TUNNEL: IPv6-over-IPv6 tunnel support.
Fix ip6tunnel.c to be fit with current ip command style.
Unlike other modules currently iptunnel (and ip6tunnel) is not
designed as protocol-independent because of unarranged structure
between IPv4 and IPv6.
Usage: ip -f inet6 tunnel { add | change | del | show } [ NAME ]
[ remote ADDR local ADDR ] [ dev PHYS_DEV ]
[ encaplimit ELIM ]
[ hoplimit HLIM ] [ tc TC ] [ fl FL ]
[ dscp inherit ]
Where: NAME := STRING
ADDR := IPV6_ADDRESS
ELIM := { none | 0..255 }(default=4)
HLIM := 0..255 (default=64)
TC := { 0x0..0xff | inherit }
FL := { 0x0..0xfffff | inherit }
Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
diff --git a/ip/ip6tunnel.c b/ip/ip6tunnel.c
index c8578e5..488afcb 100644
--- a/ip/ip6tunnel.c
+++ b/ip/ip6tunnel.c
@@ -28,139 +28,47 @@
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
-#include <errno.h>
-
-#include <sys/ioctl.h>
-#include <sys/socket.h>
-#include <net/if.h>
-#include <netinet/in.h>
-#include <netdb.h>
#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
#include <arpa/inet.h>
-
-#include <asm/types.h>
-#include <linux/sockios.h>
+#include <sys/ioctl.h>
#include <linux/ip.h>
+#include <linux/if.h>
+#include <linux/if_arp.h>
#include <linux/if_tunnel.h>
+#include <linux/ip6_tunnel.h>
-#include "ipv6_tunnel.h"
+#include "utils.h"
+#include "tunnel.h"
+#define IP6_FLOWINFO_TCLASS htonl(0x0FF00000)
+#define IP6_FLOWINFO_FLOWLABEL htonl(0x000FFFFF)
-int tunnel_local_packets = 0;
+#define DEFAULT_TNL_HOP_LIMIT (64)
+
+static void usage(void) __attribute__((noreturn));
static void usage(void)
{
- fprintf(stderr, "Usage: ipv6tunnel { add | change | del | show } [ NAME ]\n");
- fprintf(stderr, " [ --allow-local-packets ]\n");
- fprintf(stderr, " [ --use-original-traffic-class ]\n");
- fprintf(stderr, " [ remote ADDR local ADDR ]\n");
- fprintf(stderr, " [ dev PHYS_DEV ]\n");
- fprintf(stderr, " [ encaplimit TEL ]\n");
- fprintf(stderr, " [ hoplimit HOPLIMIT ]\n");
- fprintf(stderr, " [ flowlabel FL ]\n");
+ fprintf(stderr, "Usage: ip -f inet6 tunnel { add | change | del | show } [ NAME ]\n");
+ fprintf(stderr, " [ remote ADDR local ADDR ] [ dev PHYS_DEV ]\n");
+ fprintf(stderr, " [ encaplimit ELIM ]\n");
+ fprintf(stderr ," [ hoplimit HLIM ] [ tc TC ] [ fl FL ]\n");
+ fprintf(stderr, " [ dscp inherit ]\n");
+ fprintf(stderr, "\n");
fprintf(stderr, "Where: NAME := STRING\n");
fprintf(stderr, " ADDR := IPV6_ADDRESS\n");
- fprintf(stderr, " HOPLIMIT := 0..255\n");
- fprintf(stderr, " TEL := { none | 0..255 }\n");
- fprintf(stderr, " FL := 0x0..0xfffff\n");
- fprintf(stderr, " PHYS_DEV := STRING\n");
+ fprintf(stderr, " ELIM := { none | 0..255 }(default=%d)\n",
+ IPV6_DEFAULT_TNL_ENCAP_LIMIT);
+ fprintf(stderr, " HLIM := 0..255 (default=%d)\n",
+ DEFAULT_TNL_HOP_LIMIT);
