smc/smc_clc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  Shared Memory Communications over RDMA (SMC-R) and RoCE
   4  *
   5  *  CLC (connection layer control) handshake over initial TCP socket to
   6  *  prepare for RDMA traffic
   7  *
   8  *  Copyright IBM Corp. 2016, 2018
   9  *
  10  *  Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
  11  */
  12
  13 #include <linux/in.h>
  14 #include <linux/inetdevice.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/sched/signal.h>
  17 #include <linux/utsname.h>
  18 #include <linux/ctype.h>
  19
  20 #include <net/addrconf.h>
  21 #include <net/sock.h>
  22 #include <net/tcp.h>
  23
  24 #include "smc.h"
  25 #include "smc_core.h"
  26 #include "smc_clc.h"
  27 #include "smc_ib.h"
  28 #include "smc_ism.h"
  29 #include "smc_netlink.h"
  30
  31 #define SMCR_CLC_ACCEPT_CONFIRM_LEN 68
  32 #define SMCD_CLC_ACCEPT_CONFIRM_LEN 48
  33 #define SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 78
  34 #define SMCR_CLC_ACCEPT_CONFIRM_LEN_V2 108
  35 #define SMC_CLC_RECV_BUF_LEN    100
  36
  37 /* eye catcher "SMCR" EBCDIC for CLC messages */
  38 static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'};
  39 /* eye catcher "SMCD" EBCDIC for CLC messages */
  40 static const char SMCD_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xc4'};
  41
  42 static u8 smc_hostname[SMC_MAX_HOSTNAME_LEN];
  43
  44 struct smc_clc_eid_table {
  45         rwlock_t lock;
  46         struct list_head list;
  47         u8 ueid_cnt;
  48         u8 seid_enabled;
  49 };
  50
  51 static struct smc_clc_eid_table smc_clc_eid_table;
  52
  53 struct smc_clc_eid_entry {
  54         struct list_head list;
  55         u8 eid[SMC_MAX_EID_LEN];
  56 };
  57
  58 /* The size of a user EID is 32 characters.
  59  * Valid characters should be (single-byte character set) A-Z, 0-9, '.' and '-'.
  60  * Blanks should only be used to pad to the expected size.
  61  * First character must be alphanumeric.
  62  */
  63 static bool smc_clc_ueid_valid(char *ueid)
  64 {
  65         char *end = ueid + SMC_MAX_EID_LEN;
  66
  67         while (--end >= ueid && isspace(*end))
  68                 ;
  69         if (end < ueid)
  70                 return false;
  71         if (!isalnum(*ueid) || islower(*ueid))
  72                 return false;
  73         while (ueid <= end) {
  74                 if ((!isalnum(*ueid) || islower(*ueid)) && *ueid != '.' &&
  75                     *ueid != '-')
  76                         return false;
  77                 ueid++;
  78         }
  79         return true;
  80 }
  81
  82 static int smc_clc_ueid_add(char *ueid)
  83 {
  84         struct smc_clc_eid_entry *new_ueid, *tmp_ueid;
  85         int rc;
  86
  87         if (!smc_clc_ueid_valid(ueid))
  88                 return -EINVAL;
  89
  90         /* add a new ueid entry to the ueid table if there isn't one */
  91         new_ueid = kzalloc(sizeof(*new_ueid), GFP_KERNEL);
  92         if (!new_ueid)
  93                 return -ENOMEM;
  94         memcpy(new_ueid->eid, ueid, SMC_MAX_EID_LEN);
  95
  96         write_lock(&smc_clc_eid_table.lock);
  97         if (smc_clc_eid_table.ueid_cnt >= SMC_MAX_UEID) {
  98                 rc = -ERANGE;
  99                 goto err_out;
 100         }
 101         list_for_each_entry(tmp_ueid, &smc_clc_eid_table.list, list) {
 102                 if (!memcmp(tmp_ueid->eid, ueid, SMC_MAX_EID_LEN)) {
 103                         rc = -EEXIST;
 104                         goto err_out;
 105                 }
 106         }
 107         list_add_tail(&new_ueid->list, &smc_clc_eid_table.list);
 108         smc_clc_eid_table.ueid_cnt++;
 109         write_unlock(&smc_clc_eid_table.lock);
 110         return 0;
 111
 112 err_out:
 113         write_unlock(&smc_clc_eid_table.lock);
 114         kfree(new_ueid);
 115         return rc;
 116 }
 117
 118 int smc_clc_ueid_count(void)
 119 {
 120         int count;
 121
 122         read_lock(&smc_clc_eid_table.lock);
 123         count = smc_clc_eid_table.ueid_cnt;
 124         read_unlock(&smc_clc_eid_table.lock);
 125
 126         return count;
 127 }
 128
 129 int smc_nl_add_ueid(struct sk_buff *skb, struct genl_info *info)
 130 {
 131         struct nlattr *nla_ueid = info->attrs[SMC_NLA_EID_TABLE_ENTRY];
 132         char *ueid;
 133
 134         if (!nla_ueid || nla_len(nla_ueid) != SMC_MAX_EID_LEN + 1)
 135                 return -EINVAL;
 136         ueid = (char *)nla_data(nla_ueid);
 137
 138         return smc_clc_ueid_add(ueid);
 139 }
 140
 141 /* remove one or all ueid entries from the table */
 142 static int smc_clc_ueid_remove(char *ueid)
 143 {
 144         struct smc_clc_eid_entry *lst_ueid, *tmp_ueid;
 145         int rc = -ENOENT;
 146
 147         /* remove table entry */
 148         write_lock(&smc_clc_eid_table.lock);
 149         list_for_each_entry_safe(lst_ueid, tmp_ueid, &smc_clc_eid_table.list,
 150                                  list) {
 151                 if (!ueid || !memcmp(lst_ueid->eid, ueid, SMC_MAX_EID_LEN)) {
 152                         list_del(&lst_ueid->list);
 153                         smc_clc_eid_table.ueid_cnt--;
 154                         kfree(lst_ueid);
 155                         rc = 0;
 156                 }
 157         }
 158 #if IS_ENABLED(CONFIG_S390)
 159         if (!rc && !smc_clc_eid_table.ueid_cnt) {
 160                 smc_clc_eid_table.seid_enabled = 1;
 161                 rc = -EAGAIN;   /* indicate success and enabling of seid */
 162         }
 163 #endif
 164         write_unlock(&smc_clc_eid_table.lock);
 165         return rc;
 166 }
 167
 168 int smc_nl_remove_ueid(struct sk_buff *skb, struct genl_info *info)
 169 {
 170         struct nlattr *nla_ueid = info->attrs[SMC_NLA_EID_TABLE_ENTRY];
 171         char *ueid;
 172
 173         if (!nla_ueid || nla_len(nla_ueid) != SMC_MAX_EID_LEN + 1)
 174                 return -EINVAL;
 175         ueid = (char *)nla_data(nla_ueid);
 176
 177         return smc_clc_ueid_remove(ueid);
 178 }
 179
 180 int smc_nl_flush_ueid(struct sk_buff *skb, struct genl_info *info)
 181 {
 182         smc_clc_ueid_remove(NULL);
 183         return 0;
 184 }
 185
 186 static int smc_nl_ueid_dumpinfo(struct sk_buff *skb, u32 portid, u32 seq,
 187                                 u32 flags, char *ueid)
 188 {
 189         char ueid_str[SMC_MAX_EID_LEN + 1];
 190         void *hdr;
 191
 192         hdr = genlmsg_put(skb, portid, seq, &smc_gen_nl_family,
 193                           flags, SMC_NETLINK_DUMP_UEID);
