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251bfbe494
freebsd-skq/sys/nfs/bootp_subr.c
tegge 251bfbe494 Reduce kernel stack usage by not having large packets on the stack. 
Supply correct size parameter to dhcpd.
Replace some magic numbers with macro names.
Handle more than one interface.
2000-10-29 01:19:32 +00:00

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/* $FreeBSD$ */
/*
* Copyright (c) 1995 Gordon Ross, Adam Glass
* Copyright (c) 1992 Regents of the University of California.
* All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Berkeley Laboratory and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* based on:
* nfs/krpc_subr.c
* $NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $
*/
#include "opt_bootp.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sockio.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/uio.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <net/if_types.h>
#include <net/if_dl.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfsdiskless.h>
#include <nfs/krpc.h>
#include <nfs/xdr_subs.h>
#define BOOTP_MIN_LEN 300 /* Minimum size of bootp udp packet */
#ifndef BOOTP_SETTLE_DELAY
#define BOOTP_SETTLE_DELAY 3
#endif
/*
* What is the longest we will wait before re-sending a request?
* Note this is also the frequency of "RPC timeout" messages.
* The re-send loop count sup linearly to this maximum, so the
* first complaint will happen after (1+2+3+4+5)=15 seconds.
*/
#define MAX_RESEND_DELAY 5 /* seconds */
/* Definitions from RFC951 */
struct bootp_packet {
u_int8_t op;
u_int8_t htype;
u_int8_t hlen;
u_int8_t hops;
u_int32_t xid;
u_int16_t secs;
u_int16_t flags;
struct in_addr ciaddr;
struct in_addr yiaddr;
struct in_addr siaddr;
struct in_addr giaddr;
unsigned char chaddr[16];
char sname[64];
char file[128];
unsigned char vend[256];
};
struct bootpc_ifcontext {
struct bootpc_ifcontext *next;
struct bootp_packet call;
struct bootp_packet reply;
int replylen;
int overload;
struct socket *so;
struct ifreq ireq;
struct ifnet *ifp;
struct sockaddr_dl *sdl;
struct sockaddr_in myaddr;
struct sockaddr_in netmask;
struct sockaddr_in gw;
struct sockaddr_in broadcast; /* Different for each interface */
int gotgw;
int gotnetmask;
int gotrootpath;
int outstanding;
int sentmsg;
u_int32_t xid;
enum {
IF_BOOTP_UNRESOLVED,
IF_BOOTP_RESOLVED,
IF_DHCP_OFFERED,
IF_DHCP_RESOLVED,
IF_BOOTP_FAILED
} state;
};
#define TAG_MAXLEN 1024
struct bootpc_tagcontext {
char buf[TAG_MAXLEN + 1];
int overload;
int badopt;
int badtag;
int foundopt;
int taglen;
};
struct bootpc_globalcontext {
struct bootpc_ifcontext *interfaces;
struct bootpc_ifcontext *lastinterface;
u_int32_t xid;
int gotrootpath;
int gotswappath;
int gotgw;
int ifnum;
int secs;
int starttime;
struct bootp_packet reply;
int replylen;
struct bootpc_ifcontext *setswapfs;
struct bootpc_ifcontext *setrootfs;
struct bootpc_ifcontext *sethostname;
char lookup_path[24];
struct bootpc_tagcontext tmptag;
struct bootpc_tagcontext tag;
};
#define IPPORT_BOOTPC 68
#define IPPORT_BOOTPS 67
#define BOOTP_REQUEST 1
#define BOOTP_REPLY 2
/* Common tags */
#define TAG_PAD 0 /* Pad option, implicit length 1 */
#define TAG_SUBNETMASK 1 /* RFC 950 subnet mask */
#define TAG_ROUTERS 3 /* Routers (in order of preference) */
#define TAG_HOSTNAME 12 /* Client host name */
#define TAG_ROOT 17 /* Root path */
/* DHCP specific tags */
#define TAG_OVERLOAD 52 /* Option Overload */
#define TAG_MAXMSGSIZE 57 /* Maximum DHCP Message Size */
#define TAG_END 255 /* End Option (i.e. no more options) */
/* Overload values */
#define OVERLOAD_FILE 1
#define OVERLOAD_SNAME 2
/* Site specific tags: */
#define TAG_SWAP 128
#define TAG_SWAPSIZE 129
#define TAG_ROOTOPTS 130
#define TAG_SWAPOPTS 131
extern int nfs_diskless_valid;
extern struct nfsv3_diskless nfsv3_diskless;
/* mountd RPC */
static int md_mount(struct sockaddr_in *mdsin, char *path,
u_char *fhp, int *fhsizep,
struct nfs_args *args,struct proc *procp);
static int md_lookup_swap(struct sockaddr_in *mdsin,char *path,
u_char *fhp, int *fhsizep,
struct nfs_args *args,
struct proc *procp);
static int setfs(struct sockaddr_in *addr, char *path, char *p);
static int getdec(char **ptr);
static char *substr(char *a,char *b);
static void mountopts(struct nfs_args *args, char *p);
static int xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len);
static int xdr_int_decode(struct mbuf **ptr, int *iptr);
static void print_in_addr(struct in_addr addr);
static void print_sin_addr(struct sockaddr_in *addr);
static void clear_sinaddr(struct sockaddr_in *sin);
static
struct bootpc_ifcontext *allocifctx(struct bootpc_globalcontext *gctx);
static void bootpc_compose_query(struct bootpc_ifcontext *ifctx,
struct bootpc_globalcontext *gctx,
struct proc *procp);
static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
struct bootp_packet *bp, int len, int tag);
static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
unsigned char *start, int len, int tag);
#ifdef BOOTP_DEBUG
void bootpboot_p_sa(struct sockaddr *sa,struct sockaddr *ma);
void bootpboot_p_ma(struct sockaddr *ma);
void bootpboot_p_rtentry(struct rtentry *rt);
void bootpboot_p_tree(struct radix_node *rn);
void bootpboot_p_rtlist(void);
void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
void bootpboot_p_iflist(void);
#endif
static int bootpc_call(struct bootpc_globalcontext *gctx,
struct proc *procp);
static int bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
struct bootpc_globalcontext *gctx,
struct proc *procp);
static int bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
struct bootpc_globalcontext *gctx,
struct proc *procp);
static void bootpc_decode_reply(struct nfsv3_diskless *nd,
struct bootpc_ifcontext *ifctx,
struct bootpc_globalcontext *gctx);
static int bootpc_received(struct bootpc_globalcontext *gctx,
struct bootpc_ifcontext *ifctx);
void bootpc_init(void);
/*
* In order to have multiple active interfaces with address 0.0.0.0
* and be able to send data to a selected interface, we perform
* some tricks:
*
* - The 'broadcast' address is different for each interface.
