Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 1 | /*! \file osmo_io_poll.c |
| 2 | * New osmocom async I/O API. |
| 3 | * |
| 4 | * (C) 2022 by Harald Welte <laforge@osmocom.org> |
| 5 | * (C) 2022-2023 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de> |
| 6 | * Author: Daniel Willmann <dwillmann@sysmocom.de> |
| 7 | * |
| 8 | * All Rights Reserved. |
| 9 | * |
| 10 | * SPDX-License-Identifier: GPL-2.0+ |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | */ |
| 22 | |
| 23 | #include "../config.h" |
| 24 | #if defined(__linux__) |
| 25 | |
| 26 | #include <errno.h> |
| 27 | #include <stdio.h> |
| 28 | #include <talloc.h> |
| 29 | #include <unistd.h> |
| 30 | #include <stdbool.h> |
| 31 | #include <sys/socket.h> |
| 32 | |
| 33 | #include <osmocom/core/osmo_io.h> |
| 34 | #include <osmocom/core/linuxlist.h> |
| 35 | #include <osmocom/core/logging.h> |
| 36 | #include <osmocom/core/msgb.h> |
| 37 | #include <osmocom/core/select.h> |
| 38 | #include <osmocom/core/socket.h> |
| 39 | #include <osmocom/core/talloc.h> |
| 40 | #include <osmocom/core/utils.h> |
| 41 | |
| 42 | #include "osmo_io_internal.h" |
| 43 | |
| 44 | static void iofd_poll_ofd_cb_recvmsg_sendmsg(struct osmo_fd *ofd, unsigned int what) |
| 45 | { |
| 46 | struct osmo_io_fd *iofd = ofd->data; |
| 47 | struct msgb *msg; |
| 48 | int rc, flags = 0; |
| 49 | |
| 50 | if (what & OSMO_FD_READ) { |
| 51 | struct iofd_msghdr hdr; |
Harald Welte | 1047ed7 | 2023-11-18 18:51:58 +0100 | [diff] [blame] | 52 | |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 53 | msg = iofd_msgb_pending_or_alloc(iofd); |
| 54 | if (!msg) { |
Daniel Willmann | a8a27c2 | 2023-06-26 19:26:16 +0200 | [diff] [blame] | 55 | LOGPIO(iofd, LOGL_ERROR, "Could not allocate msgb for reading\n"); |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 56 | OSMO_ASSERT(0); |
| 57 | } |
| 58 | |
| 59 | hdr.msg = msg; |
arehbein | 5099d99 | 2023-06-16 22:37:44 +0200 | [diff] [blame] | 60 | hdr.iov[0].iov_base = msg->tail; |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 61 | hdr.iov[0].iov_len = msgb_tailroom(msg); |
Daniel Willmann | 435856b | 2023-09-05 14:11:55 +0200 | [diff] [blame] | 62 | hdr.hdr = (struct msghdr) { |
| 63 | .msg_iov = &hdr.iov[0], |
| 64 | .msg_iovlen = 1, |
| 65 | .msg_name = &hdr.osa.u.sa, |
| 66 | .msg_namelen = sizeof(struct osmo_sockaddr), |
| 67 | }; |
Harald Welte | 1047ed7 | 2023-11-18 18:51:58 +0100 | [diff] [blame] | 68 | if (iofd->mode == OSMO_IO_FD_MODE_RECVMSG_SENDMSG) { |
| 69 | hdr.hdr.msg_control = alloca(iofd->cmsg_size); |
| 70 | hdr.hdr.msg_controllen = iofd->cmsg_size; |
| 71 | } |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 72 | |
| 73 | rc = recvmsg(ofd->fd, &hdr.hdr, flags); |
| 74 | if (rc > 0) |
| 75 | msgb_put(msg, rc); |
| 76 | |
Andreas Eversberg | 76f7678 | 2024-02-14 14:33:10 +0100 | [diff] [blame] | 77 | iofd_handle_recv(iofd, msg, (rc < 0 && errno > 0) ? -errno : rc, &hdr); |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 78 | } |
| 79 | |
Daniel Willmann | f89162f | 2023-06-26 19:24:46 +0200 | [diff] [blame] | 80 | if (IOFD_FLAG_ISSET(iofd, IOFD_FLAG_CLOSED)) |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 81 | return; |
| 82 | |
| 83 | if (what & OSMO_FD_WRITE) { |
| 84 | struct iofd_msghdr *msghdr = iofd_txqueue_dequeue(iofd); |
