/* SPDX-License-Identifier: LGPL-2.1-or-later */
/***
Copyright © 2014-2015 Intel Corporation. All rights reserved.
***/
#include "nm-sd-adapt-core.h"
#include <errno.h>
#include <netinet/in.h>
#include "sd-dhcp6-client.h"
#include "alloc-util.h"
#include "dhcp-identifier.h"
#include "dhcp6-internal.h"
#include "dhcp6-lease-internal.h"
#include "dhcp6-protocol.h"
#include "dns-domain.h"
#include "memory-util.h"
#include "sparse-endian.h"
#include "strv.h"
#include "unaligned.h"
typedef struct DHCP6StatusOption {
struct DHCP6Option option;
be16_t status;
char msg[];
} _packed_ DHCP6StatusOption;
typedef struct DHCP6AddressOption {
struct DHCP6Option option;
struct iaaddr iaaddr;
uint8_t options[];
} _packed_ DHCP6AddressOption;
typedef struct DHCP6PDPrefixOption {
struct DHCP6Option option;
struct iapdprefix iapdprefix;
uint8_t options[];
} _packed_ DHCP6PDPrefixOption;
#define DHCP6_OPTION_IA_NA_LEN (sizeof(struct ia_na))
#define DHCP6_OPTION_IA_PD_LEN (sizeof(struct ia_pd))
#define DHCP6_OPTION_IA_TA_LEN (sizeof(struct ia_ta))
static int option_append_hdr(uint8_t **buf, size_t *buflen, uint16_t optcode, size_t optlen) {
DHCP6Option *option;
assert_return(buf, -EINVAL);
assert_return(*buf, -EINVAL);
assert_return(buflen, -EINVAL);
option = (DHCP6Option*) *buf;
if (optlen > 0xffff || *buflen < optlen + offsetof(DHCP6Option, data))
return -ENOBUFS;
option->code = htobe16(optcode);
option->len = htobe16(optlen);
*buf += offsetof(DHCP6Option, data);
*buflen -= offsetof(DHCP6Option, data);
return 0;
}
int dhcp6_option_append(uint8_t **buf, size_t *buflen, uint16_t code,
size_t optlen, const void *optval) {
int r;
assert_return(optval || optlen == 0, -EINVAL);
r = option_append_hdr(buf, buflen, code, optlen);
if (r < 0)
return r;
memcpy_safe(*buf, optval, optlen);
*buf += optlen;
*buflen -= optlen;
return 0;
}
int dhcp6_option_append_vendor_option(uint8_t **buf, size_t *buflen, OrderedHashmap *vendor_options) {
sd_dhcp6_option *options;
int r;
assert(buf);
assert(*buf);
assert(buflen);
assert(vendor_options);
ORDERED_HASHMAP_FOREACH(options, vendor_options) {
_cleanup_free_ uint8_t *p = NULL;
size_t total;
total = 4 + 2 + 2 + options->length;
p = malloc(total);
if (!p)
return -ENOMEM;
unaligned_write_be32(p, options->enterprise_identifier);
unaligned_write_be16(p + 4, options->option);
unaligned_write_be16(p + 6, options->length);
memcpy(p + 8, options->data, options->length);
r = dhcp6_option_append(buf, buflen, SD_DHCP6_OPTION_VENDOR_OPTS, total, p);
if (r < 0)
return r;
}
return 0;
}
int dhcp6_option_append_ia(uint8_t **buf, size_t *buflen, const DHCP6IA *ia) {
size_t ia_buflen, ia_addrlen = 0;
struct ia_na ia_na;
struct ia_ta ia_ta;
DHCP6Address *addr;
uint8_t *ia_hdr;
uint16_t len;
void *p;
int r;
assert_return(buf, -EINVAL);
assert_return(*buf, -EINVAL);
assert_return(buflen, -EINVAL);
assert_return(ia, -EINVAL);
/* client should not send set T1 and T2. See, RFC 8415, and issue #18090. */
switch (ia->type) {
case SD_DHCP6_OPTION_IA_NA:
len = DHCP6_OPTION_IA_NA_LEN;
ia_na = (struct ia_na) {
.id = ia->ia_na.id,
};
p = &ia_na;
break;
case SD_DHCP6_OPTION_IA_TA:
len = DHCP6_OPTION_IA_TA_LEN;
ia_ta = (struct ia_ta) {
.id = ia->ia_ta.id,
};
p = &ia_ta;
