| /* |
| * link_iptnl.c ipip and sit driver module |
| * |
| * 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: Nicolas Dichtel <nicolas.dichtel@6wind.com> |
| * |
| */ |
| |
| #include <string.h> |
| #include <net/if.h> |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <arpa/inet.h> |
| |
| #include <linux/in.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 iptunnel_print_help(struct link_util *lu, int argc, char **argv, |
| FILE *f) |
| { |
| const char *mode; |
| |
| if (strcmp(lu->id, "sit") == 0) { |
| mode = "{ ip6ip | ipip | mplsip | any } ]\n" |
| " [ isatap"; |
| } else { |
| mode = "{ ipip | mplsip | any }"; |
| } |
| |
| fprintf(f, |
| "Usage: ... %-6s [ remote ADDR ]\n" |
| " [ local ADDR ]\n" |
| " [ ttl TTL ]\n" |
| " [ tos TOS ]\n" |
| " [ [no]pmtudisc ]\n" |
| " [ 6rd-prefix ADDR ]\n" |
| " [ 6rd-relay_prefix ADDR ]\n" |
| " [ 6rd-reset ]\n" |
| " [ dev PHYS_DEV ]\n" |
| " [ fwmark MARK ]\n" |
| " [ external ]\n" |
| " [ noencap ]\n" |
| " [ encap { fou | gue | none } ]\n" |
| " [ encap-sport PORT ]\n" |
| " [ encap-dport PORT ]\n" |
| " [ [no]encap-csum ]\n" |
| " [ [no]encap-csum6 ]\n" |
| " [ [no]encap-remcsum ]\n" |
| " [ mode %s ]\n" |
| "\n" |
| "Where: ADDR := { IP_ADDRESS | any }\n" |
| " TOS := { NUMBER | inherit }\n" |
| " TTL := { 1..255 | inherit }\n" |
| " MARK := { 0x0..0xffffffff }\n", |
| lu->id, mode); |
| } |
| |
| static int iptunnel_parse_opt(struct link_util *lu, int argc, char **argv, |
| struct nlmsghdr *n) |
| { |
| struct ifinfomsg *ifi = NLMSG_DATA(n); |
| struct { |
| struct nlmsghdr n; |
| struct ifinfomsg i; |
| } req = { |
| .n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)), |
| .n.nlmsg_flags = NLM_F_REQUEST, |
| .n.nlmsg_type = RTM_GETLINK, |
| .i.ifi_family = preferred_family, |
| .i.ifi_index = ifi->ifi_index, |
| }; |
| struct nlmsghdr *answer; |
| struct rtattr *tb[IFLA_MAX + 1]; |
| struct rtattr *linkinfo[IFLA_INFO_MAX+1]; |
| struct rtattr *iptuninfo[IFLA_IPTUN_MAX + 1]; |
| int len; |
| inet_prefix saddr, daddr, ip6rdprefix, ip6rdrelayprefix; |
| __u8 pmtudisc = 1; |
| __u8 tos = 0; |
| __u16 iflags = 0; |
| __u8 ttl = 0; |
| __u8 proto = 0; |
| __u32 link = 0; |
| __u16 encaptype = 0; |
| __u16 encapflags = 0; |
| __u16 encapsport = 0; |
| __u16 encapdport = 0; |
| __u8 metadata = 0; |
| __u32 fwmark = 0; |
| |
| inet_prefix_reset(&saddr); |
| inet_prefix_reset(&daddr); |
| |
| inet_prefix_reset(&ip6rdprefix); |
| inet_prefix_reset(&ip6rdrelayprefix); |
| |
| if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
| const struct rtattr *rta; |
| |
| if (rtnl_talk(&rth, &req.n, &answer) < 0) { |
| get_failed: |
| fprintf(stderr, |
| "Failed to get existing tunnel info.\n"); |
| return -1; |
| } |
| |
| len = answer->nlmsg_len; |
| len -= NLMSG_LENGTH(sizeof(*ifi)); |
| if (len < 0) |
| goto get_failed; |
| |
| parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len); |
| |
