1014 lines
30 KiB
C
1014 lines
30 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
|
|
/***
|
|
This file is part of systemd.
|
|
|
|
Copyright 2013 Tom Gundersen <teg@jklm.no>
|
|
|
|
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 <netinet/in.h>
|
|
#include <stdbool.h>
|
|
#include <unistd.h>
|
|
|
|
#include "sd-netlink.h"
|
|
|
|
#include "alloc-util.h"
|
|
#include "format-util.h"
|
|
#include "missing.h"
|
|
#include "netlink-internal.h"
|
|
#include "netlink-types.h"
|
|
#include "netlink-util.h"
|
|
#include "refcnt.h"
|
|
#include "socket-util.h"
|
|
#include "util.h"
|
|
|
|
#define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->containers[i].offset) : NULL)
|
|
#define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr;
|
|
|
|
#define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK)
|
|
#define RTA_FLAGS(rta) ((rta)->rta_type & ~NLA_TYPE_MASK)
|
|
|
|
int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret) {
|
|
sd_netlink_message *m;
|
|
|
|
assert_return(ret, -EINVAL);
|
|
|
|
/* Note that 'rtnl' is currently unused, if we start using it internally
|
|
we must take care to avoid problems due to mutual references between
|
|
buses and their queued messages. See sd-bus.
|
|
*/
|
|
|
|
m = new0(sd_netlink_message, 1);
|
|
if (!m)
|
|
return -ENOMEM;
|
|
|
|
m->n_ref = REFCNT_INIT;
|
|
m->protocol = rtnl->protocol;
|
|
m->sealed = false;
|
|
|
|
*ret = m;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type) {
|
|
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
|
|
const NLType *nl_type;
|
|
const NLTypeSystem *type_system_root;
|
|
size_t size;
|
|
int r;
|
|
|
|
assert_return(rtnl, -EINVAL);
|
|
|
|
type_system_root = type_system_get_root(rtnl->protocol);
|
|
|
|
r = type_system_get_type(type_system_root, &nl_type, type);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (type_get_type(nl_type) != NETLINK_TYPE_NESTED)
|
|
return -EINVAL;
|
|
|
|
r = message_new_empty(rtnl, &m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
size = NLMSG_SPACE(type_get_size(nl_type));
|
|
|
|
assert(size >= sizeof(struct nlmsghdr));
|
|
m->hdr = malloc0(size);
|
|
if (!m->hdr)
|
|
return -ENOMEM;
|
|
|
|
m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
|
|
|
|
type_get_type_system(nl_type, &m->containers[0].type_system);
|
|
m->hdr->nlmsg_len = size;
|
|
m->hdr->nlmsg_type = type;
|
|
|
|
*ret = m;
|
|
m = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) {
|
|
assert_return(m, -EINVAL);
|
|
assert_return(m->hdr, -EINVAL);
|
|
|
|
assert_return(IN_SET(m->hdr->nlmsg_type, RTM_GETLINK, RTM_GETADDR, RTM_GETROUTE, RTM_GETNEIGH, RTM_GETRULE, RTM_GETADDRLABEL), -EINVAL);
|
|
|
|
SET_FLAG(m->hdr->nlmsg_flags, NLM_F_DUMP, dump);
|
|
|
|
return 0;
|
|
}
|
|
|
|
sd_netlink_message *sd_netlink_message_ref(sd_netlink_message *m) {
|
|
if (!m)
|
|
return NULL;
|
|
|
|
assert_se(REFCNT_INC(m->n_ref) >= 2);
|
|
return m;
|
|
}
|
|
|
|
sd_netlink_message *sd_netlink_message_unref(sd_netlink_message *m) {
|
|
sd_netlink_message *t;
|
|
|
|
while (m && REFCNT_DEC(m->n_ref) == 0) {
|
|
unsigned i;
|
|
|
|
free(m->hdr);
|
|
|
|
for (i = 0; i <= m->n_containers; i++)
|
|
free(m->containers[i].attributes);
|
|
|
|
t = m;
|
|
m = m->next;
|
|
free(t);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *type) {
|
|
assert_return(m, -EINVAL);
|
|
assert_return(type, -EINVAL);
|
|
|
|
*type = m->hdr->nlmsg_type;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_set_flags(sd_netlink_message *m, uint16_t flags) {
|
|
assert_return(m, -EINVAL);
|
|
assert_return(flags, -EINVAL);
|
|
|
|
m->hdr->nlmsg_flags = flags;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_is_broadcast(sd_netlink_message *m) {
|
|
assert_return(m, -EINVAL);
|
|
|
|
return m->broadcast;
|
|
}
|
|
|
|
/* If successful the updated message will be correctly aligned, if
|
|
unsuccessful the old message is untouched. */
|
|
