diff options
Diffstat (limited to 'release/src/router/busybox/networking/route.c')
| -rw-r--r-- | release/src/router/busybox/networking/route.c | 1034 |
1 files changed, 514 insertions, 520 deletions
diff --git a/release/src/router/busybox/networking/route.c b/release/src/router/busybox/networking/route.c index ff74cfd1..5d254080 100644 --- a/release/src/router/busybox/networking/route.c +++ b/release/src/router/busybox/networking/route.c @@ -1,3 +1,4 @@ +/* vi: set sw=4 ts=4: */ /* route * * Similar to the standard Unix route, but with only the necessary @@ -9,13 +10,8 @@ * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org> * (derived from FvK's 'route.c 1.70 01/04/94') * - * This program is free software; you can redistribute it - * and/or modify it under the terms of the GNU General - * Public License as published by the Free Software - * Foundation; either version 2 of the License, or (at - * your option) any later version. + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. * - * $Id: route.c,v 1.1.3.1 2004/12/29 07:07:46 honor Exp $ * * displayroute() code added by Vladimir N. Oleynik <dzo@simtreas.ru> * adjustments by Larry Doolittle <LRDoolittle@lbl.gov> @@ -23,46 +19,38 @@ * IPV6 support added by Bart Visscher <magick@linux-fan.com> */ -#include <sys/types.h> -#include <sys/ioctl.h> -#include "inet_common.h" +/* 2004/03/09 Manuel Novoa III <mjn3@codepoet.org> + * + * Rewritten to fix several bugs, add additional error checking, and + * remove ridiculous amounts of bloat. + */ + #include <net/route.h> #include <net/if.h> -#include <stdio.h> -#include <errno.h> -#include <fcntl.h> -#include <stdlib.h> -#include <string.h> -#include <getopt.h> -#include <unistd.h> -#include <ctype.h> -#include "busybox.h" - -#define _(x) x - -#define RTACTION_ADD 1 -#define RTACTION_DEL 2 -#define RTACTION_HELP 3 -#define RTACTION_FLUSH 4 -#define RTACTION_SHOW 5 - -#define E_NOTFOUND 8 -#define E_SOCK 7 -#define E_LOOKUP 6 -#define E_VERSION 5 -#define E_USAGE 4 -#define E_OPTERR 3 -#define E_INTERN 2 -#define E_NOSUPP 1 - -#if defined (SIOCADDRTOLD) || defined (RTF_IRTT) /* route */ -#define HAVE_NEW_ADDRT 1 + +#include "libbb.h" +#include "inet_common.h" + + +#ifndef RTF_UP +/* Keep this in sync with /usr/src/linux/include/linux/route.h */ +#define RTF_UP 0x0001 /* route usable */ +#define RTF_GATEWAY 0x0002 /* destination is a gateway */ +#define RTF_HOST 0x0004 /* host entry (net otherwise) */ +#define RTF_REINSTATE 0x0008 /* reinstate route after tmout */ +#define RTF_DYNAMIC 0x0010 /* created dyn. (by redirect) */ +#define RTF_MODIFIED 0x0020 /* modified dyn. (by redirect) */ +#define RTF_MTU 0x0040 /* specific MTU for this route */ +#ifndef RTF_MSS +#define RTF_MSS RTF_MTU /* Compatibility :-( */ #endif -#ifdef RTF_IRTT /* route */ -#define HAVE_RTF_IRTT 1 +#define RTF_WINDOW 0x0080 /* per route window clamping */ +#define RTF_IRTT 0x0100 /* Initial round trip time */ +#define RTF_REJECT 0x0200 /* Reject route */ #endif -#ifdef RTF_REJECT /* route */ -#define HAVE_RTF_REJECT 1 + +#if defined(SIOCADDRTOLD) || defined(RTF_IRTT) /* route */ +#define HAVE_NEW_ADDRT 1 #endif #if HAVE_NEW_ADDRT @@ -73,633 +61,639 @@ #define full_mask(x) (((struct sockaddr_in *)&(x))->sin_addr.s_addr) #endif +/* The RTACTION entries must agree with tbl_verb[] below! */ +#define RTACTION_ADD 1 +#define RTACTION_DEL 2 + +/* For the various tbl_*[] arrays, the 1st byte is the offset to + * the next entry and the 2nd byte is return value. */ + +#define NET_FLAG 1 +#define HOST_FLAG 2 + +/* We remap '-' to '#' to avoid problems with getopt. */ +static const char tbl_hash_net_host[] ALIGN1 = + "\007\001#net\0" +/* "\010\002#host\0" */ + "\007\002#host" /* Since last, we can save a byte. */ +; + +#define KW_TAKES_ARG 020 +#define KW_SETS_FLAG 040 + +#define KW_IPVx_METRIC 020 +#define KW_IPVx_NETMASK 021 +#define KW_IPVx_GATEWAY 022 +#define KW_IPVx_MSS 023 +#define KW_IPVx_WINDOW 024 +#define KW_IPVx_IRTT 025 +#define KW_IPVx_DEVICE 026 + +#define KW_IPVx_FLAG_ONLY 040 +#define KW_IPVx_REJECT 040 +#define KW_IPVx_MOD 041 +#define KW_IPVx_DYN 042 +#define KW_IPVx_REINSTATE 043 + +static const char tbl_ipvx[] ALIGN1 = + /* 020 is the "takes an arg" bit */ +#if HAVE_NEW_ADDRT + "\011\020metric\0" +#endif + "\012\021netmask\0" + "\005\022gw\0" + "\012\022gateway\0" + "\006\023mss\0" + "\011\024window\0" +#ifdef RTF_IRTT + "\007\025irtt\0" +#endif + "\006\026dev\0" + "\011\026device\0" + /* 040 is the "sets a flag" bit - MUST match flags_ipvx[] values below. */ +#ifdef RTF_REJECT + "\011\040reject\0" +#endif + "\006\041mod\0" + "\006\042dyn\0" +/* "\014\043reinstate\0" */ + "\013\043reinstate" /* Since last, we can save a byte. */ +; + +static const int flags_ipvx[] = { /* MUST match tbl_ipvx[] values above. */ +#ifdef RTF_REJECT + RTF_REJECT, +#endif + RTF_MODIFIED, + RTF_DYNAMIC, + RTF_REINSTATE +}; +static int kw_lookup(const char *kwtbl, char ***pargs) +{ + if (**pargs) { + do { + if (strcmp(kwtbl+2, **pargs) == 0) { /* Found a match. */ + *pargs += 1; + if (kwtbl[1] & KW_TAKES_ARG) { + if (!**pargs) { /* No more args! */ + bb_show_usage(); + } + *pargs += 1; /* Calling routine will use args[-1]. */ + } + return kwtbl[1]; + } + kwtbl += *kwtbl; + } while (*kwtbl); + } + return 0; +} -/* add or delete a route depending on action */ +/* Add or delete a route, depending on action. */ -static int INET_setroute(int action, int options, char **args) +static void INET_setroute(int action, char **args) { struct rtentry rt; - char target[128], gateway[128] = "NONE"; - const char *netmask = bb_INET_default; - int xflag, isnet; - int skfd; + const char *netmask = NULL; + int skfd, isnet, xflag; - xflag = 0; + /* Grab the -net or -host options. Remember they were transformed. */ + xflag = kw_lookup(tbl_hash_net_host, &args); - if (*args == NULL) + /* If we did grab -net or -host, make sure we still have an arg left. */ + if (*args == NULL) { bb_show_usage(); - if (strcmp(*args, "-net") == 0) { - xflag = 1; - args++; - } else if (strcmp(*args, "-host") == 0) { - xflag = 2; - args++; } - if (*args == NULL) - bb_show_usage(); - safe_strncpy(target, *args++, (sizeof target)); /* Clean out the RTREQ structure. */ - memset((char *) &rt, 0, sizeof(struct rtentry)); + memset(&rt, 0, sizeof(rt)); + { + const char *target = *args++; + char *prefix; - if ((isnet = - INET_resolve(target, (struct sockaddr_in *) &rt.rt_dst, - xflag != 1)) < 0) { - bb_error_msg(_("can't resolve %s"), target); - return EXIT_FAILURE; /* XXX change to E_something */ - } - - switch (xflag) { - case 1: - isnet = 1; - break; + /* recognize x.x.x.x/mask format. */ + prefix = strchr(target, '/'); + if (prefix) { + int prefix_len; - case 2: - isnet = 0; - break; + prefix_len = xatoul_range(prefix+1, 0, 32); + mask_in_addr(rt) = htonl( ~ (0xffffffffUL >> prefix_len)); + *prefix = '\0'; +#if HAVE_NEW_ADDRT + rt.rt_genmask.sa_family = AF_INET; +#endif + } else { + /* Default netmask. */ + netmask = bb_str_default; + } + /* Prefer hostname lookup is -host flag (xflag==1) was given. */ + isnet = INET_resolve(target, (struct sockaddr_in *) &rt.rt_dst, + (xflag & HOST_FLAG)); + if (isnet < 0) { + bb_error_msg_and_die("resolving %s", target); + } + if (prefix) { + /* do not destroy prefix for process args */ + *prefix = '/'; + } + } - default: - break; + if (xflag) { /* Reinit isnet if -net or -host was specified. */ + isnet = (xflag & NET_FLAG); } /* Fill in the other fields. */ - rt.rt_flags = (RTF_UP | RTF_HOST); - if (isnet) - rt.rt_flags &= ~RTF_HOST; + rt.rt_flags = ((isnet) ? RTF_UP : (RTF_UP | RTF_HOST)); while (*args) { - if (strcmp(*args, "metric") == 0) { - int metric; + int k = kw_lookup(tbl_ipvx, &args); + const char *args_m1 = args[-1]; + + if (k & KW_IPVx_FLAG_ONLY) { + rt.rt_flags |= flags_ipvx[k & 3]; + continue; + } - args++; - if (!