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diff --git a/lwip/src/netif/ppp/ipcp.c b/lwip/src/netif/ppp/ipcp.c
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+/*
+ * ipcp.c - PPP IP Control Protocol.
+ *
+ * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
+ *
+ * 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. The name "Carnegie Mellon University" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For permission or any legal
+ * details, please contact
+ * Office of Technology Transfer
+ * Carnegie Mellon University
+ * 5000 Forbes Avenue
+ * Pittsburgh, PA 15213-3890
+ * (412) 268-4387, fax: (412) 268-7395
+ * tech-transfer@andrew.cmu.edu
+ *
+ * 4. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by Computing Services
+ * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
+ *
+ * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
+ * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
+ * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+ * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "netif/ppp/ppp_opts.h"
+#if PPP_SUPPORT && PPP_IPV4_SUPPORT /* don't build if not configured for use in lwipopts.h */
+
+/*
+ * @todo:
+ */
+
+#if 0 /* UNUSED */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <netdb.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#endif /* UNUSED */
+
+#include "netif/ppp/ppp_impl.h"
+
+#include "netif/ppp/fsm.h"
+#include "netif/ppp/ipcp.h"
+
+#if 0 /* UNUSED */
+/* global vars */
+u32_t netmask = 0; /* IP netmask to set on interface */
+#endif /* UNUSED */
+
+#if 0 /* UNUSED */
+bool disable_defaultip = 0; /* Don't use hostname for default IP adrs */
+#endif /* UNUSED */
+
+#if 0 /* moved to ppp_settings */
+bool noremoteip = 0; /* Let him have no IP address */
+#endif /* moved to ppp_setting */
+
+#if 0 /* UNUSED */
+/* Hook for a plugin to know when IP protocol has come up */
+void (*ip_up_hook) (void) = NULL;
+
+/* Hook for a plugin to know when IP protocol has come down */
+void (*ip_down_hook) (void) = NULL;
+
+/* Hook for a plugin to choose the remote IP address */
+void (*ip_choose_hook) (u32_t *) = NULL;
+#endif /* UNUSED */
+
+#if PPP_NOTIFY
+/* Notifiers for when IPCP goes up and down */
+struct notifier *ip_up_notifier = NULL;
+struct notifier *ip_down_notifier = NULL;
+#endif /* PPP_NOTIFY */
+
+/* local vars */
+#if 0 /* moved to ppp_pcb */
+static int default_route_set[NUM_PPP]; /* Have set up a default route */
+static int proxy_arp_set[NUM_PPP]; /* Have created proxy arp entry */
+static int ipcp_is_up; /* have called np_up() */
+static int ipcp_is_open; /* haven't called np_finished() */
+static bool ask_for_local; /* request our address from peer */
+#endif /* moved to ppp_pcb */
+#if 0 /* UNUSED */
+static char vj_value[8]; /* string form of vj option value */
+static char netmask_str[20]; /* string form of netmask value */
+#endif /* UNUSED */
+
+/*
+ * Callbacks for fsm code. (CI = Configuration Information)
+ */
+static void ipcp_resetci(fsm *f); /* Reset our CI */
+static int ipcp_cilen(fsm *f); /* Return length of our CI */
+static void ipcp_addci(fsm *f, u_char *ucp, int *lenp); /* Add our CI */
+static int ipcp_ackci(fsm *f, u_char *p, int len); /* Peer ack'd our CI */
+static int ipcp_nakci(fsm *f, u_char *p, int len, int treat_as_reject);/* Peer nak'd our CI */
+static int ipcp_rejci(fsm *f, u_char *p, int len); /* Peer rej'd our CI */
+static int ipcp_reqci(fsm *f, u_char *inp, int *len, int reject_if_disagree); /* Rcv CI */
+static void ipcp_up(fsm *f); /* We're UP */
+static void ipcp_down(fsm *f); /* We're DOWN */
+static void ipcp_finished(fsm *f); /* Don't need lower layer */
+
+static const fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */
+ ipcp_resetci, /* Reset our Configuration Information */
+ ipcp_cilen, /* Length of our Configuration Information */
+ ipcp_addci, /* Add our Configuration Information */
+ ipcp_ackci, /* ACK our Configuration Information */
+ ipcp_nakci, /* NAK our Configuration Information */
+ ipcp_rejci, /* Reject our Configuration Information */
+ ipcp_reqci, /* Request peer's Configuration Information */
+ ipcp_up, /* Called when fsm reaches OPENED state */
+ ipcp_down, /* Called when fsm leaves OPENED state */
+ NULL, /* Called when we want the lower layer up */
+ ipcp_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 */
+ "IPCP" /* String name of protocol */
+};
+
+/*
+ * Command-line options.
+ */
+#if PPP_OPTIONS
+static int setvjslots (char **);
+static int setdnsaddr (char **);
+static int setwinsaddr (char **);
+static int setnetmask (char **);
+int setipaddr (char *, char **, int);
+
+static void printipaddr (option_t *, void (*)(void *, char *,...),void *);
+
+static option_t ipcp_option_list[] = {
+ { "noip", o_bool, &ipcp_protent.enabled_flag,
+ "Disable IP and IPCP" },
+ { "-ip", o_bool, &ipcp_protent.enabled_flag,
+ "Disable IP and IPCP", OPT_ALIAS },
+
+ { "novj", o_bool, &ipcp_wantoptions[0].neg_vj,
+ "Disable VJ compression", OPT_A2CLR, &ipcp_allowoptions[0].neg_vj },
+ { "-vj", o_bool, &ipcp_wantoptions[0].neg_vj,
+ "Disable VJ compression", OPT_ALIAS | OPT_A2CLR,
+ &ipcp_allowoptions[0].neg_vj },
+
+ { "novjccomp", o_bool, &ipcp_wantoptions[0].cflag,
+ "Disable VJ connection-ID compression", OPT_A2CLR,
+ &ipcp_allowoptions[0].cflag },
+ { "-vjccomp", o_bool, &ipcp_wantoptions[0].cflag,
+ "Disable VJ connection-ID compression", OPT_ALIAS | OPT_A2CLR,
+ &ipcp_allowoptions[0].cflag },
+
+ { "vj-max-slots", o_special, (void *)setvjslots,
+ "Set maximum VJ header slots",
+ OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, vj_value },
+
+ { "ipcp-accept-local", o_bool, &ipcp_wantoptions[0].accept_local,
+ "Accept peer's address for us", 1 },
+ { "ipcp-accept-remote", o_bool, &ipcp_wantoptions[0].accept_remote,
+ "Accept peer's address for it", 1 },
+
+ { "ipparam", o_string, &ipparam,
+ "Set ip script parameter", OPT_PRIO },
+
+ { "noipdefault", o_bool, &disable_defaultip,
+ "Don't use name for default IP adrs", 1 },
+
+ { "ms-dns", 1, (void *)setdnsaddr,
+ "DNS address for the peer's use" },
+ { "ms-wins", 1, (void *)setwinsaddr,
+ "Nameserver for SMB over TCP/IP for peer" },
+
+ { "ipcp-restart", o_int, &ipcp_fsm[0].timeouttime,
+ "Set timeout for IPCP", OPT_PRIO },
+ { "ipcp-max-terminate", o_int, &ipcp_fsm[0].maxtermtransmits,
+ "Set max #xmits for term-reqs", OPT_PRIO },
+ { "ipcp-max-configure", o_int, &ipcp_fsm[0].maxconfreqtransmits,
+ "Set max #xmits for conf-reqs", OPT_PRIO },
+ { "ipcp-max-failure", o_int, &ipcp_fsm[0].maxnakloops,
+ "Set max #conf-naks for IPCP", OPT_PRIO },
+
+ { "defaultroute", o_bool, &ipcp_wantoptions[0].default_route,
+ "Add default route", OPT_ENABLE|1, &ipcp_allowoptions[0].default_route },
+ { "nodefaultroute", o_bool, &ipcp_allowoptions[0].default_route,
+ "disable defaultroute option", OPT_A2CLR,
+ &ipcp_wantoptions[0].default_route },
+ { "-defaultroute", o_bool, &ipcp_allowoptions[0].default_route,
+ "disable defaultroute option", OPT_ALIAS | OPT_A2CLR,
+ &ipcp_wantoptions[0].default_route },
+
+ { "replacedefaultroute", o_bool,
+ &ipcp_wantoptions[0].replace_default_route,
+ "Replace default route", 1
+ },
+ { "noreplacedefaultroute", o_bool,
+ &ipcp_allowoptions[0].replace_default_route,
+ "Never replace default route", OPT_A2COPY,
+ &ipcp_wantoptions[0].replace_default_route },
+ { "proxyarp", o_bool, &ipcp_wantoptions[0].proxy_arp,
+ "Add proxy ARP entry", OPT_ENABLE|1, &ipcp_allowoptions[0].proxy_arp },
+ { "noproxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
+ "disable proxyarp option", OPT_A2CLR,
+ &ipcp_wantoptions[0].proxy_arp },
+ { "-proxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
+ "disable proxyarp option", OPT_ALIAS | OPT_A2CLR,
+ &ipcp_wantoptions[0].proxy_arp },
+
+ { "usepeerdns", o_bool, &usepeerdns,
+ "Ask peer for DNS address(es)", 1 },
+
+ { "netmask", o_special, (void *)setnetmask,
+ "set netmask", OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, netmask_str },
+
+ { "ipcp-no-addresses", o_bool, &ipcp_wantoptions[0].old_addrs,
+ "Disable old-style IP-Addresses usage", OPT_A2CLR,
+ &ipcp_allowoptions[0].old_addrs },
+ { "ipcp-no-address", o_bool, &ipcp_wantoptions[0].neg_addr,
+ "Disable IP-Address usage", OPT_A2CLR,
+ &ipcp_allowoptions[0].neg_addr },
+
+ { "noremoteip", o_bool, &noremoteip,
+ "Allow peer to have no IP address", 1 },
+
+ { "nosendip", o_bool, &ipcp_wantoptions[0].neg_addr,
+ "Don't send our IP address to peer", OPT_A2CLR,
+ &ipcp_wantoptions[0].old_addrs},
+
+ { "IP addresses", o_wild, (void *) &setipaddr,
+ "set local and remote IP addresses",
+ OPT_NOARG | OPT_A2PRINTER, (void *) &printipaddr },
+
+ { NULL }
+};
+#endif /* PPP_OPTIONS */
+
+/*
+ * Protocol entry points from main code.
