1 // SPDX-License-Identifier: GPL-2.0
3 * Shared Memory Communications over RDMA (SMC-R) and RoCE
5 * CLC (connection layer control) handshake over initial TCP socket to
6 * prepare for RDMA traffic
8 * Copyright IBM Corp. 2016, 2018
10 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
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>
20 #include <net/addrconf.h>
29 #include "smc_netlink.h"
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
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'};
42 static u8 smc_hostname[SMC_MAX_HOSTNAME_LEN];
44 struct smc_clc_eid_table {
46 struct list_head list;
51 static struct smc_clc_eid_table smc_clc_eid_table;
53 struct smc_clc_eid_entry {
54 struct list_head list;
55 u8 eid[SMC_MAX_EID_LEN];
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.
63 static bool smc_clc_ueid_valid(char *ueid)
65 char *end = ueid + SMC_MAX_EID_LEN;
67 while (--end >= ueid && isspace(*end))
71 if (!isalnum(*ueid) || islower(*ueid))
74 if ((!isalnum(*ueid) || islower(*ueid)) && *ueid != '.' &&
82 static int smc_clc_ueid_add(char *ueid)
84 struct smc_clc_eid_entry *new_ueid, *tmp_ueid;
87 if (!smc_clc_ueid_valid(ueid))
90 /* add a new ueid entry to the ueid table if there isn't one */
91 new_ueid = kzalloc(sizeof(*new_ueid), GFP_KERNEL);
94 memcpy(new_ueid->eid, ueid, SMC_MAX_EID_LEN);
96 write_lock(&smc_clc_eid_table.lock);
97 if (smc_clc_eid_table.ueid_cnt >= SMC_MAX_UEID) {
101 list_for_each_entry(tmp_ueid, &smc_clc_eid_table.list, list) {
102 if (!memcmp(tmp_ueid->eid, ueid, SMC_MAX_EID_LEN)) {
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);
113 write_unlock(&smc_clc_eid_table.lock);
118 int smc_clc_ueid_count(void)
122 read_lock(&smc_clc_eid_table.lock);
123 count = smc_clc_eid_table.ueid_cnt;
124 read_unlock(&smc_clc_eid_table.lock);
129 int smc_nl_add_ueid(struct sk_buff *skb, struct genl_info *info)
131 struct nlattr *nla_ueid = info->attrs[SMC_NLA_EID_TABLE_ENTRY];
134 if (!nla_ueid || nla_len(nla_ueid) != SMC_MAX_EID_LEN + 1)
136 ueid = (char *)nla_data(nla_ueid);
138 return smc_clc_ueid_add(ueid);
141 /* remove one or all ueid entries from the table */
142 static int smc_clc_ueid_remove(char *ueid)
144 struct smc_clc_eid_entry *lst_ueid, *tmp_ueid;
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,
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--;
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 */
164 write_unlock(&smc_clc_eid_table.lock);
168 int smc_nl_remove_ueid(struct sk_buff *skb, struct genl_info *info)
170 struct nlattr *nla_ueid = info->attrs[SMC_NLA_EID_TABLE_ENTRY];
173 if (!nla_ueid || nla_len(nla_ueid) != SMC_MAX_EID_LEN + 1)
175 ueid = (char *)nla_data(nla_ueid);
177 return smc_clc_ueid_remove(ueid);
180 int smc_nl_flush_ueid(struct sk_buff *skb, struct genl_info *info)
182 smc_clc_ueid_remove(NULL);
186 static int smc_nl_ueid_dumpinfo(struct sk_buff *skb, u32 portid, u32 seq,
187 u32 flags, char *ueid)
189 char ueid_str[SMC_MAX_EID_LEN + 1];
192 hdr = genlmsg_put(skb, portid, seq, &smc_gen_nl_family,
193 flags, SMC_NETLINK_DUMP_UEID);
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);
202 genlmsg_end(skb, hdr);
206 static int _smc_nl_ueid_dump(struct sk_buff *skb, u32 portid, u32 seq,
209 struct smc_clc_eid_entry *lst_ueid;
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)
216 if (smc_nl_ueid_dumpinfo(skb, portid, seq, NLM_F_MULTI,
222 read_unlock(&smc_clc_eid_table.lock);
226 int smc_nl_dump_ueid(struct sk_buff *skb, struct netlink_callback *cb)
228 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
231 idx = _smc_nl_ueid_dump(skb, NETLINK_CB(cb->skb).portid,
232 cb->nlh->nlmsg_seq, cb_ctx->pos[0]);
234 cb_ctx->pos[0] = idx;
238 int smc_nl_dump_seid(struct sk_buff *skb, struct netlink_callback *cb)
240 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
241 char seid_str[SMC_MAX_EID_LEN + 1];
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);
254 if (!smc_ism_is_v2_capable())
