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https://git.proxmox.com/git/mirror_iproute2
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72c771b20e
This patch adds support for configuring GRE tunnels using the new rtnl_link interface. This only works on kernels that have the new GRE configuration interface. This is accessed through the "ip link" command. The previous tunnel configuration interface "ip tunnel" remains as it is and should be retained for compatibility with old kernels. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
368 lines
9.1 KiB
C
368 lines
9.1 KiB
C
/*
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* link_gre.c gre driver module
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Herbert Xu <herbert@gondor.apana.org.au>
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*
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*/
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#include <string.h>
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#include <net/if.h>
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#include <linux/if_tunnel.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include "rt_names.h"
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#include "utils.h"
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#include "ip_common.h"
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#include "tunnel.h"
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static void usage(void) __attribute__((noreturn));
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static void usage(void)
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{
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fprintf(stderr, "Usage: ip link { add | set | change | replace | del } NAME\n");
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fprintf(stderr, " type { gre | gretap } [ remote ADDR ] [ local ADDR ]\n");
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fprintf(stderr, " [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n");
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fprintf(stderr, " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "Where: NAME := STRING\n");
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fprintf(stderr, " ADDR := { IP_ADDRESS | any }\n");
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fprintf(stderr, " TOS := { NUMBER | inherit }\n");
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fprintf(stderr, " TTL := { 1..255 | inherit }\n");
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fprintf(stderr, " KEY := { DOTTED_QUAD | NUMBER }\n");
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exit(-1);
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}
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static int gre_parse_opt(struct link_util *lu, int argc, char **argv,
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struct nlmsghdr *n)
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{
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struct {
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struct nlmsghdr n;
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struct ifinfomsg i;
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char buf[1024];
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} req;
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struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
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struct rtattr *tb[IFLA_MAX + 1];
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struct rtattr *linkinfo[IFLA_INFO_MAX+1];
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struct rtattr *greinfo[IFLA_GRE_MAX + 1];
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__u16 iflags = 0;
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__u16 oflags = 0;
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unsigned ikey = 0;
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unsigned okey = 0;
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unsigned saddr = 0;
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unsigned daddr = 0;
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unsigned link = 0;
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__u8 pmtudisc = 1;
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__u8 ttl = 0;
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__u8 tos = 0;
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int len;
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if (!(n->nlmsg_flags & NLM_F_CREATE)) {
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memset(&req, 0, sizeof(req));
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req.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi));
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req.n.nlmsg_flags = NLM_F_REQUEST;
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req.n.nlmsg_type = RTM_GETLINK;
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req.i.ifi_family = preferred_family;
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req.i.ifi_index = ifi->ifi_index;
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if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
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get_failed:
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fprintf(stderr,
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"Failed to get existing tunnel info.\n");
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return -1;
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}
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len = req.n.nlmsg_len;
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len -= NLMSG_LENGTH(sizeof(*ifi));
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if (len < 0)
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goto get_failed;
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parse_rtattr(tb, IFLA_MAX, IFLA_RTA(&req.i), len);
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if (!tb[IFLA_LINKINFO])
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goto get_failed;
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parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
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if (!linkinfo[IFLA_INFO_DATA])
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goto get_failed;
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parse_rtattr_nested(greinfo, IFLA_GRE_MAX,
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linkinfo[IFLA_INFO_DATA]);
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if (greinfo[IFLA_GRE_IKEY])
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ikey = *(__u32 *)RTA_DATA(greinfo[IFLA_GRE_IKEY]);
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if (greinfo[IFLA_GRE_OKEY])
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okey = *(__u32 *)RTA_DATA(greinfo[IFLA_GRE_OKEY]);
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if (greinfo[IFLA_GRE_IFLAGS])
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iflags = *(__u16 *)RTA_DATA(greinfo[IFLA_GRE_IFLAGS]);
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if (greinfo[IFLA_GRE_OFLAGS])
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oflags = *(__u16 *)RTA_DATA(greinfo[IFLA_GRE_OFLAGS]);
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if (greinfo[IFLA_GRE_LOCAL])
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saddr = *(__u32 *)RTA_DATA(greinfo[IFLA_GRE_LOCAL]);
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if (greinfo[IFLA_GRE_REMOTE])
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daddr = *(__u32 *)RTA_DATA(greinfo[IFLA_GRE_REMOTE]);
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if (greinfo[IFLA_GRE_PMTUDISC])
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pmtudisc = *(__u8 *)RTA_DATA(
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greinfo[IFLA_GRE_PMTUDISC]);
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if (greinfo[IFLA_GRE_TTL])
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ttl = *(__u8 *)RTA_DATA(greinfo[IFLA_GRE_TTL]);
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if (greinfo[IFLA_GRE_TOS])
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tos = *(__u8 *)RTA_DATA(greinfo[IFLA_GRE_TOS]);
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if (greinfo[IFLA_GRE_LINK])
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link = *(__u8 *)RTA_DATA(greinfo[IFLA_GRE_LINK]);
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}
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while (argc > 0) {
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if (!matches(*argv, "key")) {
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unsigned uval;
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NEXT_ARG();
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iflags |= GRE_KEY;
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oflags |= GRE_KEY;
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if (strchr(*argv, '.'))