*
* - We temporarily add routing pointing 255.255.255.255 to the
* selected interface broadcast address, thus the packet sent
* goes to that interface.
*/
#ifdef BOOTP_DEBUG
void
bootpboot_p_sa(struct sockaddr *sa,
struct sockaddr *ma)
{
if (sa == NULL) {
printf("(sockaddr *) <null>");
return;
}
switch (sa->sa_family) {
case AF_INET:
{
struct sockaddr_in *sin;
sin = (struct sockaddr_in *) sa;
printf("inet ");
print_sin_addr(sin);
if (ma != NULL) {
sin = (struct sockaddr_in *) ma;
printf(" mask ");
print_sin_addr(sin);
}
}
break;
case AF_LINK:
{
struct sockaddr_dl *sli;
int i;
sli = (struct sockaddr_dl *) sa;
printf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
for (i = 0; i < sli->sdl_alen; i++) {
if (i > 0)
printf(":");
printf("%x", ((unsigned char *) LLADDR(sli))[i]);
}
}
break;
default:
printf("af%d", sa->sa_family);
}
}
void
bootpboot_p_ma(struct sockaddr *ma)
{
if (ma == NULL) {
printf("<null>");
return;
}
printf("%x", *(int *)ma);
}
void
bootpboot_p_rtentry(struct rtentry *rt)
{
bootpboot_p_sa(rt_key(rt), rt_mask(rt));
printf(" ");
bootpboot_p_ma(rt->rt_genmask);
printf(" ");
bootpboot_p_sa(rt->rt_gateway, NULL);
printf(" ");
printf("flags %x", (unsigned short) rt->rt_flags);
printf(" %d", (int) rt->rt_rmx.rmx_expire);
printf(" %s%d\n", rt->rt_ifp->if_name, rt->rt_ifp->if_unit);
}
void
bootpboot_p_tree(struct radix_node *rn)
{
while (rn != NULL) {
if (rn->rn_bit < 0) {
if ((rn->rn_flags & RNF_ROOT) != 0) {
} else {
bootpboot_p_rtentry((struct rtentry *) rn);
}
rn = rn->rn_dupedkey;
} else {
bootpboot_p_tree(rn->rn_left);
bootpboot_p_tree(rn->rn_right);
return;
}
}
}
void
bootpboot_p_rtlist(void)
{
printf("Routing table:\n");
bootpboot_p_tree(rt_tables[AF_INET]->rnh_treetop);
}
void
bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
{
printf("%s%d flags %x, addr ",
ifp->if_name,
ifp->if_unit,
(unsigned short) ifp->if_flags);
print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
printf(", broadcast ");
print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
printf(", netmask ");
print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
printf("\n");
}
void
bootpboot_p_iflist(void)
{
struct ifnet *ifp;
struct ifaddr *ifa;
printf("Interface list:\n");
for (ifp = TAILQ_FIRST(&ifnet);
ifp != NULL;
ifp = TAILQ_NEXT(ifp, if_link)) {
for (ifa = TAILQ_FIRST(&ifp->if_addrhead);
ifa != NULL;
ifa = TAILQ_NEXT(ifa, ifa_link))
if (ifa->ifa_addr->sa_family == AF_INET)
bootpboot_p_if(ifp, ifa);
}
}
#endif /* defined(BOOTP_DEBUG) */
static void
clear_sinaddr(struct sockaddr_in *sin)
{
bzero(sin, sizeof(*sin));
sin->sin_len = sizeof(*sin);
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
sin->sin_port = 0;
}
static struct bootpc_ifcontext *
allocifctx(struct bootpc_globalcontext *gctx)
{
struct bootpc_ifcontext *ifctx;
ifctx = (struct bootpc_ifcontext *) malloc(sizeof(*ifctx),
M_TEMP, M_WAITOK);
if (ifctx == NULL)
panic("Failed to allocate bootp interface context structure");
bzero(ifctx, sizeof(*ifctx));
ifctx->xid = gctx->xid;
gctx->xid += 0x100;
return ifctx;
}
static int
bootpc_received(struct bootpc_globalcontext *gctx,
struct bootpc_ifcontext *ifctx)
{
/*
* Need timeout for fallback to less
* desirable alternative.
