summaryrefslogtreecommitdiffstats
path: root/net/smc/smc_clc.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/smc/smc_clc.c')
-rw-r--r--net/smc/smc_clc.c1177
1 files changed, 1177 insertions, 0 deletions
diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c
new file mode 100644
index 000000000..9b8999e2a
--- /dev/null
+++ b/net/smc/smc_clc.c
@@ -0,0 +1,1177 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Shared Memory Communications over RDMA (SMC-R) and RoCE
+ *
+ * CLC (connection layer control) handshake over initial TCP socket to
+ * prepare for RDMA traffic
+ *
+ * Copyright IBM Corp. 2016, 2018
+ *
+ * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
+ */
+
+#include <linux/in.h>
+#include <linux/inetdevice.h>
+#include <linux/if_ether.h>
+#include <linux/sched/signal.h>
+#include <linux/utsname.h>
+#include <linux/ctype.h>
+
+#include <net/addrconf.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+
+#include "smc.h"
+#include "smc_core.h"
+#include "smc_clc.h"
+#include "smc_ib.h"
+#include "smc_ism.h"
+#include "smc_netlink.h"
+
+#define SMCR_CLC_ACCEPT_CONFIRM_LEN 68
+#define SMCD_CLC_ACCEPT_CONFIRM_LEN 48
+#define SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 78
+#define SMCR_CLC_ACCEPT_CONFIRM_LEN_V2 108
+#define SMC_CLC_RECV_BUF_LEN 100
+
+/* eye catcher "SMCR" EBCDIC for CLC messages */
+static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'};
+/* eye catcher "SMCD" EBCDIC for CLC messages */
+static const char SMCD_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xc4'};
+
+static u8 smc_hostname[SMC_MAX_HOSTNAME_LEN];
+
+struct smc_clc_eid_table {
+ rwlock_t lock;
+ struct list_head list;
+ u8 ueid_cnt;
+ u8 seid_enabled;
+};
+
+static struct smc_clc_eid_table smc_clc_eid_table;
+
+struct smc_clc_eid_entry {
+ struct list_head list;
+ u8 eid[SMC_MAX_EID_LEN];
+};
+
+/* The size of a user EID is 32 characters.
+ * Valid characters should be (single-byte character set) A-Z, 0-9, '.' and '-'.
+ * Blanks should only be used to pad to the expected size.
+ * First character must be alphanumeric.
+ */
+static bool smc_clc_ueid_valid(char *ueid)
+{
+ char *end = ueid + SMC_MAX_EID_LEN;
+
+ while (--end >= ueid && isspace(*end))
+ ;
+ if (end < ueid)
+ return false;
+ if (!isalnum(*ueid) || islower(*ueid))
+ return false;
+ while (ueid <= end) {
+ if ((!isalnum(*ueid) || islower(*ueid)) && *ueid != '.' &&
+ *ueid != '-')
+ return false;
+ ueid++;
+ }
+ return true;
+}
+
+static int smc_clc_ueid_add(char *ueid)
+{
+ struct smc_clc_eid_entry *new_ueid, *tmp_ueid;
+ int rc;
+
+ if (!smc_clc_ueid_valid(ueid))
+ return -EINVAL;
+
+ /* add a new ueid entry to the ueid table if there isn't one */
+ new_ueid = kzalloc(sizeof(*new_ueid), GFP_KERNEL);
+ if (!new_ueid)
+ return -ENOMEM;
+ memcpy(new_ueid->eid, ueid, SMC_MAX_EID_LEN);
+
+ write_lock(&smc_clc_eid_table.lock);
+ if (smc_clc_eid_table.ueid_cnt >= SMC_MAX_UEID) {
+ rc = -ERANGE;
+ goto err_out;
+ }
+ list_for_each_entry(tmp_ueid, &smc_clc_eid_table.list, list) {
+ if (!memcmp(tmp_ueid->eid, ueid, SMC_MAX_EID_LEN)) {
+ rc = -EEXIST;
+ goto err_out;
+ }
+ }
+ list_add_tail(&new_ueid->list, &smc_clc_eid_table.list);
+ smc_clc_eid_table.ueid_cnt++;
+ write_unlock(&smc_clc_eid_table.lock);
+ return 0;
+
+err_out:
+ write_unlock(&smc_clc_eid_table.lock);
+ kfree(new_ueid);
+ return rc;
+}
+
+int smc_clc_ueid_count(void)
+{
+ int count;
+
+ read_lock(&smc_clc_eid_table.lock);
+ count = smc_clc_eid_table.ueid_cnt;
+ read_unlock(&smc_clc_eid_table.lock);
+
+ return count;
+}
+
+int smc_nl_add_ueid(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr *nla_ueid = info->attrs[SMC_NLA_EID_TABLE_ENTRY];
+ char *ueid;
+
+ if (!nla_ueid || nla_len(nla_ueid) != SMC_MAX_EID_LEN + 1)
+ return -EINVAL;
+ ueid = (char *)nla_data(nla_ueid);
+
+ return smc_clc_ueid_add(ueid);
+}
+
+/* remove one or all ueid entries from the table */
+static int smc_clc_ueid_remove(char *ueid)
+{
+ struct smc_clc_eid_entry *lst_ueid, *tmp_ueid;
+ int rc = -ENOENT;
+
+ /* remove table entry */
+ write_lock(&smc_clc_eid_table.lock);
+ list_for_each_entry_safe(lst_ueid, tmp_ueid, &smc_clc_eid_table.list,
+ list) {
+ if (!ueid || !memcmp(lst_ueid->eid, ueid, SMC_MAX_EID_LEN)) {
+ list_del(&lst_ueid->list);
+ smc_clc_eid_table.ueid_cnt--;
+ kfree(lst_ueid);
+ rc = 0;
+ }
+ }
+ if (!rc && !smc_clc_eid_table.ueid_cnt) {
+ smc_clc_eid_table.seid_enabled = 1;
