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DHCP client: make SendOption work for DHCPv6 too.

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This commit is contained in:
Andrew Doran 2020-05-01 10:30:31 -04:00 committed by Lennart Poettering
parent 2d5996c175
commit e7d5fe17db
13 changed files with 232 additions and 40 deletions
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10
man/systemd.network.xml
View File

@ -1748,6 +1748,14 @@
Defaults to false.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>SendOption=</varname></term>
<listitem>
<para>As in the <literal>[DHCPv4]</literal> section, however because DHCPv6 uses 16-bit fields to store
option numbers, the option number is an integer in the range 1..65536.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
@ -1985,7 +1993,7 @@
<para>Send a raw option with value via DHCPv4 server. Takes a DHCP option number, data type
and data (<literal><replaceable>option</replaceable>:<replaceable>type</replaceable>:<replaceable>value</replaceable></literal>).
The option number is an integer in the range 1..254. The type takes one of <literal>uint8</literal>,
<literal>uint16</literal>, <literal>uint32</literal>, <literal>ipv4address</literal>, or
<literal>uint16</literal>, <literal>uint32</literal>, <literal>ipv4address</literal>, <literal>ipv6address</literal>, or
<literal>string</literal>. Special characters in the data string may be escaped using
<ulink url="https://en.wikipedia.org/wiki/Escape_sequences_in_C#Table_of_escape_sequences">C-style
escapes</ulink>. This setting can be specified multiple times. If an empty string is specified,

1
src/libsystemd-network/dhcp-server-internal.h
View File

@ -19,6 +19,7 @@ typedef enum DHCPRawOption {
DHCP_RAW_OPTION_DATA_UINT32,
DHCP_RAW_OPTION_DATA_STRING,
DHCP_RAW_OPTION_DATA_IPV4ADDRESS,
DHCP_RAW_OPTION_DATA_IPV6ADDRESS,
_DHCP_RAW_OPTION_DATA_MAX,
_DHCP_RAW_OPTION_DATA_INVALID,
} DHCPRawOption;

10
src/libsystemd-network/dhcp6-internal.h
View File

@ -14,6 +14,16 @@
#include "macro.h"
#include "sparse-endian.h"
typedef struct sd_dhcp6_option {
unsigned n_ref;
uint16_t option;
void *data;
size_t length;
} sd_dhcp6_option;
extern const struct hash_ops dhcp6_option_hash_ops;
/* Common option header */
typedef struct DHCP6Option {
be16_t code;

40
src/libsystemd-network/dhcp6-option.c
View File

@ -597,3 +597,43 @@ int dhcp6_option_parse_domainname(const uint8_t *optval, uint16_t optlen, char *
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, 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,
.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);

28
src/libsystemd-network/sd-dhcp6-client.c
View File

@ -78,6 +78,7 @@ struct sd_dhcp6_client {
size_t duid_len;
usec_t information_request_time_usec;
usec_t information_refresh_time_usec;
OrderedHashmap *extra_options;
};
static const uint16_t default_req_opts[] = {
@ -447,6 +448,24 @@ int sd_dhcp6_client_get_lease(sd_dhcp6_client *client, sd_dhcp6_lease **ret) {
return 0;
}
int sd_dhcp6_client_add_option(sd_dhcp6_client *client, sd_dhcp6_option *v) {
int r;
assert_return(client, -EINVAL);
assert_return(v, -EINVAL);
r = ordered_hashmap_ensure_allocated(&client->extra_options, &dhcp6_option_hash_ops);
if (r < 0)
return r;
r = ordered_hashmap_put(client->extra_options, UINT_TO_PTR(v->option), v);
if (r < 0)
return r;
sd_dhcp6_option_ref(v);
return 0;
}
static void client_notify(sd_dhcp6_client *client, int event) {
assert(client);
@ -492,7 +511,9 @@ static int client_send_message(sd_dhcp6_client *client, usec_t time_now) {
_cleanup_free_ DHCP6Message *message = NULL;
struct in6_addr all_servers =
IN6ADDR_ALL_DHCP6_RELAY_AGENTS_AND_SERVERS_INIT;
struct sd_dhcp6_option *j;
size_t len, optlen = 512;
Iterator i;
uint8_t *opt;
int r;
usec_t elapsed_usec;
@ -672,6 +693,12 @@ static int client_send_message(sd_dhcp6_client *client, usec_t time_now) {
if (r < 0)
return r;
ORDERED_HASHMAP_FOREACH(j, client->extra_options, i) {
r = dhcp6_option_append(&opt, &optlen, j->option, j->length, j->data);
if (r < 0)
return r;
}
r = dhcp6_network_send_udp_socket(client->fd, &all_servers, message,
len - optlen);
if (r < 0)
@ -1584,6 +1611,7 @@ static sd_dhcp6_client *dhcp6_client_free(sd_dhcp6_client *client) {
free(client->req_opts);
free(client->fqdn);
free(client->mudurl);
ordered_hashmap_free(client->extra_options);
return mfree(client);
}

