diff options
Diffstat (limited to 'sys/nfsclient/bootp_subr.c')
| -rw-r--r-- | sys/nfsclient/bootp_subr.c | 2018 |
1 files changed, 2018 insertions, 0 deletions
diff --git a/sys/nfsclient/bootp_subr.c b/sys/nfsclient/bootp_subr.c new file mode 100644 index 0000000..ee1e824 --- /dev/null +++ b/sys/nfsclient/bootp_subr.c @@ -0,0 +1,2018 @@ +/* + * 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 <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "opt_bootp.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/sockio.h> +#include <sys/malloc.h> +#include <sys/mount.h> +#include <sys/mbuf.h> +#include <sys/proc.h> +#include <sys/socket.h> +#include <sys/socketvar.h> +#include <sys/sysctl.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 <nfsclient/nfs.h> +#include <nfsclient/nfsdiskless.h> +#include <nfsclient/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[1222]; +}; + +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_BOOTP_FAILED, + IF_DHCP_UNRESOLVED, + IF_DHCP_OFFERED, + IF_DHCP_RESOLVED, + IF_DHCP_FAILED, + } state; + int dhcpquerytype; /* dhcp type sent */ + struct in_addr dhcpserver; + int gotdhcpserver; +}; + +#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 +#define TAG_COOKIE 134 /* ascii info for userland, via sysctl */ + +#define TAG_DHCP_MSGTYPE 53 +#define TAG_DHCP_REQ_ADDR 50 +#define TAG_DHCP_SERVERID 54 +#define TAG_DHCP_LEASETIME 51 + +#define TAG_VENDOR_INDENTIFIER 60 + +#define DHCP_NOMSG 0 +#define DHCP_DISCOVER 1 +#define DHCP_OFFER 2 +#define DHCP_REQUEST 3 +#define DHCP_ACK 5 + +static char bootp_cookie[128]; +SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD, + bootp_cookie, 0, "Cookie (T134) supplied by bootp server"); + +/* mountd RPC */ +static int md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, + int *fhsizep, struct nfs_args *args, struct thread *td); +static int md_lookup_swap(struct sockaddr_in *mdsin, char *path, + u_char *fhp, int *fhsizep, struct nfs_args *args, + struct thread *td); +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 thread *td); +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 thread *td); + +static int bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, + struct bootpc_globalcontext *gctx, struct thread *td); + +static int bootpc_adjust_interface(struct bootpc_ifcontext *ifctx, + struct bootpc_globalcontext *gctx, struct thread *td); + +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); + +static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx); +static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx); +static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx); + +/* + * 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"); + RADIX_NODE_LOCK(rt_tables[AF_INET]); /* could sleep XXX */ + bootpboot_p_tree(rt_tables[AF_INET]->rnh_treetop); + RADIX_NODE_UNLOCK(rt_tables[AF_INET]); +} + +void +bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa) +{ + + printf("%s%d flags %x, addr ", + ifp->if_name, + ifp->if_unit, + 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"); + IFNET_RLOCK(); /* could sleep, but okay for debugging XXX */ + 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); + } + IFNET_RUNLOCK(); +} +#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; +#ifdef BOOTP_NO_DHCP + ifctx->state = IF_BOOTP_UNRESOLVED; +#else + ifctx->state = IF_DHCP_UNRESOLVED; +#endif + gctx->xid += 0x100; + return ifctx; +} + +static __inline int +bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx) +{ + + if (ifctx->state == IF_BOOTP_RESOLVED || + ifctx->state == IF_DHCP_RESOLVED) + return 1; + return 0; +} + +static __inline int +bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx) +{ + + if (ifctx->state == IF_BOOTP_UNRESOLVED || + ifctx->state == IF_DHCP_UNRESOLVED) + return 1; + return 0; +} + +static __inline int +bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx) +{ + + if (ifctx->state == IF_BOOTP_FAILED || + ifctx->state == IF_DHCP_FAILED) + return 1; + return 0; +} + +static int +bootpc_received(struct bootpc_globalcontext *gctx, + struct bootpc_ifcontext *ifctx) +{ + unsigned char dhcpreplytype; + char *p; + + /* + * 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; + + p = bootpc_tag(&gctx->tmptag, &gctx->reply, + gctx->replylen, TAG_DHCP_MSGTYPE); + if (p != NULL) + dhcpreplytype = *p; + else + dhcpreplytype = DHCP_NOMSG; + + switch (ifctx->dhcpquerytype) { + case DHCP_DISCOVER: + if (dhcpreplytype != DHCP_OFFER /* Normal DHCP offer */ +#ifndef BOOTP_FORCE_DHCP + && dhcpreplytype != DHCP_NOMSG /* Fallback to BOOTP */ +#endif + ) + return 0; + break; + case DHCP_REQUEST: + if (dhcpreplytype != DHCP_ACK) + return 0; + case DHCP_NOMSG: + break; + } + + /* Ignore packet unless it gives us a root tag we didn't have */ + + if ((ifctx->state == IF_BOOTP_RESOLVED || + (ifctx->dhcpquerytype == DHCP_DISCOVER && + (ifctx->state == IF_DHCP_OFFERED || + ifctx->state == IF_DHCP_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 */ + if (ifctx->state == IF_BOOTP_UNRESOLVED) + ifctx->state = IF_BOOTP_RESOLVED; + else if (ifctx->state == IF_DHCP_UNRESOLVED && + ifctx->dhcpquerytype == DHCP_DISCOVER) { + if (dhcpreplytype == DHCP_OFFER) + ifctx->state = IF_DHCP_OFFERED; + else + ifctx->state = IF_BOOTP_RESOLVED; /* Fallback */ + } else if (ifctx->state == IF_DHCP_OFFERED && + ifctx->dhcpquerytype == DHCP_REQUEST) + ifctx->state = IF_DHCP_RESOLVED; + + + if (ifctx->dhcpquerytype == DHCP_DISCOVER && + ifctx->state != IF_BOOTP_RESOLVED) { + p = bootpc_tag(&gctx->tmptag, &ifctx->reply, + ifctx->replylen, TAG_DHCP_SERVERID); + if (p != NULL && gctx->tmptag.taglen == 4) { + memcpy(&ifctx->dhcpserver, p, 4); + ifctx->gotdhcpserver = 1; + } else + ifctx->gotdhcpserver = 0; + return 1; + } + + 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 thread *td) +{ + 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; + int retry; + const char *s; + + /* + * Create socket and set its recieve timeout. + */ + error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td->td_ucred, td); + if (error != 0) + goto out0; + + 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, td); + 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 (bootpc_ifctx_isresolved(ifctx) != 0 && + 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 (bootpc_ifctx_isresolved(ifctx) != 0 && + gotrootpath != 0) { + continue; + } + if (bootpc_ifctx_isfailed(ifctx) != 0) + continue; + + outstanding++; + ifctx->outstanding = 1; + + /* Proceed to next step in DHCP negotiation */ + if ((ifctx->state == IF_DHCP_OFFERED && + ifctx->dhcpquerytype != DHCP_REQUEST) || + (ifctx->state == IF_DHCP_UNRESOLVED && + ifctx->dhcpquerytype != DHCP_DISCOVER) || + (ifctx->state == IF_BOOTP_UNRESOLVED && + ifctx->dhcpquerytype != DHCP_NOMSG)) { + ifctx->sentmsg = 0; + bootpc_compose_query(ifctx, gctx, td); + } + + /* Send BOOTP request (or re-send). */ + + if (ifctx->sentmsg == 0) { + switch(ifctx->dhcpquerytype) { + case DHCP_DISCOVER: + s = "DHCP Discover"; + break; + case DHCP_REQUEST: + s = "DHCP Request"; + break; + case DHCP_NOMSG: + default: + s = "BOOTP Query"; + break; + } + printf("Sending %s packet from " + "interface %s (%*D)\n", + s, + 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_td = td; + + /* 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, td); + if (error != 0) + panic("bootpc_call:" + "set if netmask, error=%d", + error); + + error = sosend(so, (struct sockaddr *) &dst, + &auio, NULL, NULL, 0, td); + 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, td); + 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("DHCP/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_td = td; + + 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 (bootpc_ifctx_isresolved(ifctx) != 0 || + bootpc_ifctx_isfailed(ifctx) != 0) + 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) { + s = bootpc_tag(&gctx->tmptag, + &gctx->reply, + gctx->replylen, + TAG_DHCP_MSGTYPE); + if (s != NULL) { + switch (*s) { + case DHCP_OFFER: + s = "DHCP Offer"; + break; + case DHCP_ACK: + s = "DHCP Ack"; + break; + default: + s = "DHCP (unexpected)"; + break; + } + } else + s = "BOOTP Reply"; + + printf("Received %s packet" + " on %s from ", + s, + 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 + /* Force a retry if halfway in DHCP negotiation */ + retry = 0; + for (ifctx = gctx->interfaces; ifctx != NULL; + ifctx = ifctx->next) { + if (ifctx->state == IF_DHCP_OFFERED) { + if (ifctx->dhcpquerytype == DHCP_DISCOVER) + retry = 1; + else + ifctx->state = IF_DHCP_UNRESOLVED; + } + } + + if (retry != 0) + continue; + + 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 (bootpc_ifctx_isresolved(ifctx) == 0) { + printf("%s timeout for interface %s\n", + ifctx->dhcpquerytype != DHCP_NOMSG ? + "DHCP" : "BOOTP", + 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 (bootpc_ifctx_isresolved(ifctx) != 0) { + error = 0; + goto out; + } + } +#endif + error = ETIMEDOUT; + goto out; + +gotreply: +out: + soclose(so); +out0: + return error; +} + +static int +bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, + struct bootpc_globalcontext *gctx, struct thread *td) +{ + 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, td->td_ucred, td); + 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, td); + if (error != 0) + panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error); + ireq->ifr_flags |= IFF_UP; + error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td); + 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, td); + 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, td); + 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, td); + 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 thread *td) +{ + 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 (bootpc_ifctx_isresolved(ifctx) == 0) { + + /* Shutdown interfaces where BOOTP failed */ + + printf("Shutdown interface %s\n", ifctx->ireq.ifr_name); + error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td); + if (error != 0) + panic("bootpc_adjust_interface: " + "SIOCGIFFLAGS, error=%d", error); + ireq->ifr_flags &= ~IFF_UP; + error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td); + 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, td); + 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, td); + 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, td); + 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, td); + 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(struct bootpc_ifcontext *ifctx, + struct bootpc_globalcontext *gctx, struct thread *td) +{ + unsigned char *vendp; + unsigned char vendor_client[64]; + uint32_t leasetime; + uint8_t vendor_client_len; + + 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; + if (bootpc_ifctx_isunresolved(ifctx) != 0) + ifctx->xid++; + ifctx->call.xid = txdr_unsigned(ifctx->xid); + bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen); + + vendp = ifctx->call.vend; + *vendp++ = 99; /* RFC1048 cookie */ + *vendp++ = 130; + *vendp++ = 83; + *vendp++ = 99; + *vendp++ = TAG_MAXMSGSIZE; + *vendp++ = 2; + *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255; + *vendp++ = sizeof(struct bootp_packet) & 255; + + snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s", + ostype, MACHINE, osrelease); + vendor_client_len = strlen(vendor_client); + *vendp++ = TAG_VENDOR_INDENTIFIER; + *vendp++ = vendor_client_len; + memcpy(vendp, vendor_client, vendor_client_len); + vendp += vendor_client_len;; + ifctx->dhcpquerytype = DHCP_NOMSG; + switch (ifctx->state) { + case IF_DHCP_UNRESOLVED: + *vendp++ = TAG_DHCP_MSGTYPE; + *vendp++ = 1; + *vendp++ = DHCP_DISCOVER; + ifctx->dhcpquerytype = DHCP_DISCOVER; + ifctx->gotdhcpserver = 0; + break; + case IF_DHCP_OFFERED: + *vendp++ = TAG_DHCP_MSGTYPE; + *vendp++ = 1; + *vendp++ = DHCP_REQUEST; + ifctx->dhcpquerytype = DHCP_REQUEST; + *vendp++ = TAG_DHCP_REQ_ADDR; + *vendp++ = 4; + memcpy(vendp, &ifctx->reply.yiaddr, 4); + vendp += 4; + if (ifctx->gotdhcpserver != 0) { + *vendp++ = TAG_DHCP_SERVERID; + *vendp++ = 4; + memcpy(vendp, &ifctx->dhcpserver, 4); + vendp += 4; + } + *vendp++ = TAG_DHCP_LEASETIME; + *vendp++ = 4; + leasetime = htonl(300); + memcpy(vendp, &leasetime, 4); + vendp += 4; + break; + default: + break; + } + *vendp = TAG_END; + + ifctx->call.secs = 0; + ifctx->call.flags = htons(0x8000); /* We need a 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) +{ + tctx->overload = 0; + tctx->badopt = 0; + tctx->badtag = 0; + tctx->foundopt = 0; + tctx->taglen = 0; + + if (bootpc_hascookie(bp) == 0) + return NULL; + + 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(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; + } + } + p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, + TAG_COOKIE); + if (p != NULL) { /* store in a sysctl variable */ + int i, l = sizeof(bootp_cookie) - 1; + for (i = 0; i < l && p[i] != '\0'; i++) + bootp_cookie[i] = p[i]; + p[i] = '\0'; + } + + + 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 thread *td; + + nd = &nfsv3_diskless; + td = curthread; + + /* + * If already filled in, don't touch it here + */ + if (nfs_diskless_valid != 0) + return; + + 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)); + IFNET_RLOCK(); + 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); + } + IFNET_RUNLOCK(); + 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 + } + + gctx->gotrootpath = 0; + gctx->gotswappath = 0; + gctx->gotgw = 0; + + for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) + bootpc_fakeup_interface(ifctx, gctx, td); + + for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) + bootpc_compose_query(ifctx, gctx, td); + + ifctx = gctx->interfaces; + error = bootpc_call(gctx, td); + + 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 (bootpc_ifctx_isresolved(ifctx) != 0) + 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, td); + + 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 (bootpc_ifctx_isresolved(ifctx) != 0) + 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, td); + 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, td); + 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, td); + 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, char *path, u_char *fhp, int *fhsizep, + struct nfs_args *args, struct thread *td) +{ + 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, td); + 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, td); + } + 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, td); + 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, td); + 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, td); + + goto out; + +bad: + error = EBADRPC; + +out: + m_freem(m); + return error; +} + +static int +md_lookup_swap(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep, + struct nfs_args *args, struct thread *td) +{ + 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_TRYWAIT, 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, td); + else + error = krpc_call(mdsin, NFS_PROG, NFS_VER2, + NFSV2PROC_LOOKUP, &m, NULL, td); + 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; +} |
