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/* SPDX-License-Identifier: LGPL-2.1+ */
#include "sd-netlink.h"
#include "memory-util.h"
#include "netlink-internal.h"
#include "netlink-util.h"
#include "strv.h"
int rtnl_set_link_name(sd_netlink **rtnl, int ifindex, const char *name) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL;
int r;
assert(rtnl);
assert(ifindex > 0);
assert(name);
if (!ifname_valid(name))
return -EINVAL;
if (!*rtnl) {
r = sd_netlink_open(rtnl);
if (r < 0)
return r;
}
r = sd_rtnl_message_new_link(*rtnl, &message, RTM_SETLINK, ifindex);
if (r < 0)
return r;
r = sd_netlink_message_append_string(message, IFLA_IFNAME, name);
if (r < 0)
return r;
r = sd_netlink_call(*rtnl, message, 0, NULL);
if (r < 0)
return r;
return 0;
}
int rtnl_set_link_properties(sd_netlink **rtnl, int ifindex, const char *alias,
const struct ether_addr *mac, uint32_t mtu) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL;
int r;
assert(rtnl);
assert(ifindex > 0);
if (!alias && !mac && mtu == 0)
return 0;
if (!*rtnl) {
r = sd_netlink_open(rtnl);
if (r < 0)
return r;
}
r = sd_rtnl_message_new_link(*rtnl, &message, RTM_SETLINK, ifindex);
if (r < 0)
return r;
if (alias) {
r = sd_netlink_message_append_string(message, IFLA_IFALIAS, alias);
if (r < 0)
return r;
}
if (mac) {
r = sd_netlink_message_append_ether_addr(message, IFLA_ADDRESS, mac);
if (r < 0)
return r;
}
if (mtu != 0) {
r = sd_netlink_message_append_u32(message, IFLA_MTU, mtu);
if (r < 0)
return r;
}
r = sd_netlink_call(*rtnl, message, 0, NULL);
if (r < 0)
return r;
return 0;
}
int rtnl_set_link_alternative_names(sd_netlink **rtnl, int ifindex, char * const *alternative_names) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL;
int r;
assert(rtnl);
assert(ifindex > 0);
if (strv_isempty(alternative_names))
return 0;
if (!*rtnl) {
r = sd_netlink_open(rtnl);
if (r < 0)
return r;
}
r = sd_rtnl_message_new_link(*rtnl, &message, RTM_NEWLINKPROP, ifindex);
if (r < 0)
return r;
r = sd_netlink_message_open_container(message, IFLA_PROP_LIST);
if (r < 0)
return r;
r = sd_netlink_message_append_strv(message, IFLA_ALT_IFNAME, alternative_names);
if (r < 0)
return r;
r = sd_netlink_message_close_container(message);
if (r < 0)
return r;
r = sd_netlink_call(*rtnl, message, 0, NULL);
if (r < 0)
return r;
return 0;
}
int rtnl_set_link_alternative_names_by_ifname(sd_netlink **rtnl, const char *ifname, char * const *alternative_names) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL;
int r;
assert(rtnl);
assert(ifname);
if (strv_isempty(alternative_names))
return 0;
if (!*rtnl) {
r = sd_netlink_open(rtnl);
if (r < 0)
return r;
}
r = sd_rtnl_message_new_link(*rtnl, &message, RTM_NEWLINKPROP, 0);
if (r < 0)
return r;
r = sd_netlink_message_append_string(message, IFLA_IFNAME, ifname);
if (r < 0)
return r;
r = sd_netlink_message_open_container(message, IFLA_PROP_LIST);
if (r < 0)
return r;
r = sd_netlink_message_append_strv(message, IFLA_ALT_IFNAME, alternative_names);
if (r < 0)
return r;
r = sd_netlink_message_close_container(message);
if (r < 0)
return r;
r = sd_netlink_call(*rtnl, message, 0, NULL);
if (r < 0)
return r;
return 0;
}
int rtnl_resolve_link_alternative_name(sd_netlink **rtnl, const char *name) {
_cleanup_(sd_netlink_unrefp) sd_netlink *our_rtnl = NULL;
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL, *reply = NULL;
int r, ret;
assert(name);
if (!rtnl)
rtnl = &our_rtnl;
if (!*rtnl) {
r = sd_netlink_open(rtnl);
if (r < 0)
return r;
}
r = sd_rtnl_message_new_link(*rtnl, &message, RTM_GETLINK, 0);
if (r < 0)
return r;
r = sd_netlink_message_append_string(message, IFLA_ALT_IFNAME, name);
if (r < 0)
return r;
r = sd_netlink_call(*rtnl, message, 0, &reply);
if (r == -EINVAL)
return -ENODEV; /* The device doesn't exist */
if (r < 0)
return r;
r = sd_rtnl_message_link_get_ifindex(reply, &ret);
if (r < 0)
return r;
assert(ret > 0);
return ret;
}
int rtnl_get_link_iftype(sd_netlink **rtnl, int ifindex, unsigned short *ret) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL, *reply = NULL;
int r;
if (!*rtnl) {
r = sd_netlink_open(rtnl);
if (r < 0)
return r;
}
r = sd_rtnl_message_new_link(*rtnl, &message, RTM_GETLINK, ifindex);
if (r < 0)
return r;
r = sd_netlink_call(*rtnl, message, 0, &reply);
if (r == -EINVAL)
return -ENODEV; /* The device does not exist */
if (r < 0)
return r;
return sd_rtnl_message_link_get_type(reply, ret);
}
int rtnl_message_new_synthetic_error(sd_netlink *rtnl, int error, uint32_t serial, sd_netlink_message **ret) {
struct nlmsgerr *err;
int r;
assert(error <= 0);
r = message_new(rtnl, ret, NLMSG_ERROR);
if (r < 0)
return r;
(*ret)->hdr->nlmsg_seq = serial;
err = NLMSG_DATA((*ret)->hdr);
err->error = error;
return 0;
}
int rtnl_log_parse_error(int r) {
return log_error_errno(r, "Failed to parse netlink message: %m");
}
int rtnl_log_create_error(int r) {
return log_error_errno(r, "Failed to create netlink message: %m");
}
void rtattr_append_attribute_internal(struct rtattr *rta, unsigned short type, const void *data, size_t data_length) {
size_t padding_length;
uint8_t *padding;
assert(rta);
assert(!data || data_length > 0);
/* fill in the attribute */
rta->rta_type = type;
rta->rta_len = RTA_LENGTH(data_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 *) rta + RTA_SPACE(data_length) - padding;
memzero(padding, padding_length);
}
int rtattr_append_attribute(struct rtattr **rta, unsigned short type, const void *data, size_t data_length) {
struct rtattr *new_rta, *sub_rta;
size_t message_length;
assert(rta);
assert(!data || data_length > 0);
/* get the new message size (with padding at the end) */
message_length = RTA_ALIGN(rta ? (*rta)->rta_len : 0) + RTA_SPACE(data_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_rta = realloc(*rta, message_length);
if (!new_rta)
return -ENOMEM;
*rta = new_rta;
/* get pointer to the attribute we are about to add */
sub_rta = (struct rtattr *) ((uint8_t *) *rta + RTA_ALIGN((*rta)->rta_len));
rtattr_append_attribute_internal(sub_rta, type, data, data_length);
/* update rta_len */
(*rta)->rta_len = message_length;
return 0;
}
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