| /* |
| * link_ip6tnl.c ip6tnl 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/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" |
| |
| #define IP6_FLOWINFO_TCLASS htonl(0x0FF00000) |
| #define IP6_FLOWINFO_FLOWLABEL htonl(0x000FFFFF) |
| |
| #define DEFAULT_TNL_HOP_LIMIT (64) |
| |
| static void ip6tunnel_print_help(struct link_util *lu, int argc, char **argv, |
| FILE *f) |
| { |
| fprintf(f, |
| "Usage: ... %-6s [ remote ADDR ]\n" |
| " [ local ADDR ]\n" |
| " [ encaplimit ELIM ]\n" |
| " [ hoplimit HLIM ]\n" |
| " [ tclass TCLASS ]\n" |
| " [ flowlabel FLOWLABEL ]\n" |
| " [ dscp inherit ]\n" |
| " [ [no]allow-localremote ]\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 { ip6ip6 | ipip6 | any } ]\n" |
| "\n" |
| "Where: ADDR := IPV6_ADDRESS\n" |
| " ELIM := { none | 0..255 }(default=%d)\n" |
| " HLIM := 0..255 (default=%d)\n" |
| " TCLASS := { 0x0..0xff | inherit }\n" |
| " FLOWLABEL := { 0x0..0xfffff | inherit }\n" |
| " MARK := { 0x0..0xffffffff | inherit }\n", |
| lu->id, |
| IPV6_DEFAULT_TNL_ENCAP_LIMIT, DEFAULT_TNL_HOP_LIMIT); |
| } |
| |
| static int ip6tunnel_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; |
| __u8 hop_limit = DEFAULT_TNL_HOP_LIMIT; |
| __u8 encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT; |
| __u32 flowinfo = 0; |
| __u32 flags = 0; |
| __u8 proto = 0; |
| __u32 link = 0; |
| __u16 encaptype = 0; |
| __u16 encapflags = TUNNEL_ENCAP_FLAG_CSUM6; |
| __u16 encapsport = 0; |
| __u16 encapdport = 0; |
| __u8 metadata = 0; |
| __u32 fwmark = 0; |
| |
| inet_prefix_reset(&saddr); |
| inet_prefix_reset(&daddr); |
| |
| 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_INET6)) |
| goto get_failed; |
| |
| rta = iptuninfo[IFLA_IPTUN_REMOTE]; |
| if (rta && get_addr_rta(&daddr, rta, AF_INET6)) |
| goto get_failed; |
| |
| if (iptuninfo[IFLA_IPTUN_TTL]) |
| hop_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]); |
| |
| if (iptuninfo[IFLA_IPTUN_ENCAP_LIMIT]) |
| encap_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_ENCAP_LIMIT]); |
| |
| if (iptuninfo[IFLA_IPTUN_FLOWINFO]) |
| flowinfo = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLOWINFO]); |
| |
| if (iptuninfo[IFLA_IPTUN_FLAGS]) |
| flags = rta_getattr_u32(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_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(*argv, "ipv6/ipv6") == 0 || |
| strcmp(*argv, "ip6ip6") == 0) |
| proto = IPPROTO_IPV6; |
| else if (strcmp(*argv, "ip/ipv6") == 0 || |
| strcmp(*argv, "ipv4/ipv6") == 0 || |
| strcmp(*argv, "ipip6") == 0 || |
| strcmp(*argv, "ip4ip6") == 0) |
| proto = IPPROTO_IPIP; |
| else if (strcmp(*argv, "any/ipv6") == 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_INET6); |
| } else if (strcmp(*argv, "local") == 0) { |
| NEXT_ARG(); |
| get_addr(&saddr, *argv, AF_INET6); |
