| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <netinet/in.h> |
| #include <stdbool.h> |
| #include <unistd.h> |
| |
| #include "sd-netlink.h" |
| |
| #include "alloc-util.h" |
| #include "format-util.h" |
| #include "memory-util.h" |
| #include "netlink-internal.h" |
| #include "netlink-types.h" |
| #include "netlink-util.h" |
| #include "socket-util.h" |
| #include "strv.h" |
| |
| #define GET_CONTAINER(m, i) ((struct rtattr*)((uint8_t*)(m)->hdr + (m)->containers[i].offset)) |
| |
| #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 *nl, sd_netlink_message **ret) { |
| sd_netlink_message *m; |
| |
| assert(nl); |
| assert(ret); |
| |
| /* Note that 'nl' 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 = new(sd_netlink_message, 1); |
| if (!m) |
| return -ENOMEM; |
| |
| *m = (sd_netlink_message) { |
| .n_ref = 1, |
| .protocol = nl->protocol, |
| .sealed = false, |
| }; |
| |
| *ret = m; |
| return 0; |
| } |
| |
| int message_new_full( |
| sd_netlink *nl, |
| uint16_t nlmsg_type, |
| const NLAPolicySet *policy_set, |
| size_t header_size, |
| sd_netlink_message **ret) { |
| |
| _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
| size_t size; |
| int r; |
| |
| assert(nl); |
| assert(policy_set); |
| assert(ret); |
| |
| size = NLMSG_SPACE(header_size); |
| assert(size >= sizeof(struct nlmsghdr)); |
| |
| r = message_new_empty(nl, &m); |
| if (r < 0) |
| return r; |
| |
| m->containers[0].policy_set = policy_set; |
| |
| m->hdr = malloc0(size); |
| if (!m->hdr) |
| return -ENOMEM; |
| |
| m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; |
| m->hdr->nlmsg_len = size; |
| m->hdr->nlmsg_type = nlmsg_type; |
| |
| *ret = TAKE_PTR(m); |
| return 0; |
| } |
| |
| int message_new(sd_netlink *nl, sd_netlink_message **ret, uint16_t nlmsg_type) { |
| const NLAPolicySet *policy_set; |
| size_t size; |
| int r; |
| |
| assert_return(nl, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| r = netlink_get_policy_set_and_header_size(nl, nlmsg_type, &policy_set, &size); |
| if (r < 0) |
| return r; |
| |
| return message_new_full(nl, nlmsg_type, policy_set, size, ret); |
| } |
| |
| int message_new_synthetic_error(sd_netlink *nl, int error, uint32_t serial, sd_netlink_message **ret) { |
| struct nlmsgerr *err; |
| int r; |
| |
| assert(error <= 0); |
| |
| r = message_new(nl, ret, NLMSG_ERROR); |
| if (r < 0) |
| return r; |
| |
| message_seal(*ret); |
| (*ret)->hdr->nlmsg_seq = serial; |
| |
| err = NLMSG_DATA((*ret)->hdr); |
| err->error = error; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_set_request_dump(sd_netlink_message *m, int dump) { |
| assert_return(m, -EINVAL); |
| assert_return(m->hdr, -EINVAL); |
| assert_return(m->protocol != NETLINK_ROUTE || |
| IN_SET(m->hdr->nlmsg_type, |
| RTM_GETLINK, RTM_GETLINKPROP, RTM_GETADDR, RTM_GETROUTE, RTM_GETNEIGH, |
| RTM_GETRULE, RTM_GETADDRLABEL, RTM_GETNEXTHOP, RTM_GETQDISC, RTM_GETTCLASS), |
| -EINVAL); |
| |
| SET_FLAG(m->hdr->nlmsg_flags, NLM_F_DUMP, dump); |
| |
| return 0; |
| } |
| |
| DEFINE_TRIVIAL_REF_FUNC(sd_netlink_message, sd_netlink_message); |
| |
| sd_netlink_message* sd_netlink_message_unref(sd_netlink_message *m) { |
| while (m && --m->n_ref == 0) { |
| unsigned i; |
| |
| free(m->hdr); |
| |
| for (i = 0; i <= m->n_containers; i++) |
| free(m->containers[i].attributes); |
| |
| sd_netlink_message *t = m; |
| m = m->next; |
| free(t); |
| } |
| |
| return NULL; |
| } |
| |
| int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *ret) { |
| assert_return(m, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| *ret = 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 != 0, -EINVAL); |
| |
| m->hdr->nlmsg_flags = flags; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_is_broadcast(sd_netlink_message *m) { |
| assert_return(m, -EINVAL); |
| |
| return m->multicast_group != 0; |
| } |
| |
| /* If successful the updated message will be correctly aligned, if unsuccessful the old message is untouched. */ |
