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 (!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                         return false;
 396                 if (hdr->typev1 == SMC_TYPE_R &&
 397                     ntohs(hdr->length) < SMCR_CLC_ACCEPT_CONFIRM_LEN_V2)
 398                         return false;
 399         }
 400         return true;
 401 }
 402
 403 /* check arriving CLC decline */
 404 static bool
 405 smc_clc_msg_decl_valid(struct smc_clc_msg_decline *dclc)
 406 {
 407         struct smc_clc_msg_hdr *hdr = &dclc->hdr;
 408
 409         if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
 410                 return false;
 411         if (hdr->version == SMC_V1) {
 412                 if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline))
 413                         return false;
 414         } else {
 415                 if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline_v2))
 416                         return false;
 417         }
 418         return true;
 419 }
 420
 421 static int smc_clc_fill_fce(struct smc_clc_first_contact_ext_v2x *fce,
 422                             struct smc_init_info *ini)
 423 {
 424         int ret = sizeof(*fce);
 425
 426         memset(fce, 0, sizeof(*fce));
 427         fce->fce_v2_base.os_type = SMC_CLC_OS_LINUX;
 428         fce->fce_v2_base.release = ini->release_nr;
 429         memcpy(fce->fce_v2_base.hostname, smc_hostname, sizeof(smc_hostname));
 430         if (ini->is_smcd && ini->release_nr < SMC_RELEASE_1) {
 431                 ret = sizeof(struct smc_clc_first_contact_ext);
 432                 goto out;
 433         }
 434
 435         if (ini->release_nr >= SMC_RELEASE_1) {
 436                 if (!ini->is_smcd) {
 437                         fce->max_conns = ini->max_conns;
 438                         fce->max_links = ini->max_links;
 439                 }
 440         }
 441
 442 out:
 443         return ret;
 444 }
 445
 446 /* check if received message has a correct header length and contains valid
 447  * heading and trailing eyecatchers
 448  */
 449 static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl)
 450 {
 451         struct smc_clc_msg_accept_confirm_v2 *clc_v2;
 452         struct smc_clc_msg_proposal *pclc;
 453         struct smc_clc_msg_decline *dclc;
 454         struct smc_clc_msg_trail *trl;
 455
 456         if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
 457             memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
 458                 return false;
 459         switch (clcm->type) {
 460         case SMC_CLC_PROPOSAL:
 461                 pclc = (struct smc_clc_msg_proposal *)clcm;
 462                 if (!smc_clc_msg_prop_valid(pclc))
 463                         return false;
 464                 trl = (struct smc_clc_msg_trail *)
 465                         ((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl));
 466                 break;
 467         case SMC_CLC_ACCEPT:
 468         case SMC_CLC_CONFIRM:
 469                 clc_v2 = (struct smc_clc_msg_accept_confirm_v2 *)clcm;
 470                 if (!smc_clc_msg_acc_conf_valid(clc_v2))
 471                         return false;
 472                 trl = (struct smc_clc_msg_trail *)
 473                         ((u8 *)clc_v2 + ntohs(clc_v2->hdr.length) -
 474                                                         sizeof(*trl));
 475                 break;
 476         case SMC_CLC_DECLINE:
 477                 dclc = (struct smc_clc_msg_decline *)clcm;
 478                 if (!smc_clc_msg_decl_valid(dclc))
 479                         return false;
 480                 check_trl = false;
 481                 break;
 482         default:
 483                 return false;
 484         }
 485         if (check_trl &&
 486             memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
 487             memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
 488                 return false;
 489         return true;
 490 }
 491
 492 /* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */
 493 static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4,
 494                                  struct smc_clc_msg_proposal_prefix *prop)
 495 {
 496         struct in_device *in_dev = __in_dev_get_rcu(dst->dev);
 497         const struct in_ifaddr *ifa;
 498
 499         if (!in_dev)
 500                 return -ENODEV;
 501
 502         in_dev_for_each_ifa_rcu(ifa, in_dev) {
 503                 if (!inet_ifa_match(ipv4, ifa))
 504                         continue;
 505                 prop->prefix_len = inet_mask_len(ifa->ifa_mask);
 506                 prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask;
 507                 /* prop->ipv6_prefixes_cnt = 0; already done by memset before */
 508                 return 0;
 509         }
 510         return -ENOENT;
 511 }
 512
 513 /* fill CLC proposal msg with ipv6 prefixes from device */
 514 static int smc_clc_prfx_set6_rcu(struct dst_entry *dst,
 515                                  struct smc_clc_msg_proposal_prefix *prop,
 516                                  struct smc_clc_ipv6_prefix *ipv6_prfx)
 517 {
 518 #if IS_ENABLED(CONFIG_IPV6)
 519         struct inet6_dev *in6_dev = __in6_dev_get(dst->dev);
 520         struct inet6_ifaddr *ifa;
 521         int cnt = 0;
 522
 523         if (!in6_dev)
 524                 return -ENODEV;
 525         /* use a maximum of 8 IPv6 prefixes from device */
