X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=networking%2Froute.c;h=5c092f4522180d6fa8ca7449264399a653f114c1;hb=6c8161d69fe9fce0f862b678aaa84866aaaeff8f;hp=76b2306fde64df8f4a5eff7b8522e3c89f202220;hpb=ec455953008d08f588fe0c0bd9df4278cd188315;p=oweals%2Fbusybox.git diff --git a/networking/route.c b/networking/route.c index 76b2306fd..5c092f452 100644 --- a/networking/route.c +++ b/networking/route.c @@ -1,11 +1,11 @@ /* route * * Similar to the standard Unix route, but with only the necessary - * parts for AF_INET + * parts for AF_INET and AF_INET6 * * Bjorn Wesen, Axis Communications AB * - * Author of the original route: + * Author of the original route: * Fred N. van Kempen, * (derived from FvK's 'route.c 1.70 01/04/94') * @@ -15,75 +15,54 @@ * Foundation; either version 2 of the License, or (at * your option) any later version. * - * $Id: route.c,v 1.1 2001/02/14 08:11:27 andersen Exp $ + * $Id: route.c,v 1.26 2004/03/19 23:27:08 mjn3 Exp $ * + * displayroute() code added by Vladimir N. Oleynik + * adjustments by Larry Doolittle + * + * IPV6 support added by Bart Visscher + */ + +/* 2004/03/09 Manuel Novoa III + * + * Rewritten to fix several bugs, add additional error checking, and + * remove ridiculous amounts of bloat. */ -#include "busybox.h" -#include -#include -#include -#include -#include // HZ -#include -#include #include -#include -#include #include #include -#include +#include +#include #include -#include - -#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 - -/* resolve XXX.YYY.ZZZ.QQQ -> binary */ - -static int -INET_resolve(char *name, struct sockaddr *sa) -{ - struct sockaddr_in *sin = (struct sockaddr_in *)sa; - - sin->sin_family = AF_INET; - sin->sin_port = 0; - - /* Default is special, meaning 0.0.0.0. */ - if (!strcmp(name, "default")) { - sin->sin_addr.s_addr = INADDR_ANY; - return (1); - } - /* Look to see if it's a dotted quad. */ - if (inet_aton(name, &sin->sin_addr)) { - return 0; - } - /* guess not.. */ - return -1; -} - -#if defined (SIOCADDRTOLD) || defined (RTF_IRTT) /* route */ -#define HAVE_NEW_ADDRT 1 +#include +#include +#include +#include +#include +#include +#include "busybox.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 @@ -94,279 +73,642 @@ INET_resolve(char *name, struct sockaddr *sa) #define full_mask(x) (((struct sockaddr_in *)&(x))->sin_addr.s_addr) #endif -/* add or delete a route depending on action */ +/* 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[] = + "\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[] = + /* 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 -INET_setroute(int action, int options, char **args) +static int kw_lookup(const char *kwtbl, char ***pargs) { - struct rtentry rt; - char target[128], gateway[128] = "NONE", netmask[128] = "default"; - int xflag, isnet; - int skfd; - - xflag = 0; - - if (!strcmp(*args, "-net")) { - xflag = 1; - args++; - } else if (!strcmp(*args, "-host")) { - xflag = 2; - args++; + 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); } - if (*args == NULL) - usage(route_usage); + return 0; +} + +/* Add or delete a route, depending on action. */ + +static void INET_setroute(int action, char **args) +{ + struct rtentry rt; + const char *netmask; + int skfd, isnet, xflag; + + assert((action == RTACTION_ADD) || (action == RTACTION_DEL)); - safe_strncpy(target, *args++, (sizeof target)); + /* Grab the -net or -host options. Remember they were transformed. */ + xflag = kw_lookup(tbl_hash_net_host, &args); + + /* If we did grab -net or -host, make sure we still have an arg left. */ + if (*args == NULL) { + bb_show_usage(); + } /* Clean out the RTREQ structure. */ memset((char *) &rt, 0, sizeof(struct rtentry)); + { + const char *target = *args++; + + /* 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 ((isnet = INET_resolve(target, &rt.rt_dst)) < 0) { - fprintf(stderr, "cant resolve %s\n", target); - return (1); } - switch (xflag) { - case 1: - isnet = 1; - break; - - case 2: - isnet = 0; - break; - - 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)); + + netmask = bb_INET_default; while (*args) { - if (!strcmp(*args, "metric")) { - int metric; - - args++; - if (!