+ rc = -EAGAIN; /* indicate success and enabling of seid */
+ }
+ write_unlock(&smc_clc_eid_table.lock);
+ return rc;
+}
+
+int smc_nl_remove_ueid(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr *nla_ueid = info->attrs[SMC_NLA_EID_TABLE_ENTRY];
+ char *ueid;
+
+ if (!nla_ueid || nla_len(nla_ueid) != SMC_MAX_EID_LEN + 1)
+ return -EINVAL;
+ ueid = (char *)nla_data(nla_ueid);
+
+ return smc_clc_ueid_remove(ueid);
+}
+
+int smc_nl_flush_ueid(struct sk_buff *skb, struct genl_info *info)
+{
+ smc_clc_ueid_remove(NULL);
+ return 0;
+}
+
+static int smc_nl_ueid_dumpinfo(struct sk_buff *skb, u32 portid, u32 seq,
+ u32 flags, char *ueid)
+{
+ char ueid_str[SMC_MAX_EID_LEN + 1];
+ void *hdr;
+
+ hdr = genlmsg_put(skb, portid, seq, &smc_gen_nl_family,
+ flags, SMC_NETLINK_DUMP_UEID);
+ if (!hdr)
+ return -ENOMEM;
+ memcpy(ueid_str, ueid, SMC_MAX_EID_LEN);
+ ueid_str[SMC_MAX_EID_LEN] = 0;
+ if (nla_put_string(skb, SMC_NLA_EID_TABLE_ENTRY, ueid_str)) {
+ genlmsg_cancel(skb, hdr);
+ return -EMSGSIZE;
+ }
+ genlmsg_end(skb, hdr);
+ return 0;
+}
+
+static int _smc_nl_ueid_dump(struct sk_buff *skb, u32 portid, u32 seq,
+ int start_idx)
+{
+ struct smc_clc_eid_entry *lst_ueid;
+ int idx = 0;
+
+ read_lock(&smc_clc_eid_table.lock);
+ list_for_each_entry(lst_ueid, &smc_clc_eid_table.list, list) {
+ if (idx++ < start_idx)
+ continue;
+ if (smc_nl_ueid_dumpinfo(skb, portid, seq, NLM_F_MULTI,
+ lst_ueid->eid)) {
+ --idx;
+ break;
+ }
+ }
+ read_unlock(&smc_clc_eid_table.lock);
+ return idx;
+}
+
+int smc_nl_dump_ueid(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
+ int idx;
+
+ idx = _smc_nl_ueid_dump(skb, NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, cb_ctx->pos[0]);
+
+ cb_ctx->pos[0] = idx;
+ return skb->len;
+}
+
+int smc_nl_dump_seid(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
+ char seid_str[SMC_MAX_EID_LEN + 1];
+ u8 seid_enabled;
+ void *hdr;
+ u8 *seid;
+
+ if (cb_ctx->pos[0])
+ return skb->len;
+
+ hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
+ &smc_gen_nl_family, NLM_F_MULTI,
+ SMC_NETLINK_DUMP_SEID);
+ if (!hdr)
+ return -ENOMEM;
+ if (!smc_ism_is_v2_capable())
+ goto end;
+
+ smc_ism_get_system_eid(&seid);
+ memcpy(seid_str, seid, SMC_MAX_EID_LEN);
+ seid_str[SMC_MAX_EID_LEN] = 0;
+ if (nla_put_string(skb, SMC_NLA_SEID_ENTRY, seid_str))
+ goto err;
+ read_lock(&smc_clc_eid_table.lock);
+ seid_enabled = smc_clc_eid_table.seid_enabled;
+ read_unlock(&smc_clc_eid_table.lock);
+ if (nla_put_u8(skb, SMC_NLA_SEID_ENABLED, seid_enabled))
+ goto err;
+end:
+ genlmsg_end(skb, hdr);
+ cb_ctx->pos[0]++;
+ return skb->len;
+err:
+ genlmsg_cancel(skb, hdr);
+ return -EMSGSIZE;
+}
+
+int smc_nl_enable_seid(struct sk_buff *skb, struct genl_info *info)
+{
+ write_lock(&smc_clc_eid_table.lock);
+ smc_clc_eid_table.seid_enabled = 1;
+ write_unlock(&smc_clc_eid_table.lock);
+ return 0;
+}
+
+int smc_nl_disable_seid(struct sk_buff *skb, struct genl_info *info)
+{
+ int rc = 0;
+
+ write_lock(&smc_clc_eid_table.lock);
+ if (!smc_clc_eid_table.ueid_cnt)
+ rc = -ENOENT;
+ else
+ smc_clc_eid_table.seid_enabled = 0;
+ write_unlock(&smc_clc_eid_table.lock);
+ return rc;
+}
+
+static bool _smc_clc_match_ueid(u8 *peer_ueid)
+{
+ struct smc_clc_eid_entry *tmp_ueid;
+
+ list_for_each_entry(tmp_ueid, &smc_clc_eid_table.list, list) {
+ if (!memcmp(tmp_ueid->eid, peer_ueid, SMC_MAX_EID_LEN))
+ return true;
+ }
+ return false;
+}
+
+bool smc_clc_match_eid(u8 *negotiated_eid,
+ struct smc_clc_v2_extension *smc_v2_ext,
+ u8 *peer_eid, u8 *local_eid)
+{
+ bool match = false;
+ int i;
+
+ negotiated_eid[0] = 0;
+ read_lock(&smc_clc_eid_table.lock);
+ if (peer_eid && local_eid &&
+ smc_clc_eid_table.seid_enabled &&
+ smc_v2_ext->hdr.flag.seid &&
+ !memcmp(peer_eid, local_eid, SMC_MAX_EID_LEN)) {
+ memcpy(negotiated_eid, peer_eid, SMC_MAX_EID_LEN);
+ match = true;
+ goto out;
+ }
+
+ for (i = 0; i < smc_v2_ext->hdr.eid_cnt; i++) {
+ if (_smc_clc_match_ueid(smc_v2_ext->user_eids[i])) {
+ memcpy(negotiated_eid, smc_v2_ext->user_eids[i],
+ SMC_MAX_EID_LEN);
+ match = true;
+ goto out;
+ }
+ }
+out:
+ read_unlock(&smc_clc_eid_table.lock);
+ return match;
+}
+
+/* check arriving CLC proposal */
+static bool smc_clc_msg_prop_valid(struct smc_clc_msg_proposal *pclc)
+{
+ struct smc_clc_msg_proposal_prefix *pclc_prfx;
+ struct smc_clc_smcd_v2_extension *smcd_v2_ext;
+ struct smc_clc_msg_hdr *hdr = &pclc->hdr;
