[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 4 | *
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| 5 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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| 6 | *
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| 7 | * Changes:
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| 8 | *
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| 9 | * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
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| 10 | * Kunihiro Ishiguro <kunihiro@zebra.org> 001102: rtnh_ifindex was not initialized
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| 11 | */
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| 12 |
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| 13 | #include "ip_common.h" /* #include "libbb.h" is inside */
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| 14 | #include "rt_names.h"
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| 15 | #include "utils.h"
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| 16 |
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| 17 | #ifndef RTAX_RTTVAR
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| 18 | #define RTAX_RTTVAR RTAX_HOPS
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| 19 | #endif
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| 20 |
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| 21 |
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| 22 | struct filter_t {
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| 23 | int tb;
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| 24 | smallint flushed;
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| 25 | char *flushb;
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| 26 | int flushp;
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| 27 | int flushe;
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| 28 | struct rtnl_handle *rth;
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| 29 | //int protocol, protocolmask; - write-only fields?!
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| 30 | //int scope, scopemask; - unused
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| 31 | //int type; - read-only
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| 32 | //int typemask; - unused
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| 33 | //int tos, tosmask; - unused
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| 34 | int iif, iifmask;
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| 35 | int oif, oifmask;
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| 36 | //int realm, realmmask; - unused
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| 37 | //inet_prefix rprefsrc; - read-only
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| 38 | inet_prefix rvia;
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| 39 | inet_prefix rdst;
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| 40 | inet_prefix mdst;
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| 41 | inet_prefix rsrc;
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| 42 | inet_prefix msrc;
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| 43 | } FIX_ALIASING;
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| 44 | typedef struct filter_t filter_t;
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| 45 |
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| 46 | #define G_filter (*(filter_t*)&bb_common_bufsiz1)
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| 47 |
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| 48 | static int flush_update(void)
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| 49 | {
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| 50 | if (rtnl_send(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
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| 51 | bb_perror_msg("can't send flush request");
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| 52 | return -1;
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| 53 | }
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| 54 | G_filter.flushp = 0;
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| 55 | return 0;
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| 56 | }
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| 57 |
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| 58 | static unsigned get_hz(void)
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| 59 | {
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| 60 | static unsigned hz_internal;
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| 61 | FILE *fp;
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| 62 |
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| 63 | if (hz_internal)
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| 64 | return hz_internal;
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| 65 |
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| 66 | fp = fopen_for_read("/proc/net/psched");
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| 67 | if (fp) {
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| 68 | unsigned nom, denom;
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| 69 |
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| 70 | if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
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| 71 | if (nom == 1000000)
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| 72 | hz_internal = denom;
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| 73 | fclose(fp);
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| 74 | }
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| 75 | if (!hz_internal)
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| 76 | hz_internal = sysconf(_SC_CLK_TCK);
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| 77 | return hz_internal;
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| 78 | }
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| 79 |
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| 80 | static int FAST_FUNC print_route(const struct sockaddr_nl *who UNUSED_PARAM,
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| 81 | struct nlmsghdr *n, void *arg UNUSED_PARAM)
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| 82 | {
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| 83 | struct rtmsg *r = NLMSG_DATA(n);
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| 84 | int len = n->nlmsg_len;
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| 85 | struct rtattr * tb[RTA_MAX+1];
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| 86 | char abuf[256];
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| 87 | inet_prefix dst;
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| 88 | inet_prefix src;
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| 89 | int host_len = -1;
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| 90 | SPRINT_BUF(b1);
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| 91 |
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| 92 | if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
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| 93 | fprintf(stderr, "Not a route: %08x %08x %08x\n",
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| 94 | n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
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| 95 | return 0;
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| 96 | }
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| 97 | if (G_filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
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| 98 | return 0;
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| 99 | len -= NLMSG_LENGTH(sizeof(*r));
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| 100 | if (len < 0)
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| 101 | bb_error_msg_and_die("wrong nlmsg len %d", len);
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| 102 |
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| 103 | if (r->rtm_family == AF_INET6)
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| 104 | host_len = 128;
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| 105 | else if (r->rtm_family == AF_INET)
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| 106 | host_len = 32;
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| 107 |
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| 108 | if (r->rtm_family == AF_INET6) {
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| 109 | if (G_filter.tb) {
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| 110 | if (G_filter.tb < 0) {
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| 111 | if (!(r->rtm_flags & RTM_F_CLONED)) {
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| 112 | return 0;
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| 113 | }
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| 114 | } else {
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| 115 | if (r->rtm_flags & RTM_F_CLONED) {
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| 116 | return 0;
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| 117 | }
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| 118 | if (G_filter.tb == RT_TABLE_LOCAL) {
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| 119 | if (r->rtm_type != RTN_LOCAL) {
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| 120 | return 0;
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| 121 | }
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| 122 | } else if (G_filter.tb == RT_TABLE_MAIN) {
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| 123 | if (r->rtm_type == RTN_LOCAL) {
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| 124 | return 0;
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| 125 | }
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| 126 | } else {
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| 127 | return 0;
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| 128 | }
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| 129 | }
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| 130 | }
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| 131 | } else {
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| 132 | if (G_filter.tb > 0 && G_filter.tb != r->rtm_table) {
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| 133 | return 0;
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| 134 | }
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| 135 | }
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| 136 | if (G_filter.rdst.family
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| 137 | && (r->rtm_family != G_filter.rdst.family || G_filter.rdst.bitlen > r->rtm_dst_len)
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| 138 | ) {