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))
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))
268 genlmsg_end(skb, hdr);
272 genlmsg_cancel(skb, hdr);
276 int smc_nl_enable_seid(struct sk_buff *skb, struct genl_info *info)
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);
288 int smc_nl_disable_seid(struct sk_buff *skb, struct genl_info *info)
292 #if IS_ENABLED(CONFIG_S390)
293 write_lock(&smc_clc_eid_table.lock);
294 if (!smc_clc_eid_table.ueid_cnt)
297 smc_clc_eid_table.seid_enabled = 0;
298 write_unlock(&smc_clc_eid_table.lock);
305 static bool _smc_clc_match_ueid(u8 *peer_ueid)
307 struct smc_clc_eid_entry *tmp_ueid;
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))
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)
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);
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],
343 read_unlock(&smc_clc_eid_table.lock);
347 /* check arriving CLC proposal */
348 static bool smc_clc_msg_prop_valid(struct smc_clc_msg_proposal *pclc)
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;
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)
360 if (ntohs(hdr->length) !=
361 sizeof(*pclc) + ntohs(pclc->iparea_offset) +
363 pclc_prfx->ipv6_prefixes_cnt *
364 sizeof(struct smc_clc_ipv6_prefix) +
365 sizeof(struct smc_clc_msg_trail))
368 if (ntohs(hdr->length) !=
370 sizeof(struct smc_clc_msg_smcd) +
371 (hdr->typev1 != SMC_TYPE_N ?
373 pclc_prfx->ipv6_prefixes_cnt *
374 sizeof(struct smc_clc_ipv6_prefix) : 0) +
375 (hdr->typev2 != SMC_TYPE_N ?
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) :
382 sizeof(struct smc_clc_msg_trail))
388 /* check arriving CLC accept or confirm */
390 smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm_v2 *clc_v2)
392 struct smc_clc_msg_hdr *hdr = &clc_v2->hdr;
394 if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
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))
403 if (hdr->typev1 == SMC_TYPE_D &&
404 ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 &&
405 (ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 +
406 sizeof(struct smc_clc_first_contact_ext)))
408 if (hdr->typev1 == SMC_TYPE_R &&
409 ntohs(hdr->length) < SMCR_CLC_ACCEPT_CONFIRM_LEN_V2)
415 /* check arriving CLC decline */
417 smc_clc_msg_decl_valid(struct smc_clc_msg_decline *dclc)
419 struct smc_clc_msg_hdr *hdr = &dclc->hdr;
421 if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
423 if (hdr->version == SMC_V1) {
424 if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline))
427 if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline_v2))
433 static void smc_clc_fill_fce(struct smc_clc_first_contact_ext *fce, int *len)
435 memset(fce, 0, sizeof(*fce));
436 fce->os_type = SMC_CLC_OS_LINUX;
437 fce->release = SMC_RELEASE;
438 memcpy(fce->hostname, smc_hostname, sizeof(smc_hostname));
439 (*len) += sizeof(*fce);
442 /* check if received message has a correct header length and contains valid
443 * heading and trailing eyecatchers
445 static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl)
447 struct smc_clc_msg_accept_confirm_v2 *clc_v2;
448 struct smc_clc_msg_proposal *pclc;
449 struct smc_clc_msg_decline *dclc;
450 struct smc_clc_msg_trail *trl;
452 if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
453 memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
455 switch (clcm->type) {
456 case SMC_CLC_PROPOSAL:
457 pclc = (struct smc_clc_msg_proposal *)clcm;
458 if (!smc_clc_msg_prop_valid(pclc))
460 trl = (struct smc_clc_msg_trail *)
461 ((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl));
464 case SMC_CLC_CONFIRM:
465 clc_v2 = (struct smc_clc_msg_accept_confirm_v2 *)clcm;
466 if (!smc_clc_msg_acc_conf_valid(clc_v2))
468 trl = (struct smc_clc_msg_trail *)
469 ((u8 *)clc_v2 + ntohs(clc_v2->hdr.length) -
472 case SMC_CLC_DECLINE:
473 dclc = (struct smc_clc_msg_decline *)clcm;
474 if (!smc_clc_msg_decl_valid(dclc))
482 memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