 194         if (!hdr)
 195                 return -ENOMEM;
 196         memcpy(ueid_str, ueid, SMC_MAX_EID_LEN);
 197         ueid_str[SMC_MAX_EID_LEN] = 0;
 198         if (nla_put_string(skb, SMC_NLA_EID_TABLE_ENTRY, ueid_str)) {
 199                 genlmsg_cancel(skb, hdr);
 200                 return -EMSGSIZE;
 201         }
 202         genlmsg_end(skb, hdr);
 203         return 0;
 204 }
 205
 206 static int _smc_nl_ueid_dump(struct sk_buff *skb, u32 portid, u32 seq,
 207                              int start_idx)
 208 {
 209         struct smc_clc_eid_entry *lst_ueid;
 210         int idx = 0;
 211
 212         read_lock(&smc_clc_eid_table.lock);
 213         list_for_each_entry(lst_ueid, &smc_clc_eid_table.list, list) {
 214                 if (idx++ < start_idx)
 215                         continue;
 216                 if (smc_nl_ueid_dumpinfo(skb, portid, seq, NLM_F_MULTI,
 217                                          lst_ueid->eid)) {
 218                         --idx;
 219                         break;
 220                 }
 221         }
 222         read_unlock(&smc_clc_eid_table.lock);
 223         return idx;
 224 }
 225
 226 int smc_nl_dump_ueid(struct sk_buff *skb, struct netlink_callback *cb)
 227 {
 228         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
 229         int idx;
 230
 231         idx = _smc_nl_ueid_dump(skb, NETLINK_CB(cb->skb).portid,
 232                                 cb->nlh->nlmsg_seq, cb_ctx->pos[0]);
 233
 234         cb_ctx->pos[0] = idx;
 235         return skb->len;
 236 }
 237
 238 int smc_nl_dump_seid(struct sk_buff *skb, struct netlink_callback *cb)
 239 {
 240         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
 241         char seid_str[SMC_MAX_EID_LEN + 1];
 242         u8 seid_enabled;
 243         void *hdr;
 244         u8 *seid;
 245
 246         if (cb_ctx->pos[0])
 247                 return skb->len;
 248
 249         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 250                           &smc_gen_nl_family, NLM_F_MULTI,
 251                           SMC_NETLINK_DUMP_SEID);
 252         if (!hdr)
 253                 return -ENOMEM;
 254         if (!smc_ism_is_v2_capable())
 255                 goto end;
 256
 257         smc_ism_get_system_eid(&seid);
 258         memcpy(seid_str, seid, SMC_MAX_EID_LEN);
 259         seid_str[SMC_MAX_EID_LEN] = 0;
 260         if (nla_put_string(skb, SMC_NLA_SEID_ENTRY, seid_str))
 261                 goto err;
 262         read_lock(&smc_clc_eid_table.lock);
 263         seid_enabled = smc_clc_eid_table.seid_enabled;
 264         read_unlock(&smc_clc_eid_table.lock);
 265         if (nla_put_u8(skb, SMC_NLA_SEID_ENABLED, seid_enabled))
 266                 goto err;
 267 end:
 268         genlmsg_end(skb, hdr);
 269         cb_ctx->pos[0]++;
 270         return skb->len;
 271 err:
 272         genlmsg_cancel(skb, hdr);
 273         return -EMSGSIZE;
 274 }
 275
 276 int smc_nl_enable_seid(struct sk_buff *skb, struct genl_info *info)
 277 {
 278 #if IS_ENABLED(CONFIG_S390)
 279         write_lock(&smc_clc_eid_table.lock);
 280         smc_clc_eid_table.seid_enabled = 1;
 281         write_unlock(&smc_clc_eid_table.lock);
 282         return 0;
 283 #else
 284         return -EOPNOTSUPP;
 285 #endif
 286 }
 287
 288 int smc_nl_disable_seid(struct sk_buff *skb, struct genl_info *info)
 289 {
 290         int rc = 0;
 291
 292 #if IS_ENABLED(CONFIG_S390)
 293         write_lock(&smc_clc_eid_table.lock);
 294         if (!smc_clc_eid_table.ueid_cnt)
 295                 rc = -ENOENT;
 296         else
 297                 smc_clc_eid_table.seid_enabled = 0;
 298         write_unlock(&smc_clc_eid_table.lock);
 299 #else
 300         rc = -EOPNOTSUPP;
 301 #endif
 302         return rc;
 303 }
 304
 305 static bool _smc_clc_match_ueid(u8 *peer_ueid)
 306 {
 307         struct smc_clc_eid_entry *tmp_ueid;
 308
 309         list_for_each_entry(tmp_ueid, &smc_clc_eid_table.list, list) {
 310                 if (!memcmp(tmp_ueid->eid, peer_ueid, SMC_MAX_EID_LEN))
 311                         return true;
 312         }
 313         return false;
 314 }
 315
 316 bool smc_clc_match_eid(u8 *negotiated_eid,
 317                        struct smc_clc_v2_extension *smc_v2_ext,
 318                        u8 *peer_eid, u8 *local_eid)
 319 {
 320         bool match = false;
 321         int i;
 322
 323         negotiated_eid[0] = 0;
 324         read_lock(&smc_clc_eid_table.lock);
 325         if (peer_eid && local_eid &&
 326             smc_clc_eid_table.seid_enabled &&
 327             smc_v2_ext->hdr.flag.seid &&
 328             !memcmp(peer_eid, local_eid, SMC_MAX_EID_LEN)) {
 329                 memcpy(negotiated_eid, peer_eid, SMC_MAX_EID_LEN);
 330                 match = true;
 331                 goto out;
 332         }
 333
 334         for (i = 0; i < smc_v2_ext->hdr.eid_cnt; i++) {
 335                 if (_smc_clc_match_ueid(smc_v2_ext->user_eids[i])) {
 336                         memcpy(negotiated_eid, smc_v2_ext->user_eids[i],
 337                                SMC_MAX_EID_LEN);
 338                         match = true;
 339                         goto out;
 340                 }
 341         }
 342 out:
 343         read_unlock(&smc_clc_eid_table.lock);
 344         return match;
 345 }
 346
 347 /* check arriving CLC proposal */
 348 static bool smc_clc_msg_prop_valid(struct smc_clc_msg_proposal *pclc)
 349 {
 350         struct smc_clc_msg_proposal_prefix *pclc_prfx;
 351         struct smc_clc_smcd_v2_extension *smcd_v2_ext;
 352         struct smc_clc_msg_hdr *hdr = &pclc->hdr;
 353         struct smc_clc_v2_extension *v2_ext;
 354
 355         v2_ext = smc_get_clc_v2_ext(pclc);
 356         pclc_prfx = smc_clc_proposal_get_prefix(pclc);
 357         if (hdr->version == SMC_V1) {
 358                 if (hdr->typev1 == SMC_TYPE_N)
 359                         return false;
 360                 if (ntohs(hdr->length) !=
 361                         sizeof(*pclc) + ntohs(pclc->iparea_offset) +
 362                         sizeof(*pclc_prfx) +
 363                         pclc_prfx->ipv6_prefixes_cnt *
 364                                 sizeof(struct smc_clc_ipv6_prefix) +
 365                         sizeof(struct smc_clc_msg_trail))
 366                         return false;
 367         } else {
 368                 if (ntohs(hdr->length) !=
 369                         sizeof(*pclc) +
 370                         sizeof(struct smc_clc_msg_smcd) +
 371                         (hdr->typev1 != SMC_TYPE_N ?
