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![Karsten Graul](/assets/img/avatar_default.png)
Coverity stumbled over a missing error check in smc_clc_prfx_set():
*** CID 1475954: Error handling issues (CHECKED_RETURN)
/net/smc/smc_clc.c: 233 in smc_clc_prfx_set()
>>> CID 1475954: Error handling issues (CHECKED_RETURN)
>>> Calling "kernel_getsockname" without checking return value (as is done elsewhere 8 out of 10 times).
233 kernel_getsockname(clcsock, (struct sockaddr *)&addrs);
Add the return code check in smc_clc_prfx_set().
Fixes: c246d942ea
("net/smc: restructure netinfo for CLC proposal msgs")
Reported-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
789 lines
23 KiB
C
789 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* CLC (connection layer control) handshake over initial TCP socket to
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* prepare for RDMA traffic
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*
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* Copyright IBM Corp. 2016, 2018
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*
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* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
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*/
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#include <linux/in.h>
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#include <linux/inetdevice.h>
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#include <linux/if_ether.h>
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#include <linux/sched/signal.h>
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#include <linux/utsname.h>
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#include <linux/ctype.h>
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#include <net/addrconf.h>
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#include <net/sock.h>
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#include <net/tcp.h>
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#include "smc.h"
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#include "smc_core.h"
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#include "smc_clc.h"
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#include "smc_ib.h"
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#include "smc_ism.h"
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#define SMCR_CLC_ACCEPT_CONFIRM_LEN 68
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#define SMCD_CLC_ACCEPT_CONFIRM_LEN 48
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#define SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 78
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#define SMC_CLC_RECV_BUF_LEN 100
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/* eye catcher "SMCR" EBCDIC for CLC messages */
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static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'};
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/* eye catcher "SMCD" EBCDIC for CLC messages */
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static const char SMCD_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xc4'};
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static u8 smc_hostname[SMC_MAX_HOSTNAME_LEN];
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/* check arriving CLC proposal */
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static bool smc_clc_msg_prop_valid(struct smc_clc_msg_proposal *pclc)
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{
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struct smc_clc_msg_proposal_prefix *pclc_prfx;
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struct smc_clc_smcd_v2_extension *smcd_v2_ext;
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struct smc_clc_msg_hdr *hdr = &pclc->hdr;
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struct smc_clc_v2_extension *v2_ext;
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v2_ext = smc_get_clc_v2_ext(pclc);
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pclc_prfx = smc_clc_proposal_get_prefix(pclc);
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if (hdr->version == SMC_V1) {
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if (hdr->typev1 == SMC_TYPE_N)
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return false;
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if (ntohs(hdr->length) !=
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sizeof(*pclc) + ntohs(pclc->iparea_offset) +
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sizeof(*pclc_prfx) +
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pclc_prfx->ipv6_prefixes_cnt *
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sizeof(struct smc_clc_ipv6_prefix) +
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sizeof(struct smc_clc_msg_trail))
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return false;
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} else {
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if (ntohs(hdr->length) !=
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sizeof(*pclc) +
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sizeof(struct smc_clc_msg_smcd) +
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(hdr->typev1 != SMC_TYPE_N ?
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sizeof(*pclc_prfx) +
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pclc_prfx->ipv6_prefixes_cnt *
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sizeof(struct smc_clc_ipv6_prefix) : 0) +
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(hdr->typev2 != SMC_TYPE_N ?
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sizeof(*v2_ext) +
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v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN : 0) +
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(smcd_indicated(hdr->typev2) ?
