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-rw-r--r--ip/iptunnel.c602
1 files changed, 602 insertions, 0 deletions
diff --git a/ip/iptunnel.c b/ip/iptunnel.c
new file mode 100644
index 0000000..b6da145
--- /dev/null
+++ b/ip/iptunnel.c
@@ -0,0 +1,602 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * iptunnel.c "ip tunnel"
+ *
+ * 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 <linux/ip6_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"
+ " [ mode { gre | ipip | isatap | sit | vti } ]\n"
+ " [ remote ADDR ] [ local ADDR ]\n"
+ " [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n"
+ " [ prl-default ADDR ] [ prl-nodefault ADDR ] [ prl-delete ADDR ]\n"
+ " [ 6rd-prefix ADDR ] [ 6rd-relay_prefix ADDR ] [ 6rd-reset ]\n"
+ " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n"
+ "\n"
+ "Where: NAME := STRING\n"
+ " ADDR := { IP_ADDRESS | any }\n"
+ " TOS := { STRING | 00..ff | inherit | inherit/STRING | inherit/00..ff }\n"
+ " TTL := { 1..255 | inherit }\n"
+ " KEY := { DOTTED_QUAD | NUMBER }\n");
+ exit(-1);
+}
+
+static void set_tunnel_proto(struct ip_tunnel_parm *p, int proto)
+{
+ if (p->iph.protocol && p->iph.protocol != proto) {
+ fprintf(stderr,
+ "You managed to ask for more than one tunnel mode.\n");
+ exit(-1);
+ }
+ p->iph.protocol = proto;
+}
+
+static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
+{
+ int count = 0;
+ const char *medium = NULL;
+ int isatap = 0;
+
+ memset(p, 0, sizeof(*p));
+ 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) {
+ set_tunnel_proto(p, IPPROTO_IPIP);
+ } else if (strcmp(*argv, "gre") == 0 ||
+ strcmp(*argv, "gre/ip") == 0) {
+ set_tunnel_proto(p, IPPROTO_GRE);
+ } else if (strcmp(*argv, "sit") == 0 ||
+ strcmp(*argv, "ipv6/ip") == 0) {
+ set_tunnel_proto(p, IPPROTO_IPV6);
+ } else if (strcmp(*argv, "isatap") == 0) {
+ set_tunnel_proto(p, IPPROTO_IPV6);
+ isatap++;
+ } else if (strcmp(*argv, "vti") == 0) {
+ set_tunnel_proto(p, IPPROTO_IPIP);
+ p->i_flags |= VTI_ISVTI;
+ } else {
+ fprintf(stderr,
+ "Unknown tunnel mode \"%s\"\n", *argv);
+ exit(-1);
+ }
+ } else if (strcmp(*argv, "key") == 0) {
+ NEXT_ARG();
+ p->i_flags |= GRE_KEY;
+ p->o_flags |= GRE_KEY;
+ p->i_key = p->o_key = tnl_parse_key("key", *argv);
+ } else if (strcmp(*argv, "ikey") == 0) {
+ NEXT_ARG();
+ p->i_flags |= GRE_KEY;
+ p->i_key = tnl_parse_key("ikey", *argv);
+ } else if (strcmp(*argv, "okey") == 0) {
+ NEXT_ARG();
+ p->o_flags |= GRE_KEY;
+ p->o_key = tnl_parse_key("okey", *argv);
+ } 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();
+ p->iph.daddr = get_addr32(*argv);
+ } else if (strcmp(*argv, "local") == 0) {
+ NEXT_ARG();
+ p->iph.saddr = get_addr32(*argv);
+ } else if (strcmp(*argv, "dev") == 0) {
+ NEXT_ARG();
+ medium = *argv;
+ } else if (strcmp(*argv, "ttl") == 0 ||
+ strcmp(*argv, "hoplimit") == 0 ||
+ strcmp(*argv, "hlim") == 0) {
+ __u8 uval;
+
+ NEXT_ARG();
+ if (strcmp(*argv, "inherit") != 0) {
+ if (get_u8(&uval, *argv, 0))
+ invarg("invalid TTL\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);
+ if (get_ifname(p->name, *argv))
+ invarg("\"name\" not a valid ifname", *argv);
+ if (cmd == SIOCCHGTUNNEL && count == 0) {
+ union {
+ struct ip_tunnel_parm ip_tnl;
+ struct ip6_tnl_parm2 ip6_tnl;
+ } old_p = {};
+
+ if (tnl_get_ioctl(*argv, &old_p))
+ return -1;
+
+ if (old_p.ip_tnl.iph.version != 4 ||
+ old_p.ip_tnl.iph.ihl != 5)
+ invarg("\"name\" is not an ip tunnel",
+ *argv);
+
+ *p = old_p.ip_tnl;
+ }
+ }
+ 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->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
