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hush/networking/libiproute/iproute.c

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/* vi: set sw=4 ts=4: */
/*
* iproute.c "ip route".
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
*
* Changes:
*
* Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
* Kunihiro Ishiguro <kunihiro@zebra.org> 001102: rtnh_ifindex was not initialized
*/
#include "ip_common.h" /* #include "libbb.h" is inside */
#include "rt_names.h"
#include "utils.h"
#ifndef RTAX_RTTVAR
#define RTAX_RTTVAR RTAX_HOPS
#endif
typedef struct filter_t {
int tb;
int flushed;
char *flushb;
int flushp;
int flushe;
struct rtnl_handle *rth;
int protocol, protocolmask;
int scope, scopemask;
int type, typemask;
int tos, tosmask;
int iif, iifmask;
int oif, oifmask;
int realm, realmmask;
inet_prefix rprefsrc;
inet_prefix rvia;
inet_prefix rdst;
inet_prefix mdst;
inet_prefix rsrc;
inet_prefix msrc;
} filter_t;
#define filter (*(filter_t*)&bb_common_bufsiz1)
static int flush_update(void)
{
if (rtnl_send(filter.rth, filter.flushb, filter.flushp) < 0) {
bb_perror_msg("failed to send flush request");
return -1;
}
filter.flushp = 0;
return 0;
}
static unsigned get_hz(void)
{
static unsigned hz_internal;
FILE *fp;
if (hz_internal)
return hz_internal;
fp = fopen("/proc/net/psched", "r");
if (fp) {
unsigned nom, denom;
if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
if (nom == 1000000)
hz_internal = denom;
fclose(fp);
}
if (!hz_internal)
hz_internal = sysconf(_SC_CLK_TCK);
return hz_internal;
}
static int print_route(struct sockaddr_nl *who ATTRIBUTE_UNUSED,
struct nlmsghdr *n, void *arg)
{
FILE *fp = (FILE*)arg;
struct rtmsg *r = NLMSG_DATA(n);
int len = n->nlmsg_len;
struct rtattr * tb[RTA_MAX+1];
char abuf[256];
inet_prefix dst;
inet_prefix src;
int host_len = -1;
SPRINT_BUF(b1);
if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
fprintf(stderr, "Not a route: %08x %08x %08x\n",
n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
return 0;
}
if (filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
return 0;
len -= NLMSG_LENGTH(sizeof(*r));
if (len < 0)
bb_error_msg_and_die("wrong nlmsg len %d", len);
if (r->rtm_family == AF_INET6)
host_len = 128;
else if (r->rtm_family == AF_INET)
host_len = 32;
if (r->rtm_family == AF_INET6) {
if (filter.tb) {
if (filter.tb < 0) {
if (!(r->rtm_flags & RTM_F_CLONED)) {
return 0;
}
} else {
if (r->rtm_flags & RTM_F_CLONED) {
return 0;
}
if (filter.tb == RT_TABLE_LOCAL) {
if (r->rtm_type != RTN_LOCAL) {
return 0;
}
} else if (filter.tb == RT_TABLE_MAIN) {
if (r->rtm_type == RTN_LOCAL) {
return 0;
}
} else {
return 0;
}
}
}
} else {
if (filter.tb > 0 && filter.tb != r->rtm_table) {
return 0;
}
}
if (filter.rdst.family &&
(r->rtm_family != filter.rdst.family || filter.rdst.bitlen > r->rtm_dst_len)) {
return 0;
}
if (filter.mdst.family &&
(r->rtm_family != filter.mdst.family ||
