Bring in some kernel bootp support. This removes the need for netboot

to fill in the nfs_diskless structure, at the cost of some kernel
bloat. The advantage is that this code works on a wider range of
network adapters than netboot. Several new kernel options are
documented in LINT.
Obtained from: parts of the code comes from NetBSD.

1 files changed, 592 insertions, 0 deletions

diff --git a/sys/nfs/krpc_subr.c b/sys/nfs/krpc_subr.c
new file mode 100644
index 0000000..bb31e4b
--- /dev/null
+++ b/sys/nfs/krpc_subr.c
@@ -0,0 +1,592 @@
+/*	$NetBSD: krpc_subr.c,v 1.12.4.1 1996/06/07 00:52:26 cgd Exp $	*/
+/*	$Id:$	*/
+
+/*
+ * 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.
+ *
+ * partially based on:
+ *      libnetboot/rpc.c
+ *               @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp  (LBL)
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/sockio.h>
+#include <sys/proc.h>
+#include <sys/mount.h>
+#include <sys/mbuf.h>
+#include <sys/reboot.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+
+#include <net/if.h>
+#include <netinet/in.h>
+
+#include <nfs/rpcv2.h>
+#include <nfs/krpc.h>
+#include <nfs/xdr_subs.h>
+
+/*
+ * Kernel support for Sun RPC
+ *
+ * Used currently for bootstrapping in nfs diskless configurations.
+ */
+
+/*
+ * Generic RPC headers
+ */
+
+struct auth_info {
+	u_int32_t 	authtype;	/* auth type */
+	u_int32_t	authlen;	/* auth length */
+};
+
+struct auth_unix {
+	int32_t   ua_time;
+	int32_t   ua_hostname;	/* null */
+	int32_t   ua_uid;
+	int32_t   ua_gid;
+	int32_t   ua_gidlist;	/* null */
+};
+
+struct rpc_call {
+	u_int32_t	rp_xid;		/* request transaction id */
+	int32_t 	rp_direction;	/* call direction (0) */
+	u_int32_t	rp_rpcvers;	/* rpc version (2) */
+	u_int32_t	rp_prog;	/* program */
+	u_int32_t	rp_vers;	/* version */
+	u_int32_t	rp_proc;	/* procedure */
+	struct	auth_info rpc_auth;
+	struct	auth_unix rpc_unix;
+	struct	auth_info rpc_verf;
+};
+
+struct rpc_reply {
+	u_int32_t rp_xid;		/* request transaction id */
+	int32_t  rp_direction;		/* call direction (1) */
+	int32_t  rp_astatus;		/* accept status (0: accepted) */
+	union {
+		u_int32_t rpu_errno;
+		struct {
+			struct auth_info rok_auth;
+			u_int32_t	rok_status;
+		} rpu_rok;
+	} rp_u;
+};
+#define rp_errno  rp_u.rpu_errno
+#define rp_auth   rp_u.rpu_rok.rok_auth
+#define rp_status rp_u.rpu_rok.rok_status
+
+#define MIN_REPLY_HDR 16	/* xid, dir, astat, errno */
+
+/*
+ * 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 */
+
+/*
+ * Call portmap to lookup a port number for a particular rpc program
+ * Returns non-zero error on failure.
+ */
+int
+krpc_portmap(sin,  prog, vers, portp, procp)
+	struct sockaddr_in *sin;		/* server address */
+	u_int prog, vers;	/* host order */
+	u_int16_t *portp;	/* network order */
+	struct proc *procp;
+{
+	struct sdata {
+		u_int32_t prog;		/* call program */
+		u_int32_t vers;		/* call version */
+		u_int32_t proto;	/* call protocol */
+		u_int32_t port;		/* call port (unused) */
+	} *sdata;
+	struct rdata {
+		u_int16_t pad;
+		u_int16_t port;
+	} *rdata;
+	struct mbuf *m;
+	int error;
+
+	/* The portmapper port is fixed. */
+	if (prog == PMAPPROG) {
+		*portp = htons(PMAPPORT);
+		return 0;
+	}
+
+	m = m_get(M_WAIT, MT_DATA);
+	if (m == NULL)
+		return ENOBUFS;
+	sdata = mtod(m, struct sdata *);
+	m->m_len = sizeof(*sdata);
+
+	/* Do the RPC to get it. */
+	sdata->prog = txdr_unsigned(prog);
+	sdata->vers = txdr_unsigned(vers);
+	sdata->proto = txdr_unsigned(IPPROTO_UDP);
+	sdata->port = 0;
+
+	sin->sin_port = htons(PMAPPORT);
+	error = krpc_call(sin, PMAPPROG, PMAPVERS,
+					  PMAPPROC_GETPORT, &m, NULL, procp);
+	if (error) 
+		return error;
+
+	if (m->m_len < sizeof(*rdata)) {
+		m = m_pullup(m, sizeof(*rdata));
+		if (m == NULL)
+			return ENOBUFS;
+	}
+	rdata = mtod(m, struct rdata *);
+	*portp = rdata->port;
+
+	m_freem(m);
+	return 0;
+}
+
+/*
+ * Do a remote procedure call (RPC) and wait for its reply.