+ struct smc_clc_v2_extension *v2_ext;
+
+ v2_ext = smc_get_clc_v2_ext(pclc);
+ pclc_prfx = smc_clc_proposal_get_prefix(pclc);
+ if (hdr->version == SMC_V1) {
+ if (hdr->typev1 == SMC_TYPE_N)
+ return false;
+ if (ntohs(hdr->length) !=
+ sizeof(*pclc) + ntohs(pclc->iparea_offset) +
+ sizeof(*pclc_prfx) +
+ pclc_prfx->ipv6_prefixes_cnt *
+ sizeof(struct smc_clc_ipv6_prefix) +
+ sizeof(struct smc_clc_msg_trail))
+ return false;
+ } else {
+ if (ntohs(hdr->length) !=
+ sizeof(*pclc) +
+ sizeof(struct smc_clc_msg_smcd) +
+ (hdr->typev1 != SMC_TYPE_N ?
+ sizeof(*pclc_prfx) +
+ pclc_prfx->ipv6_prefixes_cnt *
+ sizeof(struct smc_clc_ipv6_prefix) : 0) +
+ (hdr->typev2 != SMC_TYPE_N ?
+ sizeof(*v2_ext) +
+ v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN : 0) +
+ (smcd_indicated(hdr->typev2) ?
+ sizeof(*smcd_v2_ext) + v2_ext->hdr.ism_gid_cnt *
+ sizeof(struct smc_clc_smcd_gid_chid) :
+ 0) +
+ sizeof(struct smc_clc_msg_trail))
+ return false;
+ }
+ return true;
+}
+
+/* check arriving CLC accept or confirm */
+static bool
+smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm_v2 *clc_v2)
+{
+ struct smc_clc_msg_hdr *hdr = &clc_v2->hdr;
+
+ if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
+ return false;
+ if (hdr->version == SMC_V1) {
+ if ((hdr->typev1 == SMC_TYPE_R &&
+ ntohs(hdr->length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) ||
+ (hdr->typev1 == SMC_TYPE_D &&
+ ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN))
+ return false;
+ } else {
+ if (hdr->typev1 == SMC_TYPE_D &&
+ ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 &&
+ (ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 +
+ sizeof(struct smc_clc_first_contact_ext)))
+ return false;
+ if (hdr->typev1 == SMC_TYPE_R &&
+ ntohs(hdr->length) < SMCR_CLC_ACCEPT_CONFIRM_LEN_V2)
+ return false;
+ }
+ return true;
+}
+
+/* check arriving CLC decline */
+static bool
+smc_clc_msg_decl_valid(struct smc_clc_msg_decline *dclc)
+{
+ struct smc_clc_msg_hdr *hdr = &dclc->hdr;
+
+ if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
+ return false;
+ if (hdr->version == SMC_V1) {
+ if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline))
+ return false;
+ } else {
+ if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline_v2))
+ return false;
+ }
+ return true;
+}
+
+static void smc_clc_fill_fce(struct smc_clc_first_contact_ext *fce, int *len)
+{
+ memset(fce, 0, sizeof(*fce));
+ fce->os_type = SMC_CLC_OS_LINUX;
+ fce->release = SMC_RELEASE;
+ memcpy(fce->hostname, smc_hostname, sizeof(smc_hostname));
+ (*len) += sizeof(*fce);
+}
+
+/* check if received message has a correct header length and contains valid
+ * heading and trailing eyecatchers
+ */
+static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl)
+{
+ struct smc_clc_msg_accept_confirm_v2 *clc_v2;
+ struct smc_clc_msg_proposal *pclc;
+ struct smc_clc_msg_decline *dclc;
+ struct smc_clc_msg_trail *trl;
+
+ if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
+ memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
+ return false;
+ switch (clcm->type) {
+ case SMC_CLC_PROPOSAL:
+ pclc = (struct smc_clc_msg_proposal *)clcm;
+ if (!smc_clc_msg_prop_valid(pclc))
+ return false;
+ trl = (struct smc_clc_msg_trail *)
+ ((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl));
+ break;
+ case SMC_CLC_ACCEPT:
+ case SMC_CLC_CONFIRM:
+ clc_v2 = (struct smc_clc_msg_accept_confirm_v2 *)clcm;
+ if (!smc_clc_msg_acc_conf_valid(clc_v2))
+ return false;
+ trl = (struct smc_clc_msg_trail *)
+ ((u8 *)clc_v2 + ntohs(clc_v2->hdr.length) -
+ sizeof(*trl));
+ break;
+ case SMC_CLC_DECLINE:
+ dclc = (struct smc_clc_msg_decline *)clcm;
+ if (!smc_clc_msg_decl_valid(dclc))
+ return false;
+ check_trl = false;
+ break;
+ default:
+ return false;
+ }
+ if (check_trl &&
+ memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
+ memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
+ return false;
+ return true;
+}
+
+/* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */
+static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4,
+ struct smc_clc_msg_proposal_prefix *prop)
+{
+ struct in_device *in_dev = __in_dev_get_rcu(dst->dev);
+ const struct in_ifaddr *ifa;
+
+ if (!in_dev)
+ return -ENODEV;
+
+ in_dev_for_each_ifa_rcu(ifa, in_dev) {
+ if (!inet_ifa_match(ipv4, ifa))
+ continue;
+ prop->prefix_len = inet_mask_len(ifa->ifa_mask);
+ prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask;