static int add_rtattr(sd_netlink_message *m, unsigned short type, const void *data, size_t data_length) {
|
|
uint32_t rta_length;
|
|
size_t message_length, padding_length;
|
|
struct nlmsghdr *new_hdr;
|
|
struct rtattr *rta;
|
|
char *padding;
|
|
unsigned i;
|
|
int offset;
|
|
|
|
assert(m);
|
|
assert(m->hdr);
|
|
assert(!m->sealed);
|
|
assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len);
|
|
assert(!data || data_length);
|
|
|
|
/* get offset of the new attribute */
|
|
offset = m->hdr->nlmsg_len;
|
|
|
|
/* get the size of the new rta attribute (with padding at the end) */
|
|
rta_length = RTA_LENGTH(data_length);
|
|
|
|
/* get the new message size (with padding at the end) */
|
|
message_length = offset + RTA_ALIGN(rta_length);
|
|
|
|
/* buffer should be smaller than both one page or 8K to be accepted by the kernel */
|
|
if (message_length > MIN(page_size(), 8192UL))
|
|
return -ENOBUFS;
|
|
|
|
/* realloc to fit the new attribute */
|
|
new_hdr = realloc(m->hdr, message_length);
|
|
if (!new_hdr)
|
|
return -ENOMEM;
|
|
m->hdr = new_hdr;
|
|
|
|
/* get pointer to the attribute we are about to add */
|
|
rta = (struct rtattr *) ((uint8_t *) m->hdr + offset);
|
|
|
|
/* if we are inside containers, extend them */
|
|
for (i = 0; i < m->n_containers; i++)
|
|
GET_CONTAINER(m, i)->rta_len += message_length - offset;
|
|
|
|
/* fill in the attribute */
|
|
rta->rta_type = type;
|
|
rta->rta_len = rta_length;
|
|
if (data)
|
|
/* we don't deal with the case where the user lies about the type
|
|
* and gives us too little data (so don't do that)
|
|
*/
|
|
padding = mempcpy(RTA_DATA(rta), data, data_length);
|
|
|
|
else
|
|
/* if no data was passed, make sure we still initialize the padding
|
|
note that we can have data_length > 0 (used by some containers) */
|
|
padding = RTA_DATA(rta);
|
|
|
|
/* make sure also the padding at the end of the message is initialized */
|
|
padding_length = (uint8_t*)m->hdr + message_length - (uint8_t*)padding;
|
|
memzero(padding, padding_length);
|
|
|
|
/* update message size */
|
|
m->hdr->nlmsg_len = message_length;
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int message_attribute_has_type(sd_netlink_message *m, size_t *out_size, uint16_t attribute_type, uint16_t data_type) {
|
|
const NLType *type;
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
r = type_system_get_type(m->containers[m->n_containers].type_system, &type, attribute_type);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (type_get_type(type) != data_type)
|
|
return -EINVAL;
|
|
|
|
if (out_size)
|
|
*out_size = type_get_size(type);
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_append_string(sd_netlink_message *m, unsigned short type, const char *data) {
|
|
size_t length, size;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
assert_return(data, -EINVAL);
|
|
|
|
r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_STRING);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (size) {
|
|
length = strnlen(data, size+1);
|
|
if (length > size)
|
|
return -EINVAL;
|
|
} else
|
|
length = strlen(data);
|
|
|
|
r = add_rtattr(m, type, data, length + 1);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_append_flag(sd_netlink_message *m, unsigned short type) {
|
|
size_t size;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
|
|
r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_FLAG);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = add_rtattr(m, type, NULL, 0);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_append_u8(sd_netlink_message *m, unsigned short type, uint8_t data) {
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
|
|
r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = add_rtattr(m, type, &data, sizeof(uint8_t));
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int sd_netlink_message_append_u16(sd_netlink_message *m, unsigned short type, uint16_t data) {
