/* $OpenBSD: nfs_boot.c,v 1.26 2010/04/03 20:03:38 krw Exp $ */ /* $NetBSD: nfs_boot.c,v 1.26 1996/05/07 02:51:25 thorpej Exp $ */ /* * Copyright (c) 1995 Adam Glass, Gordon Ross * All rights reserved. * * 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. The name of the authors may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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/param.h> #include <sys/systm.h> #include <sys/kernel.h> #include <sys/conf.h> #include <sys/ioctl.h> #include <sys/proc.h> #include <sys/mount.h> #include <sys/mbuf.h> #include <sys/reboot.h> #include <sys/socket.h> #include <sys/socketvar.h> #include <sys/queue.h> #include <net/if.h> #include <net/route.h> #include <netinet/in.h> #include <netinet/if_ether.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> #include <nfs/nfs_var.h> #include "ether.h" #if !defined(NFSCLIENT) || (NETHER == 0 && NFDDI == 0) int nfs_boot_init(struct nfs_diskless *nd, struct proc *procp) { panic("nfs_boot_init: NFSCLIENT not enabled in kernel"); } int nfs_boot_getfh(struct sockaddr_in *bpsin, char *key, struct nfs_dlmount *ndmntp, int retries) { /* can not get here */ return (EOPNOTSUPP); } #else /* * Support for NFS diskless booting, specifically getting information * about where to boot from, what pathnames, etc. * * This implementation uses RARP and the bootparam RPC. * We are forced to implement RPC anyway (to get file handles) * so we might as well take advantage of it for bootparam too. * * The diskless boot sequence goes as follows: * (1) Use RARP to get our interface address * (2) Use RPC/bootparam/whoami to get our hostname, * our IP address, and the server's IP address. * (3) Use RPC/bootparam/getfile to get the root path * (4) Use RPC/mountd to get the root file handle * (5) Use RPC/bootparam/getfile to get the swap path * (6) Use RPC/mountd to get the swap file handle * * (This happens to be the way Sun does it too.) */ /* bootparam RPC */ static int bp_whoami(struct sockaddr_in *bpsin, struct in_addr *my_ip, struct in_addr *gw_ip); static int bp_getfile(struct sockaddr_in *bpsin, char *key, struct sockaddr_in *mdsin, char *servname, char *path, int retries); /* mountd RPC */ static int md_mount(struct sockaddr_in *mdsin, char *path, u_char *fh); char *nfsbootdevname; /* * Called with an empty nfs_diskless struct to be filled in. */ int nfs_boot_init(struct nfs_diskless *nd, struct proc *procp) { struct ifreq ireq; struct in_addr my_ip, gw_ip; struct sockaddr_in bp_sin; struct sockaddr_in *sin; struct ifnet *ifp; struct socket *so; int error; /* * Find an interface, rarp for its ip address, stuff it, the * implied broadcast addr, and netmask into a nfs_diskless struct. * * This was moved here from nfs_vfsops.c because this procedure * would be quite different if someone decides to write (i.e.) a * BOOTP version of this file (might not use RARP, etc.) */ /* * Find a network interface. */ if (nfsbootdevname) ifp = ifunit(nfsbootdevname); else { TAILQ_FOREACH(ifp, &ifnet, if_list) { if ((ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) == 0) break; } } if (ifp == NULL) panic("nfs_boot: no suitable interface"); bcopy(ifp->if_xname, ireq.ifr_name, IFNAMSIZ); printf("nfs_boot: using interface %s, with revarp & bootparams\n", ireq.ifr_name); /* * 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. */ if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0)) != 0) panic("nfs_boot: socreate, error=%d", error); error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)&ireq, procp); if (error) panic("nfs_boot: GIFFLAGS, error=%d", error); ireq.ifr_flags |= IFF_UP; error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)&ireq, procp); if (error) panic("nfs_boot: SIFFLAGS, error=%d", error); /* * Do RARP for the interface address. */ if ((error = revarpwhoami(&my_ip, ifp)) != 0) panic("reverse arp not answered by rarpd(8) or dhcpd(8)"); printf("nfs_boot: client_addr=%s\n", inet_ntoa(my_ip)); /* * Do enough of ifconfig(8) so that the chosen interface * can talk to the servers. (just set the address) */ sin = (struct sockaddr_in *)&ireq.ifr_addr; bzero((caddr_t)sin, sizeof(*sin)); sin->sin_len = sizeof(*sin); sin->sin_family = AF_INET; sin->sin_addr.s_addr = my_ip.s_addr; error = ifioctl(so, SIOCSIFADDR, (caddr_t)&ireq, procp); if (error) panic("nfs_boot: set if addr, error=%d", error); soclose(so); /* * Get client name and gateway address. * RPC: bootparam/whoami * Use the old broadcast address for the WHOAMI * call because we do not yet know our netmask. * The server address returned by the WHOAMI call * is used for all subsequent booptaram RPCs. */ bzero((caddr_t)&bp_sin, sizeof(bp_sin)); bp_sin.sin_len = sizeof(bp_sin); bp_sin.sin_family = AF_INET; bp_sin.sin_addr.s_addr = INADDR_BROADCAST; hostnamelen = MAXHOSTNAMELEN; /* this returns gateway IP address */ error = bp_whoami(&bp_sin, &my_ip, &gw_ip); if (error) panic("nfs_boot: bootparam whoami, error=%d", error); printf("nfs_boot: server_addr=%s hostname=%s\n", inet_ntoa(bp_sin.sin_addr), hostname); #ifdef NFS_BOOT_GATEWAY /* * XXX - This code is conditionally compiled only because * many bootparam servers (in particular, SunOS 4.1.3) * always set the gateway address to their own address. * The bootparam server is not necessarily the gateway. * We could just believe the server, and at worst you would * need to delete the incorrect default route before adding * the correct one, but for simplicity, ignore the gateway. * If your server is OK, you can turn on this option. * * If the gateway address is set, add a default route. * (The mountd RPCs may go across a gateway.) */ if (gw_ip.s_addr) { struct sockaddr dst, gw, mask; struct rt_addrinfo info; /* Destination: (default) */ bzero((caddr_t)&dst, sizeof(dst)); dst.sa_len = sizeof(dst); dst.sa_family = AF_INET; /* Gateway: */ bzero((caddr_t)&gw, sizeof(gw)); sin = (struct sockaddr_in *)&gw; sin->sin_len = sizeof(gw); sin->sin_family = AF_INET; sin->sin_addr.s_addr = gw_ip.s_addr; /* Mask: (zero length) */ bzero(&mask, sizeof(mask)); bzero(&info, sizeof(info)); info.rti_info[RTAX_DST] = &dst; info.rti_info[RTAX_GATEWAY] = &gw; info.rti_info[RTAX_NETMASK] = &mask; info.rti_flags = (RTF_UP | RTF_GATEWAY | RTF_STATIC); printf("nfs_boot: gateway=%s\n", inet_ntoa(gw_ip)); /* add, dest, gw, mask, flags, 0 */ error = rtrequest1(RTM_ADD, &info, RTP_STATIC, NULL, 0); if (error) printf("nfs_boot: add route, error=%d\n", error); } #endif bcopy(&bp_sin, &nd->nd_boot, sizeof(bp_sin)); return (0); } /* * bpsin: bootparam server * key: root or swap * ndmntp: output */ int nfs_boot_getfh(struct sockaddr_in *bpsin, char *key, struct nfs_dlmount *ndmntp, int retries) { char pathname[MAXPATHLEN]; char *sp, *dp, *endp; struct sockaddr_in *sin; int error; sin = &ndmntp->ndm_saddr; /* * Get server:pathname for "key" (root or swap) * using RPC to bootparam/getfile */ error = bp_getfile(bpsin, key, sin, ndmntp->ndm_host, pathname, retries); if (error) { printf("nfs_boot: bootparam get %s: %d\n", key, error); return (error); } /* * Get file handle for "key" (root or swap) * using RPC to mountd/mount */ error = md_mount(sin, pathname, ndmntp->ndm_fh); if (error) { printf("nfs_boot: mountd %s, error=%d\n", key, error); return (error); } /* Set port number for NFS use. */ /* XXX: NFS port is always 2049, right? */ error = krpc_portmap(sin, NFS_PROG, NFS_VER2, &sin->sin_port); if (error) { printf("nfs_boot: portmap NFS/v2, error=%d\n", error); return (error); } /* Construct remote path (for getmntinfo(3)) */ dp = ndmntp->ndm_host; endp = dp + MNAMELEN - 1; dp += strlen(dp); *dp++ = ':'; for (sp = pathname; *sp && dp < endp;) *dp++ = *sp++; *dp = '\0'; return (0); } /* * RPC: bootparam/whoami * Given client IP address, get: * client name (hostname) * domain name (domainname) * gateway address * * The hostname and domainname are set here for convenience. * * Note - bpsin is initialized to the broadcast address, * and will be replaced with the bootparam server address * after this call is complete. Have to use PMAP_PROC_CALL * to make sure we get responses only from a servers that * know about us (don't want to broadcast a getport call). */ static int bp_whoami(struct sockaddr_in *bpsin, struct in_addr *my_ip, struct in_addr *gw_ip) { /* RPC structures for PMAPPROC_CALLIT */ struct whoami_call { u_int32_t call_prog; u_int32_t call_vers; u_int32_t call_proc; u_int32_t call_arglen; } *call; struct callit_reply { u_int32_t port; u_int32_t encap_len; /* encapsulated data here */ } *reply; struct mbuf *m, *from; struct