*args || !isdigit(**args)) - bb_show_usage(); - metric = atoi(*args); #if HAVE_NEW_ADDRT - rt.rt_metric = metric + 1; -#else - ENOSUPP("inet_setroute", "NEW_ADDRT (metric)"); /* XXX Fixme */ -#endif - args++; + if (k == KW_IPVx_METRIC) { + rt.rt_metric = xatoul(args_m1) + 1; continue; } +#endif - if (strcmp(*args, "netmask") == 0) { + if (k == KW_IPVx_NETMASK) { struct sockaddr mask; - args++; - if (!*args || mask_in_addr(rt)) + if (mask_in_addr(rt)) { bb_show_usage(); - netmask = *args; - if ((isnet = - INET_resolve(netmask, (struct sockaddr_in *) &mask, - 0)) < 0) { - bb_error_msg(_("can't resolve netmask %s"), netmask); - return E_LOOKUP; + } + + netmask = args_m1; + isnet = INET_resolve(netmask, (struct sockaddr_in *) &mask, 0); + if (isnet < 0) { + bb_error_msg_and_die("resolving %s", netmask); } rt.rt_genmask = full_mask(mask); - args++; continue; } - if (strcmp(*args, "gw") == 0 || strcmp(*args, "gateway") == 0) { - args++; - if (!*args) - bb_show_usage(); - if (rt.rt_flags & RTF_GATEWAY) + if (k == KW_IPVx_GATEWAY) { + if (rt.rt_flags & RTF_GATEWAY) { bb_show_usage(); - safe_strncpy(gateway, *args, (sizeof gateway)); - if ((isnet = - INET_resolve(gateway, (struct sockaddr_in *) &rt.rt_gateway, - 1)) < 0) { - bb_error_msg(_("can't resolve gw %s"), gateway); - return E_LOOKUP; } + + isnet = INET_resolve(args_m1, + (struct sockaddr_in *) &rt.rt_gateway, 1); + rt.rt_flags |= RTF_GATEWAY; + if (isnet) { - bb_error_msg(_("%s: cannot use a NETWORK as gateway!"), gateway); - return E_OPTERR; + if (isnet < 0) { + bb_error_msg_and_die("resolving %s", args_m1); + } + bb_error_msg_and_die("gateway %s is a NETWORK", args_m1); } - rt.rt_flags |= RTF_GATEWAY; - args++; continue; } - if (strcmp(*args, "mss") == 0) { - args++; + if (k == KW_IPVx_MSS) { /* Check valid MSS bounds. */ rt.rt_flags |= RTF_MSS; - if (!*args) - bb_show_usage(); - rt.rt_mss = atoi(*args); - args++; - if (rt.rt_mss < 64 || rt.rt_mss > 32768) { - bb_error_msg(_("Invalid MSS.")); - return E_OPTERR; - } + rt.rt_mss = xatoul_range(args_m1, 64, 32768); continue; } - if (strcmp(*args, "window") == 0) { - args++; - if (!*args) - bb_show_usage(); + if (k == KW_IPVx_WINDOW) { /* Check valid window bounds. */ rt.rt_flags |= RTF_WINDOW; - rt.rt_window = atoi(*args); - args++; - if (rt.rt_window < 128) { - bb_error_msg(_("Invalid window.")); - return E_OPTERR; - } + rt.rt_window = xatoul_range(args_m1, 128, INT_MAX); continue; } - if (strcmp(*args, "irtt") == 0) { - args++; - if (!*args) - bb_show_usage(); - args++; -#if HAVE_RTF_IRTT +#ifdef RTF_IRTT + if (k == KW_IPVx_IRTT) { rt.rt_flags |= RTF_IRTT; - rt.rt_irtt = atoi(*(args - 1)); + rt.rt_irtt = xatoul(args_m1); rt.rt_irtt *= (sysconf(_SC_CLK_TCK) / 100); /* FIXME */ #if 0 /* FIXME: do we need to check anything of this? */ if (rt.rt_irtt < 1 || rt.rt_irtt > (120 * HZ)) { - bb_error_msg(_("Invalid initial rtt.")); - return E_OPTERR; + bb_error_msg_and_die("bad irtt"); } #endif -#else - ENOSUPP("inet_setroute", "RTF_IRTT"); /* XXX Fixme */ -#endif continue; } - - if (strcmp(*args, "reject") == 0) { - args++; -#if HAVE_RTF_REJECT - rt.rt_flags |= RTF_REJECT; -#else - ENOSUPP("inet_setroute", "RTF_REJECT"); /* XXX Fixme */ #endif + + /* Device is special in that it can be the last arg specified + * and doesn't requre the dev/device keyword in that case. */ + if (!rt.rt_dev && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) { + /* Don't use args_m1 here since args may have changed! */ + rt.rt_dev = args[-1]; continue; } - if (strcmp(*args, "mod") == 0) { - args++; - rt.rt_flags |= RTF_MODIFIED; - continue; - } - if (strcmp(*args, "dyn") == 0) { - args++; - rt.rt_flags |= RTF_DYNAMIC; - continue; - } - if (strcmp(*args, "reinstate") == 0) { - args++; - rt.rt_flags |= RTF_REINSTATE; - continue; - } - if (strcmp(*args, "device") == 0 || strcmp(*args, "dev") == 0) { - args++; - if (rt.rt_dev || *args == NULL) - bb_show_usage(); - rt.rt_dev = *args++; - continue; - } - /* nothing matches */ - if (!rt.rt_dev) { - rt.rt_dev = *args++; - if (*args) - bb_show_usage(); /* must be last to catch typos */ - } else { - bb_show_usage(); - } + + /* Nothing matched. */ + bb_show_usage(); } -#if HAVE_RTF_REJECT - if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev) - rt.rt_dev = "lo"; +#ifdef RTF_REJECT + if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev) { + rt.rt_dev = (char*)"lo"; + } #endif /* sanity checks.. */ if (mask_in_addr(rt)) { - unsigned long mask = mask_in_addr(rt); + uint32_t mask = mask_in_addr(rt); mask = ~ntohl(mask); if ((rt.rt_flags & RTF_HOST) && mask != 0xffffffff) { - bb_error_msg(_("netmask %.8x doesn't make sense with host route"), - (unsigned int) mask); - return E_OPTERR; + bb_error_msg_and_die("netmask %.8x and host route conflict", + (unsigned int) mask); } if (mask & (mask + 1)) { - bb_error_msg(_("bogus netmask %s"), netmask); - return E_OPTERR; + bb_error_msg_and_die("bogus netmask %s", netmask); } mask = ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr; - if (mask & ~mask_in_addr(rt)) { - bb_error_msg(_("netmask doesn't match route address")); - return E_OPTERR; + if (mask & ~(uint32_t)mask_in_addr(rt)) { + bb_error_msg_and_die("netmask and route address conflict"); } } + /* Fill out netmask if still unset */ - if ((action == RTACTION_ADD) && rt.rt_flags & RTF_HOST) + if ((action == RTACTION_ADD) && (rt.rt_flags & RTF_HOST)) { mask_in_addr(rt) = 0xffffffff; + } /* Create a socket to the INET kernel. */ - if ((skfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { - perror("socket"); - return E_SOCK; - } - /* Tell the kernel to accept this route. */ - if (action == RTACTION_DEL) { - if (ioctl(skfd, SIOCDELRT, &rt) < 0) { - perror("SIOCDELRT"); - close(skfd); - return E_SOCK; - } - } else { - if (ioctl(skfd, SIOCADDRT, &rt) < 0) { - perror("SIOCADDRT"); - close(skfd); - return E_SOCK; - } - } + skfd = xsocket(AF_INET, SOCK_DGRAM, 0); - /* Close the socket. */ - (void) close(skfd); - return EXIT_SUCCESS; + if (action == RTACTION_ADD) + xioctl(skfd, SIOCADDRT, &rt); + else + xioctl(skfd, SIOCDELRT, &rt); + + if (ENABLE_FEATURE_CLEAN_UP) close(skfd); } -#ifdef CONFIG_FEATURE_IPV6 -static int INET6_setroute(int action, int options, char **args) +#if ENABLE_FEATURE_IPV6 + +static void INET6_setroute(int action, char **args) { - struct in6_rtmsg rt; - struct ifreq ifr; struct sockaddr_in6 sa6; - char target[128], gateway[128] = "NONE"; - int metric, prefix_len; - char *devname = NULL; - char *cp; - int skfd; + struct in6_rtmsg rt; + int prefix_len, skfd; + const char *devname; - if (*args == NULL) - bb_show_usage(); + /* We know args isn't NULL from the check in route_main. */ + const char *target = *args++; - strcpy(target, *args++); - if (!strcmp(target, "default")) { - prefix_len = 0; - memset(&sa6, 0, sizeof(sa6)); - } else { - if ((cp = strchr(target, '/'))) { - prefix_len = atol(cp + 1); - if ((prefix_len < 0) || (prefix_len > 128)) - bb_show_usage(); - *cp = 0; + if (strcmp(target, bb_str_default) == 0) { + prefix_len = 0; + memset(&sa6, 0, sizeof(sa6)); } else { - prefix_len = 128; - } - if (INET6_resolve(target, (struct sockaddr_in6 *) &sa6) < 0) { - bb_error_msg(_("can't resolve %s"), target); - return EXIT_FAILURE; /* XXX change to E_something */ + char *cp; + cp = strchr(target, '/'); /* Yes... const to non is ok. */ + if (cp) { + *cp = '\0'; + prefix_len = xatoul_range(cp + 1, 0, 128); + } else { + prefix_len = 128; + } + if (INET6_resolve(target, (struct sockaddr_in6 *) &sa6) < 0) { + bb_error_msg_and_die("resolving %s", target); + } } - } /* Clean out the RTREQ structure. */ - memset((char *) &rt, 0, sizeof(struct in6_rtmsg)); + memset(&rt, 0, sizeof(rt)); memcpy(&rt.rtmsg_dst, sa6.sin6_addr.s6_addr, sizeof(struct in6_addr)); /* Fill in the other fields. */ - rt.rtmsg_flags = RTF_UP; - if (prefix_len == 128) - rt.rtmsg_flags |= RTF_HOST; - rt.rtmsg_metric = 1; rt.rtmsg_dst_len = prefix_len; + rt.rtmsg_flags = ((prefix_len == 128) ? (RTF_UP|RTF_HOST) : RTF_UP); + rt.rtmsg_metric = 1; + + devname = NULL; while (*args) { - if (!strcmp(*args, "metric")) { + int k = kw_lookup(tbl_ipvx, &args); + const char *args_m1 = args[-1]; - args++; - if (!