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/*
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* ipfou.c FOU (foo over UDP) support
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Tom Herbert <therbert@google.com>
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*/
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <net/if.h>
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#include <linux/fou.h>
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#include <linux/genetlink.h>
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#include <linux/ip.h>
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#include <arpa/inet.h>
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#include "libgenl.h"
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#include "utils.h"
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#include "ip_common.h"
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#include "json_print.h"
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static void usage(void)
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{
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fprintf(stderr,
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"Usage: ip fou add port PORT { ipproto PROTO | gue }\n"
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" [ local IFADDR ] [ peer IFADDR ]\n"
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" [ peer_port PORT ] [ dev IFNAME ]\n"
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" ip fou del port PORT [ local IFADDR ]\n"
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" [ peer IFADDR ] [ peer_port PORT ]\n"
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" [ dev IFNAME ]\n"
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" ip fou show\n"
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"\n"
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"Where: PROTO { ipproto-name | 1..255 }\n"
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" PORT { 1..65535 }\n"
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" IFADDR { addr }\n");
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exit(-1);
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}
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/* netlink socket */
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static struct rtnl_handle genl_rth = { .fd = -1 };
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static int genl_family = -1;
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#define FOU_REQUEST(_req, _bufsiz, _cmd, _flags) \
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GENL_REQUEST(_req, _bufsiz, genl_family, 0, \
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FOU_GENL_VERSION, _cmd, _flags)
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static int fou_parse_opt(int argc, char **argv, struct nlmsghdr *n,
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bool adding)
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{
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const char *local = NULL, *peer = NULL;
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__u16 port, peer_port = 0;
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__u8 family = preferred_family;
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bool gue_set = false;
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int ipproto_set = 0;
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__u8 ipproto, type;
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int port_set = 0;
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int index = 0;
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if (preferred_family == AF_UNSPEC) {
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family = AF_INET;
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}
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while (argc > 0) {
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if (!matches(*argv, "port")) {
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NEXT_ARG();
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if (get_be16(&port, *argv, 0) || port == 0)
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invarg("invalid port", *argv);
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port_set = 1;
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} else if (!matches(*argv, "ipproto")) {
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struct protoent *servptr;
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NEXT_ARG();
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servptr = getprotobyname(*argv);
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if (servptr)
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ipproto = servptr->p_proto;
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else if (get_u8(&ipproto, *argv, 0) || ipproto == 0)
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invarg("invalid ipproto", *argv);
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ipproto_set = 1;
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} else if (!matches(*argv, "gue")) {
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gue_set = true;
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} else if (!matches(*argv, "-6")) {
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family = AF_INET6;
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} else if (!matches(*argv, "local")) {
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NEXT_ARG();
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local = *argv;
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} else if (!matches(*argv, "peer")) {
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NEXT_ARG();
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peer = *argv;
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} else if (!matches(*argv, "peer_port")) {
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NEXT_ARG();
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if (get_be16(&peer_port, *argv, 0) || peer_port == 0)
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invarg("invalid peer port", *argv);
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} else if (!matches(*argv, "dev")) {
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const char *ifname;
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NEXT_ARG();
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ifname = *argv;
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if (check_ifname(ifname)) {
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fprintf(stderr, "fou: invalid device name\n");
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exit(EXIT_FAILURE);
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}
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index = ll_name_to_index(ifname);
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if (!index) {
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fprintf(stderr, "fou: unknown device name\n");