| if (!tb[IFLA_LINKINFO]) |
| goto get_failed; |
| |
| parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]); |
| |
| if (!linkinfo[IFLA_INFO_DATA]) |
| goto get_failed; |
| |
| parse_rtattr_nested(iptuninfo, IFLA_IPTUN_MAX, |
| linkinfo[IFLA_INFO_DATA]); |
| |
| rta = iptuninfo[IFLA_IPTUN_LOCAL]; |
| if (rta && get_addr_rta(&saddr, rta, AF_INET)) |
| goto get_failed; |
| |
| rta = iptuninfo[IFLA_IPTUN_REMOTE]; |
| if (rta && get_addr_rta(&daddr, rta, AF_INET)) |
| goto get_failed; |
| |
| rta = iptuninfo[IFLA_IPTUN_6RD_PREFIX]; |
| if (rta && get_addr_rta(&ip6rdprefix, rta, AF_INET6)) |
| goto get_failed; |
| |
| rta = iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX]; |
| if (rta && get_addr_rta(&ip6rdrelayprefix, rta, AF_INET)) |
| goto get_failed; |
| |
| rta = iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN]; |
| ip6rdprefix.bitlen = rta ? rta_getattr_u16(rta) : 0; |
| |
| rta = iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]; |
| ip6rdrelayprefix.bitlen = rta ? rta_getattr_u16(rta) : 0; |
| |
| if (iptuninfo[IFLA_IPTUN_TTL]) |
| ttl = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]); |
| |
| if (iptuninfo[IFLA_IPTUN_PMTUDISC]) |
| pmtudisc = |
| rta_getattr_u8(iptuninfo[IFLA_IPTUN_PMTUDISC]); |
| |
| if (iptuninfo[IFLA_IPTUN_TOS]) |
| tos = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TOS]); |
| |
| if (iptuninfo[IFLA_IPTUN_FLAGS]) |
| iflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_FLAGS]); |
| |
| if (iptuninfo[IFLA_IPTUN_LINK]) |
| link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]); |
| |
| if (iptuninfo[IFLA_IPTUN_PROTO]) |
| proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]); |
| |
| if (iptuninfo[IFLA_IPTUN_ENCAP_TYPE]) |
| encaptype = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_TYPE]); |
| if (iptuninfo[IFLA_IPTUN_ENCAP_FLAGS]) |
| encapflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_FLAGS]); |
| if (iptuninfo[IFLA_IPTUN_ENCAP_SPORT]) |
| encapsport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_SPORT]); |
| if (iptuninfo[IFLA_IPTUN_ENCAP_DPORT]) |
| encapdport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_DPORT]); |
| |
| if (iptuninfo[IFLA_IPTUN_COLLECT_METADATA]) |
| metadata = 1; |
| |
| if (iptuninfo[IFLA_IPTUN_FWMARK]) |
| fwmark = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FWMARK]); |
| |
| free(answer); |
| } |
| |
| while (argc > 0) { |
| if (strcmp(*argv, "mode") == 0) { |
| NEXT_ARG(); |
| if (strcmp(lu->id, "sit") == 0 && |
| (strcmp(*argv, "ipv6/ipv4") == 0 || |
| strcmp(*argv, "ip6ip") == 0)) |
| proto = IPPROTO_IPV6; |
| else if (strcmp(*argv, "ipv4/ipv4") == 0 || |
| strcmp(*argv, "ipip") == 0 || |
| strcmp(*argv, "ip4ip4") == 0) |
| proto = IPPROTO_IPIP; |
| else if (strcmp(*argv, "mpls/ipv4") == 0 || |
| strcmp(*argv, "mplsip") == 0) |
| proto = IPPROTO_MPLS; |
| else if (strcmp(*argv, "any/ipv4") == 0 || |
