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 net_device *dev, __be32 ipv4, 513 struct smc_clc_msg_proposal_prefix *prop) 514 { 515 struct in_device *in_dev = __in_dev_get_rcu(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 net_device *dev, 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(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 sockaddr_storage addrs; 568 struct sockaddr_in6 *addr6; 569 struct sockaddr_in *addr; 570 struct net_device *dev; 571 struct dst_entry *dst; 572 int rc = -ENOENT; 573 574 /* get address to which the internal TCP socket is bound */ 575 if (kernel_getsockname(clcsock, (struct sockaddr *)&addrs) < 0) 576 goto out; 577 578 /* analyze IP specific data of net_device belonging to TCP socket */ 579 addr6 = (struct sockaddr_in6 *)&addrs; 580 581 rcu_read_lock(); 582 583 dst = __sk_dst_get(clcsock->sk); 584 dev = dst ? dst_dev_rcu(dst) : NULL; 585 if (!dev) { 586 rc = -ENODEV; 587 goto out_unlock; 588 } 589 590 if (addrs.ss_family == PF_INET) { 591 /* IPv4 */ 592 addr = (struct sockaddr_in *)&addrs; 593 rc = smc_clc_prfx_set4_rcu(dev, addr->sin_addr.s_addr, prop); 594 } else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) { 595 /* mapped IPv4 address - peer is IPv4 only */ 596 rc = smc_clc_prfx_set4_rcu(dev, addr6->sin6_addr.s6_addr32[3], 597 prop); 598 } else { 599 /* IPv6 */ 600 rc = smc_clc_prfx_set6_rcu(dev, prop, ipv6_prfx); 601 } 602 603 out_unlock: 604 rcu_read_unlock(); 605 out: 606 return rc; 607 } 608 609 /* match ipv4 addrs of dev against addr in CLC proposal */ 610 static int smc_clc_prfx_match4_rcu(struct net_device *dev, 611 struct smc_clc_msg_proposal_prefix *prop) 612 { 613 struct in_device *in_dev = __in_dev_get_rcu(dev); 614 const struct in_ifaddr *ifa; 615 616 if (!in_dev) 617 return -ENODEV; 618 in_dev_for_each_ifa_rcu(ifa, in_dev) { 619 if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) && 620 inet_ifa_match(prop->outgoing_subnet, ifa)) 621 return 0; 622 } 623 624 return -ENOENT; 625 } 626 627 /* match ipv6 addrs of dev against addrs in CLC proposal */ 628 static int smc_clc_prfx_match6_rcu(struct net_device *dev, 629 struct smc_clc_msg_proposal_prefix *prop) 630 { 631 #if IS_ENABLED(CONFIG_IPV6) 632 struct inet6_dev *in6_dev = __in6_dev_get(dev); 633 struct smc_clc_ipv6_prefix *ipv6_prfx; 634 struct inet6_ifaddr *ifa; 635 int i, max; 636 637 if (!in6_dev) 638 return -ENODEV; 639 /* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */ 640 ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop)); 641 max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX); 642 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) { 643 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL) 644 continue; 645 for (i = 0; i < max; i++) { 646 if (ifa->prefix_len == ipv6_prfx[i].prefix_len && 647 ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix, 648 ifa->prefix_len)) 649 return 0; 650 } 651 } 652 #endif 653 return -ENOENT; 654 } 655 656 /* check if proposed prefixes match one of our device prefixes */ 657 int smc_clc_prfx_match(struct socket *clcsock, 658 struct smc_clc_msg_proposal_prefix *prop) 659 { 660 struct net_device *dev; 661 struct dst_entry *dst; 662 int rc; 663 664 rcu_read_lock(); 665 666 dst = __sk_dst_get(clcsock->sk); 667 dev = dst ? dst_dev_rcu(dst) : NULL; 668 if (!dev) { 669 rc = -ENODEV; 670 goto out; 671 } 672 673 if (!prop->ipv6_prefixes_cnt) 674 rc = smc_clc_prfx_match4_rcu(dev, prop); 675 else 676 rc = smc_clc_prfx_match6_rcu(dev, prop); 677 out: 678 rcu_read_unlock(); 679 680 return rc; 681 } 682 683 /* Wait for data on the tcp-socket, analyze received data 684 * Returns: 685 * 0 if success and it was not a decline that we received. 