mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-06 17:18:32 +00:00
1405 lines
39 KiB
C
1405 lines
39 KiB
C
/*
|
|
* Copyright (C) 2002-2012 by Ryan Beasley <ryanb@goddamnbastard.org>
|
|
*
|
|
* See the IPFILTER.LICENCE file for details on licencing.
|
|
*/
|
|
/*
|
|
* Overview:
|
|
* This is an in-kernel application proxy for Sun's RPCBIND (nee portmap)
|
|
* protocol as defined in RFC1833. It is far from complete, mostly
|
|
* lacking in less-likely corner cases, but it's definitely functional.
|
|
*
|
|
* Invocation:
|
|
* rdr <int> <e_ip>/32 port <e_p> -> <i_ip> port <i_p> udp proxy rpcbu
|
|
*
|
|
* If the host running IP Filter is the same as the RPC server, it's
|
|
* perfectly legal for both the internal and external addresses and ports
|
|
* to match.
|
|
*
|
|
* When triggered by appropriate IP NAT rules, this proxy works by
|
|
* examining data contained in received packets. Requests and replies are
|
|
* modified, NAT and state table entries created, etc., as necessary.
|
|
*/
|
|
/*
|
|
* TODO / NOTES
|
|
*
|
|
* o Must implement locking to protect proxy session data.
|
|
* o Fragmentation isn't supported.
|
|
* o Only supports UDP.
|
|
* o Doesn't support multiple RPC records in a single request.
|
|
* o Errors should be more fine-grained. (e.g., malloc failure vs.
|
|
* illegal RPCB request / reply)
|
|
* o Even with the limit on the total amount of recorded transactions,
|
|
* should there be a timeout on transaction removal?
|
|
* o There is a potential collision between cloning, wildcard NAT and
|
|
* state entries. There should be an appr_getport routine for
|
|
* to avoid this.
|
|
* o The enclosed hack of STREAMS support is pretty sick and most likely
|
|
* broken.
|
|
*
|
|
* $Id$
|
|
*/
|
|
#define IPF_RPCB_PROXY
|
|
|
|
/*
|
|
* Function prototypes
|
|
*/
|
|
void ipf_p_rpcb_main_load(void);
|
|
void ipf_p_rpcb_main_unload(void);
|
|
int ipf_p_rpcb_new(void *, fr_info_t *, ap_session_t *, nat_t *);
|
|
void ipf_p_rpcb_del(ipf_main_softc_t *, ap_session_t *);
|
|
int ipf_p_rpcb_in(void *, fr_info_t *, ap_session_t *, nat_t *);
|
|
int ipf_p_rpcb_out(void *, fr_info_t *, ap_session_t *, nat_t *);
|
|
|
|
static void ipf_p_rpcb_flush(rpcb_session_t *);
|
|
static int ipf_p_rpcb_decodereq(fr_info_t *, nat_t *,
|
|
rpcb_session_t *, rpc_msg_t *);
|
|
static int ipf_p_rpcb_skipauth(rpc_msg_t *, xdr_auth_t *, u_32_t **);
|
|
static int ipf_p_rpcb_insert(rpcb_session_t *, rpcb_xact_t *);
|
|
static int ipf_p_rpcb_xdrrpcb(rpc_msg_t *, u_32_t *, rpcb_args_t *);
|
|
static int ipf_p_rpcb_getuaddr(rpc_msg_t *, xdr_uaddr_t *,
|
|
u_32_t **);
|
|
static u_int ipf_p_rpcb_atoi(char *);
|
|
static int ipf_p_rpcb_modreq(fr_info_t *, nat_t *, rpc_msg_t *,
|
|
mb_t *, u_int);
|
|
static int ipf_p_rpcb_decoderep(fr_info_t *, nat_t *,
|
|
rpcb_session_t *, rpc_msg_t *, rpcb_xact_t **);
|
|
static rpcb_xact_t * ipf_p_rpcb_lookup(rpcb_session_t *, u_32_t);
|
|
static void ipf_p_rpcb_deref(rpcb_session_t *, rpcb_xact_t *);
|
|
static int ipf_p_rpcb_getproto(rpc_msg_t *, xdr_proto_t *,
|
|
u_32_t **);
|
|
static int ipf_p_rpcb_getnat(fr_info_t *, nat_t *, u_int, u_int);
|
|
static int ipf_p_rpcb_modv3(fr_info_t *, nat_t *, rpc_msg_t *,
|
|
mb_t *, u_int);
|
|
static int ipf_p_rpcb_modv4(fr_info_t *, nat_t *, rpc_msg_t *,
|
|
mb_t *, u_int);
|
|
static void ipf_p_rpcb_fixlen(fr_info_t *, int);
|
|
|
|
/*
|
|
* Global variables
|
|
*/
|
|
static frentry_t rpcbfr; /* Skeleton rule for reference by entities
|
|
this proxy creates. */
|
|
VNET_DEFINE_STATIC(int, rpcbcnt);
|
|
#define V_rpcbcnt VNET(rpcbcnt)
|
|
/* Upper bound of allocated RPCB sessions. */
|
|
/* XXX rpcbcnt still requires locking. */
|
|
|
|
static int rpcb_proxy_init = 0;
|
|
|
|
|
|
/*
|
|
* Since rpc_msg contains only pointers, one should use this macro as a
|
|
* handy way to get to the goods. (In case you're wondering about the name,
|
|
* this started as BYTEREF -> BREF -> B.)