*/
/* This call used for the side effect (badopt flag) */
(void) bootpc_tag(&gctx->tmptag, &gctx->reply,
gctx->replylen,
TAG_END);
/* If packet is invalid, ignore it */
if (gctx->tmptag.badopt != 0)
return 0;
/* Ignore packet unless it gives us a root tag we didn't have */
if (ifctx->state == IF_BOOTP_RESOLVED &&
(bootpc_tag(&gctx->tmptag, &ifctx->reply,
ifctx->replylen,
TAG_ROOT) != NULL ||
bootpc_tag(&gctx->tmptag, &gctx->reply,
gctx->replylen,
TAG_ROOT) == NULL))
return 0;
bcopy(&gctx->reply,
&ifctx->reply,
gctx->replylen);
ifctx->replylen = gctx->replylen;
/* XXX: Only reset if 'perfect' response */
ifctx->state = IF_BOOTP_RESOLVED;
ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
ifctx->replylen,
TAG_ROOT) != NULL);
ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
ifctx->replylen,
TAG_ROUTERS) != NULL);
ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
ifctx->replylen,
TAG_SUBNETMASK) != NULL);
return 1;
}
static int
bootpc_call(struct bootpc_globalcontext *gctx,
struct proc *procp)
{
struct socket *so;
struct sockaddr_in *sin, dst;
struct uio auio;
struct sockopt sopt;
struct iovec aio;
int error, on, rcvflg, timo, len;
time_t atimo;
time_t rtimo;
struct timeval tv;
struct bootpc_ifcontext *ifctx;
int outstanding;
int gotrootpath;
/*
* Create socket and set its recieve timeout.
*/
error = socreate(AF_INET, &so, SOCK_DGRAM, 0, procp);
if (error != 0)
goto out;
tv.tv_sec = 1;
tv.tv_usec = 0;
bzero(&sopt, sizeof(sopt));
sopt.sopt_level = SOL_SOCKET;
sopt.sopt_name = SO_RCVTIMEO;
sopt.sopt_val = &tv;
sopt.sopt_valsize = sizeof tv;
error = sosetopt(so, &sopt);
if (error != 0)
goto out;
/*
* Enable broadcast.
*/
on = 1;
sopt.sopt_name = SO_BROADCAST;
sopt.sopt_val = &on;
sopt.sopt_valsize = sizeof on;
error = sosetopt(so, &sopt);
if (error != 0)
goto out;
/*
* Disable routing.
*/
on = 1;
sopt.sopt_name = SO_DONTROUTE;
sopt.sopt_val = &on;
sopt.sopt_valsize = sizeof on;
error = sosetopt(so, &sopt);
if (error != 0)
goto out;
/*
* Bind the local endpoint to a bootp client port.
*/
sin = &dst;
clear_sinaddr(sin);
sin->sin_port = htons(IPPORT_BOOTPC);
error = sobind(so, (struct sockaddr *)sin, procp);
if (error != 0) {
printf("bind failed\n");
goto out;
}
/*
* Setup socket address for the server.
*/
sin = &dst;
clear_sinaddr(sin);
sin->sin_addr.s_addr = INADDR_BROADCAST;
sin->sin_port = htons(IPPORT_BOOTPS);
/*
* Send it, repeatedly, until a reply is received,
* but delay each re-send by an increasing amount.
* If the delay hits the maximum, start complaining.
*/
timo = 0;
rtimo = 0;
for (;;) {
outstanding = 0;
gotrootpath = 0;
for (ifctx = gctx->interfaces;
ifctx != NULL;
ifctx = ifctx->next) {
if (ifctx->state == IF_BOOTP_RESOLVED &&
bootpc_tag(&gctx->tmptag, &ifctx->reply,
ifctx->replylen,
TAG_ROOT) != NULL)
gotrootpath = 1;
}
for (ifctx = gctx->interfaces;
ifctx != NULL;
ifctx = ifctx->next) {
ifctx->outstanding = 0;
if (ifctx->state == IF_BOOTP_RESOLVED &&
gotrootpath != 0) {
continue;
}
if (ifctx->state == IF_BOOTP_FAILED)
continue;
outstanding++;
ifctx->outstanding = 1;
/* Send BOOTP request (or re-send). */
if (ifctx->sentmsg == 0) {
printf("Sending BOOTP Query packet from "
"interface %s (%*D)\n",
ifctx->ireq.ifr_name,
ifctx->sdl->sdl_alen,
(unsigned char *) LLADDR(ifctx->sdl),
":");
ifctx->sentmsg = 1;
}
aio.iov_base = (caddr_t) &ifctx->call;
aio.iov_len = sizeof(ifctx->call);
auio.uio_iov = &aio;
auio.uio_iovcnt = 1;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_WRITE;
auio.uio_offset = 0;
auio.uio_resid = sizeof(ifctx->call);
auio.uio_procp = procp;
/* Set netmask to 0.0.0.0 */
sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
clear_sinaddr(sin);
error = ifioctl(ifctx->so, SIOCSIFNETMASK,
(caddr_t) &ifctx->ireq, procp);
if (error != 0)
panic("bootpc_call:"
"set if netmask, error=%d",
error);
error = sosend(so, (struct sockaddr *) &dst,
&auio, NULL, NULL, 0, procp);
if (error != 0) {
printf("bootpc_call: sosend: %d state %08x\n",
error, (int) so->so_state);
}
/* XXX: Is this needed ? */
tsleep(&error, PZERO + 8, "bootpw", 10);
/* Set netmask to 255.0.0.0 */
sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
clear_sinaddr(sin);
sin->sin_addr.s_addr = htonl(0xff000000u);
error = ifioctl(ifctx->so, SIOCSIFNETMASK,
(caddr_t) &ifctx->ireq, procp);
if (error != 0)
panic("bootpc_call:"
"set if netmask, error=%d",
error);
}
if (outstanding == 0 &&
(rtimo == 0 || time_second >= rtimo)) {
error = 0;
goto gotreply;
}
/* Determine new timeout. */
if (timo < MAX_RESEND_DELAY)
timo++;
else {
printf("BOOTP timeout for server ");
print_sin_addr(&dst);
printf("\n");
}
/*
* Wait for up to timo seconds for a reply.
* The socket receive timeout was set to 1 second.
