[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /* route
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| 3 | *
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| 4 | * Similar to the standard Unix route, but with only the necessary
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| 5 | * parts for AF_INET and AF_INET6
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| 6 | *
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| 7 | * Bjorn Wesen, Axis Communications AB
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| 8 | *
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| 9 | * Author of the original route:
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| 10 | * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
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| 11 | * (derived from FvK's 'route.c 1.70 01/04/94')
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| 12 | *
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| 13 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 14 | *
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| 15 | *
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| 16 | * displayroute() code added by Vladimir N. Oleynik <dzo@simtreas.ru>
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| 17 | * adjustments by Larry Doolittle <LRDoolittle@lbl.gov>
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| 18 | *
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| 19 | * IPV6 support added by Bart Visscher <magick@linux-fan.com>
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| 20 | */
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| 21 |
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| 22 | /* 2004/03/09 Manuel Novoa III <mjn3@codepoet.org>
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| 23 | *
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| 24 | * Rewritten to fix several bugs, add additional error checking, and
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| 25 | * remove ridiculous amounts of bloat.
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| 26 | */
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| 27 |
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| 28 | #include <net/route.h>
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| 29 | #include <net/if.h>
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| 30 |
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| 31 | #include "libbb.h"
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| 32 | #include "inet_common.h"
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| 33 |
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| 34 |
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| 35 | #ifndef RTF_UP
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| 36 | /* Keep this in sync with /usr/src/linux/include/linux/route.h */
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| 37 | #define RTF_UP 0x0001 /* route usable */
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| 38 | #define RTF_GATEWAY 0x0002 /* destination is a gateway */
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| 39 | #define RTF_HOST 0x0004 /* host entry (net otherwise) */
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| 40 | #define RTF_REINSTATE 0x0008 /* reinstate route after tmout */
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| 41 | #define RTF_DYNAMIC 0x0010 /* created dyn. (by redirect) */
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| 42 | #define RTF_MODIFIED 0x0020 /* modified dyn. (by redirect) */
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| 43 | #define RTF_MTU 0x0040 /* specific MTU for this route */
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| 44 | #ifndef RTF_MSS
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| 45 | #define RTF_MSS RTF_MTU /* Compatibility :-( */
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| 46 | #endif
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| 47 | #define RTF_WINDOW 0x0080 /* per route window clamping */
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| 48 | #define RTF_IRTT 0x0100 /* Initial round trip time */
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| 49 | #define RTF_REJECT 0x0200 /* Reject route */
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| 50 | #endif
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| 51 |
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| 52 | #if defined(SIOCADDRTOLD) || defined(RTF_IRTT) /* route */
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| 53 | #define HAVE_NEW_ADDRT 1
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| 54 | #endif
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| 55 |
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| 56 | #if HAVE_NEW_ADDRT
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| 57 | #define mask_in_addr(x) (((struct sockaddr_in *)&((x).rt_genmask))->sin_addr.s_addr)
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| 58 | #define full_mask(x) (x)
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| 59 | #else
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| 60 | #define mask_in_addr(x) ((x).rt_genmask)
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| 61 | #define full_mask(x) (((struct sockaddr_in *)&(x))->sin_addr.s_addr)
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| 62 | #endif
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| 63 |
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| 64 | /* The RTACTION entries must agree with tbl_verb[] below! */
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| 65 | #define RTACTION_ADD 1
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| 66 | #define RTACTION_DEL 2
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| 67 |
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| 68 | /* For the various tbl_*[] arrays, the 1st byte is the offset to
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| 69 | * the next entry and the 2nd byte is return value. */
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| 70 |
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| 71 | #define NET_FLAG 1
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| 72 | #define HOST_FLAG 2
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| 73 |
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| 74 | /* We remap '-' to '#' to avoid problems with getopt. */
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| 75 | static const char tbl_hash_net_host[] ALIGN1 =
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| 76 | "\007\001#net\0"
