The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/nfs/bootp_subr.c

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    1 /*-
    2  * Copyright (c) 1995 Gordon Ross, Adam Glass
    3  * Copyright (c) 1992 Regents of the University of California.
    4  * All rights reserved.
    5  *
    6  * This software was developed by the Computer Systems Engineering group
    7  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
    8  * contributed to Berkeley.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the University of
   21  *      California, Lawrence Berkeley Laboratory and its contributors.
   22  * 4. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  * based on:
   39  *      nfs/krpc_subr.c
   40  *      $NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $
   41  */
   42 
   43 #include <sys/cdefs.h>
   44 __FBSDID("$FreeBSD: releng/11.2/sys/nfs/bootp_subr.c 331722 2018-03-29 02:50:57Z eadler $");
   45 
   46 #include "opt_bootp.h"
   47 #include "opt_nfs.h"
   48 #include "opt_rootdevname.h"
   49 
   50 #include <sys/param.h>
   51 #include <sys/systm.h>
   52 #include <sys/endian.h>
   53 #include <sys/jail.h>
   54 #include <sys/kernel.h>
   55 #include <sys/sockio.h>
   56 #include <sys/malloc.h>
   57 #include <sys/mount.h>
   58 #include <sys/mbuf.h>
   59 #include <sys/proc.h>
   60 #include <sys/reboot.h>
   61 #include <sys/socket.h>
   62 #include <sys/socketvar.h>
   63 #include <sys/sysctl.h>
   64 #include <sys/uio.h>
   65 
   66 #include <net/if.h>
   67 #include <net/if_var.h>
   68 #include <net/route.h>
   69 #ifdef BOOTP_DEBUG
   70 #include <net/route_var.h>
   71 #endif
   72 
   73 #include <netinet/in.h>
   74 #include <netinet/in_var.h>
   75 #include <net/if_types.h>
   76 #include <net/if_dl.h>
   77 #include <net/vnet.h>
   78 
   79 #include <nfs/nfsproto.h>
   80 #include <nfsclient/nfs.h>
   81 #include <nfs/nfsdiskless.h>
   82 #include <nfs/krpc.h>
   83 #include <nfs/xdr_subs.h>
   84 
   85 
   86 #define BOOTP_MIN_LEN           300     /* Minimum size of bootp udp packet */
   87 
   88 #ifndef BOOTP_SETTLE_DELAY
   89 #define BOOTP_SETTLE_DELAY 3
   90 #endif
   91 
   92 /* 
   93  * Wait 10 seconds for interface appearance
   94  * USB ethernet adapters might require some time to pop up
   95  */
   96 #ifndef BOOTP_IFACE_WAIT_TIMEOUT
   97 #define BOOTP_IFACE_WAIT_TIMEOUT        10
   98 #endif
   99 
  100 /*
  101  * What is the longest we will wait before re-sending a request?
  102  * Note this is also the frequency of "RPC timeout" messages.
  103  * The re-send loop count sup linearly to this maximum, so the
  104  * first complaint will happen after (1+2+3+4+5)=15 seconds.
  105  */
  106 #define MAX_RESEND_DELAY 5      /* seconds */
  107 
  108 /* Definitions from RFC951 */
  109 struct bootp_packet {
  110         u_int8_t op;
  111         u_int8_t htype;
  112         u_int8_t hlen;
  113         u_int8_t hops;
  114         u_int32_t xid;
  115         u_int16_t secs;
  116         u_int16_t flags;
  117         struct in_addr ciaddr;
  118         struct in_addr yiaddr;
  119         struct in_addr siaddr;
  120         struct in_addr giaddr;
  121         unsigned char chaddr[16];
  122         char sname[64];
  123         char file[128];
  124         unsigned char vend[1222];
  125 };
  126 
  127 struct bootpc_ifcontext {
  128         STAILQ_ENTRY(bootpc_ifcontext) next;
  129         struct bootp_packet call;
  130         struct bootp_packet reply;
  131         int replylen;
  132         int overload;
  133         union {
  134                 struct ifreq _ifreq;
  135                 struct in_aliasreq _in_alias_req;
  136         } _req;
  137 #define ireq    _req._ifreq
  138 #define iareq   _req._in_alias_req
  139         struct ifnet *ifp;
  140         struct sockaddr_dl *sdl;
  141         struct sockaddr_in myaddr;
  142         struct sockaddr_in netmask;
  143         struct sockaddr_in gw;
  144         int gotgw;
  145         int gotnetmask;
  146         int gotrootpath;
  147         int outstanding;
  148         int sentmsg;
  149         u_int32_t xid;
  150         enum {
  151                 IF_BOOTP_UNRESOLVED,
  152                 IF_BOOTP_RESOLVED,
  153                 IF_BOOTP_FAILED,
  154                 IF_DHCP_UNRESOLVED,
  155                 IF_DHCP_OFFERED,
  156                 IF_DHCP_RESOLVED,
  157                 IF_DHCP_FAILED,
  158         } state;
  159         int dhcpquerytype;              /* dhcp type sent */
  160         struct in_addr dhcpserver;
  161         int gotdhcpserver;
  162         uint16_t mtu;
  163 };
  164 
  165 #define TAG_MAXLEN 1024
  166 struct bootpc_tagcontext {
  167         char buf[TAG_MAXLEN + 1];
  168         int overload;
  169         int badopt;
  170         int badtag;
  171         int foundopt;
  172         int taglen;
  173 };
  174 
  175 struct bootpc_globalcontext {
  176         STAILQ_HEAD(, bootpc_ifcontext) interfaces;
  177         u_int32_t xid;
  178         int any_root_overrides;
  179         int gotrootpath;
  180         int gotgw;
  181         int ifnum;
  182         int secs;
  183         int starttime;
  184         struct bootp_packet reply;
  185         int replylen;
  186         struct bootpc_ifcontext *setrootfs;
  187         struct bootpc_ifcontext *sethostname;
  188         struct bootpc_tagcontext tmptag;
  189         struct bootpc_tagcontext tag;
  190 };
  191 
  192 #define IPPORT_BOOTPC 68
  193 #define IPPORT_BOOTPS 67
  194 
  195 #define BOOTP_REQUEST 1
  196 #define BOOTP_REPLY 2
  197 
  198 /* Common tags */
  199 #define TAG_PAD           0  /* Pad option, implicit length 1 */
  200 #define TAG_SUBNETMASK    1  /* RFC 950 subnet mask */
  201 #define TAG_ROUTERS       3  /* Routers (in order of preference) */
  202 #define TAG_HOSTNAME     12  /* Client host name */
  203 #define TAG_ROOT         17  /* Root path */
  204 #define TAG_INTF_MTU     26  /* Interface MTU Size (RFC2132) */
  205 
  206 /* DHCP specific tags */
  207 #define TAG_OVERLOAD     52  /* Option Overload */
  208 #define TAG_MAXMSGSIZE   57  /* Maximum DHCP Message Size */
  209 
  210 #define TAG_END         255  /* End Option (i.e. no more options) */
  211 
  212 /* Overload values */
  213 #define OVERLOAD_FILE     1
  214 #define OVERLOAD_SNAME    2
  215 
  216 /* Site specific tags: */
  217 #define TAG_ROOTOPTS    130
  218 #define TAG_COOKIE      134     /* ascii info for userland, via sysctl */
  219 
  220 #define TAG_DHCP_MSGTYPE 53
  221 #define TAG_DHCP_REQ_ADDR 50
  222 #define TAG_DHCP_SERVERID 54
  223 #define TAG_DHCP_LEASETIME 51
  224 
  225 #define TAG_VENDOR_INDENTIFIER 60
  226 
  227 #define DHCP_NOMSG    0
  228 #define DHCP_DISCOVER 1
  229 #define DHCP_OFFER    2
  230 #define DHCP_REQUEST  3
  231 #define DHCP_ACK      5
  232 
  233 /* NFS read/write block size */
  234 #ifndef BOOTP_BLOCKSIZE
  235 #define BOOTP_BLOCKSIZE 8192
  236 #endif
  237 
  238 static char bootp_cookie[128];
  239 static struct socket *bootp_so;
  240 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
  241         bootp_cookie, 0, "Cookie (T134) supplied by bootp server");
  242 
  243 /* mountd RPC */
  244 static int      md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp,
  245                     int *fhsizep, struct nfs_args *args, struct thread *td);
  246 static int      setfs(struct sockaddr_in *addr, char *path, char *p,
  247                     const struct in_addr *siaddr);
  248 static int      getdec(char **ptr);
  249 static int      getip(char **ptr, struct in_addr *ip);
  250 static void     mountopts(struct nfs_args *args, char *p);
  251 static int      xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len);
  252 static int      xdr_int_decode(struct mbuf **ptr, int *iptr);
  253 static void     print_in_addr(struct in_addr addr);
  254 static void     print_sin_addr(struct sockaddr_in *addr);
  255 static void     clear_sinaddr(struct sockaddr_in *sin);
  256 static void     allocifctx(struct bootpc_globalcontext *gctx);
  257 static void     bootpc_compose_query(struct bootpc_ifcontext *ifctx,
  258                     struct thread *td);
  259 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
  260                     struct bootp_packet *bp, int len, int tag);
  261 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
  262                     unsigned char *start, int len, int tag);
  263 
  264 #ifdef BOOTP_DEBUG
  265 void bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma);
  266 void bootpboot_p_rtentry(struct rtentry *rt);
  267 void bootpboot_p_tree(struct radix_node *rn);
  268 void bootpboot_p_rtlist(void);
  269 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
  270 void bootpboot_p_iflist(void);
  271 #endif
  272 
  273 static int      bootpc_call(struct bootpc_globalcontext *gctx,
  274                     struct thread *td);
  275 
  276 static void     bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
  277                     struct thread *td);
  278 
  279 static void     bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
  280                     struct bootpc_globalcontext *gctx, struct thread *td);
  281 
  282 static void     bootpc_decode_reply(struct nfsv3_diskless *nd,
  283                     struct bootpc_ifcontext *ifctx,
  284                     struct bootpc_globalcontext *gctx);
  285 
  286 static int      bootpc_received(struct bootpc_globalcontext *gctx,
  287                     struct bootpc_ifcontext *ifctx);
  288 
  289 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
  290 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
  291 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);
  292 
  293 /*
  294  * In order to have multiple active interfaces with address 0.0.0.0
  295  * and be able to send data to a selected interface, we first set
  296  * mask to /8 on all interfaces, and temporarily set it to /0 when
  297  * doing sosend().
