| /* |
| * iptunnel.c "ip tunnel" |
| * |
| * 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 <string.h> |
| #include <unistd.h> |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <arpa/inet.h> |
| #include <sys/ioctl.h> |
| #include <net/if.h> |
| #include <net/if_arp.h> |
| #include <linux/ip.h> |
| #include <linux/if_tunnel.h> |
| |
| #include "rt_names.h" |
| #include "utils.h" |
| #include "ip_common.h" |
| #include "tunnel.h" |
| |
| static void usage(void) __attribute__((noreturn)); |
| |
| static void usage(void) |
| { |
| fprintf(stderr, "Usage: ip tunnel { add | change | del | show | prl | 6rd } [ NAME ]\n"); |
| fprintf(stderr, " [ mode { ipip | gre | sit | isatap | vti } ] [ remote ADDR ] [ local ADDR ]\n"); |
| fprintf(stderr, " [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n"); |
| fprintf(stderr, " [ prl-default ADDR ] [ prl-nodefault ADDR ] [ prl-delete ADDR ]\n"); |
| fprintf(stderr, " [ 6rd-prefix ADDR ] [ 6rd-relay_prefix ADDR ] [ 6rd-reset ]\n"); |
| fprintf(stderr, " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n"); |
| fprintf(stderr, "\n"); |
| fprintf(stderr, "Where: NAME := STRING\n"); |
| fprintf(stderr, " ADDR := { IP_ADDRESS | any }\n"); |
| fprintf(stderr, " TOS := { STRING | 00..ff | inherit | inherit/STRING | inherit/00..ff }\n"); |
| fprintf(stderr, " TTL := { 1..255 | inherit }\n"); |
| fprintf(stderr, " KEY := { DOTTED_QUAD | NUMBER }\n"); |
| exit(-1); |
| } |
| |
| static void set_tunnel_proto(struct ip_tunnel_parm *p, int proto) |
| { |
| if (p->iph.protocol && p->iph.protocol != proto) { |
| fprintf(stderr, |
| "You managed to ask for more than one tunnel mode.\n"); |
| exit(-1); |
| } |
| p->iph.protocol = proto; |
| } |
| |
| static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p) |
| { |
| int count = 0; |
| char medium[IFNAMSIZ]; |
| int isatap = 0; |
| |
| memset(p, 0, sizeof(*p)); |
| memset(&medium, 0, sizeof(medium)); |
| |
| p->iph.version = 4; |
| p->iph.ihl = 5; |
| #ifndef IP_DF |
| #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ |
| #endif |
| p->iph.frag_off = htons(IP_DF); |
| |
| while (argc > 0) { |
| if (strcmp(*argv, "mode") == 0) { |
| NEXT_ARG(); |
| if (strcmp(*argv, "ipip") == 0 || |
| strcmp(*argv, "ip/ip") == 0) { |
| set_tunnel_proto(p, IPPROTO_IPIP); |
| } else if (strcmp(*argv, "gre") == 0 || |
| strcmp(*argv, "gre/ip") == 0) { |
| set_tunnel_proto(p, IPPROTO_GRE); |
| } else if (strcmp(*argv, "sit") == 0 || |
| strcmp(*argv, "ipv6/ip") == 0) { |
| set_tunnel_proto(p, IPPROTO_IPV6); |
| } else if (strcmp(*argv, "isatap") == 0) { |
| set_tunnel_proto(p, IPPROTO_IPV6); |
| isatap++; |
| } else if (strcmp(*argv, "vti") == 0) { |
| set_tunnel_proto(p, IPPROTO_IPIP); |
| p->i_flags |= VTI_ISVTI; |
| } else { |
| fprintf(stderr, |
| "Unknown tunnel mode \"%s\"\n", *argv); |
| exit(-1); |
| } |
