diff options
Diffstat (limited to 'c/src/exec/libnetworking/netinet/ip_input.c')
| -rw-r--r-- | c/src/exec/libnetworking/netinet/ip_input.c | 1488 |
1 files changed, 0 insertions, 1488 deletions
diff --git a/c/src/exec/libnetworking/netinet/ip_input.c b/c/src/exec/libnetworking/netinet/ip_input.c deleted file mode 100644 index 238e10cf6b..0000000000 --- a/c/src/exec/libnetworking/netinet/ip_input.c +++ /dev/null @@ -1,1488 +0,0 @@ -/* - * Copyright (c) 1982, 1986, 1988, 1993 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 - * $Id$ - * $ANA: ip_input.c,v 1.5 1996/09/18 14:34:59 wollman Exp $ - */ - -#define _IP_VHL - -#include "opt_ipfw.h" - -#include <stddef.h> - -#include <sys/param.h> -#include <sys/systm.h> -#include <sys/malloc.h> -#include <sys/mbuf.h> -#include <sys/domain.h> -#include <sys/protosw.h> -#include <sys/socket.h> -#include <sys/errno.h> -#include <sys/time.h> -#include <sys/kernel.h> -#include <sys/syslog.h> -#include <sys/sysctl.h> - -#include <net/if.h> -#include <net/if_dl.h> -#include <net/route.h> -#include <net/netisr.h> - -#include <netinet/in.h> -#include <netinet/in_systm.h> -#include <netinet/in_var.h> -#include <netinet/ip.h> -#include <netinet/in_pcb.h> -#include <netinet/in_var.h> -#include <netinet/ip_var.h> -#include <netinet/ip_icmp.h> -#include <machine/in_cksum.h> - -#include <sys/socketvar.h> - -#ifdef IPFIREWALL -#include <netinet/ip_fw.h> -#endif - -int rsvp_on = 0; -static int ip_rsvp_on; -struct socket *ip_rsvpd; - -static int ipforwarding = 0; -SYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_RW, - &ipforwarding, 0, ""); - -static int ipsendredirects = 1; /* XXX */ -SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_RW, - &ipsendredirects, 0, ""); - -int ip_defttl = IPDEFTTL; -SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_RW, - &ip_defttl, 0, ""); - -static int ip_dosourceroute = 0; -SYSCTL_INT(_net_inet_ip, IPCTL_SOURCEROUTE, sourceroute, CTLFLAG_RW, - &ip_dosourceroute, 0, ""); - -static int ip_acceptsourceroute = 0; -SYSCTL_INT(_net_inet_ip, IPCTL_ACCEPTSOURCEROUTE, accept_sourceroute, - CTLFLAG_RW, &ip_acceptsourceroute, 0, ""); -#ifdef DIAGNOSTIC -static int ipprintfs = 0; -#endif - -extern struct domain inetdomain; -extern struct protosw inetsw[]; -u_char ip_protox[IPPROTO_MAX]; -static int ipqmaxlen = IFQ_MAXLEN; -struct in_ifaddr *in_ifaddr; /* first inet address */ -struct ifqueue ipintrq; -SYSCTL_INT(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen, CTLFLAG_RD, - &ipintrq.ifq_maxlen, 0, ""); -SYSCTL_INT(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops, CTLFLAG_RD, - &ipintrq.ifq_drops, 0, ""); - -struct ipstat ipstat; - -/* Packet reassembly stuff */ -#define IPREASS_NHASH_LOG2 6 -#define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2) -#define IPREASS_HMASK (IPREASS_NHASH - 1) -#define IPREASS_HASH(x,y) \ - (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK) - -static struct ipq ipq[IPREASS_NHASH]; -static int nipq = 0; /* total # of reass queues */ -static int maxnipq; - -#ifdef IPCTL_DEFMTU -SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW, - &ip_mtu, 0, ""); -#endif - -#if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1 -#undef COMPAT_IPFW -#define COMPAT_IPFW 1 -#else -#undef COMPAT_IPFW -#endif - -#ifdef COMPAT_IPFW -/* Firewall hooks */ -ip_fw_chk_t *ip_fw_chk_ptr; -ip_fw_ctl_t *ip_fw_ctl_ptr; - -/* IP Network Address Translation (NAT) hooks */ -ip_nat_t *ip_nat_ptr; -ip_nat_ctl_t *ip_nat_ctl_ptr; -#endif - -/* - * We need to save the IP options in case a protocol wants to respond - * to an incoming packet over the same route if the packet got here - * using IP source routing. This allows connection establishment and - * maintenance when the remote