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sizeof(*smcd_v2_ext) + v2_ext->hdr.ism_gid_cnt *
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sizeof(struct smc_clc_smcd_gid_chid) :
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0) +
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sizeof(struct smc_clc_msg_trail))
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return false;
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}
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return true;
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}
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/* check arriving CLC accept or confirm */
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static bool
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smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm_v2 *clc_v2)
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{
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struct smc_clc_msg_hdr *hdr = &clc_v2->hdr;
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if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
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return false;
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if (hdr->version == SMC_V1) {
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if ((hdr->typev1 == SMC_TYPE_R &&
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ntohs(hdr->length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) ||
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(hdr->typev1 == SMC_TYPE_D &&
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ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN))
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return false;
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} else {
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if (hdr->typev1 == SMC_TYPE_D &&
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ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 &&
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(ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 +
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sizeof(struct smc_clc_first_contact_ext)))
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return false;
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}
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return true;
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}
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static void smc_clc_fill_fce(struct smc_clc_first_contact_ext *fce, int *len)
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{
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memset(fce, 0, sizeof(*fce));
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fce->os_type = SMC_CLC_OS_LINUX;
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fce->release = SMC_RELEASE;
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memcpy(fce->hostname, smc_hostname, sizeof(smc_hostname));
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(*len) += sizeof(*fce);
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}
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/* check if received message has a correct header length and contains valid
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* heading and trailing eyecatchers
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*/
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static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl)
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{
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struct smc_clc_msg_accept_confirm_v2 *clc_v2;
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struct smc_clc_msg_proposal *pclc;
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struct smc_clc_msg_decline *dclc;
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struct smc_clc_msg_trail *trl;
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if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
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memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
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return false;
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switch (clcm->type) {
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case SMC_CLC_PROPOSAL:
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pclc = (struct smc_clc_msg_proposal *)clcm;
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if (!smc_clc_msg_prop_valid(pclc))
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return false;
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trl = (struct smc_clc_msg_trail *)
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((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl));
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break;
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case SMC_CLC_ACCEPT:
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case SMC_CLC_CONFIRM:
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clc_v2 = (struct smc_clc_msg_accept_confirm_v2 *)clcm;
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if (!smc_clc_msg_acc_conf_valid(clc_v2))
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return false;
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trl = (struct smc_clc_msg_trail *)
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((u8 *)clc_v2 + ntohs(clc_v2->hdr.length) -
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sizeof(*trl));
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break;
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case SMC_CLC_DECLINE:
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dclc = (struct smc_clc_msg_decline *)clcm;
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if (ntohs(dclc->hdr.length) != sizeof(*dclc))
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return false;
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trl = &dclc->trl;
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break;
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default:
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return false;
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}
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if (check_trl &&
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memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
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memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
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return false;
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return true;
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}
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/* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */
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static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4,
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struct smc_clc_msg_proposal_prefix *prop)
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{
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struct in_device *in_dev = __in_dev_get_rcu(dst->dev);
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const struct in_ifaddr *ifa;
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if (!in_dev)
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return -ENODEV;
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in_dev_for_each_ifa_rcu(ifa, in_dev) {
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if (!inet_ifa_match(ipv4, ifa))
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continue;
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prop->prefix_len = inet_mask_len(ifa->ifa_mask);
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prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask;
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/* prop->ipv6_prefixes_cnt = 0; already done by memset before */
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return 0;
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}
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return -ENOENT;
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}
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/* fill CLC proposal msg with ipv6 prefixes from device */
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static int smc_clc_prfx_set6_rcu(struct dst_entry *dst,
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struct smc_clc_msg_proposal_prefix *prop,
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struct smc_clc_ipv6_prefix *ipv6_prfx)
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{
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#if IS_ENABLED(CONFIG_IPV6)
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struct inet6_dev *in6_dev = __in6_dev_get(dst->dev);
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struct inet6_ifaddr *ifa;
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int cnt = 0;
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if (!in6_dev)
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return -ENODEV;
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/* use a maximum of 8 IPv6 prefixes from device */
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list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
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if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
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continue;
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ipv6_addr_prefix(&ipv6_prfx[cnt].prefix,
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&ifa->addr, ifa->prefix_len);