+ fprintf(stderr, " TC := { 0x0..0xff | inherit }\n");
+ fprintf(stderr, " FL := { 0x0..0xfffff | inherit }\n");
exit(-1);
}
-static int do_ioctl_get_ifindex(char *dev)
-{
- struct ifreq ifr;
- int fd;
- int err;
-
-// fprintf(stderr, "do_ioctl_get_ifindex\n");
-
- strcpy(ifr.ifr_name, dev);
- fd = socket(AF_INET6, SOCK_DGRAM, 0);
- err = ioctl(fd, SIOCGIFINDEX, &ifr);
- if (err) {
- perror("ioctl");
- return 0;
- }
- close(fd);
- return ifr.ifr_ifindex;
-}
-
-static char *do_ioctl_get_ifname(int idx)
-{
- static struct ifreq ifr;
- int fd;
- int err;
-
-// fprintf(stderr, "do_ioctl_get_ifname\n");
-
- ifr.ifr_ifindex = idx;
- fd = socket(AF_INET6, SOCK_DGRAM, 0);
- err = ioctl(fd, SIOCGIFNAME, &ifr);
- if (err) {
- perror("ioctl");
- return NULL;
- }
- close(fd);
- return ifr.ifr_name;
-}
-
-static int do_get_ioctl(char *basedev, struct ipv6_tnl_parm *p)
-{
- struct ifreq ifr;
- int fd;
- int err;
-
-// fprintf(stderr, "do_get_ioctl\n");
-
- strcpy(ifr.ifr_name, basedev);
- ifr.ifr_ifru.ifru_data = (void *)p;
- fd = socket(AF_INET6, SOCK_DGRAM, 0);
- err = ioctl(fd, SIOCGETTUNNEL, &ifr);
- if (err)
- perror("ioctl");
- close(fd);
- return err;
-}
-
-static int do_add_ioctl(int cmd, char *basedev, struct ipv6_tnl_parm *p)
-{
- struct ifreq ifr;
- int fd;
- int err;
-
-// fprintf(stderr, "do_add_ioctl\n");
-
- strcpy(ifr.ifr_name, basedev);
- ifr.ifr_ifru.ifru_data = (void *)p;
- fd = socket(AF_INET6, SOCK_DGRAM, 0);
- err = ioctl(fd, cmd, &ifr);
- if (err)
- perror("ioctl");
- close(fd);
- return err;
-}
-
-
-static int do_del_ioctl(char *basedev, struct ipv6_tnl_parm *p)
-{
- struct ifreq ifr;
- int fd;
- int err;
-
-// fprintf(stderr, "do_del_ioctl\n");
-
- strcpy(ifr.ifr_name, basedev);
- ifr.ifr_ifru.ifru_data = (void *)p;
- fd = socket(AF_INET6, SOCK_DGRAM, 0);
- err = ioctl(fd, SIOCDELTUNNEL, &ifr);
- if (err)
- perror("ioctl");
- close(fd);
- return err;
-}
-
-void print_tunnel(struct ipv6_tnl_parm *p)
+static void print_tunnel(struct ip6_tnl_parm *p)
{
char remote[64];
char local[64];
@@ -168,235 +76,312 @@
inet_ntop(AF_INET6, &p->raddr, remote, sizeof(remote));
inet_ntop(AF_INET6, &p->laddr, local, sizeof(local));
- printf("%s: %s/IPv6 remote %s local %s",
- p->name,
- (p->proto == IPPROTO_IPV6 ? "IPv6" : "unknown"),
- remote, local);
+ printf("%s: %s/ipv6 remote %s local %s",
+ p->name, tnl_strproto(p->proto), remote, local);
if (p->link) {
- char *n = do_ioctl_get_ifname(p->link);
+ char *n = tnl_ioctl_get_ifname(p->link);
if (n)
printf(" dev %s", n);
}
- if (p->encap_limit)
- printf(" encaplimit %d", p->encap_limit);
- printf(" hoplimit %d", p->hop_limit);
+ if (p->flags & IP6_TNL_F_IGN_ENCAP_LIMIT)
+ printf(" encaplimit none");
+ else
+ printf(" encaplimit %u", p->encap_limit);
- if (p->flow_lbl)
- printf(" flowlabel 0x%x", p->flow_lbl);
