/*
* iprule.c "ip rule".
*
* 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 <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <string.h>
#include <linux/if.h>
#include <linux/fib_rules.h>
#include <errno.h>
#include "rt_names.h"
#include "utils.h"
#include "ip_common.h"
#include "json_print.h"
enum list_action {
IPRULE_LIST,
IPRULE_FLUSH,
IPRULE_SAVE,
};
extern struct rtnl_handle rth;
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
fprintf(stderr,
"Usage: ip rule { add | del } SELECTOR ACTION\n"
" ip rule { flush | save | restore }\n"
" ip rule [ list [ SELECTOR ]]\n"
"SELECTOR := [ not ] [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK[/MASK] ]\n"
" [ iif STRING ] [ oif STRING ] [ pref NUMBER ] [ l3mdev ]\n"
" [ uidrange NUMBER-NUMBER ]\n"
" [ ipproto PROTOCOL ]\n"
" [ sport [ NUMBER | NUMBER-NUMBER ]\n"
" [ dport [ NUMBER | NUMBER-NUMBER ] ]\n"
"ACTION := [ table TABLE_ID ]\n"
" [ protocol PROTO ]\n"
" [ nat ADDRESS ]\n"
" [ realms [SRCREALM/]DSTREALM ]\n"
" [ goto NUMBER ]\n"
" SUPPRESSOR\n"
"SUPPRESSOR := [ suppress_prefixlength NUMBER ]\n"
" [ suppress_ifgroup DEVGROUP ]\n"
"TABLE_ID := [ local | main | default | NUMBER ]\n");
exit(-1);
}
static struct
{
int not;
int l3mdev;
int iifmask, oifmask, uidrange;
unsigned int tb;
unsigned int tos, tosmask;
unsigned int pref, prefmask;
unsigned int fwmark, fwmask;
uint64_t tun_id;
char iif[IFNAMSIZ];
char oif[IFNAMSIZ];
struct fib_rule_uid_range range;
inet_prefix src;
inet_prefix dst;
int protocol;
int protocolmask;
struct fib_rule_port_range sport;
struct fib_rule_port_range dport;
__u8 ipproto;
} filter;
static inline int frh_get_table(struct fib_rule_hdr *frh, struct rtattr **tb)
{
__u32 table = frh->table;
if (tb[RTA_TABLE])
table = rta_getattr_u32(tb[RTA_TABLE]);
return table;
}
static bool filter_nlmsg(struct nlmsghdr *n, struct rtattr **tb, int host_len)
{
struct fib_rule_hdr *frh = NLMSG_DATA(n);
__u32 table;
if (preferred_family != AF_UNSPEC && frh->family != preferred_family)
return false;
if (filter.prefmask &&
filter.pref ^ (tb[FRA_PRIORITY] ? rta_getattr_u32(tb[FRA_PRIORITY]) : 0))
return false;
if (filter.not && !(frh->flags & FIB_RULE_INVERT))
return false;
if (filter.src.family) {
inet_prefix *f_src = &filter.src;
if (f_src->family != frh->family ||
f_src->bitlen > frh->src_len)
return false;
if (inet_addr_match_rta(f_src, tb[FRA_SRC]))
return false;
}
if (filter.dst.family) {
inet_prefix *f_dst = &filter.dst;
if (f_dst->family != frh->family ||
f_dst->bitlen > frh->dst_len)
return false;
if (inet_addr_match_rta(f_dst, tb[FRA_DST]))
return false;
}
if (filter.tosmask && filter.tos ^ frh->tos)
return false;
if (filter.fwmark) {
__u32 mark = 0;
if (tb[FRA_FWMARK])
mark = rta_getattr_u32(tb[FRA_FWMARK]);
if (filter.fwmark ^ mark)
return false;
}
if (filter.fwmask) {
__u32 mask = 0;
if (tb[FRA_FWMASK])
mask = rta_getattr_u32(tb[FRA_FWMASK]);
if (filter.fwmask ^ mask)