| } 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(&hop_limit, *argv, 0)) |
| invarg("invalid HLIM\n", *argv); |
| } else |
| hop_limit = 0; |
| } else if (strcmp(*argv, "encaplimit") == 0) { |
| NEXT_ARG(); |
| if (strcmp(*argv, "none") == 0) { |
| flags |= IP6_TNL_F_IGN_ENCAP_LIMIT; |
| } else { |
| __u8 uval; |
| |
| if (get_u8(&uval, *argv, 0) < -1) |
| invarg("invalid ELIM", *argv); |
| encap_limit = uval; |
| flags &= ~IP6_TNL_F_IGN_ENCAP_LIMIT; |
| } |
| } else if (strcmp(*argv, "tos") == 0 || |
| strcmp(*argv, "tclass") == 0 || |
| strcmp(*argv, "tc") == 0 || |
| matches(*argv, "dsfield") == 0) { |
| __u8 uval; |
| |
| NEXT_ARG(); |
| flowinfo &= ~IP6_FLOWINFO_TCLASS; |
| if (strcmp(*argv, "inherit") == 0) |
| flags |= IP6_TNL_F_USE_ORIG_TCLASS; |
| else { |
| if (get_u8(&uval, *argv, 16)) |
| invarg("invalid TClass", *argv); |
| flowinfo |= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS; |
| flags &= ~IP6_TNL_F_USE_ORIG_TCLASS; |
| } |
| } else if (strcmp(*argv, "flowlabel") == 0 || |
| strcmp(*argv, "fl") == 0) { |
| __u32 uval; |
| |
| NEXT_ARG(); |
| flowinfo &= ~IP6_FLOWINFO_FLOWLABEL; |
| if (strcmp(*argv, "inherit") == 0) |
| flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL; |
| else { |
| if (get_u32(&uval, *argv, 16)) |
| invarg("invalid Flowlabel", *argv); |
| if (uval > 0xFFFFF) |
| invarg("invalid Flowlabel", *argv); |
| flowinfo |= htonl(uval) & IP6_FLOWINFO_FLOWLABEL; |
| flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL; |
| } |
| } else if (strcmp(*argv, "dscp") == 0) { |
| NEXT_ARG(); |
| if (strcmp(*argv, "inherit") != 0) |
| invarg("not inherit", *argv); |
| flags |= IP6_TNL_F_RCV_DSCP_COPY; |
| } else if (strcmp(*argv, "fwmark") == 0) { |
| NEXT_ARG(); |
| if (strcmp(*argv, "inherit") == 0) { |
| flags |= IP6_TNL_F_USE_ORIG_FWMARK; |
| fwmark = 0; |
| } else { |
| if (get_u32(&fwmark, *argv, 0)) |
| invarg("invalid fwmark\n", *argv); |
| flags &= ~IP6_TNL_F_USE_ORIG_FWMARK; |
| } |
| } else if (strcmp(*argv, "allow-localremote") == 0) { |
| flags |= IP6_TNL_F_ALLOW_LOCAL_REMOTE; |
| } else if (strcmp(*argv, "noallow-localremote") == 0) { |
| flags &= ~IP6_TNL_F_ALLOW_LOCAL_REMOTE; |
| } 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 { |
| ip6tunnel_print_help(lu, argc, argv, stderr); |
| return -1; |
| } |
| argc--, argv++; |
| } |
| |
| 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_TTL, hop_limit); |
| addattr8(n, 1024, IFLA_IPTUN_ENCAP_LIMIT, encap_limit); |
| addattr32(n, 1024, IFLA_IPTUN_FLOWINFO, flowinfo); |
| addattr32(n, 1024, IFLA_IPTUN_FLAGS, flags); |
| 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)); |
| |
| return 0; |
| } |
| |
| static void ip6tunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[]) |
| { |
| char s2[64]; |
| __u32 flags = 0; |
| __u32 flowinfo = 0; |
| __u8 ttl = 0; |
| |
| if (!tb) |
| return; |