127
src/network/networkd-dhcp-common.c
View File

@ -1,6 +1,7 @@
/* SPDX-License-Identifier: LGPL-2.1+ */
#include "dhcp-internal.h"
#include "dhcp6-internal.h"
#include "escape.h"
#include "in-addr-util.h"
#include "networkd-dhcp-common.h"
@ -320,13 +321,14 @@ int config_parse_dhcp_send_option(
void *data,
void *userdata) {
_cleanup_(sd_dhcp_option_unrefp) sd_dhcp_option *opt = NULL, *old = NULL;
_cleanup_(sd_dhcp_option_unrefp) sd_dhcp_option *opt4 = NULL, *old4 = NULL;
_cleanup_(sd_dhcp6_option_unrefp) sd_dhcp6_option *opt6 = NULL, *old6 = NULL;
_cleanup_free_ char *word = NULL, *q = NULL;
OrderedHashmap **options = data;
union in_addr_union addr;
DHCPOptionDataType type;
uint8_t u, uint8_data;
uint16_t uint16_data;
uint8_t u8, uint8_data;
uint16_t u16, uint16_data;
uint32_t uint32_data;
const void *udata;
const char *p;
@ -353,16 +355,30 @@ int config_parse_dhcp_send_option(
return 0;
}
r = safe_atou8(word, &u);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Invalid DHCP option, ignoring assignment: %s", rvalue);
return 0;
}
if (u < 1 || u >= 255) {
log_syntax(unit, LOG_ERR, filename, line, 0,
"Invalid DHCP option, valid range is 1-254, ignoring assignment: %s", rvalue);
return 0;
if (ltype == AF_INET6) {
r = safe_atou16(word, &u16);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Invalid DHCP option, ignoring assignment: %s", rvalue);
return 0;
}
if (u16 < 1 || u16 >= 65535) {
log_syntax(unit, LOG_ERR, filename, line, 0,
"Invalid DHCP option, valid range is 1-65535, ignoring assignment: %s", rvalue);
return 0;
}
} else {
r = safe_atou8(word, &u8);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Invalid DHCP option, ignoring assignment: %s", rvalue);
return 0;
}
if (u8 < 1 || u8 >= 255) {
log_syntax(unit, LOG_ERR, filename, line, 0,
"Invalid DHCP option, valid range is 1-254, ignoring assignment: %s", rvalue);
return 0;
}
}
word = mfree(word);
@ -387,7 +403,7 @@ int config_parse_dhcp_send_option(
r = safe_atou8(p, &uint8_data);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to parse DHCPv4 uint8 data, ignoring assignment: %s", p);
"Failed to parse DHCP uint8 data, ignoring assignment: %s", p);
return 0;
}
@ -399,7 +415,7 @@ int config_parse_dhcp_send_option(
r = safe_atou16(p, &uint16_data);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to parse DHCPv4 uint16 data, ignoring assignment: %s", p);
"Failed to parse DHCP uint16 data, ignoring assignment: %s", p);
return 0;
}
@ -411,7 +427,7 @@ int config_parse_dhcp_send_option(
r = safe_atou32(p, &uint32_data);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to parse DHCPv4 uint32 data, ignoring assignment: %s", p);
"Failed to parse DHCP uint32 data, ignoring assignment: %s", p);
return 0;
}
@ -424,7 +440,7 @@ int config_parse_dhcp_send_option(
r = in_addr_from_string(AF_INET, p, &addr);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to parse DHCPv4 ipv4address data, ignoring assignment: %s", p);
"Failed to parse DHCP ipv4address data, ignoring assignment: %s", p);
return 0;
}
@ -432,11 +448,23 @@ int config_parse_dhcp_send_option(
sz = sizeof(addr.in.s_addr);
break;
}
case DHCP_OPTION_DATA_IPV6ADDRESS: {
r = in_addr_from_string(AF_INET6, p, &addr);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to parse DHCP ipv6address data, ignoring assignment: %s", p);
return 0;
}
udata = &addr.in6;
sz = sizeof(addr.in6.s6_addr);
break;
}
case DHCP_OPTION_DATA_STRING:
sz = cunescape(p, UNESCAPE_ACCEPT_NUL, &q);
if (sz < 0) {
log_syntax(unit, LOG_ERR, filename, line, sz,
"Failed to decode DHCPv4 option data, ignoring assignment: %s", p);
"Failed to decode DHCP option data, ignoring assignment: %s", p);
}
udata = q;
@ -445,27 +473,49 @@ int config_parse_dhcp_send_option(
return -EINVAL;
}
r = sd_dhcp_option_new(u, udata, sz, &opt);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to store DHCPv4 option '%s', ignoring assignment: %m", rvalue);
return 0;
if (ltype == AF_INET6) {
r = sd_dhcp6_option_new(u16, udata, sz, &opt6);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to store DHCP option '%s', ignoring assignment: %m", rvalue);
return 0;
}
r = ordered_hashmap_ensure_allocated(options, &dhcp6_option_hash_ops);
if (r < 0)
return log_oom();
/* Overwrite existing option */
old6 = ordered_hashmap_get(*options, UINT_TO_PTR(u16));
r = ordered_hashmap_replace(*options, UINT_TO_PTR(u16), opt6);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to store DHCP option '%s', ignoring assignment: %m", rvalue);
return 0;
}
TAKE_PTR(opt6);
} else {
r = sd_dhcp_option_new(u8, udata, sz, &opt4);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to store DHCP option '%s', ignoring assignment: %m", rvalue);
return 0;
}
r = ordered_hashmap_ensure_allocated(options, &dhcp_option_hash_ops);
if (r < 0)
return log_oom();
/* Overwrite existing option */
old4 = ordered_hashmap_get(*options, UINT_TO_PTR(u8));
r = ordered_hashmap_replace(*options, UINT_TO_PTR(u8), opt4);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to store DHCP option '%s', ignoring assignment: %m", rvalue);
return 0;
}
TAKE_PTR(opt4);
}
r = ordered_hashmap_ensure_allocated(options, &dhcp_option_hash_ops);
if (r < 0)
return log_oom();
/* Overwrite existing option */
old = ordered_hashmap_remove(*options, UINT_TO_PTR(u));
r = ordered_hashmap_put(*options, UINT_TO_PTR(u), opt);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to store DHCPv4 option '%s', ignoring assignment: %m", rvalue);
return 0;
}
TAKE_PTR(opt);
return 0;
}
@ -486,6 +536,7 @@ static const char * const dhcp_option_data_type_table[_DHCP_OPTION_DATA_MAX] = {
[DHCP_OPTION_DATA_UINT32] = "uint32",
[DHCP_OPTION_DATA_STRING] = "string",
[DHCP_OPTION_DATA_IPV4ADDRESS] = "ipv4address",
[DHCP_OPTION_DATA_IPV6ADDRESS] = "ipv6address",
};
DEFINE_STRING_TABLE_LOOKUP(dhcp_option_data_type, DHCPOptionDataType);

