd = conn->lgr->smcd; 1037 struct smcd_gid smcd_gid; 1038 u16 chid; 1039 int len; 1040 1041 /* SMC-D specific settings */ 1042 memcpy(clc->hdr.eyecatcher, SMCD_EYECATCHER, 1043 sizeof(SMCD_EYECATCHER)); 1044 smcd->ops->get_local_gid(smcd, &smcd_gid); 1045 clc->hdr.typev1 = SMC_TYPE_D; 1046 clc->d0.gid = htonll(smcd_gid.gid); 1047 clc->d0.token = htonll(conn->rmb_desc->token); 1048 clc->d0.dmbe_size = conn->rmbe_size_comp; 1049 clc->d0.dmbe_idx = 0; 1050 memcpy(&clc->d0.linkid, conn->lgr->id, SMC_LGR_ID_SIZE); 1051 if (version == SMC_V1) { 1052 clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN); 1053 } else { 1054 chid = smc_ism_get_chid(smcd); 1055 clc->d1.chid = htons(chid); 1056 if (eid && eid[0]) 1057 memcpy(clc->d1.eid, eid, SMC_MAX_EID_LEN); 1058 if (__smc_ism_is_virtual(chid)) 1059 clc->d1.gid_ext = htonll(smcd_gid.gid_ext); 1060 len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2; 1061 if (first_contact) { 1062 *fce_len = smc_clc_fill_fce_v2x(fce_v2x, ini); 1063 len += *fce_len; 1064 } 1065 clc->hdr.length = htons(len); 1066 } 1067 memcpy(trl->eyecatcher, SMCD_EYECATCHER, 1068 sizeof(SMCD_EYECATCHER)); 1069 } 1070 1071 static void 1072 smcr_clc_prep_confirm_accept(struct smc_connection *conn, 1073 struct smc_clc_msg_accept_confirm *clc, 1074 int first_contact, u8 version, 1075 u8 *eid, struct smc_init_info *ini, 1076 int *fce_len, 1077 struct smc_clc_first_contact_ext_v2x *fce_v2x, 1078 struct smc_clc_fce_gid_ext *gle, 1079 struct smc_clc_msg_trail *trl) 1080 { 1081 struct smc_link *link = conn->lnk; 1082 int len; 1083 1084 /* SMC-R specific settings */ 1085 memcpy(clc->hdr.eyecatcher, SMC_EYECATCHER, 1086 sizeof(SMC_EYECATCHER)); 1087 clc->hdr.typev1 = SMC_TYPE_R; 1088 memcpy(clc->r0.lcl.id_for_peer, local_systemid, 1089 sizeof(local_systemid)); 1090 memcpy(&clc->r0.lcl.gid, link->gid, SMC_GID_SIZE); 1091 memcpy(&clc->r0.lcl.mac, &link->smcibdev->mac[link->ibport - 1], 1092 ETH_ALEN); 1093 hton24(clc->r0.qpn, link->roce_qp->qp_num); 1094 clc->r0.rmb_rkey = 1095 htonl(conn->rmb_desc->mr[link->link_idx]->rkey); 1096 clc->r0.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */ 1097 clc->r0.rmbe_alert_token = htonl(conn->alert_token_local); 1098 switch (clc->hdr.type) { 1099 case SMC_CLC_ACCEPT: 1100 clc->r0.qp_mtu = link->path_mtu; 1101 break; 1102 case SMC_CLC_CONFIRM: 1103 clc->r0.qp_mtu = min(link->path_mtu, link->peer_mtu); 1104 break; 1105 } 1106 clc->r0.rmbe_size = conn->rmbe_size_comp; 1107 clc->r0.rmb_dma_addr = conn->rmb_desc->is_vm ? 1108 cpu_to_be64((uintptr_t)conn->rmb_desc->cpu_addr) : 1109 cpu_to_be64((u64)sg_dma_address 1110 (conn->rmb_desc->sgt[link->link_idx].sgl)); 1111 hton24(clc->r0.psn, link->psn_initial); 1112 if (version == SMC_V1) { 1113 clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN); 1114 } else { 1115 if (eid && eid[0]) 1116 memcpy(clc->r1.eid, eid, SMC_MAX_EID_LEN); 1117 len = SMCR_CLC_ACCEPT_CONFIRM_LEN_V2; 1118 if (first_contact) { 1119 *fce_len = smc_clc_fill_fce_v2x(fce_v2x, ini); 1120 len += *fce_len; 1121 fce_v2x->fce_v2_base.v2_direct = 1122 !link->lgr->uses_gateway; 1123 if (clc->hdr.type == SMC_CLC_CONFIRM) { 1124 memset(gle, 0, sizeof(*gle)); 1125 gle->gid_cnt = ini->smcrv2.gidlist.len; 1126 len += sizeof(*gle); 1127 len += gle->gid_cnt * sizeof(gle->gid[0]); 1128 } 1129 } 1130 clc->hdr.length = htons(len); 1131 } 1132 memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 1133 } 1134 