return false;
}
if (filter.iifmask) {
if (tb[FRA_IFNAME]) {
if (strcmp(filter.iif, rta_getattr_str(tb[FRA_IFNAME])) != 0)
return false;
} else {
return false;
}
}
if (filter.oifmask) {
if (tb[FRA_OIFNAME]) {
if (strcmp(filter.oif, rta_getattr_str(tb[FRA_OIFNAME])) != 0)
return false;
} else {
return false;
}
}
if (filter.l3mdev && !(tb[FRA_L3MDEV] && rta_getattr_u8(tb[FRA_L3MDEV])))
return false;
if (filter.uidrange) {
struct fib_rule_uid_range *r = RTA_DATA(tb[FRA_UID_RANGE]);
if (!tb[FRA_UID_RANGE] ||
r->start != filter.range.start ||
r->end != filter.range.end)
return false;
}
if (filter.ipproto) {
__u8 ipproto = 0;
if (tb[FRA_IP_PROTO])
ipproto = rta_getattr_u8(tb[FRA_IP_PROTO]);
if (filter.ipproto != ipproto)
return false;
}
if (filter.sport.start) {
const struct fib_rule_port_range *r;
if (!tb[FRA_SPORT_RANGE])
return false;
r = RTA_DATA(tb[FRA_SPORT_RANGE]);
if (r->start != filter.sport.start ||
r->end != filter.sport.end)
return false;
}
if (filter.dport.start) {
const struct fib_rule_port_range *r;
if (!tb[FRA_DPORT_RANGE])
return false;
r = RTA_DATA(tb[FRA_DPORT_RANGE]);
if (r->start != filter.dport.start ||
r->end != filter.dport.end)
return false;
}
if (filter.tun_id) {
__u64 tun_id = 0;
if (tb[FRA_TUN_ID]) {
tun_id = ntohll(rta_getattr_u64(tb[FRA_TUN_ID]));
if (filter.tun_id != tun_id)
return false;
} else {
return false;
}
}
table = frh_get_table(frh, tb);
if (filter.tb > 0 && filter.tb ^ table)
return false;
return true;
}
int print_rule(struct nlmsghdr *n, void *arg)
{
FILE *fp = arg;
struct fib_rule_hdr *frh = NLMSG_DATA(n);
int len = n->nlmsg_len;
int host_len = -1;
__u32 table, prio = 0;
struct rtattr *tb[FRA_MAX+1];
SPRINT_BUF(b1);
if (n->nlmsg_type != RTM_NEWRULE && n->nlmsg_type != RTM_DELRULE)
return 0;
len -= NLMSG_LENGTH(sizeof(*frh));
if (len < 0)
return -1;
parse_rtattr(tb, FRA_MAX, RTM_RTA(frh), len);
host_len = af_bit_len(frh->family);
if (!filter_nlmsg(n, tb, host_len))
return 0;
open_json_object(NULL);
if (n->nlmsg_type == RTM_DELRULE)
print_bool(PRINT_ANY, "deleted", "Deleted ", true);
if (tb[FRA_PRIORITY])
prio = rta_getattr_u32(tb[FRA_PRIORITY]);
print_uint(PRINT_ANY, "priority", "%u:\t", prio);
if (frh->flags & FIB_RULE_INVERT)
print_null(PRINT_ANY, "not", "not ", NULL);
if (tb[FRA_SRC]) {
const char *src = rt_addr_n2a_rta(frh->family, tb[FRA_SRC]);
print_string(PRINT_FP, NULL, "from ", NULL);
print_color_string(PRINT_ANY, ifa_family_color(frh->family),
"src", "%s", src);
if (frh->src_len != host_len)
print_uint(PRINT_ANY, "srclen", "/%u", frh->src_len);
} else if (frh->src_len) {
print_string(PRINT_ANY, "src", "from %s", "0");
print_uint(PRINT_ANY, "srclen", "/%u", frh->src_len);
} else {
print_string(PRINT_ANY, "src", "from %s", "all");
}
if (tb[FRA_DST]) {
const char *dst = rt_addr_n2a_rta(frh->family, tb[FRA_DST]);
print_string(PRINT_FP, NULL, " to ", NULL);
print_color_string(PRINT_ANY, ifa_family_color(frh->family),
