| /* |
| * link_gre6.c gre 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: Dmitry Kozlov <xeb@mail.ru> |
| * |
| */ |
| |
| #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 print_usage(FILE *f) |
| { |
| fprintf(f, "Usage: ip link { add | set | change | replace | del } NAME\n"); |
| fprintf(f, " type { ip6gre | ip6gretap } [ remote ADDR ] [ local ADDR ]\n"); |
| fprintf(f, " [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n"); |
| fprintf(f, " [ hoplimit TTL ] [ encaplimit ELIM ]\n"); |
| fprintf(f, " [ tclass TCLASS ] [ flowlabel FLOWLABEL ]\n"); |
| fprintf(f, " [ dscp inherit ] [ dev PHYS_DEV ]\n"); |
| fprintf(f, "\n"); |
| fprintf(f, "Where: NAME := STRING\n"); |
| fprintf(f, " ADDR := IPV6_ADDRESS\n"); |
| fprintf(f, " TTL := { 0..255 } (default=%d)\n", |
| DEFAULT_TNL_HOP_LIMIT); |
| fprintf(f, " KEY := { DOTTED_QUAD | NUMBER }\n"); |
| fprintf(f, " ELIM := { none | 0..255 }(default=%d)\n", |
| IPV6_DEFAULT_TNL_ENCAP_LIMIT); |
| fprintf(f, " TCLASS := { 0x0..0xff | inherit }\n"); |
| fprintf(f, " FLOWLABEL := { 0x0..0xfffff | inherit }\n"); |
| } |
| |
| static void usage(void) __attribute__((noreturn)); |
| static void usage(void) |
| { |
| print_usage(stderr); |
| exit(-1); |
| } |
| |
| static int gre_parse_opt(struct link_util *lu, int argc, char **argv, |
| struct nlmsghdr *n) |
| { |
| struct { |
| struct nlmsghdr n; |
| struct ifinfomsg i; |
| char buf[1024]; |
| } req; |
| struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1); |
| struct rtattr *tb[IFLA_MAX + 1]; |
| struct rtattr *linkinfo[IFLA_INFO_MAX+1]; |
| struct rtattr *greinfo[IFLA_GRE_MAX + 1]; |
| __u16 iflags = 0; |
| __u16 oflags = 0; |
| unsigned ikey = 0; |
| unsigned okey = 0; |
| struct in6_addr raddr = IN6ADDR_ANY_INIT; |
| struct in6_addr laddr = IN6ADDR_ANY_INIT; |
| unsigned link = 0; |
| unsigned flowinfo = 0; |
| unsigned flags = 0; |
| __u8 hop_limit = DEFAULT_TNL_HOP_LIMIT; |
| __u8 encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT; |
| int len; |
| |
| 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, &req.n, sizeof(req)) < 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(greinfo, IFLA_GRE_MAX, |
| linkinfo[IFLA_INFO_DATA]); |
| |
| if (greinfo[IFLA_GRE_IKEY]) |
| ikey = rta_getattr_u32(greinfo[IFLA_GRE_IKEY]); |
| |
| if (greinfo[IFLA_GRE_OKEY]) |
| okey = rta_getattr_u32(greinfo[IFLA_GRE_OKEY]); |
| |
| if (greinfo[IFLA_GRE_IFLAGS]) |
| iflags = rta_getattr_u16(greinfo[IFLA_GRE_IFLAGS]); |
| |
| if (greinfo[IFLA_GRE_OFLAGS]) |
| oflags = rta_getattr_u16(greinfo[IFLA_GRE_OFLAGS]); |
| |
| if (greinfo[IFLA_GRE_LOCAL]) |
| memcpy(&laddr, RTA_DATA(greinfo[IFLA_GRE_LOCAL]), sizeof(laddr)); |
| |
| if (greinfo[IFLA_GRE_REMOTE]) |
| memcpy(&raddr, RTA_DATA(greinfo[IFLA_GRE_REMOTE]), sizeof(raddr)); |
| |
| if (greinfo[IFLA_GRE_TTL]) |
| hop_limit = rta_getattr_u8(greinfo[IFLA_GRE_TTL]); |
| |
| if (greinfo[IFLA_GRE_LINK]) |
| link = rta_getattr_u32(greinfo[IFLA_GRE_LINK]); |
| |
| if (greinfo[IFLA_GRE_ENCAP_LIMIT]) |
| encap_limit = rta_getattr_u8(greinfo[IFLA_GRE_ENCAP_LIMIT]); |
| |
| if (greinfo[IFLA_GRE_FLOWINFO]) |
| flowinfo = rta_getattr_u32(greinfo[IFLA_GRE_FLOWINFO]); |
| |
| if (greinfo[IFLA_GRE_FLAGS]) |
