| // 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 IS_ENABLED(CONFIG_S390) |
| if (!rc && !smc_clc_eid_table.ueid_cnt) { |
| smc_clc_eid_table.seid_enabled = 1; |
| rc = -EAGAIN; /* indicate success and enabling of seid */ |
| } |
| #endif |
| 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) |
| { |
| #if IS_ENABLED(CONFIG_S390) |
| write_lock(&smc_clc_eid_table.lock); |
| smc_clc_eid_table.seid_enabled = 1; |
| write_unlock(&smc_clc_eid_table.lock); |
| return 0; |
| #else |
| return -EOPNOTSUPP; |
| #endif |
| } |
| |
| int smc_nl_disable_seid(struct sk_buff *skb, struct genl_info *info) |
| { |
| int rc = 0; |
| |
| #if IS_ENABLED(CONFIG_S390) |
| 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); |
| #else |
| rc = -EOPNOTSUPP; |
| #endif |
| 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 *clc) |
| { |
| struct smc_clc_msg_hdr *hdr = &clc->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) |
| 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 int smc_clc_fill_fce_v2x(struct smc_clc_first_contact_ext_v2x *fce_v2x, |
| struct smc_init_info *ini) |
| { |
| int ret = sizeof(*fce_v2x); |
| |
| memset(fce_v2x, 0, sizeof(*fce_v2x)); |
| fce_v2x->fce_v2_base.os_type = SMC_CLC_OS_LINUX; |
| fce_v2x->fce_v2_base.release = ini->release_nr; |
| memcpy(fce_v2x->fce_v2_base.hostname, |
| smc_hostname, sizeof(smc_hostname)); |
| if (ini->is_smcd && ini->release_nr < SMC_RELEASE_1) { |
| ret = sizeof(struct smc_clc_first_contact_ext); |
| goto out; |
| } |
| |
| if (ini->release_nr >= SMC_RELEASE_1) { |
| if (!ini->is_smcd) { |
| fce_v2x->max_conns = ini->max_conns; |
| fce_v2x->max_links = ini->max_links; |
| } |
| fce_v2x->feature_mask = htons(ini->feature_mask); |
| } |
| |
| out: |
| return ret; |
| } |
| |
| /* 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 *clc; |
| 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 = (struct smc_clc_msg_accept_confirm *)clcm; |
| if (!smc_clc_msg_acc_conf_valid(clc)) |
| return false; |
| trl = (struct smc_clc_msg_trail *) |
| ((u8 *)clc + ntohs(clc->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 net *net = sock_net(&smc->sk); |
| struct smc_clc_v2_extension *v2_ext; |
| struct smc_clc_msg_smcd *pclc_smcd; |
| struct smc_clc_msg_trail *trl; |
| struct smcd_dev *smcd; |
| 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)) { |
| struct smcd_gid smcd_gid; |
| |
| /* add SMC-D specifics */ |
| if (ini->ism_dev[0]) { |
| smcd = ini->ism_dev[0]; |
| smcd->ops->get_local_gid(smcd, &smcd_gid); |
| pclc_smcd->ism.gid = htonll(smcd_gid.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); |
| |
| v2_ext->feature_mask = htons(SMC_FEATURE_MASK); |
| 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)) { |
| struct smcd_gid smcd_gid; |
| u8 *eid = NULL; |
| int entry = 0; |
| |
| v2_ext->hdr.flag.seid = smc_clc_eid_table.seid_enabled; |
| 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++) { |
| smcd = ini->ism_dev[i]; |
| smcd->ops->get_local_gid(smcd, &smcd_gid); |
| gidchids[entry].chid = |
| htons(smc_ism_get_chid(ini->ism_dev[i])); |
| gidchids[entry].gid = htonll(smcd_gid.gid); |
| if (smc_ism_is_virtual(smcd)) { |
| /* a virtual ISM device takes two |
| * entries. CHID of the second entry |
| * repeats that of the first entry. |
| */ |
| gidchids[entry + 1].chid = |
| gidchids[entry].chid; |
| gidchids[entry + 1].gid = |
| htonll(smcd_gid.gid_ext); |
| entry++; |
| } |
| entry++; |
| } |
| plen += entry * sizeof(struct smc_clc_smcd_gid_chid); |
| } |
| v2_ext->hdr.ism_gid_cnt = entry; |
| } |
| if (smcr_indicated(ini->smc_type_v2)) { |
| memcpy(v2_ext->roce, ini->smcrv2.ib_gid_v2, SMC_GID_SIZE); |
| v2_ext->max_conns = net->smc.sysctl_max_conns_per_lgr; |
| v2_ext->max_links = net->smc.sysctl_max_links_per_lgr; |
