X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=networking%2Froute.c;h=32789eecc0dfb4d4a7f26499c983620245dac807;hb=ed4393bdc7a4d3b1b59293a3393eb1d6953bac99;hp=56c6f46c604160746023464c01255d954073bba3;hpb=bb8c7c041c3814ad65897771d9e90d4ad962e197;p=oweals%2Fbusybox.git diff --git a/networking/route.c b/networking/route.c index 56c6f46c6..32789eecc 100644 --- a/networking/route.c +++ b/networking/route.c @@ -10,7 +10,7 @@ * Fred N. van Kempen, * (derived from FvK's 'route.c 1.70 01/04/94') * - * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. + * Licensed under GPLv2 or later, see file LICENSE in this source tree. * * * displayroute() code added by Vladimir N. Oleynik @@ -24,13 +24,31 @@ * Rewritten to fix several bugs, add additional error checking, and * remove ridiculous amounts of bloat. */ +//config:config ROUTE +//config: bool "route (8.9 kb)" +//config: default y +//config: select PLATFORM_LINUX +//config: help +//config: Route displays or manipulates the kernel's IP routing tables. + +//applet:IF_ROUTE(APPLET(route, BB_DIR_SBIN, BB_SUID_DROP)) + +//kbuild:lib-$(CONFIG_ROUTE) += route.o + +//usage:#define route_trivial_usage +//usage: "[{add|del|delete}]" +//usage:#define route_full_usage "\n\n" +//usage: "Edit kernel routing tables\n" +//usage: "\n -n Don't resolve names" +//usage: "\n -e Display other/more information" +//usage: "\n -A inet" IF_FEATURE_IPV6("{6}") " Select address family" -#include "busybox.h" -#include "inet_common.h" -#include #include #include +#include "libbb.h" +#include "inet_common.h" + #ifndef RTF_UP /* Keep this in sync with /usr/src/linux/include/linux/route.h */ @@ -47,9 +65,10 @@ #define RTF_WINDOW 0x0080 /* per route window clamping */ #define RTF_IRTT 0x0100 /* Initial round trip time */ #define RTF_REJECT 0x0200 /* Reject route */ +#define RTF_NONEXTHOP 0x00200000 /* route with no nexthop */ #endif -#if defined (SIOCADDRTOLD) || defined (RTF_IRTT) /* route */ +#if defined(SIOCADDRTOLD) || defined(RTF_IRTT) /* route */ #define HAVE_NEW_ADDRT 1 #endif @@ -72,7 +91,7 @@ #define HOST_FLAG 2 /* We remap '-' to '#' to avoid problems with getopt. */ -static const char tbl_hash_net_host[] = +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. */ @@ -95,7 +114,7 @@ static const char tbl_hash_net_host[] = #define KW_IPVx_DYN 042 #define KW_IPVx_REINSTATE 043 -static const char tbl_ipvx[] = +static const char tbl_ipvx[] ALIGN1 = /* 020 is the "takes an arg" bit */ #if HAVE_NEW_ADDRT "\011\020metric\0" @@ -120,7 +139,7 @@ static const char tbl_ipvx[] = "\013\043reinstate" /* Since last, we can save a byte. */ ; -static const int flags_ipvx[] = { /* MUST match tbl_ipvx[] values above. */ +static const uint16_t flags_ipvx[] = { /* MUST match tbl_ipvx[] values above. */ #ifdef RTF_REJECT RTF_REJECT, #endif @@ -151,9 +170,12 @@ static int kw_lookup(const char *kwtbl, char ***pargs) /* Add or delete a route, depending on action. */ -static void INET_setroute(int action, char **args) +static NOINLINE void INET_setroute(int action, char **args) { - struct rtentry rt; + /* char buffer instead of bona-fide struct avoids aliasing warning */ + char rt_buf[sizeof(struct rtentry)]; + struct rtentry *const rt = (void *)rt_buf; + const char *netmask = NULL; int skfd, isnet, xflag; @@ -166,7 +188,7 @@ static void INET_setroute(int action, char **args) } /* Clean out the RTREQ structure. */ - memset(&rt, 0, sizeof(rt)); + memset(rt, 0, sizeof(*rt)); { const char *target = *args++; @@ -174,26 +196,26 @@ static void INET_setroute(int action, char **args) /* recognize x.x.x.x/mask format. */ prefix = strchr(target, '/'); - if(prefix) { + if (prefix) { int prefix_len; prefix_len = xatoul_range(prefix+1, 0, 32); - mask_in_addr(rt) = htonl( ~ (0xffffffffUL >> prefix_len)); + mask_in_addr(*rt) = htonl( ~(0xffffffffUL >> prefix_len)); *prefix = '\0'; #if HAVE_NEW_ADDRT - rt.rt_genmask.sa_family = AF_INET; + rt->rt_genmask.sa_family = AF_INET; #endif } else { /* Default netmask. */ - netmask = bb_str_default; + netmask = "default"; } /* Prefer hostname lookup is -host flag (xflag==1) was given. */ - isnet = INET_resolve(target, (struct sockaddr_in *) &rt.rt_dst, + 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) { + if (prefix) { /* do not destroy prefix for process args */ *prefix = '/'; } @@ -204,20 +226,20 @@ static void INET_setroute(int action, char **args) } /* Fill in the other fields. */ - rt.rt_flags = ((isnet) ? RTF_UP : (RTF_UP | RTF_HOST)); + rt->rt_flags = ((isnet) ? RTF_UP : (RTF_UP | RTF_HOST)); while (*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]; + rt->rt_flags |= flags_ipvx[k & 3]; continue; } #if HAVE_NEW_ADDRT if (k == KW_IPVx_METRIC) { - rt.rt_metric = xatoul(args_m1) + 1; + rt->rt_metric = xatoul(args_m1) + 1; continue; } #endif @@ -225,7 +247,7 @@ static void INET_setroute(int action, char **args) if (k == KW_IPVx_NETMASK) { struct sockaddr mask; - if (mask_in_addr(rt)) { + if (mask_in_addr(*rt)) { bb_show_usage(); } @@ -234,18 +256,18 @@ static void INET_setroute(int action, char **args) if (isnet < 0) { bb_error_msg_and_die("resolving %s", netmask); } - rt.rt_genmask = full_mask(mask); + rt->rt_genmask = full_mask(mask); continue; } if (k == KW_IPVx_GATEWAY) { - if (rt.rt_flags & RTF_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; + (struct sockaddr_in *) &rt->rt_gateway, 1); + rt->rt_flags |= RTF_GATEWAY; if (isnet) { if (isnet < 0) { @@ -257,24 +279,24 @@ static void INET_setroute(int action, char **args) } if (k == KW_IPVx_MSS) { /* Check valid MSS bounds. */ - rt.rt_flags |= RTF_MSS; - rt.rt_mss = xatoul_range(args_m1, 64, 32768); + rt->rt_flags |= RTF_MSS; + rt->rt_mss = xatoul_range(args_m1, 64, 32768); continue; } if (k == KW_IPVx_WINDOW) { /* Check valid window bounds. */ - rt.rt_flags |= RTF_WINDOW; - rt.rt_window = xatoul_range(args_m1, 128, INT_MAX); + rt->rt_flags |= RTF_WINDOW; + rt->rt_window = xatoul_range(args_m1, 128, INT_MAX); continue; } #ifdef RTF_IRTT if (k == KW_IPVx_IRTT) { - rt.rt_flags |= RTF_IRTT; - rt.rt_irtt = xatoul(args_m1); - rt.rt_irtt *= (sysconf(_SC_CLK_TCK) / 100); /* FIXME */ + rt->rt_flags |= RTF_IRTT; + rt->rt_irtt = xatoul(args_m1); + rt->rt_irtt *= (bb_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)) { + if (rt->rt_irtt < 1 || rt->rt_irtt > (120 * HZ)) { bb_error_msg_and_die("bad irtt"); } #endif @@ -283,10 +305,10 @@ static void INET_setroute(int action, char **args) #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))) { + * and doesn't require 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]; + rt->rt_dev = args[-1]; continue; } @@ -295,47 +317,48 @@ static void INET_setroute(int action, char **args) } #ifdef RTF_REJECT - if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev) { - rt.rt_dev = "lo"; + 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); + if (mask_in_addr(*rt)) { + uint32_t mask = mask_in_addr(*rt); mask = ~ntohl(mask); - if ((rt.rt_flags & RTF_HOST) && mask != 0xffffffff) { + if ((rt->rt_flags & RTF_HOST) && mask != 0xffffffff) { bb_error_msg_and_die("netmask %.8x and host route conflict", (unsigned int) mask); } if (mask & (mask + 1)) { 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)) { + mask = ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr; + 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)) { - mask_in_addr(rt) = 0xffffffff; + if ((action == RTACTION_ADD) && (rt->rt_flags & RTF_HOST)) { + mask_in_addr(*rt) = 0xffffffff; } /* Create a socket to the INET