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aosp12/external/iproute2/ip/iproute.c

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/*
* iproute.c "ip route".
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <fcntl.h>
#include <string.h>
#include <time.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <linux/in_route.h>
#include <linux/icmpv6.h>
#include <errno.h>
#include "rt_names.h"
#include "utils.h"
#include "ip_common.h"
#include "iproute_lwtunnel.h"
#ifndef RTAX_RTTVAR
#define RTAX_RTTVAR RTAX_HOPS
#endif
enum list_action {
IPROUTE_LIST,
IPROUTE_FLUSH,
IPROUTE_SAVE,
};
static const char *mx_names[RTAX_MAX+1] = {
[RTAX_MTU] = "mtu",
[RTAX_WINDOW] = "window",
[RTAX_RTT] = "rtt",
[RTAX_RTTVAR] = "rttvar",
[RTAX_SSTHRESH] = "ssthresh",
[RTAX_CWND] = "cwnd",
[RTAX_ADVMSS] = "advmss",
[RTAX_REORDERING] = "reordering",
[RTAX_HOPLIMIT] = "hoplimit",
[RTAX_INITCWND] = "initcwnd",
[RTAX_FEATURES] = "features",
[RTAX_RTO_MIN] = "rto_min",
[RTAX_INITRWND] = "initrwnd",
[RTAX_QUICKACK] = "quickack",
[RTAX_CC_ALGO] = "congctl",
};
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
fprintf(stderr, "Usage: ip route { list | flush } SELECTOR\n");
fprintf(stderr, " ip route save SELECTOR\n");
fprintf(stderr, " ip route restore\n");
fprintf(stderr, " ip route showdump\n");
fprintf(stderr, " ip route get [ ROUTE_GET_FLAGS ] ADDRESS\n");
fprintf(stderr, " [ from ADDRESS iif STRING ]\n");
fprintf(stderr, " [ oif STRING ] [ tos TOS ]\n");
fprintf(stderr, " [ mark NUMBER ] [ vrf NAME ]\n");
fprintf(stderr, " [ uid NUMBER ]\n");
fprintf(stderr, " ip route { add | del | change | append | replace } ROUTE\n");
fprintf(stderr, "SELECTOR := [ root PREFIX ] [ match PREFIX ] [ exact PREFIX ]\n");
fprintf(stderr, " [ table TABLE_ID ] [ vrf NAME ] [ proto RTPROTO ]\n");
fprintf(stderr, " [ type TYPE ] [ scope SCOPE ]\n");
fprintf(stderr, "ROUTE := NODE_SPEC [ INFO_SPEC ]\n");
fprintf(stderr, "NODE_SPEC := [ TYPE ] PREFIX [ tos TOS ]\n");
fprintf(stderr, " [ table TABLE_ID ] [ proto RTPROTO ]\n");
fprintf(stderr, " [ scope SCOPE ] [ metric METRIC ]\n");
fprintf(stderr, " [ ttl-propagate { enabled | disabled } ]\n");
fprintf(stderr, "INFO_SPEC := NH OPTIONS FLAGS [ nexthop NH ]...\n");
fprintf(stderr, "NH := [ encap ENCAPTYPE ENCAPHDR ] [ via [ FAMILY ] ADDRESS ]\n");
fprintf(stderr, " [ dev STRING ] [ weight NUMBER ] NHFLAGS\n");
fprintf(stderr, "FAMILY := [ inet | inet6 | ipx | dnet | mpls | bridge | link ]\n");
fprintf(stderr, "OPTIONS := FLAGS [ mtu NUMBER ] [ advmss NUMBER ] [ as [ to ] ADDRESS ]\n");
fprintf(stderr, " [ rtt TIME ] [ rttvar TIME ] [ reordering NUMBER ]\n");
fprintf(stderr, " [ window NUMBER ] [ cwnd NUMBER ] [ initcwnd NUMBER ]\n");
fprintf(stderr, " [ ssthresh NUMBER ] [ realms REALM ] [ src ADDRESS ]\n");
fprintf(stderr, " [ rto_min TIME ] [ hoplimit NUMBER ] [ initrwnd NUMBER ]\n");
fprintf(stderr, " [ features FEATURES ] [ quickack BOOL ] [ congctl NAME ]\n");
fprintf(stderr, " [ pref PREF ] [ expires TIME ]\n");
fprintf(stderr, "TYPE := { unicast | local | broadcast | multicast | throw |\n");
fprintf(stderr, " unreachable | prohibit | blackhole | nat }\n");
fprintf(stderr, "TABLE_ID := [ local | main | default | all | NUMBER ]\n");
fprintf(stderr, "SCOPE := [ host | link | global | NUMBER ]\n");
fprintf(stderr, "NHFLAGS := [ onlink | pervasive ]\n");
fprintf(stderr, "RTPROTO := [ kernel | boot | static | NUMBER ]\n");
fprintf(stderr, "PREF := [ low | medium | high ]\n");
fprintf(stderr, "TIME := NUMBER[s|ms]\n");
fprintf(stderr, "BOOL := [1|0]\n");
fprintf(stderr, "FEATURES := ecn\n");
fprintf(stderr, "ENCAPTYPE := [ mpls | ip | ip6 | seg6 | seg6local ]\n");
fprintf(stderr, "ENCAPHDR := [ MPLSLABEL | SEG6HDR ]\n");
fprintf(stderr, "SEG6HDR := [ mode SEGMODE ] segs ADDR1,ADDRi,ADDRn [hmac HMACKEYID] [cleanup]\n");
fprintf(stderr, "SEGMODE := [ encap | inline ]\n");
fprintf(stderr, "ROUTE_GET_FLAGS := [ fibmatch ]\n");
exit(-1);
}
static struct
{
unsigned int tb;
int cloned;
int flushed;
char *flushb;
int flushp;
int flushe;
int protocol, protocolmask;
int scope, scopemask;
__u64 typemask;
int tos, tosmask;
int iif, iifmask;
int oif, oifmask;
int mark, markmask;
int realm, realmmask;
inet_prefix rprefsrc;
inet_prefix rvia;
inet_prefix rdst;
inet_prefix mdst;
inet_prefix rsrc;
inet_prefix msrc;
} filter;
static int flush_update(void)
{
if (rtnl_send_check(&rth, filter.flushb, filter.flushp) < 0) {
perror("Failed to send flush request");
return -2;
}
filter.flushp = 0;
return 0;
}
static int filter_nlmsg(struct nlmsghdr *n, struct rtattr **tb, int host_len)
{
struct rtmsg *r = NLMSG_DATA(n);
inet_prefix dst = { .family = r->rtm_family };
inet_prefix src = { .family = r->rtm_family };
inet_prefix via = { .family = r->rtm_family };
inet_prefix prefsrc = { .family = r->rtm_family };
__u32 table;
static int ip6_multiple_tables;
table = rtm_get_table(r, tb);
if (preferred_family != AF_UNSPEC && r->rtm_family != preferred_family)
return 0;
if (r->rtm_family == AF_INET6 && table != RT_TABLE_MAIN)
ip6_multiple_tables = 1;
if (filter.cloned == !(r->rtm_flags&RTM_F_CLONED))
return 0;
if (r->rtm_family == AF_INET6 && !ip6_multiple_tables) {
if (filter.tb) {
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 != table)
return 0;
}
if ((filter.protocol^r->rtm_protocol)&filter.protocolmask)
return 0;
if ((filter.scope^r->rtm_scope)&filter.scopemask)
return 0;
if (filter.typemask && !(filter.typemask & (1 << r->rtm_type)))
return 0;
if ((filter.tos^r->rtm_tos)&filter.tosmask)
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;
if (filter.rvia.family) {
int family = r->rtm_family;
if (tb[RTA_VIA]) {
struct rtvia *via = RTA_DATA(tb[RTA_VIA]);
family = via->rtvia_family;
}
if (family != filter.rvia.family)
return 0;
}