| } |
| |
| 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 = v2_ext->hdr.ism_gid_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; |
| } |
| |
| static void |
| smcd_clc_prep_confirm_accept(struct smc_connection *conn, |
| struct smc_clc_msg_accept_confirm *clc, |
| int first_contact, u8 version, |
| u8 *eid, struct smc_init_info *ini, |
| int *fce_len, |
| struct smc_clc_first_contact_ext_v2x *fce_v2x, |
| struct smc_clc_msg_trail *trl) |
| { |
| struct smcd_dev *smcd = conn->lgr->smcd; |
| struct smcd_gid smcd_gid; |
| u16 chid; |
| int len; |
| |
| /* SMC-D specific settings */ |
| memcpy(clc->hdr.eyecatcher, SMCD_EYECATCHER, |
| sizeof(SMCD_EYECATCHER)); |
| smcd->ops->get_local_gid(smcd, &smcd_gid); |
| clc->hdr.typev1 = SMC_TYPE_D; |
| clc->d0.gid = htonll(smcd_gid.gid); |
| clc->d0.token = htonll(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 { |
| chid = smc_ism_get_chid(smcd); |
| clc->d1.chid = htons(chid); |
| if (eid && eid[0]) |
| memcpy(clc->d1.eid, eid, SMC_MAX_EID_LEN); |
| if (__smc_ism_is_virtual(chid)) |
| clc->d1.gid_ext = htonll(smcd_gid.gid_ext); |
| len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2; |
| if (first_contact) { |
| *fce_len = smc_clc_fill_fce_v2x(fce_v2x, ini); |
| len += *fce_len; |
| } |
| clc->hdr.length = htons(len); |
| } |
| memcpy(trl->eyecatcher, SMCD_EYECATCHER, |
| sizeof(SMCD_EYECATCHER)); |
| } |
| |
| static void |
| smcr_clc_prep_confirm_accept(struct smc_connection *conn, |
| struct smc_clc_msg_accept_confirm *clc, |
| int first_contact, u8 version, |
| u8 *eid, struct smc_init_info *ini, |
| int *fce_len, |
| struct smc_clc_first_contact_ext_v2x *fce_v2x, |
| struct smc_clc_fce_gid_ext *gle, |
| struct smc_clc_msg_trail *trl) |
| { |
| struct smc_link *link = conn->lnk; |
| int len; |
| |
| /* SMC-R specific settings */ |
| memcpy(clc->hdr.eyecatcher, SMC_EYECATCHER, |
| sizeof(SMC_EYECATCHER)); |
| clc->hdr.typev1 = SMC_TYPE_R; |
| 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->r1.eid, eid, SMC_MAX_EID_LEN); |
| len = SMCR_CLC_ACCEPT_CONFIRM_LEN_V2; |
| if (first_contact) { |
| *fce_len = smc_clc_fill_fce_v2x(fce_v2x, ini); |
| len += *fce_len; |
| fce_v2x->fce_v2_base.v2_direct = |
| !link->lgr->uses_gateway; |
| if (clc->hdr.type == SMC_CLC_CONFIRM) { |
| memset(gle, 0, sizeof(*gle)); |
| gle->gid_cnt = ini->smcrv2.gidlist.len; |
| len += sizeof(*gle); |
| len += gle->gid_cnt * sizeof(gle->gid[0]); |
| } |
| } |
| clc->hdr.length = htons(len); |
| } |
| memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); |
| } |
| |
| /* build and send CLC CONFIRM / ACCEPT message */ |
| static int smc_clc_send_confirm_accept(struct smc_sock *smc, |
| struct smc_clc_msg_accept_confirm *clc, |
| int first_contact, u8 version, |
| u8 *eid, struct smc_init_info *ini) |
| { |
| struct smc_clc_first_contact_ext_v2x fce_v2x; |
| struct smc_connection *conn = &smc->conn; |
| struct smc_clc_fce_gid_ext gle; |
| struct smc_clc_msg_trail trl; |
| int i, fce_len; |
| struct kvec vec[5]; |
| struct msghdr msg; |
| |
| /* send SMC Confirm CLC msg */ |
| clc->hdr.version = version; /* SMC version */ |
| if (first_contact) |
| clc->hdr.typev2 |= SMC_FIRST_CONTACT_MASK; |
| if (conn->lgr->is_smcd) |
| smcd_clc_prep_confirm_accept(conn, clc, first_contact, |
| version, eid, ini, &fce_len, |
| &fce_v2x, &trl); |
| else |
| smcr_clc_prep_confirm_accept(conn, clc, first_contact, |
| version, eid, ini, &fce_len, |
| &fce_v2x, &gle, &trl); |
| memset(&msg, 0, sizeof(msg)); |
| i = 0; |
| vec[i].iov_base = clc; |
| 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_v2x; |
| vec[i++].iov_len = fce_len; |
| 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]); |
| } |
| } |
| } |
| 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 cclc; |