| } else if (strcmp(*argv, "key") == 0) { |
| NEXT_ARG(); |
| p->i_flags |= GRE_KEY; |
| p->o_flags |= GRE_KEY; |
| p->i_key = p->o_key = tnl_parse_key("key", *argv); |
| } else if (strcmp(*argv, "ikey") == 0) { |
| NEXT_ARG(); |
| p->i_flags |= GRE_KEY; |
| p->i_key = tnl_parse_key("ikey", *argv); |
| } else if (strcmp(*argv, "okey") == 0) { |
| NEXT_ARG(); |
| p->o_flags |= GRE_KEY; |
| p->o_key = tnl_parse_key("okey", *argv); |
| } else if (strcmp(*argv, "seq") == 0) { |
| p->i_flags |= GRE_SEQ; |
| p->o_flags |= GRE_SEQ; |
| } else if (strcmp(*argv, "iseq") == 0) { |
| p->i_flags |= GRE_SEQ; |
| } else if (strcmp(*argv, "oseq") == 0) { |
| p->o_flags |= GRE_SEQ; |
| } else if (strcmp(*argv, "csum") == 0) { |
| p->i_flags |= GRE_CSUM; |
| p->o_flags |= GRE_CSUM; |
| } else if (strcmp(*argv, "icsum") == 0) { |
| p->i_flags |= GRE_CSUM; |
| } else if (strcmp(*argv, "ocsum") == 0) { |
| p->o_flags |= GRE_CSUM; |
| } else if (strcmp(*argv, "nopmtudisc") == 0) { |
| p->iph.frag_off = 0; |
| } else if (strcmp(*argv, "pmtudisc") == 0) { |
| p->iph.frag_off = htons(IP_DF); |
| } else if (strcmp(*argv, "remote") == 0) { |
| NEXT_ARG(); |
| if (strcmp(*argv, "any")) |
| p->iph.daddr = get_addr32(*argv); |
| else |
| p->iph.daddr = htonl(INADDR_ANY); |
| } else if (strcmp(*argv, "local") == 0) { |
| NEXT_ARG(); |
| if (strcmp(*argv, "any")) |
| p->iph.saddr = get_addr32(*argv); |
| else |
| p->iph.saddr = htonl(INADDR_ANY); |
| } else if (strcmp(*argv, "dev") == 0) { |
| NEXT_ARG(); |
| strncpy(medium, *argv, IFNAMSIZ - 1); |
| } else if (strcmp(*argv, "ttl") == 0 || |
| strcmp(*argv, "hoplimit") == 0 || |
| strcmp(*argv, "hlim") == 0) { |
| __u8 uval; |
| |
| NEXT_ARG(); |
| if (strcmp(*argv, "inherit") != 0) { |
| if (get_u8(&uval, *argv, 0)) |
| invarg("invalid TTL\n", *argv); |
| p->iph.ttl = uval; |
| } |
| } else if (strcmp(*argv, "tos") == 0 || |
| strcmp(*argv, "tclass") == 0 || |
| matches(*argv, "dsfield") == 0) { |
| char *dsfield; |
| __u32 uval; |
| |
| NEXT_ARG(); |
| dsfield = *argv; |
| strsep(&dsfield, "/"); |
| if (strcmp(*argv, "inherit") != 0) { |
| dsfield = *argv; |
| p->iph.tos = 0; |
| } else |
| p->iph.tos = 1; |
| if (dsfield) { |
| if (rtnl_dsfield_a2n(&uval, dsfield)) |
| invarg("bad TOS value", *argv); |
| p->iph.tos |= uval; |
| } |
| } else { |
| if (strcmp(*argv, "name") == 0) |
| NEXT_ARG(); |
| else if (matches(*argv, "help") == 0) |
| usage(); |
| |
| if (p->name[0]) |
| duparg2("name", *argv); |
| strncpy(p->name, *argv, IFNAMSIZ - 1); |
| if (cmd == SIOCCHGTUNNEL && count == 0) { |
| struct ip_tunnel_parm old_p; |
| |
| memset(&old_p, 0, sizeof(old_p)); |
| if (tnl_get_ioctl(*argv, &old_p)) |
| return -1; |
| *p = old_p; |
| } |
| } |
| count++; |
| argc--; argv++; |
| } |
| |
| |
| if (p->iph.protocol == 0) { |
| if (memcmp(p->name, "gre", 3) == 0) |
| p->iph.protocol = IPPROTO_GRE; |