686 * SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send. 687 * clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise. 688 */ 689 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen, 690 u8 expected_type, unsigned long timeout) 691 { 692 long rcvtimeo = READ_ONCE(smc->clcsock->sk->sk_rcvtimeo); 693 struct sock *clc_sk = smc->clcsock->sk; 694 struct smc_clc_msg_hdr *clcm = buf; 695 struct msghdr msg = {NULL, 0}; 696 int reason_code = 0; 697 struct kvec vec = {buf, buflen}; 698 int len, datlen, recvlen; 699 bool check_trl = true; 700 int krflags; 701 702 /* peek the first few bytes to determine length of data to receive 703 * so we don't consume any subsequent CLC message or payload data 704 * in the TCP byte stream 705 */ 706 /* 707 * Caller must make sure that buflen is no less than 708 * sizeof(struct smc_clc_msg_hdr) 709 */ 710 krflags = MSG_PEEK | MSG_WAITALL; 711 WRITE_ONCE(clc_sk->sk_rcvtimeo, timeout); 712 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, 713 sizeof(struct smc_clc_msg_hdr)); 714 len = sock_recvmsg(smc->clcsock, &msg, krflags); 715 if (signal_pending(current)) { 716 reason_code = -EINTR; 717 clc_sk->sk_err = EINTR; 718 smc->sk.sk_err = EINTR; 719 goto out; 720 } 721 if (clc_sk->sk_err) { 722 reason_code = -clc_sk->sk_err; 723 if (clc_sk->sk_err == EAGAIN && 724 expected_type == SMC_CLC_DECLINE) 725 clc_sk->sk_err = 0; /* reset for fallback usage */ 726 else 727 smc->sk.sk_err = clc_sk->sk_err; 728 goto out; 729 } 730 if (!len) { /* peer has performed orderly shutdown */ 731 smc->sk.sk_err = ECONNRESET; 732 reason_code = -ECONNRESET; 733 goto out; 734 } 735 if (len < 0) { 736 if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE) 737 smc->sk.sk_err = -len; 738 reason_code = len; 739 goto out; 740 } 741 datlen = ntohs(clcm->length); 742 if ((len < sizeof(struct smc_clc_msg_hdr)) || 743 (clcm->version < SMC_V1) || 744 ((clcm->type != SMC_CLC_DECLINE) && 745 (clcm->type != expected_type))) { 746 smc->sk.sk_err = EPROTO; 747 reason_code = -EPROTO; 748 goto out; 749 } 750 751 /* receive the complete CLC message */ 752 memset(&msg, 0, sizeof(struct msghdr)); 753 if (datlen > buflen) { 754 check_trl = false; 755 recvlen = buflen; 756 } else { 757 recvlen = datlen; 758 } 759 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen); 760 krflags = MSG_WAITALL; 761 len = sock_recvmsg(smc->clcsock, &msg, krflags); 762 if (len < recvlen || !smc_clc_msg_hdr_valid(clcm, check_trl)) { 763 smc->sk.sk_err = EPROTO; 764 reason_code = -EPROTO; 765 goto out; 766 } 767 datlen -= len; 768 while (datlen) { 769 u8 tmp[SMC_CLC_RECV_BUF_LEN]; 770 771 vec.iov_base = &tmp; 772 vec.iov_len = SMC_CLC_RECV_BUF_LEN; 773 /* receive remaining proposal message */ 774 recvlen = datlen > SMC_CLC_RECV_BUF_LEN ? 