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| 139 | return 0;
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| 140 | }
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| 141 | if (G_filter.mdst.family
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| 142 | && (r->rtm_family != G_filter.mdst.family
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| 143 | || (G_filter.mdst.bitlen >= 0 && G_filter.mdst.bitlen < r->rtm_dst_len)
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| 144 | )
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| 145 | ) {
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| 146 | return 0;
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| 147 | }
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| 148 | if (G_filter.rsrc.family
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| 149 | && (r->rtm_family != G_filter.rsrc.family || G_filter.rsrc.bitlen > r->rtm_src_len)
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| 150 | ) {
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| 151 | return 0;
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| 152 | }
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| 153 | if (G_filter.msrc.family
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| 154 | && (r->rtm_family != G_filter.msrc.family
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| 155 | || (G_filter.msrc.bitlen >= 0 && G_filter.msrc.bitlen < r->rtm_src_len)
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| 156 | )
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| 157 | ) {
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| 158 | return 0;
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| 159 | }
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| 160 |
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| 161 | memset(tb, 0, sizeof(tb));
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| 162 | parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
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| 163 |
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| 164 | if (G_filter.rdst.family
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| 165 | && inet_addr_match(&dst, &G_filter.rdst, G_filter.rdst.bitlen)
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| 166 | ) {
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| 167 | return 0;
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| 168 | }
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| 169 | if (G_filter.mdst.family
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| 170 | && G_filter.mdst.bitlen >= 0
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| 171 | && inet_addr_match(&dst, &G_filter.mdst, r->rtm_dst_len)
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| 172 | ) {
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| 173 | return 0;
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| 174 | }
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| 175 | if (G_filter.rsrc.family
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| 176 | && inet_addr_match(&src, &G_filter.rsrc, G_filter.rsrc.bitlen)
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| 177 | ) {
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| 178 | return 0;
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| 179 | }
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| 180 | if (G_filter.msrc.family && G_filter.msrc.bitlen >= 0
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| 181 | && inet_addr_match(&src, &G_filter.msrc, r->rtm_src_len)
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| 182 | ) {
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| 183 | return 0;
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| 184 | }
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| 185 | if (G_filter.flushb
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| 186 | && r->rtm_family == AF_INET6
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| 187 | && r->rtm_dst_len == 0
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| 188 | && r->rtm_type == RTN_UNREACHABLE
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| 189 | && tb[RTA_PRIORITY]
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| 190 | && *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1
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| 191 | ) {
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| 192 | return 0;
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| 193 | }
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| 194 |
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| 195 | if (G_filter.flushb) {
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| 196 | struct nlmsghdr *fn;
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| 197 | if (NLMSG_ALIGN(G_filter.flushp) + n->nlmsg_len > G_filter.flushe) {
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| 198 | if (flush_update())
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| 199 | bb_error_msg_and_die("flush");
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| 200 | }
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| 201 | fn = (struct nlmsghdr*)(G_filter.flushb + NLMSG_ALIGN(G_filter.flushp));
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| 202 | memcpy(fn, n, n->nlmsg_len);
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| 203 | fn->nlmsg_type = RTM_DELROUTE;
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| 204 | fn->nlmsg_flags = NLM_F_REQUEST;
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| 205 | fn->nlmsg_seq = ++G_filter.rth->seq;
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| 206 | G_filter.flushp = (((char*)fn) + n->nlmsg_len) - G_filter.flushb;
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| 207 | G_filter.flushed = 1;
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| 208 | return 0;
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| 209 | }
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| 210 |
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| 211 | if (n->nlmsg_type == RTM_DELROUTE) {
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| 212 | printf("Deleted ");
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| 213 | }
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| 214 | if (r->rtm_type != RTN_UNICAST /* && !G_filter.type - always 0 */) {
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| 215 | printf("%s ", rtnl_rtntype_n2a(r->rtm_type, b1));
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| 216 | }
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| 217 |
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| 218 | if (tb[RTA_DST]) {
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| 219 | if (r->rtm_dst_len != host_len) {
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| 220 | printf("%s/%u ", rt_addr_n2a(r->rtm_family,
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| 221 | RTA_DATA(tb[RTA_DST]),
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| 222 | abuf, sizeof(abuf)),
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| 223 | r->rtm_dst_len
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| 224 | );
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| 225 | } else {
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| 226 | printf("%s ", format_host(r->rtm_family,
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| 227 | RTA_PAYLOAD(tb[RTA_DST]),
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| 228 | RTA_DATA(tb[RTA_DST]),
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| 229 | abuf, sizeof(abuf))
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| 230 | );
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| 231 | }
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| 232 | } else if (r->rtm_dst_len) {
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| 233 | printf("0/%d ", r->rtm_dst_len);
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| 234 | } else {
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| 235 | printf("default ");
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| 236 | }
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| 237 | if (tb[RTA_SRC]) {
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| 238 | if (r->rtm_src_len != host_len) {
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| 239 | printf("from %s/%u ", rt_addr_n2a(r->rtm_family,
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| 240 | RTA_DATA(tb[RTA_SRC]),
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| 241 | abuf, sizeof(abuf)),
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| 242 | r->rtm_src_len
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| 243 | );
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| 244 | } else {
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| 245 | printf("from %s ", format_host(r->rtm_family,
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| 246 | RTA_PAYLOAD(tb[RTA_SRC]),
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| 247 | RTA_DATA(tb[RTA_SRC]),
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| 248 | abuf, sizeof(abuf))
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| 249 | );
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| 250 | }
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| 251 | } else if (r->rtm_src_len) {
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| 252 | printf("from 0/%u ", r->rtm_src_len);
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| 253 | }
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| 254 | if (tb[RTA_GATEWAY] && G_filter.rvia.bitlen != host_len) {
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| 255 | printf("via %s ", format_host(r->rtm_family,
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| 256 | RTA_PAYLOAD(tb[RTA_GATEWAY]),
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| 257 | RTA_DATA(tb[RTA_GATEWAY]),
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| 258 | abuf, sizeof(abuf)));
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| 259 | }
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| 260 | if (tb[RTA_OIF] && G_filter.oifmask != -1) {
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| 261 | printf("dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
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| 262 | }
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| 263 |
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| 264 | if (tb[RTA_PREFSRC] && /*G_filter.rprefsrc.bitlen - always 0*/ 0 != host_len) {
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| 265 | /* Do not use format_host(). It is our local addr
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| 266 | and symbolic name will not be useful.
