/* vi: set sw=4 ts=4: */
/*
- * iptunnel.c "ip tunnel"
- *
- * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
- *
- * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*
+ * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
* Changes:
*
- * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
- * Rani Assaf <rani@magic.metawire.com> 980930: do not allow key for ipip/sit
- * Phil Karn <karn@ka9q.ampr.org> 990408: "pmtudisc" flag
+ * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
+ * Rani Assaf <rani@magic.metawire.com> 980930: do not allow key for ipip/sit
+ * Phil Karn <karn@ka9q.ampr.org> 990408: "pmtudisc" flag
*/
-#include "libbb.h"
-#include <sys/socket.h>
-#include <sys/ioctl.h>
-
#include <netinet/ip.h>
-
#include <net/if.h>
#include <net/if_arp.h>
-
#include <asm/types.h>
+
#ifndef __constant_htons
#define __constant_htons htons
#endif
-#include <linux/if_tunnel.h>
+// FYI: #define SIOCDEVPRIVATE 0x89F0
+
+/* From linux/if_tunnel.h. #including it proved troublesome
+ * (redefiniton errors due to name collisions in linux/ and net[inet]/) */
+#define SIOCGETTUNNEL (SIOCDEVPRIVATE + 0)
+#define SIOCADDTUNNEL (SIOCDEVPRIVATE + 1)
+#define SIOCDELTUNNEL (SIOCDEVPRIVATE + 2)
+#define SIOCCHGTUNNEL (SIOCDEVPRIVATE + 3)
+//#define SIOCGETPRL (SIOCDEVPRIVATE + 4)
+//#define SIOCADDPRL (SIOCDEVPRIVATE + 5)
+//#define SIOCDELPRL (SIOCDEVPRIVATE + 6)
+//#define SIOCCHGPRL (SIOCDEVPRIVATE + 7)
+#define GRE_CSUM __constant_htons(0x8000)
+//#define GRE_ROUTING __constant_htons(0x4000)
+#define GRE_KEY __constant_htons(0x2000)
+#define GRE_SEQ __constant_htons(0x1000)
+//#define GRE_STRICT __constant_htons(0x0800)
+//#define GRE_REC __constant_htons(0x0700)
+//#define GRE_FLAGS __constant_htons(0x00F8)
+//#define GRE_VERSION __constant_htons(0x0007)
+struct ip_tunnel_parm {
+ char name[IFNAMSIZ];
+ int link;
+ uint16_t i_flags;
+ uint16_t o_flags;
+ uint32_t i_key;
+ uint32_t o_key;
+ struct iphdr iph;
+};
+/* SIT-mode i_flags */
+//#define SIT_ISATAP 0x0001
+//struct ip_tunnel_prl {
+// uint32_t addr;
+// uint16_t flags;
+// uint16_t __reserved;
+// uint32_t datalen;
+// uint32_t __reserved2;
+// /* data follows */
+//};
+///* PRL flags */
+//#define PRL_DEFAULT 0x0001
+
+#include "ip_common.h" /* #include "libbb.h" is inside */
#include "rt_names.h"
#include "utils.h"
-#include "ip_common.h"
/* Dies on error */
struct ifreq ifr;
int fd;
- strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
+ strncpy_IFNAMSIZ(ifr.ifr_name, dev);
fd = xsocket(AF_INET, SOCK_DGRAM, 0);
- if (ioctl(fd, SIOCGIFINDEX, &ifr)) {
- bb_perror_msg_and_die("SIOCGIFINDEX");
- }
+ xioctl(fd, SIOCGIFINDEX, &ifr);
close(fd);
return ifr.ifr_ifindex;
}
{
struct ifreq ifr;