 526         list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
 527                 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
 528                         continue;
 529                 ipv6_addr_prefix(&ipv6_prfx[cnt].prefix,
 530                                  &ifa->addr, ifa->prefix_len);
 531                 ipv6_prfx[cnt].prefix_len = ifa->prefix_len;
 532                 cnt++;
 533                 if (cnt == SMC_CLC_MAX_V6_PREFIX)
 534                         break;
 535         }
 536         prop->ipv6_prefixes_cnt = cnt;
 537         if (cnt)
 538                 return 0;
 539 #endif
 540         return -ENOENT;
 541 }
 542
 543 /* retrieve and set prefixes in CLC proposal msg */
 544 static int smc_clc_prfx_set(struct socket *clcsock,
 545                             struct smc_clc_msg_proposal_prefix *prop,
 546                             struct smc_clc_ipv6_prefix *ipv6_prfx)
 547 {
 548         struct dst_entry *dst = sk_dst_get(clcsock->sk);
 549         struct sockaddr_storage addrs;
 550         struct sockaddr_in6 *addr6;
 551         struct sockaddr_in *addr;
 552         int rc = -ENOENT;
 553
 554         if (!dst) {
 555                 rc = -ENOTCONN;
 556                 goto out;
 557         }
 558         if (!dst->dev) {
 559                 rc = -ENODEV;
 560                 goto out_rel;
 561         }
 562         /* get address to which the internal TCP socket is bound */
 563         if (kernel_getsockname(clcsock, (struct sockaddr *)&addrs) < 0)
 564                 goto out_rel;
 565         /* analyze IP specific data of net_device belonging to TCP socket */
 566         addr6 = (struct sockaddr_in6 *)&addrs;
 567         rcu_read_lock();
 568         if (addrs.ss_family == PF_INET) {
 569                 /* IPv4 */
 570                 addr = (struct sockaddr_in *)&addrs;
 571                 rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop);
 572         } else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) {
 573                 /* mapped IPv4 address - peer is IPv4 only */
 574                 rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3],
 575                                            prop);
 576         } else {
 577                 /* IPv6 */
 578                 rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx);
 579         }
 580         rcu_read_unlock();
 581 out_rel:
 582         dst_release(dst);
 583 out:
 584         return rc;
 585 }
 586
 587 /* match ipv4 addrs of dev against addr in CLC proposal */
 588 static int smc_clc_prfx_match4_rcu(struct net_device *dev,
 589                                    struct smc_clc_msg_proposal_prefix *prop)
 590 {
 591         struct in_device *in_dev = __in_dev_get_rcu(dev);
 592         const struct in_ifaddr *ifa;
 593
 594         if (!in_dev)
 595                 return -ENODEV;
 596         in_dev_for_each_ifa_rcu(ifa, in_dev) {
 597                 if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) &&
 598                     inet_ifa_match(prop->outgoing_subnet, ifa))
 599                         return 0;
 600         }
 601
 602         return -ENOENT;
 603 }
 604
 605 /* match ipv6 addrs of dev against addrs in CLC proposal */
 606 static int smc_clc_prfx_match6_rcu(struct net_device *dev,
 607                                    struct smc_clc_msg_proposal_prefix *prop)
 608 {
 609 #if IS_ENABLED(CONFIG_IPV6)
 610         struct inet6_dev *in6_dev = __in6_dev_get(dev);
 611         struct smc_clc_ipv6_prefix *ipv6_prfx;
 612         struct inet6_ifaddr *ifa;
 613         int i, max;
 614
 615         if (!in6_dev)
 616                 return -ENODEV;
 617         /* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */
 618         ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop));
 619         max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX);
 620         list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
 621                 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
 622                         continue;
 623                 for (i = 0; i < max; i++) {
 624                         if (ifa->prefix_len == ipv6_prfx[i].prefix_len &&
 625                             ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix,
 626                                               ifa->prefix_len))
 627                                 return 0;
 628                 }
 629         }
 630 #endif
 631         return -ENOENT;
 632 }
 633
 634 /* check if proposed prefixes match one of our device prefixes */
 635 int smc_clc_prfx_match(struct socket *clcsock,
 636                        struct smc_clc_msg_proposal_prefix *prop)
 637 {
 638         struct dst_entry *dst = sk_dst_get(clcsock->sk);
 639         int rc;
 640
 641         if (!dst) {
 642                 rc = -ENOTCONN;
 643                 goto out;
 644         }
 645         if (!dst->dev) {
 646                 rc = -ENODEV;
 647                 goto out_rel;
 648         }
 649         rcu_read_lock();
 650         if (!prop->ipv6_prefixes_cnt)
 651                 rc = smc_clc_prfx_match4_rcu(dst->dev, prop);
 652         else
 653                 rc = smc_clc_prfx_match6_rcu(dst->dev, prop);
 654         rcu_read_unlock();
 655 out_rel:
 656         dst_release(dst);
 657 out:
 658         return rc;
 659 }
 660
 661 /* Wait for data on the tcp-socket, analyze received data
 662  * Returns:
 663  * 0 if success and it was not a decline that we received.