  298  */
  299 
  300 #ifdef BOOTP_DEBUG
  301 void
  302 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma)
  303 {
  304 
  305         if (sa == NULL) {
  306                 printf("(sockaddr *) <null>");
  307                 return;
  308         }
  309         switch (sa->sa_family) {
  310         case AF_INET:
  311         {
  312                 struct sockaddr_in *sin;
  313 
  314                 sin = (struct sockaddr_in *) sa;
  315                 printf("inet ");
  316                 print_sin_addr(sin);
  317                 if (ma != NULL) {
  318                         sin = (struct sockaddr_in *) ma;
  319                         printf(" mask ");
  320                         print_sin_addr(sin);
  321                 }
  322         }
  323         break;
  324         case AF_LINK:
  325         {
  326                 struct sockaddr_dl *sli;
  327                 int i;
  328 
  329                 sli = (struct sockaddr_dl *) sa;
  330                 printf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
  331                 for (i = 0; i < sli->sdl_alen; i++) {
  332                         if (i > 0)
  333                                 printf(":");
  334                         printf("%x", ((unsigned char *) LLADDR(sli))[i]);
  335                 }
  336         }
  337         break;
  338         default:
  339                 printf("af%d", sa->sa_family);
  340         }
  341 }
  342 
  343 void
  344 bootpboot_p_rtentry(struct rtentry *rt)
  345 {
  346 
  347         bootpboot_p_sa(rt_key(rt), rt_mask(rt));
  348         printf(" ");
  349         bootpboot_p_sa(rt->rt_gateway, NULL);
  350         printf(" ");
  351         printf("flags %x", (unsigned short) rt->rt_flags);
  352         printf(" %d", (int) rt->rt_expire);
  353         printf(" %s\n", rt->rt_ifp->if_xname);
  354 }
  355 
  356 void
  357 bootpboot_p_tree(struct radix_node *rn)
  358 {
  359 
  360         while (rn != NULL) {
  361                 if (rn->rn_bit < 0) {
  362                         if ((rn->rn_flags & RNF_ROOT) != 0) {
  363                         } else {
  364                                 bootpboot_p_rtentry((struct rtentry *) rn);
  365                         }
  366                         rn = rn->rn_dupedkey;
  367                 } else {
  368                         bootpboot_p_tree(rn->rn_left);
  369                         bootpboot_p_tree(rn->rn_right);
  370                         return;
  371                 }
  372         }
  373 }
  374 
  375 void
  376 bootpboot_p_rtlist(void)
  377 {
  378         struct rib_head *rnh;
  379 
  380         printf("Routing table:\n");
  381         rnh = rt_tables_get_rnh(0, AF_INET);
  382         if (rnh == NULL)
  383                 return;
  384         RIB_RLOCK(rnh); /* could sleep XXX */
  385         bootpboot_p_tree(rnh->rnh_treetop);
  386         RIB_RUNLOCK(rnh);
  387 }
  388 
  389 void
  390 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
  391 {
  392 
  393         printf("%s flags %x, addr ",
  394                ifp->if_xname, ifp->if_flags);
  395         print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
  396         printf(", broadcast ");
  397         print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
  398         printf(", netmask ");
  399         print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
  400         printf("\n");
  401 }
  402 
  403 void
  404 bootpboot_p_iflist(void)
  405 {
  406         struct ifnet *ifp;
  407         struct ifaddr *ifa;
  408 
  409         printf("Interface list:\n");
  410         IFNET_RLOCK();
  411         for (ifp = TAILQ_FIRST(&V_ifnet);
  412              ifp != NULL;
  413              ifp = TAILQ_NEXT(ifp, if_link)) {
  414                 for (ifa = TAILQ_FIRST(&ifp->if_addrhead);
  415                      ifa != NULL;
  416                      ifa = TAILQ_NEXT(ifa, ifa_link))
  417                         if (ifa->ifa_addr->sa_family == AF_INET)
  418                                 bootpboot_p_if(ifp, ifa);
  419         }
  420         IFNET_RUNLOCK();
  421 }
  422 #endif /* defined(BOOTP_DEBUG) */
  423 
  424 static void
  425 clear_sinaddr(struct sockaddr_in *sin)
  426 {
  427 
  428         bzero(sin, sizeof(*sin));
  429         sin->sin_len = sizeof(*sin);
  430         sin->sin_family = AF_INET;
  431         sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
  432         sin->sin_port = 0;
  433 }
  434 
  435 static void
  436 allocifctx(struct bootpc_globalcontext *gctx)
  437 {
  438         struct bootpc_ifcontext *ifctx;
  439 
  440         ifctx = malloc(sizeof(*ifctx), M_TEMP, M_WAITOK | M_ZERO);
  441         ifctx->xid = gctx->xid;
  442 #ifdef BOOTP_NO_DHCP
  443         ifctx->state = IF_BOOTP_UNRESOLVED;
  444 #else
  445         ifctx->state = IF_DHCP_UNRESOLVED;
  446 #endif
  447         gctx->xid += 0x100;
  448         STAILQ_INSERT_TAIL(&gctx->interfaces, ifctx, next);
  449 }
  450 
  451 static __inline int
  452 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
  453 {
  454 
  455         if (ifctx->state == IF_BOOTP_RESOLVED ||
  456             ifctx->state == IF_DHCP_RESOLVED)
  457                 return 1;
  458         return 0;
  459 }
  460 
  461 static __inline int
  462 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
  463 {
  464 
  465         if (ifctx->state == IF_BOOTP_UNRESOLVED ||
  466             ifctx->state == IF_DHCP_UNRESOLVED)
  467                 return 1;
  468         return 0;
  469 }
  470 
  471 static __inline int
  472 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
  473 {
  474 
  475         if (ifctx->state == IF_BOOTP_FAILED ||
  476             ifctx->state == IF_DHCP_FAILED)
  477                 return 1;
  478         return 0;
  479 }
  480 
  481 static int
  482 bootpc_received(struct bootpc_globalcontext *gctx,
  483     struct bootpc_ifcontext *ifctx)
  484 {
  485         unsigned char dhcpreplytype;
  486         char *p;
  487 
  488         /*
  489          * Need timeout for fallback to less
  490          * desirable alternative.