|
|
*/
|
|
#define B(r) (u_32_t)ntohl(*(r))
|
|
|
|
/*
|
|
* Public subroutines
|
|
*/
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_main_load */
|
|
/* Returns: void */
|
|
/* Parameters: (void) */
|
|
/* */
|
|
/* Initialize the filter rule entry and session limiter. */
|
|
/* -------------------------------------------------------------------- */
|
|
void
|
|
ipf_p_rpcb_main_load(void)
|
|
{
|
|
V_rpcbcnt = 0;
|
|
|
|
bzero((char *)&rpcbfr, sizeof(rpcbfr));
|
|
rpcbfr.fr_ref = 1;
|
|
rpcbfr.fr_flags = FR_PASS|FR_QUICK|FR_KEEPSTATE;
|
|
MUTEX_INIT(&rpcbfr.fr_lock, "ipf Sun RPCB proxy rule lock");
|
|
rpcb_proxy_init = 1;
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_main_unload */
|
|
/* Returns: void */
|
|
/* Parameters: (void) */
|
|
/* */
|
|
/* Destroy rpcbfr's mutex to avoid a lock leak. */
|
|
/* -------------------------------------------------------------------- */
|
|
void
|
|
ipf_p_rpcb_main_unload(void)
|
|
{
|
|
if (rpcb_proxy_init == 1) {
|
|
MUTEX_DESTROY(&rpcbfr.fr_lock);
|
|
rpcb_proxy_init = 0;
|
|
}
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_new */
|
|
/* Returns: int - -1 == failure, 0 == success */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* aps(I) - pointer to proxy session structure */
|
|
/* nat(I) - pointer to NAT session structure */
|
|
/* */
|
|
/* Allocate resources for per-session proxy structures. */
|
|
/* -------------------------------------------------------------------- */
|
|
int
|
|
ipf_p_rpcb_new(void *arg, fr_info_t *fin, ap_session_t *aps, nat_t *nat)
|
|
{
|
|
rpcb_session_t *rs;
|
|
|
|
nat = nat; /* LINT */
|
|
|
|
if (fin->fin_v != 4)
|
|
return (-1);
|
|
|
|
KMALLOC(rs, rpcb_session_t *);
|
|
if (rs == NULL)
|
|
return (-1);
|
|
|
|
bzero((char *)rs, sizeof(*rs));
|
|
MUTEX_INIT(&rs->rs_rxlock, "ipf Sun RPCB proxy session lock");
|
|
|
|
aps->aps_data = rs;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_del */
|
|
/* Returns: void */
|
|
/* Parameters: aps(I) - pointer to proxy session structure */
|
|
/* */
|
|
/* Free up a session's list of RPCB requests. */
|
|
/* -------------------------------------------------------------------- */
|
|
void
|
|
ipf_p_rpcb_del(ipf_main_softc_t *softc, ap_session_t *aps)
|
|
{
|
|
rpcb_session_t *rs;
|
|
rs = (rpcb_session_t *)aps->aps_data;
|
|
|
|
MUTEX_ENTER(&rs->rs_rxlock);
|
|
ipf_p_rpcb_flush(rs);
|
|
MUTEX_EXIT(&rs->rs_rxlock);
|
|
MUTEX_DESTROY(&rs->rs_rxlock);
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_in */
|
|
/* Returns: int - APR_ERR(1) == drop the packet, */
|
|
/* APR_ERR(2) == kill the proxy session, */
|
|
/* else change in packet length (in bytes) */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* ip(I) - pointer to packet header */
|
|
/* aps(I) - pointer to proxy session structure */
|
|
/* nat(I) - pointer to NAT session structure */
|
|
/* */
|
|
/* Given a presumed RPCB request, perform some minor tests and pass off */
|
|
/* for decoding. Also pass packet off for a rewrite if necessary. */
|
|
/* -------------------------------------------------------------------- */
|
|
int
|
|
ipf_p_rpcb_in(void *arg, fr_info_t *fin, ap_session_t *aps, nat_t *nat)
|
|
{
|
|
rpc_msg_t rpcmsg, *rm;
|
|
rpcb_session_t *rs;
|
|
u_int off, dlen;
|
|
mb_t *m;
|
|
int rv;
|
|
|
|
/* Disallow fragmented or illegally short packets. */
|
|
if ((fin->fin_flx & (FI_FRAG|FI_SHORT)) != 0)
|
|
return (APR_ERR(1));
|
|
|
|
/* Perform basic variable initialization. */
|
|
rs = (rpcb_session_t *)aps->aps_data;
|
|
|
|
m = fin->fin_m;
|
|
off = (char *)fin->fin_dp - (char *)fin->fin_ip;
|
|
off += sizeof(udphdr_t) + fin->fin_ipoff;
|
|
dlen = fin->fin_dlen - sizeof(udphdr_t);
|
|
|
|
/* Disallow packets outside legal range for supported requests. */
|
|
if ((dlen < RPCB_REQMIN) || (dlen > RPCB_REQMAX))
|
|
return (APR_ERR(1));
|
|
|
|
/* Copy packet over to convenience buffer. */
|
|
rm = &rpcmsg;
|
|
bzero((char *)rm, sizeof(*rm));
|
|
COPYDATA(m, off, dlen, (caddr_t)&rm->rm_msgbuf);
|
|
rm->rm_buflen = dlen;
|
|
|
|
/* Send off to decode request. */
|
|
rv = ipf_p_rpcb_decodereq(fin, nat, rs, rm);
|
|
|
|
switch(rv)
|
|
{
|
|
case -1:
|
|
return (APR_ERR(1));
|
|
/*NOTREACHED*/
|
|
break;
|
|
case 0:
|
|
break;
|
|
case 1:
|
|
rv = ipf_p_rpcb_modreq(fin, nat, rm, m, off);
|
|
break;
|
|
default:
|
|
/*CONSTANTCONDITION*/
|
|
IPF_PANIC(1, ("illegal rv %d (ipf_p_rpcb_req)", rv));
|
|
}
|
|
|
|
return (rv);
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_out */
|
|
/* Returns: int - APR_ERR(1) == drop the packet, */
|
|
/* APR_ERR(2) == kill the proxy session, */
|
|
/* else change in packet length (in bytes) */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* ip(I) - pointer to packet header */
|
|
/* aps(I) - pointer to proxy session structure */
|
|
/* nat(I) - pointer to NAT session structure */
|
|
/* */
|
|
/* Given a presumed RPCB reply, perform some minor tests and pass off */
|
|
/* for decoding. If the message indicates a successful request with */
|
|
/* valid addressing information, create NAT and state structures to */
|
|
/* allow direct communication between RPC client and server. */
|
|
/* -------------------------------------------------------------------- */
|
|
int
|
|
ipf_p_rpcb_out(void *arg, fr_info_t *fin, ap_session_t *aps, nat_t *nat)
|
|
{
|
|
rpc_msg_t rpcmsg, *rm;
|
|
rpcb_session_t *rs;
|
|
rpcb_xact_t *rx;
|
|
u_int off, dlen;
|
|
int rv, diff;
|
|
mb_t *m;
|
|
|
|
/* Disallow fragmented or illegally short packets. */
|
|
if ((fin->fin_flx & (FI_FRAG|FI_SHORT)) != 0)
|
|
return (APR_ERR(1));
|
|
|
|
/* Perform basic variable initialization. */
|
|
rs = (rpcb_session_t *)aps->aps_data;
|
|
rx = NULL;
|
|
|
|
m = fin->fin_m;
|
|
off = (char *)fin->fin_dp - (char *)fin->fin_ip;
|
|
off += sizeof(udphdr_t) + fin->fin_ipoff;
|
|
dlen = fin->fin_dlen - sizeof(udphdr_t);
|
|
diff = 0;
|
|
|
|
/* Disallow packets outside legal range for supported requests. */
|
|
if ((dlen < RPCB_REPMIN) || (dlen > RPCB_REPMAX))
|
|
return (APR_ERR(1));
|
|
|
|
/* Copy packet over to convenience buffer. */
|
|
rm = &rpcmsg;
|
|
bzero((char *)rm, sizeof(*rm));
|
|
COPYDATA(m, off, dlen, (caddr_t)&rm->rm_msgbuf);
|
|
rm->rm_buflen = dlen;
|
|
|
|
rx = NULL; /* XXX gcc */
|
|
|
|
/* Send off to decode reply. */
|
|
rv = ipf_p_rpcb_decoderep(fin, nat, rs, rm, &rx);
|
|
|
|
switch(rv)
|
|
{
|
|
case -1: /* Bad packet */
|
|
if (rx != NULL) {
|
|
MUTEX_ENTER(&rs->rs_rxlock);
|
|
ipf_p_rpcb_deref(rs, rx);
|
|
MUTEX_EXIT(&rs->rs_rxlock);
|
|
}
|
|
return (APR_ERR(1));
|
|
/*NOTREACHED*/
|
|
break;
|
|
case 0: /* Negative reply / request rejected */
|
|
break;
|
|
case 1: /* Positive reply */
|
|
/*
|
|
* With the IP address embedded in a GETADDR(LIST) reply,
|
|
* we'll need to rewrite the packet in the very possible
|
|
* event that the internal & external addresses aren't the
|
|
* same. (i.e., this box is either a router or rpcbind
|
|
* only listens on loopback.)