 664  * SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send.
 665  * clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise.
 666  */
 667 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
 668                      u8 expected_type, unsigned long timeout)
 669 {
 670         long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo;
 671         struct sock *clc_sk = smc->clcsock->sk;
 672         struct smc_clc_msg_hdr *clcm = buf;
 673         struct msghdr msg = {NULL, 0};
 674         int reason_code = 0;
 675         struct kvec vec = {buf, buflen};
 676         int len, datlen, recvlen;
 677         bool check_trl = true;
 678         int krflags;
 679
 680         /* peek the first few bytes to determine length of data to receive
 681          * so we don't consume any subsequent CLC message or payload data
 682          * in the TCP byte stream
 683          */
 684         /*
 685          * Caller must make sure that buflen is no less than
 686          * sizeof(struct smc_clc_msg_hdr)
 687          */
 688         krflags = MSG_PEEK | MSG_WAITALL;
 689         clc_sk->sk_rcvtimeo = timeout;
 690         iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1,
 691                         sizeof(struct smc_clc_msg_hdr));
 692         len = sock_recvmsg(smc->clcsock, &msg, krflags);
 693         if (signal_pending(current)) {
 694                 reason_code = -EINTR;
 695                 clc_sk->sk_err = EINTR;
 696                 smc->sk.sk_err = EINTR;
 697                 goto out;
 698         }
 699         if (clc_sk->sk_err) {
 700                 reason_code = -clc_sk->sk_err;
 701                 if (clc_sk->sk_err == EAGAIN &&
 702                     expected_type == SMC_CLC_DECLINE)
 703                         clc_sk->sk_err = 0; /* reset for fallback usage */
 704                 else
 705                         smc->sk.sk_err = clc_sk->sk_err;
 706                 goto out;
 707         }
 708         if (!len) { /* peer has performed orderly shutdown */
 709                 smc->sk.sk_err = ECONNRESET;
 710                 reason_code = -ECONNRESET;
 711                 goto out;
 712         }
 713         if (len < 0) {
 714                 if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE)
 715                         smc->sk.sk_err = -len;
 716                 reason_code = len;
 717                 goto out;
 718         }
 719         datlen = ntohs(clcm->length);
 720         if ((len < sizeof(struct smc_clc_msg_hdr)) ||
 721             (clcm->version < SMC_V1) ||
 722             ((clcm->type != SMC_CLC_DECLINE) &&
 723              (clcm->type != expected_type))) {
 724                 smc->sk.sk_err = EPROTO;
 725                 reason_code = -EPROTO;
 726                 goto out;
 727         }
 728
 729         /* receive the complete CLC message */
 730         memset(&msg, 0, sizeof(struct msghdr));
 731         if (datlen > buflen) {
 732                 check_trl = false;
 733                 recvlen = buflen;
 734         } else {
 735                 recvlen = datlen;
 736         }
 737         iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
 738         krflags = MSG_WAITALL;
 739         len = sock_recvmsg(smc->clcsock, &msg, krflags);
 740         if (len < recvlen || !smc_clc_msg_hdr_valid(clcm, check_trl)) {
 741                 smc->sk.sk_err = EPROTO;
 742                 reason_code = -EPROTO;
 743                 goto out;
 744         }
 745         datlen -= len;
 746         while (datlen) {
 747                 u8 tmp[SMC_CLC_RECV_BUF_LEN];
 748
 749                 vec.iov_base = &tmp;
 750                 vec.iov_len = SMC_CLC_RECV_BUF_LEN;
 751                 /* receive remaining proposal message */
 752                 recvlen = datlen > SMC_CLC_RECV_BUF_LEN ?
 753                                                 SMC_CLC_RECV_BUF_LEN : datlen;
 754                 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
 755                 len = sock_recvmsg(smc->clcsock, &msg, krflags);
 756                 datlen -= len;
 757         }
 758         if (clcm->type == SMC_CLC_DECLINE) {
 759                 struct smc_clc_msg_decline *dclc;
 760
 761                 dclc = (struct smc_clc_msg_decline *)clcm;
 762                 reason_code = SMC_CLC_DECL_PEERDECL;
 763                 smc->peer_diagnosis = ntohl(dclc->peer_diagnosis);
 764                 if (((struct smc_clc_msg_decline *)buf)->hdr.typev2 &
 765                                                 SMC_FIRST_CONTACT_MASK) {
 766                         smc->conn.lgr->sync_err = 1;
 767                         smc_lgr_terminate_sched(smc->conn.lgr);
 768                 }
 769         }
 770
 771 out:
 772         clc_sk->sk_rcvtimeo = rcvtimeo;
 773         return reason_code;
 774 }
 775
 776 /* send CLC DECLINE message across internal TCP socket */
 777 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version)
 778 {
 779         struct smc_clc_msg_decline *dclc_v1;
 780         struct smc_clc_msg_decline_v2 dclc;
 781         struct msghdr msg;
 782         int len, send_len;
 783         struct kvec vec;
 784
 785         dclc_v1 = (struct smc_clc_msg_decline *)&dclc;
 786         memset(&dclc, 0, sizeof(dclc));
 787         memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
 788         dclc.hdr.type = SMC_CLC_DECLINE;
 789         dclc.hdr.version = version;
 790         dclc.os_type = version == SMC_V1 ? 0 : SMC_CLC_OS_LINUX;
 791         dclc.hdr.typev2 = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ?