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
|
|
r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = add_rtattr(m, type, &data, sizeof(uint16_t));
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_append_u32(sd_netlink_message *m, unsigned short type, uint32_t data) {
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
|
|
r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = add_rtattr(m, type, &data, sizeof(uint32_t));
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_append_data(sd_netlink_message *m, unsigned short type, const void *data, size_t len) {
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
|
|
r = add_rtattr(m, type, data, len);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_append_in_addr(sd_netlink_message *m, unsigned short type, const struct in_addr *data) {
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
assert_return(data, -EINVAL);
|
|
|
|
r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = add_rtattr(m, type, data, sizeof(struct in_addr));
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_append_in6_addr(sd_netlink_message *m, unsigned short type, const struct in6_addr *data) {
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
assert_return(data, -EINVAL);
|
|
|
|
r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = add_rtattr(m, type, data, sizeof(struct in6_addr));
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_append_ether_addr(sd_netlink_message *m, unsigned short type, const struct ether_addr *data) {
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
assert_return(data, -EINVAL);
|
|
|
|
r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = add_rtattr(m, type, data, ETH_ALEN);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_append_cache_info(sd_netlink_message *m, unsigned short type, const struct ifa_cacheinfo *info) {
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
assert_return(info, -EINVAL);
|
|
|
|
r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo));
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type) {
|
|
size_t size;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE);
|
|
|
|
r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_NESTED);
|
|
if (r < 0) {
|
|
const NLTypeSystemUnion *type_system_union;
|
|
int family;
|
|
|
|
r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_UNION);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_rtnl_message_get_family(m, &family);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = type_system_union_protocol_get_type_system(type_system_union,
|
|
&m->containers[m->n_containers + 1].type_system,
|
|
family);
|
|
if (r < 0)
|
|
return r;
|
|
} else {
|
|
r = type_system_get_type_system(m->containers[m->n_containers].type_system,
|
|
&m->containers[m->n_containers + 1].type_system,
|
|
type);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
r = add_rtattr(m, type | NLA_F_NESTED, NULL, size);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
m->containers[m->n_containers++].offset = r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_open_container_union(sd_netlink_message *m, unsigned short type, const char *key) {
|
|
const NLTypeSystemUnion *type_system_union;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
|
|
r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = type_system_union_get_type_system(type_system_union,
|
|
&m->containers[m->n_containers + 1].type_system,
|
|
key);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_netlink_message_append_string(m, type_system_union->match, key);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* do we ever need non-null size */
|
|
r = add_rtattr(m, type | NLA_F_NESTED, NULL, 0);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
m->containers[m->n_containers++].offset = r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_close_container(sd_netlink_message *m) {
