networking/libiproute/iptunnel.c

/* 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>
 *
 * 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
 */

#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

// 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"


/* Dies on error */
static int do_ioctl_get_ifindex(char *dev)
{
	struct ifreq ifr;
	int fd;

	strncpy_IFNAMSIZ(ifr.ifr_name, dev);
	fd = xsocket(AF_INET, SOCK_DGRAM, 0);
	xioctl(fd, SIOCGIFINDEX, &ifr);
	close(fd);
	return ifr.ifr_ifindex;
}

static int do_ioctl_get_iftype(char *dev)
{
	struct ifreq ifr;
	int fd;
	int err;

	strncpy_IFNAMSIZ(ifr.ifr_name, dev);
	fd = xsocket(AF_INET, SOCK_DGRAM, 0);
	err = ioctl_or_warn(fd, SIOCGIFHWADDR, &ifr);
	close(fd);
	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);
	err = ioctl_or_warn(fd, SIOCGIFNAME, &ifr);
	close(fd);
	return err ? NULL : xstrndup(ifr.ifr_name, sizeof(ifr.ifr_name));
}

static int do_get_ioctl(const char *basedev, struct ip_tunnel_parm *p)
{
	struct ifreq ifr;
	int fd;
	int err;

	strncpy_IFNAMSIZ(ifr.ifr_name, basedev);
	ifr.ifr_ifru.ifru_data = (void*)p;
	fd = xsocket(AF_INET, SOCK_DGRAM, 0);
	err = ioctl_or_warn(fd, SIOCGETTUNNEL, &ifr);
	close(fd);
	return err;
}

/* Dies on error, otherwise returns 0 */
static int do_add_ioctl(int cmd, const char *basedev, struct ip_tunnel_parm *p)
{
	struct ifreq ifr;
	int fd;

	if (cmd == SIOCCHGTUNNEL && p->name[0]) {
		strncpy_IFNAMSIZ(ifr.ifr_name, p->name);
	} else {
		strncpy_IFNAMSIZ(ifr.ifr_name, basedev);
	}
	ifr.ifr_ifru.ifru_data = (void*)p;
	fd = xsocket(AF_INET, SOCK_DGRAM, 0);
#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;
}

/* Dies on error, otherwise returns 0 */
static int do_del_ioctl(const char *basedev, struct ip_tunnel_parm *p)
{
	struct ifreq ifr;
	int fd;

	if (p->name[0]) {
		strncpy_IFNAMSIZ(ifr.ifr_name, p->name);
	} else {
		strncpy_IFNAMSIZ(ifr.ifr_name, basedev);
	}
	ifr.ifr_ifru.ifru_data = (void*)p;
	fd = xsocket(AF_INET, SOCK_DGRAM, 0);
	xioctl(fd, SIOCDELTUNNEL, &ifr);
	close(fd);
	return 0;
}

/* Dies on error */
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));
	medium[0] = '\0';

	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 (*argv) {
		key = index_in_strings(keywords, *argv);
		if (key == ARG_mode) {
			NEXT_ARG();
			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("%s tunnel mode", "you managed to ask for more than one");
				}
				p->iph.protocol = IPPROTO_IPIP;
			} else if (key == ARG_gre ||
				   key == ARG_gre_ip
			) {
				if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) {
					bb_error_msg_and_die("%s tunnel mode", "you managed to ask for more than one");
				}
				p->iph.protocol = IPPROTO_GRE;
			} else if (key == ARG_sit ||
				   key == ARG_ip6_ip
			) {
				if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
					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("%s tunnel mode", "can't guess");
			}
		} else if (key == ARG_key) {
			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 {
				uval = get_unsigned(*argv, "key");
				p->i_key = p->o_key = htonl(uval);
			}
		} else if (key == ARG_ikey) {
			unsigned uval;
			NEXT_ARG();
			p->i_flags |= GRE_KEY;
			if (strchr(*argv, '.'))
				p->o_key = get_addr32(*argv);
			else {
				uval = get_unsigned(*argv, "ikey");
				p->i_key = htonl(uval);
			}
		} else if (key == ARG_okey) {
			unsigned uval;
			NEXT_ARG();
			p->o_flags |= GRE_KEY;
			if (strchr(*argv, '.'))
				p->o_key = get_addr32(*argv);
			else {
				uval = get_unsigned(*argv, "okey");
				p->o_key = htonl(uval);
			}
		} else if (key == ARG_seq) {
			p->i_flags |= GRE_SEQ;
			p->o_flags |= GRE_SEQ;
		} else if (key == ARG_iseq) {
			p->i_flags |= GRE_SEQ;
		} else if (key == ARG_oseq) {
			p->o_flags |= GRE_SEQ;
		} else if (key == ARG_csum) {
			p->i_flags |= GRE_CSUM;
			p->o_flags |= GRE_CSUM;
		} else if (key == ARG_icsum) {
			p->i_flags |= GRE_CSUM;
		} else if (key == ARG_ocsum) {
			p->o_flags |= GRE_CSUM;
		} else if (key == ARG_nopmtudisc) {
			p->iph.frag_off = 0;
		} else if (key == ARG_pmtudisc) {
			p->iph.frag_off = htons(IP_DF);
		} else if (key == ARG_remote) {
			NEXT_ARG();
			key = index_in_strings(keywords, *argv);
			if (key != ARG_any)
				p->iph.daddr = get_addr32(*argv);
		} else if (key == ARG_local) {
			NEXT_ARG();
			key = index_in_strings(keywords, *argv);
			if (key != ARG_any)
				p->iph.saddr = get_addr32(*argv);
		} else if (key == ARG_dev) {
			NEXT_ARG();
			strncpy_IFNAMSIZ(medium, *argv);
		} else if (key == ARG_ttl) {
			unsigned uval;
			NEXT_ARG();
			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 (key == ARG_tos ||
			   key == ARG_dsfield
		) {
			uint32_t uval;
			NEXT_ARG();
			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 (key == ARG_name) {
				NEXT_ARG();
			}
			if (p->name[0])
				duparg2("name", *argv);
			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(EXIT_FAILURE);
				*p = old_p;
			}
		}
		count++;
		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;
	}

