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e7b7a64a84
According to RFC7609 [1] the CLC proposal message contains an area of unknown length for future growth. Additionally it may contain up to 8 IPv6 prefixes. The current version of the SMC-code does not understand CLC proposal messages using these variable length fields and, thus, is incompatible with SMC implementations in other operating systems. This patch makes sure, SMC understands incoming CLC proposals * with arbitrary length values for future growth * with up to 8 IPv6 prefixes [1] SMC-R Informational RFC: http://www.rfc-editor.org/info/rfc7609 Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Reviewed-by: Hans Wippel <hwippel@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
340 lines
10 KiB
C
340 lines
10 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
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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/if_ether.h>
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#include <linux/sched/signal.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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/* 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)
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{
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struct smc_clc_msg_proposal_prefix *pclc_prfx;
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struct smc_clc_msg_accept_confirm *clc;
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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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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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pclc_prfx = smc_clc_proposal_get_prefix(pclc);
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if (ntohs(pclc->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(*trl))
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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 = (struct smc_clc_msg_accept_confirm *)clcm;
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if (ntohs(clc->hdr.length) != sizeof(*clc))
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return false;
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trl = &clc->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 (memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)))
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return false;
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return true;
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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)
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{
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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;
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int len, datlen;
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int krflags;
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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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vec.iov_base = buf;
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vec.iov_len = buflen;
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krflags = MSG_PEEK | MSG_WAITALL;
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smc->clcsock->sk->sk_rcvtimeo = CLC_WAIT_TIME;
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len = kernel_recvmsg(smc->clcsock, &msg, &vec, 1,
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sizeof(struct smc_clc_msg_hdr), krflags);
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if (signal_pending(current)) {
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reason_code = -EINTR;
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clc_sk->sk_err = EINTR;
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smc->sk.sk_err = EINTR;
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goto out;
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}
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if (clc_sk->sk_err) {
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reason_code = -clc_sk->sk_err;
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smc->sk.sk_err = clc_sk->sk_err;
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goto out;
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}
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if (!len) { /* peer has performed orderly shutdown */
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smc->sk.sk_err = ECONNRESET;
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reason_code = -ECONNRESET;
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goto out;
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}
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if (len < 0) {
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smc->sk.sk_err = -len;
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reason_code = len;
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goto out;
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}
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datlen = ntohs(clcm->length);
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if ((len < sizeof(struct smc_clc_msg_hdr)) ||
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(datlen > buflen) ||
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((clcm->type != SMC_CLC_DECLINE) &&
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(clcm->type != expected_type))) {
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smc->sk.sk_err = EPROTO;
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reason_code = -EPROTO;
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goto out;
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}
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/* receive the complete CLC message */
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vec.iov_base = buf;
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vec.iov_len = buflen;
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memset(&msg, 0, sizeof(struct msghdr));
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krflags = MSG_WAITALL;
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smc->clcsock->sk->sk_rcvtimeo = CLC_WAIT_TIME;
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len = kernel_recvmsg(smc->clcsock, &msg, &vec, 1, datlen, krflags);
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if (len < datlen || !smc_clc_msg_hdr_valid(clcm)) {
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smc->sk.sk_err = EPROTO;
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reason_code = -EPROTO;
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goto out;
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}
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if (clcm->type == SMC_CLC_DECLINE) {
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reason_code = SMC_CLC_DECL_REPLY;
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if (((struct smc_clc_msg_decline *)buf)->hdr.flag) {
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smc->conn.lgr->sync_err = true;
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smc_lgr_terminate(smc->conn.lgr);
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}
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}
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out:
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return reason_code;
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}