int fd;
+ int err;
- strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
+ strncpy_IFNAMSIZ(ifr.ifr_name, dev);
fd = xsocket(AF_INET, SOCK_DGRAM, 0);
- if (ioctl(fd, SIOCGIFHWADDR, &ifr)) {
- bb_perror_msg("SIOCGIFHWADDR");
- return -1;
- }
+ err = ioctl_or_warn(fd, SIOCGIFHWADDR, &ifr);
close(fd);
- return ifr.ifr_addr.sa_family;
+ return err ? -1 : ifr.ifr_addr.sa_family;
}
static char *do_ioctl_get_ifname(int idx)
{
struct ifreq ifr;
int fd;
+ int err;
ifr.ifr_ifindex = idx;
fd = xsocket(AF_INET, SOCK_DGRAM, 0);
- if (ioctl(fd, SIOCGIFNAME, &ifr)) {
- bb_perror_msg("SIOCGIFNAME");
- return NULL;
- }
+ err = ioctl_or_warn(fd, SIOCGIFNAME, &ifr);
close(fd);
- return xstrndup(ifr.ifr_name, sizeof(ifr.ifr_name));
+ return err ? NULL : xstrndup(ifr.ifr_name, sizeof(ifr.ifr_name));
}
static int do_get_ioctl(const char *basedev, struct ip_tunnel_parm *p)
int fd;
int err;
- strncpy(ifr.ifr_name, basedev, sizeof(ifr.ifr_name));
+ strncpy_IFNAMSIZ(ifr.ifr_name, basedev);
ifr.ifr_ifru.ifru_data = (void*)p;
fd = xsocket(AF_INET, SOCK_DGRAM, 0);
- err = ioctl(fd, SIOCGETTUNNEL, &ifr);
- if (err) {
- bb_perror_msg("SIOCGETTUNNEL");
- }
+ err = ioctl_or_warn(fd, SIOCGETTUNNEL, &ifr);
close(fd);
return err;
}
int fd;
if (cmd == SIOCCHGTUNNEL && p->name[0]) {
- strncpy(ifr.ifr_name, p->name, sizeof(ifr.ifr_name));
+ strncpy_IFNAMSIZ(ifr.ifr_name, p->name);
} else {
- strncpy(ifr.ifr_name, basedev, sizeof(ifr.ifr_name));
+ strncpy_IFNAMSIZ(ifr.ifr_name, basedev);
}
ifr.ifr_ifru.ifru_data = (void*)p;
fd = xsocket(AF_INET, SOCK_DGRAM, 0);
- if (ioctl(fd, cmd, &ifr)) {
- bb_perror_msg_and_die("ioctl");
- }
+#if ENABLE_IOCTL_HEX2STR_ERROR
+ /* #define magic will turn ioctl# into string */
+ if (cmd == SIOCCHGTUNNEL)
+ xioctl(fd, SIOCCHGTUNNEL, &ifr);
+ else
+ xioctl(fd, SIOCADDTUNNEL, &ifr);
+#else
+ xioctl(fd, cmd, &ifr);
+#endif
close(fd);
return 0;
}
int fd;
if (p->name[0]) {
- strncpy(ifr.ifr_name, p->name, sizeof(ifr.ifr_name));
+ strncpy_IFNAMSIZ(ifr.ifr_name, p->name);
} else {
- strncpy(ifr.ifr_name, basedev, sizeof(ifr.ifr_name));
+ strncpy_IFNAMSIZ(ifr.ifr_name, basedev);
}
ifr.ifr_ifru.ifru_data = (void*)p;
fd = xsocket(AF_INET, SOCK_DGRAM, 0);
- if (ioctl(fd, SIOCDELTUNNEL, &ifr)) {
- bb_perror_msg_and_die("SIOCDELTUNNEL");
- }
+ xioctl(fd, SIOCDELTUNNEL, &ifr);
close(fd);
return 0;
}
/* Dies on error */
-static void parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
+static void parse_args(char **argv, int cmd, struct ip_tunnel_parm *p)
{
+ static const char keywords[] ALIGN1 =
+ "mode\0""ipip\0""ip/ip\0""gre\0""gre/ip\0""sit\0""ipv6/ip\0"
+ "key\0""ikey\0""okey\0""seq\0""iseq\0""oseq\0"
+ "csum\0""icsum\0""ocsum\0""nopmtudisc\0""pmtudisc\0"