| 85 | if (msghdr) { |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 86 | rc = sendmsg(ofd->fd, &msghdr->hdr, msghdr->flags); |
Daniel Willmann | 8461188 | 2023-11-21 10:17:00 +0100 | [diff] [blame] | 87 | iofd_handle_send_completion(iofd, rc, msghdr); |
Daniel Willmann | cbbd17e | 2023-05-17 17:08:10 +0200 | [diff] [blame] | 88 | } else { |
Harald Welte | b365b1d | 2024-02-23 16:08:49 +0100 | [diff] [blame] | 89 | /* Socket is writable, but we have no data to send. A non-blocking/async |
| 90 | connect() is signalled this way. */ |
| 91 | switch (iofd->mode) { |
| 92 | case OSMO_IO_FD_MODE_READ_WRITE: |
Daniel Willmann | cbbd17e | 2023-05-17 17:08:10 +0200 | [diff] [blame] | 93 | iofd->io_ops.write_cb(iofd, 0, NULL); |
Harald Welte | b365b1d | 2024-02-23 16:08:49 +0100 | [diff] [blame] | 94 | break; |
| 95 | case OSMO_IO_FD_MODE_RECVFROM_SENDTO: |
| 96 | iofd->io_ops.sendto_cb(iofd, 0, NULL, NULL); |
| 97 | break; |
Harald Welte | 1047ed7 | 2023-11-18 18:51:58 +0100 | [diff] [blame] | 98 | case OSMO_IO_FD_MODE_RECVMSG_SENDMSG: |
| 99 | iofd->io_ops.sendmsg_cb(iofd, 0, NULL); |
| 100 | break; |
Harald Welte | b365b1d | 2024-02-23 16:08:49 +0100 | [diff] [blame] | 101 | default: |
| 102 | break; |
| 103 | } |
Daniel Willmann | cbbd17e | 2023-05-17 17:08:10 +0200 | [diff] [blame] | 104 | if (osmo_iofd_txqueue_len(iofd) == 0) |
| 105 | iofd_poll_ops.write_disable(iofd); |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 106 | } |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 107 | } |
| 108 | } |
| 109 | |
| 110 | static int iofd_poll_ofd_cb_dispatch(struct osmo_fd *ofd, unsigned int what) |
| 111 | { |
| 112 | struct osmo_io_fd *iofd = ofd->data; |
| 113 | |
Daniel Willmann | f89162f | 2023-06-26 19:24:46 +0200 | [diff] [blame] | 114 | IOFD_FLAG_SET(iofd, IOFD_FLAG_IN_CALLBACK); |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 115 | iofd_poll_ofd_cb_recvmsg_sendmsg(ofd, what); |
Daniel Willmann | f89162f | 2023-06-26 19:24:46 +0200 | [diff] [blame] | 116 | IOFD_FLAG_UNSET(iofd, IOFD_FLAG_IN_CALLBACK); |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 117 | |
Daniel Willmann | f89162f | 2023-06-26 19:24:46 +0200 | [diff] [blame] | 118 | if (IOFD_FLAG_ISSET(iofd, IOFD_FLAG_TO_FREE)) { |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 119 | talloc_free(iofd); |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | return 0; |
| 124 | } |
| 125 | |
Andreas Eversberg | 3c0d500 | 2024-02-15 13:14:03 +0100 | [diff] [blame] | 126 | static int iofd_poll_register(struct osmo_io_fd *iofd) |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 127 | { |
| 128 | struct osmo_fd *ofd = &iofd->u.poll.ofd; |
Andreas Eversberg | 848faf9 | 2024-02-09 12:38:17 +0100 | [diff] [blame] | 129 | int rc; |
| 130 | |
| 131 | if (IOFD_FLAG_ISSET(iofd, IOFD_FLAG_FD_REGISTERED)) |
| 132 | return 0; |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 133 | osmo_fd_setup(ofd, iofd->fd, 0, &iofd_poll_ofd_cb_dispatch, iofd, 0); |
Andreas Eversberg | 848faf9 | 2024-02-09 12:38:17 +0100 | [diff] [blame] | 134 | rc = osmo_fd_register(ofd); |
| 135 | if (!rc) |
| 136 | IOFD_FLAG_SET(iofd, IOFD_FLAG_FD_REGISTERED); |
| 137 | return rc; |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 138 | } |
| 139 | |