 372                                 sizeof(*pclc_prfx) +
 373                                 pclc_prfx->ipv6_prefixes_cnt *
 374                                 sizeof(struct smc_clc_ipv6_prefix) : 0) +
 375                         (hdr->typev2 != SMC_TYPE_N ?
 376                                 sizeof(*v2_ext) +
 377                                 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN : 0) +
 378                         (smcd_indicated(hdr->typev2) ?
 379                                 sizeof(*smcd_v2_ext) + v2_ext->hdr.ism_gid_cnt *
 380                                         sizeof(struct smc_clc_smcd_gid_chid) :
 381                                 0) +
 382                         sizeof(struct smc_clc_msg_trail))
 383                         return false;
 384         }
 385         return true;
 386 }
 387
 388 /* check arriving CLC accept or confirm */
 389 static bool
 390 smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm *clc)
 391 {
 392         struct smc_clc_msg_hdr *hdr = &clc->hdr;
 393
 394         if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
 395                 return false;
 396         if (hdr->version == SMC_V1) {
 397                 if ((hdr->typev1 == SMC_TYPE_R &&
 398                      ntohs(hdr->length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) ||
 399                     (hdr->typev1 == SMC_TYPE_D &&
 400                      ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN))
 401                         return false;
 402         } else {
 403                 if (hdr->typev1 == SMC_TYPE_D &&
 404                     ntohs(hdr->length) < SMCD_CLC_ACCEPT_CONFIRM_LEN_V2)
 405                         return false;
 406                 if (hdr->typev1 == SMC_TYPE_R &&
 407                     ntohs(hdr->length) < SMCR_CLC_ACCEPT_CONFIRM_LEN_V2)
 408                         return false;
 409         }
 410         return true;
 411 }
 412
 413 /* check arriving CLC decline */
 414 static bool
 415 smc_clc_msg_decl_valid(struct smc_clc_msg_decline *dclc)
 416 {
 417         struct smc_clc_msg_hdr *hdr = &dclc->hdr;
 418
 419         if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
 420                 return false;
 421         if (hdr->version == SMC_V1) {
 422                 if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline))
 423                         return false;
 424         } else {
 425                 if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline_v2))
 426                         return false;
 427         }
 428         return true;
 429 }
 430
 431 static int smc_clc_fill_fce_v2x(struct smc_clc_first_contact_ext_v2x *fce_v2x,
 432                                 struct smc_init_info *ini)
 433 {
 434         int ret = sizeof(*fce_v2x);
 435
 436         memset(fce_v2x, 0, sizeof(*fce_v2x));
 437         fce_v2x->fce_v2_base.os_type = SMC_CLC_OS_LINUX;
 438         fce_v2x->fce_v2_base.release = ini->release_nr;
 439         memcpy(fce_v2x->fce_v2_base.hostname,
 440                smc_hostname, sizeof(smc_hostname));
 441         if (ini->is_smcd && ini->release_nr < SMC_RELEASE_1) {
 442                 ret = sizeof(struct smc_clc_first_contact_ext);
 443                 goto out;
 444         }
 445
 446         if (ini->release_nr >= SMC_RELEASE_1) {
 447                 if (!ini->is_smcd) {
 448                         fce_v2x->max_conns = ini->max_conns;
 449                         fce_v2x->max_links = ini->max_links;
 450                 }
 451                 fce_v2x->feature_mask = htons(ini->feature_mask);
 452         }
 453
 454 out:
 455         return ret;
 456 }
 457
 458 /* check if received message has a correct header length and contains valid
 459  * heading and trailing eyecatchers
 460  */
 461 static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl)
 462 {
 463         struct smc_clc_msg_accept_confirm *clc;
 464         struct smc_clc_msg_proposal *pclc;
 465         struct smc_clc_msg_decline *dclc;
 466         struct smc_clc_msg_trail *trl;
 467
 468         if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
 469             memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
 470                 return false;
 471         switch (clcm->type) {
 472         case SMC_CLC_PROPOSAL:
 473                 pclc = (struct smc_clc_msg_proposal *)clcm;
 474                 if (!smc_clc_msg_prop_valid(pclc))
 475                         return false;
 476                 trl = (struct smc_clc_msg_trail *)
 477                         ((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl));
 478                 break;
 479         case SMC_CLC_ACCEPT:
 480         case SMC_CLC_CONFIRM:
 481                 clc = (struct smc_clc_msg_accept_confirm *)clcm;
 482                 if (!smc_clc_msg_acc_conf_valid(clc))
 483                         return false;
 484                 trl = (struct smc_clc_msg_trail *)
 485                         ((u8 *)clc + ntohs(clc->hdr.length) - sizeof(*trl));
 486                 break;
 487         case SMC_CLC_DECLINE:
 488                 dclc = (struct smc_clc_msg_decline *)clcm;
 489                 if (!smc_clc_msg_decl_valid(dclc))
 490                         return false;
 491                 check_trl = false;
 492                 break;
 493         default:
 494                 return false;
 495         }
 496         if (check_trl &&
 497             memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
 498             memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
 499                 return false;
 500         return true;
 501 }
 502
 503 /* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */
 504 static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4,
 505                                  struct smc_clc_msg_proposal_prefix *prop)
 506 {
 507         struct in_device *in_dev = __in_dev_get_rcu(dst->dev);
 508         const struct in_ifaddr *ifa;
 509
 510         if (!in_dev)
 511                 return -ENODEV;
 512
 513         in_dev_for_each_ifa_rcu(ifa, in_dev) {
 514                 if (!inet_ifa_match(ipv4, ifa))
 515                         continue;
 516                 prop->prefix_len = inet_mask_len(ifa->ifa_mask);
 517                 prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask;
 518                 /* prop->ipv6_prefixes_cnt = 0; already done by memset before */
 519                 return 0;
 520         }
 521         return -ENOENT;
 522 }
 523
 524 /* fill CLC proposal msg with ipv6 prefixes from device */
 525 static int smc_clc_prfx_set6_rcu(struct dst_entry *dst,
 526                                  struct smc_clc_msg_proposal_prefix *prop,
 527                                  struct smc_clc_ipv6_prefix *ipv6_prfx)
 528 {
 529 #if IS_ENABLED(CONFIG_IPV6)
 530         struct inet6_dev *in6_dev = __in6_dev_get(dst->dev);
 531         struct inet6_ifaddr *ifa;
 532         int cnt = 0;
 533
 534         if (!in6_dev)
 535                 return -ENODEV;
 536         /* use a maximum of 8 IPv6 prefixes from device */
 537         list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
 538                 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
 539                         continue;
 540                 ipv6_addr_prefix(&ipv6_prfx[cnt].prefix,
 541                                  &ifa->addr, ifa->prefix_len);
 542                 ipv6_prfx[cnt].prefix_len = ifa->prefix_len;
 543                 cnt++;
 544                 if (cnt == SMC_CLC_MAX_V6_PREFIX)
 545                         break;
 546         }
 547         prop->ipv6_prefixes_cnt = cnt;
 548         if (cnt)
 549                 return 0;
 550 #endif
 551         return -ENOENT;
 552 }
 553
 554 /* retrieve and set prefixes in CLC proposal msg */
 555 static int smc_clc_prfx_set(struct socket *clcsock,
 556                             struct smc_clc_msg_proposal_prefix *prop,
 557                             struct smc_clc_ipv6_prefix *ipv6_prfx)
 558 {
 559         struct dst_entry *dst = sk_dst_get(clcsock->sk);
 560         struct sockaddr_storage addrs;
 561         struct sockaddr_in6 *addr6;
 562         struct sockaddr_in *addr;