+ */
+static void ipcp_init(ppp_pcb *pcb);
+static void ipcp_open(ppp_pcb *pcb);
+static void ipcp_close(ppp_pcb *pcb, const char *reason);
+static void ipcp_lowerup(ppp_pcb *pcb);
+static void ipcp_lowerdown(ppp_pcb *pcb);
+static void ipcp_input(ppp_pcb *pcb, u_char *p, int len);
+static void ipcp_protrej(ppp_pcb *pcb);
+#if PRINTPKT_SUPPORT
+static int ipcp_printpkt(const u_char *p, int plen,
+ void (*printer) (void *, const char *, ...), void *arg);
+#endif /* PRINTPKT_SUPPORT */
+#if PPP_OPTIONS
+static void ip_check_options (void);
+#endif /* PPP_OPTIONS */
+#if DEMAND_SUPPORT
+static int ip_demand_conf (int);
+static int ip_active_pkt (u_char *, int);
+#endif /* DEMAND_SUPPORT */
+#if 0 /* UNUSED */
+static void create_resolv (u32_t, u32_t);
+#endif /* UNUSED */
+
+const struct protent ipcp_protent = {
+ PPP_IPCP,
+ ipcp_init,
+ ipcp_input,
+ ipcp_protrej,
+ ipcp_lowerup,
+ ipcp_lowerdown,
+ ipcp_open,
+ ipcp_close,
+#if PRINTPKT_SUPPORT
+ ipcp_printpkt,
+#endif /* PRINTPKT_SUPPORT */
+#if PPP_DATAINPUT
+ NULL,
+#endif /* PPP_DATAINPUT */
+#if PRINTPKT_SUPPORT
+ "IPCP",
+ "IP",
+#endif /* PRINTPKT_SUPPORT */
+#if PPP_OPTIONS
+ ipcp_option_list,
+ ip_check_options,
+#endif /* PPP_OPTIONS */
+#if DEMAND_SUPPORT
+ ip_demand_conf,
+ ip_active_pkt
+#endif /* DEMAND_SUPPORT */
+};
+
+static void ipcp_clear_addrs(ppp_pcb *pcb, u32_t ouraddr, u32_t hisaddr, u8_t replacedefaultroute);
+
+/*
+ * Lengths of configuration options.
+ */
+#define CILEN_VOID 2
+#define CILEN_COMPRESS 4 /* min length for compression protocol opt. */
+#define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */
+#define CILEN_ADDR 6 /* new-style single address option */
+#define CILEN_ADDRS 10 /* old-style dual address option */
+
+
+#define CODENAME(x) ((x) == CONFACK ? "ACK" : \
+ (x) == CONFNAK ? "NAK" : "REJ")
+
+#if 0 /* UNUSED, already defined by lwIP */
+/*
+ * Make a string representation of a network IP address.
+ */
+char *
+ip_ntoa(ipaddr)
+u32_t ipaddr;
+{
+ static char b[64];
+
+ slprintf(b, sizeof(b), "%I", ipaddr);
+ return b;
+}
+#endif /* UNUSED, already defined by lwIP */
+
+/*
+ * Option parsing.
+ */
+#if PPP_OPTIONS
+/*
+ * setvjslots - set maximum number of connection slots for VJ compression
+ */
+static int
+setvjslots(argv)
+ char **argv;
+{
+ int value;
+
+ if (!int_option(*argv, &value))
+ return 0;
+
+ if (value < 2 || value > 16) {
+ option_error("vj-max-slots value must be between 2 and 16");
+ return 0;
+ }
+ ipcp_wantoptions [0].maxslotindex =
+ ipcp_allowoptions[0].maxslotindex = value - 1;
+ slprintf(vj_value, sizeof(vj_value), "%d", value);
+ return 1;
+}
+
+/*
+ * setdnsaddr - set the dns address(es)
+ */
+static int
+setdnsaddr(argv)
+ char **argv;
+{
+ u32_t dns;
+ struct hostent *hp;
+
+ dns = inet_addr(*argv);
+ if (dns == (u32_t) -1) {
+ if ((hp = gethostbyname(*argv)) == NULL) {
+ option_error("invalid address parameter '%s' for ms-dns option",
+ *argv);
+ return 0;
+ }
+ dns = *(u32_t *)hp->h_addr;
+ }
+
+ /* We take the last 2 values given, the 2nd-last as the primary
+ and the last as the secondary. If only one is given it
+ becomes both primary and secondary. */
+ if (ipcp_allowoptions[0].dnsaddr[1] == 0)
+ ipcp_allowoptions[0].dnsaddr[0] = dns;
+ else
+ ipcp_allowoptions[0].dnsaddr[0] = ipcp_allowoptions[0].dnsaddr[1];
+
+ /* always set the secondary address value. */
+ ipcp_allowoptions[0].dnsaddr[1] = dns;
+
+ return (1);
+}
+
+/*
+ * setwinsaddr - set the wins address(es)
+ * This is primrarly used with the Samba package under UNIX or for pointing
+ * the caller to the existing WINS server on a Windows NT platform.
+ */
+static int
+setwinsaddr(argv)
+ char **argv;
+{
+ u32_t wins;
+ struct hostent *hp;
+
+ wins = inet_addr(*argv);
+ if (wins == (u32_t) -1) {
+ if ((hp = gethostbyname(*argv)) == NULL) {
+ option_error("invalid address parameter '%s' for ms-wins option",
+ *argv);
+ return 0;
+ }
+ wins = *(u32_t *)hp->h_addr;
+ }
+
+ /* We take the last 2 values given, the 2nd-last as the primary
+ and the last as the secondary. If only one is given it
+ becomes both primary and secondary. */
+ if (ipcp_allowoptions[0].winsaddr[1] == 0)
+ ipcp_allowoptions[0].winsaddr[0] = wins;
+ else
+ ipcp_allowoptions[0].winsaddr[0] = ipcp_allowoptions[0].winsaddr[1];
+
+ /* always set the secondary address value. */
+ ipcp_allowoptions[0].winsaddr[1] = wins;
+
+ return (1);
+}
+
+/*
+ * setipaddr - Set the IP address
+ * If doit is 0, the call is to check whether this option is
+ * potentially an IP address specification.
+ * Not static so that plugins can call it to set the addresses
+ */
+int
+setipaddr(arg, argv, doit)
+ char *arg;
+ char **argv;
+ int doit;
+{
+ struct hostent *hp;
+ char *colon;
+ u32_t local, remote;
+ ipcp_options *wo = &ipcp_wantoptions[0];
+ static int prio_local = 0, prio_remote = 0;
+
+ /*
+ * IP address pair separated by ":".
+ */
+ if ((colon = strchr(arg, ':')) == NULL)
+ return 0;
+ if (!doit)
+ return 1;
+
+ /*
+ * If colon first character, then no local addr.
+ */
+ if (colon != arg && option_priority >= prio_local) {
+ *colon = '\0';
+ if ((local = inet_addr(arg)) == (u32_t) -1) {
+ if ((hp = gethostbyname(arg)) == NULL) {
+ option_error("unknown host: %s", arg);
+ return 0;
+ }
+ local = *(u32_t *)hp->h_addr;
+ }
+ if (bad_ip_adrs(local)) {
+ option_error("bad local IP address %s", ip_ntoa(local));
+ return 0;
+ }
+ if (local != 0)
+ wo->ouraddr = local;
+ *colon = ':';
+ prio_local = option_priority;
+ }
+
+ /*
+ * If colon last character, then no remote addr.
+ */
+ if (*++colon != '\0' && option_priority >= prio_remote) {
+ if ((remote = inet_addr(colon)) == (u32_t) -1) {
+ if ((hp = gethostbyname(colon)) == NULL) {
+ option_error("unknown host: %s", colon);
+ return 0;
+ }
+ remote = *(u32_t *)hp->h_addr;
+ if (remote_name[0] == 0)
+ strlcpy(remote_name, colon, sizeof(remote_name));
+ }
+ if (bad_ip_adrs(remote)) {
+ option_error("bad remote IP address %s", ip_ntoa(remote));
+ return 0;
+ }
+ if (remote != 0)
+ wo->hisaddr = remote;
+ prio_remote = option_priority;
+ }
+
+ return 1;
+}
+
+static void
+printipaddr(opt, printer, arg)
+ option_t *opt;
+ void (*printer) (void *, char *, ...);
+ void *arg;
+{
+ ipcp_options *wo = &ipcp_wantoptions[0];
+
+ if (wo->ouraddr != 0)
+ printer(arg, "%I", wo->ouraddr);
+ printer(arg, ":");
+ if (wo->hisaddr != 0)
+ printer(arg, "%I", wo->hisaddr);
+}
+
+/*
+ * setnetmask - set the netmask to be used on the interface.
+ */
+static int
+setnetmask(argv)
+ char **argv;
+{
+ u32_t mask;
+ int n;
+ char *p;
+
+ /*
+ * Unfortunately, if we use inet_addr, we can't tell whether
+ * a result of all 1s is an error or a valid 255.255.255.255.
+ */
+ p = *argv;
+ n = parse_dotted_ip(p, &mask);
+
+ mask = lwip_htonl(mask);
+
+ if (n == 0 || p[n] != 0 || (netmask & ~mask) != 0) {
+ option_error("invalid netmask value '%s'", *argv);
+ return 0;
+ }
+
+ netmask = mask;
+ slprintf(netmask_str, sizeof(netmask_str), "%I", mask);
+
+ return (1);
+}
+
+int
+parse_dotted_ip(p, vp)
+ char *p;
+ u32_t *vp;
+{
+ int n;
+ u32_t v, b;
+ char *endp, *p0 = p;
+
+ v = 0;
+ for (n = 3;; --n) {
+ b = strtoul(p, &endp, 0);
+ if (endp == p)
+ return 0;
+ if (b > 255) {
+ if (n < 3)
+ return 0;
+ /* accept e.g. 0xffffff00 */
+ *vp = b;
+ return endp - p0;
+ }
+ v |= b << (n * 8);
+ p = endp;
+ if (n == 0)
+ break;
+ if (*p != '.')