|
|
*/
|
|
if (nat->nat_odstaddr != nat->nat_ndstaddr) {
|
|
if (rx->rx_type == RPCB_RES_STRING)
|
|
diff = ipf_p_rpcb_modv3(fin, nat, rm, m, off);
|
|
else if (rx->rx_type == RPCB_RES_LIST)
|
|
diff = ipf_p_rpcb_modv4(fin, nat, rm, m, off);
|
|
}
|
|
break;
|
|
default:
|
|
/*CONSTANTCONDITION*/
|
|
IPF_PANIC(1, ("illegal rv %d (ipf_p_rpcb_decoderep)", rv));
|
|
}
|
|
|
|
if (rx != NULL) {
|
|
MUTEX_ENTER(&rs->rs_rxlock);
|
|
/* XXX Gross hack - I'm overloading the reference
|
|
* counter to deal with both threads and retransmitted
|
|
* requests. One deref signals that this thread is
|
|
* finished with rx, and the other signals that we've
|
|
* processed its reply.
|
|
*/
|
|
ipf_p_rpcb_deref(rs, rx);
|
|
ipf_p_rpcb_deref(rs, rx);
|
|
MUTEX_EXIT(&rs->rs_rxlock);
|
|
}
|
|
|
|
return (diff);
|
|
}
|
|
|
|
/*
|
|
* Private support subroutines
|
|
*/
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_flush */
|
|
/* Returns: void */
|
|
/* Parameters: rs(I) - pointer to RPCB session structure */
|
|
/* */
|
|
/* Simply flushes the list of outstanding transactions, if any. */
|
|
/* -------------------------------------------------------------------- */
|
|
static void
|
|
ipf_p_rpcb_flush(rpcb_session_t *rs)
|
|
{
|
|
rpcb_xact_t *r1, *r2;
|
|
|
|
r1 = rs->rs_rxlist;
|
|
if (r1 == NULL)
|
|
return;
|
|
|
|
while (r1 != NULL) {
|
|
r2 = r1;
|
|
r1 = r1->rx_next;
|
|
KFREE(r2);
|
|
}
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_decodereq */
|
|
/* Returns: int - -1 == bad request or critical failure, */
|
|
/* 0 == request successfully decoded, */
|
|
/* 1 == request successfully decoded; requires */
|
|
/* address rewrite/modification */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* nat(I) - pointer to NAT session structure */
|
|
/* rs(I) - pointer to RPCB session structure */
|
|
/* rm(I) - pointer to RPC message structure */
|
|
/* */
|
|
/* Take a presumed RPCB request, decode it, and store the results in */
|
|
/* the transaction list. If the internal target address needs to be */
|
|
/* modified, store its location in ptr. */
|
|
/* WARNING: It's the responsibility of the caller to make sure there */
|
|
/* is enough room in rs_buf for the basic RPC message "preamble". */
|
|
/* -------------------------------------------------------------------- */
|
|
static int
|
|
ipf_p_rpcb_decodereq(fr_info_t *fin, nat_t *nat, rpcb_session_t *rs,
|
|
rpc_msg_t *rm)
|
|
{
|
|
rpcb_args_t *ra;
|
|
u_32_t xdr, *p;
|
|
rpc_call_t *rc;
|
|
rpcb_xact_t rx;
|
|
int mod;
|
|
|
|
p = (u_32_t *)rm->rm_msgbuf;
|
|
mod = 0;
|
|
|
|
bzero((char *)&rx, sizeof(rx));
|
|
rc = &rm->rm_call;
|
|
|
|
rm->rm_xid = p;
|
|
rx.rx_xid = B(p++); /* Record this message's XID. */
|
|
|
|
/* Parse out and test the RPC header. */
|
|
if ((B(p++) != RPCB_CALL) ||
|
|
(B(p++) != RPCB_MSG_VERSION) ||
|
|
(B(p++) != RPCB_PROG))
|
|
return (-1);
|
|
|
|
/* Record the RPCB version and procedure. */
|
|
rc->rc_vers = p++;
|
|
rc->rc_proc = p++;
|
|
|
|
/* Bypass RPC authentication stuff. */
|
|
if (ipf_p_rpcb_skipauth(rm, &rc->rc_authcred, &p) != 0)
|
|
return (-1);
|
|
if (ipf_p_rpcb_skipauth(rm, &rc->rc_authverf, &p) != 0)
|
|
return (-1);
|
|
|
|
/* Compare RPCB version and procedure numbers. */
|
|
switch(B(rc->rc_vers))
|
|
{
|
|
case 2:
|
|
/* This proxy only supports PMAP_GETPORT. */
|
|
if (B(rc->rc_proc) != RPCB_GETPORT)
|
|
return (-1);
|
|
|
|
/* Portmap requests contain four 4 byte parameters. */
|
|
if (RPCB_BUF_EQ(rm, p, 16) == 0)
|
|
return (-1);
|
|
|
|
p += 2; /* Skip requested program and version numbers. */
|
|
|
|
/* Sanity check the requested protocol. */
|
|
xdr = B(p);
|
|
if (!(xdr == IPPROTO_UDP || xdr == IPPROTO_TCP))
|
|
return (-1);
|
|
|
|
rx.rx_type = RPCB_RES_PMAP;
|
|
rx.rx_proto = xdr;
|
|
break;
|
|
case 3:
|
|
case 4:
|
|
/* GETADDRLIST is exclusive to v4; GETADDR for v3 & v4 */
|
|
switch(B(rc->rc_proc))
|
|
{
|
|
case RPCB_GETADDR:
|
|
rx.rx_type = RPCB_RES_STRING;
|
|
rx.rx_proto = (u_int)fin->fin_p;
|
|
break;
|
|
case RPCB_GETADDRLIST:
|
|
if (B(rc->rc_vers) != 4)
|
|
return (-1);
|
|
rx.rx_type = RPCB_RES_LIST;
|
|
break;
|
|
default:
|
|
return (-1);
|
|
}
|
|
|
|
ra = &rc->rc_rpcbargs;
|
|
|
|
/* Decode the 'struct rpcb' request. */
|
|
if (ipf_p_rpcb_xdrrpcb(rm, p, ra) != 0)
|
|
return (-1);
|
|
|
|
/* Are the target address & port valid? */
|
|
if ((ra->ra_maddr.xu_ip != nat->nat_ndstaddr) ||
|
|
(ra->ra_maddr.xu_port != nat->nat_ndport))
|
|
return (-1);
|
|
|
|
/* Do we need to rewrite this packet? */
|
|
if ((nat->nat_ndstaddr != nat->nat_odstaddr) ||
|
|
(nat->nat_ndport != nat->nat_odport))
|
|
mod = 1;
|
|
break;
|
|
default:
|
|
return (-1);
|
|
}
|
|
|
|
MUTEX_ENTER(&rs->rs_rxlock);
|
|
if (ipf_p_rpcb_insert(rs, &rx) != 0) {
|
|