+ printf(" hoplimit %u", p->hop_limit);
- if (p->flags) {
- char flags[33];
- char *fp = flags;
- memset(flags, 0, 33);
- if (p->flags & IPV6_TNL_F_IGN_ENCAP_LIMIT) {
- *fp = 'E';
- fp++;
- }
- if (p->flags & IPV6_TNL_F_USE_ORIG_TCLASS) {
- *fp = 'T';
- fp++;
- }
- if (p->flags & IPV6_TNL_F_ALLOW_LOCAL) {
- *fp = 'L';
- fp++;
- }
- if (p->flags & IPV6_TNL_F_KERNEL_DEV) {
- *fp = 'K';
- fp++;
- }
- if (p->flags & IPV6_TNL_F_MIPV6_DEV) {
- *fp = 'M';
- fp++;
- }
- if (p->flags & IPV6_TNL_F_RCV_ONLY) {
- *fp = 'R';
- fp++;
- }
- printf(" flags %s", flags);
+ if (p->flags & IP6_TNL_F_USE_ORIG_TCLASS)
+ printf(" tc inherit");
+ else {
+ __u32 val = ntohl(p->flowinfo & IP6_FLOWINFO_TCLASS);
+ printf(" tc 0x%02x", (__u8)(val >> 20));
}
- printf("\n");
+
+ if (p->flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
+ printf(" fl inherit");
+ else
+ printf(" fl 0x%05x", ntohl(p->flowinfo & IP6_FLOWINFO_FLOWLABEL));
+
+ printf(" (flowinfo 0x%08x)", ntohl(p->flowinfo));
+
+ if (p->flags & IP6_TNL_F_RCV_DSCP_COPY)
+ printf(" dscp inherit");
}
-void resolve_name(char *name, struct in6_addr *ip6)
-{
- struct addrinfo ai, *res;
- int err;
- memset(&ai, 0, sizeof(struct addrinfo));
- ai.ai_family = AF_INET6;
- ai.ai_protocol = IPPROTO_IPV6;
- ai.ai_flags = AI_NUMERICHOST;
- err = getaddrinfo(name, NULL, &ai, &res);
- if (err)
- exit(-1);
-
- *ip6 = ((struct sockaddr_in6 *) (res->ai_addr))->sin6_addr;
- freeaddrinfo(res);
-}
-
-int get_u8(__u8 *val, char *arg)
-{
- unsigned long res = 0;
- char *ptr;
-
- if (!arg || !*arg)
- return -1;
- res = strtoul(arg, &ptr, 0);
- if (!ptr || ptr == arg || *ptr || res > 0xFF)
- return -1;
- *val = (__u8) res;
- return 0;
-}
-
-int get_u20(__u32 *val, char *arg)
-{
- unsigned long res = 0;
- char *ptr;
-
- if (!arg || !*arg)
- return -1;
- res = strtoul(arg, &ptr, 0);
- if (!ptr || ptr == arg || *ptr || res > 0xFFFFF)
- return -1;
- *val = res;
- return 0;
-}
-
-static int parse_args(int argc, char **argv, struct ipv6_tnl_parm *p)
+static int parse_args(int argc, char **argv, struct ip6_tnl_parm *p)
{
char medium[IFNAMSIZ];
-// fprintf(stderr, "parse_args\n");
-
- memset(p, 0, sizeof(*p));
- p->hop_limit = -1;
- p->encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT;
- p->proto = IPPROTO_IPV6;
- memset(&medium, 0, sizeof(medium));
+ memset(medium, 0, sizeof(medium));
while (argc > 0) {
- if (!strcmp(*argv, "--help") || !strcmp(*argv, "-h")) {
- usage();
- } else if (!strcmp(*argv, "--allow-local-packets")) {
- p->flags |= IPV6_TNL_F_ALLOW_LOCAL;
- } else if (!strcmp(*argv, "--use-original-traffic-class")) {
- p->flags |= IPV6_TNL_F_USE_ORIG_TCLASS;
- } else if (!strcmp(*argv, "remote")) {
- argv++;
- if (--argc <= 0)
- usage();
- resolve_name(*argv, &p->raddr);
- } else if (!strcmp(*argv, "local")) {
- argv++;
