int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type) {
_cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
const NLType *nl_type;
size_t size;
int r;
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;
}
static int genl_message_new(sd_netlink *nl, sd_genl_family family, uint16_t nlmsg_type, uint8_t cmd, sd_netlink_message **ret) {
int r;
struct genlmsghdr *genl;
const NLType *genl_cmd_type, *nl_type;
const NLTypeSystem *type_system;
size_t size;
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
assert_return(nl->protocol == NETLINK_GENERIC, -EINVAL);
r = type_system_get_type(&genl_family_type_system_root, &genl_cmd_type, family);
if (r < 0)
return r;
r = message_new_empty(nl, &m);
if (r < 0)
return r;
size = NLMSG_SPACE(sizeof(struct genlmsghdr));
m->hdr = malloc0(size);
if (!m->hdr)
return -ENOMEM;
m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
type_get_type_system(genl_cmd_type, &type_system);
r = type_system_get_type(type_system, &nl_type, cmd);
if (r < 0)
return r;
m->hdr->nlmsg_len = size;
m->hdr->nlmsg_type = nlmsg_type;
type_get_type_system(nl_type, &m->containers[0].type_system);
genl = NLMSG_DATA(m->hdr);
genl->cmd = cmd;
genl->version = genl_families[family].version;
*ret = TAKE_PTR(m);
return 0;
}
int sd_netlink_message_rewind(sd_netlink_message *m) {
const NLType *nl_type;
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);
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;
}
