1254 lines
37 KiB
C
1254 lines
37 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <netinet/in.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include "sd-netlink.h"
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#include "alloc-util.h"
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#include "format-util.h"
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#include "memory-util.h"
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#include "netlink-internal.h"
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#include "netlink-types.h"
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#include "netlink-util.h"
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#include "socket-util.h"
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#include "strv.h"
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#define GET_CONTAINER(m, i) ((struct rtattr*)((uint8_t*)(m)->hdr + (m)->containers[i].offset))
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#define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK)
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#define RTA_FLAGS(rta) ((rta)->rta_type & ~NLA_TYPE_MASK)
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int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret) {
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sd_netlink_message *m;
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assert_return(ret, -EINVAL);
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/* Note that 'rtnl' is currently unused, if we start using it internally
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we must take care to avoid problems due to mutual references between
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buses and their queued messages. See sd-bus.
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*/
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m = new(sd_netlink_message, 1);
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if (!m)
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return -ENOMEM;
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*m = (sd_netlink_message) {
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.n_ref = 1,
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.protocol = rtnl->protocol,
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.sealed = false,
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};
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*ret = m;
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return 0;
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}
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int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
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const NLType *nl_type;
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size_t size;
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int r;
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assert_return(rtnl, -EINVAL);
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r = type_system_root_get_type(rtnl, &nl_type, type);
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if (r < 0)
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return r;
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if (type_get_type(nl_type) != NETLINK_TYPE_NESTED)
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return -EINVAL;
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r = message_new_empty(rtnl, &m);
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if (r < 0)
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return r;
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size = NLMSG_SPACE(type_get_size(nl_type));
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assert(size >= sizeof(struct nlmsghdr));
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m->hdr = malloc0(size);
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if (!m->hdr)
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return -ENOMEM;
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m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
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type_get_type_system(nl_type, &m->containers[0].type_system);
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m->hdr->nlmsg_len = size;
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m->hdr->nlmsg_type = type;
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*ret = TAKE_PTR(m);
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return 0;
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}
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int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) {
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(IN_SET(m->hdr->nlmsg_type,
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RTM_GETLINK, RTM_GETLINKPROP, RTM_GETADDR, RTM_GETROUTE, RTM_GETNEIGH,
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RTM_GETRULE, RTM_GETADDRLABEL, RTM_GETNEXTHOP), -EINVAL);
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SET_FLAG(m->hdr->nlmsg_flags, NLM_F_DUMP, dump);
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return 0;
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}
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DEFINE_TRIVIAL_REF_FUNC(sd_netlink_message, sd_netlink_message);
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sd_netlink_message *sd_netlink_message_unref(sd_netlink_message *m) {
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while (m && --m->n_ref == 0) {
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unsigned i;
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free(m->hdr);
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for (i = 0; i <= m->n_containers; i++)
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free(m->containers[i].attributes);
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sd_netlink_message *t = m;
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m = m->next;
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free(t);
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}
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return NULL;
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}
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int sd_netlink_message_get_type(const sd_netlink_message *m, uint16_t *type) {
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assert_return(m, -EINVAL);
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assert_return(type, -EINVAL);
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*type = m->hdr->nlmsg_type;
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return 0;
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}
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int sd_netlink_message_set_flags(sd_netlink_message *m, uint16_t flags) {
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assert_return(m, -EINVAL);
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assert_return(flags, -EINVAL);
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m->hdr->nlmsg_flags = flags;
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return 0;
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}
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int sd_netlink_message_is_broadcast(const sd_netlink_message *m) {
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assert_return(m, -EINVAL);
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return m->broadcast;
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}
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/* If successful the updated message will be correctly aligned, if
