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passt/passt.h
Stefano Brivio 70148ce5be conf, passt.h: Rename "outbound" interface to "template" interface 
In preparation for the next patch, make it clear that the first
routable interface fetched via netlink, or the one configured via
-i/--interface, is simply used as template to copy addresses and
routes, not an interface we actually use to derive the source address
(which will be _bound to_) for outgoing packets.

The man page and usage message appear to be already clear enough.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2023-03-09 00:36:08 +01:00

259 lines
7.2 KiB
C
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/* SPDX-License-Identifier: AGPL-3.0-or-later
* Copyright (c) 2021 Red Hat GmbH
* Author: Stefano Brivio <sbrivio@redhat.com>
*/
#ifndef PASST_H
#define PASST_H
#define UNIX_SOCK_MAX 100
#define UNIX_SOCK_PATH "/tmp/passt_%i.socket"
/**
* struct tap_msg - Generic message descriptor for arrays of messages
* @pkt_buf_offset: Offset from @pkt_buf
* @len: Message length, with L2 headers
*/
struct tap_msg {
uint32_t pkt_buf_offset;
uint16_t len;
};
/**
* struct tap_l4_msg - Layer-4 message descriptor for protocol handlers
* @pkt_buf_offset: Offset of message from @pkt_buf
* @l4_len: Length of Layer-4 payload, host order
*/
struct tap_l4_msg {
uint32_t pkt_buf_offset;
uint16_t l4_len;
};
union epoll_ref;
#include <stdbool.h>
#include "packet.h"
#include "icmp.h"
#include "port_fwd.h"
#include "tcp.h"
#include "udp.h"
/**
* union epoll_ref - Breakdown of reference for epoll socket bookkeeping
* @proto: IP protocol number
* @s: Socket number (implies 2^24-1 limit on number of descriptors)
* @tcp: TCP-specific reference part
* @udp: UDP-specific reference part
* @icmp: ICMP-specific reference part
* @data: Data handled by protocol handlers
* @u64: Opaque reference for epoll_ctl() and epoll_wait()
*/
union epoll_ref {
struct {
int32_t proto:8,
#define SOCKET_REF_BITS 24
#define SOCKET_MAX MAX_FROM_BITS(SOCKET_REF_BITS)
s:SOCKET_REF_BITS;
union {
union tcp_epoll_ref tcp;
union udp_epoll_ref udp;
union icmp_epoll_ref icmp;
uint32_t data;
} p;
} r;
uint64_t u64;
};
#define TAP_BUF_BYTES \
ROUND_DOWN(((ETH_MAX_MTU + sizeof(uint32_t)) * 128), PAGE_SIZE)
#define TAP_BUF_FILL (TAP_BUF_BYTES - ETH_MAX_MTU - sizeof(uint32_t))
#define TAP_MSGS \
DIV_ROUND_UP(TAP_BUF_BYTES, ETH_ZLEN - 2 * ETH_ALEN + sizeof(uint32_t))
#define PKT_BUF_BYTES MAX(TAP_BUF_BYTES, 0)
extern char pkt_buf [PKT_BUF_BYTES];
extern char *ip_proto_str[];
#define IP_PROTO_STR(n) \
(((uint8_t)(n) <= IPPROTO_SCTP && ip_proto_str[(n)]) ? \
ip_proto_str[(n)] : "?")
#include <resolv.h> /* For MAXNS below */
/**
* struct fqdn - Representation of fully-qualified domain name
* @n: Domain name string
*/
struct fqdn {
char n[NS_MAXDNAME];
};
#include <net/if.h>
#include <linux/un.h>
enum passt_modes {
MODE_PASST,
MODE_PASTA,
};
/**
* struct ip4_ctx - IPv4 execution context
* @addr: IPv4 address for external, routable interface
* @addr_seen: Latest IPv4 address seen as source from tap
* @prefixlen: IPv4 prefix length (netmask)
* @gw: Default IPv4 gateway, network order
* @dns: DNS addresses for DHCP, zero-terminated, network order
* @dns_match: Forward DNS query if sent to this address, network order
* @dns_host: Use this DNS on the host for forwarding, network order
*/
struct ip4_ctx {
struct in_addr addr;
struct in_addr addr_seen;
int prefix_len;
struct in_addr gw;
struct in_addr dns[MAXNS + 1];
struct in_addr dns_match;
struct in_addr dns_host;
};
/**
* struct ip6_ctx - IPv6 execution context
* @addr: IPv6 address for external, routable interface
* @addr_ll: Link-local IPv6 address on external, routable interface
* @addr_seen: Latest IPv6 global/site address seen as source from tap
* @addr_ll_seen: Latest IPv6 link-local address seen as source from tap
* @gw: Default IPv6 gateway
* @dns: DNS addresses for DHCPv6 and NDP, zero-terminated
