![Jeff Dike](/assets/img/avatar_default.png)
Reintroduce uml_kmalloc for the benefit of UML libc code. The previous tactic of declaring __kmalloc so it could be called directly from the libc side of the house turned out to be getting too intimate with slab, and it doesn't work with slob. So, the uml_kmalloc wrapper is back. It calls kmalloc or whatever that translates into, and libc code calls it. kfree is left alone since that still works, leaving a somewhat inconsistent API. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
195 lines
4.3 KiB
C
195 lines
4.3 KiB
C
/*
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
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* James Leu (jleu@mindspring.net).
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* Copyright (C) 2001 by various other people who didn't put their name here.
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* Licensed under the GPL.
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*/
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#include <stdint.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/un.h>
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#include "daemon.h"
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#include "net_user.h"
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#include "os.h"
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#include "um_malloc.h"
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#include "user.h"
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enum request_type { REQ_NEW_CONTROL };
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#define SWITCH_MAGIC 0xfeedface
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struct request_v3 {
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uint32_t magic;
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uint32_t version;
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enum request_type type;
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struct sockaddr_un sock;
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};
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static struct sockaddr_un *new_addr(void *name, int len)
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{
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struct sockaddr_un *sun;
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sun = uml_kmalloc(sizeof(struct sockaddr_un), UM_GFP_KERNEL);
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if (sun == NULL) {
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printk(UM_KERN_ERR "new_addr: allocation of sockaddr_un "
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"failed\n");
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return NULL;
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}
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sun->sun_family = AF_UNIX;
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memcpy(sun->sun_path, name, len);
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return sun;
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}
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static int connect_to_switch(struct daemon_data *pri)
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{
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struct sockaddr_un *ctl_addr = pri->ctl_addr;
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struct sockaddr_un *local_addr = pri->local_addr;
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struct sockaddr_un *sun;
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struct request_v3 req;
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int fd, n, err;
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pri->control = socket(AF_UNIX, SOCK_STREAM, 0);
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if (pri->control < 0) {
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err = -errno;
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printk(UM_KERN_ERR "daemon_open : control socket failed, "
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"errno = %d\n", -err);
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return err;
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}
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if (connect(pri->control, (struct sockaddr *) ctl_addr,
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sizeof(*ctl_addr)) < 0) {
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err = -errno;
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printk(UM_KERN_ERR "daemon_open : control connect failed, "
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"errno = %d\n", -err);
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goto out;
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}
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fd = socket(AF_UNIX, SOCK_DGRAM, 0);
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if (fd < 0) {
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err = -errno;
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printk(UM_KERN_ERR "daemon_open : data socket failed, "
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"errno = %d\n", -err);
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goto out;
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}
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if (bind(fd, (struct sockaddr *) local_addr, sizeof(*local_addr)) < 0) {
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err = -errno;
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printk(UM_KERN_ERR "daemon_open : data bind failed, "
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"errno = %d\n", -err);
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goto out_close;
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}
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sun = uml_kmalloc(sizeof(struct sockaddr_un), UM_GFP_KERNEL);
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if (sun == NULL) {
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printk(UM_KERN_ERR "new_addr: allocation of sockaddr_un "
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"failed\n");
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err = -ENOMEM;
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goto out_close;
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}
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req.magic = SWITCH_MAGIC;
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req.version = SWITCH_VERSION;
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req.type = REQ_NEW_CONTROL;
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req.sock = *local_addr;
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n = write(pri->control, &req, sizeof(req));
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if (n != sizeof(req)) {
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printk(UM_KERN_ERR "daemon_open : control setup request "
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"failed, err = %d\n", -errno);
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err = -ENOTCONN;
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goto out_free;
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}
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n = read(pri->control, sun, sizeof(*sun));
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if (n != sizeof(*sun)) {
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printk(UM_KERN_ERR "daemon_open : read of data socket failed, "
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"err = %d\n", -errno);
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err = -ENOTCONN;
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goto out_free;
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}
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pri->data_addr = sun;
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return fd;
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out_free:
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kfree(sun);
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out_close:
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close(fd);
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out:
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close(pri->control);
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return err;
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}
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static int daemon_user_init(void *data, void *dev)
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{
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struct daemon_data *pri = data;
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struct timeval tv;
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struct {
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char zero;
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int pid;
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int usecs;
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} name;
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if (!strcmp(pri->sock_type, "unix"))
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pri->ctl_addr = new_addr(pri->ctl_sock,
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strlen(pri->ctl_sock) + 1);
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name.zero = 0;
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name.pid = os_getpid();
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gettimeofday(&tv, NULL);
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name.usecs = tv.tv_usec;
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pri->local_addr = new_addr(&name, sizeof(name));
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pri->dev = dev;
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pri->fd = connect_to_switch(pri);
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if (pri->fd < 0) {
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kfree(pri->local_addr);
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pri->local_addr = NULL;
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return pri->fd;
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}
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return 0;
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}
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static int daemon_open(void *data)
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{
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struct daemon_data *pri = data;
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return pri->fd;
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}
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static void daemon_remove(void *data)
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{
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struct daemon_data *pri = data;
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close(pri->fd);
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pri->fd = -1;
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close(pri->control);
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pri->control = -1;
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kfree(pri->data_addr);
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pri->data_addr = NULL;
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kfree(pri->ctl_addr);
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pri->ctl_addr = NULL;
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kfree(pri->local_addr);
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pri->local_addr = NULL;
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}
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int daemon_user_write(int fd, void *buf, int len, struct daemon_data *pri)
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{
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struct sockaddr_un *data_addr = pri->data_addr;
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return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
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}
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const struct net_user_info daemon_user_info = {
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.init = daemon_user_init,
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.open = daemon_open,
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.close = NULL,
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.remove = daemon_remove,
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.add_address = NULL,
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.delete_address = NULL,
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.mtu = ETH_MAX_PACKET,
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.max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
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};
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