(filter.mdst.bitlen >= 0 && filter.mdst.bitlen < r->rtm_dst_len))) {
return 0;
}
if (filter.rsrc.family &&
(r->rtm_family != filter.rsrc.family || filter.rsrc.bitlen > r->rtm_src_len)) {
return 0;
}
if (filter.msrc.family &&
(r->rtm_family != filter.msrc.family ||
(filter.msrc.bitlen >= 0 && filter.msrc.bitlen < r->rtm_src_len))) {
return 0;
}
memset(tb, 0, sizeof(tb));
parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
if (filter.rdst.family && inet_addr_match(&dst, &filter.rdst, filter.rdst.bitlen))
return 0;
if (filter.mdst.family && filter.mdst.bitlen >= 0 &&
inet_addr_match(&dst, &filter.mdst, r->rtm_dst_len))
return 0;
if (filter.rsrc.family && inet_addr_match(&src, &filter.rsrc, filter.rsrc.bitlen))
return 0;
if (filter.msrc.family && filter.msrc.bitlen >= 0 &&
inet_addr_match(&src, &filter.msrc, r->rtm_src_len))
return 0;
if (filter.flushb &&
r->rtm_family == AF_INET6 &&
r->rtm_dst_len == 0 &&
r->rtm_type == RTN_UNREACHABLE &&
tb[RTA_PRIORITY] &&
*(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1)
return 0;
if (filter.flushb) {
struct nlmsghdr *fn;
if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
if (flush_update())
bb_error_msg_and_die("flush");
}
fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp));
memcpy(fn, n, n->nlmsg_len);
fn->nlmsg_type = RTM_DELROUTE;
fn->nlmsg_flags = NLM_F_REQUEST;
fn->nlmsg_seq = ++filter.rth->seq;
filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb;
filter.flushed++;
return 0;
}
if (n->nlmsg_type == RTM_DELROUTE) {
fprintf(fp, "Deleted ");
}
if (r->rtm_type != RTN_UNICAST && !filter.type) {
fprintf(fp, "%s ", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
}
if (tb[RTA_DST]) {
if (r->rtm_dst_len != host_len) {
fprintf(fp, "%s/%u ", rt_addr_n2a(r->rtm_family,
RTA_PAYLOAD(tb[RTA_DST]),
RTA_DATA(tb[RTA_DST]),
abuf, sizeof(abuf)),
r->rtm_dst_len
);
} else {
fprintf(fp, "%s ", format_host(r->rtm_family,
RTA_PAYLOAD(tb[RTA_DST]),
RTA_DATA(tb[RTA_DST]),
abuf, sizeof(abuf))
);
}
} else if (r->rtm_dst_len) {
fprintf(fp, "0/%d ", r->rtm_dst_len);
} else {
fprintf(fp, "default ");
}
if (tb[RTA_SRC]) {
if (r->rtm_src_len != host_len) {
fprintf(fp, "from %s/%u ", rt_addr_n2a(r->rtm_family,
RTA_PAYLOAD(tb[RTA_SRC]),
RTA_DATA(tb[RTA_SRC]),
abuf, sizeof(abuf)),
r->rtm_src_len
);
} else {
fprintf(fp, "from %s ", format_host(r->rtm_family,
RTA_PAYLOAD(tb[RTA_SRC]),
RTA_DATA(tb[RTA_SRC]),
abuf, sizeof(abuf))
);
}
} else if (r->rtm_src_len) {
fprintf(fp, "from 0/%u ", r->rtm_src_len);
}
if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len) {
fprintf(fp, "via %s ",
format_host(r->rtm_family,
RTA_PAYLOAD(tb[RTA_GATEWAY]),
RTA_DATA(tb[RTA_GATEWAY]),
abuf, sizeof(abuf)));
}
if (tb[RTA_OIF] && filter.oifmask != -1) {
fprintf(fp, "dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
}
if (tb[RTA_PREFSRC] && filter.rprefsrc.bitlen != host_len) {
/* Do not use format_host(). It is our local addr
and symbolic name will not be useful.