  491          */
  492 
  493         /* This call used for the side effect (badopt flag) */
  494         (void) bootpc_tag(&gctx->tmptag, &gctx->reply,
  495                           gctx->replylen,
  496                           TAG_END);
  497 
  498         /* If packet is invalid, ignore it */
  499         if (gctx->tmptag.badopt != 0)
  500                 return 0;
  501 
  502         p = bootpc_tag(&gctx->tmptag, &gctx->reply,
  503                        gctx->replylen, TAG_DHCP_MSGTYPE);
  504         if (p != NULL)
  505                 dhcpreplytype = *p;
  506         else
  507                 dhcpreplytype = DHCP_NOMSG;
  508 
  509         switch (ifctx->dhcpquerytype) {
  510         case DHCP_DISCOVER:
  511                 if (dhcpreplytype != DHCP_OFFER         /* Normal DHCP offer */
  512 #ifndef BOOTP_FORCE_DHCP
  513                     && dhcpreplytype != DHCP_NOMSG      /* Fallback to BOOTP */
  514 #endif
  515                         )
  516                         return 0;
  517                 break;
  518         case DHCP_REQUEST:
  519                 if (dhcpreplytype != DHCP_ACK)
  520                         return 0;
  521         case DHCP_NOMSG:
  522                 break;
  523         }
  524 
  525         /* Ignore packet unless it gives us a root tag we didn't have */
  526 
  527         if ((ifctx->state == IF_BOOTP_RESOLVED ||
  528              (ifctx->dhcpquerytype == DHCP_DISCOVER &&
  529               (ifctx->state == IF_DHCP_OFFERED ||
  530                ifctx->state == IF_DHCP_RESOLVED))) &&
  531             (bootpc_tag(&gctx->tmptag, &ifctx->reply,
  532                         ifctx->replylen,
  533                         TAG_ROOT) != NULL ||
  534              bootpc_tag(&gctx->tmptag, &gctx->reply,
  535                         gctx->replylen,
  536                         TAG_ROOT) == NULL))
  537                 return 0;
  538 
  539         bcopy(&gctx->reply, &ifctx->reply, gctx->replylen);
  540         ifctx->replylen = gctx->replylen;
  541 
  542         /* XXX: Only reset if 'perfect' response */
  543         if (ifctx->state == IF_BOOTP_UNRESOLVED)
  544                 ifctx->state = IF_BOOTP_RESOLVED;
  545         else if (ifctx->state == IF_DHCP_UNRESOLVED &&
  546                  ifctx->dhcpquerytype == DHCP_DISCOVER) {
  547                 if (dhcpreplytype == DHCP_OFFER)
  548                         ifctx->state = IF_DHCP_OFFERED;
  549                 else
  550                         ifctx->state = IF_BOOTP_RESOLVED;       /* Fallback */
  551         } else if (ifctx->state == IF_DHCP_OFFERED &&
  552                    ifctx->dhcpquerytype == DHCP_REQUEST)
  553                 ifctx->state = IF_DHCP_RESOLVED;
  554 
  555 
  556         if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
  557             ifctx->state != IF_BOOTP_RESOLVED) {
  558                 p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
  559                                ifctx->replylen, TAG_DHCP_SERVERID);
  560                 if (p != NULL && gctx->tmptag.taglen == 4) {
  561                         memcpy(&ifctx->dhcpserver, p, 4);
  562                         ifctx->gotdhcpserver = 1;
  563                 } else
  564                         ifctx->gotdhcpserver = 0;
  565                 return 1;
  566         }
  567 
  568         ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
  569                                          ifctx->replylen,
  570                                          TAG_ROOT) != NULL);
  571         ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
  572                                    ifctx->replylen,
  573                                    TAG_ROUTERS) != NULL);
  574         ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
  575                                         ifctx->replylen,
  576                                         TAG_SUBNETMASK) != NULL);
  577         return 1;
  578 }
  579 
  580 static int
  581 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td)
  582 {
  583         struct sockaddr_in *sin, dst;
  584         struct uio auio;
  585         struct sockopt sopt;
  586         struct iovec aio;
  587         int error, on, rcvflg, timo, len;
  588         time_t atimo;
  589         time_t rtimo;
  590         struct timeval tv;
  591         struct bootpc_ifcontext *ifctx;
  592         int outstanding;
  593         int gotrootpath;
  594         int retry;
  595         const char *s;
  596 
  597         tv.tv_sec = 1;
  598         tv.tv_usec = 0;
  599         bzero(&sopt, sizeof(sopt));
  600         sopt.sopt_dir = SOPT_SET;
  601         sopt.sopt_level = SOL_SOCKET;
  602         sopt.sopt_name = SO_RCVTIMEO;
  603         sopt.sopt_val = &tv;
  604         sopt.sopt_valsize = sizeof tv;
  605 
  606         error = sosetopt(bootp_so, &sopt);
  607         if (error != 0)
  608                 goto out;
  609 
  610         /*
  611          * Enable broadcast.
  612          */
  613         on = 1;
  614         sopt.sopt_name = SO_BROADCAST;
  615         sopt.sopt_val = &on;
  616         sopt.sopt_valsize = sizeof on;
  617 
  618         error = sosetopt(bootp_so, &sopt);
  619         if (error != 0)
  620                 goto out;
  621 
  622         /*
  623          * Disable routing.
  624          */
  625 
  626         on = 1;
  627         sopt.sopt_name = SO_DONTROUTE;
  628         sopt.sopt_val = &on;
  629         sopt.sopt_valsize = sizeof on;
  630 
  631         error = sosetopt(bootp_so, &sopt);
  632         if (error != 0)
  633                 goto out;
  634 
  635         /*
  636          * Bind the local endpoint to a bootp client port.
  637          */
  638         sin = &dst;
  639         clear_sinaddr(sin);
  640         sin->sin_port = htons(IPPORT_BOOTPC);
  641         error = sobind(bootp_so, (struct sockaddr *)sin, td);
  642         if (error != 0) {
  643                 printf("bind failed\n");
  644                 goto out;
  645         }
  646 
  647         /*
  648          * Setup socket address for the server.
  649          */
  650         sin = &dst;
  651         clear_sinaddr(sin);
  652         sin->sin_addr.s_addr = INADDR_BROADCAST;
  653         sin->sin_port = htons(IPPORT_BOOTPS);
  654 
  655         /*
  656          * Send it, repeatedly, until a reply is received,
  657          * but delay each re-send by an increasing amount.
  658          * If the delay hits the maximum, start complaining.
  659          */
  660         timo = 0;
  661         rtimo = 0;
  662         for (;;) {
  663 
  664                 outstanding = 0;
  665                 gotrootpath = 0;
  666 
  667                 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) {
  668                         if (bootpc_ifctx_isresolved(ifctx) != 0 &&
  669                             bootpc_tag(&gctx->tmptag, &ifctx->reply,
  670                                        ifctx->replylen,
  671                                        TAG_ROOT) != NULL)
  672                                 gotrootpath = 1;
  673                 }
  674 
  675                 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) {
  676                         struct in_aliasreq *ifra = &ifctx->iareq;
  677                         sin = (struct sockaddr_in *)&ifra->ifra_mask;
  678 
  679                         ifctx->outstanding = 0;
  680                         if (bootpc_ifctx_isresolved(ifctx)  != 0 &&
  681                             gotrootpath != 0) {
  682                                 continue;
  683                         }
  684                         if (bootpc_ifctx_isfailed(ifctx) != 0)
  685                                 continue;
  686 
  687                         outstanding++;
  688                         ifctx->outstanding = 1;
  689 
  690                         /* Proceed to next step in DHCP negotiation */
  691                         if ((ifctx->state == IF_DHCP_OFFERED &&
  692                              ifctx->dhcpquerytype != DHCP_REQUEST) ||
  693                             (ifctx->state == IF_DHCP_UNRESOLVED &&
  694                              ifctx->dhcpquerytype != DHCP_DISCOVER) ||
  695                             (ifctx->state == IF_BOOTP_UNRESOLVED &&
  696                              ifctx->dhcpquerytype != DHCP_NOMSG)) {
  697                                 ifctx->sentmsg = 0;
  698                                 bootpc_compose_query(ifctx, td);
  699                         }
  700 
  701                         /* Send BOOTP request (or re-send). */
  702 
  703                         if (ifctx->sentmsg == 0) {
  704                                 switch(ifctx->dhcpquerytype) {
  705                                 case DHCP_DISCOVER:
  706                                         s = "DHCP Discover";
  707                                         break;
  708                                 case DHCP_REQUEST:
  709                                         s = "DHCP Request";
  710                                         break;
  711                                 case DHCP_NOMSG:
  712                                 default:
  713                                         s = "BOOTP Query";
  714                                         break;
  715                                 }
  716                                 printf("Sending %s packet from "
  717                                        "interface %s (%*D)\n",
  718                                        s,
  719                                        ifctx->ireq.ifr_name,
  720                                        ifctx->sdl->sdl_alen,
  721                                        (unsigned char *) LLADDR(ifctx->sdl),
  722                                        ":");
  723                                 ifctx->sentmsg = 1;
  724                         }
  725 
  726                         aio.iov_base = (caddr_t) &ifctx->call;
  727                         aio.iov_len = sizeof(ifctx->call);
  728 
  729                         auio.uio_iov = &aio;
  730                         auio.uio_iovcnt = 1;
  731                         auio.uio_segflg = UIO_SYSSPACE;
  732                         auio.uio_rw = UIO_WRITE;
  733                         auio.uio_offset = 0;
  734                         auio.uio_resid = sizeof(ifctx->call);
  735                         auio.uio_td = td;
  736 
  737                         /* Set netmask to 0.0.0.0 */
  738                         clear_sinaddr(sin);
  739                         error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra,
  740                             td);
  741                         if (error != 0)
  742                                 panic("%s: SIOCAIFADDR, error=%d", __func__,
  743                                     error);
  744 
  745                         error = sosend(bootp_so, (struct sockaddr *) &dst,
  746                                        &auio, NULL, NULL, 0, td);
  747                         if (error != 0)
  748                                 printf("%s: sosend: %d state %08x\n", __func__,
  749                                     error, (int )bootp_so->so_state);
  750 
  751                         /* Set netmask to 255.0.0.0 */
  752                         sin->sin_addr.s_addr = htonl(IN_CLASSA_NET);
  753                         error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra,
  754                             td);
  755                         if (error != 0)
  756                                 panic("%s: SIOCAIFADDR, error=%d", __func__,
  757                                     error);
  758                 }
  759 
  760                 if (outstanding == 0 &&
  761                     (rtimo == 0 || time_second >= rtimo)) {
  762                         error = 0;
  763                         goto out;
  764                 }
  765 
  766                 /* Determine new timeout. */
  767                 if (timo < MAX_RESEND_DELAY)
  768                         timo++;
  769                 else {
  770                         printf("DHCP/BOOTP timeout for server ");
  771                         print_sin_addr(&dst);
  772                         printf("\n");
  773                 }
  774 
  775                 /*
  776                  * Wait for up to timo seconds for a reply.
