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 <[email protected]>
  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 (!rc && !smc_clc_eid_table.ueid_cnt) {
 159                 smc_clc_eid_table.seid_enabled = 1;
 160                 rc = -EAGAIN;   /* indicate success and enabling of seid */
 161         }
 162         write_unlock(&smc_clc_eid_table.lock);
 163         return rc;
 164 }
 165
 166 int smc_nl_remove_ueid(struct sk_buff *skb, struct genl_info *info)
 167 {
 168         struct nlattr *nla_ueid = info->attrs[SMC_NLA_EID_TABLE_ENTRY];
 169         char *ueid;
 170
 171         if (!nla_ueid || nla_len(nla_ueid) != SMC_MAX_EID_LEN + 1)
 172                 return -EINVAL;
 173         ueid = (char *)nla_data(nla_ueid);
 174
 175         return smc_clc_ueid_remove(ueid);
 176 }
 177
 178 int smc_nl_flush_ueid(struct sk_buff *skb, struct genl_info *info)
 179 {
 180         smc_clc_ueid_remove(NULL);
 181         return 0;
 182 }
 183
 184 static int smc_nl_ueid_dumpinfo(struct sk_buff *skb, u32 portid, u32 seq,
 185                                 u32 flags, char *ueid)
 186 {
 187         char ueid_str[SMC_MAX_EID_LEN + 1];
 188         void *hdr;
 189
 190         hdr = genlmsg_put(skb, portid, seq, &smc_gen_nl_family,
 191                           flags, SMC_NETLINK_DUMP_UEID);
 192         if (!hdr)
 193                 return -ENOMEM;
 194         memcpy(ueid_str, ueid, SMC_MAX_EID_LEN);
 195         ueid_str[SMC_MAX_EID_LEN] = 0;
 196         if (nla_put_string(skb, SMC_NLA_EID_TABLE_ENTRY, ueid_str)) {
 197                 genlmsg_cancel(skb, hdr);
 198                 return -EMSGSIZE;
 199         }
 200         genlmsg_end(skb, hdr);
 201         return 0;
 202 }
 203
 204 static int _smc_nl_ueid_dump(struct sk_buff *skb, u32 portid, u32 seq,
 205                              int start_idx)
 206 {
 207         struct smc_clc_eid_entry *lst_ueid;
 208         int idx = 0;
 209
 210         read_lock(&smc_clc_eid_table.lock);
 211         list_for_each_entry(lst_ueid, &smc_clc_eid_table.list, list) {
 212                 if (idx++ < start_idx)
 213                         continue;
 214                 if (smc_nl_ueid_dumpinfo(skb, portid, seq, NLM_F_MULTI,
 215                                          lst_ueid->eid)) {
 216                         --idx;
 217                         break;
 218                 }
 219         }
 220         read_unlock(&smc_clc_eid_table.lock);
 221         return idx;
 222 }
 223
 224 int smc_nl_dump_ueid(struct sk_buff *skb, struct netlink_callback *cb)
 225 {
 226         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
 227         int idx;
 228
 229         idx = _smc_nl_ueid_dump(skb, NETLINK_CB(cb->skb).portid,
 230                                 cb->nlh->nlmsg_seq, cb_ctx->pos[0]);
 231
 232         cb_ctx->pos[0] = idx;
 233         return skb->len;
 234 }
 235
 236 int smc_nl_dump_seid(struct sk_buff *skb, struct netlink_callback *cb)
 237 {
 238         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
 239         char seid_str[SMC_MAX_EID_LEN + 1];
 240         u8 seid_enabled;
 241         void *hdr;
 242         u8 *seid;
 243
 244         if (cb_ctx->pos[0])
 245                 return skb->len;
 246
 247         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 248                           &smc_gen_nl_family, NLM_F_MULTI,
 249                           SMC_NETLINK_DUMP_SEID);
 250         if (!hdr)
 251                 return -ENOMEM;
 252         if (!smc_ism_is_v2_capable())
 253                 goto end;
 254
 255         smc_ism_get_system_eid(&seid);
 256         memcpy(seid_str, seid, SMC_MAX_EID_LEN);
 257         seid_str[SMC_MAX_EID_LEN] = 0;
 258         if (nla_put_string(skb, SMC_NLA_SEID_ENTRY, seid_str))
 259                 goto err;
 260         read_lock(&smc_clc_eid_table.lock);
 261         seid_enabled = smc_clc_eid_table.seid_enabled;
 262         read_unlock(&smc_clc_eid_table.lock);
 263         if (nla_put_u8(skb, SMC_NLA_SEID_ENABLED, seid_enabled))
 264                 goto err;
 265 end:
 266         genlmsg_end(skb, hdr);
 267         cb_ctx->pos[0]++;
 268         return skb->len;
 269 err:
 270         genlmsg_cancel(skb, hdr);
 271         return -EMSGSIZE;
 272 }
 273
 274 int smc_nl_enable_seid(struct sk_buff *skb, struct genl_info *info)
 275 {
 276         write_lock(&smc_clc_eid_table.lock);
 277         smc_clc_eid_table.seid_enabled = 1;
 278         write_unlock(&smc_clc_eid_table.lock);
 279         return 0;
 280 }
 281
 282 int smc_nl_disable_seid(struct sk_buff *skb, struct genl_info *info)
 283 {
 284         int rc = 0;
 285
 286         write_lock(&smc_clc_eid_table.lock);
 287         if (!smc_clc_eid_table.ueid_cnt)
 288                 rc = -ENOENT;
 289         else
 290                 smc_clc_eid_table.seid_enabled = 0;
 291         write_unlock(&smc_clc_eid_table.lock);
 292         return rc;
 293 }
 294
 295 static bool _smc_clc_match_ueid(u8 *peer_ueid)
 296 {
 297         struct smc_clc_eid_entry *tmp_ueid;
 298
 299         list_for_each_entry(tmp_ueid, &smc_clc_eid_table.list, list) {
 300                 if (!memcmp(tmp_ueid->eid, peer_ueid, SMC_MAX_EID_LEN))
 301                         return true;
 302         }
 303         return false;
 304 }
 305
 306 bool smc_clc_match_eid(u8 *negotiated_eid,
 307                        struct smc_clc_v2_extension *smc_v2_ext,
 308                        u8 *peer_eid, u8 *local_eid)
 309 {
 310         bool match = false;
 311         int i;
 312
 313         negotiated_eid[0] = 0;
 314         read_lock(&smc_clc_eid_table.lock);
 315         if (peer_eid && local_eid &&
 316             smc_clc_eid_table.seid_enabled &&
 317             smc_v2_ext->hdr.flag.seid &&
 318             !memcmp(peer_eid, local_eid, SMC_MAX_EID_LEN)) {
 319                 memcpy(negotiated_eid, peer_eid, SMC_MAX_EID_LEN);
 320                 match = true;