	if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) {
		if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
			bb_error_msg_and_die("keys are not allowed with ipip and sit");
		}
	}

	if (medium[0]) {
		p->link = do_ioctl_get_ifindex(medium);
	}

	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) {
		bb_error_msg_and_die("broadcast tunnel requires a source address");
	}
}

/* Return value becomes exitcode. It's okay to not return at all */
static int do_add(int cmd, char **argv)
{
	struct ip_tunnel_parm 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");
	}

	switch (p.iph.protocol) {
	case IPPROTO_IPIP:
		return do_add_ioctl(cmd, "tunl0", &p);
	case IPPROTO_GRE:
		return do_add_ioctl(cmd, "gre0", &p);
	case IPPROTO_IPV6:
		return do_add_ioctl(cmd, "sit0", &p);
	default:
		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(char **argv)
{
	struct ip_tunnel_parm p;

	parse_args(argv, SIOCDELTUNNEL, &p);

	switch (p.iph.protocol) {
	case IPPROTO_IPIP:
		return do_del_ioctl("tunl0", &p);
	case IPPROTO_GRE:
		return do_del_ioctl("gre0", &p);
	case IPPROTO_IPV6:
		return do_del_ioctl("sit0", &p);
	default:
		return do_del_ioctl(p.name, &p);
	}
}

static void print_tunnel(struct ip_tunnel_parm *p)
{
	char s1[256];
	char s2[256];
	char s3[64];
	char s4[64];

	format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1));
	format_host(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2));
	inet_ntop(AF_INET, &p->i_key, s3, sizeof(s3));
	inet_ntop(AF_INET, &p->o_key, s4, sizeof(s4));

	printf("%s: %s/ip  remote %s  local %s ",
	       p->name,
	       p->iph.protocol == IPPROTO_IPIP ? "ip" :
	       (p->iph.protocol == IPPROTO_GRE ? "gre" :
		(p->iph.protocol == IPPROTO_IPV6 ? "ipv6" : "unknown")),
	       p->iph.daddr ? s1 : "any", p->iph.saddr ? s2 : "any");
	if (p->link) {
		char *n = do_ioctl_get_ifname(p->link);
		if (n) {
			printf(" dev %s ", n);
			free(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));
	}
	if (!(p->iph.frag_off & htons(IP_DF)))
		printf(" nopmtudisc");

	if ((p->i_flags & GRE_KEY) && (p->o_flags & GRE_KEY) && p->o_key == p->i_key)
		printf(" key %s", s3);
	else if ((p->i_flags | p->o_flags) & GRE_KEY) {
		if (p->i_flags & GRE_KEY)
			printf(" ikey %s ", s3);
		if (p->o_flags & GRE_KEY)
			printf(" okey %s ", s4);
	}

	if (p->i_flags & GRE_SEQ)
		printf("%c  Drop packets out of sequence.\n", _SL_);
	if (p->i_flags & GRE_CSUM)
		printf("%c  Checksum in received packet is required.", _SL_);
	if (p->o_flags & GRE_SEQ)
		printf("%c  Sequence packets on output.", _SL_);
	if (p->o_flags & GRE_CSUM)
		printf("%c  Checksum output packets.", _SL_);
}

static void 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;
	int type;
	struct ip_tunnel_parm p1;
	char buf[512];
	FILE *fp = fopen_or_warn("/proc/net/dev", "r");

	if (fp == NULL) {
		return;
	}
	/* skip headers */
	fgets(buf, sizeof(buf), fp);
	fgets(buf, sizeof(buf), fp);

	while (fgets(buf, sizeof(buf), fp) != NULL) {
		char *ptr;