| else if (memcmp(p->name, "ipip", 4) == 0) |
| p->iph.protocol = IPPROTO_IPIP; |
| else if (memcmp(p->name, "sit", 3) == 0) |
| p->iph.protocol = IPPROTO_IPV6; |
| else if (memcmp(p->name, "isatap", 6) == 0) { |
| p->iph.protocol = IPPROTO_IPV6; |
| isatap++; |
| } else if (memcmp(p->name, "vti", 3) == 0) { |
| p->iph.protocol = IPPROTO_IPIP; |
| p->i_flags |= VTI_ISVTI; |
| } |
| } |
| |
| if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) { |
| if (!(p->i_flags & VTI_ISVTI) && |
| (p->iph.protocol != IPPROTO_GRE)) { |
| fprintf(stderr, "Keys are not allowed with ipip and sit tunnels\n"); |
| return -1; |
| } |
| } |
| |
| if (medium[0]) { |
| p->link = ll_name_to_index(medium); |
| if (p->link == 0) { |
| fprintf(stderr, "Cannot find device \"%s\"\n", medium); |
| return -1; |
| } |
| } |
| |
| if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) { |
| p->i_key = p->iph.daddr; |
| p->i_flags |= GRE_KEY; |
| } |
| if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) { |
| p->o_key = p->iph.daddr; |
| p->o_flags |= GRE_KEY; |
| } |
| if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) { |
| fprintf(stderr, "A broadcast tunnel requires a source address\n"); |
| return -1; |
| } |
| if (isatap) |
| p->i_flags |= SIT_ISATAP; |
| |
| return 0; |
| } |
| |
| static const char *tnl_defname(const struct ip_tunnel_parm *p) |
| { |
| switch (p->iph.protocol) { |
| case IPPROTO_IPIP: |
| if (p->i_flags & VTI_ISVTI) |
| return "ip_vti0"; |
| else |
| return "tunl0"; |
| case IPPROTO_GRE: |
| return "gre0"; |
| case IPPROTO_IPV6: |
| return "sit0"; |
| } |
| return NULL; |
| } |
| |
| static int do_add(int cmd, int argc, char **argv) |
| { |
| struct ip_tunnel_parm p; |
| const char *basedev; |
| |
| if (parse_args(argc, argv, cmd, &p) < 0) |
| return -1; |
| |
| if (p.iph.ttl && p.iph.frag_off == 0) { |
| fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n"); |
| return -1; |
| } |
| |
| basedev = tnl_defname(&p); |
| if (!basedev) { |
| fprintf(stderr, |
| "cannot determine tunnel mode (ipip, gre, vti or sit)\n"); |
| return -1; |
| } |
| |
| return tnl_add_ioctl(cmd, basedev, p.name, &p); |
| } |
| |
| static int do_del(int argc, char **argv) |
| { |
| struct ip_tunnel_parm p; |
| |
| if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0) |
| return -1; |
| |
| return tnl_del_ioctl(tnl_defname(&p) ? : p.name, p.name, &p); |
| } |
| |
| static void print_tunnel(struct ip_tunnel_parm *p) |
| { |
| struct ip_tunnel_6rd ip6rd; |
| char s1[1024]; |
| char s2[1024]; |
| |
| memset(&ip6rd, 0, sizeof(ip6rd)); |
| |
| /* Do not use format_host() for local addr, |
| * symbolic name will not be useful. |
| */ |
| printf("%s: %s/ip remote %s local %s", |
| p->name, |
| tnl_strproto(p->iph.protocol), |
| p->iph.daddr ? format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1)) : "any", |
