1f25327484
with minor changes to work around a bug in Cisco's IOS version 12.0 . 3.9-beta3 is much improved over 3.8, and is only labelled "beta" because of missing features, as opposed to instability or known bugs.
146 lines
3.8 KiB
C
146 lines
3.8 KiB
C
/*
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* The mrouted program is covered by the license in the accompanying file
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* named "LICENSE". Use of the mrouted program represents acceptance of
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* the terms and conditions listed in that file.
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*
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* The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
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* Leland Stanford Junior University.
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*
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*
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* ipip.c,v 3.8.4.6 1998/01/06 01:57:45 fenner Exp
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*/
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#include "defs.h"
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#ifndef lint
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static char rcsid[] = "@(#) $Id: \
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ipip.c,v 3.8.4.6 1998/01/06 01:57:45 fenner Exp $";
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#endif
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/*
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* Exported variables.
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*/
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#ifdef notyet
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int raw_socket; /* socket for raw network I/O */
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#endif
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/*
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*XXX For now, we just use the IGMP socket to send packets.
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* This is legal in BSD, because the protocol # is not checked
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* on raw sockets. The k_* interfaces need to gain a socket
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* argument so that we can call them on the raw_socket also.
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*/
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#define raw_socket igmp_socket
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/*
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* Private variables.
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*/
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static int rawid = 0;
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/*
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* Open and initialize the raw socket.
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*/
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void
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init_ipip()
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{
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#ifdef notyet
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if ((raw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
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log(LOG_ERR, errno, "Raw IP socket");
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#endif
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}
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/*
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* Allocate and fill in static IP header for encapsulating on a tunnel.
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*/
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void
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init_ipip_on_vif(v)
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struct uvif *v;
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{
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struct ip *ip;
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ip = v->uv_encap_hdr = (struct ip *)malloc(sizeof(struct ip));
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if (ip == NULL)
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log(LOG_ERR, 0, "out of memory");
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bzero(ip, sizeof(struct ip));
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/*
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* Fields zeroed that aren't filled in later:
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* - IP ID (let the kernel fill it in)
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* - Offset (we don't send fragments)
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* - Checksum (let the kernel fill it in)
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*/
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ip->ip_v = IPVERSION;
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ip->ip_hl = sizeof(struct ip) >> 2;
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ip->ip_tos = 0xc0; /* Internet Control */
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ip->ip_ttl = MAXTTL; /* applies to unicasts only */
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ip->ip_p = IPPROTO_IPIP;
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ip->ip_src.s_addr = v->uv_lcl_addr;
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ip->ip_dst.s_addr = v->uv_rmt_addr;
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}
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/*
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* Call build_igmp() to build an IGMP message in the output packet buffer.
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* Then fill in the fields of the IP packet that build_igmp() left for the
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* kernel to fill in, and encapsulate the original packet with the
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* pre-created ip header for this vif.
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*/
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void
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send_ipip(src, dst, type, code, group, datalen, v)
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u_int32 src, dst;
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int type, code;
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u_int32 group;
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int datalen;
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struct uvif *v;
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{
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struct msghdr msg;
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struct iovec iov[2];
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struct sockaddr_in sdst;
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struct ip *ip;
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build_igmp(src, dst, type, code, group, datalen);
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ip = (struct ip *)send_buf;
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#ifndef RAW_OUTPUT_IS_RAW
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ip->ip_len = htons(ip->ip_len);
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#endif
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ip->ip_id = htons(rawid++);
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ip->ip_sum = 0;
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ip->ip_sum = inet_cksum((u_short *)ip, ip->ip_hl << 2);
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ip = v->uv_encap_hdr;
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ip->ip_len = 2 * MIN_IP_HEADER_LEN + IGMP_MINLEN + datalen;
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#ifdef RAW_OUTPUT_IS_RAW
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ip->ip_len = htons(ip->ip_len);
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#endif
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bzero(&sdst, sizeof(sdst));
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sdst.sin_family = AF_INET;
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#ifdef HAVE_SA_LEN
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sdst.sin_len = sizeof(sdst);
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#endif
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sdst.sin_addr = ip->ip_dst;
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iov[0].iov_base = (caddr_t)v->uv_encap_hdr;
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iov[0].iov_len = sizeof(struct ip);
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iov[1].iov_base = (caddr_t)send_buf;
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iov[1].iov_len = MIN_IP_HEADER_LEN + IGMP_MINLEN + datalen;
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bzero(&msg, sizeof(msg));
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msg.msg_name = (caddr_t)&sdst;
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msg.msg_namelen = sizeof(sdst);
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msg.msg_iov = iov;
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msg.msg_iovlen = 2;
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if (sendmsg(raw_socket, &msg, 0) < 0) {
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if (errno == ENETDOWN)
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check_vif_state();
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else
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log(LOG_WARNING, errno,
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"sendmsg to %s on %s",
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inet_fmt(sdst.sin_addr.s_addr, s1), inet_fmt(src, s2));
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}
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IF_DEBUG(DEBUG_PKT|igmp_debug_kind(type, code))
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log(LOG_DEBUG, 0, "SENT %s from %-15s to %s encaped to %s",
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igmp_packet_kind(type, code), src == INADDR_ANY ? "INADDR_ANY" :
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inet_fmt(src, s1), inet_fmt(dst, s2),
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inet_fmt(sdst.sin_addr.s_addr, s3));
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}
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