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6928747b TH |
1 | /* |
2 | * ipfou.c FOU (foo over UDP) 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: Tom Herbert <therbert@google.com> | |
10 | */ | |
11 | ||
12 | #include <netdb.h> | |
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
15 | #include <string.h> | |
16 | #include <net/if.h> | |
17 | #include <linux/fou.h> | |
18 | #include <linux/genetlink.h> | |
19 | #include <linux/ip.h> | |
20 | #include <arpa/inet.h> | |
21 | ||
22 | #include "libgenl.h" | |
23 | #include "utils.h" | |
24 | #include "ip_common.h" | |
25 | ||
26 | static void usage(void) | |
27 | { | |
8bd31d8d TH |
28 | fprintf(stderr, "Usage: ip fou add port PORT " |
29 | "{ ipproto PROTO | gue } [ -6 ]\n"); | |
30 | fprintf(stderr, " ip fou del port PORT [ -6 ]\n"); | |
6928747b TH |
31 | fprintf(stderr, "\n"); |
32 | fprintf(stderr, "Where: PROTO { ipproto-name | 1..255 }\n"); | |
33 | fprintf(stderr, " PORT { 1..65535 }\n"); | |
34 | ||
35 | exit(-1); | |
36 | } | |
37 | ||
38 | /* netlink socket */ | |
39 | static struct rtnl_handle genl_rth = { .fd = -1 }; | |
40 | static int genl_family = -1; | |
41 | ||
42 | #define FOU_REQUEST(_req, _bufsiz, _cmd, _flags) \ | |
43 | GENL_REQUEST(_req, _bufsiz, genl_family, 0, \ | |
44 | FOU_GENL_VERSION, _cmd, _flags) | |
45 | ||
46 | static int fou_parse_opt(int argc, char **argv, struct nlmsghdr *n, | |
47 | bool adding) | |
48 | { | |
49 | __u16 port; | |
50 | int port_set = 0; | |
51 | __u8 ipproto, type; | |
52 | bool gue_set = false; | |
53 | int ipproto_set = 0; | |
8bd31d8d | 54 | unsigned short family = AF_INET; |
6928747b TH |
55 | |
56 | while (argc > 0) { | |
57 | if (!matches(*argv, "port")) { | |
58 | NEXT_ARG(); | |
59 | ||
9f7401fa | 60 | if (get_be16(&port, *argv, 0) || port == 0) |
6928747b | 61 | invarg("invalid port", *argv); |
6928747b TH |
62 | port_set = 1; |
63 | } else if (!matches(*argv, "ipproto")) { | |
64 | struct protoent *servptr; | |
65 | ||
66 | NEXT_ARG(); | |
67 | ||
68 | servptr = getprotobyname(*argv); | |
69 | if (servptr) | |
70 | ipproto = servptr->p_proto; | |
71 | else if (get_u8(&ipproto, *argv, 0) || ipproto == 0) | |
72 | invarg("invalid ipproto", *argv); | |
73 | ipproto_set = 1; | |
74 | } else if (!matches(*argv, "gue")) { | |
75 | gue_set = true; | |
8bd31d8d TH |
76 | } else if (!matches(*argv, "-6")) { |
77 | family = AF_INET6; | |
6928747b TH |
78 | } else { |
79 | fprintf(stderr, "fou: unknown command \"%s\"?\n", *argv); | |
80 | usage(); | |
81 | return -1; | |
82 | } | |
83 | argc--, argv++; | |
84 | } | |
85 | ||
86 | if (!port_set) { | |
87 | fprintf(stderr, "fou: missing port\n"); | |
88 | return -1; | |
89 | } | |
90 | ||
91 | if (!ipproto_set && !gue_set && adding) { | |
92 | fprintf(stderr, "fou: must set ipproto or gue\n"); | |
93 | return -1; | |
94 | } | |
95 | ||
96 | if (ipproto_set && gue_set) { | |
97 | fprintf(stderr, "fou: cannot set ipproto and gue\n"); | |
98 | return -1; | |
99 | } | |
100 | ||
101 | type = gue_set ? FOU_ENCAP_GUE : FOU_ENCAP_DIRECT; | |
102 | ||
103 | addattr16(n, 1024, FOU_ATTR_PORT, port); | |
104 | addattr8(n, 1024, FOU_ATTR_TYPE, type); | |
8bd31d8d | 105 | addattr16(n, 1024, FOU_ATTR_AF, family); |
6928747b TH |
106 | |
107 | if (ipproto_set) | |
108 | addattr8(n, 1024, FOU_ATTR_IPPROTO, ipproto); | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | static int do_add(int argc, char **argv) | |
114 | { | |
115 | FOU_REQUEST(req, 1024, FOU_CMD_ADD, NLM_F_REQUEST); | |
116 | ||
117 | fou_parse_opt(argc, argv, &req.n, true); | |
118 | ||
86bf43c7 | 119 | if (rtnl_talk(&genl_rth, &req.n, NULL) < 0) |
6928747b TH |
120 | return -2; |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static int do_del(int argc, char **argv) | |
126 | { | |
127 | FOU_REQUEST(req, 1024, FOU_CMD_DEL, NLM_F_REQUEST); | |
128 | ||
129 | fou_parse_opt(argc, argv, &req.n, false); | |
130 | ||
86bf43c7 | 131 | if (rtnl_talk(&genl_rth, &req.n, NULL) < 0) |
6928747b TH |
132 | return -2; |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | int do_ipfou(int argc, char **argv) | |
138 | { | |
6928747b TH |
139 | if (argc < 1) |
140 | usage(); | |
141 | ||
d240a0e1 SD |
142 | if (matches(*argv, "help") == 0) |
143 | usage(); | |
144 | ||
145 | if (genl_init_handle(&genl_rth, FOU_GENL_NAME, &genl_family)) | |
146 | exit(1); | |
147 | ||
6928747b TH |
148 | if (matches(*argv, "add") == 0) |
149 | return do_add(argc-1, argv+1); | |
150 | if (matches(*argv, "delete") == 0) | |
151 | return do_del(argc-1, argv+1); | |
6928747b TH |
152 | fprintf(stderr, "Command \"%s\" is unknown, try \"ip fou help\".\n", *argv); |
153 | exit(-1); | |
154 | } |