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uval = get_addr32(*argv);
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else {
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if (get_unsigned(&uval, *argv, 0) < 0) {
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fprintf(stderr,
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"Invalid value for \"key\"\n");
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exit(-1);
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}
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uval = htonl(uval);
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}
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ikey = okey = uval;
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} else if (!matches(*argv, "ikey")) {
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unsigned uval;
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NEXT_ARG();
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iflags |= GRE_KEY;
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if (strchr(*argv, '.'))
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uval = get_addr32(*argv);
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else {
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if (get_unsigned(&uval, *argv, 0)<0) {
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fprintf(stderr, "invalid value of \"ikey\"\n");
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exit(-1);
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}
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uval = htonl(uval);
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}
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ikey = uval;
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} else if (!matches(*argv, "okey")) {
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unsigned uval;
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NEXT_ARG();
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oflags |= GRE_KEY;
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if (strchr(*argv, '.'))
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uval = get_addr32(*argv);
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else {
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if (get_unsigned(&uval, *argv, 0)<0) {
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fprintf(stderr, "invalid value of \"okey\"\n");
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exit(-1);
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}
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uval = htonl(uval);
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}
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okey = uval;
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} else if (!matches(*argv, "seq")) {
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iflags |= GRE_SEQ;
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oflags |= GRE_SEQ;
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} else if (!matches(*argv, "iseq")) {
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iflags |= GRE_SEQ;
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} else if (!matches(*argv, "oseq")) {
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oflags |= GRE_SEQ;
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} else if (!matches(*argv, "csum")) {
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iflags |= GRE_CSUM;
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oflags |= GRE_CSUM;
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} else if (!matches(*argv, "icsum")) {
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iflags |= GRE_CSUM;
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} else if (!matches(*argv, "ocsum")) {
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oflags |= GRE_CSUM;
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} else if (!matches(*argv, "nopmtudisc")) {
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pmtudisc = 0;
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} else if (!matches(*argv, "pmtudisc")) {
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pmtudisc = 1;
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} else if (!matches(*argv, "remote")) {
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NEXT_ARG();
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if (strcmp(*argv, "any"))
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daddr = get_addr32(*argv);
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} else if (!matches(*argv, "local")) {
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NEXT_ARG();
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if (strcmp(*argv, "any"))
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saddr = get_addr32(*argv);
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} else if (!matches(*argv, "dev")) {
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NEXT_ARG();
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link = tnl_ioctl_get_ifindex(*argv);
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if (link == 0)
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exit(-1);
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} else if (!matches(*argv, "ttl") ||
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!matches(*argv, "hoplimit")) {
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unsigned uval;
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NEXT_ARG();
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if (strcmp(*argv, "inherit") != 0) {
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if (get_unsigned(&uval, *argv, 0))
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invarg("invalid TTL\n", *argv);
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if (uval > 255)
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invarg("TTL must be <= 255\n", *argv);
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ttl = uval;
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}
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} else if (!matches(*argv, "tos") ||
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!matches(*argv, "tclass") ||
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!matches(*argv, "dsfield")) {
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__u32 uval;
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NEXT_ARG();
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if (strcmp(*argv, "inherit") != 0) {
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if (rtnl_dsfield_a2n(&uval, *argv))
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invarg("bad TOS value", *argv);
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tos = uval;
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} else
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tos = 1;
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} else
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usage();
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argc--; argv++;
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}
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if (!ikey && IN_MULTICAST(ntohl(daddr))) {
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ikey = daddr;
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iflags |= GRE_KEY;
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}
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if (!okey && IN_MULTICAST(ntohl(daddr))) {
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okey = daddr;
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oflags |= GRE_KEY;
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}
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if (IN_MULTICAST(ntohl(daddr)) && !saddr) {
