aboutsummaryrefslogtreecommitdiff
path: root/networking/libiproute/iptunnel.c
diff options
context:
space:
mode:
Diffstat (limited to 'networking/libiproute/iptunnel.c')
-rw-r--r--networking/libiproute/iptunnel.c548
1 files changed, 548 insertions, 0 deletions
diff --git a/networking/libiproute/iptunnel.c b/networking/libiproute/iptunnel.c
new file mode 100644
index 000000000..beb8bb675
--- /dev/null
+++ b/networking/libiproute/iptunnel.c
@@ -0,0 +1,548 @@
+/*
+ * 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>
+ *
+ *
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <arpa/inet.h>
+
+#include <linux/if.h>
+#include <linux/if_arp.h>
+#include <linux/if_tunnel.h>
+
+#include "rt_names.h"
+#include "utils.h"
+
+#include "busybox.h"
+
+static int do_ioctl_get_ifindex(char *dev)
+{
+ struct ifreq ifr;
+ int fd;
+ int err;
+
+ strcpy(ifr.ifr_name, dev);
+ fd = socket(AF_INET, SOCK_DGRAM, 0);
+ err = ioctl(fd, SIOCGIFINDEX, &ifr);
+ if (err) {
+ perror("ioctl");
+ return 0;
+ }
+ close(fd);
+ return ifr.ifr_ifindex;
+}
+
+static int do_ioctl_get_iftype(char *dev)
+{
+ struct ifreq ifr;
+ int fd;
+ int err;
+
+ strcpy(ifr.ifr_name, dev);
+ fd = socket(AF_INET, SOCK_DGRAM, 0);
+ err = ioctl(fd, SIOCGIFHWADDR, &ifr);
+ if (err) {
+ perror("ioctl");
+ return -1;
+ }
+ close(fd);
+ return ifr.ifr_addr.sa_family;
+}
+
+
+static char * do_ioctl_get_ifname(int idx)
+{
+ static struct ifreq ifr;
+ int fd;
+ int err;
+
+ ifr.ifr_ifindex = idx;
+ fd = socket(AF_INET, 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 ip_tunnel_parm *p)
+{
+ struct ifreq ifr;
+ int fd;
+ int err;
+
+ strcpy(ifr.ifr_name, basedev);
+ ifr.ifr_ifru.ifru_data = (void*)p;
+ fd = socket(AF_INET, 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 ip_tunnel_parm *p)
+{
+ struct ifreq ifr;
+ int fd;
+ int err;
+
+ if (cmd == SIOCCHGTUNNEL && p->name[0])
+ strcpy(ifr.ifr_name, p->name);
+ else
+ strcpy(ifr.ifr_name, basedev);
+ ifr.ifr_ifru.ifru_data = (void*)p;
+ fd = socket(AF_INET, SOCK_DGRAM, 0);
+ err = ioctl(fd, cmd, &ifr);
+ if (err)
+ perror("ioctl");
+ close(fd);
+ return err;
+}
+
+static int do_del_ioctl(char *basedev, struct ip_tunnel_parm *p)
+{
+ struct ifreq ifr;
+ int fd;
+ int err;
+
+ if (p->name[0])
+ strcpy(ifr.ifr_name, p->name);
+ else
+ strcpy(ifr.ifr_name, basedev);
+ ifr.ifr_ifru.ifru_data = (void*)p;
+ fd = socket(AF_INET, SOCK_DGRAM, 0);
+ err = ioctl(fd, SIOCDELTUNNEL, &ifr);
+ if (err)
+ perror("ioctl");
+ close(fd);
+ return err;
+}
+
+static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
+{
+ int count = 0;
+ char medium[IFNAMSIZ];
+
+ 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 {
+ fprintf(stderr,"Cannot guess tunnel mode.\n");
+ 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 of \"key\"\n");
+ 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->o_key = get_addr32(*argv);
+ else {
+ if (get_unsigned(&uval, *argv, 0)<0) {
+ fprintf(stderr, "invalid value of \"ikey\"\n");
+ 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 of \"okey\"\n");
+ 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) {
+ 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 ||
+ matches(*argv, "dsfield") == 0) {
+ __u32 uval;
+ NEXT_ARG();
+ if (strcmp(*argv, "inherit") != 0) {
+ if (rtnl_dsfield_a2n(&uval, *argv))
+ invarg("bad TOS value", *argv);
+ p->iph.tos = uval;
+ } else
+ p->iph.tos = 1;
+ } else {
+ if (strcmp(*argv, "name") == 0) {
+ NEXT_ARG();
+ }
+ 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 (do_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;
+ }
+
+ 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.\n");
+ return -1;
+ }
+ }
+
+ if (medium[0]) {
+ p->link = do_ioctl_get_ifindex(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, "Broadcast tunnel requires a source address.\n");
+ return -1;
+ }
+ 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:
+ 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:
+ fprintf(stderr, "cannot determine tunnel mode (ipip, gre or sit)\n");
+ return -1;
+ }
+ return -1;
+}
+
+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:
+ 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);
+ }
+ return -1;
+}
+
+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);
+ }
+ 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->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("%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;
+ int type;
+ struct ip_tunnel_parm p1;
+
+ char buf[512];
+ FILE *fp = fopen("/proc/net/dev", "r");
+ if (fp == NULL) {
+ perror("fopen");
+ return -1;
+ }
+
+ fgets(buf, sizeof(buf), fp);
+ fgets(buf, sizeof(buf), fp);
+
+ while (fgets(buf, sizeof(buf), fp) != NULL) {
+ 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");
+ 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;
+ type = do_ioctl_get_iftype(name);
+ 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 (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);
+ printf("\n");
+ }
+ return 0;
+}
+
+static int do_show(int argc, char **argv)
+{
+ int err;
+ struct ip_tunnel_parm p;
+
+ if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
+ return -1;
+
+ 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);
+ printf("\n");
+ return 0;
+}
+
+int do_iptunnel(int argc, 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);
+
+ fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\".\n", *argv);
+ exit(-1);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 08:24:20 +0000