  777                  * The socket receive timeout was set to 1 second.
  778                  */
  779                 atimo = timo + time_second;
  780                 while (time_second < atimo) {
  781                         aio.iov_base = (caddr_t) &gctx->reply;
  782                         aio.iov_len = sizeof(gctx->reply);
  783 
  784                         auio.uio_iov = &aio;
  785                         auio.uio_iovcnt = 1;
  786                         auio.uio_segflg = UIO_SYSSPACE;
  787                         auio.uio_rw = UIO_READ;
  788                         auio.uio_offset = 0;
  789                         auio.uio_resid = sizeof(gctx->reply);
  790                         auio.uio_td = td;
  791 
  792                         rcvflg = 0;
  793                         error = soreceive(bootp_so, NULL, &auio,
  794                                           NULL, NULL, &rcvflg);
  795                         gctx->secs = time_second - gctx->starttime;
  796                         STAILQ_FOREACH(ifctx, &gctx->interfaces, next) {
  797                                 if (bootpc_ifctx_isresolved(ifctx) != 0 ||
  798                                     bootpc_ifctx_isfailed(ifctx) != 0)
  799                                         continue;
  800 
  801                                 ifctx->call.secs = htons(gctx->secs);
  802                         }
  803                         if (error == EWOULDBLOCK)
  804                                 continue;
  805                         if (error != 0)
  806                                 goto out;
  807                         len = sizeof(gctx->reply) - auio.uio_resid;
  808 
  809                         /* Do we have the required number of bytes ? */
  810                         if (len < BOOTP_MIN_LEN)
  811                                 continue;
  812                         gctx->replylen = len;
  813 
  814                         /* Is it a reply? */
  815                         if (gctx->reply.op != BOOTP_REPLY)
  816                                 continue;
  817 
  818                         /* Is this an answer to our query */
  819                         STAILQ_FOREACH(ifctx, &gctx->interfaces, next) {
  820                                 if (gctx->reply.xid != ifctx->call.xid)
  821                                         continue;
  822 
  823                                 /* Same HW address size ? */
  824                                 if (gctx->reply.hlen != ifctx->call.hlen)
  825                                         continue;
  826 
  827                                 /* Correct HW address ? */
  828                                 if (bcmp(gctx->reply.chaddr,
  829                                          ifctx->call.chaddr,
  830                                          ifctx->call.hlen) != 0)
  831                                         continue;
  832 
  833                                 break;
  834                         }
  835 
  836                         if (ifctx != NULL) {
  837                                 s =  bootpc_tag(&gctx->tmptag,
  838                                                 &gctx->reply,
  839                                                 gctx->replylen,
  840                                                 TAG_DHCP_MSGTYPE);
  841                                 if (s != NULL) {
  842                                         switch (*s) {
  843                                         case DHCP_OFFER:
  844                                                 s = "DHCP Offer";
  845                                                 break;
  846                                         case DHCP_ACK:
  847                                                 s = "DHCP Ack";
  848                                                 break;
  849                                         default:
  850                                                 s = "DHCP (unexpected)";
  851                                                 break;
  852                                         }
  853                                 } else
  854                                         s = "BOOTP Reply";
  855 
  856                                 printf("Received %s packet"
  857                                        " on %s from ",
  858                                        s,
  859                                        ifctx->ireq.ifr_name);
  860                                 print_in_addr(gctx->reply.siaddr);
  861                                 if (gctx->reply.giaddr.s_addr !=
  862                                     htonl(INADDR_ANY)) {
  863                                         printf(" via ");
  864                                         print_in_addr(gctx->reply.giaddr);
  865                                 }
  866                                 if (bootpc_received(gctx, ifctx) != 0) {
  867                                         printf(" (accepted)");
  868                                         if (ifctx->outstanding) {
  869                                                 ifctx->outstanding = 0;
  870                                                 outstanding--;
  871                                         }
  872                                         /* Network settle delay */
  873                                         if (outstanding == 0)
  874                                                 atimo = time_second +
  875                                                         BOOTP_SETTLE_DELAY;
  876                                 } else
  877                                         printf(" (ignored)");
  878                                 if (ifctx->gotrootpath || 
  879                                     gctx->any_root_overrides) {
  880                                         gotrootpath = 1;
  881                                         rtimo = time_second +
  882                                                 BOOTP_SETTLE_DELAY;
  883                                         if (ifctx->gotrootpath)
  884                                                 printf(" (got root path)");
  885                                 }
  886                                 printf("\n");
  887                         }
  888                 } /* while secs */
  889 #ifdef BOOTP_TIMEOUT
  890                 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
  891                         break;
  892 #endif
  893                 /* Force a retry if halfway in DHCP negotiation */
  894                 retry = 0;
  895                 STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
  896                         if (ifctx->state == IF_DHCP_OFFERED) {
  897                                 if (ifctx->dhcpquerytype == DHCP_DISCOVER)
  898                                         retry = 1;
  899                                 else
  900                                         ifctx->state = IF_DHCP_UNRESOLVED;
  901                         }
  902 
  903                 if (retry != 0)
  904                         continue;
  905 
  906                 if (gotrootpath != 0) {
  907                         gctx->gotrootpath = gotrootpath;
  908                         if (rtimo != 0 && time_second >= rtimo)
  909                                 break;
  910                 }
  911         } /* forever send/receive */
  912 
  913         /*
  914          * XXX: These are errors of varying seriousness being silently
  915          * ignored
  916          */
  917 
  918         STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
  919                 if (bootpc_ifctx_isresolved(ifctx) == 0) {
  920                         printf("%s timeout for interface %s\n",
  921                                ifctx->dhcpquerytype != DHCP_NOMSG ?
  922                                "DHCP" : "BOOTP",
  923                                ifctx->ireq.ifr_name);
  924                 }
  925 
  926         if (gctx->gotrootpath != 0) {
  927 #if 0
  928                 printf("Got a root path, ignoring remaining timeout\n");
  929 #endif
  930                 error = 0;
  931                 goto out;
  932         }
  933 #ifndef BOOTP_NFSROOT
  934         STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
  935                 if (bootpc_ifctx_isresolved(ifctx) != 0) {
  936                         error = 0;
  937                         goto out;
  938                 }
  939 #endif
  940         error = ETIMEDOUT;
  941 
  942 out:
  943         return (error);
  944 }
  945 
  946 static void
  947 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, struct thread *td)
  948 {
  949         struct ifreq *ifr;
  950         struct in_aliasreq *ifra;
  951         struct sockaddr_in *sin;
  952         int error;
  953 
  954         ifr = &ifctx->ireq;
  955         ifra = &ifctx->iareq;
  956 
  957         /*
  958          * Bring up the interface.
  959          *
  960          * Get the old interface flags and or IFF_UP into them; if
  961          * IFF_UP set blindly, interface selection can be clobbered.
  962          */
  963         error = ifioctl(bootp_so, SIOCGIFFLAGS, (caddr_t)ifr, td);
  964         if (error != 0)
  965                 panic("%s: SIOCGIFFLAGS, error=%d", __func__, error);
  966         ifr->ifr_flags |= IFF_UP;
  967         error = ifioctl(bootp_so, SIOCSIFFLAGS, (caddr_t)ifr, td);
  968         if (error != 0)
  969                 panic("%s: SIOCSIFFLAGS, error=%d", __func__, error);
  970 
  971         /*
  972          * Do enough of ifconfig(8) so that the chosen interface
  973          * can talk to the servers. Set address to 0.0.0.0/8 and
  974          * broadcast address to local broadcast.
