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 */ 38static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'}; 39/* eye catcher "SMCD" EBCDIC for CLC messages */ 40static const char SMCD_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xc4'}; 41 42static u8 smc_hostname[SMC_MAX_HOSTNAME_LEN]; 43 44struct smc_clc_eid_table { 45 rwlock_t lock; 46 struct list_head list; 47 u8 ueid_cnt; 48 u8 seid_enabled; 49}; 50 51static struct smc_clc_eid_table smc_clc_eid_table; 52 53struct 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 */ 63static 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 82static 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 112err_out: 113 write_unlock(&smc_clc_eid_table.lock); 114 kfree(new_ueid); 115 return rc; 116} 117 118int 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 129int 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 */ 142static 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 168int 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 180int smc_nl_flush_ueid(struct sk_buff *skb, struct genl_info *info) 181{ 182 smc_clc_ueid_remove(NULL); 183 return 0; 184} 185 186static 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 206static 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 226int 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 238int 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; 267end: 268 genlmsg_end(skb, hdr); 269 cb_ctx->pos[0]++; 270 return skb->len; 271err: 272 genlmsg_cancel(skb, hdr); 273 return -EMSGSIZE; 274} 275 276int 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 288int 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 305static 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 316bool 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 } 342out: 343 read_unlock(&smc_clc_eid_table.lock); 344 return match; 345} 346 347/* check arriving CLC proposal */ 348static 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 */ 389static bool 390smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm_v2 *clc_v2) 391{ 392 struct smc_clc_msg_hdr *hdr = &clc_v2->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 */ 414static bool 415smc_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 431static int smc_clc_fill_fce(struct smc_clc_first_contact_ext_v2x *fce, 432 struct smc_init_info *ini) 433{ 434 int ret = sizeof(*fce); 435 436 memset(fce, 0, sizeof(*fce)); 437 fce->fce_v2_base.os_type = SMC_CLC_OS_LINUX; 438 fce->fce_v2_base.release = ini->release_nr; 439 memcpy(fce->fce_v2_base.hostname, smc_hostname, sizeof(smc_hostname)); 440 if (ini->is_smcd && ini->release_nr < SMC_RELEASE_1) { 441 ret = sizeof(struct smc_clc_first_contact_ext); 442 goto out; 443 } 444 445 if (ini->release_nr >= SMC_RELEASE_1) { 446 if (!ini->is_smcd) { 447 fce->max_conns = ini->max_conns; 448 fce->max_links = ini->max_links; 449 } 450 } 451 452out: 453 return ret; 454} 455 456/* check if received message has a correct header length and contains valid 457 * heading and trailing eyecatchers 458 */ 459static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl) 460{ 461 struct smc_clc_msg_accept_confirm_v2 *clc_v2; 462 struct smc_clc_msg_proposal *pclc; 463 struct smc_clc_msg_decline *dclc; 464 struct smc_clc_msg_trail *trl; 465 466 if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) && 467 memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER))) 468 return false; 469 switch (clcm->type) { 470 case SMC_CLC_PROPOSAL: 471 pclc = (struct smc_clc_msg_proposal *)clcm; 472 if (!smc_clc_msg_prop_valid(pclc)) 473 return false; 474 trl = (struct smc_clc_msg_trail *) 475 ((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl)); 476 break; 477 case