diff options
Diffstat (limited to 'mdk-stage1/ppp/pppd/ipxcp.c')
| -rw-r--r-- | mdk-stage1/ppp/pppd/ipxcp.c | 1570 |
1 files changed, 1570 insertions, 0 deletions
diff --git a/mdk-stage1/ppp/pppd/ipxcp.c b/mdk-stage1/ppp/pppd/ipxcp.c new file mode 100644 index 000000000..f9a12b934 --- /dev/null +++ b/mdk-stage1/ppp/pppd/ipxcp.c @@ -0,0 +1,1570 @@ +/* + * ipxcp.c - PPP IPX Control Protocol. + * + * Copyright (c) 1989 Carnegie Mellon University. + * All rights reserved. + * + * Redistribution and use in source and binary forms are permitted + * provided that the above copyright notice and this paragraph are + * duplicated in all such forms and that any documentation, + * advertising materials, and other materials related to such + * distribution and use acknowledge that the software was developed + * by Carnegie Mellon University. The name of the + * University may not be used to endorse or promote products derived + * from this software without specific prior written permission. + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +#ifdef IPX_CHANGE + +#define RCSID "$Id$" + +/* + * TODO: + */ + +#include <stdio.h> +#include <string.h> +#include <unistd.h> +#include <ctype.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> + +#include "pppd.h" +#include "fsm.h" +#include "ipxcp.h" +#include "pathnames.h" +#include "magic.h" + +static const char rcsid[] = RCSID; + +/* global vars */ +ipxcp_options ipxcp_wantoptions[NUM_PPP]; /* Options that we want to request */ +ipxcp_options ipxcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */ +ipxcp_options ipxcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */ +ipxcp_options ipxcp_hisoptions[NUM_PPP]; /* Options that we ack'd */ + +#define wo (&ipxcp_wantoptions[0]) +#define ao (&ipxcp_allowoptions[0]) +#define go (&ipxcp_gotoptions[0]) +#define ho (&ipxcp_hisoptions[0]) + +/* + * Callbacks for fsm code. (CI = Configuration Information) + */ +static void ipxcp_resetci __P((fsm *)); /* Reset our CI */ +static int ipxcp_cilen __P((fsm *)); /* Return length of our CI */ +static void ipxcp_addci __P((fsm *, u_char *, int *)); /* Add our CI */ +static int ipxcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */ +static int ipxcp_nakci __P((fsm *, u_char *, int)); /* Peer nak'd our CI */ +static int ipxcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */ +static int ipxcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */ +static void ipxcp_up __P((fsm *)); /* We're UP */ +static void ipxcp_down __P((fsm *)); /* We're DOWN */ +static void ipxcp_finished __P((fsm *)); /* Don't need lower layer */ +static void ipxcp_script __P((fsm *, char *)); /* Run an up/down script */ + +fsm ipxcp_fsm[NUM_PPP]; /* IPXCP fsm structure */ + +static fsm_callbacks ipxcp_callbacks = { /* IPXCP callback routines */ + ipxcp_resetci, /* Reset our Configuration Information */ + ipxcp_cilen, /* Length of our Configuration Information */ + ipxcp_addci, /* Add our Configuration Information */ + ipxcp_ackci, /* ACK our Configuration Information */ + ipxcp_nakci, /* NAK our Configuration Information */ + ipxcp_rejci, /* Reject our Configuration Information */ + ipxcp_reqci, /* Request peer's Configuration Information */ + ipxcp_up, /* Called when fsm reaches OPENED state */ + ipxcp_down, /* Called when fsm leaves OPENED state */ + NULL, /* Called when we want the lower layer up */ + ipxcp_finished, /* Called when we want the lower layer down */ + NULL, /* Called when Protocol-Reject received */ + NULL, /* Retransmission is necessary */ + NULL, /* Called to handle protocol-specific codes */ + "IPXCP" /* String name of protocol */ +}; + +/* + * Command-line options. + */ +static int setipxnode __P((char **)); +static void printipxnode __P((option_t *, + void (*)(void *, char *, ...), void *)); +static int setipxname __P((char **)); + +static option_t ipxcp_option_list[] = { + { "ipx", o_bool, &ipxcp_protent.enabled_flag, + "Enable IPXCP (and IPX)", OPT_PRIO | 1 }, + { "+ipx", o_bool, &ipxcp_protent.enabled_flag, + "Enable IPXCP (and IPX)", OPT_PRIOSUB | OPT_ALIAS | 1 }, + { "noipx", o_bool, &ipxcp_protent.enabled_flag, + "Disable IPXCP (and IPX)", OPT_PRIOSUB }, + { "-ipx", o_bool, &ipxcp_protent.enabled_flag, + "Disable IPXCP (and IPX)", OPT_PRIOSUB | OPT_ALIAS }, + + { "ipx-network", o_uint32, &ipxcp_wantoptions[0].our_network, + "Set our IPX network number", OPT_PRIO, &ipxcp_wantoptions[0].neg_nn }, + + { "ipxcp-accept-network", o_bool, &ipxcp_wantoptions[0].accept_network, + "Accept peer IPX network number", 1, + &ipxcp_allowoptions[0].accept_network }, + + { "ipx-node", o_special, (void *)setipxnode, + "Set IPX node number", OPT_A2PRINTER, (void *)printipxnode }, + + { "ipxcp-accept-local", o_bool, &ipxcp_wantoptions[0].accept_local, + "Accept our IPX address", 1, + &ipxcp_allowoptions[0].accept_local }, + + { "ipxcp-accept-remote", o_bool, &ipxcp_wantoptions[0].accept_remote, + "Accept peer's IPX address", 1, + &ipxcp_allowoptions[0].accept_remote }, + + { "ipx-routing", o_int, &ipxcp_wantoptions[0].router, + "Set IPX routing proto number", OPT_PRIO, + &ipxcp_wantoptions[0].neg_router }, + + { "ipx-router-name", o_special, setipxname, + "Set IPX router name", OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, + &ipxcp_wantoptions[0].name }, + + { "ipxcp-restart", o_int, &ipxcp_fsm[0].timeouttime, + "Set timeout for IPXCP", OPT_PRIO }, + { "ipxcp-max-terminate", o_int, &ipxcp_fsm[0].maxtermtransmits, + "Set max #xmits for IPXCP term-reqs", OPT_PRIO }, + { "ipxcp-max-configure", o_int, &ipxcp_fsm[0].maxconfreqtransmits, + "Set max #xmits for IPXCP conf-reqs", OPT_PRIO }, + { "ipxcp-max-failure", o_int, &ipxcp_fsm[0].maxnakloops, + "Set max #conf-naks for IPXCP", OPT_PRIO }, + + { NULL } +}; + +/* + * Protocol entry points. + */ + +static void ipxcp_init __P((int)); +static void ipxcp_open __P((int)); +static void ipxcp_close __P((int, char *)); +static void ipxcp_lowerup __P((int)); +static void ipxcp_lowerdown __P((int)); +static void ipxcp_input __P((int, u_char *, int)); +static void ipxcp_protrej __P((int)); +static int ipxcp_printpkt __P((u_char *, int, + void (*) __P((void *, char *, ...)), void *)); + +struct protent ipxcp_protent = { + PPP_IPXCP, + ipxcp_init, + ipxcp_input, + ipxcp_protrej, + ipxcp_lowerup, + ipxcp_lowerdown, + ipxcp_open, + ipxcp_close, + ipxcp_printpkt, + NULL, + 0, + "IPXCP", + "IPX", + ipxcp_option_list, + NULL, + NULL, + NULL +}; + +/* + * Lengths of configuration options. + */ + +#define CILEN_VOID 2 +#define CILEN_COMPLETE 2 /* length of complete option */ +#define CILEN_NETN 6 /* network number length option */ +#define CILEN_NODEN 8 /* node number length option */ +#define CILEN_PROTOCOL 4 /* Minimum length of routing protocol */ +#define CILEN_NAME 3 /* Minimum length of router name */ +#define CILEN_COMPRESS 4 /* Minimum length of compression protocol */ + +#define CODENAME(x) ((x) == CONFACK ? "ACK" : \ + (x) == CONFNAK ? "NAK" : "REJ") + +static int ipxcp_is_up; + +static char *ipx_ntoa __P((u_int32_t)); + +/* Used in printing the node number */ +#define NODE(base) base[0], base[1], base[2], base[3], base[4], base[5] + +/* Used to generate the proper bit mask */ +#define BIT(num) (1 << (num)) + +/* + * Convert from internal to external notation + */ + +static short int +to_external(internal) +short int internal; +{ + short int external; + + if (internal & BIT(IPX_NONE) ) + external = IPX_NONE; + else + external = RIP_SAP; + + return external; +} + +/* + * Make a string representation of a network IP address. + */ + +static char * +ipx_ntoa(ipxaddr) +u_int32_t ipxaddr; +{ + static char b[64]; + slprintf(b, sizeof(b), "%x", ipxaddr); + return b; +} + + +static u_char * +setipxnodevalue(src,dst) +u_char *src, *dst; +{ + int indx; + int item; + + for (;;) { + if (!isxdigit (*src)) + break; + + for (indx = 0; indx < 5; ++indx) { + dst[indx] <<= 4; + dst[indx] |= (dst[indx + 1] >> 4) & 0x0F; + } + + item = toupper (*src) - '0'; + if (item > 9) + item -= 7; + + dst[5] = (dst[5] << 4) | item; + ++src; + } + return src; +} + +static int ipx_prio_our, ipx_prio_his; + +static int +setipxnode(argv) + char **argv; +{ + char *end; + int have_his = 0; + u_char our_node[6]; + u_char his_node[6]; + + memset (our_node, 0, 6); + memset (his_node, 0, 6); + + end = setipxnodevalue (*argv, our_node); + if (*end == ':') { + have_his = 1; + end = setipxnodevalue (++end, his_node); + } + + if (*end == '\0') { + ipxcp_wantoptions[0].neg_node = 1; + if (option_priority >= ipx_prio_our) { + memcpy(&ipxcp_wantoptions[0].our_node[0], our_node, 6); + ipx_prio_our = option_priority; + } + if (have_his && option_priority >= ipx_prio_his) { + memcpy(&ipxcp_wantoptions[0].his_node[0], his_node, 6); + ipx_prio_his = option_priority; + } + return 1; + } + + option_error("invalid parameter '%s' for ipx-node option", *argv); + return 0; +} + +static void +printipxnode(opt, printer, arg) + option_t *opt; + void (*printer) __P((void *, char *, ...)); + void *arg; +{ + unsigned char *p; + + p = ipxcp_wantoptions[0].our_node; + if (ipx_prio_our) + printer(arg, "%.2x%.2x%.2x%.2x%.2x%.2x", + p[0], p[1], p[2], p[3], p[4], p[5]); + printer(arg, ":"); + p = ipxcp_wantoptions[0].his_node; + if (ipx_prio_his) + printer(arg, "%.2x%.2x%.2x%.2x%.2x%.2x", + p[0], p[1], p[2], p[3], p[4], p[5]); +} + +static int +setipxname (argv) + char **argv; +{ + char *dest = ipxcp_wantoptions[0].name; + char *src = *argv; + int count; + char ch; + + ipxcp_wantoptions[0].neg_name = 1; + ipxcp_allowoptions[0].neg_name = 1; + memset (dest, '\0', sizeof (ipxcp_wantoptions[0].name)); + + count = 0; + while (*src) { + ch = *src++; + if (! isalnum (ch) && ch != '_') { + option_error("IPX router name must be alphanumeric or _"); + return 0; + } + + if (count >= sizeof (ipxcp_wantoptions[0].name) - 1) { + option_error("IPX router name is limited to %d characters", + sizeof (ipxcp_wantoptions[0].name) - 1); + return 0; + } + + dest[count++] = toupper (ch); + } + dest[count] = 0; + + return 1; +} + +/* + * ipxcp_init - Initialize IPXCP. + */ +static void +ipxcp_init(unit) + int unit; +{ + fsm *f = &ipxcp_fsm[unit]; + + f->unit = unit; + f->protocol = PPP_IPXCP; + f->callbacks = &ipxcp_callbacks; + fsm_init(&ipxcp_fsm[unit]); + + memset (wo->name, 0, sizeof (wo->name)); + memset (wo->our_node, 0, sizeof (wo->our_node)); + memset (wo->his_node, 0, sizeof (wo->his_node)); + + wo->neg_nn = 1; + wo->neg_complete = 1; + wo->network = 0; + + ao->neg_node = 1; + ao->neg_nn = 1; + ao->neg_name = 1; + ao->neg_complete = 1; + ao->neg_router = 1; + + ao->accept_local = 0; + ao->accept_remote = 0; + ao->accept_network = 0; + + wo->tried_rip = 0; + wo->tried_nlsp = 0; +} + +/* + * Copy the node number + */ + +static void +copy_node (src, dst) +u_char *src, *dst; +{ + memcpy (dst, src, sizeof (ipxcp_wantoptions[0].our_node)); +} + +/* + * Compare node numbers + */ + +static int +compare_node (src, dst) +u_char *src, *dst; +{ + return memcmp (dst, src, sizeof (ipxcp_wantoptions[0].our_node)) == 0; +} + +/* + * Is the node number zero? + */ + +static int +zero_node (node) +u_char *node; +{ + int indx; + for (indx = 0; indx < sizeof (ipxcp_wantoptions[0].our_node); ++indx) + if (node [indx] != 0) + return 0; + return 1; +} + +/* + * Increment the node number + */ + +static void +inc_node (node) +u_char *node; +{ + u_char *outp; + u_int32_t magic_num; + + outp = node; + magic_num = magic(); + *outp++ = '\0'; + *outp++ = '\0'; + PUTLONG (magic_num, outp); +} + +/* + * ipxcp_open - IPXCP is allowed to come up. + */ +static void +ipxcp_open(unit) + int unit; +{ + fsm_open(&ipxcp_fsm[unit]); +} + +/* + * ipxcp_close - Take IPXCP down. + */ +static void +ipxcp_close(unit, reason) + int unit; + char *reason; +{ + fsm_close(&ipxcp_fsm[unit], reason); +} + + +/* + * ipxcp_lowerup - The lower layer is up. + */ +static void +ipxcp_lowerup(unit) + int unit; +{ + fsm_lowerup(&ipxcp_fsm[unit]); +} + + +/* + * ipxcp_lowerdown - The lower layer is down. + */ +static void +ipxcp_lowerdown(unit) + int unit; +{ + fsm_lowerdown(&ipxcp_fsm[unit]); +} + + +/* + * ipxcp_input - Input IPXCP packet. + */ +static void +ipxcp_input(unit, p, len) + int unit; + u_char *p; + int len; +{ + fsm_input(&ipxcp_fsm[unit], p, len); +} + + +/* + * ipxcp_protrej - A Protocol-Reject was received for IPXCP. + * + * Pretend the lower layer went down, so we shut up. + */ +static void +ipxcp_protrej(unit) + int unit; +{ + fsm_lowerdown(&ipxcp_fsm[unit]); +} + + +/* + * ipxcp_resetci - Reset our CI. + */ +static void +ipxcp_resetci(f) + fsm *f; +{ + wo->req_node = wo->neg_node && ao->neg_node; + wo->req_nn = wo->neg_nn && ao->neg_nn; + + if (wo->our_network == 0) { + wo->neg_node = 1; + ao->accept_network = 1; + } +/* + * If our node number is zero then change it. + */ + if (zero_node (wo->our_node)) { + inc_node (wo->our_node); + ao->accept_local = 1; + wo->neg_node = 1; + } +/* + * If his node number is zero then change it. + */ + if (zero_node (wo->his_node)) { + inc_node (wo->his_node); + ao->accept_remote = 1; + } +/* + * If no routing agent was specified then we do RIP/SAP according to the + * RFC documents. If you have specified something then OK. Otherwise, we + * do RIP/SAP. + */ + if (ao->router == 0) { + ao->router |= BIT(RIP_SAP); + wo->router |= BIT(RIP_SAP); + } + + /* Always specify a routing protocol unless it was REJected. */ + wo->neg_router = 1; +/* + * Start with these default values + */ + *go = *wo; +} + +/* + * ipxcp_cilen - Return length of our CI. + */ + +static int +ipxcp_cilen(f) + fsm *f; +{ + int len; + + len = go->neg_nn ? CILEN_NETN : 0; + len += go->neg_node ? CILEN_NODEN : 0; + len += go->neg_name ? CILEN_NAME + strlen (go->name) - 1 : 0; + + /* RFC says that defaults should not be included. */ + if (go->neg_router && to_external(go->router) != RIP_SAP) + len += CILEN_PROTOCOL; + + return (len); +} + + +/* + * ipxcp_addci - Add our desired CIs to a packet. + */ +static void +ipxcp_addci(f, ucp, lenp) + fsm *f; + u_char *ucp; + int *lenp; +{ +/* + * Add the options to the record. + */ + if (go->neg_nn) { + PUTCHAR (IPX_NETWORK_NUMBER, ucp); + PUTCHAR (CILEN_NETN, ucp); + PUTLONG (go->our_network, ucp); + } + + if (go->neg_node) { + int indx; + PUTCHAR (IPX_NODE_NUMBER, ucp); + PUTCHAR (CILEN_NODEN, ucp); + for (indx = 0; indx < sizeof (go->our_node); ++indx) + PUTCHAR (go->our_node[indx], ucp); + } + + if (go->neg_name) { + int cilen = strlen (go->name); + int indx; + PUTCHAR (IPX_ROUTER_NAME, ucp); + PUTCHAR (CILEN_NAME + cilen - 1, ucp); + for (indx = 0; indx < cilen; ++indx) + PUTCHAR (go->name [indx], ucp); + } + + if (go->neg_router) { + short external = to_external (go->router); + if (external != RIP_SAP) { + PUTCHAR (IPX_ROUTER_PROTOCOL, ucp); + PUTCHAR (CILEN_PROTOCOL, ucp); + PUTSHORT (external, ucp); + } + } +} + +/* + * ipxcp_ackci - Ack our CIs. + * + * Returns: + * 0 - Ack was bad. + * 1 - Ack was good. + */ +static int +ipxcp_ackci(f, p, len) + fsm *f; + u_char *p; + int len; +{ + u_short cilen, citype, cishort; + u_char cichar; + u_int32_t cilong; + +#define ACKCIVOID(opt, neg) \ + if (neg) { \ + if ((len -= CILEN_VOID) < 0) \ + break; \ + GETCHAR(citype, p); \ + GETCHAR(cilen, p); \ + if (cilen != CILEN_VOID || \ + citype != opt) \ + break; \ + } + +#define ACKCICOMPLETE(opt,neg) ACKCIVOID(opt, neg) + +#define ACKCICHARS(opt, neg, val, cnt) \ + if (neg) { \ + int indx, count = cnt; \ + len -= (count + 2); \ + if (len < 0) \ + break; \ + GETCHAR(citype, p); \ + GETCHAR(cilen, p); \ + if (cilen != (count + 2) || \ + citype != opt) \ + break; \ + for (indx = 0; indx < count; ++indx) {\ + GETCHAR(cichar, p); \ + if (cichar != ((u_char *) &val)[indx]) \ + break; \ + }\ + if (indx != count) \ + break; \ + } + +#define ACKCINODE(opt,neg,val) ACKCICHARS(opt,neg,val,sizeof(val)) +#define ACKCINAME(opt,neg,val) ACKCICHARS(opt,neg,val,strlen(val)) + +#define ACKCINETWORK(opt, neg, val) \ + if (neg) { \ + if ((len -= CILEN_NETN) < 0) \ + break; \ + GETCHAR(citype, p); \ + GETCHAR(cilen, p); \ + if (cilen != CILEN_NETN || \ + citype != opt) \ + break; \ + GETLONG(cilong, p); \ + if (cilong != val) \ + break; \ + } + +#define ACKCIPROTO(opt, neg, val) \ + if (neg) { \ + if (len < 2) \ + break; \ + GETCHAR(citype, p); \ + GETCHAR(cilen, p); \ + if (cilen != CILEN_PROTOCOL || citype != opt) \ + break; \ + len -= cilen; \ + if (len < 0) \ + break; \ + GETSHORT(cishort, p); \ + if (cishort != to_external (val) || cishort == RIP_SAP) \ + break; \ + } +/* + * Process the ACK frame in the order in which the frame was assembled + */ + do { + ACKCINETWORK (IPX_NETWORK_NUMBER, go->neg_nn, go->our_network); + ACKCINODE (IPX_NODE_NUMBER, go->neg_node, go->our_node); + ACKCINAME (IPX_ROUTER_NAME, go->neg_name, go->name); + if (len > 0) + ACKCIPROTO (IPX_ROUTER_PROTOCOL, go->neg_router, go->router); +/* + * This is the end of the record. + */ + if (len == 0) + return (1); + } while (0); +/* + * The frame is invalid + */ + IPXCPDEBUG(("ipxcp_ackci: received bad Ack!")); + return (0); +} + +/* + * ipxcp_nakci - Peer has sent a NAK for some of our CIs. + * This should not modify any state if the Nak is bad + * or if IPXCP is in the OPENED state. + * + * Returns: + * 0 - Nak was bad. + * 1 - Nak was good. + */ + +static int +ipxcp_nakci(f, p, len) + fsm *f; + u_char *p; + int len; +{ + u_char citype, cilen, *next; + u_short s; + u_int32_t l; + ipxcp_options no; /* options we've seen Naks for */ + ipxcp_options try; /* options to request next time */ + + BZERO(&no, sizeof(no)); + try = *go; + + while (len > CILEN_VOID) { + GETCHAR (citype, p); + GETCHAR (cilen, p); + len -= cilen; + if (len < 0) + goto bad; + next = &p [cilen - CILEN_VOID]; + + switch (citype) { + case IPX_NETWORK_NUMBER: + if (!go->neg_nn || no.neg_nn || (cilen != CILEN_NETN)) + goto bad; + no.neg_nn = 1; + + GETLONG(l, p); + if (l && ao->accept_network) + try.our_network = l; + break; + + case IPX_NODE_NUMBER: + if (!go->neg_node || no.neg_node || (cilen != CILEN_NODEN)) + goto bad; + no.neg_node = 1; + + if (!zero_node (p) && ao->accept_local && + ! compare_node (p, ho->his_node)) + copy_node (p, try.our_node); + break; + + /* This has never been sent. Ignore the NAK frame */ + case IPX_COMPRESSION_PROTOCOL: + goto bad; + + case IPX_ROUTER_PROTOCOL: + if (!go->neg_router || (cilen < CILEN_PROTOCOL)) + goto bad; + + GETSHORT (s, p); + if (s > 15) /* This is just bad, but ignore for now. */ + break; + + s = BIT(s); + if (no.router & s) /* duplicate NAKs are always bad */ + goto bad; + + if (no.router == 0) /* Reset on first NAK only */ + try.router = 0; + + no.router |= s; + try.router |= s; + try.neg_router = 1; + break; + + /* These, according to the RFC, must never be NAKed. */ + case IPX_ROUTER_NAME: + case IPX_COMPLETE: + goto bad; + + /* These are for options which we have not seen. */ + default: + break; + } + p = next; + } + + /* + * Do not permit the peer to force a router protocol which we do not + * support. However, default to the condition that will accept "NONE". + */ + try.router &= (ao->router | BIT(IPX_NONE)); + if (try.router == 0 && ao->router != 0) + try.router = BIT(IPX_NONE); + + if (try.router != 0) + try.neg_router = 1; + + /* + * OK, the Nak is good. Now we can update state. + * If there are any options left, we ignore them. + */ + if (f->state != OPENED) + *go = try; + + return 1; + +bad: + IPXCPDEBUG(("ipxcp_nakci: received bad Nak!")); + return 0; +} + +/* + * ipxcp_rejci - Reject some of our CIs. + */ +static int +ipxcp_rejci(f, p, len) + fsm *f; + u_char *p; + int len; +{ + u_short cilen, citype, cishort; + u_char cichar; + u_int32_t cilong; + ipxcp_options try; /* options to request next time */ + +#define REJCINETWORK(opt, neg, val) \ + if (neg && p[0] == opt) { \ + if ((len -= CILEN_NETN) < 0) \ + break; \ + GETCHAR(citype, p); \ + GETCHAR(cilen, p); \ + if (cilen != CILEN_NETN || \ + citype != opt) \ + break; \ + GETLONG(cilong, p); \ + if (cilong != val) \ + break; \ + neg = 0; \ + } + +#define REJCICHARS(opt, neg, val, cnt) \ + if (neg && p[0] == opt) { \ + int indx, count = cnt; \ + len -= (count + 2); \ + if (len < 0) \ + break; \ + GETCHAR(citype, p); \ + GETCHAR(cilen, p); \ + if (cilen != (count + 2) || \ + citype != opt) \ + break; \ + for (indx = 0; indx < count; ++indx) {\ + GETCHAR(cichar, p); \ + if (cichar != ((u_char *) &val)[indx]) \ + break; \ + }\ + if (indx != count) \ + break; \ + neg = 0; \ + } + +#define REJCINODE(opt,neg,val) REJCICHARS(opt,neg,val,sizeof(val)) +#define REJCINAME(opt,neg,val) REJCICHARS(opt,neg,val,strlen(val)) + +#define REJCIVOID(opt, neg) \ + if (neg && p[0] == opt) { \ + if ((len -= CILEN_VOID) < 0) \ + break; \ + GETCHAR(citype, p); \ + GETCHAR(cilen, p); \ + if (cilen != CILEN_VOID || citype != opt) \ + break; \ + neg = 0; \ + } + +/* a reject for RIP/SAP is invalid since we don't send it and you can't + reject something which is not sent. (You can NAK, but you can't REJ.) */ +#define REJCIPROTO(opt, neg, val, bit) \ + if (neg && p[0] == opt) { \ + if ((len -= CILEN_PROTOCOL) < 0) \ + break; \ + GETCHAR(citype, p); \ + GETCHAR(cilen, p); \ + if (cilen != CILEN_PROTOCOL) \ + break; \ + GETSHORT(cishort, p); \ + if (cishort != to_external (val) || cishort == RIP_SAP) \ + break; \ + neg = 0; \ + } +/* + * Any Rejected CIs must be in exactly the same order that we sent. + * Check packet length and CI length at each step. + * If we find any deviations, then this packet is bad. + */ + try = *go; + + do { + REJCINETWORK (IPX_NETWORK_NUMBER, try.neg_nn, try.our_network); + REJCINODE (IPX_NODE_NUMBER, try.neg_node, try.our_node); + REJCINAME (IPX_ROUTER_NAME, try.neg_name, try.name); + REJCIPROTO (IPX_ROUTER_PROTOCOL, try.neg_router, try.router, 0); +/* + * This is the end of the record. + */ + if (len == 0) { + if (f->state != OPENED) + *go = try; + return (1); + } + } while (0); +/* + * The frame is invalid at this point. + */ + IPXCPDEBUG(("ipxcp_rejci: received bad Reject!")); + return 0; +} + +/* + * ipxcp_reqci - Check the peer's requested CIs and send appropriate response. + * + * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified + * appropriately. If reject_if_disagree is non-zero, doesn't return + * CONFNAK; returns CONFREJ if it can't return CONFACK. + */ +static int +ipxcp_reqci(f, inp, len, reject_if_disagree) + fsm *f; + u_char *inp; /* Requested CIs */ + int *len; /* Length of requested CIs */ + int reject_if_disagree; +{ + u_char *cip, *next; /* Pointer to current and next CIs */ + u_short cilen, citype; /* Parsed len, type */ + u_short cishort; /* Parsed short value */ + u_int32_t cinetwork; /* Parsed address values */ + int rc = CONFACK; /* Final packet return code */ + int orc; /* Individual option return code */ + u_char *p; /* Pointer to next char to parse */ + u_char *ucp = inp; /* Pointer to current output char */ + int l = *len; /* Length left */ + + /* + * Reset all his options. + */ + BZERO(ho, sizeof(*ho)); + + /* + * Process all his options. + */ + next = inp; + while (l) { + orc = CONFACK; /* Assume success */ + cip = p = next; /* Remember begining of CI */ + if (l < 2 || /* Not enough data for CI header or */ + p[1] < 2 || /* CI length too small or */ + p[1] > l) { /* CI length too big? */ + IPXCPDEBUG(("ipxcp_reqci: bad CI length!")); + orc = CONFREJ; /* Reject bad CI */ + cilen = l; /* Reject till end of packet */ + l = 0; /* Don't loop again */ + goto endswitch; + } + GETCHAR(citype, p); /* Parse CI type */ + GETCHAR(cilen, p); /* Parse CI length */ + l -= cilen; /* Adjust remaining length */ + next += cilen; /* Step to next CI */ + + switch (citype) { /* Check CI type */ +/* + * The network number must match. Choose the larger of the two. + */ + case IPX_NETWORK_NUMBER: + /* if we wont negotiate the network number or the length is wrong + then reject the option */ + if ( !ao->neg_nn || cilen != CILEN_NETN ) { + orc = CONFREJ; + break; + } + GETLONG(cinetwork, p); + + /* If the network numbers match then acknowledge them. */ + if (cinetwork != 0) { + ho->his_network = cinetwork; + ho->neg_nn = 1; + if (wo->our_network == cinetwork) + break; +/* + * If the network number is not given or we don't accept their change or + * the network number is too small then NAK it. + */ + if (! ao->accept_network || cinetwork < wo->our_network) { + DECPTR (sizeof (u_int32_t), p); + PUTLONG (wo->our_network, p); + orc = CONFNAK; + } + break; + } +/* + * The peer sent '0' for the network. Give it ours if we have one. + */ + if (go->our_network != 0) { + DECPTR (sizeof (u_int32_t), p); + PUTLONG (wo->our_network, p); + orc = CONFNAK; +/* + * We don't have one. Reject the value. + */ + } else + orc = CONFREJ; + + break; +/* + * The node number is required + */ + case IPX_NODE_NUMBER: + /* if we wont negotiate the node number or the length is wrong + then reject the option */ + if ( cilen != CILEN_NODEN ) { + orc = CONFREJ; + break; + } + + copy_node (p, ho->his_node); + ho->neg_node = 1; +/* + * If the remote does not have a number and we do then NAK it with the value + * which we have for it. (We never have a default value of zero.) + */ + if (zero_node (ho->his_node)) { + orc = CONFNAK; + copy_node (wo->his_node, p); + INCPTR (sizeof (wo->his_node), p); + break; + } +/* + * If you have given me the expected network node number then I'll accept + * it now. + */ + if (compare_node (wo->his_node, ho->his_node)) { + orc = CONFACK; + ho->neg_node = 1; + INCPTR (sizeof (wo->his_node), p); + break; + } +/* + * If his node number is the same as ours then ask him to try the next + * value. + */ + if (compare_node (ho->his_node, go->our_node)) { + inc_node (ho->his_node); + orc = CONFNAK; + copy_node (ho->his_node, p); + INCPTR (sizeof (wo->his_node), p); + break; + } +/* + * If we don't accept a new value then NAK it. + */ + if (! ao->accept_remote) { + copy_node (wo->his_node, p); + INCPTR (sizeof (wo->his_node), p); + orc = CONFNAK; + break; + } + orc = CONFACK; + ho->neg_node = 1; + INCPTR (sizeof (wo->his_node), p); + break; +/* + * Compression is not desired at this time. It is always rejected. + */ + case IPX_COMPRESSION_PROTOCOL: + orc = CONFREJ; + break; +/* + * The routing protocol is a bitmask of various types. Any combination + * of the values RIP_SAP and NLSP are permissible. 'IPX_NONE' for no + * routing protocol must be specified only once. + */ + case IPX_ROUTER_PROTOCOL: + if ( !ao->neg_router || cilen < CILEN_PROTOCOL ) { + orc = CONFREJ; + break; + } + + GETSHORT (cishort, p); + + if (wo->neg_router == 0) { + wo->neg_router = 1; + wo->router = BIT(IPX_NONE); + } + + if ((cishort == IPX_NONE && ho->router != 0) || + (ho->router & BIT(IPX_NONE))) { + orc = CONFREJ; + break; + } + + cishort = BIT(cishort); + if (ho->router & cishort) { + orc = CONFREJ; + break; + } + + ho->router |= cishort; + ho->neg_router = 1; + + /* Finally do not allow a router protocol which we do not + support. */ + + if ((cishort & (ao->router | BIT(IPX_NONE))) == 0) { + int protocol; + + if (cishort == BIT(NLSP) && + (ao->router & BIT(RIP_SAP)) && + !wo->tried_rip) { + protocol = RIP_SAP; + wo->tried_rip = 1; + } else + protocol = IPX_NONE; + + DECPTR (sizeof (u_int16_t), p); + PUTSHORT (protocol, p); + orc = CONFNAK; + } + break; +/* + * The router name is advisorary. Just accept it if it is not too large. + */ + case IPX_ROUTER_NAME: + if (cilen >= CILEN_NAME) { + int name_size = cilen - CILEN_NAME; + if (name_size > sizeof (ho->name)) + name_size = sizeof (ho->name) - 1; + memset (ho->name, 0, sizeof (ho->name)); + memcpy (ho->name, p, name_size); + ho->name [name_size] = '\0'; + ho->neg_name = 1; + orc = CONFACK; + break; + } + orc = CONFREJ; + break; +/* + * This is advisorary. + */ + case IPX_COMPLETE: + if (cilen != CILEN_COMPLETE) + orc = CONFREJ; + else { + ho->neg_complete = 1; + orc = CONFACK; + } + break; +/* + * All other entries are not known at this time. + */ + default: + orc = CONFREJ; + break; + } +endswitch: + if (orc == CONFACK && /* Good CI */ + rc != CONFACK) /* but prior CI wasnt? */ + continue; /* Don't send this one */ + + if (orc == CONFNAK) { /* Nak this CI? */ + if (reject_if_disagree) /* Getting fed up with sending NAKs? */ + orc = CONFREJ; /* Get tough if so */ + if (rc == CONFREJ) /* Rejecting prior CI? */ + continue; /* Don't send this one */ + if (rc == CONFACK) { /* Ack'd all prior CIs? */ + rc = CONFNAK; /* Not anymore... */ + ucp = inp; /* Backup */ + } + } + + if (orc == CONFREJ && /* Reject this CI */ + rc != CONFREJ) { /* but no prior ones? */ + rc = CONFREJ; + ucp = inp; /* Backup */ + } + + /* Need to move CI? */ + if (ucp != cip) + BCOPY(cip, ucp, cilen); /* Move it */ + + /* Update output pointer */ + INCPTR(cilen, ucp); + } + + /* + * If we aren't rejecting this packet, and we want to negotiate + * their address, and they didn't send their address, then we + * send a NAK with a IPX_NODE_NUMBER option appended. We assume the + * input buffer is long enough that we can append the extra + * option safely. + */ + + if (rc != CONFREJ && !ho->neg_node && + wo->req_nn && !reject_if_disagree) { + if (rc == CONFACK) { + rc = CONFNAK; + wo->req_nn = 0; /* don't ask again */ + ucp = inp; /* reset pointer */ + } + + if (zero_node (wo->his_node)) + inc_node (wo->his_node); + + PUTCHAR (IPX_NODE_NUMBER, ucp); + PUTCHAR (CILEN_NODEN, ucp); + copy_node (wo->his_node, ucp); + INCPTR (sizeof (wo->his_node), ucp); + } + + *len = ucp - inp; /* Compute output length */ + IPXCPDEBUG(("ipxcp: returning Configure-%s", CODENAME(rc))); + return (rc); /* Return final code */ +} + +/* + * ipxcp_up - IPXCP has come UP. + * + * Configure the IP network interface appropriately and bring it up. + */ + +static void +ipxcp_up(f) + fsm *f; +{ + int unit = f->unit; + + IPXCPDEBUG(("ipxcp: up")); + + /* The default router protocol is RIP/SAP. */ + if (ho->router == 0) + ho->router = BIT(RIP_SAP); + + if (go->router == 0) + go->router = BIT(RIP_SAP); + + /* Fetch the network number */ + if (!ho->neg_nn) + ho->his_network = wo->his_network; + + if (!ho->neg_node) + copy_node (wo->his_node, ho->his_node); + + if (!wo->neg_node && !go->neg_node) + copy_node (wo->our_node, go->our_node); + + if (zero_node (go->our_node)) { + static char errmsg[] = "Could not determine local IPX node address"; + if (debug) + error(errmsg); + ipxcp_close(f->unit, errmsg); + return; + } + + go->network = go->our_network; + if (ho->his_network != 0 && ho->his_network > go->network) + go->network = ho->his_network; + + if (go->network == 0) { + static char errmsg[] = "Can not determine network number"; + if (debug) + error(errmsg); + ipxcp_close (unit, errmsg); + return; + } + + /* bring the interface up */ + if (!sifup(unit)) { + if (debug) + warn("sifup failed (IPX)"); + ipxcp_close(unit, "Interface configuration failed"); + return; + } + ipxcp_is_up = 1; + + /* set the network number for IPX */ + if (!sipxfaddr(unit, go->network, go->our_node)) { + if (debug) + warn("sipxfaddr failed"); + ipxcp_close(unit, "Interface configuration failed"); + return; + } + + np_up(f->unit, PPP_IPX); + + /* + * Execute the ipx-up script, like this: + * /etc/ppp/ipx-up interface tty speed local-IPX remote-IPX + */ + + ipxcp_script (f, _PATH_IPXUP); +} + +/* + * ipxcp_down - IPXCP has gone DOWN. + * + * Take the IP network interface down, clear its addresses + * and delete routes through it. + */ + +static void +ipxcp_down(f) + fsm *f; +{ + IPXCPDEBUG(("ipxcp: down")); + + if (!ipxcp_is_up) + return; + ipxcp_is_up = 0; + np_down(f->unit, PPP_IPX); + cipxfaddr(f->unit); + sifnpmode(f->unit, PPP_IPX, NPMODE_DROP); + sifdown(f->unit); + ipxcp_script (f, _PATH_IPXDOWN); +} + + +/* + * ipxcp_finished - possibly shut down the lower layers. + */ +static void +ipxcp_finished(f) + fsm *f; +{ + np_finished(f->unit, PPP_IPX); +} + + +/* + * ipxcp_script - Execute a script with arguments + * interface-name tty-name speed local-IPX remote-IPX networks. + */ +static void +ipxcp_script(f, script) + fsm *f; + char *script; +{ + char strspeed[32], strlocal[32], strremote[32]; + char strnetwork[32], strpid[32]; + char *argv[14], strproto_lcl[32], strproto_rmt[32]; + + slprintf(strpid, sizeof(strpid), "%d", getpid()); + slprintf(strspeed, sizeof(strspeed),"%d", baud_rate); + + strproto_lcl[0] = '\0'; + if (go->neg_router && ((go->router & BIT(IPX_NONE)) == 0)) { + if (go->router & BIT(RIP_SAP)) + strlcpy (strproto_lcl, "RIP ", sizeof(strproto_lcl)); + if (go->router & BIT(NLSP)) + strlcat (strproto_lcl, "NLSP ", sizeof(strproto_lcl)); + } + + if (strproto_lcl[0] == '\0') + strlcpy (strproto_lcl, "NONE ", sizeof(strproto_lcl)); + + strproto_lcl[strlen (strproto_lcl)-1] = '\0'; + + strproto_rmt[0] = '\0'; + if (ho->neg_router && ((ho->router & BIT(IPX_NONE)) == 0)) { + if (ho->router & BIT(RIP_SAP)) + strlcpy (strproto_rmt, "RIP ", sizeof(strproto_rmt)); + if (ho->router & BIT(NLSP)) + strlcat (strproto_rmt, "NLSP ", sizeof(strproto_rmt)); + } + + if (strproto_rmt[0] == '\0') + strlcpy (strproto_rmt, "NONE ", sizeof(strproto_rmt)); + + strproto_rmt[strlen (strproto_rmt)-1] = '\0'; + + strlcpy (strnetwork, ipx_ntoa (go->network), sizeof(strnetwork)); + + slprintf (strlocal, sizeof(strlocal), "%0.6B", go->our_node); + + slprintf (strremote, sizeof(strremote), "%0.6B", ho->his_node); + + argv[0] = script; + argv[1] = ifname; + argv[2] = devnam; + argv[3] = strspeed; + argv[4] = strnetwork; + argv[5] = strlocal; + argv[6] = strremote; + argv[7] = strproto_lcl; + argv[8] = strproto_rmt; + argv[9] = go->name; + argv[10] = ho->name; + argv[11] = ipparam; + argv[12] = strpid; + argv[13] = NULL; + run_program(script, argv, 0, NULL, NULL); +} + +/* + * ipxcp_printpkt - print the contents of an IPXCP packet. + */ +static char *ipxcp_codenames[] = { + "ConfReq", "ConfAck", "ConfNak", "ConfRej", + "TermReq", "TermAck", "CodeRej" +}; + +static int +ipxcp_printpkt(p, plen, printer, arg) + u_char *p; + int plen; + void (*printer) __P((void *, char *, ...)); + void *arg; +{ + int code, id, len, olen; + u_char *pstart, *optend; + u_short cishort; + u_int32_t cilong; + + if (plen < HEADERLEN) + return 0; + pstart = p; + GETCHAR(code, p); + GETCHAR(id, p); + GETSHORT(len, p); + if (len < HEADERLEN || len > plen) + return 0; + + if (code >= 1 && code <= sizeof(ipxcp_codenames) / sizeof(char *)) + printer(arg, " %s", ipxcp_codenames[code-1]); + else + printer(arg, " code=0x%x", code); + printer(arg, " id=0x%x", id); + len -= HEADERLEN; + switch (code) { + case CONFREQ: + case CONFACK: + case CONFNAK: + case CONFREJ: + /* print option list */ + while (len >= 2) { + GETCHAR(code, p); + GETCHAR(olen, p); + p -= 2; + if (olen < CILEN_VOID || olen > len) { + break; + } + printer(arg, " <"); + len -= olen; + optend = p + olen; + switch (code) { + case IPX_NETWORK_NUMBER: + if (olen == CILEN_NETN) { + p += 2; + GETLONG(cilong, p); + printer (arg, "network %s", ipx_ntoa (cilong)); + } + break; + case IPX_NODE_NUMBER: + if (olen == CILEN_NODEN) { + p += 2; + printer (arg, "node "); + while (p < optend) { + GETCHAR(code, p); + printer(arg, "%.2x", (int) (unsigned int) (unsigned char) code); + } + } + break; + case IPX_COMPRESSION_PROTOCOL: + if (olen == CILEN_COMPRESS) { + p += 2; + GETSHORT (cishort, p); + printer (arg, "compression %d", (int) cishort); + } + break; + case IPX_ROUTER_PROTOCOL: + if (olen == CILEN_PROTOCOL) { + p += 2; + GETSHORT (cishort, p); + printer (arg, "router proto %d", (int) cishort); + } + break; + case IPX_ROUTER_NAME: + if (olen >= CILEN_NAME) { + p += 2; + printer (arg, "router name \""); + while (p < optend) { + GETCHAR(code, p); + if (code >= 0x20 && code <= 0x7E) + printer (arg, "%c", (int) (unsigned int) (unsigned char) code); + else + printer (arg, " \\%.2x", (int) (unsigned int) (unsigned char) code); + } + printer (arg, "\""); + } + break; + case IPX_COMPLETE: + if (olen == CILEN_COMPLETE) { + p += 2; + printer (arg, "complete"); + } + break; + default: + break; + } + + while (p < optend) { + GETCHAR(code, p); + printer(arg, " %.2x", (int) (unsigned int) (unsigned char) code); + } + printer(arg, ">"); + } + break; + + case TERMACK: + case TERMREQ: + if (len > 0 && *p >= ' ' && *p < 0x7f) { + printer(arg, " "); + print_string(p, len, printer, arg); + p += len; + len = 0; + } + break; + } + + /* print the rest of the bytes in the packet */ + for (; len > 0; --len) { + GETCHAR(code, p); + printer(arg, " %.2x", (int) (unsigned int) (unsigned char) code); + } + + return p - pstart; +} +#endif /* ifdef IPX_CHANGE */ |