Lines Matching defs:*
0 #include <stdint.h>
2 #include <stdio.h>
3 #include <netdb.h>
4 #include <arpa/inet.h>
5 #include <xtables.h>
6 #include <linux/netfilter/xt_tcpudp.h>
8 enum {
9 O_SOURCE_PORT = 0,
10 O_DEST_PORT,
13 static void udp_help(void)
15 printf(
16 "udp match options:\n"
17 "[!] --source-port port[:port]\n"
18 " --sport ...\n"
19 " match source port(s)\n"
20 "[!] --destination-port port[:port]\n"
21 " --dport ...\n"
22 " match destination port(s)\n");
25 #define s struct xt_udp
26 static const struct xt_option_entry udp_opts[] = {
27 {.name = "source-port", .id = O_SOURCE_PORT, .type = XTTYPE_PORTRC,
28 .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, spts)},
29 {.name = "sport", .id = O_SOURCE_PORT, .type = XTTYPE_PORTRC,
30 .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, spts)},
31 {.name = "destination-port", .id = O_DEST_PORT, .type = XTTYPE_PORTRC,
32 .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, dpts)},
33 {.name = "dport", .id = O_DEST_PORT, .type = XTTYPE_PORTRC,
34 .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, dpts)},
35 XTOPT_TABLEEND,
37 #undef s
39 static void udp_init(struct xt_entry_match *m)
41 struct xt_udp *udpinfo = (struct xt_udp *)m->data;
43 udpinfo->spts[1] = udpinfo->dpts[1] = 0xFFFF;
46 static void udp_parse(struct xt_option_call *cb)
48 struct xt_udp *udpinfo = cb->data;
50 xtables_option_parse(cb);
51 switch (cb->entry->id) {
52 case O_SOURCE_PORT:
53 if (cb->invert)
54 udpinfo->invflags |= XT_UDP_INV_SRCPT;
55 break;
56 case O_DEST_PORT:
57 if (cb->invert)
58 udpinfo->invflags |= XT_UDP_INV_DSTPT;
59 break;
63 static const char *
64 port_to_service(int port)
66 const struct servent *service;
68 if ((service = getservbyport(htons(port), "udp")))
69 return service->s_name;
71 return NULL;
74 static void
75 print_port(uint16_t port, int numeric)
77 const char *service;
79 if (numeric || (service = port_to_service(port)) == NULL)
80 printf("%u", port);
81 else
82 printf("%s", service);
85 static void
86 print_ports(const char *name, uint16_t min, uint16_t max,
87 int invert, int numeric)
89 const char *inv = invert ? "!" : "";
91 if (min != 0 || max != 0xFFFF || invert) {
92 printf(" %s", name);
93 if (min == max) {
94 printf(":%s", inv);
95 print_port(min, numeric);
96 } else {
97 printf("s:%s", inv);
98 print_port(min, numeric);
99 printf(":");
100 print_port(max, numeric);
105 static void
106 udp_print(const void *ip, const struct xt_entry_match *match, int numeric)
108 const struct xt_udp *udp = (struct xt_udp *)match->data;
110 printf(" udp");
111 print_ports("spt", udp->spts[0], udp->spts[1],
112 udp->invflags & XT_UDP_INV_SRCPT,
113 numeric);
114 print_ports("dpt", udp->dpts[0], udp->dpts[1],
115 udp->invflags & XT_UDP_INV_DSTPT,
116 numeric);
117 if (udp->invflags & ~XT_UDP_INV_MASK)
118 printf(" Unknown invflags: 0x%X",
119 udp->invflags & ~XT_UDP_INV_MASK);
122 static void udp_save(const void *ip, const struct xt_entry_match *match)
124 const struct xt_udp *udpinfo = (struct xt_udp *)match->data;
126 if (udpinfo->spts[0] != 0
127 || udpinfo->spts[1] != 0xFFFF) {
128 if (udpinfo->invflags & XT_UDP_INV_SRCPT)
129 printf(" !");
130 if (udpinfo->spts[0]
131 != udpinfo->spts[1])
132 printf(" --sport %u:%u",
133 udpinfo->spts[0],
134 udpinfo->spts[1]);
135 else
136 printf(" --sport %u",
137 udpinfo->spts[0]);
140 if (udpinfo->dpts[0] != 0
141 || udpinfo->dpts[1] != 0xFFFF) {
142 if (udpinfo->invflags & XT_UDP_INV_DSTPT)
143 printf(" !");
144 if (udpinfo->dpts[0]
145 != udpinfo->dpts[1])
146 printf(" --dport %u:%u",
147 udpinfo->dpts[0],
148 udpinfo->dpts[1]);
149 else
150 printf(" --dport %u",
151 udpinfo->dpts[0]);
155 static struct xtables_match udp_match = {
156 .family = NFPROTO_UNSPEC,
157 .name = "udp",
158 .version = XTABLES_VERSION,
159 .size = XT_ALIGN(sizeof(struct xt_udp)),
160 .userspacesize = XT_ALIGN(sizeof(struct xt_udp)),
161 .help = udp_help,
162 .init = udp_init,
163 .print = udp_print,
164 .save = udp_save,
165 .x6_parse = udp_parse,
166 .x6_options = udp_opts,
169 void
170 _init(void)
172 xtables_register_match(&udp_match);