break;
default:
return -EINVAL;
}
if (*buflen < offsetof(DHCP6Option, data) + len)
return -ENOBUFS;
ia_hdr = *buf;
ia_buflen = *buflen;
*buf += offsetof(DHCP6Option, data);
*buflen -= offsetof(DHCP6Option, data);
memcpy(*buf, p, len);
*buf += len;
*buflen -= len;
LIST_FOREACH(addresses, addr, ia->addresses) {
struct iaaddr a = {
.address = addr->iaaddr.address,
};
r = option_append_hdr(buf, buflen, SD_DHCP6_OPTION_IAADDR, sizeof(struct iaaddr));
if (r < 0)
return r;
memcpy(*buf, &a, sizeof(struct iaaddr));
*buf += sizeof(struct iaaddr);
*buflen -= sizeof(struct iaaddr);
ia_addrlen += offsetof(DHCP6Option, data) + sizeof(struct iaaddr);
}
return option_append_hdr(&ia_hdr, &ia_buflen, ia->type, len + ia_addrlen);
}
static int option_append_pd_prefix(uint8_t **buf, size_t *buflen, const DHCP6Address *prefix) {
struct iapdprefix p;
int r;
assert(buf);
assert(*buf);
assert(buflen);
assert(prefix);
if (prefix->iapdprefix.prefixlen == 0)
return -EINVAL;
/* Do not append T1 and T2. */
p = (struct iapdprefix) {
.prefixlen = prefix->iapdprefix.prefixlen,
.address = prefix->iapdprefix.address,
};
r = option_append_hdr(buf, buflen, SD_DHCP6_OPTION_IA_PD_PREFIX, sizeof(struct iapdprefix));
if (r < 0)
return r;
memcpy(*buf, &p, sizeof(struct iapdprefix));
*buf += sizeof(struct iapdprefix);
*buflen -= sizeof(struct iapdprefix);
return offsetof(DHCP6Option, data) + sizeof(struct iapdprefix);
}
int dhcp6_option_append_pd(uint8_t **buf, size_t *buflen, const DHCP6IA *pd, const DHCP6Address *hint_pd_prefix) {
struct ia_pd ia_pd;
size_t len, pd_buflen;
uint8_t *pd_hdr;
int r;
assert_return(buf, -EINVAL);
assert_return(*buf, -EINVAL);
assert_return(buflen, -EINVAL);
assert_return(pd, -EINVAL);
assert_return(pd->type == SD_DHCP6_OPTION_IA_PD, -EINVAL);
/* Do not set T1 and T2. */
ia_pd = (struct ia_pd) {
.id = pd->ia_pd.id,
};
len = sizeof(struct ia_pd);
if (*buflen < offsetof(DHCP6Option, data) + len)
return -ENOBUFS;
pd_hdr = *buf;
pd_buflen = *buflen;
/* The header will be written at the end of this function. */
*buf += offsetof(DHCP6Option, data);
*buflen -= offsetof(DHCP6Option, data);
memcpy(*buf, &ia_pd, len);
*buf += sizeof(struct ia_pd);
*buflen -= sizeof(struct ia_pd);
DHCP6Address *prefix;
LIST_FOREACH(addresses, prefix, pd->addresses) {
r = option_append_pd_prefix(buf, buflen, prefix);
if (r < 0)
return r;
len += r;
}
if (hint_pd_prefix && hint_pd_prefix->iapdprefix.prefixlen > 0) {
r = option_append_pd_prefix(buf, buflen, hint_pd_prefix);
if (r < 0)
return r;
len += r;
}
return option_append_hdr(&pd_hdr, &pd_buflen, pd->type, len);
}
int dhcp6_option_append_fqdn(uint8_t **buf, size_t *buflen, const char *fqdn) {
uint8_t buffer[1 + DNS_WIRE_FORMAT_HOSTNAME_MAX];
int r;
assert_return(buf && *buf && buflen && fqdn, -EINVAL);
buffer[0] = DHCP6_FQDN_FLAG_S; /* Request server to perform AAAA RR DNS updates */
/* Store domain name after flags field */
r = dns_name_to_wire_format(fqdn, buffer + 1, sizeof(buffer) - 1, false);
if (r <= 0)
return r;
/*
* According to RFC 4704, chapter 4.2 only add terminating zero-length
* label in case a FQDN is provided. Since dns_name_to_wire_format
* always adds terminating zero-length label remove if only a hostname
* is provided.
