687 lines
15 KiB
C
687 lines
15 KiB
C
/*
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* Copyright (C) 2006-2009 Tobias Brunner
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* Copyright (C) 2006 Daniel Roethlisberger
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* Copyright (C) 2005-2010 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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/* for struct in6_pktinfo */
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#define _GNU_SOURCE
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#ifdef __sun
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#define _XPG4_2
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#define __EXTENSIONS__
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#endif
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#include "socket_default_socket.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <netinet/in_systm.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/udp.h>
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#include <net/if.h>
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#ifdef __APPLE__
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#include <sys/sysctl.h>
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#endif
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#include <daemon.h>
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#include <threading/thread.h>
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/* Maximum size of a packet */
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#define MAX_PACKET 5000
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/* length of non-esp marker */
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#define MARKER_LEN sizeof(u_int32_t)
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/* from linux/udp.h */
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#ifndef UDP_ENCAP
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#define UDP_ENCAP 100
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#endif /*UDP_ENCAP*/
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#ifndef UDP_ENCAP_ESPINUDP
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#define UDP_ENCAP_ESPINUDP 2
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#endif /*UDP_ENCAP_ESPINUDP*/
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/* these are not defined on some platforms */
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#ifndef SOL_IP
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#define SOL_IP IPPROTO_IP
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#endif
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#ifndef SOL_IPV6
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#define SOL_IPV6 IPPROTO_IPV6
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#endif
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#ifndef SOL_UDP
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#define SOL_UDP IPPROTO_UDP
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#endif
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/* IPV6_RECVPKTINFO is defined in RFC 3542 which obsoletes RFC 2292 that
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* previously defined IPV6_PKTINFO */
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#ifndef IPV6_RECVPKTINFO
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#define IPV6_RECVPKTINFO IPV6_PKTINFO
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#endif
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#ifndef IN6ADDR_ANY_INIT
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#define IN6ADDR_ANY_INIT {{{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}}}
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#endif
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#ifndef HAVE_IN6ADDR_ANY
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static const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
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#endif
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typedef struct private_socket_default_socket_t private_socket_default_socket_t;
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/**
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* Private data of an socket_t object
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*/
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struct private_socket_default_socket_t {
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/**
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* public functions
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*/
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socket_default_socket_t public;
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/**
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* IPv4 socket (500)
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*/
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int ipv4;
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/**
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* IPv4 socket for NATT (4500)
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*/
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int ipv4_natt;
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/**
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* IPv6 socket (500)
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*/
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int ipv6;
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/**
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* IPv6 socket for NATT (4500)
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*/
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int ipv6_natt;
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};
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METHOD(socket_t, receiver, status_t,
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private_socket_default_socket_t *this, packet_t **packet)
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{
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char buffer[MAX_PACKET];
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chunk_t data;
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packet_t *pkt;
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host_t *source = NULL, *dest = NULL;
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int bytes_read = 0, data_offset;
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bool oldstate;
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fd_set rfds;
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int max_fd = 0, selected = 0;
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u_int16_t port = 0;
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FD_ZERO(&rfds);
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if (this->ipv4)
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{
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FD_SET(this->ipv4, &rfds);
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}
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if (this->ipv4_natt)
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{
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FD_SET(this->ipv4_natt, &rfds);
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}
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if (this->ipv6)
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{
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FD_SET(this->ipv6, &rfds);