if (filter.rprefsrc.family && r->rtm_family != filter.rprefsrc.family)
return 0;
if (tb[RTA_DST])
memcpy(&dst.data, RTA_DATA(tb[RTA_DST]), (r->rtm_dst_len+7)/8);
if (filter.rsrc.family || filter.msrc.family) {
if (tb[RTA_SRC])
memcpy(&src.data, RTA_DATA(tb[RTA_SRC]), (r->rtm_src_len+7)/8);
}
if (filter.rvia.bitlen > 0) {
if (tb[RTA_GATEWAY])
memcpy(&via.data, RTA_DATA(tb[RTA_GATEWAY]), host_len/8);
if (tb[RTA_VIA]) {
size_t len = RTA_PAYLOAD(tb[RTA_VIA]) - 2;
struct rtvia *rtvia = RTA_DATA(tb[RTA_VIA]);
via.family = rtvia->rtvia_family;
memcpy(&via.data, rtvia->rtvia_addr, len);
}
}
if (filter.rprefsrc.bitlen > 0) {
if (tb[RTA_PREFSRC])
memcpy(&prefsrc.data, RTA_DATA(tb[RTA_PREFSRC]), host_len/8);
}
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.rvia.family && inet_addr_match(&via, &filter.rvia, filter.rvia.bitlen))
return 0;
if (filter.rprefsrc.family && inet_addr_match(&prefsrc, &filter.rprefsrc, filter.rprefsrc.bitlen))
return 0;
if (filter.realmmask) {
__u32 realms = 0;
if (tb[RTA_FLOW])
realms = rta_getattr_u32(tb[RTA_FLOW]);
if ((realms^filter.realm)&filter.realmmask)
return 0;
}
if (filter.iifmask) {
int iif = 0;
if (tb[RTA_IIF])
iif = rta_getattr_u32(tb[RTA_IIF]);
if ((iif^filter.iif)&filter.iifmask)
return 0;
}
if (filter.oifmask) {
int oif = 0;
if (tb[RTA_OIF])
oif = rta_getattr_u32(tb[RTA_OIF]);
if ((oif^filter.oif)&filter.oifmask)
return 0;
}
if (filter.markmask) {
int mark = 0;
if (tb[RTA_MARK])
mark = rta_getattr_u32(tb[RTA_MARK]);
if ((mark ^ filter.mark) & filter.markmask)
return 0;
}
if (filter.flushb &&
r->rtm_family == AF_INET6 &&
r->rtm_dst_len == 0 &&
r->rtm_type == RTN_UNREACHABLE &&
tb[RTA_PRIORITY] &&
rta_getattr_u32(tb[RTA_PRIORITY]) == -1)
return 0;
return 1;
}
static void print_rtax_features(FILE *fp, unsigned int features)
{
unsigned int of = features;
if (features & RTAX_FEATURE_ECN) {
fprintf(fp, "ecn ");
features &= ~RTAX_FEATURE_ECN;
}
if (features)
fprintf(fp, "0x%x ", of);
}
int print_route(const struct sockaddr_nl *who, 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];
int host_len, family;
__u32 table;
int ret;
SPRINT_BUF(b1);
static int hz;
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 -1;
}
if (filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
return 0;
len -= NLMSG_LENGTH(sizeof(*r));
if (len < 0) {
fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
return -1;
}
host_len = af_bit_len(r->rtm_family);
parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
table = rtm_get_table(r, tb);
if (!filter_nlmsg(n, tb, host_len))
return 0;
if (filter.flushb) {
struct nlmsghdr *fn;
if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
if ((ret = flush_update()) < 0)
return ret;
}
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 = ++rth.seq;
filter.flushp = (((char *)fn) + n->nlmsg_len) - filter.flushb;
filter.flushed++;
if (show_stats < 2)
return 0;
}
if (n->nlmsg_type == RTM_DELROUTE)
fprintf(fp, "Deleted ");
if ((r->rtm_type != RTN_UNICAST || show_details > 0) &&
(!filter.typemask || (filter.typemask & (1 << r->rtm_type))))
fprintf(fp, "%s ", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
if (tb[RTA_DST]) {
family = get_real_family(r->rtm_type, r->rtm_family);
if (r->rtm_dst_len != host_len) {
fprintf(fp, "%s/%u ",
rt_addr_n2a_rta(family, tb[RTA_DST]),
r->rtm_dst_len);
} else {
fprintf(fp, "%s ",
format_host_rta(family, tb[RTA_DST]));
}
} else if (r->rtm_dst_len) {
fprintf(fp, "0/%d ", r->rtm_dst_len);
} else {
fprintf(fp, "default ");
}
if (tb[RTA_SRC]) {
family = get_real_family(r->rtm_type, r->rtm_family);
if (r->rtm_src_len != host_len) {
fprintf(fp, "from %s/%u ",
rt_addr_n2a_rta(family, tb[RTA_SRC]),
r->rtm_src_len);
} else {
fprintf(fp, "from %s ",
format_host_rta(family, tb[RTA_SRC]));
}
} else if (r->rtm_src_len) {
fprintf(fp, "from 0/%u ", r->rtm_src_len);
}
if (tb[RTA_NEWDST]) {
fprintf(fp, "as to %s ",
format_host_rta(r->rtm_family, tb[RTA_NEWDST]));
}
if (tb[RTA_ENCAP])
lwt_print_encap(fp, tb[RTA_ENCAP_TYPE], tb[RTA_ENCAP]);
if (r->rtm_tos && filter.tosmask != -1) {
SPRINT_BUF(b1);
fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
}
if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len) {
fprintf(fp, "via %s ",
format_host_rta(r->rtm_family, tb[RTA_GATEWAY]));
}
if (tb[RTA_VIA]) {
size_t len = RTA_PAYLOAD(tb[RTA_VIA]) - 2;
struct rtvia *via = RTA_DATA(tb[RTA_VIA]);
fprintf(fp, "via %s %s ",
family_name(via->rtvia_family),
format_host(via->rtvia_family, len, via->rtvia_addr));
}
if (tb[RTA_OIF] && filter.oifmask != -1)
fprintf(fp, "dev %s ", ll_index_to_name(rta_getattr_u32(tb[RTA_OIF])));
if (table && (table != RT_TABLE_MAIN || show_details > 0) && !filter.tb)
fprintf(fp, "table %s ", rtnl_rttable_n2a(table, b1, sizeof(b1)));
if (!(r->rtm_flags&RTM_F_CLONED)) {
if ((r->rtm_protocol != RTPROT_BOOT || show_details > 0) && filter.protocolmask != -1)
fprintf(fp, "proto %s ", rtnl_rtprot_n2a(r->rtm_protocol, b1, sizeof(b1)));
if ((r->rtm_scope != RT_SCOPE_UNIVERSE || show_details > 0) && filter.scopemask != -1)
fprintf(fp, "scope %s ", rtnl_rtscope_n2a(r->rtm_scope, b1, sizeof(b1)));
}
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_rta(r->rtm_family, tb[RTA_PREFSRC]));
}
if (tb[RTA_PRIORITY])
fprintf(fp, "metric %u ", rta_getattr_u32(tb[RTA_PRIORITY]));
if (r->rtm_flags & RTNH_F_DEAD)
fprintf(fp, "dead ");
if (r->rtm_flags & RTNH_F_ONLINK)
fprintf(fp, "onlink ");
if (r->rtm_flags & RTNH_F_PERVASIVE)
fprintf(fp, "pervasive ");
if (r->rtm_flags & RTNH_F_OFFLOAD)
fprintf(fp, "offload ");
if (r->rtm_flags & RTM_F_NOTIFY)
fprintf(fp, "notify ");
if (r->rtm_flags & RTNH_F_LINKDOWN)
fprintf(fp, "linkdown ");
if (r->rtm_flags & RTNH_F_UNRESOLVED)
fprintf(fp, "unresolved ");
if (tb[RTA_MARK]) {
unsigned int mark = rta_getattr_u32(tb[RTA_MARK]);
if (mark) {
if (mark >= 16)