+ return 0;
+ ++p;
+ }
+ *vp = v;
+ return p - p0;
+}
+#endif /* PPP_OPTIONS */
+
+/*
+ * ipcp_init - Initialize IPCP.
+ */
+static void ipcp_init(ppp_pcb *pcb) {
+ fsm *f = &pcb->ipcp_fsm;
+
+ ipcp_options *wo = &pcb->ipcp_wantoptions;
+ ipcp_options *ao = &pcb->ipcp_allowoptions;
+
+ f->pcb = pcb;
+ f->protocol = PPP_IPCP;
+ f->callbacks = &ipcp_callbacks;
+ fsm_init(f);
+
+ /*
+ * Some 3G modems use repeated IPCP NAKs as a way of stalling
+ * until they can contact a server on the network, so we increase
+ * the default number of NAKs we accept before we start treating
+ * them as rejects.
+ */
+ f->maxnakloops = 100;
+
+#if 0 /* Not necessary, everything is cleared in ppp_new() */
+ memset(wo, 0, sizeof(*wo));
+ memset(ao, 0, sizeof(*ao));
+#endif /* 0 */
+
+ wo->neg_addr = wo->old_addrs = 1;
+#if VJ_SUPPORT
+ wo->neg_vj = 1;
+ wo->vj_protocol = IPCP_VJ_COMP;
+ wo->maxslotindex = MAX_STATES - 1; /* really max index */
+ wo->cflag = 1;
+#endif /* VJ_SUPPORT */
+
+#if 0 /* UNUSED */
+ /* wanting default route by default */
+ wo->default_route = 1;
+#endif /* UNUSED */
+
+ ao->neg_addr = ao->old_addrs = 1;
+#if VJ_SUPPORT
+ /* max slots and slot-id compression are currently hardwired in */
+ /* ppp_if.c to 16 and 1, this needs to be changed (among other */
+ /* things) gmc */
+
+ ao->neg_vj = 1;
+ ao->maxslotindex = MAX_STATES - 1;
+ ao->cflag = 1;
+#endif /* #if VJ_SUPPORT */
+
+#if 0 /* UNUSED */
+ /*
+ * XXX These control whether the user may use the proxyarp
+ * and defaultroute options.
+ */
+ ao->proxy_arp = 1;
+ ao->default_route = 1;
+#endif /* UNUSED */
+}
+
+
+/*
+ * ipcp_open - IPCP is allowed to come up.
+ */
+static void ipcp_open(ppp_pcb *pcb) {
+ fsm *f = &pcb->ipcp_fsm;
+ fsm_open(f);
+ pcb->ipcp_is_open = 1;
+}
+
+
+/*
+ * ipcp_close - Take IPCP down.
+ */
+static void ipcp_close(ppp_pcb *pcb, const char *reason) {
+ fsm *f = &pcb->ipcp_fsm;
+ fsm_close(f, reason);
+}
+
+
+/*
+ * ipcp_lowerup - The lower layer is up.
+ */
+static void ipcp_lowerup(ppp_pcb *pcb) {
+ fsm *f = &pcb->ipcp_fsm;
+ fsm_lowerup(f);
+}
+
+
+/*
+ * ipcp_lowerdown - The lower layer is down.
+ */
+static void ipcp_lowerdown(ppp_pcb *pcb) {
+ fsm *f = &pcb->ipcp_fsm;
+ fsm_lowerdown(f);
+}
+
+
+/*
+ * ipcp_input - Input IPCP packet.
+ */
+static void ipcp_input(ppp_pcb *pcb, u_char *p, int len) {
+ fsm *f = &pcb->ipcp_fsm;
+ fsm_input(f, p, len);
+}
+
+
+/*
+ * ipcp_protrej - A Protocol-Reject was received for IPCP.
+ *
+ * Pretend the lower layer went down, so we shut up.
+ */
+static void ipcp_protrej(ppp_pcb *pcb) {
+ fsm *f = &pcb->ipcp_fsm;
+ fsm_lowerdown(f);
+}
+
+
+/*
+ * ipcp_resetci - Reset our CI.
+ * Called by fsm_sconfreq, Send Configure Request.
+ */
+static void ipcp_resetci(fsm *f) {
+ ppp_pcb *pcb = f->pcb;
+ ipcp_options *wo = &pcb->ipcp_wantoptions;
+ ipcp_options *go = &pcb->ipcp_gotoptions;
+ ipcp_options *ao = &pcb->ipcp_allowoptions;
+
+ wo->req_addr = (wo->neg_addr || wo->old_addrs) &&
+ (ao->neg_addr || ao->old_addrs);
+ if (wo->ouraddr == 0)
+ wo->accept_local = 1;
+ if (wo->hisaddr == 0)
+ wo->accept_remote = 1;
+#if LWIP_DNS
+ wo->req_dns1 = wo->req_dns2 = pcb->settings.usepeerdns; /* Request DNS addresses from the peer */
+#endif /* LWIP_DNS */
+ *go = *wo;
+ if (!pcb->ask_for_local)
+ go->ouraddr = 0;
+#if 0 /* UNUSED */
+ if (ip_choose_hook) {
+ ip_choose_hook(&wo->hisaddr);
+ if (wo->hisaddr) {
+ wo->accept_remote = 0;
+ }
+ }
+#endif /* UNUSED */
+ BZERO(&pcb->ipcp_hisoptions, sizeof(ipcp_options));
+}
+
+
+/*
+ * ipcp_cilen - Return length of our CI.
+ * Called by fsm_sconfreq, Send Configure Request.
+ */
+static int ipcp_cilen(fsm *f) {
+ ppp_pcb *pcb = f->pcb;
+ ipcp_options *go = &pcb->ipcp_gotoptions;
+#if VJ_SUPPORT
+ ipcp_options *wo = &pcb->ipcp_wantoptions;
+#endif /* VJ_SUPPORT */
+ ipcp_options *ho = &pcb->ipcp_hisoptions;
+
+#define LENCIADDRS(neg) (neg ? CILEN_ADDRS : 0)
+#if VJ_SUPPORT
+#define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
+#endif /* VJ_SUPPORT */
+#define LENCIADDR(neg) (neg ? CILEN_ADDR : 0)
+#if LWIP_DNS
+#define LENCIDNS(neg) LENCIADDR(neg)
+#endif /* LWIP_DNS */
+#if 0 /* UNUSED - WINS */
+#define LENCIWINS(neg) LENCIADDR(neg)
+#endif /* UNUSED - WINS */
+
+ /*
+ * First see if we want to change our options to the old
+ * forms because we have received old forms from the peer.
+ */
+ if (go->neg_addr && go->old_addrs && !ho->neg_addr && ho->old_addrs)
+ go->neg_addr = 0;
+
+#if VJ_SUPPORT
+ if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
+ /* try an older style of VJ negotiation */
+ /* use the old style only if the peer did */
+ if (ho->neg_vj && ho->old_vj) {
+ go->neg_vj = 1;
+ go->old_vj = 1;
+ go->vj_protocol = ho->vj_protocol;
+ }
+ }
+#endif /* VJ_SUPPORT */
+
+ return (LENCIADDRS(!go->neg_addr && go->old_addrs) +
+#if VJ_SUPPORT
+ LENCIVJ(go->neg_vj, go->old_vj) +
+#endif /* VJ_SUPPORT */
+ LENCIADDR(go->neg_addr) +
+#if LWIP_DNS
+ LENCIDNS(go->req_dns1) +
+ LENCIDNS(go->req_dns2) +
+#endif /* LWIP_DNS */
+#if 0 /* UNUSED - WINS */
+ LENCIWINS(go->winsaddr[0]) +
+ LENCIWINS(go->winsaddr[1]) +
+#endif /* UNUSED - WINS */
+ 0);
+}
+
+
+/*
+ * ipcp_addci - Add our desired CIs to a packet.
+ * Called by fsm_sconfreq, Send Configure Request.
+ */
+static void ipcp_addci(fsm *f, u_char *ucp, int *lenp) {
+ ppp_pcb *pcb = f->pcb;
+ ipcp_options *go = &pcb->ipcp_gotoptions;
+ int len = *lenp;
+
+#define ADDCIADDRS(opt, neg, val1, val2) \
+ if (neg) { \
+ if (len >= CILEN_ADDRS) { \
+ u32_t l; \
+ PUTCHAR(opt, ucp); \
+ PUTCHAR(CILEN_ADDRS, ucp); \
+ l = lwip_ntohl(val1); \
+ PUTLONG(l, ucp); \
+ l = lwip_ntohl(val2); \
+ PUTLONG(l, ucp); \
+ len -= CILEN_ADDRS; \
+ } else \
+ go->old_addrs = 0; \
+ }
+
+#if VJ_SUPPORT
+#define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \
+ if (neg) { \
+ int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
+ if (len >= vjlen) { \
+ PUTCHAR(opt, ucp); \
+ PUTCHAR(vjlen, ucp); \
+ PUTSHORT(val, ucp); \
+ if (!old) { \
+ PUTCHAR(maxslotindex, ucp); \
+ PUTCHAR(cflag, ucp); \
+ } \
+ len -= vjlen; \
+ } else \
+ neg = 0; \
+ }
+#endif /* VJ_SUPPORT */
+
+#define ADDCIADDR(opt, neg, val) \
+ if (neg) { \
+ if (len >= CILEN_ADDR) { \
+ u32_t l; \
+ PUTCHAR(opt, ucp); \
+ PUTCHAR(CILEN_ADDR, ucp); \
+ l = lwip_ntohl(val); \
+ PUTLONG(l, ucp); \
+ len -= CILEN_ADDR; \
+ } else \
+ neg = 0; \
+ }
+
+#if LWIP_DNS
+#define ADDCIDNS(opt, neg, addr) \
+ if (neg) { \
+ if (len >= CILEN_ADDR) { \
+ u32_t l; \
+ PUTCHAR(opt, ucp); \
+ PUTCHAR(CILEN_ADDR, ucp); \
+ l = lwip_ntohl(addr); \
+ PUTLONG(l, ucp); \
+ len -= CILEN_ADDR; \
+ } else \
+ neg = 0; \
+ }
+#endif /* LWIP_DNS */
+
+#if 0 /* UNUSED - WINS */
+#define ADDCIWINS(opt, addr) \
+ if (addr) { \
+ if (len >= CILEN_ADDR) { \
+ u32_t l; \
+ PUTCHAR(opt, ucp); \
+ PUTCHAR(CILEN_ADDR, ucp); \
+ l = lwip_ntohl(addr); \
+ PUTLONG(l, ucp); \
+ len -= CILEN_ADDR; \
+ } else \
+ addr = 0; \
+ }
+#endif /* UNUSED - WINS */
+
+ ADDCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr,
+ go->hisaddr);
+
+#if VJ_SUPPORT
+ ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
+ go->maxslotindex, go->cflag);
+#endif /* VJ_SUPPORT */
+
+ ADDCIADDR(CI_ADDR, go->neg_addr, go->ouraddr);
+
+#if LWIP_DNS
+ ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
+
+ ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
+#endif /* LWIP_DNS */
+
+#if 0 /* UNUSED - WINS */
+ ADDCIWINS(CI_MS_WINS1, go->winsaddr[0]);
+
+ ADDCIWINS(CI_MS_WINS2, go->winsaddr[1]);
+#endif /* UNUSED - WINS */
+
+ *lenp -= len;
+}
+
+
+/*
+ * ipcp_ackci - Ack our CIs.