		/*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");
			return;
		}
		if (sscanf(ptr, "%lu%lu%lu%lu%lu%lu%lu%*d%lu%lu%lu%lu%lu%lu%lu",
			   &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 = do_ioctl_get_iftype(name);
		if (type == -1) {
			bb_error_msg("can't get type of [%s]", name);
			continue;
		}
		if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
			continue;
		memset(&p1, 0, sizeof(p1));
		if (do_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);
		bb_putchar('\n');
	}
}

/* Return value becomes exitcode. It's okay to not return at all */
static int do_show(char **argv)
{
	int err;
	struct ip_tunnel_parm p;

	parse_args(argv, SIOCGETTUNNEL, &p);

	switch (p.iph.protocol) {
	case IPPROTO_IPIP:
		err = do_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
		break;
	case IPPROTO_GRE:
		err = do_get_ioctl(p.name[0] ? p.name : "gre0", &p);
		break;
	case IPPROTO_IPV6:
		err = do_get_ioctl(p.name[0] ? p.name : "sit0", &p);
		break;
	default:
		do_tunnels_list(&p);
		return 0;
	}
	if (err)
		return -1;

	print_tunnel(&p);
	bb_putchar('\n');
	return 0;
}

/* Return value becomes exitcode. It's okay to not return at all */
int do_iptunnel(char **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) {
		smalluint key = index_in_substrings(keywords, *argv);
		if (key > 5)
			bb_error_msg_and_die(bb_msg_invalid_arg, *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);
}
1	niro	532	/* vi: set sw=4 ts=4: */
2			/*
3			* iptunnel.c "ip tunnel"
4			*
5			* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
6			*
7			* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
8			*
9			* Changes:
10			*
11			* Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
12			* Rani Assaf <rani@magic.metawire.com> 980930: do not allow key for ipip/sit
13			* Phil Karn <karn@ka9q.ampr.org> 990408: "pmtudisc" flag
14			*/
15
16			#include <netinet/ip.h>
17			#include <net/if.h>
18			#include <net/if_arp.h>
19	niro	816	#include <asm/types.h>
20	niro	532
21			#ifndef __constant_htons
22			#define __constant_htons htons
23			#endif
24
25	niro	816	// FYI: #define SIOCDEVPRIVATE 0x89F0
26
27			/* From linux/if_tunnel.h. #including it proved troublesome
28			* (redefiniton errors due to name collisions in linux/ and net[inet]/) */
29			#define SIOCGETTUNNEL (SIOCDEVPRIVATE + 0)
30			#define SIOCADDTUNNEL (SIOCDEVPRIVATE + 1)
31			#define SIOCDELTUNNEL (SIOCDEVPRIVATE + 2)
32			#define SIOCCHGTUNNEL (SIOCDEVPRIVATE + 3)
33			//#define SIOCGETPRL (SIOCDEVPRIVATE + 4)
34			//#define SIOCADDPRL (SIOCDEVPRIVATE + 5)
35			//#define SIOCDELPRL (SIOCDEVPRIVATE + 6)
36			//#define SIOCCHGPRL (SIOCDEVPRIVATE + 7)
37			#define GRE_CSUM __constant_htons(0x8000)
38			//#define GRE_ROUTING __constant_htons(0x4000)
39			#define GRE_KEY __constant_htons(0x2000)
40			#define GRE_SEQ __constant_htons(0x1000)
41			//#define GRE_STRICT __constant_htons(0x0800)
42			//#define GRE_REC __constant_htons(0x0700)
43			//#define GRE_FLAGS __constant_htons(0x00F8)
44			//#define GRE_VERSION __constant_htons(0x0007)
45			struct ip_tunnel_parm {
46			char name[IFNAMSIZ];
47			int link;
48			uint16_t i_flags;
49			uint16_t o_flags;
50			uint32_t i_key;
51			uint32_t o_key;
52			struct iphdr iph;
53			};
54			/* SIT-mode i_flags */
55			//#define SIT_ISATAP 0x0001
56			//struct ip_tunnel_prl {
57			// uint32_t addr;