end is on a network that is not known - * to us. - */ -static int ip_nhops = 0; -static struct ip_srcrt { - struct in_addr dst; /* final destination */ - char nop; /* one NOP to align */ - char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */ - struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; -} ip_srcrt; - -#ifdef IPDIVERT -/* - * Shared variable between ip_input() and ip_reass() to communicate - * about which packets, once assembled from fragments, get diverted, - * and to which port. - */ -static u_short frag_divert_port; -#endif - -static void save_rte __P((u_char *, struct in_addr)); -static void ip_deq __P((struct ipasfrag *)); -static int ip_dooptions __P((struct mbuf *)); -static void ip_enq __P((struct ipasfrag *, struct ipasfrag *)); -static void ip_forward __P((struct mbuf *, int)); -static void ip_freef __P((struct ipq *)); -static struct ip * - ip_reass __P((struct ipasfrag *, struct ipq *, struct ipq *)); -static struct in_ifaddr * - ip_rtaddr __P((struct in_addr)); -void ipintr __P((void)); -/* - * IP initialization: fill in IP protocol switch table. - * All protocols not implemented in kernel go to raw IP protocol handler. - */ -void -ip_init() -{ - register struct protosw *pr; - register int i; - - pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); - if (pr == 0) - panic("ip_init"); - for (i = 0; i < IPPROTO_MAX; i++) - ip_protox[i] = pr - inetsw; - for (pr = inetdomain.dom_protosw; - pr < inetdomain.dom_protoswNPROTOSW; pr++) - if (pr->pr_domain->dom_family == PF_INET && - pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) - ip_protox[pr->pr_protocol] = pr - inetsw; - - for (i = 0; i < IPREASS_NHASH; i++) - ipq[i].next = ipq[i].prev = &ipq[i]; - - maxnipq = nmbclusters/4; - - ip_id = rtems_bsdnet_seconds_since_boot() & 0xffff; - ipintrq.ifq_maxlen = ipqmaxlen; -#ifdef IPFIREWALL - ip_fw_init(); -#endif -#ifdef IPNAT - ip_nat_init(); -#endif - -} - -static struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET }; -static struct route ipforward_rt; - -/* - * Ip input routine. Checksum and byte swap header. If fragmented - * try to reassemble. Process options. Pass to next level. - */ -void -ip_input(struct mbuf *m) -{ - struct ip *ip; - struct ipq *fp; - struct in_ifaddr *ia; - int i, hlen; - u_short sum; - -#ifdef DIAGNOSTIC - if ((m->m_flags & M_PKTHDR) == 0) - panic("ip_input no HDR"); -#endif - /* - * If no IP addresses have been set yet but the interfaces - * are receiving, can't do anything with incoming packets yet. - */ - if (in_ifaddr == NULL) - goto bad; - ipstat.ips_total++; - - if (m->m_pkthdr.len < sizeof(struct ip)) - goto tooshort; - -#if defined(DIAGNOSTIC) && defined(ORIGINAL_FREEBSD_CODE) - if (m->m_len < sizeof(struct ip)) - panic("ipintr mbuf too short"); -#endif - - if (m->m_len < sizeof (struct ip) && - (m = m_pullup(m, sizeof (struct ip))) == 0) { - ipstat.ips_toosmall++; - return; - } - ip = mtod(m, struct ip *); - - if (IP_VHL_V(ip->ip_vhl) != IPVERSION) { - ipstat.ips_badvers++; - goto bad; - } - - hlen = IP_VHL_HL(ip->ip_vhl) << 2; - if (hlen < sizeof(struct ip)) { /* minimum header length */ - ipstat.ips_badhlen++; - goto bad; - } - if (hlen > m->m_len) { - if ((m = m_pullup(m, hlen)) == 0) { - ipstat.ips_badhlen++; - return; - } - ip = mtod(m, struct ip *); - } - if (hlen == sizeof(struct ip)) { - sum = in_cksum_hdr(ip); - } else { - sum = in_cksum(m, hlen); - } - if (sum) { - ipstat.ips_badsum++; - goto bad; - } - - /* - * Convert fields to host representation. - */ - NTOHS(ip->ip_len); - if (ip->ip_len < hlen) { - ipstat.ips_badlen++; - goto bad; - } - NTOHS(ip->ip_id); - NTOHS(ip->ip_off); - - /* - * Check that the amount of data in the buffers - * is as at least much as the IP header would have