1 /* Shared library add-on to iptables to add ESP support. */
9 #include <linux/netfilter_ipv4/ipt_esp.h>
11 /* Function which prints out usage message. */
17 " --espspi [!] spi[:spi]\n"
18 " match spi (range)\n",
22 static struct option opts
[] = {
23 { "espspi", 1, 0, '1' },
28 parse_esp_spi(const char *spistr
)
30 unsigned long int spi
;
33 spi
= strtoul(spistr
,&ep
,0) ;
36 exit_error(PARAMETER_PROBLEM
,
37 "ESP no valid digits in spi `%s'", spistr
);
39 if ( spi
== ULONG_MAX
&& errno
== ERANGE
) {
40 exit_error(PARAMETER_PROBLEM
,
41 "spi `%s' specified too big: would overflow", spistr
);
43 if ( *spistr
!= '\0' && *ep
!= '\0' ) {
44 exit_error(PARAMETER_PROBLEM
,
45 "ESP error parsing spi `%s'", spistr
);
47 return (u_int32_t
) spi
;
51 parse_esp_spis(const char *spistring
, u_int32_t
*spis
)
56 buffer
= strdup(spistring
);
57 if ((cp
= strchr(buffer
, ':')) == NULL
)
58 spis
[0] = spis
[1] = parse_esp_spi(buffer
);
63 spis
[0] = buffer
[0] ? parse_esp_spi(buffer
) : 0;
64 spis
[1] = cp
[0] ? parse_esp_spi(cp
) : 0xFFFFFFFF;
65 if (spis
[0] > spis
[1])
66 exit_error(PARAMETER_PROBLEM
,
67 "Invalid ESP spi range: %s", spistring
);
72 /* Initialize the match. */
74 init(struct ipt_entry_match
*m
, unsigned int *nfcache
)
76 struct ipt_esp
*espinfo
= (struct ipt_esp
*)m
->data
;
78 espinfo
->spis
[1] = 0xFFFFFFFF;
83 /* Function which parses command options; returns true if it
86 parse(int c
, char **argv
, int invert
, unsigned int *flags
,
87 const struct ipt_entry
*entry
,
88 unsigned int *nfcache
,
89 struct ipt_entry_match
**match
)
91 struct ipt_esp
*espinfo
= (struct ipt_esp
*)(*match
)->data
;
96 exit_error(PARAMETER_PROBLEM
,
97 "Only one `--espspi' allowed");
98 check_inverse(optarg
, &invert
, &optind
, 0);
99 parse_esp_spis(argv
[optind
-1], espinfo
->spis
);
101 espinfo
->invflags
|= IPT_ESP_INV_SPI
;
111 /* Final check; we don't care. */
113 final_check(unsigned int flags
)
118 print_spis(const char *name
, u_int32_t min
, u_int32_t max
,
121 const char *inv
= invert
? "!" : "";
123 if (min
!= 0 || max
!= 0xFFFFFFFF || invert
) {
138 /* Prints out the union ipt_matchinfo. */
140 print(const struct ipt_ip
*ip
,
141 const struct ipt_entry_match
*match
, int numeric
)
143 const struct ipt_esp
*esp
= (struct ipt_esp
*)match
->data
;
146 print_spis("spi", esp
->spis
[0], esp
->spis
[1],
147 esp
->invflags
& IPT_ESP_INV_SPI
);
148 if (esp
->invflags
& ~IPT_ESP_INV_MASK
)
149 printf("Unknown invflags: 0x%X ",
150 esp
->invflags
& ~IPT_ESP_INV_MASK
);
153 /* Saves the union ipt_matchinfo in parsable form to stdout. */
154 static void save(const struct ipt_ip
*ip
, const struct ipt_entry_match
*match
)
156 const struct ipt_esp
*espinfo
= (struct ipt_esp
*)match
->data
;
158 if (!(espinfo
->spis
[0] == 0
159 && espinfo
->spis
[1] == 0xFFFFFFFF)) {
160 printf("--espspi %s",
161 (espinfo
->invflags
& IPT_ESP_INV_SPI
) ? "! " : "");
174 static struct iptables_match esp
= {
177 .version
= IPTABLES_VERSION
,
178 .size
= IPT_ALIGN(sizeof(struct ipt_esp
)),
179 .userspacesize
= IPT_ALIGN(sizeof(struct ipt_esp
)),
183 .final_check
= &final_check
,
192 register_match(&esp
);