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conf, tcp: Periodic detection of bound ports for pasta port forwarding

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Detecting bound ports at start-up time isn't terribly useful: do this
periodically instead, if configured.

This is only implemented for TCP at the moment, UDP is somewhat more
complicated: leave a TODO there.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio
2021-09-27 05:24:30 +02:00
parent e69e13671d
commit 9657b6ed05
8 changed files with 316 additions and 97 deletions
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6
tcp.h
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@@ -43,22 +43,28 @@ union tcp_epoll_ref {
* @tap_conn_count: Count of tap connections in connection table
* @splice_conn_count: Count of spliced connections in connection table
* @port_to_tap: Ports bound host-side, packets to tap or spliced
* @init_detect_ports: If set, periodically detect ports bound in init
* @port_to_init: Ports bound namespace-side, spliced to init
* @ns_detect_ports: If set, periodically detect ports bound in namespace
* @timer_run: Timestamp of most recent timer run
* @kernel_snd_wnd: Kernel reports sending window (with commit 8f7baad7f035)
* @pipe_size: Size of pipes for spliced connections
* @refill_ts: Time of last refill operation for pools of sockets/pipes
* @port_detect_ts: Time of last TCP port detection/rebind, if enabled
*/
struct tcp_ctx {
uint64_t hash_secret[2];
int tap_conn_count;
int splice_conn_count;
uint8_t port_to_tap [USHRT_MAX / 8];
int init_detect_ports;
uint8_t port_to_init [USHRT_MAX / 8];
int ns_detect_ports;
struct timespec timer_run;
int kernel_snd_wnd;
size_t pipe_size;
struct timespec refill_ts;
struct timespec port_detect_ts;
};
#endif /* TCP_H */