freebsd-dev/stand/common/dev_net.c
Toomas Soome 98e805b4a1 loader: net_open() should not replace f->f_devdata
net_open() does replace f_devdata with pointer to netdev_sock,
this will cause memory leak when device is closed, but also does
alter the devopen() logic.

We should store &netdev_sock to dev->d_opendata instead, this
would preserve and follow the devopen() logic.

Fixes network boot on aarch64 (tested by bz).

Reviewed-by:	imp
MFC After:	2 weeks
Differential Revision: https://reviews.freebsd.org/D32227
2021-10-19 19:43:56 +03:00

442 lines
11 KiB
C

/* $NetBSD: dev_net.c,v 1.23 2008/04/28 20:24:06 martin Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Gordon W. Ross.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*-
* This module implements a "raw device" interface suitable for
* use by the stand-alone I/O library NFS code. This interface
* does not support any "block" access, and exists only for the
* purpose of initializing the network interface, getting boot
* parameters, and performing the NFS mount.
*
* At open time, this does:
*
* find interface - netif_open()
* RARP for IP address - rarp_getipaddress()
* RPC/bootparams - callrpc(d, RPC_BOOTPARAMS, ...)
* RPC/mountd - nfs_mount(sock, ip, path)
*
* the root file handle from mountd is saved in a global
* for use by the NFS open code (NFS/lookup).
*/
#include <machine/stdarg.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <stand.h>
#include <stddef.h>
#include <string.h>
#include <net.h>
#include <netif.h>
#include <bootp.h>
#include <bootparam.h>
#include "dev_net.h"
#include "bootstrap.h"
#ifdef NETIF_DEBUG
int debug = 0;
#endif
static char *netdev_name;
static int netdev_sock = -1;
static int netdev_opens;
static int net_init(void);
static int net_open(struct open_file *, ...);
static int net_close(struct open_file *);
static void net_cleanup(void);
static int net_strategy(void *, int, daddr_t, size_t, char *, size_t *);
static int net_print(int);
static int net_getparams(int sock);
struct devsw netdev = {
"net",
DEVT_NET,
net_init,
net_strategy,
net_open,
net_close,
noioctl,
net_print,
net_cleanup
};
static struct uri_scheme {
const char *scheme;
int proto;
} uri_schemes[] = {
{ "tftp:/", NET_TFTP },
{ "nfs:/", NET_NFS },
};
static int
net_init(void)
{
return (0);
}
/*
* Called by devopen after it sets f->f_dev to our devsw entry.
* This opens the low-level device and sets dev->d_opendata.
* This is declared with variable arguments...
*/
static int
net_open(struct open_file *f, ...)
{
struct iodesc *d;
va_list args;
struct devdesc *dev;
const char *devname; /* Device part of file name (or NULL). */
int error = 0;
va_start(args, f);
dev = va_arg(args, struct devdesc *);
va_end(args);
devname = dev->d_dev->dv_name;
/* Before opening another interface, close the previous one first. */
if (netdev_sock >= 0 && strcmp(devname, netdev_name) != 0)
net_cleanup();
/* On first open, do netif open, mount, etc. */
if (netdev_opens == 0) {
/* Find network interface. */
if (netdev_sock < 0) {
netdev_sock = netif_open(dev);
if (netdev_sock < 0) {
printf("%s: netif_open() failed\n", __func__);
return (ENXIO);
}
netdev_name = strdup(devname);
#ifdef NETIF_DEBUG
if (debug)
printf("%s: netif_open() succeeded\n",
__func__);
#endif
}
/*
* If network params were not set by netif_open(), try to get
* them via bootp, rarp, etc.
*/
if (rootip.s_addr == 0) {
/* Get root IP address, and path, etc. */
error = net_getparams(netdev_sock);
if (error) {
/* getparams makes its own noise */
free(netdev_name);
netif_close(netdev_sock);
netdev_sock = -1;
return (error);
}
}
/*
* Set the variables required by the kernel's nfs_diskless
* mechanism. This is the minimum set of variables required to
* mount a root filesystem without needing to obtain additional
* info from bootp or other sources.
*/
d = socktodesc(netdev_sock);
setenv("boot.netif.hwaddr", ether_sprintf(d->myea), 1);
setenv("boot.netif.ip", inet_ntoa(myip), 1);
setenv("boot.netif.netmask", intoa(netmask), 1);
setenv("boot.netif.gateway", inet_ntoa(gateip), 1);
setenv("boot.netif.server", inet_ntoa(rootip), 1);
if (netproto == NET_TFTP) {
setenv("boot.tftproot.server", inet_ntoa(rootip), 1);
setenv("boot.tftproot.path", rootpath, 1);
} else if (netproto == NET_NFS) {
setenv("boot.nfsroot.server", inet_ntoa(rootip), 1);
setenv("boot.nfsroot.path", rootpath, 1);
}
if (intf_mtu != 0) {
char mtu[16];
snprintf(mtu, sizeof(mtu), "%u", intf_mtu);
setenv("boot.netif.mtu", mtu, 1);
}
}
netdev_opens++;
dev->d_opendata = &netdev_sock;
return (error);
}
static int
net_close(struct open_file *f)
{
struct devdesc *dev;
#ifdef NETIF_DEBUG
if (debug)
printf("%s: opens=%d\n", __func__, netdev_opens);
#endif
dev = f->f_devdata;
dev->d_opendata = NULL;
return (0);