*/
if (dns_name_is_single_label(fqdn))
r--;
r = dhcp6_option_append(buf, buflen, SD_DHCP6_OPTION_FQDN, 1 + r, buffer);
return r;
}
int dhcp6_option_append_user_class(uint8_t **buf, size_t *buflen, char * const *user_class) {
_cleanup_free_ uint8_t *p = NULL;
size_t total = 0, offset = 0;
char * const *s;
assert(buf);
assert(*buf);
assert(buflen);
assert(!strv_isempty(user_class));
STRV_FOREACH(s, user_class) {
size_t len = strlen(*s);
uint8_t *q;
if (len > 0xffff || len == 0)
return -EINVAL;
q = realloc(p, total + len + 2);
if (!q)
return -ENOMEM;
p = q;
unaligned_write_be16(&p[offset], len);
memcpy(&p[offset + 2], *s, len);
offset += 2 + len;
total += 2 + len;
}
return dhcp6_option_append(buf, buflen, SD_DHCP6_OPTION_USER_CLASS, total, p);
}
int dhcp6_option_append_vendor_class(uint8_t **buf, size_t *buflen, char * const *vendor_class) {
_cleanup_free_ uint8_t *p = NULL;
uint32_t enterprise_identifier;
size_t total, offset;
char * const *s;
assert(buf);
assert(*buf);
assert(buflen);
assert(!strv_isempty(vendor_class));
enterprise_identifier = htobe32(SYSTEMD_PEN);
p = memdup(&enterprise_identifier, sizeof(enterprise_identifier));
if (!p)
return -ENOMEM;
total = sizeof(enterprise_identifier);
offset = total;
STRV_FOREACH(s, vendor_class) {
size_t len = strlen(*s);
uint8_t *q;
if (len > UINT16_MAX || len == 0)
return -EINVAL;
q = realloc(p, total + len + 2);
if (!q)
return -ENOMEM;
p = q;
unaligned_write_be16(&p[offset], len);
memcpy(&p[offset + 2], *s, len);
offset += 2 + len;
total += 2 + len;
}
return dhcp6_option_append(buf, buflen, SD_DHCP6_OPTION_VENDOR_CLASS, total, p);
}
static int option_parse_hdr(uint8_t **buf, size_t *buflen, uint16_t *optcode, size_t *optlen) {
DHCP6Option *option = (DHCP6Option*) *buf;
uint16_t len;
assert_return(buf, -EINVAL);
assert_return(optcode, -EINVAL);
assert_return(optlen, -EINVAL);
if (*buflen < offsetof(DHCP6Option, data))
return -ENOMSG;
len = be16toh(option->len);
if (len > *buflen)
return -ENOMSG;
*optcode = be16toh(option->code);
*optlen = len;
*buf += 4;
*buflen -= 4;
return 0;
}
int dhcp6_option_parse(uint8_t **buf, size_t *buflen, uint16_t *optcode,
size_t *optlen, uint8_t **optvalue) {
int r;
assert_return(buf && buflen && optcode && optlen && optvalue, -EINVAL);
r = option_parse_hdr(buf, buflen, optcode, optlen);
if (r < 0)
return r;
if (*optlen > *buflen)
return -ENOBUFS;
*optvalue = *buf;
*buflen -= *optlen;
*buf += *optlen;
return 0;
}
int dhcp6_option_parse_status(DHCP6Option *option, size_t len) {
DHCP6StatusOption *statusopt = (DHCP6StatusOption *)option;
if (len < sizeof(DHCP6StatusOption) ||
be16toh(option->len) + offsetof(DHCP6Option, data) < sizeof(DHCP6StatusOption))
return -ENOBUFS;
return be16toh(statusopt->status);
}
static int dhcp6_option_parse_address(sd_dhcp6_client *client, DHCP6Option *option, DHCP6IA *ia, uint32_t *ret_lifetime_valid) {
DHCP6AddressOption *addr_option = (DHCP6AddressOption *)option;
DHCP6Address *addr;
uint32_t lt_valid, lt_pref;
int r;
if (be16toh(option->len) + offsetof(DHCP6Option, data) < sizeof(*addr_option))