| strcmp(*argv, "any") == 0) |
| proto = 0; |
| else |
| invarg("Cannot guess tunnel mode.", *argv); |
| } else if (strcmp(*argv, "remote") == 0) { |
| NEXT_ARG(); |
| get_addr(&daddr, *argv, AF_INET); |
| } else if (strcmp(*argv, "local") == 0) { |
| NEXT_ARG(); |
| get_addr(&saddr, *argv, AF_INET); |
| } else if (matches(*argv, "dev") == 0) { |
| NEXT_ARG(); |
| link = ll_name_to_index(*argv); |
| if (!link) |
| exit(nodev(*argv)); |
| } else if (strcmp(*argv, "ttl") == 0 || |
| strcmp(*argv, "hoplimit") == 0 || |
| strcmp(*argv, "hlim") == 0) { |
| NEXT_ARG(); |
| if (strcmp(*argv, "inherit") != 0) { |
| if (get_u8(&ttl, *argv, 0)) |
| invarg("invalid TTL\n", *argv); |
| } else |
| ttl = 0; |
| } else if (strcmp(*argv, "tos") == 0 || |
| strcmp(*argv, "tclass") == 0 || |
| strcmp(*argv, "tc") == 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); |
| tos = uval; |
| } else |
| tos = 1; |
| } else if (strcmp(*argv, "nopmtudisc") == 0) { |
| pmtudisc = 0; |
| } else if (strcmp(*argv, "pmtudisc") == 0) { |
| pmtudisc = 1; |
| } else if (strcmp(lu->id, "sit") == 0 && |
| strcmp(*argv, "isatap") == 0) { |
| iflags |= SIT_ISATAP; |
| } else if (strcmp(*argv, "noencap") == 0) { |
| encaptype = TUNNEL_ENCAP_NONE; |
| } else if (strcmp(*argv, "encap") == 0) { |
| NEXT_ARG(); |
| if (strcmp(*argv, "fou") == 0) |
| encaptype = TUNNEL_ENCAP_FOU; |
| else if (strcmp(*argv, "gue") == 0) |
| encaptype = TUNNEL_ENCAP_GUE; |
| else if (strcmp(*argv, "none") == 0) |
| encaptype = TUNNEL_ENCAP_NONE; |
| else |
| invarg("Invalid encap type.", *argv); |
| } else if (strcmp(*argv, "encap-sport") == 0) { |
| NEXT_ARG(); |
| if (strcmp(*argv, "auto") == 0) |
| encapsport = 0; |
| else if (get_u16(&encapsport, *argv, 0)) |
| invarg("Invalid source port.", *argv); |
| } else if (strcmp(*argv, "encap-dport") == 0) { |
| NEXT_ARG(); |
| if (get_u16(&encapdport, *argv, 0)) |
| invarg("Invalid destination port.", *argv); |
| } else if (strcmp(*argv, "encap-csum") == 0) { |
| encapflags |= TUNNEL_ENCAP_FLAG_CSUM; |
| } else if (strcmp(*argv, "noencap-csum") == 0) { |
| encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM; |
| } else if (strcmp(*argv, "encap-udp6-csum") == 0) { |
| encapflags |= TUNNEL_ENCAP_FLAG_CSUM6; |
| } else if (strcmp(*argv, "noencap-udp6-csum") == 0) { |
| encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6; |
| } else if (strcmp(*argv, "encap-remcsum") == 0) { |
| encapflags |= TUNNEL_ENCAP_FLAG_REMCSUM; |
| } else if (strcmp(*argv, "noencap-remcsum") == 0) { |
| encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM; |
| } else if (strcmp(*argv, "external") == 0) { |
| metadata = 1; |
| } else if (strcmp(*argv, "6rd-prefix") == 0) { |
| NEXT_ARG(); |
| if (get_prefix(&ip6rdprefix, *argv, AF_INET6)) |
| invarg("invalid 6rd_prefix\n", *argv); |
| } else if (strcmp(*argv, "6rd-relay_prefix") == 0) { |
| NEXT_ARG(); |
| if (get_prefix(&ip6rdrelayprefix, *argv, AF_INET)) |