  975          */
  976         sin = (struct sockaddr_in *)&ifra->ifra_addr;
  977         clear_sinaddr(sin);
  978         sin = (struct sockaddr_in *)&ifra->ifra_mask;
  979         clear_sinaddr(sin);
  980         sin->sin_addr.s_addr = htonl(IN_CLASSA_NET);
  981         sin = (struct sockaddr_in *)&ifra->ifra_broadaddr;
  982         clear_sinaddr(sin);
  983         sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
  984         error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, td);
  985         if (error != 0)
  986                 panic("%s: SIOCAIFADDR, error=%d", __func__, error);
  987 }
  988 
  989 static void
  990 bootpc_shutdown_interface(struct bootpc_ifcontext *ifctx, struct thread *td)
  991 {
  992         struct ifreq *ifr;
  993         struct sockaddr_in *sin;
  994         int error;
  995 
  996         ifr = &ifctx->ireq;
  997 
  998         printf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
  999         error = ifioctl(bootp_so, SIOCGIFFLAGS, (caddr_t)ifr, td);
 1000         if (error != 0)
 1001                 panic("%s: SIOCGIFFLAGS, error=%d", __func__, error);
 1002         ifr->ifr_flags &= ~IFF_UP;
 1003         error = ifioctl(bootp_so, SIOCSIFFLAGS, (caddr_t)ifr, td);
 1004         if (error != 0)
 1005                 panic("%s: SIOCSIFFLAGS, error=%d", __func__, error);
 1006 
 1007         sin = (struct sockaddr_in *) &ifr->ifr_addr;
 1008         clear_sinaddr(sin);
 1009         error = ifioctl(bootp_so, SIOCDIFADDR, (caddr_t) ifr, td);
 1010         if (error != 0)
 1011                 panic("%s: SIOCDIFADDR, error=%d", __func__, error);
 1012 }
 1013 
 1014 static void
 1015 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
 1016     struct bootpc_globalcontext *gctx, struct thread *td)
 1017 {
 1018         int error;
 1019         struct sockaddr_in *sin;
 1020         struct ifreq *ifr;
 1021         struct in_aliasreq *ifra;
 1022         struct sockaddr_in *myaddr;
 1023         struct sockaddr_in *netmask;
 1024 
 1025         ifr = &ifctx->ireq;
 1026         ifra = &ifctx->iareq;
 1027         myaddr = &ifctx->myaddr;
 1028         netmask = &ifctx->netmask;
 1029 
 1030         if (bootpc_ifctx_isresolved(ifctx) == 0) {
 1031                 /* Shutdown interfaces where BOOTP failed */
 1032                 bootpc_shutdown_interface(ifctx, td);
 1033                 return;
 1034         }
 1035 
 1036         printf("Adjusted interface %s", ifctx->ireq.ifr_name);
 1037 
 1038         /* Do BOOTP interface options */
 1039         if (ifctx->mtu != 0) {
 1040                 printf(" (MTU=%d%s)", ifctx->mtu, 
 1041                     (ifctx->mtu > 1514) ? "/JUMBO" : "");
 1042                 ifr->ifr_mtu = ifctx->mtu;
 1043                 error = ifioctl(bootp_so, SIOCSIFMTU, (caddr_t) ifr, td);
 1044                 if (error != 0)
 1045                         panic("%s: SIOCSIFMTU, error=%d", __func__, error);
 1046         }
 1047         printf("\n");
 1048 
 1049         /*
 1050          * Do enough of ifconfig(8) so that the chosen interface
 1051          * can talk to the servers.  (just set the address)
 1052          */
 1053         sin = (struct sockaddr_in *) &ifr->ifr_addr;
 1054         clear_sinaddr(sin);
 1055         error = ifioctl(bootp_so, SIOCDIFADDR, (caddr_t) ifr, td);
 1056         if (error != 0)
 1057                 panic("%s: SIOCDIFADDR, error=%d", __func__, error);
 1058 
 1059         bcopy(myaddr, &ifra->ifra_addr, sizeof(*myaddr));
 1060         bcopy(netmask, &ifra->ifra_mask, sizeof(*netmask));
 1061         clear_sinaddr(&ifra->ifra_broadaddr);
 1062         ifra->ifra_broadaddr.sin_addr.s_addr = myaddr->sin_addr.s_addr |
 1063             ~netmask->sin_addr.s_addr;
 1064 
 1065         error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, td);
 1066         if (error != 0)
 1067                 panic("%s: SIOCAIFADDR, error=%d", __func__, error);
 1068 }
 1069 
 1070 static void
 1071 bootpc_add_default_route(struct bootpc_ifcontext *ifctx)
 1072 {
 1073         int error;
 1074         struct sockaddr_in defdst;
 1075         struct sockaddr_in defmask;
 1076 
 1077         if (ifctx->gw.sin_addr.s_addr == htonl(INADDR_ANY))
 1078                 return;
 1079 
 1080         clear_sinaddr(&defdst);
 1081         clear_sinaddr(&defmask);
 1082 
 1083         error = rtrequest_fib(RTM_ADD, (struct sockaddr *)&defdst,
 1084             (struct sockaddr *) &ifctx->gw, (struct sockaddr *)&defmask,
 1085             (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL, RT_DEFAULT_FIB);
 1086         if (error != 0) {
 1087                 printf("%s: RTM_ADD, error=%d\n", __func__, error);
 1088         }
 1089 }
 1090 
 1091 static void
 1092 bootpc_remove_default_route(struct bootpc_ifcontext *ifctx)
 1093 {
 1094         int error;
 1095         struct sockaddr_in defdst;
 1096         struct sockaddr_in defmask;
 1097 
 1098         if (ifctx->gw.sin_addr.s_addr == htonl(INADDR_ANY))
 1099                 return;
 1100 
 1101         clear_sinaddr(&defdst);
 1102         clear_sinaddr(&defmask);
 1103 
 1104         error = rtrequest_fib(RTM_DELETE, (struct sockaddr *)&defdst,
 1105             (struct sockaddr *) &ifctx->gw, (struct sockaddr *)&defmask,
 1106             (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL, RT_DEFAULT_FIB);
 1107         if (error != 0) {
 1108                 printf("%s: RTM_DELETE, error=%d\n", __func__, error);
 1109         }
 1110 }
 1111 
 1112 static int
 1113 setfs(struct sockaddr_in *addr, char *path, char *p,
 1114     const struct in_addr *siaddr)
 1115 {
 1116 
 1117         if (getip(&p, &addr->sin_addr) == 0) {
 1118                 if (siaddr != NULL && *p == '/')
 1119                         bcopy(siaddr, &addr->sin_addr, sizeof(struct in_addr));
 1120                 else
 1121                         return 0;
 1122         } else {
 1123                 if (*p != ':')
 1124                         return 0;
 1125                 p++;
 1126         }
 1127                 
 1128         addr->sin_len = sizeof(struct sockaddr_in);
 1129         addr->sin_family = AF_INET;
 1130 
 1131         strlcpy(path, p, MNAMELEN);
 1132         return 1;
 1133 }
 1134 
 1135 static int
 1136 getip(char **ptr, struct in_addr *addr)
 1137 {
 1138         char *p;
 1139         unsigned int ip;
 1140         int val;
 1141 
 1142         p = *ptr;
 1143         ip = 0;
 1144         if (((val = getdec(&p)) < 0) || (val > 255))
 1145                 return 0;
 1146         ip = val << 24;
 1147         if (*p != '.')
 1148                 return 0;
 1149         p++;
 1150         if (((val = getdec(&p)) < 0) || (val > 255))
 1151                 return 0;
 1152         ip |= (val << 16);
 1153         if (*p != '.')
 1154                 return 0;
 1155         p++;
 1156         if (((val = getdec(&p)) < 0) || (val > 255))
 1157                 return 0;
 1158         ip |= (val << 8);
 1159         if (*p != '.')