"dst", "%s", dst);
if (frh->dst_len != host_len)
print_uint(PRINT_ANY, "dstlen", "/%u", frh->dst_len);
} else if (frh->dst_len) {
print_string(PRINT_ANY, "dst", " to %s", "0");
print_uint(PRINT_ANY, "dstlen", "/%u", frh->dst_len);
}
if (frh->tos) {
print_string(PRINT_ANY, "tos",
" tos %s",
rtnl_dsfield_n2a(frh->tos, b1, sizeof(b1)));
}
if (tb[FRA_FWMARK] || tb[FRA_FWMASK]) {
__u32 mark = 0, mask = 0;
if (tb[FRA_FWMARK])
mark = rta_getattr_u32(tb[FRA_FWMARK]);
if (tb[FRA_FWMASK] &&
(mask = rta_getattr_u32(tb[FRA_FWMASK])) != 0xFFFFFFFF) {
print_0xhex(PRINT_ANY, "fwmark", " fwmark %#llx", mark);
print_0xhex(PRINT_ANY, "fwmask", "/%#llx", mask);
} else {
print_0xhex(PRINT_ANY, "fwmark", " fwmark %#llx", mark);
}
}
if (tb[FRA_IFNAME]) {
if (!is_json_context())
fprintf(fp, " iif ");
print_color_string(PRINT_ANY, COLOR_IFNAME,
"iif", "%s",
rta_getattr_str(tb[FRA_IFNAME]));
if (frh->flags & FIB_RULE_IIF_DETACHED)
print_null(PRINT_ANY, "iif_detached", " [detached]",
NULL);
}
if (tb[FRA_OIFNAME]) {
if (!is_json_context())
fprintf(fp, " oif ");
print_color_string(PRINT_ANY, COLOR_IFNAME, "oif", "%s",
rta_getattr_str(tb[FRA_OIFNAME]));
if (frh->flags & FIB_RULE_OIF_DETACHED)
print_null(PRINT_ANY, "oif_detached", " [detached]",
NULL);
}
if (tb[FRA_L3MDEV]) {
__u8 mdev = rta_getattr_u8(tb[FRA_L3MDEV]);
if (mdev)
print_null(PRINT_ANY, "l3mdev",
" lookup [l3mdev-table]", NULL);
}
if (tb[FRA_UID_RANGE]) {
struct fib_rule_uid_range *r = RTA_DATA(tb[FRA_UID_RANGE]);
print_uint(PRINT_ANY, "uid_start", " uidrange %u", r->start);
print_uint(PRINT_ANY, "uid_end", "-%u", r->end);
}
if (tb[FRA_IP_PROTO]) {
SPRINT_BUF(pbuf);
print_string(PRINT_ANY, "ipproto", " ipproto %s",
inet_proto_n2a(rta_getattr_u8(tb[FRA_IP_PROTO]),
pbuf, sizeof(pbuf)));
}
if (tb[FRA_SPORT_RANGE]) {
struct fib_rule_port_range *r = RTA_DATA(tb[FRA_SPORT_RANGE]);
if (r->start == r->end) {
print_uint(PRINT_ANY, "sport", " sport %u", r->start);
} else {
print_uint(PRINT_ANY, "sport_start", " sport %u",
r->start);
print_uint(PRINT_ANY, "sport_end", "-%u", r->end);
}
}
if (tb[FRA_DPORT_RANGE]) {
struct fib_rule_port_range *r = RTA_DATA(tb[FRA_DPORT_RANGE]);
if (r->start == r->end) {
print_uint(PRINT_ANY, "dport", " dport %u", r->start);
} else {
print_uint(PRINT_ANY, "dport_start", " dport %u",
r->start);
print_uint(PRINT_ANY, "dport_end", "-%u", r->end);
}
}
if (tb[FRA_TUN_ID]) {
__u64 tun_id = ntohll(rta_getattr_u64(tb[FRA_TUN_ID]));
print_u64(PRINT_ANY, "tun_id", " tun_id %llu", tun_id);
}
table = frh_get_table(frh, tb);
if (table) {
print_string(PRINT_ANY, "table",
" lookup %s",
rtnl_rttable_n2a(table, b1, sizeof(b1)));
if (tb[FRA_SUPPRESS_PREFIXLEN]) {
int pl = rta_getattr_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
if (pl != -1)
print_int(PRINT_ANY, "suppress_prefixlen",
" suppress_prefixlength %d", pl);
}
if (tb[FRA_SUPPRESS_IFGROUP]) {
int group = rta_getattr_u32(tb[FRA_SUPPRESS_IFGROUP]);