775 SMC_CLC_RECV_BUF_LEN : datlen; 776 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen); 777 len = sock_recvmsg(smc->clcsock, &msg, krflags); 778 if (len < recvlen) { 779 smc->sk.sk_err = EPROTO; 780 reason_code = -EPROTO; 781 goto out; 782 } 783 datlen -= len; 784 } 785 if (clcm->type == SMC_CLC_DECLINE) { 786 struct smc_clc_msg_decline *dclc; 787 788 dclc = (struct smc_clc_msg_decline *)clcm; 789 reason_code = SMC_CLC_DECL_PEERDECL; 790 smc->peer_diagnosis = ntohl(dclc->peer_diagnosis); 791 if (((struct smc_clc_msg_decline *)buf)->hdr.typev2 & 792 SMC_FIRST_CONTACT_MASK) { 793 smc->conn.lgr->sync_err = 1; 794 smc_lgr_terminate_sched(smc->conn.lgr); 795 } 796 } 797 798 out: 799 WRITE_ONCE(clc_sk->sk_rcvtimeo, rcvtimeo); 800 return reason_code; 801 } 802 803 /* send CLC DECLINE message across internal TCP socket */ 804 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version) 805 { 806 struct smc_clc_msg_decline *dclc_v1; 807 struct smc_clc_msg_decline_v2 dclc; 808 struct msghdr msg; 809 int len, send_len; 810 struct kvec vec; 811 812 dclc_v1 = (struct smc_clc_msg_decline *)&dclc; 813 memset(&dclc, 0, sizeof(dclc)); 814 memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 815 dclc.hdr.type = SMC_CLC_DECLINE; 816 dclc.hdr.version = version; 817 dclc.os_type = version == SMC_V1 ? 0 : SMC_CLC_OS_LINUX; 818 dclc.hdr.typev2 = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ? 819 SMC_FIRST_CONTACT_MASK : 0; 820 if ((!smc_conn_lgr_valid(&smc->conn) || !smc->conn.lgr->is_smcd) && 821 smc_ib_is_valid_local_systemid()) 822 memcpy(dclc.id_for_peer, local_systemid, 823 sizeof(local_systemid)); 824 dclc.peer_diagnosis = htonl(peer_diag_info); 825 if (version == SMC_V1) { 826 memcpy(dclc_v1->trl.eyecatcher, SMC_EYECATCHER, 827 sizeof(SMC_EYECATCHER)); 828 send_len = sizeof(*dclc_v1); 829 } else { 830 memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER, 831 sizeof(SMC_EYECATCHER)); 832 send_len = sizeof(dclc); 833 } 834 dclc.hdr.length = htons(send_len); 835 836 memset(&msg, 0, sizeof(msg)); 837 vec.iov_base = &dclc; 838 vec.iov_len = send_len; 839 len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, send_len); 840 if (len < 0 || len < send_len) 841 len = -EPROTO; 842 return len > 0 ? 0 : len; 843 } 844 845 /* send CLC PROPOSAL message across internal TCP socket */ 846 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini) 847 { 848 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 849 struct smc_clc_msg_proposal_prefix *pclc_prfx; 850 struct smc_clc_msg_proposal *pclc_base; 851 struct smc_clc_smcd_gid_chid *gidchids; 852 struct smc_clc_msg_proposal_area *pclc; 853 struct smc_clc_ipv6_prefix *ipv6_prfx; 854 struct net *net = sock_net(&smc->sk); 855 struct smc_clc_v2_extension *v2_ext; 856 struct smc_clc_msg_smcd *pclc_smcd; 857 struct smc_clc_msg_trail *trl; 858 struct smcd_dev *smcd; 859 int len, i, plen, rc; 860 int reason_code = 0; 861 struct kvec vec[8]; 862 struct msghdr msg; 863 864 pclc = kzalloc(sizeof(*pclc), GFP_KERNEL); 865 if (!pclc) 866 return -ENOMEM; 867 868 pclc_base = &pclc->pclc_base; 869 pclc_smcd = &pclc->pclc_smcd; 870 pclc_prfx = &pclc->pclc_prfx; 871 ipv6_prfx = pclc->pclc_prfx_ipv6; 872 v2_ext = container_of(&pclc->pclc_v2_ext, 873 struct smc_clc_v2_extension, fixed); 874 smcd_v2_ext = container_of(&pclc->pclc_smcd_v2_ext, 