| static int add_rtattr(sd_netlink_message *m, uint16_t attr_type, const void *data, size_t data_length) { |
| size_t message_length; |
| struct nlmsghdr *new_hdr; |
| struct rtattr *rta; |
| 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 > 0); |
| |
| /* get the new message size (with padding at the end) */ |
| message_length = m->hdr->nlmsg_len + 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_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 + m->hdr->nlmsg_len); |
| |
| rtattr_append_attribute_internal(rta, attr_type, data, data_length); |
| |
| /* if we are inside containers, extend them */ |
| for (unsigned i = 0; i < m->n_containers; i++) |
| GET_CONTAINER(m, i)->rta_len += RTA_SPACE(data_length); |
| |
| /* update message size */ |
| offset = m->hdr->nlmsg_len; |
| m->hdr->nlmsg_len = message_length; |
| |
| /* return old message size */ |
| return offset; |
| } |
| |
| static int message_attribute_has_type(sd_netlink_message *m, size_t *ret_size, uint16_t attr_type, NLAType type) { |
| const NLAPolicy *policy; |
| |
| assert(m); |
| |
| policy = policy_set_get_policy(m->containers[m->n_containers].policy_set, attr_type); |
| if (!policy) |
| return -EOPNOTSUPP; |
| |
| if (policy_get_type(policy) != type) |
| return -EINVAL; |
| |
| if (ret_size) |
| *ret_size = policy_get_size(policy); |
| return 0; |
| } |
| |
| int sd_netlink_message_append_string(sd_netlink_message *m, uint16_t attr_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, attr_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, attr_type, data, length + 1); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_strv(sd_netlink_message *m, uint16_t attr_type, const char* const *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, attr_type, NETLINK_TYPE_STRING); |
| if (r < 0) |
| return r; |
| |
| STRV_FOREACH(p, data) { |
| if (size) { |
| length = strnlen(*p, size+1); |
| if (length > size) |
| return -EINVAL; |
| } else |
| length = strlen(*p); |
| |
| r = add_rtattr(m, attr_type, *p, length + 1); |
| if (r < 0) |
| return r; |
| } |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_flag(sd_netlink_message *m, uint16_t attr_type) { |
| size_t size; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| |
| r = message_attribute_has_type(m, &size, attr_type, NETLINK_TYPE_FLAG); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, attr_type, NULL, 0); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_u8(sd_netlink_message *m, uint16_t attr_type, uint8_t data) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_U8); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, attr_type, &data, sizeof(uint8_t)); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_u16(sd_netlink_message *m, uint16_t attr_type, uint16_t data) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_U16); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, attr_type, &data, sizeof(uint16_t)); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_u32(sd_netlink_message *m, uint16_t attr_type, uint32_t data) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_U32); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, attr_type, &data, sizeof(uint32_t)); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_u64(sd_netlink_message *m, uint16_t attr_type, uint64_t data) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_U64); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, attr_type, &data, sizeof(uint64_t)); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_s8(sd_netlink_message *m, uint16_t attr_type, int8_t data) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_S8); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, attr_type, &data, sizeof(int8_t)); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_s16(sd_netlink_message *m, uint16_t attr_type, int16_t data) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_S16); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, attr_type, &data, sizeof(int16_t)); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_s32(sd_netlink_message *m, uint16_t attr_type, int32_t data) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_S32); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, attr_type, &data, sizeof(int32_t)); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_s64(sd_netlink_message *m, uint16_t attr_type, int64_t data) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_S64); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, attr_type, &data, sizeof(int64_t)); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_data(sd_netlink_message *m, uint16_t attr_type, const void *data, size_t len) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| |
| r = add_rtattr(m, attr_type, data, len); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_container_data( |
| sd_netlink_message *m, |
| uint16_t container_type, |
| uint16_t attr_type, |
| const void *data, |
| size_t len) { |
| |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| |
| r = sd_netlink_message_open_container(m, container_type); |
| if (r < 0) |
| return r; |
| |
| r = sd_netlink_message_append_data(m, attr_type, data, len); |
| if (r < 0) |
| return r; |
| |
| return sd_netlink_message_close_container(m); |
| } |
| |
| int netlink_message_append_in_addr_union(sd_netlink_message *m, uint16_t attr_type, int family, const union in_addr_union *data) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| assert_return(data, -EINVAL); |
| assert_return(IN_SET(family, AF_INET, AF_INET6), -EINVAL); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_IN_ADDR); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, attr_type, data, FAMILY_ADDRESS_SIZE(family)); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_in_addr(sd_netlink_message *m, uint16_t attr_type, const struct in_addr *data) { |
| return netlink_message_append_in_addr_union(m, attr_type, AF_INET, (const union in_addr_union *) data); |
| } |
| |
| int sd_netlink_message_append_in6_addr(sd_netlink_message *m, uint16_t attr_type, const struct in6_addr *data) { |
| return netlink_message_append_in_addr_union(m, attr_type, AF_INET6, (const union in_addr_union *) data); |
| } |
| |
| int netlink_message_append_sockaddr_union(sd_netlink_message *m, uint16_t attr_type, const union sockaddr_union *data) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| assert_return(data, -EINVAL); |
| assert_return(IN_SET(data->sa.sa_family, AF_INET, AF_INET6), -EINVAL); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_SOCKADDR); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, attr_type, data, data->sa.sa_family == AF_INET ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6)); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_sockaddr_in(sd_netlink_message *m, uint16_t attr_type, const struct sockaddr_in *data) { |
| return netlink_message_append_sockaddr_union(m, attr_type, (const union sockaddr_union *) data); |
| } |
| |
| int sd_netlink_message_append_sockaddr_in6(sd_netlink_message *m, uint16_t attr_type, const struct sockaddr_in6 *data) { |
| return netlink_message_append_sockaddr_union(m, attr_type, (const union sockaddr_union *) data); |
| } |
| |
| int sd_netlink_message_append_ether_addr(sd_netlink_message *m, uint16_t attr_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, attr_type, NETLINK_TYPE_ETHER_ADDR); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, attr_type, data, ETH_ALEN); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int netlink_message_append_hw_addr(sd_netlink_message *m, uint16_t attr_type, const struct hw_addr_data *data) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| assert_return(data, -EINVAL); |