SMC_CLC_ACCEPT: 478 case SMC_CLC_CONFIRM: 479 clc_v2 = (struct smc_clc_msg_accept_confirm_v2 *)clcm; 480 if (!smc_clc_msg_acc_conf_valid(clc_v2)) 481 return false; 482 trl = (struct smc_clc_msg_trail *) 483 ((u8 *)clc_v2 + ntohs(clc_v2->hdr.length) - 484 sizeof(*trl)); 485 break; 486 case SMC_CLC_DECLINE: 487 dclc = (struct smc_clc_msg_decline *)clcm; 488 if (!smc_clc_msg_decl_valid(dclc)) 489 return false; 490 check_trl = false; 491 break; 492 default: 493 return false; 494 } 495 if (check_trl && 496 memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) && 497 memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER))) 498 return false; 499 return true; 500} 501 502/* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */ 503static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4, 504 struct smc_clc_msg_proposal_prefix *prop) 505{ 506 struct in_device *in_dev = __in_dev_get_rcu(dst->dev); 507 const struct in_ifaddr *ifa; 508 509 if (!in_dev) 510 return -ENODEV; 511 512 in_dev_for_each_ifa_rcu(ifa, in_dev) { 513 if (!inet_ifa_match(ipv4, ifa)) 514 continue; 515 prop->prefix_len = inet_mask_len(ifa->ifa_mask); 516 prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask; 517 /* prop->ipv6_prefixes_cnt = 0; already done by memset before */ 518 return 0; 519 } 520 return -ENOENT; 521} 522 523/* fill CLC proposal msg with ipv6 prefixes from device */ 524static int smc_clc_prfx_set6_rcu(struct dst_entry *dst, 525 struct smc_clc_msg_proposal_prefix *prop, 526 struct smc_clc_ipv6_prefix *ipv6_prfx) 527{ 528#if IS_ENABLED(CONFIG_IPV6) 529 struct inet6_dev *in6_dev = __in6_dev_get(dst->dev); 530 struct inet6_ifaddr *ifa; 531 int cnt = 0; 532 533 if (!in6_dev) 534 return -ENODEV; 535 /* use a maximum of 8 IPv6 prefixes from device */ 536 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) { 537 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL) 538 continue; 539 ipv6_addr_prefix(&ipv6_prfx[cnt].prefix, 540 &ifa->addr, ifa->prefix_len); 541 ipv6_prfx[cnt].prefix_len = ifa->prefix_len; 542 cnt++; 543 if (cnt == SMC_CLC_MAX_V6_PREFIX) 544 break; 545 } 546 prop->ipv6_prefixes_cnt = cnt; 547 if (cnt) 548 return 0; 549#endif 550 return -ENOENT; 551} 552 553/* retrieve and set prefixes in CLC proposal msg */ 554static int smc_clc_prfx_set(struct socket *clcsock, 555 struct smc_clc_msg_proposal_prefix *prop, 556 struct smc_clc_ipv6_prefix *ipv6_prfx) 557{ 558 struct dst_entry *dst = sk_dst_get(clcsock->sk); 559 struct sockaddr_storage addrs; 560 struct sockaddr_in6 *addr6; 561 struct sockaddr_in *addr; 562 int rc = -ENOENT; 563 564 if (!dst) { 565 rc = -ENOTCONN; 566 goto out; 567 } 568 if (!dst->dev) { 569 rc = -ENODEV; 570 goto out_rel; 571 } 572 /* get address to which the internal TCP socket is bound */ 573 if (kernel_getsockname(clcsock, (struct sockaddr *)&addrs) < 0) 574 goto out_rel; 575 /* analyze IP specific data of net_device belonging to TCP socket */ 576 addr6 = (struct sockaddr_in6 *)&addrs; 577 rcu_read_lock(); 578 if (addrs.ss_family == PF_INET) { 579 /* IPv4 */ 580 addr = (struct sockaddr_in *)&addrs; 581 rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop); 582 } else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) { 583 /* mapped IPv4 address - peer is IPv4 only */ 584 rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3], 585 prop); 586 } else { 587 /* IPv6 */ 588 rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx); 589 } 590 rcu_read_unlock(); 591out_rel: 592 dst_release(dst); 593out: 594 return rc; 595} 596 597/* match ipv4 addrs of dev against addr in CLC proposal */ 598static int smc_clc_prfx_match4_rcu(struct net_device *dev, 599 struct smc_clc_msg_proposal_prefix *prop) 600{ 601 struct in_device *in_dev = __in_dev_get_rcu(dev); 602 const struct in_ifaddr *ifa; 603 604 if (!in_dev) 605 return -ENODEV; 606 in_dev_for_each_ifa_rcu(ifa, in_dev) { 607 if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) && 608 inet_ifa_match(prop->outgoing_subnet, ifa)) 609 return 0; 610 } 611 612 return -ENOENT; 613} 614 615/* match ipv6 addrs of dev against addrs in CLC proposal */ 616static int smc_clc_prfx_match6_rcu(struct net_device *dev, 617 struct smc_clc_msg_proposal_prefix *prop) 618{ 619#if IS_ENABLED(CONFIG_IPV6) 620 struct inet6_dev *in6_dev = __in6_dev_get(dev); 621 struct smc_clc_ipv6_prefix *ipv6_prfx; 622 struct inet6_ifaddr *ifa; 623 int i, max; 624 625 if (!in6_dev) 626 return -ENODEV; 627 /* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */ 628 ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop)); 629 max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX); 630 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) { 631 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL) 632 continue; 633 for (i = 0; i < max; i++) { 634 if (ifa->prefix_len == ipv6_prfx[i].prefix_len && 635 ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix, 636 ifa->prefix_len)) 637 return 0; 638 } 639 } 640#endif 641 return -ENOENT; 642} 643 644/* check if proposed prefixes match one of our device prefixes */ 645int smc_clc_prfx_match(struct socket *clcsock, 646 struct smc_clc_msg_proposal_prefix *prop) 647{ 648 struct dst_entry *dst = sk_dst_get(clcsock->sk); 649 int rc; 650 651 if (!dst) { 652 rc = -ENOTCONN; 653 goto out; 654 } 655 if (!dst->dev) { 656 rc = -ENODEV; 657 goto out_rel; 658 } 659 rcu_read_lock(); 660 if (!prop->ipv6_prefixes_cnt) 661 rc = smc_clc_prfx_match4_rcu(dst->dev, prop); 662 else 663 rc = smc_clc_prfx_match6_rcu(dst->dev, prop); 664 rcu_read_unlock(); 665out_rel: 666 dst_release(dst); 667out: 668 return rc; 669} 670 671/* Wait for data on the tcp-socket, analyze received data 672 * Returns: 673 * 0 if success and it was not a decline that we received. 674 * SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send. 675 * clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise. 676 */ 677int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen, 678 u8 expected_type, unsigned long timeout) 679{ 680 long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo; 681 struct sock *clc_sk = smc->clcsock->sk; 682 struct smc_clc_msg_hdr *clcm = buf; 683 struct msghdr msg = {NULL, 0}; 684 int reason_code = 0; 685 struct kvec vec = {buf, buflen}; 686 int len, datlen, recvlen; 687 bool check_trl = true; 688 int krflags; 689 690 /* peek the first few bytes to determine length of data to receive 691 * so we don't consume any subsequent CLC message or payload data 692 * in the TCP byte stream 693 */ 694 /* 695 * Caller must make sure that buflen is no less than 696 * sizeof(struct smc_clc_msg_hdr) 697 */ 698 krflags = MSG_PEEK | MSG_WAITALL; 699 clc_sk->sk_rcvtimeo = timeout; 700 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, 701 sizeof(struct smc_clc_msg_hdr)); 702 len = sock_recvmsg(smc->clcsock, &msg, krflags); 703 if (signal_pending(current)) { 704 reason_code = -EINTR; 705 clc_sk->sk_err = EINTR; 706 smc->sk.sk_err = EINTR; 707 goto out; 708 } 709 if (clc_sk->sk_err) { 710 reason_code = -clc_sk->sk_err; 711 if (clc_sk->sk_err == EAGAIN && 712 expected_type == SMC_CLC_DECLINE) 713 clc_sk->sk_err = 0; /* reset for fallback usage */ 714 else 715 smc->sk.sk_err = clc_sk->sk_err; 716 goto out; 717 } 718 if (!len) { /* peer has performed orderly shutdown */ 719 smc->sk.sk_err = ECONNRESET; 720 reason_code = -ECONNRESET; 721 goto out; 722 } 723 if (len < 0) { 724 if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE) 725 smc->sk.sk_err = -len; 726 