*args || !isdigit(**args)) - bb_show_usage(); - metric = atoi(*args); - rt.rtmsg_metric = metric; - args++; + if ((k == KW_IPVx_MOD) || (k == KW_IPVx_DYN)) { + rt.rtmsg_flags |= flags_ipvx[k & 3]; continue; } - if (!strcmp(*args, "gw") || !strcmp(*args, "gateway")) { - args++; - if (!*args) - bb_show_usage(); - if (rt.rtmsg_flags & RTF_GATEWAY) + + if (k == KW_IPVx_METRIC) { + rt.rtmsg_metric = xatoul(args_m1); + continue; + } + + if (k == KW_IPVx_GATEWAY) { + if (rt.rtmsg_flags & RTF_GATEWAY) { bb_show_usage(); - strcpy(gateway, *args); - if (INET6_resolve(gateway, (struct sockaddr_in6 *) &sa6) < 0) { - bb_error_msg(_("can't resolve gw %s"), gateway); - return (E_LOOKUP); + } + + if (INET6_resolve(args_m1, (struct sockaddr_in6 *) &sa6) < 0) { + bb_error_msg_and_die("resolving %s", args_m1); } memcpy(&rt.rtmsg_gateway, sa6.sin6_addr.s6_addr, sizeof(struct in6_addr)); rt.rtmsg_flags |= RTF_GATEWAY; - args++; continue; } - if (!strcmp(*args, "mod")) { - args++; - rt.rtmsg_flags |= RTF_MODIFIED; - continue; - } - if (!strcmp(*args, "dyn")) { - args++; - rt.rtmsg_flags |= RTF_DYNAMIC; + + /* Device is special in that it can be the last arg specified + * and doesn't requre the dev/device keyword in that case. */ + if (!devname && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) { + /* Don't use args_m1 here since args may have changed! */ + devname = args[-1]; continue; } - if (!strcmp(*args, "device") || !strcmp(*args, "dev")) { - args++; - if (!*args) - bb_show_usage(); - } else if (args[1]) - bb_show_usage(); - devname = *args; - args++; + /* Nothing matched. */ + bb_show_usage(); } /* Create a socket to the INET6 kernel. */ - if ((skfd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { - perror("socket"); - return (E_SOCK); - } + skfd = xsocket(AF_INET6, SOCK_DGRAM, 0); + + rt.rtmsg_ifindex = 0; + if (devname) { + struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); - strcpy(ifr.ifr_name, devname); - - if (ioctl(skfd, SIOGIFINDEX, &ifr) < 0) { - perror("SIOGIFINDEX"); - return (E_SOCK); - } + strncpy_IFNAMSIZ(ifr.ifr_name, devname); + xioctl(skfd, SIOGIFINDEX, &ifr); rt.rtmsg_ifindex = ifr.ifr_ifindex; - } else - rt.rtmsg_ifindex = 0; + } /* Tell the kernel to accept this route. */ - if (action == RTACTION_DEL) { - if (ioctl(skfd, SIOCDELRT, &rt) < 0) { - perror("SIOCDELRT"); - close(skfd); - return (E_SOCK); - } - } else { - if (ioctl(skfd, SIOCADDRT, &rt) < 0) { - perror("SIOCADDRT"); - close(skfd); - return (E_SOCK); - } - } + if (action == RTACTION_ADD) + xioctl(skfd, SIOCADDRT, &rt); + else + xioctl(skfd, SIOCDELRT, &rt); - /* Close the socket. */ - (void) close(skfd); - return (0); + if (ENABLE_FEATURE_CLEAN_UP) close(skfd); } #endif -#ifndef RTF_UP -/* Keep this in sync with /usr/src/linux/include/linux/route.h */ -#define RTF_UP 0x0001 /* route usable */ -#define RTF_GATEWAY 0x0002 /* destination is a gateway */ -#define RTF_HOST 0x0004 /* host entry (net otherwise) */ -#define RTF_REINSTATE 0x0008 /* reinstate route after tmout */ -#define RTF_DYNAMIC 0x0010 /* created dyn. (by redirect) */ -#define RTF_MODIFIED 0x0020 /* modified dyn. (by redirect) */ -#define RTF_MTU 0x0040 /* specific MTU for this route */ -#ifndef RTF_MSS -#define RTF_MSS RTF_MTU /* Compatibility :-( */ +static const unsigned flagvals[] = { /* Must agree with flagchars[]. */ + RTF_GATEWAY, + RTF_HOST, + RTF_REINSTATE, + RTF_DYNAMIC, + RTF_MODIFIED, +#if ENABLE_FEATURE_IPV6 + RTF_DEFAULT, + RTF_ADDRCONF, + RTF_CACHE #endif -#define RTF_WINDOW 0x0080 /* per route window clamping */ -#define RTF_IRTT 0x0100 /* Initial