 1160                 return 0;
 1161         p++;
 1162         if (((val = getdec(&p)) < 0) || (val > 255))
 1163                 return 0;
 1164         ip |= val;
 1165 
 1166         addr->s_addr = htonl(ip);
 1167         *ptr = p;
 1168         return 1;
 1169 }
 1170 
 1171 static int
 1172 getdec(char **ptr)
 1173 {
 1174         char *p;
 1175         int ret;
 1176 
 1177         p = *ptr;
 1178         ret = 0;
 1179         if ((*p < '') || (*p > '9'))
 1180                 return -1;
 1181         while ((*p >= '') && (*p <= '9')) {
 1182                 ret = ret * 10 + (*p - '');
 1183                 p++;
 1184         }
 1185         *ptr = p;
 1186         return ret;
 1187 }
 1188 
 1189 static void
 1190 mountopts(struct nfs_args *args, char *p)
 1191 {
 1192         args->version = NFS_ARGSVERSION;
 1193         args->rsize = BOOTP_BLOCKSIZE;
 1194         args->wsize = BOOTP_BLOCKSIZE;
 1195         args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT;
 1196         args->sotype = SOCK_DGRAM;
 1197         if (p != NULL)
 1198                 nfs_parse_options(p, args);
 1199 }
 1200 
 1201 static int
 1202 xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len)
 1203 {
 1204         struct mbuf *m;
 1205         int alignedlen;
 1206 
 1207         m = *mptr;
 1208         alignedlen = ( len + 3 ) & ~3;
 1209 
 1210         if (m->m_len < alignedlen) {
 1211                 m = m_pullup(m, alignedlen);
 1212                 if (m == NULL) {
 1213                         *mptr = NULL;
 1214                         return EBADRPC;
 1215                 }
 1216         }
 1217         bcopy(mtod(m, u_char *), buf, len);
 1218         m_adj(m, alignedlen);
 1219         *mptr = m;
 1220         return 0;
 1221 }
 1222 
 1223 static int
 1224 xdr_int_decode(struct mbuf **mptr, int *iptr)
 1225 {
 1226         u_int32_t i;
 1227 
 1228         if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0)
 1229                 return EBADRPC;
 1230         *iptr = fxdr_unsigned(u_int32_t, i);
 1231         return 0;
 1232 }
 1233 
 1234 static void
 1235 print_sin_addr(struct sockaddr_in *sin)
 1236 {
 1237 
 1238         print_in_addr(sin->sin_addr);
 1239 }
 1240 
 1241 static void
 1242 print_in_addr(struct in_addr addr)
 1243 {
 1244         unsigned int ip;
 1245 
 1246         ip = ntohl(addr.s_addr);
 1247         printf("%d.%d.%d.%d",
 1248                ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
 1249 }
 1250 
 1251 static void
 1252 bootpc_compose_query(struct bootpc_ifcontext *ifctx, struct thread *td)
 1253 {
 1254         unsigned char *vendp;
 1255         unsigned char vendor_client[64];
 1256         uint32_t leasetime;
 1257         uint8_t vendor_client_len;
 1258 
 1259         ifctx->gotrootpath = 0;
 1260 
 1261         bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
 1262 
 1263         /* bootpc part */
 1264         ifctx->call.op = BOOTP_REQUEST;         /* BOOTREQUEST */
 1265         ifctx->call.htype = 1;                  /* 10mb ethernet */
 1266         ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
 1267         ifctx->call.hops = 0;
 1268         if (bootpc_ifctx_isunresolved(ifctx) != 0)
 1269                 ifctx->xid++;
 1270         ifctx->call.xid = txdr_unsigned(ifctx->xid);
 1271         bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
 1272 
 1273         vendp = ifctx->call.vend;
 1274         *vendp++ = 99;          /* RFC1048 cookie */
 1275         *vendp++ = 130;
 1276         *vendp++ = 83;
 1277         *vendp++ = 99;
 1278         *vendp++ = TAG_MAXMSGSIZE;
 1279         *vendp++ = 2;
 1280         *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
 1281         *vendp++ = sizeof(struct bootp_packet) & 255;
 1282 
 1283         snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
 1284                 ostype, MACHINE, osrelease);
 1285         vendor_client_len = strlen(vendor_client);
 1286         *vendp++ = TAG_VENDOR_INDENTIFIER;
 1287         *vendp++ = vendor_client_len;
 1288         memcpy(vendp, vendor_client, vendor_client_len);
 1289         vendp += vendor_client_len;
 1290         ifctx->dhcpquerytype = DHCP_NOMSG;
 1291         switch (ifctx->state) {
 1292         case IF_DHCP_UNRESOLVED:
 1293                 *vendp++ = TAG_DHCP_MSGTYPE;
 1294                 *vendp++ = 1;
 1295                 *vendp++ = DHCP_DISCOVER;
 1296                 ifctx->dhcpquerytype = DHCP_DISCOVER;
 1297                 ifctx->gotdhcpserver = 0;
 1298                 break;
 1299         case IF_DHCP_OFFERED:
 1300                 *vendp++ = TAG_DHCP_MSGTYPE;
 1301                 *vendp++ = 1;
 1302                 *vendp++ = DHCP_REQUEST;
 1303                 ifctx->dhcpquerytype = DHCP_REQUEST;
 1304                 *vendp++ = TAG_DHCP_REQ_ADDR;
 1305                 *vendp++ = 4;
 1306                 memcpy(vendp, &ifctx->reply.yiaddr, 4);
 1307                 vendp += 4;
 1308                 if (ifctx->gotdhcpserver != 0) {
 1309                         *vendp++ = TAG_DHCP_SERVERID;
 1310                         *vendp++ = 4;
 1311                         memcpy(vendp, &ifctx->dhcpserver, 4);
 1312                         vendp += 4;
 1313                 }
 1314                 *vendp++ = TAG_DHCP_LEASETIME;
 1315                 *vendp++ = 4;
 1316                 leasetime = htonl(300);
 1317                 memcpy(vendp, &leasetime, 4);
 1318                 vendp += 4;
 1319                 break;
 1320         default:
 1321                 break;
 1322         }
 1323         *vendp = TAG_END;
 1324 
 1325         ifctx->call.secs = 0;
 1326         ifctx->call.flags = htons(0x8000); /* We need a broadcast answer */
 1327 }
 1328 
 1329 static int
 1330 bootpc_hascookie(struct bootp_packet *bp)
 1331 {
 1332 
 1333         return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
 1334                 bp->vend[2] == 83 && bp->vend[3] == 99);
 1335 }
 1336 
 1337 static void
 1338 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
 1339     unsigned char *start, int len, int tag)
 1340 {
 1341         unsigned char *j;
 1342         unsigned char *ej;
 1343         unsigned char code;
 1344 
 1345         if (tctx->badtag != 0 || tctx->badopt != 0)
 1346                 return;
 1347 
 1348         j = start;
 1349         ej = j + len;
 1350 
 1351         while (j < ej) {
 1352                 code = *j++;
 1353                 if (code == TAG_PAD)
 1354                         continue;
 1355                 if (code == TAG_END)
 1356                         return;
 1357                 if (j >= ej || j + *j + 1 > ej) {
 1358                         tctx->badopt = 1;
 1359                         return;
 1360                 }
 1361                 len = *j++;
 1362                 if (code == tag) {
 1363                         if (tctx->taglen + len > TAG_MAXLEN) {
 1364                                 tctx->badtag = 1;
 1365                                 return;
 1366                         }
 1367                         tctx->foundopt = 1;
 1368                         if (len > 0)
 1369                                 memcpy(tctx->buf + tctx->taglen,
 1370                                        j, len);
 1371                         tctx->taglen += len;
 1372                 }
 1373                 if (code == TAG_OVERLOAD)
 1374                         tctx->overload = *j;
 1375 
 1376                 j += len;
 1377         }
 1378 }
 1379 
 1380 static unsigned char *
 1381 bootpc_tag(struct bootpc_tagcontext *tctx,
 1382     struct bootp_packet *bp, int len, int tag)
 1383 {
 1384         tctx->overload = 0;
 1385         tctx->badopt = 0;
 1386         tctx->badtag = 0;
 1387         tctx->foundopt = 0;
 1388         tctx->taglen = 0;
 1389 
 1390         if (bootpc_hascookie(bp) == 0)
 1391                 return NULL;
 1392 
 1393         bootpc_tag_helper(tctx, &bp->vend[4],
 1394                           (unsigned char *) bp + len - &bp->vend[4], tag);
 1395 
 1396         if ((tctx->overload & OVERLOAD_FILE) != 0)
 1397                 bootpc_tag_helper(tctx,
 1398                                   (unsigned char *) bp->file,
 1399                                   sizeof(bp->file),
 1400                                   tag);
 1401         if ((tctx->overload & OVERLOAD_SNAME) != 0)
 1402                 bootpc_tag_helper(tctx,
 1403                                   (unsigned char *) bp->sname,
 1404                                   sizeof(bp->sname),
 1405                                   tag);
 1406 
 1407         if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
 1408                 return NULL;
 1409         tctx->buf[tctx->taglen] = '\0';
 1410         return tctx->buf;
 1411 }
 1412 
 1413 static void
 1414 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
 1415     struct bootpc_globalcontext *gctx)
 1416 {
 1417         char *p, *s;
 1418         unsigned int ip;
 1419 
 1420         ifctx->gotgw = 0;
 1421         ifctx->gotnetmask = 0;
 1422 
 1423         clear_sinaddr(&ifctx->myaddr);
 1424         clear_sinaddr(&ifctx->netmask);
 1425         clear_sinaddr(&ifctx->gw);
 1426 
 1427         ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
 1428 
 1429         ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
 1430 
 1431         printf("%s at ", ifctx->ireq.ifr_name);
 1432         print_sin_addr(&ifctx->myaddr);
 1433         printf(" server ");
 1434         print_in_addr(ifctx->reply.siaddr);
 1435 
 1436         ifctx->gw.sin_addr = ifctx->reply.giaddr;
 1437         if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
 1438                 printf(" via gateway ");
 1439                 print_in_addr(ifctx->reply.giaddr);
 1440         }
 1441 
 1442         /* This call used for the side effect (overload flag) */
 1443         (void) bootpc_tag(&gctx->tmptag,
 1444                           &ifctx->reply, ifctx->replylen, TAG_END);
 1445 
 1446         if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
 1447                 if (ifctx->reply.sname[0] != '\0')
 1448                         printf(" server name %s", ifctx->reply.sname);
 1449         if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
 1450                 if (ifctx->reply.file[0] != '\0')
 1451                         printf(" boot file %s", ifctx->reply.file);
 1452 
 1453         printf("\n");
 1454 
 1455         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1456                        TAG_SUBNETMASK);
 1457         if (p != NULL) {
 1458                 if (gctx->tag.taglen != 4)
 1459                         panic("bootpc: subnet mask len is %d",
 1460                               gctx->tag.taglen);
 1461                 bcopy(p, &ifctx->netmask.sin_addr, 4);
 1462                 ifctx->gotnetmask = 1;
 1463                 printf("subnet mask ");
 1464                 print_sin_addr(&ifctx->netmask);
 1465                 printf(" ");
 1466         }
 1467 
 1468         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1469                        TAG_ROUTERS);
 1470         if (p != NULL) {
 1471                 /* Routers */
 1472                 if (gctx->tag.taglen % 4)
 1473                         panic("bootpc: Router Len is %d", gctx->tag.taglen);
 1474                 if (gctx->tag.taglen > 0) {
 1475                         bcopy(p, &ifctx->gw.sin_addr, 4);
 1476                         printf("router ");
 1477                         print_sin_addr(&ifctx->gw);
 1478                         printf(" ");
 1479                         ifctx->gotgw = 1;
 1480                         gctx->gotgw = 1;
 1481                 }
 1482         }
 1483 
 1484         /*
 1485          * Choose a root filesystem.  If a value is forced in the environment
 1486          * and it contains "nfs:", use it unconditionally.  Otherwise, if the
 1487          * kernel is compiled with the ROOTDEVNAME option, then use it if:
 1488          *  - The server doesn't provide a pathname.