MUTEX_EXIT(&rs->rs_rxlock);
|
|
return (-1);
|
|
}
|
|
MUTEX_EXIT(&rs->rs_rxlock);
|
|
|
|
return (mod);
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_skipauth */
|
|
/* Returns: int -- -1 == illegal auth parameters (lengths) */
|
|
/* 0 == valid parameters, pointer advanced */
|
|
/* Parameters: rm(I) - pointer to RPC message structure */
|
|
/* auth(I) - pointer to RPC auth structure */
|
|
/* buf(IO) - pointer to location within convenience buffer */
|
|
/* */
|
|
/* Record auth data length & location of auth data, then advance past */
|
|
/* it. */
|
|
/* -------------------------------------------------------------------- */
|
|
static int
|
|
ipf_p_rpcb_skipauth(rpc_msg_t *rm, xdr_auth_t *auth, u_32_t **buf)
|
|
{
|
|
u_32_t *p, xdr;
|
|
|
|
p = *buf;
|
|
|
|
/* Make sure we have enough space for expected fixed auth parms. */
|
|
if (RPCB_BUF_GEQ(rm, p, 8) == 0)
|
|
return (-1);
|
|
|
|
p++; /* We don't care about auth_flavor. */
|
|
|
|
auth->xa_string.xs_len = p;
|
|
xdr = B(p++); /* Length of auth_data */
|
|
|
|
/* Test for absurdity / illegality of auth_data length. */
|
|
if ((XDRALIGN(xdr) < xdr) || (RPCB_BUF_GEQ(rm, p, XDRALIGN(xdr)) == 0))
|
|
return (-1);
|
|
|
|
auth->xa_string.xs_str = (char *)p;
|
|
|
|
p += XDRALIGN(xdr); /* Advance our location. */
|
|
|
|
*buf = (u_32_t *)p;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_insert */
|
|
/* Returns: int -- -1 == list insertion failed, */
|
|
/* 0 == item successfully added */
|
|
/* Parameters: rs(I) - pointer to RPCB session structure */
|
|
/* rx(I) - pointer to RPCB transaction structure */
|
|
/* -------------------------------------------------------------------- */
|
|
static int
|
|
ipf_p_rpcb_insert(rpcb_session_t *rs, rpcb_xact_t *rx)
|
|
{
|
|
rpcb_xact_t *rxp;
|
|
|
|
rxp = ipf_p_rpcb_lookup(rs, rx->rx_xid);
|
|
if (rxp != NULL) {
|
|
++rxp->rx_ref;
|
|
return (0);
|
|
}
|
|
|
|
if (V_rpcbcnt == RPCB_MAXREQS)
|
|
return (-1);
|
|
|
|
KMALLOC(rxp, rpcb_xact_t *);
|
|
if (rxp == NULL)
|
|
return (-1);
|
|
|
|
bcopy((char *)rx, (char *)rxp, sizeof(*rx));
|
|
|
|
if (rs->rs_rxlist != NULL)
|
|
rs->rs_rxlist->rx_pnext = &rxp->rx_next;
|
|
|
|
rxp->rx_pnext = &rs->rs_rxlist;
|
|
rxp->rx_next = rs->rs_rxlist;
|
|
rs->rs_rxlist = rxp;
|
|
|
|
rxp->rx_ref = 1;
|
|
|
|
++V_rpcbcnt;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_xdrrpcb */
|
|
/* Returns: int -- -1 == failure to properly decode the request */
|
|
/* 0 == rpcb successfully decoded */
|
|
/* Parameters: rs(I) - pointer to RPCB session structure */
|
|
/* p(I) - pointer to location within session buffer */
|
|
/* rpcb(O) - pointer to rpcb (xdr type) structure */
|
|
/* */
|
|
/* Decode a XDR encoded rpcb structure and record its contents in rpcb */
|
|
/* within only the context of TCP/UDP over IP networks. */
|
|
/* -------------------------------------------------------------------- */
|
|
static int
|
|
ipf_p_rpcb_xdrrpcb(rpc_msg_t *rm, u_32_t *p, rpcb_args_t *ra)
|
|
{
|
|
if (!RPCB_BUF_GEQ(rm, p, 20))
|
|
return (-1);
|
|
|
|
/* Bypass target program & version. */
|
|
p += 2;
|
|
|
|
/* Decode r_netid. Must be "tcp" or "udp". */
|
|
if (ipf_p_rpcb_getproto(rm, &ra->ra_netid, &p) != 0)
|
|
return (-1);
|
|
|
|
/* Decode r_maddr. */
|
|
if (ipf_p_rpcb_getuaddr(rm, &ra->ra_maddr, &p) != 0)
|
|
return (-1);
|
|
|
|
/* Advance to r_owner and make sure it's empty. */
|
|
if (!RPCB_BUF_EQ(rm, p, 4) || (B(p) != 0))
|
|
return (-1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_getuaddr */
|
|
/* Returns: int -- -1 == illegal string, */
|
|
/* 0 == string parsed; contents recorded */
|
|
/* Parameters: rm(I) - pointer to RPC message structure */
|
|
/* xu(I) - pointer to universal address structure */
|
|
/* p(IO) - pointer to location within message buffer */
|
|
/* */
|
|
/* Decode the IP address / port at p and record them in xu. */
|
|
/* -------------------------------------------------------------------- */
|
|
static int
|
|
ipf_p_rpcb_getuaddr(rpc_msg_t *rm, xdr_uaddr_t *xu, u_32_t **p)
|
|
{
|
|
char *c, *i, *b, *pp;
|
|
u_int d, dd, l, t;
|
|
char uastr[24];
|
|
|
|
/* Test for string length. */
|
|
if (!RPCB_BUF_GEQ(rm, *p, 4))
|
|
return (-1);
|
|
|
|
xu->xu_xslen = (*p)++;
|
|
xu->xu_xsstr = (char *)*p;
|
|
|
|
/* Length check */
|
|
l = B(xu->xu_xslen);
|
|
if (l < 11 || l > 23 || !RPCB_BUF_GEQ(rm, *p, XDRALIGN(l)))
|
|
return (-1);
|
|
|
|
/* Advance p */
|
|
*(char **)p += XDRALIGN(l);
|
|
|
|
/* Copy string to local buffer & terminate C style */
|
|
bcopy(xu->xu_xsstr, uastr, l);
|
|
uastr[l] = '\0';
|
|
|
|
i = (char *)&xu->xu_ip;
|
|
pp = (char *)&xu->xu_port;
|
|
|
|
/*
|
|
* Expected format: a.b.c.d.e.f where [a-d] correspond to bytes of
|
|
* an IP address and [ef] are the bytes of a L4 port.