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| 267 | */
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| 268 | printf(" src %s ", rt_addr_n2a(r->rtm_family,
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| 269 | RTA_DATA(tb[RTA_PREFSRC]),
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| 270 | abuf, sizeof(abuf)));
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| 271 | }
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| 272 | if (tb[RTA_PRIORITY]) {
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| 273 | printf(" metric %d ", *(uint32_t*)RTA_DATA(tb[RTA_PRIORITY]));
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| 274 | }
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| 275 | if (r->rtm_family == AF_INET6) {
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| 276 | struct rta_cacheinfo *ci = NULL;
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| 277 | if (tb[RTA_CACHEINFO]) {
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| 278 | ci = RTA_DATA(tb[RTA_CACHEINFO]);
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| 279 | }
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| 280 | if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
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| 281 | if (r->rtm_flags & RTM_F_CLONED) {
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| 282 | printf("%c cache ", _SL_);
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| 283 | }
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| 284 | if (ci->rta_expires) {
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| 285 | printf(" expires %dsec", ci->rta_expires / get_hz());
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| 286 | }
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| 287 | if (ci->rta_error != 0) {
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| 288 | printf(" error %d", ci->rta_error);
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| 289 | }
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| 290 | } else if (ci) {
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| 291 | if (ci->rta_error != 0)
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| 292 | printf(" error %d", ci->rta_error);
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| 293 | }
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| 294 | }
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| 295 | if (tb[RTA_IIF] && G_filter.iifmask != -1) {
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| 296 | printf(" iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF])));
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| 297 | }
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| 298 | bb_putchar('\n');
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| 299 | return 0;
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| 300 | }
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| 301 |
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| 302 | /* Return value becomes exitcode. It's okay to not return at all */
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| 303 | static int iproute_modify(int cmd, unsigned flags, char **argv)
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| 304 | {
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| 305 | static const char keywords[] ALIGN1 =
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| 306 | "src\0""via\0""mtu\0""lock\0""protocol\0"IF_FEATURE_IP_RULE("table\0")
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| 307 | "dev\0""oif\0""to\0""metric\0";
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| 308 | enum {
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| 309 | ARG_src,
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| 310 | ARG_via,
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| 311 | ARG_mtu, PARM_lock,
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| 312 | ARG_protocol,
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| 313 | IF_FEATURE_IP_RULE(ARG_table,)
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| 314 | ARG_dev,
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| 315 | ARG_oif,
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| 316 | ARG_to,
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| 317 | ARG_metric,
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| 318 | };
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| 319 | enum {
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| 320 | gw_ok = 1 << 0,
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| 321 | dst_ok = 1 << 1,
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| 322 | proto_ok = 1 << 2,
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| 323 | type_ok = 1 << 3
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| 324 | };
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| 325 | struct rtnl_handle rth;
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| 326 | struct {
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| 327 | struct nlmsghdr n;
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| 328 | struct rtmsg r;
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| 329 | char buf[1024];
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| 330 | } req;
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| 331 | char mxbuf[256];
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| 332 | struct rtattr * mxrta = (void*)mxbuf;
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| 333 | unsigned mxlock = 0;
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| 334 | char *d = NULL;
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| 335 | smalluint ok = 0;
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| 336 | int arg;
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| 337 |
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| 338 | memset(&req, 0, sizeof(req));
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| 339 |
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| 340 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
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| 341 | req.n.nlmsg_flags = NLM_F_REQUEST | flags;
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| 342 | req.n.nlmsg_type = cmd;