875 struct smc_clc_smcd_v2_extension, fixed); 876 gidchids = pclc->pclc_gidchids; 877 trl = &pclc->pclc_trl; 878 879 pclc_base->hdr.version = SMC_V2; 880 pclc_base->hdr.typev1 = ini->smc_type_v1; 881 pclc_base->hdr.typev2 = ini->smc_type_v2; 882 plen = sizeof(*pclc_base) + sizeof(*pclc_smcd) + sizeof(*trl); 883 884 /* retrieve ip prefixes for CLC proposal msg */ 885 if (ini->smc_type_v1 != SMC_TYPE_N) { 886 rc = smc_clc_prfx_set(smc->clcsock, pclc_prfx, ipv6_prfx); 887 if (rc) { 888 if (ini->smc_type_v2 == SMC_TYPE_N) { 889 kfree(pclc); 890 return SMC_CLC_DECL_CNFERR; 891 } 892 pclc_base->hdr.typev1 = SMC_TYPE_N; 893 } else { 894 pclc_base->iparea_offset = htons(sizeof(*pclc_smcd)); 895 plen += sizeof(*pclc_prfx) + 896 pclc_prfx->ipv6_prefixes_cnt * 897 sizeof(ipv6_prfx[0]); 898 } 899 } 900 901 /* build SMC Proposal CLC message */ 902 memcpy(pclc_base->hdr.eyecatcher, SMC_EYECATCHER, 903 sizeof(SMC_EYECATCHER)); 904 pclc_base->hdr.type = SMC_CLC_PROPOSAL; 905 if (smcr_indicated(ini->smc_type_v1)) { 906 /* add SMC-R specifics */ 907 memcpy(pclc_base->lcl.id_for_peer, local_systemid, 908 sizeof(local_systemid)); 909 memcpy(pclc_base->lcl.gid, ini->ib_gid, SMC_GID_SIZE); 910 memcpy(pclc_base->lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1], 911 ETH_ALEN); 912 } 913 if (smcd_indicated(ini->smc_type_v1)) { 914 struct smcd_gid smcd_gid; 915 916 /* add SMC-D specifics */ 917 if (ini->ism_dev[0]) { 918 smcd = ini->ism_dev[0]; 919 copy_to_smcdgid(&smcd_gid, &smcd->dibs->gid); 920 pclc_smcd->ism.gid = htonll(smcd_gid.gid); 921 pclc_smcd->ism.chid = 922 htons(smc_ism_get_chid(ini->ism_dev[0])); 923 } 924 } 925 if (ini->smc_type_v2 == SMC_TYPE_N) { 926 pclc_smcd->v2_ext_offset = 0; 927 } else { 928 struct smc_clc_eid_entry *ueident; 929 u16 v2_ext_offset; 930 931 v2_ext->hdr.flag.release = SMC_RELEASE; 932 v2_ext_offset = sizeof(*pclc_smcd) - 933 offsetofend(struct smc_clc_msg_smcd, v2_ext_offset); 934 if (ini->smc_type_v1 != SMC_TYPE_N) 935 v2_ext_offset += sizeof(*pclc_prfx) + 936 pclc_prfx->ipv6_prefixes_cnt * 937 sizeof(ipv6_prfx[0]); 938 pclc_smcd->v2_ext_offset = htons(v2_ext_offset); 939 plen += sizeof(*v2_ext); 940 941 v2_ext->feature_mask = htons(SMC_FEATURE_MASK); 942 read_lock(&smc_clc_eid_table.lock); 943 v2_ext->hdr.eid_cnt = smc_clc_eid_table.ueid_cnt; 944 plen += smc_clc_eid_table.ueid_cnt * SMC_MAX_EID_LEN; 945 i = 0; 946 list_for_each_entry(ueident, &smc_clc_eid_table.list, list) { 947 memcpy(v2_ext->user_eids[i++], ueident->eid, 948 sizeof(ueident->eid)); 949 } 950 read_unlock(&smc_clc_eid_table.lock); 951 } 952 if (smcd_indicated(ini->smc_type_v2)) { 953 struct smcd_gid smcd_gid; 954 u8 *eid = NULL; 955 int entry = 0; 956 957 v2_ext->hdr.flag.seid = smc_clc_eid_table.seid_enabled; 958 v2_ext->hdr.smcd_v2_ext_offset = htons(sizeof(*v2_ext) - 959 offsetofend(struct smc_clnt_opts_area_hdr, 960 smcd_v2_ext_offset) + 961 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN); 962 smc_ism_get_system_eid(&eid); 963 if (eid && v2_ext->hdr.flag.seid) 964 memcpy(smcd_v2_ext->system_eid, eid, SMC_MAX_EID_LEN); 965 plen += sizeof(*smcd_v2_ext); 966 if (ini->ism_offered_cnt) { 967 for (i = 1; i <= ini->ism_offered_cnt; i++) { 968 smcd = ini->ism_dev[i]; 969 copy_to_smcdgid(&smcd_gid, &smcd->dibs->gid); 970 gidchids[entry].chid = 971 htons(smc_ism_get_chid(ini->ism_dev[i])); 972 gidchids[entry].gid = htonll(smcd_gid.gid); 973 if (smc_ism_is_emulated(smcd)) { 974 /* an Emulated-ISM device takes two 975 * entries. CHID of the second entry 976 * repeats that of the first entry. 