| assert_return(data->length > 0, -EINVAL); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_ETHER_ADDR); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, attr_type, data->bytes, data->length); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_cache_info(sd_netlink_message *m, uint16_t attr_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, attr_type, NETLINK_TYPE_CACHE_INFO); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, attr_type, info, sizeof(struct ifa_cacheinfo)); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_open_container(sd_netlink_message *m, uint16_t attr_type) { |
| size_t size; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| /* m->containers[m->n_containers + 1] is accessed both in read and write. Prevent access out of bound */ |
| assert_return(m->n_containers < (NETLINK_CONTAINER_DEPTH - 1), -ERANGE); |
| |
| r = message_attribute_has_type(m, &size, attr_type, NETLINK_TYPE_NESTED); |
| if (r < 0) { |
| const NLAPolicySetUnion *policy_set_union; |
| int family; |
| |
| r = message_attribute_has_type(m, &size, attr_type, NETLINK_TYPE_NESTED_UNION_BY_FAMILY); |
| if (r < 0) |
| return r; |
| |
| r = sd_rtnl_message_get_family(m, &family); |
| if (r < 0) |
| return r; |
| |
| policy_set_union = policy_set_get_policy_set_union( |
| m->containers[m->n_containers].policy_set, |
| attr_type); |
| if (!policy_set_union) |
| return -EOPNOTSUPP; |
| |
| m->containers[m->n_containers + 1].policy_set = |
| policy_set_union_get_policy_set_by_family( |
| policy_set_union, |
| family); |
| } else |
| m->containers[m->n_containers + 1].policy_set = |
| policy_set_get_policy_set( |
| m->containers[m->n_containers].policy_set, |
| attr_type); |
| if (!m->containers[m->n_containers + 1].policy_set) |
| return -EOPNOTSUPP; |
| |
| r = add_rtattr(m, attr_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, uint16_t attr_type, const char *key) { |
| const NLAPolicySetUnion *policy_set_union; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| assert_return(m->n_containers < (NETLINK_CONTAINER_DEPTH - 1), -ERANGE); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_NESTED_UNION_BY_STRING); |
| if (r < 0) |
| return r; |
| |
| policy_set_union = policy_set_get_policy_set_union( |
| m->containers[m->n_containers].policy_set, |
| attr_type); |
| if (!policy_set_union) |
| return -EOPNOTSUPP; |
| |
| m->containers[m->n_containers + 1].policy_set = |
| policy_set_union_get_policy_set_by_string( |
| policy_set_union, |
| key); |
| if (!m->containers[m->n_containers + 1].policy_set) |
| return -EOPNOTSUPP; |
| |
| r = sd_netlink_message_append_string(m, policy_set_union_get_match_attribute(policy_set_union), key); |
| if (r < 0) |
| return r; |
| |
| /* do we ever need non-null size */ |
| r = add_rtattr(m, attr_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].policy_set = 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 attr_type) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| assert_return(m->n_containers < (NETLINK_CONTAINER_DEPTH - 1), -ERANGE); |
| |
| r = add_rtattr(m, attr_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].policy_set = m->containers[m->n_containers - 1].policy_set; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_cancel_array(sd_netlink_message *m) { |
| 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 (unsigned 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].policy_set = NULL; |
| |
| return 0; |
| } |
| |
| static int netlink_message_read_internal( |
| sd_netlink_message *m, |
| uint16_t attr_type, |
| void **ret_data, |
| bool *ret_net_byteorder) { |
| |
| struct netlink_attribute *attribute; |
| struct rtattr *rta; |
| |
| assert_return(m, -EINVAL); |
| assert_return(m->sealed, -EPERM); |
| |
| assert(m->n_containers < NETLINK_CONTAINER_DEPTH); |
| |
| if (!m->containers[m->n_containers].attributes) |
| return -ENODATA; |
| |
| if (attr_type > m->containers[m->n_containers].max_attribute) |
| return -ENODATA; |
| |
| attribute = &m->containers[m->n_containers].attributes[attr_type]; |
| |
| if (attribute->offset == 0) |