1135 /* build and send CLC CONFIRM / ACCEPT message */ 1136 static int smc_clc_send_confirm_accept(struct smc_sock *smc, 1137 struct smc_clc_msg_accept_confirm *clc, 1138 int first_contact, u8 version, 1139 u8 *eid, struct smc_init_info *ini) 1140 { 1141 struct smc_clc_first_contact_ext_v2x fce_v2x; 1142 struct smc_connection *conn = &smc->conn; 1143 struct smc_clc_fce_gid_ext gle; 1144 struct smc_clc_msg_trail trl; 1145 int i, fce_len; 1146 struct kvec vec[5]; 1147 struct msghdr msg; 1148 1149 /* send SMC Confirm CLC msg */ 1150 clc->hdr.version = version; /* SMC version */ 1151 if (first_contact) 1152 clc->hdr.typev2 |= SMC_FIRST_CONTACT_MASK; 1153 if (conn->lgr->is_smcd) 1154 smcd_clc_prep_confirm_accept(conn, clc, first_contact, 1155 version, eid, ini, &fce_len, 1156 &fce_v2x, &trl); 1157 else 1158 smcr_clc_prep_confirm_accept(conn, clc, first_contact, 1159 version, eid, ini, &fce_len, 1160 &fce_v2x, &gle, &trl); 1161 memset(&msg, 0, sizeof(msg)); 1162 i = 0; 1163 vec[i].iov_base = clc; 1164 if (version > SMC_V1) 1165 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ? 1166 SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 : 1167 SMCR_CLC_ACCEPT_CONFIRM_LEN_V2) - 1168 sizeof(trl); 1169 else 1170 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ? 1171 SMCD_CLC_ACCEPT_CONFIRM_LEN : 1172 SMCR_CLC_ACCEPT_CONFIRM_LEN) - 1173 sizeof(trl); 1174 if (version > SMC_V1 && first_contact) { 1175 vec[i].iov_base = &fce_v2x; 1176 vec[i++].iov_len = fce_len; 1177 if (!conn->lgr->is_smcd) { 1178 if (clc->hdr.type == SMC_CLC_CONFIRM) { 1179 vec[i].iov_base = &gle; 1180 vec[i++].iov_len = sizeof(gle); 1181 vec[i].iov_base = &ini->smcrv2.gidlist.list; 1182 vec[i++].iov_len = gle.gid_cnt * 1183 sizeof(gle.gid[0]); 1184 } 1185 } 1186 } 1187 vec[i].iov_base = &trl; 1188 vec[i++].iov_len = sizeof(trl); 1189 return kernel_sendmsg(smc->clcsock, &msg, vec, 1, 1190 ntohs(clc->hdr.length)); 1191 } 1192 1193 /* send CLC CONFIRM message across internal TCP socket */ 1194 int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact, 1195 u8 version, u8 *eid, struct smc_init_info *ini) 1196 { 1197 struct smc_clc_msg_accept_confirm cclc; 1198 int reason_code = 0; 1199 int len; 1200 1201 /* send SMC Confirm CLC msg */ 1202 memset(&cclc, 0, sizeof(cclc)); 1203 cclc.hdr.type = SMC_CLC_CONFIRM; 1204 len = smc_clc_send_confirm_accept(smc, &cclc, clnt_first_contact, 1205 version, eid, ini); 1206 if (len < ntohs(cclc.hdr.length)) { 1207 if (len >= 0) { 1208 reason_code = -ENETUNREACH; 1209 smc->sk.sk_err = -reason_code; 1210 } else { 1211 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1212 reason_code = -smc->sk.sk_err; 1213 } 1214 } 1215 return reason_code; 1216 } 1217 1218 /* send CLC ACCEPT message across internal TCP socket */ 1219 int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact, 1220 u8 version, u8 *negotiated_eid, struct smc_init_info *ini) 1221 { 1222 struct smc_clc_msg_accept_confirm aclc; 1223 int len; 1224 1225 memset(&aclc, 0, sizeof(aclc)); 1226 aclc.hdr.type = SMC_CLC_ACCEPT; 1227 len = smc_clc_send_confirm_accept(new_smc, &aclc, srv_first_contact, 1228 version, negotiated_eid, ini); 1229 if (len < ntohs(aclc.hdr.length)) 1230 len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err; 1231 1232 return len > 0 ? 