| /* |
| * 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 usage(void) __attribute__((noreturn)); |
| static void usage(void) |
| { |
| fprintf(stderr, "Usage: ip link { add | set | change | replace | del } NAME\n"); |
| fprintf(stderr, " [ mode { ip6ip6 | ipip6 | any } ]\n"); |
| fprintf(stderr, " type ip6tnl [ remote ADDR ] [ local ADDR ]\n"); |
| fprintf(stderr, " [ dev PHYS_DEV ] [ encaplimit ELIM ]\n"); |
| fprintf(stderr ," [ hoplimit HLIM ] [ tclass TCLASS ] [ flowlabel FLOWLABEL ]\n"); |
| fprintf(stderr, " [ dscp inherit ] [ fwmark inherit ]\n"); |
| fprintf(stderr, "\n"); |
| fprintf(stderr, "Where: NAME := STRING\n"); |
| fprintf(stderr, " ADDR := IPV6_ADDRESS\n"); |
| fprintf(stderr, " ELIM := { none | 0..255 }(default=%d)\n", |
| IPV6_DEFAULT_TNL_ENCAP_LIMIT); |
| fprintf(stderr, " HLIM := 0..255 (default=%d)\n", |
| DEFAULT_TNL_HOP_LIMIT); |
| fprintf(stderr, " TCLASS := { 0x0..0xff | inherit }\n"); |
| fprintf(stderr, " FLOWLABEL := { 0x0..0xfffff | inherit }\n"); |
| exit(-1); |
| } |
| |
| static int ip6tunnel_parse_opt(struct link_util *lu, int argc, char **argv, |
| struct nlmsghdr *n) |
| { |
| struct { |
| struct nlmsghdr n; |
| struct ifinfomsg i; |
| char buf[2048]; |
| } req; |
| struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1); |
| struct rtattr *tb[IFLA_MAX + 1]; |
| struct rtattr *linkinfo[IFLA_INFO_MAX+1]; |
| struct rtattr *iptuninfo[IFLA_IPTUN_MAX + 1]; |
| int len; |
| struct in6_addr laddr; |
| struct in6_addr raddr; |
| __u8 hop_limit = DEFAULT_TNL_HOP_LIMIT; |
| __u8 encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT; |
| __u32 flowinfo = 0; |
| __u32 flags = 0; |
| __u32 link = 0; |
| __u8 proto = 0; |
| |
| memset(&laddr, 0, sizeof(laddr)); |
| memset(&raddr, 0, sizeof(raddr)); |
| |
| if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
| memset(&req, 0, sizeof(req)); |
| |
| req.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)); |
| req.n.nlmsg_flags = NLM_F_REQUEST; |
| req.n.nlmsg_type = RTM_GETLINK; |
| req.i.ifi_family = preferred_family; |
| req.i.ifi_index = ifi->ifi_index; |
| |
| if (rtnl_talk(&rth, &req.n, 0, 0, &req.n) < 0) { |
| get_failed: |
| fprintf(stderr, |
| "Failed to get existing tunnel info.\n"); |
| return -1; |
| } |
| |
| len = req.n.nlmsg_len; |
| len -= NLMSG_LENGTH(sizeof(*ifi)); |
| if (len < 0) |
| goto get_failed; |
| |
| parse_rtattr(tb, IFLA_MAX, IFLA_RTA(&req.i), 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]); |
| |
| if (iptuninfo[IFLA_IPTUN_LOCAL]) |
| memcpy(&laddr, RTA_DATA(iptuninfo[IFLA_IPTUN_LOCAL]), |
| sizeof(laddr)); |
| |
| if (iptuninfo[IFLA_IPTUN_REMOTE]) |
| memcpy(&raddr, RTA_DATA(iptuninfo[IFLA_IPTUN_REMOTE]), |
| sizeof(raddr)); |
| |
| 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]); |
| } |
| |
| while (argc > 0) { |
| if (matches(*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) { |
| inet_prefix addr; |
| NEXT_ARG(); |
| get_prefix(&addr, *argv, preferred_family); |
| if (addr.family == AF_UNSPEC) |
| invarg("\"remote\" address family is AF_UNSPEC", *argv); |
| memcpy(&raddr, addr.data, addr.bytelen); |
| } else if (strcmp(*argv, "local") == 0) { |
| inet_prefix addr; |
| NEXT_ARG(); |
| get_prefix(&addr, *argv, preferred_family); |
| if (addr.family == AF_UNSPEC) |
| invarg("\"local\" address family is AF_UNSPEC", *argv); |