fprintf(fp, "mark 0x%x ", mark);
else
fprintf(fp, "mark %u ", mark);
}
}
if (tb[RTA_FLOW] && filter.realmmask != ~0U) {
__u32 to = rta_getattr_u32(tb[RTA_FLOW]);
__u32 from = to>>16;
to &= 0xFFFF;
fprintf(fp, "realm%s ", from ? "s" : "");
if (from) {
fprintf(fp, "%s/",
rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
}
fprintf(fp, "%s ",
rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
}
if (tb[RTA_UID])
fprintf(fp, "uid %u ", rta_getattr_u32(tb[RTA_UID]));
if ((r->rtm_flags&RTM_F_CLONED) && r->rtm_family == AF_INET) {
__u32 flags = r->rtm_flags&~0xFFFF;
int first = 1;
fprintf(fp, "%s cache ", _SL_);
#define PRTFL(fl, flname) if (flags&RTCF_##fl) { \
flags &= ~RTCF_##fl; \
fprintf(fp, "%s" flname "%s", first ? "<" : "", flags ? "," : "> "); \
first = 0; }
PRTFL(LOCAL, "local");
PRTFL(REJECT, "reject");
PRTFL(MULTICAST, "mc");
PRTFL(BROADCAST, "brd");
PRTFL(DNAT, "dst-nat");
PRTFL(SNAT, "src-nat");
PRTFL(MASQ, "masq");
PRTFL(DIRECTDST, "dst-direct");
PRTFL(DIRECTSRC, "src-direct");
PRTFL(REDIRECTED, "redirected");
PRTFL(DOREDIRECT, "redirect");
PRTFL(FAST, "fastroute");
PRTFL(NOTIFY, "notify");
PRTFL(TPROXY, "proxy");
if (flags)
fprintf(fp, "%s%x> ", first ? "<" : "", flags);
if (tb[RTA_CACHEINFO]) {
struct rta_cacheinfo *ci = RTA_DATA(tb[RTA_CACHEINFO]);
if (!hz)
hz = get_user_hz();
if (ci->rta_expires != 0)
fprintf(fp, "expires %dsec ", ci->rta_expires/hz);
if (ci->rta_error != 0)
fprintf(fp, "error %d ", ci->rta_error);
if (show_stats) {
if (ci->rta_clntref)
fprintf(fp, "users %d ", ci->rta_clntref);
if (ci->rta_used != 0)
fprintf(fp, "used %d ", ci->rta_used);
if (ci->rta_lastuse != 0)
fprintf(fp, "age %dsec ", ci->rta_lastuse/hz);
}
if (ci->rta_id)
fprintf(fp, "ipid 0x%04x ", ci->rta_id);
if (ci->rta_ts || ci->rta_tsage)
fprintf(fp, "ts 0x%x tsage %dsec ",
ci->rta_ts, ci->rta_tsage);
}
} else 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 (!hz)
hz = get_user_hz();
if (r->rtm_flags & RTM_F_CLONED)
fprintf(fp, "%s cache ", _SL_);
if (ci->rta_expires)
fprintf(fp, "expires %dsec ", ci->rta_expires/hz);
if (ci->rta_error != 0)
fprintf(fp, "error %d ", ci->rta_error);
if (show_stats) {
if (ci->rta_clntref)
fprintf(fp, "users %d ", ci->rta_clntref);
if (ci->rta_used != 0)
fprintf(fp, "used %d ", ci->rta_used);
if (ci->rta_lastuse != 0)
fprintf(fp, "age %dsec ", ci->rta_lastuse/hz);
}
} else if (ci) {
if (ci->rta_error != 0)
fprintf(fp, "error %d ", ci->rta_error);
}
}
if (tb[RTA_METRICS]) {
int i;
unsigned int mxlock = 0;
struct rtattr *mxrta[RTAX_MAX+1];
parse_rtattr(mxrta, RTAX_MAX, RTA_DATA(tb[RTA_METRICS]),
RTA_PAYLOAD(tb[RTA_METRICS]));
if (mxrta[RTAX_LOCK])
mxlock = rta_getattr_u32(mxrta[RTAX_LOCK]);
for (i = 2; i <= RTAX_MAX; i++) {
__u32 val = 0U;
if (mxrta[i] == NULL && !(mxlock & (1 << i)))
continue;
if (mxrta[i] != NULL && i != RTAX_CC_ALGO)
val = rta_getattr_u32(mxrta[i]);
if (i == RTAX_HOPLIMIT && (int)val == -1)
continue;
if (i < sizeof(mx_names)/sizeof(char *) && mx_names[i])
fprintf(fp, "%s ", mx_names[i]);
else
fprintf(fp, "metric %d ", i);
if (mxlock & (1<<i))
fprintf(fp, "lock ");
switch (i) {
case RTAX_FEATURES:
print_rtax_features(fp, val);
break;
default:
fprintf(fp, "%u ", val);
break;
case RTAX_RTT:
case RTAX_RTTVAR:
case RTAX_RTO_MIN:
if (i == RTAX_RTT)
val /= 8;
else if (i == RTAX_RTTVAR)
val /= 4;
if (val >= 1000)
fprintf(fp, "%gs ", val/1e3);
else
fprintf(fp, "%ums ", val);
break;
case RTAX_CC_ALGO:
fprintf(fp, "%s ", rta_getattr_str(mxrta[i]));
break;
}
}
}
if (tb[RTA_IIF] && filter.iifmask != -1) {
fprintf(fp, "iif %s ",
ll_index_to_name(rta_getattr_u32(tb[RTA_IIF])));
}
if (tb[RTA_MULTIPATH]) {
struct rtnexthop *nh = RTA_DATA(tb[RTA_MULTIPATH]);
int first = 1;
len = RTA_PAYLOAD(tb[RTA_MULTIPATH]);
for (;;) {
if (len < sizeof(*nh))
break;
if (nh->rtnh_len > len)
break;
if (r->rtm_flags&RTM_F_CLONED && r->rtm_type == RTN_MULTICAST) {
if (first) {
fprintf(fp, "Oifs: ");
first = 0;
} else {
fprintf(fp, " ");
}
} else
fprintf(fp, "%s\tnexthop ", _SL_);
if (nh->rtnh_len > sizeof(*nh)) {
parse_rtattr(tb, RTA_MAX, RTNH_DATA(nh), nh->rtnh_len - sizeof(*nh));
if (tb[RTA_ENCAP])
lwt_print_encap(fp,
tb[RTA_ENCAP_TYPE],
tb[RTA_ENCAP]);
if (tb[RTA_NEWDST]) {
fprintf(fp, "as to %s ",
format_host_rta(r->rtm_family,
tb[RTA_NEWDST]));
}
if (tb[RTA_GATEWAY]) {
fprintf(fp, "via %s ",
format_host_rta(r->rtm_family,
tb[RTA_GATEWAY]));
}
if (tb[RTA_VIA]) {
size_t len = RTA_PAYLOAD(tb[RTA_VIA]) - 2;
struct rtvia *via = RTA_DATA(tb[RTA_VIA]);
fprintf(fp, "via %s %s ",
family_name(via->rtvia_family),
format_host(via->rtvia_family, len, via->rtvia_addr));
}
if (tb[RTA_FLOW]) {
__u32 to = rta_getattr_u32(tb[RTA_FLOW]);
__u32 from = to>>16;
to &= 0xFFFF;
fprintf(fp, "realm%s ", from ? "s" : "");
if (from) {
fprintf(fp, "%s/",
rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
}
fprintf(fp, "%s ",
rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
}
}
if (r->rtm_flags&RTM_F_CLONED && r->rtm_type == RTN_MULTICAST) {
fprintf(fp, "%s", ll_index_to_name(nh->rtnh_ifindex));
if (nh->rtnh_hops != 1)
fprintf(fp, "(ttl>%d)", nh->rtnh_hops);
fprintf(fp, " ");
} else {
fprintf(fp, "dev %s ", ll_index_to_name(nh->rtnh_ifindex));
if (r->rtm_family != AF_MPLS)
fprintf(fp, "weight %d ",
nh->rtnh_hops+1);
}
if (nh->rtnh_flags & RTNH_F_DEAD)
fprintf(fp, "dead ");
if (nh->rtnh_flags & RTNH_F_ONLINK)
fprintf(fp, "onlink ");
if (nh->rtnh_flags & RTNH_F_PERVASIVE)
fprintf(fp, "pervasive ");
if (nh->rtnh_flags & RTNH_F_OFFLOAD)
fprintf(fp, "offload ");
if (nh->rtnh_flags & RTNH_F_LINKDOWN)
fprintf(fp, "linkdown ");
len -= NLMSG_ALIGN(nh->rtnh_len);
nh = RTNH_NEXT(nh);
}
}
if (tb[RTA_PREF]) {
unsigned int pref = rta_getattr_u8(tb[RTA_PREF]);
fprintf(fp, "pref ");
switch (pref) {
case ICMPV6_ROUTER_PREF_LOW:
fprintf(fp, "low");
break;
case ICMPV6_ROUTER_PREF_MEDIUM:
fprintf(fp, "medium");
break;
case ICMPV6_ROUTER_PREF_HIGH:
fprintf(fp, "high");
break;
default:
fprintf(fp, "%u", pref);
}
}
if (tb[RTA_TTL_PROPAGATE]) {
fprintf(fp, "ttl-propagate ");
if (rta_getattr_u8(tb[RTA_TTL_PROPAGATE]))
fprintf(fp, "enabled");
else
fprintf(fp, "disabled");
}
fprintf(fp, "\n");
fflush(fp);
return 0;
}
static int parse_one_nh(struct nlmsghdr *n, struct rtmsg *r,
struct rtattr *rta, struct rtnexthop *rtnh,
int *argcp, char ***argvp)
{
int argc = *argcp;
char **argv = *argvp;
while (++argv, --argc > 0) {
if (strcmp(*argv, "via") == 0) {
inet_prefix addr;
int family;
NEXT_ARG();
family = read_family(*argv);
if (family == AF_UNSPEC)
family = r->rtm_family;
else
NEXT_ARG();
get_addr(&addr, *argv, family);
if (r->rtm_family == AF_UNSPEC)
r->rtm_family = addr.family;
if (addr.family == r->rtm_family) {
rta_addattr_l(rta, 4096, RTA_GATEWAY, &addr.data, addr.bytelen);
rtnh->rtnh_len += sizeof(struct rtattr) + addr.bytelen;
} else {
rta_addattr_l(rta, 4096, RTA_VIA, &addr.family, addr.bytelen+2);
rtnh->rtnh_len += RTA_SPACE(addr.bytelen+2);
}
} else if (strcmp(*argv, "dev") == 0) {
NEXT_ARG();
if ((rtnh->rtnh_ifindex = ll_name_to_index(*argv)) == 0) {
fprintf(stderr, "Cannot find device \"%s\"\n", *argv);
return -1;
}
} else if (strcmp(*argv, "weight") == 0) {
unsigned int w;
NEXT_ARG();
if (get_unsigned(&w, *argv, 0) || w == 0 || w > 256)
invarg("\"weight\" is invalid\n", *argv);
rtnh->rtnh_hops = w - 1;
} else if (strcmp(*argv, "onlink") == 0) {
rtnh->rtnh_flags |= RTNH_F_ONLINK;
} else if (matches(*argv, "realms") == 0) {
__u32 realm;
NEXT_ARG();
if (get_rt_realms_or_raw(&realm, *argv))
invarg("\"realm\" value is invalid\n", *argv);
rta_addattr32(rta, 4096, RTA_FLOW, realm);
rtnh->rtnh_len += sizeof(struct rtattr) + 4;
} else if (strcmp(*argv, "encap") == 0) {
int len = rta->rta_len;
lwt_parse_encap(rta, 4096, &argc, &argv);
rtnh->rtnh_len += rta->rta_len - len;
} else if (strcmp(*argv, "as") == 0) {
inet_prefix addr;
NEXT_ARG();
if (strcmp(*argv, "to") == 0)
NEXT_ARG();
get_addr(&addr, *argv, r->rtm_family);
rta_addattr_l(rta, 4096, RTA_NEWDST, &addr.data,
addr.bytelen);
rtnh->rtnh_len += sizeof(struct rtattr) + addr.bytelen;
} else
break;
}
*argcp = argc;
*argvp = argv;
return 0;
}
static int parse_nexthops(struct nlmsghdr *n, struct rtmsg *r,
int argc, char **argv)
{
char buf[1024];
struct rtattr *rta = (void *)buf;
struct rtnexthop *rtnh;
rta->rta_type = RTA_MULTIPATH;
rta->rta_len = RTA_LENGTH(0);
rtnh = RTA_DATA(rta);
while (argc > 0) {
if (strcmp(*argv, "nexthop") != 0) {
fprintf(stderr, "Error: \"nexthop\" or end of line is expected instead of \"%s\"\n", *argv);
exit(-1);
}
if (argc <= 1) {
fprintf(stderr, "Error: unexpected end of line after \"nexthop\"\n");
exit(-1);
}
memset(rtnh, 0, sizeof(*rtnh));
rtnh->rtnh_len = sizeof(*rtnh);
rta->rta_len += rtnh->rtnh_len;
parse_one_nh(n, r, rta, rtnh, &argc, &argv);
rtnh = RTNH_NEXT(rtnh);
}
if (rta->rta_len > RTA_LENGTH(0))
addattr_l(n, 1024, RTA_MULTIPATH, RTA_DATA(rta), RTA_PAYLOAD(rta));
return 0;
}
static int iproute_modify(int cmd, unsigned int flags, int argc, char **argv)
{
struct {
struct nlmsghdr n;
struct rtmsg r;
char buf[1024];
} req = {
.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)),
.n.nlmsg_flags = NLM_F_REQUEST | flags,
.n.nlmsg_type = cmd,
.r.rtm_family = preferred_family,
.r.rtm_table = RT_TABLE_MAIN,
.r.rtm_scope = RT_SCOPE_NOWHERE,
};
char mxbuf[256];
struct rtattr *mxrta = (void *)mxbuf;
unsigned int mxlock = 0;
char *d = NULL;
int gw_ok = 0;
int dst_ok = 0;
int nhs_ok = 0;
int scope_ok = 0;
int table_ok = 0;
int raw = 0;
int type_ok = 0;
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 (argc > 0) {
if (strcmp(*argv, "src") == 0) {
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 (strcmp(*argv, "as") == 0) {
inet_prefix addr;
NEXT_ARG();
if (strcmp(*argv, "to") == 0) {
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_NEWDST, &addr.data, addr.bytelen);
} else if (strcmp(*argv, "via") == 0) {
inet_prefix addr;
int family;
if (gw_ok) {
invarg("use nexthop syntax to specify multiple via\n",
*argv);
}
gw_ok = 1;
NEXT_ARG();
family = read_family(*argv);
if (family == AF_UNSPEC)
family = req.r.rtm_family;
else
NEXT_ARG();
get_addr(&addr, *argv, family);
if (req.r.rtm_family == AF_UNSPEC)
req.r.rtm_family = addr.family;
if (addr.family == req.r.rtm_family)
addattr_l(&req.n, sizeof(req), RTA_GATEWAY,
&addr.data, addr.bytelen);
else
addattr_l(&req.n, sizeof(req), RTA_VIA,
&addr.family, addr.bytelen+2);
} else if (strcmp(*argv, "from") == 0) {
inet_prefix addr;
NEXT_ARG();
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;
} else if (strcmp(*argv, "tos") == 0 ||
matches(*argv, "dsfield") == 0) {
__u32 tos;
NEXT_ARG();
if (rtnl_dsfield_a2n(&tos, *argv))
invarg("\"tos\" value is invalid\n", *argv);
req.r.rtm_tos = tos;
} else if (strcmp(*argv, "expires") == 0) {
__u32 expires;
NEXT_ARG();
if (get_u32(&expires, *argv, 0))
invarg("\"expires\" value is invalid\n", *argv);
addattr32(&req.n, sizeof(req), RTA_EXPIRES, expires);
} else if (matches(*argv, "metric") == 0 ||
matches(*argv, "priority") == 0 ||
strcmp(*argv, "preference") == 0) {
__u32 metric;
NEXT_ARG();
if (get_u32(&metric, *argv, 0))
invarg("\"metric\" value is invalid\n", *argv);
addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric);
} else if (strcmp(*argv, "scope") == 0) {
__u32 scope = 0;
NEXT_ARG();
if (rtnl_rtscope_a2n(&scope, *argv))
invarg("invalid \"scope\" value\n", *argv);
req.r.rtm_scope = scope;
scope_ok = 1;
} else if (strcmp(*argv, "mtu") == 0) {
unsigned int mtu;
NEXT_ARG();
if (strcmp(*argv, "lock") == 0) {
mxlock |= (1<<RTAX_MTU);
NEXT_ARG();
}
if (get_unsigned(&mtu, *argv, 0))
invarg("\"mtu\" value is invalid\n", *argv);
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