|
|
*/
|
|
if (!(ISDIGIT(uastr[0]) && ISDIGIT(uastr[l-1])))
|
|
return (-1);
|
|
b = uastr;
|
|
for (c = &uastr[1], d = 0, dd = 0; c < &uastr[l-1]; c++) {
|
|
if (ISDIGIT(*c)) {
|
|
dd = 0;
|
|
continue;
|
|
}
|
|
if (*c == '.') {
|
|
if (dd != 0)
|
|
return (-1);
|
|
|
|
/* Check for ASCII byte. */
|
|
*c = '\0';
|
|
t = ipf_p_rpcb_atoi(b);
|
|
if (t > 255)
|
|
return (-1);
|
|
|
|
/* Aim b at beginning of the next byte. */
|
|
b = c + 1;
|
|
|
|
/* Switch off IP addr vs port parsing. */
|
|
if (d < 4)
|
|
i[d++] = t & 0xff;
|
|
else
|
|
pp[d++ - 4] = t & 0xff;
|
|
|
|
dd = 1;
|
|
continue;
|
|
}
|
|
return (-1);
|
|
}
|
|
if (d != 5) /* String must contain exactly 5 periods. */
|
|
return (-1);
|
|
|
|
/* Handle the last byte (port low byte) */
|
|
t = ipf_p_rpcb_atoi(b);
|
|
if (t > 255)
|
|
return (-1);
|
|
pp[d - 4] = t & 0xff;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_atoi (XXX should be generic for all proxies) */
|
|
/* Returns: int -- integer representation of supplied string */
|
|
/* Parameters: ptr(I) - input string */
|
|
/* */
|
|
/* Simple version of atoi(3) ripped from ip_rcmd_pxy.c. */
|
|
/* -------------------------------------------------------------------- */
|
|
static u_int
|
|
ipf_p_rpcb_atoi(char *ptr)
|
|
{
|
|
register char *s = ptr, c;
|
|
register u_int i = 0;
|
|
|
|
while (((c = *s++) != '\0') && ISDIGIT(c)) {
|
|
i *= 10;
|
|
i += c - '0';
|
|
}
|
|
return (i);
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_modreq */
|
|
/* Returns: int -- change in datagram length */
|
|
/* APR_ERR(2) - critical failure */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* nat(I) - pointer to NAT session */
|
|
/* rm(I) - pointer to RPC message structure */
|
|
/* m(I) - pointer to mbuf chain */
|
|
/* off(I) - current offset within mbuf chain */
|
|
/* */
|
|
/* When external and internal addresses differ, we rewrite the former */
|
|
/* with the latter. (This is exclusive to protocol versions 3 & 4). */
|
|
/* -------------------------------------------------------------------- */
|
|
static int
|
|
ipf_p_rpcb_modreq(fr_info_t *fin, nat_t *nat, rpc_msg_t *rm, mb_t *m,
|
|
u_int off)
|
|
{
|
|
u_int len, xlen, pos, bogo;
|
|
rpcb_args_t *ra;
|
|
char uaddr[24];
|
|
udphdr_t *udp;
|
|
char *i, *p;
|
|
int diff;
|
|
|
|
ra = &rm->rm_call.rc_rpcbargs;
|
|
i = (char *)&nat->nat_odstaddr;
|
|
p = (char *)&nat->nat_odport;
|
|
|
|
/* Form new string. */
|
|
bzero(uaddr, sizeof(uaddr)); /* Just in case we need padding. */
|
|
(void) snprintf(uaddr, sizeof(uaddr),
|
|
"%u.%u.%u.%u.%u.%u", i[0] & 0xff, i[1] & 0xff,
|
|
i[2] & 0xff, i[3] & 0xff, p[0] & 0xff, p[1] & 0xff);
|
|
len = strlen(uaddr);
|
|
xlen = XDRALIGN(len);
|
|
|
|
/* Determine mbuf offset to start writing to. */
|
|
pos = (char *)ra->ra_maddr.xu_xslen - rm->rm_msgbuf;
|
|
off += pos;
|
|
|
|
/* Write new string length. */
|
|
bogo = htonl(len);
|
|
COPYBACK(m, off, 4, (caddr_t)&bogo);
|
|
off += 4;
|
|
|
|
/* Write new string. */
|
|
COPYBACK(m, off, xlen, uaddr);
|
|
off += xlen;
|
|
|
|
/* Write in zero r_owner. */
|
|
bogo = 0;
|
|
COPYBACK(m, off, 4, (caddr_t)&bogo);
|
|
|
|
/* Determine difference in data lengths. */
|
|
diff = xlen - XDRALIGN(B(ra->ra_maddr.xu_xslen));
|
|
|
|
/*
|
|
* If our new string has a different length, make necessary
|
|
* adjustments.
|
|
*/
|
|
if (diff != 0) {
|
|
udp = fin->fin_dp;
|
|
udp->uh_ulen = htons(ntohs(udp->uh_ulen) + diff);
|
|
fin->fin_plen += diff;
|
|
fin->fin_ip->ip_len = htons(fin->fin_plen);
|
|
fin->fin_dlen += diff;
|
|
/* XXX Storage lengths. */
|
|
}
|
|
|
|
return (diff);
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_decoderep */
|
|
/* Returns: int - -1 == bad request or critical failure, */
|
|
/* 0 == valid, negative reply */
|
|
/* 1 == vaddlid, positive reply; needs no changes */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* nat(I) - pointer to NAT session structure */
|
|
/* rs(I) - pointer to RPCB session structure */
|
|
/* rm(I) - pointer to RPC message structure */
|
|
/* rxp(O) - pointer to RPCB transaction structure */
|
|
/* */
|
|
/* Take a presumed RPCB reply, extract the XID, search for the original */
|
|
/* request information, and determine whether the request was accepted */
|
|
/* or rejected. With a valid accepted reply, go ahead and create NAT */
|
|
/* and state entries, and finish up by rewriting the packet as */
|
|
/* required. */
|
|
/* */
|
|
/* WARNING: It's the responsibility of the caller to make sure there */
|
|
/* is enough room in rs_buf for the basic RPC message "preamble". */
|
|
/* -------------------------------------------------------------------- */
|
|
static int
|
|
ipf_p_rpcb_decoderep(fr_info_t *fin, nat_t *nat, rpcb_session_t *rs,
|
|
rpc_msg_t *rm, rpcb_xact_t **rxp)
|
|
{
|
|
rpcb_listp_t *rl;
|
|
rpcb_entry_t *re;
|
|
rpcb_xact_t *rx;
|
|
u_32_t xdr, *p;
|
|
rpc_resp_t *rr;
|
|
int rv, cnt;
|
|
|
|
p = (u_32_t *)rm->rm_msgbuf;
|
|
|
|
bzero((char *)&rx, sizeof(rx));
|
|
rr = &rm->rm_resp;
|
|
|
|
rm->rm_xid = p;
|
|
xdr = B(p++); /* Record this message's XID. */
|
|
|
|
/* Lookup XID */
|
|
MUTEX_ENTER(&rs->rs_rxlock);
|
|
if ((rx = ipf_p_rpcb_lookup(rs, xdr)) == NULL) {
|
|
MUTEX_EXIT(&rs->rs_rxlock);
|
|
return (-1);
|
|
}
|
|