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/* send CLC DECLINE message across internal TCP socket */
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int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info)
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{
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struct smc_clc_msg_decline dclc;
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struct msghdr msg;
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struct kvec vec;
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int len;
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memset(&dclc, 0, sizeof(dclc));
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memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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dclc.hdr.type = SMC_CLC_DECLINE;
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dclc.hdr.length = htons(sizeof(struct smc_clc_msg_decline));
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dclc.hdr.version = SMC_CLC_V1;
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dclc.hdr.flag = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ? 1 : 0;
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memcpy(dclc.id_for_peer, local_systemid, sizeof(local_systemid));
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dclc.peer_diagnosis = htonl(peer_diag_info);
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memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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memset(&msg, 0, sizeof(msg));
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vec.iov_base = &dclc;
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vec.iov_len = sizeof(struct smc_clc_msg_decline);
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len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1,
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sizeof(struct smc_clc_msg_decline));
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if (len < sizeof(struct smc_clc_msg_decline))
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smc->sk.sk_err = EPROTO;
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if (len < 0)
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smc->sk.sk_err = -len;
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return sock_error(&smc->sk);
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}
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/* send CLC PROPOSAL message across internal TCP socket */
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int smc_clc_send_proposal(struct smc_sock *smc,
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struct smc_ib_device *smcibdev,
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u8 ibport)
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{
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struct smc_clc_msg_proposal_prefix pclc_prfx;
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struct smc_clc_msg_proposal pclc;
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struct smc_clc_msg_trail trl;
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int reason_code = 0;
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struct kvec vec[3];
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struct msghdr msg;
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int len, plen, rc;
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/* send SMC Proposal CLC message */
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plen = sizeof(pclc) + sizeof(pclc_prfx) + sizeof(trl);
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memset(&pclc, 0, sizeof(pclc));
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memcpy(pclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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pclc.hdr.type = SMC_CLC_PROPOSAL;
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pclc.hdr.length = htons(plen);
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pclc.hdr.version = SMC_CLC_V1; /* SMC version */
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memcpy(pclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
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memcpy(&pclc.lcl.gid, &smcibdev->gid[ibport - 1], SMC_GID_SIZE);
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memcpy(&pclc.lcl.mac, &smcibdev->mac[ibport - 1], ETH_ALEN);
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pclc.iparea_offset = htons(0);
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memset(&pclc_prfx, 0, sizeof(pclc_prfx));
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/* determine subnet and mask from internal TCP socket */
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rc = smc_netinfo_by_tcpsk(smc->clcsock, &pclc_prfx.outgoing_subnet,
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&pclc_prfx.prefix_len);
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if (rc)
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return SMC_CLC_DECL_CNFERR; /* configuration error */
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pclc_prfx.ipv6_prefixes_cnt = 0;
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memcpy(trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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memset(&msg, 0, sizeof(msg));
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vec[0].iov_base = &pclc;
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vec[0].iov_len = sizeof(pclc);
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vec[1].iov_base = &pclc_prfx;
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vec[1].iov_len = sizeof(pclc_prfx);
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vec[2].iov_base = &trl;
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vec[2].iov_len = sizeof(trl);
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/* due to the few bytes needed for clc-handshake this cannot block */
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len = kernel_sendmsg(smc->clcsock, &msg, vec, 3, plen);
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if (len < sizeof(pclc)) {
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if (len >= 0) {
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reason_code = -ENETUNREACH;
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smc->sk.sk_err = -reason_code;
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} else {
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smc->sk.sk_err = smc->clcsock->sk->sk_err;
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reason_code = -smc->sk.sk_err;
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}
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}
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return reason_code;
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}
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/* send CLC CONFIRM message across internal TCP socket */
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int smc_clc_send_confirm(struct smc_sock *smc)
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{
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struct smc_connection *conn = &smc->conn;
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struct smc_clc_msg_accept_confirm cclc;
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struct smc_link *link;
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int reason_code = 0;
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struct msghdr msg;