sockaddr_in *sin; int error, msg_len; int16_t port; /* * Build request message for PMAPPROC_CALLIT. */ m = m_get(M_WAIT, MT_DATA); call = mtod(m, struct whoami_call *); m->m_len = sizeof(*call); call->call_prog = txdr_unsigned(BOOTPARAM_PROG); call->call_vers = txdr_unsigned(BOOTPARAM_VERS); call->call_proc = txdr_unsigned(BOOTPARAM_WHOAMI); /* * append encapsulated data (client IP address) */ m->m_next = xdr_inaddr_encode(my_ip); call->call_arglen = txdr_unsigned(m->m_next->m_len); /* RPC: portmap/callit */ bpsin->sin_port = htons(PMAPPORT); from = NULL; error = krpc_call(bpsin, PMAPPROG, PMAPVERS, PMAPPROC_CALLIT, &m, &from, -1); if (error) return error; /* * Parse result message. */ if (m->m_len < sizeof(*reply)) { m = m_pullup(m, sizeof(*reply)); if (m == NULL) goto bad; } reply = mtod(m, struct callit_reply *); port = fxdr_unsigned(u_int32_t, reply->port); msg_len = fxdr_unsigned(u_int32_t, reply->encap_len); m_adj(m, sizeof(*reply)); /* * Save bootparam server address */ sin = mtod(from, struct sockaddr_in *); bpsin->sin_port = htons(port); bpsin->sin_addr.s_addr = sin->sin_addr.s_addr; /* client name */ hostnamelen = MAXHOSTNAMELEN-1; m = xdr_string_decode(m, hostname, &hostnamelen); if (m == NULL) goto bad; /* domain name */ domainnamelen = MAXHOSTNAMELEN-1; m = xdr_string_decode(m, domainname, &domainnamelen); if (m == NULL) goto bad; /* gateway address */ m = xdr_inaddr_decode(m, gw_ip); if (m == NULL) goto bad; /* success */ goto out; bad: printf("nfs_boot: bootparam_whoami: bad reply\n"); error = EBADRPC; out: if (from) m_freem(from); if (m) m_freem(m); return(error); } /* * RPC: bootparam/getfile * Given client name and file "key", get: * server name * server IP address * server pathname */ static int bp_getfile(struct sockaddr_in *bpsin, char *key, struct sockaddr_in *md_sin, char *serv_name, char *pathname, int retries) { struct mbuf *m; struct sockaddr_in *sin; struct in_addr inaddr; int error, sn_len, path_len; /* * Build request message. */ /* client name (hostname) */ m = xdr_string_encode(hostname, hostnamelen); if (m == NULL) return (ENOMEM); /* key name (root or swap) */ m->m_next = xdr_string_encode(key, strlen(key)); if (m->m_next == NULL) return (ENOMEM); /* RPC: bootparam/getfile */ error = krpc_call(bpsin, BOOTPARAM_PROG, BOOTPARAM_VERS, BOOTPARAM_GETFILE, &m, NULL, retries); if (error) return error; /* * Parse result message. */ /* server name */ sn_len = MNAMELEN-1; m = xdr_string_decode(m, serv_name, &sn_len); if (m == NULL) goto bad; /* server IP address (mountd/NFS) */ m = xdr_inaddr_decode(m, &inaddr); if (m == NULL) goto bad; /* server pathname */ path_len = MAXPATHLEN-1; m = xdr_string_decode(m, pathname, &path_len); if (m == NULL) goto bad; /* setup server socket address */ sin = md_sin; bzero((caddr_t)sin, sizeof(*sin)); sin->sin_len = sizeof(*sin); sin->sin_family = AF_INET; sin->sin_addr = inaddr; /* success */ goto out; bad: printf("nfs_boot: bootparam_getfile: bad reply\n"); error = EBADRPC; out: m_freem(m); return(error); } /* * RPC: mountd/mount * Given a server pathname, get an NFS file handle. * Also, sets sin->sin_port to the NFS service port. * mdsin: mountd server address */ static int md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp) { /* The RPC structures */ struct rdata { u_int32_t errno; u_int8_t fh[NFSX_V2FH]; } *rdata; struct mbuf *m; int error; /* Get port number for MOUNTD. */ error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1, &mdsin->sin_port); if (error) return error; m = xdr_string_encode(path, strlen(path)); if (m == NULL) return ENOMEM; /* Do RPC to mountd. */ error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1, RPCMNT_MOUNT, &m, NULL, -1); if (error) return error; /* message already freed */ /* The reply might have only the errno. */ if (m->m_len < 4) goto bad; /* Have at least errno, so check that. */ rdata = mtod(m, struct rdata *); error = fxdr_unsigned(u_int32_t, rdata->errno); if (error) goto out; /* Have errno==0, so the fh must be there. */ if (m->m_len < sizeof(*rdata)) { m = m_pullup(m, sizeof(*rdata)); if (m == NULL) goto bad; rdata = mtod(m, struct rdata *); } bcopy(rdata->fh, fhp, NFSX_V2FH); goto out; bad: error = EBADRPC; out: m_freem(m); return error; } #endif /* ifdef NFSCLIENT */