 792                                                 SMC_FIRST_CONTACT_MASK : 0;
 793         if ((!smc_conn_lgr_valid(&smc->conn) || !smc->conn.lgr->is_smcd) &&
 794             smc_ib_is_valid_local_systemid())
 795                 memcpy(dclc.id_for_peer, local_systemid,
 796                        sizeof(local_systemid));
 797         dclc.peer_diagnosis = htonl(peer_diag_info);
 798         if (version == SMC_V1) {
 799                 memcpy(dclc_v1->trl.eyecatcher, SMC_EYECATCHER,
 800                        sizeof(SMC_EYECATCHER));
 801                 send_len = sizeof(*dclc_v1);
 802         } else {
 803                 memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER,
 804                        sizeof(SMC_EYECATCHER));
 805                 send_len = sizeof(dclc);
 806         }
 807         dclc.hdr.length = htons(send_len);
 808
 809         memset(&msg, 0, sizeof(msg));
 810         vec.iov_base = &dclc;
 811         vec.iov_len = send_len;
 812         len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, send_len);
 813         if (len < 0 || len < send_len)
 814                 len = -EPROTO;
 815         return len > 0 ? 0 : len;
 816 }
 817
 818 /* send CLC PROPOSAL message across internal TCP socket */
 819 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini)
 820 {
 821         struct smc_clc_smcd_v2_extension *smcd_v2_ext;
 822         struct smc_clc_msg_proposal_prefix *pclc_prfx;
 823         struct smc_clc_msg_proposal *pclc_base;
 824         struct smc_clc_smcd_gid_chid *gidchids;
 825         struct smc_clc_msg_proposal_area *pclc;
 826         struct smc_clc_ipv6_prefix *ipv6_prfx;
 827         struct smc_clc_v2_extension *v2_ext;
 828         struct smc_clc_msg_smcd *pclc_smcd;
 829         struct smc_clc_msg_trail *trl;
 830         struct smcd_dev *smcd;
 831         int len, i, plen, rc;
 832         int reason_code = 0;
 833         struct kvec vec[8];
 834         struct msghdr msg;
 835
 836         pclc = kzalloc(sizeof(*pclc), GFP_KERNEL);
 837         if (!pclc)
 838                 return -ENOMEM;
 839
 840         pclc_base = &pclc->pclc_base;
 841         pclc_smcd = &pclc->pclc_smcd;
 842         pclc_prfx = &pclc->pclc_prfx;
 843         ipv6_prfx = pclc->pclc_prfx_ipv6;
 844         v2_ext = &pclc->pclc_v2_ext;
 845         smcd_v2_ext = &pclc->pclc_smcd_v2_ext;
 846         gidchids = pclc->pclc_gidchids;
 847         trl = &pclc->pclc_trl;
 848
 849         pclc_base->hdr.version = SMC_V2;
 850         pclc_base->hdr.typev1 = ini->smc_type_v1;
 851         pclc_base->hdr.typev2 = ini->smc_type_v2;
 852         plen = sizeof(*pclc_base) + sizeof(*pclc_smcd) + sizeof(*trl);
 853
 854         /* retrieve ip prefixes for CLC proposal msg */
 855         if (ini->smc_type_v1 != SMC_TYPE_N) {
 856                 rc = smc_clc_prfx_set(smc->clcsock, pclc_prfx, ipv6_prfx);
 857                 if (rc) {
 858                         if (ini->smc_type_v2 == SMC_TYPE_N) {
 859                                 kfree(pclc);
 860                                 return SMC_CLC_DECL_CNFERR;
 861                         }
 862                         pclc_base->hdr.typev1 = SMC_TYPE_N;
 863                 } else {
 864                         pclc_base->iparea_offset = htons(sizeof(*pclc_smcd));
 865                         plen += sizeof(*pclc_prfx) +
 866                                         pclc_prfx->ipv6_prefixes_cnt *
 867                                         sizeof(ipv6_prfx[0]);
 868                 }
 869         }
 870
 871         /* build SMC Proposal CLC message */
 872         memcpy(pclc_base->hdr.eyecatcher, SMC_EYECATCHER,
 873                sizeof(SMC_EYECATCHER));
 874         pclc_base->hdr.type = SMC_CLC_PROPOSAL;
 875         if (smcr_indicated(ini->smc_type_v1)) {
 876                 /* add SMC-R specifics */
 877                 memcpy(pclc_base->lcl.id_for_peer, local_systemid,
 878                        sizeof(local_systemid));
 879                 memcpy(pclc_base->lcl.gid, ini->ib_gid, SMC_GID_SIZE);
 880                 memcpy(pclc_base->lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1],
 881                        ETH_ALEN);
 882         }
 883         if (smcd_indicated(ini->smc_type_v1)) {
 884                 /* add SMC-D specifics */
 885                 if (ini->ism_dev[0]) {
 886                         smcd = ini->ism_dev[0];
 887                         pclc_smcd->ism.gid =
 888                                 htonll(smcd->ops->get_local_gid(smcd));
 889                         pclc_smcd->ism.chid =
 890                                 htons(smc_ism_get_chid(ini->ism_dev[0]));
 891                 }
 892         }
 893         if (ini->smc_type_v2 == SMC_TYPE_N) {