us expect. - * Trim mbufs if longer than we expect. - * Drop packet if shorter than we expect. - */ - if (m->m_pkthdr.len < ip->ip_len) { -tooshort: - ipstat.ips_tooshort++; - goto bad; - } - if (m->m_pkthdr.len > ip->ip_len) { - if (m->m_len == m->m_pkthdr.len) { - m->m_len = ip->ip_len; - m->m_pkthdr.len = ip->ip_len; - } else - m_adj(m, ip->ip_len - m->m_pkthdr.len); - } - /* - * IpHack's section. - * Right now when no processing on packet has done - * and it is still fresh out of network we do our black - * deals with it. - * - Firewall: deny/allow/divert - * - Xlate: translate packet's addr/port (NAT). - * - Wrap: fake packet's addr/port <unimpl.> - * - Encapsulate: put it in another IP and send out. <unimp.> - */ - -#ifdef COMPAT_IPFW - if (ip_fw_chk_ptr) { -#ifdef IPDIVERT - u_short port; - - port = (*ip_fw_chk_ptr)(&ip, hlen, NULL, ip_divert_ignore, &m); - ip_divert_ignore = 0; - if (port) { /* Divert packet */ - frag_divert_port = port; - goto ours; - } -#else - /* If ipfw says divert, we have to just drop packet */ - if ((*ip_fw_chk_ptr)(&ip, hlen, NULL, 0, &m)) { - m_freem(m); - m = NULL; - } -#endif - if (!m) - return; - } - - if (ip_nat_ptr && !(*ip_nat_ptr)(&ip, &m, m->m_pkthdr.rcvif, IP_NAT_IN)) - return; -#endif - - /* - * Process options and, if not destined for us, - * ship it on. ip_dooptions returns 1 when an - * error was detected (causing an icmp message - * to be sent and the original packet to be freed). - */ - ip_nhops = 0; /* for source routed packets */ - if (hlen > sizeof (struct ip) && ip_dooptions(m)) - return; - - /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no - * matter if it is destined to another node, or whether it is - * a multicast one, RSVP wants it! and prevents it from being forwarded - * anywhere else. Also checks if the rsvp daemon is running before - * grabbing the packet. - */ - if (rsvp_on && ip->ip_p==IPPROTO_RSVP) - goto ours; - - /* - * Check our list of addresses, to see if the packet is for us. - */ - for (ia = in_ifaddr; ia; ia = ia->ia_next) { -#define satosin(sa) ((struct sockaddr_in *)(sa)) - - if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr) - goto ours; -#ifdef BOOTP_COMPAT - if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) - goto ours; -#endif - if (ia->ia_ifp && ia->ia_ifp->if_flags & IFF_BROADCAST) { - if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == - ip->ip_dst.s_addr) - goto ours; - if (ip->ip_dst.s_addr == ia->ia_netbroadcast.s_addr) - goto ours; - } - } - if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { - struct in_multi *inm; - if (ip_mrouter) { - /* - * If we are acting as a multicast router, all - * incoming multicast packets are passed to the - * kernel-level multicast forwarding function. - * The packet is returned (relatively) intact; if - * ip_mforward() returns a non-zero value, the packet - * must be discarded, else it may be accepted below. - * - * (The IP ident field is put in the same byte order - * as expected when ip_mforward() is called from - * ip_output().) - */ - ip->ip_id = htons(ip->ip_id); - if (ip_mforward(ip, m->m_pkthdr.rcvif, m, 0) != 0) { - ipstat.ips_cantforward++; - m_freem(m); - return; - } - ip->ip_id = ntohs(ip->ip_id); - - /* - * The process-level routing demon needs to receive - * all multicast IGMP packets, whether or not this - * host belongs to their destination groups. - */ - if (ip->ip_p == IPPROTO_IGMP) - goto ours; - ipstat.ips_forward++; - } - /* - * See if we belong to the destination multicast group on the - * arrival interface. - */ - IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm); - if (inm == NULL) { - ipstat.ips_cantforward++; - m_freem(m); - return; - } - goto ours; - } - if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST) - goto