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| 77 | /* "\010\002#host\0" */
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| 78 | "\007\002#host" /* Since last, we can save a byte. */
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| 79 | ;
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| 80 |
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| 81 | #define KW_TAKES_ARG 020
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| 82 | #define KW_SETS_FLAG 040
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| 83 |
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| 84 | #define KW_IPVx_METRIC 020
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| 85 | #define KW_IPVx_NETMASK 021
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| 86 | #define KW_IPVx_GATEWAY 022
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| 87 | #define KW_IPVx_MSS 023
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| 88 | #define KW_IPVx_WINDOW 024
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| 89 | #define KW_IPVx_IRTT 025
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| 90 | #define KW_IPVx_DEVICE 026
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| 91 |
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| 92 | #define KW_IPVx_FLAG_ONLY 040
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| 93 | #define KW_IPVx_REJECT 040
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| 94 | #define KW_IPVx_MOD 041
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| 95 | #define KW_IPVx_DYN 042
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| 96 | #define KW_IPVx_REINSTATE 043
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| 97 |
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| 98 | static const char tbl_ipvx[] ALIGN1 =
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| 99 | /* 020 is the "takes an arg" bit */
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| 100 | #if HAVE_NEW_ADDRT
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| 101 | "\011\020metric\0"
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| 102 | #endif
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| 103 | "\012\021netmask\0"
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| 104 | "\005\022gw\0"
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| 105 | "\012\022gateway\0"
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| 106 | "\006\023mss\0"
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| 107 | "\011\024window\0"
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| 108 | #ifdef RTF_IRTT
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| 109 | "\007\025irtt\0"
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| 110 | #endif
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| 111 | "\006\026dev\0"
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| 112 | "\011\026device\0"
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| 113 | /* 040 is the "sets a flag" bit - MUST match flags_ipvx[] values below. */
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| 114 | #ifdef RTF_REJECT
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| 115 | "\011\040reject\0"
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| 116 | #endif
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| 117 | "\006\041mod\0"
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| 118 | "\006\042dyn\0"
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| 119 | /* "\014\043reinstate\0" */
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| 120 | "\013\043reinstate" /* Since last, we can save a byte. */
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| 121 | ;
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| 122 |
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| 123 | static const int flags_ipvx[] = { /* MUST match tbl_ipvx[] values above. */
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| 124 | #ifdef RTF_REJECT
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| 125 | RTF_REJECT,
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| 126 | #endif
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| 127 | RTF_MODIFIED,
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| 128 | RTF_DYNAMIC,
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| 129 | RTF_REINSTATE
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| 130 | };
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| 131 |
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| 132 | static int kw_lookup(const char *kwtbl, char ***pargs)
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| 133 | {
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| 134 | if (**pargs) {
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| 135 | do {
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| 136 | if (strcmp(kwtbl+2, **pargs) == 0) { /* Found a match. */
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| 137 | *pargs += 1;
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| 138 | if (kwtbl[1] & KW_TAKES_ARG) {
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| 139 | if (!**pargs) { /* No more args! */
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| 140 | bb_show_usage();
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| 141 | }
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| 142 | *pargs += 1; /* Calling routine will use args[-1]. */
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| 143 | }
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| 144 | return kwtbl[1];
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| 145 | }
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| 146 | kwtbl += *kwtbl;
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| 147 | } while (*kwtbl);
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| 148 | }
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| 149 | return 0;
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| 150 | }
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| 151 |
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| 152 | /* Add or delete a route, depending on action. */
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| 153 |
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| 154 | static NOINLINE void INET_setroute(int action, char **args)
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| 155 | {
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| 156 | struct rtentry rt;
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| 157 | const char *netmask = NULL;