if (group != -1) {
const char *grname
= rtnl_group_n2a(group, b1, sizeof(b1));
print_string(PRINT_ANY, "suppress_ifgroup",
" suppress_ifgroup %s", grname);
}
}
}
if (tb[FRA_FLOW]) {
__u32 to = rta_getattr_u32(tb[FRA_FLOW]);
__u32 from = to>>16;
to &= 0xFFFF;
if (from)
print_string(PRINT_ANY,
"flow_from", " realms %s/",
rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
else
print_string(PRINT_FP, NULL, " realms ", NULL);
print_string(PRINT_ANY, "flow_to", "%s",
rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
}
if (frh->action == RTN_NAT) {
if (tb[RTA_GATEWAY]) {
const char *gateway;
gateway = format_host_rta(frh->family, tb[RTA_GATEWAY]);
print_string(PRINT_ANY, "nat_gateway",
" map-to %s", gateway);
} else {
print_null(PRINT_ANY, "masquerade", " masquerade", NULL);
}
} else if (frh->action == FR_ACT_GOTO) {
if (tb[FRA_GOTO])
print_uint(PRINT_ANY, "goto", " goto %u",
rta_getattr_u32(tb[FRA_GOTO]));
else
print_string(PRINT_ANY, "goto", " goto %s", "none");
if (frh->flags & FIB_RULE_UNRESOLVED)
print_null(PRINT_ANY, "unresolved",
" [unresolved]", NULL);
} else if (frh->action == FR_ACT_NOP) {
print_null(PRINT_ANY, "nop", " nop", NULL);
} else if (frh->action != FR_ACT_TO_TBL) {
print_string(PRINT_ANY, "action", " %s",
rtnl_rtntype_n2a(frh->action, b1, sizeof(b1)));
}
if (tb[FRA_PROTOCOL]) {
__u8 protocol = rta_getattr_u8(tb[FRA_PROTOCOL]);
if ((protocol && protocol != RTPROT_KERNEL) || show_details > 0) {
print_string(PRINT_ANY, "protocol", " proto %s",
rtnl_rtprot_n2a(protocol, b1, sizeof(b1)));
}
}
print_string(PRINT_FP, NULL, "\n", "");
close_json_object();
fflush(fp);
return 0;
}
static __u32 rule_dump_magic = 0x71706986;
static int save_rule_prep(void)
{
int ret;
if (isatty(STDOUT_FILENO)) {
fprintf(stderr, "Not sending a binary stream to stdout\n");
return -1;
}
ret = write(STDOUT_FILENO, &rule_dump_magic, sizeof(rule_dump_magic));
if (ret != sizeof(rule_dump_magic)) {
fprintf(stderr, "Can't write magic to dump file\n");
return -1;
}
return 0;
}
static int save_rule(struct nlmsghdr *n, void *arg)
{
int ret;
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 flush_rule(struct nlmsghdr *n, void *arg)
{
struct rtnl_handle rth2;
struct fib_rule_hdr *frh = NLMSG_DATA(n);
int len = n->nlmsg_len;
struct rtattr *tb[FRA_MAX+1];
int host_len = -1;
len -= NLMSG_LENGTH(sizeof(*frh));
if (len < 0)
return -1;
parse_rtattr(tb, FRA_MAX, RTM_RTA(frh), len);
host_len = af_bit_len(frh->family);
if (!filter_nlmsg(n, tb, host_len))
return 0;
if (tb[FRA_PROTOCOL]) {
__u8 protocol = rta_getattr_u8(tb[FRA_PROTOCOL]);
if ((filter.protocol ^ protocol) & filter.protocolmask)
return 0;
}
if (tb[FRA_PRIORITY]) {
n->nlmsg_type = RTM_DELRULE;
n->nlmsg_flags = NLM_F_REQUEST;
if (rtnl_open(&rth2, 0) < 0)
return -1;
if (rtnl_talk(&rth2, n, NULL) < 0)
return -2;
rtnl_close(&rth2);
}
return 0;
}
static int iprule_list_flush_or_save(int argc, char **argv, int action)
{
