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/* ip packet extracted from acquire, for libreswan
*
* Copyright (C) 2020-2021 Andrew Cagney
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Library General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <https://www.gnu.org/licenses/lgpl-2.1.txt>.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
* License for more details.
*
*/
#ifndef IP_PACKET_H
#define IP_PACKET_H
#include "ip_bytes.h"
#include "ip_port.h"
#include "ip_endpoint.h"
#include "ip_selector.h"
struct ip_protocol;
struct jambuf;
/*
* Packet between two endpoints.
*/
typedef struct {
bool is_set;
const struct ip_info *info; /* 0, 4, 6 */
const struct ip_protocol *protocol;
struct {
struct ip_bytes bytes;
/*
* Note: An acquire triggered by a packet that did not
* specify the source port (i.e., it's ephemeral) will
* have .src.hport set to zero.
*/
int hport;
} src, dst;
/*XXX sec_label?*/
} ip_packet;
#define PRI_PACKET "<packet-%s:%s["PRI_IP_BYTES"]:%u-%s->["PRI_IP_BYTES"]:%u>"
#define pri_packet(S) \
((S)->is_set ? "set" : "unset"), \
(S)->info != NULL ? (S)->info->ip_name : "IPv?", \
pri_ip_bytes((S)->src.bytes), \
(S)->src.hport, \
(S)->protocol != NULL ? (S)->protocol->name : "<null>", \
pri_ip_bytes((S)->dst.bytes), \
(S)->dst.hport
void pexpect_packet(const ip_packet *s, where_t where);
#define ppacket(S) pexpect_packet(S, HERE)
ip_packet packet_from_raw(where_t where,
/* AFI determines meaning of ... */
const struct ip_info *afi,
/* ... BYTES */
const struct ip_bytes *src_bytes,
const struct ip_bytes *dst_bytes,
/* PROTOCOL determines meaning of ... */
const struct ip_protocol *protocol,
/* ... PORTs */
const ip_port src_port,
const ip_port dst_port);
/*
* Magic values.
*
* XXX: While the headers call the all-zero address "ANY" (INADDR_ANY,
* IN6ADDR_ANY_INIT), the headers also refer to the IPv6 value as
* unspecified (for instance IN6_IS_ADDR_UNSPECIFIED()) leaving the
* term "unspecified" underspecified.
*
* Consequently an AF_UNSPEC address (i.e., uninitialized or unset),
* is identified by *_unset().
*/
extern const ip_packet unset_packet;
/* attributes */
ip_address packet_src_address(const ip_packet packet);
ip_address packet_dst_address(const ip_packet packet);
/* packet_src_endpoint() N/A as as src port can be zero */
ip_endpoint packet_dst_endpoint(const ip_packet packet);
ip_selector packet_src_selector(const ip_packet packet);
ip_selector packet_dst_selector(const ip_packet packet);
/*
* Output.
*/
typedef struct {
/* way over size? */
char buf[sizeof(endpoint_buf) + sizeof("-->") + sizeof(protocol_buf) + sizeof(endpoint_buf) + 1/*canary*/];
} packet_buf;
size_t jam_packet(struct jambuf *buf, const ip_packet *packet);
const char *str_packet(const ip_packet *packet, packet_buf *buf);
#endif
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