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}
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if (this->ipv6_natt)
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{
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FD_SET(this->ipv6_natt, &rfds);
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}
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max_fd = max(max(this->ipv4, this->ipv4_natt), max(this->ipv6, this->ipv6_natt));
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DBG2(DBG_NET, "waiting for data on sockets");
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oldstate = thread_cancelability(TRUE);
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if (select(max_fd + 1, &rfds, NULL, NULL, NULL) <= 0)
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{
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thread_cancelability(oldstate);
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return FAILED;
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}
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thread_cancelability(oldstate);
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if (FD_ISSET(this->ipv4, &rfds))
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{
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port = IKEV2_UDP_PORT;
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selected = this->ipv4;
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}
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if (FD_ISSET(this->ipv4_natt, &rfds))
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{
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port = IKEV2_NATT_PORT;
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selected = this->ipv4_natt;
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}
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if (FD_ISSET(this->ipv6, &rfds))
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{
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port = IKEV2_UDP_PORT;
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selected = this->ipv6;
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}
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if (FD_ISSET(this->ipv6_natt, &rfds))
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{
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port = IKEV2_NATT_PORT;
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selected = this->ipv6_natt;
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}
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if (selected)
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{
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struct msghdr msg;
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struct cmsghdr *cmsgptr;
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struct iovec iov;
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char ancillary[64];
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union {
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struct sockaddr_in in4;
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struct sockaddr_in6 in6;
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} src;
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msg.msg_name = &src;
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msg.msg_namelen = sizeof(src);
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iov.iov_base = buffer;
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iov.iov_len = sizeof(buffer);
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = ancillary;
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msg.msg_controllen = sizeof(ancillary);
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msg.msg_flags = 0;
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bytes_read = recvmsg(selected, &msg, 0);
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if (bytes_read < 0)
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{
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DBG1(DBG_NET, "error reading socket: %s", strerror(errno));
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return FAILED;
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}
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DBG3(DBG_NET, "received packet %b", buffer, bytes_read);
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if (bytes_read < MARKER_LEN)
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{
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DBG3(DBG_NET, "received packet too short (%d bytes)",
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bytes_read);
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return FAILED;
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}
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/* read ancillary data to get destination address */
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for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL;
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cmsgptr = CMSG_NXTHDR(&msg, cmsgptr))
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{
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if (cmsgptr->cmsg_len == 0)
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{
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DBG1(DBG_NET, "error reading ancillary data");
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return FAILED;
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}
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#ifdef HAVE_IN6_PKTINFO
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if (cmsgptr->cmsg_level == SOL_IPV6 &&
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cmsgptr->cmsg_type == IPV6_PKTINFO)
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{
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struct in6_pktinfo *pktinfo;
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pktinfo = (struct in6_pktinfo*)CMSG_DATA(cmsgptr);
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struct sockaddr_in6 dst;
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memset(&dst, 0, sizeof(dst));
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memcpy(&dst.sin6_addr, &pktinfo->ipi6_addr, sizeof(dst.sin6_addr));
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dst.sin6_family = AF_INET6;
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dst.sin6_port = htons(port);
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dest = host_create_from_sockaddr((sockaddr_t*)&dst);
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}
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#endif /* HAVE_IN6_PKTINFO */
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if (cmsgptr->cmsg_level == SOL_IP &&
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#ifdef IP_PKTINFO
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cmsgptr->cmsg_type == IP_PKTINFO
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#elif defined(IP_RECVDSTADDR)
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cmsgptr->cmsg_type == IP_RECVDSTADDR
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#else
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FALSE
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#endif
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)
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{
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struct in_addr *addr;
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struct sockaddr_in dst;
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#ifdef IP_PKTINFO