1
src/network/networkd-dhcp-common.h
View File

@ -21,6 +21,7 @@ typedef enum DHCPOptionDataType {
DHCP_OPTION_DATA_UINT32,
DHCP_OPTION_DATA_STRING,
DHCP_OPTION_DATA_IPV4ADDRESS,
DHCP_OPTION_DATA_IPV6ADDRESS,
_DHCP_OPTION_DATA_MAX,
_DHCP_OPTION_DATA_INVALID,
} DHCPOptionDataType;

10
src/network/networkd-dhcp6.c
View File

@ -620,7 +620,9 @@ static int dhcp6_set_hostname(sd_dhcp6_client *client, Link *link) {
int dhcp6_configure(Link *link) {
_cleanup_(sd_dhcp6_client_unrefp) sd_dhcp6_client *client = NULL;
sd_dhcp6_option *send_option;
const DUID *duid;
Iterator i;
int r;
assert(link);
@ -662,6 +664,14 @@ int dhcp6_configure(Link *link) {
if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set DUID: %m");
ORDERED_HASHMAP_FOREACH(send_option, link->network->dhcp6_client_send_options, i) {
r = sd_dhcp6_client_add_option(client, send_option);
if (r == -EEXIST)
continue;
if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set option: %m");
}
r = dhcp6_set_hostname(client, link);
if (r < 0)
return r;