return -ENOBUFS;
lt_valid = be32toh(addr_option->iaaddr.lifetime_valid);
lt_pref = be32toh(addr_option->iaaddr.lifetime_preferred);
if (lt_valid == 0 || lt_pref > lt_valid)
return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
"Valid lifetime of an IA address is zero or "
"preferred lifetime %"PRIu32" > valid lifetime %"PRIu32,
lt_pref, lt_valid);
if (be16toh(option->len) + offsetof(DHCP6Option, data) > sizeof(*addr_option)) {
r = dhcp6_option_parse_status((DHCP6Option *)addr_option->options, be16toh(option->len) + offsetof(DHCP6Option, data) - sizeof(*addr_option));
if (r < 0)
return r;
if (r > 0)
return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
"Non-zero status code '%s' for address is received",
dhcp6_message_status_to_string(r));
}
addr = new0(DHCP6Address, 1);
if (!addr)
return -ENOMEM;
LIST_INIT(addresses, addr);
memcpy(&addr->iaaddr, option->data, sizeof(addr->iaaddr));
LIST_PREPEND(addresses, ia->addresses, addr);
*ret_lifetime_valid = be32toh(addr->iaaddr.lifetime_valid);
return 0;
}
static int dhcp6_option_parse_pdprefix(sd_dhcp6_client *client, DHCP6Option *option, DHCP6IA *ia, uint32_t *ret_lifetime_valid) {
DHCP6PDPrefixOption *pdprefix_option = (DHCP6PDPrefixOption *)option;
DHCP6Address *prefix;
uint32_t lt_valid, lt_pref;
int r;
if (be16toh(option->len) + offsetof(DHCP6Option, data) < sizeof(*pdprefix_option))
return -ENOBUFS;
lt_valid = be32toh(pdprefix_option->iapdprefix.lifetime_valid);
lt_pref = be32toh(pdprefix_option->iapdprefix.lifetime_preferred);
if (lt_valid == 0 || lt_pref > lt_valid)
return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
"Valid lifetieme of a PD prefix is zero or "
"preferred lifetime %"PRIu32" > valid lifetime %"PRIu32,
lt_pref, lt_valid);
if (be16toh(option->len) + offsetof(DHCP6Option, data) > sizeof(*pdprefix_option)) {
r = dhcp6_option_parse_status((DHCP6Option *)pdprefix_option->options, be16toh(option->len) + offsetof(DHCP6Option, data) - sizeof(*pdprefix_option));
if (r < 0)
return r;
if (r > 0)
return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
"Non-zero status code '%s' for PD prefix is received",
dhcp6_message_status_to_string(r));
}
prefix = new0(DHCP6Address, 1);
if (!prefix)
return -ENOMEM;
LIST_INIT(addresses, prefix);
memcpy(&prefix->iapdprefix, option->data, sizeof(prefix->iapdprefix));
LIST_PREPEND(addresses, ia->addresses, prefix);
*ret_lifetime_valid = be32toh(prefix->iapdprefix.lifetime_valid);
return 0;
}
int dhcp6_option_parse_ia(sd_dhcp6_client *client, DHCP6Option *iaoption, DHCP6IA *ia, uint16_t *ret_status_code) {
uint32_t lt_t1, lt_t2, lt_valid = 0, lt_min = UINT32_MAX;
uint16_t iatype, optlen;
size_t iaaddr_offset;
int r = 0, status;
size_t i, len;
uint16_t opt;
assert_return(ia, -EINVAL);
assert_return(!ia->addresses, -EINVAL);
iatype = be16toh(iaoption->code);
len = be16toh(iaoption->len);
switch (iatype) {
case SD_DHCP6_OPTION_IA_NA:
if (len < DHCP6_OPTION_IA_NA_LEN)
return -ENOBUFS;
iaaddr_offset = DHCP6_OPTION_IA_NA_LEN;
memcpy(&ia->ia_na, iaoption->data, sizeof(ia->ia_na));