58			// uint16_t flags;
59			// uint16_t __reserved;
60			// uint32_t datalen;
61			// uint32_t __reserved2;
62			// /* data follows */
63			//};
64			///* PRL flags */
65			//#define PRL_DEFAULT 0x0001
66
67			#include "ip_common.h" /* #include "libbb.h" is inside */
68	niro	532	#include "rt_names.h"
69			#include "utils.h"
70
71
72	niro	816	/* Dies on error */
73	niro	532	static int do_ioctl_get_ifindex(char *dev)
74			{
75			struct ifreq ifr;
76			int fd;
77
78	niro	984	strncpy_IFNAMSIZ(ifr.ifr_name, dev);
79	niro	532	fd = xsocket(AF_INET, SOCK_DGRAM, 0);
80	niro	816	xioctl(fd, SIOCGIFINDEX, &ifr);
81	niro	532	close(fd);
82			return ifr.ifr_ifindex;
83			}
84
85			static int do_ioctl_get_iftype(char *dev)
86			{
87			struct ifreq ifr;
88			int fd;
89	niro	816	int err;
90	niro	532
91	niro	984	strncpy_IFNAMSIZ(ifr.ifr_name, dev);
92	niro	532	fd = xsocket(AF_INET, SOCK_DGRAM, 0);
93	niro	816	err = ioctl_or_warn(fd, SIOCGIFHWADDR, &ifr);
94	niro	532	close(fd);
95	niro	816	return err ? -1 : ifr.ifr_addr.sa_family;
96	niro	532	}
97
98			static char *do_ioctl_get_ifname(int idx)
99			{
100	niro	816	struct ifreq ifr;
101	niro	532	int fd;
102	niro	816	int err;
103	niro	532
104			ifr.ifr_ifindex = idx;
105			fd = xsocket(AF_INET, SOCK_DGRAM, 0);
106	niro	816	err = ioctl_or_warn(fd, SIOCGIFNAME, &ifr);
107	niro	532	close(fd);
108	niro	816	return err ? NULL : xstrndup(ifr.ifr_name, sizeof(ifr.ifr_name));
109	niro	532	}
110
111	niro	816	static int do_get_ioctl(const char basedev, struct ip_tunnel_parm p)
112	niro	532	{
113			struct ifreq ifr;
114			int fd;
115			int err;
116
117	niro	984	strncpy_IFNAMSIZ(ifr.ifr_name, basedev);
118	niro	532	ifr.ifr_ifru.ifru_data = (void*)p;
119			fd = xsocket(AF_INET, SOCK_DGRAM, 0);
120	niro	816	err = ioctl_or_warn(fd, SIOCGETTUNNEL, &ifr);
121	niro	532	close(fd);
122			return err;
123			}
124
125	niro	816	/* Dies on error, otherwise returns 0 */
126			static int do_add_ioctl(int cmd, const char basedev, struct ip_tunnel_parm p)
127	niro	532	{
128			struct ifreq ifr;
129			int fd;
130
131			if (cmd == SIOCCHGTUNNEL && p->name[0]) {
132	niro	984	strncpy_IFNAMSIZ(ifr.ifr_name, p->name);
133	niro	532	} else {
134	niro	984	strncpy_IFNAMSIZ(ifr.ifr_name, basedev);
135	niro	532	}
136			ifr.ifr_ifru.ifru_data = (void*)p;
137			fd = xsocket(AF_INET, SOCK_DGRAM, 0);
138	niro	816	#if ENABLE_IOCTL_HEX2STR_ERROR
139			/* #define magic will turn ioctl# into string */
140			if (cmd == SIOCCHGTUNNEL)
141			xioctl(fd, SIOCCHGTUNNEL, &ifr);
142			else
143			xioctl(fd, SIOCADDTUNNEL, &ifr);
144			#else
145			xioctl(fd, cmd, &ifr);
146			#endif
147	niro	532	close(fd);
148	niro	816	return 0;
149	niro	532	}
150
151	niro	816	/* Dies on error, otherwise returns 0 */
152			static int do_del_ioctl(const char basedev, struct ip_tunnel_parm p)
153	niro	532	{
154			struct ifreq ifr;
155			int fd;
156
157			if (p->name[0]) {
158	niro	984	strncpy_IFNAMSIZ(ifr.ifr_name, p->name);
159	niro	532	} else {
160	niro	984	strncpy_IFNAMSIZ(ifr.ifr_name, basedev);
161	niro	532	}
162			ifr.ifr_ifru.ifru_data = (void*)p;
163			fd = xsocket(AF_INET, SOCK_DGRAM, 0);
164	niro	816	xioctl(fd, SIOCDELTUNNEL, &ifr);
165	niro	532	close(fd);
166	niro	816	return 0;
167	niro	532	}
168
169	niro	816	/* Dies on error */
170			static void parse_args(char *argv, int cmd, struct ip_tunnel_parm p)
171	niro	532	{