 894                 pclc_smcd->v2_ext_offset = 0;
 895         } else {
 896                 struct smc_clc_eid_entry *ueident;
 897                 u16 v2_ext_offset;
 898
 899                 v2_ext->hdr.flag.release = SMC_RELEASE;
 900                 v2_ext_offset = sizeof(*pclc_smcd) -
 901                         offsetofend(struct smc_clc_msg_smcd, v2_ext_offset);
 902                 if (ini->smc_type_v1 != SMC_TYPE_N)
 903                         v2_ext_offset += sizeof(*pclc_prfx) +
 904                                                 pclc_prfx->ipv6_prefixes_cnt *
 905                                                 sizeof(ipv6_prfx[0]);
 906                 pclc_smcd->v2_ext_offset = htons(v2_ext_offset);
 907                 plen += sizeof(*v2_ext);
 908
 909                 read_lock(&smc_clc_eid_table.lock);
 910                 v2_ext->hdr.eid_cnt = smc_clc_eid_table.ueid_cnt;
 911                 plen += smc_clc_eid_table.ueid_cnt * SMC_MAX_EID_LEN;
 912                 i = 0;
 913                 list_for_each_entry(ueident, &smc_clc_eid_table.list, list) {
 914                         memcpy(v2_ext->user_eids[i++], ueident->eid,
 915                                sizeof(ueident->eid));
 916                 }
 917                 read_unlock(&smc_clc_eid_table.lock);
 918         }
 919         if (smcd_indicated(ini->smc_type_v2)) {
 920                 u8 *eid = NULL;
 921
 922                 v2_ext->hdr.flag.seid = smc_clc_eid_table.seid_enabled;
 923                 v2_ext->hdr.ism_gid_cnt = ini->ism_offered_cnt;
 924                 v2_ext->hdr.smcd_v2_ext_offset = htons(sizeof(*v2_ext) -
 925                                 offsetofend(struct smc_clnt_opts_area_hdr,
 926                                             smcd_v2_ext_offset) +
 927                                 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);
 928                 smc_ism_get_system_eid(&eid);
 929                 if (eid && v2_ext->hdr.flag.seid)
 930                         memcpy(smcd_v2_ext->system_eid, eid, SMC_MAX_EID_LEN);
 931                 plen += sizeof(*smcd_v2_ext);
 932                 if (ini->ism_offered_cnt) {
 933                         for (i = 1; i <= ini->ism_offered_cnt; i++) {
 934                                 smcd = ini->ism_dev[i];
 935                                 gidchids[i - 1].gid =
 936                                         htonll(smcd->ops->get_local_gid(smcd));
 937                                 gidchids[i - 1].chid =
 938                                         htons(smc_ism_get_chid(ini->ism_dev[i]));
 939                         }
 940                         plen += ini->ism_offered_cnt *
 941                                 sizeof(struct smc_clc_smcd_gid_chid);
 942                 }
 943         }
 944         if (smcr_indicated(ini->smc_type_v2)) {
 945                 memcpy(v2_ext->roce, ini->smcrv2.ib_gid_v2, SMC_GID_SIZE);
 946                 v2_ext->max_conns = SMC_CONN_PER_LGR_PREFER;
 947                 v2_ext->max_links = SMC_LINKS_PER_LGR_MAX_PREFER;
 948         }
 949
 950         pclc_base->hdr.length = htons(plen);
 951         memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
 952
 953         /* send SMC Proposal CLC message */
 954         memset(&msg, 0, sizeof(msg));
 955         i = 0;
 956         vec[i].iov_base = pclc_base;
 957         vec[i++].iov_len = sizeof(*pclc_base);
 958         vec[i].iov_base = pclc_smcd;
 959         vec[i++].iov_len = sizeof(*pclc_smcd);
 960         if (ini->smc_type_v1 != SMC_TYPE_N) {
 961                 vec[i].iov_base = pclc_prfx;
 962                 vec[i++].iov_len = sizeof(*pclc_prfx);
 963                 if (pclc_prfx->ipv6_prefixes_cnt > 0) {
 964                         vec[i].iov_base = ipv6_prfx;
 965                         vec[i++].iov_len = pclc_prfx->ipv6_prefixes_cnt *
 966                                            sizeof(ipv6_prfx[0]);
 967                 }
 968         }
 969         if (ini->smc_type_v2 != SMC_TYPE_N) {
 970                 vec[i].iov_base = v2_ext;
 971                 vec[i++].iov_len = sizeof(*v2_ext) +
 972                                    (v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);
 973                 if (smcd_indicated(ini->smc_type_v2)) {
 974                         vec[i].iov_base = smcd_v2_ext;
 975                         vec[i++].iov_len = sizeof(*smcd_v2_ext);
 976                         if (ini->ism_offered_cnt) {
 977                                 vec[i].iov_base = gidchids;
 978                                 vec[i++].iov_len = ini->ism_offered_cnt *
 979                                         sizeof(struct smc_clc_smcd_gid_chid);
 980                         }