reason_code = len; 727 goto out; 728 } 729 datlen = ntohs(clcm->length); 730 if ((len < sizeof(struct smc_clc_msg_hdr)) || 731 (clcm->version < SMC_V1) || 732 ((clcm->type != SMC_CLC_DECLINE) && 733 (clcm->type != expected_type))) { 734 smc->sk.sk_err = EPROTO; 735 reason_code = -EPROTO; 736 goto out; 737 } 738 739 /* receive the complete CLC message */ 740 memset(&msg, 0, sizeof(struct msghdr)); 741 if (datlen > buflen) { 742 check_trl = false; 743 recvlen = buflen; 744 } else { 745 recvlen = datlen; 746 } 747 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen); 748 krflags = MSG_WAITALL; 749 len = sock_recvmsg(smc->clcsock, &msg, krflags); 750 if (len < recvlen || !smc_clc_msg_hdr_valid(clcm, check_trl)) { 751 smc->sk.sk_err = EPROTO; 752 reason_code = -EPROTO; 753 goto out; 754 } 755 datlen -= len; 756 while (datlen) { 757 u8 tmp[SMC_CLC_RECV_BUF_LEN]; 758 759 vec.iov_base = &tmp; 760 vec.iov_len = SMC_CLC_RECV_BUF_LEN; 761 /* receive remaining proposal message */ 762 recvlen = datlen > SMC_CLC_RECV_BUF_LEN ? 763 SMC_CLC_RECV_BUF_LEN : datlen; 764 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen); 765 len = sock_recvmsg(smc->clcsock, &msg, krflags); 766 datlen -= len; 767 } 768 if (clcm->type == SMC_CLC_DECLINE) { 769 struct smc_clc_msg_decline *dclc; 770 771 dclc = (struct smc_clc_msg_decline *)clcm; 772 reason_code = SMC_CLC_DECL_PEERDECL; 773 smc->peer_diagnosis = ntohl(dclc->peer_diagnosis); 774 if (((struct smc_clc_msg_decline *)buf)->hdr.typev2 & 775 SMC_FIRST_CONTACT_MASK) { 776 smc->conn.lgr->sync_err = 1; 777 smc_lgr_terminate_sched(smc->conn.lgr); 778 } 779 } 780 781out: 782 clc_sk->sk_rcvtimeo = rcvtimeo; 783 return reason_code; 784} 785 786/* send CLC DECLINE message across internal TCP socket */ 787int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version) 788{ 789 struct smc_clc_msg_decline *dclc_v1; 790 struct smc_clc_msg_decline_v2 dclc; 791 struct msghdr msg; 792 int len, send_len; 793 struct kvec vec; 794 795 dclc_v1 = (struct smc_clc_msg_decline *)&dclc; 796 memset(&dclc, 0, sizeof(dclc)); 797 memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 798 dclc.hdr.type = SMC_CLC_DECLINE; 799 dclc.hdr.version = version; 800 dclc.os_type = version == SMC_V1 ? 0 : SMC_CLC_OS_LINUX; 801 dclc.hdr.typev2 = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ? 802 SMC_FIRST_CONTACT_MASK : 0; 803 if ((!smc_conn_lgr_valid(&smc->conn) || !smc->conn.lgr->is_smcd) && 804 smc_ib_is_valid_local_systemid()) 805 memcpy(dclc.id_for_peer, local_systemid, 806 sizeof(local_systemid)); 807 dclc.peer_diagnosis = htonl(peer_diag_info); 808 if (version == SMC_V1) { 809 memcpy(dclc_v1->trl.eyecatcher, SMC_EYECATCHER, 810 sizeof(SMC_EYECATCHER)); 811 send_len = sizeof(*dclc_v1); 812 } else { 813 memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER, 814 sizeof(SMC_EYECATCHER)); 815 send_len = sizeof(dclc); 816 } 817 dclc.hdr.length = htons(send_len); 818 819 memset(&msg, 0, sizeof(msg)); 820 vec.iov_base = &dclc; 821 vec.iov_len = send_len; 822 len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, send_len); 823 if (len < 0 || len < send_len) 824 len = -EPROTO; 825 return len > 0 ? 0 : len; 826} 827 828/* send CLC PROPOSAL message across internal TCP socket */ 829int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini) 830{ 831 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 832 struct smc_clc_msg_proposal_prefix *pclc_prfx; 833 struct smc_clc_msg_proposal *pclc_base; 834 struct smc_clc_smcd_gid_chid *gidchids; 835 struct smc_clc_msg_proposal_area *pclc; 836 struct smc_clc_ipv6_prefix *ipv6_prfx; 837 struct smc_clc_v2_extension *v2_ext; 838 struct smc_clc_msg_smcd *pclc_smcd; 839 struct smc_clc_msg_trail *trl; 840 struct