+ "remote\0""any\0""local\0""dev\0"
+ "ttl\0""inherit\0""tos\0""dsfield\0"
+ "name\0";
+ enum {
+ ARG_mode, ARG_ipip, ARG_ip_ip, ARG_gre, ARG_gre_ip, ARG_sit, ARG_ip6_ip,
+ ARG_key, ARG_ikey, ARG_okey, ARG_seq, ARG_iseq, ARG_oseq,
+ ARG_csum, ARG_icsum, ARG_ocsum, ARG_nopmtudisc, ARG_pmtudisc,
+ ARG_remote, ARG_any, ARG_local, ARG_dev,
+ ARG_ttl, ARG_inherit, ARG_tos, ARG_dsfield,
+ ARG_name
+ };
int count = 0;
char medium[IFNAMSIZ];
+ int key;
+
memset(p, 0, sizeof(*p));
- memset(&medium, 0, sizeof(medium));
+ medium[0] = '\0';
p->iph.version = 4;
p->iph.ihl = 5;
#ifndef IP_DF
-#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
+#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
#endif
p->iph.frag_off = htons(IP_DF);
- while (argc > 0) {
- if (strcmp(*argv, "mode") == 0) {
+ while (*argv) {
+ key = index_in_strings(keywords, *argv);
+ if (key == ARG_mode) {
NEXT_ARG();
- if (strcmp(*argv, "ipip") == 0 ||
- strcmp(*argv, "ip/ip") == 0) {
+ key = index_in_strings(keywords, *argv);
+ if (key == ARG_ipip ||
+ key == ARG_ip_ip
+ ) {
if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
- bb_error_msg_and_die("you managed to ask for more than one tunnel mode");
+ bb_error_msg_and_die("%s tunnel mode", "you managed to ask for more than one");
}
p->iph.protocol = IPPROTO_IPIP;
- } else if (strcmp(*argv, "gre") == 0 ||
- strcmp(*argv, "gre/ip") == 0) {
+ } else if (key == ARG_gre ||
+ key == ARG_gre_ip
+ ) {
if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) {
- bb_error_msg_and_die("you managed to ask for more than one tunnel mode");
+ bb_error_msg_and_die("%s tunnel mode", "you managed to ask for more than one");
}
p->iph.protocol = IPPROTO_GRE;
- } else if (strcmp(*argv, "sit") == 0 ||
- strcmp(*argv, "ipv6/ip") == 0) {
+ } else if (key == ARG_sit ||
+ key == ARG_ip6_ip
+ ) {
if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
- bb_error_msg_and_die("you managed to ask for more than one tunnel mode");
+ bb_error_msg_and_die("%s tunnel mode", "you managed to ask for more than one");
}
p->iph.protocol = IPPROTO_IPV6;
} else {
- bb_error_msg_and_die("cannot guess tunnel mode");
+ bb_error_msg_and_die("%s tunnel mode", "can't guess");
}
- } else if (strcmp(*argv, "key") == 0) {
+ } else if (key == ARG_key) {
unsigned uval;
NEXT_ARG();
p->i_flags |= GRE_KEY;
if (strchr(*argv, '.'))
p->i_key = p->o_key = get_addr32(*argv);
else {
- if (get_unsigned(&uval, *argv, 0)<0) {
- bb_error_msg_and_die("invalid value of \"key\"");
- }
+ uval = get_unsigned(*argv, "key");
p->i_key = p->o_key = htonl(uval);
}
- } else if (strcmp(*argv, "ikey") == 0) {
+ } else if (key == ARG_ikey) {
unsigned uval;
NEXT_ARG();
p->i_flags |= GRE_KEY;
if (strchr(*argv, '.'))