round trip time */ -#define RTF_REJECT 0x0200 /* Reject route */ +}; + +#define IPV4_MASK (RTF_GATEWAY|RTF_HOST|RTF_REINSTATE|RTF_DYNAMIC|RTF_MODIFIED) +#define IPV6_MASK (RTF_GATEWAY|RTF_HOST|RTF_DEFAULT|RTF_ADDRCONF|RTF_CACHE) + +/* Must agree with flagvals[]. */ +static const char flagchars[] ALIGN1 = + "GHRDM" +#if ENABLE_FEATURE_IPV6 + "DAC" #endif +; -void displayroutes(int noresolve, int netstatfmt) +static void set_flags(char *flagstr, int flags) { - char buff[256]; - int nl = 0; - struct in_addr dest; - struct in_addr gw; - struct in_addr mask; + int i; + + *flagstr++ = 'U'; + + for (i = 0; (*flagstr = flagchars[i]) != 0; i++) { + if (flags & flagvals[i]) { + ++flagstr; + } + } +} + +/* also used in netstat */ +void FAST_FUNC bb_displayroutes(int noresolve, int netstatfmt) +{ + char devname[64], flags[16], *sdest, *sgw; + unsigned long d, g, m; int flgs, ref, use, metric, mtu, win, ir; - char flags[64]; - unsigned long int d, g, m; - - char sdest[16], sgw[16]; - - FILE *fp = bb_xfopen("/proc/net/route", "r"); - - if (noresolve) - noresolve = 0x0fff; - - printf("Kernel IP routing table\n"); - printf - ("Destination Gateway Genmask Flags %s Iface\n", - netstatfmt ? " MSS Window irtt" : "Metric Ref Use"); - - while (fgets(buff, sizeof(buff), fp) != NULL) { - if (nl) { - int ifl = 0; - int numeric; - struct sockaddr_in s_addr; - - while (buff[ifl] != ' ' && buff[ifl] != '\t' && buff[ifl] != '\0') - ifl++; - buff[ifl] = 0; /* interface */ - if (sscanf(buff + ifl + 1, "%lx%lx%X%d%d%d%lx%d%d%d", - &d, &g, &flgs, &ref, &use, &metric, &m, &mtu, &win, - &ir) != 10) { - bb_error_msg_and_die("Unsuported kernel route format\n"); - } - ifl = 0; /* parse flags */ - if (flgs & RTF_UP) { - if (flgs & RTF_REJECT) - flags[ifl++] = '!'; - else - flags[ifl++] = 'U'; - if (flgs & RTF_GATEWAY) - flags[ifl++] = 'G'; - if (flgs & RTF_HOST) - flags[ifl++] = 'H'; - if (flgs & RTF_REINSTATE) - flags[ifl++] = 'R'; - if (flgs & RTF_DYNAMIC) - flags[ifl++] = 'D'; - if (flgs & RTF_MODIFIED) - flags[ifl++] = 'M'; - flags[ifl] = 0; - dest.s_addr = d; - gw.s_addr = g; - mask.s_addr = m; - memset(&s_addr, 0, sizeof(struct sockaddr_in)); - s_addr.sin_family = AF_INET; - s_addr.sin_addr = dest; - numeric = noresolve | 0x8000; /* default instead of * */ - INET_rresolve(sdest, sizeof(sdest), &s_addr, numeric, m); - numeric = noresolve | 0x4000; /* host instead of net */ - s_addr.sin_addr = gw; - INET_rresolve(sgw, sizeof(sgw), &s_addr, numeric, m); - - printf("%-16s%-16s%-16s%-6s", sdest, sgw, inet_ntoa(mask), - flags); - if (netstatfmt) - printf("%5d %-5d %6d %s\n", mtu, win, ir, buff); - else - printf("%-6d %-2d %7d %s\n", metric, ref, use, buff); + struct sockaddr_in s_addr; + struct in_addr mask; + + FILE *fp = xfopen_for_read("/proc/net/route"); + + printf("Kernel IP routing table\n" + "Destination Gateway Genmask Flags %s Iface\n", + netstatfmt ? " MSS Window irtt" : "Metric Ref Use"); + + if (fscanf(fp, "%*[^\n]\n") < 0) { /* Skip the first line. */ + goto ERROR; /* Empty or missing line, or read error. */ + } + while (1) { + int r; + r = fscanf(fp, "%63s%lx%lx%X%d%d%d%lx%d%d%d\n", + devname, &d, &g, &flgs, &ref, &use, &metric, &m, + &mtu, &win, &ir); + if (r != 11) { + if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */ + break; } + ERROR: + bb_error_msg_and_die("fscanf"); + } + + if (!