 563         int rc = -ENOENT;
 564
 565         if (!dst) {
 566                 rc = -ENOTCONN;
 567                 goto out;
 568         }
 569         if (!dst->dev) {
 570                 rc = -ENODEV;
 571                 goto out_rel;
 572         }
 573         /* get address to which the internal TCP socket is bound */
 574         if (kernel_getsockname(clcsock, (struct sockaddr *)&addrs) < 0)
 575                 goto out_rel;
 576         /* analyze IP specific data of net_device belonging to TCP socket */
 577         addr6 = (struct sockaddr_in6 *)&addrs;
 578         rcu_read_lock();
 579         if (addrs.ss_family == PF_INET) {
 580                 /* IPv4 */
 581                 addr = (struct sockaddr_in *)&addrs;
 582                 rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop);
 583         } else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) {
 584                 /* mapped IPv4 address - peer is IPv4 only */
 585                 rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3],
 586                                            prop);
 587         } else {
 588                 /* IPv6 */
 589                 rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx);
 590         }
 591         rcu_read_unlock();
 592 out_rel:
 593         dst_release(dst);
 594 out:
 595         return rc;
 596 }
 597
 598 /* match ipv4 addrs of dev against addr in CLC proposal */
 599 static int smc_clc_prfx_match4_rcu(struct net_device *dev,
 600                                    struct smc_clc_msg_proposal_prefix *prop)
 601 {
 602         struct in_device *in_dev = __in_dev_get_rcu(dev);
 603         const struct in_ifaddr *ifa;
 604
 605         if (!in_dev)
 606                 return -ENODEV;
 607         in_dev_for_each_ifa_rcu(ifa, in_dev) {
 608                 if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) &&
 609                     inet_ifa_match(prop->outgoing_subnet, ifa))
 610                         return 0;
 611         }
 612
 613         return -ENOENT;
 614 }
 615
 616 /* match ipv6 addrs of dev against addrs in CLC proposal */
 617 static int smc_clc_prfx_match6_rcu(struct net_device *dev,
 618                                    struct smc_clc_msg_proposal_prefix *prop)
 619 {
 620 #if IS_ENABLED(CONFIG_IPV6)
 621         struct inet6_dev *in6_dev = __in6_dev_get(dev);
 622         struct smc_clc_ipv6_prefix *ipv6_prfx;
 623         struct inet6_ifaddr *ifa;
 624         int i, max;
 625
 626         if (!in6_dev)
 627                 return -ENODEV;
 628         /* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */
 629         ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop));
 630         max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX);
 631         list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
 632                 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
 633                         continue;
 634                 for (i = 0; i < max; i++) {
 635                         if (ifa->prefix_len == ipv6_prfx[i].prefix_len &&
 636                             ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix,
 637                                               ifa->prefix_len))
 638                                 return 0;
 639                 }
 640         }
 641 #endif
 642         return -ENOENT;
 643 }
 644
 645 /* check if proposed prefixes match one of our device prefixes */
 646 int smc_clc_prfx_match(struct socket *clcsock,
 647                        struct smc_clc_msg_proposal_prefix *prop)
 648 {
 649         struct dst_entry *dst = sk_dst_get(clcsock->sk);
 650         int rc;
 651
 652         if (!dst) {
 653                 rc = -ENOTCONN;
 654                 goto out;
 655         }
 656         if (!dst->dev) {
 657                 rc = -ENODEV;
 658                 goto out_rel;
 659         }
 660         rcu_read_lock();
 661         if (!prop->ipv6_prefixes_cnt)
 662                 rc = smc_clc_prfx_match4_rcu(dst->dev, prop);
 663         else
 664                 rc = smc_clc_prfx_match6_rcu(dst->dev, prop);
 665         rcu_read_unlock();
 666 out_rel:
 667         dst_release(dst);
 668 out:
 669         return rc;
 670 }
 671
 672 /* Wait for data on the tcp-socket, analyze received data
 673  * Returns:
 674  * 0 if success and it was not a decline that we received.
 675  * SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send.
 676  * clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise.
 677  */
 678 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
 679                      u8 expected_type, unsigned long timeout)
 680 {
 681         long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo;
 682         struct sock *clc_sk = smc->clcsock->sk;
 683         struct smc_clc_msg_hdr *clcm = buf;
 684         struct msghdr msg = {NULL, 0};
 685         int reason_code = 0;
 686         struct kvec vec = {buf, buflen};
 687         int len, datlen, recvlen;
 688         bool check_trl = true;
 689         int krflags;
 690
 691         /* peek the first few bytes to determine length of data to receive
 692          * so we don't consume any subsequent CLC message or payload data
 693          * in the TCP byte stream
 694          */
 695         /*
 696          * Caller must make sure that buflen is no less than
 697          * sizeof(struct smc_clc_msg_hdr)
 698          */
 699         krflags = MSG_PEEK | MSG_WAITALL;
 700         clc_sk->sk_rcvtimeo = timeout;
 701         iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1,
 702                         sizeof(struct smc_clc_msg_hdr));
 703         len = sock_recvmsg(smc->clcsock, &msg, krflags);
 704         if (signal_pending(current)) {
 705                 reason_code = -EINTR;
 706                 clc_sk->sk_err = EINTR;
 707                 smc->sk.sk_err = EINTR;
 708                 goto out;
 709         }
 710         if (clc_sk->sk_err) {
 711                 reason_code = -clc_sk->sk_err;
 712                 if (clc_sk->sk_err == EAGAIN &&
 713                     expected_type == SMC_CLC_DECLINE)
 714                         clc_sk->sk_err = 0; /* reset for fallback usage */
 715                 else
 716                         smc->sk.sk_err = clc_sk->sk_err;
 717                 goto out;
 718         }
 719         if (!len) { /* peer has performed orderly shutdown */
 720                 smc->sk.sk_err = ECONNRESET;
 721                 reason_code = -ECONNRESET;
 722                 goto out;
 723         }
 724         if (len < 0) {
 725                 if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE)
 726                         smc->sk.sk_err = -len;
 727                 reason_code = len;
 728                 goto out;
 729         }
 730         datlen = ntohs(clcm->length);
 731         if ((len < sizeof(struct smc_clc_msg_hdr)) ||
 732             (clcm->version < SMC_V1) ||
 733             ((clcm->type != SMC_CLC_DECLINE) &&
 734              (clcm->type != expected_type))) {
 735                 smc->sk.sk_err = EPROTO;
 736                 reason_code = -EPROTO;
 737                 goto out;
 738         }
 739
 740         /* receive the complete CLC message */
 741         memset(&msg, 0, sizeof(struct msghdr));
 742         if (datlen > buflen) {
 743                 check_trl = false;
 744                 recvlen = buflen;
 745         } else {
 746                 recvlen = datlen;
 747         }
 748         iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
 749         krflags = MSG_WAITALL;
 750         len = sock_recvmsg(smc->clcsock, &msg, krflags);
 751         if (len < recvlen || !smc_clc_msg_hdr_valid(clcm, check_trl)) {
 752                 smc->sk.sk_err = EPROTO;
 753                 reason_code = -EPROTO;
 754                 goto out;
 755         }
 756         datlen -= len;
 757         while (datlen) {
 758                 u8 tmp[SMC_CLC_RECV_BUF_LEN];
 759
 760                 vec.iov_base = &tmp;
 761                 vec.iov_len = SMC_CLC_RECV_BUF_LEN;
 762                 /* receive remaining proposal message */
 763                 recvlen = datlen > SMC_CLC_RECV_BUF_LEN ?