p->o_key = get_addr32(*argv);
else {
- if (get_unsigned(&uval, *argv, 0)<0) {
- bb_error_msg_and_die("invalid value of \"ikey\"");
- }
+ uval = get_unsigned(*argv, "ikey");
p->i_key = htonl(uval);
}
- } else if (strcmp(*argv, "okey") == 0) {
+ } else if (key == ARG_okey) {
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) {
- bb_error_msg_and_die("invalid value of \"okey\"");
- }
+ uval = get_unsigned(*argv, "okey");
p->o_key = htonl(uval);
}
- } else if (strcmp(*argv, "seq") == 0) {
+ } else if (key == ARG_seq) {
p->i_flags |= GRE_SEQ;
p->o_flags |= GRE_SEQ;
- } else if (strcmp(*argv, "iseq") == 0) {
+ } else if (key == ARG_iseq) {
p->i_flags |= GRE_SEQ;
- } else if (strcmp(*argv, "oseq") == 0) {
+ } else if (key == ARG_oseq) {
p->o_flags |= GRE_SEQ;
- } else if (strcmp(*argv, "csum") == 0) {
+ } else if (key == ARG_csum) {
p->i_flags |= GRE_CSUM;
p->o_flags |= GRE_CSUM;
- } else if (strcmp(*argv, "icsum") == 0) {
+ } else if (key == ARG_icsum) {
p->i_flags |= GRE_CSUM;
- } else if (strcmp(*argv, "ocsum") == 0) {
+ } else if (key == ARG_ocsum) {
p->o_flags |= GRE_CSUM;
- } else if (strcmp(*argv, "nopmtudisc") == 0) {
+ } else if (key == ARG_nopmtudisc) {
p->iph.frag_off = 0;
- } else if (strcmp(*argv, "pmtudisc") == 0) {
+ } else if (key == ARG_pmtudisc) {
p->iph.frag_off = htons(IP_DF);
- } else if (strcmp(*argv, "remote") == 0) {
+ } else if (key == ARG_remote) {
NEXT_ARG();
- if (strcmp(*argv, "any"))
+ key = index_in_strings(keywords, *argv);
+ if (key != ARG_any)
p->iph.daddr = get_addr32(*argv);
- } else if (strcmp(*argv, "local") == 0) {
+ } else if (key == ARG_local) {
NEXT_ARG();
- if (strcmp(*argv, "any"))
+ key = index_in_strings(keywords, *argv);
+ if (key != ARG_any)
p->iph.saddr = get_addr32(*argv);
- } else if (strcmp(*argv, "dev") == 0) {
+ } else if (key == ARG_dev) {
NEXT_ARG();
- strncpy(medium, *argv, IFNAMSIZ-1);
- } else if (strcmp(*argv, "ttl") == 0) {
+ strncpy_IFNAMSIZ(medium, *argv);
+ } else if (key == ARG_ttl) {
unsigned uval;
NEXT_ARG();
- if (strcmp(*argv, "inherit") != 0) {
- if (get_unsigned(&uval, *argv, 0))
- invarg(*argv, "TTL");
+ key = index_in_strings(keywords, *argv);
+ if (key != ARG_inherit) {
+ uval = get_unsigned(*argv, "TTL");
if (uval > 255)
invarg(*argv, "TTL must be <=255");
p->iph.ttl = uval;
}
- } else if (strcmp(*argv, "tos") == 0 ||
- matches(*argv, "dsfield") == 0) {
+ } else if (key == ARG_tos ||
+ key == ARG_dsfield
+ ) {
uint32_t uval;
NEXT_ARG();
- if (strcmp(*argv, "inherit") != 0) {
+ key = index_in_strings(keywords, *argv);
+ if (key != ARG_inherit) {
if (rtnl_dsfield_a2n(&uval, *argv))
invarg(*argv, "TOS");
p->iph.tos = uval;
} else
p->iph.tos = 1;
} else {
- if (strcmp(*argv, "name") == 0) {
+ if (key == ARG_name) {
NEXT_ARG();
}
if (p->name[0])
duparg2("name", *argv);
- strncpy(p->name, *argv, IFNAMSIZ);
+ strncpy_IFNAMSIZ(p->name, *argv);
if (cmd == SIOCCHGTUNNEL && count == 0) {
struct ip_tunnel_parm old_p;
memset(&old_p, 0, sizeof(old_p));
if (do_get_ioctl(*argv, &old_p))
- exit(1);
+ exit(EXIT_FAILURE);
*p = old_p;
}
}
count++;
- argc--;
argv++;
}
}
}
-
/* Return value becomes exitcode. It's okay to not return at all */
-static int do_add(int cmd, int argc, char **argv)
+static int do_add(int cmd, char **argv)
