1 /*
2 * iplink_geneve.c GENEVE device support
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: John W. Linville <linville@tuxdriver.com>
10 */
11
12 #include <stdio.h>
13
14 #include "rt_names.h"
15 #include "utils.h"
16 #include "ip_common.h"
17
print_explain(FILE * f)18 static void print_explain(FILE *f)
19 {
20 fprintf(f, "Usage: ... geneve id VNI remote ADDR\n");
21 fprintf(f, " [ ttl TTL ] [ tos TOS ]\n");
22 fprintf(f, "\n");
23 fprintf(f, "Where: VNI := 0-16777215\n");
24 fprintf(f, " ADDR := IP_ADDRESS\n");
25 fprintf(f, " TOS := { NUMBER | inherit }\n");
26 fprintf(f, " TTL := { 1..255 | inherit }\n");
27 }
28
explain(void)29 static void explain(void)
30 {
31 print_explain(stderr);
32 }
33
geneve_parse_opt(struct link_util * lu,int argc,char ** argv,struct nlmsghdr * n)34 static int geneve_parse_opt(struct link_util *lu, int argc, char **argv,
35 struct nlmsghdr *n)
36 {
37 __u32 vni = 0;
38 int vni_set = 0;
39 __u32 daddr = 0;
40 struct in6_addr daddr6 = IN6ADDR_ANY_INIT;
41 __u8 ttl = 0;
42 __u8 tos = 0;
43
44 while (argc > 0) {
45 if (!matches(*argv, "id") ||
46 !matches(*argv, "vni")) {
47 NEXT_ARG();
48 if (get_u32(&vni, *argv, 0) ||
49 vni >= 1u << 24)
50 invarg("invalid id", *argv);
51 vni_set = 1;
52 } else if (!matches(*argv, "remote")) {
53 NEXT_ARG();
54 if (!inet_get_addr(*argv, &daddr, &daddr6)) {
55 fprintf(stderr, "Invalid address \"%s\"\n", *argv);
56 return -1;
57 }
58 if (IN6_IS_ADDR_MULTICAST(&daddr6) || IN_MULTICAST(ntohl(daddr)))
59 invarg("invalid remote address", *argv);
60 } else if (!matches(*argv, "ttl") ||
61 !matches(*argv, "hoplimit")) {
62 unsigned uval;
63
64 NEXT_ARG();
65 if (strcmp(*argv, "inherit") != 0) {
66 if (get_unsigned(&uval, *argv, 0))
67 invarg("invalid TTL", *argv);
68 if (uval > 255)
69 invarg("TTL must be <= 255", *argv);
70 ttl = uval;
71 }
72 } else if (!matches(*argv, "tos") ||
73 !matches(*argv, "dsfield")) {
74 __u32 uval;
75
76 NEXT_ARG();
77 if (strcmp(*argv, "inherit") != 0) {
78 if (rtnl_dsfield_a2n(&uval, *argv))
79 invarg("bad TOS value", *argv);
80 tos = uval;
81 } else
82 tos = 1;
83 } else if (matches(*argv, "help") == 0) {
84 explain();
85 return -1;
86 } else {
87 fprintf(stderr, "geneve: unknown command \"%s\"?\n", *argv);
88 explain();
89 return -1;
90 }
91 argc--, argv++;
92 }
93
94 if (!vni_set) {
95 fprintf(stderr, "geneve: missing virtual network identifier\n");
96 return -1;
97 }
98
99 if (!daddr && memcmp(&daddr6, &in6addr_any, sizeof(daddr6)) == 0) {
100 fprintf(stderr, "geneve: remote link partner not specified\n");
101 return -1;
102 }
103
104 addattr32(n, 1024, IFLA_GENEVE_ID, vni);
105 if (daddr)
106 addattr_l(n, 1024, IFLA_GENEVE_REMOTE, &daddr, 4);
107 if (memcmp(&daddr6, &in6addr_any, sizeof(daddr6)) != 0)
108 addattr_l(n, 1024, IFLA_GENEVE_REMOTE6, &daddr6, sizeof(struct in6_addr));
109 addattr8(n, 1024, IFLA_GENEVE_TTL, ttl);
110 addattr8(n, 1024, IFLA_GENEVE_TOS, tos);
111
112 return 0;
113 }
114
geneve_print_opt(struct link_util * lu,FILE * f,struct rtattr * tb[])115 static void geneve_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
116 {
117 __u32 vni;
118 char s1[1024];
119 __u8 tos;
120
121 if (!tb)
122 return;
123
124 if (!tb[IFLA_GENEVE_ID] ||
125 RTA_PAYLOAD(tb[IFLA_GENEVE_ID]) < sizeof(__u32))
126 return;
127
128 vni = rta_getattr_u32(tb[IFLA_GENEVE_ID]);
129 fprintf(f, "id %u ", vni);
130
131 if (tb[IFLA_GENEVE_REMOTE]) {
132 __be32 addr = rta_getattr_u32(tb[IFLA_GENEVE_REMOTE]);
133 if (addr)
134 fprintf(f, "remote %s ",
135 format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
136 } else if (tb[IFLA_GENEVE_REMOTE6]) {
137 struct in6_addr addr;
138 memcpy(&addr, RTA_DATA(tb[IFLA_GENEVE_REMOTE6]), sizeof(struct in6_addr));
139 if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0) {
140 if (IN6_IS_ADDR_MULTICAST(&addr))
141 fprintf(f, "remote %s ",
142 format_host(AF_INET6, sizeof(struct in6_addr), &addr, s1, sizeof(s1)));
143 }
144 }
145
146 if (tb[IFLA_GENEVE_TTL]) {
147 __u8 ttl = rta_getattr_u8(tb[IFLA_GENEVE_TTL]);
148 if (ttl)
149 fprintf(f, "ttl %d ", ttl);
150 }
151
152 if (tb[IFLA_GENEVE_TOS] &&
153 (tos = rta_getattr_u8(tb[IFLA_GENEVE_TOS]))) {
154 if (tos == 1)
155 fprintf(f, "tos inherit ");
156 else
157 fprintf(f, "tos %#x ", tos);
158 }
159 }
160
geneve_print_help(struct link_util * lu,int argc,char ** argv,FILE * f)161 static void geneve_print_help(struct link_util *lu, int argc, char **argv,
162 FILE *f)
163 {
164 print_explain(f);
165 }
166
167 struct link_util geneve_link_util = {
168 .id = "geneve",
169 .maxattr = IFLA_GENEVE_MAX,
170 .parse_opt = geneve_parse_opt,
171 .print_opt = geneve_print_opt,
172 .print_help = geneve_print_help,
173 };
174