| memcpy(&laddr, addr.data, addr.bytelen); |
| } else if (matches(*argv, "dev") == 0) { |
| NEXT_ARG(); |
| link = if_nametoindex(*argv); |
| if (link == 0) |
| invarg("\"dev\" is invalid", *argv); |
| } else if (strcmp(*argv, "hoplimit") == 0 || |
| strcmp(*argv, "ttl") == 0 || |
| strcmp(*argv, "hlim") == 0) { |
| __u8 uval; |
| NEXT_ARG(); |
| if (get_u8(&uval, *argv, 0)) |
| invarg("invalid HLIM", *argv); |
| hop_limit = uval; |
| } else if (matches(*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, "tclass") == 0 || |
| strcmp(*argv, "tc") == 0 || |
| strcmp(*argv, "tos") == 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) |
| invarg("not inherit", *argv); |
| flags |= IP6_TNL_F_USE_ORIG_FWMARK; |
| } else |
| usage(); |
| argc--, argv++; |
| } |
| |
| addattr8(n, 1024, IFLA_IPTUN_PROTO, proto); |
| addattr_l(n, 1024, IFLA_IPTUN_LOCAL, &laddr, sizeof(laddr)); |
| addattr_l(n, 1024, IFLA_IPTUN_REMOTE, &raddr, sizeof(raddr)); |
| 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); |
| |
| return 0; |
| } |
| |
| static void ip6tunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[]) |
| { |
| char s1[256]; |
| char s2[64]; |
| int flags = 0; |
| __u32 flowinfo = 0; |
| |
| if (!tb) |
| return; |
| |
| 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: |
| fprintf(f, "ipip6 "); |
| break; |
| case IPPROTO_IPV6: |
| fprintf(f, "ip6ip6 "); |
| break; |
| case 0: |
| fprintf(f, "any "); |
| break; |
| } |
| } |
| |
| if (tb[IFLA_IPTUN_REMOTE]) { |
| fprintf(f, "remote %s ", |
| rt_addr_n2a(AF_INET6, |
| RTA_PAYLOAD(tb[IFLA_IPTUN_REMOTE]), |
| RTA_DATA(tb[IFLA_IPTUN_REMOTE]), |
| s1, sizeof(s1))); |
| } |
| |
| if (tb[IFLA_IPTUN_LOCAL]) { |
| fprintf(f, "local %s ", |
| rt_addr_n2a(AF_INET6, |
| RTA_PAYLOAD(tb[IFLA_IPTUN_LOCAL]), |
| RTA_DATA(tb[IFLA_IPTUN_LOCAL]), |
| s1, sizeof(s1))); |
| } |
| |
| if (tb[IFLA_IPTUN_LINK] && rta_getattr_u32(tb[IFLA_IPTUN_LINK])) { |
| unsigned link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]); |
| const char *n = if_indextoname(link, s2); |
| |
| if (n) |
| fprintf(f, "dev %s ", n); |
| else |
| fprintf(f, "dev %u ", link); |
| } |
| |
| if (flags & IP6_TNL_F_IGN_ENCAP_LIMIT) |
| printf("encaplimit none "); |
| else if (tb[IFLA_IPTUN_ENCAP_LIMIT]) |
| fprintf(f, "encaplimit %u ", |
| rta_getattr_u8(tb[IFLA_IPTUN_ENCAP_LIMIT])); |
| |
| if (tb[IFLA_IPTUN_TTL]) |
| fprintf(f, "hoplimit %u ", rta_getattr_u8(tb[IFLA_IPTUN_TTL])); |
| |
| if (flags & IP6_TNL_F_USE_ORIG_TCLASS) |
| printf("tclass inherit "); |
| else if (tb[IFLA_IPTUN_FLOWINFO]) { |
| __u32 val = ntohl(flowinfo & IP6_FLOWINFO_TCLASS); |
| |
| printf("tclass 0x%02x ", (__u8)(val >> 20)); |
| } |
| |
| if (flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
| printf("flowlabel inherit "); |
| else |
| printf("flowlabel 0x%05x ", ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL)); |
| |
| printf("(flowinfo 0x%08x) ", ntohl(flowinfo)); |
| |
| if (flags & IP6_TNL_F_RCV_DSCP_COPY) |
| printf("dscp inherit "); |
| |
| if (flags & IP6_TNL_F_MIP6_DEV) |
| fprintf(f, "mip6 "); |
| |
| if (flags & IP6_TNL_F_USE_ORIG_FWMARK) |
| fprintf(f, "fwmark inherit "); |
| } |
| |
| struct link_util ip6tnl_link_util = { |
| .id = "ip6tnl", |
| .maxattr = IFLA_IPTUN_MAX, |
| .parse_opt = ip6tunnel_parse_opt, |
| .print_opt = ip6tunnel_print_opt, |
| }; |