* @dns_match: Forward DNS query if sent to this address
* @dns_host: Use this DNS on the host for forwarding
*/
struct ip6_ctx {
struct in6_addr addr;
struct in6_addr addr_ll;
struct in6_addr addr_seen;
struct in6_addr addr_ll_seen;
struct in6_addr gw;
struct in6_addr dns[MAXNS + 1];
struct in6_addr dns_match;
struct in6_addr dns_host;
};
#include <netinet/if_ether.h>
/**
* struct ctx - Execution context
* @mode: Operation mode, qemu/UNIX domain socket or namespace/tap
* @debug: Enable debug mode
* @trace: Enable tracing (extra debug) mode
* @quiet: Don't print informational messages
* @foreground: Run in foreground, don't log to stderr by default
* @stderr: Force logging to stderr
* @nofile: Maximum number of open files (ulimit -n)
* @sock_path: Path for UNIX domain socket
* @pcap: Path for packet capture file
* @pid_file: Path to PID file, empty string if not configured
* @pasta_netns_fd: File descriptor for network namespace in pasta mode
* @no_netns_quit: In pasta mode, don't exit if fs-bound namespace is gone
* @netns_base: Base name for fs-bound namespace, if any, in pasta mode
* @netns_dir: Directory of fs-bound namespace, if any, in pasta mode
* @proc_net_tcp: Stored handles for /proc/net/tcp{,6} in init and ns
* @proc_net_udp: Stored handles for /proc/net/udp{,6} in init and ns
* @epollfd: File descriptor for epoll instance
* @fd_tap_listen: File descriptor for listening AF_UNIX socket, if any
* @fd_tap: AF_UNIX socket, tuntap device, or pre-opened socket
* @mac: Host MAC address
* @mac_guest: MAC address of guest or namespace, seen or configured
* @ifi4: Index of template interface for IPv4, 0 if IPv4 disabled
* @ip: IPv4 configuration
* @dns_search: DNS search list
* @ifi6: Index of template interface for IPv6, 0 if IPv6 disabled
* @ip6: IPv6 configuration
* @pasta_ifn: Name of namespace interface for pasta
* @pasta_ifn: Index of namespace interface for pasta
* @pasta_conf_ns: Configure namespace interface after creating it
* @no_tcp: Disable TCP operation
* @tcp: Context for TCP protocol handler
* @no_tcp: Disable UDP operation
* @udp: Context for UDP protocol handler
* @no_icmp: Disable ICMP operation
* @icmp: Context for ICMP protocol handler
* @mtu: MTU passed via DHCP/NDP
* @no_dns: Do not source/use DNS servers for any purpose
* @no_dns_search: Do not source/use domain search lists for any purpose
* @no_dhcp_dns: Do not assign any DNS server via DHCP/DHCPv6/NDP
* @no_dhcp_dns_search: Do not assign any DNS domain search via DHCP/DHCPv6/NDP
* @no_dhcp: Disable DHCP server
* @no_dhcpv6: Disable DHCPv6 server
* @no_ndp: Disable NDP handler altogether
* @no_ra: Disable router advertisements
* @no_map_gw: Don't map connections, untracked UDP to gateway to host
* @low_wmem: Low probed net.core.wmem_max
* @low_rmem: Low probed net.core.rmem_max
*/
struct ctx {
enum passt_modes mode;
int debug;
int trace;
int quiet;
int foreground;
int stderr;
int nofile;
char sock_path[UNIX_PATH_MAX];
char pcap[PATH_MAX];
char pid_file[PATH_MAX];
int one_off;
int pasta_netns_fd;
int no_netns_quit;
char netns_base[PATH_MAX];
char netns_dir[PATH_MAX];
int proc_net_tcp[IP_VERSIONS][2];
int proc_net_udp[IP_VERSIONS][2];
int epollfd;
int fd_tap_listen;
int fd_tap;
unsigned char mac[ETH_ALEN];
unsigned char mac_guest[ETH_ALEN];
unsigned int ifi4;
struct ip4_ctx ip4;
struct fqdn dns_search[MAXDNSRCH];
unsigned int ifi6;
struct ip6_ctx ip6;
char pasta_ifn[IF_NAMESIZE];
unsigned int pasta_ifi;
int pasta_conf_ns;
int no_tcp;
struct tcp_ctx tcp;
int no_udp;
struct udp_ctx udp;
int no_icmp;
struct icmp_ctx icmp;
int mtu;
int no_dns;
int no_dns_search;
int no_dhcp_dns;
int no_dhcp_dns_search;
int no_dhcp;
int no_dhcpv6;
int no_ndp;
int no_ra;
int no_map_gw;
int low_wmem;
int low_rmem;
};
void proto_update_l2_buf(const unsigned char *eth_d, const unsigned char *eth_s,
const struct in_addr *ip_da);
#endif /* PASST_H */
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