 764                                                 SMC_CLC_RECV_BUF_LEN : datlen;
 765                 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
 766                 len = sock_recvmsg(smc->clcsock, &msg, krflags);
 767                 datlen -= len;
 768         }
 769         if (clcm->type == SMC_CLC_DECLINE) {
 770                 struct smc_clc_msg_decline *dclc;
 771
 772                 dclc = (struct smc_clc_msg_decline *)clcm;
 773                 reason_code = SMC_CLC_DECL_PEERDECL;
 774                 smc->peer_diagnosis = ntohl(dclc->peer_diagnosis);
 775                 if (((struct smc_clc_msg_decline *)buf)->hdr.typev2 &
 776                                                 SMC_FIRST_CONTACT_MASK) {
 777                         smc->conn.lgr->sync_err = 1;
 778                         smc_lgr_terminate_sched(smc->conn.lgr);
 779                 }
 780         }
 781
 782 out:
 783         clc_sk->sk_rcvtimeo = rcvtimeo;
 784         return reason_code;
 785 }
 786
 787 /* send CLC DECLINE message across internal TCP socket */
 788 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version)
 789 {
 790         struct smc_clc_msg_decline *dclc_v1;
 791         struct smc_clc_msg_decline_v2 dclc;
 792         struct msghdr msg;
 793         int len, send_len;
 794         struct kvec vec;
 795
 796         dclc_v1 = (struct smc_clc_msg_decline *)&dclc;
 797         memset(&dclc, 0, sizeof(dclc));
 798         memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
 799         dclc.hdr.type = SMC_CLC_DECLINE;
 800         dclc.hdr.version = version;
 801         dclc.os_type = version == SMC_V1 ? 0 : SMC_CLC_OS_LINUX;
 802         dclc.hdr.typev2 = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ?
 803                                                 SMC_FIRST_CONTACT_MASK : 0;
 804         if ((!smc_conn_lgr_valid(&smc->conn) || !smc->conn.lgr->is_smcd) &&
 805             smc_ib_is_valid_local_systemid())
 806                 memcpy(dclc.id_for_peer, local_systemid,
 807                        sizeof(local_systemid));
 808         dclc.peer_diagnosis = htonl(peer_diag_info);
 809         if (version == SMC_V1) {
 810                 memcpy(dclc_v1->trl.eyecatcher, SMC_EYECATCHER,
 811                        sizeof(SMC_EYECATCHER));
 812                 send_len = sizeof(*dclc_v1);
 813         } else {
 814                 memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER,
 815                        sizeof(SMC_EYECATCHER));
 816                 send_len = sizeof(dclc);
 817         }
 818         dclc.hdr.length = htons(send_len);
 819
 820         memset(&msg, 0, sizeof(msg));
 821         vec.iov_base = &dclc;
 822         vec.iov_len = send_len;
 823         len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, send_len);
 824         if (len < 0 || len < send_len)
 825                 len = -EPROTO;
 826         return len > 0 ? 0 : len;
 827 }
 828
 829 /* send CLC PROPOSAL message across internal TCP socket */
 830 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini)
 831 {
 832         struct smc_clc_smcd_v2_extension *smcd_v2_ext;
 833         struct smc_clc_msg_proposal_prefix *pclc_prfx;
 834         struct smc_clc_msg_proposal *pclc_base;
 835         struct smc_clc_smcd_gid_chid *gidchids;
 836         struct smc_clc_msg_proposal_area *pclc;
 837         struct smc_clc_ipv6_prefix *ipv6_prfx;
 838         struct net *net = sock_net(&smc->sk);
 839         struct smc_clc_v2_extension *v2_ext;
 840         struct smc_clc_msg_smcd *pclc_smcd;
 841         struct smc_clc_msg_trail *trl;
 842         struct smcd_dev *smcd;
 843         int len, i, plen, rc;
 844         int reason_code = 0;
 845         struct kvec vec[8];
 846         struct msghdr msg;
 847
 848         pclc = kzalloc(sizeof(*pclc), GFP_KERNEL);
 849         if (!pclc)
 850                 return -ENOMEM;
 851
 852         pclc_base = &pclc->pclc_base;
 853         pclc_smcd = &pclc->pclc_smcd;
 854         pclc_prfx = &pclc->pclc_prfx;
 855         ipv6_prfx = pclc->pclc_prfx_ipv6;
 856         v2_ext = &pclc->pclc_v2_ext;
 857         smcd_v2_ext = &pclc->pclc_smcd_v2_ext;
 858         gidchids = pclc->pclc_gidchids;
 859         trl = &pclc->pclc_trl;
 860
 861         pclc_base->hdr.version = SMC_V2;
 862         pclc_base->hdr.typev1 = ini->smc_type_v1;
 863         pclc_base->hdr.typev2 = ini->smc_type_v2;
 864         plen = sizeof(*pclc_base) + sizeof(*pclc_smcd) + sizeof(*trl);
 865
 866         /* retrieve ip prefixes for CLC proposal msg */
 867         if (ini->smc_type_v1 != SMC_TYPE_N) {
 868                 rc = smc_clc_prfx_set(smc->clcsock, pclc_prfx, ipv6_prfx);
 869                 if (rc) {
 870                         if (ini->smc_type_v2 == SMC_TYPE_N) {
 871                                 kfree(pclc);
 872                                 return SMC_CLC_DECL_CNFERR;
 873                         }
 874                         pclc_base->hdr.typev1 = SMC_TYPE_N;
 875                 } else {
 876                         pclc_base->iparea_offset = htons(sizeof(*pclc_smcd));
 877                         plen += sizeof(*pclc_prfx) +
 878                                         pclc_prfx->ipv6_prefixes_cnt *
 879                                         sizeof(ipv6_prfx[0]);
 880                 }
 881         }
 882
 883         /* build SMC Proposal CLC message */
 884         memcpy(pclc_base->hdr.eyecatcher, SMC_EYECATCHER,
 885                sizeof(SMC_EYECATCHER));
 886         pclc_base->hdr.type = SMC_CLC_PROPOSAL;
 887         if (smcr_indicated(ini->smc_type_v1)) {
 888                 /* add SMC-R specifics */
 889                 memcpy(pclc_base->lcl.id_for_peer, local_systemid,
 890                        sizeof(local_systemid));
 891                 memcpy(pclc_base->lcl.gid, ini->ib_gid, SMC_GID_SIZE);
 892                 memcpy(pclc_base->lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1],
 893                        ETH_ALEN);
 894         }
 895         if (smcd_indicated(ini->smc_type_v1)) {
 896                 struct smcd_gid smcd_gid;
 897
 898                 /* add SMC-D specifics */
 899                 if (ini->ism_dev[0]) {
 900                         smcd = ini->ism_dev[0];
 901                         smcd->ops->get_local_gid(smcd, &smcd_gid);
 902                         pclc_smcd->ism.gid = htonll(smcd_gid.gid);
 903                         pclc_smcd->ism.chid =
 904                                 htons(smc_ism_get_chid(ini->ism_dev[0]));
 905                 }
 906         }
 907         if (ini->smc_type_v2 == SMC_TYPE_N) {
 908                 pclc_smcd->v2_ext_offset = 0;
 909         } else {
