diff options
Diffstat (limited to 'src/libsystemd/sd-netlink/netlink-internal.h')
| -rw-r--r-- | src/libsystemd/sd-netlink/netlink-internal.h | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/src/libsystemd/sd-netlink/netlink-internal.h b/src/libsystemd/sd-netlink/netlink-internal.h new file mode 100644 index 0000000..514f225 --- /dev/null +++ b/src/libsystemd/sd-netlink/netlink-internal.h @@ -0,0 +1,213 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +#pragma once + +#include <linux/netlink.h> + +#include "sd-netlink.h" + +#include "list.h" +#include "netlink-types.h" +#include "prioq.h" +#include "time-util.h" + +#define NETLINK_DEFAULT_TIMEOUT_USEC ((usec_t) (25 * USEC_PER_SEC)) + +#define NETLINK_RQUEUE_MAX 64*1024 + +#define NETLINK_CONTAINER_DEPTH 32 + +struct reply_callback { + sd_netlink_message_handler_t callback; + usec_t timeout; + uint32_t serial; + unsigned prioq_idx; +}; + +struct match_callback { + sd_netlink_message_handler_t callback; + uint32_t *groups; + size_t n_groups; + uint16_t type; + uint8_t cmd; /* used by genl */ + + LIST_FIELDS(struct match_callback, match_callbacks); +}; + +typedef enum NetlinkSlotType { + NETLINK_REPLY_CALLBACK, + NETLINK_MATCH_CALLBACK, + _NETLINK_SLOT_INVALID = -EINVAL, +} NetlinkSlotType; + +struct sd_netlink_slot { + unsigned n_ref; + NetlinkSlotType type:8; + bool floating; + sd_netlink *netlink; + void *userdata; + sd_netlink_destroy_t destroy_callback; + + char *description; + + LIST_FIELDS(sd_netlink_slot, slots); + + union { + struct reply_callback reply_callback; + struct match_callback match_callback; + }; +}; + +struct sd_netlink { + unsigned n_ref; + + int fd; + + union { + struct sockaddr sa; + struct sockaddr_nl nl; + } sockaddr; + + int protocol; + + Hashmap *broadcast_group_refs; + bool broadcast_group_dont_leave:1; /* until we can rely on 4.2 */ + + sd_netlink_message **rqueue; + unsigned rqueue_size; + + sd_netlink_message **rqueue_partial; + unsigned rqueue_partial_size; + + struct nlmsghdr *rbuffer; + + bool processing:1; + + uint32_t serial; + + struct Prioq *reply_callbacks_prioq; + Hashmap *reply_callbacks; + + LIST_HEAD(struct match_callback, match_callbacks); + + LIST_HEAD(sd_netlink_slot, slots); + + pid_t original_pid; + + sd_event_source *io_event_source; + sd_event_source *time_event_source; + sd_event_source *exit_event_source; + sd_event *event; + + Hashmap *genl_family_by_name; + Hashmap *genl_family_by_id; +}; + +struct netlink_attribute { + size_t offset; /* offset from hdr to attribute */ + bool nested:1; + bool net_byteorder:1; +}; + +struct netlink_container { + const struct NLAPolicySet *policy_set; /* the policy set of the container */ + size_t offset; /* offset from hdr to the start of the container */ + struct netlink_attribute *attributes; + uint16_t max_attribute; /* the maximum attribute in container */ +}; + +struct sd_netlink_message { + unsigned n_ref; + + int protocol; + + struct nlmsghdr *hdr; + struct netlink_container containers[NETLINK_CONTAINER_DEPTH]; + unsigned n_containers; /* number of containers */ + uint32_t multicast_group; + bool sealed:1; + + sd_netlink_message *next; /* next in a chain of multi-part messages */ +}; + +int message_new_empty(sd_netlink *nl, sd_netlink_message **ret); +int message_new_full( + sd_netlink *nl, + uint16_t nlmsg_type, + const NLAPolicySet *policy_set, + size_t header_size, + sd_netlink_message **ret); +int message_new(sd_netlink *nl, sd_netlink_message **ret, uint16_t type); +int message_new_synthetic_error(sd_netlink *nl, int error, uint32_t serial, sd_netlink_message **ret); + +static inline uint32_t message_get_serial(sd_netlink_message *m) { + assert(m); + return ASSERT_PTR(m->hdr)->nlmsg_seq; +} + +void message_seal(sd_netlink_message *m); + +int netlink_open_family(sd_netlink **ret, int family); +bool netlink_pid_changed(sd_netlink *nl); +int netlink_rqueue_make_room(sd_netlink *nl); +int netlink_rqueue_partial_make_room(sd_netlink *nl); + +int socket_bind(sd_netlink *nl); +int socket_broadcast_group_ref(sd_netlink *nl, unsigned group); +int socket_broadcast_group_unref(sd_netlink *nl, unsigned group); +int socket_write_message(sd_netlink *nl, sd_netlink_message *m); +int socket_read_message(sd_netlink *nl); + +int netlink_add_match_internal( + sd_netlink *nl, + sd_netlink_slot **ret_slot, + const uint32_t *groups, + size_t n_groups, + uint16_t type, + uint8_t cmd, + sd_netlink_message_handler_t callback, + sd_netlink_destroy_t destroy_callback, + void *userdata, + const char *description); + +/* Make sure callbacks don't destroy the netlink connection */ +#define NETLINK_DONT_DESTROY(nl) \ + _cleanup_(sd_netlink_unrefp) _unused_ sd_netlink *_dont_destroy_##nl = sd_netlink_ref(nl) + +/* nfnl */ +/* TODO: to be exported later */ +int sd_nfnl_socket_open(sd_netlink **ret); +int sd_nfnl_send_batch( + sd_netlink *nfnl, + sd_netlink_message **messages, + size_t msgcount, + uint32_t **ret_serials); +int sd_nfnl_call_batch( + sd_netlink *nfnl, + sd_netlink_message **messages, + size_t n_messages, + uint64_t usec, + sd_netlink_message ***ret_messages); +int sd_nfnl_message_new( + sd_netlink *nfnl, + sd_netlink_message **ret, + int nfproto, + uint16_t subsys, + uint16_t msg_type, + uint16_t flags); +int sd_nfnl_nft_message_new_table(sd_netlink *nfnl, sd_netlink_message **ret, + int nfproto, const char *table); +int sd_nfnl_nft_message_new_basechain(sd_netlink *nfnl, sd_netlink_message **ret, + int nfproto, const char *table, const char *chain, + const char *type, uint8_t hook, int prio); +int sd_nfnl_nft_message_new_rule(sd_netlink *nfnl, sd_netlink_message **ret, + int nfproto, const char *table, const char *chain); +int sd_nfnl_nft_message_new_set(sd_netlink *nfnl, sd_netlink_message **ret, + int nfproto, const char *table, const char *set_name, + uint32_t setid, uint32_t klen); +int sd_nfnl_nft_message_new_setelems(sd_netlink *nfnl, sd_netlink_message **ret, + int add, int nfproto, const char *table, const char *set_name); +int sd_nfnl_nft_message_append_setelem(sd_netlink_message *m, + uint32_t index, + const void *key, size_t key_len, + const void *data, size_t data_len, + uint32_t flags); |