+ * If from_p is non-null, then we are doing broadcast, and
+ * the address from whence the response came is saved there.
+ */
+int
+krpc_call(sa, prog, vers, func, data, from_p, procp)
+	struct sockaddr_in *sa;
+	u_int prog, vers, func;
+	struct mbuf **data;	/* input/output */
+	struct mbuf **from_p;	/* output */
+	struct proc *procp;
+{
+	struct socket *so;
+	struct sockaddr_in *sin;
+	struct mbuf *m, *nam, *mhead, *from;
+	struct rpc_call *call;
+	struct rpc_reply *reply;
+	struct uio auio;
+	int error, rcvflg, timo, secs, len;
+	static u_int32_t xid = ~0xFF;
+	u_int16_t tport;
+
+	/*
+	 * Validate address family.
+	 * Sorry, this is INET specific...
+	 */
+	if (sa->sin_family != AF_INET)
+		return (EAFNOSUPPORT);
+
+	/* Free at end if not null. */
+	nam = mhead = NULL;
+	from = NULL;
+
+	/*
+	 * Create socket and set its recieve timeout.
+	 */
+	if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, procp)))
+		goto out;
+
+	m = m_get(M_WAIT, MT_SOOPTS);
+	if (m == NULL) {
+		error = ENOBUFS;
+		goto out;
+	} else {
+		struct timeval *tv;
+		tv = mtod(m, struct timeval *);
+		m->m_len = sizeof(*tv);
+		tv->tv_sec = 1;
+		tv->tv_usec = 0;
+		if ((error = sosetopt(so, SOL_SOCKET, SO_RCVTIMEO, m, procp)))
+			goto out;
+	}
+
+	/*
+	 * Enable broadcast if necessary.
+	 */
+	if (from_p) {
+		int32_t *on;
+		m = m_get(M_WAIT, MT_SOOPTS);
+		if (m == NULL) {
+			error = ENOBUFS;
+			goto out;
+		}
+		on = mtod(m, int32_t *);
+		m->m_len = sizeof(*on);
+		*on = 1;
+		if ((error = sosetopt(so, SOL_SOCKET, SO_BROADCAST, m, procp)))
+			goto out;
+	}
+
+	/*
+	 * Bind the local endpoint to a reserved port,
+	 * because some NFS servers refuse requests from
+	 * non-reserved (non-privileged) ports.
+	 */
+	m = m_getclr(M_WAIT, MT_SONAME);
+	sin = mtod(m, struct sockaddr_in *);
+	sin->sin_len = m->m_len = sizeof(*sin);
+	sin->sin_family = AF_INET;
+	sin->sin_addr.s_addr = INADDR_ANY;
+	tport = IPPORT_RESERVED;
+	do {
+		tport--;
+		sin->sin_port = htons(tport);
+		error = sobind(so, m, procp);
+	} while (error == EADDRINUSE &&
+			 tport > IPPORT_RESERVED / 2);
+	m_freem(m);
+	if (error) {
+		printf("bind failed\n");
+		goto out;
+	}
+
+	/*
+	 * Setup socket address for the server.
+	 */
+	nam = m_get(M_WAIT, MT_SONAME);
+	if (nam == NULL) {
+		error = ENOBUFS;
+		goto out;
+	}
+	sin = mtod(nam, struct sockaddr_in *);
+	bcopy((caddr_t)sa, (caddr_t)sin,
+		  (nam->m_len = sa->sin_len));
+
+	/*
+	 * Prepend RPC message header.