lt_t1 = be32toh(ia->ia_na.lifetime_t1);
lt_t2 = be32toh(ia->ia_na.lifetime_t2);
if (lt_t1 > lt_t2)
return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
"IA NA T1 %"PRIu32"sec > T2 %"PRIu32"sec",
lt_t1, lt_t2);
break;
case SD_DHCP6_OPTION_IA_PD:
if (len < sizeof(ia->ia_pd))
return -ENOBUFS;
iaaddr_offset = sizeof(ia->ia_pd);
memcpy(&ia->ia_pd, iaoption->data, sizeof(ia->ia_pd));
lt_t1 = be32toh(ia->ia_pd.lifetime_t1);
lt_t2 = be32toh(ia->ia_pd.lifetime_t2);
if (lt_t1 > lt_t2)
return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
"IA PD T1 %"PRIu32"sec > T2 %"PRIu32"sec",
lt_t1, lt_t2);
break;
case SD_DHCP6_OPTION_IA_TA:
if (len < DHCP6_OPTION_IA_TA_LEN)
return -ENOBUFS;
iaaddr_offset = DHCP6_OPTION_IA_TA_LEN;
memcpy(&ia->ia_ta.id, iaoption->data, sizeof(ia->ia_ta));
break;
default:
return -ENOMSG;
}
ia->type = iatype;
i = iaaddr_offset;
while (i < len) {
DHCP6Option *option = (DHCP6Option *)&iaoption->data[i];
if (len < i + sizeof(*option) || len < i + sizeof(*option) + be16toh(option->len))
return -ENOBUFS;
opt = be16toh(option->code);
optlen = be16toh(option->len);
switch (opt) {
case SD_DHCP6_OPTION_IAADDR:
if (!IN_SET(ia->type, SD_DHCP6_OPTION_IA_NA, SD_DHCP6_OPTION_IA_TA))
return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
"IA Address option not in IA NA or TA option");
r = dhcp6_option_parse_address(client, option, ia, <_valid);
if (r < 0 && r != -EINVAL)
return r;
if (r >= 0 && lt_valid < lt_min)
lt_min = lt_valid;
break;
case SD_DHCP6_OPTION_IA_PD_PREFIX:
if (!IN_SET(ia->type, SD_DHCP6_OPTION_IA_PD))
return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
"IA PD Prefix option not in IA PD option");
r = dhcp6_option_parse_pdprefix(client, option, ia, <_valid);
if (r < 0 && r != -EINVAL)
return r;
if (r >= 0 && lt_valid < lt_min)
lt_min = lt_valid;
break;
case SD_DHCP6_OPTION_STATUS_CODE:
status = dhcp6_option_parse_status(option, optlen + offsetof(DHCP6Option, data));
if (status < 0)
return status;
if (status > 0) {
if (ret_status_code)
*ret_status_code = status;
log_dhcp6_client(client, "IA status %s",
dhcp6_message_status_to_string(status));
return 0;
}
break;
default:
log_dhcp6_client(client, "Unknown IA option %d", opt);
break;
}
i += sizeof(*option) + optlen;
}
switch(iatype) {
case SD_DHCP6_OPTION_IA_NA:
if (ia->ia_na.lifetime_t1 == 0 && ia->ia_na.lifetime_t2 == 0 && lt_min != UINT32_MAX) {
lt_t1 = lt_min / 2;
lt_t2 = lt_min / 10 * 8;
ia->ia_na.lifetime_t1 = htobe32(lt_t1);
ia->ia_na.lifetime_t2 = htobe32(lt_t2);
log_dhcp6_client(client, "Computed IA NA T1 %"PRIu32"sec and T2 %"PRIu32"sec as both were zero",
lt_t1, lt_t2);
}
break;
case SD_DHCP6_OPTION_IA_PD:
if (ia->ia_pd.lifetime_t1 == 0 && ia->ia_pd.lifetime_t2 == 0 && lt_min != UINT32_MAX) {
lt_t1 = lt_min / 2;
lt_t2 = lt_min / 10 * 8;
ia->ia_pd.lifetime_t1 = htobe32(lt_t1);
ia->ia_pd.lifetime_t2 = htobe32(lt_t2);
log_dhcp6_client(client, "Computed IA PD T1 %"PRIu32"sec and T2 %"PRIu32"sec as both were zero",
lt_t1, lt_t2);
}
break;
default:
break;
}
if (ret_status_code)