 910                 struct smc_clc_eid_entry *ueident;
 911                 u16 v2_ext_offset;
 912
 913                 v2_ext->hdr.flag.release = SMC_RELEASE;
 914                 v2_ext_offset = sizeof(*pclc_smcd) -
 915                         offsetofend(struct smc_clc_msg_smcd, v2_ext_offset);
 916                 if (ini->smc_type_v1 != SMC_TYPE_N)
 917                         v2_ext_offset += sizeof(*pclc_prfx) +
 918                                                 pclc_prfx->ipv6_prefixes_cnt *
 919                                                 sizeof(ipv6_prfx[0]);
 920                 pclc_smcd->v2_ext_offset = htons(v2_ext_offset);
 921                 plen += sizeof(*v2_ext);
 922
 923                 v2_ext->feature_mask = htons(SMC_FEATURE_MASK);
 924                 read_lock(&smc_clc_eid_table.lock);
 925                 v2_ext->hdr.eid_cnt = smc_clc_eid_table.ueid_cnt;
 926                 plen += smc_clc_eid_table.ueid_cnt * SMC_MAX_EID_LEN;
 927                 i = 0;
 928                 list_for_each_entry(ueident, &smc_clc_eid_table.list, list) {
 929                         memcpy(v2_ext->user_eids[i++], ueident->eid,
 930                                sizeof(ueident->eid));
 931                 }
 932                 read_unlock(&smc_clc_eid_table.lock);
 933         }
 934         if (smcd_indicated(ini->smc_type_v2)) {
 935                 struct smcd_gid smcd_gid;
 936                 u8 *eid = NULL;
 937                 int entry = 0;
 938
 939                 v2_ext->hdr.flag.seid = smc_clc_eid_table.seid_enabled;
 940                 v2_ext->hdr.smcd_v2_ext_offset = htons(sizeof(*v2_ext) -
 941                                 offsetofend(struct smc_clnt_opts_area_hdr,
 942                                             smcd_v2_ext_offset) +
 943                                 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);
 944                 smc_ism_get_system_eid(&eid);
 945                 if (eid && v2_ext->hdr.flag.seid)
 946                         memcpy(smcd_v2_ext->system_eid, eid, SMC_MAX_EID_LEN);
 947                 plen += sizeof(*smcd_v2_ext);
 948                 if (ini->ism_offered_cnt) {
 949                         for (i = 1; i <= ini->ism_offered_cnt; i++) {
 950                                 smcd = ini->ism_dev[i];
 951                                 smcd->ops->get_local_gid(smcd, &smcd_gid);
 952                                 gidchids[entry].chid =
 953                                         htons(smc_ism_get_chid(ini->ism_dev[i]));
 954                                 gidchids[entry].gid = htonll(smcd_gid.gid);
 955                                 if (smc_ism_is_virtual(smcd)) {
 956                                         /* a virtual ISM device takes two
 957                                          * entries. CHID of the second entry
 958                                          * repeats that of the first entry.
 959                                          */
 960                                         gidchids[entry + 1].chid =
 961                                                 gidchids[entry].chid;
 962                                         gidchids[entry + 1].gid =
 963                                                 htonll(smcd_gid.gid_ext);
 964                                         entry++;
 965                                 }
 966                                 entry++;
 967                         }
 968                         plen += entry * sizeof(struct smc_clc_smcd_gid_chid);
 969                 }
 970                 v2_ext->hdr.ism_gid_cnt = entry;
 971         }
 972         if (smcr_indicated(ini->smc_type_v2)) {
 973                 memcpy(v2_ext->roce, ini->smcrv2.ib_gid_v2, SMC_GID_SIZE);
 974                 v2_ext->max_conns = net->smc.sysctl_max_conns_per_lgr;
 975                 v2_ext->max_links = net->smc.sysctl_max_links_per_lgr;
 976         }
 977
 978         pclc_base->hdr.length = htons(plen);
 979         memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
 980
 981         /* send SMC Proposal CLC message */
 982         memset(&msg, 0, sizeof(msg));
 983         i = 0;
 984         vec[i].iov_base = pclc_base;
 985         vec[i++].iov_len = sizeof(*pclc_base);
 986         vec[i].iov_base = pclc_smcd;
 987         vec[i++].iov_len = sizeof(*pclc_smcd);
 988         if (ini->smc_type_v1 != SMC_TYPE_N) {
 989                 vec[i].iov_base = pclc_prfx;
 990                 vec[i++].iov_len = sizeof(*pclc_prfx);
 991                 if (pclc_prfx->ipv6_prefixes_cnt > 0) {
 992                         vec[i].iov_base = ipv6_prfx;
 993                         vec[i++].iov_len = pclc_prfx->ipv6_prefixes_cnt *
 994                                            sizeof(ipv6_prfx[0]);
 995                 }
 996         }
 997         if (ini->smc_type_v2 != SMC_TYPE_N) {
 998                 vec[i].iov_base = v2_ext;
 999                 vec[i++].iov_len = sizeof(*v2_ext) +
1000                                    (v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);
1001                 if (smcd_indicated(ini->smc_type_v2)) {
1002                         vec[i].iov_base = smcd_v2_ext;
1003                         vec[i++].iov_len = sizeof(*smcd_v2_ext);
1004                         if (ini->ism_offered_cnt) {
1005                                 vec[i].iov_base = gidchids;
1006                                 vec[i++].iov_len = v2_ext->hdr.ism_gid_cnt *
1007                                         sizeof(struct smc_clc_smcd_gid_chid);
1008                         }
1009                 }
1010         }
1011         vec[i].iov_base = trl;
1012         vec[i++].iov_len = sizeof(*trl);
1013         /* due to the few bytes needed for clc-handshake this cannot block */
1014         len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen);
1015         if (len < 0) {
1016                 smc->sk.sk_err = smc->clcsock->sk->sk_err;
1017                 reason_code = -smc->sk.sk_err;
1018         } else if (len < ntohs(pclc_base->hdr.length)) {
1019                 reason_code = -ENETUNREACH;
1020                 smc->sk.sk_err = -reason_code;
1021         }
1022
1023         kfree(pclc);
1024         return reason_code;
1025 }
1026
1027 static void
1028 smcd_clc_prep_confirm_accept(struct smc_connection *conn,
1029                              struct smc_clc_msg_accept_confirm *clc,
1030                              int first_contact, u8 version,
1031                              u8 *eid, struct smc_init_info *ini,
1032                              int *fce_len,
1033                              struct smc_clc_first_contact_ext_v2x *fce_v2x,
1034                              struct smc_clc_msg_trail *trl)