172	niro	816	static const char keywords[] ALIGN1 =
173			"mode\0""ipip\0""ip/ip\0""gre\0""gre/ip\0""sit\0""ipv6/ip\0"
174			"key\0""ikey\0""okey\0""seq\0""iseq\0""oseq\0"
175			"csum\0""icsum\0""ocsum\0""nopmtudisc\0""pmtudisc\0"
176			"remote\0""any\0""local\0""dev\0"
177			"ttl\0""inherit\0""tos\0""dsfield\0"
178			"name\0";
179			enum {
180			ARG_mode, ARG_ipip, ARG_ip_ip, ARG_gre, ARG_gre_ip, ARG_sit, ARG_ip6_ip,
181			ARG_key, ARG_ikey, ARG_okey, ARG_seq, ARG_iseq, ARG_oseq,
182			ARG_csum, ARG_icsum, ARG_ocsum, ARG_nopmtudisc, ARG_pmtudisc,
183			ARG_remote, ARG_any, ARG_local, ARG_dev,
184			ARG_ttl, ARG_inherit, ARG_tos, ARG_dsfield,
185			ARG_name
186			};
187	niro	532	int count = 0;
188			char medium[IFNAMSIZ];
189	niro	816	int key;
190
191	niro	532	memset(p, 0, sizeof(*p));
192	niro	984	medium[0] = '\0';
193	niro	532
194			p->iph.version = 4;
195			p->iph.ihl = 5;
196			#ifndef IP_DF
197	niro	816	#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
198	niro	532	#endif
199			p->iph.frag_off = htons(IP_DF);
200
201	niro	816	while (*argv) {
202			key = index_in_strings(keywords, *argv);
203			if (key == ARG_mode) {
204	niro	532	NEXT_ARG();
205	niro	816	key = index_in_strings(keywords, *argv);
206			if (key == ARG_ipip \|\|
207	niro	1123	key == ARG_ip_ip
208			) {
209	niro	532	if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
210	niro	816	bb_error_msg_and_die("%s tunnel mode", "you managed to ask for more than one");
211	niro	532	}
212			p->iph.protocol = IPPROTO_IPIP;
213	niro	816	} else if (key == ARG_gre \|\|
214	niro	1123	key == ARG_gre_ip
215			) {
216	niro	532	if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) {
217	niro	816	bb_error_msg_and_die("%s tunnel mode", "you managed to ask for more than one");
218	niro	532	}
219			p->iph.protocol = IPPROTO_GRE;
220	niro	816	} else if (key == ARG_sit \|\|
221	niro	1123	key == ARG_ip6_ip
222			) {
223	niro	532	if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
224	niro	816	bb_error_msg_and_die("%s tunnel mode", "you managed to ask for more than one");
225	niro	532	}
226			p->iph.protocol = IPPROTO_IPV6;
227			} else {
228	niro	984	bb_error_msg_and_die("%s tunnel mode", "can't guess");
229	niro	532	}
230	niro	816	} else if (key == ARG_key) {
231	niro	532	unsigned uval;
232			NEXT_ARG();
233			p->i_flags \|= GRE_KEY;
234			p->o_flags \|= GRE_KEY;
235			if (strchr(*argv, '.'))
236			p->i_key = p->o_key = get_addr32(*argv);
237			else {
238	niro	984	uval = get_unsigned(*argv, "key");
239	niro	532	p->i_key = p->o_key = htonl(uval);
240			}
241	niro	816	} else if (key == ARG_ikey) {
242	niro	532	unsigned uval;
243			NEXT_ARG();
244			p->i_flags \|= GRE_KEY;
245			if (strchr(*argv, '.'))
246			p->o_key = get_addr32(*argv);
247			else {
248	niro	984	uval = get_unsigned(*argv, "ikey");
249	niro	532	p->i_key = htonl(uval);
250			}
251	niro	816	} else if (key == ARG_okey) {
252	niro	532	unsigned uval;
253			NEXT_ARG();
254			p->o_flags \|= GRE_KEY;
255			if (strchr(*argv, '.'))
256			p->o_key = get_addr32(*argv);
257			else {
258	niro	984	uval = get_unsigned(*argv, "okey");
259	niro	532	p->o_key = htonl(uval);
260			}
261	niro	816	} else if (key == ARG_seq) {
262	niro	532	p->i_flags \|= GRE_SEQ;
263			p->o_flags \|= GRE_SEQ;
264	niro	816	} else if (key == ARG_iseq) {
265	niro	532	p->i_flags \|= GRE_SEQ;
266	niro	816	} else if (key == ARG_oseq) {