++rx->rx_ref; /* per thread reference */
|
|
MUTEX_EXIT(&rs->rs_rxlock);
|
|
|
|
*rxp = rx;
|
|
|
|
/* Test call vs reply */
|
|
if (B(p++) != RPCB_REPLY)
|
|
return (-1);
|
|
|
|
/* Test reply_stat */
|
|
switch(B(p++))
|
|
{
|
|
case RPCB_MSG_DENIED:
|
|
return (0);
|
|
case RPCB_MSG_ACCEPTED:
|
|
break;
|
|
default:
|
|
return (-1);
|
|
}
|
|
|
|
/* Bypass RPC authentication stuff. */
|
|
if (ipf_p_rpcb_skipauth(rm, &rr->rr_authverf, &p) != 0)
|
|
return (-1);
|
|
|
|
/* Test accept status */
|
|
if (!RPCB_BUF_GEQ(rm, p, 4))
|
|
return (-1);
|
|
if (B(p++) != 0)
|
|
return (0);
|
|
|
|
/* Parse out the expected reply */
|
|
switch(rx->rx_type)
|
|
{
|
|
case RPCB_RES_PMAP:
|
|
/* There must be only one 4 byte argument. */
|
|
if (!RPCB_BUF_EQ(rm, p, 4))
|
|
return (-1);
|
|
|
|
rr->rr_v2 = p;
|
|
xdr = B(rr->rr_v2);
|
|
|
|
/* Reply w/ a 0 port indicates service isn't registered */
|
|
if (xdr == 0)
|
|
return (0);
|
|
|
|
/* Is the value sane? */
|
|
if (xdr > 65535)
|
|
return (-1);
|
|
|
|
/* Create NAT & state table entries. */
|
|
if (ipf_p_rpcb_getnat(fin, nat, rx->rx_proto, (u_int)xdr) != 0)
|
|
return (-1);
|
|
break;
|
|
case RPCB_RES_STRING:
|
|
/* Expecting a XDR string; need 4 bytes for length */
|
|
if (!RPCB_BUF_GEQ(rm, p, 4))
|
|
return (-1);
|
|
|
|
rr->rr_v3.xu_str.xs_len = p++;
|
|
rr->rr_v3.xu_str.xs_str = (char *)p;
|
|
|
|
xdr = B(rr->rr_v3.xu_xslen);
|
|
|
|
/* A null string indicates an unregistered service */
|
|
if ((xdr == 0) && RPCB_BUF_EQ(rm, p, 0))
|
|
return (0);
|
|
|
|
/* Decode the target IP address / port. */
|
|
if (ipf_p_rpcb_getuaddr(rm, &rr->rr_v3, &p) != 0)
|
|
return (-1);
|
|
|
|
/* Validate the IP address and port contained. */
|
|
if (nat->nat_odstaddr != rr->rr_v3.xu_ip)
|
|
return (-1);
|
|
|
|
/* Create NAT & state table entries. */
|
|
if (ipf_p_rpcb_getnat(fin, nat, rx->rx_proto,
|
|
(u_int)rr->rr_v3.xu_port) != 0)
|
|
return (-1);
|
|
break;
|
|
case RPCB_RES_LIST:
|
|
if (!RPCB_BUF_GEQ(rm, p, 4))
|
|
return (-1);
|
|
/* rpcb_entry_list_ptr */
|
|
switch(B(p))
|
|
{
|
|
case 0:
|
|
return (0);
|
|
/*NOTREACHED*/
|
|
break;
|
|
case 1:
|
|
break;
|
|
default:
|
|
return (-1);
|
|
}
|
|
rl = &rr->rr_v4;
|
|
rl->rl_list = p++;
|
|
cnt = 0;
|
|
|
|
for(;;) {
|
|
re = &rl->rl_entries[rl->rl_cnt];
|
|
if (ipf_p_rpcb_getuaddr(rm, &re->re_maddr, &p) != 0)
|
|
return (-1);
|
|
if (ipf_p_rpcb_getproto(rm, &re->re_netid, &p) != 0)
|
|
return (-1);
|
|
/* re_semantics & re_pfamily length */
|
|
if (!RPCB_BUF_GEQ(rm, p, 12))
|
|
return (-1);
|
|
p++; /* Skipping re_semantics. */
|
|
xdr = B(p++);
|
|
if ((xdr != 4) || strncmp((char *)p, "inet", 4))
|
|
return (-1);
|
|
p++;
|
|
if (ipf_p_rpcb_getproto(rm, &re->re_proto, &p) != 0)
|
|
return (-1);
|
|
if (!RPCB_BUF_GEQ(rm, p, 4))
|
|
return (-1);
|
|
re->re_more = p;
|
|
if (B(re->re_more) > 1) /* 0,1 only legal values */
|
|
return (-1);
|
|
++rl->rl_cnt;
|
|
++cnt;
|
|
if (B(re->re_more) == 0)
|
|
break;
|
|
/* Replies in max out at 2; TCP and/or UDP */
|
|
if (cnt > 2)
|
|
return (-1);
|
|
p++;
|
|
}
|
|
|
|
for(rl->rl_cnt = 0; rl->rl_cnt < cnt; rl->rl_cnt++) {
|
|
re = &rl->rl_entries[rl->rl_cnt];
|
|
rv = ipf_p_rpcb_getnat(fin, nat,
|
|
re->re_proto.xp_proto,
|
|
(u_int)re->re_maddr.xu_port);
|
|
if (rv != 0)
|
|
return (-1);
|
|
}
|
|
break;
|
|
default:
|
|
/*CONSTANTCONDITION*/
|
|
IPF_PANIC(1, ("illegal rx_type %d", rx->rx_type));
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_lookup */
|
|
/* Returns: rpcb_xact_t * - NULL == no matching record, */
|
|
/* else pointer to relevant entry */
|
|
/* Parameters: rs(I) - pointer to RPCB session */
|
|
/* xid(I) - XID to look for */
|
|
/* -------------------------------------------------------------------- */
|
|
static rpcb_xact_t *
|
|
ipf_p_rpcb_lookup(rpcb_session_t *rs, u_32_t xid)
|
|
{
|
|
rpcb_xact_t *rx;
|
|
|
|
if (rs->rs_rxlist == NULL)
|
|
return (NULL);
|
|
|
|
for (rx = rs->rs_rxlist; rx != NULL; rx = rx->rx_next)
|
|
if (rx->rx_xid == xid)
|
|
break;
|
|
|
|
return (rx);
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_deref */
|
|
/* Returns: (void) */
|
|
/* Parameters: rs(I) - pointer to RPCB session */
|
|
/* rx(I) - pointer to RPC transaction struct to remove */
|
|
/* force(I) - indicates to delete entry regardless of */
|
|
/* reference count */
|
|
/* Locking: rs->rs_rxlock must be held write only */
|
|
/* */
|
|
/* Free the RPCB transaction record rx from the chain of entries. */
|
|
/* -------------------------------------------------------------------- */
|
|
static void
|
|
ipf_p_rpcb_deref(rpcb_session_t *rs, rpcb_xact_t *rx)
|
|
{
|
|
rs = rs; /* LINT */
|
|
|
|
if (rx == NULL)
|
|
return;
|
|
|
|
if (--rx->rx_ref != 0)
|
|
return;
|
|
|
|
if (rx->rx_next != NULL)
|
|
rx->rx_next->rx_pnext = rx->rx_pnext;
|
|
|
|
*rx->rx_pnext = rx->rx_next;
|
|
|
|
KFREE(rx);
|
|
|
|
--V_rpcbcnt;
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_getproto */
|
|
/* Returns: int - -1 == illegal protocol/netid, */
|
|
/* 0 == legal protocol/netid */
|
|
/* Parameters: rm(I) - pointer to RPC message structure */
|
|
/* xp(I) - pointer to netid structure */
|
|
/* p(IO) - pointer to location within packet buffer */
|
|
/* */
|
|
/* Decode netid/proto stored at p and record its numeric value. */
|
|
