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ppp.12038
ppp-2.4.2-cifdefroute.diff
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File ppp-2.4.2-cifdefroute.diff of Package ppp.12038
--- pppd/ipcp.c +++ pppd/ipcp.c @@ -197,6 +197,16 @@ "disable defaultroute option", OPT_ALIAS | OPT_A2CLR, &ipcp_wantoptions[0].default_route }, +#ifdef __linux__ + { "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 }, +#endif { "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, @@ -263,7 +273,7 @@ ip_active_pkt }; -static void ipcp_clear_addrs __P((int, u_int32_t, u_int32_t)); +static void ipcp_clear_addrs __P((int, u_int32_t, u_int32_t, bool)); static void ipcp_script __P((char *, int)); /* Run an up/down script */ static void ipcp_script_done __P((void *)); @@ -1660,7 +1670,12 @@ if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE)) return 0; if (wo->default_route) +#ifndef __linux__ if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr)) +#else + if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr, + wo->replace_default_route)) +#endif default_route_set[u] = 1; if (wo->proxy_arp) if (sifproxyarp(u, wo->hisaddr)) @@ -1742,7 +1757,8 @@ */ if (demand) { if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) { - ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr); + ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr, + wo->replace_default_route); if (go->ouraddr != wo->ouraddr) { warn("Local IP address changed to %I", go->ouraddr); script_setenv("OLDIPLOCAL", ip_ntoa(wo->ouraddr), 0); @@ -1767,7 +1783,12 @@ /* assign a default route through the interface if required */ if (ipcp_wantoptions[f->unit].default_route) +#ifndef __linux__ if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr)) +#else + if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr, + wo->replace_default_route)) +#endif default_route_set[f->unit] = 1; /* Make a proxy ARP entry if requested. */ @@ -1817,7 +1838,12 @@ /* assign a default route through the interface if required */ if (ipcp_wantoptions[f->unit].default_route) +#ifndef __linux__ if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr)) +#else + if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr, + wo->replace_default_route)) +#endif default_route_set[f->unit] = 1; /* Make a proxy ARP entry if requested. */ @@ -1894,7 +1920,7 @@ sifnpmode(f->unit, PPP_IP, NPMODE_DROP); sifdown(f->unit); ipcp_clear_addrs(f->unit, ipcp_gotoptions[f->unit].ouraddr, - ipcp_hisoptions[f->unit].hisaddr); + ipcp_hisoptions[f->unit].hisaddr, 0); } /* Execute the ip-down script */ @@ -1910,16 +1936,25 @@ * proxy arp entries, etc. */ static void -ipcp_clear_addrs(unit, ouraddr, hisaddr) +ipcp_clear_addrs(unit, ouraddr, hisaddr, replacedefaultroute) int unit; u_int32_t ouraddr; /* local address */ u_int32_t hisaddr; /* remote address */ + bool replacedefaultroute; { if (proxy_arp_set[unit]) { cifproxyarp(unit, hisaddr); proxy_arp_set[unit] = 0; } - if (default_route_set[unit]) { + /* 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 && default_route_set[unit]) { cifdefaultroute(unit, ouraddr, hisaddr); default_route_set[unit] = 0; } --- pppd/ipcp.h +++ pppd/ipcp.h @@ -70,6 +70,7 @@ bool old_addrs; /* Use old (IP-Addresses) option? */ bool req_addr; /* Ask peer to send IP address? */ bool default_route; /* Assign default route through interface? */ + bool replace_default_route; /* Replace default route through interface? */ bool proxy_arp; /* Make proxy ARP entry for peer? */ bool neg_vj; /* Van Jacobson Compression? */ bool old_vj; /* use old (short) form of VJ option? */ --- pppd/pppd.8 +++ pppd/pppd.8 @@ -121,6 +121,13 @@ This entry is removed when the PPP connection is broken. This option is privileged if the \fInodefaultroute\fR option has been specified. .TP +.B replacedefaultroute +This option is a flag to the defaultroute option. If defaultroute is +set and this flag is also set, pppd replaces an existing default route +with the new default route. + + +.TP .B disconnect \fIscript Execute the command specified by \fIscript\fR, by passing it to a shell, after @@ -706,7 +713,12 @@ .TP .B nodefaultroute Disable the \fIdefaultroute\fR option. The system administrator who -wishes to prevent users from creating default routes with pppd +wishes to prevent users from adding a default route with pppd +can do so by placing this option in the /etc/ppp/options file. +.TP +.B noreplacedefaultroute +Disable the \fIreplacedefaultroute\fR option. The system administrator who +wishes to prevent users from replacing