 321                 goto out;
 322         }
 323
 324         for (i = 0; i < smc_v2_ext->hdr.eid_cnt; i++) {
 325                 if (_smc_clc_match_ueid(smc_v2_ext->user_eids[i])) {
 326                         memcpy(negotiated_eid, smc_v2_ext->user_eids[i],
 327                                SMC_MAX_EID_LEN);
 328                         match = true;
 329                         goto out;
 330                 }
 331         }
 332 out:
 333         read_unlock(&smc_clc_eid_table.lock);
 334         return match;
 335 }
 336
 337 /* check arriving CLC proposal */
 338 static bool smc_clc_msg_prop_valid(struct smc_clc_msg_proposal *pclc)
 339 {
 340         struct smc_clc_msg_proposal_prefix *pclc_prfx;
 341         struct smc_clc_smcd_v2_extension *smcd_v2_ext;
 342         struct smc_clc_msg_hdr *hdr = &pclc->hdr;
 343         struct smc_clc_v2_extension *v2_ext;
 344
 345         v2_ext = smc_get_clc_v2_ext(pclc);
 346         pclc_prfx = smc_clc_proposal_get_prefix(pclc);
 347         if (hdr->version == SMC_V1) {
 348                 if (hdr->typev1 == SMC_TYPE_N)
 349                         return false;
 350                 if (ntohs(hdr->length) !=
 351                         sizeof(*pclc) + ntohs(pclc->iparea_offset) +
 352                         sizeof(*pclc_prfx) +
 353                         pclc_prfx->ipv6_prefixes_cnt *
 354                                 sizeof(struct smc_clc_ipv6_prefix) +
 355                         sizeof(struct smc_clc_msg_trail))
 356                         return false;
 357         } else {
 358                 if (ntohs(hdr->length) !=
 359                         sizeof(*pclc) +
 360                         sizeof(struct smc_clc_msg_smcd) +
 361                         (hdr->typev1 != SMC_TYPE_N ?
 362                                 sizeof(*pclc_prfx) +
 363                                 pclc_prfx->ipv6_prefixes_cnt *
 364                                 sizeof(struct smc_clc_ipv6_prefix) : 0) +
 365                         (hdr->typev2 != SMC_TYPE_N ?
 366                                 sizeof(*v2_ext) +
 367                                 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN : 0) +
 368                         (smcd_indicated(hdr->typev2) ?
 369                                 sizeof(*smcd_v2_ext) + v2_ext->hdr.ism_gid_cnt *
 370                                         sizeof(struct smc_clc_smcd_gid_chid) :
 371                                 0) +
 372                         sizeof(struct smc_clc_msg_trail))
 373                         return false;
 374         }
 375         return true;
 376 }
 377
 378 /* check arriving CLC accept or confirm */
 379 static bool
 380 smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm_v2 *clc_v2)
 381 {
 382         struct smc_clc_msg_hdr *hdr = &clc_v2->hdr;
 383
 384         if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
 385                 return false;
 386         if (hdr->version == SMC_V1) {
 387                 if ((hdr->typev1 == SMC_TYPE_R &&
 388                      ntohs(hdr->length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) ||
 389                     (hdr->typev1 == SMC_TYPE_D &&
 390                      ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN))
 391                         return false;
 392         } else {
 393                 if (hdr->typev1 == SMC_TYPE_D &&
 394                     ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 &&
 395                     (ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 +
 396                                 sizeof(struct smc_clc_first_contact_ext)))
 397                         return false;
 398                 if (hdr->typev1 == SMC_TYPE_R &&
 399                     ntohs(hdr->length) < SMCR_CLC_ACCEPT_CONFIRM_LEN_V2)
 400                         return false;
 401         }
 402         return true;
 403 }
 404
 405 /* check arriving CLC decline */
 406 static bool
 407 smc_clc_msg_decl_valid(struct smc_clc_msg_decline *dclc)
 408 {
 409         struct smc_clc_msg_hdr *hdr = &dclc->hdr;
 410
 411         if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
 412                 return false;
 413         if (hdr->version == SMC_V1) {
 414                 if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline))
 415                         return false;
 416         } else {
 417                 if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline_v2))
 418                         return false;
 419         }
 420         return true;
 421 }
 422
 423 static void smc_clc_fill_fce(struct smc_clc_first_contact_ext *fce, int *len)
 424 {
 425         memset(fce, 0, sizeof(*fce));
 426         fce->os_type = SMC_CLC_OS_LINUX;
 427         fce->release = SMC_RELEASE;
 428         memcpy(fce->hostname, smc_hostname, sizeof(smc_hostname));
 429         (*len) += sizeof(*fce);
 430 }
 431
 432 /* check if received message has a correct header length and contains valid
 433  * heading and trailing eyecatchers
 434  */
 435 static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl)
 436 {
 437         struct smc_clc_msg_accept_confirm_v2 *clc_v2;
 438         struct smc_clc_msg_proposal *pclc;
 439         struct smc_clc_msg_decline *dclc;
 440         struct smc_clc_msg_trail *trl;
 441
 442         if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
 443             memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
 444                 return false;
 445         switch (clcm->type) {
 446         case SMC_CLC_PROPOSAL:
 447                 pclc = (struct smc_clc_msg_proposal *)clcm;
 448                 if (!smc_clc_msg_prop_valid(pclc))
 449                         return false;
 450                 trl = (struct smc_clc_msg_trail *)
 451                         ((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl));
 452                 break;