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| 343 | req.r.rtm_family = preferred_family;
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| 344 | if (RT_TABLE_MAIN) /* if it is zero, memset already did it */
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| 345 | req.r.rtm_table = RT_TABLE_MAIN;
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| 346 | if (RT_SCOPE_NOWHERE)
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| 347 | req.r.rtm_scope = RT_SCOPE_NOWHERE;
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| 348 |
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| 349 | if (cmd != RTM_DELROUTE) {
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| 350 | req.r.rtm_protocol = RTPROT_BOOT;
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| 351 | req.r.rtm_scope = RT_SCOPE_UNIVERSE;
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| 352 | req.r.rtm_type = RTN_UNICAST;
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| 353 | }
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| 354 |
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| 355 | mxrta->rta_type = RTA_METRICS;
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| 356 | mxrta->rta_len = RTA_LENGTH(0);
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| 357 |
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| 358 | while (*argv) {
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| 359 | arg = index_in_substrings(keywords, *argv);
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| 360 | if (arg == ARG_src) {
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| 361 | inet_prefix addr;
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| 362 | NEXT_ARG();
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| 363 | get_addr(&addr, *argv, req.r.rtm_family);
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| 364 | if (req.r.rtm_family == AF_UNSPEC)
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| 365 | req.r.rtm_family = addr.family;
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| 366 | addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
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| 367 | } else if (arg == ARG_via) {
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| 368 | inet_prefix addr;
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| 369 | ok |= gw_ok;
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| 370 | NEXT_ARG();
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| 371 | get_addr(&addr, *argv, req.r.rtm_family);
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| 372 | if (req.r.rtm_family == AF_UNSPEC) {
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| 373 | req.r.rtm_family = addr.family;
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| 374 | }
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| 375 | addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
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| 376 | } else if (arg == ARG_mtu) {
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| 377 | unsigned mtu;
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| 378 | NEXT_ARG();
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| 379 | if (index_in_strings(keywords, *argv) == PARM_lock) {
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| 380 | mxlock |= (1 << RTAX_MTU);
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| 381 | NEXT_ARG();
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| 382 | }
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| 383 | mtu = get_unsigned(*argv, "mtu");
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| 384 | rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
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| 385 | } else if (arg == ARG_protocol) {
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| 386 | uint32_t prot;
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| 387 | NEXT_ARG();
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| 388 | if (rtnl_rtprot_a2n(&prot, *argv))
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| 389 | invarg(*argv, "protocol");
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| 390 | req.r.rtm_protocol = prot;
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| 391 | ok |= proto_ok;
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| 392 | #if ENABLE_FEATURE_IP_RULE
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| 393 | } else if (arg == ARG_table) {
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| 394 | uint32_t tid;
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| 395 | NEXT_ARG();
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| 396 | if (rtnl_rttable_a2n(&tid, *argv))
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| 397 | invarg(*argv, "table");
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| 398 | req.r.rtm_table = tid;
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| 399 | #endif
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| 400 | } else if (arg == ARG_dev || arg == ARG_oif) {
|
---|
| 401 | NEXT_ARG();
|
---|
| 402 | d = *argv;
|
---|
| 403 | } else if (arg == ARG_metric) {
|
---|
| 404 | uint32_t metric;
|
---|
| 405 | NEXT_ARG();
|
---|
| 406 | metric = get_u32(*argv, "metric");
|
---|
| 407 | addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric);
|
---|
| 408 | } else {
|
---|
| 409 | int type;
|
---|
| 410 | inet_prefix dst;
|
---|
| 411 |
|
---|
| 412 | if (arg == ARG_to) {
|
---|
| 413 | NEXT_ARG();
|
---|
| 414 | }
|
---|
| 415 | if ((**argv < '0' || **argv > '9')
|
---|
| 416 | && rtnl_rtntype_a2n(&type, *argv) == 0) {
|
---|
| 417 | NEXT_ARG();
|
---|
| 418 | req.r.rtm_type = type;
|
---|
| 419 | ok |= type_ok;
|
---|
| 420 | }
|
---|
| 421 |
|
---|
| 422 | if (ok & dst_ok) {
|
---|
| 423 | duparg2("to", *argv);
|
---|
| 424 | }
|
---|
| 425 | get_prefix(&dst, *argv, req.r.rtm_family);
|
---|
| 426 | if (req.r.rtm_family == AF_UNSPEC) {
|
---|
| 427 | req.r.rtm_family = dst.family;
|
---|
| 428 | }
|
---|
| 429 | req.r.rtm_dst_len = dst.bitlen;
|
---|
| 430 | ok |= dst_ok;
|
---|
| 431 | if (dst.bytelen) {
|
---|
| 432 | addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
|
---|
| 433 | }
|
---|
| 434 | }
|
---|
| 435 | argv++;
|
---|
| 436 | }
|
---|
| 437 |
|
---|
| 438 | xrtnl_open(&rth);
|
---|
| 439 |
|
---|
| 440 | if (d) {
|
---|