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fprintf(stderr, "Broadcast tunnel requires a source address.\n");
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return -1;
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}
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addattr32(n, 1024, IFLA_GRE_IKEY, ikey);
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addattr32(n, 1024, IFLA_GRE_OKEY, okey);
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addattr_l(n, 1024, IFLA_GRE_IFLAGS, &iflags, 2);
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addattr_l(n, 1024, IFLA_GRE_OFLAGS, &oflags, 2);
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addattr_l(n, 1024, IFLA_GRE_LOCAL, &saddr, 4);
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addattr_l(n, 1024, IFLA_GRE_REMOTE, &daddr, 4);
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addattr_l(n, 1024, IFLA_GRE_PMTUDISC, &pmtudisc, 1);
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if (link)
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addattr32(n, 1024, IFLA_GRE_LINK, link);
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addattr_l(n, 1024, IFLA_GRE_TTL, &ttl, 1);
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addattr_l(n, 1024, IFLA_GRE_TOS, &tos, 1);
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return 0;
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}
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static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
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{
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char s1[1024];
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char s2[64];
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const char *local = "any";
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const char *remote = "any";
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unsigned iflags = 0;
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unsigned oflags = 0;
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if (!tb)
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return;
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if (tb[IFLA_GRE_REMOTE]) {
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unsigned addr = *(__u32 *)RTA_DATA(tb[IFLA_GRE_REMOTE]);
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if (addr)
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remote = format_host(AF_INET, 4, &addr, s1, sizeof(s1));
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}
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fprintf(f, "remote %s ", remote);
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if (tb[IFLA_GRE_LOCAL]) {
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unsigned addr = *(__u32 *)RTA_DATA(tb[IFLA_GRE_LOCAL]);
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if (addr)
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local = format_host(AF_INET, 4, &addr, s1, sizeof(s1));
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}
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fprintf(f, "local %s ", local);
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if (tb[IFLA_GRE_LINK] && *(__u32 *)RTA_DATA(tb[IFLA_GRE_LINK])) {
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unsigned link = *(__u32 *)RTA_DATA(tb[IFLA_GRE_LINK]);
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char *n = tnl_ioctl_get_ifname(link);
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if (n)
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fprintf(f, "dev %s ", n);
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else
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fprintf(f, "dev %u ", link);
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}
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if (tb[IFLA_GRE_TTL] && *(__u8 *)RTA_DATA(tb[IFLA_GRE_TTL]))
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fprintf(f, "ttl %d ", *(__u8 *)RTA_DATA(tb[IFLA_GRE_TTL]));
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else
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fprintf(f, "ttl inherit ");
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if (tb[IFLA_GRE_TOS] && *(__u8 *)RTA_DATA(tb[IFLA_GRE_TOS])) {
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int tos = *(__u8 *)RTA_DATA(tb[IFLA_GRE_TOS]);
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fputs("tos ", f);
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if (tos == 1)
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fputs("inherit ", f);
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else
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fprintf(f, "0x%x ", tos);
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}
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if (tb[IFLA_GRE_PMTUDISC] &&
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!*(__u8 *)RTA_DATA(tb[IFLA_GRE_PMTUDISC]))
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fputs("nopmtudisc ", f);
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if (tb[IFLA_GRE_IFLAGS])
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iflags = *(__u16 *)RTA_DATA(tb[IFLA_GRE_IFLAGS]);
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if (tb[IFLA_GRE_OFLAGS])
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oflags = *(__u16 *)RTA_DATA(tb[IFLA_GRE_OFLAGS]);
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if (iflags & GRE_KEY && tb[IFLA_GRE_IKEY] &&
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*(__u32 *)RTA_DATA(tb[IFLA_GRE_IKEY])) {
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inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_IKEY]), s2, sizeof(s2));
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fprintf(f, "ikey %s ", s2);
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}
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if (oflags & GRE_KEY && tb[IFLA_GRE_OKEY] &&
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*(__u32 *)RTA_DATA(tb[IFLA_GRE_OKEY])) {
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inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_OKEY]), s2, sizeof(s2));
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fprintf(f, "ikey %s ", s2);
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}
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if (iflags & GRE_SEQ)
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fputs("iseq ", f);
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if (oflags & GRE_SEQ)
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fputs("oseq ", f);
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if (iflags & GRE_CSUM)
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fputs("icsum ", f);
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if (oflags & GRE_CSUM)
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fputs("ocsum ", f);
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}
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struct link_util gre_link_util = {
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.id = "gre",
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.maxattr = IFLA_GRE_MAX,
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.parse_opt = gre_parse_opt,
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.print_opt = gre_print_opt,
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};
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struct link_util gretap_link_util = {
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.id = "gretap",
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.maxattr = IFLA_GRE_MAX,
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.parse_opt = gre_parse_opt,
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.print_opt = gre_print_opt,
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};
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