- if (--argc <= 0)
- usage();
- resolve_name(*argv, &p->laddr);
- } else if (!strcmp(*argv, "dev")) {
- argv++;
- if (--argc <= 0)
- usage();
+ if (strcmp(*argv, "remote") == 0) {
+ inet_prefix raddr;
+ NEXT_ARG();
+ get_prefix(&raddr, *argv, preferred_family);
+ if (raddr.family == AF_UNSPEC)
+ invarg("\"remote\" address family is AF_UNSPEC", *argv);
+ memcpy(&p->raddr, &raddr.data, sizeof(p->raddr));
+ } else if (strcmp(*argv, "local") == 0) {
+ inet_prefix laddr;
+ NEXT_ARG();
+ get_prefix(&laddr, *argv, preferred_family);
+ if (laddr.family == AF_UNSPEC)
+ invarg("\"local\" address family is AF_UNSPEC", *argv);
+ memcpy(&p->laddr, &laddr.data, sizeof(p->laddr));
+ } else if (strcmp(*argv, "dev") == 0) {
+ NEXT_ARG();
strncpy(medium, *argv, IFNAMSIZ - 1);
- } else if (!strcmp(*argv, "hoplimit")) {
- __u8 uval;
- argv++;
- if (--argc <= 0)
- usage();
- if (get_u8(&uval, *argv) < -1)
- usage();
- p->hop_limit = uval;
- } else if (!strcmp(*argv, "flowlabel")) {
- __u32 uval;
- argv++;
- if (--argc <= 0)
- usage();
- if (get_u20(&uval, *argv) < -1)
- usage();
- p->flow_lbl = uval;
- } else if (!strcmp(*argv, "encaplimit")) {
- argv++;
- if (--argc <= 0)
- usage();
- if (!strcmp(*argv, "none")) {
- p->flags |= IPV6_TNL_F_IGN_ENCAP_LIMIT;
+ } else if (strcmp(*argv, "encaplimit") == 0) {
+ NEXT_ARG();
+ if (strcmp(*argv, "none") == 0) {
+ p->flags |= IP6_TNL_F_IGN_ENCAP_LIMIT;
} else {
__u8 uval;
- if (get_u8(&uval, *argv) < -1)
- usage();
+ if (get_u8(&uval, *argv, 0) < -1)
+ invarg("invalid ELIM", *argv);
p->encap_limit = uval;
}
+ } else if (strcmp(*argv, "hoplimit") == 0) {
+ __u8 uval;
+ NEXT_ARG();
+ if (get_u8(&uval, *argv, 0))
+ invarg("invalid HLIM", *argv);
+ p->hop_limit = uval;
+ } else if (strcmp(*argv, "tc") == 0) {
+ __u8 uval;
+ NEXT_ARG();
+ if (strcmp(*argv, "inherit") == 0)
+ p->flags |= IP6_TNL_F_USE_ORIG_TCLASS;
+ else {
+ if (get_u8(&uval, *argv, 16))
+ invarg("invalid TC", *argv);
+ p->flowinfo |= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS;
+ p->flags &= ~IP6_TNL_F_USE_ORIG_TCLASS;
+ }
+ } else if (strcmp(*argv, "fl") == 0) {
+ __u32 uval;
+ NEXT_ARG();
+ if (strcmp(*argv, "inherit") == 0)
+ p->flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL;
+ else {
+ if (get_u32(&uval, *argv, 16))
+ invarg("invalid FL", *argv);
+ if (uval > 0xFFFFF)
+ invarg("invalid FL", *argv);
+ p->flowinfo |= htonl(uval) & IP6_FLOWINFO_FLOWLABEL;
+ p->flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
+ }
+ } else if (strcmp(*argv, "dscp") == 0) {
+ NEXT_ARG();
+ if (strcmp(*argv, "inherit") != 0)
+ invarg("not inherit", *argv);
+ p->flags |= IP6_TNL_F_RCV_DSCP_COPY;
} else {
- if (p->name[0])
+ if (strcmp(*argv, "name") == 0) {
+ NEXT_ARG();
+ }
+ if (matches(*argv, "help") == 0)
usage();
+ if (p->name[0])
+ duparg2("name", *argv);