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unsuccessful the old message is untouched. */
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static int add_rtattr(sd_netlink_message *m, unsigned short type, const void *data, size_t data_length) {
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size_t message_length;
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struct nlmsghdr *new_hdr;
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struct rtattr *rta;
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unsigned i;
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int offset;
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assert(m);
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assert(m->hdr);
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assert(!m->sealed);
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assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len);
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assert(!data || data_length > 0);
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/* get the new message size (with padding at the end) */
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message_length = m->hdr->nlmsg_len + RTA_SPACE(data_length);
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/* buffer should be smaller than both one page or 8K to be accepted by the kernel */
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if (message_length > MIN(page_size(), 8192UL))
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return -ENOBUFS;
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/* realloc to fit the new attribute */
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new_hdr = realloc(m->hdr, message_length);
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if (!new_hdr)
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return -ENOMEM;
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m->hdr = new_hdr;
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/* get pointer to the attribute we are about to add */
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rta = (struct rtattr *) ((uint8_t *) m->hdr + m->hdr->nlmsg_len);
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rtattr_append_attribute_internal(rta, type, data, data_length);
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/* if we are inside containers, extend them */
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for (i = 0; i < m->n_containers; i++)
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GET_CONTAINER(m, i)->rta_len += RTA_SPACE(data_length);
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/* update message size */
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offset = m->hdr->nlmsg_len;
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m->hdr->nlmsg_len = message_length;
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/* return old message size */
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return offset;
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}
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static int message_attribute_has_type(sd_netlink_message *m, size_t *out_size, uint16_t attribute_type, uint16_t data_type) {
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const NLType *type;
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int r;
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assert(m);
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r = type_system_get_type(m->containers[m->n_containers].type_system, &type, attribute_type);
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if (r < 0)
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return r;
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if (type_get_type(type) != data_type)
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return -EINVAL;
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if (out_size)
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*out_size = type_get_size(type);
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return 0;
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}
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int sd_netlink_message_append_string(sd_netlink_message *m, unsigned short type, const char *data) {
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size_t length, size;
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int r;
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assert_return(m, -EINVAL);
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assert_return(!m->sealed, -EPERM);
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assert_return(data, -EINVAL);
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r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_STRING);
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if (r < 0)
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return r;
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if (size) {
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length = strnlen(data, size+1);
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if (length > size)
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return -EINVAL;
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} else
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length = strlen(data);
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r = add_rtattr(m, type, data, length + 1);
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if (r < 0)
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return r;
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return 0;
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}
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int sd_netlink_message_append_strv(sd_netlink_message *m, unsigned short type, char * const *data) {
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size_t length, size;
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char * const *p;
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int r;
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assert_return(m, -EINVAL);
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assert_return(!m->sealed, -EPERM);
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assert_return(data, -EINVAL);
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r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_STRING);
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if (r < 0)
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return r;
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STRV_FOREACH(p, data) {
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if (size) {
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length = strnlen(*p, size+1);
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if (length > size)
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return -EINVAL;
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} else
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length = strlen(*p);
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r = add_rtattr(m, type, *p, length + 1);
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if (r < 0)
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return r;
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}
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return 0;
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}
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int sd_netlink_message_append_flag(sd_netlink_message *m, unsigned short type) {
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size_t size;
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int r;