483 memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
488 /* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */
489 static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4,
490 struct smc_clc_msg_proposal_prefix *prop)
492 struct in_device *in_dev = __in_dev_get_rcu(dst->dev);
493 const struct in_ifaddr *ifa;
498 in_dev_for_each_ifa_rcu(ifa, in_dev) {
499 if (!inet_ifa_match(ipv4, ifa))
501 prop->prefix_len = inet_mask_len(ifa->ifa_mask);
502 prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask;
503 /* prop->ipv6_prefixes_cnt = 0; already done by memset before */
509 /* fill CLC proposal msg with ipv6 prefixes from device */
510 static int smc_clc_prfx_set6_rcu(struct dst_entry *dst,
511 struct smc_clc_msg_proposal_prefix *prop,
512 struct smc_clc_ipv6_prefix *ipv6_prfx)
514 #if IS_ENABLED(CONFIG_IPV6)
515 struct inet6_dev *in6_dev = __in6_dev_get(dst->dev);
516 struct inet6_ifaddr *ifa;
521 /* use a maximum of 8 IPv6 prefixes from device */
522 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
523 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
525 ipv6_addr_prefix(&ipv6_prfx[cnt].prefix,
526 &ifa->addr, ifa->prefix_len);
527 ipv6_prfx[cnt].prefix_len = ifa->prefix_len;
529 if (cnt == SMC_CLC_MAX_V6_PREFIX)
532 prop->ipv6_prefixes_cnt = cnt;
539 /* retrieve and set prefixes in CLC proposal msg */
540 static int smc_clc_prfx_set(struct socket *clcsock,
541 struct smc_clc_msg_proposal_prefix *prop,
542 struct smc_clc_ipv6_prefix *ipv6_prfx)
544 struct dst_entry *dst = sk_dst_get(clcsock->sk);
545 struct sockaddr_storage addrs;
546 struct sockaddr_in6 *addr6;
547 struct sockaddr_in *addr;
558 /* get address to which the internal TCP socket is bound */
559 if (kernel_getsockname(clcsock, (struct sockaddr *)&addrs) < 0)
561 /* analyze IP specific data of net_device belonging to TCP socket */
562 addr6 = (struct sockaddr_in6 *)&addrs;
564 if (addrs.ss_family == PF_INET) {
566 addr = (struct sockaddr_in *)&addrs;
567 rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop);
568 } else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) {
569 /* mapped IPv4 address - peer is IPv4 only */
570 rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3],
574 rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx);
583 /* match ipv4 addrs of dev against addr in CLC proposal */
584 static int smc_clc_prfx_match4_rcu(struct net_device *dev,
585 struct smc_clc_msg_proposal_prefix *prop)
587 struct in_device *in_dev = __in_dev_get_rcu(dev);
588 const struct in_ifaddr *ifa;
592 in_dev_for_each_ifa_rcu(ifa, in_dev) {
593 if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) &&
594 inet_ifa_match(prop->outgoing_subnet, ifa))
601 /* match ipv6 addrs of dev against addrs in CLC proposal */
602 static int smc_clc_prfx_match6_rcu(struct net_device *dev,
603 struct smc_clc_msg_proposal_prefix *prop)
605 #if IS_ENABLED(CONFIG_IPV6)
606 struct inet6_dev *in6_dev = __in6_dev_get(dev);
607 struct smc_clc_ipv6_prefix *ipv6_prfx;
608 struct inet6_ifaddr *ifa;
613 /* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */
614 ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop));
615 max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX);
616 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
617 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
619 for (i = 0; i < max; i++) {
620 if (ifa->prefix_len == ipv6_prfx[i].prefix_len &&
621 ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix,
630 /* check if proposed prefixes match one of our device prefixes */
631 int smc_clc_prfx_match(struct socket *clcsock,
632 struct smc_clc_msg_proposal_prefix *prop)
634 struct dst_entry *dst = sk_dst_get(clcsock->sk);
646 if (!prop->ipv6_prefixes_cnt)
647 rc = smc_clc_prfx_match4_rcu(dst->dev, prop);
649 rc = smc_clc_prfx_match6_rcu(dst->dev, prop);
657 /* Wait for data on the tcp-socket, analyze received data
659 * 0 if success and it was not a decline that we received.
