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smc_clc.c
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// 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;
snprintf(ueid_str, sizeof(ueid_str), "%s", ueid);
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);
snprintf(seid_str, sizeof(seid_str), "%s", seid);
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, READ, &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, READ, &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, READ, &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 || !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;