267	niro	532	p->o_flags \|= GRE_SEQ;
268	niro	816	} else if (key == ARG_csum) {
269	niro	532	p->i_flags \|= GRE_CSUM;
270			p->o_flags \|= GRE_CSUM;
271	niro	816	} else if (key == ARG_icsum) {
272	niro	532	p->i_flags \|= GRE_CSUM;
273	niro	816	} else if (key == ARG_ocsum) {
274	niro	532	p->o_flags \|= GRE_CSUM;
275	niro	816	} else if (key == ARG_nopmtudisc) {
276	niro	532	p->iph.frag_off = 0;
277	niro	816	} else if (key == ARG_pmtudisc) {
278	niro	532	p->iph.frag_off = htons(IP_DF);
279	niro	816	} else if (key == ARG_remote) {
280	niro	532	NEXT_ARG();
281	niro	816	key = index_in_strings(keywords, *argv);
282			if (key != ARG_any)
283	niro	532	p->iph.daddr = get_addr32(*argv);
284	niro	816	} else if (key == ARG_local) {
285	niro	532	NEXT_ARG();
286	niro	816	key = index_in_strings(keywords, *argv);
287			if (key != ARG_any)
288	niro	532	p->iph.saddr = get_addr32(*argv);
289	niro	816	} else if (key == ARG_dev) {
290	niro	532	NEXT_ARG();
291	niro	984	strncpy_IFNAMSIZ(medium, *argv);
292	niro	816	} else if (key == ARG_ttl) {
293	niro	532	unsigned uval;
294			NEXT_ARG();
295	niro	816	key = index_in_strings(keywords, *argv);
296			if (key != ARG_inherit) {
297	niro	984	uval = get_unsigned(*argv, "TTL");
298	niro	532	if (uval > 255)
299			invarg(*argv, "TTL must be <=255");
300			p->iph.ttl = uval;
301			}
302	niro	816	} else if (key == ARG_tos \|\|
303	niro	1123	key == ARG_dsfield
304			) {
305	niro	532	uint32_t uval;
306			NEXT_ARG();
307	niro	816	key = index_in_strings(keywords, *argv);
308			if (key != ARG_inherit) {
309	niro	532	if (rtnl_dsfield_a2n(&uval, *argv))
310			invarg(*argv, "TOS");
311			p->iph.tos = uval;
312			} else
313			p->iph.tos = 1;
314			} else {
315	niro	816	if (key == ARG_name) {
316	niro	532	NEXT_ARG();
317			}
318			if (p->name[0])
319			duparg2("name", *argv);
320	niro	984	strncpy_IFNAMSIZ(p->name, *argv);
321	niro	532	if (cmd == SIOCCHGTUNNEL && count == 0) {
322			struct ip_tunnel_parm old_p;
323			memset(&old_p, 0, sizeof(old_p));
324			if (do_get_ioctl(*argv, &old_p))
325	niro	816	exit(EXIT_FAILURE);
326	niro	532	*p = old_p;
327			}
328			}
329			count++;
330	niro	816	argv++;
331	niro	532	}
332
333			if (p->iph.protocol == 0) {
334			if (memcmp(p->name, "gre", 3) == 0)
335			p->iph.protocol = IPPROTO_GRE;
336			else if (memcmp(p->name, "ipip", 4) == 0)
337			p->iph.protocol = IPPROTO_IPIP;
338			else if (memcmp(p->name, "sit", 3) == 0)
339			p->iph.protocol = IPPROTO_IPV6;
340			}
341
342			if (p->iph.protocol == IPPROTO_IPIP \|\| p->iph.protocol == IPPROTO_IPV6) {
343			if ((p->i_flags & GRE_KEY) \|\| (p->o_flags & GRE_KEY)) {
344	niro	816	bb_error_msg_and_die("keys are not allowed with ipip and sit");
345	niro	532	}
346			}
347
348			if (medium[0]) {
349			p->link = do_ioctl_get_ifindex(medium);
350			}
351
352			if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
353			p->i_key = p->iph.daddr;
354			p->i_flags \|= GRE_KEY;
355			}
356			if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
357			p->o_key = p->iph.daddr;
358			p->o_flags \|= GRE_KEY;
359			}
360			if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
361	niro	816	bb_error_msg_and_die("broadcast tunnel requires a source address");
362	niro	532	}
363			}
364
365	niro	816	/* Return value becomes exitcode. It's okay to not return at all */
366			static int do_add(int cmd, char **argv)
367	niro	532	{