977 */ 978 gidchids[entry + 1].chid = 979 gidchids[entry].chid; 980 gidchids[entry + 1].gid = 981 htonll(smcd_gid.gid_ext); 982 entry++; 983 } 984 entry++; 985 } 986 plen += entry * sizeof(struct smc_clc_smcd_gid_chid); 987 } 988 v2_ext->hdr.ism_gid_cnt = entry; 989 } 990 if (smcr_indicated(ini->smc_type_v2)) { 991 memcpy(v2_ext->roce, ini->smcrv2.ib_gid_v2, SMC_GID_SIZE); 992 v2_ext->max_conns = net->smc.sysctl_max_conns_per_lgr; 993 v2_ext->max_links = net->smc.sysctl_max_links_per_lgr; 994 } 995 996 pclc_base->hdr.length = htons(plen); 997 memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 998 999 /* send SMC Proposal CLC message */ 1000 memset(&msg, 0, sizeof(msg)); 1001 i = 0; 1002 vec[i].iov_base = pclc_base; 1003 vec[i++].iov_len = sizeof(*pclc_base); 1004 vec[i].iov_base = pclc_smcd; 1005 vec[i++].iov_len = sizeof(*pclc_smcd); 1006 if (ini->smc_type_v1 != SMC_TYPE_N) { 1007 vec[i].iov_base = pclc_prfx; 1008 vec[i++].iov_len = sizeof(*pclc_prfx); 1009 if (pclc_prfx->ipv6_prefixes_cnt > 0) { 1010 vec[i].iov_base = ipv6_prfx; 1011 vec[i++].iov_len = pclc_prfx->ipv6_prefixes_cnt * 1012 sizeof(ipv6_prfx[0]); 1013 } 1014 } 1015 if (ini->smc_type_v2 != SMC_TYPE_N) { 1016 vec[i].iov_base = v2_ext; 1017 vec[i++].iov_len = sizeof(*v2_ext) + 1018 (v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN); 1019 if (smcd_indicated(ini->smc_type_v2)) { 1020 vec[i].iov_base = smcd_v2_ext; 1021 vec[i++].iov_len = sizeof(*smcd_v2_ext); 1022 if (ini->ism_offered_cnt) { 1023 vec[i].iov_base = gidchids; 1024 vec[i++].iov_len = v2_ext->hdr.ism_gid_cnt * 1025 sizeof(struct smc_clc_smcd_gid_chid); 1026 } 1027 } 1028 } 1029 vec[i].iov_base = trl; 1030 vec[i++].iov_len = sizeof(*trl); 1031 /* due to the few bytes needed for clc-handshake this cannot block */ 1032 len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen); 1033 if (len < 0) { 1034 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1035 reason_code = -smc->sk.sk_err; 1036 } else if (len < ntohs(pclc_base->hdr.length)) { 1037 reason_code = -ENETUNREACH; 1038 smc->sk.sk_err = -reason_code; 1039 } 1040 1041 kfree(pclc); 1042 return reason_code; 1043 } 1044 1045 static void 1046 smcd_clc_prep_confirm_accept(struct smc_connection *conn, 1047 struct smc_clc_msg_accept_confirm *clc, 1048 int first_contact, u8 version, 1049 u8 *eid, struct smc_init_info *ini, 1050 int *fce_len, 1051 struct smc_clc_first_contact_ext_v2x *fce_v2x, 1052 struct smc_clc_msg_trail *trl) 1053 { 1054 struct smcd_dev *smcd = conn->lgr->smcd; 1055 struct smcd_gid smcd_gid; 1056 u16 chid; 1057 int len; 1058 1059 /* SMC-D specific settings */ 1060 memcpy(clc->hdr.eyecatcher, SMCD_EYECATCHER, 1061 sizeof(SMCD_EYECATCHER)); 1062 copy_to_smcdgid(&smcd_gid, &smcd->dibs->gid); 1063 clc->hdr.typev1 = SMC_TYPE_D; 1064 clc->d0.gid = htonll(smcd_gid.gid); 1065 clc->d0.token = htonll(conn->rmb_desc->token); 1066 clc->d0.dmbe_size = conn->rmbe_size_comp; 1067 clc->d0.dmbe_idx = 0; 1068 