smcd_dev *smcd; 841 int len, i, plen, rc; 842 int reason_code = 0; 843 struct kvec vec[8]; 844 struct msghdr msg; 845 846 pclc = kzalloc(sizeof(*pclc), GFP_KERNEL); 847 if (!pclc) 848 return -ENOMEM; 849 850 pclc_base = &pclc->pclc_base; 851 pclc_smcd = &pclc->pclc_smcd; 852 pclc_prfx = &pclc->pclc_prfx; 853 ipv6_prfx = pclc->pclc_prfx_ipv6; 854 v2_ext = &pclc->pclc_v2_ext; 855 smcd_v2_ext = &pclc->pclc_smcd_v2_ext; 856 gidchids = pclc->pclc_gidchids; 857 trl = &pclc->pclc_trl; 858 859 pclc_base->hdr.version = SMC_V2; 860 pclc_base->hdr.typev1 = ini->smc_type_v1; 861 pclc_base->hdr.typev2 = ini->smc_type_v2; 862 plen = sizeof(*pclc_base) + sizeof(*pclc_smcd) + sizeof(*trl); 863 864 /* retrieve ip prefixes for CLC proposal msg */ 865 if (ini->smc_type_v1 != SMC_TYPE_N) { 866 rc = smc_clc_prfx_set(smc->clcsock, pclc_prfx, ipv6_prfx); 867 if (rc) { 868 if (ini->smc_type_v2 == SMC_TYPE_N) { 869 kfree(pclc); 870 return SMC_CLC_DECL_CNFERR; 871 } 872 pclc_base->hdr.typev1 = SMC_TYPE_N; 873 } else { 874 pclc_base->iparea_offset = htons(sizeof(*pclc_smcd)); 875 plen += sizeof(*pclc_prfx) + 876 pclc_prfx->ipv6_prefixes_cnt * 877 sizeof(ipv6_prfx[0]); 878 } 879 } 880 881 /* build SMC Proposal CLC message */ 882 memcpy(pclc_base->hdr.eyecatcher, SMC_EYECATCHER, 883 sizeof(SMC_EYECATCHER)); 884 pclc_base->hdr.type = SMC_CLC_PROPOSAL; 885 if (smcr_indicated(ini->smc_type_v1)) { 886 /* add SMC-R specifics */ 887 memcpy(pclc_base->lcl.id_for_peer, local_systemid, 888 sizeof(local_systemid)); 889 memcpy(pclc_base->lcl.gid, ini->ib_gid, SMC_GID_SIZE); 890 memcpy(pclc_base->lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1], 891 ETH_ALEN); 892 } 893 if (smcd_indicated(ini->smc_type_v1)) { 894 /* add SMC-D specifics */ 895 if (ini->ism_dev[0]) { 896 smcd = ini->ism_dev[0]; 897 pclc_smcd->ism.gid = 898 htonll(smcd->ops->get_local_gid(smcd)); 899 pclc_smcd->ism.chid = 900 htons(smc_ism_get_chid(ini->ism_dev[0])); 901 } 902 } 903 if (ini->smc_type_v2 == SMC_TYPE_N) { 904 pclc_smcd->v2_ext_offset = 0; 905 } else { 906 struct smc_clc_eid_entry *ueident; 907 u16 v2_ext_offset; 908 909 v2_ext->hdr.flag.release = SMC_RELEASE; 910 v2_ext_offset = sizeof(*pclc_smcd) - 911 offsetofend(struct smc_clc_msg_smcd, v2_ext_offset); 912 if (ini->smc_type_v1 != SMC_TYPE_N) 913 v2_ext_offset += sizeof(*pclc_prfx) + 914 pclc_prfx->ipv6_prefixes_cnt * 915 sizeof(ipv6_prfx[0]); 916 pclc_smcd->v2_ext_offset = htons(v2_ext_offset); 917 plen += sizeof(*v2_ext); 918 919 read_lock(&smc_clc_eid_table.lock); 920 v2_ext->hdr.eid_cnt = smc_clc_eid_table.ueid_cnt; 921 plen += smc_clc_eid_table.ueid_cnt * SMC_MAX_EID_LEN; 922 i = 0; 923 list_for_each_entry(ueident, &smc_clc_eid_table.list, list) { 924 memcpy(v2_ext->user_eids[i++], ueident->eid, 925 sizeof(ueident->eid)); 926 } 927 read_unlock(&smc_clc_eid_table.lock); 928 } 929 if (smcd_indicated(ini->smc_type_v2)) { 930 u8 *eid = NULL; 931 932 v2_ext->hdr.flag.seid = smc_clc_eid_table.seid_enabled; 933 v2_ext->hdr.ism_gid_cnt = ini->ism_offered_cnt; 934 v2_ext->hdr.smcd_v2_ext_offset = htons(sizeof(*v2_ext) - 935 offsetofend(struct smc_clnt_opts_area_hdr, 936 smcd_v2_ext_offset) + 937 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN); 938 smc_ism_get_system_eid(&eid); 939 if (eid && v2_ext->hdr.flag.seid) 940 memcpy(smcd_v2_ext->system_eid, eid, SMC_MAX_EID_LEN); 941 plen += sizeof(*smcd_v2_ext); 942 if (ini->ism_offered_cnt) { 943 for (i = 1; i <= ini->ism_offered_cnt; i++) { 944 smcd = ini->ism_dev[i]; 945 gidchids[i - 1].gid = 946 htonll(smcd->ops->get_local_gid(smcd)); 947 gidchids[i - 1].chid = 948 htons(smc_ism_get_chid(ini->ism_dev[i])); 949 } 950 plen += ini->ism_offered_cnt * 951 sizeof(struct smc_clc_smcd_gid_chid); 952 } 953 } 954 if (smcr_indicated(ini->smc_type_v2)) { 955 memcpy(v2_ext->roce, ini->smcrv2.ib_gid_v2, SMC_GID_SIZE); 956 v2_ext->max_conns = SMC_CONN_PER_LGR_PREFER; 957 v2_ext->max_links = SMC_LINKS_PER_LGR_MAX_PREFER; 958 } 959 960 pclc_base->hdr.length = htons(plen); 961 memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 962 963 /* send SMC Proposal CLC message */ 964 memset(&msg, 0, sizeof(msg)); 965 i = 0; 966 vec[i].iov_base = pclc_base; 967 vec[i++].iov_len = sizeof(*pclc_base); 968 vec[i].iov_base = pclc_smcd; 969 vec[i++].iov_len = sizeof(*pclc_smcd); 970 if (ini->smc_type_v1 != SMC_TYPE_N) { 971 vec[i].iov_base = pclc_prfx; 972 vec[i++].iov_len = sizeof(*pclc_prfx); 973 if (pclc_prfx->ipv6_prefixes_cnt > 0) { 974 vec[i].iov_base = ipv6_prfx; 975 vec[i++].iov_len = pclc_prfx->ipv6_prefixes_cnt * 976 sizeof(ipv6_prfx[0]); 977 } 978 } 979 if (ini->smc_type_v2 != SMC_TYPE_N) { 980 vec[i].iov_base = v2_ext; 981 vec[i++].iov_len = sizeof(*v2_ext) + 982 (v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN); 983 if (smcd_indicated(ini->smc_type_v2)) { 984 vec[i].iov_base = smcd_v2_ext; 985 vec[i++].iov_len = sizeof(*smcd_v2_ext); 986 if (ini->ism_offered_cnt) { 987 vec[i].iov_base = gidchids; 988 vec[i++].iov_len = ini->ism_offered_cnt * 989 sizeof(struct smc_clc_smcd_gid_chid); 990 } 991 } 992 } 993 vec[i].iov_base = trl; 994 vec[i++].iov_len = sizeof(*trl); 995 /* due to the few bytes needed for clc-handshake this cannot block */ 996 len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen); 997 if (len < 0) { 998 smc->sk.sk_err = smc->clcsock->sk->sk_err; 999 reason_code = -smc->sk.sk_err; 1000 } else if (len < ntohs(pclc_base->hdr.length)) { 1001 reason_code = -ENETUNREACH; 1002 smc->sk.sk_err = -reason_code; 1003 } 1004 1005 kfree(pclc); 1006 return reason_code; 1007} 1008 1009/* build and send CLC CONFIRM / ACCEPT message */ 1010static int smc_clc_send_confirm_accept(struct smc_sock *smc, 1011 struct smc_clc_msg_accept_confirm_v2 *clc_v2, 1012 int first_contact, u8 version, 1013 u8 *eid, struct smc_init_info *ini) 1014{ 1015 struct smc_connection *conn = &smc->conn; 1016 struct smc_clc_first_contact_ext_v2x fce; 1017 struct smcd_dev *smcd = conn->lgr->smcd; 1018 struct smc_clc_msg_accept_confirm *clc; 1019 struct smc_clc_fce_gid_ext gle; 1020 struct smc_clc_msg_trail trl; 1021 int i, len, fce_len; 1022 struct kvec vec[5]; 1023 struct msghdr msg; 1024 1025 /* send SMC Confirm CLC msg */ 1026 clc = (struct smc_clc_msg_accept_confirm *)clc_v2; 1027 clc->hdr.version = version; /* SMC version */ 1028 if (first_contact) 1029 clc->hdr.typev2 |= SMC_FIRST_CONTACT_MASK; 1030 if (conn->lgr->is_smcd) { 1031 /* SMC-D specific settings */ 1032 memcpy(clc->hdr.eyecatcher, SMCD_EYECATCHER, 1033 sizeof(SMCD_EYECATCHER)); 1034 clc->hdr.typev1 = SMC_TYPE_D; 1035 clc->d0.gid = htonll(smcd->ops->get_local_gid(smcd)); 1036 clc->d0.token = htonll(conn->rmb_desc->token); 1037 clc->d0.dmbe_size = conn->rmbe_size_comp; 1038 clc->d0.dmbe_idx = 0; 1039 memcpy(&clc->d0.linkid, conn->lgr->id, SMC_LGR_ID_SIZE); 1040 if (version == SMC_V1) { 1041 clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN); 1042 } else { 1043 clc_v2->d1.chid = htons(smc_ism_get_chid(smcd)); 1044 if (eid && eid[0]) 1045 memcpy(clc_v2->d1.eid, eid, SMC_MAX_EID_LEN); 1046 len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2; 1047 if (first_contact) { 1048 fce_len = smc_clc_fill_fce(&fce, ini); 1049 len += fce_len; 1050 } 1051 clc_v2->hdr.length = htons(len); 1052 } 1053 memcpy(trl.eyecatcher, SMCD_EYECATCHER, 1054 sizeof(SMCD_EYECATCHER)); 1055 } else { 1056 struct smc_link *link = conn->lnk; 1057 1058 /* SMC-R specific settings */ 1059 memcpy(clc->hdr.eyecatcher, SMC_EYECATCHER, 1060 sizeof(SMC_EYECATCHER)); 1061 clc->hdr.typev1 = SMC_TYPE_R; 1062 clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN); 1063 memcpy(clc->r0.lcl.id_for_peer, local_systemid, 1064 sizeof(local_systemid)); 1065 memcpy(&clc->r0.lcl.gid, link->gid, SMC_GID_SIZE); 1066 memcpy(&clc->r0.lcl.mac, &link->smcibdev->mac[link->ibport - 1], 1067 ETH_ALEN); 1068 hton24(clc->r0.qpn, link->roce_qp->qp_num); 1069 clc->r0.rmb_rkey = 1070 htonl(conn->rmb_desc->mr[link->link_idx]->rkey); 1071 clc->r0.