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https://passt.top/passt
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d0dd0242a6
In pasta mode, when we receive a new inbound connection, we need to
select a socket that was created in the namespace to proceed and
connect() it to its final destination.
The existing condition might pick a wrong socket, though, if the
destination port is remapped, because we'll check the bitmap of
inbound ports using the remapped port (stored in the epoll reference)
as index, and not the original port.
Instead of using the port bitmap for this purpose, store this
information in the epoll reference itself, by adding a new 'outbound'
bit, that's set if the listening socket was created the namespace,
and unset otherwise.
Then, use this bit to pick a socket on the right side.
Suggested-by: David Gibson <david@gibson.dropbear.id.au>
Fixes: 33482d5bf2 ("passt: Add PASTA mode, major rework")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
/* SPDX-License-Identifier: AGPL-3.0-or-later
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* Copyright (c) 2021 Red Hat GmbH
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* Author: Stefano Brivio <sbrivio@redhat.com>
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*/
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#ifndef TCP_H
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#define TCP_H
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#define TCP_TIMER_INTERVAL 1000 /* ms */
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#define TCP_CONN_INDEX_BITS 17 /* 128k */
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#define TCP_MAX_CONNS (1 << TCP_CONN_INDEX_BITS)
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#define TCP_MAX_SOCKS (TCP_MAX_CONNS + USHRT_MAX * 2)
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#define TCP_SOCK_POOL_SIZE 32
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struct ctx;
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void tcp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events,
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const struct timespec *now);
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int tcp_tap_handler(struct ctx *c, int af, const void *addr,
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const struct pool *p, const struct timespec *now);
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void tcp_sock_init(const struct ctx *c, int ns, sa_family_t af,
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const void *addr, const char *ifname, in_port_t port);
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int tcp_init(struct ctx *c);
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void tcp_timer(struct ctx *c, const struct timespec *ts);
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void tcp_defer_handler(struct ctx *c);
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void tcp_sock_set_bufsize(const struct ctx *c, int s);
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void tcp_update_l2_buf(const unsigned char *eth_d, const unsigned char *eth_s,
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const uint32_t *ip_da);
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/**
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* union tcp_epoll_ref - epoll reference portion for TCP connections
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* @listen: Set if this file descriptor is a listening socket
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* @splice: Set if descriptor is associated to a spliced connection
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* @outbound: Listening socket maps to outbound, spliced connection
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* @v6: Set for IPv6 sockets or connections
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* @timer: Reference is a timerfd descriptor for connection
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* @index: Index of connection in table, or port for bound sockets
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* @u32: Opaque u32 value of reference
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*/
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union tcp_epoll_ref {
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struct {
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uint32_t listen:1,
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splice:1,
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outbound:1,
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v6:1,
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timer:1,
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index:20;
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} tcp;
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uint32_t u32;
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};
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/**
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* struct tcp_ctx - Execution context for TCP routines
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* @hash_secret: 128-bit secret for hash functions, ISN and hash table
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* @conn_count: Count of connections (not spliced) in connection table
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* @splice_conn_count: Count of spliced connections in connection table
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* @port_to_tap: Ports bound host-side, packets to tap or spliced
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* @fwd_in: Port forwarding configuration for inbound packets
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* @fwd_out: Port forwarding configuration for outbound packets
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* @timer_run: Timestamp of most recent timer run
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* @kernel_snd_wnd: Kernel reports sending window (with commit 8f7baad7f035)
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* @pipe_size: Size of pipes for spliced connections
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*/
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struct tcp_ctx {
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uint64_t hash_secret[2];
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int conn_count;
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int splice_conn_count;
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struct port_fwd fwd_in;
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struct port_fwd fwd_out;
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struct timespec timer_run;
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#ifdef HAS_SND_WND
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int kernel_snd_wnd;
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#endif
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size_t pipe_size;
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};
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#endif /* TCP_H */
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