| p->iph.saddr ? rt_addr_n2a(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2)) : "any"); |
| |
| if (p->iph.protocol == IPPROTO_IPV6 && (p->i_flags & SIT_ISATAP)) { |
| struct ip_tunnel_prl prl[16]; |
| int i; |
| |
| memset(prl, 0, sizeof(prl)); |
| prl[0].datalen = sizeof(prl) - sizeof(prl[0]); |
| prl[0].addr = htonl(INADDR_ANY); |
| |
| if (!tnl_prl_ioctl(SIOCGETPRL, p->name, prl)) |
| for (i = 1; i < ARRAY_SIZE(prl); i++) { |
| if (prl[i].addr != htonl(INADDR_ANY)) { |
| printf(" %s %s ", |
| (prl[i].flags & PRL_DEFAULT) ? "pdr" : "pr", |
| format_host(AF_INET, 4, &prl[i].addr, s1, sizeof(s1))); |
| } |
| } |
| } |
| |
| if (p->link) { |
| const char *n = ll_index_to_name(p->link); |
| |
| if (n) |
| printf(" dev %s", n); |
| } |
| |
| if (p->iph.ttl) |
| printf(" ttl %d", p->iph.ttl); |
| else |
| printf(" ttl inherit"); |
| |
| if (p->iph.tos) { |
| SPRINT_BUF(b1); |
| printf(" tos"); |
| if (p->iph.tos & 1) |
| printf(" inherit"); |
| if (p->iph.tos & ~1) |
| printf("%c%s ", p->iph.tos & 1 ? '/' : ' ', |
| rtnl_dsfield_n2a(p->iph.tos & ~1, b1, sizeof(b1))); |
| } |
| |
| if (!(p->iph.frag_off & htons(IP_DF))) |
| printf(" nopmtudisc"); |
| |
| if (p->iph.protocol == IPPROTO_IPV6 && !tnl_ioctl_get_6rd(p->name, &ip6rd) && ip6rd.prefixlen) { |
| printf(" 6rd-prefix %s/%u", |
| inet_ntop(AF_INET6, &ip6rd.prefix, s1, sizeof(s1)), |
| ip6rd.prefixlen); |
| if (ip6rd.relay_prefix) { |
| printf(" 6rd-relay_prefix %s/%u", |
| format_host(AF_INET, 4, &ip6rd.relay_prefix, s1, sizeof(s1)), |
| ip6rd.relay_prefixlen); |
| } |
| } |
| |
| if ((p->i_flags & GRE_KEY) && (p->o_flags & GRE_KEY) && p->o_key == p->i_key) |
| printf(" key %u", ntohl(p->i_key)); |
| else if ((p->i_flags | p->o_flags) & GRE_KEY) { |
| if (p->i_flags & GRE_KEY) |
| printf(" ikey %u", ntohl(p->i_key)); |
| if (p->o_flags & GRE_KEY) |
| printf(" okey %u", ntohl(p->o_key)); |
| } |
| |
| if (p->i_flags & GRE_SEQ) |
| printf("%s Drop packets out of sequence.", _SL_); |
| if (p->i_flags & GRE_CSUM) |
| printf("%s Checksum in received packet is required.", _SL_); |
| if (p->o_flags & GRE_SEQ) |
| printf("%s Sequence packets on output.", _SL_); |
| if (p->o_flags & GRE_CSUM) |
| printf("%s Checksum output packets.", _SL_); |
| } |
| |
| static int do_tunnels_list(struct ip_tunnel_parm *p) |
| { |
| char buf[512]; |
| int err = -1; |
| FILE *fp = fopen("/proc/net/dev", "r"); |
| |
| if (fp == NULL) { |
| perror("fopen"); |
| return -1; |
| } |
| |
| /* skip header lines */ |
| if (!fgets(buf, sizeof(buf), fp) || |
| !fgets(buf, sizeof(buf), fp)) { |
| fprintf(stderr, "/proc/net/dev read error\n"); |
| goto end; |
| } |
| |
| while (fgets(buf, sizeof(buf), fp) != NULL) { |
| char name[IFNAMSIZ]; |
| int index, type; |
| struct ip_tunnel_parm p1; |
| char *ptr; |
| |
| buf[sizeof(buf) - 1] = 0; |
| ptr = strchr(buf, ':'); |
| if (ptr == NULL || |