rtnl_filter_t filter_fn;
int af = preferred_family;
if (af == AF_UNSPEC)
af = AF_INET;
if (action == IPRULE_SAVE && argc > 0) {
fprintf(stderr, "\"ip rule save\" does not take any arguments.\n");
return -1;
}
switch (action) {
case IPRULE_SAVE:
if (save_rule_prep())
return -1;
filter_fn = save_rule;
break;
case IPRULE_FLUSH:
filter_fn = flush_rule;
break;
default:
filter_fn = print_rule;
}
memset(&filter, 0, sizeof(filter));
while (argc > 0) {
if (matches(*argv, "preference") == 0 ||
matches(*argv, "order") == 0 ||
matches(*argv, "priority") == 0) {
__u32 pref;
NEXT_ARG();
if (get_u32(&pref, *argv, 0))
invarg("preference value is invalid\n", *argv);
filter.pref = pref;
filter.prefmask = 1;
} else if (strcmp(*argv, "not") == 0) {
filter.not = 1;
} else if (strcmp(*argv, "tos") == 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 (strcmp(*argv, "fwmark") == 0) {
char *slash;
__u32 fwmark, fwmask;
NEXT_ARG();
slash = strchr(*argv, '/');
if (slash != NULL)
*slash = '\0';
if (get_u32(&fwmark, *argv, 0))
invarg("fwmark value is invalid\n", *argv);
filter.fwmark = fwmark;
if (slash) {
if (get_u32(&fwmask, slash+1, 0))
invarg("fwmask value is invalid\n",
slash+1);
filter.fwmask = fwmask;
}
} else if (strcmp(*argv, "dev") == 0 ||
strcmp(*argv, "iif") == 0) {
NEXT_ARG();
if (get_ifname(filter.iif, *argv))
invarg("\"iif\"/\"dev\" not a valid ifname", *argv);
filter.iifmask = 1;
} else if (strcmp(*argv, "oif") == 0) {
NEXT_ARG();
if (get_ifname(filter.oif, *argv))
invarg("\"oif\" not a valid ifname", *argv);
filter.oifmask = 1;
} else if (strcmp(*argv, "l3mdev") == 0) {
filter.l3mdev = 1;
} else if (strcmp(*argv, "uidrange") == 0) {
NEXT_ARG();
filter.uidrange = 1;
if (sscanf(*argv, "%u-%u",
&filter.range.start,
&filter.range.end) != 2)
invarg("invalid UID range\n", *argv);
} else if (matches(*argv, "tun_id") == 0) {
__u64 tun_id;
NEXT_ARG();
if (get_u64(&tun_id, *argv, 0))
invarg("\"tun_id\" value is invalid\n", *argv);
filter.tun_id = tun_id;
} else if (matches(*argv, "lookup") == 0 ||
matches(*argv, "table") == 0) {
__u32 tid;
NEXT_ARG();
if (rtnl_rttable_a2n(&tid, *argv))
invarg("table id value is invalid\n", *argv);
filter.tb = tid;
} else if (matches(*argv, "from") == 0 ||
matches(*argv, "src") == 0) {
NEXT_ARG();
if (get_prefix(&filter.src, *argv, af))
invarg("from value is invalid\n", *argv);
} else if (matches(*argv, "protocol") == 0) {
__u32 prot;
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 (strcmp(*argv, "ipproto") == 0) {
int ipproto;
NEXT_ARG();
ipproto = inet_proto_a2n(*argv);
if (ipproto < 0)
invarg("Invalid \"ipproto\" value\n", *argv);
filter.ipproto = ipproto;
} else if (strcmp(*argv, "sport") == 0) {
struct fib_rule_port_range r;
int ret;
NEXT_ARG();
ret = sscanf(*argv, "%hu-%hu", &r.start, &r.end);
if (ret == 1)
r.end = r.start;
else if (ret != 2)
invarg("invalid port range\n", *argv);
filter.sport = r;
} else if (strcmp(*argv, "dport") == 0) {