 453         case SMC_CLC_ACCEPT:
 454         case SMC_CLC_CONFIRM:
 455                 clc_v2 = (struct smc_clc_msg_accept_confirm_v2 *)clcm;
 456                 if (!smc_clc_msg_acc_conf_valid(clc_v2))
 457                         return false;
 458                 trl = (struct smc_clc_msg_trail *)
 459                         ((u8 *)clc_v2 + ntohs(clc_v2->hdr.length) -
 460                                                         sizeof(*trl));
 461                 break;
 462         case SMC_CLC_DECLINE:
 463                 dclc = (struct smc_clc_msg_decline *)clcm;
 464                 if (!smc_clc_msg_decl_valid(dclc))
 465                         return false;
 466                 check_trl = false;
 467                 break;
 468         default:
 469                 return false;
 470         }
 471         if (check_trl &&
 472             memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
 473             memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
 474                 return false;
 475         return true;
 476 }
 477
 478 /* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */
 479 static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4,
 480                                  struct smc_clc_msg_proposal_prefix *prop)
 481 {
 482         struct in_device *in_dev = __in_dev_get_rcu(dst->dev);
 483         const struct in_ifaddr *ifa;
 484
 485         if (!in_dev)
 486                 return -ENODEV;
 487
 488         in_dev_for_each_ifa_rcu(ifa, in_dev) {
 489                 if (!inet_ifa_match(ipv4, ifa))
 490                         continue;
 491                 prop->prefix_len = inet_mask_len(ifa->ifa_mask);
 492                 prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask;
 493                 /* prop->ipv6_prefixes_cnt = 0; already done by memset before */
 494                 return 0;
 495         }
 496         return -ENOENT;
 497 }
 498
 499 /* fill CLC proposal msg with ipv6 prefixes from device */
 500 static int smc_clc_prfx_set6_rcu(struct dst_entry *dst,
 501                                  struct smc_clc_msg_proposal_prefix *prop,
 502                                  struct smc_clc_ipv6_prefix *ipv6_prfx)
 503 {
 504 #if IS_ENABLED(CONFIG_IPV6)
 505         struct inet6_dev *in6_dev = __in6_dev_get(dst->dev);
 506         struct inet6_ifaddr *ifa;
 507         int cnt = 0;
 508
 509         if (!in6_dev)
 510                 return -ENODEV;
 511         /* use a maximum of 8 IPv6 prefixes from device */
 512         list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
 513                 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
 514                         continue;
 515                 ipv6_addr_prefix(&ipv6_prfx[cnt].prefix,
 516                                  &ifa->addr, ifa->prefix_len);
 517                 ipv6_prfx[cnt].prefix_len = ifa->prefix_len;
 518                 cnt++;
 519                 if (cnt == SMC_CLC_MAX_V6_PREFIX)
 520                         break;
 521         }
 522         prop->ipv6_prefixes_cnt = cnt;
 523         if (cnt)
 524                 return 0;
 525 #endif
 526         return -ENOENT;
 527 }
 528
 529 /* retrieve and set prefixes in CLC proposal msg */
 530 static int smc_clc_prfx_set(struct socket *clcsock,
 531                             struct smc_clc_msg_proposal_prefix *prop,
 532                             struct smc_clc_ipv6_prefix *ipv6_prfx)
 533 {
 534         struct dst_entry *dst = sk_dst_get(clcsock->sk);
 535         struct sockaddr_storage addrs;
 536         struct sockaddr_in6 *addr6;
 537         struct sockaddr_in *addr;
 538         int rc = -ENOENT;
 539
 540         if (!dst) {
 541                 rc = -ENOTCONN;
 542                 goto out;
 543         }
 544         if (!dst->dev) {
 545                 rc = -ENODEV;
 546                 goto out_rel;
 547         }
 548         /* get address to which the internal TCP socket is bound */
 549         if (kernel_getsockname(clcsock, (struct sockaddr *)&addrs) < 0)
 550                 goto out_rel;
 551         /* analyze IP specific data of net_device belonging to TCP socket */
 552         addr6 = (struct sockaddr_in6 *)&addrs;
 553         rcu_read_lock();
 554         if (addrs.ss_family == PF_INET) {
 555                 /* IPv4 */
 556                 addr = (struct sockaddr_in *)&addrs;
 557                 rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop);
 558         } else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) {
 559                 /* mapped IPv4 address - peer is IPv4 only */
 560                 rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3],
 561                                            prop);
 562         } else {
 563                 /* IPv6 */
 564                 rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx);
 565         }
 566         rcu_read_unlock();
 567 out_rel:
 568         dst_release(dst);
 569 out:
 570         return rc;
 571 }
 572
 573 /* match ipv4 addrs of dev against addr in CLC proposal */
 574 static int smc_clc_prfx_match4_rcu(struct net_device *dev,
 575                                    struct smc_clc_msg_proposal_prefix *prop)
 576 {
 577         struct in_device *in_dev = __in_dev_get_rcu(dev);
 578         const struct in_ifaddr *ifa;
 579
 580         if (!in_dev)
 581                 return -ENODEV;
 582         in_dev_for_each_ifa_rcu(ifa, in_dev) {
 583                 if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) &&
 584                     inet_ifa_match(prop->outgoing_subnet, ifa))
 585                         return 0;
 586         }
 587
 588         return -ENOENT;
 589 }
 590
 591 /* match ipv6 addrs of dev against addrs in CLC proposal */
 592 static int smc_clc_prfx_match6_rcu(struct net_device *dev,
 593                                    struct smc_clc_msg_proposal_prefix *prop)
 594 {
