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passt/passt.h
David Gibson 4b2e018d70 Allow different external interfaces for IPv4 and IPv6 connectivity 
It's quite plausible for a host to have both IPv4 and IPv6 connectivity,
but only via different interfaces.  For example, this will happen in the
case that IPv6 connectivity is via a tunnel (e.g. 6in4 or 6rd).  It would
also happen in the case that IPv4 access is via a tunnel on an otherwise
IPv6 only local network, which is a setup that might become more common in
the post IPv4 address exhaustion world.

In turns out there's no real need for passt/pasta to get its IPv4 and IPv6
connectivity via the same interface, so we can handle this situation fairly
easily.  Change the core to allow eparate external interfaces for IPv4 and
IPv6.  We don't actually set these separately for now.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2022-07-30 21:50:41 +02:00

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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 "packet.h"
#include "icmp.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 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 (1 << 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 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
* @uid: UID we should drop to, if started as root
* @gid: GID we should drop to, if started as root
* @pasta_netns_fd: File descriptor for network namespace in pasta mode
* @pasta_userns_fd: Descriptor for user namespace to join, -1 once joined
* @netns_only: In pasta mode, don't join or create a user namespace
* @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: File descriptor for AF_UNIX socket or tuntap device
* @mac: Host MAC address
* @mac_guest: MAC address of guest or namespace, seen or configured
* @v4: Enable IPv4 transport
* @ifi4: Index of routable interface for IPv4
* @addr4: IPv4 address for external, routable interface
* @addr4_seen: Latest IPv4 address seen as source from tap
* @mask4: IPv4 netmask, network order
* @gw4: Default IPv4 gateway, network order
* @dns4: IPv4 DNS addresses, zero-terminated, network order
* @dns4_fwd: Address forwarded (UDP) to first IPv4 DNS, network order
* @dns_search: DNS search list
* @v6: Enable IPv6 transport
* @ifi6: Index of routable interface for IPv6
* @addr6: IPv6 address for external, routable interface
* @addr6_ll: Link-local IPv6 address on external, routable interface
* @addr6_seen: Latest IPv6 global/site address seen as source from tap
* @addr6_ll_seen: Latest IPv6 link-local address seen as source from tap
* @gw6: Default IPv6 gateway
* @dns6: IPv6 DNS addresses, zero-terminated
* @dns6_fwd: Address forwarded (UDP) to first IPv6 DNS, network order
* @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];
uid_t uid;
uid_t gid;
int pasta_netns_fd;
int pasta_userns_fd;
int netns_only;
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];
int v4;
unsigned int ifi4;
uint32_t addr4;
uint32_t addr4_seen;
uint32_t mask4;
uint32_t gw4;
uint32_t dns4[MAXNS + 1];
uint32_t dns4_fwd;
struct fqdn dns_search[MAXDNSRCH];
int v6;
unsigned int ifi6;
struct in6_addr addr6;
struct in6_addr addr6_ll;
struct in6_addr addr6_seen;
struct in6_addr addr6_ll_seen;
struct in6_addr gw6;
struct in6_addr dns6[MAXNS + 1];
struct in6_addr dns6_fwd;
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 uint32_t *ip_da);
#endif /* PASST_H */
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