| (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) { |
| fprintf(stderr, "Wrong format for /proc/net/dev. Giving up.\n"); |
| goto end; |
| } |
| if (p->name[0] && strcmp(p->name, name)) |
| continue; |
| index = ll_name_to_index(name); |
| if (index == 0) |
| continue; |
| type = ll_index_to_type(index); |
| if (type == -1) { |
| fprintf(stderr, "Failed to get type of \"%s\"\n", name); |
| continue; |
| } |
| if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT) |
| continue; |
| memset(&p1, 0, sizeof(p1)); |
| if (tnl_get_ioctl(name, &p1)) |
| continue; |
| if ((p->link && p1.link != p->link) || |
| (p->name[0] && strcmp(p1.name, p->name)) || |
| (p->iph.daddr && p1.iph.daddr != p->iph.daddr) || |
| (p->iph.saddr && p1.iph.saddr != p->iph.saddr) || |
| (p->i_key && p1.i_key != p->i_key)) |
| continue; |
| print_tunnel(&p1); |
| if (show_stats) |
| tnl_print_stats(ptr); |
| printf("\n"); |
| } |
| err = 0; |
| end: |
| fclose(fp); |
| return err; |
| } |
| |
| static int do_show(int argc, char **argv) |
| { |
| struct ip_tunnel_parm p; |
| const char *basedev; |
| |
| ll_init_map(&rth); |
| if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0) |
| return -1; |
| |
| basedev = tnl_defname(&p); |
| if (!basedev) |
| return do_tunnels_list(&p); |
| |
| if (tnl_get_ioctl(p.name[0] ? p.name : basedev, &p)) |
| return -1; |
| |
| print_tunnel(&p); |
| printf("\n"); |
| return 0; |
| } |
| |
| static int do_prl(int argc, char **argv) |
| { |
| struct ip_tunnel_prl p; |
| int count = 0; |
| int devname = 0; |
| int cmd = 0; |
| char medium[IFNAMSIZ]; |
| |
| memset(&p, 0, sizeof(p)); |
| memset(&medium, 0, sizeof(medium)); |
| |
| while (argc > 0) { |
| if (strcmp(*argv, "prl-default") == 0) { |
| NEXT_ARG(); |
| cmd = SIOCADDPRL; |
| p.addr = get_addr32(*argv); |
| p.flags |= PRL_DEFAULT; |
| count++; |
| } else if (strcmp(*argv, "prl-nodefault") == 0) { |
| NEXT_ARG(); |
| cmd = SIOCADDPRL; |
| p.addr = get_addr32(*argv); |
| count++; |
| } else if (strcmp(*argv, "prl-delete") == 0) { |
| NEXT_ARG(); |
| cmd = SIOCDELPRL; |
| p.addr = get_addr32(*argv); |
| count++; |
| } else if (strcmp(*argv, "dev") == 0) { |
| NEXT_ARG(); |
| strncpy(medium, *argv, IFNAMSIZ-1); |
| devname++; |
| } else { |
| fprintf(stderr, |
| "Invalid PRL parameter \"%s\"\n", *argv); |
| exit(-1); |
| } |
| if (count > 1) { |
| fprintf(stderr, |
| "One PRL entry at a time\n"); |
| exit(-1); |
| } |
| argc--; argv++; |
| } |
| if (devname == 0) { |
| fprintf(stderr, "Must specify device\n"); |
| exit(-1); |
| } |
| |
| return tnl_prl_ioctl(cmd, medium, &p); |
| } |
| |
| static int do_6rd(int argc, char **argv) |
| { |
| struct ip_tunnel_6rd ip6rd; |
| int devname = 0; |
| int cmd = 0; |
| char medium[IFNAMSIZ]; |
| inet_prefix prefix; |
| |
| memset(&ip6rd, 0, sizeof(ip6rd)); |
| memset(&medium, 0, sizeof(medium)); |
| |
| while (argc > 0) { |