} else if (strcmp(*argv, "hoplimit") == 0) {
unsigned int hoplimit;
NEXT_ARG();
if (strcmp(*argv, "lock") == 0) {
mxlock |= (1<<RTAX_HOPLIMIT);
NEXT_ARG();
}
if (get_unsigned(&hoplimit, *argv, 0) || hoplimit > 255)
invarg("\"hoplimit\" value is invalid\n", *argv);
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_HOPLIMIT, hoplimit);
} else if (strcmp(*argv, "advmss") == 0) {
unsigned int mss;
NEXT_ARG();
if (strcmp(*argv, "lock") == 0) {
mxlock |= (1<<RTAX_ADVMSS);
NEXT_ARG();
}
if (get_unsigned(&mss, *argv, 0))
invarg("\"mss\" value is invalid\n", *argv);
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_ADVMSS, mss);
} else if (matches(*argv, "reordering") == 0) {
unsigned int reord;
NEXT_ARG();
if (strcmp(*argv, "lock") == 0) {
mxlock |= (1<<RTAX_REORDERING);
NEXT_ARG();
}
if (get_unsigned(&reord, *argv, 0))
invarg("\"reordering\" value is invalid\n", *argv);
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_REORDERING, reord);
} else if (strcmp(*argv, "rtt") == 0) {
unsigned int rtt;
NEXT_ARG();
if (strcmp(*argv, "lock") == 0) {
mxlock |= (1<<RTAX_RTT);
NEXT_ARG();
}
if (get_time_rtt(&rtt, *argv, &raw))
invarg("\"rtt\" value is invalid\n", *argv);
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTT,
(raw) ? rtt : rtt * 8);
} else if (strcmp(*argv, "rto_min") == 0) {
unsigned int rto_min;
NEXT_ARG();
mxlock |= (1<<RTAX_RTO_MIN);
if (get_time_rtt(&rto_min, *argv, &raw))
invarg("\"rto_min\" value is invalid\n",
*argv);
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTO_MIN,
rto_min);
} else if (matches(*argv, "window") == 0) {
unsigned int win;
NEXT_ARG();
if (strcmp(*argv, "lock") == 0) {
mxlock |= (1<<RTAX_WINDOW);
NEXT_ARG();
}
if (get_unsigned(&win, *argv, 0))
invarg("\"window\" value is invalid\n", *argv);
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_WINDOW, win);
} else if (matches(*argv, "cwnd") == 0) {
unsigned int win;
NEXT_ARG();
if (strcmp(*argv, "lock") == 0) {
mxlock |= (1<<RTAX_CWND);
NEXT_ARG();
}
if (get_unsigned(&win, *argv, 0))
invarg("\"cwnd\" value is invalid\n", *argv);
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_CWND, win);
} else if (matches(*argv, "initcwnd") == 0) {
unsigned int win;
NEXT_ARG();
if (strcmp(*argv, "lock") == 0) {
mxlock |= (1<<RTAX_INITCWND);
NEXT_ARG();
}
if (get_unsigned(&win, *argv, 0))
invarg("\"initcwnd\" value is invalid\n", *argv);
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_INITCWND, win);
} else if (matches(*argv, "initrwnd") == 0) {
unsigned int win;
NEXT_ARG();
if (strcmp(*argv, "lock") == 0) {
mxlock |= (1<<RTAX_INITRWND);
NEXT_ARG();
}
if (get_unsigned(&win, *argv, 0))
invarg("\"initrwnd\" value is invalid\n", *argv);
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_INITRWND, win);
} else if (matches(*argv, "features") == 0) {
unsigned int features = 0;
while (argc > 0) {
NEXT_ARG();
if (strcmp(*argv, "ecn") == 0)
features |= RTAX_FEATURE_ECN;
else
invarg("\"features\" value not valid\n", *argv);
break;
}
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_FEATURES, features);
} else if (matches(*argv, "quickack") == 0) {
unsigned int quickack;
NEXT_ARG();
if (get_unsigned(&quickack, *argv, 0))
invarg("\"quickack\" value is invalid\n", *argv);
if (quickack != 1 && quickack != 0)
invarg("\"quickack\" value should be 0 or 1\n", *argv);
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_QUICKACK, quickack);
} else if (matches(*argv, "congctl") == 0) {
NEXT_ARG();
if (strcmp(*argv, "lock") == 0) {
mxlock |= 1 << RTAX_CC_ALGO;
NEXT_ARG();
}
rta_addattr_l(mxrta, sizeof(mxbuf), RTAX_CC_ALGO, *argv,
strlen(*argv));
} else if (matches(*argv, "rttvar") == 0) {
unsigned int win;
NEXT_ARG();
if (strcmp(*argv, "lock") == 0) {
mxlock |= (1<<RTAX_RTTVAR);
NEXT_ARG();
}
if (get_time_rtt(&win, *argv, &raw))
invarg("\"rttvar\" value is invalid\n", *argv);
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTTVAR,
(raw) ? win : win * 4);
} else if (matches(*argv, "ssthresh") == 0) {
unsigned int win;
NEXT_ARG();
if (strcmp(*argv, "lock") == 0) {
mxlock |= (1<<RTAX_SSTHRESH);
NEXT_ARG();
}
if (get_unsigned(&win, *argv, 0))
invarg("\"ssthresh\" value is invalid\n", *argv);
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_SSTHRESH, win);
} else if (matches(*argv, "realms") == 0) {
__u32 realm;
NEXT_ARG();
if (get_rt_realms_or_raw(&realm, *argv))
invarg("\"realm\" value is invalid\n", *argv);
addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
} else if (strcmp(*argv, "onlink") == 0) {
req.r.rtm_flags |= RTNH_F_ONLINK;
} else if (strcmp(*argv, "nexthop") == 0) {
nhs_ok = 1;
break;
} else if (matches(*argv, "protocol") == 0) {
__u32 prot;
NEXT_ARG();
if (rtnl_rtprot_a2n(&prot, *argv))
invarg("\"protocol\" value is invalid\n", *argv);
req.r.rtm_protocol = prot;
} else if (matches(*argv, "table") == 0) {
__u32 tid;
NEXT_ARG();
if (rtnl_rttable_a2n(&tid, *argv))
invarg("\"table\" value is invalid\n", *argv);
if (tid < 256)
req.r.rtm_table = tid;
else {
req.r.rtm_table = RT_TABLE_UNSPEC;
addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
}
table_ok = 1;
} else if (matches(*argv, "vrf") == 0) {
__u32 tid;
NEXT_ARG();
tid = ipvrf_get_table(*argv);
if (tid == 0)
invarg("Invalid VRF\n", *argv);
if (tid < 256)
req.r.rtm_table = tid;
else {
req.r.rtm_table = RT_TABLE_UNSPEC;
addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
}
table_ok = 1;
} else if (strcmp(*argv, "dev") == 0 ||
strcmp(*argv, "oif") == 0) {
NEXT_ARG();
d = *argv;
} else if (matches(*argv, "pref") == 0) {
__u8 pref;
NEXT_ARG();
if (strcmp(*argv, "low") == 0)
pref = ICMPV6_ROUTER_PREF_LOW;
else if (strcmp(*argv, "medium") == 0)
pref = ICMPV6_ROUTER_PREF_MEDIUM;
else if (strcmp(*argv, "high") == 0)
pref = ICMPV6_ROUTER_PREF_HIGH;
else if (get_u8(&pref, *argv, 0))