*/
fprintf(fp, " src %s ",
rt_addr_n2a(r->rtm_family,
RTA_PAYLOAD(tb[RTA_PREFSRC]),
RTA_DATA(tb[RTA_PREFSRC]),
abuf, sizeof(abuf)));
}
if (tb[RTA_PRIORITY]) {
fprintf(fp, " metric %d ", *(uint32_t*)RTA_DATA(tb[RTA_PRIORITY]));
}
if (r->rtm_family == AF_INET6) {
struct rta_cacheinfo *ci = NULL;
if (tb[RTA_CACHEINFO]) {
ci = RTA_DATA(tb[RTA_CACHEINFO]);
}
if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
if (r->rtm_flags & RTM_F_CLONED) {
fprintf(fp, "%c cache ", _SL_);
}
if (ci->rta_expires) {
fprintf(fp, " expires %dsec", ci->rta_expires / get_hz());
}
if (ci->rta_error != 0) {
fprintf(fp, " error %d", ci->rta_error);
}
} else if (ci) {
if (ci->rta_error != 0)
fprintf(fp, " error %d", ci->rta_error);
}
}
if (tb[RTA_IIF] && filter.iifmask != -1) {
fprintf(fp, " iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF])));
}
fputc('\n', fp);
fflush(fp);
return 0;
}
/* Return value becomes exitcode. It's okay to not return at all */
static int iproute_modify(int cmd, unsigned flags, char **argv)
{
static const char keywords[] ALIGN1 =
"src\0""via\0""mtu\0""lock\0""protocol\0"USE_FEATURE_IP_RULE("table\0")
"dev\0""oif\0""to\0";
enum {
ARG_src,
ARG_via,
ARG_mtu, PARM_lock,
ARG_protocol,
USE_FEATURE_IP_RULE(ARG_table,)
ARG_dev,
ARG_oif,
ARG_to
};
enum {
gw_ok = 1 << 0,
dst_ok = 1 << 1,
proto_ok = 1 << 2,
type_ok = 1 << 3
};
struct rtnl_handle rth;
struct {
struct nlmsghdr n;
struct rtmsg r;
char buf[1024];
} req;
char mxbuf[256];
struct rtattr * mxrta = (void*)mxbuf;
unsigned mxlock = 0;
char *d = NULL;
smalluint ok = 0;
int arg;
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
req.n.nlmsg_flags = NLM_F_REQUEST|flags;
req.n.nlmsg_type = cmd;
req.r.rtm_family = preferred_family;
req.r.rtm_table = RT_TABLE_MAIN;
req.r.rtm_scope = RT_SCOPE_NOWHERE;
if (cmd != RTM_DELROUTE) {
req.r.rtm_protocol = RTPROT_BOOT;
req.r.rtm_scope = RT_SCOPE_UNIVERSE;
req.r.rtm_type = RTN_UNICAST;
}
mxrta->rta_type = RTA_METRICS;
mxrta->rta_len = RTA_LENGTH(0);
while (*argv) {
arg = index_in_substrings(keywords, *argv);
if (arg == ARG_src) {
inet_prefix addr;
NEXT_ARG();
get_addr(&addr, *argv, req.r.rtm_family);
if (req.r.rtm_family == AF_UNSPEC)
req.r.rtm_family = addr.family;
addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
} else if (arg == ARG_via) {
inet_prefix addr;
ok |= gw_ok;
NEXT_ARG();
get_addr(&addr, *argv, req.r.rtm_family);
if (req.r.rtm_family == AF_UNSPEC) {
req.r.rtm_family = addr.family;
}
addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
} else if (arg == ARG_mtu) {
unsigned mtu;
NEXT_ARG();
if (index_in_strings(keywords, *argv) == PARM_lock) {
mxlock |= (1 << RTAX_MTU);
NEXT_ARG();
}
if (get_unsigned(&mtu, *argv, 0))
invarg(*argv, "mtu");
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
} else if (arg == ARG_protocol) {
uint32_t prot;
NEXT_ARG();
if (rtnl_rtprot_a2n(&prot, *argv))
invarg(*argv, "protocol");
req.r.rtm_protocol = prot;
ok |= proto_ok;
#if ENABLE_FEATURE_IP_RULE
} else if (arg == ARG_table) {
uint32_t tid;
NEXT_ARG();
if (rtnl_rttable_a2n(&tid, *argv))
invarg(*argv, "table");
req.r.rtm_table = tid;
#endif
} else if (arg == ARG_dev || arg == ARG_oif) {
NEXT_ARG();
d = *argv;
} else {
int type;
inet_prefix dst;
if (arg == ARG_to) {
NEXT_ARG();
}
if ((**argv < '0' || **argv > '9')
&& rtnl_rtntype_a2n(&type, *argv) == 0) {
NEXT_ARG();
req.r.rtm_type = type;
ok |= type_ok;
}
if (ok & dst_ok) {
duparg2("to", *argv);
}
get_prefix(&dst, *argv, req.r.rtm_family);
if (req.r.rtm_family == AF_UNSPEC) {
req.r.rtm_family = dst.family;
}
req.r.rtm_dst_len = dst.bitlen;
ok |= dst_ok;
if (dst.bytelen) {
addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
}
}
argv++;
}
xrtnl_open(&rth);
if (d) {
int idx;
ll_init_map(&rth);
if (d) {
idx = xll_name_to_index(d);
addattr32(&req.n, sizeof(req), RTA_OIF, idx);
}
}
if (mxrta->rta_len > RTA_LENGTH(0)) {
if (mxlock) {
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
}
addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
}
if (req.r.rtm_type == RTN_LOCAL || req.r.rtm_type == RTN_NAT)
req.r.rtm_scope = RT_SCOPE_HOST;
else if (req.r.rtm_type == RTN_BROADCAST ||
req.r.rtm_type == RTN_MULTICAST ||
req.r.rtm_type == RTN_ANYCAST)
req.r.rtm_scope = RT_SCOPE_LINK;
else if (req.r.rtm_type == RTN_UNICAST || req.r.rtm_type == RTN_UNSPEC) {
if (cmd == RTM_DELROUTE)
req.r.rtm_scope = RT_SCOPE_NOWHERE;
else if (!(ok & gw_ok))
req.r.rtm_scope = RT_SCOPE_LINK;
}
if (req.r.rtm_family == AF_UNSPEC) {
req.r.rtm_family = AF_INET;
}
if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) {
return 2;
}
return 0;
}
static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
{
struct {
struct nlmsghdr nlh;
struct rtmsg rtm;
} req;
struct sockaddr_nl nladdr;
memset(&nladdr, 0, sizeof(nladdr));
memset(&req, 0, sizeof(req));
nladdr.nl_family = AF_NETLINK;
req.nlh.nlmsg_len = sizeof(req);
req.nlh.nlmsg_type = RTM_GETROUTE;
req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_REQUEST;
req.nlh.nlmsg_pid = 0;
req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
req.rtm.rtm_family = family;
req.rtm.rtm_flags |= RTM_F_CLONED;
return xsendto(rth->fd, (void*)&req, sizeof(req), (struct sockaddr*)&nladdr, sizeof(nladdr));
}
static void iproute_flush_cache(void)
{
static const char fn[] ALIGN1 = "/proc/sys/net/ipv4/route/flush";
int flush_fd = open_or_warn(fn, O_WRONLY);
if (flush_fd < 0) {
return;
}
if (write(flush_fd, "-1", 2) < 2) {
bb_perror_msg("cannot flush routing cache");
return;
}
close(flush_fd);
}
static void iproute_reset_filter(void)
{
memset(&filter, 0, sizeof(filter));
filter.mdst.bitlen = -1;
filter.msrc.bitlen = -1;
}
/* Return value becomes exitcode. It's okay to not return at all */
static int iproute_list_or_flush(char **argv, int flush)
{
int do_ipv6 = preferred_family;
struct rtnl_handle rth;
char *id = NULL;
char *od = NULL;
static const char keywords[] ALIGN1 =
/* "ip route list/flush" parameters: */
"protocol\0" "dev\0" "oif\0" "iif\0"
"via\0" "table\0" "cache\0"
"from\0" "to\0"
/* and possible further keywords */
"all\0"
"root\0"
"match\0"
"exact\0"
"main\0"
;
enum {
KW_proto, KW_dev, KW_oif, KW_iif,
KW_via, KW_table, KW_cache,
KW_from, KW_to,
/* */
KW_all,
KW_root,
KW_match,
KW_exact,
KW_main,
};
int arg, parm;
iproute_reset_filter();
filter.tb = RT_TABLE_MAIN;
if (flush && !*argv)
bb_error_msg_and_die(bb_msg_requires_arg, "\"ip route flush\"");
while (*argv) {
arg = index_in_substrings(keywords, *argv);
if (arg == KW_proto) {
uint32_t prot = 0;
NEXT_ARG();
filter.protocolmask = -1;
if (rtnl_rtprot_a2n(&prot, *argv)) {
if (index_in_strings(keywords, *argv) != KW_all)
invarg(*argv, "protocol");
prot = 0;
filter.protocolmask = 0;
}
filter.protocol = prot;
} else if (arg == KW_dev || arg == KW_oif) {
NEXT_ARG();
od = *argv;
} else if (arg == KW_iif) {
NEXT_ARG();
id = *argv;
} else if (arg == KW_via) {
NEXT_ARG();
get_prefix(&filter.rvia, *argv, do_ipv6);
} else if (arg == KW_table) { /* table all/cache/main */
NEXT_ARG();
parm = index_in_substrings(keywords, *argv);
if (parm == KW_cache)
filter.tb = -1;
else if (parm == KW_all)
filter.tb = 0;
else if (parm != KW_main)
invarg(*argv, "table");
} else if (arg == KW_cache) {
/* The command 'ip route flush cache' is used by OpenSWAN.