0 : len; 1233 } 1234 1235 int smc_clc_srv_v2x_features_validate(struct smc_sock *smc, 1236 struct smc_clc_msg_proposal *pclc, 1237 struct smc_init_info *ini) 1238 { 1239 struct smc_clc_v2_extension *pclc_v2_ext; 1240 struct net *net = sock_net(&smc->sk); 1241 1242 ini->max_conns = SMC_CONN_PER_LGR_MAX; 1243 ini->max_links = SMC_LINKS_ADD_LNK_MAX; 1244 ini->feature_mask = SMC_FEATURE_MASK; 1245 1246 if ((!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) || 1247 ini->release_nr < SMC_RELEASE_1) 1248 return 0; 1249 1250 pclc_v2_ext = smc_get_clc_v2_ext(pclc); 1251 if (!pclc_v2_ext) 1252 return SMC_CLC_DECL_NOV2EXT; 1253 1254 if (ini->smcr_version & SMC_V2) { 1255 ini->max_conns = min_t(u8, pclc_v2_ext->max_conns, 1256 net->smc.sysctl_max_conns_per_lgr); 1257 if (ini->max_conns < SMC_CONN_PER_LGR_MIN) 1258 return SMC_CLC_DECL_MAXCONNERR; 1259 1260 ini->max_links = min_t(u8, pclc_v2_ext->max_links, 1261 net->smc.sysctl_max_links_per_lgr); 1262 if (ini->max_links < SMC_LINKS_ADD_LNK_MIN) 1263 return SMC_CLC_DECL_MAXLINKERR; 1264 } 1265 1266 return 0; 1267 } 1268 1269 int smc_clc_clnt_v2x_features_validate(struct smc_clc_first_contact_ext *fce, 1270 struct smc_init_info *ini) 1271 { 1272 struct smc_clc_first_contact_ext_v2x *fce_v2x = 1273 (struct smc_clc_first_contact_ext_v2x *)fce; 1274 1275 if (ini->release_nr < SMC_RELEASE_1) 1276 return 0; 1277 1278 if (!ini->is_smcd) { 1279 if (fce_v2x->max_conns < SMC_CONN_PER_LGR_MIN) 1280 return SMC_CLC_DECL_MAXCONNERR; 1281 ini->max_conns = fce_v2x->max_conns; 1282 1283 if (fce_v2x->max_links > SMC_LINKS_ADD_LNK_MAX || 1284 fce_v2x->max_links < SMC_LINKS_ADD_LNK_MIN) 1285 return SMC_CLC_DECL_MAXLINKERR; 1286 ini->max_links = fce_v2x->max_links; 1287 } 1288 /* common supplemental features of server and client */ 1289 ini->feature_mask = ntohs(fce_v2x->feature_mask) & SMC_FEATURE_MASK; 1290 1291 return 0; 1292 } 1293 1294 int smc_clc_v2x_features_confirm_check(struct smc_clc_msg_accept_confirm *cclc, 1295 struct smc_init_info *ini) 1296 { 1297 struct smc_clc_first_contact_ext *fce = 1298 smc_get_clc_first_contact_ext(cclc, ini->is_smcd); 1299 struct smc_clc_first_contact_ext_v2x *fce_v2x = 1300 (struct smc_clc_first_contact_ext_v2x *)fce; 1301 1302 if (cclc->hdr.version == SMC_V1 || 1303 !(cclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) 1304 return 0; 1305 1306 if (ini->release_nr != fce->release) 1307 return SMC_CLC_DECL_RELEASEERR; 1308 1309 if (fce->release < SMC_RELEASE_1) 1310 return 0; 1311 1312 if (!ini->is_smcd) { 1313 if (fce_v2x->max_conns != ini->max_conns) 1314 return SMC_CLC_DECL_MAXCONNERR; 1315 if (fce_v2x->max_links != ini->max_links) 1316 return SMC_CLC_DECL_MAXLINKERR; 1317 } 1318 /* common supplemental features returned by client */ 1319 ini->feature_mask = ntohs(fce_v2x->feature_mask); 1320 1321 return 0; 1322 } 1323 1324 void smc_clc_get_hostname(u8 **host) 1325 { 1326 *host = &smc_hostname[0]; 1327 } 1328 1329 void __init smc_clc_init(void) 1330 { 1331 struct new_utsname *u; 1332 1333 memset(smc_hostname, _S, sizeof(smc_hostname)); /* ASCII blanks */ 1334 u = utsname(); 1335 memcpy(smc_hostname, u->nodename, 1336 min_t(size_t, strlen(u->nodename), sizeof(smc_hostname))); 1337 1338 INIT_LIST_HEAD(&smc_clc_eid_table.list); 1339 rwlock_init(&smc_clc_eid_table.lock); 1340 smc_clc_eid_table.ueid_cnt = 0; 1341 #if IS_ENABLED(CONFIG_S390) 1342 smc_clc_eid_table.seid_enabled = 1; 1343 #else 1344 smc_clc_eid_table.seid_enabled = 0; 1345 #endif 1346 } 1347 1348 void smc_clc_exit(void) 1349 { 1350 smc_clc_ueid_remove(NULL); 1351 } 1352