660 * SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send.
661 * clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise.
663 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
664 u8 expected_type, unsigned long timeout)
666 long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo;
667 struct sock *clc_sk = smc->clcsock->sk;
668 struct smc_clc_msg_hdr *clcm = buf;
669 struct msghdr msg = {NULL, 0};
671 struct kvec vec = {buf, buflen};
672 int len, datlen, recvlen;
673 bool check_trl = true;
676 /* peek the first few bytes to determine length of data to receive
677 * so we don't consume any subsequent CLC message or payload data
678 * in the TCP byte stream
681 * Caller must make sure that buflen is no less than
682 * sizeof(struct smc_clc_msg_hdr)
684 krflags = MSG_PEEK | MSG_WAITALL;
685 clc_sk->sk_rcvtimeo = timeout;
686 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1,
687 sizeof(struct smc_clc_msg_hdr));
688 len = sock_recvmsg(smc->clcsock, &msg, krflags);
689 if (signal_pending(current)) {
690 reason_code = -EINTR;
691 clc_sk->sk_err = EINTR;
692 smc->sk.sk_err = EINTR;
695 if (clc_sk->sk_err) {
696 reason_code = -clc_sk->sk_err;
697 if (clc_sk->sk_err == EAGAIN &&
698 expected_type == SMC_CLC_DECLINE)
699 clc_sk->sk_err = 0; /* reset for fallback usage */
701 smc->sk.sk_err = clc_sk->sk_err;
704 if (!len) { /* peer has performed orderly shutdown */
705 smc->sk.sk_err = ECONNRESET;
706 reason_code = -ECONNRESET;
710 if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE)
711 smc->sk.sk_err = -len;
715 datlen = ntohs(clcm->length);
716 if ((len < sizeof(struct smc_clc_msg_hdr)) ||
717 (clcm->version < SMC_V1) ||
718 ((clcm->type != SMC_CLC_DECLINE) &&
719 (clcm->type != expected_type))) {
720 smc->sk.sk_err = EPROTO;
721 reason_code = -EPROTO;
725 /* receive the complete CLC message */
726 memset(&msg, 0, sizeof(struct msghdr));
727 if (datlen > buflen) {
733 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
734 krflags = MSG_WAITALL;
735 len = sock_recvmsg(smc->clcsock, &msg, krflags);
736 if (len < recvlen || !smc_clc_msg_hdr_valid(clcm, check_trl)) {
737 smc->sk.sk_err = EPROTO;
738 reason_code = -EPROTO;
743 u8 tmp[SMC_CLC_RECV_BUF_LEN];
746 vec.iov_len = SMC_CLC_RECV_BUF_LEN;
747 /* receive remaining proposal message */
748 recvlen = datlen > SMC_CLC_RECV_BUF_LEN ?
749 SMC_CLC_RECV_BUF_LEN : datlen;
750 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
751 len = sock_recvmsg(smc->clcsock, &msg, krflags);
754 if (clcm->type == SMC_CLC_DECLINE) {
755 struct smc_clc_msg_decline *dclc;
757 dclc = (struct smc_clc_msg_decline *)clcm;
758 reason_code = SMC_CLC_DECL_PEERDECL;
759 smc->peer_diagnosis = ntohl(dclc->peer_diagnosis);
760 if (((struct smc_clc_msg_decline *)buf)->hdr.typev2 &
761 SMC_FIRST_CONTACT_MASK) {
762 smc->conn.lgr->sync_err = 1;
763 smc_lgr_terminate_sched(smc->conn.lgr);
768 clc_sk->sk_rcvtimeo = rcvtimeo;
772 /* send CLC DECLINE message across internal TCP socket */
773 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version)
775 struct smc_clc_msg_decline *dclc_v1;
776 struct smc_clc_msg_decline_v2 dclc;
781 dclc_v1 = (struct smc_clc_msg_decline *)&dclc;
782 memset(&dclc, 0, sizeof(dclc));
783 memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
784 dclc.hdr.type = SMC_CLC_DECLINE;
785 dclc.hdr.version = version;
786 dclc.os_type = version == SMC_V1 ? 0 : SMC_CLC_OS_LINUX;
787 dclc.hdr.typev2 = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ?