+ * Called by fsm_rconfack, Receive Configure ACK.
+ *
+ * Returns:
+ * 0 - Ack was bad.
+ * 1 - Ack was good.
+ */
+static int ipcp_ackci(fsm *f, u_char *p, int len) {
+ ppp_pcb *pcb = f->pcb;
+ ipcp_options *go = &pcb->ipcp_gotoptions;
+ u_short cilen, citype;
+ u32_t cilong;
+#if VJ_SUPPORT
+ u_short cishort;
+ u_char cimaxslotindex, cicflag;
+#endif /* VJ_SUPPORT */
+
+ /*
+ * 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.
+ */
+
+#define ACKCIADDRS(opt, neg, val1, val2) \
+ if (neg) { \
+ u32_t l; \
+ if ((len -= CILEN_ADDRS) < 0) \
+ goto bad; \
+ GETCHAR(citype, p); \
+ GETCHAR(cilen, p); \
+ if (cilen != CILEN_ADDRS || \
+ citype != opt) \
+ goto bad; \
+ GETLONG(l, p); \
+ cilong = lwip_htonl(l); \
+ if (val1 != cilong) \
+ goto bad; \
+ GETLONG(l, p); \
+ cilong = lwip_htonl(l); \
+ if (val2 != cilong) \
+ goto bad; \
+ }
+
+#if VJ_SUPPORT
+#define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
+ if (neg) { \
+ int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
+ if ((len -= vjlen) < 0) \
+ goto bad; \
+ GETCHAR(citype, p); \
+ GETCHAR(cilen, p); \
+ if (cilen != vjlen || \
+ citype != opt) \
+ goto bad; \
+ GETSHORT(cishort, p); \
+ if (cishort != val) \
+ goto bad; \
+ if (!old) { \
+ GETCHAR(cimaxslotindex, p); \
+ if (cimaxslotindex != maxslotindex) \
+ goto bad; \
+ GETCHAR(cicflag, p); \
+ if (cicflag != cflag) \
+ goto bad; \
+ } \
+ }
+#endif /* VJ_SUPPORT */
+
+#define ACKCIADDR(opt, neg, val) \
+ if (neg) { \
+ u32_t l; \
+ if ((len -= CILEN_ADDR) < 0) \
+ goto bad; \
+ GETCHAR(citype, p); \
+ GETCHAR(cilen, p); \
+ if (cilen != CILEN_ADDR || \
+ citype != opt) \
+ goto bad; \
+ GETLONG(l, p); \
+ cilong = lwip_htonl(l); \
+ if (val != cilong) \
+ goto bad; \
+ }
+
+#if LWIP_DNS
+#define ACKCIDNS(opt, neg, addr) \
+ if (neg) { \
+ u32_t l; \
+ if ((len -= CILEN_ADDR) < 0) \
+ goto bad; \
+ GETCHAR(citype, p); \
+ GETCHAR(cilen, p); \
+ if (cilen != CILEN_ADDR || citype != opt) \
+ goto bad; \
+ GETLONG(l, p); \
+ cilong = lwip_htonl(l); \
+ if (addr != cilong) \
+ goto bad; \
+ }
+#endif /* LWIP_DNS */
+
+#if 0 /* UNUSED - WINS */
+#define ACKCIWINS(opt, addr) \
+ if (addr) { \
+ u32_t l; \
+ if ((len -= CILEN_ADDR) < 0) \
+ goto bad; \
+ GETCHAR(citype, p); \
+ GETCHAR(cilen, p); \
+ if (cilen != CILEN_ADDR || citype != opt) \
+ goto bad; \
+ GETLONG(l, p); \
+ cilong = lwip_htonl(l); \
+ if (addr != cilong) \
+ goto bad; \
+ }
+#endif /* UNUSED - WINS */
+
+ ACKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr,
+ go->hisaddr);
+
+#if VJ_SUPPORT
+ ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
+ go->maxslotindex, go->cflag);
+#endif /* VJ_SUPPORT */
+
+ ACKCIADDR(CI_ADDR, go->neg_addr, go->ouraddr);
+
+#if LWIP_DNS
+ ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
+
+ ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
+#endif /* LWIP_DNS */
+
+#if 0 /* UNUSED - WINS */
+ ACKCIWINS(CI_MS_WINS1, go->winsaddr[0]);
+
+ ACKCIWINS(CI_MS_WINS2, go->winsaddr[1]);
+#endif /* UNUSED - WINS */
+
+ /*
+ * If there are any remaining CIs, then this packet is bad.
+ */
+ if (len != 0)
+ goto bad;
+ return (1);
+
+bad:
+ IPCPDEBUG(("ipcp_ackci: received bad Ack!"));
+ return (0);
+}
+
+/*
+ * ipcp_nakci - Peer has sent a NAK for some of our CIs.
+ * This should not modify any state if the Nak is bad
+ * or if IPCP is in the OPENED state.
+ * Calback from fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject.
+ *
+ * Returns:
+ * 0 - Nak was bad.
+ * 1 - Nak was good.
+ */
+static int ipcp_nakci(fsm *f, u_char *p, int len, int treat_as_reject) {
+ ppp_pcb *pcb = f->pcb;
+ ipcp_options *go = &pcb->ipcp_gotoptions;
+ u_char citype, cilen, *next;
+#if VJ_SUPPORT
+ u_char cimaxslotindex, cicflag;
+ u_short cishort;
+#endif /* VJ_SUPPORT */
+ u32_t ciaddr1, ciaddr2, l;
+#if LWIP_DNS
+ u32_t cidnsaddr;
+#endif /* LWIP_DNS */
+ ipcp_options no; /* options we've seen Naks for */
+ ipcp_options try_; /* options to request next time */
+
+ BZERO(&no, sizeof(no));
+ try_ = *go;
+
+ /*
+ * Any Nak'd 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.
+ */
+#define NAKCIADDRS(opt, neg, code) \
+ if ((neg) && \
+ (cilen = p[1]) == CILEN_ADDRS && \
+ len >= cilen && \
+ p[0] == opt) { \
+ len -= cilen; \
+ INCPTR(2, p); \
+ GETLONG(l, p); \
+ ciaddr1 = lwip_htonl(l); \
+ GETLONG(l, p); \
+ ciaddr2 = lwip_htonl(l); \
+ no.old_addrs = 1; \
+ code \
+ }
+
+#if VJ_SUPPORT
+#define NAKCIVJ(opt, neg, code) \
+ if (go->neg && \
+ ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
+ len >= cilen && \
+ p[0] == opt) { \
+ len -= cilen; \
+ INCPTR(2, p); \
+ GETSHORT(cishort, p); \
+ no.neg = 1; \
+ code \
+ }
+#endif /* VJ_SUPPORT */
+
+#define NAKCIADDR(opt, neg, code) \
+ if (go->neg && \
+ (cilen = p[1]) == CILEN_ADDR && \
+ len >= cilen && \
+ p[0] == opt) { \
+ len -= cilen; \
+ INCPTR(2, p); \
+ GETLONG(l, p); \
+ ciaddr1 = lwip_htonl(l); \
+ no.neg = 1; \
+ code \
+ }
+
+#if LWIP_DNS
+#define NAKCIDNS(opt, neg, code) \
+ if (go->neg && \
+ ((cilen = p[1]) == CILEN_ADDR) && \
+ len >= cilen && \
+ p[0] == opt) { \
+ len -= cilen; \
+ INCPTR(2, p); \
+ GETLONG(l, p); \
+ cidnsaddr = lwip_htonl(l); \
+ no.neg = 1; \
+ code \
+ }
+#endif /* LWIP_DNS */
+
+ /*
+ * Accept the peer's idea of {our,his} address, if different
+ * from our idea, only if the accept_{local,remote} flag is set.
+ */
+ NAKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs,
+ if (treat_as_reject) {
+ try_.old_addrs = 0;
+ } else {
+ if (go->accept_local && ciaddr1) {
+ /* take his idea of our address */
+ try_.ouraddr = ciaddr1;
+ }
+ if (go->accept_remote && ciaddr2) {
+ /* take his idea of his address */
+ try_.hisaddr = ciaddr2;
+ }
+ }
+ );
+
+#if VJ_SUPPORT
+ /*
+ * Accept the peer's value of maxslotindex provided that it
+ * is less than what we asked for. Turn off slot-ID compression
+ * if the peer wants. Send old-style compress-type option if
+ * the peer wants.