368			struct ip_tunnel_parm p;
369
370	niro	816	parse_args(argv, cmd, &p);
371	niro	532
372			if (p.iph.ttl && p.iph.frag_off == 0) {
373	niro	816	bb_error_msg_and_die("ttl != 0 and noptmudisc are incompatible");
374	niro	532	}
375
376			switch (p.iph.protocol) {
377			case IPPROTO_IPIP:
378			return do_add_ioctl(cmd, "tunl0", &p);
379			case IPPROTO_GRE:
380			return do_add_ioctl(cmd, "gre0", &p);
381			case IPPROTO_IPV6:
382			return do_add_ioctl(cmd, "sit0", &p);
383			default:
384	niro	984	bb_error_msg_and_die("can't determine tunnel mode (ipip, gre or sit)");
385	niro	532	}
386			}
387
388	niro	816	/* Return value becomes exitcode. It's okay to not return at all */
389			static int do_del(char **argv)
390	niro	532	{
391			struct ip_tunnel_parm p;
392
393	niro	816	parse_args(argv, SIOCDELTUNNEL, &p);
394	niro	532
395			switch (p.iph.protocol) {
396			case IPPROTO_IPIP:
397			return do_del_ioctl("tunl0", &p);
398			case IPPROTO_GRE:
399			return do_del_ioctl("gre0", &p);
400			case IPPROTO_IPV6:
401			return do_del_ioctl("sit0", &p);
402			default:
403			return do_del_ioctl(p.name, &p);
404			}
405			}
406
407			static void print_tunnel(struct ip_tunnel_parm *p)
408			{
409			char s1[256];
410			char s2[256];
411			char s3[64];
412			char s4[64];
413
414			format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1));
415			format_host(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2));
416			inet_ntop(AF_INET, &p->i_key, s3, sizeof(s3));
417			inet_ntop(AF_INET, &p->o_key, s4, sizeof(s4));
418
419			printf("%s: %s/ip remote %s local %s ",
420			p->name,
421			p->iph.protocol == IPPROTO_IPIP ? "ip" :
422			(p->iph.protocol == IPPROTO_GRE ? "gre" :
423			(p->iph.protocol == IPPROTO_IPV6 ? "ipv6" : "unknown")),
424			p->iph.daddr ? s1 : "any", p->iph.saddr ? s2 : "any");
425			if (p->link) {
426			char *n = do_ioctl_get_ifname(p->link);
427	niro	816	if (n) {
428	niro	532	printf(" dev %s ", n);
429	niro	816	free(n);
430			}
431	niro	532	}
432			if (p->iph.ttl)
433			printf(" ttl %d ", p->iph.ttl);
434			else
435			printf(" ttl inherit ");
436			if (p->iph.tos) {
437			SPRINT_BUF(b1);
438			printf(" tos");
439			if (p->iph.tos & 1)
440			printf(" inherit");
441			if (p->iph.tos & ~1)
442			printf("%c%s ", p->iph.tos & 1 ? '/' : ' ',
443	niro	984	rtnl_dsfield_n2a(p->iph.tos & ~1, b1));
444	niro	532	}
445			if (!(p->iph.frag_off & htons(IP_DF)))
446			printf(" nopmtudisc");
447
448			if ((p->i_flags & GRE_KEY) && (p->o_flags & GRE_KEY) && p->o_key == p->i_key)
449			printf(" key %s", s3);
450			else if ((p->i_flags \| p->o_flags) & GRE_KEY) {
451			if (p->i_flags & GRE_KEY)
452			printf(" ikey %s ", s3);
453			if (p->o_flags & GRE_KEY)
454			printf(" okey %s ", s4);
455			}
456
457			if (p->i_flags & GRE_SEQ)
458	niro	816	printf("%c Drop packets out of sequence.\n", _SL_);
459	niro	532	if (p->i_flags & GRE_CSUM)
460	niro	816	printf("%c Checksum in received packet is required.", _SL_);
461	niro	532	if (p->o_flags & GRE_SEQ)
462	niro	816	printf("%c Sequence packets on output.", _SL_);
463	niro	532	if (p->o_flags & GRE_CSUM)
464	niro	816	printf("%c Checksum output packets.", _SL_);
465	niro	532	}
466
467	niro	816	static void do_tunnels_list(struct ip_tunnel_parm *p)
468	niro	532	{
469			char name[IFNAMSIZ];
470			unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
471			rx_fifo, rx_frame,