| 441 | int idx;
|
---|
| 442 |
|
---|
| 443 | ll_init_map(&rth);
|
---|
| 444 |
|
---|
| 445 | if (d) {
|
---|
| 446 | idx = xll_name_to_index(d);
|
---|
| 447 | addattr32(&req.n, sizeof(req), RTA_OIF, idx);
|
---|
| 448 | }
|
---|
| 449 | }
|
---|
| 450 |
|
---|
| 451 | if (mxrta->rta_len > RTA_LENGTH(0)) {
|
---|
| 452 | if (mxlock) {
|
---|
| 453 | rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
|
---|
| 454 | }
|
---|
| 455 | addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
|
---|
| 456 | }
|
---|
| 457 |
|
---|
| 458 | if (req.r.rtm_type == RTN_LOCAL || req.r.rtm_type == RTN_NAT)
|
---|
| 459 | req.r.rtm_scope = RT_SCOPE_HOST;
|
---|
| 460 | else
|
---|
| 461 | if (req.r.rtm_type == RTN_BROADCAST
|
---|
| 462 | || req.r.rtm_type == RTN_MULTICAST
|
---|
| 463 | || req.r.rtm_type == RTN_ANYCAST
|
---|
| 464 | ) {
|
---|
| 465 | req.r.rtm_scope = RT_SCOPE_LINK;
|
---|
| 466 | }
|
---|
| 467 | else if (req.r.rtm_type == RTN_UNICAST || req.r.rtm_type == RTN_UNSPEC) {
|
---|
| 468 | if (cmd == RTM_DELROUTE)
|
---|
| 469 | req.r.rtm_scope = RT_SCOPE_NOWHERE;
|
---|
| 470 | else if (!(ok & gw_ok))
|
---|
| 471 | req.r.rtm_scope = RT_SCOPE_LINK;
|
---|
| 472 | }
|
---|
| 473 |
|
---|
| 474 | if (req.r.rtm_family == AF_UNSPEC) {
|
---|
| 475 | req.r.rtm_family = AF_INET;
|
---|
| 476 | }
|
---|
| 477 |
|
---|
| 478 | if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) {
|
---|
| 479 | return 2;
|
---|
| 480 | }
|
---|
| 481 |
|
---|
| 482 | return 0;
|
---|
| 483 | }
|
---|
| 484 |
|
---|
| 485 | static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
|
---|
| 486 | {
|
---|
| 487 | struct {
|
---|
| 488 | struct nlmsghdr nlh;
|
---|
| 489 | struct rtmsg rtm;
|
---|
| 490 | } req;
|
---|
| 491 | struct sockaddr_nl nladdr;
|
---|
| 492 |
|
---|
| 493 | memset(&nladdr, 0, sizeof(nladdr));
|
---|
| 494 | memset(&req, 0, sizeof(req));
|
---|
| 495 | nladdr.nl_family = AF_NETLINK;
|
---|
| 496 |
|
---|
| 497 | req.nlh.nlmsg_len = sizeof(req);
|
---|
| 498 | if (RTM_GETROUTE)
|
---|
| 499 | req.nlh.nlmsg_type = RTM_GETROUTE;
|
---|
| 500 | if (NLM_F_ROOT | NLM_F_REQUEST)
|
---|
| 501 | req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_REQUEST;
|
---|
| 502 | /*req.nlh.nlmsg_pid = 0; - memset did it already */
|
---|
| 503 | req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
|
---|
| 504 | req.rtm.rtm_family = family;
|
---|
| 505 | if (RTM_F_CLONED)
|
---|
| 506 | req.rtm.rtm_flags = RTM_F_CLONED;
|
---|
| 507 |
|
---|
| 508 | return xsendto(rth->fd, (void*)&req, sizeof(req), (struct sockaddr*)&nladdr, sizeof(nladdr));
|
---|
| 509 | }
|
---|
| 510 |
|
---|
| 511 | static void iproute_flush_cache(void)
|
---|
| 512 | {
|
---|
| 513 | static const char fn[] ALIGN1 = "/proc/sys/net/ipv4/route/flush";
|
---|
| 514 | int flush_fd = open_or_warn(fn, O_WRONLY);
|
---|
| 515 |
|
---|
| 516 | if (flush_fd < 0) {
|
---|
| 517 | return;
|
---|
| 518 | }
|
---|
| 519 |
|
---|
| 520 | if (write(flush_fd, "-1", 2) < 2) {
|
---|
| 521 | bb_perror_msg("can't flush routing cache");
|
---|
| 522 | return;
|
---|
| 523 | }
|
---|
| 524 | close(flush_fd);
|
---|
| 525 | }
|
---|
| 526 |
|
---|
| 527 | static void iproute_reset_filter(void)
|
---|
| 528 | {
|
---|
| 529 | memset(&G_filter, 0, sizeof(G_filter));
|
---|
| 530 | G_filter.mdst.bitlen = -1;
|
---|
| 531 | G_filter.msrc.bitlen = -1;
|
---|
| 532 | }
|
---|
| 533 |
|
---|
| 534 | /* Return value becomes exitcode. It's okay to not return at all */
|
---|
| 535 | static int iproute_list_or_flush(char **argv, int flush)
|
---|
| 536 | {
|
---|
| 537 | int do_ipv6 = preferred_family;
|
---|
| 538 | struct rtnl_handle rth;
|
---|
| 539 | char *id = NULL;
|
---|
| 540 | char *od = NULL;
|
---|
| 541 | static const char keywords[] ALIGN1 =
|
---|
| 542 | /* "ip route list/flush" parameters: */
|
---|
| 543 | "protocol\0" "dev\0" "oif\0" "iif\0"
|
---|
| 544 | "via\0" "table\0" "cache\0"
|
---|
| 545 | "from\0" "to\0"
|
---|
| 546 | /* and possible further keywords */
|
---|
| 547 | "all\0"
|
---|
| 548 | "root\0"
|
---|
| 549 | "match\0"
|
---|
| 550 | "exact\0"
|
---|
| 551 | "main\0"
|
---|
| 552 | ;
|
---|
| 553 | enum {
|
---|
| 554 | KW_proto, KW_dev, KW_oif, KW_iif,
|
---|
| 555 | KW_via, KW_table, KW_cache,
|
---|
| 556 | KW_from, KW_to,
|
---|
| 557 | /* */
|
---|
| 558 | KW_all,
|
---|
| 559 | KW_root,
|
---|
| 560 | KW_match,
|
---|
| 561 | KW_exact,
|
---|
| 562 | KW_main,
|
---|
| 563 | };
|
---|
| 564 | int arg, parm;
|
---|
| 565 |
|
---|
| 566 | iproute_reset_filter();
|
---|
| 567 | G_filter.tb = RT_TABLE_MAIN;
|
---|
| 568 |
|
---|
| 569 | if (flush && !*argv)
|
---|
| 570 | bb_error_msg_and_die(bb_msg_requires_arg, "\"ip route flush\"");
|
---|
| 571 |
|
---|
| 572 | while (*argv) {
|
---|
| 573 | arg = index_in_substrings(keywords, *argv);
|
---|
| 574 | if (arg == KW_proto) {
|
---|
| 575 | uint32_t prot = 0;
|
---|
| 576 | NEXT_ARG();
|
---|
| 577 | //G_filter.protocolmask = -1;
|
---|
| 578 | if (rtnl_rtprot_a2n(&prot, *argv)) {
|
---|
| 579 | if (index_in_strings(keywords, *argv) != KW_all)
|
---|
| 580 | invarg(*argv, "protocol");
|
---|
| 581 | prot = 0;
|
---|
| 582 | //G_filter.protocolmask = 0;
|
---|
| 583 | }
|
---|
| 584 | //G_filter.protocol = prot;
|
---|
| 585 | } else if (arg == KW_dev || arg == KW_oif) {
|
---|
| 586 | NEXT_ARG();
|
---|
| 587 | od = *argv;
|
---|
| 588 | } else if (arg == KW_iif) {
|
---|
| 589 | NEXT_ARG();
|
---|
| 590 | id = *argv;
|
---|
| 591 | } else if (arg == KW_via) {
|
---|
| 592 | NEXT_ARG();
|
---|
| 593 | get_prefix(&G_filter.rvia, *argv, do_ipv6);
|
---|
| 594 | } else if (arg == KW_table) { /* table all/cache/main */
|
---|
| 595 | NEXT_ARG();
|
---|
| 596 | parm = index_in_substrings(keywords, *argv);
|
---|
| 597 | if (parm == KW_cache)
|
---|
| 598 | G_filter.tb = -1;
|
---|
| 599 | else if (parm == KW_all)
|
---|
| 600 | G_filter.tb = 0;
|
---|
| 601 | else if (parm != KW_main) {
|
---|
| 602 | #if ENABLE_FEATURE_IP_RULE
|
---|
| 603 | uint32_t tid;
|
---|
| 604 | if (rtnl_rttable_a2n(&tid, *argv))
|
---|
| 605 | invarg(*argv, "table");
|
---|
| 606 | G_filter.tb = tid;
|
---|
| 607 | #else
|
---|
| 608 | invarg(*argv, "table");
|
---|
| 609 | #endif
|
---|
| 610 | }
|
---|
| 611 | } else if (arg == KW_cache) {
|
---|
| 612 | /* The command 'ip route flush cache' is used by OpenSWAN.