+ if (!(p->i_flags & VTI_ISVTI) &&
+ (p->iph.protocol != IPPROTO_GRE)) {
+ fprintf(stderr, "Keys are not allowed with ipip and sit tunnels\n");
+ return -1;
+ }
+ }
+
+ if (medium) {
+ p->link = ll_name_to_index(medium);
+ if (!p->link)
+ return nodev(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) {
+ fprintf(stderr, "A broadcast tunnel requires a source address\n");
+ return -1;
+ }
+ if (isatap)
+ p->i_flags |= SIT_ISATAP;
+
+ return 0;
+}
+
+static const char *tnl_defname(const struct ip_tunnel_parm *p)
+{
+ switch (p->iph.protocol) {
+ case IPPROTO_IPIP:
+ if (p->i_flags & VTI_ISVTI)
+ return "ip_vti0";
+ else
+ return "tunl0";
+ case IPPROTO_GRE:
+ return "gre0";
+ case IPPROTO_IPV6:
+ return "sit0";
+ }
+ return NULL;
+}
+
+static int do_add(int cmd, int argc, char **argv)
+{
+ struct ip_tunnel_parm p;
+ const char *basedev;
+
+ if (parse_args(argc, argv, cmd, &p) < 0)
+ return -1;
+
+ if (p.iph.ttl && p.iph.frag_off == 0) {
+ fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n");
+ return -1;
+ }
+
+ basedev = tnl_defname(&p);
+ if (!basedev) {
+ fprintf(stderr,
+ "cannot determine tunnel mode (ipip, gre, vti or sit)\n");
+ return -1;
+ }
+
+ return tnl_add_ioctl(cmd, basedev, p.name, &p);
+}
+
+static int do_del(int argc, char **argv)
+{
+ struct ip_tunnel_parm p;
+
+ if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
+ return -1;
+
+ return tnl_del_ioctl(tnl_defname(&p) ? : p.name, p.name, &p);
+}
+
+static void print_tunnel(const void *t)
+{
+ const struct ip_tunnel_parm *p = t;
+ struct ip_tunnel_6rd ip6rd = {};
+ SPRINT_BUF(b1);
+
+ /* Do not use format_host() for local addr,
+ * symbolic name will not be useful.
+ */
+ open_json_object(NULL);
+ print_color_string(PRINT_ANY, COLOR_IFNAME, "ifname", "%s: ", p->name);
+ snprintf(b1, sizeof(b1), "%s/ip", tnl_strproto(p->iph.protocol));
+ print_string(PRINT_ANY, "mode", "%s ", b1);
+ print_null(PRINT_FP, NULL, "remote ", NULL);
+ print_color_string(PRINT_ANY, COLOR_INET, "remote", "%s ",
+ p->iph.daddr || is_json_context()
+ ? format_host_r(AF_INET, 4, &p->iph.daddr, b1, sizeof(b1))
+ : "any");
+ print_null(PRINT_FP, NULL, "local ", NULL);
+ print_color_string(PRINT_ANY, COLOR_INET, "local", "%s",
+ p->iph.saddr || is_json_context()
+ ? rt_addr_n2a_r(AF_INET, 4, &p->iph.saddr, b1, sizeof(b1))
+ : "any");
+
+ if (p->iph.protocol == IPPROTO_IPV6 && (p->i_flags & SIT_ISATAP)) {
+ struct ip_tunnel_prl prl[16] = {};
+ int i;
+
+ 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 < ARRAY_SIZE(prl); i++) {
+ if (prl[i].addr == htonl(INADDR_ANY))
+ continue;
+ if (prl[i].flags & PRL_DEFAULT)
+ print_string(PRINT_ANY, "pdr",
+ " pdr %s",
+ format_host(AF_INET, 4, &prl[i].addr));
+ else
+ print_string(PRINT_ANY, "pr", " pr %s",
+ format_host(AF_INET, 4, &prl[i].addr));
+ }
+ }
+ }
+
+ if (p->link) {
+ const char *n = ll_index_to_name(p->link);
+
+ if (n)
+ print_string(PRINT_ANY, "dev", " dev %s", n);
+ }
+
+ if (p->iph.ttl)
+ print_uint(PRINT_ANY, "ttl", " ttl %u", p->iph.ttl);
+ else
+ print_string(PRINT_FP, "ttl", " ttl %s", "inherit");
+
+ if (p->iph.tos) {
+ SPRINT_BUF(b2);
+
+ if (p->iph.tos != 1) {
+ if (!is_json_context() && p->iph.tos & 1)
+ snprintf(b2, sizeof(b2), "%s%s",
+ p->iph.tos & 1 ? "inherit/" : "",
+ rtnl_dsfield_n2a(p->iph.tos & ~1, b1, sizeof(b1)));
+ else
+ snprintf(b2, sizeof(b2), "%s",
+ rtnl_dsfield_n2a(p->iph.tos, b1, sizeof(b1)));
+ print_string(PRINT_ANY, "tos", " tos %s", b2);
+ } else {
+ print_string(PRINT_FP, NULL, " tos %s", "inherit");