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| 158 | int skfd, isnet, xflag;
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| 159 |
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| 160 | /* Grab the -net or -host options. Remember they were transformed. */
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| 161 | xflag = kw_lookup(tbl_hash_net_host, &args);
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| 162 |
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| 163 | /* If we did grab -net or -host, make sure we still have an arg left. */
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| 164 | if (*args == NULL) {
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| 165 | bb_show_usage();
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| 166 | }
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| 167 |
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| 168 | /* Clean out the RTREQ structure. */
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| 169 | memset(&rt, 0, sizeof(rt));
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| 170 |
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| 171 | {
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| 172 | const char *target = *args++;
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| 173 | char *prefix;
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| 174 |
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| 175 | /* recognize x.x.x.x/mask format. */
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| 176 | prefix = strchr(target, '/');
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| 177 | if (prefix) {
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| 178 | int prefix_len;
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| 179 |
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| 180 | prefix_len = xatoul_range(prefix+1, 0, 32);
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| 181 | mask_in_addr(rt) = htonl( ~(0xffffffffUL >> prefix_len));
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| 182 | *prefix = '\0';
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| 183 | #if HAVE_NEW_ADDRT
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| 184 | rt.rt_genmask.sa_family = AF_INET;
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| 185 | #endif
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| 186 | } else {
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| 187 | /* Default netmask. */
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| 188 | netmask = "default";
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| 189 | }
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| 190 | /* Prefer hostname lookup is -host flag (xflag==1) was given. */
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| 191 | isnet = INET_resolve(target, (struct sockaddr_in *) &rt.rt_dst,
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| 192 | (xflag & HOST_FLAG));
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| 193 | if (isnet < 0) {
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| 194 | bb_error_msg_and_die("resolving %s", target);
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| 195 | }
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| 196 | if (prefix) {
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| 197 | /* do not destroy prefix for process args */
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| 198 | *prefix = '/';
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| 199 | }
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| 200 | }
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| 201 |
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| 202 | if (xflag) { /* Reinit isnet if -net or -host was specified. */
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| 203 | isnet = (xflag & NET_FLAG);
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| 204 | }
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| 205 |
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| 206 | /* Fill in the other fields. */
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| 207 | rt.rt_flags = ((isnet) ? RTF_UP : (RTF_UP | RTF_HOST));
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| 208 |
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| 209 | while (*args) {
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| 210 | int k = kw_lookup(tbl_ipvx, &args);
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| 211 | const char *args_m1 = args[-1];
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| 212 |
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| 213 | if (k & KW_IPVx_FLAG_ONLY) {
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| 214 | rt.rt_flags |= flags_ipvx[k & 3];
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| 215 | continue;
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| 216 | }
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| 217 |
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| 218 | #if HAVE_NEW_ADDRT
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| 219 | if (k == KW_IPVx_METRIC) {
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| 220 | rt.rt_metric = xatoul(args_m1) + 1;
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| 221 | continue;
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| 222 | }
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| 223 | #endif
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| 224 |
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| 225 | if (k == KW_IPVx_NETMASK) {
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| 226 | struct sockaddr mask;
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| 227 |
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| 228 | if (mask_in_addr(rt)) {
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| 229 | bb_show_usage();
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| 230 | }
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| 231 |
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| 232 | netmask = args_m1;
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| 233 | isnet = INET_resolve(netmask, (struct sockaddr_in *) &mask, 0);
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| 234 | if (isnet < 0) {
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| 235 | bb_error_msg_and_die("resolving %s", netmask);
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| 236 | }
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| 237 | rt.rt_genmask = full_mask(mask);
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| 238 | continue;