| return -ENODATA; |
| |
| rta = (struct rtattr*)((uint8_t *) m->hdr + attribute->offset); |
| |
| if (ret_data) |
| *ret_data = RTA_DATA(rta); |
| |
| if (ret_net_byteorder) |
| *ret_net_byteorder = attribute->net_byteorder; |
| |
| return RTA_PAYLOAD(rta); |
| } |
| |
| int sd_netlink_message_read(sd_netlink_message *m, uint16_t attr_type, size_t size, void *data) { |
| void *attr_data; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| |
| r = netlink_message_read_internal(m, attr_type, &attr_data, NULL); |
| if (r < 0) |
| return r; |
| |
| if ((size_t) r > size) |
| return -ENOBUFS; |
| |
| if (data) |
| memcpy(data, attr_data, r); |
| |
| return r; |
| } |
| |
| int sd_netlink_message_read_data(sd_netlink_message *m, uint16_t attr_type, size_t *ret_size, void **ret_data) { |
| void *attr_data; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| |
| r = netlink_message_read_internal(m, attr_type, &attr_data, NULL); |
| if (r < 0) |
| return r; |
| |
| if (ret_data) { |
| void *data; |
| |
| data = memdup(attr_data, r); |
| if (!data) |
| return -ENOMEM; |
| |
| *ret_data = data; |
| } |
| |
| if (ret_size) |
| *ret_size = r; |
| |
| return r; |
| } |
| |
| int sd_netlink_message_read_data_suffix0(sd_netlink_message *m, uint16_t attr_type, size_t *ret_size, void **ret_data) { |
| void *attr_data; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| |
| r = netlink_message_read_internal(m, attr_type, &attr_data, NULL); |
| if (r < 0) |
| return r; |
| |
| if (ret_data) { |
| void *data; |
| |
| data = memdup_suffix0(attr_data, r); |
| if (!data) |
| return -ENOMEM; |
| |
| *ret_data = data; |
| } |
| |
| if (ret_size) |
| *ret_size = r; |
| |
| return r; |
| } |
| |
| int sd_netlink_message_read_string_strdup(sd_netlink_message *m, uint16_t attr_type, char **data) { |
| void *attr_data; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_STRING); |
| if (r < 0) |
| return r; |
| |
| r = netlink_message_read_internal(m, attr_type, &attr_data, NULL); |
| if (r < 0) |
| return r; |
| |
| if (data) { |
| char *str; |
| |
| str = strndup(attr_data, r); |
| if (!str) |
| return -ENOMEM; |
| |
| *data = str; |
| } |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_read_string(sd_netlink_message *m, uint16_t attr_type, const char **data) { |
| void *attr_data; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_STRING); |
| if (r < 0) |
| return r; |
| |
| r = netlink_message_read_internal(m, attr_type, &attr_data, NULL); |
| if (r < 0) |
| return r; |
| |
| 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, uint16_t attr_type, uint8_t *data) { |
| void *attr_data; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_U8); |
| if (r < 0) |
| return r; |
| |
| r = netlink_message_read_internal(m, attr_type, &attr_data, NULL); |
| if (r < 0) |
| return r; |
| |
| 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, uint16_t attr_type, uint16_t *data) { |
| void *attr_data; |
| bool net_byteorder; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_U16); |
| if (r < 0) |
| return r; |
| |
| r = netlink_message_read_internal(m, attr_type, &attr_data, &net_byteorder); |
| if (r < 0) |
| return r; |
| |
| 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, uint16_t attr_type, uint32_t *data) { |
| void *attr_data; |
| bool net_byteorder; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_U32); |
| if (r < 0) |
| return r; |
| |
| r = netlink_message_read_internal(m, attr_type, &attr_data, &net_byteorder); |
| if (r < 0) |
| return r; |
| |
| 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, uint16_t attr_type, struct ether_addr *data) { |
| void *attr_data; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_ETHER_ADDR); |
| if (r < 0) |
| return r; |
| |
| r = netlink_message_read_internal(m, attr_type, &attr_data, NULL); |
| if (r < 0) |
| return r; |
| |
| if ((size_t) r < sizeof(struct ether_addr)) |
| return -EIO; |
| |