+ */
+ NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
+ if (treat_as_reject) {
+ try_.neg_vj = 0;
+ } else if (cilen == CILEN_VJ) {
+ GETCHAR(cimaxslotindex, p);
+ GETCHAR(cicflag, p);
+ if (cishort == IPCP_VJ_COMP) {
+ try_.old_vj = 0;
+ if (cimaxslotindex < go->maxslotindex)
+ try_.maxslotindex = cimaxslotindex;
+ if (!cicflag)
+ try_.cflag = 0;
+ } else {
+ try_.neg_vj = 0;
+ }
+ } else {
+ if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
+ try_.old_vj = 1;
+ try_.vj_protocol = cishort;
+ } else {
+ try_.neg_vj = 0;
+ }
+ }
+ );
+#endif /* VJ_SUPPORT */
+
+ NAKCIADDR(CI_ADDR, neg_addr,
+ if (treat_as_reject) {
+ try_.neg_addr = 0;
+ try_.old_addrs = 0;
+ } else if (go->accept_local && ciaddr1) {
+ /* take his idea of our address */
+ try_.ouraddr = ciaddr1;
+ }
+ );
+
+#if LWIP_DNS
+ NAKCIDNS(CI_MS_DNS1, req_dns1,
+ if (treat_as_reject) {
+ try_.req_dns1 = 0;
+ } else {
+ try_.dnsaddr[0] = cidnsaddr;
+ }
+ );
+
+ NAKCIDNS(CI_MS_DNS2, req_dns2,
+ if (treat_as_reject) {
+ try_.req_dns2 = 0;
+ } else {
+ try_.dnsaddr[1] = cidnsaddr;
+ }
+ );
+#endif /* #if LWIP_DNS */
+
+ /*
+ * There may be remaining CIs, if the peer is requesting negotiation
+ * on an option that we didn't include in our request packet.
+ * If they want to negotiate about IP addresses, we comply.
+ * If they want us to ask for compression, we refuse.
+ * If they want us to ask for ms-dns, we do that, since some
+ * peers get huffy if we don't.
+ */
+ while (len >= CILEN_VOID) {
+ GETCHAR(citype, p);
+ GETCHAR(cilen, p);
+ if ( cilen < CILEN_VOID || (len -= cilen) < 0 )
+ goto bad;
+ next = p + cilen - 2;
+
+ switch (citype) {
+#if VJ_SUPPORT
+ case CI_COMPRESSTYPE:
+ if (go->neg_vj || no.neg_vj ||
+ (cilen != CILEN_VJ && cilen != CILEN_COMPRESS))
+ goto bad;
+ no.neg_vj = 1;
+ break;
+#endif /* VJ_SUPPORT */
+ case CI_ADDRS:
+ if ((!go->neg_addr && go->old_addrs) || no.old_addrs
+ || cilen != CILEN_ADDRS)
+ goto bad;
+ try_.neg_addr = 0;
+ GETLONG(l, p);
+ ciaddr1 = lwip_htonl(l);
+ if (ciaddr1 && go->accept_local)
+ try_.ouraddr = ciaddr1;
+ GETLONG(l, p);
+ ciaddr2 = lwip_htonl(l);
+ if (ciaddr2 && go->accept_remote)
+ try_.hisaddr = ciaddr2;
+ no.old_addrs = 1;
+ break;
+ case CI_ADDR:
+ if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR)
+ goto bad;
+ try_.old_addrs = 0;
+ GETLONG(l, p);
+ ciaddr1 = lwip_htonl(l);
+ if (ciaddr1 && go->accept_local)
+ try_.ouraddr = ciaddr1;
+ if (try_.ouraddr != 0)
+ try_.neg_addr = 1;
+ no.neg_addr = 1;
+ break;
+#if LWIP_DNS
+ case CI_MS_DNS1:
+ if (go->req_dns1 || no.req_dns1 || cilen != CILEN_ADDR)
+ goto bad;
+ GETLONG(l, p);
+ try_.dnsaddr[0] = lwip_htonl(l);
+ try_.req_dns1 = 1;
+ no.req_dns1 = 1;
+ break;
+ case CI_MS_DNS2:
+ if (go->req_dns2 || no.req_dns2 || cilen != CILEN_ADDR)
+ goto bad;
+ GETLONG(l, p);
+ try_.dnsaddr[1] = lwip_htonl(l);
+ try_.req_dns2 = 1;
+ no.req_dns2 = 1;
+ break;
+#endif /* LWIP_DNS */
+#if 0 /* UNUSED - WINS */
+ case CI_MS_WINS1:
+ case CI_MS_WINS2:
+ if (cilen != CILEN_ADDR)
+ goto bad;
+ GETLONG(l, p);
+ ciaddr1 = lwip_htonl(l);
+ if (ciaddr1)
+ try_.winsaddr[citype == CI_MS_WINS2] = ciaddr1;
+ break;
+#endif /* UNUSED - WINS */
+ default:
+ break;
+ }
+ p = next;
+ }
+
+ /*
+ * OK, the Nak is good. Now we can update state.
+ * If there are any remaining options, we ignore them.
+ */
+ if (f->state != PPP_FSM_OPENED)
+ *go = try_;
+
+ return 1;
+
+bad:
+ IPCPDEBUG(("ipcp_nakci: received bad Nak!"));
+ return 0;
+}
+
+
+/*
+ * ipcp_rejci - Reject some of our CIs.
+ * Callback from fsm_rconfnakrej.
+ */
+static int ipcp_rejci(fsm *f, u_char *p, int len) {
+ ppp_pcb *pcb = f->pcb;
+ ipcp_options *go = &pcb->ipcp_gotoptions;
+ u_char cilen;
+#if VJ_SUPPORT
+ u_char cimaxslotindex, ciflag;
+ u_short cishort;
+#endif /* VJ_SUPPORT */
+ u32_t cilong;
+ ipcp_options try_; /* options to request next time */
+
+ try_ = *go;
+ /*
+ * 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.
+ */
+#define REJCIADDRS(opt, neg, val1, val2) \
+ if ((neg) && \
+ (cilen = p[1]) == CILEN_ADDRS && \
+ len >= cilen && \
+ p[0] == opt) { \
+ u32_t l; \
+ len -= cilen; \
+ INCPTR(2, p); \
+ GETLONG(l, p); \
+ cilong = lwip_htonl(l); \
+ /* Check rejected value. */ \
+ if (cilong != val1) \
+ goto bad; \
+ GETLONG(l, p); \
+ cilong = lwip_htonl(l); \
+ /* Check rejected value. */ \
+ if (cilong != val2) \
+ goto bad; \
+ try_.old_addrs = 0; \
+ }
+
+#if VJ_SUPPORT
+#define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
+ if (go->neg && \
+ p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
+ len >= p[1] && \
+ p[0] == opt) { \
+ len -= p[1]; \
+ INCPTR(2, p); \
+ GETSHORT(cishort, p); \
+ /* Check rejected value. */ \
+ if (cishort != val) \
+ goto bad; \
+ if (!old) { \
+ GETCHAR(cimaxslotindex, p); \
+ if (cimaxslotindex != maxslot) \
+ goto bad; \
+ GETCHAR(ciflag, p); \
+ if (ciflag != cflag) \
+ goto bad; \
+ } \
+ try_.neg = 0; \
+ }
+#endif /* VJ_SUPPORT */
+
+#define REJCIADDR(opt, neg, val) \
+ if (go->neg && \
+ (cilen = p[1]) == CILEN_ADDR && \
+ len >= cilen && \
+ p[0] == opt) { \
+ u32_t l; \
+ len -= cilen; \
+ INCPTR(2, p); \
+ GETLONG(l, p); \
+ cilong = lwip_htonl(l); \
+ /* Check rejected value. */ \
+ if (cilong != val) \
+ goto bad; \
+ try_.neg = 0; \
+ }
+
+#if LWIP_DNS
+#define REJCIDNS(opt, neg, dnsaddr) \
+ if (go->neg && \
+ ((cilen = p[1]) == CILEN_ADDR) && \
+ len >= cilen && \
+ p[0] == opt) { \
+ u32_t l; \
+ len -= cilen; \
+ INCPTR(2, p); \
+ GETLONG(l, p); \
+ cilong = lwip_htonl(l); \
+ /* Check rejected value. */ \
+ if (cilong != dnsaddr) \
+ goto bad; \
+ try_.neg = 0; \
+ }
+#endif /* LWIP_DNS */
+
+#if 0 /* UNUSED - WINS */
+#define REJCIWINS(opt, addr) \
+ if (addr && \
+ ((cilen = p[1]) == CILEN_ADDR) && \
+ len >= cilen && \
+ p[0] == opt) { \
+ u32_t l; \
+ len -= cilen; \
+ INCPTR(2, p); \
+ GETLONG(l, p); \
+ cilong = lwip_htonl(l); \
+ /* Check rejected value. */ \
+ if (cilong != addr) \
+ goto bad; \
+ try_.winsaddr[opt == CI_MS_WINS2] = 0; \
+ }
+#endif /* UNUSED - WINS */
+
+ REJCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs,
+ go->ouraddr, go->hisaddr);
+
+#if VJ_SUPPORT
+ REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
+ go->maxslotindex, go->cflag);
+#endif /* VJ_SUPPORT */
+
+ REJCIADDR(CI_ADDR, neg_addr, go->ouraddr);
+
+#if LWIP_DNS
+ REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]);
+
+ REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]);
+#endif /* LWIP_DNS */
+
+#if 0 /* UNUSED - WINS */
+ REJCIWINS(CI_MS_WINS1, go->winsaddr[0]);
+
+ REJCIWINS(CI_MS_WINS2, go->winsaddr[1]);
+#endif /* UNUSED - WINS */
+
+ /*
+ * If there are any remaining CIs, then this packet is bad.
+ */
+ if (len != 0)
+ goto bad;
+ /*
+ * Now we can update state.
+ */
+ if (f->state != PPP_FSM_OPENED)
+ *go = try_;
+ return 1;
+
+bad:
+ IPCPDEBUG(("ipcp_rejci: received bad Reject!"));
+ return 0;
+}
+
+
+/*
+ * ipcp_reqci - Check the peer's requested CIs and send appropriate response.
+ * Callback from fsm_rconfreq, Receive Configure Request
+ *
+ * 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.