788 SMC_FIRST_CONTACT_MASK : 0;
789 if ((!smc_conn_lgr_valid(&smc->conn) || !smc->conn.lgr->is_smcd) &&
790 smc_ib_is_valid_local_systemid())
791 memcpy(dclc.id_for_peer, local_systemid,
792 sizeof(local_systemid));
793 dclc.peer_diagnosis = htonl(peer_diag_info);
794 if (version == SMC_V1) {
795 memcpy(dclc_v1->trl.eyecatcher, SMC_EYECATCHER,
796 sizeof(SMC_EYECATCHER));
797 send_len = sizeof(*dclc_v1);
799 memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER,
800 sizeof(SMC_EYECATCHER));
801 send_len = sizeof(dclc);
803 dclc.hdr.length = htons(send_len);
805 memset(&msg, 0, sizeof(msg));
806 vec.iov_base = &dclc;
807 vec.iov_len = send_len;
808 len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, send_len);
809 if (len < 0 || len < send_len)
811 return len > 0 ? 0 : len;
814 /* send CLC PROPOSAL message across internal TCP socket */
815 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini)
817 struct smc_clc_smcd_v2_extension *smcd_v2_ext;
818 struct smc_clc_msg_proposal_prefix *pclc_prfx;
819 struct smc_clc_msg_proposal *pclc_base;
820 struct smc_clc_smcd_gid_chid *gidchids;
821 struct smc_clc_msg_proposal_area *pclc;
822 struct smc_clc_ipv6_prefix *ipv6_prfx;
823 struct smc_clc_v2_extension *v2_ext;
824 struct smc_clc_msg_smcd *pclc_smcd;
825 struct smc_clc_msg_trail *trl;
826 int len, i, plen, rc;
831 pclc = kzalloc(sizeof(*pclc), GFP_KERNEL);
835 pclc_base = &pclc->pclc_base;
836 pclc_smcd = &pclc->pclc_smcd;
837 pclc_prfx = &pclc->pclc_prfx;
838 ipv6_prfx = pclc->pclc_prfx_ipv6;
839 v2_ext = &pclc->pclc_v2_ext;
840 smcd_v2_ext = &pclc->pclc_smcd_v2_ext;
841 gidchids = pclc->pclc_gidchids;
842 trl = &pclc->pclc_trl;
844 pclc_base->hdr.version = SMC_V2;
845 pclc_base->hdr.typev1 = ini->smc_type_v1;
846 pclc_base->hdr.typev2 = ini->smc_type_v2;
847 plen = sizeof(*pclc_base) + sizeof(*pclc_smcd) + sizeof(*trl);
849 /* retrieve ip prefixes for CLC proposal msg */
850 if (ini->smc_type_v1 != SMC_TYPE_N) {
851 rc = smc_clc_prfx_set(smc->clcsock, pclc_prfx, ipv6_prfx);
853 if (ini->smc_type_v2 == SMC_TYPE_N) {
855 return SMC_CLC_DECL_CNFERR;
857 pclc_base->hdr.typev1 = SMC_TYPE_N;
859 pclc_base->iparea_offset = htons(sizeof(*pclc_smcd));
860 plen += sizeof(*pclc_prfx) +
861 pclc_prfx->ipv6_prefixes_cnt *
862 sizeof(ipv6_prfx[0]);
866 /* build SMC Proposal CLC message */
867 memcpy(pclc_base->hdr.eyecatcher, SMC_EYECATCHER,
868 sizeof(SMC_EYECATCHER));
869 pclc_base->hdr.type = SMC_CLC_PROPOSAL;
870 if (smcr_indicated(ini->smc_type_v1)) {
871 /* add SMC-R specifics */
872 memcpy(pclc_base->lcl.id_for_peer, local_systemid,
873 sizeof(local_systemid));
874 memcpy(pclc_base->lcl.gid, ini->ib_gid, SMC_GID_SIZE);
875 memcpy(pclc_base->lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1],
878 if (smcd_indicated(ini->smc_type_v1)) {
879 /* add SMC-D specifics */
880 if (ini->ism_dev[0]) {
