360 lines
9.6 KiB
C
360 lines
9.6 KiB
C
/*
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* iplink_geneve.c GENEVE device support
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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: John W. Linville <linville@tuxdriver.com>
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*/
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#include <stdio.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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#define GENEVE_ATTRSET(attrs, type) (((attrs) & (1L << (type))) != 0)
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static void print_explain(FILE *f)
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{
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fprintf(f,
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"Usage: ... geneve id VNI\n"
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" remote ADDR\n"
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" [ ttl TTL ]\n"
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" [ tos TOS ]\n"
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" [ flowlabel LABEL ]\n"
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" [ dstport PORT ]\n"
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" [ [no]external ]\n"
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" [ [no]udpcsum ]\n"
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" [ [no]udp6zerocsumtx ]\n"
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" [ [no]udp6zerocsumrx ]\n"
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"\n"
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"Where: VNI := 0-16777215\n"
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" ADDR := IP_ADDRESS\n"
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" TOS := { NUMBER | inherit }\n"
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" TTL := { 1..255 | inherit }\n"
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" LABEL := 0-1048575\n"
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);
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}
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static void explain(void)
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{
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print_explain(stderr);
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}
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static void check_duparg(__u64 *attrs, int type, const char *key,
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const char *argv)
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{
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if (!GENEVE_ATTRSET(*attrs, type)) {
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*attrs |= (1L << type);
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return;
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}
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duparg2(key, argv);
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}
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static int geneve_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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__u32 vni = 0;
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__u32 daddr = 0;
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struct in6_addr daddr6 = IN6ADDR_ANY_INIT;
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__u32 label = 0;
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__u8 ttl = 0;
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__u8 tos = 0;
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__u16 dstport = 0;
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bool metadata = 0;
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__u8 udpcsum = 0;
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__u8 udp6zerocsumtx = 0;
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__u8 udp6zerocsumrx = 0;
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__u64 attrs = 0;
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bool set_op = (n->nlmsg_type == RTM_NEWLINK &&
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!(n->nlmsg_flags & NLM_F_CREATE));
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while (argc > 0) {
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if (!matches(*argv, "id") ||
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!matches(*argv, "vni")) {
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NEXT_ARG();
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check_duparg(&attrs, IFLA_GENEVE_ID, "id", *argv);
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if (get_u32(&vni, *argv, 0) ||
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vni >= 1u << 24)
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invarg("invalid id", *argv);
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} else if (!matches(*argv, "remote")) {
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NEXT_ARG();
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check_duparg(&attrs, IFLA_GENEVE_REMOTE, "remote",
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*argv);
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if (!inet_get_addr(*argv, &daddr, &daddr6)) {
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fprintf(stderr, "Invalid address \"%s\"\n", *argv);
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return -1;
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}
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if (IN6_IS_ADDR_MULTICAST(&daddr6) || IN_MULTICAST(ntohl(daddr)))
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invarg("invalid remote address", *argv);
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} else if (!matches(*argv, "ttl") ||
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!matches(*argv, "hoplimit")) {
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unsigned int uval;
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NEXT_ARG();
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check_duparg(&attrs, IFLA_GENEVE_TTL, "ttl", *argv);
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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", *argv);
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if (uval > 255)
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invarg("TTL must be <= 255", *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, "dsfield")) {
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__u32 uval;
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NEXT_ARG();
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check_duparg(&attrs, IFLA_GENEVE_TOS, "tos", *argv);
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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 (!matches(*argv, "label") ||
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!matches(*argv, "flowlabel")) {
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__u32 uval;
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NEXT_ARG();
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check_duparg(&attrs, IFLA_GENEVE_LABEL, "flowlabel",
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*argv);
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if (get_u32(&uval, *argv, 0) ||
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(uval & ~LABEL_MAX_MASK))
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invarg("invalid flowlabel", *argv);
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label = htonl(uval);
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} else if (!matches(*argv, "dstport")) {
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NEXT_ARG();
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check_duparg(&attrs, IFLA_GENEVE_PORT, "dstport",
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*argv);
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if (get_u16(&dstport, *argv, 0))
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invarg("dstport", *argv);
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} else if (!matches(*argv, "external")) {