a default route with pppd can do so by placing this option in the /etc/ppp/options file. .TP .B nodeflate --- pppd/pppd.h +++ pppd/pppd.h @@ -642,7 +642,11 @@ int cif6addr __P((int, eui64_t, eui64_t)); /* Remove an IPv6 address from i/f */ #endif +#ifndef __linux__ int sifdefaultroute __P((int, u_int32_t, u_int32_t)); +#else +int sifdefaultroute __P((int, u_int32_t, u_int32_t, bool replace_default_rt)); +#endif /* Create default route through i/f */ int cifdefaultroute __P((int, u_int32_t, u_int32_t)); /* Delete default route through i/f */ --- pppd/sys-linux.c +++ pppd/sys-linux.c @@ -206,6 +206,8 @@ static int if_is_up; /* Interface has been marked up */ static int if6_is_up; /* Interface has been marked up for IPv6, to help differentiate */ static int have_default_route; /* Gateway for default route added */ +static struct rtentry old_def_rt; /* Old default route */ +static int default_rt_repl_rest; /* replace and restore old default rt */ static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */ static char proxy_arp_dev[16]; /* Device for proxy arp entry */ static u_int32_t our_old_addr; /* for detecting address changes */ @@ -1513,6 +1515,9 @@ p = NULL; } + SET_SA_FAMILY (rt->rt_dst, AF_INET); + SET_SA_FAMILY (rt->rt_gateway, AF_INET); + SIN_ADDR(rt->rt_dst) = strtoul(cols[route_dest_col], NULL, 16); SIN_ADDR(rt->rt_gateway) = strtoul(cols[route_gw_col], NULL, 16); SIN_ADDR(rt->rt_genmask) = strtoul(cols[route_mask_col], NULL, 16); @@ -1582,22 +1587,53 @@ /******************************************************************** * * sifdefaultroute - assign a default route through the address given. - */ - -int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway) -{ - struct rtentry rt; - - if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) { - if (rt.rt_flags & RTF_GATEWAY) - error("not replacing existing default route via %I", - SIN_ADDR(rt.rt_gateway)); - else - error("not replacing existing default route through %s", - rt.rt_dev); - return 0; + * + * If the global default_rt_repl_rest flag is set, then this function + * already replaced the original system defaultroute with some other + * route and it should just replace the current defaultroute with + * another one, without saving the current route. Use: demand mode, + * when pppd sets first a defaultroute it it's temporary ppp0 addresses + * and then changes the temporary addresses to the addresses for the real + * ppp connection when it has come up. + */ + +int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway, bool replace) +{ + struct rtentry rt, tmp_rt; + struct rtentry *del_rt = NULL; + + if (default_rt_repl_rest) { + /* We have already reclaced the original defaultroute, if we + * are called again, we will delete the current default route + * and set the new default route in this function. + * - this is normally only the case the doing demand: */ + if (defaultroute_exists( &tmp_rt )) + del_rt = &tmp_rt; + } else if ( defaultroute_exists( &old_def_rt ) && + strcmp( old_def_rt.rt_dev, ifname ) != 0) { + /* We did not yet replace an existing default route, let's + * check if we should save and replace a default route: + */ + u_int32_t old_gateway = SIN_ADDR(old_def_rt.rt_gateway); + + if (old_gateway != gateway) { + if (!replace) { + error("not replacing default route to %s [%I]", + old_def_rt.rt_dev, old_gateway); + return 0; + } else { + // we need to copy rt_dev because we need it permanent too: + char * tmp_dev = malloc(strlen(old_def_rt.rt_dev)+1); + strcpy(tmp_dev, old_def_rt.rt_dev); + old_def_rt.rt_dev = tmp_dev; + + notice("replacing old default route to %s [%I]", + old_def_rt.rt_dev, old_gateway); + default_rt_repl_rest = 1; + del_rt = &old_def_rt; + } + } } - memset (&rt, 0, sizeof (rt)); SET_SA_FAMILY (rt.rt_dst, AF_INET); @@ -1614,6 +1650,12 @@ error("default route ioctl(SIOCADDRT): %m"); return 0; } + if (default_rt_repl_rest && del_rt) + if (ioctl(sock_fd, SIOCDELRT, del_rt) < 0) { + if ( ! ok_error ( errno )) + error("del old default route ioctl(SIOCDELRT): %m(%d)", errno); + return 0; + } have_default_route = 1; return 1; @@ -1647,6 +1689,16 @@ return 0; } } + if (default_rt_repl_rest) { + notice("restoring old default route to %s [%I]", + old_def_rt.rt_dev, SIN_ADDR(old_def_rt.rt_gateway)); + if (ioctl(sock_fd, SIOCADDRT, &old_def_rt) < 0) { + if ( ! ok_error ( errno )) + error("restore default route ioctl(SIOCADDRT): %m(%d)", errno); + return 0; + } + default_rt_repl_rest = 0; + } return 1; }
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