ours; - if (ip->ip_dst.s_addr == INADDR_ANY) - goto ours; - - /* - * Not for us; forward if possible and desirable. - */ - if (ipforwarding == 0) { - ipstat.ips_cantforward++; - m_freem(m); - } else - ip_forward(m, 0); - return; - -ours: - - /* - * If offset or IP_MF are set, must reassemble. - * Otherwise, nothing need be done. - * (We could look in the reassembly queue to see - * if the packet was previously fragmented, - * but it's not worth the time; just let them time out.) - */ - if (ip->ip_off &~ (IP_DF | IP_RF)) { - if (m->m_flags & M_EXT) { /* XXX */ - if ((m = m_pullup(m, sizeof (struct ip))) == 0) { - ipstat.ips_toosmall++; -#ifdef IPDIVERT - frag_divert_port = 0; -#endif - return; - } - ip = mtod(m, struct ip *); - } - sum = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id); - /* - * Look for queue of fragments - * of this datagram. - */ - for (fp = ipq[sum].next; fp != &ipq[sum]; fp = fp->next) - if (ip->ip_id == fp->ipq_id && - ip->ip_src.s_addr == fp->ipq_src.s_addr && - ip->ip_dst.s_addr == fp->ipq_dst.s_addr && - ip->ip_p == fp->ipq_p) - goto found; - - fp = 0; - - /* check if there's a place for the new queue */ - if (nipq > maxnipq) { - /* - * drop something from the tail of the current queue - * before proceeding further - */ - if (ipq[sum].prev == &ipq[sum]) { /* gak */ - for (i = 0; i < IPREASS_NHASH; i++) { - if (ipq[i].prev != &ipq[i]) { - ip_freef(ipq[i].prev); - break; - } - } - } else - ip_freef(ipq[sum].prev); - } -found: - /* - * Adjust ip_len to not reflect header, - * set ip_mff if more fragments are expected, - * convert offset of this to bytes. - */ - ip->ip_len -= hlen; - ((struct ipasfrag *)ip)->ipf_mff &= ~1; - if (ip->ip_off & IP_MF) - ((struct ipasfrag *)ip)->ipf_mff |= 1; - ip->ip_off <<= 3; - - /* - * If datagram marked as having more fragments - * or if this is not the first fragment, - * attempt reassembly; if it succeeds, proceed. - */ - if (((struct ipasfrag *)ip)->ipf_mff & 1 || ip->ip_off) { - ipstat.ips_fragments++; - ip = ip_reass((struct ipasfrag *)ip, fp, &ipq[sum]); - if (ip == 0) - return; - ipstat.ips_reassembled++; - m = dtom(ip); -#ifdef IPDIVERT - if (frag_divert_port) { - ip->ip_len += hlen; - HTONS(ip->ip_len); - HTONS(ip->ip_off); - HTONS(ip->ip_id); - ip->ip_sum = 0; - ip->ip_sum = in_cksum_hdr(ip); - NTOHS(ip->ip_id); - NTOHS(ip->ip_off); - NTOHS(ip->ip_len); - ip->ip_len -= hlen; - } -#endif - } else - if (fp) - ip_freef(fp); - } else - ip->ip_len -= hlen; - -#ifdef IPDIVERT - /* - * Divert reassembled packets to the divert protocol if required - */ - if (frag_divert_port) { - ipstat.ips_delivered++; - ip_divert_port = frag_divert_port; - frag_divert_port = 0; - (*inetsw[ip_protox[IPPROTO_DIVERT]].pr_input)(m, hlen); - return; - } - - /* Don't let packets divert themselves */ - if (ip->ip_p == IPPROTO_DIVERT) { - ipstat.ips_noproto++; - goto bad; - } -#endif - - /* - * Switch out to protocol's input routine. - */ - ipstat.ips_delivered++; - (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen); - return; -bad: - m_freem(m); -} - -/* - * IP software interrupt routine - to go away sometime soon - */ -void -ipintr(void) -{ - int s; - struct mbuf *m; - - while(1) { - s = splimp(); - IF_DEQUEUE(&ipintrq, m); - splx(s); - if (m == 0) - return; - ip_input(m); - } -} - -NETISR_SET(NETISR_IP, ipintr); - -/* - * Take incoming datagram fragment and try to - * reassemble it into whole datagram. If a chain for - * reassembly of this datagram already exists, then it - * is given as fp; otherwise have to make a chain. - */ -static struct ip * -ip_reass(ip, fp, where) - register struct ipasfrag *ip; - register struct ipq *fp; - struct ipq *where; -{ - register struct mbuf *m = dtom(ip); - register