struct fib_rule_port_range r;
int ret;
NEXT_ARG();
ret = sscanf(*argv, "%hu-%hu", &r.start, &r.end);
if (ret == 1)
r.end = r.start;
else if (ret != 2)
invarg("invalid dport range\n", *argv);
filter.dport = r;
} else{
if (matches(*argv, "dst") == 0 ||
matches(*argv, "to") == 0) {
NEXT_ARG();
}
if (get_prefix(&filter.dst, *argv, af))
invarg("to value is invalid\n", *argv);
}
argc--; argv++;
}
if (rtnl_ruledump_req(&rth, af) < 0) {
perror("Cannot send dump request");
return 1;
}
new_json_obj(json);
if (rtnl_dump_filter(&rth, filter_fn, stdout) < 0) {
fprintf(stderr, "Dump terminated\n");
return 1;
}
delete_json_obj();
return 0;
}
static int rule_dump_check_magic(void)
{
int ret;
__u32 magic = 0;
if (isatty(STDIN_FILENO)) {
fprintf(stderr, "Can't restore rule dump from a terminal\n");
return -1;
}
ret = fread(&magic, sizeof(magic), 1, stdin);
if (magic != rule_dump_magic) {
fprintf(stderr, "Magic mismatch (%d elems, %x magic)\n",
ret, magic);
return -1;
}
return 0;
}
static int restore_handler(struct rtnl_ctrl_data *ctrl,
struct nlmsghdr *n, void *arg)
{
int ret;
n->nlmsg_flags |= NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK;
ll_init_map(&rth);
ret = rtnl_talk(&rth, n, NULL);
if ((ret < 0) && (errno == EEXIST))
ret = 0;
return ret;
}
static int iprule_restore(void)
{
if (rule_dump_check_magic())
exit(-1);
exit(rtnl_from_file(stdin, &restore_handler, NULL));
}
static int iprule_modify(int cmd, int argc, char **argv)
{
int l3mdev_rule = 0;
int table_ok = 0;
__u32 tid = 0;
struct {
struct nlmsghdr n;
struct fib_rule_hdr frh;
char buf[1024];
} req = {
.n.nlmsg_type = cmd,
.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
.n.nlmsg_flags = NLM_F_REQUEST,
.frh.family = preferred_family,
.frh.action = FR_ACT_UNSPEC,
};
if (cmd == RTM_NEWRULE) {
if (argc == 0) {
fprintf(stderr,
"\"ip rule add\" requires arguments.\n");
return -1;
}
req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
req.frh.action = FR_ACT_TO_TBL;
}
if (cmd == RTM_DELRULE && argc == 0) {
fprintf(stderr, "\"ip rule del\" requires arguments.\n");
return -1;
}
while (argc > 0) {
if (strcmp(*argv, "not") == 0) {
req.frh.flags |= FIB_RULE_INVERT;
} else if (strcmp(*argv, "from") == 0) {
inet_prefix dst;
NEXT_ARG();
get_prefix(&dst, *argv, req.frh.family);
req.frh.src_len = dst.bitlen;
addattr_l(&req.n, sizeof(req), FRA_SRC,
&dst.data, dst.bytelen);
} else if (strcmp(*argv, "to") == 0) {
inet_prefix dst;
NEXT_ARG();
get_prefix(&dst, *argv, req.frh.family);
req.frh.dst_len = dst.bitlen;
addattr_l(&req.n, sizeof(req), FRA_DST,
&dst.data, dst.bytelen);
} else if (matches(*argv, "preference") == 0 ||
matches(*argv, "order") == 0 ||
matches(*argv, "priority") == 0) {
__u32 pref;
NEXT_ARG();
if (get_u32(&pref, *argv, 0))
invarg("preference value is invalid\n", *argv);
addattr32(&req.n, sizeof(req), FRA_PRIORITY, pref);
} 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.frh.tos = tos;