1035 {
1036         struct smcd_dev *smcd = conn->lgr->smcd;
1037         struct smcd_gid smcd_gid;
1038         u16 chid;
1039         int len;
1040
1041         /* SMC-D specific settings */
1042         memcpy(clc->hdr.eyecatcher, SMCD_EYECATCHER,
1043                sizeof(SMCD_EYECATCHER));
1044         smcd->ops->get_local_gid(smcd, &smcd_gid);
1045         clc->hdr.typev1 = SMC_TYPE_D;
1046         clc->d0.gid = htonll(smcd_gid.gid);
1047         clc->d0.token = htonll(conn->rmb_desc->token);
1048         clc->d0.dmbe_size = conn->rmbe_size_comp;
1049         clc->d0.dmbe_idx = 0;
1050         memcpy(&clc->d0.linkid, conn->lgr->id, SMC_LGR_ID_SIZE);
1051         if (version == SMC_V1) {
1052                 clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
1053         } else {
1054                 chid = smc_ism_get_chid(smcd);
1055                 clc->d1.chid = htons(chid);
1056                 if (eid && eid[0])
1057                         memcpy(clc->d1.eid, eid, SMC_MAX_EID_LEN);
1058                 if (__smc_ism_is_virtual(chid))
1059                         clc->d1.gid_ext = htonll(smcd_gid.gid_ext);
1060                 len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2;
1061                 if (first_contact) {
1062                         *fce_len = smc_clc_fill_fce_v2x(fce_v2x, ini);
1063                         len += *fce_len;
1064                 }
1065                 clc->hdr.length = htons(len);
1066         }
1067         memcpy(trl->eyecatcher, SMCD_EYECATCHER,
1068                sizeof(SMCD_EYECATCHER));
1069 }
1070
1071 static void
1072 smcr_clc_prep_confirm_accept(struct smc_connection *conn,
1073                              struct smc_clc_msg_accept_confirm *clc,
1074                              int first_contact, u8 version,
1075                              u8 *eid, struct smc_init_info *ini,
1076                              int *fce_len,
1077                              struct smc_clc_first_contact_ext_v2x *fce_v2x,
1078                              struct smc_clc_fce_gid_ext *gle,
1079                              struct smc_clc_msg_trail *trl)
1080 {
1081         struct smc_link *link = conn->lnk;
1082         int len;
1083
1084         /* SMC-R specific settings */
1085         memcpy(clc->hdr.eyecatcher, SMC_EYECATCHER,
1086                sizeof(SMC_EYECATCHER));
1087         clc->hdr.typev1 = SMC_TYPE_R;
1088         memcpy(clc->r0.lcl.id_for_peer, local_systemid,
1089                sizeof(local_systemid));
1090         memcpy(&clc->r0.lcl.gid, link->gid, SMC_GID_SIZE);
1091         memcpy(&clc->r0.lcl.mac, &link->smcibdev->mac[link->ibport - 1],
1092                ETH_ALEN);
1093         hton24(clc->r0.qpn, link->roce_qp->qp_num);
1094         clc->r0.rmb_rkey =
1095                 htonl(conn->rmb_desc->mr[link->link_idx]->rkey);
1096         clc->r0.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */
1097         clc->r0.rmbe_alert_token = htonl(conn->alert_token_local);
1098         switch (clc->hdr.type) {
1099         case SMC_CLC_ACCEPT:
1100                 clc->r0.qp_mtu = link->path_mtu;
1101                 break;
1102         case SMC_CLC_CONFIRM:
1103                 clc->r0.qp_mtu = min(link->path_mtu, link->peer_mtu);
1104                 break;
1105         }
1106         clc->r0.rmbe_size = conn->rmbe_size_comp;
1107         clc->r0.rmb_dma_addr = conn->rmb_desc->is_vm ?
1108                 cpu_to_be64((uintptr_t)conn->rmb_desc->cpu_addr) :
1109                 cpu_to_be64((u64)sg_dma_address
1110                             (conn->rmb_desc->sgt[link->link_idx].sgl));
1111         hton24(clc->r0.psn, link->psn_initial);
1112         if (version == SMC_V1) {
1113                 clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
1114         } else {
1115                 if (eid && eid[0])
1116                         memcpy(clc->r1.eid, eid, SMC_MAX_EID_LEN);
1117                 len = SMCR_CLC_ACCEPT_CONFIRM_LEN_V2;
1118                 if (first_contact) {
1119                         *fce_len = smc_clc_fill_fce_v2x(fce_v2x, ini);
1120                         len += *fce_len;
1121                         fce_v2x->fce_v2_base.v2_direct =
1122                                 !link->lgr->uses_gateway;
1123                         if (clc->hdr.type == SMC_CLC_CONFIRM) {
1124                                 memset(gle, 0, sizeof(*gle));
1125                                 gle->gid_cnt = ini->smcrv2.gidlist.len;
1126                                 len += sizeof(*gle);
1127                                 len += gle->gid_cnt * sizeof(gle->gid[0]);
1128                         }
1129                 }
1130                 clc->hdr.length = htons(len);
1131         }
1132         memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
1133 }
1134
1135 /* build and send CLC CONFIRM / ACCEPT message */
1136 static int smc_clc_send_confirm_accept(struct smc_sock *smc,
1137                                        struct smc_clc_msg_accept_confirm *clc,
1138                                        int first_contact, u8 version,
1139                                        u8 *eid, struct smc_init_info *ini)
1140 {
1141         struct smc_clc_first_contact_ext_v2x fce_v2x;
1142         struct smc_connection *conn = &smc->conn;
1143         struct smc_clc_fce_gid_ext gle;
1144         struct smc_clc_msg_trail trl;
1145         int i, fce_len;
1146         struct kvec vec[5];
1147         struct msghdr msg;
1148
1149         /* send SMC Confirm CLC msg */
1150         clc->hdr.version = version;     /* SMC version */
1151         if (first_contact)
1152                 clc->hdr.typev2 |= SMC_FIRST_CONTACT_MASK;
1153         if (conn->lgr->is_smcd)
1154                 smcd_clc_prep_confirm_accept(conn, clc, first_contact,
1155                                              version, eid, ini, &fce_len,
1156                                              &fce_v2x, &trl);
1157         else
1158                 smcr_clc_prep_confirm_accept(conn, clc, first_contact,
1159                                              version, eid, ini, &fce_len,
1160                                              &fce_v2x, &gle, &trl);
1161         memset(&msg, 0, sizeof(msg));
1162         i = 0;
1163         vec[i].iov_base = clc;
1164         if (version > SMC_V1)
1165                 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ?
1166                                         SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 :
1167                                         SMCR_CLC_ACCEPT_CONFIRM_LEN_V2) -
1168                                    sizeof(trl);
1169         else
1170                 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ?