}
static void
net_cleanup(void)
{
if (netdev_sock >= 0) {
#ifdef NETIF_DEBUG
if (debug)
printf("%s: calling netif_close()\n", __func__);
#endif
rootip.s_addr = 0;
free(netdev_name);
netif_close(netdev_sock);
netdev_sock = -1;
}
}
static int
net_strategy(void *devdata, int rw, daddr_t blk, size_t size, char *buf,
size_t *rsize)
{
return (EIO);
}
#define SUPPORT_BOOTP
/*
* Get info for NFS boot: our IP address, our hostname,
* server IP address, and our root path on the server.
* There are two ways to do this: The old, Sun way,
* and the more modern, BOOTP way. (RFC951, RFC1048)
*
* The default is to use the Sun bootparams RPC
* (because that is what the kernel will do).
* MD code can make try_bootp initialied data,
* which will override this common definition.
*/
#ifdef SUPPORT_BOOTP
int try_bootp = 1;
#endif
extern n_long ip_convertaddr(char *p);
static int
net_getparams(int sock)
{
char buf[MAXHOSTNAMELEN];
n_long rootaddr, smask;
#ifdef SUPPORT_BOOTP
/*
* Try to get boot info using BOOTP. If we succeed, then
* the server IP address, gateway, and root path will all
* be initialized. If any remain uninitialized, we will
* use RARP and RPC/bootparam (the Sun way) to get them.
*/
if (try_bootp)
bootp(sock);
if (myip.s_addr != 0)
goto exit;
#ifdef NETIF_DEBUG
if (debug)
printf("%s: BOOTP failed, trying RARP/RPC...\n", __func__);
#endif
#endif
/*
* Use RARP to get our IP address. This also sets our
* netmask to the "natural" default for our address.
*/
if (rarp_getipaddress(sock)) {
printf("%s: RARP failed\n", __func__);
return (EIO);
}
printf("%s: client addr: %s\n", __func__, inet_ntoa(myip));
/* Get our hostname, server IP address, gateway. */
if (bp_whoami(sock)) {
printf("%s: bootparam/whoami RPC failed\n", __func__);
return (EIO);
}
#ifdef NETIF_DEBUG
if (debug)
printf("%s: client name: %s\n", __func__, hostname);
#endif
/*
* Ignore the gateway from whoami (unreliable).
* Use the "gateway" parameter instead.
*/
smask = 0;
gateip.s_addr = 0;
if (bp_getfile(sock, "gateway", &gateip, buf) == 0) {
/* Got it! Parse the netmask. */
smask = ip_convertaddr(buf);
}
if (smask) {
netmask = smask;
#ifdef NETIF_DEBUG
if (debug)
printf("%s: subnet mask: %s\n", __func__,
intoa(netmask));
#endif
}
#ifdef NETIF_DEBUG
if (gateip.s_addr && debug)
printf("%s: net gateway: %s\n", __func__, inet_ntoa(gateip));
#endif
/* Get the root server and pathname. */
if (bp_getfile(sock, "root", &rootip, rootpath)) {
printf("%s: bootparam/getfile RPC failed\n", __func__);
return (EIO);
}
exit:
if ((rootaddr = net_parse_rootpath()) != INADDR_NONE)
rootip.s_addr = rootaddr;
#ifdef NETIF_DEBUG
if (debug) {
printf("%s: server addr: %s\n", __func__, inet_ntoa(rootip));
printf("%s: server path: %s\n", __func__, rootpath);
}
#endif
return (0);
}
static int
net_print(int verbose)
{
struct netif_driver *drv;
int i, d, cnt;
int ret = 0;
if (netif_drivers[0] == NULL)
return (ret);
printf("%s devices:", netdev.dv_name);
if ((ret = pager_output("\n")) != 0)
return (ret);
cnt = 0;
for (d = 0; netif_drivers[d]; d++) {
drv = netif_drivers[d];
for (i = 0; i < drv->netif_nifs; i++) {
printf("\t%s%d:", netdev.dv_name, cnt++);
if (verbose) {
printf(" (%s%d)", drv->netif_bname,
drv->netif_ifs[i].dif_unit);
}
if ((ret = pager_output("\n")) != 0)
return (ret);
}
}
return (ret);
}
/*
* Parses the rootpath if present
*
* The rootpath format can be in the form
* <scheme>://ip/path
* <scheme>:/path
*
* For compatibility with previous behaviour it also accepts as an NFS scheme
* ip:/path
* /path
*
* If an ip is set it returns it in network byte order.
* The default scheme defined in the global netproto, if not set it defaults to
* NFS.
* It leaves just the pathname in the global rootpath.
*/
uint32_t
net_parse_rootpath(void)
{
n_long addr = htonl(INADDR_NONE);
size_t i;
char ip[FNAME_SIZE];
char *ptr, *val;
netproto = NET_NONE;
for (i = 0; i < nitems(uri_schemes); i++) {
if (strncmp(rootpath, uri_schemes[i].scheme,
strlen(uri_schemes[i].scheme)) != 0)
continue;
netproto = uri_schemes[i].proto;
break;
}
ptr = rootpath;
/* Fallback for compatibility mode */
if (netproto == NET_NONE) {
netproto = NET_NFS;
(void)strsep(&ptr, ":");
if (ptr != NULL) {
addr = inet_addr(rootpath);
bcopy(ptr, rootpath, strlen(ptr) + 1);
}
} else {
ptr += strlen(uri_schemes[i].scheme);
if (*ptr == '/') {
/* we are in the form <scheme>://, we do expect an ip */
ptr++;
/*
* XXX when http will be there we will need to check for
* a port, but right now we do not need it yet
*/
val = strchr(ptr, '/');
if (val != NULL) {
snprintf(ip, sizeof(ip), "%.*s",
(int)((uintptr_t)val - (uintptr_t)ptr),
ptr);
addr = inet_addr(ip);
bcopy(val, rootpath, strlen(val) + 1);
}
} else {
ptr--;
bcopy(ptr, rootpath, strlen(ptr) + 1);
}
}
return (addr);
}