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