+ /* prop->ipv6_prefixes_cnt = 0; already done by memset before */
+ return 0;
+ }
+ return -ENOENT;
+}
+
+/* fill CLC proposal msg with ipv6 prefixes from device */
+static int smc_clc_prfx_set6_rcu(struct dst_entry *dst,
+ struct smc_clc_msg_proposal_prefix *prop,
+ struct smc_clc_ipv6_prefix *ipv6_prfx)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+ struct inet6_dev *in6_dev = __in6_dev_get(dst->dev);
+ struct inet6_ifaddr *ifa;
+ int cnt = 0;
+
+ if (!in6_dev)
+ return -ENODEV;
+ /* use a maximum of 8 IPv6 prefixes from device */
+ list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
+ if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
+ continue;
+ ipv6_addr_prefix(&ipv6_prfx[cnt].prefix,
+ &ifa->addr, ifa->prefix_len);
+ ipv6_prfx[cnt].prefix_len = ifa->prefix_len;
+ cnt++;
+ if (cnt == SMC_CLC_MAX_V6_PREFIX)
+ break;
+ }
+ prop->ipv6_prefixes_cnt = cnt;
+ if (cnt)
+ return 0;
+#endif
+ return -ENOENT;
+}
+
+/* retrieve and set prefixes in CLC proposal msg */
+static int smc_clc_prfx_set(struct socket *clcsock,
+ struct smc_clc_msg_proposal_prefix *prop,
+ struct smc_clc_ipv6_prefix *ipv6_prfx)
+{
+ struct dst_entry *dst = sk_dst_get(clcsock->sk);
+ struct sockaddr_storage addrs;
+ struct sockaddr_in6 *addr6;
+ struct sockaddr_in *addr;
+ int rc = -ENOENT;
+
+ if (!dst) {
+ rc = -ENOTCONN;
+ goto out;
+ }
+ if (!dst->dev) {
+ rc = -ENODEV;
+ goto out_rel;
+ }
+ /* get address to which the internal TCP socket is bound */
+ if (kernel_getsockname(clcsock, (struct sockaddr *)&addrs) < 0)
+ goto out_rel;
+ /* analyze IP specific data of net_device belonging to TCP socket */
+ addr6 = (struct sockaddr_in6 *)&addrs;
+ rcu_read_lock();
+ if (addrs.ss_family == PF_INET) {
+ /* IPv4 */
+ addr = (struct sockaddr_in *)&addrs;
+ rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop);
+ } else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) {
+ /* mapped IPv4 address - peer is IPv4 only */
+ rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3],
+ prop);
+ } else {
+ /* IPv6 */
+ rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx);
+ }
+ rcu_read_unlock();
+out_rel:
+ dst_release(dst);
+out:
+ return rc;
+}
+
+/* match ipv4 addrs of dev against addr in CLC proposal */
+static int smc_clc_prfx_match4_rcu(struct net_device *dev,
+ struct smc_clc_msg_proposal_prefix *prop)
+{
+ struct in_device *in_dev = __in_dev_get_rcu(dev);
+ const struct in_ifaddr *ifa;
+
+ if (!in_dev)
+ return -ENODEV;
+ in_dev_for_each_ifa_rcu(ifa, in_dev) {
+ if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) &&
+ inet_ifa_match(prop->outgoing_subnet, ifa))
+ return 0;
+ }
+
+ return -ENOENT;
+}
+
+/* match ipv6 addrs of dev against addrs in CLC proposal */
+static int smc_clc_prfx_match6_rcu(struct net_device *dev,
+ struct smc_clc_msg_proposal_prefix *prop)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+ struct inet6_dev *in6_dev = __in6_dev_get(dev);
+ struct smc_clc_ipv6_prefix *ipv6_prfx;
+ struct inet6_ifaddr *ifa;
+ int i, max;
+
+ if (!in6_dev)
+ return -ENODEV;
+ /* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */
+ ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop));
+ max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX);
+ list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
+ if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
+ continue;
+ for (i = 0; i < max; i++) {
+ if (ifa->prefix_len == ipv6_prfx[i].prefix_len &&
+ ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix,
+ ifa->prefix_len))
+ return 0;
+ }
+ }
+#endif
+ return -ENOENT;
+}
+
+/* check if proposed prefixes match one of our device prefixes */
+int smc_clc_prfx_match(struct socket *clcsock,
+ struct smc_clc_msg_proposal_prefix *prop)
+{
+ struct dst_entry *dst = sk_dst_get(clcsock->sk);
+ int rc;
+
+ if (!dst) {
+ rc = -ENOTCONN;
+ goto out;
+ }
+ if (!dst->dev) {
+ rc = -ENODEV;
+ goto out_rel;
+ }
+ rcu_read_lock();
+ if (!prop->ipv6_prefixes_cnt)
+ rc = smc_clc_prfx_match4_rcu(dst->dev, prop);
+ else
+ rc = smc_clc_prfx_match6_rcu(dst->dev, prop);
+ rcu_read_unlock();
+out_rel:
+ dst_release(dst);
+out:
+ return rc;
+}
+
+/* Wait for data on the tcp-socket, analyze received data
+ * Returns:
+ * 0 if success and it was not a decline that we received.
+ * SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send.
+ * clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise.