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
assert_return(m->n_containers > 0, -EINVAL);
|
|
|
|
m->containers[m->n_containers].type_system = NULL;
|
|
m->containers[m->n_containers].offset = 0;
|
|
m->n_containers--;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_open_array(sd_netlink_message *m, uint16_t type) {
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
assert_return(m->n_containers > 0, -EINVAL);
|
|
|
|
r = add_rtattr(m, type | NLA_F_NESTED, NULL, 0);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
m->containers[m->n_containers].offset = r;
|
|
m->n_containers++;
|
|
m->containers[m->n_containers].type_system = m->containers[m->n_containers - 1].type_system;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_cancel_array(sd_netlink_message *m) {
|
|
unsigned i;
|
|
uint32_t rta_len;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
assert_return(m->n_containers > 1, -EINVAL);
|
|
|
|
rta_len = GET_CONTAINER(m, (m->n_containers - 1))->rta_len;
|
|
|
|
for (i = 0; i < m->n_containers; i++)
|
|
GET_CONTAINER(m, i)->rta_len -= rta_len;
|
|
|
|
m->hdr->nlmsg_len -= rta_len;
|
|
|
|
m->n_containers--;
|
|
m->containers[m->n_containers].type_system = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int netlink_message_read_internal(sd_netlink_message *m, unsigned short type, void **data, bool *net_byteorder) {
|
|
struct netlink_attribute *attribute;
|
|
struct rtattr *rta;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(m->sealed, -EPERM);
|
|
assert_return(data, -EINVAL);
|
|
|
|
assert(m->n_containers < RTNL_CONTAINER_DEPTH);
|
|
assert(m->containers[m->n_containers].attributes);
|
|
assert(type < m->containers[m->n_containers].n_attributes);
|
|
|
|
attribute = &m->containers[m->n_containers].attributes[type];
|
|
|
|
if (attribute->offset == 0)
|
|
return -ENODATA;
|
|
|
|
rta = (struct rtattr*)((uint8_t *) m->hdr + attribute->offset);
|
|
|
|
*data = RTA_DATA(rta);
|
|
|
|
if (net_byteorder)
|
|
*net_byteorder = attribute->net_byteorder;
|
|
|
|
return RTA_PAYLOAD(rta);
|
|
}
|
|
|
|
int sd_netlink_message_read_string(sd_netlink_message *m, unsigned short type, const char **data) {
|
|
int r;
|
|
void *attr_data;
|
|
|
|
assert_return(m, -EINVAL);
|
|
|
|
r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_STRING);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = netlink_message_read_internal(m, type, &attr_data, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
else if (strnlen(attr_data, r) >= (size_t) r)
|
|
return -EIO;
|
|
|
|
if (data)
|
|
*data = (const char *) attr_data;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8_t *data) {
|
|
int r;
|
|
void *attr_data;
|
|
|
|
assert_return(m, -EINVAL);
|
|
|
|
r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = netlink_message_read_internal(m, type, &attr_data, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
else if ((size_t) r < sizeof(uint8_t))
|
|
return -EIO;
|
|
|
|
if (data)
|
|
*data = *(uint8_t *) attr_data;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint16_t *data) {
|
|
void *attr_data;
|
|
bool net_byteorder;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
|
|
r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder);
|
|
if (r < 0)
|
|
return r;
|
|
else if ((size_t) r < sizeof(uint16_t))
|
|
return -EIO;
|
|
|
|
if (data) {
|
|
if (net_byteorder)
|
|
*data = be16toh(*(uint16_t *) attr_data);
|
|
else
|
|
*data = *(uint16_t *) attr_data;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint32_t *data) {
|
|
void *attr_data;
|
|
bool net_byteorder;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
|
|
r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder);
|
|
if (r < 0)
|
|
return r;
|
|
else if ((size_t)r < sizeof(uint32_t))
|
|
return -EIO;
|
|
|
|
if (data) {
|
|
if (net_byteorder)
|
|
*data = be32toh(*(uint32_t *) attr_data);
|
|
else
|
|