3
src/network/networkd-network-gperf.gperf
View File

@ -185,7 +185,7 @@ DHCPv4.SendRelease, config_parse_bool,
DHCPv4.SendDecline, config_parse_bool, 0, offsetof(Network, dhcp_send_decline)
DHCPv4.BlackList, config_parse_dhcp_black_listed_ip_address, 0, 0
DHCPv4.IPServiceType, config_parse_dhcp_ip_service_type, 0, offsetof(Network, ip_service_type)
DHCPv4.SendOption, config_parse_dhcp_send_option, 0, offsetof(Network, dhcp_client_send_options)
DHCPv4.SendOption, config_parse_dhcp_send_option, AF_INET, offsetof(Network, dhcp_client_send_options)
DHCPv4.SendVendorOption, config_parse_dhcp_send_option, 0, offsetof(Network, dhcp_client_send_vendor_options)
DHCPv4.RouteMTUBytes, config_parse_mtu, AF_INET, offsetof(Network, dhcp_route_mtu)
DHCPv6.UseDNS, config_parse_bool, 0, offsetof(Network, dhcp6_use_dns)
@ -195,6 +195,7 @@ DHCPv6.MUDURL, config_parse_dhcp6_mud_url,
DHCPv6.ForceDHCPv6PDOtherInformation, config_parse_bool, 0, offsetof(Network, dhcp6_force_pd_other_information)
DHCPv6.PrefixDelegationHint, config_parse_dhcp6_pd_hint, 0, 0
DHCPv6.WithoutRA, config_parse_bool, 0, offsetof(Network, dhcp6_without_ra)
DHCPv6.SendOption, config_parse_dhcp_send_option, AF_INET6, offsetof(Network, dhcp6_client_send_options)
IPv6AcceptRA.UseAutonomousPrefix, config_parse_bool, 0, offsetof(Network, ipv6_accept_ra_use_autonomous_prefix)
IPv6AcceptRA.UseOnLinkPrefix, config_parse_bool, 0, offsetof(Network, ipv6_accept_ra_use_onlink_prefix)
IPv6AcceptRA.UseDNS, config_parse_bool, 0, offsetof(Network, ipv6_accept_ra_use_dns)

1
src/network/networkd-network.h
View File

@ -133,6 +133,7 @@ struct Network {
uint8_t dhcp6_pd_length;
char *dhcp6_mudurl;
struct in6_addr dhcp6_pd_address;
OrderedHashmap *dhcp6_client_send_options;
/* DHCP Server Support */
bool dhcp_server;

3
src/systemd/sd-dhcp6-client.h
View File

@ -24,6 +24,7 @@
#include <sys/types.h>
#include "sd-dhcp6-lease.h"
#include "sd-dhcp6-option.h"
#include "sd-event.h"
#include "_sd-common.h"
@ -142,6 +143,8 @@ int sd_dhcp6_client_get_lease(
sd_dhcp6_client *client,
sd_dhcp6_lease **ret);
int sd_dhcp6_client_add_option(sd_dhcp6_client *client, sd_dhcp6_option *v);
int sd_dhcp6_client_stop(sd_dhcp6_client *client);
int sd_dhcp6_client_start(sd_dhcp6_client *client);
int sd_dhcp6_client_is_running(sd_dhcp6_client *client);

37
src/systemd/sd-dhcp6-option.h Normal file
View File

@ -0,0 +1,37 @@
/* SPDX-License-Identifier: LGPL-2.1+ */
#ifndef foosddhcp6optionhfoo
#define foosddhcp6optionhfoo
/***
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <inttypes.h>
#include <sys/types.h>
#include "_sd-common.h"
_SD_BEGIN_DECLARATIONS;
typedef struct sd_dhcp6_option sd_dhcp6_option;
int sd_dhcp6_option_new(uint16_t option, const void *data, size_t length, sd_dhcp6_option **ret);
sd_dhcp6_option *sd_dhcp6_option_ref(sd_dhcp6_option *ra);
sd_dhcp6_option *sd_dhcp6_option_unref(sd_dhcp6_option *ra);
_SD_DEFINE_POINTER_CLEANUP_FUNC(sd_dhcp6_option, sd_dhcp6_option_unref);
_SD_END_DECLARATIONS;
#endif

1
test/fuzz/fuzz-network-parser/directives.network
View File

@ -112,6 +112,7 @@ ForceDHCPv6PDOtherInformation=
PrefixDelegationHint=
WithoutRA=
MUDURL=
SendOption=
[Route]
Destination=
Protocol=