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ipv6_prfx[cnt].prefix_len = ifa->prefix_len;
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cnt++;
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if (cnt == SMC_CLC_MAX_V6_PREFIX)
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break;
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}
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prop->ipv6_prefixes_cnt = cnt;
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if (cnt)
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return 0;
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#endif
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return -ENOENT;
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}
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/* retrieve and set prefixes in CLC proposal msg */
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static int smc_clc_prfx_set(struct socket *clcsock,
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struct smc_clc_msg_proposal_prefix *prop,
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struct smc_clc_ipv6_prefix *ipv6_prfx)
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{
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struct dst_entry *dst = sk_dst_get(clcsock->sk);
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struct sockaddr_storage addrs;
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struct sockaddr_in6 *addr6;
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struct sockaddr_in *addr;
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int rc = -ENOENT;
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if (!dst) {
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rc = -ENOTCONN;
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goto out;
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}
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if (!dst->dev) {
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rc = -ENODEV;
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goto out_rel;
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}
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/* get address to which the internal TCP socket is bound */
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if (kernel_getsockname(clcsock, (struct sockaddr *)&addrs) < 0)
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goto out_rel;
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/* analyze IP specific data of net_device belonging to TCP socket */
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addr6 = (struct sockaddr_in6 *)&addrs;
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rcu_read_lock();
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if (addrs.ss_family == PF_INET) {
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/* IPv4 */
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addr = (struct sockaddr_in *)&addrs;
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rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop);
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} else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) {
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/* mapped IPv4 address - peer is IPv4 only */
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rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3],
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prop);
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} else {
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/* IPv6 */
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rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx);
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}
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rcu_read_unlock();
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out_rel:
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dst_release(dst);
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out:
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return rc;
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}
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/* match ipv4 addrs of dev against addr in CLC proposal */
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static int smc_clc_prfx_match4_rcu(struct net_device *dev,
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struct smc_clc_msg_proposal_prefix *prop)
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{
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struct in_device *in_dev = __in_dev_get_rcu(dev);
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const struct in_ifaddr *ifa;
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if (!in_dev)
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return -ENODEV;
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in_dev_for_each_ifa_rcu(ifa, in_dev) {
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if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) &&
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inet_ifa_match(prop->outgoing_subnet, ifa))
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return 0;
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}
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return -ENOENT;
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}
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/* match ipv6 addrs of dev against addrs in CLC proposal */
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static int smc_clc_prfx_match6_rcu(struct net_device *dev,
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struct smc_clc_msg_proposal_prefix *prop)
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{
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#if IS_ENABLED(CONFIG_IPV6)
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struct inet6_dev *in6_dev = __in6_dev_get(dev);
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struct smc_clc_ipv6_prefix *ipv6_prfx;
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struct inet6_ifaddr *ifa;
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int i, max;
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if (!in6_dev)
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return -ENODEV;
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/* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */
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ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop));
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max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX);
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list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
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if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
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continue;
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for (i = 0; i < max; i++) {
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if (ifa->prefix_len == ipv6_prfx[i].prefix_len &&
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ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix,
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ifa->prefix_len))
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return 0;
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}
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}
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#endif
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return -ENOENT;
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}
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/* check if proposed prefixes match one of our device prefixes */
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int smc_clc_prfx_match(struct socket *clcsock,
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struct smc_clc_msg_proposal_prefix *prop)
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{
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struct dst_entry *dst = sk_dst_get(clcsock->sk);
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int rc;
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if (!dst) {
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rc = -ENOTCONN;
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goto out;
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}
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if (!dst->dev) {
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rc = -ENODEV;
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goto out_rel;
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}
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rcu_read_lock();
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if (!prop->ipv6_prefixes_cnt)
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rc = smc_clc_prfx_match4_rcu(dst->dev, prop);
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else
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rc = smc_clc_prfx_match6_rcu(dst->dev, prop);
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rcu_read_unlock();
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out_rel:
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dst_release(dst);
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out:
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return rc;
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}
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|
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/* Wait for data on the tcp-socket, analyze received data
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* Returns:
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* 0 if success and it was not a decline that we received.