 595 #if IS_ENABLED(CONFIG_IPV6)
 596         struct inet6_dev *in6_dev = __in6_dev_get(dev);
 597         struct smc_clc_ipv6_prefix *ipv6_prfx;
 598         struct inet6_ifaddr *ifa;
 599         int i, max;
 600
 601         if (!in6_dev)
 602                 return -ENODEV;
 603         /* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */
 604         ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop));
 605         max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX);
 606         list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
 607                 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
 608                         continue;
 609                 for (i = 0; i < max; i++) {
 610                         if (ifa->prefix_len == ipv6_prfx[i].prefix_len &&
 611                             ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix,
 612                                               ifa->prefix_len))
 613                                 return 0;
 614                 }
 615         }
 616 #endif
 617         return -ENOENT;
 618 }
 619
 620 /* check if proposed prefixes match one of our device prefixes */
 621 int smc_clc_prfx_match(struct socket *clcsock,
 622                        struct smc_clc_msg_proposal_prefix *prop)
 623 {
 624         struct dst_entry *dst = sk_dst_get(clcsock->sk);
 625         int rc;
 626
 627         if (!dst) {
 628                 rc = -ENOTCONN;
 629                 goto out;
 630         }
 631         if (!dst->dev) {
 632                 rc = -ENODEV;
 633                 goto out_rel;
 634         }
 635         rcu_read_lock();
 636         if (!prop->ipv6_prefixes_cnt)
 637                 rc = smc_clc_prfx_match4_rcu(dst->dev, prop);
 638         else
 639                 rc = smc_clc_prfx_match6_rcu(dst->dev, prop);
 640         rcu_read_unlock();
 641 out_rel:
 642         dst_release(dst);
 643 out:
 644         return rc;
 645 }
 646
 647 /* Wait for data on the tcp-socket, analyze received data
 648  * Returns:
 649  * 0 if success and it was not a decline that we received.
 650  * SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send.
 651  * clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise.
 652  */
 653 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
 654                      u8 expected_type, unsigned long timeout)
 655 {
 656         long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo;
 657         struct sock *clc_sk = smc->clcsock->sk;
 658         struct smc_clc_msg_hdr *clcm = buf;
 659         struct msghdr msg = {NULL, 0};
 660         int reason_code = 0;
 661         struct kvec vec = {buf, buflen};
 662         int len, datlen, recvlen;
 663         bool check_trl = true;
 664         int krflags;
 665
 666         /* peek the first few bytes to determine length of data to receive
 667          * so we don't consume any subsequent CLC message or payload data
 668          * in the TCP byte stream
 669          */
 670         /*
 671          * Caller must make sure that buflen is no less than
 672          * sizeof(struct smc_clc_msg_hdr)
 673          */
 674         krflags = MSG_PEEK | MSG_WAITALL;
 675         clc_sk->sk_rcvtimeo = timeout;
 676         iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1,
 677                         sizeof(struct smc_clc_msg_hdr));
 678         len = sock_recvmsg(smc->clcsock, &msg, krflags);
 679         if (signal_pending(current)) {
 680                 reason_code = -EINTR;
 681                 clc_sk->sk_err = EINTR;
 682                 smc->sk.sk_err = EINTR;
 683                 goto out;
 684         }
 685         if (clc_sk->sk_err) {
 686                 reason_code = -clc_sk->sk_err;
 687                 if (clc_sk->sk_err == EAGAIN &&
 688                     expected_type == SMC_CLC_DECLINE)
 689                         clc_sk->sk_err = 0; /* reset for fallback usage */
 690                 else
 691                         smc->sk.sk_err = clc_sk->sk_err;
 692                 goto out;
 693         }
 694         if (!len) { /* peer has performed orderly shutdown */
 695                 smc->sk.sk_err = ECONNRESET;
 696                 reason_code = -ECONNRESET;
 697                 goto out;
 698         }
 699         if (len < 0) {
 700                 if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE)
 701                         smc->sk.sk_err = -len;
 702                 reason_code = len;
 703                 goto out;
 704         }
 705         datlen = ntohs(clcm->length);
 706         if ((len < sizeof(struct smc_clc_msg_hdr)) ||
 707             (clcm->version < SMC_V1) ||
 708             ((clcm->type != SMC_CLC_DECLINE) &&
 709              (clcm->type != expected_type))) {
 710                 smc->sk.sk_err = EPROTO;
 711                 reason_code = -EPROTO;
 712                 goto out;
 713         }
 714
 715         /* receive the complete CLC message */
 716         memset(&msg, 0, sizeof(struct msghdr));
 717         if (datlen > buflen) {
 718                 check_trl = false;
 719                 recvlen = buflen;
 720         } else {
 721                 recvlen = datlen;
 722         }
 723         iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
 724         krflags = MSG_WAITALL;
 725         len = sock_recvmsg(smc->clcsock, &msg, krflags);
 726         if (len < recvlen || !smc_clc_msg_hdr_valid(clcm, check_trl)) {
 727                 smc->sk.sk_err = EPROTO;
 728                 reason_code = -EPROTO;
 729                 goto out;
 730         }
 731         datlen -= len;
 732         while (datlen) {
 733                 u8 tmp[SMC_CLC_RECV_BUF_LEN];
 734
 735                 vec.iov_base = &tmp;
 736                 vec.iov_len = SMC_CLC_RECV_BUF_LEN;
 737                 /* receive remaining proposal message */
 738                 recvlen = datlen > SMC_CLC_RECV_BUF_LEN ?