| flags = rta_getattr_u32(greinfo[IFLA_GRE_FLAGS]); |
| } |
| |
| while (argc > 0) { |
| if (!matches(*argv, "key")) { |
| unsigned uval; |
| |
| NEXT_ARG(); |
| iflags |= GRE_KEY; |
| oflags |= GRE_KEY; |
| if (strchr(*argv, '.')) |
| uval = get_addr32(*argv); |
| else { |
| if (get_unsigned(&uval, *argv, 0) < 0) { |
| fprintf(stderr, |
| "Invalid value for \"key\"\n"); |
| exit(-1); |
| } |
| uval = htonl(uval); |
| } |
| |
| ikey = okey = uval; |
| } else if (!matches(*argv, "ikey")) { |
| unsigned uval; |
| |
| NEXT_ARG(); |
| iflags |= GRE_KEY; |
| if (strchr(*argv, '.')) |
| uval = get_addr32(*argv); |
| else { |
| if (get_unsigned(&uval, *argv, 0)<0) { |
| fprintf(stderr, "invalid value of \"ikey\"\n"); |
| exit(-1); |
| } |
| uval = htonl(uval); |
| } |
| ikey = uval; |
| } else if (!matches(*argv, "okey")) { |
| unsigned uval; |
| |
| NEXT_ARG(); |
| oflags |= GRE_KEY; |
| if (strchr(*argv, '.')) |
| uval = get_addr32(*argv); |
| else { |
| if (get_unsigned(&uval, *argv, 0)<0) { |
| fprintf(stderr, "invalid value of \"okey\"\n"); |
| exit(-1); |
| } |
| uval = htonl(uval); |
| } |
| okey = uval; |
| } else if (!matches(*argv, "seq")) { |
| iflags |= GRE_SEQ; |
| oflags |= GRE_SEQ; |
| } else if (!matches(*argv, "iseq")) { |
| iflags |= GRE_SEQ; |
| } else if (!matches(*argv, "oseq")) { |
| oflags |= GRE_SEQ; |
| } else if (!matches(*argv, "csum")) { |
| iflags |= GRE_CSUM; |
| oflags |= GRE_CSUM; |
| } else if (!matches(*argv, "icsum")) { |
| iflags |= GRE_CSUM; |
| } else if (!matches(*argv, "ocsum")) { |
| oflags |= GRE_CSUM; |
| } else if (!matches(*argv, "remote")) { |
| 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, sizeof(raddr)); |
| } else if (!matches(*argv, "local")) { |
| 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, sizeof(laddr)); |
| } else if (!matches(*argv, "dev")) { |
| NEXT_ARG(); |
| link = if_nametoindex(*argv); |
| if (link == 0) { |
| fprintf(stderr, "Cannot find device \"%s\"\n", |
| *argv); |
| exit(-1); |
| } |
| } else if (!matches(*argv, "ttl") || |
| !matches(*argv, "hoplimit")) { |
| __u8 uval; |
| NEXT_ARG(); |
| if (get_u8(&uval, *argv, 0)) |
| invarg("invalid TTL", *argv); |
| hop_limit = uval; |
| } else if (!matches(*argv, "tos") || |
| !matches(*argv, "tclass") || |
| !matches(*argv, "dsfield")) { |
| __u8 uval; |
| NEXT_ARG(); |
| 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(); |
| 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 |
| usage(); |
| argc--; argv++; |
| } |
| |
| addattr32(n, 1024, IFLA_GRE_IKEY, ikey); |
| addattr32(n, 1024, IFLA_GRE_OKEY, okey); |
| addattr_l(n, 1024, IFLA_GRE_IFLAGS, &iflags, 2); |
| addattr_l(n, 1024, IFLA_GRE_OFLAGS, &oflags, 2); |
| addattr_l(n, 1024, IFLA_GRE_LOCAL, &laddr, sizeof(laddr)); |
| addattr_l(n, 1024, IFLA_GRE_REMOTE, &raddr, sizeof(raddr)); |
| if (link) |
| addattr32(n, 1024, IFLA_GRE_LINK, link); |
| addattr_l(n, 1024, IFLA_GRE_TTL, &hop_limit, 1); |
| addattr_l(n, 1024, IFLA_GRE_ENCAP_LIMIT, &encap_limit, 1); |
| addattr_l(n, 1024, IFLA_GRE_FLOWINFO, &flowinfo, 4); |
| addattr_l(n, 1024, IFLA_GRE_FLAGS, &flowinfo, 4); |
| |
| return 0; |
| } |
| |
| static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[]) |
| { |
| char s1[1024]; |