/* -------------------------------------------------------------------- */
|
|
static int
|
|
ipf_p_rpcb_getproto(rpc_msg_t *rm, xdr_proto_t *xp, u_32_t **p)
|
|
{
|
|
u_int len;
|
|
|
|
/* Must have 4 bytes for length & 4 bytes for "tcp" or "udp". */
|
|
if (!RPCB_BUF_GEQ(rm, p, 8))
|
|
return (-1);
|
|
|
|
xp->xp_xslen = (*p)++;
|
|
xp->xp_xsstr = (char *)*p;
|
|
|
|
/* Test the string length. */
|
|
len = B(xp->xp_xslen);
|
|
if (len != 3)
|
|
return (-1);
|
|
|
|
/* Test the actual string & record the protocol accordingly. */
|
|
if (!strncmp((char *)xp->xp_xsstr, "tcp\0", 4))
|
|
xp->xp_proto = IPPROTO_TCP;
|
|
else if (!strncmp((char *)xp->xp_xsstr, "udp\0", 4))
|
|
xp->xp_proto = IPPROTO_UDP;
|
|
else {
|
|
return (-1);
|
|
}
|
|
|
|
/* Advance past the string. */
|
|
(*p)++;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_getnat */
|
|
/* Returns: int -- -1 == failed to create table entries, */
|
|
/* 0 == success */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* nat(I) - pointer to NAT table entry */
|
|
/* proto(I) - transport protocol for new entries */
|
|
/* port(I) - new port to use w/ wildcard table entries */
|
|
/* */
|
|
/* Create state and NAT entries to handle an anticipated connection */
|
|
/* attempt between RPC client and server. */
|
|
/* -------------------------------------------------------------------- */
|
|
static int
|
|
ipf_p_rpcb_getnat(fr_info_t *fin, nat_t *nat, u_int proto, u_int port)
|
|
{
|
|
ipf_main_softc_t *softc = fin->fin_main_soft;
|
|
ipnat_t *ipn, ipnat;
|
|
tcphdr_t tcp;
|
|
ipstate_t *is;
|
|
fr_info_t fi;
|
|
nat_t *natl;
|
|
int nflags;
|
|
|
|
ipn = nat->nat_ptr;
|
|
|
|
/* Generate dummy fr_info */
|
|
bcopy((char *)fin, (char *)&fi, sizeof(fi));
|
|
fi.fin_out = 0;
|
|
fi.fin_p = proto;
|
|
fi.fin_sport = 0;
|
|
fi.fin_dport = port & 0xffff;
|
|
fi.fin_flx |= FI_IGNORE;
|
|
fi.fin_saddr = nat->nat_osrcaddr;
|
|
fi.fin_daddr = nat->nat_odstaddr;
|
|
|
|
bzero((char *)&tcp, sizeof(tcp));
|
|
tcp.th_dport = htons(port);
|
|
|
|
if (proto == IPPROTO_TCP) {
|
|
tcp.th_win = htons(8192);
|
|
TCP_OFF_A(&tcp, sizeof(tcphdr_t) >> 2);
|
|
fi.fin_dlen = sizeof(tcphdr_t);
|
|
tcp.th_flags = TH_SYN;
|
|
nflags = NAT_TCP;
|
|
} else {
|
|
fi.fin_dlen = sizeof(udphdr_t);
|
|
nflags = NAT_UDP;
|
|
}
|
|
|
|
nflags |= SI_W_SPORT|NAT_SEARCH;
|
|
fi.fin_dp = &tcp;
|
|
fi.fin_plen = fi.fin_hlen + fi.fin_dlen;
|
|
|
|
/*
|
|
* Search for existing NAT & state entries. Pay close attention to
|
|
* mutexes / locks grabbed from lookup routines, as not doing so could
|
|
* lead to bad things.
|
|
*
|
|
* If successful, fr_stlookup returns with ipf_state locked. We have
|
|
* no use for this lock, so simply unlock it if necessary.
|
|
*/
|
|
is = ipf_state_lookup(&fi, &tcp, NULL);
|
|
if (is != NULL) {
|
|
RWLOCK_EXIT(&softc->ipf_state);
|
|
}
|
|
|
|
RWLOCK_EXIT(&softc->ipf_nat);
|
|
|
|
WRITE_ENTER(&softc->ipf_nat);
|
|
natl = ipf_nat_inlookup(&fi, nflags, proto, fi.fin_src, fi.fin_dst);
|
|
|
|
if ((natl != NULL) && (is != NULL)) {
|
|
MUTEX_DOWNGRADE(&softc->ipf_nat);
|
|
return (0);
|
|
}
|
|
|
|
/* Slightly modify the following structures for actual use in creating
|
|
* NAT and/or state entries. We're primarily concerned with stripping
|
|
* flags that may be detrimental to the creation process or simply
|
|
* shouldn't be associated with a table entry.
|
|
*/
|
|
fi.fin_fr = &rpcbfr;
|
|
fi.fin_flx &= ~FI_IGNORE;
|
|
nflags &= ~NAT_SEARCH;
|
|
|
|
if (natl == NULL) {
|
|
#ifdef USE_MUTEXES
|
|
ipf_nat_softc_t *softn = softc->ipf_nat_soft;
|
|
#endif
|
|
|
|
/* XXX Since we're just copying the original ipn contents
|
|
* back, would we be better off just sending a pointer to
|
|
* the 'temp' copy off to nat_new instead?
|
|
*/
|
|
/* Generate template/bogus NAT rule. */
|
|
bcopy((char *)ipn, (char *)&ipnat, sizeof(ipnat));
|
|
ipn->in_flags = nflags & IPN_TCPUDP;
|
|
ipn->in_apr = NULL;
|
|
ipn->in_pr[0] = proto;
|
|
ipn->in_pr[1] = proto;
|
|
ipn->in_dpmin = fi.fin_dport;
|
|
ipn->in_dpmax = fi.fin_dport;
|
|
ipn->in_dpnext = fi.fin_dport;
|
|
ipn->in_space = 1;
|
|
ipn->in_ippip = 1;
|
|
if (ipn->in_flags & IPN_FILTER) {
|
|
ipn->in_scmp = 0;
|
|
ipn->in_dcmp = 0;
|
|
}
|
|
ipn->in_plabel = -1;
|
|
|
|
/* Create NAT entry. return NULL if this fails. */
|
|
MUTEX_ENTER(&softn->ipf_nat_new);
|
|
natl = ipf_nat_add(&fi, ipn, NULL, nflags|SI_CLONE|NAT_SLAVE,
|
|
NAT_INBOUND);
|
|
MUTEX_EXIT(&softn->ipf_nat_new);
|
|
|
|
bcopy((char *)&ipnat, (char *)ipn, sizeof(ipnat));
|
|
|
|
if (natl == NULL) {
|
|
MUTEX_DOWNGRADE(&softc->ipf_nat);
|
|
return (-1);
|
|
}
|
|
|
|
natl->nat_ptr = ipn;
|
|
fi.fin_saddr = natl->nat_nsrcaddr;
|
|
fi.fin_daddr = natl->nat_ndstaddr;
|
|
ipn->in_use++;
|
|
(void) ipf_nat_proto(&fi, natl, nflags);
|
|
MUTEX_ENTER(&natl->nat_lock);
|
|
ipf_nat_update(&fi, natl);
|
|
MUTEX_EXIT(&natl->nat_lock);
|
|
}
|
|
MUTEX_DOWNGRADE(&softc->ipf_nat);
|
|
|
|
if (is == NULL) {
|
|
/* Create state entry. Return NULL if this fails. */
|
|
fi.fin_flx |= FI_NATED;
|
|
fi.fin_flx &= ~FI_STATE;
|
|
nflags &= NAT_TCPUDP;
|
|
nflags |= SI_W_SPORT|SI_CLONE;
|
|
|
|
if (ipf_state_add(softc, &fi, NULL, nflags) != 0) {
|
|
/*
|
|
* XXX nat_delete is private to ip_nat.c. Should
|
|
* check w/ Darren about this one.