} else if (strcmp(*argv, "fwmark") == 0) {
char *slash;
__u32 fwmark, fwmask;
NEXT_ARG();
slash = strchr(*argv, '/');
if (slash != NULL)
*slash = '\0';
if (get_u32(&fwmark, *argv, 0))
invarg("fwmark value is invalid\n", *argv);
addattr32(&req.n, sizeof(req), FRA_FWMARK, fwmark);
if (slash) {
if (get_u32(&fwmask, slash+1, 0))
invarg("fwmask value is invalid\n",
slash+1);
addattr32(&req.n, sizeof(req),
FRA_FWMASK, fwmask);
}
} else if (matches(*argv, "realms") == 0) {
__u32 realm;
NEXT_ARG();
if (get_rt_realms_or_raw(&realm, *argv))
invarg("invalid realms\n", *argv);
addattr32(&req.n, sizeof(req), FRA_FLOW, realm);
} else if (matches(*argv, "protocol") == 0) {
__u32 proto;
NEXT_ARG();
if (rtnl_rtprot_a2n(&proto, *argv))
invarg("\"protocol\" value is invalid\n", *argv);
addattr8(&req.n, sizeof(req), FRA_PROTOCOL, proto);
} else if (matches(*argv, "tun_id") == 0) {
__u64 tun_id;
NEXT_ARG();
if (get_be64(&tun_id, *argv, 0))
invarg("\"tun_id\" value is invalid\n", *argv);
addattr64(&req.n, sizeof(req), FRA_TUN_ID, tun_id);
} else if (matches(*argv, "table") == 0 ||
strcmp(*argv, "lookup") == 0) {
NEXT_ARG();
if (rtnl_rttable_a2n(&tid, *argv))
invarg("invalid table ID\n", *argv);
if (tid < 256)
req.frh.table = tid;
else {
req.frh.table = RT_TABLE_UNSPEC;
addattr32(&req.n, sizeof(req), FRA_TABLE, tid);
}
table_ok = 1;
} else if (matches(*argv, "suppress_prefixlength") == 0 ||
strcmp(*argv, "sup_pl") == 0) {
int pl;
NEXT_ARG();
if (get_s32(&pl, *argv, 0) || pl < 0)
invarg("suppress_prefixlength value is invalid\n",
*argv);
addattr32(&req.n, sizeof(req),
FRA_SUPPRESS_PREFIXLEN, pl);
} else if (matches(*argv, "suppress_ifgroup") == 0 ||
strcmp(*argv, "sup_group") == 0) {
NEXT_ARG();
int group;
if (rtnl_group_a2n(&group, *argv))
invarg("Invalid \"suppress_ifgroup\" value\n",
*argv);
addattr32(&req.n, sizeof(req),
FRA_SUPPRESS_IFGROUP, group);
} else if (strcmp(*argv, "dev") == 0 ||
strcmp(*argv, "iif") == 0) {
NEXT_ARG();
if (check_ifname(*argv))
invarg("\"iif\"/\"dev\" not a valid ifname", *argv);
addattr_l(&req.n, sizeof(req), FRA_IFNAME,
*argv, strlen(*argv)+1);
} else if (strcmp(*argv, "oif") == 0) {
NEXT_ARG();
if (check_ifname(*argv))
invarg("\"oif\" not a valid ifname", *argv);
addattr_l(&req.n, sizeof(req), FRA_OIFNAME,
*argv, strlen(*argv)+1);
} else if (strcmp(*argv, "l3mdev") == 0) {
addattr8(&req.n, sizeof(req), FRA_L3MDEV, 1);
table_ok = 1;
l3mdev_rule = 1;
} else if (strcmp(*argv, "uidrange") == 0) {
struct fib_rule_uid_range r;
NEXT_ARG();
if (sscanf(*argv, "%u-%u", &r.start, &r.end) != 2)
invarg("invalid UID range\n", *argv);
addattr_l(&req.n, sizeof(req), FRA_UID_RANGE, &r,
sizeof(r));
} else if (strcmp(*argv, "nat") == 0 ||
matches(*argv, "map-to") == 0) {
NEXT_ARG();
fprintf(stderr, "Warning: route NAT is deprecated\n");
addattr32(&req.n, sizeof(req), RTA_GATEWAY,
get_addr32(*argv));
req.frh.action = RTN_NAT;
} else if (strcmp(*argv, "ipproto") == 0) {