*/
atimo = timo + time_second;
while (time_second < atimo) {
aio.iov_base = (caddr_t) &gctx->reply;
aio.iov_len = sizeof(gctx->reply);
auio.uio_iov = &aio;
auio.uio_iovcnt = 1;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_READ;
auio.uio_offset = 0;
auio.uio_resid = sizeof(gctx->reply);
auio.uio_procp = procp;
rcvflg = 0;
error = soreceive(so, NULL, &auio,
NULL, NULL, &rcvflg);
gctx->secs = time_second - gctx->starttime;
for (ifctx = gctx->interfaces;
ifctx != NULL;
ifctx = ifctx->next) {
if (ifctx->state == IF_BOOTP_RESOLVED)
continue;
if (ifctx->state == IF_BOOTP_FAILED)
continue;
ifctx->call.secs = htons(gctx->secs);
}
if (error == EWOULDBLOCK)
continue;
if (error != 0)
goto out;
len = sizeof(gctx->reply) - auio.uio_resid;
/* Do we have the required number of bytes ? */
if (len < BOOTP_MIN_LEN)
continue;
gctx->replylen = len;
/* Is it a reply? */
if (gctx->reply.op != BOOTP_REPLY)
continue;
/* Is this an answer to our query */
for (ifctx = gctx->interfaces;
ifctx != NULL;
ifctx = ifctx->next) {
if (gctx->reply.xid != ifctx->call.xid)
continue;
/* Same HW address size ? */
if (gctx->reply.hlen != ifctx->call.hlen)
continue;
/* Correct HW address ? */
if (bcmp(gctx->reply.chaddr,
ifctx->call.chaddr,
ifctx->call.hlen) != 0)
continue;
break;
}
if (ifctx != NULL) {
printf("Received BOOTP Reply packet"
" on %s from ",
ifctx->ireq.ifr_name);
print_in_addr(gctx->reply.siaddr);
if (gctx->reply.giaddr.s_addr !=
htonl(INADDR_ANY)) {
printf(" via ");
print_in_addr(gctx->reply.giaddr);
}
if (bootpc_received(gctx, ifctx) != 0) {
printf(" (accepted)");
if (ifctx->outstanding) {
ifctx->outstanding = 0;
outstanding--;
}
/* Network settle delay */
if (outstanding == 0)
atimo = time_second +
BOOTP_SETTLE_DELAY;
} else
printf(" (ignored)");
if (ifctx->gotrootpath) {
gotrootpath = 1;
rtimo = time_second +
BOOTP_SETTLE_DELAY;
printf(" (got root path)");
} else
printf(" (no root path)");
printf("\n");
}
} /* while secs */
#ifdef BOOTP_TIMEOUT
if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
break;
#endif
if (gotrootpath != 0) {
gctx->gotrootpath = gotrootpath;
if (rtimo != 0 && time_second >= rtimo)
break;
}
} /* forever send/receive */
/*
* XXX: These are errors of varying seriousness being silently
* ignored
*/
for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
if (ifctx->state != IF_BOOTP_RESOLVED) {
printf("BOOTP timeout for interface %s\n",
ifctx->ireq.ifr_name);
}
}
if (gctx->gotrootpath != 0) {
#if 0
printf("Got a root path, ignoring remaining timeout\n");
#endif
error = 0;
goto out;
}
#ifndef BOOTP_NFSROOT
for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
if (ifctx->state == IF_BOOTP_RESOLVED) {
error = 0;
goto out;
}
}
#endif
error = ETIMEDOUT;
goto out;
gotreply:
out:
soclose(so);
return error;
}
static int
bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
struct bootpc_globalcontext *gctx,
struct proc *procp)
{
struct sockaddr_in *sin;
int error;
struct ifreq *ireq;
struct socket *so;
struct ifaddr *ifa;
struct sockaddr_dl *sdl;
error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, procp);
if (error != 0)
panic("nfs_boot: socreate, error=%d", error);
ireq = &ifctx->ireq;
so = ifctx->so;
/*
* Bring up the interface.
*
* Get the old interface flags and or IFF_UP into them; if
* IFF_UP set blindly, interface selection can be clobbered.
*/
error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, procp);
if (error != 0)
panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
ireq->ifr_flags |= IFF_UP;
error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, procp);
if (error != 0)
panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
/*
* Do enough of ifconfig(8) so that the chosen interface
* can talk to the servers. (just set the address)
*/
/* addr is 0.0.0.0 */
sin = (struct sockaddr_in *) &ireq->ifr_addr;
clear_sinaddr(sin);
error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, procp);
if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
panic("bootpc_fakeup_interface: "
"set if addr, error=%d", error);
/* netmask is 255.0.0.0 */
sin = (struct sockaddr_in *) &ireq->ifr_addr;
clear_sinaddr(sin);
sin->sin_addr.s_addr = htonl(0xff000000u);
error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, procp);
if (error != 0)
panic("bootpc_fakeup_interface: set if netmask, error=%d",
error);
/* Broadcast is 255.255.255.255 */
sin = (struct sockaddr_in *)&ireq->ifr_addr;
clear_sinaddr(sin);
clear_sinaddr(&ifctx->broadcast);
sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, procp);
if (error != 0)
panic("bootpc_fakeup_interface: "
"set if broadcast addr, error=%d",
error);
/* Get HW address */
sdl = NULL;
for (ifa = TAILQ_FIRST(&ifctx->ifp->if_addrhead);
ifa != NULL;
ifa = TAILQ_NEXT(ifa,ifa_link))
if (ifa->ifa_addr->sa_family == AF_LINK &&
(sdl = ((struct sockaddr_dl *) ifa->ifa_addr)) != NULL &&
sdl->sdl_type == IFT_ETHER)
break;
if (sdl == NULL)
panic("bootpc: Unable to find HW address for %s",
ifctx->ireq.ifr_name);
ifctx->sdl = sdl;
return error;
}
static int
bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