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struct in_pktinfo *pktinfo;
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pktinfo = (struct in_pktinfo*)CMSG_DATA(cmsgptr);
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addr = &pktinfo->ipi_addr;
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#elif defined(IP_RECVDSTADDR)
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addr = (struct in_addr*)CMSG_DATA(cmsgptr);
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#endif
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memset(&dst, 0, sizeof(dst));
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memcpy(&dst.sin_addr, addr, sizeof(dst.sin_addr));
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dst.sin_family = AF_INET;
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dst.sin_port = htons(port);
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dest = host_create_from_sockaddr((sockaddr_t*)&dst);
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}
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if (dest)
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{
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break;
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}
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}
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if (dest == NULL)
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{
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DBG1(DBG_NET, "error reading IP header");
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return FAILED;
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}
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source = host_create_from_sockaddr((sockaddr_t*)&src);
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pkt = packet_create();
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pkt->set_source(pkt, source);
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pkt->set_destination(pkt, dest);
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DBG2(DBG_NET, "received packet: from %#H to %#H", source, dest);
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data_offset = 0;
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/* remove non esp marker */
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if (dest->get_port(dest) == IKEV2_NATT_PORT)
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{
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data_offset += MARKER_LEN;
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}
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/* fill in packet */
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data.len = bytes_read - data_offset;
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data.ptr = malloc(data.len);
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memcpy(data.ptr, buffer + data_offset, data.len);
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pkt->set_data(pkt, data);
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}
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else
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{
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/* oops, shouldn't happen */
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return FAILED;
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}
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/* return packet */
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*packet = pkt;
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return SUCCESS;
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}
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METHOD(socket_t, sender, status_t,
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private_socket_default_socket_t *this, packet_t *packet)
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{
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int sport, skt, family;
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ssize_t bytes_sent;
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chunk_t data, marked;
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host_t *src, *dst;
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struct msghdr msg;
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struct cmsghdr *cmsg;
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struct iovec iov;
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src = packet->get_source(packet);
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dst = packet->get_destination(packet);
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data = packet->get_data(packet);
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DBG2(DBG_NET, "sending packet: from %#H to %#H", src, dst);
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/* send data */
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sport = src->get_port(src);
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family = dst->get_family(dst);
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if (sport == IKEV2_UDP_PORT)
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{
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if (family == AF_INET)
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{
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skt = this->ipv4;
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}
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else
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{
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skt = this->ipv6;
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}
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}
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else if (sport == IKEV2_NATT_PORT)
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{
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if (family == AF_INET)
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{
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skt = this->ipv4_natt;
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}
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else
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{
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skt = this->ipv6_natt;
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}
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/* NAT keepalives without marker */
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if (data.len != 1 || data.ptr[0] != 0xFF)
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{
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/* add non esp marker to packet */
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if (data.len > MAX_PACKET - MARKER_LEN)
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{
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DBG1(DBG_NET, "unable to send packet: it's too big (%d bytes)",
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data.len);
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return FAILED;
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}
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marked = chunk_alloc(data.len + MARKER_LEN);
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memset(marked.ptr, 0, MARKER_LEN);
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memcpy(marked.ptr + MARKER_LEN, data.ptr, data.len);
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/* let the packet do the clean up for us */