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struct kvec vec;
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int len;
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link = &conn->lgr->lnk[SMC_SINGLE_LINK];
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/* send SMC Confirm CLC msg */
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memset(&cclc, 0, sizeof(cclc));
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memcpy(cclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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cclc.hdr.type = SMC_CLC_CONFIRM;
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cclc.hdr.length = htons(sizeof(cclc));
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cclc.hdr.version = SMC_CLC_V1; /* SMC version */
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memcpy(cclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
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memcpy(&cclc.lcl.gid, &link->smcibdev->gid[link->ibport - 1],
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SMC_GID_SIZE);
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memcpy(&cclc.lcl.mac, &link->smcibdev->mac[link->ibport - 1], ETH_ALEN);
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hton24(cclc.qpn, link->roce_qp->qp_num);
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cclc.rmb_rkey =
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htonl(conn->rmb_desc->mr_rx[SMC_SINGLE_LINK]->rkey);
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cclc.conn_idx = 1; /* for now: 1 RMB = 1 RMBE */
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cclc.rmbe_alert_token = htonl(conn->alert_token_local);
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cclc.qp_mtu = min(link->path_mtu, link->peer_mtu);
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cclc.rmbe_size = conn->rmbe_size_short;
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cclc.rmb_dma_addr = cpu_to_be64(
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(u64)sg_dma_address(conn->rmb_desc->sgt[SMC_SINGLE_LINK].sgl));
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hton24(cclc.psn, link->psn_initial);
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memcpy(cclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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memset(&msg, 0, sizeof(msg));
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vec.iov_base = &cclc;
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vec.iov_len = sizeof(cclc);
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len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, sizeof(cclc));
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if (len < sizeof(cclc)) {
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if (len >= 0) {
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reason_code = -ENETUNREACH;
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smc->sk.sk_err = -reason_code;
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} else {
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smc->sk.sk_err = smc->clcsock->sk->sk_err;
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reason_code = -smc->sk.sk_err;
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}
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}
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return reason_code;
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}
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/* send CLC ACCEPT message across internal TCP socket */
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int smc_clc_send_accept(struct smc_sock *new_smc, int srv_first_contact)
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{
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struct smc_connection *conn = &new_smc->conn;
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struct smc_clc_msg_accept_confirm aclc;
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struct smc_link *link;
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struct msghdr msg;
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struct kvec vec;
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int rc = 0;
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int len;
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link = &conn->lgr->lnk[SMC_SINGLE_LINK];
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memset(&aclc, 0, sizeof(aclc));
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memcpy(aclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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aclc.hdr.type = SMC_CLC_ACCEPT;
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aclc.hdr.length = htons(sizeof(aclc));
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aclc.hdr.version = SMC_CLC_V1; /* SMC version */
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if (srv_first_contact)
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aclc.hdr.flag = 1;
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memcpy(aclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
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memcpy(&aclc.lcl.gid, &link->smcibdev->gid[link->ibport - 1],
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SMC_GID_SIZE);
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memcpy(&aclc.lcl.mac, link->smcibdev->mac[link->ibport - 1], ETH_ALEN);
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hton24(aclc.qpn, link->roce_qp->qp_num);
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aclc.rmb_rkey =
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htonl(conn->rmb_desc->mr_rx[SMC_SINGLE_LINK]->rkey);
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aclc.conn_idx = 1; /* as long as 1 RMB = 1 RMBE */
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aclc.rmbe_alert_token = htonl(conn->alert_token_local);
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aclc.qp_mtu = link->path_mtu;
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aclc.rmbe_size = conn->rmbe_size_short,
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aclc.rmb_dma_addr = cpu_to_be64(
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(u64)sg_dma_address(conn->rmb_desc->sgt[SMC_SINGLE_LINK].sgl));
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hton24(aclc.psn, link->psn_initial);
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memcpy(aclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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memset(&msg, 0, sizeof(msg));
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vec.iov_base = &aclc;
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vec.iov_len = sizeof(aclc);
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len = kernel_sendmsg(new_smc->clcsock, &msg, &vec, 1, sizeof(aclc));
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if (len < sizeof(aclc)) {
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if (len >= 0)
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new_smc->sk.sk_err = EPROTO;
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else
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new_smc->sk.sk_err = new_smc->clcsock->sk->sk_err;
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rc = sock_error(&new_smc->sk);
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}
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return rc;
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}
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