*args || !isdigit(**args)) - usage(route_usage); - metric = atoi(*args); + 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; + } + #if HAVE_NEW_ADDRT - rt.rt_metric = metric + 1; -#else - ENOSUPP("inet_setroute", "NEW_ADDRT (metric)"); -#endif - args++; + if (k == KW_IPVx_METRIC) { + rt.rt_metric = bb_xgetularg10(args_m1) + 1; continue; } +#endif - if (!strcmp(*args, "netmask")) { + if (k == KW_IPVx_NETMASK) { struct sockaddr mask; - - args++; - if (!*args || mask_in_addr(rt)) - usage(route_usage); - safe_strncpy(netmask, *args, (sizeof netmask)); - if ((isnet = INET_resolve(netmask, &mask)) < 0) { - fprintf(stderr, "cant resolve netmask %s\n", netmask); - return (E_LOOKUP); + + if (mask_in_addr(rt)) { + bb_show_usage(); + } + + 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") || !strcmp(*args, "gateway")) { - args++; - if (!*args) - usage(route_usage); - if (rt.rt_flags & RTF_GATEWAY) - usage(route_usage); - safe_strncpy(gateway, *args, (sizeof gateway)); - if ((isnet = INET_resolve(gateway, &rt.rt_gateway)) < 0) { - fprintf(stderr, "cant resolve gw %s\n", gateway); - return (E_LOOKUP); + if (k == KW_IPVx_GATEWAY) { + if (rt.rt_flags & RTF_GATEWAY) { + bb_show_usage(); } + + isnet = INET_resolve(args_m1, + (struct sockaddr_in *) &rt.rt_gateway, 1); + rt.rt_flags |= RTF_GATEWAY; + if (isnet) { - fprintf(stderr, - _("route: %s: cannot use a NETWORK as gateway!\n"), - 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")) { - args++; + if (k == KW_IPVx_MSS) { /* Check valid MSS bounds. */ rt.rt_flags |= RTF_MSS; - if (!*args) - usage(route_usage); - rt.rt_mss = atoi(*args); - args++; - if (rt.rt_mss < 64 || rt.rt_mss > 32768) { - fprintf(stderr, _("route: Invalid MSS.\n")); - return (E_OPTERR); - } + rt.rt_mss = bb_xgetularg10_bnd(args_m1, 64, 32768); continue; } - if (!strcmp(*args, "window")) { - args++; - if (!*args) - usage(route_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) { - fprintf(stderr, _("route: Invalid window.\n")); - return (E_OPTERR); - } + rt.rt_window = bb_xgetularg10_bnd(args_m1, 128, INT_MAX); continue; } - if (!strcmp(*args, "irtt")) { - args++; - if (!*args) - usage(route_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 *= (HZ / 100); /* FIXME */ -#if 0 /* FIXME: do we need to check anything of this? */ + rt.rt_irtt = bb_xgetularg10(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)) { - fprintf(stderr, _("route: Invalid initial rtt.\n")); - return (E_OPTERR); + bb_error_msg_and_die("bad irtt"); } -#endif -#else - ENOSUPP("inet_setroute", "RTF_IRTT"); #endif continue; } - - if (!strcmp(*args, "reject")) { - args++; -#if HAVE_RTF_REJECT - rt.rt_flags |= RTF_REJECT; -#else - ENOSUPP("inet_setroute", "RTF_REJECT"); #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")) { - args++; - rt.rt_flags |= RTF_MODIFIED; - continue; - } - if (!strcmp(*args, "dyn")) { - args++; - rt.rt_flags |= RTF_DYNAMIC; - continue; - } - if (!strcmp(*args, "reinstate")) { - args++; - rt.rt_flags |= RTF_REINSTATE; - continue; - } - if (!strcmp(*args, "device") || !strcmp(*args, "dev")) { - args++; - if (rt.rt_dev || *args == NULL) - usage(route_usage); - rt.rt_dev = *args++; - continue; - } - /* nothing matches */ - if (!rt.rt_dev) { - rt.rt_dev = *args++; - if (*args) - usage(route_usage); /* must be last to catch typos */ - } else - usage(route_usage); + + /* Nothing matched. */ + bb_show_usage(); } -#if HAVE_RTF_REJECT - if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev) +#ifdef