memcpy(&clc->d0.linkid, conn->lgr->id, SMC_LGR_ID_SIZE); 1069 if (version == SMC_V1) { 1070 clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN); 1071 } else { 1072 chid = smc_ism_get_chid(smcd); 1073 clc->d1.chid = htons(chid); 1074 if (eid && eid[0]) 1075 memcpy(clc->d1.eid, eid, SMC_MAX_EID_LEN); 1076 if (__smc_ism_is_emulated(chid)) 1077 clc->d1.gid_ext = htonll(smcd_gid.gid_ext); 1078 len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2; 1079 if (first_contact) { 1080 *fce_len = smc_clc_fill_fce_v2x(fce_v2x, ini); 1081 len += *fce_len; 1082 } 1083 clc->hdr.length = htons(len); 1084 } 1085 memcpy(trl->eyecatcher, SMCD_EYECATCHER, 1086 sizeof(SMCD_EYECATCHER)); 1087 } 1088 1089 static void 1090 smcr_clc_prep_confirm_accept(struct smc_connection *conn, 1091 struct smc_clc_msg_accept_confirm *clc, 1092 int first_contact, u8 version, 1093 u8 *eid, struct smc_init_info *ini, 1094 int *fce_len, 1095 struct smc_clc_first_contact_ext_v2x *fce_v2x, 1096 struct smc_clc_fce_gid_ext *gle, 1097 struct smc_clc_msg_trail *trl) 1098 { 1099 struct smc_link *link = conn->lnk; 1100 int len; 1101 1102 /* SMC-R specific settings */ 1103 memcpy(clc->hdr.eyecatcher, SMC_EYECATCHER, 1104 sizeof(SMC_EYECATCHER)); 1105 clc->hdr.typev1 = SMC_TYPE_R; 1106 memcpy(clc->r0.lcl.id_for_peer, local_systemid, 1107 sizeof(local_systemid)); 1108 memcpy(&clc->r0.lcl.gid, link->gid, SMC_GID_SIZE); 1109 memcpy(&clc->r0.lcl.mac, &link->smcibdev->mac[link->ibport - 1], 1110 ETH_ALEN); 1111 hton24(clc->r0.qpn, link->roce_qp->qp_num); 1112 clc->r0.rmb_rkey = 1113 htonl(conn->rmb_desc->mr[link->link_idx]->rkey); 1114 clc->r0.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */ 1115 clc->r0.rmbe_alert_token = htonl(conn->alert_token_local); 1116 switch (clc->hdr.type) { 1117 case SMC_CLC_ACCEPT: 1118 clc->r0.qp_mtu = link->path_mtu; 1119 break; 1120 case SMC_CLC_CONFIRM: 1121 clc->r0.qp_mtu = min(link->path_mtu, link->peer_mtu); 1122 break; 1123 } 1124 clc->r0.rmbe_size = conn->rmbe_size_comp; 1125 clc->r0.rmb_dma_addr = conn->rmb_desc->is_vm ? 1126 cpu_to_be64((uintptr_t)conn->rmb_desc->cpu_addr) : 1127 cpu_to_be64((u64)sg_dma_address 1128 (conn->rmb_desc->sgt[link->link_idx].sgl)); 1129 hton24(clc->r0.psn, link->psn_initial); 1130 if (version == SMC_V1) { 1131 clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN); 1132 } else { 1133 if (eid && eid[0]) 1134 memcpy(clc->r1.eid, eid, SMC_MAX_EID_LEN); 1135 len = SMCR_CLC_ACCEPT_CONFIRM_LEN_V2; 1136 if (first_contact) { 1137 *fce_len = smc_clc_fill_fce_v2x(fce_v2x, ini); 1138 len += *fce_len; 1139 fce_v2x->fce_v2_base.v2_direct = 1140 !link->lgr->uses_gateway; 1141 if (clc->hdr.type == SMC_CLC_CONFIRM) { 1142 memset(gle, 0, sizeof(*gle)); 1143 gle->gid_cnt = ini->smcrv2.gidlist.len; 1144 len += sizeof(*gle); 1145 len += gle->gid_cnt * sizeof(gle->gid[0]); 1146 } 1147 } 1148 clc->hdr.length = htons(len); 1149 } 1150 memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 1151 } 1152 1153 /* build and send CLC CONFIRM / ACCEPT message */ 1154 static int smc_clc_send_confirm_accept(struct smc_sock *smc, 1155 struct smc_clc_msg_accept_confirm *clc, 1156 int first_contact, u8 version, 1157 u8 *eid, struct smc_init_info *ini) 1158 { 1159 struct smc_clc_first_contact_ext_v2x fce_v2x; 1160 struct