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| 239 | }
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| 240 |
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| 241 | if (k == KW_IPVx_GATEWAY) {
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| 242 | if (rt.rt_flags & RTF_GATEWAY) {
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| 243 | bb_show_usage();
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| 244 | }
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| 245 |
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| 246 | isnet = INET_resolve(args_m1,
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| 247 | (struct sockaddr_in *) &rt.rt_gateway, 1);
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| 248 | rt.rt_flags |= RTF_GATEWAY;
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| 249 |
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| 250 | if (isnet) {
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| 251 | if (isnet < 0) {
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| 252 | bb_error_msg_and_die("resolving %s", args_m1);
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| 253 | }
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| 254 | bb_error_msg_and_die("gateway %s is a NETWORK", args_m1);
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| 255 | }
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| 256 | continue;
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| 257 | }
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| 258 |
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| 259 | if (k == KW_IPVx_MSS) { /* Check valid MSS bounds. */
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| 260 | rt.rt_flags |= RTF_MSS;
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| 261 | rt.rt_mss = xatoul_range(args_m1, 64, 32768);
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| 262 | continue;
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| 263 | }
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| 264 |
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| 265 | if (k == KW_IPVx_WINDOW) { /* Check valid window bounds. */
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| 266 | rt.rt_flags |= RTF_WINDOW;
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| 267 | rt.rt_window = xatoul_range(args_m1, 128, INT_MAX);
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| 268 | continue;
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| 269 | }
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| 270 |
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| 271 | #ifdef RTF_IRTT
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| 272 | if (k == KW_IPVx_IRTT) {
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| 273 | rt.rt_flags |= RTF_IRTT;
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| 274 | rt.rt_irtt = xatoul(args_m1);
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| 275 | rt.rt_irtt *= (sysconf(_SC_CLK_TCK) / 100); /* FIXME */
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| 276 | #if 0 /* FIXME: do we need to check anything of this? */
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| 277 | if (rt.rt_irtt < 1 || rt.rt_irtt > (120 * HZ)) {
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| 278 | bb_error_msg_and_die("bad irtt");
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| 279 | }
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| 280 | #endif
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| 281 | continue;
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| 282 | }
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| 283 | #endif
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| 284 |
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| 285 | /* Device is special in that it can be the last arg specified
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| 286 | * and doesn't requre the dev/device keyword in that case. */
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| 287 | if (!rt.rt_dev && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) {
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| 288 | /* Don't use args_m1 here since args may have changed! */
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| 289 | rt.rt_dev = args[-1];
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| 290 | continue;
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| 291 | }
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| 292 |
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| 293 | /* Nothing matched. */
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| 294 | bb_show_usage();
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| 295 | }
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| 296 |
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| 297 | #ifdef RTF_REJECT
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| 298 | if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev) {
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| 299 | rt.rt_dev = (char*)"lo";
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| 300 | }
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| 301 | #endif
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| 302 |
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| 303 | /* sanity checks.. */
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| 304 | if (mask_in_addr(rt)) {
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| 305 | uint32_t mask = mask_in_addr(rt);
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| 306 |
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| 307 | mask = ~ntohl(mask);
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| 308 | if ((rt.rt_flags & RTF_HOST) && mask != 0xffffffff) {
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| 309 | bb_error_msg_and_die("netmask %.8x and host route conflict",
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| 310 | (unsigned int) mask);
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| 311 | }
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| 312 | if (mask & (mask + 1)) {
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| 313 | bb_error_msg_and_die("bogus netmask %s", netmask);
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| 314 | }
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| 315 | mask = ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr;
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| 316 | if (mask & ~(uint32_t)mask_in_addr(rt)) {