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packet->set_data(packet, marked);
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data = marked;
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}
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}
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else
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{
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DBG1(DBG_NET, "unable to locate a send socket for port %d", sport);
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return FAILED;
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}
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memset(&msg, 0, sizeof(struct msghdr));
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msg.msg_name = dst->get_sockaddr(dst);;
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msg.msg_namelen = *dst->get_sockaddr_len(dst);
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iov.iov_base = data.ptr;
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iov.iov_len = data.len;
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_flags = 0;
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if (!src->is_anyaddr(src))
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{
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if (family == AF_INET)
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{
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#if defined(IP_PKTINFO) || defined(IP_SENDSRCADDR)
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struct in_addr *addr;
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struct sockaddr_in *sin;
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#ifdef IP_PKTINFO
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char buf[CMSG_SPACE(sizeof(struct in_pktinfo))];
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struct in_pktinfo *pktinfo;
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#elif defined(IP_SENDSRCADDR)
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char buf[CMSG_SPACE(sizeof(struct in_addr))];
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#endif
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msg.msg_control = buf;
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msg.msg_controllen = sizeof(buf);
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cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_level = SOL_IP;
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#ifdef IP_PKTINFO
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cmsg->cmsg_type = IP_PKTINFO;
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cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
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pktinfo = (struct in_pktinfo*)CMSG_DATA(cmsg);
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memset(pktinfo, 0, sizeof(struct in_pktinfo));
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addr = &pktinfo->ipi_spec_dst;
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#elif defined(IP_SENDSRCADDR)
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cmsg->cmsg_type = IP_SENDSRCADDR;
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cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_addr));
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addr = (struct in_addr*)CMSG_DATA(cmsg);
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#endif
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sin = (struct sockaddr_in*)src->get_sockaddr(src);
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memcpy(addr, &sin->sin_addr, sizeof(struct in_addr));
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#endif /* IP_PKTINFO || IP_SENDSRCADDR */
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}
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#ifdef HAVE_IN6_PKTINFO
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else
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{
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char buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
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struct in6_pktinfo *pktinfo;
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struct sockaddr_in6 *sin;
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msg.msg_control = buf;
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msg.msg_controllen = sizeof(buf);
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cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_level = SOL_IPV6;
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cmsg->cmsg_type = IPV6_PKTINFO;
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cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
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pktinfo = (struct in6_pktinfo*)CMSG_DATA(cmsg);
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memset(pktinfo, 0, sizeof(struct in6_pktinfo));
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sin = (struct sockaddr_in6*)src->get_sockaddr(src);
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memcpy(&pktinfo->ipi6_addr, &sin->sin6_addr, sizeof(struct in6_addr));
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}
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#endif /* HAVE_IN6_PKTINFO */
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}
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bytes_sent = sendmsg(skt, &msg, 0);
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if (bytes_sent != data.len)
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{
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DBG1(DBG_NET, "error writing to socket: %s", strerror(errno));
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return FAILED;
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}
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return SUCCESS;
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}
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/**
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* open a socket to send and receive packets
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*/
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static int open_socket(private_socket_default_socket_t *this,
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int family, u_int16_t port)
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{
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int on = TRUE;
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struct sockaddr_storage addr;
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socklen_t addrlen;
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u_int sol, pktinfo = 0;
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int skt;
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memset(&addr, 0, sizeof(addr));
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/* precalculate constants depending on address family */
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switch (family)
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{
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case AF_INET:
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{
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struct sockaddr_in *sin = (struct sockaddr_in *)&addr;
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sin->sin_family = AF_INET;
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sin->sin_addr.s_addr = INADDR_ANY;
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sin->sin_port = htons(port);
