X-Git-Url: http://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=pppd%2Fipcp.c;h=fee6757439d76df99299c58f2312c9be1059639a;hp=65662c981d29bbafbc905878675b2d80aa1ce8d7;hb=2dc6b270ecf72688083f03d80df67d0682e1e02c;hpb=4520eb29d86053eae4ecd77299fa13a7e99b6d7a diff --git a/pppd/ipcp.c b/pppd/ipcp.c index 65662c9..fee6757 100644 --- a/pppd/ipcp.c +++ b/pppd/ipcp.c @@ -18,7 +18,7 @@ */ #ifndef lint -static char rcsid[] = "$Id: ipcp.c,v 1.27 1996/07/01 05:32:17 paulus Exp $"; +static char rcsid[] = "$Id: ipcp.c,v 1.33 1998/03/25 03:08:47 paulus Exp $"; #endif /* @@ -33,9 +33,6 @@ static char rcsid[] = "$Id: ipcp.c,v 1.27 1996/07/01 05:32:17 paulus Exp $"; #include #include #include -#include -#include -#include #include "pppd.h" #include "fsm.h" @@ -122,6 +119,8 @@ struct protent ipcp_protent = { ip_active_pkt }; +static void ipcp_clear_addrs __P((int)); + /* * Lengths of configuration options. */ @@ -605,7 +604,7 @@ ipcp_nakci(f, p, len) no.neg_vj = 1; break; case CI_ADDRS: - if (go->neg_addr && go->old_addrs || no.old_addrs + if ((go->neg_addr && go->old_addrs) || no.old_addrs || cilen != CILEN_ADDRS) goto bad; try.neg_addr = 1; @@ -922,6 +921,27 @@ ipcp_reqci(f, inp, len, reject_if_disagree) orc = CONFNAK; } break; + + case CI_MS_WINS1: + case CI_MS_WINS2: + /* Microsoft primary or secondary WINS request */ + d = citype == CI_MS_WINS2; + IPCPDEBUG((LOG_INFO, "ipcp: received WINS%d Request ", d+1)); + + /* 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 (htonl(tl) != ao->winsaddr[d]) { + DECPTR(sizeof(u_int32_t), p); + tl = ntohl(ao->winsaddr[d]); + PUTLONG(tl, p); + orc = CONFNAK; + } + break; case CI_COMPRESSTYPE: IPCPDEBUG((LOG_INFO, "ipcp: received COMPRESSTYPE ")); @@ -1062,15 +1082,15 @@ ip_check_options() } if (demand && wo->hisaddr == 0) { - fprintf(stderr, "%s: remote IP address required for demand-dialling\n", - progname); + option_error("remote IP address required for demand-dialling\n"); exit(1); } +#if 0 if (demand && wo->accept_remote) { - fprintf(stderr, "%s: ipcp-accept-remote is incompatible with demand\n", - progname); + option_error("ipcp-accept-remote is incompatible with demand\n"); exit(1); } +#endif } @@ -1086,12 +1106,12 @@ ip_demand_conf(u) if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr))) return 0; - if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE)) - return 0; if (!sifup(u)) return 0; + if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE)) + return 0; if (wo->default_route) - if (sifdefaultroute(u, wo->hisaddr)) + if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr)) default_route_set[u] = 1; if (wo->proxy_arp) if (sifproxyarp(u, wo->hisaddr)) @@ -1137,6 +1157,8 @@ ipcp_up(f) ipcp_close(f->unit, "Could not determine local IP address"); return; } + script_setenv("IPLOCAL", ip_ntoa(go->ouraddr)); + script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr)); /* * Check that the peer is allowed to use the IP address it wants. @@ -1158,26 +1180,49 @@ ipcp_up(f) */ if (demand) { if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) { - syslog(LOG_ERR, "Failed to negotiate desired IP addresses"); - ipcp_close(f->unit, "Wrong IP addresses"); - return; + if (go->ouraddr != wo->ouraddr) + syslog(LOG_WARNING, "Local IP address changed to %s", + ip_ntoa(go->ouraddr)); + if (ho->hisaddr != wo->hisaddr) + syslog(LOG_WARNING, "Remote IP address changed to %s", + ip_ntoa(ho->hisaddr)); + ipcp_clear_addrs(f->unit); + + /* Set the interface to the new addresses */ + mask = GetMask(go->ouraddr); + if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) { + IPCPDEBUG((LOG_WARNING, "sifaddr failed")); + 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(f->unit, go->ouraddr, ho->hisaddr)) + default_route_set[f->unit] = 1; + + /* Make a proxy ARP entry if requested. */ + if (ipcp_wantoptions[f->unit].proxy_arp) + if (sifproxyarp(f->unit, ho->hisaddr)) + proxy_arp_set[f->unit] = 1; + } demand_rexmit(PPP_IP); sifnpmode(f->unit, PPP_IP, NPMODE_PASS); - } -#ifndef _linux_ /* Linux destroys routes when the device goes down. */ - else /* always use the code which adds the routes. */ -#endif - { + + } else { /* * Set IP addresses and (if specified) netmask. */ mask = GetMask(go->ouraddr); + +#if !