struct bootpc_globalcontext *gctx,
struct proc *procp)
{
int error;
struct sockaddr_in defdst;
struct sockaddr_in defmask;
struct sockaddr_in *sin;
struct ifreq *ireq;
struct socket *so;
struct sockaddr_in *myaddr;
struct sockaddr_in *netmask;
struct sockaddr_in *gw;
ireq = &ifctx->ireq;
so = ifctx->so;
myaddr = &ifctx->myaddr;
netmask = &ifctx->netmask;
gw = &ifctx->gw;
if (ifctx->state != IF_BOOTP_RESOLVED) {
/* Shutdown interfaces where BOOTP failed */
printf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, procp);
if (error != 0)
panic("bootpc_adjust_interface: "
"SIOCGIFFLAGS, error=%d", error);
ireq->ifr_flags &= ~IFF_UP;
error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, procp);
if (error != 0)
panic("bootpc_adjust_interface: "
"SIOCSIFFLAGS, error=%d", error);
sin = (struct sockaddr_in *) &ireq->ifr_addr;
clear_sinaddr(sin);
error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, procp);
if (error != 0 && (error != EEXIST ||
ifctx == gctx->interfaces))
panic("bootpc_adjust_interface: "
"SIOCDIFADDR, error=%d", error);
return 0;
}
printf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
/*
* Do enough of ifconfig(8) so that the chosen interface
* can talk to the servers. (just set the address)
*/
bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, procp);
if (error != 0)
panic("bootpc_adjust_interface: "
"set if netmask, error=%d", error);
/* Broadcast is with host part of IP address all 1's */
sin = (struct sockaddr_in *) &ireq->ifr_addr;
clear_sinaddr(sin);
sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
~ netmask->sin_addr.s_addr;
error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, procp);
if (error != 0)
panic("bootpc_adjust_interface: "
"set if broadcast addr, error=%d", error);
bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, procp);
if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
panic("bootpc_adjust_interface: "
"set if addr, error=%d", error);
/* Add new default route */
if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
clear_sinaddr(&defdst);
clear_sinaddr(&defmask);
error = rtrequest(RTM_ADD,
(struct sockaddr *) &defdst,
(struct sockaddr *) gw,
(struct sockaddr *) &defmask,
(RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL);
if (error != 0) {
printf("bootpc_adjust_interface: "
"add net route, error=%d\n", error);
return error;
}
}
return 0;
}
static int
setfs(struct sockaddr_in *addr, char *path, char *p)
{
unsigned int ip;
int val;
ip = 0;
if (((val = getdec(&p)) < 0) || (val > 255))
return 0;
ip = val << 24;
if (*p != '.')
return 0;
p++;
if (((val = getdec(&p)) < 0) || (val > 255))
return 0;
ip |= (val << 16);
if (*p != '.')
return 0;
p++;
if (((val = getdec(&p)) < 0) || (val > 255))
return 0;
ip |= (val << 8);
if (*p != '.')
return 0;
p++;
if (((val = getdec(&p)) < 0) || (val > 255))
return 0;
ip |= val;
if (*p != ':')
return 0;
p++;
addr->sin_addr.s_addr = htonl(ip);
addr->sin_len = sizeof(struct sockaddr_in);
addr->sin_family = AF_INET;
strncpy(path, p, MNAMELEN - 1);
return 1;
}
static int
getdec(char **ptr)
{
char *p;
int ret;
p = *ptr;
ret = 0;
if ((*p < '0') || (*p > '9'))
return -1;
while ((*p >= '0') && (*p <= '9')) {
ret = ret * 10 + (*p - '0');
p++;
}
*ptr = p;
return ret;
}
static char *
substr(char *a, char *b)
{
char *loc1;
char *loc2;
while (*a != '\0') {
loc1 = a;
loc2 = b;
while (*loc1 == *loc2++) {
if (*loc1 == '\0')
return 0;
loc1++;
if (*loc2 == '\0')
return loc1;
}
a++;
}
return 0;
}
static void
mountopts(struct nfs_args *args, char *p)
{
char *tmp;
args->version = NFS_ARGSVERSION;
args->rsize = 8192;
args->wsize = 8192;
args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT;
args->sotype = SOCK_DGRAM;
if (p == NULL)
return;
if ((tmp = (char *)substr(p, "rsize=")))
args->rsize = getdec(&tmp);
if ((tmp = (char *)substr(p, "wsize=")))
args->wsize = getdec(&tmp);
if ((tmp = (char *)substr(p, "intr")))
args->flags |= NFSMNT_INT;
if ((tmp = (char *)substr(p, "soft")))
args->flags |= NFSMNT_SOFT;
if ((tmp = (char *)substr(p, "noconn")))
args->flags |= NFSMNT_NOCONN;
if ((tmp = (char *)substr(p, "tcp")))
args->sotype = SOCK_STREAM;
}
static int
xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len)
{
struct mbuf *m;
int alignedlen;
m = *mptr;
alignedlen = ( len + 3 ) & ~3;
if (m->m_len < alignedlen) {
m = m_pullup(m, alignedlen);
if (m == NULL) {
*mptr = NULL;
return EBADRPC;
}
}
bcopy(mtod(m, u_char *), buf, len);
m_adj(m, alignedlen);
*mptr = m;
return 0;
}
static int
xdr_int_decode(struct mbuf **mptr, int *iptr)
{
u_int32_t i;
if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0)
return EBADRPC;
*iptr = fxdr_unsigned(u_int32_t, i);
return 0;
}
static void
print_sin_addr(struct sockaddr_in *sin)
{
print_in_addr(sin->sin_addr);
}
static void
print_in_addr(struct in_addr addr)
{
unsigned int ip;
ip = ntohl(addr.s_addr);
printf("%d.%d.%d.%d",
ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
}
static void
bootpc_compose_query(ifctx, gctx, procp)
struct bootpc_ifcontext *ifctx;
struct bootpc_globalcontext *gctx;