+ */
+int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
+ u8 expected_type, unsigned long timeout)
+{
+ long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo;
+ struct sock *clc_sk = smc->clcsock->sk;
+ struct smc_clc_msg_hdr *clcm = buf;
+ struct msghdr msg = {NULL, 0};
+ int reason_code = 0;
+ struct kvec vec = {buf, buflen};
+ int len, datlen, recvlen;
+ bool check_trl = true;
+ int krflags;
+
+ /* peek the first few bytes to determine length of data to receive
+ * so we don't consume any subsequent CLC message or payload data
+ * in the TCP byte stream
+ */
+ /*
+ * Caller must make sure that buflen is no less than
+ * sizeof(struct smc_clc_msg_hdr)
+ */
+ krflags = MSG_PEEK | MSG_WAITALL;
+ clc_sk->sk_rcvtimeo = timeout;
+ iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1,
+ sizeof(struct smc_clc_msg_hdr));
+ len = sock_recvmsg(smc->clcsock, &msg, krflags);
+ if (signal_pending(current)) {
+ reason_code = -EINTR;
+ clc_sk->sk_err = EINTR;
+ smc->sk.sk_err = EINTR;
+ goto out;
+ }
+ if (clc_sk->sk_err) {
+ reason_code = -clc_sk->sk_err;
+ if (clc_sk->sk_err == EAGAIN &&
+ expected_type == SMC_CLC_DECLINE)
+ clc_sk->sk_err = 0; /* reset for fallback usage */
+ else
+ smc->sk.sk_err = clc_sk->sk_err;
+ goto out;
+ }
+ if (!len) { /* peer has performed orderly shutdown */
+ smc->sk.sk_err = ECONNRESET;
+ reason_code = -ECONNRESET;
+ goto out;
+ }
+ if (len < 0) {
+ if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE)
+ smc->sk.sk_err = -len;
+ reason_code = len;
+ goto out;
+ }
+ datlen = ntohs(clcm->length);
+ if ((len < sizeof(struct smc_clc_msg_hdr)) ||
+ (clcm->version < SMC_V1) ||
+ ((clcm->type != SMC_CLC_DECLINE) &&
+ (clcm->type != expected_type))) {
+ smc->sk.sk_err = EPROTO;
+ reason_code = -EPROTO;
+ goto out;
+ }
+
+ /* receive the complete CLC message */
+ memset(&msg, 0, sizeof(struct msghdr));
+ if (datlen > buflen) {
+ check_trl = false;
+ recvlen = buflen;
+ } else {
+ recvlen = datlen;
+ }
+ iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
+ krflags = MSG_WAITALL;
+ len = sock_recvmsg(smc->clcsock, &msg, krflags);
+ if (len < recvlen || !smc_clc_msg_hdr_valid(clcm, check_trl)) {
+ smc->sk.sk_err = EPROTO;
+ reason_code = -EPROTO;
+ goto out;
+ }
+ datlen -= len;
+ while (datlen) {
+ u8 tmp[SMC_CLC_RECV_BUF_LEN];
+
+ vec.iov_base = &tmp;
+ vec.iov_len = SMC_CLC_RECV_BUF_LEN;
+ /* receive remaining proposal message */
+ recvlen = datlen > SMC_CLC_RECV_BUF_LEN ?
+ SMC_CLC_RECV_BUF_LEN : datlen;
+ iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
+ len = sock_recvmsg(smc->clcsock, &msg, krflags);
+ datlen -= len;
+ }
+ if (clcm->type == SMC_CLC_DECLINE) {
+ struct smc_clc_msg_decline *dclc;
+
+ dclc = (struct smc_clc_msg_decline *)clcm;
+ reason_code = SMC_CLC_DECL_PEERDECL;
+ smc->peer_diagnosis = ntohl(dclc->peer_diagnosis);
+ if (((struct smc_clc_msg_decline *)buf)->hdr.typev2 &
+ SMC_FIRST_CONTACT_MASK) {
+ smc->conn.lgr->sync_err = 1;
+ smc_lgr_terminate_sched(smc->conn.lgr);
+ }
+ }
+
+out:
+ clc_sk->sk_rcvtimeo = rcvtimeo;
+ return reason_code;
+}
+
+/* send CLC DECLINE message across internal TCP socket */
+int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version)
+{
+ struct smc_clc_msg_decline *dclc_v1;
+ struct smc_clc_msg_decline_v2 dclc;
+ struct msghdr msg;
+ int len, send_len;
+ struct kvec vec;
+
+ dclc_v1 = (struct smc_clc_msg_decline *)&dclc;
+ memset(&dclc, 0, sizeof(dclc));
+ memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
+ dclc.hdr.type = SMC_CLC_DECLINE;
+ dclc.hdr.version = version;
+ dclc.os_type = version == SMC_V1 ? 0 : SMC_CLC_OS_LINUX;
+ dclc.hdr.typev2 = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ?