| int reason_code = 0; |
| int len; |
| |
| /* send SMC Confirm CLC msg */ |
| memset(&cclc, 0, sizeof(cclc)); |
| cclc.hdr.type = SMC_CLC_CONFIRM; |
| len = smc_clc_send_confirm_accept(smc, &cclc, clnt_first_contact, |
| version, eid, ini); |
| if (len < ntohs(cclc.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_init_info *ini) |
| { |
| struct smc_clc_msg_accept_confirm aclc; |
| int len; |
| |
| memset(&aclc, 0, sizeof(aclc)); |
| aclc.hdr.type = SMC_CLC_ACCEPT; |
| len = smc_clc_send_confirm_accept(new_smc, &aclc, srv_first_contact, |
| version, negotiated_eid, ini); |
| if (len < ntohs(aclc.hdr.length)) |
| len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err; |
| |
| return len > 0 ? 0 : len; |
| } |
| |
| int smc_clc_srv_v2x_features_validate(struct smc_sock *smc, |
| struct smc_clc_msg_proposal *pclc, |
| struct smc_init_info *ini) |
| { |
| struct smc_clc_v2_extension *pclc_v2_ext; |
| struct net *net = sock_net(&smc->sk); |
| |
| ini->max_conns = SMC_CONN_PER_LGR_MAX; |
| ini->max_links = SMC_LINKS_ADD_LNK_MAX; |
| ini->feature_mask = SMC_FEATURE_MASK; |
| |
| if ((!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) || |
| ini->release_nr < SMC_RELEASE_1) |
| return 0; |
| |
| pclc_v2_ext = smc_get_clc_v2_ext(pclc); |
| if (!pclc_v2_ext) |
| return SMC_CLC_DECL_NOV2EXT; |
| |
| if (ini->smcr_version & SMC_V2) { |
| ini->max_conns = min_t(u8, pclc_v2_ext->max_conns, |
| net->smc.sysctl_max_conns_per_lgr); |
| if (ini->max_conns < SMC_CONN_PER_LGR_MIN) |
| return SMC_CLC_DECL_MAXCONNERR; |
| |
| ini->max_links = min_t(u8, pclc_v2_ext->max_links, |
| net->smc.sysctl_max_links_per_lgr); |
| if (ini->max_links < SMC_LINKS_ADD_LNK_MIN) |
| return SMC_CLC_DECL_MAXLINKERR; |
| } |
| |
| return 0; |
| } |
| |
| int smc_clc_clnt_v2x_features_validate(struct smc_clc_first_contact_ext *fce, |
| struct smc_init_info *ini) |
| { |
| struct smc_clc_first_contact_ext_v2x *fce_v2x = |
| (struct smc_clc_first_contact_ext_v2x *)fce; |
| |
| if (ini->release_nr < SMC_RELEASE_1) |
| return 0; |
| |
| if (!ini->is_smcd) { |
| if (fce_v2x->max_conns < SMC_CONN_PER_LGR_MIN) |
| return SMC_CLC_DECL_MAXCONNERR; |
| ini->max_conns = fce_v2x->max_conns; |
| |
| if (fce_v2x->max_links > SMC_LINKS_ADD_LNK_MAX || |
| fce_v2x->max_links < SMC_LINKS_ADD_LNK_MIN) |
| return SMC_CLC_DECL_MAXLINKERR; |
| ini->max_links = fce_v2x->max_links; |
| } |
| /* common supplemental features of server and client */ |
| ini->feature_mask = ntohs(fce_v2x->feature_mask) & SMC_FEATURE_MASK; |
| |
| return 0; |
| } |
| |
| int smc_clc_v2x_features_confirm_check(struct smc_clc_msg_accept_confirm *cclc, |
| struct smc_init_info *ini) |
| { |
| struct smc_clc_first_contact_ext *fce = |
| smc_get_clc_first_contact_ext(cclc, ini->is_smcd); |
| struct smc_clc_first_contact_ext_v2x *fce_v2x = |
| (struct smc_clc_first_contact_ext_v2x *)fce; |
| |
| if (cclc->hdr.version == SMC_V1 || |
| !(cclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) |
| return 0; |
| |
| if (ini->release_nr != fce->release) |
| return SMC_CLC_DECL_RELEASEERR; |
| |
| if (fce->release < SMC_RELEASE_1) |
| return 0; |
| |
| if (!ini->is_smcd) { |
| if (fce_v2x->max_conns != ini->max_conns) |
| return SMC_CLC_DECL_MAXCONNERR; |
| if (fce_v2x->max_links != ini->max_links) |
| return SMC_CLC_DECL_MAXLINKERR; |
| } |
| /* common supplemental features returned by client */ |
| ini->feature_mask = ntohs(fce_v2x->feature_mask); |
| |
| return 0; |
| } |
| |
| 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; |
| #if IS_ENABLED(CONFIG_S390) |
| smc_clc_eid_table.seid_enabled = 1; |
| #else |
| smc_clc_eid_table.seid_enabled = 0; |
| #endif |
| } |
| |
| void smc_clc_exit(void) |
| { |
| smc_clc_ueid_remove(NULL); |
| } |