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bb70811183
Implement a packet abstraction providing boundary and size checks
based on packet descriptors: packets stored in a buffer can be queued
into a pool (without storage of its own), and data can be retrieved
referring to an index in the pool, specifying offset and length.
Checks ensure data is not read outside the boundaries of buffer and
descriptors, and that packets added to a pool are within the buffer
range with valid offset and indices.
This implies a wider rework: usage of the "queueing" part of the
abstraction mostly affects tap_handler_{passt,pasta}() functions and
their callees, while the "fetching" part affects all the guest or tap
facing implementations: TCP, UDP, ICMP, ARP, NDP, DHCP and DHCPv6
handlers.
Suggested-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
62 lines
1.8 KiB
C
62 lines
1.8 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 UDP_H
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#define UDP_H
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#define UDP_TIMER_INTERVAL 1000 /* ms */
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void udp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events,
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struct timespec *now);
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int udp_tap_handler(struct ctx *c, int af, void *addr, struct pool *p,
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struct timespec *now);
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int udp_sock_init(struct ctx *c);
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void udp_timer(struct ctx *c, struct timespec *ts);
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void udp_update_l2_buf(unsigned char *eth_d, unsigned char *eth_s,
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const uint32_t *ip_da);
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void udp_remap_to_tap(in_port_t port, in_port_t delta);
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void udp_remap_to_init(in_port_t port, in_port_t delta);
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/**
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* union udp_epoll_ref - epoll reference portion for TCP connections
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* @bound: Set if this file descriptor is a bound socket
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* @splice: Set if descriptor is associated to "spliced" connection
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* @v6: Set for IPv6 sockets or connections
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* @port: Source port for connected sockets, bound port otherwise
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* @u32: Opaque u32 value of reference
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*/
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union udp_epoll_ref {
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struct {
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uint32_t bound:1,
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splice:3,
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#define UDP_TO_NS 1
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#define UDP_TO_INIT 2
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#define UDP_BACK_TO_NS 3
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#define UDP_BACK_TO_INIT 4
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v6:1,
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port:16;
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} udp;
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uint32_t u32;
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};
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/**
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* struct udp_ctx - Execution context for UDP
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* @port_to_tap: Ports bound host-side, data to tap or ns L4 socket
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* @init_detect_ports: If set, periodically detect ports bound in init (TODO)
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* @port_to_init: Ports bound namespace-side, data to init L4 socket
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* @ns_detect_ports: If set, periodically detect ports bound in namespace
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* @timer_run: Timestamp of most recent timer run
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*/
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struct udp_ctx {
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uint8_t port_to_tap [USHRT_MAX / 8];
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int init_detect_ports;
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uint8_t port_to_init [USHRT_MAX / 8];
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int ns_detect_ports;
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struct timespec timer_run;
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};
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#endif /* UDP_H */
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