struct ipasfrag *q; - struct mbuf *t; - int hlen = ip->ip_hl << 2; - int i, next; - - /* - * Presence of header sizes in mbufs - * would confuse code below. - */ - m->m_data += hlen; - m->m_len -= hlen; - - /* - * If first fragment to arrive, create a reassembly queue. - */ - if (fp == 0) { - if ((t = m_get(M_DONTWAIT, MT_FTABLE)) == NULL) - goto dropfrag; - fp = mtod(t, struct ipq *); - insque(fp, where); - nipq++; - fp->ipq_ttl = IPFRAGTTL; - fp->ipq_p = ip->ip_p; - fp->ipq_id = ip->ip_id; - fp->ipq_next = fp->ipq_prev = (struct ipasfrag *)fp; - fp->ipq_src = ((struct ip *)ip)->ip_src; - fp->ipq_dst = ((struct ip *)ip)->ip_dst; -#ifdef IPDIVERT - fp->ipq_divert = 0; -#endif - q = (struct ipasfrag *)fp; - goto insert; - } - - /* - * Find a segment which begins after this one does. - */ - for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = q->ipf_next) - if (q->ip_off > ip->ip_off) - break; - - /* - * If there is a preceding segment, it may provide some of - * our data already. If so, drop the data from the incoming - * segment. If it provides all of our data, drop us. - */ - if (q->ipf_prev != (struct ipasfrag *)fp) { - i = q->ipf_prev->ip_off + q->ipf_prev->ip_len - ip->ip_off; - if (i > 0) { - if (i >= ip->ip_len) - goto dropfrag; - m_adj(dtom(ip), i); - ip->ip_off += i; - ip->ip_len -= i; - } - } - - /* - * While we overlap succeeding segments trim them or, - * if they are completely covered, dequeue them. - */ - while (q != (struct ipasfrag *)fp && ip->ip_off + ip->ip_len > q->ip_off) { - struct mbuf *m0; - - i = (ip->ip_off + ip->ip_len) - q->ip_off; - if (i < q->ip_len) { - q->ip_len -= i; - q->ip_off += i; - m_adj(dtom(q), i); - break; - } - m0 = dtom(q); - q = q->ipf_next; - ip_deq(q->ipf_prev); - m_freem(m0); - } - -insert: - -#ifdef IPDIVERT - /* - * Any fragment diverting causes the whole packet to divert - */ - if (frag_divert_port != 0) - fp->ipq_divert = frag_divert_port; - frag_divert_port = 0; -#endif - - /* - * Stick new segment in its place; - * check for complete reassembly. - */ - ip_enq(ip, q->ipf_prev); - next = 0; - for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = q->ipf_next) { - if (q->ip_off != next) - return (0); - next += q->ip_len; - } - if (q->ipf_prev->ipf_mff & 1) - return (0); - - /* - * Reassembly is complete. Make sure the packet is a sane size. - */ - if (next + (IP_VHL_HL(((struct ip *)fp->ipq_next)->ip_vhl) << 2) - > IP_MAXPACKET) { - ipstat.ips_toolong++; - ip_freef(fp); - return (0); - } - - /* - * Concatenate fragments. - */ - q = fp->ipq_next; - m = dtom(q); - t = m->m_next; - m->m_next = 0; - m_cat(m, t); - q = q->ipf_next; - while (q != (struct ipasfrag *)fp) { - t = dtom(q); - q = q->ipf_next; - m_cat(m, t); - } - -#ifdef IPDIVERT - /* - * Record divert port for packet, if any - */ - frag_divert_port = fp->ipq_divert; -#endif - - /* - * Create header for new ip packet by - * modifying header of first packet; - * dequeue and discard fragment reassembly header. - * Make header visible. - */ - ip = fp->ipq_next; - ip->ip_len = next; - ip->ipf_mff &= ~1; - ((struct ip *)ip)->ip_src = fp->ipq_src; - ((struct ip *)ip)->ip_dst = fp->ipq_dst; - remque(fp); - nipq--; - (void) m_free(dtom(fp)); - m = dtom(ip); - m->m_len += (ip->ip_hl << 2); - m->m_data -= (ip->ip_hl << 2); - /* some debugging cruft by sklower, below, will go away soon */ - if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */ - register int plen = 0; - for (t = m; m; m = m->m_next) - plen += m->m_len; - t->m_pkthdr.len = plen; - } - return ((struct ip *)ip); - -dropfrag: - ipstat.ips_fragdropped++; - m_freem(m); - return (0); -} - -/* - * Free a fragment reassembly header and all - * associated datagrams. - */ -static void -ip_freef(fp) - struct