| char s2[64]; |
| const char *local = "any"; |
| const char *remote = "any"; |
| unsigned iflags = 0; |
| unsigned oflags = 0; |
| unsigned flags = 0; |
| unsigned flowinfo = 0; |
| struct in6_addr in6_addr_any = IN6ADDR_ANY_INIT; |
| |
| if (!tb) |
| return; |
| |
| if (tb[IFLA_GRE_FLAGS]) |
| flags = rta_getattr_u32(tb[IFLA_GRE_FLAGS]); |
| |
| if (tb[IFLA_GRE_FLOWINFO]) |
| flags = rta_getattr_u32(tb[IFLA_GRE_FLOWINFO]); |
| |
| if (tb[IFLA_GRE_REMOTE]) { |
| struct in6_addr addr; |
| memcpy(&addr, RTA_DATA(tb[IFLA_GRE_REMOTE]), sizeof(addr)); |
| |
| if (memcmp(&addr, &in6_addr_any, sizeof(addr))) |
| remote = format_host(AF_INET6, sizeof(addr), &addr, s1, sizeof(s1)); |
| } |
| |
| fprintf(f, "remote %s ", remote); |
| |
| if (tb[IFLA_GRE_LOCAL]) { |
| struct in6_addr addr; |
| memcpy(&addr, RTA_DATA(tb[IFLA_GRE_LOCAL]), sizeof(addr)); |
| |
| if (memcmp(&addr, &in6_addr_any, sizeof(addr))) |
| local = format_host(AF_INET6, sizeof(addr), &addr, s1, sizeof(s1)); |
| } |
| |
| fprintf(f, "local %s ", local); |
| |
| if (tb[IFLA_GRE_LINK] && rta_getattr_u32(tb[IFLA_GRE_LINK])) { |
| unsigned link = rta_getattr_u32(tb[IFLA_GRE_LINK]); |
| const char *n = if_indextoname(link, s2); |
| |
| if (n) |
| fprintf(f, "dev %s ", n); |
| else |
| fprintf(f, "dev %u ", link); |
| } |
| |
| if (tb[IFLA_GRE_TTL] && rta_getattr_u8(tb[IFLA_GRE_TTL])) |
| fprintf(f, "hoplimit %d ", rta_getattr_u8(tb[IFLA_GRE_TTL])); |
| |
| if (flags & IP6_TNL_F_IGN_ENCAP_LIMIT) |
| fprintf(f, "encaplimit none "); |
| else if (tb[IFLA_GRE_ENCAP_LIMIT]) { |
| int encap_limit = rta_getattr_u8(tb[IFLA_GRE_ENCAP_LIMIT]); |
| |
| fprintf(f, "encaplimit %d ", encap_limit); |
| } |
| |
| if (flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
| fprintf(f, "flowlabel inherit "); |
| else |
| fprintf(f, "flowlabel 0x%05x ", ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL)); |
| |
| if (flags & IP6_TNL_F_RCV_DSCP_COPY) |
| fprintf(f, "dscp inherit "); |
| |
| if (tb[IFLA_GRE_IFLAGS]) |
| iflags = rta_getattr_u16(tb[IFLA_GRE_IFLAGS]); |
| |
| if (tb[IFLA_GRE_OFLAGS]) |
| oflags = rta_getattr_u16(tb[IFLA_GRE_OFLAGS]); |
| |
| if ((iflags & GRE_KEY) && tb[IFLA_GRE_IKEY]) { |
| inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_IKEY]), s2, sizeof(s2)); |
| fprintf(f, "ikey %s ", s2); |
| } |
| |
| if ((oflags & GRE_KEY) && tb[IFLA_GRE_OKEY]) { |
| inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_OKEY]), s2, sizeof(s2)); |
| fprintf(f, "okey %s ", s2); |
| } |
| |
| if (iflags & GRE_SEQ) |
| fputs("iseq ", f); |
| if (oflags & GRE_SEQ) |
| fputs("oseq ", f); |
| if (iflags & GRE_CSUM) |
| fputs("icsum ", f); |
| if (oflags & GRE_CSUM) |
| fputs("ocsum ", f); |
| } |
| |
| static void gre_print_help(struct link_util *lu, int argc, char **argv, |
| FILE *f) |
| { |
| print_usage(f); |
| } |
| |
| struct link_util ip6gre_link_util = { |
| .id = "ip6gre", |
| .maxattr = IFLA_GRE_MAX, |
| .parse_opt = gre_parse_opt, |
| .print_opt = gre_print_opt, |
| .print_help = gre_print_help, |
| }; |
| |
| struct link_util ip6gretap_link_util = { |
| .id = "ip6gretap", |
| .maxattr = IFLA_GRE_MAX, |
| .parse_opt = gre_parse_opt, |
| .print_opt = gre_print_opt, |
| .print_help = gre_print_help, |
| }; |