 1489          *  - The boothowto flags include RB_DFLTROOT (user said to override
 1490          *    the server value).
 1491          */
 1492         p = NULL;
 1493         if ((s = kern_getenv("vfs.root.mountfrom")) != NULL) {
 1494                 if ((p = strstr(s, "nfs:")) != NULL)
 1495                         p = strdup(p + 4, M_TEMP);
 1496                 freeenv(s);
 1497         }
 1498         if (p == NULL) {
 1499                 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1500                        TAG_ROOT);
 1501                 if (p != NULL)
 1502                         ifctx->gotrootpath = 1;
 1503         }
 1504 #ifdef ROOTDEVNAME
 1505         if ((p == NULL || (boothowto & RB_DFLTROOT) != 0) && 
 1506             (p = strstr(ROOTDEVNAME, "nfs:")) != NULL) {
 1507                 p += 4;
 1508         }
 1509 #endif
 1510         if (p != NULL) {
 1511                 if (gctx->setrootfs != NULL) {
 1512                         printf("rootfs %s (ignored) ", p);
 1513                 } else  if (setfs(&nd->root_saddr,
 1514                                   nd->root_hostnam, p, &ifctx->reply.siaddr)) {
 1515                         if (*p == '/') {
 1516                                 printf("root_server ");
 1517                                 print_sin_addr(&nd->root_saddr);
 1518                                 printf(" ");
 1519                         }
 1520                         printf("rootfs %s ", p);
 1521                         gctx->gotrootpath = 1;
 1522                         gctx->setrootfs = ifctx;
 1523 
 1524                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
 1525                                        ifctx->replylen,
 1526                                        TAG_ROOTOPTS);
 1527                         if (p != NULL) {
 1528                                 mountopts(&nd->root_args, p);
 1529                                 printf("rootopts %s ", p);
 1530                         }
 1531                 } else
 1532                         panic("Failed to set rootfs to %s", p);
 1533         }
 1534 
 1535         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1536                        TAG_HOSTNAME);
 1537         if (p != NULL) {
 1538                 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
 1539                         panic("bootpc: hostname >= %d bytes",
 1540                               MAXHOSTNAMELEN);
 1541                 if (gctx->sethostname != NULL) {
 1542                         printf("hostname %s (ignored) ", p);
 1543                 } else {
 1544                         strcpy(nd->my_hostnam, p);
 1545                         mtx_lock(&prison0.pr_mtx);
 1546                         strcpy(prison0.pr_hostname, p);
 1547                         mtx_unlock(&prison0.pr_mtx);
 1548                         printf("hostname %s ", p);
 1549                         gctx->sethostname = ifctx;
 1550                 }
 1551         }
 1552         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1553                         TAG_COOKIE);
 1554         if (p != NULL) {        /* store in a sysctl variable */
 1555                 int i, l = sizeof(bootp_cookie) - 1;
 1556                 for (i = 0; i < l && p[i] != '\0'; i++)
 1557                         bootp_cookie[i] = p[i];
 1558                 p[i] = '\0';
 1559         }
 1560 
 1561         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1562                        TAG_INTF_MTU);
 1563         if (p != NULL) {
 1564                 ifctx->mtu = be16dec(p);
 1565         }
 1566 
 1567         printf("\n");
 1568 
 1569         if (ifctx->gotnetmask == 0) {
 1570                 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
 1571                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
 1572                 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
 1573                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
 1574                 else
 1575                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
 1576         }
 1577 }
 1578 
 1579 void
 1580 bootpc_init(void)
 1581 {
 1582         struct bootpc_ifcontext *ifctx;         /* Interface BOOTP contexts */
 1583         struct bootpc_globalcontext *gctx;      /* Global BOOTP context */
 1584         struct ifnet *ifp;
 1585         struct sockaddr_dl *sdl;
 1586         struct ifaddr *ifa;
 1587         int error;
 1588 #ifndef BOOTP_WIRED_TO
 1589         int ifcnt;
 1590 #endif
 1591         struct nfsv3_diskless *nd;
 1592         struct thread *td;
 1593         int timeout;
 1594         int delay;
 1595 
 1596         timeout = BOOTP_IFACE_WAIT_TIMEOUT * hz;
 1597         delay = hz / 10;
 1598 
 1599         nd = &nfsv3_diskless;
 1600         td = curthread;
 1601 
 1602         /*
 1603          * If already filled in, don't touch it here
 1604          */
 1605         if (nfs_diskless_valid != 0)
 1606                 return;
 1607 
 1608         gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
 1609         STAILQ_INIT(&gctx->interfaces);
 1610         gctx->xid = ~0xFFFF;
 1611         gctx->starttime = time_second;
 1612 
 1613         /*
 1614          * If ROOTDEVNAME is defined or vfs.root.mountfrom is set then we have
 1615          * root-path overrides that can potentially let us boot even if we don't
 1616          * get a root path from the server, so we can treat that as a non-error.
 1617          */
 1618 #ifdef ROOTDEVNAME
 1619         gctx->any_root_overrides = 1;
 1620 #else
 1621         gctx->any_root_overrides = testenv("vfs.root.mountfrom");
 1622 #endif
 1623 
 1624         /*
 1625          * Find a network interface.
 1626          */
 1627         CURVNET_SET(TD_TO_VNET(td));
 1628 #ifdef BOOTP_WIRED_TO
 1629         printf("%s: wired to interface '%s'\n", __func__, 
 1630                __XSTRING(BOOTP_WIRED_TO));
 1631         allocifctx(gctx);
 1632 #else
 1633         /*
 1634          * Preallocate interface context storage, if another interface
 1635          * attaches and wins the race, it won't be eligible for bootp.