*ret_status_code = 0;
return 1;
}
int dhcp6_option_parse_ip6addrs(uint8_t *optval, uint16_t optlen,
struct in6_addr **addrs, size_t count,
size_t *allocated) {
if (optlen == 0 || optlen % sizeof(struct in6_addr) != 0)
return -EINVAL;
if (!GREEDY_REALLOC(*addrs, *allocated,
count * sizeof(struct in6_addr) + optlen))
return -ENOMEM;
memcpy(*addrs + count, optval, optlen);
count += optlen / sizeof(struct in6_addr);
return count;
}
static int parse_domain(const uint8_t **data, uint16_t *len, char **out_domain) {
_cleanup_free_ char *ret = NULL;
size_t n = 0, allocated = 0;
const uint8_t *optval = *data;
uint16_t optlen = *len;
bool first = true;
int r;
if (optlen <= 1)
return -ENODATA;
for (;;) {
const char *label;
uint8_t c;
if (optlen == 0)
break;
c = *optval;
optval++;
optlen--;
if (c == 0)
/* End label */
break;
if (c > 63)
return -EBADMSG;
if (c > optlen)
return -EMSGSIZE;
/* Literal label */
label = (const char *)optval;
optval += c;
optlen -= c;
if (!GREEDY_REALLOC(ret, allocated, n + !first + DNS_LABEL_ESCAPED_MAX))
return -ENOMEM;
if (first)
first = false;
else
ret[n++] = '.';
r = dns_label_escape(label, c, ret + n, DNS_LABEL_ESCAPED_MAX);
if (r < 0)
return r;
n += r;
}
if (n) {
if (!GREEDY_REALLOC(ret, allocated, n + 1))
return -ENOMEM;
ret[n] = 0;
}
*out_domain = TAKE_PTR(ret);
*data = optval;
*len = optlen;
return n;
}
int dhcp6_option_parse_domainname(const uint8_t *optval, uint16_t optlen, char **str) {
_cleanup_free_ char *domain = NULL;
int r;
r = parse_domain(&optval, &optlen, &domain);
if (r < 0)
return r;
if (r == 0)
return -ENODATA;
if (optlen != 0)
return -EINVAL;
*str = TAKE_PTR(domain);
return 0;
}
int dhcp6_option_parse_domainname_list(const uint8_t *optval, uint16_t optlen, char ***str_arr) {
size_t idx = 0;
_cleanup_strv_free_ char **names = NULL;
int r;
if (optlen <= 1)
return -ENODATA;
if (optval[optlen - 1] != '\0')
return -EINVAL;
while (optlen > 0) {
_cleanup_free_ char *ret = NULL;
r = parse_domain(&optval, &optlen, &ret);
if (r < 0)
return r;
if (r == 0)
continue;
r = strv_extend(&names, ret);
if (r < 0)
return r;
idx++;
}
*str_arr = TAKE_PTR(names);
return idx;
}
static sd_dhcp6_option* dhcp6_option_free(sd_dhcp6_option *i) {
if (!i)
return NULL;
free(i->data);
return mfree(i);
}
int sd_dhcp6_option_new(uint16_t option, const void *data, size_t length, uint32_t enterprise_identifier, sd_dhcp6_option **ret) {
assert_return(ret, -EINVAL);
assert_return(length == 0 || data, -EINVAL);
_cleanup_free_ void *q = memdup(data, length);
if (!q)
return -ENOMEM;
sd_dhcp6_option *p = new(sd_dhcp6_option, 1);
if (!p)
return -ENOMEM;
*p = (sd_dhcp6_option) {
.n_ref = 1,
.option = option,
.enterprise_identifier = enterprise_identifier,
.length = length,
.data = TAKE_PTR(q),
};
*ret = p;
return 0;
}
DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp6_option, sd_dhcp6_option, dhcp6_option_free);
DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(
dhcp6_option_hash_ops,
void,
trivial_hash_func,
trivial_compare_func,
sd_dhcp6_option,
sd_dhcp6_option_unref);