|
---|
| 613 | * Assuming it's a synonym for 'ip route flush table cache' */
|
---|
| 614 | G_filter.tb = -1;
|
---|
| 615 | } else if (arg == KW_from) {
|
---|
| 616 | NEXT_ARG();
|
---|
| 617 | parm = index_in_substrings(keywords, *argv);
|
---|
| 618 | if (parm == KW_root) {
|
---|
| 619 | NEXT_ARG();
|
---|
| 620 | get_prefix(&G_filter.rsrc, *argv, do_ipv6);
|
---|
| 621 | } else if (parm == KW_match) {
|
---|
| 622 | NEXT_ARG();
|
---|
| 623 | get_prefix(&G_filter.msrc, *argv, do_ipv6);
|
---|
| 624 | } else {
|
---|
| 625 | if (parm == KW_exact)
|
---|
| 626 | NEXT_ARG();
|
---|
| 627 | get_prefix(&G_filter.msrc, *argv, do_ipv6);
|
---|
| 628 | G_filter.rsrc = G_filter.msrc;
|
---|
| 629 | }
|
---|
| 630 | } else { /* "to" is the default parameter */
|
---|
| 631 | if (arg == KW_to) {
|
---|
| 632 | NEXT_ARG();
|
---|
| 633 | arg = index_in_substrings(keywords, *argv);
|
---|
| 634 | }
|
---|
| 635 | /* parm = arg; - would be more plausible, but we reuse 'arg' here */
|
---|
| 636 | if (arg == KW_root) {
|
---|
| 637 | NEXT_ARG();
|
---|
| 638 | get_prefix(&G_filter.rdst, *argv, do_ipv6);
|
---|
| 639 | } else if (arg == KW_match) {
|
---|
| 640 | NEXT_ARG();
|
---|
| 641 | get_prefix(&G_filter.mdst, *argv, do_ipv6);
|
---|
| 642 | } else { /* "to exact" is the default */
|
---|
| 643 | if (arg == KW_exact)
|
---|
| 644 | NEXT_ARG();
|
---|
| 645 | get_prefix(&G_filter.mdst, *argv, do_ipv6);
|
---|
| 646 | G_filter.rdst = G_filter.mdst;
|
---|
| 647 | }
|
---|
| 648 | }
|
---|
| 649 | argv++;
|
---|
| 650 | }
|
---|
| 651 |
|
---|
| 652 | if (do_ipv6 == AF_UNSPEC && G_filter.tb) {
|
---|
| 653 | do_ipv6 = AF_INET;
|
---|
| 654 | }
|
---|
| 655 |
|
---|
| 656 | xrtnl_open(&rth);
|
---|
| 657 | ll_init_map(&rth);
|
---|
| 658 |
|
---|
| 659 | if (id || od) {
|
---|
| 660 | int idx;
|
---|
| 661 |
|
---|
| 662 | if (id) {
|
---|
| 663 | idx = xll_name_to_index(id);
|
---|
| 664 | G_filter.iif = idx;
|
---|
| 665 | G_filter.iifmask = -1;
|
---|
| 666 | }
|
---|
| 667 | if (od) {
|
---|
| 668 | idx = xll_name_to_index(od);
|
---|
| 669 | G_filter.oif = idx;
|
---|
| 670 | G_filter.oifmask = -1;
|
---|
| 671 | }
|
---|
| 672 | }
|
---|
| 673 |
|
---|
| 674 | if (flush) {
|
---|
| 675 | char flushb[4096-512];
|
---|
| 676 |
|
---|
| 677 | if (G_filter.tb == -1) { /* "flush table cache" */
|
---|
| 678 | if (do_ipv6 != AF_INET6)
|
---|
| 679 | iproute_flush_cache();
|
---|
| 680 | if (do_ipv6 == AF_INET)
|
---|
| 681 | return 0;
|
---|
| 682 | }
|
---|
| 683 |
|
---|
| 684 | G_filter.flushb = flushb;
|
---|
| 685 | G_filter.flushp = 0;
|
---|
| 686 | G_filter.flushe = sizeof(flushb);
|
---|
| 687 | G_filter.rth = &rth;
|
---|
| 688 |
|
---|
| 689 | for (;;) {
|
---|
| 690 | xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
|
---|
| 691 | G_filter.flushed = 0;
|
---|
| 692 | xrtnl_dump_filter(&rth, print_route, NULL);
|
---|
| 693 | if (G_filter.flushed == 0)
|
---|
| 694 | return 0;
|
---|
| 695 | if (flush_update())
|
---|
| 696 | return 1;
|
---|
| 697 | }
|
---|
| 698 | }
|
---|
| 699 |
|
---|
| 700 | if (G_filter.tb != -1) {
|
---|
| 701 | xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
|
---|
| 702 | } else if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
|
---|
| 703 | bb_perror_msg_and_die("can't send dump request");
|
---|
| 704 | }
|
---|
| 705 | xrtnl_dump_filter(&rth, print_route, NULL);
|
---|
| 706 |
|
---|
| 707 | return 0;
|
---|
| 708 | }
|
---|
| 709 |
|
---|
| 710 |
|
---|
| 711 | /* Return value becomes exitcode. It's okay to not return at all */
|
---|
| 712 | static int iproute_get(char **argv)
|
---|
| 713 | {
|
---|
| 714 | struct rtnl_handle rth;
|
---|
| 715 | struct {
|
---|