(defined(SVR4) && (defined(SNI) || defined(__USLC__))) if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) { IPCPDEBUG((LOG_WARNING, "sifaddr failed")); ipcp_close(f->unit, "Interface configuration failed"); return; } +#endif /* bring the interface up for IP */ if (!sifup(f->unit)) { @@ -1185,11 +1230,19 @@ ipcp_up(f) ipcp_close(f->unit, "Interface configuration failed"); return; } + +#if (defined(SVR4) && (defined(SNI) || defined(__USLC__))) + if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) { + IPCPDEBUG((LOG_WARNING, "sifaddr failed")); + ipcp_close(f->unit, "Interface configuration failed"); + return; + } +#endif sifnpmode(f->unit, PPP_IP, NPMODE_PASS); /* assign a default route through the interface if required */ if (ipcp_wantoptions[f->unit].default_route) - if (sifdefaultroute(f->unit, ho->hisaddr)) + if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr)) default_route_set[f->unit] = 1; /* Make a proxy ARP entry if requested. */ @@ -1220,8 +1273,6 @@ static void ipcp_down(f) fsm *f; { - u_int32_t ouraddr, hisaddr; - IPCPDEBUG((LOG_INFO, "ipcp: down")); np_down(f->unit, PPP_IP); sifvjcomp(f->unit, 0, 0, 0); @@ -1232,20 +1283,9 @@ ipcp_down(f) */ if (demand) { sifnpmode(f->unit, PPP_IP, NPMODE_QUEUE); - } else { - ouraddr = ipcp_gotoptions[f->unit].ouraddr; - hisaddr = ipcp_hisoptions[f->unit].hisaddr; - if (proxy_arp_set[f->unit]) { - cifproxyarp(f->unit, hisaddr); - proxy_arp_set[f->unit] = 0; - } - if (default_route_set[f->unit]) { - cifdefaultroute(f->unit, hisaddr); - default_route_set[f->unit] = 0; - } sifdown(f->unit); - cifaddr(f->unit, ouraddr, hisaddr); + ipcp_clear_addrs(f->unit); } /* Execute the ip-down script */ @@ -1253,6 +1293,30 @@ ipcp_down(f) } +/* + * ipcp_clear_addrs() - clear the interface addresses, routes, + * proxy arp entries, etc. + */ +static void +ipcp_clear_addrs(unit) + int unit; +{ + u_int32_t ouraddr, hisaddr; + + ouraddr = ipcp_gotoptions[unit].ouraddr; + hisaddr = ipcp_hisoptions[unit].hisaddr; + if (proxy_arp_set[unit]) { + cifproxyarp(unit, hisaddr); + proxy_arp_set[unit] = 0; + } + if (default_route_set[unit]) { + cifdefaultroute(unit, ouraddr, hisaddr); + default_route_set[unit] = 0; + } + cifaddr(unit, ouraddr, hisaddr); +} + + /* * ipcp_finished - possibly shut down the lower layers. */ @@ -1376,6 +1440,18 @@ ipcp_printpkt(p, plen, printer, arg) printer(arg, "addr %s", ip_ntoa(htonl(cilong))); } break; + case CI_MS_DNS1: + case CI_MS_DNS2: + p += 2; + GETLONG(cilong, p); + printer(arg, "dns-addr %s", ip_ntoa(htonl(cilong))); + break; + case CI_MS_WINS1: + case CI_MS_WINS2: + p += 2; + GETLONG(cilong, p); + printer(arg, "wins-addr %s", ip_ntoa(htonl(cilong))); + break; } while (p < optend) { GETCHAR(code, p); @@ -1410,31 +1486,45 @@ ipcp_printpkt(p, plen, printer, arg) * We don't bring the link up for IP fragments or for TCP FIN packets * with no data. */ -#ifndef IP_OFFMASK +#define IP_HDRLEN 20 /* bytes */ #define IP_OFFMASK 0x1fff -#endif +#define IPPROTO_TCP 6 +#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; { - struct ip *ip; - struct tcphdr *tcp; + u_char *tcp; int hlen; - if (len < sizeof(struct ip) + PPP_HDRLEN) + len -= PPP_HDRLEN; + pkt += PPP_HDRLEN; + if (len < IP_HDRLEN) return 0; - ip = (struct ip *) (pkt + PPP_HDRLEN); - if ((ntohs(ip->ip_off) & IP_OFFMASK) != 0) + if ((get_ipoff(pkt) & IP_OFFMASK) != 0) return 0; - if (ip->ip_p != IPPROTO_TCP) + if (get_ipproto(pkt) != IPPROTO_TCP) return 1; - hlen = ip->ip_hl * 4; - if (len < hlen + sizeof(struct tcphdr) + PPP_HDRLEN) + hlen = get_iphl(pkt) * 4; + if (len < hlen + TCP_HDRLEN) return 0; - tcp = (struct tcphdr *) (pkt + PPP_HDRLEN + hlen); - if ((tcp->th_flags & TH_FIN) != 0 && hlen + tcp->th_off * 4 == len) + tcp = pkt + hlen; + if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4) return 0; return 1; }