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| 317 | bb_error_msg_and_die("netmask and route address conflict");
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| 318 | }
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| 319 | }
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| 320 |
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| 321 | /* Fill out netmask if still unset */
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| 322 | if ((action == RTACTION_ADD) && (rt.rt_flags & RTF_HOST)) {
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| 323 | mask_in_addr(rt) = 0xffffffff;
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| 324 | }
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| 325 |
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| 326 | /* Create a socket to the INET kernel. */
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| 327 | skfd = xsocket(AF_INET, SOCK_DGRAM, 0);
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| 328 |
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| 329 | if (action == RTACTION_ADD)
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| 330 | xioctl(skfd, SIOCADDRT, &rt);
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| 331 | else
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| 332 | xioctl(skfd, SIOCDELRT, &rt);
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| 333 |
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| 334 | if (ENABLE_FEATURE_CLEAN_UP) close(skfd);
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| 335 | }
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| 336 |
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| 337 | #if ENABLE_FEATURE_IPV6
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| 338 |
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| 339 | static NOINLINE void INET6_setroute(int action, char **args)
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| 340 | {
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| 341 | struct sockaddr_in6 sa6;
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| 342 | struct in6_rtmsg rt;
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| 343 | int prefix_len, skfd;
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| 344 | const char *devname;
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| 345 |
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| 346 | /* We know args isn't NULL from the check in route_main. */
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| 347 | const char *target = *args++;
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| 348 |
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| 349 | if (strcmp(target, "default") == 0) {
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| 350 | prefix_len = 0;
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| 351 | memset(&sa6, 0, sizeof(sa6));
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| 352 | } else {
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| 353 | char *cp;
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| 354 | cp = strchr(target, '/'); /* Yes... const to non is ok. */
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| 355 | if (cp) {
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| 356 | *cp = '\0';
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| 357 | prefix_len = xatoul_range(cp + 1, 0, 128);
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| 358 | } else {
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| 359 | prefix_len = 128;
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| 360 | }
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| 361 | if (INET6_resolve(target, (struct sockaddr_in6 *) &sa6) < 0) {
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| 362 | bb_error_msg_and_die("resolving %s", target);
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| 363 | }
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| 364 | }
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| 365 |
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| 366 | /* Clean out the RTREQ structure. */
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| 367 | memset(&rt, 0, sizeof(rt));
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| 368 |
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| 369 | memcpy(&rt.rtmsg_dst, sa6.sin6_addr.s6_addr, sizeof(struct in6_addr));
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| 370 |
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| 371 | /* Fill in the other fields. */
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| 372 | rt.rtmsg_dst_len = prefix_len;
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| 373 | rt.rtmsg_flags = ((prefix_len == 128) ? (RTF_UP|RTF_HOST) : RTF_UP);
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| 374 | rt.rtmsg_metric = 1;
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| 375 |
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| 376 | devname = NULL;
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| 377 |
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| 378 | while (*args) {
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| 379 | int k = kw_lookup(tbl_ipvx, &args);
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| 380 | const char *args_m1 = args[-1];
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| 381 |
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| 382 | if ((k == KW_IPVx_MOD) || (k == KW_IPVx_DYN)) {
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| 383 | rt.rtmsg_flags |= flags_ipvx[k & 3];
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| 384 | continue;
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| 385 | }
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| 386 |
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| 387 | if (k == KW_IPVx_METRIC) {
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| 388 | rt.rtmsg_metric = xatoul(args_m1);
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| 389 | continue;
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| 390 | }
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| 391 |
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| 392 | if (k == KW_IPVx_GATEWAY) {
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| 393 | if (rt.rtmsg_flags & RTF_GATEWAY) {
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| 394 | bb_show_usage();
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| 395 | }
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| 396 |
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| 397 | if (INET6_resolve(args_m1, (struct sockaddr_in6 *) &sa6) < 0) {