invarg("\"pref\" value is invalid\n", *argv);
addattr8(&req.n, sizeof(req), RTA_PREF, pref);
} else if (strcmp(*argv, "encap") == 0) {
char buf[1024];
struct rtattr *rta = (void *)buf;
rta->rta_type = RTA_ENCAP;
rta->rta_len = RTA_LENGTH(0);
lwt_parse_encap(rta, sizeof(buf), &argc, &argv);
if (rta->rta_len > RTA_LENGTH(0))
addraw_l(&req.n, 1024, RTA_DATA(rta), RTA_PAYLOAD(rta));
} else if (strcmp(*argv, "ttl-propagate") == 0) {
__u8 ttl_prop;
NEXT_ARG();
if (matches(*argv, "enabled") == 0)
ttl_prop = 1;
else if (matches(*argv, "disabled") == 0)
ttl_prop = 0;
else
invarg("\"ttl-propagate\" value is invalid\n",
*argv);
addattr8(&req.n, sizeof(req), RTA_TTL_PROPAGATE,
ttl_prop);
} else {
int type;
inet_prefix dst;
if (strcmp(*argv, "to") == 0) {
NEXT_ARG();
}
if ((**argv < '0' || **argv > '9') &&
rtnl_rtntype_a2n(&type, *argv) == 0) {
NEXT_ARG();
req.r.rtm_type = type;
type_ok = 1;
}
if (matches(*argv, "help") == 0)
usage();
if (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;
dst_ok = 1;
if (dst.bytelen)
addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
}
argc--; argv++;
}
if (!dst_ok)
usage();
if (d) {
int idx;
if ((idx = ll_name_to_index(d)) == 0) {
fprintf(stderr, "Cannot find device \"%s\"\n", d);
return -1;
}
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 (nhs_ok)
parse_nexthops(&req.n, &req.r, argc, argv);
if (req.r.rtm_family == AF_UNSPEC)
req.r.rtm_family = AF_INET;
if (!table_ok) {
if (req.r.rtm_type == RTN_LOCAL ||
req.r.rtm_type == RTN_BROADCAST ||
req.r.rtm_type == RTN_NAT ||
req.r.rtm_type == RTN_ANYCAST)
req.r.rtm_table = RT_TABLE_LOCAL;
}
if (!scope_ok) {
if (req.r.rtm_family == AF_INET6 ||
req.r.rtm_family == AF_MPLS)
req.r.rtm_scope = RT_SCOPE_UNIVERSE;
else 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 (!gw_ok && !nhs_ok)
req.r.rtm_scope = RT_SCOPE_LINK;
}
}
if (!type_ok && req.r.rtm_family == AF_MPLS)
req.r.rtm_type = RTN_UNICAST;
if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
return -2;
return 0;
}
static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
{
struct {
struct nlmsghdr nlh;
struct rtmsg rtm;
} req = {
.nlh.nlmsg_len = sizeof(req),
.nlh.nlmsg_type = RTM_GETROUTE,
.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_REQUEST,
.nlh.nlmsg_seq = rth->dump = ++rth->seq,
.rtm.rtm_family = family,
.rtm.rtm_flags = RTM_F_CLONED,
};
struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
return sendto(rth->fd, (void *)&req, sizeof(req), 0, (struct sockaddr *)&nladdr, sizeof(nladdr));
}
static int iproute_flush_cache(void)
{
#define ROUTE_FLUSH_PATH "/proc/sys/net/ipv4/route/flush"
int len;
int flush_fd = open(ROUTE_FLUSH_PATH, O_WRONLY);
char *buffer = "-1";
if (flush_fd < 0) {
fprintf(stderr, "Cannot open \"%s\": %s\n",
ROUTE_FLUSH_PATH, strerror(errno));
return -1;
}
len = strlen(buffer);
if ((write(flush_fd, (void *)buffer, len)) < len) {
fprintf(stderr, "Cannot flush routing cache\n");
close(flush_fd);
return -1;
}
close(flush_fd);
return 0;
}
static __u32 route_dump_magic = 0x45311224;
static int save_route(const struct sockaddr_nl *who, struct nlmsghdr *n,
void *arg)
{
int ret;
int len = n->nlmsg_len;
struct rtmsg *r = NLMSG_DATA(n);
struct rtattr *tb[RTA_MAX+1];
int host_len;
host_len = af_bit_len(r->rtm_family);
len -= NLMSG_LENGTH(sizeof(*r));
parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
if (!filter_nlmsg(n, tb, host_len))
return 0;
ret = write(STDOUT_FILENO, n, n->nlmsg_len);
if ((ret > 0) && (ret != n->nlmsg_len)) {
fprintf(stderr, "Short write while saving nlmsg\n");
ret = -EIO;
}
return ret == n->nlmsg_len ? 0 : ret;
}
static int save_route_prep(void)
{
int ret;
if (isatty(STDOUT_FILENO)) {
fprintf(stderr, "Not sending a binary stream to stdout\n");
return -1;
}
ret = write(STDOUT_FILENO, &route_dump_magic, sizeof(route_dump_magic));
if (ret != sizeof(route_dump_magic)) {
fprintf(stderr, "Can't write magic to dump file\n");
return -1;
}
return 0;
}
static int iproute_list_flush_or_save(int argc, char **argv, int action)
{
int do_ipv6 = preferred_family;
char *id = NULL;
char *od = NULL;
unsigned int mark = 0;
rtnl_filter_t filter_fn;
int ret;
if (action == IPROUTE_SAVE) {
if (save_route_prep())
return -1;
filter_fn = save_route;
} else
filter_fn = print_route;
iproute_reset_filter(0);
filter.tb = RT_TABLE_MAIN;
if ((action == IPROUTE_FLUSH) && argc <= 0) {
fprintf(stderr, "\"ip route flush\" requires arguments.\n");
return -1;
}
while (argc > 0) {
if (matches(*argv, "table") == 0) {
__u32 tid;
NEXT_ARG();
if (rtnl_rttable_a2n(&tid, *argv)) {
if (strcmp(*argv, "all") == 0) {
filter.tb = 0;
} else if (strcmp(*argv, "cache") == 0) {
filter.cloned = 1;
} else if (strcmp(*argv, "help") == 0) {
usage();
} else {
invarg("table id value is invalid\n", *argv);
}
} else
filter.tb = tid;
} else if (matches(*argv, "vrf") == 0) {
__u32 tid;
NEXT_ARG();
tid = ipvrf_get_table(*argv);
if (tid == 0)
invarg("Invalid VRF\n", *argv);
filter.tb = tid;
filter.typemask = ~(1 << RTN_LOCAL | 1<<RTN_BROADCAST);
} else if (matches(*argv, "cached") == 0 ||
matches(*argv, "cloned") == 0) {
filter.cloned = 1;
} else if (strcmp(*argv, "tos") == 0 ||
matches(*argv, "dsfield") == 0) {
__u32 tos;
NEXT_ARG();
if (rtnl_dsfield_a2n(&tos, *argv))
invarg("TOS value is invalid\n", *argv);
filter.tos = tos;
filter.tosmask = -1;
} else if (matches(*argv, "protocol") == 0) {
__u32 prot = 0;
NEXT_ARG();
filter.protocolmask = -1;
if (rtnl_rtprot_a2n(&prot, *argv)) {
if (strcmp(*argv, "all") != 0)
invarg("invalid \"protocol\"\n", *argv);
prot = 0;
filter.protocolmask = 0;
}
filter.protocol = prot;
} else if (matches(*argv, "scope") == 0) {
__u32 scope = 0;
NEXT_ARG();
filter.scopemask = -1;
if (rtnl_rtscope_a2n(&scope, *argv)) {
if (strcmp(*argv, "all") != 0)
invarg("invalid \"scope\"\n", *argv);
scope = RT_SCOPE_NOWHERE;