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exit(EXIT_FAILURE);
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}
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} else {
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fprintf(stderr
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, "fou: unknown command \"%s\"?\n", *argv);
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usage();
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return -1;
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}
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argc--, argv++;
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}
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if (!port_set) {
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fprintf(stderr, "fou: missing port\n");
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return -1;
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}
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if (!ipproto_set && !gue_set && adding) {
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fprintf(stderr, "fou: must set ipproto or gue\n");
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return -1;
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}
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if (ipproto_set && gue_set) {
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fprintf(stderr, "fou: cannot set ipproto and gue\n");
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return -1;
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}
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if ((peer_port && !peer) || (peer && !peer_port)) {
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fprintf(stderr, "fou: both peer and peer port must be set\n");
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return -1;
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}
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type = gue_set ? FOU_ENCAP_GUE : FOU_ENCAP_DIRECT;
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addattr16(n, 1024, FOU_ATTR_PORT, port);
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addattr8(n, 1024, FOU_ATTR_TYPE, type);
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addattr8(n, 1024, FOU_ATTR_AF, family);
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if (ipproto_set)
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addattr8(n, 1024, FOU_ATTR_IPPROTO, ipproto);
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if (local) {
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inet_prefix local_addr;
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__u8 attr_type = family == AF_INET ? FOU_ATTR_LOCAL_V4 :
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FOU_ATTR_LOCAL_V6;
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if (get_addr(&local_addr, local, family)) {
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fprintf(stderr, "fou: parsing local address failed\n");
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exit(EXIT_FAILURE);
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}
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addattr_l(n, 1024, attr_type, &local_addr.data,
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local_addr.bytelen);
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}
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if (peer) {
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inet_prefix peer_addr;
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__u8 attr_type = family == AF_INET ? FOU_ATTR_PEER_V4 :
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FOU_ATTR_PEER_V6;
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if (get_addr(&peer_addr, peer, family)) {
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fprintf(stderr, "fou: parsing peer address failed\n");
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exit(EXIT_FAILURE);
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}
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addattr_l(n, 1024, attr_type, &peer_addr.data,
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peer_addr.bytelen);
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if (peer_port)
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addattr16(n, 1024, FOU_ATTR_PEER_PORT, peer_port);
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}
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if (index)
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addattr32(n, 1024, FOU_ATTR_IFINDEX, index);
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return 0;
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}
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static int do_add(int argc, char **argv)
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{
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FOU_REQUEST(req, 1024, FOU_CMD_ADD, NLM_F_REQUEST);
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fou_parse_opt(argc, argv, &req.n, true);
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if (rtnl_talk(&genl_rth, &req.n, NULL) < 0)
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return -2;
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return 0;
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}
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static int do_del(int argc, char **argv)
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{
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FOU_REQUEST(req, 1024, FOU_CMD_DEL, NLM_F_REQUEST);
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fou_parse_opt(argc, argv, &req.n, false);
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if (rtnl_talk(&genl_rth, &req.n, NULL) < 0)
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return -2;
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return 0;
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}
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static int print_fou_mapping(struct nlmsghdr *n, void *arg)
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{
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__u8 family = AF_INET, local_attr_type, peer_attr_type, byte_len;
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struct rtattr *tb[FOU_ATTR_MAX + 1];
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__u8 empty_buf[16] = {0};
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struct genlmsghdr *ghdr;
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int len = n->nlmsg_len;
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if (n->nlmsg_type != genl_family)
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return 0;
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len -= NLMSG_LENGTH(GENL_HDRLEN);
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if (len < 0)
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return -1;
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ghdr = NLMSG_DATA(n);