| 716 | struct nlmsghdr n;
|
---|
| 717 | struct rtmsg r;
|
---|
| 718 | char buf[1024];
|
---|
| 719 | } req;
|
---|
| 720 | char *idev = NULL;
|
---|
| 721 | char *odev = NULL;
|
---|
| 722 | bool connected = 0;
|
---|
| 723 | bool from_ok = 0;
|
---|
| 724 | static const char options[] ALIGN1 =
|
---|
| 725 | "from\0""iif\0""oif\0""dev\0""notify\0""connected\0""to\0";
|
---|
| 726 |
|
---|
| 727 | memset(&req, 0, sizeof(req));
|
---|
| 728 |
|
---|
| 729 | iproute_reset_filter();
|
---|
| 730 |
|
---|
| 731 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
|
---|
| 732 | if (NLM_F_REQUEST)
|
---|
| 733 | req.n.nlmsg_flags = NLM_F_REQUEST;
|
---|
| 734 | if (RTM_GETROUTE)
|
---|
| 735 | req.n.nlmsg_type = RTM_GETROUTE;
|
---|
| 736 | req.r.rtm_family = preferred_family;
|
---|
| 737 | /*req.r.rtm_table = 0; - memset did this already */
|
---|
| 738 | /*req.r.rtm_protocol = 0;*/
|
---|
| 739 | /*req.r.rtm_scope = 0;*/
|
---|
| 740 | /*req.r.rtm_type = 0;*/
|
---|
| 741 | /*req.r.rtm_src_len = 0;*/
|
---|
| 742 | /*req.r.rtm_dst_len = 0;*/
|
---|
| 743 | /*req.r.rtm_tos = 0;*/
|
---|
| 744 |
|
---|
| 745 | while (*argv) {
|
---|
| 746 | switch (index_in_strings(options, *argv)) {
|
---|
| 747 | case 0: /* from */
|
---|
| 748 | {
|
---|
| 749 | inet_prefix addr;
|
---|
| 750 | NEXT_ARG();
|
---|
| 751 | from_ok = 1;
|
---|
| 752 | get_prefix(&addr, *argv, req.r.rtm_family);
|
---|
| 753 | if (req.r.rtm_family == AF_UNSPEC) {
|
---|
| 754 | req.r.rtm_family = addr.family;
|
---|
| 755 | }
|
---|
| 756 | if (addr.bytelen) {
|
---|
| 757 | addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
|
---|
| 758 | }
|
---|
| 759 | req.r.rtm_src_len = addr.bitlen;
|
---|
| 760 | break;
|
---|
| 761 | }
|
---|
| 762 | case 1: /* iif */
|
---|
| 763 | NEXT_ARG();
|
---|
| 764 | idev = *argv;
|
---|
| 765 | break;
|
---|
| 766 | case 2: /* oif */
|
---|
| 767 | case 3: /* dev */
|
---|
| 768 | NEXT_ARG();
|
---|
| 769 | odev = *argv;
|
---|
| 770 | break;
|
---|
| 771 | case 4: /* notify */
|
---|
| 772 | req.r.rtm_flags |= RTM_F_NOTIFY;
|
---|
| 773 | break;
|
---|
| 774 | case 5: /* connected */
|
---|
| 775 | connected = 1;
|
---|
| 776 | break;
|
---|
| 777 | case 6: /* to */
|
---|
| 778 | NEXT_ARG();
|
---|
| 779 | default:
|
---|
| 780 | {
|
---|
| 781 | inet_prefix addr;
|
---|
| 782 | get_prefix(&addr, *argv, req.r.rtm_family);
|
---|
| 783 | if (req.r.rtm_family == AF_UNSPEC) {
|
---|
| 784 | req.r.rtm_family = addr.family;
|
---|
| 785 | }
|
---|
| 786 | if (addr.bytelen) {
|
---|
| 787 | addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
|
---|
| 788 | }
|
---|
| 789 | req.r.rtm_dst_len = addr.bitlen;
|
---|
| 790 | }
|
---|
| 791 | }
|
---|
| 792 | argv++;
|
---|
| 793 | }
|
---|
| 794 |
|
---|
| 795 | if (req.r.rtm_dst_len == 0) {
|
---|
| 796 | bb_error_msg_and_die("need at least destination address");
|
---|
| 797 | }
|
---|
| 798 |
|
---|
| 799 | xrtnl_open(&rth);
|
---|
| 800 |
|
---|
| 801 | ll_init_map(&rth);
|
---|
| 802 |
|
---|
| 803 | if (idev || odev) {
|
---|
| 804 | int idx;
|
---|
| 805 |
|
---|
| 806 | if (idev) {
|
---|
| 807 | idx = xll_name_to_index(idev);
|
---|
| 808 | addattr32(&req.n, sizeof(req), RTA_IIF, idx);
|
---|
| 809 | }
|
---|
| 810 | if (odev) {
|
---|
| 811 | idx = xll_name_to_index(odev);
|
---|
| 812 | addattr32(&req.n, sizeof(req), RTA_OIF, idx);
|
---|
| 813 | }
|
---|
| 814 | }
|
---|
| 815 |
|
---|
| 816 | if (req.r.rtm_family == AF_UNSPEC) {
|
---|
| 817 | req.r.rtm_family = AF_INET;
|
---|
| 818 | }
|
---|
| 819 |
|
---|
| 820 | if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
|
---|
| 821 | return 2;
|
---|
| 822 | }
|
---|
| 823 |
|
---|
| 824 | if (connected && !from_ok) {