+ SMC_FIRST_CONTACT_MASK : 0;
+ if ((!smc_conn_lgr_valid(&smc->conn) || !smc->conn.lgr->is_smcd) &&
+ smc_ib_is_valid_local_systemid())
+ memcpy(dclc.id_for_peer, local_systemid,
+ sizeof(local_systemid));
+ dclc.peer_diagnosis = htonl(peer_diag_info);
+ if (version == SMC_V1) {
+ memcpy(dclc_v1->trl.eyecatcher, SMC_EYECATCHER,
+ sizeof(SMC_EYECATCHER));
+ send_len = sizeof(*dclc_v1);
+ } else {
+ memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER,
+ sizeof(SMC_EYECATCHER));
+ send_len = sizeof(dclc);
+ }
+ dclc.hdr.length = htons(send_len);
+
+ memset(&msg, 0, sizeof(msg));
+ vec.iov_base = &dclc;
+ vec.iov_len = send_len;
+ len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, send_len);
+ if (len < 0 || len < send_len)
+ len = -EPROTO;
+ return len > 0 ? 0 : len;
+}
+
+/* send CLC PROPOSAL message across internal TCP socket */
+int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini)
+{
+ struct smc_clc_smcd_v2_extension *smcd_v2_ext;
+ struct smc_clc_msg_proposal_prefix *pclc_prfx;
+ struct smc_clc_msg_proposal *pclc_base;
+ struct smc_clc_smcd_gid_chid *gidchids;
+ struct smc_clc_msg_proposal_area *pclc;
+ struct smc_clc_ipv6_prefix *ipv6_prfx;
+ struct smc_clc_v2_extension *v2_ext;
+ struct smc_clc_msg_smcd *pclc_smcd;
+ struct smc_clc_msg_trail *trl;
+ int len, i, plen, rc;
+ int reason_code = 0;
+ struct kvec vec[8];
+ struct msghdr msg;
+
+ pclc = kzalloc(sizeof(*pclc), GFP_KERNEL);
+ if (!pclc)
+ return -ENOMEM;
+
+ pclc_base = &pclc->pclc_base;
+ pclc_smcd = &pclc->pclc_smcd;
+ pclc_prfx = &pclc->pclc_prfx;
+ ipv6_prfx = pclc->pclc_prfx_ipv6;
+ v2_ext = &pclc->pclc_v2_ext;
+ smcd_v2_ext = &pclc->pclc_smcd_v2_ext;
+ gidchids = pclc->pclc_gidchids;
+ trl = &pclc->pclc_trl;
+
+ pclc_base->hdr.version = SMC_V2;
+ pclc_base->hdr.typev1 = ini->smc_type_v1;
+ pclc_base->hdr.typev2 = ini->smc_type_v2;
+ plen = sizeof(*pclc_base) + sizeof(*pclc_smcd) + sizeof(*trl);
+
+ /* retrieve ip prefixes for CLC proposal msg */
+ if (ini->smc_type_v1 != SMC_TYPE_N) {
+ rc = smc_clc_prfx_set(smc->clcsock, pclc_prfx, ipv6_prfx);
+ if (rc) {
+ if (ini->smc_type_v2 == SMC_TYPE_N) {
+ kfree(pclc);
+ return SMC_CLC_DECL_CNFERR;
+ }
+ pclc_base->hdr.typev1 = SMC_TYPE_N;
+ } else {
+ pclc_base->iparea_offset = htons(sizeof(*pclc_smcd));
+ plen += sizeof(*pclc_prfx) +
+ pclc_prfx->ipv6_prefixes_cnt *
+ sizeof(ipv6_prfx[0]);
+ }
+ }
+
+ /* build SMC Proposal CLC message */
+ memcpy(pclc_base->hdr.eyecatcher, SMC_EYECATCHER,
+ sizeof(SMC_EYECATCHER));
+ pclc_base->hdr.type = SMC_CLC_PROPOSAL;
+ if (smcr_indicated(ini->smc_type_v1)) {
+ /* add SMC-R specifics */
+ memcpy(pclc_base->lcl.id_for_peer, local_systemid,
+ sizeof(local_systemid));
+ memcpy(pclc_base->lcl.gid, ini->ib_gid, SMC_GID_SIZE);
+ memcpy(pclc_base->lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1],
+ ETH_ALEN);
+ }
+ if (smcd_indicated(ini->smc_type_v1)) {
+ /* add SMC-D specifics */
+ if (ini->ism_dev[0]) {
+ pclc_smcd->ism.gid = htonll(ini->ism_dev[0]->local_gid);
+ pclc_smcd->ism.chid =
+ htons(smc_ism_get_chid(ini->ism_dev[0]));
+ }
+ }
+ if (ini->smc_type_v2 == SMC_TYPE_N) {
+ pclc_smcd->v2_ext_offset = 0;
+ } else {
+ struct smc_clc_eid_entry *ueident;
+ u16 v2_ext_offset;
+
+ v2_ext->hdr.flag.release = SMC_RELEASE;
+ v2_ext_offset = sizeof(*pclc_smcd) -
+ offsetofend(struct smc_clc_msg_smcd, v2_ext_offset);
+ if (ini->smc_type_v1 != SMC_TYPE_N)
+ v2_ext_offset += sizeof(*pclc_prfx) +
+ pclc_prfx->ipv6_prefixes_cnt *
+ sizeof(ipv6_prfx[0]);
+ pclc_smcd->v2_ext_offset = htons(v2_ext_offset);
+ plen += sizeof(*v2_ext);
+
+ read_lock(&smc_clc_eid_table.lock);
+ v2_ext->hdr.eid_cnt = smc_clc_eid_table.ueid_cnt;
+ plen += smc_clc_eid_table.ueid_cnt * SMC_MAX_EID_LEN;
+ i = 0;
+ list_for_each_entry(ueident, &smc_clc_eid_table.list, list) {
+ memcpy(v2_ext->user_eids[i++], ueident->eid,
+ sizeof(ueident->eid));
+ }
+ read_unlock(&smc_clc_eid_table.lock);
+ }
+ if (smcd_indicated(ini->smc_type_v2)) {
+ u8 *eid = NULL;
+
+ v2_ext->hdr.flag.seid = smc_clc_eid_table.seid_enabled;
+ v2_ext->hdr.ism_gid_cnt = ini->ism_offered_cnt;
+ v2_ext->hdr.smcd_v2_ext_offset = htons(sizeof(*v2_ext) -
+ offsetofend(struct smc_clnt_opts_area_hdr,
+ smcd_v2_ext_offset) +
+ v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);
+ smc_ism_get_system_eid(&eid);
+ if (eid && v2_ext->hdr.flag.seid)
+ memcpy(smcd_v2_ext->system_eid, eid, SMC_MAX_EID_LEN);