| |
| if (tb[IFLA_IPTUN_COLLECT_METADATA]) { |
| print_bool(PRINT_ANY, "external", "external ", true); |
| } |
| |
| if (tb[IFLA_IPTUN_FLAGS]) |
| flags = rta_getattr_u32(tb[IFLA_IPTUN_FLAGS]); |
| |
| if (tb[IFLA_IPTUN_FLOWINFO]) |
| flowinfo = rta_getattr_u32(tb[IFLA_IPTUN_FLOWINFO]); |
| |
| if (tb[IFLA_IPTUN_PROTO]) { |
| switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) { |
| case IPPROTO_IPIP: |
| print_string(PRINT_ANY, "proto", "%s ", "ipip6"); |
| break; |
| case IPPROTO_IPV6: |
| print_string(PRINT_ANY, "proto", "%s ", "ip6ip6"); |
| break; |
| case 0: |
| print_string(PRINT_ANY, "proto", "%s ", "any"); |
| break; |
| } |
| } |
| |
| tnl_print_endpoint("remote", tb[IFLA_IPTUN_REMOTE], AF_INET6); |
| tnl_print_endpoint("local", tb[IFLA_IPTUN_LOCAL], AF_INET6); |
| |
| 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", "hoplimit %u ", ttl); |
| else |
| print_string(PRINT_FP, NULL, "hoplimit %s ", "inherit"); |
| |
| if (flags & IP6_TNL_F_IGN_ENCAP_LIMIT) { |
| print_bool(PRINT_ANY, |
| "ip6_tnl_f_ign_encap_limit", |
| "encaplimit none ", |
| true); |
| } else if (tb[IFLA_IPTUN_ENCAP_LIMIT]) { |
| __u8 val = rta_getattr_u8(tb[IFLA_IPTUN_ENCAP_LIMIT]); |
| |
| print_uint(PRINT_ANY, "encap_limit", "encaplimit %u ", val); |
| } |
| |
| if (flags & IP6_TNL_F_USE_ORIG_TCLASS) { |
| print_bool(PRINT_ANY, |
| "ip6_tnl_f_use_orig_tclass", |
| "tclass inherit ", |
| true); |
| } else if (tb[IFLA_IPTUN_FLOWINFO]) { |
| __u32 val = ntohl(flowinfo & IP6_FLOWINFO_TCLASS) >> 20; |
| |
| snprintf(s2, sizeof(s2), "0x%02x", val); |
| print_string(PRINT_ANY, "tclass", "tclass %s ", s2); |
| } |
| |
| if (flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) { |
| print_bool(PRINT_ANY, |
| "ip6_tnl_f_use_orig_flowlabel", |
| "flowlabel inherit ", |
| true); |
| } else if (tb[IFLA_IPTUN_FLOWINFO]) { |
| __u32 val = ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL); |
| |
| snprintf(s2, sizeof(s2), "0x%05x", val); |
| print_string(PRINT_ANY, "flowlabel", "flowlabel %s ", s2); |
| } |
| |
| if (flags & IP6_TNL_F_RCV_DSCP_COPY) |
| print_bool(PRINT_ANY, |
| "ip6_tnl_f_rcv_dscp_copy", |
| "dscp inherit ", |
| true); |
| |
| if (flags & IP6_TNL_F_MIP6_DEV) |
| print_bool(PRINT_ANY, "ip6_tnl_f_mip6_dev", "mip6 ", true); |
| |
| if (flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) |
| print_bool(PRINT_ANY, |
| "ip6_tnl_f_allow_local_remote", |
| "allow-localremote ", |
| true); |
| |
| if (flags & IP6_TNL_F_USE_ORIG_FWMARK) { |
| print_bool(PRINT_ANY, |
| "ip6_tnl_f_use_orig_fwmark", |
| "fwmark inherit ", |
| true); |
| } else 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 ip6tnl_link_util = { |
| .id = "ip6tnl", |
| .maxattr = IFLA_IPTUN_MAX, |
| .parse_opt = ip6tunnel_parse_opt, |
| .print_opt = ip6tunnel_print_opt, |
| .print_help = ip6tunnel_print_help, |
| }; |