472			tx_bytes, tx_packets, tx_errs, tx_drops,
473			tx_fifo, tx_colls, tx_carrier, rx_multi;
474			int type;
475			struct ip_tunnel_parm p1;
476			char buf[512];
477	niro	816	FILE *fp = fopen_or_warn("/proc/net/dev", "r");
478	niro	532
479			if (fp == NULL) {
480	niro	816	return;
481	niro	532	}
482	niro	816	/* skip headers */
483	niro	532	fgets(buf, sizeof(buf), fp);
484			fgets(buf, sizeof(buf), fp);
485
486			while (fgets(buf, sizeof(buf), fp) != NULL) {
487			char *ptr;
488
489			/buf[sizeof(buf) - 1] = 0; - fgets is safe anyway /
490			ptr = strchr(buf, ':');
491			if (ptr == NULL \|\|
492	niro	1123	(*ptr++ = 0, sscanf(buf, "%s", name) != 1)
493			) {
494	niro	816	bb_error_msg("wrong format of /proc/net/dev");
495			return;
496	niro	532	}
497			if (sscanf(ptr, "%lu%lu%lu%lu%lu%lu%lu%*d%lu%lu%lu%lu%lu%lu%lu",
498			&rx_bytes, &rx_packets, &rx_errs, &rx_drops,
499			&rx_fifo, &rx_frame, &rx_multi,
500			&tx_bytes, &tx_packets, &tx_errs, &tx_drops,
501			&tx_fifo, &tx_colls, &tx_carrier) != 14)
502			continue;
503			if (p->name[0] && strcmp(p->name, name))
504			continue;
505			type = do_ioctl_get_iftype(name);
506			if (type == -1) {
507	niro	984	bb_error_msg("can't get type of [%s]", name);
508	niro	532	continue;
509			}
510			if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
511			continue;
512			memset(&p1, 0, sizeof(p1));
513			if (do_get_ioctl(name, &p1))
514			continue;
515			if ((p->link && p1.link != p->link) \|\|
516			(p->name[0] && strcmp(p1.name, p->name)) \|\|
517			(p->iph.daddr && p1.iph.daddr != p->iph.daddr) \|\|
518			(p->iph.saddr && p1.iph.saddr != p->iph.saddr) \|\|
519	niro	1123	(p->i_key && p1.i_key != p->i_key)
520			) {
521	niro	532	continue;
522	niro	1123	}
523	niro	532	print_tunnel(&p1);
524	niro	816	bb_putchar('\n');
525	niro	532	}
526			}
527
528	niro	816	/* Return value becomes exitcode. It's okay to not return at all */
529			static int do_show(char **argv)
530	niro	532	{
531			int err;
532			struct ip_tunnel_parm p;
533
534	niro	816	parse_args(argv, SIOCGETTUNNEL, &p);
535	niro	532
536			switch (p.iph.protocol) {
537			case IPPROTO_IPIP:
538			err = do_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
539			break;
540			case IPPROTO_GRE:
541			err = do_get_ioctl(p.name[0] ? p.name : "gre0", &p);
542			break;
543			case IPPROTO_IPV6:
544			err = do_get_ioctl(p.name[0] ? p.name : "sit0", &p);
545			break;
546			default:
547			do_tunnels_list(&p);
548			return 0;
549			}
550			if (err)
551			return -1;
552
553			print_tunnel(&p);
554	niro	816	bb_putchar('\n');
555	niro	532	return 0;
556			}
557
558	niro	816	/* Return value becomes exitcode. It's okay to not return at all */
559			int do_iptunnel(char **argv)
560	niro	532	{
561	niro	816	static const char keywords[] ALIGN1 =
562			"add\0""change\0""delete\0""show\0""list\0""lst\0";
563			enum { ARG_add = 0, ARG_change, ARG_del, ARG_show, ARG_list, ARG_lst };
564	niro	532
565	niro	816	if (*argv) {
566	niro	1123	smalluint key = index_in_substrings(keywords, *argv);
567			if (key > 5)
568	niro	816	bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
569			argv++;
570			if (key == ARG_add)
571			return do_add(SIOCADDTUNNEL, argv);
572			if (key == ARG_change)
573			return do_add(SIOCCHGTUNNEL, argv);
574			if (key == ARG_del)
575			return do_del(argv);
576			}
577			return do_show(argv);
578	niro	532	}