RTF_REJECT + if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev) { rt.rt_dev = "lo"; + } #endif /* sanity checks.. */ if (mask_in_addr(rt)) { unsigned long mask = mask_in_addr(rt); + mask = ~ntohl(mask); if ((rt.rt_flags & RTF_HOST) && mask != 0xffffffff) { - fprintf(stderr, - _("route: netmask %.8x doesn't make sense with host route\n"), - (unsigned int)mask); - return (E_OPTERR); + bb_error_msg_and_die("netmask %.8x and host route conflict", + (unsigned int) mask); } if (mask & (mask + 1)) { - fprintf(stderr, _("route: bogus netmask %s\n"), 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)) { - fprintf(stderr, _("route: netmask doesn't match route address\n")); - return (E_OPTERR); + 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); + bb_perror_msg_and_die("socket"); + } + + if (ioctl(skfd, ((action==RTACTION_ADD) ? SIOCADDRT : SIOCDELRT), &rt)<0) { + bb_perror_msg_and_die("SIOC[ADD|DEL]RT"); } + + /* Don't bother closing, as we're exiting after we return anyway. */ + /* close(skfd); */ +} + +#ifdef CONFIG_FEATURE_IPV6 + +static void INET6_setroute(int action, char **args) +{ + struct sockaddr_in6 sa6; + struct in6_rtmsg rt; + int prefix_len, skfd; + const char *devname; + + assert((action == RTACTION_ADD) || (action == RTACTION_DEL)); + + { + /* We know args isn't NULL from the check in route_main. */ + const char *target = *args++; + + if (strcmp(target, "default") == 0) { + prefix_len = 0; + memset(&sa6, 0, sizeof(sa6)); + } else { + char *cp; + if ((cp = strchr(target, '/'))) { /* Yes... const to non is ok. */ + *cp = 0; + prefix_len = bb_xgetularg10_bnd(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)); + + memcpy(&rt.rtmsg_dst, sa6.sin6_addr.s6_addr, sizeof(struct in6_addr)); + + /* Fill in the other fields. */ + 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) { + int k = kw_lookup(tbl_ipvx, &args); + const char *args_m1 = args[-1]; + + if ((k == KW_IPVx_MOD) || (k == KW_IPVx_DYN)) { + rt.rtmsg_flags |= flags_ipvx[k & 3]; + continue; + } + + if (k == KW_IPVx_METRIC) { + rt.rtmsg_metric = bb_xgetularg10(args_m1); + continue; + } + + if (k == KW_IPVx_GATEWAY) { + if (rt.rtmsg_flags & RTF_GATEWAY) { + bb_show_usage(); + } + + 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; + continue; + } + + /* 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; + } + + /* Nothing matched. */ + bb_show_usage(); + } + + /* Create a socket to the INET6 kernel. */ + if ((skfd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { + bb_perror_msg_and_die("socket"); + } + + 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) { + bb_perror_msg_and_die("SIOGIFINDEX"); + } + rt.rtmsg_ifindex = ifr.ifr_ifindex; + } + /* Tell the kernel to accept this route. */ - if (action == RTACTION_DEL) { - if (ioctl(skfd, SIOCDELRT, &rt) < 0) { - perror("SIOCDELRT"); - close(skfd); - return (E_SOCK); + if (ioctl(skfd, ((action==RTACTION_ADD) ? SIOCADDRT : SIOCDELRT), &rt)<0) { + bb_perror_msg_and_die("SIOC[ADD|DEL]RT"); + } + + /* Don't bother closing, as we're exiting after we return anyway. */ + /* close(skfd); */ +} +#endif + +static const unsigned int flagvals[] = { /* Must agree with flagchars[]. */ + RTF_GATEWAY, + RTF_HOST, + RTF_REINSTATE, + RTF_DYNAMIC, + RTF_MODIFIED, +#ifdef CONFIG_FEATURE_IPV6 + RTF_DEFAULT, + RTF_ADDRCONF, + RTF_CACHE +#endif +}; + +#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) + +static const char flagchars[] = /* Must agree with flagvals[]. */ + "GHRDM" +#ifdef CONFIG_FEATURE_IPV6 + "DAC" +#endif +; + +static +#ifndef CONFIG_FEATURE_IPV6 +__inline +#endif +void set_flags(char *flagstr, int flags) +{ + int i; + + *flagstr++ = 'U'; + + for (i=0 ; (*flagstr = flagchars[i]) != 0 ; i++) { + if (flags & flagvals[i]) { + ++flagstr; + } + } +} + +void displayroutes(int noresolve, int netstatfmt) +{ + char