 981                 }
 982         }
 983         vec[i].iov_base = trl;
 984         vec[i++].iov_len = sizeof(*trl);
 985         /* due to the few bytes needed for clc-handshake this cannot block */
 986         len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen);
 987         if (len < 0) {
 988                 smc->sk.sk_err = smc->clcsock->sk->sk_err;
 989                 reason_code = -smc->sk.sk_err;
 990         } else if (len < ntohs(pclc_base->hdr.length)) {
 991                 reason_code = -ENETUNREACH;
 992                 smc->sk.sk_err = -reason_code;
 993         }
 994
 995         kfree(pclc);
 996         return reason_code;
 997 }
 998
 999 /* build and send CLC CONFIRM / ACCEPT message */
1000 static int smc_clc_send_confirm_accept(struct smc_sock *smc,
1001                                        struct smc_clc_msg_accept_confirm_v2 *clc_v2,
1002                                        int first_contact, u8 version,
1003                                        u8 *eid, struct smc_init_info *ini)
1004 {
1005         struct smc_connection *conn = &smc->conn;
1006         struct smc_clc_first_contact_ext_v2x fce;
1007         struct smc_clc_msg_accept_confirm *clc;
1008         struct smc_clc_fce_gid_ext gle;
1009         struct smc_clc_msg_trail trl;
1010         int i, len, fce_len;
1011         struct kvec vec[5];
1012         struct msghdr msg;
1013
1014         /* send SMC Confirm CLC msg */
1015         clc = (struct smc_clc_msg_accept_confirm *)clc_v2;
1016         clc->hdr.version = version;     /* SMC version */
1017         if (first_contact)
1018                 clc->hdr.typev2 |= SMC_FIRST_CONTACT_MASK;
1019         if (conn->lgr->is_smcd) {
1020                 /* SMC-D specific settings */
1021                 memcpy(clc->hdr.eyecatcher, SMCD_EYECATCHER,
1022                        sizeof(SMCD_EYECATCHER));
1023                 clc->hdr.typev1 = SMC_TYPE_D;
1024                 clc->d0.gid =
1025                         conn->lgr->smcd->ops->get_local_gid(conn->lgr->smcd);
1026                 clc->d0.token = conn->rmb_desc->token;
1027                 clc->d0.dmbe_size = conn->rmbe_size_comp;
1028                 clc->d0.dmbe_idx = 0;
1029                 memcpy(&clc->d0.linkid, conn->lgr->id, SMC_LGR_ID_SIZE);
1030                 if (version == SMC_V1) {
1031                         clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
1032                 } else {
1033                         clc_v2->d1.chid =
1034                                 htons(smc_ism_get_chid(conn->lgr->smcd));
1035                         if (eid && eid[0])
1036                                 memcpy(clc_v2->d1.eid, eid, SMC_MAX_EID_LEN);
1037                         len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2;
1038                         if (first_contact) {
1039                                 fce_len = smc_clc_fill_fce(&fce, ini);
1040                                 len += fce_len;
1041                         }
1042                         clc_v2->hdr.length = htons(len);
1043                 }
1044                 memcpy(trl.eyecatcher, SMCD_EYECATCHER,
1045                        sizeof(SMCD_EYECATCHER));
1046         } else {
1047                 struct smc_link *link = conn->lnk;
1048
1049                 /* SMC-R specific settings */
1050                 memcpy(clc->hdr.eyecatcher, SMC_EYECATCHER,
1051                        sizeof(SMC_EYECATCHER));
1052                 clc->hdr.typev1 = SMC_TYPE_R;
1053                 clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
1054                 memcpy(clc->r0.lcl.id_for_peer, local_systemid,
1055                        sizeof(local_systemid));
1056                 memcpy(&clc->r0.lcl.gid, link->gid, SMC_GID_SIZE);
1057                 memcpy(&clc->r0.lcl.mac, &link->smcibdev->mac[link->ibport - 1],
1058                        ETH_ALEN);
1059                 hton24(clc->r0.qpn, link->roce_qp->qp_num);
1060                 clc->r0.rmb_rkey =
1061                         htonl(conn->rmb_desc->mr[link->link_idx]->rkey);
1062                 clc->r0.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */
1063                 clc->r0.rmbe_alert_token = htonl(conn->alert_token_local);
1064                 switch (clc->hdr.type) {
1065                 case SMC_CLC_ACCEPT:
1066                         clc->r0.qp_mtu = link->path_mtu;
1067                         break;
1068                 case SMC_CLC_CONFIRM:
1069                         clc->r0.qp_mtu = min(link->path_mtu, link->peer_mtu);
1070                         break;
1071                 }
1072                 clc->r0.rmbe_size = conn->rmbe_size_comp;
1073                 clc->r0.rmb_dma_addr = conn->rmb_desc->is_vm ?