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assert_return(m, -EINVAL);
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assert_return(!m->sealed, -EPERM);
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r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_FLAG);
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if (r < 0)
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return r;
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r = add_rtattr(m, type, NULL, 0);
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if (r < 0)
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return r;
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return 0;
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}
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int sd_netlink_message_append_u8(sd_netlink_message *m, unsigned short type, uint8_t data) {
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int r;
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assert_return(m, -EINVAL);
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assert_return(!m->sealed, -EPERM);
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r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8);
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if (r < 0)
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return r;
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r = add_rtattr(m, type, &data, sizeof(uint8_t));
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if (r < 0)
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return r;
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return 0;
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}
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int sd_netlink_message_append_u16(sd_netlink_message *m, unsigned short type, uint16_t data) {
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int r;
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assert_return(m, -EINVAL);
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assert_return(!m->sealed, -EPERM);
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r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16);
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if (r < 0)
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return r;
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r = add_rtattr(m, type, &data, sizeof(uint16_t));
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if (r < 0)
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return r;
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return 0;
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}
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int sd_netlink_message_append_u32(sd_netlink_message *m, unsigned short type, uint32_t data) {
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int r;
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assert_return(m, -EINVAL);
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assert_return(!m->sealed, -EPERM);
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r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32);
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if (r < 0)
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return r;
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r = add_rtattr(m, type, &data, sizeof(uint32_t));
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if (r < 0)
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return r;
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return 0;
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}
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int sd_netlink_message_append_u64(sd_netlink_message *m, unsigned short type, uint64_t data) {
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int r;
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assert_return(m, -EINVAL);
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assert_return(!m->sealed, -EPERM);
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r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U64);
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if (r < 0)
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return r;
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r = add_rtattr(m, type, &data, sizeof(uint64_t));
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if (r < 0)
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return r;
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return 0;
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}
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int sd_netlink_message_append_s8(sd_netlink_message *m, unsigned short type, int8_t data) {
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int r;
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assert_return(m, -EINVAL);
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assert_return(!m->sealed, -EPERM);
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r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_S8);
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if (r < 0)
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return r;
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r = add_rtattr(m, type, &data, sizeof(int8_t));
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if (r < 0)
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return r;
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return 0;
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}
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int sd_netlink_message_append_s16(sd_netlink_message *m, unsigned short type, int16_t data) {
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int r;
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assert_return(m, -EINVAL);
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assert_return(!m->sealed, -EPERM);
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r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_S16);
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if (r < 0)
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return r;
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r = add_rtattr(m, type, &data, sizeof(int16_t));
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if (r < 0)
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return r;
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return 0;
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}
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int sd_netlink_message_append_s32(sd_netlink_message *m, unsigned short type, int32_t data) {
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int r;
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assert_return(m, -EINVAL);
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assert_return(!m->sealed, -EPERM);
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r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_S32);
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if (r < 0)
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return r;
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r = add_rtattr(m, type, &data, sizeof(int32_t));
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if (r < 0)
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return r;
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return 0;
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}
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int sd_netlink_message_append_s64(sd_netlink_message *m, unsigned short type, int64_t data) {
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int r;
