From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/um/drivers/slirp_user.c | 125 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 125 insertions(+) create mode 100644 arch/um/drivers/slirp_user.c (limited to 'arch/um/drivers/slirp_user.c') diff --git a/arch/um/drivers/slirp_user.c b/arch/um/drivers/slirp_user.c new file mode 100644 index 000000000..8f633e2e5 --- /dev/null +++ b/arch/um/drivers/slirp_user.c @@ -0,0 +1,125 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) + */ + +#include +#include +#include +#include +#include +#include +#include "slirp.h" + +static int slirp_user_init(void *data, void *dev) +{ + struct slirp_data *pri = data; + + pri->dev = dev; + return 0; +} + +struct slirp_pre_exec_data { + int stdin_fd; + int stdout_fd; +}; + +static void slirp_pre_exec(void *arg) +{ + struct slirp_pre_exec_data *data = arg; + + if (data->stdin_fd != -1) + dup2(data->stdin_fd, 0); + if (data->stdout_fd != -1) + dup2(data->stdout_fd, 1); +} + +static int slirp_tramp(char **argv, int fd) +{ + struct slirp_pre_exec_data pe_data; + int pid; + + pe_data.stdin_fd = fd; + pe_data.stdout_fd = fd; + pid = run_helper(slirp_pre_exec, &pe_data, argv); + + return pid; +} + +static int slirp_open(void *data) +{ + struct slirp_data *pri = data; + int fds[2], pid, err; + + err = os_pipe(fds, 1, 1); + if (err) + return err; + + err = slirp_tramp(pri->argw.argv, fds[1]); + if (err < 0) { + printk(UM_KERN_ERR "slirp_tramp failed - errno = %d\n", -err); + goto out; + } + pid = err; + + pri->slave = fds[1]; + pri->slip.pos = 0; + pri->slip.esc = 0; + pri->pid = err; + + return fds[0]; +out: + close(fds[0]); + close(fds[1]); + return err; +} + +static void slirp_close(int fd, void *data) +{ + struct slirp_data *pri = data; + int err; + + close(fd); + close(pri->slave); + + pri->slave = -1; + + if (pri->pid<1) { + printk(UM_KERN_ERR "slirp_close: no child process to shut " + "down\n"); + return; + } + +#if 0 + if (kill(pri->pid, SIGHUP)<0) { + printk(UM_KERN_ERR "slirp_close: sending hangup to %d failed " + "(%d)\n", pri->pid, errno); + } +#endif + err = helper_wait(pri->pid); + if (err < 0) + return; + + pri->pid = -1; +} + +int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri) +{ + return slip_proto_read(fd, buf, len, &pri->slip); +} + +int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri) +{ + return slip_proto_write(fd, buf, len, &pri->slip); +} + +const struct net_user_info slirp_user_info = { + .init = slirp_user_init, + .open = slirp_open, + .close = slirp_close, + .remove = NULL, + .add_address = NULL, + .delete_address = NULL, + .mtu = BUF_SIZE, + .max_packet = BUF_SIZE, +}; -- cgit v1.2.3