| if (data) |
| memcpy(data, attr_data, sizeof(struct ether_addr)); |
| |
| return 0; |
| } |
| |
| int netlink_message_read_hw_addr(sd_netlink_message *m, uint16_t attr_type, struct hw_addr_data *data) { |
| void *attr_data; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_ETHER_ADDR); |
| if (r < 0) |
| return r; |
| |
| r = netlink_message_read_internal(m, attr_type, &attr_data, NULL); |
| if (r < 0) |
| return r; |
| |
| if (r > HW_ADDR_MAX_SIZE) |
| return -EIO; |
| |
| if (data) { |
| memcpy(data->bytes, attr_data, r); |
| data->length = r; |
| } |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_read_cache_info(sd_netlink_message *m, uint16_t attr_type, struct ifa_cacheinfo *info) { |
| void *attr_data; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_CACHE_INFO); |
| if (r < 0) |
| return r; |
| |
| r = netlink_message_read_internal(m, attr_type, &attr_data, NULL); |
| if (r < 0) |
| return r; |
| |
| 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, uint16_t attr_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, attr_type, NETLINK_TYPE_IN_ADDR); |
| if (r < 0) |
| return r; |
| |
| r = netlink_message_read_internal(m, attr_type, &attr_data, NULL); |
| if (r < 0) |
| return r; |
| |
| 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, uint16_t attr_type, struct in_addr *data) { |
| union in_addr_union u; |
| int r; |
| |
| r = netlink_message_read_in_addr_union(m, attr_type, AF_INET, &u); |
| if (r >= 0 && data) |
| *data = u.in; |
| |
| return r; |
| } |
| |
| int sd_netlink_message_read_in6_addr(sd_netlink_message *m, uint16_t attr_type, struct in6_addr *data) { |
| union in_addr_union u; |
| int r; |
| |
| r = netlink_message_read_in_addr_union(m, attr_type, AF_INET6, &u); |
| if (r >= 0 && data) |
| *data = u.in6; |
| |
| return r; |
| } |
| |
| int sd_netlink_message_has_flag(sd_netlink_message *m, uint16_t attr_type) { |
| void *attr_data; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| |
| /* This returns 1 when the flag is set, 0 when not set, negative errno on error. */ |
| |
| r = message_attribute_has_type(m, NULL, attr_type, NETLINK_TYPE_FLAG); |
| if (r < 0) |
| return r; |
| |
| r = netlink_message_read_internal(m, attr_type, &attr_data, NULL); |
| if (r == -ENODATA) |
| return 0; |
| if (r < 0) |
| return r; |
| |
| return 1; |
| } |
| |
| int sd_netlink_message_read_strv(sd_netlink_message *m, uint16_t container_type, uint16_t attr_type, char ***ret) { |
| _cleanup_strv_free_ char **s = NULL; |
| const NLAPolicySet *policy_set; |
| const NLAPolicy *policy; |
| struct rtattr *rta; |
| void *container; |
| size_t rt_len; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(m->n_containers < NETLINK_CONTAINER_DEPTH, -EINVAL); |
| |
| policy = policy_set_get_policy( |
| m->containers[m->n_containers].policy_set, |
| container_type); |
| if (!policy) |
| return -EOPNOTSUPP; |
| |
| if (policy_get_type(policy) != NETLINK_TYPE_NESTED) |
| return -EINVAL; |
| |
| policy_set = policy_set_get_policy_set( |
| m->containers[m->n_containers].policy_set, |
| container_type); |
| if (!policy_set) |
| return -EOPNOTSUPP; |
| |
| policy = policy_set_get_policy(policy_set, attr_type); |
| if (!policy) |
| return -EOPNOTSUPP; |
| |
| if (policy_get_type(policy) != 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)) { |
| uint16_t type; |
| |
| type = RTA_TYPE(rta); |
| if (type != attr_type) |
| 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; |
| uint16_t max_attr = 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)) { |
| uint16_t attr; |
| |
| attr = RTA_TYPE(rta); |
| max_attr = MAX(max_attr, attr); |
| |
| if (!GREEDY_REALLOC0(attributes, (size_t) max_attr + 1)) |
| return -ENOMEM; |
| |
| if (attributes[attr].offset != 0) |
| log_debug("sd-netlink: message parse - overwriting repeated attribute"); |
| |
| attributes[attr].offset = (uint8_t *) rta - (uint8_t *) m->hdr; |