kernel. */ skfd = xsocket(AF_INET, SOCK_DGRAM, 0); - if (ioctl(skfd, ((action==RTACTION_ADD) ? SIOCADDRT : SIOCDELRT), &rt)<0) { - bb_perror_msg_and_die("SIOC[ADD|DEL]RT"); - } + if (action == RTACTION_ADD) + xioctl(skfd, SIOCADDRT, rt); + else + xioctl(skfd, SIOCDELRT, rt); if (ENABLE_FEATURE_CLEAN_UP) close(skfd); } #if ENABLE_FEATURE_IPV6 -static void INET6_setroute(int action, char **args) +static NOINLINE void INET6_setroute(int action, char **args) { struct sockaddr_in6 sa6; struct in6_rtmsg rt; @@ -345,14 +368,15 @@ static void INET6_setroute(int action, char **args) /* We know args isn't NULL from the check in route_main. */ const char *target = *args++; - if (strcmp(target, bb_str_default) == 0) { + 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 = xatoul_range(cp+1, 0, 128); + 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; } @@ -396,13 +420,13 @@ static void INET6_setroute(int action, char **args) bb_error_msg_and_die("resolving %s", args_m1); } memcpy(&rt.rtmsg_gateway, sa6.sin6_addr.s6_addr, - sizeof(struct in6_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. */ + * and doesn't require 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]; @@ -421,24 +445,26 @@ static void INET6_setroute(int action, char **args) if (devname) { struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); - strncpy(ifr.ifr_name, devname, sizeof(ifr.ifr_name)); - - if (ioctl(skfd, SIOGIFINDEX, &ifr) < 0) { - bb_perror_msg_and_die("SIOGIFINDEX"); - } + strncpy_IFNAMSIZ(ifr.ifr_name, devname); + xioctl(skfd, SIOCGIFINDEX, &ifr); rt.rtmsg_ifindex = ifr.ifr_ifindex; } /* Tell the kernel to accept this route. */ - if (ioctl(skfd, ((action==RTACTION_ADD) ? SIOCADDRT : SIOCDELRT), &rt)<0) { - bb_perror_msg_and_die("SIOC[ADD|DEL]RT"); - } + if (action == RTACTION_ADD) + xioctl(skfd, SIOCADDRT, &rt); + else + xioctl(skfd, SIOCDELRT, &rt); if (ENABLE_FEATURE_CLEAN_UP) close(skfd); } #endif -static const unsigned int flagvals[] = { /* Must agree with flagchars[]. */ +static const +IF_NOT_FEATURE_IPV6(uint16_t) +IF_FEATURE_IPV6(unsigned) +flagvals[] = { /* Must agree with flagchars[]. */ + RTF_UP, RTF_GATEWAY, RTF_HOST, RTF_REINSTATE, @@ -447,26 +473,25 @@ static const unsigned int flagvals[] = { /* Must agree with flagchars[]. */ #if ENABLE_FEATURE_IPV6 RTF_DEFAULT, RTF_ADDRCONF, - RTF_CACHE + RTF_CACHE, + RTF_REJECT, + RTF_NONEXTHOP, /* this one doesn't fit into 16 bits */ #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" +/* Must agree with flagvals[]. */ +static const char flagchars[] ALIGN1 = + "UGHRDM" #if ENABLE_FEATURE_IPV6 - "DAC" + "DAC!n" #endif ; +#define IPV4_MASK (RTF_UP|RTF_GATEWAY|RTF_HOST|RTF_REINSTATE|RTF_DYNAMIC|RTF_MODIFIED) +#define IPV6_MASK (RTF_UP|RTF_GATEWAY|RTF_HOST|RTF_DEFAULT|RTF_ADDRCONF|RTF_CACHE|RTF_REJECT|RTF_NONEXTHOP) static void set_flags(char *flagstr, int flags) { int i; - *flagstr++ = 'U'; - for (i = 0; (*flagstr = flagchars[i]) != 0; i++) { if (flags & flagvals[i]) { ++flagstr; @@ -475,34 +500,39 @@ static void set_flags(char *flagstr, int flags) } /* also used in netstat */ -void bb_displayroutes(int noresolve, int netstatfmt) +void FAST_FUNC bb_displayroutes(int noresolve, int netstatfmt) { - char devname[64], flags[16], sdest[16], sgw[16]; - unsigned long int d, g, m; + char devname[64], flags[16], *sdest, *sgw; + unsigned long d, g, m; + int r; int flgs, ref, use, metric, mtu, win, ir; struct sockaddr_in s_addr; struct in_addr mask; - FILE *fp = xfopen("/proc/net/route", "r"); + FILE *fp = xfopen_for_read("/proc/net/route"); printf("Kernel IP routing table\n" - "Destination Gateway Genmask Flags %s Iface\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. */ + /* Skip the first line. */ + r = fscanf(fp, "%*[^\n]\n"); + if (r < 0) { + /* Empty line, read error, or EOF. Yes, if routing table + * is completely empty, /proc/net/route has no header. + */ + goto 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); + devname, &d, &g, &flgs, &ref, &use, &metric, &m, + &mtu, &win, &ir); if (r != 11) { + ERROR: if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */ break; } - ERROR: - bb_error_msg_and_die("fscanf"); + bb_perror_msg_and_die(bb_msg_read_error); } if (!