+ }
+ }
+
+ if (!(p->iph.frag_off & htons(IP_DF)))
+ print_null(PRINT_ANY, "nopmtudisc", " nopmtudisc", NULL);
+
+ if (p->iph.protocol == IPPROTO_IPV6 && !tnl_ioctl_get_6rd(p->name, &ip6rd) && ip6rd.prefixlen) {
+ print_string(PRINT_ANY, "6rd-prefix", " 6rd-prefix %s",
+ inet_ntop(AF_INET6, &ip6rd.prefix, b1, sizeof(b1)));
+ print_uint(PRINT_ANY, "6rd-prefixlen", "/%u", ip6rd.prefixlen);
+ if (ip6rd.relay_prefix) {
+ print_string(PRINT_ANY, "6rd-relay_prefix",
+ " 6rd-relay_prefix %s",
+ format_host(AF_INET, 4, &ip6rd.relay_prefix));
+ print_uint(PRINT_ANY, "6rd-relay_prefixlen", "/%u",
+ ip6rd.relay_prefixlen);
+ }
+ }
+
+ tnl_print_gre_flags(p->iph.protocol, p->i_flags, p->o_flags,
+ p->i_key, p->o_key);
+
+ close_json_object();
+}
+
+
+static void ip_tunnel_parm_initialize(const struct tnl_print_nlmsg_info *info)
+{
+ struct ip_tunnel_parm *p2 = info->p2;
+
+ memset(p2, 0, sizeof(*p2));
+}
+
+static bool ip_tunnel_parm_match(const struct tnl_print_nlmsg_info *info)
+{
+ const struct ip_tunnel_parm *p1 = info->p1;
+ const struct ip_tunnel_parm *p2 = info->p2;
+
+ return ((!p1->link || p1->link == p2->link) &&
+ (!p1->name[0] || strcmp(p1->name, p2->name) == 0) &&
+ (!p1->iph.daddr || p1->iph.daddr == p2->iph.daddr) &&
+ (!p1->iph.saddr || p1->iph.saddr == p2->iph.saddr) &&
+ (!p1->i_key || p1->i_key == p2->i_key));
+}
+
+static int do_show(int argc, char **argv)
+{
+ struct ip_tunnel_parm p, p1;
+ const char *basedev;
+
+ if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
+ return -1;
+
+ basedev = tnl_defname(&p);
+ if (!basedev) {
+ struct tnl_print_nlmsg_info info = {
+ .p1 = &p,
+ .p2 = &p1,
+ .init = ip_tunnel_parm_initialize,
+ .match = ip_tunnel_parm_match,
+ .print = print_tunnel,
+ };
+
+ return do_tunnels_list(&info);
+ }
+
+ if (tnl_get_ioctl(p.name[0] ? p.name : basedev, &p))
+ return -1;
+
+ print_tunnel(&p);
+ fputc('\n', stdout);
+ return 0;
+}
+
+static int do_prl(int argc, char **argv)
+{
+ struct ip_tunnel_prl p = {};
+ int count = 0;
+ int cmd = 0;
+ const char *medium = NULL;
+
+ 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();
+ if (check_ifname(*argv))
+ invarg("\"dev\" not a valid ifname", *argv);
+ medium = *argv;
+ } 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 (!medium) {
+ 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 cmd = 0;
+ const char *medium = NULL;
+ inet_prefix prefix;
+
+ 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();
+ if (check_ifname(*argv))
+ invarg("\"dev\" not a valid ifname", *argv);
+ medium = *argv;
+ } else {
+ fprintf(stderr,
+ "Invalid 6RD parameter \"%s\"\n", *argv);
+ exit(-1);
+ }
+ argc--; argv++;
+ }
+ if (!medium) {
+ fprintf(stderr, "Must specify device\n");
+ exit(-1);
+ }
+
+ return tnl_6rd_ioctl(cmd, medium, &ip6rd);
+}
+
+static int tunnel_mode_is_ipv6(char *tunnel_mode)
+{
+ static const char * const ipv6_modes[] = {
+ "ipv6/ipv6", "ip6ip6",
+ "vti6",
+ "ip/ipv6", "ipv4/ipv6", "ipip6", "ip4ip6",
+ "ip6gre", "gre/ipv6",
+ "any/ipv6", "any"
+ };
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ipv6_modes); i++) {
+ if (strcmp(ipv6_modes[i], tunnel_mode) == 0)
+ return 1;
+ }
+ return 0;
+}
+
+int do_iptunnel(int argc, char **argv)
+{
+ int i;
+
+ for (i = 0; i < argc - 1; i++) {
+ if (strcmp(argv[i], "mode") == 0) {
+ if (tunnel_mode_is_ipv6(argv[i + 1]))
+ preferred_family = AF_INET6;
+ break;
+ }
+ }
+ 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);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-29 18:44:52 +0000