mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-12-22 17:51:53 +00:00
e6a100b31a
This commit is quite a substantial rework of the underlying layers in BMP TX: - several unnecessary layers of indirection dropped, including most of the original BMP's buffer machinery - all messages are now written directly into one protocol's buffer allocated for the whole time big enough to fit every possible message - output blocks are allocated by pages and immediately returned when used, improving the overall memory footprint - no intermediary allocation is done from the heap altogether - there is a documented and configurable limit on the TX queue size
142 lines
4.8 KiB
C
142 lines
4.8 KiB
C
/*
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* BIRD -- The BGP Monitoring Protocol (BMP)
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*
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* (c) 2020 Akamai Technologies, Inc. (Pawel Maslanka, pmaslank@akamai.com)
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_BMP_H_
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#define _BIRD_BMP_H_
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#include "nest/bird.h"
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#include "nest/protocol.h"
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#include "lib/lists.h"
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#include "nest/route.h"
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#include "lib/event.h"
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#include "lib/hash.h"
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#include "lib/socket.h"
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#include "proto/bgp/bgp.h"
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#include "proto/bmp/map.h"
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// Max length of MIB-II description object
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#define MIB_II_STR_LEN 255
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// Total size of Common Header
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#define BMP_COMMON_HDR_SIZE 6
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/* BMP Per-Peer Header [RFC 7854 - Section 4.2] */
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// Total size of Per-Peer Header
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#define BMP_PER_PEER_HDR_SIZE 42
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// Maximum length of BMP message altogether
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#define BMP_MSGBUF_LEN (BGP_MAX_EXT_MSG_LENGTH + BMP_PER_PEER_HDR_SIZE + BMP_COMMON_HDR_SIZE + 1)
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// The following fields of this structure controls whether there will be put
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// specific routes into Route Monitoring message and send to BMP collector
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struct monitoring_rib {
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bool in_pre_policy; // Monitoring pre-policy Adj-Rib-In
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bool in_post_policy; // Monitoring post-policy Adj-Rib-In
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bool local; // Monitoring Local Rib
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};
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struct bmp_config {
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struct proto_config c;
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const char *sys_descr; // sysDescr MIB-II [RFC1213] object
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const char *sys_name; // sysName MIB-II [RFC1213] object
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ip_addr local_addr; // Local IP address
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ip_addr station_ip; // Monitoring station address
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u16 station_port; // Monitoring station TCP port
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bool monitoring_rib_in_pre_policy; // Route monitoring pre-policy Adj-Rib-In
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bool monitoring_rib_in_post_policy; // Route monitoring post-policy Adj-Rib-In
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uint tx_pending_limit; // Maximum on pending TX buffer count
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};
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/* Forward declarations */
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struct bgp_proto;
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struct bmp_proto;
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struct bmp_proto {
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struct proto p; // Parent proto
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const struct bmp_config *cf; // Shortcut to BMP configuration
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node bmp_node; // Node in bmp_proto_list
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HASH(struct bmp_peer) peer_map;
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HASH(struct bmp_stream) stream_map;
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HASH(struct bmp_table) table_map;
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sock *sk; // TCP connection
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event *tx_ev; // TX event
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event *update_ev; // Update event
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char sys_descr[MIB_II_STR_LEN]; // sysDescr MIB-II [RFC1213] object
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char sys_name[MIB_II_STR_LEN]; // sysName MIB-II [RFC1213] object
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ip_addr local_addr; // Source local IP address
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ip_addr station_ip; // Monitoring station IP address
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u16 station_port; // Monitoring station TCP port
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struct monitoring_rib monitoring_rib;
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// Below fields are for internal use
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// struct bmp_peer_map bgp_peers; // Stores 'bgp_proto' structure per BGP peer
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struct bmp_tx_buffer *tx_pending;// This buffer waits for socket to flush
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struct bmp_tx_buffer *tx_last; // This buffer is the last to flush
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uint tx_pending_count; // How many buffers waiting for flush
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uint tx_pending_limit; // Maximum on buffer count
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u64 tx_sent; // Amount of data sent
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u64 tx_sent_total; // Amount of data sent accumulated over reconnections
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event *tx_overflow_event; // Too many buffers waiting for flush
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timer *connect_retry_timer; // Timer for retrying connection to the BMP collector
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bool started; // Flag that stores running status of BMP instance
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int sock_err; // Last socket error code
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byte msgbuf[BMP_MSGBUF_LEN]; // Buffer for preparing the messages before sending them out
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};
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struct bmp_peer {
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struct bgp_proto *bgp;
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struct bmp_peer *next;
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list streams;
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};
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struct bmp_stream {
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node n;
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struct bgp_proto *bgp;
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u32 key;
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bool sync;
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struct bmp_stream *next;
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struct bmp_table *table;
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struct bgp_channel *sender;
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};
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struct bmp_table {
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struct rtable *table;
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struct bmp_table *next;
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struct channel *channel;
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u32 uc;
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};
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#ifdef CONFIG_BMP
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/**
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* bmp_peer_up - send notification that BGP peer connection is established
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*/
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void
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bmp_peer_up(struct bgp_proto *bgp,
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const byte *tx_open_msg, uint tx_open_length,
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const byte *rx_open_msg, uint rx_open_length);
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/**
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* bmp_peer_down - send notification that BGP peer connection is not in
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* established state
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*/
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void
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bmp_peer_down(const struct bgp_proto *bgp, int err_class, int code, int subcode, const byte *data, int length);
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#else /* BMP build disabled */
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static inline void bmp_peer_up(struct bgp_proto *bgp UNUSED, const byte *tx_open_msg UNUSED, uint tx_open_length UNUSED, const byte *rx_open_msg UNUSED, uint rx_open_length UNUSED) { }
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static inline void bmp_peer_down(const struct bgp_proto *bgp UNUSED, const int err_class UNUSED, int code UNUSED, int subcode UNUSED, const byte *data UNUSED, int length UNUSED) { }
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#endif /* CONFIG_BMP */
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#endif /* _BIRD_BMP_H_ */
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