(flgs & RTF_UP)) { /* Skip interfaces that are down. */ @@ -519,28 +549,28 @@ void bb_displayroutes(int noresolve, int netstatfmt) 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 *. */ - + sdest = INET_rresolve(&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. */ - + sgw = INET_rresolve(&s_addr, (noresolve | 0x4000), m); /* Host instead of net */ mask.s_addr = m; - printf("%-16s%-16s%-16s%-6s", sdest, sgw, inet_ntoa(mask), flags); + /* "%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); } } + fclose(fp); } #if ENABLE_FEATURE_IPV6 -static void INET6_displayroutes(int noresolve) +static void INET6_displayroutes(void) { - char addr6[128], naddr6[128]; + 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 @@ -552,23 +582,23 @@ static void INET6_displayroutes(int noresolve) int iflags, metric, refcnt, use, prefix_len, slen; struct sockaddr_in6 snaddr6; - FILE *fp = xfopen("/proc/net/ipv6_route", "r"); + 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"); + "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); + addr6x+14, &prefix_len, &slen, addr6x+40+7, + &metric, &refcnt, &use, &iflags, iface); if (r != 9) { if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */ break; } ERROR: - bb_error_msg_and_die("fscanf"); + bb_perror_msg_and_die(bb_msg_read_error); } /* Do the addr6x shift-and-insert changes to ':'-delimit addresses. @@ -580,7 +610,7 @@ static void INET6_displayroutes(int noresolve) do { if (!*p) { - if (i==40) { /* nul terminator for 1st address? */ + if (i == 40) { /* nul terminator for 1st address? */ addr6x[39] = 0; /* Fixup... need 0 instead of ':'. */ ++p; /* Skip and continue. */ continue; @@ -594,33 +624,31 @@ static void INET6_displayroutes(int noresolve) } while (i < 40+28+7); } - if (!(iflags & RTF_UP)) { /* Skip interfaces that are down. */ - continue; - } - set_flags(flags, (iflags & IPV6_MASK)); r = 0; - do { + while (1) { 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, - 0x0fff /* Apparently, upstream never resolves. */ - ); + 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); + addr6, naddr6, flags, metric, refcnt, use, iface); + free(naddr6); break; } - } while (1); + } } + fclose(fp); } #endif @@ -631,14 +659,16 @@ static void INET6_displayroutes(int noresolve) #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 */ +/* 2nd byte matches RTACTION_* code */ +static const char tbl_verb[] ALIGN1 = "\006\001add\0" "\006\002del\0" /* "\011\002delete\0" */ - "\010\002delete" /* Since last, we can save a byte. */ + "\010\002delete" /* Since it's last, we can save a byte. */ ; -int route_main(int argc, char **argv) +int route_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int route_main(int argc UNUSED_PARAM, char **argv) { unsigned opt; int what; @@ -653,7 +683,7 @@ int route_main(int argc, char **argv) } } - opt = getopt32(argc, argv, "A:ne", &family); + opt = getopt32(argv, "A:ne", &family); if ((opt & ROUTE_OPT_A) && strcmp(family, "inet") != 0) { #if ENABLE_FEATURE_IPV6 @@ -671,7 +701,7 @@ int route_main(int argc, char **argv) int noresolve = (opt & ROUTE_OPT_n) ? 0x0fff : 0; #if ENABLE_FEATURE_IPV6 if (opt & ROUTE_OPT_INET6) - INET6_displayroutes(noresolve); + INET6_displayroutes(); else #endif bb_displayroutes(noresolve, opt & ROUTE_OPT_e);