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; |
| 52 | msg = iofd_msgb_pending_or_alloc(iofd); |
| 53 | if (!msg) { |
| 54 | LOGP(DLIO, LOGL_ERROR, "iofd(%s): Could not get msgb for reading\n", iofd->name); |
| 55 | OSMO_ASSERT(0); |
| 56 | } |
| 57 | |
| 58 | hdr.msg = msg; |
| 59 | hdr.iov[0].iov_base = msgb_data(msg); |
| 60 | hdr.iov[0].iov_len = msgb_tailroom(msg); |
| 61 | hdr.hdr.msg_iov = &hdr.iov[0]; |
| 62 | hdr.hdr.msg_iovlen = 1; |
| 63 | hdr.hdr.msg_name = &hdr.osa.u.sa; |
Daniel Willmann | a4b958b | 2023-05-11 14:46:11 +0200 | [diff] [blame] | 64 | hdr.hdr.msg_namelen = sizeof(struct osmo_sockaddr); |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 65 | |
| 66 | rc = recvmsg(ofd->fd, &hdr.hdr, flags); |
| 67 | if (rc > 0) |
| 68 | msgb_put(msg, rc); |
| 69 | |
| 70 | switch (iofd->mode) { |
| 71 | case OSMO_IO_FD_MODE_READ_WRITE: |
| 72 | iofd_handle_segmented_read(iofd, msg, rc); |
| 73 | break; |
| 74 | case OSMO_IO_FD_MODE_RECVFROM_SENDTO: |
| 75 | iofd->io_ops.recvfrom_cb(iofd, rc, msg, &hdr.osa); |
| 76 | break; |
| 77 | case OSMO_IO_FD_MODE_SCTP_RECVMSG_SENDMSG: |
| 78 | /* TODO Implement */ |
| 79 | OSMO_ASSERT(false); |
| 80 | break; |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | if (iofd->closed) |
| 85 | return; |
| 86 | |
| 87 | if (what & OSMO_FD_WRITE) { |
| 88 | struct iofd_msghdr *msghdr = iofd_txqueue_dequeue(iofd); |
| 89 | if (msghdr) { |
| 90 | msg = msghdr->msg; |
| 91 | |
| 92 | rc = sendmsg(ofd->fd, &msghdr->hdr, msghdr->flags); |
| 93 | if (rc > 0 && rc < msgb_length(msg)) { |
| 94 | msgb_pull(msg, rc); |
| 95 | iofd_txqueue_enqueue_front(iofd, msghdr); |
| 96 | return; |
| 97 | } |
| 98 | |
| 99 | switch (iofd->mode) { |
| 100 | case OSMO_IO_FD_MODE_READ_WRITE: |
| 101 | iofd->io_ops.write_cb(iofd, rc, msg); |
| 102 | break; |
| 103 | case OSMO_IO_FD_MODE_RECVFROM_SENDTO: |
| 104 | iofd->io_ops.sendto_cb(iofd, rc, msg, &msghdr->osa); |
| 105 | break; |
| 106 | case OSMO_IO_FD_MODE_SCTP_RECVMSG_SENDMSG: |
| 107 | OSMO_ASSERT(false); |
| 108 | break; |
| 109 | } |
| 110 | |
| 111 | talloc_free(msghdr); |
| 112 | msgb_free(msg); |
Daniel Willmann | cbbd17e | 2023-05-17 17:08:10 +0200 | [diff] [blame^] | 113 | } else { |
| 114 | if (iofd->mode == OSMO_IO_FD_MODE_READ_WRITE) |
| 115 | /* Socket is writable, but we have no data to send. A non-blocking/async |
| 116 | connect() is signalled this way. */ |
| 117 | iofd->io_ops.write_cb(iofd, 0, NULL); |
| 118 | if (osmo_iofd_txqueue_len(iofd) == 0) |
| 119 | iofd_poll_ops.write_disable(iofd); |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 120 | } |
Daniel Willmann | cbbd17e | 2023-05-17 17:08:10 +0200 | [diff] [blame^] | 121 | |
Harald Welte | 8857f3b | 2022-11-18 13:54:44 +0100 | [diff] [blame] | 122 | } |
| 123 | } |
| 124 | |
| 125 | static int iofd_poll_ofd_cb_dispatch(struct osmo_fd *ofd, unsigned int what) |
| 126 | { |
| 127 | struct osmo_io_fd *iofd = ofd->data; |
| 128 | |
| 129 | iofd->in_callback = true; |
| 130 | iofd_poll_ofd_cb_recvmsg_sendmsg(ofd, what); |
| 131 | iofd->in_callback = false; |
| 132 | |
| 133 | if (iofd->to_free) { |
| 134 | talloc_free(iofd); |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | int iofd_poll_register(struct osmo_io_fd *iofd) |
| 142 | { |
| 143 | struct osmo_fd *ofd = &iofd->u.poll.ofd; |
| 144 | osmo_fd_setup(ofd, iofd->fd, 0, &iofd_poll_ofd_cb_dispatch, iofd, 0); |
| 145 | return osmo_fd_register(ofd); |
| 146 | } |
| 147 | |
| 148 | int iofd_poll_unregister(struct osmo_io_fd *iofd) |
| 149 | { |
| 150 | struct osmo_fd *ofd = &iofd->u.poll.ofd; |
| 151 | osmo_fd_unregister(ofd); |
| 152 | |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | int iofd_poll_close(struct osmo_io_fd *iofd) |
| 157 | { |
| 158 | osmo_fd_close(&iofd->u.poll.ofd); |
| 159 | |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | void iofd_poll_read_enable(struct osmo_io_fd *iofd) |
| 164 | { |
| 165 | osmo_fd_read_enable(&iofd->u.poll.ofd); |
| 166 | } |
| 167 | |
| 168 | void iofd_poll_read_disable(struct osmo_io_fd *iofd) |
| 169 | { |
| 170 | osmo_fd_read_disable(&iofd->u.poll.ofd); |
| 171 | } |
| 172 | |
| 173 | void iofd_poll_write_enable(struct osmo_io_fd *iofd) |
| 174 | { |
| 175 | osmo_fd_write_enable(&iofd->u.poll.ofd); |
| 176 | } |
| 177 | |
| 178 | void iofd_poll_write_disable(struct osmo_io_fd *iofd) |
| 179 | { |
| 180 | osmo_fd_write_disable(&iofd->u.poll.ofd); |
| 181 | } |
| 182 | |
| 183 | const struct iofd_backend_ops iofd_poll_ops = { |
| 184 | .register_fd = iofd_poll_register, |
| 185 | .unregister_fd = iofd_poll_unregister, |
| 186 | .close = iofd_poll_close, |
| 187 | .write_enable = iofd_poll_write_enable, |
| 188 | .write_disable = iofd_poll_write_disable, |
| 189 | .read_enable = iofd_poll_read_enable, |
| 190 | .read_disable = iofd_poll_read_disable, |
| 191 | }; |
| 192 | |
| 193 | #endif /* defined(__linux__) */ |