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check_duparg(&attrs, IFLA_GENEVE_COLLECT_METADATA,
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*argv, *argv);
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metadata = true;
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} else if (!matches(*argv, "noexternal")) {
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check_duparg(&attrs, IFLA_GENEVE_COLLECT_METADATA,
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*argv, *argv);
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metadata = false;
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} else if (!matches(*argv, "udpcsum")) {
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check_duparg(&attrs, IFLA_GENEVE_UDP_CSUM, *argv,
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*argv);
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udpcsum = 1;
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} else if (!matches(*argv, "noudpcsum")) {
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check_duparg(&attrs, IFLA_GENEVE_UDP_CSUM, *argv,
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*argv);
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udpcsum = 0;
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} else if (!matches(*argv, "udp6zerocsumtx")) {
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check_duparg(&attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
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*argv, *argv);
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udp6zerocsumtx = 1;
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} else if (!matches(*argv, "noudp6zerocsumtx")) {
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check_duparg(&attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
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*argv, *argv);
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udp6zerocsumtx = 0;
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} else if (!matches(*argv, "udp6zerocsumrx")) {
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check_duparg(&attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
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*argv, *argv);
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udp6zerocsumrx = 1;
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} else if (!matches(*argv, "noudp6zerocsumrx")) {
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check_duparg(&attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
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*argv, *argv);
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udp6zerocsumrx = 0;
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} else if (matches(*argv, "help") == 0) {
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explain();
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return -1;
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} else {
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fprintf(stderr, "geneve: unknown command \"%s\"?\n", *argv);
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explain();
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return -1;
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}
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argc--, argv++;
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}
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if (metadata && GENEVE_ATTRSET(attrs, IFLA_GENEVE_ID)) {
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fprintf(stderr, "geneve: both 'external' and vni cannot be specified\n");
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return -1;
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}
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if (!metadata) {
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/* parameter checking make sense only for full geneve tunnels */
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if (!GENEVE_ATTRSET(attrs, IFLA_GENEVE_ID)) {
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fprintf(stderr, "geneve: missing virtual network identifier\n");
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return -1;
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}
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/* If we are modifying the geneve device, then we only need the
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* ID (VNI) to identify the geneve device, and we do not need
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* the remote IP.
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*/
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if (!set_op && !daddr && IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
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fprintf(stderr, "geneve: remote link partner not specified\n");
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return -1;
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}
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}
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addattr32(n, 1024, IFLA_GENEVE_ID, vni);
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if (daddr)
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addattr_l(n, 1024, IFLA_GENEVE_REMOTE, &daddr, 4);
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if (!IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
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addattr_l(n, 1024, IFLA_GENEVE_REMOTE6, &daddr6,
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sizeof(struct in6_addr));
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}
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if (!set_op || GENEVE_ATTRSET(attrs, IFLA_GENEVE_LABEL))
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addattr32(n, 1024, IFLA_GENEVE_LABEL, label);
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if (!set_op || GENEVE_ATTRSET(attrs, IFLA_GENEVE_TTL))
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addattr8(n, 1024, IFLA_GENEVE_TTL, ttl);
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if (!set_op || GENEVE_ATTRSET(attrs, IFLA_GENEVE_TOS))
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addattr8(n, 1024, IFLA_GENEVE_TOS, tos);
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if (dstport)
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addattr16(n, 1024, IFLA_GENEVE_PORT, htons(dstport));
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if (metadata)
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addattr(n, 1024, IFLA_GENEVE_COLLECT_METADATA);
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if (GENEVE_ATTRSET(attrs, IFLA_GENEVE_UDP_CSUM))
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addattr8(n, 1024, IFLA_GENEVE_UDP_CSUM, udpcsum);
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if (GENEVE_ATTRSET(attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_TX))
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addattr8(n, 1024, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, udp6zerocsumtx);
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if (GENEVE_ATTRSET(attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_RX))
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addattr8(n, 1024, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, udp6zerocsumrx);
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return 0;
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}
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static void geneve_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
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{
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__u32 vni;
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__u8 tos;
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if (!tb)
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return;
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if (!tb[IFLA_GENEVE_ID] ||
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RTA_PAYLOAD(tb[IFLA_GENEVE_ID]) < sizeof(__u32))
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return;