| invarg("invalid 6rd-relay_prefix\n", *argv); |
| } else if (strcmp(*argv, "6rd-reset") == 0) { |
| get_prefix(&ip6rdprefix, "2002::/16", AF_INET6); |
| inet_prefix_reset(&ip6rdrelayprefix); |
| } else if (strcmp(*argv, "fwmark") == 0) { |
| NEXT_ARG(); |
| if (get_u32(&fwmark, *argv, 0)) |
| invarg("invalid fwmark\n", *argv); |
| } else { |
| iptunnel_print_help(lu, argc, argv, stderr); |
| return -1; |
| } |
| argc--, argv++; |
| } |
| |
| if (ttl && pmtudisc == 0) { |
| fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n"); |
| exit(-1); |
| } |
| |
| addattr8(n, 1024, IFLA_IPTUN_PROTO, proto); |
| if (metadata) { |
| addattr_l(n, 1024, IFLA_IPTUN_COLLECT_METADATA, NULL, 0); |
| return 0; |
| } |
| |
| if (is_addrtype_inet_not_unspec(&saddr)) { |
| addattr_l(n, 1024, IFLA_IPTUN_LOCAL, |
| saddr.data, saddr.bytelen); |
| } |
| if (is_addrtype_inet_not_unspec(&daddr)) { |
| addattr_l(n, 1024, IFLA_IPTUN_REMOTE, |
| daddr.data, daddr.bytelen); |
| } |
| addattr8(n, 1024, IFLA_IPTUN_PMTUDISC, pmtudisc); |
| addattr8(n, 1024, IFLA_IPTUN_TOS, tos); |
| addattr8(n, 1024, IFLA_IPTUN_TTL, ttl); |
| addattr32(n, 1024, IFLA_IPTUN_LINK, link); |
| addattr32(n, 1024, IFLA_IPTUN_FWMARK, fwmark); |
| |
| addattr16(n, 1024, IFLA_IPTUN_ENCAP_TYPE, encaptype); |
| addattr16(n, 1024, IFLA_IPTUN_ENCAP_FLAGS, encapflags); |
| addattr16(n, 1024, IFLA_IPTUN_ENCAP_SPORT, htons(encapsport)); |
| addattr16(n, 1024, IFLA_IPTUN_ENCAP_DPORT, htons(encapdport)); |
| |
| if (strcmp(lu->id, "sit") == 0) { |
| addattr16(n, 1024, IFLA_IPTUN_FLAGS, iflags); |
| if (is_addrtype_inet(&ip6rdprefix)) { |
| addattr_l(n, 1024, IFLA_IPTUN_6RD_PREFIX, |
| ip6rdprefix.data, ip6rdprefix.bytelen); |
| addattr16(n, 1024, IFLA_IPTUN_6RD_PREFIXLEN, |
| ip6rdprefix.bitlen); |
| } |
| if (is_addrtype_inet(&ip6rdrelayprefix)) { |
| addattr32(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIX, |
| ip6rdrelayprefix.data[0]); |
| addattr16(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, |
| ip6rdrelayprefix.bitlen); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void iptunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[]) |
| { |
| char s2[64]; |
| __u16 prefixlen; |
| __u8 ttl = 0; |
| __u8 tos = 0; |
| |
| if (!tb) |
| return; |
| |
| if (tb[IFLA_IPTUN_COLLECT_METADATA]) { |
| print_bool(PRINT_ANY, "external", "external ", true); |
| return; |
| } |
| |
| if (tb[IFLA_IPTUN_PROTO]) { |
| switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) { |
| case IPPROTO_IPIP: |
| print_string(PRINT_ANY, "proto", "%s ", "ipip"); |
| break; |
| case IPPROTO_IPV6: |
| print_string(PRINT_ANY, "proto", "%s ", "ip6ip"); |
| break; |
| case IPPROTO_MPLS: |
| print_string(PRINT_ANY, "proto", "%s ", "mplsip"); |
| break; |
| case 0: |
| print_string(PRINT_ANY, "proto", "%s ", "any"); |
| break; |
| } |
| } |
| |
| tnl_print_endpoint("remote", tb[IFLA_IPTUN_REMOTE], AF_INET); |
