mirror of
https://git.kernel.org/pub/scm/network/iproute2/iproute2.git
synced 2024-11-17 06:53:26 +08:00
363 lines
9.8 KiB
C
363 lines
9.8 KiB
C
/*
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* link_iptnl.c ipip and sit 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: Nicolas Dichtel <nicolas.dichtel@6wind.com>
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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 <sys/types.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <linux/ip.h>
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#include <linux/if_tunnel.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(int sit) __attribute__((noreturn));
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static void usage(int sit)
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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 { ipip | sit } [ remote ADDR ] [ local ADDR ]\n");
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fprintf(stderr, " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n");
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fprintf(stderr, " [ 6rd-prefix ADDR ] [ 6rd-relay_prefix ADDR ] [ 6rd-reset ]\n");
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if (sit) {
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fprintf(stderr, " [ mode { ip6ip | ipip | any } ]\n");
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fprintf(stderr, " [ isatap ]\n");
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}
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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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exit(-1);
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}
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static int iptunnel_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[2048];
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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 *iptuninfo[IFLA_IPTUN_MAX + 1];
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int len;
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__u32 link = 0;
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__u32 laddr = 0;
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__u32 raddr = 0;
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__u8 ttl = 0;
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__u8 tos = 0;
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__u8 pmtudisc = 1;
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__u16 iflags = 0;
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__u8 proto = 0;
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struct in6_addr ip6rdprefix;
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__u16 ip6rdprefixlen = 0;
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__u32 ip6rdrelayprefix = 0;
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__u16 ip6rdrelayprefixlen = 0;
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memset(&ip6rdprefix, 0, sizeof(ip6rdprefix));
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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) < 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(iptuninfo, IFLA_IPTUN_MAX,
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linkinfo[IFLA_INFO_DATA]);
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if (iptuninfo[IFLA_IPTUN_LOCAL])
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laddr = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LOCAL]);
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if (iptuninfo[IFLA_IPTUN_REMOTE])
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raddr = rta_getattr_u32(iptuninfo[IFLA_IPTUN_REMOTE]);
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if (iptuninfo[IFLA_IPTUN_TTL])
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ttl = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]);
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if (iptuninfo[IFLA_IPTUN_TOS])
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tos = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TOS]);
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if (iptuninfo[IFLA_IPTUN_PMTUDISC])
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pmtudisc =
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rta_getattr_u8(iptuninfo[IFLA_IPTUN_PMTUDISC]);
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if (iptuninfo[IFLA_IPTUN_FLAGS])
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iflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_FLAGS]);
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if (iptuninfo[IFLA_IPTUN_LINK])
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link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]);
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if (iptuninfo[IFLA_IPTUN_PROTO])
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proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]);
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if (iptuninfo[IFLA_IPTUN_6RD_PREFIX])
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memcpy(&ip6rdprefix,
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RTA_DATA(iptuninfo[IFLA_IPTUN_6RD_PREFIX]),
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sizeof(laddr));
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if (iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN])
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ip6rdprefixlen =
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rta_getattr_u16(iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN]);
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if (iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX])
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ip6rdrelayprefix =
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rta_getattr_u32(iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX]);
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if (iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN])
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ip6rdrelayprefixlen =
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rta_getattr_u16(iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
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}
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while (argc > 0) {
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if (strcmp(*argv, "remote") == 0) {
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NEXT_ARG();
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if (strcmp(*argv, "any"))
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raddr = get_addr32(*argv);
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else
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raddr = 0;
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} else if (strcmp(*argv, "local") == 0) {
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NEXT_ARG();
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if (strcmp(*argv, "any"))
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laddr = get_addr32(*argv);
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else
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laddr = 0;
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} else if (matches(*argv, "dev") == 0) {
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NEXT_ARG();
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link = if_nametoindex(*argv);
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if (link == 0)
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invarg("\"dev\" is invalid", *argv);
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} else if (strcmp(*argv, "ttl") == 0 ||
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strcmp(*argv, "hoplimit") == 0) {
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NEXT_ARG();
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if (strcmp(*argv, "inherit") != 0) {
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if (get_u8(&ttl, *argv, 0))
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invarg("invalid TTL\n", *argv);
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} else
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ttl = 0;
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} else if (strcmp(*argv, "tos") == 0 ||
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strcmp(*argv, "tclass") == 0 ||
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matches(*argv, "dsfield") == 0) {
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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 if (strcmp(*argv, "nopmtudisc") == 0) {
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pmtudisc = 0;
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} else if (strcmp(*argv, "pmtudisc") == 0) {
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pmtudisc = 1;
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} else if (strcmp(lu->id, "sit") == 0 &&
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strcmp(*argv, "isatap") == 0) {
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iflags |= SIT_ISATAP;
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} else if (strcmp(lu->id, "sit") == 0 &&
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strcmp(*argv, "mode") == 0) {
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NEXT_ARG();
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if (strcmp(*argv, "ipv6/ipv4") == 0 ||
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strcmp(*argv, "ip6ip") == 0)
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proto = IPPROTO_IPV6;
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else if (strcmp(*argv, "ipv4/ipv4") == 0 ||
