mirror of
https://passt.top/passt
synced 2024-06-30 15:02:40 +00:00
034fa8a58d
This bit in the TCP specific epoll reference indicates whether the connection is IPv6 or IPv4. However the sites which refer to it are already calling accept() which (optionally) returns an address for the remote end of the connection. We can use the sa_family field in that address to determine the connection type independent of the epoll reference. This does have a cost: for the spliced case, it means we now need to get that address from accept() which introduces an extran copy_to_user(). However, in future we want to allow handling IPv4 connectons through IPv6 sockets, which means we won't be able to determine the IP version at the time we create the listening socket and epoll reference. So, at some point we'll have to pay this cost anyway. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/* SPDX-License-Identifier: AGPL-3.0-or-later
|
|
* Copyright (c) 2021 Red Hat GmbH
|
|
* Author: Stefano Brivio <sbrivio@redhat.com>
|
|
*/
|
|
|
|
#ifndef TCP_H
|
|
#define TCP_H
|
|
|
|
#define TCP_TIMER_INTERVAL 1000 /* ms */
|
|
|
|
#define TCP_CONN_INDEX_BITS 17 /* 128k */
|
|
#define TCP_MAX_CONNS (1 << TCP_CONN_INDEX_BITS)
|
|
|
|
#define TCP_SOCK_POOL_SIZE 32
|
|
|
|
struct ctx;
|
|
|
|
void tcp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events,
|
|
const struct timespec *now);
|
|
int tcp_tap_handler(struct ctx *c, int af, const void *addr,
|
|
const struct pool *p, const struct timespec *now);
|
|
void tcp_sock_init(const struct ctx *c, sa_family_t af, const void *addr,
|
|
const char *ifname, in_port_t port);
|
|
int tcp_init(struct ctx *c);
|
|
void tcp_timer(struct ctx *c, const struct timespec *ts);
|
|
void tcp_defer_handler(struct ctx *c);
|
|
|
|
void tcp_sock_set_bufsize(const struct ctx *c, int s);
|
|
void tcp_update_l2_buf(const unsigned char *eth_d, const unsigned char *eth_s,
|
|
const struct in_addr *ip_da);
|
|
|
|
/**
|
|
* union tcp_epoll_ref - epoll reference portion for TCP connections
|
|
* @listen: Set if this file descriptor is a listening socket
|
|
* @outbound: Listening socket maps to outbound, spliced connection
|
|
* @timer: Reference is a timerfd descriptor for connection
|
|
* @index: Index of connection in table, or port for bound sockets
|
|
* @u32: Opaque u32 value of reference
|
|
*/
|
|
union tcp_epoll_ref {
|
|
struct {
|
|
uint32_t listen:1,
|
|
outbound:1,
|
|
timer:1,
|
|
index:20;
|
|
} tcp;
|
|
uint32_t u32;
|
|
};
|
|
|
|
/**
|
|
* struct tcp_ctx - Execution context for TCP routines
|
|
* @hash_secret: 128-bit secret for hash functions, ISN and hash table
|
|
* @conn_count: Count of total 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
|
|
* @fwd_in: Port forwarding configuration for inbound packets
|
|
* @fwd_out: Port forwarding configuration for outbound packets
|
|
* @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
|
|
*/
|
|
struct tcp_ctx {
|
|
uint64_t hash_secret[2];
|
|
int conn_count;
|
|
int splice_conn_count;
|
|
struct port_fwd fwd_in;
|
|
struct port_fwd fwd_out;
|
|
struct timespec timer_run;
|
|
#ifdef HAS_SND_WND
|
|
int kernel_snd_wnd;
|
|
#endif
|
|
size_t pipe_size;
|
|
};
|
|
|
|
#endif /* TCP_H */
|