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| 398 | bb_error_msg_and_die("resolving %s", args_m1);
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| 399 | }
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| 400 | memcpy(&rt.rtmsg_gateway, sa6.sin6_addr.s6_addr,
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| 401 | sizeof(struct in6_addr));
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| 402 | rt.rtmsg_flags |= RTF_GATEWAY;
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| 403 | continue;
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| 404 | }
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| 405 |
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| 406 | /* Device is special in that it can be the last arg specified
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| 407 | * and doesn't requre the dev/device keyword in that case. */
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| 408 | if (!devname && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) {
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| 409 | /* Don't use args_m1 here since args may have changed! */
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| 410 | devname = args[-1];
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| 411 | continue;
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| 412 | }
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| 413 |
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| 414 | /* Nothing matched. */
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| 415 | bb_show_usage();
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| 416 | }
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| 417 |
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| 418 | /* Create a socket to the INET6 kernel. */
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| 419 | skfd = xsocket(AF_INET6, SOCK_DGRAM, 0);
|
---|
| 420 |
|
---|
| 421 | rt.rtmsg_ifindex = 0;
|
---|
| 422 |
|
---|
| 423 | if (devname) {
|
---|
| 424 | struct ifreq ifr;
|
---|
| 425 | memset(&ifr, 0, sizeof(ifr));
|
---|
| 426 | strncpy_IFNAMSIZ(ifr.ifr_name, devname);
|
---|
| 427 | xioctl(skfd, SIOGIFINDEX, &ifr);
|
---|
| 428 | rt.rtmsg_ifindex = ifr.ifr_ifindex;
|
---|
| 429 | }
|
---|
| 430 |
|
---|
| 431 | /* Tell the kernel to accept this route. */
|
---|
| 432 | if (action == RTACTION_ADD)
|
---|
| 433 | xioctl(skfd, SIOCADDRT, &rt);
|
---|
| 434 | else
|
---|
| 435 | xioctl(skfd, SIOCDELRT, &rt);
|
---|
| 436 |
|
---|
| 437 | if (ENABLE_FEATURE_CLEAN_UP) close(skfd);
|
---|
| 438 | }
|
---|
| 439 | #endif
|
---|
| 440 |
|
---|
| 441 | static const unsigned flagvals[] = { /* Must agree with flagchars[]. */
|
---|
| 442 | RTF_GATEWAY,
|
---|
| 443 | RTF_HOST,
|
---|
| 444 | RTF_REINSTATE,
|
---|
| 445 | RTF_DYNAMIC,
|
---|
| 446 | RTF_MODIFIED,
|
---|
| 447 | #if ENABLE_FEATURE_IPV6
|
---|
| 448 | RTF_DEFAULT,
|
---|
| 449 | RTF_ADDRCONF,
|
---|
| 450 | RTF_CACHE
|
---|
| 451 | #endif
|
---|
| 452 | };
|
---|
| 453 |
|
---|
| 454 | #define IPV4_MASK (RTF_GATEWAY|RTF_HOST|RTF_REINSTATE|RTF_DYNAMIC|RTF_MODIFIED)
|
---|
| 455 | #define IPV6_MASK (RTF_GATEWAY|RTF_HOST|RTF_DEFAULT|RTF_ADDRCONF|RTF_CACHE)
|
---|
| 456 |
|
---|
| 457 | /* Must agree with flagvals[]. */
|
---|
| 458 | static const char flagchars[] ALIGN1 =
|
---|
| 459 | "GHRDM"
|
---|
| 460 | #if ENABLE_FEATURE_IPV6
|
---|
| 461 | "DAC"
|
---|
| 462 | #endif
|
---|
| 463 | ;
|
---|
| 464 |
|
---|
| 465 | static void set_flags(char *flagstr, int flags)
|
---|
| 466 | {
|
---|
| 467 | int i;
|
---|
| 468 |
|
---|
| 469 | *flagstr++ = 'U';
|
---|
| 470 |
|
---|
| 471 | for (i = 0; (*flagstr = flagchars[i]) != 0; i++) {
|
---|
| 472 | if (flags & flagvals[i]) {
|
---|
| 473 | ++flagstr;
|
---|
| 474 | }
|
---|
| 475 | }
|
---|
| 476 | }
|
---|
| 477 |
|
---|
| 478 | /* also used in netstat */
|
---|
| 479 | void FAST_FUNC bb_displayroutes(int noresolve, int netstatfmt)
|
---|
| 480 | {
|
---|
| 481 | char devname[64], flags[16], *sdest, *sgw;
|
---|
| 482 | unsigned long d, g, m;
|
---|
| 483 | int flgs, ref, use, metric, mtu, win, ir;
|
---|
| 484 | struct sockaddr_in s_addr;
|
---|
| 485 | struct in_addr mask;
|
---|
| 486 |
|
---|
| 487 | FILE *fp = xfopen_for_read("/proc/net/route");
|
---|
| 488 |
|
---|
| 489 | printf("Kernel IP routing table\n"
|
---|
| 490 | "Destination Gateway Genmask Flags %s Iface\n",
|
---|
| 491 | netstatfmt ? " MSS Window irtt" : "Metric Ref Use");
|
---|
| 492 |
|
---|
| 493 | if (fscanf(fp, "%*[^\n]\n") < 0) { /* Skip the first line. */
|
---|
| 494 | goto ERROR; /* Empty or missing line, or read error. */
|
---|
| 495 | }
|
---|
| 496 | while (1) {
|
---|
| 497 | int r;
|
---|
| 498 | r = fscanf(fp, "%63s%lx%lx%X%d%d%d%lx%d%d%d\n",
|
---|
| 499 | devname, &d, &g, &flgs, &ref, &use, &metric, &m,
|
---|
| 500 | &mtu, &win, &ir);
|
---|
| 501 | if (r != 11) {
|
---|
| 502 | if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */
|
---|
| 503 | break;
|
---|
| 504 | }
|
---|
| 505 | ERROR:
|
---|
| 506 | bb_error_msg_and_die("fscanf");
|
---|
| 507 | }
|
---|
| 508 |
|
---|
| 509 | if (!(flgs & RTF_UP)) { /* Skip interfaces that are down. */
|
---|
| 510 | continue;
|
---|
| 511 | }
|
---|
| 512 |
|
---|
| 513 | set_flags(flags, (flgs & IPV4_MASK));
|
---|
| 514 | #ifdef RTF_REJECT
|
---|
| 515 | if (flgs & RTF_REJECT) {
|
---|
| 516 | flags[0] = '!';
|
---|
| 517 | }
|
---|
| 518 | #endif
|
---|
| 519 |
|
---|
| 520 | memset(&s_addr, 0, sizeof(struct sockaddr_in));
|
---|
| 521 | s_addr.sin_family = AF_INET;
|
---|
| 522 | s_addr.sin_addr.s_addr = d;
|
---|
| 523 | sdest = INET_rresolve(&s_addr, (noresolve | 0x8000), m); /* 'default' instead of '*' */
|
---|
| 524 | s_addr.sin_addr.s_addr = g;
|
---|
| 525 | sgw = INET_rresolve(&s_addr, (noresolve | 0x4000), m); /* Host instead of net */
|
---|
| 526 | mask.s_addr = m;
|
---|
| 527 | /* "%15.15s" truncates hostnames, do we really want that? */
|
---|
| 528 | printf("%-15.15s %-15.15s %-16s%-6s", sdest, sgw, inet_ntoa(mask), flags);
|
---|
| 529 | free(sdest);
|
---|
| 530 | free(sgw);
|
---|
| 531 | if (netstatfmt) {
|
---|
| 532 | printf("%5d %-5d %6d %s\n", mtu, win, ir, devname);
|
---|
| 533 | } else {
|
---|
| 534 | printf("%-6d %-2d %7d %s\n", metric, ref, use, devname);
|
---|
| 535 | }
|
---|
| 536 | }
|
---|
| 537 | }
|
---|
| 538 |
|
---|
| 539 | #if ENABLE_FEATURE_IPV6
|
---|
| 540 |
|
---|
| 541 | static void INET6_displayroutes(void)
|
---|
| 542 | {
|
---|
| 543 | char addr6[128], *naddr6;
|
---|
| 544 | /* In addr6x, we store both 40-byte ':'-delimited ipv6 addresses.