+ *
+ * inp = Requested CIs
+ * len = Length of requested CIs
+ */
+static int ipcp_reqci(fsm *f, u_char *inp, int *len, int reject_if_disagree) {
+ ppp_pcb *pcb = f->pcb;
+ ipcp_options *wo = &pcb->ipcp_wantoptions;
+ ipcp_options *ho = &pcb->ipcp_hisoptions;
+ ipcp_options *ao = &pcb->ipcp_allowoptions;
+ u_char *cip, *next; /* Pointer to current and next CIs */
+ u_short cilen, citype; /* Parsed len, type */
+#if VJ_SUPPORT
+ u_short cishort; /* Parsed short value */
+#endif /* VJ_SUPPORT */
+ u32_t tl, ciaddr1, ciaddr2;/* 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 */
+#if VJ_SUPPORT
+ u_char maxslotindex, cflag;
+#endif /* VJ_SUPPORT */
+#if LWIP_DNS
+ int d;
+#endif /* LWIP_DNS */
+
+ /*
+ * 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? */
+ IPCPDEBUG(("ipcp_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 */
+ case CI_ADDRS:
+ if (!ao->old_addrs || ho->neg_addr ||
+ cilen != CILEN_ADDRS) { /* Check CI length */
+ orc = CONFREJ; /* Reject CI */
+ break;
+ }
+
+ /*
+ * If he has no address, or if we both have his address but
+ * disagree about it, then NAK it with our idea.
+ * In particular, if we don't know his address, but he does,
+ * then accept it.
+ */
+ GETLONG(tl, p); /* Parse source address (his) */
+ ciaddr1 = lwip_htonl(tl);
+ if (ciaddr1 != wo->hisaddr
+ && (ciaddr1 == 0 || !wo->accept_remote)) {
+ orc = CONFNAK;
+ if (!reject_if_disagree) {
+ DECPTR(sizeof(u32_t), p);
+ tl = lwip_ntohl(wo->hisaddr);
+ PUTLONG(tl, p);
+ }
+ } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
+ /*
+ * If neither we nor he knows his address, reject the option.
+ */
+ orc = CONFREJ;
+ wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
+ break;
+ }
+
+ /*
+ * If he doesn't know our address, or if we both have our address
+ * but disagree about it, then NAK it with our idea.
+ */
+ GETLONG(tl, p); /* Parse desination address (ours) */
+ ciaddr2 = lwip_htonl(tl);
+ if (ciaddr2 != wo->ouraddr) {
+ if (ciaddr2 == 0 || !wo->accept_local) {
+ orc = CONFNAK;
+ if (!reject_if_disagree) {
+ DECPTR(sizeof(u32_t), p);
+ tl = lwip_ntohl(wo->ouraddr);
+ PUTLONG(tl, p);
+ }
+ } else {
+ wo->ouraddr = ciaddr2; /* accept peer's idea */
+ }
+ }
+
+ ho->old_addrs = 1;
+ ho->hisaddr = ciaddr1;
+ ho->ouraddr = ciaddr2;
+ break;
+
+ case CI_ADDR:
+ if (!ao->neg_addr || ho->old_addrs ||
+ cilen != CILEN_ADDR) { /* Check CI length */
+ orc = CONFREJ; /* Reject CI */
+ break;
+ }
+
+ /*
+ * If he has no address, or if we both have his address but
+ * disagree about it, then NAK it with our idea.
+ * In particular, if we don't know his address, but he does,
+ * then accept it.
+ */
+ GETLONG(tl, p); /* Parse source address (his) */
+ ciaddr1 = lwip_htonl(tl);
+ if (ciaddr1 != wo->hisaddr
+ && (ciaddr1 == 0 || !wo->accept_remote)) {
+ orc = CONFNAK;
+ if (!reject_if_disagree) {
+ DECPTR(sizeof(u32_t), p);
+ tl = lwip_ntohl(wo->hisaddr);
+ PUTLONG(tl, p);
+ }
+ } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
+ /*
+ * Don't ACK an address of 0.0.0.0 - reject it instead.
+ */
+ orc = CONFREJ;
+ wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
+ break;
+ }
+
+ ho->neg_addr = 1;
+ ho->hisaddr = ciaddr1;
+ break;
+
+#if LWIP_DNS
+ case CI_MS_DNS1:
+ case CI_MS_DNS2:
+ /* Microsoft primary or secondary DNS request */
+ d = citype == CI_MS_DNS2;
+
+ /* If we do not have a DNS address then we cannot send it */
+ if (ao->dnsaddr[d] == 0 ||
+ cilen != CILEN_ADDR) { /* Check CI length */
+ orc = CONFREJ; /* Reject CI */
+ break;
+ }
+ GETLONG(tl, p);
+ if (lwip_htonl(tl) != ao->dnsaddr[d]) {
+ DECPTR(sizeof(u32_t), p);
+ tl = lwip_ntohl(ao->dnsaddr[d]);
+ PUTLONG(tl, p);
+ orc = CONFNAK;
+ }
+ break;
+#endif /* LWIP_DNS */
+
+#if 0 /* UNUSED - WINS */
+ case CI_MS_WINS1:
+ case CI_MS_WINS2:
+ /* Microsoft primary or secondary WINS request */
+ d = citype == CI_MS_WINS2;
+
+ /* If we do not have a DNS address then we cannot send it */
+ if (ao->winsaddr[d] == 0 ||
+ cilen != CILEN_ADDR) { /* Check CI length */
+ orc = CONFREJ; /* Reject CI */
+ break;
+ }
+ GETLONG(tl, p);
+ if (lwip_htonl(tl) != ao->winsaddr[d]) {
+ DECPTR(sizeof(u32_t), p);
+ tl = lwip_ntohl(ao->winsaddr[d]);
+ PUTLONG(tl, p);
+ orc = CONFNAK;
+ }
+ break;
+#endif /* UNUSED - WINS */
+
+#if VJ_SUPPORT
+ case CI_COMPRESSTYPE:
+ if (!ao->neg_vj ||
+ (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
+ orc = CONFREJ;
+ break;
+ }
+ GETSHORT(cishort, p);
+
+ if (!(cishort == IPCP_VJ_COMP ||
+ (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
+ orc = CONFREJ;
+ break;
+ }
+
+ ho->neg_vj = 1;
+ ho->vj_protocol = cishort;
+ if (cilen == CILEN_VJ) {
+ GETCHAR(maxslotindex, p);
+ if (maxslotindex > ao->maxslotindex) {
+ orc = CONFNAK;
+ if (!reject_if_disagree){
+ DECPTR(1, p);
+ PUTCHAR(ao->maxslotindex, p);
+ }
+ }
+ GETCHAR(cflag, p);
+ if (cflag && !ao->cflag) {
+ orc = CONFNAK;
+ if (!reject_if_disagree){
+ DECPTR(1, p);
+ PUTCHAR(wo->cflag, p);
+ }
+ }
+ ho->maxslotindex = maxslotindex;
+ ho->cflag = cflag;
+ } else {
+ ho->old_vj = 1;
+ ho->maxslotindex = MAX_STATES - 1;
+ ho->cflag = 1;
+ }
+ break;
+#endif /* VJ_SUPPORT */
+
+ 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 */
+ else {
+ 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)
+ MEMCPY(ucp, cip, 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 CI_ADDR option appended. We assume the
+ * input buffer is long enough that we can append the extra
+ * option safely.
+ */
+ if (rc != CONFREJ && !ho->neg_addr && !ho->old_addrs &&
+ wo->req_addr && !reject_if_disagree && !pcb->settings.noremoteip) {
+ if (rc == CONFACK) {
+ rc = CONFNAK;
+ ucp = inp; /* reset pointer */
+ wo->req_addr = 0; /* don't ask again */
+ }
+ PUTCHAR(CI_ADDR, ucp);
+ PUTCHAR(CILEN_ADDR, ucp);
+ tl = lwip_ntohl(wo->hisaddr);
+ PUTLONG(tl, ucp);
+ }
+
+ *len = ucp - inp; /* Compute output length */
+ IPCPDEBUG(("ipcp: returning Configure-%s", CODENAME(rc)));
+ return (rc); /* Return final code */
+}
+
+
+#if 0 /* UNUSED */
+/*
+ * ip_check_options - check that any IP-related options are OK,
+ * and assign appropriate defaults.
+ */
+static void
+ip_check_options()
+{
+ struct hostent *hp;
+ u32_t local;
+ ipcp_options *wo = &ipcp_wantoptions[0];
+
+ /*
+ * Default our local IP address based on our hostname.
+ * If local IP address already given, don't bother.
+ */
+ if (wo->ouraddr == 0 && !disable_defaultip) {
+ /*
+ * Look up our hostname (possibly with domain name appended)
+ * and take the first IP address as our local IP address.
+ * If there isn't an IP address for our hostname, too bad.
+ */
+ wo->accept_local = 1; /* don't insist on this default value */
+ if ((hp = gethostbyname(hostname)) != NULL) {
+ local = *(u32_t *)hp->h_addr;
+ if (local != 0 && !bad_ip_adrs(local))
+ wo->ouraddr = local;
+ }
+ }
+ ask_for_local = wo->ouraddr != 0 || !disable_defaultip;
+}
+#endif /* UNUSED */
+
+#if DEMAND_SUPPORT
+/*
+ * ip_demand_conf - configure the interface as though
+ * IPCP were up, for use with dial-on-demand.