struct proc *procp;
{
gctx->gotrootpath = 0;
gctx->gotswappath = 0;
gctx->gotgw = 0;
ifctx->gotrootpath = 0;
bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
/* bootpc part */
ifctx->call.op = BOOTP_REQUEST; /* BOOTREQUEST */
ifctx->call.htype = 1; /* 10mb ethernet */
ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
ifctx->call.hops = 0;
ifctx->xid++;
ifctx->call.xid = txdr_unsigned(ifctx->xid);
bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
ifctx->call.vend[0] = 99; /* RFC1048 cookie */
ifctx->call.vend[1] = 130;
ifctx->call.vend[2] = 83;
ifctx->call.vend[3] = 99;
ifctx->call.vend[4] = TAG_MAXMSGSIZE;
ifctx->call.vend[5] = 2;
ifctx->call.vend[6] = (sizeof(struct bootp_packet) >> 8) & 255;
ifctx->call.vend[7] = sizeof(struct bootp_packet) & 255;
ifctx->call.vend[8] = TAG_END;
ifctx->call.secs = 0;
ifctx->call.flags = htons(0x8000); /* We need an broadcast answer */
}
static int
bootpc_hascookie(struct bootp_packet *bp)
{
return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
bp->vend[2] == 83 && bp->vend[3] == 99);
}
static void
bootpc_tag_helper(struct bootpc_tagcontext *tctx,
unsigned char *start,
int len,
int tag)
{
unsigned char *j;
unsigned char *ej;
unsigned char code;
if (tctx->badtag != 0 || tctx->badopt != 0)
return;
j = start;
ej = j + len;
while (j < ej) {
code = *j++;
if (code == TAG_PAD)
continue;
if (code == TAG_END)
return;
if (j >= ej || j + *j + 1 > ej) {
tctx->badopt = 1;
return;
}
len = *j++;
if (code == tag) {
if (tctx->taglen + len > TAG_MAXLEN) {
tctx->badtag = 1;
return;
}
tctx->foundopt = 1;
if (len > 0)
memcpy(tctx->buf + tctx->taglen,
j, len);
tctx->taglen += len;
}
if (code == TAG_OVERLOAD)
tctx->overload = *j;
j += len;
}
}
static unsigned char *
bootpc_tag(struct bootpc_tagcontext *tctx,
struct bootp_packet *bp,
int len,
int tag)
{
unsigned char *j;
unsigned char *ej;
tctx->overload = 0;
tctx->badopt = 0;
tctx->badtag = 0;
tctx->foundopt = 0;
tctx->taglen = 0;
if (bootpc_hascookie(bp) == 0)
return NULL;
j = &bp->vend[4];
ej = (unsigned char *) bp + len;
bootpc_tag_helper(tctx, &bp->vend[4],
(unsigned char *) bp + len - &bp->vend[4], tag);
if ((tctx->overload & OVERLOAD_FILE) != 0)
bootpc_tag_helper(tctx,
(unsigned char *) bp->file,
sizeof(bp->file),
tag);
if ((tctx->overload & OVERLOAD_SNAME) != 0)
bootpc_tag_helper(tctx,
(unsigned char *) bp->sname,
sizeof(bp->sname),
tag);
if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
return NULL;
tctx->buf[tctx->taglen] = '\0';
return tctx->buf;
}
static void
bootpc_decode_reply(nd, ifctx, gctx)
struct nfsv3_diskless *nd;
struct bootpc_ifcontext *ifctx;
struct bootpc_globalcontext *gctx;
{
char *p;
unsigned int ip;
ifctx->gotgw = 0;
ifctx->gotnetmask = 0;
clear_sinaddr(&ifctx->myaddr);
clear_sinaddr(&ifctx->netmask);
clear_sinaddr(&ifctx->gw);
ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
snprintf(gctx->lookup_path, sizeof(gctx->lookup_path),
"swap.%d.%d.%d.%d",
ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
printf("%s at ", ifctx->ireq.ifr_name);
print_sin_addr(&ifctx->myaddr);
printf(" server ");
print_in_addr(ifctx->reply.siaddr);
ifctx->gw.sin_addr = ifctx->reply.giaddr;
if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
printf(" via gateway ");
print_in_addr(ifctx->reply.giaddr);
}
/* This call used for the side effect (overload flag) */
(void) bootpc_tag(&gctx->tmptag,
&ifctx->reply, ifctx->replylen, TAG_END);
if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
if (ifctx->reply.sname[0] != '\0')
printf(" server name %s", ifctx->reply.sname);
if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
if (ifctx->reply.file[0] != '\0')
printf(" boot file %s", ifctx->reply.file);
printf("\n");
p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
TAG_SUBNETMASK);
if (p != NULL) {
if (gctx->tag.taglen != 4)
panic("bootpc: subnet mask len is %d",
gctx->tag.taglen);
bcopy(p, &ifctx->netmask.sin_addr, 4);
ifctx->gotnetmask = 1;
printf("subnet mask ");
print_sin_addr(&ifctx->netmask);
printf(" ");
}
p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
TAG_ROUTERS);
if (p != NULL) {
/* Routers */
if (gctx->tag.taglen % 4)
panic("bootpc: Router Len is %d", gctx->tag.taglen);
if (gctx->tag.taglen > 0) {
bcopy(p, &ifctx->gw.sin_addr, 4);
printf("router ");
print_sin_addr(&ifctx->gw);
printf(" ");
ifctx->gotgw = 1;
gctx->gotgw = 1;
}
}
p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
TAG_ROOT);
if (p != NULL) {
if (gctx->setrootfs != NULL) {
printf("rootfs %s (ignored) ", p);
} else if (setfs(&nd->root_saddr,
nd->root_hostnam, p)) {
printf("rootfs %s ",p);
gctx->gotrootpath = 1;
ifctx->gotrootpath = 1;
gctx->setrootfs = ifctx;
p = bootpc_tag(&gctx->tag, &ifctx->reply,
ifctx->replylen,
TAG_ROOTOPTS);
if (p != NULL) {
mountopts(&nd->root_args, p);
printf("rootopts %s ", p);
}
} else
panic("Failed to set rootfs to %s",p);
}
p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
TAG_SWAP);
if (p != NULL) {
if (gctx->setswapfs != NULL) {
printf("swapfs %s (ignored) ", p);
} else if (setfs(&nd->swap_saddr,
nd->swap_hostnam, p)) {