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vni = rta_getattr_u32(tb[IFLA_GENEVE_ID]);
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print_uint(PRINT_ANY, "id", "id %u ", vni);
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if (tb[IFLA_GENEVE_REMOTE]) {
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__be32 addr = rta_getattr_u32(tb[IFLA_GENEVE_REMOTE]);
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if (addr)
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print_string(PRINT_ANY,
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"remote",
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"remote %s ",
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format_host(AF_INET, 4, &addr));
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} else if (tb[IFLA_GENEVE_REMOTE6]) {
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struct in6_addr addr;
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memcpy(&addr, RTA_DATA(tb[IFLA_GENEVE_REMOTE6]), sizeof(struct in6_addr));
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if (!IN6_IS_ADDR_UNSPECIFIED(&addr)) {
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if (!IN6_IS_ADDR_MULTICAST(&addr))
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print_string(PRINT_ANY,
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"remote6",
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"remote %s ",
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format_host(AF_INET6,
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sizeof(struct in6_addr),
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&addr));
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}
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}
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if (tb[IFLA_GENEVE_TTL]) {
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__u8 ttl = rta_getattr_u8(tb[IFLA_GENEVE_TTL]);
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if (ttl)
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print_int(PRINT_ANY, "ttl", "ttl %d ", ttl);
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}
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if (tb[IFLA_GENEVE_TOS] &&
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(tos = rta_getattr_u8(tb[IFLA_GENEVE_TOS]))) {
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if (is_json_context()) {
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print_0xhex(PRINT_JSON, "tos", "%#x", tos);
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} else {
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if (tos == 1) {
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print_string(PRINT_FP,
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"tos",
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"tos %s ",
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"inherit");
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} else {
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fprintf(f, "tos %#x ", tos);
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}
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}
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}
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if (tb[IFLA_GENEVE_LABEL]) {
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__u32 label = rta_getattr_u32(tb[IFLA_GENEVE_LABEL]);
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if (label)
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print_0xhex(PRINT_ANY,
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"label",
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"flowlabel %#x ",
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ntohl(label));
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}
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if (tb[IFLA_GENEVE_PORT])
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print_uint(PRINT_ANY,
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"port",
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"dstport %u ",
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rta_getattr_be16(tb[IFLA_GENEVE_PORT]));
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if (tb[IFLA_GENEVE_COLLECT_METADATA])
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print_bool(PRINT_ANY, "collect_metadata", "external ", true);
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if (tb[IFLA_GENEVE_UDP_CSUM]) {
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if (is_json_context()) {
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print_bool(PRINT_JSON,
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"udp_csum",
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NULL,
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rta_getattr_u8(tb[IFLA_GENEVE_UDP_CSUM]));
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} else {
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if (!rta_getattr_u8(tb[IFLA_GENEVE_UDP_CSUM]))
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fputs("no", f);
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fputs("udpcsum ", f);
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}
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}
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if (tb[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
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if (is_json_context()) {
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print_bool(PRINT_JSON,
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"udp_zero_csum6_tx",
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NULL,
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rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]));
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} else {
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if (!rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
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fputs("no", f);
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fputs("udp6zerocsumtx ", f);
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}
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}
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if (tb[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
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if (is_json_context()) {
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print_bool(PRINT_JSON,
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"udp_zero_csum6_rx",
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NULL,
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rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]));
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} else {
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if (!rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
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fputs("no", f);
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fputs("udp6zerocsumrx ", f);
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}
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}
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}
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static void geneve_print_help(struct link_util *lu, int argc, char **argv,
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FILE *f)
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{
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print_explain(f);
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}
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struct link_util geneve_link_util = {
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.id = "geneve",
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.maxattr = IFLA_GENEVE_MAX,
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.parse_opt = geneve_parse_opt,
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.print_opt = geneve_print_opt,
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.print_help = geneve_print_help,
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};
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