 739                                                 SMC_CLC_RECV_BUF_LEN : datlen;
 740                 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
 741                 len = sock_recvmsg(smc->clcsock, &msg, krflags);
 742                 datlen -= len;
 743         }
 744         if (clcm->type == SMC_CLC_DECLINE) {
 745                 struct smc_clc_msg_decline *dclc;
 746
 747                 dclc = (struct smc_clc_msg_decline *)clcm;
 748                 reason_code = SMC_CLC_DECL_PEERDECL;
 749                 smc->peer_diagnosis = ntohl(dclc->peer_diagnosis);
 750                 if (((struct smc_clc_msg_decline *)buf)->hdr.typev2 &
 751                                                 SMC_FIRST_CONTACT_MASK) {
 752                         smc->conn.lgr->sync_err = 1;
 753                         smc_lgr_terminate_sched(smc->conn.lgr);
 754                 }
 755         }
 756
 757 out:
 758         clc_sk->sk_rcvtimeo = rcvtimeo;
 759         return reason_code;
 760 }
 761
 762 /* send CLC DECLINE message across internal TCP socket */
 763 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version)
 764 {
 765         struct smc_clc_msg_decline *dclc_v1;
 766         struct smc_clc_msg_decline_v2 dclc;
 767         struct msghdr msg;
 768         int len, send_len;
 769         struct kvec vec;
 770
 771         dclc_v1 = (struct smc_clc_msg_decline *)&dclc;
 772         memset(&dclc, 0, sizeof(dclc));
 773         memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
 774         dclc.hdr.type = SMC_CLC_DECLINE;
 775         dclc.hdr.version = version;
 776         dclc.os_type = version == SMC_V1 ? 0 : SMC_CLC_OS_LINUX;
 777         dclc.hdr.typev2 = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ?
 778                                                 SMC_FIRST_CONTACT_MASK : 0;
 779         if ((!smc_conn_lgr_valid(&smc->conn) || !smc->conn.lgr->is_smcd) &&
 780             smc_ib_is_valid_local_systemid())
 781                 memcpy(dclc.id_for_peer, local_systemid,
 782                        sizeof(local_systemid));
 783         dclc.peer_diagnosis = htonl(peer_diag_info);
 784         if (version == SMC_V1) {
 785                 memcpy(dclc_v1->trl.eyecatcher, SMC_EYECATCHER,
 786                        sizeof(SMC_EYECATCHER));
 787                 send_len = sizeof(*dclc_v1);
 788         } else {
 789                 memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER,
 790                        sizeof(SMC_EYECATCHER));
 791                 send_len = sizeof(dclc);
 792         }
 793         dclc.hdr.length = htons(send_len);
 794
 795         memset(&msg, 0, sizeof(msg));
 796         vec.iov_base = &dclc;
 797         vec.iov_len = send_len;
 798         len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, send_len);
 799         if (len < 0 || len < send_len)
 800                 len = -EPROTO;
 801         return len > 0 ? 0 : len;
 802 }
 803
 804 /* send CLC PROPOSAL message across internal TCP socket */
 805 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini)
 806 {
 807         struct smc_clc_smcd_v2_extension *smcd_v2_ext;
 808         struct smc_clc_msg_proposal_prefix *pclc_prfx;
 809         struct smc_clc_msg_proposal *pclc_base;
 810         struct smc_clc_smcd_gid_chid *gidchids;
 811         struct smc_clc_msg_proposal_area *pclc;
 812         struct smc_clc_ipv6_prefix *ipv6_prfx;
 813         struct smc_clc_v2_extension *v2_ext;
 814         struct smc_clc_msg_smcd *pclc_smcd;
 815         struct smc_clc_msg_trail *trl;
 816         struct smcd_dev *smcd;
 817         int len, i, plen, rc;
 818         int reason_code = 0;
 819         struct kvec vec[8];
 820         struct msghdr msg;
 821
 822         pclc = kzalloc(sizeof(*pclc), GFP_KERNEL);
 823         if (!pclc)
 824                 return -ENOMEM;
 825
 826         pclc_base = &pclc->pclc_base;
 827         pclc_smcd = &pclc->pclc_smcd;
 828         pclc_prfx = &pclc->pclc_prfx;
 829         ipv6_prfx = pclc->pclc_prfx_ipv6;
 830         v2_ext = &pclc->pclc_v2_ext;
 831         smcd_v2_ext = &pclc->pclc_smcd_v2_ext;
 832         gidchids = pclc->pclc_gidchids;
 833         trl = &pclc->pclc_trl;
 834
 835         pclc_base->hdr.version = SMC_V2;
 836         pclc_base->hdr.typev1 = ini->smc_type_v1;
 837         pclc_base->hdr.typev2 = ini->smc_type_v2;
 838         plen = sizeof(*pclc_base) + sizeof(*pclc_smcd) + sizeof(*trl);
 839
 840         /* retrieve ip prefixes for CLC proposal msg */
 841         if (ini->smc_type_v1 != SMC_TYPE_N) {
 842                 rc = smc_clc_prfx_set(smc->clcsock, pclc_prfx, ipv6_prfx);
 843                 if (rc) {
 844                         if (ini->smc_type_v2 == SMC_TYPE_N) {
 845                                 kfree(pclc);
 846                                 return SMC_CLC_DECL_CNFERR;
 847                         }
 848                         pclc_base->hdr.typev1 = SMC_TYPE_N;
 849                 } else {
 850                         pclc_base->iparea_offset = htons(sizeof(*pclc_smcd));
 851                         plen += sizeof(*pclc_prfx) +
 852                                         pclc_prfx->ipv6_prefixes_cnt *
 853                                         sizeof(ipv6_prfx[0]);