smc_connection *conn = &smc->conn; 1161 struct smc_clc_fce_gid_ext gle; 1162 struct smc_clc_msg_trail trl; 1163 int i, fce_len; 1164 struct kvec vec[5]; 1165 struct msghdr msg; 1166 1167 /* send SMC Confirm CLC msg */ 1168 clc->hdr.version = version; /* SMC version */ 1169 if (first_contact) 1170 clc->hdr.typev2 |= SMC_FIRST_CONTACT_MASK; 1171 if (conn->lgr->is_smcd) 1172 smcd_clc_prep_confirm_accept(conn, clc, first_contact, 1173 version, eid, ini, &fce_len, 1174 &fce_v2x, &trl); 1175 else 1176 smcr_clc_prep_confirm_accept(conn, clc, first_contact, 1177 version, eid, ini, &fce_len, 1178 &fce_v2x, &gle, &trl); 1179 memset(&msg, 0, sizeof(msg)); 1180 i = 0; 1181 vec[i].iov_base = clc; 1182 if (version > SMC_V1) 1183 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ? 1184 SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 : 1185 SMCR_CLC_ACCEPT_CONFIRM_LEN_V2) - 1186 sizeof(trl); 1187 else 1188 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ? 1189 SMCD_CLC_ACCEPT_CONFIRM_LEN : 1190 SMCR_CLC_ACCEPT_CONFIRM_LEN) - 1191 sizeof(trl); 1192 if (version > SMC_V1 && first_contact) { 1193 vec[i].iov_base = &fce_v2x; 1194 vec[i++].iov_len = fce_len; 1195 if (!conn->lgr->is_smcd) { 1196 if (clc->hdr.type == SMC_CLC_CONFIRM) { 1197 vec[i].iov_base = &gle; 1198 vec[i++].iov_len = sizeof(gle); 1199 vec[i].iov_base = &ini->smcrv2.gidlist.list; 1200 vec[i++].iov_len = gle.gid_cnt * 1201 sizeof(gle.gid[0]); 1202 } 1203 } 1204 } 1205 vec[i].iov_base = &trl; 1206 vec[i++].iov_len = sizeof(trl); 1207 return kernel_sendmsg(smc->clcsock, &msg, vec, 1, 1208 ntohs(clc->hdr.length)); 1209 } 1210 1211 /* send CLC CONFIRM message across internal TCP socket */ 1212 int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact, 1213 u8 version, u8 *eid, struct smc_init_info *ini) 1214 { 1215 struct smc_clc_msg_accept_confirm cclc; 1216 int reason_code = 0; 1217 int len; 1218 1219 /* send SMC Confirm CLC msg */ 1220 memset(&cclc, 0, sizeof(cclc)); 1221 cclc.hdr.type = SMC_CLC_CONFIRM; 1222 len = smc_clc_send_confirm_accept(smc, &cclc, clnt_first_contact, 1223 version, eid, ini); 1224 if (len < ntohs(cclc.hdr.length)) { 1225 if (len >= 0) { 1226 reason_code = -ENETUNREACH; 1227 smc->sk.sk_err = -reason_code; 1228 } else { 1229 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1230 reason_code = -smc->sk.sk_err; 1231 } 1232 } 1233 return reason_code; 1234 } 1235 1236 /* send CLC ACCEPT message across internal TCP socket */ 1237 int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact, 1238 u8 version, u8 *negotiated_eid, struct smc_init_info *ini) 1239 { 1240 struct smc_clc_msg_accept_confirm aclc; 1241 int len; 1242 1243 memset(&aclc, 0, sizeof(aclc)); 1244 aclc.hdr.type = SMC_CLC_ACCEPT; 1245 len = smc_clc_send_confirm_accept(new_smc, &aclc, srv_first_contact, 1246 version, negotiated_eid, ini); 1247 if (len < ntohs(aclc.hdr.length)) 1248 len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err; 1249 1250 return len > 0 ? 0 : len; 1251 } 1252 1253 int smc_clc_srv_v2x_features_validate(struct smc_sock *smc, 1254 struct smc_clc_msg_proposal *pclc, 1255 struct smc_init_info *ini) 1256 { 1257 struct smc_clc_v2_extension *pclc_v2_ext; 1258 struct net *net = sock_net(&smc->sk); 1259 1260 ini->max_conns = SMC_CONN_PER_LGR_MAX; 1261 ini->max_links = SMC_LINKS_ADD_LNK_MAX; 1262 ini->feature_mask = SMC_FEATURE_MASK; 1263 1264 if ((!