1#include <stdio.h>
2#include <xtables.h>
3#include <linux/netfilter/xt_ipcomp.h>
4
5enum {
6	O_compSPI = 0,
7	O_compRES,
8};
9
10static void comp_help(void)
11{
12	printf(
13"comp match options:\n"
14"[!] --ipcompspi spi[:spi]\n"
15"				match spi (range)\n");
16}
17
18static const struct xt_option_entry comp_opts[] = {
19	{.name = "ipcompspi", .id = O_compSPI, .type = XTTYPE_UINT32RC,
20	 .flags = XTOPT_INVERT | XTOPT_PUT,
21	 XTOPT_POINTER(struct xt_ipcomp, spis)},
22	{.name = "compres", .id = O_compRES, .type = XTTYPE_NONE},
23	XTOPT_TABLEEND,
24};
25#undef s
26
27static void comp_parse(struct xt_option_call *cb)
28{
29	struct xt_ipcomp *compinfo = cb->data;
30
31	xtables_option_parse(cb);
32	switch (cb->entry->id) {
33	case O_compSPI:
34		if (cb->nvals == 1)
35			compinfo->spis[1] = compinfo->spis[0];
36		if (cb->invert)
37			compinfo->invflags |= XT_IPCOMP_INV_SPI;
38		break;
39	case O_compRES:
40		compinfo->hdrres = 1;
41		break;
42	}
43}
44
45static void
46print_spis(const char *name, uint32_t min, uint32_t max,
47	    int invert)
48{
49	const char *inv = invert ? "!" : "";
50
51	if (min != 0 || max != 0xFFFFFFFF || invert) {
52		if (min == max)
53			printf("%s:%s%u", name, inv, min);
54		else
55			printf("%ss:%s%u:%u", name, inv, min, max);
56	}
57}
58
59static void comp_print(const void *ip, const struct xt_entry_match *match,
60                     int numeric)
61{
62	const struct xt_ipcomp *comp = (struct xt_ipcomp *)match->data;
63
64	printf(" comp ");
65	print_spis("spi", comp->spis[0], comp->spis[1],
66		    comp->invflags & XT_IPCOMP_INV_SPI);
67
68	if (comp->hdrres)
69		printf(" reserved");
70
71	if (comp->invflags & ~XT_IPCOMP_INV_MASK)
72		printf(" Unknown invflags: 0x%X",
73		       comp->invflags & ~XT_IPCOMP_INV_MASK);
74}
75
76static void comp_save(const void *ip, const struct xt_entry_match *match)
77{
78	const struct xt_ipcomp *compinfo = (struct xt_ipcomp *)match->data;
79
80	if (!(compinfo->spis[0] == 0
81	    && compinfo->spis[1] == 0xFFFFFFFF)) {
82		printf("%s --ipcompspi ",
83			(compinfo->invflags & XT_IPCOMP_INV_SPI) ? " !" : "");
84		if (compinfo->spis[0]
85		    != compinfo->spis[1])
86			printf("%u:%u",
87			       compinfo->spis[0],
88			       compinfo->spis[1]);
89		else
90			printf("%u",
91			       compinfo->spis[0]);
92	}
93
94	if (compinfo->hdrres != 0 )
95		printf(" --compres");
96}
97
98static int comp_xlate(struct xt_xlate *xl,
99		      const struct xt_xlate_mt_params *params)
100{
101	const struct xt_ipcomp *compinfo =
102		(struct xt_ipcomp *)params->match->data;
103
104	xt_xlate_add(xl, "comp cpi %s",
105		     compinfo->invflags & XT_IPCOMP_INV_SPI ? "!= " : "");
106	if (compinfo->spis[0] != compinfo->spis[1])
107		xt_xlate_add(xl, "%u-%u", compinfo->spis[0],
108			     compinfo->spis[1]);
109	else
110		xt_xlate_add(xl, "%u", compinfo->spis[0]);
111
112	return 1;
113}
114
115static struct xtables_match comp_mt_reg = {
116	.name          = "ipcomp",
117	.version       = XTABLES_VERSION,
118	.family        = NFPROTO_UNSPEC,
119	.size          = XT_ALIGN(sizeof(struct xt_ipcomp)),
120	.userspacesize = XT_ALIGN(sizeof(struct xt_ipcomp)),
121	.help          = comp_help,
122	.print         = comp_print,
123	.save          = comp_save,
124	.x6_parse      = comp_parse,
125	.x6_options    = comp_opts,
126	.xlate         = comp_xlate,
127};
128
129void
130_init(void)
131{
132	xtables_register_match(&comp_mt_reg);
133};
134
135