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */ 1072 clc->r0.rmbe_alert_token = htonl(conn->alert_token_local); 1073 switch (clc->hdr.type) { 1074 case SMC_CLC_ACCEPT: 1075 clc->r0.qp_mtu = link->path_mtu; 1076 break; 1077 case SMC_CLC_CONFIRM: 1078 clc->r0.qp_mtu = min(link->path_mtu, link->peer_mtu); 1079 break; 1080 } 1081 clc->r0.rmbe_size = conn->rmbe_size_comp; 1082 clc->r0.rmb_dma_addr = conn->rmb_desc->is_vm ? 1083 cpu_to_be64((uintptr_t)conn->rmb_desc->cpu_addr) : 1084 cpu_to_be64((u64)sg_dma_address 1085 (conn->rmb_desc->sgt[link->link_idx].sgl)); 1086 hton24(clc->r0.psn, link->psn_initial); 1087 if (version == SMC_V1) { 1088 clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN); 1089 } else { 1090 if (eid && eid[0]) 1091 memcpy(clc_v2->r1.eid, eid, SMC_MAX_EID_LEN); 1092 len = SMCR_CLC_ACCEPT_CONFIRM_LEN_V2; 1093 if (first_contact) { 1094 fce_len = smc_clc_fill_fce(&fce, ini); 1095 len += fce_len; 1096 fce.fce_v2_base.v2_direct = !link->lgr->uses_gateway; 1097 if (clc->hdr.type == SMC_CLC_CONFIRM) { 1098 memset(&gle, 0, sizeof(gle)); 1099 gle.gid_cnt = ini->smcrv2.gidlist.len; 1100 len += sizeof(gle); 1101 len += gle.gid_cnt * sizeof(gle.gid[0]); 1102 } 1103 } 1104 clc_v2->hdr.length = htons(len); 1105 } 1106 memcpy(trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 1107 } 1108 1109 memset(&msg, 0, sizeof(msg)); 1110 i = 0; 1111 vec[i].iov_base = clc_v2; 1112 if (version > SMC_V1) 1113 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ? 1114 SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 : 1115 SMCR_CLC_ACCEPT_CONFIRM_LEN_V2) - 1116 sizeof(trl); 1117 else 1118 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ? 1119 SMCD_CLC_ACCEPT_CONFIRM_LEN : 1120 SMCR_CLC_ACCEPT_CONFIRM_LEN) - 1121 sizeof(trl); 1122 if (version > SMC_V1 && first_contact) { 1123 vec[i].iov_base = &fce; 1124 vec[i++].iov_len = fce_len; 1125 if (!conn->lgr->is_smcd) { 1126 if (clc->hdr.type == SMC_CLC_CONFIRM) { 1127 vec[i].iov_base = &gle; 1128 vec[i++].iov_len = sizeof(gle); 1129 vec[i].iov_base = &ini->smcrv2.gidlist.list; 1130 vec[i++].iov_len = gle.gid_cnt * 1131 sizeof(gle.gid[0]); 1132 } 1133 } 1134 } 1135 vec[i].iov_base = &trl; 1136 vec[i++].iov_len = sizeof(trl); 1137 return kernel_sendmsg(smc->clcsock, &msg, vec, 1, 1138 ntohs(clc->hdr.length)); 1139} 1140 1141/* send CLC CONFIRM message across internal TCP socket */ 1142int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact, 1143 u8 version, u8 *eid, struct smc_init_info *ini) 1144{ 1145 struct smc_clc_msg_accept_confirm_v2 cclc_v2; 1146 int reason_code = 0; 1147 int len; 1148 1149 /* send SMC Confirm CLC msg */ 1150 memset(&cclc_v2, 0, sizeof(cclc_v2)); 1151 cclc_v2.hdr.type = SMC_CLC_CONFIRM; 1152 len = smc_clc_send_confirm_accept(smc, &cclc_v2, clnt_first_contact, 1153 version, eid, ini); 1154 if (len < ntohs(cclc_v2.hdr.length)) { 1155 if (len >= 0) { 1156 reason_code = -ENETUNREACH; 1157 smc->sk.sk_err = -reason_code; 1158 } else { 1159 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1160 reason_code = -smc->sk.sk_err; 1161 } 1162 } 1163 return reason_code; 1164} 1165 1166/* send CLC ACCEPT message across internal TCP socket */ 1167int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact, 1168 u8 version, u8 *negotiated_eid, struct smc_init_info *ini) 1169{ 1170 struct smc_clc_msg_accept_confirm_v2 aclc_v2; 1171 int len; 1172 1173 memset(&aclc_v2, 0, sizeof(aclc_v2)); 1174 aclc_v2.hdr.type = SMC_CLC_ACCEPT; 1175 len = smc_clc_send_confirm_accept(new_smc, &aclc_v2, srv_first_contact, 1176 version, negotiated_eid, ini); 1177 if (len < ntohs(aclc_v2.hdr.length)) 1178 len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err; 1179 1180 return len > 0 ? 