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assert_return(m, -EINVAL);
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assert_return(!m->sealed, -EPERM);
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r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_S64);
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if (r < 0)
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return r;
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r = add_rtattr(m, type, &data, sizeof(int64_t));
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if (r < 0)
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return r;
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return 0;
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}
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int sd_netlink_message_append_data(sd_netlink_message *m, unsigned short type, const void *data, size_t len) {
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int r;
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assert_return(m, -EINVAL);
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assert_return(!m->sealed, -EPERM);
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r = add_rtattr(m, type, data, len);
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if (r < 0)
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return r;
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return 0;
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}
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int netlink_message_append_in_addr_union(sd_netlink_message *m, unsigned short type, int family, const union in_addr_union *data) {
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int r;
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assert_return(m, -EINVAL);
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assert_return(!m->sealed, -EPERM);
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assert_return(data, -EINVAL);
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assert_return(IN_SET(family, AF_INET, AF_INET6), -EINVAL);
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r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR);
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if (r < 0)
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return r;
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r = add_rtattr(m, type, data, FAMILY_ADDRESS_SIZE(family));
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if (r < 0)
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return r;
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return 0;
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}
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int sd_netlink_message_append_in_addr(sd_netlink_message *m, unsigned short type, const struct in_addr *data) {
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return netlink_message_append_in_addr_union(m, type, AF_INET, (const union in_addr_union *) data);
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}
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int sd_netlink_message_append_in6_addr(sd_netlink_message *m, unsigned short type, const struct in6_addr *data) {
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return netlink_message_append_in_addr_union(m, type, AF_INET6, (const union in_addr_union *) data);
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}
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int netlink_message_append_sockaddr_union(sd_netlink_message *m, unsigned short type, const union sockaddr_union *data) {
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int r;
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assert_return(m, -EINVAL);
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assert_return(!m->sealed, -EPERM);
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assert_return(data, -EINVAL);
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assert_return(IN_SET(data->sa.sa_family, AF_INET, AF_INET6), -EINVAL);
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r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_SOCKADDR);
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if (r < 0)
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return r;
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r = add_rtattr(m, type, data, data->sa.sa_family == AF_INET ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6));
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if (r < 0)
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return r;
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return 0;
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}
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int sd_netlink_message_append_sockaddr_in(sd_netlink_message *m, unsigned short type, const struct sockaddr_in *data) {
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return netlink_message_append_sockaddr_union(m, type, (const union sockaddr_union *) data);
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}
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int sd_netlink_message_append_sockaddr_in6(sd_netlink_message *m, unsigned short type, const struct sockaddr_in6 *data) {
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return netlink_message_append_sockaddr_union(m, type, (const union sockaddr_union *) data);
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}
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int sd_netlink_message_append_ether_addr(sd_netlink_message *m, unsigned short type, const struct ether_addr *data) {
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int r;
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assert_return(m, -EINVAL);
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assert_return(!m->sealed, -EPERM);
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assert_return(data, -EINVAL);
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r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR);
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if (r < 0)
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return r;
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r = add_rtattr(m, type, data, ETH_ALEN);
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if (r < 0)
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return r;
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return 0;
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}
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int sd_netlink_message_append_cache_info(sd_netlink_message *m, unsigned short type, const struct ifa_cacheinfo *info) {
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int r;
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assert_return(m, -EINVAL);
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assert_return(!m->sealed, -EPERM);
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assert_return(info, -EINVAL);
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r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO);
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if (r < 0)
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return r;
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r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo));
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if (r < 0)
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return r;
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return 0;
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}
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int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type) {