int ipproto;
NEXT_ARG();
ipproto = inet_proto_a2n(*argv);
if (ipproto < 0)
invarg("Invalid \"ipproto\" value\n",
*argv);
addattr8(&req.n, sizeof(req), FRA_IP_PROTO, ipproto);
} else if (strcmp(*argv, "sport") == 0) {
struct fib_rule_port_range r;
int ret = 0;
NEXT_ARG();
ret = sscanf(*argv, "%hu-%hu", &r.start, &r.end);
if (ret == 1)
r.end = r.start;
else if (ret != 2)
invarg("invalid port range\n", *argv);
addattr_l(&req.n, sizeof(req), FRA_SPORT_RANGE, &r,
sizeof(r));
} else if (strcmp(*argv, "dport") == 0) {
struct fib_rule_port_range r;
int ret = 0;
NEXT_ARG();
ret = sscanf(*argv, "%hu-%hu", &r.start, &r.end);
if (ret == 1)
r.end = r.start;
else if (ret != 2)
invarg("invalid dport range\n", *argv);
addattr_l(&req.n, sizeof(req), FRA_DPORT_RANGE, &r,
sizeof(r));
} else {
int type;
if (strcmp(*argv, "type") == 0)
NEXT_ARG();
if (matches(*argv, "help") == 0)
usage();
else if (matches(*argv, "goto") == 0) {
__u32 target;
type = FR_ACT_GOTO;
NEXT_ARG();
if (get_u32(&target, *argv, 0))
invarg("invalid target\n", *argv);
addattr32(&req.n, sizeof(req),
FRA_GOTO, target);
} else if (matches(*argv, "nop") == 0)
type = FR_ACT_NOP;
else if (rtnl_rtntype_a2n(&type, *argv))
invarg("Failed to parse rule type", *argv);
req.frh.action = type;
table_ok = 1;
}
argc--;
argv++;
}
if (l3mdev_rule && tid != 0) {
fprintf(stderr,
"table can not be specified for l3mdev rules\n");
return -EINVAL;
}
if (req.frh.family == AF_UNSPEC)
req.frh.family = AF_INET;
if (!table_ok && cmd == RTM_NEWRULE)
req.frh.table = RT_TABLE_MAIN;
if (rtnl_talk(&rth, &req.n, NULL) < 0)
return -2;
return 0;
}
int do_iprule(int argc, char **argv)
{
if (argc < 1) {
return iprule_list_flush_or_save(0, NULL, IPRULE_LIST);
} else if (matches(argv[0], "list") == 0 ||
matches(argv[0], "lst") == 0 ||
matches(argv[0], "show") == 0) {
return iprule_list_flush_or_save(argc-1, argv+1, IPRULE_LIST);
} else if (matches(argv[0], "save") == 0) {
return iprule_list_flush_or_save(argc-1, argv+1, IPRULE_SAVE);
} else if (matches(argv[0], "restore") == 0) {
return iprule_restore();
} else if (matches(argv[0], "add") == 0) {
return iprule_modify(RTM_NEWRULE, argc-1, argv+1);
} else if (matches(argv[0], "delete") == 0) {
return iprule_modify(RTM_DELRULE, argc-1, argv+1);
} else if (matches(argv[0], "flush") == 0) {
return iprule_list_flush_or_save(argc-1, argv+1, IPRULE_FLUSH);
} else if (matches(argv[0], "help") == 0)
usage();
fprintf(stderr,
"Command \"%s\" is unknown, try \"ip rule help\".\n", *argv);
exit(-1);
}
int do_multirule(int argc, char **argv)
{
switch (preferred_family) {
case AF_UNSPEC:
case AF_INET:
preferred_family = RTNL_FAMILY_IPMR;
break;
case AF_INET6:
preferred_family = RTNL_FAMILY_IP6MR;
break;
case RTNL_FAMILY_IPMR:
case RTNL_FAMILY_IP6MR:
break;
default:
fprintf(stderr,
"Multicast rules are only supported for IPv4/IPv6, was: %i\n",
preferred_family);
exit(-1);
}
return do_iprule(argc, argv);
}