0 : len; 1181} 1182 1183int smc_clc_srv_v2x_features_validate(struct smc_clc_msg_proposal *pclc, 1184 struct smc_init_info *ini) 1185{ 1186 struct smc_clc_v2_extension *pclc_v2_ext; 1187 1188 ini->max_conns = SMC_CONN_PER_LGR_MAX; 1189 ini->max_links = SMC_LINKS_ADD_LNK_MAX; 1190 1191 if ((!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) || 1192 ini->release_nr < SMC_RELEASE_1) 1193 return 0; 1194 1195 pclc_v2_ext = smc_get_clc_v2_ext(pclc); 1196 if (!pclc_v2_ext) 1197 return SMC_CLC_DECL_NOV2EXT; 1198 1199 if (ini->smcr_version & SMC_V2) { 1200 ini->max_conns = min_t(u8, pclc_v2_ext->max_conns, SMC_CONN_PER_LGR_PREFER); 1201 if (ini->max_conns < SMC_CONN_PER_LGR_MIN) 1202 return SMC_CLC_DECL_MAXCONNERR; 1203 1204 ini->max_links = min_t(u8, pclc_v2_ext->max_links, SMC_LINKS_PER_LGR_MAX_PREFER); 1205 if (ini->max_links < SMC_LINKS_ADD_LNK_MIN) 1206 return SMC_CLC_DECL_MAXLINKERR; 1207 } 1208 1209 return 0; 1210} 1211 1212int smc_clc_clnt_v2x_features_validate(struct smc_clc_first_contact_ext *fce, 1213 struct smc_init_info *ini) 1214{ 1215 struct smc_clc_first_contact_ext_v2x *fce_v2x = 1216 (struct smc_clc_first_contact_ext_v2x *)fce; 1217 1218 if (ini->release_nr < SMC_RELEASE_1) 1219 return 0; 1220 1221 if (!ini->is_smcd) { 1222 if (fce_v2x->max_conns < SMC_CONN_PER_LGR_MIN) 1223 return SMC_CLC_DECL_MAXCONNERR; 1224 ini->max_conns = fce_v2x->max_conns; 1225 1226 if (fce_v2x->max_links > SMC_LINKS_ADD_LNK_MAX || 1227 fce_v2x->max_links < SMC_LINKS_ADD_LNK_MIN) 1228 return SMC_CLC_DECL_MAXLINKERR; 1229 ini->max_links = fce_v2x->max_links; 1230 } 1231 1232 return 0; 1233} 1234 1235int smc_clc_v2x_features_confirm_check(struct smc_clc_msg_accept_confirm *cclc, 1236 struct smc_init_info *ini) 1237{ 1238 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 1239 (struct smc_clc_msg_accept_confirm_v2 *)cclc; 1240 struct smc_clc_first_contact_ext *fce = 1241 smc_get_clc_first_contact_ext(clc_v2, ini->is_smcd); 1242 struct smc_clc_first_contact_ext_v2x *fce_v2x = 1243 (struct smc_clc_first_contact_ext_v2x *)fce; 1244 1245 if (cclc->hdr.version == SMC_V1 || 1246 !(cclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) 1247 return 0; 1248 1249 if (ini->release_nr != fce->release) 1250 return SMC_CLC_DECL_RELEASEERR; 1251 1252 if (fce->release < SMC_RELEASE_1) 1253 return 0; 1254 1255 if (!ini->is_smcd) { 1256 if (fce_v2x->max_conns != ini->max_conns) 1257 return SMC_CLC_DECL_MAXCONNERR; 1258 if (fce_v2x->max_links != ini->max_links) 1259 return SMC_CLC_DECL_MAXLINKERR; 1260 } 1261 1262 return 0; 1263} 1264 1265void smc_clc_get_hostname(u8 **host) 1266{ 1267 *host = &smc_hostname[0]; 1268} 1269 1270void __init smc_clc_init(void) 1271{ 1272 struct new_utsname *u; 1273 1274 memset(smc_hostname, _S, sizeof(smc_hostname)); /* ASCII blanks */ 1275 u = utsname(); 1276 memcpy(smc_hostname, u->nodename, 1277 min_t(size_t, strlen(u->nodename), sizeof(smc_hostname))); 1278 1279 INIT_LIST_HEAD(&smc_clc_eid_table.list); 1280 rwlock_init(&smc_clc_eid_table.lock); 1281 smc_clc_eid_table.ueid_cnt = 0; 1282#if IS_ENABLED(CONFIG_S390) 1283 smc_clc_eid_table.seid_enabled = 1; 1284#else 1285 smc_clc_eid_table.seid_enabled = 0; 1286#endif 1287} 1288 1289void smc_clc_exit(void) 1290{ 1291 smc_clc_ueid_remove(NULL); 1292} 1293