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size_t size;
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int r;
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assert_return(m, -EINVAL);
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assert_return(!m->sealed, -EPERM);
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/* m->containers[m->n_containers + 1] is accessed both in read and write. Prevent access out of bound */
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assert_return(m->n_containers < (RTNL_CONTAINER_DEPTH - 1), -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);
|
|
assert_return(m->n_containers < (RTNL_CONTAINER_DEPTH - 1), -ERANGE);
|
|
|
|
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 < (RTNL_CONTAINER_DEPTH - 1), -ERANGE);
|
|
|
|
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);
|
|
|
|
if (!m->containers[m->n_containers].attributes)
|
|
return -ENODATA;
|
|
|
|
if (type >= m->containers[m->n_containers].n_attributes)
|
|
return -ENODATA;
|
|
|
|
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(sd_netlink_message *m, unsigned short type, size_t size, void *data) {
|
|
void *attr_data;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
|
|
r = netlink_message_read_internal(m, type, &attr_data, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if ((size_t) r < size)
|
|
return -EIO;
|
|
|
|
if (data)
|
|
memcpy(data, attr_data, size);
|
|
|
|
return r;
|
|
}
|
|
|
|
int sd_netlink_message_read_string_strdup(sd_netlink_message *m, unsigned short type, char **data) {
|
|
void *attr_data;
|
|
char *str;
|
|
int r;
|
|
|
|
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;
|
|
|
|
if (data) {
|
|
str = strndup(attr_data, r);
|
|
if (!str)
|
|
return -ENOMEM;
|
|
|
|
*data = str;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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 netlink_message_read_in_addr_union(sd_netlink_message *m, unsigned short type, int family, union in_addr_union *data) {
|
|
void *attr_data;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(IN_SET(family, AF_INET, AF_INET6), -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 < FAMILY_ADDRESS_SIZE(family))
|
|
return -EIO;
|
|
|
|
if (data)
|
|
memcpy(data, attr_data, FAMILY_ADDRESS_SIZE(family));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_netlink_message_read_in_addr(sd_netlink_message *m, unsigned short type, struct in_addr *data) {
|
|
union in_addr_union u;
|
|
int r;
|
|
|
|
r = netlink_message_read_in_addr_union(m, type, AF_INET, &u);
|
|
if (r >= 0 && data)
|
|
*data = u.in;
|
|
|
|
return r;
|
|
}
|
|
|
|
int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type, struct in6_addr *data) {
|
|
union in_addr_union u;
|
|
int r;
|
|
|
|
r = netlink_message_read_in_addr_union(m, type, AF_INET6, &u);
|
|
if (r >= 0 && data)
|
|
*data = u.in6;
|
|
|
|
return r;
|
|
}
|
|
|
|
int sd_netlink_message_read_strv(sd_netlink_message *m, unsigned short container_type, unsigned short type_id, char ***ret) {
|
|
_cleanup_strv_free_ char **s = NULL;
|
|
const NLTypeSystem *type_system;
|
|
const NLType *nl_type;
|
|
struct rtattr *rta;
|
|
void *container;
|
|
size_t rt_len;
|
|
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,
|
|
container_type);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (type_get_type(nl_type) != NETLINK_TYPE_NESTED)
|
|
return -EINVAL;
|
|
|
|
r = type_system_get_type_system(m->containers[m->n_containers].type_system,
|
|
&type_system,
|
|
container_type);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = type_system_get_type(type_system, &nl_type, type_id);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (type_get_type(nl_type) != NETLINK_TYPE_STRING)
|
|
return -EINVAL;
|
|
|
|
r = netlink_message_read_internal(m, container_type, &container, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
rt_len = (size_t) r;
|
|
rta = container;
|
|
|
|
/* RTA_OK() macro compares with rta->rt_len, which is unsigned short, and
|
|
* LGTM.com analysis does not like the type difference. Hence, here we
|
|
* introduce an unsigned short variable as a workaround. */
|
|
unsigned short len = rt_len;
|
|
for (; RTA_OK(rta, len); rta = RTA_NEXT(rta, len)) {
|
|
unsigned short type;
|
|
|
|
type = RTA_TYPE(rta);
|
|
if (type != type_id)
|
|
continue;
|
|
|
|
r = strv_extend(&s, RTA_DATA(rta));
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
*ret = TAKE_PTR(s);
|
|
return 0;
|
|
}
|
|
|
|
static int netlink_container_parse(sd_netlink_message *m,
|
|
struct netlink_container *container,
|
|
struct rtattr *rta,
|
|
size_t rt_len) {
|
|
_cleanup_free_ struct netlink_attribute *attributes = NULL;
|
|
size_t n_allocated = 0;
|
|
|
|
/* RTA_OK() macro compares with rta->rt_len, which is unsigned short, and
|
|
* LGTM.com analysis does not like the type difference. Hence, here we
|
|
* introduce an unsigned short variable as a workaround. */
|
|
unsigned short len = rt_len;
|
|
for (; RTA_OK(rta, len); rta = RTA_NEXT(rta, len)) {
|
|
unsigned short type;
|
|
|
|
type = RTA_TYPE(rta);
|
|
|
|
if (!GREEDY_REALLOC0(attributes, n_allocated, type + 1))
|
|
return -ENOMEM;
|
|
|
|
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 = n_allocated;
|
|
|
|
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 - 1), -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;
|
|
|
|
size = (size_t) r;
|
|
m->n_containers++;
|
|
|
|
r = netlink_container_parse(m,
|
|
&m->containers[m->n_containers],
|
|
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_enter_array(sd_netlink_message *m, unsigned short type_id) {
|
|
void *container;
|
|
size_t size;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(m->n_containers < (RTNL_CONTAINER_DEPTH - 1), -EINVAL);
|
|
|
|
r = netlink_message_read_internal(m, type_id, &container, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
size = (size_t) r;
|
|
m->n_containers++;
|
|
|
|
r = netlink_container_parse(m,
|
|
&m->containers[m->n_containers],
|
|
container,
|
|
size);
|
|
if (r < 0) {
|
|
m->n_containers--;
|
|
return r;
|
|
}
|
|
|
|
m->containers[m->n_containers].type_system = m->containers[m->n_containers - 1].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(const 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(const 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;
|
|
}
|
|
|
|
static int netlink_message_parse_error(sd_netlink_message *m) {
|
|
struct nlmsgerr *err = NLMSG_DATA(m->hdr);
|
|
size_t hlen = sizeof(struct nlmsgerr);
|
|
|
|
/* no TLVs, nothing to do here */
|
|
if (!(m->hdr->nlmsg_flags & NLM_F_ACK_TLVS))
|
|
return 0;
|
|
|
|
/* if NLM_F_CAPPED is set then the inner err msg was capped */
|
|
if (!(m->hdr->nlmsg_flags & NLM_F_CAPPED))
|
|
hlen += err->msg.nlmsg_len - sizeof(struct nlmsghdr);
|
|
|
|
if (m->hdr->nlmsg_len <= NLMSG_SPACE(hlen))
|
|
return 0;
|
|
|
|
return netlink_container_parse(m,
|
|
&m->containers[m->n_containers],
|
|
(struct rtattr*)((uint8_t*) NLMSG_DATA(m->hdr) + hlen),
|
|
NLMSG_PAYLOAD(m->hdr, hlen));
|
|
}
|
|
|
|
int sd_netlink_message_rewind(sd_netlink_message *m, sd_netlink *genl) {
|
|
const NLType *nl_type;
|
|
uint16_t type;
|
|
size_t size;
|
|
unsigned i;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(genl || m->protocol != NETLINK_GENERIC, -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_root_get_type(genl, &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;
|
|
|
|
if (sd_netlink_message_is_error(m))
|
|
r = netlink_message_parse_error(m);
|
|
else
|
|
r = netlink_container_parse(m,
|
|
&m->containers[m->n_containers],
|
|
(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;
|
|
}
|