| tnl_print_endpoint("local", tb[IFLA_IPTUN_LOCAL], AF_INET); |
| |
| if (tb[IFLA_IPTUN_LINK]) { |
| __u32 link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]); |
| |
| if (link) { |
| print_string(PRINT_ANY, "link", "dev %s ", |
| ll_index_to_name(link)); |
| } |
| } |
| |
| if (tb[IFLA_IPTUN_TTL]) |
| ttl = rta_getattr_u8(tb[IFLA_IPTUN_TTL]); |
| if (is_json_context() || ttl) |
| print_uint(PRINT_ANY, "ttl", "ttl %u ", ttl); |
| else |
| print_string(PRINT_FP, NULL, "ttl %s ", "inherit"); |
| |
| if (tb[IFLA_IPTUN_TOS]) |
| tos = rta_getattr_u8(tb[IFLA_IPTUN_TOS]); |
| if (tos) { |
| if (is_json_context() || tos != 1) |
| print_0xhex(PRINT_ANY, "tos", "tos %#llx ", tos); |
| else |
| print_string(PRINT_FP, NULL, "tos %s ", "inherit"); |
| } |
| |
| if (tb[IFLA_IPTUN_PMTUDISC] && rta_getattr_u8(tb[IFLA_IPTUN_PMTUDISC])) |
| print_bool(PRINT_ANY, "pmtudisc", "pmtudisc ", true); |
| else |
| print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false); |
| |
| if (tb[IFLA_IPTUN_FLAGS]) { |
| __u16 iflags = rta_getattr_u16(tb[IFLA_IPTUN_FLAGS]); |
| |
| if (iflags & SIT_ISATAP) |
| print_bool(PRINT_ANY, "isatap", "isatap ", true); |
| } |
| |
| if (tb[IFLA_IPTUN_6RD_PREFIXLEN] && |
| (prefixlen = rta_getattr_u16(tb[IFLA_IPTUN_6RD_PREFIXLEN]))) { |
| __u16 relayprefixlen = |
| rta_getattr_u16(tb[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); |
| __u32 relayprefix = |
| rta_getattr_u32(tb[IFLA_IPTUN_6RD_RELAY_PREFIX]); |
| |
| const char *prefix = inet_ntop(AF_INET6, |
| RTA_DATA(tb[IFLA_IPTUN_6RD_PREFIX]), |
| s2, sizeof(s2)); |
| |
| if (is_json_context()) { |
| print_string(PRINT_JSON, "prefix", NULL, prefix); |
| print_int(PRINT_JSON, "prefixlen", NULL, prefixlen); |
| if (relayprefix) { |
| print_string(PRINT_JSON, |
| "relay_prefix", |
| NULL, |
| format_host(AF_INET, |
| 4, |
| &relayprefix)); |
| print_int(PRINT_JSON, |
| "relay_prefixlen", |
| NULL, |
| relayprefixlen); |
| } |
| } else { |
| printf("6rd-prefix %s/%u ", prefix, prefixlen); |
| if (relayprefix) { |
| printf("6rd-relay_prefix %s/%u ", |
| format_host(AF_INET, 4, &relayprefix), |
| relayprefixlen); |
| } |
| } |
| } |
| |
| if (tb[IFLA_IPTUN_FWMARK]) { |
| __u32 fwmark = rta_getattr_u32(tb[IFLA_IPTUN_FWMARK]); |
| |
| if (fwmark) { |
| print_0xhex(PRINT_ANY, |
| "fwmark", "fwmark %#llx ", fwmark); |
| } |
| } |
| |
| tnl_print_encap(tb, |
| IFLA_IPTUN_ENCAP_TYPE, |
| IFLA_IPTUN_ENCAP_FLAGS, |
| IFLA_IPTUN_ENCAP_SPORT, |
| IFLA_IPTUN_ENCAP_DPORT); |
| } |
| |
| struct link_util ipip_link_util = { |
| .id = "ipip", |
| .maxattr = IFLA_IPTUN_MAX, |
| .parse_opt = iptunnel_parse_opt, |
| .print_opt = iptunnel_print_opt, |
| .print_help = iptunnel_print_help, |
| }; |
| |
| struct link_util sit_link_util = { |
| .id = "sit", |
| .maxattr = IFLA_IPTUN_MAX, |
| .parse_opt = iptunnel_parse_opt, |
| .print_opt = iptunnel_print_opt, |
| .print_help = iptunnel_print_help, |
| }; |