+ */
+static int
+ip_demand_conf(u)
+ int u;
+{
+ ppp_pcb *pcb = &ppp_pcb_list[u];
+ ipcp_options *wo = &ipcp_wantoptions[u];
+
+ if (wo->hisaddr == 0 && !pcb->settings.noremoteip) {
+ /* make up an arbitrary address for the peer */
+ wo->hisaddr = lwip_htonl(0x0a707070 + ifunit);
+ wo->accept_remote = 1;
+ }
+ if (wo->ouraddr == 0) {
+ /* make up an arbitrary address for us */
+ wo->ouraddr = lwip_htonl(0x0a404040 + ifunit);
+ wo->accept_local = 1;
+ ask_for_local = 0; /* don't tell the peer this address */
+ }
+ if (!sifaddr(pcb, wo->ouraddr, wo->hisaddr, get_mask(wo->ouraddr)))
+ return 0;
+ if (!sifup(pcb))
+ return 0;
+ if (!sifnpmode(pcb, PPP_IP, NPMODE_QUEUE))
+ return 0;
+#if 0 /* UNUSED */
+ if (wo->default_route)
+ if (sifdefaultroute(pcb, wo->ouraddr, wo->hisaddr,
+ wo->replace_default_route))
+ default_route_set[u] = 1;
+#endif /* UNUSED */
+#if 0 /* UNUSED - PROXY ARP */
+ if (wo->proxy_arp)
+ if (sifproxyarp(pcb, wo->hisaddr))
+ proxy_arp_set[u] = 1;
+#endif /* UNUSED - PROXY ARP */
+
+ ppp_notice("local IP address %I", wo->ouraddr);
+ if (wo->hisaddr)
+ ppp_notice("remote IP address %I", wo->hisaddr);
+
+ return 1;
+}
+#endif /* DEMAND_SUPPORT */
+
+/*
+ * ipcp_up - IPCP has come UP.
+ *
+ * Configure the IP network interface appropriately and bring it up.
+ */
+static void ipcp_up(fsm *f) {
+ ppp_pcb *pcb = f->pcb;
+ u32_t mask;
+ ipcp_options *ho = &pcb->ipcp_hisoptions;
+ ipcp_options *go = &pcb->ipcp_gotoptions;
+ ipcp_options *wo = &pcb->ipcp_wantoptions;
+
+ IPCPDEBUG(("ipcp: up"));
+
+ /*
+ * We must have a non-zero IP address for both ends of the link.
+ */
+ if (!ho->neg_addr && !ho->old_addrs)
+ ho->hisaddr = wo->hisaddr;
+
+ if (!(go->neg_addr || go->old_addrs) && (wo->neg_addr || wo->old_addrs)
+ && wo->ouraddr != 0) {
+ ppp_error("Peer refused to agree to our IP address");
+ ipcp_close(f->pcb, "Refused our IP address");
+ return;
+ }
+ if (go->ouraddr == 0) {
+ ppp_error("Could not determine local IP address");
+ ipcp_close(f->pcb, "Could not determine local IP address");
+ return;
+ }
+ if (ho->hisaddr == 0 && !pcb->settings.noremoteip) {
+ ho->hisaddr = lwip_htonl(0x0a404040);
+ ppp_warn("Could not determine remote IP address: defaulting to %I",
+ ho->hisaddr);
+ }
+#if 0 /* UNUSED */
+ script_setenv("IPLOCAL", ip_ntoa(go->ouraddr), 0);
+ if (ho->hisaddr != 0)
+ script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr), 1);
+#endif /* UNUSED */
+
+#if LWIP_DNS
+ if (!go->req_dns1)
+ go->dnsaddr[0] = 0;
+ if (!go->req_dns2)
+ go->dnsaddr[1] = 0;
+#if 0 /* UNUSED */
+ if (go->dnsaddr[0])
+ script_setenv("DNS1", ip_ntoa(go->dnsaddr[0]), 0);
+ if (go->dnsaddr[1])
+ script_setenv("DNS2", ip_ntoa(go->dnsaddr[1]), 0);
+#endif /* UNUSED */
+ if (pcb->settings.usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) {
+ sdns(pcb, go->dnsaddr[0], go->dnsaddr[1]);
+#if 0 /* UNUSED */
+ script_setenv("USEPEERDNS", "1", 0);
+ create_resolv(go->dnsaddr[0], go->dnsaddr[1]);
+#endif /* UNUSED */
+ }
+#endif /* LWIP_DNS */
+
+ /*
+ * Check that the peer is allowed to use the IP address it wants.
+ */
+ if (ho->hisaddr != 0) {
+ u32_t addr = lwip_ntohl(ho->hisaddr);
+ if ((addr >> IP_CLASSA_NSHIFT) == IP_LOOPBACKNET
+ || IP_MULTICAST(addr) || IP_BADCLASS(addr)
+ /*
+ * For now, consider that PPP in server mode with peer required
+ * to authenticate must provide the peer IP address, reject any
+ * IP address wanted by peer different than the one we wanted.
+ */
+#if PPP_SERVER && PPP_AUTH_SUPPORT
+ || (pcb->settings.auth_required && wo->hisaddr != ho->hisaddr)
+#endif /* PPP_SERVER && PPP_AUTH_SUPPORT */
+ ) {
+ ppp_error("Peer is not authorized to use remote address %I", ho->hisaddr);
+ ipcp_close(pcb, "Unauthorized remote IP address");
+ return;
+ }
+ }
+#if 0 /* Unused */
+ /* Upstream checking code */
+ if (ho->hisaddr != 0 && !auth_ip_addr(f->unit, ho->hisaddr)) {
+ ppp_error("Peer is not authorized to use remote address %I", ho->hisaddr);
+ ipcp_close(f->unit, "Unauthorized remote IP address");
+ return;
+ }
+#endif /* Unused */
+
+#if VJ_SUPPORT
+ /* set tcp compression */
+ sifvjcomp(pcb, ho->neg_vj, ho->cflag, ho->maxslotindex);
+#endif /* VJ_SUPPORT */
+
+#if DEMAND_SUPPORT
+ /*
+ * If we are doing dial-on-demand, the interface is already
+ * configured, so we put out any saved-up packets, then set the
+ * interface to pass IP packets.
+ */
+ if (demand) {
+ if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) {
+ ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr,
+ wo->replace_default_route);
+ if (go->ouraddr != wo->ouraddr) {
+ ppp_warn("Local IP address changed to %I", go->ouraddr);
+ script_setenv("OLDIPLOCAL", ip_ntoa(wo->ouraddr), 0);
+ wo->ouraddr = go->ouraddr;
+ } else
+ script_unsetenv("OLDIPLOCAL");
+ if (ho->hisaddr != wo->hisaddr && wo->hisaddr != 0) {
+ ppp_warn("Remote IP address changed to %I", ho->hisaddr);
+ script_setenv("OLDIPREMOTE", ip_ntoa(wo->hisaddr), 0);
+ wo->hisaddr = ho->hisaddr;
+ } else
+ script_unsetenv("OLDIPREMOTE");
+
+ /* Set the interface to the new addresses */
+ mask = get_mask(go->ouraddr);
+ if (!sifaddr(pcb, go->ouraddr, ho->hisaddr, mask)) {
+#if PPP_DEBUG
+ ppp_warn("Interface configuration failed");
+#endif /* PPP_DEBUG */
+ ipcp_close(f->unit, "Interface configuration failed");
+ return;
+ }
+
+ /* assign a default route through the interface if required */
+ if (ipcp_wantoptions[f->unit].default_route)
+ if (sifdefaultroute(pcb, go->ouraddr, ho->hisaddr,
+ wo->replace_default_route))
+ default_route_set[f->unit] = 1;
+
+#if 0 /* UNUSED - PROXY ARP */
+ /* Make a proxy ARP entry if requested. */
+ if (ho->hisaddr != 0 && ipcp_wantoptions[f->unit].proxy_arp)
+ if (sifproxyarp(pcb, ho->hisaddr))
+ proxy_arp_set[f->unit] = 1;
+#endif /* UNUSED - PROXY ARP */
+
+ }
+ demand_rexmit(PPP_IP,go->ouraddr);
+ sifnpmode(pcb, PPP_IP, NPMODE_PASS);
+
+ } else
+#endif /* DEMAND_SUPPORT */
+ {
+ /*
+ * Set IP addresses and (if specified) netmask.
+ */
+ mask = get_mask(go->ouraddr);
+
+#if !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
+ if (!sifaddr(pcb, go->ouraddr, ho->hisaddr, mask)) {
+#if PPP_DEBUG
+ ppp_warn("Interface configuration failed");
+#endif /* PPP_DEBUG */
+ ipcp_close(f->pcb, "Interface configuration failed");
+ return;
+ }
+#endif
+
+ /* bring the interface up for IP */
+ if (!sifup(pcb)) {
+#if PPP_DEBUG
+ ppp_warn("Interface failed to come up");
+#endif /* PPP_DEBUG */
+ ipcp_close(f->pcb, "Interface configuration failed");
+ return;
+ }
+
+#if (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
+ if (!sifaddr(pcb, go->ouraddr, ho->hisaddr, mask)) {
+#if PPP_DEBUG
+ ppp_warn("Interface configuration failed");
+#endif /* PPP_DEBUG */
+ ipcp_close(f->unit, "Interface configuration failed");
+ return;
+ }
+#endif
+#if DEMAND_SUPPORT
+ sifnpmode(pcb, PPP_IP, NPMODE_PASS);
+#endif /* DEMAND_SUPPORT */
+
+#if 0 /* UNUSED */
+ /* assign a default route through the interface if required */
+ if (wo->default_route)
+ if (sifdefaultroute(pcb, go->ouraddr, ho->hisaddr,
+ wo->replace_default_route))
+ pcb->default_route_set = 1;
+#endif /* UNUSED */
+
+#if 0 /* UNUSED - PROXY ARP */
+ /* Make a proxy ARP entry if requested. */
+ if (ho->hisaddr != 0 && wo->proxy_arp)
+ if (sifproxyarp(pcb, ho->hisaddr))
+ pcb->proxy_arp_set = 1;
+#endif /* UNUSED - PROXY ARP */
+
+ wo->ouraddr = go->ouraddr;
+
+ ppp_notice("local IP address %I", go->ouraddr);
+ if (ho->hisaddr != 0)
+ ppp_notice("remote IP address %I", ho->hisaddr);
+#if LWIP_DNS
+ if (go->dnsaddr[0])
+ ppp_notice("primary DNS address %I", go->dnsaddr[0]);
+ if (go->dnsaddr[1])
+ ppp_notice("secondary DNS address %I", go->dnsaddr[1]);
+#endif /* LWIP_DNS */
+ }
+
+#if PPP_STATS_SUPPORT
+ reset_link_stats(f->unit);
+#endif /* PPP_STATS_SUPPORT */
+
+ np_up(pcb, PPP_IP);
+ pcb->ipcp_is_up = 1;
+
+#if PPP_NOTIFY
+ notify(ip_up_notifier, 0);
+#endif /* PPP_NOTIFY */
+#if 0 /* UNUSED */
+ if (ip_up_hook)
+ ip_up_hook();
+#endif /* UNUSED */
+}
+
+
+/*
+ * ipcp_down - IPCP has gone DOWN.
