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These test programs show the migration of a TCP connection using the passt-repair helper. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* PASST - Plug A Simple Socket Transport
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* for qemu/UNIX domain socket mode
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*
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* PASTA - Pack A Subtle Tap Abstraction
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* for network namespace/tap device mode
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*
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* doc/migration/target.c - Mock of TCP migration target, use with passt-repair
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*
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* Copyright (c) 2025 Red Hat GmbH
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* Author: Stefano Brivio <sbrivio@redhat.com>
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*/
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#include <arpa/inet.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <unistd.h>
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#include <netdb.h>
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#include <netinet/tcp.h>
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int main(int argc, char **argv)
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{
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struct sockaddr_in a = { AF_INET, htons(atoi(argv[3])), { 0 }, { 0 } };
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struct addrinfo hints = { 0, AF_UNSPEC, SOCK_STREAM, 0, 0,
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NULL, NULL, NULL };
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struct sockaddr_un a_helper = { AF_UNIX, { 0 } };
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int s, s_helper, seq;
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int8_t cmd;
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struct iovec iov = { &cmd, sizeof(cmd) };
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char buf[CMSG_SPACE(sizeof(int))];
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struct msghdr msg = { NULL, 0, &iov, 1, buf, sizeof(buf), 0 };
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struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
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struct addrinfo *r;
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(void)argc;
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strcpy(a_helper.sun_path, argv[4]);
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getaddrinfo(argv[1], argv[2], &hints, &r);
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if (argc != 7) {
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fprintf(stderr,
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"%s DST_ADDR DST_PORT SRC_PORT HELPER_PATH SSEQ RSEQ\n",
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argv[0]);
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return -1;
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}
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/* Prepare socket, bind to source port */
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s = socket(r->ai_family, SOCK_STREAM, IPPROTO_TCP);
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setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &((int){ 1 }), sizeof(int));
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bind(s, (struct sockaddr *)&a, sizeof(a));
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/* Wait for helper */
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s_helper = socket(AF_UNIX, SOCK_STREAM, 0);
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unlink(a_helper.sun_path);
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bind(s_helper, (struct sockaddr *)&a_helper, sizeof(a_helper));
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listen(s_helper, 1);
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s_helper = accept(s_helper, NULL, NULL);
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/* Set up message for helper, with socket */
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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cmsg->cmsg_len = CMSG_LEN(sizeof(int));
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memcpy(CMSG_DATA(cmsg), &s, sizeof(s));
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/* Send command to helper: turn repair mode on, wait for reply */
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cmd = TCP_REPAIR_ON;
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sendmsg(s_helper, &msg, 0);
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recv(s_helper, &((int){ 0 }), 1, 0);
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/* Set sending sequence */
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seq = TCP_SEND_QUEUE;
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setsockopt(s, SOL_TCP, TCP_REPAIR_QUEUE, &seq, sizeof(seq));
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seq = atoi(argv[5]);
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setsockopt(s, SOL_TCP, TCP_QUEUE_SEQ, &seq, sizeof(seq));
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/* Set receiving sequence */
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seq = TCP_RECV_QUEUE;
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setsockopt(s, SOL_TCP, TCP_REPAIR_QUEUE, &seq, sizeof(seq));
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seq = atoi(argv[6]);
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setsockopt(s, SOL_TCP, TCP_QUEUE_SEQ, &seq, sizeof(seq));
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/* Connect setting kernel state only, without actual SYN / handshake */
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connect(s, r->ai_addr, r->ai_addrlen);
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/* Send command to helper: turn repair mode off, wait for reply */
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cmd = TCP_REPAIR_OFF;
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sendmsg(s_helper, &msg, 0);
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recv(s_helper, &((int8_t){ 0 }), 1, 0);
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/* Terminate helper */
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close(s_helper);
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/* Send some more data */
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send(s, "after migration\n", sizeof("after migration\n"), 0);
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}
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