(flgs & RTF_UP)) { /* Skip interfaces that are down. */ + continue; + } + + set_flags(flags, (flgs & IPV4_MASK)); +#ifdef RTF_REJECT + if (flgs & RTF_REJECT) { + flags[0] = '!'; + } +#endif + + memset(&s_addr, 0, sizeof(struct sockaddr_in)); + s_addr.sin_family = AF_INET; + s_addr.sin_addr.s_addr = d; + sdest = INET_rresolve(&s_addr, (noresolve | 0x8000), m); /* 'default' instead of '*' */ + s_addr.sin_addr.s_addr = g; + sgw = INET_rresolve(&s_addr, (noresolve | 0x4000), m); /* Host instead of net */ + mask.s_addr = m; + /* "%15.15s" truncates hostnames, do we really want that? */ + printf("%-15.15s %-15.15s %-16s%-6s", sdest, sgw, inet_ntoa(mask), flags); + free(sdest); + free(sgw); + if (netstatfmt) { + printf("%5d %-5d %6d %s\n", mtu, win, ir, devname); + } else { + printf("%-6d %-2d %7d %s\n", metric, ref, use, devname); } - nl++; } } -#ifdef CONFIG_FEATURE_IPV6 -static void INET6_displayroutes(int noresolve) +#if ENABLE_FEATURE_IPV6 + +static void INET6_displayroutes(void) { - char buff[256]; + char addr6[128], *naddr6; + /* In addr6x, we store both 40-byte ':'-delimited ipv6 addresses. + * We read the non-delimited strings into the tail of the buffer + * using fscanf and then modify the buffer by shifting forward + * while inserting ':'s and the nul terminator for the first string. + * Hence the strings are at addr6x and addr6x+40. This generates + * _much_ less code than the previous (upstream) approach. */ + char addr6x[80]; char iface[16], flags[16]; - char addr6[128], naddr6[128]; - struct sockaddr_in6 saddr6, snaddr6; int iflags, metric, refcnt, use, prefix_len, slen; - int numeric; - - char addr6p[8][5], saddr6p[8][5], naddr6p[8][5]; - - FILE *fp = bb_xfopen("/proc/net/ipv6_route", "r"); - - flags[0] = 'U'; - - if (noresolve) - noresolve = 0x0fff; - numeric = noresolve | 0x8000; /* default instead of * */ - - printf("Kernel IPv6 routing table\n" - "Destination " - "Next Hop " - "Flags Metric Ref Use Iface\n"); - - while (fgets(buff, sizeof(buff), fp) != NULL) { - int ifl; - - if (sscanf(buff, "%4s%4s%4s%4s%4s%4s%4s%4s %02x " - "%4s%4s%4s%4s%4s%4s%4s%4s %02x " - "%4s%4s%4s%4s%4s%4s%4s%4s %08x %08x %08x %08x %s\n", - addr6p[0], addr6p[1], addr6p[2], addr6p[3], - addr6p[4], addr6p[5], addr6p[6], addr6p[7], - &prefix_len, - saddr6p[0], saddr6p[1], saddr6p[2], saddr6p[3], - saddr6p[4], saddr6p[5], saddr6p[6], saddr6p[7], - &slen, - naddr6p[0], naddr6p[1], naddr6p[2], naddr6p[3], - naddr6p[4], naddr6p[5], naddr6p[6], naddr6p[7], - &metric, &use, &refcnt, &iflags, iface) != 31) { - bb_error_msg_and_die("Unsuported kernel route format\n"); + struct sockaddr_in6 snaddr6; + + FILE *fp = xfopen_for_read("/proc/net/ipv6_route"); + + printf("Kernel IPv6 routing table\n%-44s%-40s" + "Flags Metric Ref Use Iface\n", + "Destination", "Next Hop"); + + while (1) { + int r; + r = fscanf(fp, "%32s%x%*s%x%32s%x%x%x%x%s\n", + addr6x+14, &prefix_len, &slen, addr6x+40+7, + &metric, &use, &refcnt, &iflags, iface); + if (r != 9) { + if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */ + break; + } + ERROR: + bb_error_msg_and_die("fscanf"); } - ifl = 1; /* parse flags */ - if (!(iflags & RTF_UP)) + /* Do the addr6x shift-and-insert changes to ':'-delimit addresses. + * For now, always do this to validate the proc route format, even + * if the interface is down. */ + { + int i = 0; + char *p = addr6x+14; + + do { + if (!*p) { + if (i == 40) { /* nul terminator for 1st address? */ + addr6x[39] = 0; /* Fixup... need 0 instead of ':'. */ + ++p; /* Skip and continue. */ + continue; + } + goto ERROR; + } + addr6x[i++] = *p++; + if (!((i+1) % 5)) { + addr6x[i++] = ':'; + } + } while (i < 40+28+7); + } + + if (!(iflags & RTF_UP)) { /* Skip interfaces that are down. */ continue; - if (iflags & RTF_GATEWAY) - flags[ifl++] = 'G'; - if (iflags & RTF_HOST) - flags[ifl++] = 'H'; - if (iflags & RTF_DEFAULT) - flags[ifl++] = 'D'; - if (iflags & RTF_ADDRCONF) - flags[ifl++] = 'A'; - if (iflags & RTF_CACHE) - flags[ifl++] = 'C'; - flags[ifl] = 0; - - /* Fetch and resolve the target address. */ - snprintf(addr6, sizeof(addr6), "%s:%s:%s:%s:%s:%s:%s:%s", - addr6p[0], addr6p[1], addr6p[2], addr6p[3], - addr6p[4], addr6p[5], addr6p[6], addr6p[7]); - inet_pton(AF_INET6, addr6, (struct sockaddr *) &saddr6.sin6_addr); - saddr6.sin6_family = AF_INET6; - - INET6_rresolve(addr6, sizeof(addr6), (struct sockaddr_in6 *) &saddr6, - numeric); - snprintf(addr6, sizeof(addr6), "%s/%d", addr6, prefix_len); - - /* Fetch and resolve the nexthop