Current Path : /sys/nfs/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/nfs/nfs_diskless.c |
/*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * 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. * 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. * * from: @(#)autoconf.c 7.1 (Berkeley) 5/9/91 */ #include <sys/cdefs.h> __FBSDID("$FreeBSD: release/9.1.0/sys/nfs/nfs_diskless.c 221436 2011-05-04 13:27:45Z ru $"); #include "opt_bootp.h" #include <sys/param.h> #include <sys/systm.h> #include <sys/jail.h> #include <sys/kernel.h> #include <sys/malloc.h> #include <sys/mount.h> #include <sys/socket.h> #include <net/if.h> #include <net/if_dl.h> #include <net/if_types.h> #include <net/if_var.h> #include <net/ethernet.h> #include <net/vnet.h> #include <netinet/in.h> #include <nfs/nfsproto.h> #include <nfsclient/nfs.h> #include <nfs/nfsdiskless.h> static int inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa); static int hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa); static int decode_nfshandle(char *ev, u_char *fh, int maxfh); /* * This structure must be filled in by a primary bootstrap or bootstrap * server for a diskless/dataless machine. It is initialized below just * to ensure that it is allocated to initialized data (.data not .bss). */ struct nfs_diskless nfs_diskless = { { { 0 } } }; struct nfsv3_diskless nfsv3_diskless = { { { 0 } } }; int nfs_diskless_valid = 0; /* * Validate/sanity check a rsize/wsize parameter. */ static int checkrwsize(unsigned long v, const char *name) { /* * 32K is used as an upper bound because most servers * limit block size to satisfy IPv4's limit of * 64K/reassembled packet. The lower bound is pretty * much arbitrary. */ if (!(4 <= v && v <= 32*1024)) { printf("nfs_parse_options: invalid %s %lu ignored\n", name, v); return 0; } else return 1; } /* * Parse mount options and apply them to the supplied * nfs_diskless state. Used also by bootp/dhcp support. */ void nfs_parse_options(const char *envopts, struct nfs_args *nd) { char *opts, *o, *otmp; unsigned long v; opts = strdup(envopts, M_TEMP); otmp = opts; while ((o = strsep(&otmp, ":;, ")) != NULL) { if (*o == '\0') ; /* Skip empty options. */ else if (strcmp(o, "soft") == 0) nd->flags |= NFSMNT_SOFT; else if (strcmp(o, "intr") == 0) nd->flags |= NFSMNT_INT; else if (strcmp(o, "conn") == 0) nd->flags |= NFSMNT_NOCONN; else if (strcmp(o, "nolockd") == 0) nd->flags |= NFSMNT_NOLOCKD; else if (strcmp(o, "nocto") == 0) nd->flags |= NFSMNT_NOCTO; else if (strcmp(o, "nfsv2") == 0) nd->flags &= ~(NFSMNT_NFSV3 | NFSMNT_NFSV4); else if (strcmp(o, "nfsv3") == 0) { nd->flags &= ~NFSMNT_NFSV4; nd->flags |= NFSMNT_NFSV3; } else if (strcmp(o, "tcp") == 0) nd->sotype = SOCK_STREAM; else if (strcmp(o, "udp") == 0) nd->sotype = SOCK_DGRAM; else if (strncmp(o, "rsize=", 6) == 0) { v = strtoul(o+6, NULL, 10); if (checkrwsize(v, "rsize")) { nd->rsize = (int) v; nd->flags |= NFSMNT_RSIZE; } } else if (strncmp(o, "wsize=", 6) == 0) { v = strtoul(o+6, NULL, 10); if (checkrwsize(v, "wsize")) { nd->wsize = (int) v; nd->flags |= NFSMNT_WSIZE; } } else printf("%s: skipping unknown option \"%s\"\n", __func__, o); } free(opts, M_TEMP); } /* * Populate the essential fields in the nfsv3_diskless structure. * * The loader is expected to export the following environment variables: * * boot.netif.name