strncpy(p->name, *argv, IFNAMSIZ - 1);
}
argc--; argv++;
}
if (medium[0]) {
- p->link = do_ioctl_get_ifindex(medium);
+ p->link = tnl_ioctl_get_ifindex(medium);
if (p->link == 0)
return -1;
}
return 0;
}
+static void ip6_tnl_parm_init(struct ip6_tnl_parm *p, int apply_default)
+{
+ memset(p, 0, sizeof(*p));
+ p->proto = IPPROTO_IPV6;
+ if (apply_default) {
+ p->hop_limit = DEFAULT_TNL_HOP_LIMIT;
+ p->encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT;
+ }
+}
+
+/*
+ * @p1: user specified parameter
+ * @p2: database entry
+ */
+static int ip6_tnl_parm_match(const struct ip6_tnl_parm *p1,
+ const struct ip6_tnl_parm *p2)
+{
+ return ((!p1->link || p1->link == p2->link) &&
+ (!p1->name[0] || strcmp(p1->name, p2->name) == 0) &&
+ (memcmp(&p1->laddr, &in6addr_any, sizeof(p1->laddr)) == 0 ||
+ memcmp(&p1->laddr, &p2->laddr, sizeof(p1->laddr)) == 0) &&
+ (memcmp(&p1->raddr, &in6addr_any, sizeof(p1->raddr)) == 0 ||
+ memcmp(&p1->raddr, &p2->raddr, sizeof(p1->raddr)) == 0) &&
+ (!p1->proto || !p2->proto || p1->proto == p2->proto) &&
+ (!p1->encap_limit || p1->encap_limit == p2->encap_limit) &&
+ (!p1->hop_limit || p1->hop_limit == p2->hop_limit) &&
+ (!(p1->flowinfo & IP6_FLOWINFO_TCLASS) ||
+ !((p1->flowinfo ^ p2->flowinfo) & IP6_FLOWINFO_TCLASS)) &&
+ (!(p1->flowinfo & IP6_FLOWINFO_FLOWLABEL) ||
+ !((p1->flowinfo ^ p2->flowinfo) & IP6_FLOWINFO_FLOWLABEL)) &&
+ (!p1->flags || (p1->flags & p2->flags)));
+}
+
+static int do_tunnels_list(struct ip6_tnl_parm *p)
+{
+ char buf[512];
+ int err = -1;
+ FILE *fp = fopen("/proc/net/dev", "r");
+ if (fp == NULL) {
+ perror("fopen");
+ goto end;
+ }
+
+ /* skip two lines at the begenning of the file */
+ fgets(buf, sizeof(buf), fp);
+ fgets(buf, sizeof(buf), fp);
+
+ while (fgets(buf, sizeof(buf), fp) != NULL) {
+ char name[IFNAMSIZ];
+ int type;
+ unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
+ rx_fifo, rx_frame,
+ tx_bytes, tx_packets, tx_errs, tx_drops,
+ tx_fifo, tx_colls, tx_carrier, rx_multi;
+ struct ip6_tnl_parm p1;
+ char *ptr;
+
+ buf[sizeof(buf) - 1] = '\0';
+ if ((ptr = strchr(buf, ':')) == NULL ||
+ (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
+ fprintf(stderr, "Wrong format of /proc/net/dev. Sorry.\n");
+ goto end;
+ }
+ if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
+ &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
+ &rx_fifo, &rx_frame, &rx_multi,
+ &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
+ &tx_fifo, &tx_colls, &tx_carrier) != 14)
+ continue;
+ if (p->name[0] && strcmp(p->name, name))
+ continue;
+ type = tnl_ioctl_get_iftype(name);
+ if (type == -1) {
+ fprintf(stderr, "Failed to get type of [%s]\n", name);
+ continue;
+ }
+ if (type != ARPHRD_TUNNEL6)
+ continue;
+ memset(&p1, 0, sizeof(p1));
+ ip6_tnl_parm_init(&p1, 0);