|
---|
| 825 | struct rtmsg *r = NLMSG_DATA(&req.n);
|
---|
| 826 | int len = req.n.nlmsg_len;
|
---|
| 827 | struct rtattr * tb[RTA_MAX+1];
|
---|
| 828 |
|
---|
| 829 | print_route(NULL, &req.n, NULL);
|
---|
| 830 |
|
---|
| 831 | if (req.n.nlmsg_type != RTM_NEWROUTE) {
|
---|
| 832 | bb_error_msg_and_die("not a route?");
|
---|
| 833 | }
|
---|
| 834 | len -= NLMSG_LENGTH(sizeof(*r));
|
---|
| 835 | if (len < 0) {
|
---|
| 836 | bb_error_msg_and_die("wrong len %d", len);
|
---|
| 837 | }
|
---|
| 838 |
|
---|
| 839 | memset(tb, 0, sizeof(tb));
|
---|
| 840 | parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
|
---|
| 841 |
|
---|
| 842 | if (tb[RTA_PREFSRC]) {
|
---|
| 843 | tb[RTA_PREFSRC]->rta_type = RTA_SRC;
|
---|
| 844 | r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
|
---|
| 845 | } else if (!tb[RTA_SRC]) {
|
---|
| 846 | bb_error_msg_and_die("can't connect the route");
|
---|
| 847 | }
|
---|
| 848 | if (!odev && tb[RTA_OIF]) {
|
---|
| 849 | tb[RTA_OIF]->rta_type = 0;
|
---|
| 850 | }
|
---|
| 851 | if (tb[RTA_GATEWAY]) {
|
---|
| 852 | tb[RTA_GATEWAY]->rta_type = 0;
|
---|
| 853 | }
|
---|
| 854 | if (!idev && tb[RTA_IIF]) {
|
---|
| 855 | tb[RTA_IIF]->rta_type = 0;
|
---|
| 856 | }
|
---|
| 857 | req.n.nlmsg_flags = NLM_F_REQUEST;
|
---|
| 858 | req.n.nlmsg_type = RTM_GETROUTE;
|
---|
| 859 |
|
---|
| 860 | if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
|
---|
| 861 | return 2;
|
---|
| 862 | }
|
---|
| 863 | }
|
---|
| 864 | print_route(NULL, &req.n, NULL);
|
---|
| 865 | return 0;
|
---|
| 866 | }
|
---|
| 867 |
|
---|
| 868 | /* Return value becomes exitcode. It's okay to not return at all */
|
---|
| 869 | int FAST_FUNC do_iproute(char **argv)
|
---|
| 870 | {
|
---|
| 871 | static const char ip_route_commands[] ALIGN1 =
|
---|
| 872 | /*0-3*/ "add\0""append\0""change\0""chg\0"
|
---|
| 873 | /*4-7*/ "delete\0""get\0""list\0""show\0"
|
---|
| 874 | /*8..*/ "prepend\0""replace\0""test\0""flush\0";
|
---|
| 875 | int command_num;
|
---|
| 876 | unsigned flags = 0;
|
---|
| 877 | int cmd = RTM_NEWROUTE;
|
---|
| 878 |
|
---|
| 879 | if (!*argv)
|
---|
| 880 | return iproute_list_or_flush(argv, 0);
|
---|
| 881 |
|
---|
| 882 | /* "Standard" 'ip r a' treats 'a' as 'add', not 'append' */
|
---|
| 883 | /* It probably means that it is using "first match" rule */
|
---|
| 884 | command_num = index_in_substrings(ip_route_commands, *argv);
|
---|
| 885 |
|
---|
| 886 | switch (command_num) {
|
---|
| 887 | case 0: /* add */
|
---|
| 888 | flags = NLM_F_CREATE|NLM_F_EXCL;
|
---|
| 889 | break;
|
---|
| 890 | case 1: /* append */
|
---|
| 891 | flags = NLM_F_CREATE|NLM_F_APPEND;
|
---|
| 892 | break;
|
---|
| 893 | case 2: /* change */
|
---|
| 894 | case 3: /* chg */
|
---|
| 895 | flags = NLM_F_REPLACE;
|
---|
| 896 | break;
|
---|
| 897 | case 4: /* delete */
|
---|
| 898 | cmd = RTM_DELROUTE;
|
---|
| 899 | break;
|
---|
| 900 | case 5: /* get */
|
---|
| 901 | return iproute_get(argv+1);
|
---|
| 902 | case 6: /* list */
|
---|
| 903 | case 7: /* show */
|
---|
| 904 | return iproute_list_or_flush(argv+1, 0);
|
---|
| 905 | case 8: /* prepend */
|
---|
| 906 | flags = NLM_F_CREATE;
|
---|
| 907 | break;
|
---|
| 908 | case 9: /* replace */
|
---|
| 909 | flags = NLM_F_CREATE|NLM_F_REPLACE;
|
---|
| 910 | break;
|
---|
| 911 | case 10: /* test */
|
---|
| 912 | flags = NLM_F_EXCL;
|
---|
| 913 | break;
|
---|
| 914 | case 11: /* flush */
|
---|
| 915 | return iproute_list_or_flush(argv+1, 1);
|
---|
| 916 | default:
|
---|
| 917 | bb_error_msg_and_die("unknown command %s", *argv);
|
---|
| 918 | }
|
---|
| 919 |
|
---|
| 920 | return iproute_modify(cmd, flags, argv+1);
|
---|
| 921 | }
|
---|