net/smc/smc_clc.c

   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_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 */
 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(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
 452 out:
 453         return ret;
 454 }
 455
 456 /* check if received message has a correct header length and contains valid
 457  * heading and trailing eyecatchers
 458  */
 459 static 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 */
 503 static 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 */
 524 static 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 */
 554 static 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();
 591 out_rel:
 592         dst_release(dst);
 593 out:
 594         return rc;
 595 }
 596
 597 /* match ipv4 addrs of dev against addr in CLC proposal */
 598 static 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 */
 616 static 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 */
 645 int 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();
 665 out_rel:
 666         dst_release(dst);
 667 out:
 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  */
 677 int 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
 781 out:
 782         clc_sk->sk_rcvtimeo = rcvtimeo;
 783         return reason_code;
 784 }
 785
 786 /* send CLC DECLINE message across internal TCP socket */
 787 int 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 */
 829 int 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 */
1010 static 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 */
1142 int 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 */
1167 int 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
1183 int 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
1212 int 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
1235 int 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
1265 void smc_clc_get_hostname(u8 **host)
1266 {
1267         *host = &smc_hostname[0];
1268 }
1269
1270 void __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
1289 void smc_clc_exit(void)
1290 {
1291         smc_clc_ueid_remove(NULL);
1292 }