devname[64], flags[16], sdest[16], sgw[16]; + unsigned long int d, g, m; + int flgs, ref, use, metric, mtu, win, ir; + struct sockaddr_in s_addr; + struct in_addr mask; + + FILE *fp = bb_xfopen("/proc/net/route", "r"); + + bb_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"); } - } else { - if (ioctl(skfd, SIOCADDRT, &rt) < 0) { - perror("SIOCADDRT"); - close(skfd); - return (E_SOCK); + + 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; + INET_rresolve(sdest, sizeof(sdest), &s_addr, + (noresolve | 0x8000), m); /* Default instead of *. */ + + s_addr.sin_addr.s_addr = g; + INET_rresolve(sgw, sizeof(sgw), &s_addr, + (noresolve | 0x4000), m); /* Host instead of net. */ + + mask.s_addr = m; + bb_printf("%-16s%-16s%-16s%-6s", sdest, sgw, inet_ntoa(mask), flags); + if (netstatfmt) { + bb_printf("%5d %-5d %6d %s\n", mtu, win, ir, devname); + } else { + bb_printf("%-6d %-2d %7d %s\n", metric, ref, use, devname); } } - - /* Close the socket. */ - (void) close(skfd); - return (0); } +#ifdef CONFIG_FEATURE_IPV6 + +static void INET6_displayroutes(int noresolve) +{ + char addr6[128], naddr6[128]; + /* 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]; + int iflags, metric, refcnt, use, prefix_len, slen; + struct sockaddr_in6 snaddr6; + + FILE *fp = bb_xfopen("/proc/net/ipv6_route", "r"); + + bb_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"); + } + + /* 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; + } + + 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; + INET6_rresolve(naddr6, sizeof(naddr6), + (struct sockaddr_in6 *) &snaddr6, +#if 0 + (noresolve | 0x8000) /* Default instead of *. */ +#else + 0x0fff /* Apparently, upstream never resolves. */ +#endif + ); + + if (!r) { /* 1st pass */ + snprintf(addr6, sizeof(addr6), "%s/%d", naddr6, prefix_len); + r += 40; + } else { /* 2nd pass */ + /* Print the info. */ + bb_printf("%-43s %-39s %-5s %-6d %-2d %7d %-8s\n", + addr6, naddr6, flags, metric, refcnt, use, iface); + break; + } + } while (1); + } +} + +#endif + +#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. */ +static const char tbl_verb[] = /* 2nd byte matches RTACTION_* code */ + "\006\001add\0" + "\006\002del\0" +/* "\011\002delete\0" */ + "\010\002delete" /* Since last, we can save a byte. */ +; + int route_main(int argc, char **argv) { - int what = 0; - - argc--; - argv++; - - if (*argv == NULL) { - //displayroutes(); - fprintf(stderr, "print routes is not implemented yet\n"); - usage(route_usage); - } else { - /* check verb */ - if (!strcmp(*argv, "add")) - what = RTACTION_ADD; - else if (!strcmp(*argv, "del") || !strcmp(*argv, "delete")) - what = RTACTION_DEL; - else if (!strcmp(*argv, "flush")) - what = RTACTION_FLUSH; + unsigned long opt; + int what; + char *family; + + /* First, remap '-net' and '-host' to avoid getopt problems. */ + { + char **p = argv; + + while (*++p) { + if ((strcmp(*p, "-net") == 0) || (strcmp(*p, "-host") == 0)) { + p[0][0] = '#'; + } + } + } + + opt = bb_getopt_ulflags(argc, argv, "A:ne", &family); + + if ((opt & ROUTE_OPT_A) && strcmp(family, "inet")) { +#ifdef CONFIG_FEATURE_IPV6 + if (strcmp(family, "inet6") == 0) { + opt |= ROUTE_OPT_INET6; /* Set flag for ipv6. */ + } else +#endif + bb_show_usage(); + } + + argv += optind; + + /* No more args means display the routing table. */ + if (!*argv) { + int noresolve = (opt & ROUTE_OPT_n) ? 0x0fff : 0; +#ifdef CONFIG_FEATURE_IPV6 + if (opt & ROUTE_OPT_INET6) + INET6_displayroutes(noresolve); else - usage(route_usage); +#endif + displayroutes(noresolve, opt & ROUTE_OPT_e); + + bb_xferror_stdout(); + bb_fflush_stdout_and_exit(EXIT_SUCCESS); } - INET_setroute(what, 0, ++argv); + /* 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 (opt & ROUTE_OPT_INET6) + INET6_setroute(what, argv); + else +#endif + INET_setroute(what, argv); - exit(0); + return EXIT_SUCCESS; }