881 pclc_smcd->ism.gid = htonll(ini->ism_dev[0]->local_gid);
882 pclc_smcd->ism.chid =
883 htons(smc_ism_get_chid(ini->ism_dev[0]));
886 if (ini->smc_type_v2 == SMC_TYPE_N) {
887 pclc_smcd->v2_ext_offset = 0;
889 struct smc_clc_eid_entry *ueident;
892 v2_ext->hdr.flag.release = SMC_RELEASE;
893 v2_ext_offset = sizeof(*pclc_smcd) -
894 offsetofend(struct smc_clc_msg_smcd, v2_ext_offset);
895 if (ini->smc_type_v1 != SMC_TYPE_N)
896 v2_ext_offset += sizeof(*pclc_prfx) +
897 pclc_prfx->ipv6_prefixes_cnt *
898 sizeof(ipv6_prfx[0]);
899 pclc_smcd->v2_ext_offset = htons(v2_ext_offset);
900 plen += sizeof(*v2_ext);
902 read_lock(&smc_clc_eid_table.lock);
903 v2_ext->hdr.eid_cnt = smc_clc_eid_table.ueid_cnt;
904 plen += smc_clc_eid_table.ueid_cnt * SMC_MAX_EID_LEN;
906 list_for_each_entry(ueident, &smc_clc_eid_table.list, list) {
907 memcpy(v2_ext->user_eids[i++], ueident->eid,
908 sizeof(ueident->eid));
910 read_unlock(&smc_clc_eid_table.lock);
912 if (smcd_indicated(ini->smc_type_v2)) {
915 v2_ext->hdr.flag.seid = smc_clc_eid_table.seid_enabled;
916 v2_ext->hdr.ism_gid_cnt = ini->ism_offered_cnt;
917 v2_ext->hdr.smcd_v2_ext_offset = htons(sizeof(*v2_ext) -
918 offsetofend(struct smc_clnt_opts_area_hdr,
919 smcd_v2_ext_offset) +
920 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);
921 smc_ism_get_system_eid(&eid);
922 if (eid && v2_ext->hdr.flag.seid)
923 memcpy(smcd_v2_ext->system_eid, eid, SMC_MAX_EID_LEN);
924 plen += sizeof(*smcd_v2_ext);
925 if (ini->ism_offered_cnt) {
926 for (i = 1; i <= ini->ism_offered_cnt; i++) {
927 gidchids[i - 1].gid =
928 htonll(ini->ism_dev[i]->local_gid);
929 gidchids[i - 1].chid =
930 htons(smc_ism_get_chid(ini->ism_dev[i]));
932 plen += ini->ism_offered_cnt *
933 sizeof(struct smc_clc_smcd_gid_chid);
936 if (smcr_indicated(ini->smc_type_v2))
937 memcpy(v2_ext->roce, ini->smcrv2.ib_gid_v2, SMC_GID_SIZE);
939 pclc_base->hdr.length = htons(plen);
940 memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
942 /* send SMC Proposal CLC message */
943 memset(&msg, 0, sizeof(msg));
945 vec[i].iov_base = pclc_base;
946 vec[i++].iov_len = sizeof(*pclc_base);
947 vec[i].iov_base = pclc_smcd;
948 vec[i++].iov_len = sizeof(*pclc_smcd);
949 if (ini->smc_type_v1 != SMC_TYPE_N) {
950 vec[i].iov_base = pclc_prfx;
951 vec[i++].iov_len = sizeof(*pclc_prfx);
952 if (pclc_prfx->ipv6_prefixes_cnt > 0) {
953 vec[i].iov_base = ipv6_prfx;
954 vec[i++].iov_len = pclc_prfx->ipv6_prefixes_cnt *
955 sizeof(ipv6_prfx[0]);
958 if (ini->smc_type_v2 != SMC_TYPE_N) {
959 vec[i].iov_base = v2_ext;
960 vec[i++].iov_len = sizeof(*v2_ext) +
961 (v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);
962 if (smcd_indicated(ini->smc_type_v2)) {
963 vec[i].iov_base = smcd_v2_ext;
964 vec[i++].iov_len = sizeof(*smcd_v2_ext);
965 if (ini->ism_offered_cnt) {
966 vec[i].iov_base = gidchids;
967 vec[i++].iov_len = ini->ism_offered_cnt *