1074                         cpu_to_be64((uintptr_t)conn->rmb_desc->cpu_addr) :
1075                         cpu_to_be64((u64)sg_dma_address
1076                                     (conn->rmb_desc->sgt[link->link_idx].sgl));
1077                 hton24(clc->r0.psn, link->psn_initial);
1078                 if (version == SMC_V1) {
1079                         clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
1080                 } else {
1081                         if (eid && eid[0])
1082                                 memcpy(clc_v2->r1.eid, eid, SMC_MAX_EID_LEN);
1083                         len = SMCR_CLC_ACCEPT_CONFIRM_LEN_V2;
1084                         if (first_contact) {
1085                                 fce_len = smc_clc_fill_fce(&fce, ini);
1086                                 len += fce_len;
1087                                 fce.fce_v2_base.v2_direct = !link->lgr->uses_gateway;
1088                                 if (clc->hdr.type == SMC_CLC_CONFIRM) {
1089                                         memset(&gle, 0, sizeof(gle));
1090                                         gle.gid_cnt = ini->smcrv2.gidlist.len;
1091                                         len += sizeof(gle);
1092                                         len += gle.gid_cnt * sizeof(gle.gid[0]);
1093                                 }
1094                         }
1095                         clc_v2->hdr.length = htons(len);
1096                 }
1097                 memcpy(trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
1098         }
1099
1100         memset(&msg, 0, sizeof(msg));
1101         i = 0;
1102         vec[i].iov_base = clc_v2;
1103         if (version > SMC_V1)
1104                 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ?
1105                                         SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 :
1106                                         SMCR_CLC_ACCEPT_CONFIRM_LEN_V2) -
1107                                    sizeof(trl);
1108         else
1109                 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ?
1110                                                 SMCD_CLC_ACCEPT_CONFIRM_LEN :
1111                                                 SMCR_CLC_ACCEPT_CONFIRM_LEN) -
1112                                    sizeof(trl);
1113         if (version > SMC_V1 && first_contact) {
1114                 vec[i].iov_base = &fce;
1115                 vec[i++].iov_len = fce_len;
1116                 if (!conn->lgr->is_smcd) {
1117                         if (clc->hdr.type == SMC_CLC_CONFIRM) {
1118                                 vec[i].iov_base = &gle;
1119                                 vec[i++].iov_len = sizeof(gle);
1120                                 vec[i].iov_base = &ini->smcrv2.gidlist.list;
1121                                 vec[i++].iov_len = gle.gid_cnt *
1122                                                    sizeof(gle.gid[0]);
1123                         }
1124                 }
1125         }
1126         vec[i].iov_base = &trl;
1127         vec[i++].iov_len = sizeof(trl);
1128         return kernel_sendmsg(smc->clcsock, &msg, vec, 1,
1129                               ntohs(clc->hdr.length));
1130 }
1131
1132 /* send CLC CONFIRM message across internal TCP socket */
1133 int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
1134                          u8 version, u8 *eid, struct smc_init_info *ini)
1135 {
1136         struct smc_clc_msg_accept_confirm_v2 cclc_v2;
1137         int reason_code = 0;
1138         int len;
1139
1140         /* send SMC Confirm CLC msg */
1141         memset(&cclc_v2, 0, sizeof(cclc_v2));
1142         cclc_v2.hdr.type = SMC_CLC_CONFIRM;
1143         len = smc_clc_send_confirm_accept(smc, &cclc_v2, clnt_first_contact,
1144                                           version, eid, ini);
1145         if (len < ntohs(cclc_v2.hdr.length)) {
1146                 if (len >= 0) {
1147                         reason_code = -ENETUNREACH;
1148                         smc->sk.sk_err = -reason_code;
1149                 } else {
1150                         smc->sk.sk_err = smc->clcsock->sk->sk_err;
1151                         reason_code = -smc->sk.sk_err;
1152                 }
1153         }
1154         return reason_code;
1155 }
1156
1157 /* send CLC ACCEPT message across internal TCP socket */
1158 int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact,
1159                         u8 version, u8 *negotiated_eid, struct smc_init_info *ini)
1160 {
1161         struct smc_clc_msg_accept_confirm_v2 aclc_v2;