*data = *(uint32_t *) attr_data;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_read_ether_addr(sd_netlink_message *m, unsigned short type, struct ether_addr *data) {
|
|
int r;
|
|
void *attr_data;
|
|
|
|
assert_return(m, -EINVAL);
|
|
|
|
r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = netlink_message_read_internal(m, type, &attr_data, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
else if ((size_t)r < sizeof(struct ether_addr))
|
|
return -EIO;
|
|
|
|
if (data)
|
|
memcpy(data, attr_data, sizeof(struct ether_addr));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_read_cache_info(sd_netlink_message *m, unsigned short type, struct ifa_cacheinfo *info) {
|
|
int r;
|
|
void *attr_data;
|
|
|
|
assert_return(m, -EINVAL);
|
|
|
|
r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = netlink_message_read_internal(m, type, &attr_data, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
else if ((size_t)r < sizeof(struct ifa_cacheinfo))
|
|
return -EIO;
|
|
|
|
if (info)
|
|
memcpy(info, attr_data, sizeof(struct ifa_cacheinfo));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_read_in_addr(sd_netlink_message *m, unsigned short type, struct in_addr *data) {
|
|
int r;
|
|
void *attr_data;
|
|
|
|
assert_return(m, -EINVAL);
|
|
|
|
r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = netlink_message_read_internal(m, type, &attr_data, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
else if ((size_t)r < sizeof(struct in_addr))
|
|
return -EIO;
|
|
|
|
if (data)
|
|
memcpy(data, attr_data, sizeof(struct in_addr));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type, struct in6_addr *data) {
|
|
int r;
|
|
void *attr_data;
|
|
|
|
assert_return(m, -EINVAL);
|
|
|
|
r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = netlink_message_read_internal(m, type, &attr_data, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
else if ((size_t)r < sizeof(struct in6_addr))
|
|
return -EIO;
|
|
|
|
if (data)
|
|
memcpy(data, attr_data, sizeof(struct in6_addr));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int netlink_container_parse(sd_netlink_message *m,
|
|
struct netlink_container *container,
|
|
int count,
|
|
struct rtattr *rta,
|
|
unsigned int rt_len) {
|
|
_cleanup_free_ struct netlink_attribute *attributes = NULL;
|
|
|
|
attributes = new0(struct netlink_attribute, count);
|
|
if (!attributes)
|
|
return -ENOMEM;
|
|
|
|
for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) {
|
|
unsigned short type;
|
|
|
|
type = RTA_TYPE(rta);
|
|
|
|
/* if the kernel is newer than the headers we used
|
|
when building, we ignore out-of-range attributes */
|
|
if (type >= count)
|
|
continue;
|
|
|
|
if (attributes[type].offset != 0)
|
|
log_debug("rtnl: message parse - overwriting repeated attribute");
|
|
|
|
attributes[type].offset = (uint8_t *) rta - (uint8_t *) m->hdr;
|
|
attributes[type].nested = RTA_FLAGS(rta) & NLA_F_NESTED;
|
|
attributes[type].net_byteorder = RTA_FLAGS(rta) & NLA_F_NET_BYTEORDER;
|
|
}
|
|
|
|
container->attributes = TAKE_PTR(attributes);
|
|
container->n_attributes = count;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short type_id) {
|
|
const NLType *nl_type;
|
|
const NLTypeSystem *type_system;
|
|
void *container;
|
|
uint16_t type;
|
|
size_t size;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL);
|
|
|
|
r = type_system_get_type(m->containers[m->n_containers].type_system,
|
|
&nl_type,
|
|
type_id);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
type = type_get_type(nl_type);
|
|
|
|
if (type == NETLINK_TYPE_NESTED) {
|
|
r = type_system_get_type_system(m->containers[m->n_containers].type_system,
|
|
&type_system,
|
|
type_id);
|
|
if (r < 0)
|
|
return r;
|
|
} else if (type == NETLINK_TYPE_UNION) {
|
|
const NLTypeSystemUnion *type_system_union;
|
|
|
|
r = type_system_get_type_system_union(m->containers[m->n_containers].type_system,
|
|
&type_system_union,
|
|
type_id);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