Andreas Eversberg | 3c0d500 | 2024-02-15 13:14:03 +0100 | [diff] [blame] | 140 | static int iofd_poll_unregister(struct osmo_io_fd *iofd) |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 141 | { |
| 142 | struct osmo_fd *ofd = &iofd->u.poll.ofd; |
Andreas Eversberg | 848faf9 | 2024-02-09 12:38:17 +0100 | [diff] [blame] | 143 | |
| 144 | if (!IOFD_FLAG_ISSET(iofd, IOFD_FLAG_FD_REGISTERED)) |
| 145 | return 0; |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 146 | osmo_fd_unregister(ofd); |
Andreas Eversberg | 848faf9 | 2024-02-09 12:38:17 +0100 | [diff] [blame] | 147 | IOFD_FLAG_UNSET(iofd, IOFD_FLAG_FD_REGISTERED); |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 148 | |
| 149 | return 0; |
| 150 | } |
| 151 | |
Andreas Eversberg | 3c0d500 | 2024-02-15 13:14:03 +0100 | [diff] [blame] | 152 | static int iofd_poll_close(struct osmo_io_fd *iofd) |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 153 | { |
Andreas Eversberg | 848faf9 | 2024-02-09 12:38:17 +0100 | [diff] [blame] | 154 | iofd_poll_unregister(iofd); |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 155 | osmo_fd_close(&iofd->u.poll.ofd); |
| 156 | |
| 157 | return 0; |
| 158 | } |
| 159 | |
Andreas Eversberg | 3c0d500 | 2024-02-15 13:14:03 +0100 | [diff] [blame] | 160 | static void iofd_poll_read_enable(struct osmo_io_fd *iofd) |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 161 | { |
| 162 | osmo_fd_read_enable(&iofd->u.poll.ofd); |
| 163 | } |
| 164 | |
Andreas Eversberg | 3c0d500 | 2024-02-15 13:14:03 +0100 | [diff] [blame] | 165 | static void iofd_poll_read_disable(struct osmo_io_fd *iofd) |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 166 | { |
| 167 | osmo_fd_read_disable(&iofd->u.poll.ofd); |
| 168 | } |
| 169 | |
Andreas Eversberg | 3c0d500 | 2024-02-15 13:14:03 +0100 | [diff] [blame] | 170 | static void iofd_poll_write_enable(struct osmo_io_fd *iofd) |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 171 | { |
| 172 | osmo_fd_write_enable(&iofd->u.poll.ofd); |
| 173 | } |
| 174 | |
Andreas Eversberg | 3c0d500 | 2024-02-15 13:14:03 +0100 | [diff] [blame] | 175 | static void iofd_poll_write_disable(struct osmo_io_fd *iofd) |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 176 | { |
| 177 | osmo_fd_write_disable(&iofd->u.poll.ofd); |
| 178 | } |
| 179 | |
Andreas Eversberg | 3c0d500 | 2024-02-15 13:14:03 +0100 | [diff] [blame] | 180 | static void iofd_poll_notify_connected(struct osmo_io_fd *iofd) |
Andreas Eversberg | 848faf9 | 2024-02-09 12:38:17 +0100 | [diff] [blame] | 181 | { |
| 182 | int rc; |
| 183 | |
| 184 | rc = iofd_poll_register(iofd); |
| 185 | if (rc < 0) |
| 186 | return; |
| 187 | osmo_fd_write_enable(&iofd->u.poll.ofd); |
| 188 | } |
| 189 | |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 190 | const struct iofd_backend_ops iofd_poll_ops = { |
| 191 | .register_fd = iofd_poll_register, |
| 192 | .unregister_fd = iofd_poll_unregister, |
| 193 | .close = iofd_poll_close, |
| 194 | .write_enable = iofd_poll_write_enable, |
| 195 | .write_disable = iofd_poll_write_disable, |
| 196 | .read_enable = iofd_poll_read_enable, |
| 197 | .read_disable = iofd_poll_read_disable, |
Andreas Eversberg | 848faf9 | 2024-02-09 12:38:17 +0100 | [diff] [blame] | 198 | .notify_connected = iofd_poll_notify_connected, |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 199 | }; |
| 200 | |
| 201 | #endif /* defined(__linux__) */ |