 854                 }
 855         }
 856
 857         /* build SMC Proposal CLC message */
 858         memcpy(pclc_base->hdr.eyecatcher, SMC_EYECATCHER,
 859                sizeof(SMC_EYECATCHER));
 860         pclc_base->hdr.type = SMC_CLC_PROPOSAL;
 861         if (smcr_indicated(ini->smc_type_v1)) {
 862                 /* add SMC-R specifics */
 863                 memcpy(pclc_base->lcl.id_for_peer, local_systemid,
 864                        sizeof(local_systemid));
 865                 memcpy(pclc_base->lcl.gid, ini->ib_gid, SMC_GID_SIZE);
 866                 memcpy(pclc_base->lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1],
 867                        ETH_ALEN);
 868         }
 869         if (smcd_indicated(ini->smc_type_v1)) {
 870                 /* add SMC-D specifics */
 871                 if (ini->ism_dev[0]) {
 872                         smcd = ini->ism_dev[0];
 873                         pclc_smcd->ism.gid =
 874                                 htonll(smcd->ops->get_local_gid(smcd));
 875                         pclc_smcd->ism.chid =
 876                                 htons(smc_ism_get_chid(ini->ism_dev[0]));
 877                 }
 878         }
 879         if (ini->smc_type_v2 == SMC_TYPE_N) {
 880                 pclc_smcd->v2_ext_offset = 0;
 881         } else {
 882                 struct smc_clc_eid_entry *ueident;
 883                 u16 v2_ext_offset;
 884
 885                 v2_ext->hdr.flag.release = SMC_RELEASE;
 886                 v2_ext_offset = sizeof(*pclc_smcd) -
 887                         offsetofend(struct smc_clc_msg_smcd, v2_ext_offset);
 888                 if (ini->smc_type_v1 != SMC_TYPE_N)
 889                         v2_ext_offset += sizeof(*pclc_prfx) +
 890                                                 pclc_prfx->ipv6_prefixes_cnt *
 891                                                 sizeof(ipv6_prfx[0]);
 892                 pclc_smcd->v2_ext_offset = htons(v2_ext_offset);
 893                 plen += sizeof(*v2_ext);
 894
 895                 read_lock(&smc_clc_eid_table.lock);
 896                 v2_ext->hdr.eid_cnt = smc_clc_eid_table.ueid_cnt;
 897                 plen += smc_clc_eid_table.ueid_cnt * SMC_MAX_EID_LEN;
 898                 i = 0;
 899                 list_for_each_entry(ueident, &smc_clc_eid_table.list, list) {
 900                         memcpy(v2_ext->user_eids[i++], ueident->eid,
 901                                sizeof(ueident->eid));
 902                 }
 903                 read_unlock(&smc_clc_eid_table.lock);
 904         }
 905         if (smcd_indicated(ini->smc_type_v2)) {
 906                 u8 *eid = NULL;
 907
 908                 v2_ext->hdr.flag.seid = smc_clc_eid_table.seid_enabled;
 909                 v2_ext->hdr.ism_gid_cnt = ini->ism_offered_cnt;
 910                 v2_ext->hdr.smcd_v2_ext_offset = htons(sizeof(*v2_ext) -
 911                                 offsetofend(struct smc_clnt_opts_area_hdr,
 912                                             smcd_v2_ext_offset) +
 913                                 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);
 914                 smc_ism_get_system_eid(&eid);
 915                 if (eid && v2_ext->hdr.flag.seid)
 916                         memcpy(smcd_v2_ext->system_eid, eid, SMC_MAX_EID_LEN);
 917                 plen += sizeof(*smcd_v2_ext);
 918                 if (ini->ism_offered_cnt) {
 919                         for (i = 1; i <= ini->ism_offered_cnt; i++) {
 920                                 smcd = ini->ism_dev[i];
 921                                 gidchids[i - 1].gid =
 922                                         htonll(smcd->ops->get_local_gid(smcd));
 923                                 gidchids[i - 1].chid =
 924                                         htons(smc_ism_get_chid(ini->ism_dev[i]));
 925                         }
 926                         plen += ini->ism_offered_cnt *
 927                                 sizeof(struct smc_clc_smcd_gid_chid);
 928                 }
 929         }
 930         if (smcr_indicated(ini->smc_type_v2))
 931                 memcpy(v2_ext->roce, ini->smcrv2.ib_gid_v2, SMC_GID_SIZE);
 932
 933         pclc_base->hdr.length = htons(plen);
 934         memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
 935
 936         /* send SMC Proposal CLC message */
 937         memset(&msg, 0, sizeof(msg));
 938         i = 0;
 939         vec[i].iov_base = pclc_base;
 940         vec[i++].iov_len = sizeof(*pclc_base);
 941         vec[i].iov_base = pclc_smcd;
 942         vec[i++].iov_len = sizeof(*pclc_smcd);
 943         if (ini->smc_type_v1 != SMC_TYPE_N) {
 944                 vec[i].iov_base = pclc_prfx;
 945                 vec[i++].iov_len = sizeof(*pclc_prfx);
 946                 if (pclc_prfx->ipv6_prefixes_cnt > 0) {
 947                         vec[i].iov_base = ipv6_prfx;
 948                         vec[i++].iov_len = pclc_prfx->ipv6_prefixes_cnt *
 949                                            sizeof(ipv6_prfx[0]);
 950                 }
 951         }
 952         if (ini->smc_type_v2 != SMC_TYPE_N) {
 953                 vec[i].iov_base = v2_ext;
 954                 vec[i++].iov_len = sizeof(*v2_ext) +