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parse_rtattr(tb, FOU_ATTR_MAX, (void *) ghdr + GENL_HDRLEN, len);
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open_json_object(NULL);
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if (tb[FOU_ATTR_PORT])
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print_uint(PRINT_ANY, "port", "port %u",
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ntohs(rta_getattr_u16(tb[FOU_ATTR_PORT])));
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if (tb[FOU_ATTR_TYPE] &&
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rta_getattr_u8(tb[FOU_ATTR_TYPE]) == FOU_ENCAP_GUE)
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print_null(PRINT_ANY, "gue", " gue", NULL);
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else if (tb[FOU_ATTR_IPPROTO])
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print_uint(PRINT_ANY, "ipproto",
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" ipproto %u", rta_getattr_u8(tb[FOU_ATTR_IPPROTO]));
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if (tb[FOU_ATTR_AF]) {
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family = rta_getattr_u8(tb[FOU_ATTR_AF]);
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print_string(PRINT_JSON, "family", NULL,
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family_name(family));
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if (family == AF_INET6)
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print_string(PRINT_FP, NULL,
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" -6", NULL);
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}
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local_attr_type = family == AF_INET ? FOU_ATTR_LOCAL_V4 :
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FOU_ATTR_LOCAL_V6;
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peer_attr_type = family == AF_INET ? FOU_ATTR_PEER_V4 :
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FOU_ATTR_PEER_V6;
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byte_len = af_bit_len(family) / 8;
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3880ab |
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if (tb[local_attr_type] && memcmp(RTA_DATA(tb[local_attr_type]),
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empty_buf, byte_len)) {
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print_string(PRINT_ANY, "local", " local %s",
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format_host_rta(family, tb[local_attr_type]));
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}
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3880ab |
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if (tb[peer_attr_type] && memcmp(RTA_DATA(tb[peer_attr_type]),
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3880ab |
empty_buf, byte_len)) {
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3880ab |
print_string(PRINT_ANY, "peer", " peer %s",
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format_host_rta(family, tb[peer_attr_type]));
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}
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if (tb[FOU_ATTR_PEER_PORT]) {
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__u16 p_port = ntohs(rta_getattr_u16(tb[FOU_ATTR_PEER_PORT]));
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if (p_port)
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print_uint(PRINT_ANY, "peer_port", " peer_port %u",
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p_port);
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3880ab |
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}
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|
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if (tb[FOU_ATTR_IFINDEX]) {
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int index = rta_getattr_s32(tb[FOU_ATTR_IFINDEX]);
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if (index) {
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const char *ifname;
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3880ab |
|
|
Packit Service |
3880ab |
ifname = ll_index_to_name(index);
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (ifname)
|
|
Packit Service |
3880ab |
print_string(PRINT_ANY, "dev", " dev %s",
|
|
Packit Service |
3880ab |
ifname);
|
|
Packit Service |
3880ab |
}
|
|
Packit Service |
3880ab |
}
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
print_string(PRINT_FP, NULL, "\n", NULL);
|
|
Packit Service |
3880ab |
close_json_object();
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
return 0;
|
|
Packit Service |
3880ab |
}
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
static int do_show(int argc, char **argv)
|
|
Packit Service |
3880ab |
{
|
|
Packit Service |
3880ab |
FOU_REQUEST(req, 4096, FOU_CMD_GET, NLM_F_REQUEST | NLM_F_DUMP);
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (argc > 0) {
|
|
Packit Service |
3880ab |
fprintf(stderr,
|
|
Packit Service |
3880ab |
"\"ip fou show\" does not take any arguments.\n");
|
|
Packit Service |
3880ab |
return -1;
|
|
Packit Service |
3880ab |
}
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (rtnl_send(&genl_rth, &req.n, req.n.nlmsg_len) < 0) {
|
|
Packit Service |
3880ab |
perror("Cannot send show request");
|
|
Packit Service |
3880ab |
exit(1);
|
|
Packit Service |
3880ab |
}
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
new_json_obj(json);
|
|
Packit Service |
3880ab |
if (rtnl_dump_filter(&genl_rth, print_fou_mapping, stdout) < 0) {
|
|
Packit Service |
3880ab |
fprintf(stderr, "Dump terminated\n");
|
|
Packit Service |
3880ab |
return 1;
|
|
Packit Service |
3880ab |
}
|
|
Packit Service |
3880ab |
delete_json_obj();
|
|
Packit Service |
3880ab |
fflush(stdout);
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
return 0;
|
|
Packit Service |
3880ab |
}
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
int do_ipfou(int argc, char **argv)
|
|
Packit Service |
3880ab |
{
|
|
Packit Service |
3880ab |
if (argc < 1)
|
|
Packit Service |
3880ab |
usage();
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (matches(*argv, "help") == 0)
|
|
Packit Service |
3880ab |
usage();
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (genl_init_handle(&genl_rth, FOU_GENL_NAME, &genl_family))
|
|
Packit Service |
3880ab |
exit(1);
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (matches(*argv, "add") == 0)
|
|
Packit Service |
3880ab |
return do_add(argc-1, argv+1);
|
|
Packit Service |
3880ab |
if (matches(*argv, "delete") == 0)
|
|
Packit Service |
3880ab |
return do_del(argc-1, argv+1);
|
|
Packit Service |
3880ab |
if (matches(*argv, "show") == 0)
|
|
Packit Service |
3880ab |
return do_show(argc-1, argv+1);
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
fprintf(stderr,
|
|
Packit Service |
3880ab |
"Command \"%s\" is unknown, try \"ip fou help\".\n", *argv);
|
|
Packit Service |
3880ab |
exit(-1);
|
|
Packit Service |
3880ab |
}
|