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* SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send.
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* clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise.
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*/
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int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
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u8 expected_type, unsigned long timeout)
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{
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long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo;
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struct sock *clc_sk = smc->clcsock->sk;
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struct smc_clc_msg_hdr *clcm = buf;
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struct msghdr msg = {NULL, 0};
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int reason_code = 0;
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struct kvec vec = {buf, buflen};
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int len, datlen, recvlen;
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bool check_trl = true;
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int krflags;
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|
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/* peek the first few bytes to determine length of data to receive
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* so we don't consume any subsequent CLC message or payload data
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* in the TCP byte stream
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*/
|
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/*
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* Caller must make sure that buflen is no less than
|
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* sizeof(struct smc_clc_msg_hdr)
|
|
*/
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krflags = MSG_PEEK | MSG_WAITALL;
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clc_sk->sk_rcvtimeo = timeout;
|
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iov_iter_kvec(&msg.msg_iter, READ, &vec, 1,
|
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sizeof(struct smc_clc_msg_hdr));
|
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len = sock_recvmsg(smc->clcsock, &msg, krflags);
|
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if (signal_pending(current)) {
|
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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;
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|
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;
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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)) {
|
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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;
|
|
struct msghdr msg;
|
|
struct kvec vec;
|
|
int len;
|
|
|
|
memset(&dclc, 0, sizeof(dclc));
|
|
memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
|
|
dclc.hdr.type = SMC_CLC_DECLINE;
|
|
dclc.hdr.length = htons(sizeof(struct smc_clc_msg_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);
|
|
memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
|
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
vec.iov_base = &dclc;
|
|
vec.iov_len = sizeof(struct smc_clc_msg_decline);
|
|
len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1,
|
|
sizeof(struct smc_clc_msg_decline));
|
|
if (len < 0 || len < sizeof(struct smc_clc_msg_decline))
|
|
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 {
|
|
u16 v2_ext_offset;
|
|
u8 *eid = NULL;
|
|
|
|
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);
|
|
v2_ext->hdr.eid_cnt = 0;
|
|
v2_ext->hdr.ism_gid_cnt = ini->ism_offered_cnt;
|
|
v2_ext->hdr.flag.release = SMC_RELEASE;
|
|
v2_ext->hdr.flag.seid = 1;
|
|
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);
|
|
if (ini->ism_dev[0])
|
|
smc_ism_get_system_eid(ini->ism_dev[0], &eid);
|
|
else
|
|
smc_ism_get_system_eid(ini->ism_dev[1], &eid);
|
|
if (eid)
|
|
memcpy(smcd_v2_ext->system_eid, eid, SMC_MAX_EID_LEN);
|
|
plen += sizeof(*v2_ext) + 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);
|
|
}
|
|
}
|
|
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);
|
|
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)
|
|
{
|
|
struct smc_connection *conn = &smc->conn;
|
|
struct smc_clc_msg_accept_confirm *clc;
|
|
struct smc_clc_first_contact_ext fce;
|
|
struct smc_clc_msg_trail trl;
|
|
struct kvec vec[3];
|
|
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_short;
|
|
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 {
|
|
u8 *eid = NULL;
|
|
|
|
clc_v2->chid = htons(smc_ism_get_chid(conn->lgr->smcd));
|
|
smc_ism_get_system_eid(conn->lgr->smcd, &eid);
|
|
if (eid)
|
|
memcpy(clc_v2->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 */
|
|
link = conn->lnk;
|
|
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_rx[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_short;
|
|
clc->r0.rmb_dma_addr = cpu_to_be64((u64)sg_dma_address
|
|
(conn->rmb_desc->sgt[link->link_idx].sgl));
|
|
hton24(clc->r0.psn, link->psn_initial);
|
|
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 = SMCD_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);
|
|
}
|
|
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)
|
|
{
|
|
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);
|
|
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)
|
|
{
|
|
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);
|
|
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)));
|
|
}
|