* Assuming it's a synonym for 'ip route flush table cache' */
filter.tb = -1;
} else if (arg == KW_from) {
NEXT_ARG();
parm = index_in_substrings(keywords, *argv);
if (parm == KW_root) {
NEXT_ARG();
get_prefix(&filter.rsrc, *argv, do_ipv6);
} else if (parm == KW_match) {
NEXT_ARG();
get_prefix(&filter.msrc, *argv, do_ipv6);
} else {
if (parm == KW_exact)
NEXT_ARG();
get_prefix(&filter.msrc, *argv, do_ipv6);
filter.rsrc = filter.msrc;
}
} else { /* "to" is the default parameter */
if (arg == KW_to) {
NEXT_ARG();
arg = index_in_substrings(keywords, *argv);
}
/* parm = arg; - would be more plausible, but we reuse 'arg' here */
if (arg == KW_root) {
NEXT_ARG();
get_prefix(&filter.rdst, *argv, do_ipv6);
} else if (arg == KW_match) {
NEXT_ARG();
get_prefix(&filter.mdst, *argv, do_ipv6);
} else { /* "to exact" is the default */
if (arg == KW_exact)
NEXT_ARG();
get_prefix(&filter.mdst, *argv, do_ipv6);
filter.rdst = filter.mdst;
}
}
argv++;
}
if (do_ipv6 == AF_UNSPEC && filter.tb) {
do_ipv6 = AF_INET;
}
xrtnl_open(&rth);
ll_init_map(&rth);
if (id || od) {
int idx;
if (id) {
idx = xll_name_to_index(id);
filter.iif = idx;
filter.iifmask = -1;
}
if (od) {
idx = xll_name_to_index(od);
filter.oif = idx;
filter.oifmask = -1;
}
}
if (flush) {
char flushb[4096-512];
if (filter.tb == -1) { /* "flush table cache" */
if (do_ipv6 != AF_INET6)
iproute_flush_cache();
if (do_ipv6 == AF_INET)
return 0;
}
filter.flushb = flushb;
filter.flushp = 0;
filter.flushe = sizeof(flushb);
filter.rth = &rth;
for (;;) {
xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
filter.flushed = 0;
xrtnl_dump_filter(&rth, print_route, stdout);
if (filter.flushed == 0)
return 0;
if (flush_update())
return 1;
}
}
if (filter.tb != -1) {
xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
} else if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
bb_perror_msg_and_die("cannot send dump request");
}
xrtnl_dump_filter(&rth, print_route, stdout);
return 0;
}
/* Return value becomes exitcode. It's okay to not return at all */
static int iproute_get(char **argv)
{
struct rtnl_handle rth;
struct {
struct nlmsghdr n;
struct rtmsg r;
char buf[1024];
} req;
char *idev = NULL;
char *odev = NULL;
bool connected = 0;
bool from_ok = 0;
static const char options[] ALIGN1 =
"from\0""iif\0""oif\0""dev\0""notify\0""connected\0""to\0";
memset(&req, 0, sizeof(req));
iproute_reset_filter();
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
req.n.nlmsg_flags = NLM_F_REQUEST;
req.n.nlmsg_type = RTM_GETROUTE;
req.r.rtm_family = preferred_family;
req.r.rtm_table = 0;
req.r.rtm_protocol = 0;
req.r.rtm_scope = 0;
req.r.rtm_type = 0;
req.r.rtm_src_len = 0;
req.r.rtm_dst_len = 0;
req.r.rtm_tos = 0;
while (*argv) {
switch (index_in_strings(options, *argv)) {
case 0: /* from */
{
inet_prefix addr;
NEXT_ARG();
from_ok = 1;
get_prefix(&addr, *argv, req.r.rtm_family);
if (req.r.rtm_family == AF_UNSPEC) {
req.r.rtm_family = addr.family;
}
if (addr.bytelen) {
addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
}
req.r.rtm_src_len = addr.bitlen;
break;
}
case 1: /* iif */
NEXT_ARG();
idev = *argv;
break;
case 2: /* oif */
case 3: /* dev */
NEXT_ARG();
odev = *argv;
break;
case 4: /* notify */