1162         int len;
1163
1164         memset(&aclc_v2, 0, sizeof(aclc_v2));
1165         aclc_v2.hdr.type = SMC_CLC_ACCEPT;
1166         len = smc_clc_send_confirm_accept(new_smc, &aclc_v2, srv_first_contact,
1167                                           version, negotiated_eid, ini);
1168         if (len < ntohs(aclc_v2.hdr.length))
1169                 len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err;
1170
1171         return len > 0 ? 0 : len;
1172 }
1173
1174 int smc_clc_srv_v2x_features_validate(struct smc_clc_msg_proposal *pclc,
1175                                       struct smc_init_info *ini)
1176 {
1177         struct smc_clc_v2_extension *pclc_v2_ext;
1178
1179         ini->max_conns = SMC_CONN_PER_LGR_MAX;
1180         ini->max_links = SMC_LINKS_ADD_LNK_MAX;
1181
1182         if ((!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) ||
1183             ini->release_nr < SMC_RELEASE_1)
1184                 return 0;
1185
1186         pclc_v2_ext = smc_get_clc_v2_ext(pclc);
1187         if (!pclc_v2_ext)
1188                 return SMC_CLC_DECL_NOV2EXT;
1189
1190         if (ini->smcr_version & SMC_V2) {
1191                 ini->max_conns = min_t(u8, pclc_v2_ext->max_conns, SMC_CONN_PER_LGR_PREFER);
1192                 if (ini->max_conns < SMC_CONN_PER_LGR_MIN)
1193                         return SMC_CLC_DECL_MAXCONNERR;
1194
1195                 ini->max_links = min_t(u8, pclc_v2_ext->max_links, SMC_LINKS_PER_LGR_MAX_PREFER);
1196                 if (ini->max_links < SMC_LINKS_ADD_LNK_MIN)
1197                         return SMC_CLC_DECL_MAXLINKERR;
1198         }
1199
1200         return 0;
1201 }
1202
1203 int smc_clc_clnt_v2x_features_validate(struct smc_clc_first_contact_ext *fce,
1204                                        struct smc_init_info *ini)
1205 {
1206         struct smc_clc_first_contact_ext_v2x *fce_v2x =
1207                 (struct smc_clc_first_contact_ext_v2x *)fce;
1208
1209         if (ini->release_nr < SMC_RELEASE_1)
1210                 return 0;
1211
1212         if (!ini->is_smcd) {
1213                 if (fce_v2x->max_conns < SMC_CONN_PER_LGR_MIN)
1214                         return SMC_CLC_DECL_MAXCONNERR;
1215                 ini->max_conns = fce_v2x->max_conns;
1216
1217                 if (fce_v2x->max_links > SMC_LINKS_ADD_LNK_MAX ||
1218                     fce_v2x->max_links < SMC_LINKS_ADD_LNK_MIN)
1219                         return SMC_CLC_DECL_MAXLINKERR;
1220                 ini->max_links = fce_v2x->max_links;
1221         }
1222
1223         return 0;
1224 }
1225
1226 int smc_clc_v2x_features_confirm_check(struct smc_clc_msg_accept_confirm *cclc,
1227                                        struct smc_init_info *ini)
1228 {
1229         struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
1230                 (struct smc_clc_msg_accept_confirm_v2 *)cclc;
1231         struct smc_clc_first_contact_ext *fce =
1232                 smc_get_clc_first_contact_ext(clc_v2, ini->is_smcd);
1233         struct smc_clc_first_contact_ext_v2x *fce_v2x =
1234                 (struct smc_clc_first_contact_ext_v2x *)fce;
1235
1236         if (cclc->hdr.version == SMC_V1 ||
1237             !(cclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
1238                 return 0;
1239
1240         if (ini->release_nr != fce->release)
1241                 return SMC_CLC_DECL_RELEASEERR;
1242
1243         if (fce->release < SMC_RELEASE_1)
1244                 return 0;
1245
1246         if (!ini->is_smcd) {
1247                 if (fce_v2x->max_conns != ini->max_conns)
1248                         return SMC_CLC_DECL_MAXCONNERR;
1249                 if (fce_v2x->max_links != ini->max_links)
1250                         return SMC_CLC_DECL_MAXLINKERR;
1251         }
1252
1253         return 0;
1254 }
1255
1256 void smc_clc_get_hostname(u8 **host)
1257 {
1258         *host = &smc_hostname[0];
1259 }
1260
1261 void __init smc_clc_init(void)
1262 {
1263         struct new_utsname *u;
1264
1265         memset(smc_hostname, _S, sizeof(smc_hostname)); /* ASCII blanks */
1266         u = utsname();
1267         memcpy(smc_hostname, u->nodename,
1268                min_t(size_t, strlen(u->nodename), sizeof(smc_hostname)));
1269
1270         INIT_LIST_HEAD(&smc_clc_eid_table.list);
1271         rwlock_init(&smc_clc_eid_table.lock);
1272         smc_clc_eid_table.ueid_cnt = 0;
1273         smc_clc_eid_table.seid_enabled = 1;
1274 }
1275
1276 void smc_clc_exit(void)
1277 {
1278         smc_clc_ueid_remove(NULL);
1279 }