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addrlen = sizeof(struct sockaddr_in);
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sol = SOL_IP;
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#ifdef IP_PKTINFO
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pktinfo = IP_PKTINFO;
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#elif defined(IP_RECVDSTADDR)
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pktinfo = IP_RECVDSTADDR;
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#endif
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break;
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}
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case AF_INET6:
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{
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&addr;
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sin6->sin6_family = AF_INET6;
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memcpy(&sin6->sin6_addr, &in6addr_any, sizeof(in6addr_any));
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sin6->sin6_port = htons(port);
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addrlen = sizeof(struct sockaddr_in6);
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sol = SOL_IPV6;
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pktinfo = IPV6_RECVPKTINFO;
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break;
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}
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default:
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return 0;
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}
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skt = socket(family, SOCK_DGRAM, IPPROTO_UDP);
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if (skt < 0)
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{
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DBG1(DBG_NET, "could not open socket: %s", strerror(errno));
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return 0;
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}
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if (setsockopt(skt, SOL_SOCKET, SO_REUSEADDR, (void*)&on, sizeof(on)) < 0)
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{
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DBG1(DBG_NET, "unable to set SO_REUSEADDR on socket: %s", strerror(errno));
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close(skt);
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return 0;
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}
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/* bind the socket */
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if (bind(skt, (struct sockaddr *)&addr, addrlen) < 0)
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{
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DBG1(DBG_NET, "unable to bind socket: %s", strerror(errno));
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close(skt);
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return 0;
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}
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/* get additional packet info on receive */
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if (pktinfo > 0)
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{
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if (setsockopt(skt, sol, pktinfo, &on, sizeof(on)) < 0)
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{
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|
DBG1(DBG_NET, "unable to set IP_PKTINFO on socket: %s", strerror(errno));
|
|
close(skt);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
#ifndef __APPLE__
|
|
{
|
|
/* enable UDP decapsulation globally, only for one socket needed */
|
|
int type = UDP_ENCAP_ESPINUDP;
|
|
if (family == AF_INET && port == IKEV2_NATT_PORT &&
|
|
setsockopt(skt, SOL_UDP, UDP_ENCAP, &type, sizeof(type)) < 0)
|
|
{
|
|
DBG1(DBG_NET, "unable to set UDP_ENCAP: %s", strerror(errno));
|
|
}
|
|
}
|
|
#endif
|
|
return skt;
|
|
}
|
|
|
|
/**
|
|
* enumerator for underlying sockets
|
|
*/
|
|
typedef struct {
|
|
/** implements enumerator_t */
|
|
enumerator_t public;
|
|
/** sockets we enumerate */
|
|
private_socket_default_socket_t *socket;
|
|
/** counter */
|
|
int index;
|
|
} socket_enumerator_t;
|
|
|
|
/**
|
|
* enumerate function for socket_enumerator_t
|
|
*/
|
|
static bool enumerate(socket_enumerator_t *this, int *fd, int *family, int *port)
|
|
{
|
|
static const struct {
|
|
int fd_offset;
|
|
int family;
|
|
int port;
|
|
} sockets[] = {
|
|
{ offsetof(private_socket_default_socket_t, ipv4),
|
|
AF_INET, IKEV2_UDP_PORT },
|
|
{ offsetof(private_socket_default_socket_t, ipv6),
|
|
AF_INET6, IKEV2_UDP_PORT },
|
|
{ offsetof(private_socket_default_socket_t, ipv4_natt),
|
|
AF_INET, IKEV2_NATT_PORT },
|
|
{ offsetof(private_socket_default_socket_t, ipv6_natt),
|
|
AF_INET6, IKEV2_NATT_PORT }
|
|
};
|
|
|
|
while(++this->index < countof(sockets))
|
|
{
|
|
int sock = *(int*)((char*)this->socket + sockets[this->index].fd_offset);
|
|
if (!sock)
|
|
{
|
|
continue;
|
|
}
|
|
*fd = sock;
|
|
*family = sockets[this->index].family;
|
|
*port = sockets[this->index].port;
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
METHOD(socket_t, create_enumerator, enumerator_t*,
|
|
private_socket_default_socket_t *this)
|
|
{
|
|
socket_enumerator_t *enumerator;
|
|
|
|
enumerator = malloc_thing(socket_enumerator_t);
|
|
enumerator->index = -1;
|
|
enumerator->socket = this;
|
|
enumerator->public.enumerate = (void*)enumerate;
|
|
enumerator->public.destroy = (void*)free;
|
|
return &enumerator->public;
|
|
}
|
|
|
|
METHOD(socket_default_socket_t, destroy, void,
|
|
private_socket_default_socket_t *this)
|
|
{
|
|
if (this->ipv4)
|
|
{
|
|
close(this->ipv4);
|
|
}
|
|
if (this->ipv4_natt)
|
|
{
|
|
close(this->ipv4_natt);
|
|
}
|
|
if (this->ipv6)
|
|
{
|
|
close(this->ipv6);
|
|
}
|
|
if (this->ipv6_natt)
|
|
{
|
|
close(this->ipv6_natt);
|
|
}
|
|
free(this);
|
|
}
|
|
|
|
/*
|
|
* See header for description
|
|
*/
|
|
socket_default_socket_t *socket_default_socket_create()
|
|
{
|
|
private_socket_default_socket_t *this;
|
|
|
|
INIT(this,
|
|
.public = {
|
|
.socket = {
|
|
.send = _sender,
|
|
.receive = _receiver,
|
|
.create_enumerator = _create_enumerator,
|
|
},
|
|
.destroy = _destroy,
|
|
},
|
|
);
|
|
|
|
#ifdef __APPLE__
|
|
{
|
|
int natt_port = IKEV2_NATT_PORT;
|
|
if (sysctlbyname("net.inet.ipsec.esp_port", NULL, NULL, &natt_port,
|
|
sizeof(natt_port)) != 0)
|
|
{
|
|
DBG1(DBG_NET, "could not set net.inet.ipsec.esp_port to %d: %s",
|
|
natt_port, strerror(errno));
|
|
}
|
|
}
|
|
#endif
|
|
|
|
this->ipv4 = open_socket(this, AF_INET, IKEV2_UDP_PORT);
|
|
if (this->ipv4 == 0)
|
|
{
|
|
DBG1(DBG_NET, "could not open IPv4 socket, IPv4 disabled");
|
|
}
|
|
else
|
|
{
|
|
this->ipv4_natt = open_socket(this, AF_INET, IKEV2_NATT_PORT);
|
|
if (this->ipv4_natt == 0)
|
|
{
|
|
DBG1(DBG_NET, "could not open IPv4 NAT-T socket");
|
|
}
|
|
}
|
|
|
|
this->ipv6 = open_socket(this, AF_INET6, IKEV2_UDP_PORT);
|
|
if (this->ipv6 == 0)
|
|
{
|
|
DBG1(DBG_NET, "could not open IPv6 socket, IPv6 disabled");
|
|
}
|
|
else
|
|
{
|
|
this->ipv6_natt = open_socket(this, AF_INET6, IKEV2_NATT_PORT);
|
|
if (this->ipv6_natt == 0)
|
|
{
|
|
DBG1(DBG_NET, "could not open IPv6 NAT-T socket");
|
|
}
|
|
}
|
|
|
|
if (!this->ipv4 && !this->ipv6)
|
|
{
|
|
DBG1(DBG_NET, "could not create any sockets");
|
|
destroy(this);
|
|
return NULL;
|
|
}
|
|
return &this->public;
|
|
}
|
|
|