 1636          */
 1637         ifcnt = 0;
 1638         IFNET_RLOCK();
 1639         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
 1640                 if ((ifp->if_flags &
 1641                      (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
 1642                     IFF_BROADCAST)
 1643                         continue;
 1644                 switch (ifp->if_alloctype) {
 1645                         case IFT_ETHER:
 1646                         case IFT_FDDI:
 1647                         case IFT_ISO88025:
 1648                                 break;
 1649                         default:
 1650                                 continue;
 1651                 }
 1652                 ifcnt++;
 1653         }
 1654         IFNET_RUNLOCK();
 1655         if (ifcnt == 0)
 1656                 panic("%s: no eligible interfaces", __func__);
 1657         for (; ifcnt > 0; ifcnt--)
 1658                 allocifctx(gctx);
 1659 #endif
 1660 
 1661 retry:
 1662         ifctx = STAILQ_FIRST(&gctx->interfaces);
 1663         IFNET_RLOCK();
 1664         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
 1665                 if (ifctx == NULL)
 1666                         break;
 1667 #ifdef BOOTP_WIRED_TO
 1668                 if (strcmp(ifp->if_xname, __XSTRING(BOOTP_WIRED_TO)) != 0)
 1669                         continue;
 1670 #else
 1671                 if ((ifp->if_flags &
 1672                      (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
 1673                     IFF_BROADCAST)
 1674                         continue;
 1675                 switch (ifp->if_alloctype) {
 1676                         case IFT_ETHER:
 1677                         case IFT_FDDI:
 1678                         case IFT_ISO88025:
 1679                                 break;
 1680                         default:
 1681                                 continue;
 1682                 }
 1683 #endif
 1684                 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
 1685                     sizeof(ifctx->ireq.ifr_name));
 1686                 ifctx->ifp = ifp;
 1687 
 1688                 /* Get HW address */
 1689                 sdl = NULL;
 1690                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
 1691                         if (ifa->ifa_addr->sa_family == AF_LINK) {
 1692                                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
 1693                                 if (sdl->sdl_type == IFT_ETHER)
 1694                                         break;
 1695                         }
 1696                 if (sdl == NULL)
 1697                         panic("bootpc: Unable to find HW address for %s",
 1698                             ifctx->ireq.ifr_name);
 1699                 ifctx->sdl = sdl;
 1700 
 1701                 ifctx = STAILQ_NEXT(ifctx, next);
 1702         }
 1703         IFNET_RUNLOCK();
 1704         CURVNET_RESTORE();
 1705 
 1706         if (STAILQ_EMPTY(&gctx->interfaces) ||
 1707             STAILQ_FIRST(&gctx->interfaces)->ifp == NULL) {
 1708                 if (timeout > 0) {
 1709                         pause("bootpc", delay);
 1710                         timeout -= delay;
 1711                         goto retry;
 1712                 }
 1713 #ifdef BOOTP_WIRED_TO
 1714                 panic("%s: Could not find interface specified "
 1715                       "by BOOTP_WIRED_TO: "
 1716                       __XSTRING(BOOTP_WIRED_TO), __func__);
 1717 #else
 1718                 panic("%s: no suitable interface", __func__);
 1719 #endif
 1720         }
 1721 
 1722         error = socreate(AF_INET, &bootp_so, SOCK_DGRAM, 0, td->td_ucred, td);
 1723         if (error != 0)
 1724                 panic("%s: socreate, error=%d", __func__, error);
 1725 
 1726         STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
 1727                 bootpc_fakeup_interface(ifctx, td);
 1728 
 1729         STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
 1730                 bootpc_compose_query(ifctx, td);
 1731 
 1732         error = bootpc_call(gctx, td);
 1733         if (error != 0) {
 1734                 printf("BOOTP call failed\n");
 1735         }
 1736 
 1737         mountopts(&nd->root_args, NULL);
 1738 
 1739         STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
 1740                 if (bootpc_ifctx_isresolved(ifctx) != 0)
 1741                         bootpc_decode_reply(nd, ifctx, gctx);
 1742 
 1743 #ifdef BOOTP_NFSROOT
 1744         if (gctx->gotrootpath == 0 && gctx->any_root_overrides == 0)
 1745                 panic("bootpc: No root path offered");
 1746 #endif
 1747 
 1748         STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
 1749                 bootpc_adjust_interface(ifctx, gctx, td);
 1750 
 1751         soclose(bootp_so);
 1752 
 1753         STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
 1754                 if (ifctx->gotrootpath != 0)
 1755                         break;
 1756         if (ifctx == NULL) {
 1757                 STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
 1758                         if (bootpc_ifctx_isresolved(ifctx) != 0)
 1759                                 break;
 1760         }
 1761         if (ifctx == NULL)
 1762                 goto out;
 1763 
 1764         if (gctx->gotrootpath != 0) {
 1765 
 1766                 kern_setenv("boot.netif.name", ifctx->ifp->if_xname);
 1767 
 1768                 bootpc_add_default_route(ifctx);
 1769                 error = md_mount(&nd->root_saddr, nd->root_hostnam,
 1770                                  nd->root_fh, &nd->root_fhsize,
 1771                                  &nd->root_args, td);
 1772                 bootpc_remove_default_route(ifctx);
 1773                 if (error != 0) {
 1774                         if (gctx->any_root_overrides == 0)
 1775                                 panic("nfs_boot: mount root, error=%d", error);
 1776                         else
 1777                                 goto out;
 1778                 }
 1779                 rootdevnames[0] = "nfs:";
 1780                 nfs_diskless_valid = 3;
 1781         }
 1782 
 1783         strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
 1784         bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
 1785         bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
 1786         ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
 1787                 ifctx->myaddr.sin_addr.s_addr |
 1788                 ~ ifctx->netmask.sin_addr.s_addr;
 1789         bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
 1790         bcopy(&ifctx->gw, &nd->mygateway, sizeof(ifctx->gw));
 1791 
 1792 out:
 1793         while((ifctx = STAILQ_FIRST(&gctx->interfaces)) != NULL) {
 1794                 STAILQ_REMOVE_HEAD(&gctx->interfaces, next);
 1795                 free(ifctx, M_TEMP);
 1796         }
 1797         free(gctx, M_TEMP);
 1798 }
 1799 
 1800 /*
 1801  * RPC: mountd/mount
 1802  * Given a server pathname, get an NFS file handle.
 1803  * Also, sets sin->sin_port to the NFS service port.
 1804  */
 1805 static int
 1806 md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep,
 1807     struct nfs_args *args, struct thread *td)
 1808 {
 1809         struct mbuf *m;
 1810         int error;
 1811         int authunixok;
 1812         int authcount;
 1813         int authver;
 1814 
 1815 #define RPCPROG_MNT     100005
 1816 #define RPCMNT_VER1     1
 1817 #define RPCMNT_VER3     3
 1818 #define RPCMNT_MOUNT    1
 1819 #define AUTH_SYS        1               /* unix style (uid, gids) */
 1820 #define AUTH_UNIX       AUTH_SYS
 1821 
 1822         /* XXX honor v2/v3 flags in args->flags? */
 1823 #ifdef BOOTP_NFSV3
 1824         /* First try NFS v3 */
 1825         /* Get port number for MOUNTD. */
 1826         error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3,
 1827                              &mdsin->sin_port, td);
 1828         if (error == 0) {
 1829                 m = xdr_string_encode(path, strlen(path));
 1830 
 1831                 /* Do RPC to mountd. */
 1832                 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3,
 1833                                   RPCMNT_MOUNT, &m, NULL, td);
 1834         }
 1835         if (error == 0) {
 1836                 args->flags |= NFSMNT_NFSV3;
 1837         } else {
 1838 #endif
 1839                 /* Fallback to NFS v2 */
 1840 
 1841                 /* Get port number for MOUNTD. */
 1842                 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1,
 1843                                      &mdsin->sin_port, td);
 1844                 if (error != 0)
 1845                         return error;
 1846 
 1847                 m = xdr_string_encode(path, strlen(path));
 1848 
 1849                 /* Do RPC to mountd. */
 1850                 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1,
 1851                                   RPCMNT_MOUNT, &m, NULL, td);
 1852                 if (error != 0)
 1853                         return error;   /* message already freed */
 1854 
 1855 #ifdef BOOTP_NFSV3
 1856         }
 1857 #endif
 1858 
 1859         if (xdr_int_decode(&m, &error) != 0 || error != 0)
 1860                 goto bad;
 1861 
 1862         if ((args->flags & NFSMNT_NFSV3) != 0) {
 1863                 if (xdr_int_decode(&m, fhsizep) != 0 ||
 1864                     *fhsizep > NFSX_V3FHMAX ||
 1865                     *fhsizep <= 0)
 1866                         goto bad;
 1867         } else
 1868                 *fhsizep = NFSX_V2FH;
 1869 
 1870         if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0)
 1871                 goto bad;
 1872 
 1873         if (args->flags & NFSMNT_NFSV3) {
 1874                 if (xdr_int_decode(&m, &authcount) != 0)
 1875                         goto bad;
 1876                 authunixok = 0;
 1877                 if (authcount < 0 || authcount > 100)
 1878                         goto bad;
 1879                 while (authcount > 0) {
 1880                         if (xdr_int_decode(&m, &authver) != 0)
 1881                                 goto bad;
 1882                         if (authver == AUTH_UNIX)
 1883                                 authunixok = 1;
 1884                         authcount--;
 1885                 }
 1886                 if (authunixok == 0)
 1887                         goto bad;
 1888         }
 1889 
 1890         /* Set port number for NFS use. */
 1891         error = krpc_portmap(mdsin, NFS_PROG,
 1892                              (args->flags &
 1893                               NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2,
 1894                              &mdsin->sin_port, td);
 1895 
 1896         goto out;
 1897 
 1898 bad:
 1899         error = EBADRPC;
 1900 
 1901 out:
 1902         m_freem(m);
 1903         return error;
 1904 }
 1905 
 1906 SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, bootpc_init, NULL);

Cache object: dcbefa463ce4b969dbebf716192783cd


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