ipq *fp; -{ - register struct ipasfrag *q, *p; - - for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = p) { - p = q->ipf_next; - ip_deq(q); - m_freem(dtom(q)); - } - remque(fp); - (void) m_free(dtom(fp)); - nipq--; -} - -/* - * Put an ip fragment on a reassembly chain. - * Like insque, but pointers in middle of structure. - */ -static void -ip_enq(p, prev) - register struct ipasfrag *p, *prev; -{ - - p->ipf_prev = prev; - p->ipf_next = prev->ipf_next; - prev->ipf_next->ipf_prev = p; - prev->ipf_next = p; -} - -/* - * To ip_enq as remque is to insque. - */ -static void -ip_deq(p) - register struct ipasfrag *p; -{ - - p->ipf_prev->ipf_next = p->ipf_next; - p->ipf_next->ipf_prev = p->ipf_prev; -} - -/* - * IP timer processing; - * if a timer expires on a reassembly - * queue, discard it. - */ -void -ip_slowtimo() -{ - register struct ipq *fp; - int s = splnet(); - int i; - - for (i = 0; i < IPREASS_NHASH; i++) { - fp = ipq[i].next; - if (fp == 0) - continue; - while (fp != &ipq[i]) { - --fp->ipq_ttl; - fp = fp->next; - if (fp->prev->ipq_ttl == 0) { - ipstat.ips_fragtimeout++; - ip_freef(fp->prev); - } - } - } - splx(s); -} - -/* - * Drain off all datagram fragments. - */ -void -ip_drain() -{ - int i; - - for (i = 0; i < IPREASS_NHASH; i++) { - while (ipq[i].next != &ipq[i]) { - ipstat.ips_fragdropped++; - ip_freef(ipq[i].next); - } - } - in_rtqdrain(); -} - -/* - * Do option processing on a datagram, - * possibly discarding it if bad options are encountered, - * or forwarding it if source-routed. - * Returns 1 if packet has been forwarded/freed, - * 0 if the packet should be processed further. - */ -static int -ip_dooptions(m) - struct mbuf *m; -{ - register struct ip *ip = mtod(m, struct ip *); - register u_char *cp; - register struct ip_timestamp *ipt; - register struct in_ifaddr *ia; - int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; - struct in_addr *sin, dst; - n_time ntime; - - dst = ip->ip_dst; - cp = (u_char *)(ip + 1); - cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip); - for (; cnt > 0; cnt -= optlen, cp += optlen) { - opt = cp[IPOPT_OPTVAL]; - if (opt == IPOPT_EOL) - break; - if (opt == IPOPT_NOP) - optlen = 1; - else { - optlen = cp[IPOPT_OLEN]; - if (optlen <= 0 || optlen > cnt) { - code = &cp[IPOPT_OLEN] - (u_char *)ip; - goto bad; - } - } - switch (opt) { - - default: - break; - - /* - * Source routing with record. - * Find interface with current destination address. - * If none on this machine then drop if strictly routed, - * or do nothing if loosely routed. - * Record interface address and bring up next address - * component. If strictly routed make sure next - * address is on directly accessible net. - */ - case IPOPT_LSRR: - case IPOPT_SSRR: - if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { - code = &cp[IPOPT_OFFSET] - (u_char *)ip; - goto bad; - } - ipaddr.sin_addr = ip->ip_dst; - ia = (struct in_ifaddr *) - ifa_ifwithaddr((struct sockaddr *)&ipaddr); - if (ia == 0) { - if (opt == IPOPT_SSRR) { - type = ICMP_UNREACH; - code = ICMP_UNREACH_SRCFAIL; - goto bad; - } - if (!ip_dosourceroute) - goto nosourcerouting; - /* - * Loose routing, and not at next destination - * yet; nothing to do except forward. - */ - break; - } - off--; /* 0 origin */ - if (off > optlen - sizeof(struct in_addr)) { - /* - * End of source route. Should be for us. - */ - if (!ip_acceptsourceroute) - goto nosourcerouting; - save_rte(cp, ip->ip_src); - break; - } - - if (!ip_dosourceroute) { - char buf[4*sizeof "123"]; - -nosourcerouting: - strcpy(buf, inet_ntoa(ip->ip_dst)); - log(LOG_WARNING, - "attempted source route from %s to %s\n", - inet_ntoa(ip->ip_src), buf); - type = ICMP_UNREACH; - code = ICMP_UNREACH_SRCFAIL; - goto bad; - } - - /* - * locate