req.r.rtm_flags |= RTM_F_NOTIFY;
break;
case 5: /* connected */
connected = 1;
break;
case 6: /* to */
NEXT_ARG();
default:
{
inet_prefix addr;
get_prefix(&addr, *argv, req.r.rtm_family);
if (req.r.rtm_family == AF_UNSPEC) {
req.r.rtm_family = addr.family;
}
if (addr.bytelen) {
addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
}
req.r.rtm_dst_len = addr.bitlen;
}
argv++;
}
}
if (req.r.rtm_dst_len == 0) {
bb_error_msg_and_die("need at least destination address");
}
xrtnl_open(&rth);
ll_init_map(&rth);
if (idev || odev) {
int idx;
if (idev) {
idx = xll_name_to_index(idev);
addattr32(&req.n, sizeof(req), RTA_IIF, idx);
}
if (odev) {
idx = xll_name_to_index(odev);
addattr32(&req.n, sizeof(req), RTA_OIF, idx);
}
}
if (req.r.rtm_family == AF_UNSPEC) {
req.r.rtm_family = AF_INET;
}
if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
return 2;
}
if (connected && !from_ok) {
struct rtmsg *r = NLMSG_DATA(&req.n);
int len = req.n.nlmsg_len;
struct rtattr * tb[RTA_MAX+1];
print_route(NULL, &req.n, (void*)stdout);
if (req.n.nlmsg_type != RTM_NEWROUTE) {
bb_error_msg_and_die("not a route?");
}
len -= NLMSG_LENGTH(sizeof(*r));
if (len < 0) {
bb_error_msg_and_die("wrong len %d", len);
}
memset(tb, 0, sizeof(tb));
parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
if (tb[RTA_PREFSRC]) {
tb[RTA_PREFSRC]->rta_type = RTA_SRC;
r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
} else if (!tb[RTA_SRC]) {
bb_error_msg_and_die("failed to connect the route");
}
if (!odev && tb[RTA_OIF]) {
tb[RTA_OIF]->rta_type = 0;
}
if (tb[RTA_GATEWAY]) {
tb[RTA_GATEWAY]->rta_type = 0;
}
if (!idev && tb[RTA_IIF]) {
tb[RTA_IIF]->rta_type = 0;
}
req.n.nlmsg_flags = NLM_F_REQUEST;
req.n.nlmsg_type = RTM_GETROUTE;
if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
return 2;
}
}
print_route(NULL, &req.n, (void*)stdout);
return 0;
}
/* Return value becomes exitcode. It's okay to not return at all */
int do_iproute(char **argv)
{
static const char ip_route_commands[] ALIGN1 =
/*0-3*/ "add\0""append\0""change\0""chg\0"
/*4-7*/ "delete\0""get\0""list\0""show\0"
/*8..*/ "prepend\0""replace\0""test\0""flush\0";
int command_num;
unsigned flags = 0;
int cmd = RTM_NEWROUTE;
if (!*argv)
return iproute_list_or_flush(argv, 0);
/* "Standard" 'ip r a' treats 'a' as 'add', not 'append' */
/* It probably means that it is using "first match" rule */
command_num = index_in_substrings(ip_route_commands, *argv);
switch (command_num) {
case 0: /* add */
flags = NLM_F_CREATE|NLM_F_EXCL;
break;
case 1: /* append */
flags = NLM_F_CREATE|NLM_F_APPEND;
break;
case 2: /* change */
case 3: /* chg */
flags = NLM_F_REPLACE;
break;
case 4: /* delete */
cmd = RTM_DELROUTE;
break;
case 5: /* get */
return iproute_get(argv+1);
case 6: /* list */
case 7: /* show */
return iproute_list_or_flush(argv+1, 0);
case 8: /* prepend */
flags = NLM_F_CREATE;
break;
case 9: /* replace */
flags = NLM_F_CREATE|NLM_F_REPLACE;
break;
case 10: /* test */
flags = NLM_F_EXCL;
break;
case 11: /* flush */
return iproute_list_or_flush(argv+1, 1);
default:
bb_error_msg_and_die("unknown command %s", *argv);
}
return iproute_modify(cmd, flags, argv+1);
}
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