gctx->gotswappath = 1;
gctx->setswapfs = ifctx;
printf("swapfs %s ", p);
p = bootpc_tag(&gctx->tag, &ifctx->reply,
ifctx->replylen,
TAG_SWAPOPTS);
if (p != NULL) {
/* swap mount options */
mountopts(&nd->swap_args, p);
printf("swapopts %s ", p);
}
p = bootpc_tag(&gctx->tag, &ifctx->reply,
ifctx->replylen,
TAG_SWAPSIZE);
if (p != NULL) {
int swaplen;
if (gctx->tag.taglen != 4)
panic("bootpc: "
"Expected 4 bytes for swaplen, "
"not %d bytes",
gctx->tag.taglen);
bcopy(p, &swaplen, 4);
nd->swap_nblks = ntohl(swaplen);
printf("swapsize %d KB ",
nd->swap_nblks);
}
} else
panic("Failed to set swapfs to %s", p);
}
p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
TAG_HOSTNAME);
if (p != NULL) {
if (gctx->tag.taglen >= MAXHOSTNAMELEN)
panic("bootpc: hostname >= %d bytes",
MAXHOSTNAMELEN);
if (gctx->sethostname != NULL) {
printf("hostname %s (ignored) ", p);
} else {
strcpy(nd->my_hostnam, p);
strcpy(hostname, p);
printf("hostname %s ",hostname);
gctx->sethostname = ifctx;
}
}
printf("\n");
if (ifctx->gotnetmask == 0) {
if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
else
ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
}
if (ifctx->gotgw == 0) {
/* Use proxyarp */
ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
}
}
void
bootpc_init(void)
{
struct bootpc_ifcontext *ifctx, *nctx; /* Interface BOOTP contexts */
struct bootpc_globalcontext *gctx; /* Global BOOTP context */
struct ifnet *ifp;
int error;
struct nfsv3_diskless *nd;
struct proc *procp;
nd = &nfsv3_diskless;
procp = curproc;
/*
* If already filled in, don't touch it here
*/
if (nfs_diskless_valid != 0)
return;
/*
* Wait until arp entries can be handled.
*/
while (time_second == 0)
tsleep(&time_second, PZERO + 8, "arpkludge", 10);
gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK);
if (gctx == NULL)
panic("Failed to allocate bootp global context structure");
bzero(gctx, sizeof(*gctx));
gctx->xid = ~0xFFFF;
gctx->starttime = time_second;
ifctx = allocifctx(gctx);
/*
* Find a network interface.
*/
#ifdef BOOTP_WIRED_TO
printf("bootpc_init: wired to interface '%s'\n",
__XSTRING(BOOTP_WIRED_TO));
#endif
bzero(&ifctx->ireq, sizeof(ifctx->ireq));
for (ifp = TAILQ_FIRST(&ifnet);
ifp != NULL;
ifp = TAILQ_NEXT(ifp, if_link)) {
snprintf(ifctx->ireq.ifr_name, sizeof(ifctx->ireq.ifr_name),
"%s%d", ifp->if_name, ifp->if_unit);
#ifdef BOOTP_WIRED_TO
if (strcmp(ifctx->ireq.ifr_name,
__XSTRING(BOOTP_WIRED_TO)) != 0)
continue;
#else
if ((ifp->if_flags &
(IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
IFF_BROADCAST)
continue;
#endif
if (gctx->interfaces != NULL)
gctx->lastinterface->next = ifctx;
else
gctx->interfaces = ifctx;
ifctx->ifp = ifp;
gctx->lastinterface = ifctx;
ifctx = allocifctx(gctx);
}
free(ifctx, M_TEMP);
if (gctx->interfaces == NULL) {
#ifdef BOOTP_WIRED_TO
panic("bootpc_init: Could not find interface specified "
"by BOOTP_WIRED_TO: "
__XSTRING(BOOTP_WIRED_TO));
#else
panic("bootpc_init: no suitable interface");
#endif
}
for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
bootpc_fakeup_interface(ifctx, gctx, procp);
for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
bootpc_compose_query(ifctx, gctx, procp);
ifctx = gctx->interfaces;
error = bootpc_call(gctx, procp);
if (error != 0) {
#ifdef BOOTP_NFSROOT
panic("BOOTP call failed");
#else
printf("BOOTP call failed\n");
#endif
}
mountopts(&nd->root_args, NULL);
mountopts(&nd->swap_args, NULL);
for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
if (ifctx->state == IF_BOOTP_RESOLVED)
bootpc_decode_reply(nd, ifctx, gctx);
if (gctx->gotswappath == 0)
nd->swap_nblks = 0;
#ifdef BOOTP_NFSROOT
if (gctx->gotrootpath == 0)
panic("bootpc: No root path offered");
#endif
for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
bootpc_adjust_interface(ifctx, gctx, procp);
soclose(ifctx->so);
}
for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
if (ifctx->gotrootpath != 0)
break;
if (ifctx == NULL) {
for (ifctx = gctx->interfaces;
ifctx != NULL;
ifctx = ifctx->next)
if (ifctx->state == IF_BOOTP_RESOLVED)
break;
}
if (ifctx == NULL)
goto out;
if (gctx->gotrootpath != 0) {
error = md_mount(&nd->root_saddr, nd->root_hostnam,
nd->root_fh, &nd->root_fhsize,
&nd->root_args, procp);
if (error != 0)
panic("nfs_boot: mountd root, error=%d", error);
if (gctx->gotswappath != 0) {
error = md_mount(&nd->swap_saddr,
nd->swap_hostnam,
nd->swap_fh, &nd->swap_fhsize,
&nd->swap_args, procp);
if (error != 0)
panic("nfs_boot: mountd swap, error=%d",
error);
error = md_lookup_swap(&nd->swap_saddr,
gctx->lookup_path,
nd->swap_fh, &nd->swap_fhsize,
&nd->swap_args, procp);
if (error != 0)
panic("nfs_boot: lookup swap, error=%d",
error);
}
nfs_diskless_valid = 3;
}
strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
ifctx->myaddr.sin_addr.s_addr |
~ ifctx->netmask.sin_addr.s_addr;
bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
out:
for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
nctx = ifctx->next;
free(ifctx, M_TEMP);
}
free(gctx, M_TEMP);
}
/*
* RPC: mountd/mount
* Given a server pathname, get an NFS file handle.