+	 */
+	mhead = m_gethdr(M_WAIT, MT_DATA);
+	mhead->m_next = *data;
+	call = mtod(mhead, struct rpc_call *);
+	mhead->m_len = sizeof(*call);
+	bzero((caddr_t)call, sizeof(*call));
+	/* rpc_call part */
+	xid++;
+	call->rp_xid = txdr_unsigned(xid);
+	/* call->rp_direction = 0; */
+	call->rp_rpcvers = txdr_unsigned(2);
+	call->rp_prog = txdr_unsigned(prog);
+	call->rp_vers = txdr_unsigned(vers);
+	call->rp_proc = txdr_unsigned(func);
+	/* rpc_auth part (auth_unix as root) */
+	call->rpc_auth.authtype = txdr_unsigned(RPCAUTH_UNIX);
+	call->rpc_auth.authlen  = txdr_unsigned(sizeof(struct auth_unix));
+	/* rpc_verf part (auth_null) */
+	call->rpc_verf.authtype = 0;
+	call->rpc_verf.authlen  = 0;
+
+	/*
+	 * Setup packet header
+	 */
+	len = 0;
+	m = mhead;
+	while (m) {
+		len += m->m_len;
+		m = m->m_next;
+	}
+	mhead->m_pkthdr.len = len;
+	mhead->m_pkthdr.rcvif = NULL;
+
+	/*
+	 * 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;
+	for (;;) {
+		/* Send RPC request (or re-send). */
+		m = m_copym(mhead, 0, M_COPYALL, M_WAIT);
+		if (m == NULL) {
+			error = ENOBUFS;
+			goto out;
+		}
+		error = sosend(so, nam, NULL, m, NULL, 0);
+		if (error) {
+			printf("krpc_call: sosend: %d\n", error);
+			goto out;
+		}
+		m = NULL;
+
+		/* Determine new timeout. */
+		if (timo < MAX_RESEND_DELAY)
+			timo++;
+		else
+			printf("RPC timeout for server 0x%x\n",
+			       ntohl(sin->sin_addr.s_addr));
+
+		/*
+		 * Wait for up to timo seconds for a reply.
+		 * The socket receive timeout was set to 1 second.
+		 */
+		secs = timo;
+		while (secs > 0) {
+			if (from) {
+				m_freem(from);
+				from = NULL;
+			}
+			if (m) {
+				m_freem(m);
+				m = NULL;
+			}
+			bzero(&auio,sizeof(auio));
+			auio.uio_resid = len = 1<<16;
+			rcvflg = 0;
+			error = soreceive(so, &from, &auio, &m, NULL, &rcvflg);
+			if (error == EWOULDBLOCK) {
+				secs--;
+				continue;
+			}
+			if (error)
+				goto out;
+			len -= auio.uio_resid;
+
+			/* Does the reply contain at least a header? */
+			if (len < MIN_REPLY_HDR)
+				continue;
+			if (m->m_len < MIN_REPLY_HDR)
+				continue;
+			reply = mtod(m, struct rpc_reply *);
+
+			/* Is it the right reply? */
+			if (reply->rp_direction != txdr_unsigned(RPC_REPLY))
+				continue;
+
+			if (reply->rp_xid != txdr_unsigned(xid))
+				continue;
+
+			/* Was RPC accepted? (authorization OK) */
+			if (reply->rp_astatus != 0) {
+				error = fxdr_unsigned(u_int32_t, reply->rp_errno);
+				printf("rpc denied, error=%d\n", error);
+				continue;
+			}
+
+			/* Did the call succeed? */
+			if (reply->rp_status != 0) {
+				error = fxdr_unsigned(u_int32_t, reply->rp_status);
+				if (error == RPC_PROGMISMATCH) {
+				  error = EBADRPC;
+				  goto out;
+				}
+				printf("rpc denied, status=%d\n", error);
+				continue;
+			}
+
+			goto gotreply;	/* break two levels */
+
+		} /* while secs */
+	} /* forever send/receive */
+
+	error = ETIMEDOUT;
+	goto out;
+
+ gotreply:
+
+	/*
+	 * Get RPC reply header into first mbuf,
+	 * get its length, then strip it off.
+	 */
+	len = sizeof(*reply);
+	if (m->m_len < len) {
+		m = m_pullup(m, len);
+		if (m == NULL) {
+			error = ENOBUFS;
+			goto out;
+		}
+	}
+	reply = mtod(m, struct rpc_reply *);
+	if (reply->rp_auth.authtype != 0) {
+		len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen);
+		len = (len + 3) & ~3; /* XXX? */
+	}
+	m_adj(m, len);
+
+	/* result */
+	*data = m;
+	if (from_p) {
+		*from_p = from;
+		from = NULL;
+	}
+
+ out:
+	if (nam) m_freem(nam);
+	if (mhead) m_freem(mhead);
+	if (from) m_freem(from);
+	soclose(so);
+	return error;
+}
+
+/*
+ * eXternal Data Representation routines.