+ strcpy(p1.name, name);
+ p1.link = tnl_ioctl_get_ifindex(p1.name);
+ if (p1.link == 0)
+ continue;
+ if (tnl_get_ioctl(p1.name, &p1))
+ continue;
+ if (!ip6_tnl_parm_match(p, &p1))
+ continue;
+ print_tunnel(&p1);
+ if (show_stats) {
+ printf("%s", _SL_);
+ printf("RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts%s", _SL_);
+ printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s",
+ rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_);
+ printf("TX: Packets Bytes Errors DeadLoop NoRoute NoBufs%s", _SL_);
+ printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld",
+ tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
+ }
+ printf("\n");
+ }
+ err = 0;
+
+ end:
+ if (fp)
+ fclose(fp);
+ return err;
+}
+
static int do_show(int argc, char **argv)
{
- struct ipv6_tnl_parm p;
+ struct ip6_tnl_parm p;
+
+ ip6_tnl_parm_init(&p, 0);
if (parse_args(argc, argv, &p) < 0)
return -1;
- if (do_get_ioctl(p.name[0] ? p.name : "ip6tnl0", &p))
- return -1;
+ if (!p.name[0] || show_stats)
+ do_tunnels_list(&p);
+ else {
+ if (tnl_get_ioctl(p.name, &p))
+ return -1;
+ print_tunnel(&p);
+ printf("\n");
+ }
- print_tunnel(&p);
return 0;
}
-
-
-
static int do_add(int cmd, int argc, char **argv)
{
- struct ipv6_tnl_parm p;
+ struct ip6_tnl_parm p;
+
+ ip6_tnl_parm_init(&p, 1);
if (parse_args(argc, argv, &p) < 0)
return -1;
-
- return do_add_ioctl(cmd,
- cmd == SIOCCHGTUNNEL && p.name[0] ?
- p.name : "ip6tnl0", &p);
+
+ return tnl_add_ioctl(cmd,
+ cmd == SIOCCHGTUNNEL && p.name[0] ?
+ p.name : "ip6tnl0", p.name, &p);
}
-int do_del(int argc, char **argv)
+static int do_del(int argc, char **argv)
{
- struct ipv6_tnl_parm p;
+ struct ip6_tnl_parm p;
+
+ ip6_tnl_parm_init(&p, 1);
if (parse_args(argc, argv, &p) < 0)
return -1;
- return do_del_ioctl(p.name[0] ? p.name : "ip6tnl0", &p);
+ return tnl_del_ioctl(p.name[0] ? p.name : "ip6tnl0", p.name, &p);
}
-
-int main(int argc, char **argv)
+int do_ip6tunnel(int argc, char **argv)
{
- argc--;
- argv++;
- if (argc > 0) {
- if (strcmp(*argv, "add") == 0)
- return do_add(SIOCADDTUNNEL, argc - 1, argv + 1);
- else if (strcmp(*argv, "change") == 0)
- return do_add(SIOCCHGTUNNEL, argc - 1, argv + 1);
- else if (strcmp(*argv, "del") == 0)
- return do_del(argc - 1, argv + 1);
- else if (strcmp(*argv, "show") == 0)
- return do_show(argc - 1, argv + 1);
- else
- usage();
+ switch (preferred_family) {
+ case AF_UNSPEC:
+ preferred_family = AF_INET6;
+ break;
+ case AF_INET6:
+ break;
+ default:
+ fprintf(stderr, "Unsupported 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, "del") == 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, "help") == 0)
+ usage();
} else
return do_show(0, NULL);
- return 0;
+ fprintf(stderr, "Command \"%s\" is unknown, try \"ip -f inet6 tunnel help\".\n", *argv);
+ exit(-1);
}