+ plen += sizeof(*smcd_v2_ext);
+ if (ini->ism_offered_cnt) {
+ for (i = 1; i <= ini->ism_offered_cnt; i++) {
+ gidchids[i - 1].gid =
+ htonll(ini->ism_dev[i]->local_gid);
+ gidchids[i - 1].chid =
+ htons(smc_ism_get_chid(ini->ism_dev[i]));
+ }
+ plen += ini->ism_offered_cnt *
+ sizeof(struct smc_clc_smcd_gid_chid);
+ }
+ }
+ if (smcr_indicated(ini->smc_type_v2))
+ memcpy(v2_ext->roce, ini->smcrv2.ib_gid_v2, SMC_GID_SIZE);
+
+ pclc_base->hdr.length = htons(plen);
+ memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
+
+ /* send SMC Proposal CLC message */
+ memset(&msg, 0, sizeof(msg));
+ i = 0;
+ vec[i].iov_base = pclc_base;
+ vec[i++].iov_len = sizeof(*pclc_base);
+ vec[i].iov_base = pclc_smcd;
+ vec[i++].iov_len = sizeof(*pclc_smcd);
+ if (ini->smc_type_v1 != SMC_TYPE_N) {
+ vec[i].iov_base = pclc_prfx;
+ vec[i++].iov_len = sizeof(*pclc_prfx);
+ if (pclc_prfx->ipv6_prefixes_cnt > 0) {
+ vec[i].iov_base = ipv6_prfx;
+ vec[i++].iov_len = pclc_prfx->ipv6_prefixes_cnt *
+ sizeof(ipv6_prfx[0]);
+ }
+ }
+ if (ini->smc_type_v2 != SMC_TYPE_N) {
+ vec[i].iov_base = v2_ext;
+ vec[i++].iov_len = sizeof(*v2_ext) +
+ (v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);
+ if (smcd_indicated(ini->smc_type_v2)) {
+ vec[i].iov_base = smcd_v2_ext;
+ vec[i++].iov_len = sizeof(*smcd_v2_ext);
+ if (ini->ism_offered_cnt) {
+ vec[i].iov_base = gidchids;
+ vec[i++].iov_len = ini->ism_offered_cnt *
+ sizeof(struct smc_clc_smcd_gid_chid);
+ }
+ }
+ }
+ vec[i].iov_base = trl;
+ vec[i++].iov_len = sizeof(*trl);
+ /* due to the few bytes needed for clc-handshake this cannot block */
+ len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen);
+ if (len < 0) {
+ smc->sk.sk_err = smc->clcsock->sk->sk_err;
+ reason_code = -smc->sk.sk_err;
+ } else if (len < ntohs(pclc_base->hdr.length)) {
+ reason_code = -ENETUNREACH;
+ smc->sk.sk_err = -reason_code;
+ }
+
+ kfree(pclc);
+ return reason_code;
+}
+
+/* build and send CLC CONFIRM / ACCEPT message */
+static int smc_clc_send_confirm_accept(struct smc_sock *smc,
+ struct smc_clc_msg_accept_confirm_v2 *clc_v2,
+ int first_contact, u8 version,
+ u8 *eid, struct smc_init_info *ini)
+{
+ struct smc_connection *conn = &smc->conn;
+ struct smc_clc_msg_accept_confirm *clc;
+ struct smc_clc_first_contact_ext fce;
+ struct smc_clc_fce_gid_ext gle;
+ struct smc_clc_msg_trail trl;
+ struct kvec vec[5];
+ struct msghdr msg;
+ int i, len;
+
+ /* send SMC Confirm CLC msg */
+ clc = (struct smc_clc_msg_accept_confirm *)clc_v2;
+ clc->hdr.version = version; /* SMC version */
+ if (first_contact)
+ clc->hdr.typev2 |= SMC_FIRST_CONTACT_MASK;
+ if (conn->lgr->is_smcd) {
+ /* SMC-D specific settings */
+ memcpy(clc->hdr.eyecatcher, SMCD_EYECATCHER,
+ sizeof(SMCD_EYECATCHER));
+ clc->hdr.typev1 = SMC_TYPE_D;
+ clc->d0.gid = conn->lgr->smcd->local_gid;
+ clc->d0.token = conn->rmb_desc->token;
+ clc->d0.dmbe_size = conn->rmbe_size_comp;
+ clc->d0.dmbe_idx = 0;
+ memcpy(&clc->d0.linkid, conn->lgr->id, SMC_LGR_ID_SIZE);
+ if (version == SMC_V1) {
+ clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
+ } else {
+ clc_v2->d1.chid =
+ htons(smc_ism_get_chid(conn->lgr->smcd));
+ if (eid && eid[0])
+ memcpy(clc_v2->d1.eid, eid, SMC_MAX_EID_LEN);
+ len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2;
+ if (first_contact)
+ smc_clc_fill_fce(&fce, &len);
+ clc_v2->hdr.length = htons(len);
+ }
+ memcpy(trl.eyecatcher, SMCD_EYECATCHER,
+ sizeof(SMCD_EYECATCHER));
+ } else {
+ struct smc_link *link = conn->lnk;
+
+ /* SMC-R specific settings */
+ memcpy(clc->hdr.eyecatcher, SMC_EYECATCHER,
+ sizeof(SMC_EYECATCHER));
+ clc->hdr.typev1 = SMC_TYPE_R;
+ clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
+ memcpy(clc->r0.lcl.id_for_peer, local_systemid,
+ sizeof(local_systemid));
+ memcpy(&clc->r0.lcl.gid, link->gid, SMC_GID_SIZE);
+ memcpy(&clc->r0.lcl.mac, &link->smcibdev->mac[link->ibport - 1],
+ ETH_ALEN);
+ hton24(clc->r0.qpn, link->roce_qp->qp_num);
+ clc->r0.rmb_rkey =
+ htonl(conn->rmb_desc->mr[link->link_idx]->rkey);
+ clc->r0.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */
+ clc->r0.rmbe_alert_token = htonl(conn->alert_token_local);
+ switch (clc->hdr.type) {
+ case SMC_CLC_ACCEPT:
+ clc->r0.qp_mtu = link->path_mtu;
+ break;
+ case SMC_CLC_CONFIRM:
+ clc->r0.qp_mtu = min(link->path_mtu, link->peer_mtu);
+ break;
+ }
+ clc->r0.rmbe_size = conn->rmbe_size_comp;
+ clc->r0.rmb_dma_addr = conn->rmb_desc->is_vm ?