+ * (but with non-standard args...)
+ */
+
+/*
+ * String representation for RPC.
+ */
+struct xdr_string {
+	u_int32_t len;		/* length without null or padding */
+	char data[4];	/* data (longer, of course) */
+    /* data is padded to a long-word boundary */
+};
+
+struct mbuf *
+xdr_string_encode(str, len)
+	char *str;
+	int len;
+{
+	struct mbuf *m;
+	struct xdr_string *xs;
+	int dlen;	/* padded string length */
+	int mlen;	/* message length */
+
+	dlen = (len + 3) & ~3;
+	mlen = dlen + 4;
+
+	if (mlen > MCLBYTES)		/* If too big, we just can't do it. */
+		return (NULL);
+
+	m = m_get(M_WAIT, MT_DATA);
+	if (mlen > MLEN) {
+		MCLGET(m, M_WAIT);
+		if ((m->m_flags & M_EXT) == 0) {
+			(void) m_free(m);	/* There can be only one. */
+			return (NULL);
+		}
+	}
+	xs = mtod(m, struct xdr_string *);
+	m->m_len = mlen;
+	xs->len = txdr_unsigned(len);
+	bcopy(str, xs->data, len);
+	return (m);
+}
+
+struct mbuf *
+xdr_string_decode(m, str, len_p)
+	struct mbuf *m;
+	char *str;
+	int *len_p;		/* bufsize - 1 */
+{
+	struct xdr_string *xs;
+	int mlen;	/* message length */
+	int slen;	/* string length */
+
+	if (m->m_len < 4) {
+		m = m_pullup(m, 4);
+		if (m == NULL)
+			return (NULL);
+	}
+	xs = mtod(m, struct xdr_string *);
+	slen = fxdr_unsigned(u_int32_t, xs->len);
+	mlen = 4 + ((slen + 3) & ~3);
+
+	if (slen > *len_p)
+		slen = *len_p;
+	m_copydata(m, 4, slen, str);
+	m_adj(m, mlen);
+
+	str[slen] = '\0';
+	*len_p = slen;
+
+	return (m);
+}
+
+
+/*
+ * Inet address in RPC messages
+ * (Note, really four ints, NOT chars.  Blech.)
+ */
+struct xdr_inaddr {
+	u_int32_t atype;
+	u_int32_t addr[4];
+};
+
+struct mbuf *
+xdr_inaddr_encode(ia)
+	struct in_addr *ia;		/* already in network order */
+{
+	struct mbuf *m;
+	struct xdr_inaddr *xi;
+	u_int8_t *cp;
+	u_int32_t *ip;
+
+	m = m_get(M_WAIT, MT_DATA);
+	xi = mtod(m, struct xdr_inaddr *);
+	m->m_len = sizeof(*xi);
+	xi->atype = txdr_unsigned(1);
+	ip = xi->addr;
+	cp = (u_int8_t *)&ia->s_addr;
+	*ip++ = txdr_unsigned(*cp++);
+	*ip++ = txdr_unsigned(*cp++);
+	*ip++ = txdr_unsigned(*cp++);
+	*ip++ = txdr_unsigned(*cp++);
+
+	return (m);
+}
+
+struct mbuf *
+xdr_inaddr_decode(m, ia)
+	struct mbuf *m;
+	struct in_addr *ia;		/* already in network order */
+{
+	struct xdr_inaddr *xi;
+	u_int8_t *cp;
+	u_int32_t *ip;
+
+	if (m->m_len < sizeof(*xi)) {
+		m = m_pullup(m, sizeof(*xi));
+		if (m == NULL)
+			return (NULL);
+	}
+	xi = mtod(m, struct xdr_inaddr *);
+	if (xi->atype != txdr_unsigned(1)) {
+		ia->s_addr = INADDR_ANY;
+		goto out;
+	}
+	ip = xi->addr;
+	cp = (u_int8_t *)&ia->s_addr;
+	*cp++ = fxdr_unsigned(u_int8_t, *ip++);
+	*cp++ = fxdr_unsigned(u_int8_t, *ip++);
+	*cp++ = fxdr_unsigned(u_int8_t, *ip++);
+	*cp++ = fxdr_unsigned(u_int8_t, *ip++);
+
+out:
+	m_adj(m, sizeof(*xi));
+	return (m);
+}