address. */ - snprintf(naddr6, sizeof(naddr6), "%s:%s:%s:%s:%s:%s:%s:%s", - naddr6p[0], naddr6p[1], naddr6p[2], naddr6p[3], - naddr6p[4], naddr6p[5], naddr6p[6], naddr6p[7]); - inet_pton(AF_INET6, naddr6, (struct sockaddr *) &snaddr6.sin6_addr); - snaddr6.sin6_family = AF_INET6; - - INET6_rresolve(naddr6, sizeof(naddr6), - (struct sockaddr_in6 *) &snaddr6, numeric); - - /* Print the info. */ - printf("%-43s %-39s %-5s %-6d %-2d %7d %-8s\n", - addr6, naddr6, flags, metric, refcnt, use, iface); + } + + set_flags(flags, (iflags & IPV6_MASK)); + + r = 0; + do { + inet_pton(AF_INET6, addr6x + r, + (struct sockaddr *) &snaddr6.sin6_addr); + snaddr6.sin6_family = AF_INET6; + naddr6 = INET6_rresolve((struct sockaddr_in6 *) &snaddr6, + 0x0fff /* Apparently, upstream never resolves. */ + ); + + if (!r) { /* 1st pass */ + snprintf(addr6, sizeof(addr6), "%s/%d", naddr6, prefix_len); + r += 40; + free(naddr6); + } else { /* 2nd pass */ + /* Print the info. */ + printf("%-43s %-39s %-5s %-6d %-2d %7d %-8s\n", + addr6, naddr6, flags, metric, refcnt, use, iface); + free(naddr6); + break; + } + } while (1); } } + #endif -int route_main(int argc, char **argv) +#define ROUTE_OPT_A 0x01 +#define ROUTE_OPT_n 0x02 +#define ROUTE_OPT_e 0x04 +#define ROUTE_OPT_INET6 0x08 /* Not an actual option. See below. */ + +/* 1st byte is offset to next entry offset. 2nd byte is return value. */ +/* 2nd byte matches RTACTION_* code */ +static const char tbl_verb[] ALIGN1 = + "\006\001add\0" + "\006\002del\0" +/* "\011\002delete\0" */ + "\010\002delete" /* Since it's last, we can save a byte. */ +; + +int route_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int route_main(int argc UNUSED_PARAM, char **argv) { - int opt; - int what = 0; - -#ifdef CONFIG_FEATURE_IPV6 - int af = AF_INET; -#endif + unsigned opt; + int what; + char *family; + char **p; + + /* First, remap '-net' and '-host' to avoid getopt problems. */ + p = argv; + while (*++p) { + if (strcmp(*p, "-net") == 0 || strcmp(*p, "-host") == 0) { + p[0][0] = '#'; + } + } - if (!argv[1] || (argv[1][0] == '-')) { - /* check options */ - int noresolve = 0; - int extended = 0; + opt = getopt32(argv, "A:ne", &family); - while ((opt = getopt(argc, argv, "A:ne")) > 0) { - switch (opt) { - case 'n': - noresolve = 1; - break; - case 'e': - extended = 1; - break; - case 'A': -#ifdef CONFIG_FEATURE_IPV6 - if (strcmp(optarg, "inet6") == 0) - af = AF_INET6; - break; + if ((opt & ROUTE_OPT_A) && strcmp(family, "inet") != 0) { +#if ENABLE_FEATURE_IPV6 + if (strcmp(family, "inet6") == 0) { + opt |= ROUTE_OPT_INET6; /* Set flag for ipv6. */ + } else #endif - default: - bb_show_usage(); - } - } + bb_show_usage(); + } + + argv += optind; -#ifdef CONFIG_FEATURE_IPV6 - if (af == AF_INET6) - INET6_displayroutes(*argv != NULL); + /* No more args means display the routing table. */ + if (!*argv) { + int noresolve = (opt & ROUTE_OPT_n) ? 0x0fff : 0; +#if ENABLE_FEATURE_IPV6 + if (opt & ROUTE_OPT_INET6) + INET6_displayroutes(); else #endif - displayroutes(noresolve, extended); - return EXIT_SUCCESS; - } else { - /* check verb */ - if (strcmp(argv[1], "add") == 0) - what = RTACTION_ADD; - else if (strcmp(argv[1], "del") == 0 - || strcmp(argv[1], "delete") == 0) - what = RTACTION_DEL; - else if (strcmp(argv[1], "flush") == 0) - what = RTACTION_FLUSH; - else - bb_show_usage(); + bb_displayroutes(noresolve, opt & ROUTE_OPT_e); + + fflush_stdout_and_exit(EXIT_SUCCESS); + } + + /* Check verb. At the moment, must be add, del, or delete. */ + what = kw_lookup(tbl_verb, &argv); + if (!what || !*argv) { /* Unknown verb or no more args. */ + bb_show_usage(); } -#ifdef CONFIG_FEATURE_IPV6 - if (af == AF_INET6) - return INET6_setroute(what, 0, argv + 2); +#if ENABLE_FEATURE_IPV6 + if (opt & ROUTE_OPT_INET6) + INET6_setroute(what, argv); + else #endif - return INET_setroute(what, 0, argv + 2); + INET_setroute(what, argv); + + return EXIT_SUCCESS; } |