+ cpu_to_be64((uintptr_t)conn->rmb_desc->cpu_addr) :
+ cpu_to_be64((u64)sg_dma_address
+ (conn->rmb_desc->sgt[link->link_idx].sgl));
+ hton24(clc->r0.psn, link->psn_initial);
+ if (version == SMC_V1) {
+ clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
+ } else {
+ if (eid && eid[0])
+ memcpy(clc_v2->r1.eid, eid, SMC_MAX_EID_LEN);
+ len = SMCR_CLC_ACCEPT_CONFIRM_LEN_V2;
+ if (first_contact) {
+ smc_clc_fill_fce(&fce, &len);
+ fce.v2_direct = !link->lgr->uses_gateway;
+ memset(&gle, 0, sizeof(gle));
+ if (ini && clc->hdr.type == SMC_CLC_CONFIRM) {
+ gle.gid_cnt = ini->smcrv2.gidlist.len;
+ len += sizeof(gle);
+ len += gle.gid_cnt * sizeof(gle.gid[0]);
+ } else {
+ len += sizeof(gle.reserved);
+ }
+ }
+ clc_v2->hdr.length = htons(len);
+ }
+ memcpy(trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
+ }
+
+ memset(&msg, 0, sizeof(msg));
+ i = 0;
+ vec[i].iov_base = clc_v2;
+ if (version > SMC_V1)
+ vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ?
+ SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 :
+ SMCR_CLC_ACCEPT_CONFIRM_LEN_V2) -
+ sizeof(trl);
+ else
+ vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ?
+ SMCD_CLC_ACCEPT_CONFIRM_LEN :
+ SMCR_CLC_ACCEPT_CONFIRM_LEN) -
+ sizeof(trl);
+ if (version > SMC_V1 && first_contact) {
+ vec[i].iov_base = &fce;
+ vec[i++].iov_len = sizeof(fce);
+ if (!conn->lgr->is_smcd) {
+ if (clc->hdr.type == SMC_CLC_CONFIRM) {
+ vec[i].iov_base = &gle;
+ vec[i++].iov_len = sizeof(gle);
+ vec[i].iov_base = &ini->smcrv2.gidlist.list;
+ vec[i++].iov_len = gle.gid_cnt *
+ sizeof(gle.gid[0]);
+ } else {
+ vec[i].iov_base = &gle.reserved;
+ vec[i++].iov_len = sizeof(gle.reserved);
+ }
+ }
+ }
+ vec[i].iov_base = &trl;
+ vec[i++].iov_len = sizeof(trl);
+ return kernel_sendmsg(smc->clcsock, &msg, vec, 1,
+ ntohs(clc->hdr.length));
+}
+
+/* send CLC CONFIRM message across internal TCP socket */
+int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
+ u8 version, u8 *eid, struct smc_init_info *ini)
+{
+ struct smc_clc_msg_accept_confirm_v2 cclc_v2;
+ int reason_code = 0;
+ int len;
+
+ /* send SMC Confirm CLC msg */
+ memset(&cclc_v2, 0, sizeof(cclc_v2));
+ cclc_v2.hdr.type = SMC_CLC_CONFIRM;
+ len = smc_clc_send_confirm_accept(smc, &cclc_v2, clnt_first_contact,
+ version, eid, ini);
+ if (len < ntohs(cclc_v2.hdr.length)) {
+ if (len >= 0) {
+ reason_code = -ENETUNREACH;
+ smc->sk.sk_err = -reason_code;
+ } else {
+ smc->sk.sk_err = smc->clcsock->sk->sk_err;
+ reason_code = -smc->sk.sk_err;
+ }
+ }
+ return reason_code;
+}
+
+/* send CLC ACCEPT message across internal TCP socket */
+int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact,
+ u8 version, u8 *negotiated_eid)
+{
+ struct smc_clc_msg_accept_confirm_v2 aclc_v2;
+ int len;
+
+ memset(&aclc_v2, 0, sizeof(aclc_v2));
+ aclc_v2.hdr.type = SMC_CLC_ACCEPT;
+ len = smc_clc_send_confirm_accept(new_smc, &aclc_v2, srv_first_contact,
+ version, negotiated_eid, NULL);
+ if (len < ntohs(aclc_v2.hdr.length))
+ len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err;
+
+ return len > 0 ? 0 : len;
+}
+
+void smc_clc_get_hostname(u8 **host)
+{
+ *host = &smc_hostname[0];
+}
+
+void __init smc_clc_init(void)
+{
+ struct new_utsname *u;
+
+ memset(smc_hostname, _S, sizeof(smc_hostname)); /* ASCII blanks */
+ u = utsname();
+ memcpy(smc_hostname, u->nodename,
+ min_t(size_t, strlen(u->nodename), sizeof(smc_hostname)));
+
+ INIT_LIST_HEAD(&smc_clc_eid_table.list);
+ rwlock_init(&smc_clc_eid_table.lock);
+ smc_clc_eid_table.ueid_cnt = 0;
+ smc_clc_eid_table.seid_enabled = 1;
+}
+
+void smc_clc_exit(void)
+{
+ smc_clc_ueid_remove(NULL);
+}