|
|
*
|
|
* nat_delete(natl, NL_EXPIRE);
|
|
*/
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_modv3 */
|
|
/* Returns: int -- change in packet length */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* nat(I) - pointer to NAT session */
|
|
/* rm(I) - pointer to RPC message structure */
|
|
/* m(I) - pointer to mbuf chain */
|
|
/* off(I) - offset within mbuf chain */
|
|
/* */
|
|
/* Write a new universal address string to this packet, adjusting */
|
|
/* lengths as necessary. */
|
|
/* -------------------------------------------------------------------- */
|
|
static int
|
|
ipf_p_rpcb_modv3(fr_info_t *fin, nat_t *nat, rpc_msg_t *rm, mb_t *m,
|
|
u_int off)
|
|
{
|
|
u_int len, xlen, pos, bogo;
|
|
rpc_resp_t *rr;
|
|
char uaddr[24];
|
|
char *i, *p;
|
|
int diff;
|
|
|
|
rr = &rm->rm_resp;
|
|
i = (char *)&nat->nat_ndstaddr;
|
|
p = (char *)&rr->rr_v3.xu_port;
|
|
|
|
/* Form new string. */
|
|
bzero(uaddr, sizeof(uaddr)); /* Just in case we need padding. */
|
|
(void) snprintf(uaddr, sizeof(uaddr),
|
|
"%u.%u.%u.%u.%u.%u", i[0] & 0xff, i[1] & 0xff,
|
|
i[2] & 0xff, i[3] & 0xff, p[0] & 0xff, p[1] & 0xff);
|
|
len = strlen(uaddr);
|
|
xlen = XDRALIGN(len);
|
|
|
|
/* Determine mbuf offset to write to. */
|
|
pos = (char *)rr->rr_v3.xu_xslen - rm->rm_msgbuf;
|
|
off += pos;
|
|
|
|
/* Write new string length. */
|
|
bogo = htonl(len);
|
|
COPYBACK(m, off, 4, (caddr_t)&bogo);
|
|
off += 4;
|
|
|
|
/* Write new string. */
|
|
COPYBACK(m, off, xlen, uaddr);
|
|
|
|
/* Determine difference in data lengths. */
|
|
diff = xlen - XDRALIGN(B(rr->rr_v3.xu_xslen));
|
|
|
|
/*
|
|
* If our new string has a different length, make necessary
|
|
* adjustments.
|
|
*/
|
|
if (diff != 0)
|
|
ipf_p_rpcb_fixlen(fin, diff);
|
|
|
|
return (diff);
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_modv4 */
|
|
/* Returns: int -- change in packet length */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* nat(I) - pointer to NAT session */
|
|
/* rm(I) - pointer to RPC message structure */
|
|
/* m(I) - pointer to mbuf chain */
|
|
/* off(I) - offset within mbuf chain */
|
|
/* */
|
|
/* Write new rpcb_entry list, adjusting lengths as necessary. */
|
|
/* -------------------------------------------------------------------- */
|
|
static int
|
|
ipf_p_rpcb_modv4(fr_info_t *fin, nat_t *nat, rpc_msg_t *rm, mb_t *m,
|
|
u_int off)
|
|
{
|
|
u_int len, xlen, pos, bogo;
|
|
rpcb_listp_t *rl;
|
|
rpcb_entry_t *re;
|
|
rpc_resp_t *rr;
|
|
char uaddr[24];
|
|
int diff, cnt;
|
|
char *i, *p;
|
|
|
|
diff = 0;
|
|
rr = &rm->rm_resp;
|
|
rl = &rr->rr_v4;
|
|
|
|
i = (char *)&nat->nat_ndstaddr;
|
|
|
|
/* Determine mbuf offset to write to. */
|
|
re = &rl->rl_entries[0];
|
|
pos = (char *)re->re_maddr.xu_xslen - rm->rm_msgbuf;
|
|
off += pos;
|
|
|
|
for (cnt = 0; cnt < rl->rl_cnt; cnt++) {
|
|
re = &rl->rl_entries[cnt];
|
|
p = (char *)&re->re_maddr.xu_port;
|
|
|
|
/* Form new string. */
|
|
bzero(uaddr, sizeof(uaddr)); /* Just in case we need
|
|
padding. */
|
|
(void) snprintf(uaddr, sizeof(uaddr),
|
|
"%u.%u.%u.%u.%u.%u", i[0] & 0xff,
|
|
i[1] & 0xff, i[2] & 0xff, i[3] & 0xff,
|
|
p[0] & 0xff, p[1] & 0xff);
|
|
len = strlen(uaddr);
|
|
xlen = XDRALIGN(len);
|
|
|
|
/* Write new string length. */
|
|
bogo = htonl(len);
|
|
COPYBACK(m, off, 4, (caddr_t)&bogo);
|
|
off += 4;
|
|
|
|
/* Write new string. */
|
|
COPYBACK(m, off, xlen, uaddr);
|
|
off += xlen;
|
|
|
|
/* Record any change in length. */
|
|
diff += xlen - XDRALIGN(B(re->re_maddr.xu_xslen));
|
|
|
|
/* If the length changed, copy back the rest of this entry. */
|
|
len = ((char *)re->re_more + 4) -
|
|
(char *)re->re_netid.xp_xslen;
|
|
if (diff != 0) {
|
|
COPYBACK(m, off, len, (caddr_t)re->re_netid.xp_xslen);
|
|
}
|
|
off += len;
|
|
}
|
|
|
|
/*
|
|
* If our new string has a different length, make necessary
|
|
* adjustments.
|
|
*/
|
|
if (diff != 0)
|
|
ipf_p_rpcb_fixlen(fin, diff);
|
|
|
|
return (diff);
|
|
}
|
|
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Function: ipf_p_rpcb_fixlen */
|
|
/* Returns: (void) */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* len(I) - change in packet length */
|
|
/* */
|
|
/* Adjust various packet related lengths held in structure and packet */
|
|
/* header fields. */
|
|
/* -------------------------------------------------------------------- */
|
|
static void
|
|
ipf_p_rpcb_fixlen(fr_info_t *fin, int len)
|
|
{
|
|
udphdr_t *udp;
|
|
|
|
udp = fin->fin_dp;
|
|
udp->uh_ulen = htons(ntohs(udp->uh_ulen) + len);
|
|
fin->fin_plen += len;
|
|
fin->fin_ip->ip_len = htons(fin->fin_plen);
|
|
fin->fin_dlen += len;
|
|
}
|
|
|
|
#undef B
|