* Also, sets sin->sin_port to the NFS service port.
*/
static int
md_mount(struct sockaddr_in *mdsin, /* mountd server address */
char *path,
u_char *fhp,
int *fhsizep,
struct nfs_args *args,
struct proc *procp)
{
struct mbuf *m;
int error;
int authunixok;
int authcount;
int authver;
#ifdef BOOTP_NFSV3
/* First try NFS v3 */
/* Get port number for MOUNTD. */
error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3,
&mdsin->sin_port, procp);
if (error == 0) {
m = xdr_string_encode(path, strlen(path));
/* Do RPC to mountd. */
error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3,
RPCMNT_MOUNT, &m, NULL, procp);
}
if (error == 0) {
args->flags |= NFSMNT_NFSV3;
} else {
#endif
/* Fallback to NFS v2 */
/* Get port number for MOUNTD. */
error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1,
&mdsin->sin_port, procp);
if (error != 0)
return error;
m = xdr_string_encode(path, strlen(path));
/* Do RPC to mountd. */
error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1,
RPCMNT_MOUNT, &m, NULL, procp);
if (error != 0)
return error; /* message already freed */
#ifdef BOOTP_NFSV3
}
#endif
if (xdr_int_decode(&m, &error) != 0 || error != 0)
goto bad;
if ((args->flags & NFSMNT_NFSV3) != 0) {
if (xdr_int_decode(&m, fhsizep) != 0 ||
*fhsizep > NFSX_V3FHMAX ||
*fhsizep <= 0)
goto bad;
} else
*fhsizep = NFSX_V2FH;
if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0)
goto bad;
if (args->flags & NFSMNT_NFSV3) {
if (xdr_int_decode(&m, &authcount) != 0)
goto bad;
authunixok = 0;
if (authcount < 0 || authcount > 100)
goto bad;
while (authcount > 0) {
if (xdr_int_decode(&m, &authver) != 0)
goto bad;
if (authver == RPCAUTH_UNIX)
authunixok = 1;
authcount--;
}
if (authunixok == 0)
goto bad;
}
/* Set port number for NFS use. */
error = krpc_portmap(mdsin, NFS_PROG,
(args->flags &
NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2,
&mdsin->sin_port, procp);
goto out;
bad:
error = EBADRPC;
out:
m_freem(m);
return error;
}
static int
md_lookup_swap(struct sockaddr_in *mdsin, /* mountd server address */
char *path,
u_char *fhp,
int *fhsizep,
struct nfs_args *args,
struct proc *procp)
{
struct mbuf *m;
int error;
int size = -1;
int attribs_present;
int status;
union {
u_int32_t v2[17];
u_int32_t v3[21];
} fattribs;
m = m_get(M_WAIT,MT_DATA);
if (m == NULL)
return ENOBUFS;
if ((args->flags & NFSMNT_NFSV3) != 0) {
*mtod(m, u_int32_t *) = txdr_unsigned(*fhsizep);
bcopy(fhp, mtod(m, u_char *) + sizeof(u_int32_t), *fhsizep);
m->m_len = *fhsizep + sizeof(u_int32_t);
} else {
bcopy(fhp, mtod(m, u_char *), NFSX_V2FH);
m->m_len = NFSX_V2FH;
}
m->m_next = xdr_string_encode(path, strlen(path));
if (m->m_next == NULL) {
error = ENOBUFS;
goto out;
}
/* Do RPC to nfsd. */
if ((args->flags & NFSMNT_NFSV3) != 0)
error = krpc_call(mdsin, NFS_PROG, NFS_VER3,
NFSPROC_LOOKUP, &m, NULL, procp);
else
error = krpc_call(mdsin, NFS_PROG, NFS_VER2,
NFSV2PROC_LOOKUP, &m, NULL, procp);
if (error != 0)
return error; /* message already freed */
if (xdr_int_decode(&m, &status) != 0)
goto bad;
if (status != 0) {
error = ENOENT;
goto out;
}
if ((args->flags & NFSMNT_NFSV3) != 0) {
if (xdr_int_decode(&m, fhsizep) != 0 ||
*fhsizep > NFSX_V3FHMAX ||
*fhsizep <= 0)
goto bad;
} else
*fhsizep = NFSX_V2FH;
if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0)
goto bad;
if ((args->flags & NFSMNT_NFSV3) != 0) {
if (xdr_int_decode(&m, &attribs_present) != 0)
goto bad;
if (attribs_present != 0) {
if (xdr_opaque_decode(&m, (u_char *) &fattribs.v3,
sizeof(u_int32_t) * 21) != 0)
goto bad;
size = fxdr_unsigned(u_int32_t, fattribs.v3[6]);
}
} else {
if (xdr_opaque_decode(&m,(u_char *) &fattribs.v2,
sizeof(u_int32_t) * 17) != 0)
goto bad;
size = fxdr_unsigned(u_int32_t, fattribs.v2[5]);
}
if (nfsv3_diskless.swap_nblks == 0 && size != -1) {
nfsv3_diskless.swap_nblks = size / 1024;
printf("md_lookup_swap: Swap size is %d KB\n",
nfsv3_diskless.swap_nblks);
}
goto out;
bad:
error = EBADRPC;
out:
m_freem(m);
return error;
}
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