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) || 1265 ini->release_nr < SMC_RELEASE_1) 1266 return 0; 1267 1268 pclc_v2_ext = smc_get_clc_v2_ext(pclc); 1269 if (!pclc_v2_ext) 1270 return SMC_CLC_DECL_NOV2EXT; 1271 1272 if (ini->smcr_version & SMC_V2) { 1273 ini->max_conns = min_t(u8, pclc_v2_ext->max_conns, 1274 net->smc.sysctl_max_conns_per_lgr); 1275 if (ini->max_conns < SMC_CONN_PER_LGR_MIN) 1276 return SMC_CLC_DECL_MAXCONNERR; 1277 1278 ini->max_links = min_t(u8, pclc_v2_ext->max_links, 1279 net->smc.sysctl_max_links_per_lgr); 1280 if (ini->max_links < SMC_LINKS_ADD_LNK_MIN) 1281 return SMC_CLC_DECL_MAXLINKERR; 1282 } 1283 1284 return 0; 1285 } 1286 1287 int smc_clc_clnt_v2x_features_validate(struct smc_clc_first_contact_ext *fce, 1288 struct smc_init_info *ini) 1289 { 1290 struct smc_clc_first_contact_ext_v2x *fce_v2x = 1291 (struct smc_clc_first_contact_ext_v2x *)fce; 1292 1293 if (ini->release_nr < SMC_RELEASE_1) 1294 return 0; 1295 1296 if (!ini->is_smcd) { 1297 if (fce_v2x->max_conns < SMC_CONN_PER_LGR_MIN) 1298 return SMC_CLC_DECL_MAXCONNERR; 1299 ini->max_conns = fce_v2x->max_conns; 1300 1301 if (fce_v2x->max_links > SMC_LINKS_ADD_LNK_MAX || 1302 fce_v2x->max_links < SMC_LINKS_ADD_LNK_MIN) 1303 return SMC_CLC_DECL_MAXLINKERR; 1304 ini->max_links = fce_v2x->max_links; 1305 } 1306 /* common supplemental features of server and client */ 1307 ini->feature_mask = ntohs(fce_v2x->feature_mask) & SMC_FEATURE_MASK; 1308 1309 return 0; 1310 } 1311 1312 int smc_clc_v2x_features_confirm_check(struct smc_clc_msg_accept_confirm *cclc, 1313 struct smc_init_info *ini) 1314 { 1315 struct smc_clc_first_contact_ext *fce = 1316 smc_get_clc_first_contact_ext(cclc, ini->is_smcd); 1317 struct smc_clc_first_contact_ext_v2x *fce_v2x = 1318 (struct smc_clc_first_contact_ext_v2x *)fce; 1319 1320 if (cclc->hdr.version == SMC_V1 || 1321 !(cclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) 1322 return 0; 1323 1324 if (ini->release_nr != fce->release) 1325 return SMC_CLC_DECL_RELEASEERR; 1326 1327 if (fce->release < SMC_RELEASE_1) 1328 return 0; 1329 1330 if (!ini->is_smcd) { 1331 if (fce_v2x->max_conns != ini->max_conns) 1332 return SMC_CLC_DECL_MAXCONNERR; 1333 if (fce_v2x->max_links != ini->max_links) 1334 return SMC_CLC_DECL_MAXLINKERR; 1335 } 1336 /* common supplemental features returned by client */ 1337 ini->feature_mask = ntohs(fce_v2x->feature_mask); 1338 1339 return 0; 1340 } 1341 1342 void smc_clc_get_hostname(u8 **host) 1343 { 1344 *host = &smc_hostname[0]; 1345 } 1346 1347 void __init smc_clc_init(void) 1348 { 1349 struct new_utsname *u; 1350 1351 memset(smc_hostname, _S, sizeof(smc_hostname)); /* ASCII blanks */ 1352 u = utsname(); 1353 memcpy(smc_hostname, u->nodename, 1354 min_t(size_t, strlen(u->nodename), sizeof(smc_hostname))); 1355 1356 INIT_LIST_HEAD(&smc_clc_eid_table.list); 1357 rwlock_init(&smc_clc_eid_table.lock); 1358 smc_clc_eid_table.ueid_cnt = 0; 1359 #if IS_ENABLED(CONFIG_S390) 1360 smc_clc_eid_table.seid_enabled = 1; 1361 #else 1362 smc_clc_eid_table.seid_enabled = 0; 1363 #endif 1364 } 1365 1366 void smc_clc_exit(void) 1367 { 1368 smc_clc_ueid_remove(NULL); 1369 } 1370