filter.scopemask = 0;
}
filter.scope = scope;
} else if (matches(*argv, "type") == 0) {
int type;
NEXT_ARG();
if (rtnl_rtntype_a2n(&type, *argv))
invarg("node type value is invalid\n", *argv);
filter.typemask = (1<<type);
} else if (strcmp(*argv, "dev") == 0 ||
strcmp(*argv, "oif") == 0) {
NEXT_ARG();
od = *argv;
} else if (strcmp(*argv, "iif") == 0) {
NEXT_ARG();
id = *argv;
} else if (strcmp(*argv, "mark") == 0) {
NEXT_ARG();
if (get_unsigned(&mark, *argv, 0))
invarg("invalid mark value", *argv);
filter.markmask = -1;
} else if (strcmp(*argv, "via") == 0) {
int family;
NEXT_ARG();
family = read_family(*argv);
if (family == AF_UNSPEC)
family = do_ipv6;
else
NEXT_ARG();
get_prefix(&filter.rvia, *argv, family);
} else if (strcmp(*argv, "src") == 0) {
NEXT_ARG();
get_prefix(&filter.rprefsrc, *argv, do_ipv6);
} else if (matches(*argv, "realms") == 0) {
__u32 realm;
NEXT_ARG();
if (get_rt_realms_or_raw(&realm, *argv))
invarg("invalid realms\n", *argv);
filter.realm = realm;
filter.realmmask = ~0U;
if ((filter.realm&0xFFFF) == 0 &&
(*argv)[strlen(*argv) - 1] == '/')
filter.realmmask &= ~0xFFFF;
if ((filter.realm&0xFFFF0000U) == 0 &&
(strchr(*argv, '/') == NULL ||
(*argv)[0] == '/'))
filter.realmmask &= ~0xFFFF0000U;
} else if (matches(*argv, "from") == 0) {
NEXT_ARG();
if (matches(*argv, "root") == 0) {
NEXT_ARG();
get_prefix(&filter.rsrc, *argv, do_ipv6);
} else if (matches(*argv, "match") == 0) {
NEXT_ARG();
get_prefix(&filter.msrc, *argv, do_ipv6);
} else {
if (matches(*argv, "exact") == 0) {
NEXT_ARG();
}
get_prefix(&filter.msrc, *argv, do_ipv6);
filter.rsrc = filter.msrc;
}
} else {
if (matches(*argv, "to") == 0) {
NEXT_ARG();
}
if (matches(*argv, "root") == 0) {
NEXT_ARG();
get_prefix(&filter.rdst, *argv, do_ipv6);
} else if (matches(*argv, "match") == 0) {
NEXT_ARG();
get_prefix(&filter.mdst, *argv, do_ipv6);
} else {
if (matches(*argv, "exact") == 0) {
NEXT_ARG();
}
get_prefix(&filter.mdst, *argv, do_ipv6);
filter.rdst = filter.mdst;
}
}
argc--; argv++;
}
if (do_ipv6 == AF_UNSPEC && filter.tb)
do_ipv6 = AF_INET;
if (id || od) {
int idx;
if (id) {
if ((idx = ll_name_to_index(id)) == 0) {
fprintf(stderr, "Cannot find device \"%s\"\n", id);
return -1;
}
filter.iif = idx;
filter.iifmask = -1;
}
if (od) {
if ((idx = ll_name_to_index(od)) == 0) {
fprintf(stderr, "Cannot find device \"%s\"\n", od);
return -1;
}
filter.oif = idx;
filter.oifmask = -1;
}
}
filter.mark = mark;
if (action == IPROUTE_FLUSH) {
int round = 0;
char flushb[4096-512];
time_t start = time(0);
if (filter.cloned) {
if (do_ipv6 != AF_INET6) {
iproute_flush_cache();
if (show_stats)
printf("*** IPv4 routing cache is flushed.\n");
}
if (do_ipv6 == AF_INET)
return 0;
}
filter.flushb = flushb;
filter.flushp = 0;
filter.flushe = sizeof(flushb);
for (;;) {
if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
perror("Cannot send dump request");
return -2;
}
filter.flushed = 0;
if (rtnl_dump_filter(&rth, filter_fn, stdout) < 0) {
fprintf(stderr, "Flush terminated\n");
return -2;
}
if (filter.flushed == 0) {
if (show_stats) {
if (round == 0 && (!filter.cloned || do_ipv6 == AF_INET6))
printf("Nothing to flush.\n");
else
printf("*** Flush is complete after %d round%s ***\n", round, round > 1?"s":"");
}
fflush(stdout);
return 0;
}
round++;
if ((ret = flush_update()) < 0)
return ret;
if (time(0) - start > 30) {
printf("\n*** Flush not completed after %ld seconds, %d entries remain ***\n",
(long)(time(0) - start), filter.flushed);
return -1;
}
if (show_stats) {
printf("\n*** Round %d, deleting %d entries ***\n", round, filter.flushed);
fflush(stdout);
}
}
}
if (!filter.cloned) {
if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
perror("Cannot send dump request");
return -2;
}
} else {
if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
perror("Cannot send dump request");
return -2;
}
}
if (rtnl_dump_filter(&rth, filter_fn, stdout) < 0) {
fprintf(stderr, "Dump terminated\n");
return -2;
}
return 0;
}
static int iproute_get(int argc, char **argv)
{
struct {
struct nlmsghdr n;
struct rtmsg r;
char buf[1024];
} req = {
.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)),
.n.nlmsg_flags = NLM_F_REQUEST,
.n.nlmsg_type = RTM_GETROUTE,
.r.rtm_family = preferred_family,
};
char *idev = NULL;
char *odev = NULL;
int connected = 0;
int fib_match = 0;
int from_ok = 0;
unsigned int mark = 0;
iproute_reset_filter(0);
filter.cloned = 2;
while (argc > 0) {
if (strcmp(*argv, "tos") == 0 ||
matches(*argv, "dsfield") == 0) {
__u32 tos;
NEXT_ARG();
if (rtnl_dsfield_a2n(&tos, *argv))
invarg("TOS value is invalid\n", *argv);
req.r.rtm_tos = tos;
} else if (matches(*argv, "from") == 0) {
inet_prefix addr;
NEXT_ARG();
if (matches(*argv, "help") == 0)
usage();
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;
} else if (matches(*argv, "iif") == 0) {
NEXT_ARG();
idev = *argv;
} else if (matches(*argv, "mark") == 0) {
NEXT_ARG();
if (get_unsigned(&mark, *argv, 0))
invarg("invalid mark value", *argv);
} else if (matches(*argv, "oif") == 0 ||
strcmp(*argv, "dev") == 0) {
NEXT_ARG();
odev = *argv;
} else if (matches(*argv, "notify") == 0) {
req.r.rtm_flags |= RTM_F_NOTIFY;
} else if (matches(*argv, "connected") == 0) {
connected = 1;
} else if (matches(*argv, "vrf") == 0) {
NEXT_ARG();
if (!name_is_vrf(*argv))
invarg("Invalid VRF\n", *argv);
odev = *argv;
} else if (matches(*argv, "uid") == 0) {
uid_t uid;
NEXT_ARG();
if (get_unsigned(&uid, *argv, 0))
invarg("invalid UID\n", *argv);
addattr32(&req.n, sizeof(req), RTA_UID, uid);
} else if (matches(*argv, "fibmatch") == 0) {
fib_match = 1;
} else if (strcmp(*argv, "as") == 0) {
inet_prefix addr;
NEXT_ARG();
if (strcmp(*argv, "to") == 0)
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_NEWDST, &addr.data, addr.bytelen);
} else {
inet_prefix addr;