+ *
+ * Take the IP network interface down, clear its addresses
+ * and delete routes through it.
+ */
+static void ipcp_down(fsm *f) {
+ ppp_pcb *pcb = f->pcb;
+ ipcp_options *ho = &pcb->ipcp_hisoptions;
+ ipcp_options *go = &pcb->ipcp_gotoptions;
+
+ IPCPDEBUG(("ipcp: down"));
+#if PPP_STATS_SUPPORT
+ /* XXX a bit IPv4-centric here, we only need to get the stats
+ * before the interface is marked down. */
+ /* XXX more correct: we must get the stats before running the notifiers,
+ * at least for the radius plugin */
+ update_link_stats(f->unit);
+#endif /* PPP_STATS_SUPPORT */
+#if PPP_NOTIFY
+ notify(ip_down_notifier, 0);
+#endif /* PPP_NOTIFY */
+#if 0 /* UNUSED */
+ if (ip_down_hook)
+ ip_down_hook();
+#endif /* UNUSED */
+ if (pcb->ipcp_is_up) {
+ pcb->ipcp_is_up = 0;
+ np_down(pcb, PPP_IP);
+ }
+#if VJ_SUPPORT
+ sifvjcomp(pcb, 0, 0, 0);
+#endif /* VJ_SUPPORT */
+
+#if PPP_STATS_SUPPORT
+ print_link_stats(); /* _after_ running the notifiers and ip_down_hook(),
+ * because print_link_stats() sets link_stats_valid
+ * to 0 (zero) */
+#endif /* PPP_STATS_SUPPORT */
+
+#if DEMAND_SUPPORT
+ /*
+ * If we are doing dial-on-demand, set the interface
+ * to queue up outgoing packets (for now).
+ */
+ if (demand) {
+ sifnpmode(pcb, PPP_IP, NPMODE_QUEUE);
+ } else
+#endif /* DEMAND_SUPPORT */
+ {
+#if DEMAND_SUPPORT
+ sifnpmode(pcb, PPP_IP, NPMODE_DROP);
+#endif /* DEMAND_SUPPORT */
+ sifdown(pcb);
+ ipcp_clear_addrs(pcb, go->ouraddr,
+ ho->hisaddr, 0);
+#if LWIP_DNS
+ cdns(pcb, go->dnsaddr[0], go->dnsaddr[1]);
+#endif /* LWIP_DNS */
+ }
+}
+
+
+/*
+ * ipcp_clear_addrs() - clear the interface addresses, routes,
+ * proxy arp entries, etc.
+ */
+static void ipcp_clear_addrs(ppp_pcb *pcb, u32_t ouraddr, u32_t hisaddr, u8_t replacedefaultroute) {
+ LWIP_UNUSED_ARG(replacedefaultroute);
+
+#if 0 /* UNUSED - PROXY ARP */
+ if (pcb->proxy_arp_set) {
+ cifproxyarp(pcb, hisaddr);
+ pcb->proxy_arp_set = 0;
+ }
+#endif /* UNUSED - PROXY ARP */
+#if 0 /* UNUSED */
+ /* If replacedefaultroute, sifdefaultroute will be called soon
+ * with replacedefaultroute set and that will overwrite the current
+ * default route. This is the case only when doing demand, otherwise
+ * during demand, this cifdefaultroute would restore the old default
+ * route which is not what we want in this case. In the non-demand
+ * case, we'll delete the default route and restore the old if there
+ * is one saved by an sifdefaultroute with replacedefaultroute.
+ */
+ if (!replacedefaultroute && pcb->default_route_set) {
+ cifdefaultroute(pcb, ouraddr, hisaddr);
+ pcb->default_route_set = 0;
+ }
+#endif /* UNUSED */
+ cifaddr(pcb, ouraddr, hisaddr);
+}
+
+
+/*
+ * ipcp_finished - possibly shut down the lower layers.
+ */
+static void ipcp_finished(fsm *f) {
+ ppp_pcb *pcb = f->pcb;
+ if (pcb->ipcp_is_open) {
+ pcb->ipcp_is_open = 0;
+ np_finished(pcb, PPP_IP);
+ }
+}
+
+
+#if 0 /* UNUSED */
+/*
+ * create_resolv - create the replacement resolv.conf file
+ */
+static void
+create_resolv(peerdns1, peerdns2)
+ u32_t peerdns1, peerdns2;
+{
+
+}
+#endif /* UNUSED */
+
+#if PRINTPKT_SUPPORT
+/*
+ * ipcp_printpkt - print the contents of an IPCP packet.
+ */
+static const char* const ipcp_codenames[] = {
+ "ConfReq", "ConfAck", "ConfNak", "ConfRej",
+ "TermReq", "TermAck", "CodeRej"
+};
+
+static int ipcp_printpkt(const u_char *p, int plen,
+ void (*printer) (void *, const char *, ...), void *arg) {
+ int code, id, len, olen;
+ const u_char *pstart, *optend;
+#if VJ_SUPPORT
+ u_short cishort;
+#endif /* VJ_SUPPORT */
+ u32_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 <= (int)LWIP_ARRAYSIZE(ipcp_codenames))
+ printer(arg, " %s", ipcp_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 < 2 || olen > len) {
+ break;
+ }
+ printer(arg, " <");
+ len -= olen;
+ optend = p + olen;
+ switch (code) {
+ case CI_ADDRS:
+ if (olen == CILEN_ADDRS) {
+ p += 2;
+ GETLONG(cilong, p);
+ printer(arg, "addrs %I", lwip_htonl(cilong));
+ GETLONG(cilong, p);
+ printer(arg, " %I", lwip_htonl(cilong));
+ }
+ break;
+#if VJ_SUPPORT
+ case CI_COMPRESSTYPE:
+ if (olen >= CILEN_COMPRESS) {
+ p += 2;
+ GETSHORT(cishort, p);
+ printer(arg, "compress ");
+ switch (cishort) {
+ case IPCP_VJ_COMP:
+ printer(arg, "VJ");
+ break;
+ case IPCP_VJ_COMP_OLD:
+ printer(arg, "old-VJ");
+ break;
+ default:
+ printer(arg, "0x%x", cishort);
+ }
+ }
+ break;
+#endif /* VJ_SUPPORT */
+ case CI_ADDR:
+ if (olen == CILEN_ADDR) {
+ p += 2;
+ GETLONG(cilong, p);
+ printer(arg, "addr %I", lwip_htonl(cilong));
+ }
+ break;
+#if LWIP_DNS
+ case CI_MS_DNS1:
+ case CI_MS_DNS2:
+ p += 2;
+ GETLONG(cilong, p);
+ printer(arg, "ms-dns%d %I", (code == CI_MS_DNS1? 1: 2),
+ htonl(cilong));
+ break;
+#endif /* LWIP_DNS */
+#if 0 /* UNUSED - WINS */
+ case CI_MS_WINS1:
+ case CI_MS_WINS2:
+ p += 2;
+ GETLONG(cilong, p);
+ printer(arg, "ms-wins %I", lwip_htonl(cilong));
+ break;
+#endif /* UNUSED - WINS */
+ default:
+ break;
+ }
+ while (p < optend) {
+ GETCHAR(code, p);
+ printer(arg, " %.2x", code);
+ }
+ printer(arg, ">");
+ }
+ break;
+
+ case TERMACK:
+ case TERMREQ:
+ if (len > 0 && *p >= ' ' && *p < 0x7f) {
+ printer(arg, " ");
+ ppp_print_string(p, len, printer, arg);
+ p += len;
+ len = 0;
+ }
+ break;
+ default:
+ break;
+ }
+
+ /* print the rest of the bytes in the packet */
+ for (; len > 0; --len) {
+ GETCHAR(code, p);
+ printer(arg, " %.2x", code);
+ }
+
+ return p - pstart;
+}
+#endif /* PRINTPKT_SUPPORT */
+
+#if DEMAND_SUPPORT
+/*
+ * ip_active_pkt - see if this IP packet is worth bringing the link up for.
+ * We don't bring the link up for IP fragments or for TCP FIN packets
+ * with no data.
+ */
+#define IP_HDRLEN 20 /* bytes */
+#define IP_OFFMASK 0x1fff
+#ifndef IPPROTO_TCP
+#define IPPROTO_TCP 6
+#endif
+#define TCP_HDRLEN 20
+#define TH_FIN 0x01
+
+/*
+ * We use these macros because the IP header may be at an odd address,
+ * and some compilers might use word loads to get th_off or ip_hl.
+ */
+
+#define net_short(x) (((x)[0] << 8) + (x)[1])
+#define get_iphl(x) (((unsigned char *)(x))[0] & 0xF)
+#define get_ipoff(x) net_short((unsigned char *)(x) + 6)
+#define get_ipproto(x) (((unsigned char *)(x))[9])
+#define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
+#define get_tcpflags(x) (((unsigned char *)(x))[13])
+
+static int
+ip_active_pkt(pkt, len)
+ u_char *pkt;
+ int len;
+{
+ u_char *tcp;
+ int hlen;
+
+ len -= PPP_HDRLEN;
+ pkt += PPP_HDRLEN;
+ if (len < IP_HDRLEN)
+ return 0;
+ if ((get_ipoff(pkt) & IP_OFFMASK) != 0)
+ return 0;
+ if (get_ipproto(pkt) != IPPROTO_TCP)
+ return 1;
+ hlen = get_iphl(pkt) * 4;
+ if (len < hlen + TCP_HDRLEN)
+ return 0;
+ tcp = pkt + hlen;
+ if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4)
+ return 0;
+ return 1;
+}
+#endif /* DEMAND_SUPPORT */
+
+#endif /* PPP_SUPPORT && PPP_IPV4_SUPPORT */
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-02 23:43:58 +0000