 955                                    (v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);
 956                 if (smcd_indicated(ini->smc_type_v2)) {
 957                         vec[i].iov_base = smcd_v2_ext;
 958                         vec[i++].iov_len = sizeof(*smcd_v2_ext);
 959                         if (ini->ism_offered_cnt) {
 960                                 vec[i].iov_base = gidchids;
 961                                 vec[i++].iov_len = ini->ism_offered_cnt *
 962                                         sizeof(struct smc_clc_smcd_gid_chid);
 963                         }
 964                 }
 965         }
 966         vec[i].iov_base = trl;
 967         vec[i++].iov_len = sizeof(*trl);
 968         /* due to the few bytes needed for clc-handshake this cannot block */
 969         len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen);
 970         if (len < 0) {
 971                 smc->sk.sk_err = smc->clcsock->sk->sk_err;
 972                 reason_code = -smc->sk.sk_err;
 973         } else if (len < ntohs(pclc_base->hdr.length)) {
 974                 reason_code = -ENETUNREACH;
 975                 smc->sk.sk_err = -reason_code;
 976         }
 977
 978         kfree(pclc);
 979         return reason_code;
 980 }
 981
 982 /* build and send CLC CONFIRM / ACCEPT message */
 983 static int smc_clc_send_confirm_accept(struct smc_sock *smc,
 984                                        struct smc_clc_msg_accept_confirm_v2 *clc_v2,
 985                                        int first_contact, u8 version,
 986                                        u8 *eid, struct smc_init_info *ini)
 987 {
 988         struct smc_connection *conn = &smc->conn;
 989         struct smc_clc_msg_accept_confirm *clc;
 990         struct smc_clc_first_contact_ext fce;
 991         struct smc_clc_fce_gid_ext gle;
 992         struct smc_clc_msg_trail trl;
 993         struct kvec vec[5];
 994         struct msghdr msg;
 995         int i, len;
 996
 997         /* send SMC Confirm CLC msg */
 998         clc = (struct smc_clc_msg_accept_confirm *)clc_v2;
 999         clc->hdr.version = version;     /* SMC version */
1000         if (first_contact)
1001                 clc->hdr.typev2 |= SMC_FIRST_CONTACT_MASK;
1002         if (conn->lgr->is_smcd) {
1003                 /* SMC-D specific settings */
1004                 memcpy(clc->hdr.eyecatcher, SMCD_EYECATCHER,
1005                        sizeof(SMCD_EYECATCHER));
1006                 clc->hdr.typev1 = SMC_TYPE_D;
1007                 clc->d0.gid =
1008                         conn->lgr->smcd->ops->get_local_gid(conn->lgr->smcd);
1009                 clc->d0.token = conn->rmb_desc->token;
1010                 clc->d0.dmbe_size = conn->rmbe_size_short;
1011                 clc->d0.dmbe_idx = 0;
1012                 memcpy(&clc->d0.linkid, conn->lgr->id, SMC_LGR_ID_SIZE);
1013                 if (version == SMC_V1) {
1014                         clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
1015                 } else {
1016                         clc_v2->d1.chid =
1017                                 htons(smc_ism_get_chid(conn->lgr->smcd));
1018                         if (eid && eid[0])
1019                                 memcpy(clc_v2->d1.eid, eid, SMC_MAX_EID_LEN);
1020                         len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2;
1021                         if (first_contact)
1022                                 smc_clc_fill_fce(&fce, &len);
1023                         clc_v2->hdr.length = htons(len);
1024                 }
1025                 memcpy(trl.eyecatcher, SMCD_EYECATCHER,
1026                        sizeof(SMCD_EYECATCHER));
1027         } else {
1028                 struct smc_link *link = conn->lnk;
1029
1030                 /* SMC-R specific settings */
1031                 memcpy(clc->hdr.eyecatcher, SMC_EYECATCHER,
1032                        sizeof(SMC_EYECATCHER));
1033                 clc->hdr.typev1 = SMC_TYPE_R;
1034                 clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
1035                 memcpy(clc->r0.lcl.id_for_peer, local_systemid,
1036                        sizeof(local_systemid));
1037                 memcpy(&clc->r0.lcl.gid, link->gid, SMC_GID_SIZE);
1038                 memcpy(&clc->r0.lcl.mac, &link->smcibdev->mac[link->ibport - 1],
1039                        ETH_ALEN);
1040                 hton24(clc->r0.qpn, link->roce_qp->qp_num);
1041                 clc->r0.rmb_rkey =
1042                         htonl(conn->rmb_desc->mr[link->link_idx]->rkey);
1043                 clc->r0.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */
1044                 clc->r0.rmbe_alert_token = htonl(conn->alert_token_local);
1045                 switch (clc->hdr.type) {
1046                 case SMC_CLC_ACCEPT:
1047                         clc->r0.qp_mtu = link->path_mtu;
1048                         break;
1049                 case SMC_CLC_CONFIRM:
1050                         clc->r0.qp_mtu = min(link->path_mtu, link->peer_mtu);
1051                         break;
1052                 }
1053                 clc->r0.rmbe_size = conn->rmbe_size_short;
1054                 clc->r0.rmb_dma_addr = conn->rmb_desc->is_vm ?