if (strcmp(*argv, "to") == 0) {
NEXT_ARG();
}
if (matches(*argv, "help") == 0)
usage();
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;
}
argc--; argv++;
}
if (req.r.rtm_dst_len == 0) {
fprintf(stderr, "need at least a destination address\n");
return -1;
}
if (idev || odev) {
int idx;
if (idev) {
if ((idx = ll_name_to_index(idev)) == 0) {
fprintf(stderr, "Cannot find device \"%s\"\n", idev);
return -1;
}
addattr32(&req.n, sizeof(req), RTA_IIF, idx);
}
if (odev) {
if ((idx = ll_name_to_index(odev)) == 0) {
fprintf(stderr, "Cannot find device \"%s\"\n", odev);
return -1;
}
addattr32(&req.n, sizeof(req), RTA_OIF, idx);
}
}
if (mark)
addattr32(&req.n, sizeof(req), RTA_MARK, mark);
if (req.r.rtm_family == AF_UNSPEC)
req.r.rtm_family = AF_INET;
req.r.rtm_flags |= RTM_F_LOOKUP_TABLE;
if (fib_match)
req.r.rtm_flags |= RTM_F_FIB_MATCH;
if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 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];
if (print_route(NULL, &req.n, (void *)stdout) < 0) {
fprintf(stderr, "An error :-)\n");
return -1;
}
if (req.n.nlmsg_type != RTM_NEWROUTE) {
fprintf(stderr, "Not a route?\n");
return -1;
}
len -= NLMSG_LENGTH(sizeof(*r));
if (len < 0) {
fprintf(stderr, "Wrong len %d\n", len);
return -1;
}
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]) {
fprintf(stderr, "Failed to connect the route\n");
return -1;
}
if (!odev && tb[RTA_OIF])
tb[RTA_OIF]->rta_type = 0;
if (tb[RTA_GATEWAY])
tb[RTA_GATEWAY]->rta_type = 0;
if (tb[RTA_VIA])
tb[RTA_VIA]->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, &req.n, sizeof(req)) < 0)
return -2;
}
if (print_route(NULL, &req.n, (void *)stdout) < 0) {
fprintf(stderr, "An error :-)\n");
return -1;
}
return 0;
}
static int rtattr_cmp(const struct rtattr *rta1, const struct rtattr *rta2)
{
if (!rta1 || !rta2 || rta1->rta_len != rta2->rta_len)
return 1;
return memcmp(RTA_DATA(rta1), RTA_DATA(rta2), RTA_PAYLOAD(rta1));
}
static int restore_handler(const struct sockaddr_nl *nl,
struct rtnl_ctrl_data *ctrl,
struct nlmsghdr *n, void *arg)
{
struct rtmsg *r = NLMSG_DATA(n);
struct rtattr *tb[RTA_MAX+1];
int len = n->nlmsg_len - NLMSG_LENGTH(sizeof(*r));
int ret, prio = *(int *)arg;
parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
/* Restore routes in correct order:
* 0. ones for local addresses,
* 1. ones for local networks,
* 2. others (remote networks/hosts).
*/
if (!prio && !tb[RTA_GATEWAY] && (!tb[RTA_PREFSRC] ||
!rtattr_cmp(tb[RTA_PREFSRC], tb[RTA_DST])))
goto restore;
else if (prio == 1 && !tb[RTA_GATEWAY] && tb[RTA_PREFSRC] &&
rtattr_cmp(tb[RTA_PREFSRC], tb[RTA_DST]))
goto restore;
else if (prio == 2 && tb[RTA_GATEWAY])
goto restore;
return 0;
restore:
n->nlmsg_flags |= NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK;
ll_init_map(&rth);
ret = rtnl_talk(&rth, n, n, sizeof(*n));
if ((ret < 0) && (errno == EEXIST))
ret = 0;
return ret;
}
static int route_dump_check_magic(void)
{
int ret;
__u32 magic = 0;
if (isatty(STDIN_FILENO)) {
fprintf(stderr, "Can't restore route dump from a terminal\n");
return -1;
}
ret = fread(&magic, sizeof(magic), 1, stdin);
if (magic != route_dump_magic) {
fprintf(stderr, "Magic mismatch (%d elems, %x magic)\n", ret, magic);
return -1;
}
return 0;
}
static int iproute_restore(void)
{
int pos, prio;
if (route_dump_check_magic())
return -1;
pos = ftell(stdin);
if (pos == -1) {
perror("Failed to restore: ftell");
return -1;
}
for (prio = 0; prio < 3; prio++) {
int err;
err = rtnl_from_file(stdin, &restore_handler, &prio);
if (err)
return -2;
if (fseek(stdin, pos, SEEK_SET) == -1) {
perror("Failed to restore: fseek");
return -1;
}
}
return 0;
}
static int show_handler(const struct sockaddr_nl *nl,
struct rtnl_ctrl_data *ctrl,
struct nlmsghdr *n, void *arg)
{
print_route(nl, n, stdout);
return 0;
}
static int iproute_showdump(void)
{
if (route_dump_check_magic())
return -1;
if (rtnl_from_file(stdin, &show_handler, NULL))
return -2;
return 0;
}
void iproute_reset_filter(int ifindex)
{
memset(&filter, 0, sizeof(filter));
filter.mdst.bitlen = -1;
filter.msrc.bitlen = -1;
filter.oif = ifindex;
if (filter.oif > 0)
filter.oifmask = -1;
}
int do_iproute(int argc, char **argv)
{
if (argc < 1)
return iproute_list_flush_or_save(0, NULL, IPROUTE_LIST);
if (matches(*argv, "add") == 0)
return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_EXCL,
argc-1, argv+1);
if (matches(*argv, "change") == 0 || strcmp(*argv, "chg") == 0)
return iproute_modify(RTM_NEWROUTE, NLM_F_REPLACE,
argc-1, argv+1);
if (matches(*argv, "replace") == 0)
return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_REPLACE,
argc-1, argv+1);
if (matches(*argv, "prepend") == 0)
return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE,
argc-1, argv+1);
if (matches(*argv, "append") == 0)
return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_APPEND,
argc-1, argv+1);
if (matches(*argv, "test") == 0)
return iproute_modify(RTM_NEWROUTE, NLM_F_EXCL,
argc-1, argv+1);
if (matches(*argv, "delete") == 0)
return iproute_modify(RTM_DELROUTE, 0,
argc-1, argv+1);
if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
|| matches(*argv, "lst") == 0)
return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_LIST);
if (matches(*argv, "get") == 0)
return iproute_get(argc-1, argv+1);
if (matches(*argv, "flush") == 0)
return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_FLUSH);
if (matches(*argv, "save") == 0)
return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_SAVE);
if (matches(*argv, "restore") == 0)
return iproute_restore();
if (matches(*argv, "showdump") == 0)
return iproute_showdump();
if (matches(*argv, "help") == 0)
usage();
fprintf(stderr, "Command \"%s\" is unknown, try \"ip route help\".\n", *argv);
exit(-1);
}
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