| if (strcmp(*argv, "6rd-prefix") == 0) { |
| NEXT_ARG(); |
| if (get_prefix(&prefix, *argv, AF_INET6)) |
| invarg("invalid 6rd_prefix\n", *argv); |
| cmd = SIOCADD6RD; |
| memcpy(&ip6rd.prefix, prefix.data, 16); |
| ip6rd.prefixlen = prefix.bitlen; |
| } else if (strcmp(*argv, "6rd-relay_prefix") == 0) { |
| NEXT_ARG(); |
| if (get_prefix(&prefix, *argv, AF_INET)) |
| invarg("invalid 6rd-relay_prefix\n", *argv); |
| cmd = SIOCADD6RD; |
| memcpy(&ip6rd.relay_prefix, prefix.data, 4); |
| ip6rd.relay_prefixlen = prefix.bitlen; |
| } else if (strcmp(*argv, "6rd-reset") == 0) { |
| cmd = SIOCDEL6RD; |
| } else if (strcmp(*argv, "dev") == 0) { |
| NEXT_ARG(); |
| strncpy(medium, *argv, IFNAMSIZ-1); |
| devname++; |
| } else { |
| fprintf(stderr, |
| "Invalid 6RD parameter \"%s\"\n", *argv); |
| exit(-1); |
| } |
| argc--; argv++; |
| } |
| if (devname == 0) { |
| fprintf(stderr, "Must specify device\n"); |
| exit(-1); |
| } |
| |
| return tnl_6rd_ioctl(cmd, medium, &ip6rd); |
| } |
| |
| static int tunnel_mode_is_ipv6(char *tunnel_mode) |
| { |
| static const char * const ipv6_modes[] = { |
| "ipv6/ipv6", "ip6ip6", |
| "vti6", |
| "ip/ipv6", "ipv4/ipv6", "ipip6", "ip4ip6", |
| "ip6gre", "gre/ipv6", |
| "any/ipv6", "any" |
| }; |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(ipv6_modes); i++) { |
| if (strcmp(ipv6_modes[i], tunnel_mode) == 0) |
| return 1; |
| } |
| return 0; |
| } |
| |
| int do_iptunnel(int argc, char **argv) |
| { |
| int i; |
| |
| for (i = 0; i < argc - 1; i++) { |
| if (strcmp(argv[i], "mode") == 0) { |
| if (tunnel_mode_is_ipv6(argv[i + 1])) |
| preferred_family = AF_INET6; |
| break; |
| } |
| } |
| switch (preferred_family) { |
| case AF_UNSPEC: |
| preferred_family = AF_INET; |
| break; |
| case AF_INET: |
| break; |
| /* |
| * This is silly enough but we have no easy way to make it |
| * protocol-independent because of unarranged structure between |
| * IPv4 and IPv6. |
| */ |
| case AF_INET6: |
| return do_ip6tunnel(argc, argv); |
| default: |
| fprintf(stderr, "Unsupported protocol family: %d\n", preferred_family); |
| exit(-1); |
| } |
| |
| if (argc > 0) { |
| if (matches(*argv, "add") == 0) |
| return do_add(SIOCADDTUNNEL, argc - 1, argv + 1); |
| if (matches(*argv, "change") == 0) |
| return do_add(SIOCCHGTUNNEL, argc - 1, argv + 1); |
| if (matches(*argv, "delete") == 0) |
| return do_del(argc - 1, argv + 1); |
| if (matches(*argv, "show") == 0 || |
| matches(*argv, "lst") == 0 || |
| matches(*argv, "list") == 0) |
| return do_show(argc - 1, argv + 1); |
| if (matches(*argv, "prl") == 0) |
| return do_prl(argc - 1, argv + 1); |
| if (matches(*argv, "6rd") == 0) |
| return do_6rd(argc - 1, argv + 1); |
| if (matches(*argv, "help") == 0) |
| usage(); |
| } else |
| return do_show(0, NULL); |
| |
| fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\"\n", *argv); |
| exit(-1); |
| } |