1055                         cpu_to_be64((uintptr_t)conn->rmb_desc->cpu_addr) :
1056                         cpu_to_be64((u64)sg_dma_address
1057                                     (conn->rmb_desc->sgt[link->link_idx].sgl));
1058                 hton24(clc->r0.psn, link->psn_initial);
1059                 if (version == SMC_V1) {
1060                         clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
1061                 } else {
1062                         if (eid && eid[0])
1063                                 memcpy(clc_v2->r1.eid, eid, SMC_MAX_EID_LEN);
1064                         len = SMCR_CLC_ACCEPT_CONFIRM_LEN_V2;
1065                         if (first_contact) {
1066                                 smc_clc_fill_fce(&fce, &len);
1067                                 fce.v2_direct = !link->lgr->uses_gateway;
1068                                 memset(&gle, 0, sizeof(gle));
1069                                 if (ini && clc->hdr.type == SMC_CLC_CONFIRM) {
1070                                         gle.gid_cnt = ini->smcrv2.gidlist.len;
1071                                         len += sizeof(gle);
1072                                         len += gle.gid_cnt * sizeof(gle.gid[0]);
1073                                 } else {
1074                                         len += sizeof(gle.reserved);
1075                                 }
1076                         }
1077                         clc_v2->hdr.length = htons(len);
1078                 }
1079                 memcpy(trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
1080         }
1081
1082         memset(&msg, 0, sizeof(msg));
1083         i = 0;
1084         vec[i].iov_base = clc_v2;
1085         if (version > SMC_V1)
1086                 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ?
1087                                         SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 :
1088                                         SMCR_CLC_ACCEPT_CONFIRM_LEN_V2) -
1089                                    sizeof(trl);
1090         else
1091                 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ?
1092                                                 SMCD_CLC_ACCEPT_CONFIRM_LEN :
1093                                                 SMCR_CLC_ACCEPT_CONFIRM_LEN) -
1094                                    sizeof(trl);
1095         if (version > SMC_V1 && first_contact) {
1096                 vec[i].iov_base = &fce;
1097                 vec[i++].iov_len = sizeof(fce);
1098                 if (!conn->lgr->is_smcd) {
1099                         if (clc->hdr.type == SMC_CLC_CONFIRM) {
1100                                 vec[i].iov_base = &gle;
1101                                 vec[i++].iov_len = sizeof(gle);
1102                                 vec[i].iov_base = &ini->smcrv2.gidlist.list;
1103                                 vec[i++].iov_len = gle.gid_cnt *
1104                                                    sizeof(gle.gid[0]);
1105                         } else {
1106                                 vec[i].iov_base = &gle.reserved;
1107                                 vec[i++].iov_len = sizeof(gle.reserved);
1108                         }
1109                 }
1110         }
1111         vec[i].iov_base = &trl;
1112         vec[i++].iov_len = sizeof(trl);
1113         return kernel_sendmsg(smc->clcsock, &msg, vec, 1,
1114                               ntohs(clc->hdr.length));
1115 }
1116
1117 /* send CLC CONFIRM message across internal TCP socket */
1118 int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
1119                          u8 version, u8 *eid, struct smc_init_info *ini)
1120 {
1121         struct smc_clc_msg_accept_confirm_v2 cclc_v2;
1122         int reason_code = 0;
1123         int len;
1124
1125         /* send SMC Confirm CLC msg */
1126         memset(&cclc_v2, 0, sizeof(cclc_v2));
1127         cclc_v2.hdr.type = SMC_CLC_CONFIRM;
1128         len = smc_clc_send_confirm_accept(smc, &cclc_v2, clnt_first_contact,
1129                                           version, eid, ini);
1130         if (len < ntohs(cclc_v2.hdr.length)) {
1131                 if (len >= 0) {
1132                         reason_code = -ENETUNREACH;
1133                         smc->sk.sk_err = -reason_code;
1134                 } else {
1135                         smc->sk.sk_err = smc->clcsock->sk->sk_err;
1136                         reason_code = -smc->sk.sk_err;
1137                 }
1138         }
1139         return reason_code;
1140 }
1141
1142 /* send CLC ACCEPT message across internal TCP socket */
1143 int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact,
1144                         u8 version, u8 *negotiated_eid)
1145 {
1146         struct smc_clc_msg_accept_confirm_v2 aclc_v2;
1147         int len;
1148
1149         memset(&aclc_v2, 0, sizeof(aclc_v2));
1150         aclc_v2.hdr.type = SMC_CLC_ACCEPT;
1151         len = smc_clc_send_confirm_accept(new_smc, &aclc_v2, srv_first_contact,
1152                                           version, negotiated_eid, NULL);
1153         if (len < ntohs(aclc_v2.hdr.length))
1154                 len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err;
1155
1156         return len > 0 ? 0 : len;
1157 }
1158
1159 void smc_clc_get_hostname(u8 **host)
1160 {
1161         *host = &smc_hostname[0];
1162 }
1163
1164 void __init smc_clc_init(void)
1165 {
1166         struct new_utsname *u;
1167
1168         memset(smc_hostname, _S, sizeof(smc_hostname)); /* ASCII blanks */
1169         u = utsname();
1170         memcpy(smc_hostname, u->nodename,
1171                min_t(size_t, strlen(u->nodename), sizeof(smc_hostname)));
1172
1173         INIT_LIST_HEAD(&smc_clc_eid_table.list);
1174         rwlock_init(&smc_clc_eid_table.lock);
1175         smc_clc_eid_table.ueid_cnt = 0;
1176         smc_clc_eid_table.seid_enabled = 1;
1177 }
1178
1179 void smc_clc_exit(void)
1180 {
1181         smc_clc_ueid_remove(NULL);
1182 }