switch (type_system_union->match_type) {
|
|
case NL_MATCH_SIBLING:
|
|
{
|
|
const char *key;
|
|
|
|
r = sd_netlink_message_read_string(m, type_system_union->match, &key);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = type_system_union_get_type_system(type_system_union,
|
|
&type_system,
|
|
key);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
break;
|
|
}
|
|
case NL_MATCH_PROTOCOL:
|
|
{
|
|
int family;
|
|
|
|
r = sd_rtnl_message_get_family(m, &family);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = type_system_union_protocol_get_type_system(type_system_union,
|
|
&type_system,
|
|
family);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
break;
|
|
}
|
|
default:
|
|
assert_not_reached("sd-netlink: invalid type system union type");
|
|
}
|
|
} else
|
|
return -EINVAL;
|
|
|
|
r = netlink_message_read_internal(m, type_id, &container, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
else
|
|
size = (size_t)r;
|
|
|
|
m->n_containers++;
|
|
|
|
r = netlink_container_parse(m,
|
|
&m->containers[m->n_containers],
|
|
type_system_get_count(type_system),
|
|
container,
|
|
size);
|
|
if (r < 0) {
|
|
m->n_containers--;
|
|
return r;
|
|
}
|
|
|
|
m->containers[m->n_containers].type_system = type_system;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_exit_container(sd_netlink_message *m) {
|
|
assert_return(m, -EINVAL);
|
|
assert_return(m->sealed, -EINVAL);
|
|
assert_return(m->n_containers > 0, -EINVAL);
|
|
|
|
m->containers[m->n_containers].attributes = mfree(m->containers[m->n_containers].attributes);
|
|
m->containers[m->n_containers].type_system = NULL;
|
|
|
|
m->n_containers--;
|
|
|
|
return 0;
|
|
}
|
|
|
|
uint32_t rtnl_message_get_serial(sd_netlink_message *m) {
|
|
assert(m);
|
|
assert(m->hdr);
|
|
|
|
return m->hdr->nlmsg_seq;
|
|
}
|
|
|
|
int sd_netlink_message_is_error(sd_netlink_message *m) {
|
|
assert_return(m, 0);
|
|
assert_return(m->hdr, 0);
|
|
|
|
return m->hdr->nlmsg_type == NLMSG_ERROR;
|
|
}
|
|
|
|
int sd_netlink_message_get_errno(sd_netlink_message *m) {
|
|
struct nlmsgerr *err;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(m->hdr, -EINVAL);
|
|
|
|
if (!sd_netlink_message_is_error(m))
|
|
return 0;
|
|
|
|
err = NLMSG_DATA(m->hdr);
|
|
|
|
return err->error;
|
|
}
|
|
|
|
int sd_netlink_message_rewind(sd_netlink_message *m) {
|
|
const NLType *nl_type;
|
|
const NLTypeSystem *type_system_root;
|
|
uint16_t type;
|
|
size_t size;
|
|
unsigned i;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
|
|
/* don't allow appending to message once parsed */
|
|
if (!m->sealed)
|
|
rtnl_message_seal(m);
|
|
|
|
type_system_root = type_system_get_root(m->protocol);
|
|
|
|
for (i = 1; i <= m->n_containers; i++)
|
|
m->containers[i].attributes = mfree(m->containers[i].attributes);
|
|
|
|
m->n_containers = 0;
|
|
|
|
if (m->containers[0].attributes)
|
|
/* top-level attributes have already been parsed */
|
|
return 0;
|
|
|
|
assert(m->hdr);
|
|
|
|
r = type_system_get_type(type_system_root, &nl_type, m->hdr->nlmsg_type);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
type = type_get_type(nl_type);
|
|
size = type_get_size(nl_type);
|
|
|
|
if (type == NETLINK_TYPE_NESTED) {
|
|
const NLTypeSystem *type_system;
|
|
|
|
type_get_type_system(nl_type, &type_system);
|
|
|
|
m->containers[0].type_system = type_system;
|
|
|
|
r = netlink_container_parse(m,
|
|
&m->containers[m->n_containers],
|
|
type_system_get_count(type_system),
|
|
(struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + NLMSG_ALIGN(size)),
|
|
NLMSG_PAYLOAD(m->hdr, size));
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void rtnl_message_seal(sd_netlink_message *m) {
|
|
assert(m);
|
|
assert(!m->sealed);
|
|
|
|
m->sealed = true;
|
|
}
|
|
|
|
sd_netlink_message *sd_netlink_message_next(sd_netlink_message *m) {
|
|
assert_return(m, NULL);
|
|
|
|
return m->next;
|
|
}
|