968 sizeof(struct smc_clc_smcd_gid_chid);
972 vec[i].iov_base = trl;
973 vec[i++].iov_len = sizeof(*trl);
974 /* due to the few bytes needed for clc-handshake this cannot block */
975 len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen);
977 smc->sk.sk_err = smc->clcsock->sk->sk_err;
978 reason_code = -smc->sk.sk_err;
979 } else if (len < ntohs(pclc_base->hdr.length)) {
980 reason_code = -ENETUNREACH;
981 smc->sk.sk_err = -reason_code;
988 /* build and send CLC CONFIRM / ACCEPT message */
989 static int smc_clc_send_confirm_accept(struct smc_sock *smc,
990 struct smc_clc_msg_accept_confirm_v2 *clc_v2,
991 int first_contact, u8 version,
992 u8 *eid, struct smc_init_info *ini)
994 struct smc_connection *conn = &smc->conn;
995 struct smc_clc_msg_accept_confirm *clc;
996 struct smc_clc_first_contact_ext fce;
997 struct smc_clc_fce_gid_ext gle;
998 struct smc_clc_msg_trail trl;
1003 /* send SMC Confirm CLC msg */
1004 clc = (struct smc_clc_msg_accept_confirm *)clc_v2;
1005 clc->hdr.version = version; /* SMC version */
1007 clc->hdr.typev2 |= SMC_FIRST_CONTACT_MASK;
1008 if (conn->lgr->is_smcd) {
1009 /* SMC-D specific settings */
1010 memcpy(clc->hdr.eyecatcher, SMCD_EYECATCHER,
1011 sizeof(SMCD_EYECATCHER));
1012 clc->hdr.typev1 = SMC_TYPE_D;
1013 clc->d0.gid = conn->lgr->smcd->local_gid;
1014 clc->d0.token = conn->rmb_desc->token;
1015 clc->d0.dmbe_size = conn->rmbe_size_comp;
1016 clc->d0.dmbe_idx = 0;
1017 memcpy(&clc->d0.linkid, conn->lgr->id, SMC_LGR_ID_SIZE);
1018 if (version == SMC_V1) {
1019 clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
1022 htons(smc_ism_get_chid(conn->lgr->smcd));
1024 memcpy(clc_v2->d1.eid, eid, SMC_MAX_EID_LEN);
1025 len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2;
1027 smc_clc_fill_fce(&fce, &len);
1028 clc_v2->hdr.length = htons(len);
1030 memcpy(trl.eyecatcher, SMCD_EYECATCHER,
1031 sizeof(SMCD_EYECATCHER));
1033 struct smc_link *link = conn->lnk;
1035 /* SMC-R specific settings */
1036 memcpy(clc->hdr.eyecatcher, SMC_EYECATCHER,
1037 sizeof(SMC_EYECATCHER));
1038 clc->hdr.typev1 = SMC_TYPE_R;
1039 clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
1040 memcpy(clc->r0.lcl.id_for_peer, local_systemid,
1041 sizeof(local_systemid));
1042 memcpy(&clc->r0.lcl.gid, link->gid, SMC_GID_SIZE);
1043 memcpy(&clc->r0.lcl.mac, &link->smcibdev->mac[link->ibport - 1],
1045 hton24(clc->r0.qpn, link->roce_qp->qp_num);
1047 htonl(conn->rmb_desc->mr[link->link_idx]->rkey);
1048 clc->r0.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */
1049 clc->r0.rmbe_alert_token = htonl(conn->alert_token_local);
1050 switch (clc->hdr.type) {
1051 case SMC_CLC_ACCEPT:
1052 clc->r0.qp_mtu = link->path_mtu;
1054 case SMC_CLC_CONFIRM:
1055 clc->r0.qp_mtu = min(link->path_mtu, link->peer_mtu);
1058 clc->r0.rmbe_size = conn->rmbe_size_comp;
1059 clc->r0.rmb_dma_addr = conn->rmb_desc->is_vm ?