| attributes[attr].nested = RTA_FLAGS(rta) & NLA_F_NESTED; |
| attributes[attr].net_byteorder = RTA_FLAGS(rta) & NLA_F_NET_BYTEORDER; |
| } |
| |
| container->attributes = TAKE_PTR(attributes); |
| container->max_attribute = max_attr; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_enter_container(sd_netlink_message *m, uint16_t attr_type) { |
| const NLAPolicy *policy; |
| const NLAPolicySet *policy_set; |
| void *container; |
| size_t size; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(m->n_containers < (NETLINK_CONTAINER_DEPTH - 1), -EINVAL); |
| |
| policy = policy_set_get_policy( |
| m->containers[m->n_containers].policy_set, |
| attr_type); |
| if (!policy) |
| return -EOPNOTSUPP; |
| |
| switch (policy_get_type(policy)) { |
| case NETLINK_TYPE_NESTED: |
| policy_set = policy_set_get_policy_set( |
| m->containers[m->n_containers].policy_set, |
| attr_type); |
| break; |
| |
| case NETLINK_TYPE_NESTED_UNION_BY_STRING: { |
| const NLAPolicySetUnion *policy_set_union; |
| const char *key; |
| |
| policy_set_union = policy_get_policy_set_union(policy); |
| if (!policy_set_union) |
| return -EOPNOTSUPP; |
| |
| r = sd_netlink_message_read_string( |
| m, |
| policy_set_union_get_match_attribute(policy_set_union), |
| &key); |
| if (r < 0) |
| return r; |
| |
| policy_set = policy_set_union_get_policy_set_by_string( |
| policy_set_union, |
| key); |
| break; |
| } |
| case NETLINK_TYPE_NESTED_UNION_BY_FAMILY: { |
| const NLAPolicySetUnion *policy_set_union; |
| int family; |
| |
| policy_set_union = policy_get_policy_set_union(policy); |
| if (!policy_set_union) |
| return -EOPNOTSUPP; |
| |
| r = sd_rtnl_message_get_family(m, &family); |
| if (r < 0) |
| return r; |
| |
| policy_set = policy_set_union_get_policy_set_by_family( |
| policy_set_union, |
| family); |
| break; |
| } |
| default: |
| assert_not_reached(); |
| } |
| if (!policy_set) |
| return -EOPNOTSUPP; |
| |
| r = netlink_message_read_internal(m, attr_type, &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].policy_set = policy_set; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_enter_array(sd_netlink_message *m, uint16_t attr_type) { |
| void *container; |
| size_t size; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(m->n_containers < (NETLINK_CONTAINER_DEPTH - 1), -EINVAL); |
| |
| r = netlink_message_read_internal(m, attr_type, &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].policy_set = m->containers[m->n_containers - 1].policy_set; |
| |
| 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].max_attribute = 0; |
| m->containers[m->n_containers].policy_set = NULL; |
| |
| m->n_containers--; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_get_max_attribute(sd_netlink_message *m, uint16_t *ret) { |
| assert_return(m, -EINVAL); |
| assert_return(m->sealed, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| *ret = m->containers[m->n_containers].max_attribute; |
| return 0; |
| } |
| |
| 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; |
| } |
| |
| 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 *nl) { |
| size_t size; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(nl, -EINVAL); |
| |
| /* don't allow appending to message once parsed */ |
| message_seal(m); |
| |
| for (unsigned 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 = netlink_get_policy_set_and_header_size(nl, m->hdr->nlmsg_type, |
| &m->containers[0].policy_set, &size); |
| if (r < 0) |
| return r; |
| |
| if (sd_netlink_message_is_error(m)) |
| return netlink_message_parse_error(m); |
| |
| return netlink_container_parse(m, |
| &m->containers[0], |
| (struct rtattr*)((uint8_t*) NLMSG_DATA(m->hdr) + NLMSG_ALIGN(size)), |
| NLMSG_PAYLOAD(m->hdr, size)); |
| } |
| |
| void message_seal(sd_netlink_message *m) { |
| assert(m); |
| |
| m->sealed = true; |
| } |
| |
| sd_netlink_message *sd_netlink_message_next(sd_netlink_message *m) { |
| assert_return(m, NULL); |
| |
| return m->next; |
| } |
