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passt/tcp_splice.h

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passt: Relicense to GPL 2.0, or any later version In practical terms, passt doesn't benefit from the additional protection offered by the AGPL over the GPL, because it's not suitable to be executed over a computer network. Further, restricting the distribution under the version 3 of the GPL wouldn't provide any practical advantage either, as long as the passt codebase is concerned, and might cause unnecessary compatibility dilemmas. Change licensing terms to the GNU General Public License Version 2, or any later version, with written permission from all current and past contributors, namely: myself, David Gibson, Laine Stump, Andrea Bolognani, Paul Holzinger, Richard W.M. Jones, Chris Kuhn, Florian Weimer, Giuseppe Scrivano, Stefan Hajnoczi, and Vasiliy Ulyanov. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2023-04-05 18:11:44 +00:00
/* SPDX-License-Identifier: GPL-2.0-or-later
tcp: Refactor to use events instead of states, split out spliced implementation Using events and flags instead of states makes the implementation much more straightforward: actions are mostly centered on events that occurred on the connection rather than states. An example is given by the ESTABLISHED_SOCK_FIN_SENT and FIN_WAIT_1_SOCK_FIN abominations: we don't actually care about which side started closing the connection to handle closing of connection halves. Split out the spliced implementation, as it has very little in common with the "regular" TCP path. Refactor things here and there to improve clarity. Add helpers to trace where resets and flag settings come from. No functional changes intended. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2022-03-15 00:07:02 +00:00
* Copyright (c) 2022 Red Hat GmbH
* Author: Stefano Brivio <sbrivio@redhat.com>
*/
treewide: Add include guards ...at the moment, just for consistency with packet.h, icmp.h, tcp.h and udp.h. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2022-03-25 23:05:31 +00:00
#ifndef TCP_SPLICE_H
#define TCP_SPLICE_H
tcp: Unify part of spliced and non-spliced conn_from_sock path In tcp_sock_handler() we split off to handle spliced sockets before checking anything else. However the first steps of the "new connection" path for each case are the same: allocate a connection entry and accept() the connection. Remove this duplication by making tcp_conn_from_sock() handle both spliced and non-spliced cases, with help from more specific tcp_tap_conn_from_sock and tcp_splice_conn_from_sock functions for the later stages which differ. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2022-11-17 05:58:51 +00:00
struct tcp_splice_conn;
inany: Introduce union sockaddr_inany There are a number of places where we want to handle either a sockaddr_in or a sockaddr_in6. In some of those we use a void *, which works ok and matches some standard library interfaces, but doesn't give a signature level hint that we're dealing with only sockaddr_in or sockaddr_in6, not (say) sockaddr_un or another type of socket address. Other places we use a sockaddr_storage, which also works, but has the same problem in addition to allocating more on the stack than we need to. Introduce union sockaddr_inany to explictly handle this case: it has variants for sockaddr_in and sockaddr_in6. Use it in a number of places where it's easy to do so. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2024-02-28 11:25:04 +00:00
union sockaddr_inany;
tcp: Unify part of spliced and non-spliced conn_from_sock path In tcp_sock_handler() we split off to handle spliced sockets before checking anything else. However the first steps of the "new connection" path for each case are the same: allocate a connection entry and accept() the connection. Remove this duplication by making tcp_conn_from_sock() handle both spliced and non-spliced cases, with help from more specific tcp_tap_conn_from_sock and tcp_splice_conn_from_sock functions for the later stages which differ. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2022-11-17 05:58:51 +00:00
tcp, tcp_splice: Avoid double layered dispatch for connected TCP sockets Currently connected TCP sockets have the same epoll type, whether they're for a "tap" connection or a spliced connection. This means that tcp_sock_handler() has to do a secondary check on the type of the connection to call the right function. We can avoid this by adding a new epoll type and dispatching directly to the right thing. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2024-01-16 00:50:38 +00:00
void tcp_splice_sock_handler(struct ctx *c, union epoll_ref ref,
uint32_t events);
flow, tcp: Flow based NAT and port forwarding for TCP Currently the code to translate host side addresses and ports to guest side addresses and ports, and vice versa, is scattered across the TCP code. This includes both port redirection as controlled by the -t and -T options, and our special case NAT controlled by the --no-map-gw option. Gather this logic into fwd_nat_from_*() functions for each input interface in fwd.c which take protocol and address information for the initiating side and generates the pif and address information for the forwarded side. This performs any NAT or port forwarding needed. We create a flow_target() helper which applies those forwarding functions as needed to automatically move a flow from INI to TGT state. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2024-07-18 05:26:43 +00:00
void tcp_splice_conn_from_sock(const struct ctx *c, union flow *flow, int s0);
tcp: Refactor to use events instead of states, split out spliced implementation Using events and flags instead of states makes the implementation much more straightforward: actions are mostly centered on events that occurred on the connection rather than states. An example is given by the ESTABLISHED_SOCK_FIN_SENT and FIN_WAIT_1_SOCK_FIN abominations: we don't actually care about which side started closing the connection to handle closing of connection halves. Split out the spliced implementation, as it has very little in common with the "regular" TCP path. Refactor things here and there to improve clarity. Add helpers to trace where resets and flag settings come from. No functional changes intended. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2022-03-15 00:07:02 +00:00
void tcp_splice_init(struct ctx *c);
treewide: Add include guards ...at the moment, just for consistency with packet.h, icmp.h, tcp.h and udp.h. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2022-03-25 23:05:31 +00:00
#endif /* TCP_SPLICE_H */
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