public inbox for passt-dev@passt.top
 help / color / mirror / code / Atom feed
blob 023b7e06e2ab6c2bd4e5aadc65f33e00ae4021f6 9123 bytes (raw)

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
 
/* SPDX-License-Identifier: GPL-2.0-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 <assert.h>
#include <sys/epoll.h>

#include "packet.h"
#include "icmp.h"
#include "port_fwd.h"
#include "tcp.h"
#include "udp.h"

/**
 * enum epoll_type - Different types of fds we poll over
 */
enum epoll_type {
	/* Special value to indicate an invalid type */
	EPOLL_TYPE_NONE = 0,
	/* Connected TCP sockets */
	EPOLL_TYPE_TCP,
	/* Listening TCP sockets */
	EPOLL_TYPE_TCP_LISTEN,
	/* timerfds used for TCP timers */
	EPOLL_TYPE_TCP_TIMER,
	/* UDP sockets */
	EPOLL_TYPE_UDP,
	/* IPv4 ICMP sockets */
	EPOLL_TYPE_ICMP,
	/* ICMPv6 sockets */
	EPOLL_TYPE_ICMPV6,
	/* inotify fd watching for end of netns (pasta) */
	EPOLL_TYPE_NSQUIT,
	/* tuntap character device */
	EPOLL_TYPE_TAP_PASTA,
	/* socket connected to qemu  */
	EPOLL_TYPE_TAP_PASST,
	/* socket listening for qemu socket connections */
	EPOLL_TYPE_TAP_LISTEN,

	EPOLL_TYPE_MAX = EPOLL_TYPE_TAP_LISTEN,
};

/**
 * union epoll_ref - Breakdown of reference for epoll fd bookkeeping
 * @type:	Type of fd (tells us what to do with events)
 * @fd:		File descriptor number (implies < 2^24 total descriptors)
 * @tcp:	TCP-specific reference part (connected sockets)
 * @tcp_listen:	TCP-specific reference part (listening sockets)
 * @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 {
		enum epoll_type type:8;
#define FD_REF_BITS		24
#define FD_REF_MAX		MAX_FROM_BITS(FD_REF_BITS)
		int32_t		fd:FD_REF_BITS;
		union {
			union tcp_epoll_ref tcp;
			union tcp_listen_epoll_ref tcp_listen;
			union udp_epoll_ref udp;
			union icmp_epoll_ref icmp;
			uint32_t data;
		};
	};
	uint64_t u64;
};
static_assert(sizeof(union epoll_ref) <= sizeof(union epoll_data),
	      "epoll_ref must have same size as epoll_data");

#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 *epoll_type_str[];
#define EPOLL_TYPE_STR(n)						\
	(((uint8_t)(n) <= EPOLL_TYPE_MAX && epoll_type_str[(n)]) ?	\
	                                    epoll_type_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
 * @addr_out:		Optional source address for outbound traffic
 * @ifname_out:		Optional interface name to bind outbound sockets to
 */
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 in_addr addr_out;
	char ifname_out[IFNAMSIZ];
};

/**
 * 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
 * @addr_out:		Optional source address for outbound traffic
 * @ifname_out:		Optional interface name to bind outbound sockets to
 */
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;

	struct in6_addr addr_out;
	char ifname_out[IFNAMSIZ];
};

#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
 * @force_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_ifi:		Index of namespace interface for pasta
 * @pasta_conf_ns:	Configure namespace after creating it
 * @no_copy_routes:	Don't copy all routes when configuring target namespace
 * @no_copy_addrs:	Don't copy all addresses when configuring namespace
 * @flow_count:		Number of tracked packet flows (connections etc.)
 * @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 force_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_copy_routes;
	int no_copy_addrs;

	unsigned flow_count;

	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);

#endif /* PASST_H */

debug log:

solving 023b7e0 ...
found 023b7e0 in https://archives.passt.top/passt-dev/20230828054146.48673-3-david@gibson.dropbear.id.au/
found 282bd1a in https://passt.top/passt
preparing index
index prepared:
100644 282bd1a89805d9b1c607ee2b80d00e5e92e1354c	passt.h

applying [1/1] https://archives.passt.top/passt-dev/20230828054146.48673-3-david@gibson.dropbear.id.au/
diff --git a/passt.h b/passt.h
index 282bd1a..023b7e0 100644

Checking patch passt.h...
Applied patch passt.h cleanly.

index at:
100644 023b7e06e2ab6c2bd4e5aadc65f33e00ae4021f6	passt.h

Code repositories for project(s) associated with this public inbox

	https://passt.top/passt

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for IMAP folder(s).