1
2
3#include <stdio.h>
4#include <linux/if_ether.h>
5#include <linux/if_link.h>
6#include <linux/netlink.h>
7#include <linux/rtnetlink.h>
8
9#include "libnetlink.h"
10#include "rt_names.h"
11#include "utils.h"
12#include "ip_common.h"
13#include "json_print.h"
14
15#define BAREUDP_ATTRSET(attrs, type) (((attrs) & (1L << (type))) != 0)
16
17static void print_explain(FILE *f)
18{
19 fprintf(f,
20 "Usage: ... bareudp dstport PORT\n"
21 " ethertype PROTO\n"
22 " [ srcportmin PORT ]\n"
23 " [ [no]multiproto ]\n"
24 "\n"
25 "Where: PORT := UDP_PORT\n"
26 " PROTO := ETHERTYPE\n"
27 "\n"
28 "Note: ETHERTYPE can be given as number or as protocol name (\"ipv4\", \"ipv6\",\n"
29 " \"mpls_uc\", etc.).\n"
30 );
31}
32
33static void explain(void)
34{
35 print_explain(stderr);
36}
37
38static void check_duparg(__u64 *attrs, int type, const char *key,
39 const char *argv)
40{
41 if (!BAREUDP_ATTRSET(*attrs, type)) {
42 *attrs |= (1L << type);
43 return;
44 }
45 duparg2(key, argv);
46}
47
48static int bareudp_parse_opt(struct link_util *lu, int argc, char **argv,
49 struct nlmsghdr *n)
50{
51 bool multiproto = false;
52 __u16 srcportmin = 0;
53 __be16 ethertype = 0;
54 __be16 dstport = 0;
55 __u64 attrs = 0;
56
57 while (argc > 0) {
58 if (matches(*argv, "dstport") == 0) {
59 NEXT_ARG();
60 check_duparg(&attrs, IFLA_BAREUDP_PORT, "dstport",
61 *argv);
62 if (get_be16(&dstport, *argv, 0))
63 invarg("dstport", *argv);
64 } else if (matches(*argv, "ethertype") == 0) {
65 NEXT_ARG();
66 check_duparg(&attrs, IFLA_BAREUDP_ETHERTYPE,
67 "ethertype", *argv);
68 if (ll_proto_a2n(ðertype, *argv))
69 invarg("ethertype", *argv);
70 } else if (matches(*argv, "srcportmin") == 0) {
71 NEXT_ARG();
72 check_duparg(&attrs, IFLA_BAREUDP_SRCPORT_MIN,
73 "srcportmin", *argv);
74 if (get_u16(&srcportmin, *argv, 0))
75 invarg("srcportmin", *argv);
76 } else if (matches(*argv, "multiproto") == 0) {
77 check_duparg(&attrs, IFLA_BAREUDP_MULTIPROTO_MODE,
78 *argv, *argv);
79 multiproto = true;
80 } else if (matches(*argv, "nomultiproto") == 0) {
81 check_duparg(&attrs, IFLA_BAREUDP_MULTIPROTO_MODE,
82 *argv, *argv);
83 multiproto = false;
84 } else if (matches(*argv, "help") == 0) {
85 explain();
86 return -1;
87 } else {
88 fprintf(stderr, "bareudp: unknown command \"%s\"?\n",
89 *argv);
90 explain();
91 return -1;
92 }
93 argc--, argv++;
94 }
95
96 if (!BAREUDP_ATTRSET(attrs, IFLA_BAREUDP_PORT))
97 missarg("dstport");
98 if (!BAREUDP_ATTRSET(attrs, IFLA_BAREUDP_ETHERTYPE))
99 missarg("ethertype");
100
101 addattr16(n, 1024, IFLA_BAREUDP_PORT, dstport);
102 addattr16(n, 1024, IFLA_BAREUDP_ETHERTYPE, ethertype);
103 if (BAREUDP_ATTRSET(attrs, IFLA_BAREUDP_SRCPORT_MIN))
104 addattr16(n, 1024, IFLA_BAREUDP_SRCPORT_MIN, srcportmin);
105 if (multiproto)
106 addattr(n, 1024, IFLA_BAREUDP_MULTIPROTO_MODE);
107
108 return 0;
109}
110
111static void bareudp_print_opt(struct link_util *lu, FILE *f,
112 struct rtattr *tb[])
113{
114 if (!tb)
115 return;
116
117 if (tb[IFLA_BAREUDP_PORT])
118 print_uint(PRINT_ANY, "dstport", "dstport %u ",
119 rta_getattr_be16(tb[IFLA_BAREUDP_PORT]));
120
121 if (tb[IFLA_BAREUDP_ETHERTYPE]) {
122 struct rtattr *attr = tb[IFLA_BAREUDP_ETHERTYPE];
123 SPRINT_BUF(ethertype);
124
125 print_string(PRINT_ANY, "ethertype", "ethertype %s ",
126 ll_proto_n2a(rta_getattr_u16(attr),
127 ethertype, sizeof(ethertype)));
128 }
129
130 if (tb[IFLA_BAREUDP_SRCPORT_MIN])
131 print_uint(PRINT_ANY, "srcportmin", "srcportmin %u ",
132 rta_getattr_u16(tb[IFLA_BAREUDP_SRCPORT_MIN]));
133
134 if (tb[IFLA_BAREUDP_MULTIPROTO_MODE])
135 print_bool(PRINT_ANY, "multiproto", "multiproto ", true);
136 else
137 print_bool(PRINT_ANY, "multiproto", "nomultiproto ", false);
138}
139
140static void bareudp_print_help(struct link_util *lu, int argc, char **argv,
141 FILE *f)
142{
143 print_explain(f);
144}
145
146struct link_util bareudp_link_util = {
147 .id = "bareudp",
148 .maxattr = IFLA_BAREUDP_MAX,
149 .parse_opt = bareudp_parse_opt,
150 .print_opt = bareudp_print_opt,
151 .print_help = bareudp_print_help,
152};
153
