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14645ec231
mirror_iproute2/ip/iptunnel.c
Kees van Reeuwijk 14645ec231 iproute2: improved error messages 
This patch improves many error messages as follows:
- For incorrect parameters, show the value of the offending parameter, rather than just say that it is incorrect
- Rephrased messages for clarity
- Rephrased to more `mainstream' english

Signed-off-by: Kees van Reeuwijk <reeuwijk@few.vu.nl>
2013-02-11 09:22:22 -08:00

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/*
* 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 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) {
if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
exit(-1);
}
p->iph.protocol = IPPROTO_IPIP;
} else if (strcmp(*argv, "gre") == 0 ||
strcmp(*argv, "gre/ip") == 0) {
if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) {
fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
exit(-1);
}
p->iph.protocol = IPPROTO_GRE;
} else if (strcmp(*argv, "sit") == 0 ||
strcmp(*argv, "ipv6/ip") == 0) {
if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
exit(-1);
}
p->iph.protocol = IPPROTO_IPV6;
} else if (strcmp(*argv, "isatap") == 0) {
if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
fprintf(stderr, "You managed to ask for more than one tunnel mode.\n");
exit(-1);
}
p->iph.protocol = IPPROTO_IPV6;
isatap++;
} else if (strcmp(*argv, "vti") == 0) {
if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
fprintf(stderr, "You managed to ask for more than one tunnel mode.\n");
exit(-1);
}
p->iph.protocol = IPPROTO_IPIP;
p->i_flags |= VTI_ISVTI;
} else {
fprintf(stderr,"Unknown tunnel mode \"%s\"\n", *argv);
exit(-1);
}
} else if (strcmp(*argv, "key") == 0) {
unsigned uval;
NEXT_ARG();
p->i_flags |= GRE_KEY;
p->o_flags |= GRE_KEY;
if (strchr(*argv, '.'))
p->i_key = p->o_key = get_addr32(*argv);
else {
if (get_unsigned(&uval, *argv, 0)<0) {
fprintf(stderr, "invalid value for \"key\": \"%s\"; it should be an unsigned integer\n", *argv);
exit(-1);
}
p->i_key = p->o_key = htonl(uval);
}
} else if (strcmp(*argv, "ikey") == 0) {
unsigned uval;
NEXT_ARG();
p->i_flags |= GRE_KEY;
if (strchr(*argv, '.'))
p->i_key = get_addr32(*argv);
else {
if (get_unsigned(&uval, *argv, 0)<0) {
fprintf(stderr, "invalid value for \"ikey\": \"%s\"; it should be an unsigned integer\n", *argv);
exit(-1);
}
p->i_key = htonl(uval);
}
} else if (strcmp(*argv, "okey") == 0) {
unsigned uval;
NEXT_ARG();
p->o_flags |= GRE_KEY;
if (strchr(*argv, '.'))
p->o_key = get_addr32(*argv);
else {
if (get_unsigned(&uval, *argv, 0)<0) {
fprintf(stderr, "invalid value for \"okey\": \"%s\"; it should be an unsigned integer\n", *argv);
exit(-1);
}
p->o_key = htonl(uval);
}
} 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 if (strcmp(*argv, "local") == 0) {
NEXT_ARG();
if (strcmp(*argv, "any"))
p->iph.saddr = get_addr32(*argv);
} else if (strcmp(*argv, "dev") == 0) {
NEXT_ARG();
strncpy(medium, *argv, IFNAMSIZ-1);
} else if (strcmp(*argv, "ttl") == 0 ||
strcmp(*argv, "hoplimit") == 0) {
unsigned uval;
NEXT_ARG();
if (strcmp(*argv, "inherit") != 0) {
if (get_unsigned(&uval, *argv, 0))
invarg("invalid TTL\n", *argv);
if (uval > 255)
invarg("TTL must be <=255\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);
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->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) {
if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
fprintf(stderr, "Keys are not allowed with ipip and sit tunnels\n");
return -1;
}
}
if (medium[0]) {
p->link = if_nametoindex(medium);
if (p->link == 0)
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 int do_add(int cmd, int argc, char **argv)
{
struct ip_tunnel_parm p;
if (parse_args(argc, argv, cmd, &p) < 0)
return -1;
if (p.iph.ttl && p.iph.frag_off == 0) {
fprintf(stderr, "ttl != 0 and noptmudisc are incompatible\n");
return -1;
}
switch (p.iph.protocol) {
case IPPROTO_IPIP:
if (p.i_flags != VTI_ISVTI)
return tnl_add_ioctl(cmd, "tunl0", p.name, &p);
else
return tnl_add_ioctl(cmd, "ip_vti0", p.name, &p);
case IPPROTO_GRE:
return tnl_add_ioctl(cmd, "gre0", p.name, &p);
case IPPROTO_IPV6:
return tnl_add_ioctl(cmd, "sit0", p.name, &p);
default:
fprintf(stderr, "cannot determine tunnel mode (ipip, gre, vti or sit)\n");
return -1;
}
return -1;
}
static int do_del(int argc, char **argv)
{
struct ip_tunnel_parm p;
if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
return -1;
switch (p.iph.protocol) {
case IPPROTO_IPIP:
if (p.i_flags != VTI_ISVTI)
return tnl_del_ioctl("tunl0", p.name, &p);
else
return tnl_del_ioctl("ip_vti0", p.name, &p);
case IPPROTO_GRE:
return tnl_del_ioctl("gre0", p.name, &p);
case IPPROTO_IPV6:
return tnl_del_ioctl("sit0", p.name, &p);
default:
return tnl_del_ioctl(p.name, p.name, &p);
}
return -1;
}
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->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 < sizeof(prl) / sizeof(prl[0]); 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.\n", _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 name[IFNAMSIZ];
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 ip_tunnel_parm p1;
char buf[512];
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");
fclose(fp);
return -1;
}
while (fgets(buf, sizeof(buf), fp) != NULL) {
int index, type;
char *ptr;
buf[sizeof(buf) - 1] = 0;
if ((ptr = strchr(buf, ':')) == NULL ||
(*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
fprintf(stderr, "Wrong format for /proc/net/dev. Giving up.\n");
fclose(fp);
return -1;
}
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;
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) {
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");
}
fclose(fp);
return 0;
}
static int do_show(int argc, char **argv)
{
int err;
struct ip_tunnel_parm p;
ll_init_map(&rth);
if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
return -1;
switch (p.iph.protocol) {
case IPPROTO_IPIP:
if (p.i_flags != VTI_ISVTI)
err = tnl_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
else
err = tnl_get_ioctl(p.name[0] ? p.name : "ip_vti0", &p);
break;
case IPPROTO_GRE:
err = tnl_get_ioctl(p.name[0] ? p.name : "gre0", &p);
break;
case IPPROTO_IPV6:
err = tnl_get_ioctl(p.name[0] ? p.name : "sit0", &p);
break;
default:
do_tunnels_list(&p);
return 0;
}
if (err)
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);
}
int do_iptunnel(int argc, char **argv)
{
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);
}
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