{
struct ip_tunnel_parm p;
- parse_args(argc, argv, cmd, &p);
+ parse_args(argv, cmd, &p);
if (p.iph.ttl && p.iph.frag_off == 0) {
bb_error_msg_and_die("ttl != 0 and noptmudisc are incompatible");
case IPPROTO_IPV6:
return do_add_ioctl(cmd, "sit0", &p);
default:
- bb_error_msg_and_die("cannot determine tunnel mode (ipip, gre or sit)");
+ bb_error_msg_and_die("can't determine tunnel mode (ipip, gre or sit)");
}
}
/* Return value becomes exitcode. It's okay to not return at all */
-static int do_del(int argc, char **argv)
+static int do_del(char **argv)
{
struct ip_tunnel_parm p;
- parse_args(argc, argv, SIOCDELTUNNEL, &p);
+ parse_args(argv, SIOCDELTUNNEL, &p);
switch (p.iph.protocol) {
case IPPROTO_IPIP:
printf(" inherit");
if (p->iph.tos & ~1)
printf("%c%s ", p->iph.tos & 1 ? '/' : ' ',
- rtnl_dsfield_n2a(p->iph.tos & ~1, b1, sizeof(b1)));
+ rtnl_dsfield_n2a(p->iph.tos & ~1, b1));
}
if (!(p->iph.frag_off & htons(IP_DF)))
printf(" nopmtudisc");
int type;
struct ip_tunnel_parm p1;
char buf[512];
- FILE *fp = fopen("/proc/net/dev", "r");
+ FILE *fp = fopen_or_warn("/proc/net/dev", "r");
if (fp == NULL) {
- bb_perror_msg("fopen");
return;
}
-
+ /* skip headers */
fgets(buf, sizeof(buf), fp);
fgets(buf, sizeof(buf), fp);
/*buf[sizeof(buf) - 1] = 0; - fgets is safe anyway */
ptr = strchr(buf, ':');
if (ptr == NULL ||
- (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
- bb_error_msg("wrong format of /proc/net/dev. Sorry");
+ (*ptr++ = 0, sscanf(buf, "%s", name) != 1)
+ ) {
+ bb_error_msg("wrong format of /proc/net/dev");
return;
}
if (sscanf(ptr, "%lu%lu%lu%lu%lu%lu%lu%*d%lu%lu%lu%lu%lu%lu%lu",
continue;
type = do_ioctl_get_iftype(name);
if (type == -1) {
- bb_error_msg("cannot get type of [%s]", name);
+ bb_error_msg("can't get type of [%s]", name);
continue;
}
if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
(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))
+ (p->i_key && p1.i_key != p->i_key)
+ ) {
continue;
+ }
print_tunnel(&p1);
- puts("");
+ bb_putchar('\n');
}
}
/* Return value becomes exitcode. It's okay to not return at all */
-static int do_show(int argc, char **argv)
+static int do_show(char **argv)
{
int err;
struct ip_tunnel_parm p;
- parse_args(argc, argv, SIOCGETTUNNEL, &p);
+ parse_args(argv, SIOCGETTUNNEL, &p);
switch (p.iph.protocol) {
case IPPROTO_IPIP:
return -1;
print_tunnel(&p);
- puts("");
+ bb_putchar('\n');
return 0;
}
/* Return value becomes exitcode. It's okay to not return at all */
-int do_iptunnel(int argc, char **argv)
+int FAST_FUNC do_iptunnel(char **argv)
{
- 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);
- } else
- return do_show(0, NULL);
-
- bb_error_msg_and_die("command \"%s\" is unknown", *argv);
+ static const char keywords[] ALIGN1 =
+ "add\0""change\0""delete\0""show\0""list\0""lst\0";
+ enum { ARG_add = 0, ARG_change, ARG_del, ARG_show, ARG_list, ARG_lst };
+
+ if (*argv) {
+ int key = index_in_substrings(keywords, *argv);
+ if (key < 0)
+ invarg(*argv, applet_name);
+ argv++;
+ if (key == ARG_add)
+ return do_add(SIOCADDTUNNEL, argv);
+ if (key == ARG_change)
+ return do_add(SIOCCHGTUNNEL, argv);
+ if (key == ARG_del)
+ return do_del(argv);
+ }
+ return do_show(argv);
}
projects / oweals / busybox.git / blobdiff