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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 | { | |
28 | fprintf(stderr, "Usage: ip fou add port PORT { ipproto PROTO | gue }\n"); | |
29 | fprintf(stderr, " ip fou del port PORT\n"); | |
30 | fprintf(stderr, "\n"); | |
31 | fprintf(stderr, "Where: PROTO { ipproto-name | 1..255 }\n"); | |
32 | fprintf(stderr, " PORT { 1..65535 }\n"); | |
33 | ||
34 | exit(-1); | |
35 | } | |
36 | ||
37 | /* netlink socket */ | |
38 | static struct rtnl_handle genl_rth = { .fd = -1 }; | |
39 | static int genl_family = -1; | |
40 | ||
41 | #define FOU_REQUEST(_req, _bufsiz, _cmd, _flags) \ | |
42 | GENL_REQUEST(_req, _bufsiz, genl_family, 0, \ | |
43 | FOU_GENL_VERSION, _cmd, _flags) | |
44 | ||
45 | static int fou_parse_opt(int argc, char **argv, struct nlmsghdr *n, | |
46 | bool adding) | |
47 | { | |
48 | __u16 port; | |
49 | int port_set = 0; | |
50 | __u8 ipproto, type; | |
51 | bool gue_set = false; | |
52 | int ipproto_set = 0; | |
53 | ||
54 | while (argc > 0) { | |
55 | if (!matches(*argv, "port")) { | |
56 | NEXT_ARG(); | |
57 | ||
9f7401fa | 58 | if (get_be16(&port, *argv, 0) || port == 0) |
6928747b | 59 | invarg("invalid port", *argv); |
6928747b TH |
60 | port_set = 1; |
61 | } else if (!matches(*argv, "ipproto")) { | |
62 | struct protoent *servptr; | |
63 | ||
64 | NEXT_ARG(); | |
65 | ||
66 | servptr = getprotobyname(*argv); | |
67 | if (servptr) | |
68 | ipproto = servptr->p_proto; | |
69 | else if (get_u8(&ipproto, *argv, 0) || ipproto == 0) | |
70 | invarg("invalid ipproto", *argv); | |
71 | ipproto_set = 1; | |
72 | } else if (!matches(*argv, "gue")) { | |
73 | gue_set = true; | |
74 | } else { | |
75 | fprintf(stderr, "fou: unknown command \"%s\"?\n", *argv); | |
76 | usage(); | |
77 | return -1; | |
78 | } | |
79 | argc--, argv++; | |
80 | } | |
81 | ||
82 | if (!port_set) { | |
83 | fprintf(stderr, "fou: missing port\n"); | |
84 | return -1; | |
85 | } | |
86 | ||
87 | if (!ipproto_set && !gue_set && adding) { | |
88 | fprintf(stderr, "fou: must set ipproto or gue\n"); | |
89 | return -1; | |
90 | } | |
91 | ||
92 | if (ipproto_set && gue_set) { | |
93 | fprintf(stderr, "fou: cannot set ipproto and gue\n"); | |
94 | return -1; | |
95 | } | |
96 | ||
97 | type = gue_set ? FOU_ENCAP_GUE : FOU_ENCAP_DIRECT; | |
98 | ||
99 | addattr16(n, 1024, FOU_ATTR_PORT, port); | |
100 | addattr8(n, 1024, FOU_ATTR_TYPE, type); | |
101 | ||
102 | if (ipproto_set) | |
103 | addattr8(n, 1024, FOU_ATTR_IPPROTO, ipproto); | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | static int do_add(int argc, char **argv) | |
109 | { | |
110 | FOU_REQUEST(req, 1024, FOU_CMD_ADD, NLM_F_REQUEST); | |
111 | ||
112 | fou_parse_opt(argc, argv, &req.n, true); | |
113 | ||
c079e121 | 114 | if (rtnl_talk(&genl_rth, &req.n, NULL, 0) < 0) |
6928747b TH |
115 | return -2; |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
120 | static int do_del(int argc, char **argv) | |
121 | { | |
122 | FOU_REQUEST(req, 1024, FOU_CMD_DEL, NLM_F_REQUEST); | |
123 | ||
124 | fou_parse_opt(argc, argv, &req.n, false); | |
125 | ||
c079e121 | 126 | if (rtnl_talk(&genl_rth, &req.n, NULL, 0) < 0) |
6928747b TH |
127 | return -2; |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | int do_ipfou(int argc, char **argv) | |
133 | { | |
134 | if (genl_family < 0) { | |
135 | if (rtnl_open_byproto(&genl_rth, 0, NETLINK_GENERIC) < 0) { | |
136 | fprintf(stderr, "Cannot open generic netlink socket\n"); | |
137 | exit(1); | |
138 | } | |
139 | ||
140 | genl_family = genl_resolve_family(&genl_rth, FOU_GENL_NAME); | |
141 | if (genl_family < 0) | |
142 | exit(1); | |
143 | } | |
144 | ||
145 | if (argc < 1) | |
146 | usage(); | |
147 | ||
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); | |
152 | if (matches(*argv, "help") == 0) | |
153 | usage(); | |
154 | ||
155 | fprintf(stderr, "Command \"%s\" is unknown, try \"ip fou help\".\n", *argv); | |
156 | exit(-1); | |
157 | } |