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strcmp(*argv, "ipip") == 0 ||
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strcmp(*argv, "ip4ip4") == 0)
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proto = IPPROTO_IPIP;
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else if (strcmp(*argv, "any/ipv4") == 0 ||
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strcmp(*argv, "any") == 0)
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proto = 0;
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else
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invarg("Cannot guess tunnel mode.", *argv);
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} else if (strcmp(*argv, "6rd-prefix") == 0) {
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inet_prefix prefix;
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NEXT_ARG();
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if (get_prefix(&prefix, *argv, AF_INET6))
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invarg("invalid 6rd_prefix\n", *argv);
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memcpy(&ip6rdprefix, prefix.data, 16);
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ip6rdprefixlen = prefix.bitlen;
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} else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
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inet_prefix prefix;
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NEXT_ARG();
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if (get_prefix(&prefix, *argv, AF_INET))
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invarg("invalid 6rd-relay_prefix\n", *argv);
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memcpy(&ip6rdrelayprefix, prefix.data, 4);
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ip6rdrelayprefixlen = prefix.bitlen;
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} else if (strcmp(*argv, "6rd-reset") == 0) {
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inet_prefix prefix;
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get_prefix(&prefix, "2002::", AF_INET6);
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memcpy(&ip6rdprefix, prefix.data, 16);
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ip6rdprefixlen = 16;
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ip6rdrelayprefix = 0;
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ip6rdrelayprefixlen = 0;
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} else
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usage(strcmp(lu->id, "sit") == 0);
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argc--, argv++;
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}
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if (ttl && pmtudisc == 0) {
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fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n");
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exit(-1);
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}
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addattr32(n, 1024, IFLA_IPTUN_LINK, link);
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addattr32(n, 1024, IFLA_IPTUN_LOCAL, laddr);
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addattr32(n, 1024, IFLA_IPTUN_REMOTE, raddr);
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addattr8(n, 1024, IFLA_IPTUN_TTL, ttl);
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addattr8(n, 1024, IFLA_IPTUN_TOS, tos);
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addattr8(n, 1024, IFLA_IPTUN_PMTUDISC, pmtudisc);
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if (strcmp(lu->id, "sit") == 0) {
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addattr16(n, 1024, IFLA_IPTUN_FLAGS, iflags);
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addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
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if (ip6rdprefixlen) {
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addattr_l(n, 1024, IFLA_IPTUN_6RD_PREFIX,
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&ip6rdprefix, sizeof(ip6rdprefix));
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addattr16(n, 1024, IFLA_IPTUN_6RD_PREFIXLEN,
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ip6rdprefixlen);
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addattr32(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIX,
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ip6rdrelayprefix);
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addattr16(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
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ip6rdrelayprefixlen);
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}
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}
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return 0;
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}
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static void iptunnel_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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if (!tb)
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return;
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if (tb[IFLA_IPTUN_REMOTE]) {
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unsigned addr = rta_getattr_u32(tb[IFLA_IPTUN_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_IPTUN_LOCAL]) {
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unsigned addr = rta_getattr_u32(tb[IFLA_IPTUN_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_IPTUN_LINK] && rta_getattr_u32(tb[IFLA_IPTUN_LINK])) {
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unsigned link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]);
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const char *n = if_indextoname(link, s2);
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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_IPTUN_TTL] && rta_getattr_u8(tb[IFLA_IPTUN_TTL]))
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fprintf(f, "ttl %d ", rta_getattr_u8(tb[IFLA_IPTUN_TTL]));
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else
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fprintf(f, "ttl inherit ");
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if (tb[IFLA_IPTUN_TOS] && rta_getattr_u8(tb[IFLA_IPTUN_TOS])) {
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int tos = rta_getattr_u8(tb[IFLA_IPTUN_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_IPTUN_PMTUDISC] && rta_getattr_u8(tb[IFLA_IPTUN_PMTUDISC]))
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fprintf(f, "pmtudisc ");
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else
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fprintf(f, "nopmtudisc ");
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if (tb[IFLA_IPTUN_FLAGS]) {
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__u16 iflags = rta_getattr_u16(tb[IFLA_IPTUN_FLAGS]);
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if (iflags & SIT_ISATAP)
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fprintf(f, "isatap ");
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}
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if (tb[IFLA_IPTUN_6RD_PREFIXLEN] &&
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*(__u16 *)RTA_DATA(tb[IFLA_IPTUN_6RD_PREFIXLEN])) {
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__u16 prefixlen = rta_getattr_u16(tb[IFLA_IPTUN_6RD_PREFIXLEN]);
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__u16 relayprefixlen =
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rta_getattr_u16(tb[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
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__u32 relayprefix =
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rta_getattr_u32(tb[IFLA_IPTUN_6RD_RELAY_PREFIX]);
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printf("6rd-prefix %s/%u ",
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inet_ntop(AF_INET6, RTA_DATA(tb[IFLA_IPTUN_6RD_PREFIX]),
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s1, sizeof(s1)),
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prefixlen);
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if (relayprefix) {
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printf("6rd-relay_prefix %s/%u ",
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format_host(AF_INET, 4, &relayprefix, s1,
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sizeof(s1)),
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relayprefixlen);
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}
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}
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}
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struct link_util ipip_link_util = {
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.id = "ipip",
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.maxattr = IFLA_IPTUN_MAX,
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.parse_opt = iptunnel_parse_opt,
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.print_opt = iptunnel_print_opt,
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};
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struct link_util sit_link_util = {
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.id = "sit",
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.maxattr = IFLA_IPTUN_MAX,
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.parse_opt = iptunnel_parse_opt,
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.print_opt = iptunnel_print_opt,
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};
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