|
---|
| 545 | * We read the non-delimited strings into the tail of the buffer
|
---|
| 546 | * using fscanf and then modify the buffer by shifting forward
|
---|
| 547 | * while inserting ':'s and the nul terminator for the first string.
|
---|
| 548 | * Hence the strings are at addr6x and addr6x+40. This generates
|
---|
| 549 | * _much_ less code than the previous (upstream) approach. */
|
---|
| 550 | char addr6x[80];
|
---|
| 551 | char iface[16], flags[16];
|
---|
| 552 | int iflags, metric, refcnt, use, prefix_len, slen;
|
---|
| 553 | struct sockaddr_in6 snaddr6;
|
---|
| 554 |
|
---|
| 555 | FILE *fp = xfopen_for_read("/proc/net/ipv6_route");
|
---|
| 556 |
|
---|
| 557 | printf("Kernel IPv6 routing table\n%-44s%-40s"
|
---|
| 558 | "Flags Metric Ref Use Iface\n",
|
---|
| 559 | "Destination", "Next Hop");
|
---|
| 560 |
|
---|
| 561 | while (1) {
|
---|
| 562 | int r;
|
---|
| 563 | r = fscanf(fp, "%32s%x%*s%x%32s%x%x%x%x%s\n",
|
---|
| 564 | addr6x+14, &prefix_len, &slen, addr6x+40+7,
|
---|
| 565 | &metric, &use, &refcnt, &iflags, iface);
|
---|
| 566 | if (r != 9) {
|
---|
| 567 | if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */
|
---|
| 568 | break;
|
---|
| 569 | }
|
---|
| 570 | ERROR:
|
---|
| 571 | bb_error_msg_and_die("fscanf");
|
---|
| 572 | }
|
---|
| 573 |
|
---|
| 574 | /* Do the addr6x shift-and-insert changes to ':'-delimit addresses.
|
---|
| 575 | * For now, always do this to validate the proc route format, even
|
---|
| 576 | * if the interface is down. */
|
---|
| 577 | {
|
---|
| 578 | int i = 0;
|
---|
| 579 | char *p = addr6x+14;
|
---|
| 580 |
|
---|
| 581 | do {
|
---|
| 582 | if (!*p) {
|
---|
| 583 | if (i == 40) { /* nul terminator for 1st address? */
|
---|
| 584 | addr6x[39] = 0; /* Fixup... need 0 instead of ':'. */
|
---|
| 585 | ++p; /* Skip and continue. */
|
---|
| 586 | continue;
|
---|
| 587 | }
|
---|
| 588 | goto ERROR;
|
---|
| 589 | }
|
---|
| 590 | addr6x[i++] = *p++;
|
---|
| 591 | if (!((i+1) % 5)) {
|
---|
| 592 | addr6x[i++] = ':';
|
---|
| 593 | }
|
---|
| 594 | } while (i < 40+28+7);
|
---|
| 595 | }
|
---|
| 596 |
|
---|
| 597 | if (!(iflags & RTF_UP)) { /* Skip interfaces that are down. */
|
---|
| 598 | continue;
|
---|
| 599 | }
|
---|
| 600 |
|
---|
| 601 | set_flags(flags, (iflags & IPV6_MASK));
|
---|
| 602 |
|
---|
| 603 | r = 0;
|
---|
| 604 | do {
|
---|
| 605 | inet_pton(AF_INET6, addr6x + r,
|
---|
| 606 | (struct sockaddr *) &snaddr6.sin6_addr);
|
---|
| 607 | snaddr6.sin6_family = AF_INET6;
|
---|
| 608 | naddr6 = INET6_rresolve((struct sockaddr_in6 *) &snaddr6,
|
---|
| 609 | 0x0fff /* Apparently, upstream never resolves. */
|
---|
| 610 | );
|
---|
| 611 |
|
---|
| 612 | if (!r) { /* 1st pass */
|
---|
| 613 | snprintf(addr6, sizeof(addr6), "%s/%d", naddr6, prefix_len);
|
---|
| 614 | r += 40;
|
---|
| 615 | free(naddr6);
|
---|
| 616 | } else { /* 2nd pass */
|
---|
| 617 | /* Print the info. */
|
---|
