| /* |
| * 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" |
| " [ mode { ipip | gre | sit | isatap | vti } ] [ 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) { |
| struct ip_tunnel_parm 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->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); |
| } |