1060 cpu_to_be64((uintptr_t)conn->rmb_desc->cpu_addr) :
1061 cpu_to_be64((u64)sg_dma_address
1062 (conn->rmb_desc->sgt[link->link_idx].sgl));
1063 hton24(clc->r0.psn, link->psn_initial);
1064 if (version == SMC_V1) {
1065 clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
1068 memcpy(clc_v2->r1.eid, eid, SMC_MAX_EID_LEN);
1069 len = SMCR_CLC_ACCEPT_CONFIRM_LEN_V2;
1070 if (first_contact) {
1071 smc_clc_fill_fce(&fce, &len);
1072 fce.v2_direct = !link->lgr->uses_gateway;
1073 memset(&gle, 0, sizeof(gle));
1074 if (ini && clc->hdr.type == SMC_CLC_CONFIRM) {
1075 gle.gid_cnt = ini->smcrv2.gidlist.len;
1077 len += gle.gid_cnt * sizeof(gle.gid[0]);
1079 len += sizeof(gle.reserved);
1082 clc_v2->hdr.length = htons(len);
1084 memcpy(trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
1087 memset(&msg, 0, sizeof(msg));
1089 vec[i].iov_base = clc_v2;
1090 if (version > SMC_V1)
1091 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ?
1092 SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 :
1093 SMCR_CLC_ACCEPT_CONFIRM_LEN_V2) -
1096 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ?
1097 SMCD_CLC_ACCEPT_CONFIRM_LEN :
1098 SMCR_CLC_ACCEPT_CONFIRM_LEN) -
1100 if (version > SMC_V1 && first_contact) {
1101 vec[i].iov_base = &fce;
1102 vec[i++].iov_len = sizeof(fce);
1103 if (!conn->lgr->is_smcd) {
1104 if (clc->hdr.type == SMC_CLC_CONFIRM) {
1105 vec[i].iov_base = &gle;
1106 vec[i++].iov_len = sizeof(gle);
1107 vec[i].iov_base = &ini->smcrv2.gidlist.list;
1108 vec[i++].iov_len = gle.gid_cnt *
1111 vec[i].iov_base = &gle.reserved;
1112 vec[i++].iov_len = sizeof(gle.reserved);
1116 vec[i].iov_base = &trl;
1117 vec[i++].iov_len = sizeof(trl);
1118 return kernel_sendmsg(smc->clcsock, &msg, vec, 1,
1119 ntohs(clc->hdr.length));
1122 /* send CLC CONFIRM message across internal TCP socket */
1123 int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
1124 u8 version, u8 *eid, struct smc_init_info *ini)
1126 struct smc_clc_msg_accept_confirm_v2 cclc_v2;
1127 int reason_code = 0;
1130 /* send SMC Confirm CLC msg */
1131 memset(&cclc_v2, 0, sizeof(cclc_v2));
1132 cclc_v2.hdr.type = SMC_CLC_CONFIRM;
1133 len = smc_clc_send_confirm_accept(smc, &cclc_v2, clnt_first_contact,
1135 if (len < ntohs(cclc_v2.hdr.length)) {
1137 reason_code = -ENETUNREACH;
1138 smc->sk.sk_err = -reason_code;
1140 smc->sk.sk_err = smc->clcsock->sk->sk_err;
1141 reason_code = -smc->sk.sk_err;
1147 /* send CLC ACCEPT message across internal TCP socket */
1148 int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact,
1149 u8 version, u8 *negotiated_eid)
1151 struct smc_clc_msg_accept_confirm_v2 aclc_v2;
1154 memset(&aclc_v2, 0, sizeof(aclc_v2));
1155 aclc_v2.hdr.type = SMC_CLC_ACCEPT;
1156 len = smc_clc_send_confirm_accept(new_smc, &aclc_v2, srv_first_contact,
1157 version, negotiated_eid, NULL);
1158 if (len < ntohs(aclc_v2.hdr.length))
1159 len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err;
1161 return len > 0 ? 0 : len;
1164 void smc_clc_get_hostname(u8 **host)
1166 *host = &smc_hostname[0];
1169 void __init smc_clc_init(void)
1171 struct new_utsname *u;
1173 memset(smc_hostname, _S, sizeof(smc_hostname)); /* ASCII blanks */
1175 memcpy(smc_hostname, u->nodename,
1176 min_t(size_t, strlen(u->nodename), sizeof(smc_hostname)));
1178 INIT_LIST_HEAD(&smc_clc_eid_table.list);
1179 rwlock_init(&smc_clc_eid_table.lock);
1180 smc_clc_eid_table.ueid_cnt = 0;
1181 #if IS_ENABLED(CONFIG_S390)
1182 smc_clc_eid_table.seid_enabled = 1;
1184 smc_clc_eid_table.seid_enabled = 0;
1188 void smc_clc_exit(void)
1190 smc_clc_ueid_remove(NULL);