name of boot interface * boot.netif.ip IP address on boot interface * boot.netif.netmask netmask on boot interface * boot.netif.gateway default gateway (optional) * boot.netif.hwaddr hardware address of boot interface * boot.nfsroot.server IP address of root filesystem server * boot.nfsroot.path path of the root filesystem on server * boot.nfsroot.nfshandle NFS handle for root filesystem on server * boot.nfsroot.nfshandlelen and length of this handle (for NFSv3 only) * boot.nfsroot.options NFS options for the root filesystem */ void nfs_setup_diskless(void) { struct nfs_diskless *nd = &nfs_diskless; struct nfsv3_diskless *nd3 = &nfsv3_diskless; struct ifnet *ifp; struct ifaddr *ifa; struct sockaddr_dl *sdl, ourdl; struct sockaddr_in myaddr, netmask; char *cp; int cnt, fhlen, is_nfsv3; uint32_t len; if (nfs_diskless_valid != 0) return; /* get handle size. If this succeeds, it's an NFSv3 setup. */ if ((cp = getenv("boot.nfsroot.nfshandlelen")) != NULL) { cnt = sscanf(cp, "%d", &len); freeenv(cp); if (cnt != 1 || len == 0 || len > NFSX_V3FHMAX) { printf("nfs_diskless: bad NFS handle len\n"); return; } nd3->root_fhsize = len; is_nfsv3 = 1; } else is_nfsv3 = 0; /* set up interface */ if (inaddr_to_sockaddr("boot.netif.ip", &myaddr)) return; if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) { printf("nfs_diskless: no netmask\n"); return; } if (is_nfsv3 != 0) { bcopy(&myaddr, &nd3->myif.ifra_addr, sizeof(myaddr)); bcopy(&myaddr, &nd3->myif.ifra_broadaddr, sizeof(myaddr)); ((struct sockaddr_in *) &nd3->myif.ifra_broadaddr)->sin_addr.s_addr = myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr; bcopy(&netmask, &nd3->myif.ifra_mask, sizeof(netmask)); } else { bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr)); bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr)); ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr = myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr; bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask)); } if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) { printf("nfs_diskless: no hardware address\n"); return; } ifa = NULL; CURVNET_SET(TD_TO_VNET(curthread)); IFNET_RLOCK(); TAILQ_FOREACH(ifp, &V_ifnet, if_link) { TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { if (ifa->ifa_addr->sa_family == AF_LINK) { sdl = (struct sockaddr_dl *)ifa->ifa_addr; if ((sdl->sdl_type == ourdl.sdl_type) && (sdl->sdl_alen == ourdl.sdl_alen) && !bcmp(LLADDR(sdl), LLADDR(&ourdl), sdl->sdl_alen)) { IFNET_RUNLOCK(); CURVNET_RESTORE(); goto match_done; } } } } IFNET_RUNLOCK(); CURVNET_RESTORE(); printf("nfs_diskless: no interface\n"); return; /* no matching interface */ match_done: setenv("boot.netif.name", ifp->if_xname); if (is_nfsv3 != 0) { strlcpy(nd3->myif.ifra_name, ifp->if_xname, sizeof(nd3->myif.ifra_name)); /* set up gateway */ inaddr_to_sockaddr("boot.netif.gateway", &nd3->mygateway); /* set up root mount */ nd3->root_args.rsize = 32768; /* XXX tunable? */ nd3->root_args.wsize = 32768; nd3->root_args.sotype = SOCK_STREAM; nd3->root_args.flags = (NFSMNT_NFSV3 | NFSMNT_WSIZE | NFSMNT_RSIZE | NFSMNT_RESVPORT); if (inaddr_to_sockaddr("boot.nfsroot.server", &nd3->root_saddr)) { printf("nfs_diskless: no server\n"); return; } nd3->root_saddr.sin_port = htons(NFS_PORT); fhlen = decode_nfshandle("boot.nfsroot.nfshandle", &nd3->root_fh[0], NFSX_V3FHMAX); if (fhlen == 0) { printf("nfs_diskless: no NFS handle\n"); return; } if (fhlen != nd3->root_fhsize) { printf("nfs_diskless: bad NFS handle len=%d\n", fhlen); return; } if ((cp = getenv("boot.nfsroot.path")) != NULL) { strncpy(nd3->root_hostnam, cp, MNAMELEN - 1); freeenv(cp); } if ((cp = getenv("boot.nfsroot.options")) != NULL) { nfs_parse_options(cp, &nd3->root_args); freeenv(cp); } nfs_diskless_valid = 3; } else { strlcpy(nd->myif.ifra_name, ifp->if_xname, sizeof(nd->myif.ifra_name)); /* set up gateway */ inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway); /* set up root mount */ nd->root_args.rsize = 8192; /* XXX tunable? */ nd->root_args.wsize = 8192; nd->root_args.sotype = SOCK_STREAM; nd->root_args.flags = (NFSMNT_WSIZE | NFSMNT_RSIZE | NFSMNT_RESVPORT); if (inaddr_to_sockaddr("boot.nfsroot.server", &nd->root_saddr)) { printf("nfs_diskless: no server\n"); return; } nd->root_saddr.sin_port = htons(NFS_PORT); if (decode_nfshandle("boot.nfsroot.nfshandle", &nd->root_fh[0], NFSX_V2FH) == 0) { printf("nfs_diskless: no NFS handle\n"); return; } if ((cp = getenv("boot.nfsroot.path")) != NULL) { strncpy(nd->root_hostnam, cp, MNAMELEN - 1); freeenv(cp); } if ((cp = getenv("boot.nfsroot.options")) != NULL) { struct nfs_args args; /* * XXX yech, convert between old and current * arg format */ args.flags = nd->root_args.flags; args.sotype = nd->root_args.sotype; args.rsize = nd->root_args.rsize; args.wsize = nd->root_args.wsize; nfs_parse_options(cp, &args); nd->root_args.flags = args.flags; nd->root_args.sotype = args.sotype; nd->root_args.rsize = args.rsize; nd->root_args.wsize = args.wsize; freeenv(cp); } nfs_diskless_valid = 1; } } static int inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa) { u_int32_t a[4]; char *cp; int count; bzero(sa, sizeof(*sa)); sa->sin_len = sizeof(*sa); sa->sin_family = AF_INET; if ((cp = getenv(ev)) == NULL) return (1); count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]); freeenv(cp); if (count != 4) return (1); sa->sin_addr.s_addr = htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]); return (0); } static int hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa) { char *cp; u_int32_t a[6]; int count; bzero(sa, sizeof(*sa)); sa->sdl_len = sizeof(*sa); sa->sdl_family = AF_LINK; sa->sdl_type = IFT_ETHER; sa->sdl_alen = ETHER_ADDR_LEN; if ((cp = getenv(ev)) == NULL) return (1); count = sscanf(cp, "%x:%x:%x:%x:%x:%x", &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]); freeenv(cp); if (count != 6) return (1); sa->sdl_data[0] = a[0]; sa->sdl_data[1] = a[1]; sa->sdl_data[2] = a[2]; sa->sdl_data[3] = a[3]; sa->sdl_data[4] = a[4]; sa->sdl_data[5] = a[5]; return (0); } static int decode_nfshandle(char *ev, u_char *fh, int maxfh) { u_char *cp, *ep; int len, val; ep = cp = getenv(ev); if (cp == NULL) return (0); if ((strlen(cp) < 2) || (*cp != 'X')) { freeenv(ep); return (0); } len = 0; cp++; for (;;) { if (*cp == 'X') { freeenv(ep); return (len); } if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) { freeenv(ep); return (0); } *(fh++) = val; len++; cp += 2; if (len > maxfh) { freeenv(ep); return (0); } } } #if !defined(BOOTP_NFSROOT) static void nfs_rootconf(void) { nfs_setup_diskless(); if (nfs_diskless_valid) rootdevnames[0] = "nfs:"; } SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL); #endif