| 618 | printf("%-43s %-39s %-5s %-6d %-2d %7d %-8s\n",
|
---|
| 619 | addr6, naddr6, flags, metric, refcnt, use, iface);
|
---|
| 620 | free(naddr6);
|
---|
| 621 | break;
|
---|
| 622 | }
|
---|
| 623 | } while (1);
|
---|
| 624 | }
|
---|
| 625 | }
|
---|
| 626 |
|
---|
| 627 | #endif
|
---|
| 628 |
|
---|
| 629 | #define ROUTE_OPT_A 0x01
|
---|
| 630 | #define ROUTE_OPT_n 0x02
|
---|
| 631 | #define ROUTE_OPT_e 0x04
|
---|
| 632 | #define ROUTE_OPT_INET6 0x08 /* Not an actual option. See below. */
|
---|
| 633 |
|
---|
| 634 | /* 1st byte is offset to next entry offset. 2nd byte is return value. */
|
---|
| 635 | /* 2nd byte matches RTACTION_* code */
|
---|
| 636 | static const char tbl_verb[] ALIGN1 =
|
---|
| 637 | "\006\001add\0"
|
---|
| 638 | "\006\002del\0"
|
---|
| 639 | /* "\011\002delete\0" */
|
---|
| 640 | "\010\002delete" /* Since it's last, we can save a byte. */
|
---|
| 641 | ;
|
---|
| 642 |
|
---|
| 643 | int route_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 644 | int route_main(int argc UNUSED_PARAM, char **argv)
|
---|
| 645 | {
|
---|
| 646 | unsigned opt;
|
---|
| 647 | int what;
|
---|
| 648 | char *family;
|
---|
| 649 | char **p;
|
---|
| 650 |
|
---|
| 651 | /* First, remap '-net' and '-host' to avoid getopt problems. */
|
---|
| 652 | p = argv;
|
---|
| 653 | while (*++p) {
|
---|
| 654 | if (strcmp(*p, "-net") == 0 || strcmp(*p, "-host") == 0) {
|
---|
| 655 | p[0][0] = '#';
|
---|
| 656 | }
|
---|
| 657 | }
|
---|
| 658 |
|
---|
| 659 | opt = getopt32(argv, "A:ne", &family);
|
---|
| 660 |
|
---|
| 661 | if ((opt & ROUTE_OPT_A) && strcmp(family, "inet") != 0) {
|
---|
| 662 | #if ENABLE_FEATURE_IPV6
|
---|
| 663 | if (strcmp(family, "inet6") == 0) {
|
---|
| 664 | opt |= ROUTE_OPT_INET6; /* Set flag for ipv6. */
|
---|
| 665 | } else
|
---|
| 666 | #endif
|
---|
| 667 | bb_show_usage();
|
---|
| 668 | }
|
---|
| 669 |
|
---|
| 670 | argv += optind;
|
---|
| 671 |
|
---|
| 672 | /* No more args means display the routing table. */
|
---|
| 673 | if (!*argv) {
|
---|
| 674 | int noresolve = (opt & ROUTE_OPT_n) ? 0x0fff : 0;
|
---|
| 675 | #if ENABLE_FEATURE_IPV6
|
---|
| 676 | if (opt & ROUTE_OPT_INET6)
|
---|
| 677 | INET6_displayroutes();
|
---|
| 678 | else
|
---|
| 679 | #endif
|
---|
| 680 | bb_displayroutes(noresolve, opt & ROUTE_OPT_e);
|
---|
| 681 |
|
---|
| 682 | fflush_stdout_and_exit(EXIT_SUCCESS);
|
---|
| 683 | }
|
---|
| 684 |
|
---|
| 685 | /* Check verb. At the moment, must be add, del, or delete. */
|
---|
| 686 | what = kw_lookup(tbl_verb, &argv);
|
---|
| 687 | if (!what || !*argv) { /* Unknown verb or no more args. */
|
---|
| 688 | bb_show_usage();
|
---|
| 689 | }
|
---|
| 690 |
|
---|
| 691 | #if ENABLE_FEATURE_IPV6
|
---|
| 692 | if (opt & ROUTE_OPT_INET6)
|
---|
| 693 | INET6_setroute(what, argv);
|
---|
| 694 | else
|
---|
| 695 | #endif
|
---|
| 696 | INET_setroute(what, argv);
|
---|
| 697 |
|
---|
| 698 | return EXIT_SUCCESS;
|
---|
| 699 | }
|
---|