1171                                                 SMCD_CLC_ACCEPT_CONFIRM_LEN :
1172                                                 SMCR_CLC_ACCEPT_CONFIRM_LEN) -
1173                                    sizeof(trl);
1174         if (version > SMC_V1 && first_contact) {
1175                 vec[i].iov_base = &fce_v2x;
1176                 vec[i++].iov_len = fce_len;
1177                 if (!conn->lgr->is_smcd) {
1178                         if (clc->hdr.type == SMC_CLC_CONFIRM) {
1179                                 vec[i].iov_base = &gle;
1180                                 vec[i++].iov_len = sizeof(gle);
1181                                 vec[i].iov_base = &ini->smcrv2.gidlist.list;
1182                                 vec[i++].iov_len = gle.gid_cnt *
1183                                                    sizeof(gle.gid[0]);
1184                         }
1185                 }
1186         }
1187         vec[i].iov_base = &trl;
1188         vec[i++].iov_len = sizeof(trl);
1189         return kernel_sendmsg(smc->clcsock, &msg, vec, 1,
1190                               ntohs(clc->hdr.length));
1191 }
1192
1193 /* send CLC CONFIRM message across internal TCP socket */
1194 int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
1195                          u8 version, u8 *eid, struct smc_init_info *ini)
1196 {
1197         struct smc_clc_msg_accept_confirm cclc;
1198         int reason_code = 0;
1199         int len;
1200
1201         /* send SMC Confirm CLC msg */
1202         memset(&cclc, 0, sizeof(cclc));
1203         cclc.hdr.type = SMC_CLC_CONFIRM;
1204         len = smc_clc_send_confirm_accept(smc, &cclc, clnt_first_contact,
1205                                           version, eid, ini);
1206         if (len < ntohs(cclc.hdr.length)) {
1207                 if (len >= 0) {
1208                         reason_code = -ENETUNREACH;
1209                         smc->sk.sk_err = -reason_code;
1210                 } else {
1211                         smc->sk.sk_err = smc->clcsock->sk->sk_err;
1212                         reason_code = -smc->sk.sk_err;
1213                 }
1214         }
1215         return reason_code;
1216 }
1217
1218 /* send CLC ACCEPT message across internal TCP socket */
1219 int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact,
1220                         u8 version, u8 *negotiated_eid, struct smc_init_info *ini)
1221 {
1222         struct smc_clc_msg_accept_confirm aclc;
1223         int len;
1224
1225         memset(&aclc, 0, sizeof(aclc));
1226         aclc.hdr.type = SMC_CLC_ACCEPT;
1227         len = smc_clc_send_confirm_accept(new_smc, &aclc, srv_first_contact,
1228                                           version, negotiated_eid, ini);
1229         if (len < ntohs(aclc.hdr.length))
1230                 len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err;
1231
1232         return len > 0 ? 0 : len;
1233 }
1234
1235 int smc_clc_srv_v2x_features_validate(struct smc_sock *smc,
1236                                       struct smc_clc_msg_proposal *pclc,
1237                                       struct smc_init_info *ini)
1238 {
1239         struct smc_clc_v2_extension *pclc_v2_ext;
1240         struct net *net = sock_net(&smc->sk);
1241
1242         ini->max_conns = SMC_CONN_PER_LGR_MAX;
1243         ini->max_links = SMC_LINKS_ADD_LNK_MAX;
1244         ini->feature_mask = SMC_FEATURE_MASK;
1245
1246         if ((!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) ||
1247             ini->release_nr < SMC_RELEASE_1)
1248                 return 0;
1249
1250         pclc_v2_ext = smc_get_clc_v2_ext(pclc);
1251         if (!pclc_v2_ext)
1252                 return SMC_CLC_DECL_NOV2EXT;
1253
1254         if (ini->smcr_version & SMC_V2) {
1255                 ini->max_conns = min_t(u8, pclc_v2_ext->max_conns,
1256                                        net->smc.sysctl_max_conns_per_lgr);
1257                 if (ini->max_conns < SMC_CONN_PER_LGR_MIN)
1258                         return SMC_CLC_DECL_MAXCONNERR;
1259
1260                 ini->max_links = min_t(u8, pclc_v2_ext->max_links,
1261                                        net->smc.sysctl_max_links_per_lgr);
1262                 if (ini->max_links < SMC_LINKS_ADD_LNK_MIN)
1263                         return SMC_CLC_DECL_MAXLINKERR;
1264         }
1265
1266         return 0;
1267 }
1268
1269 int smc_clc_clnt_v2x_features_validate(struct smc_clc_first_contact_ext *fce,
1270                                        struct smc_init_info *ini)
1271 {
1272         struct smc_clc_first_contact_ext_v2x *fce_v2x =
1273                 (struct smc_clc_first_contact_ext_v2x *)fce;
1274
1275         if (ini->release_nr < SMC_RELEASE_1)
1276                 return 0;
1277
1278         if (!ini->is_smcd) {
1279                 if (fce_v2x->max_conns < SMC_CONN_PER_LGR_MIN)
1280                         return SMC_CLC_DECL_MAXCONNERR;
1281                 ini->max_conns = fce_v2x->max_conns;
1282
1283                 if (fce_v2x->max_links > SMC_LINKS_ADD_LNK_MAX ||
1284                     fce_v2x->max_links < SMC_LINKS_ADD_LNK_MIN)
1285                         return SMC_CLC_DECL_MAXLINKERR;
1286                 ini->max_links = fce_v2x->max_links;
1287         }
1288         /* common supplemental features of server and client */
1289         ini->feature_mask = ntohs(fce_v2x->feature_mask) & SMC_FEATURE_MASK;
1290
1291         return 0;
1292 }
1293
1294 int smc_clc_v2x_features_confirm_check(struct smc_clc_msg_accept_confirm *cclc,
1295                                        struct smc_init_info *ini)
1296 {
1297         struct smc_clc_first_contact_ext *fce =
1298                 smc_get_clc_first_contact_ext(cclc, ini->is_smcd);
1299         struct smc_clc_first_contact_ext_v2x *fce_v2x =
1300                 (struct smc_clc_first_contact_ext_v2x *)fce;
1301
1302         if (cclc->hdr.version == SMC_V1 ||
1303             !(cclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
1304                 return 0;
1305
1306         if (ini->release_nr != fce->release)
1307                 return SMC_CLC_DECL_RELEASEERR;
1308
1309         if (fce->release < SMC_RELEASE_1)
1310                 return 0;
1311
1312         if (!ini->is_smcd) {
1313                 if (fce_v2x->max_conns != ini->max_conns)
1314                         return SMC_CLC_DECL_MAXCONNERR;
1315                 if (fce_v2x->max_links != ini->max_links)
1316                         return SMC_CLC_DECL_MAXLINKERR;
1317         }
1318         /* common supplemental features returned by client */
1319         ini->feature_mask = ntohs(fce_v2x->feature_mask);
1320
1321         return 0;
1322 }
1323
1324 void smc_clc_get_hostname(u8 **host)
1325 {
1326         *host = &smc_hostname[0];
1327 }
1328
1329 void __init smc_clc_init(void)
1330 {
1331         struct new_utsname *u;
1332
1333         memset(smc_hostname, _S, sizeof(smc_hostname)); /* ASCII blanks */
1334         u = utsname();
1335         memcpy(smc_hostname, u->nodename,
1336                min_t(size_t, strlen(u->nodename), sizeof(smc_hostname)));
1337
1338         INIT_LIST_HEAD(&smc_clc_eid_table.list);
1339         rwlock_init(&smc_clc_eid_table.lock);
1340         smc_clc_eid_table.ueid_cnt = 0;
1341 #if IS_ENABLED(CONFIG_S390)
1342         smc_clc_eid_table.seid_enabled = 1;
1343 #else
1344         smc_clc_eid_table.seid_enabled = 0;
1345 #endif
1346 }
1347
1348 void smc_clc_exit(void)
1349 {
1350         smc_clc_ueid_remove(NULL);
1351 }