outgoing interface - */ - (void)memcpy(&ipaddr.sin_addr, cp + off, - sizeof(ipaddr.sin_addr)); - - if (opt == IPOPT_SSRR) { -#define INA struct in_ifaddr * -#define SA struct sockaddr * - if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0) - ia = (INA)ifa_ifwithnet((SA)&ipaddr); - } else - ia = ip_rtaddr(ipaddr.sin_addr); - if (ia == 0) { - type = ICMP_UNREACH; - code = ICMP_UNREACH_SRCFAIL; - goto bad; - } - ip->ip_dst = ipaddr.sin_addr; - (void)memcpy(cp + off, &(IA_SIN(ia)->sin_addr), - sizeof(struct in_addr)); - cp[IPOPT_OFFSET] += sizeof(struct in_addr); - /* - * Let ip_intr's mcast routing check handle mcast pkts - */ - forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr)); - break; - - case IPOPT_RR: - if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { - code = &cp[IPOPT_OFFSET] - (u_char *)ip; - goto bad; - } - /* - * If no space remains, ignore. - */ - off--; /* 0 origin */ - if (off > optlen - sizeof(struct in_addr)) - break; - (void)memcpy(&ipaddr.sin_addr, &ip->ip_dst, - sizeof(ipaddr.sin_addr)); - /* - * locate outgoing interface; if we're the destination, - * use the incoming interface (should be same). - */ - if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 && - (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) { - type = ICMP_UNREACH; - code = ICMP_UNREACH_HOST; - goto bad; - } - (void)memcpy(cp + off, &(IA_SIN(ia)->sin_addr), - sizeof(struct in_addr)); - cp[IPOPT_OFFSET] += sizeof(struct in_addr); - break; - - case IPOPT_TS: - code = cp - (u_char *)ip; - ipt = (struct ip_timestamp *)cp; - if (ipt->ipt_len < 5) - goto bad; - if (ipt->ipt_ptr > ipt->ipt_len - sizeof (long)) { - if (++ipt->ipt_oflw == 0) - goto bad; - break; - } - sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1); - switch (ipt->ipt_flg) { - - case IPOPT_TS_TSONLY: - break; - - case IPOPT_TS_TSANDADDR: - if (ipt->ipt_ptr + sizeof(n_time) + - sizeof(struct in_addr) > ipt->ipt_len) - goto bad; - ipaddr.sin_addr = dst; - ia = (INA)ifaof_ifpforaddr((SA)&ipaddr, - m->m_pkthdr.rcvif); - if (ia == 0) - continue; - (void)memcpy(sin, &IA_SIN(ia)->sin_addr, - sizeof(struct in_addr)); - ipt->ipt_ptr += sizeof(struct in_addr); - break; - - case IPOPT_TS_PRESPEC: - if (ipt->ipt_ptr + sizeof(n_time) + - sizeof(struct in_addr) > ipt->ipt_len) - goto bad; - (void)memcpy(&ipaddr.sin_addr, sin, - sizeof(struct in_addr)); - if (ifa_ifwithaddr((SA)&ipaddr) == 0) - continue; - ipt->ipt_ptr += sizeof(struct in_addr); - break; - - default: - goto bad; - } - ntime = iptime(); - (void)memcpy(cp + ipt->ipt_ptr - 1, &ntime, - sizeof(n_time)); - ipt->ipt_ptr += sizeof(n_time); - } - } - if (forward && ipforwarding) { - ip_forward(m, 1); - return (1); - } - return (0); -bad: - ip->ip_len -= IP_VHL_HL(ip->ip_vhl) << 2; /* XXX icmp_error adds in hdr length */ - icmp_error(m, type, code, 0, 0); - ipstat.ips_badoptions++; - return (1); -} - -/* - * Given address of next destination (final or next hop), - * return internet address info of interface to be used to get there. - */ -static struct in_ifaddr * -ip_rtaddr(dst) - struct in_addr dst; -{ - register struct sockaddr_in *sin; - - sin = (struct sockaddr_in *) &ipforward_rt.ro_dst; - - if (ipforward_rt.ro_rt == 0 || dst.s_addr != sin->sin_addr.s_addr) { - if (ipforward_rt.ro_rt) { - RTFREE(ipforward_rt.ro_rt); - ipforward_rt.ro_rt = 0; - } - sin->sin_family = AF_INET; - sin->sin_len = sizeof(*sin); - sin->sin_addr = dst; - - rtalloc_ign(&ipforward_rt, RTF_PRCLONING); - } - if (ipforward_rt.ro_rt == 0) - return ((struct in_ifaddr *)0); - return ((struct in_ifaddr *) ipforward_rt.ro_rt->rt_ifa); -} - -/* - * Save incoming source route for use in replies, - * to be picked up later by ip_srcroute if the receiver is interested. - */ -void -save_rte(option, dst) - u_char *option; - struct in_addr dst; -{ - unsigned olen; - - olen = option[IPOPT_OLEN]; -#ifdef DIAGNOSTIC - if (ipprintfs) - printf("save_rte: olen %d\n", olen); -#endif - if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) - return; - bcopy(option, ip_srcrt.srcopt, olen); - ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); - ip_srcrt.dst = dst; -} - -/* - * Retrieve incoming source route for use in replies, - * in the same form used by setsockopt. - * The first hop is placed before the options, will be removed later. - */ -struct mbuf * -ip_srcroute() -{ - register struct in_addr *p, *q; - register struct mbuf *m; - - if (ip_nhops == 0) - return ((struct mbuf *)0); - m = m_get(M_DONTWAIT, MT_SOOPTS); - if (m == 0) - return ((struct mbuf *)0); - -#define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) - - /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ - m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + - OPTSIZ; -#ifdef DIAGNOSTIC - if (ipprintfs) - printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len); -#endif - - /* - * First save first hop for return route - */ - p = &ip_srcrt.route[ip_nhops - 1]; - *(mtod(m, struct in_addr *)) = *p--; -#ifdef DIAGNOSTIC - if (ipprintfs) - printf(" hops %lx", ntohl(mtod(m, struct in_addr *)->s_addr)); -#endif - - /* - * Copy option fields and padding (nop) to mbuf. - */ - ip_srcrt.nop = IPOPT_NOP; - ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; - (void)memcpy(mtod(m, caddr_t) + sizeof(struct in_addr), - &ip_srcrt.nop, OPTSIZ); - q = (struct in_addr *)(mtod(m, caddr_t) + - sizeof(struct in_addr) + OPTSIZ); -#undef OPTSIZ - /* - * Record return path as an IP source route, - * reversing the path (pointers are now aligned). - */ - while (p >= ip_srcrt.route) { -#ifdef DIAGNOSTIC - if (ipprintfs) - printf(" %lx", ntohl(q->s_addr)); -#endif - *q++ = *p--; - } - /* - * Last hop goes to final destination. - */ - *q = ip_srcrt.dst; -#ifdef DIAGNOSTIC - if (ipprintfs) - printf(" %lx\n", ntohl(q->s_addr)); -#endif - return (m); -} - -/* - * Strip out IP options, at higher - * level protocol in the kernel. - * Second argument is buffer to which options - * will be moved, and return value is their length. - * XXX should be deleted; last arg currently ignored. - */ -void -ip_stripoptions(m, mopt) - register struct mbuf *m; - struct mbuf *mopt; -{ - register int i; - struct ip *ip = mtod(m, struct ip *); - register caddr_t opts; - int olen; - - olen = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip); - opts = (caddr_t)(ip + 1); - i = m->m_len - (sizeof (struct ip) + olen); - bcopy(opts + olen, opts, (unsigned)i); - m->m_len -= olen; - if (m->m_flags & M_PKTHDR) - m->m_pkthdr.len -= olen; - ip->ip_vhl = IP_MAKE_VHL(IPVERSION, sizeof(struct ip) >> 2); -} - -u_char inetctlerrmap[PRC_NCMDS] = { - 0, 0, 0, 0, - 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, - EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, - EMSGSIZE, EHOSTUNREACH, 0, 0, - 0, 0, 0, 0, - ENOPROTOOPT -}; - -/* - * Forward a packet. If some error occurs return the sender - * an icmp packet. Note we can't always generate a meaningful - * icmp message because icmp doesn't have a large enough repertoire - * of codes and types. - * - * If not forwarding, just drop the packet. This could be confusing - * if ipforwarding was zero but some routing protocol was advancing - * us as a gateway to somewhere. However, we must let the routing - * protocol deal with that. - * - * The srcrt parameter indicates whether the packet is being forwarded - * via a source route. - */ -static void -ip_forward(m, srcrt) - struct mbuf *m; - int srcrt; -{ - register struct ip *ip = mtod(m, struct ip *); - register struct sockaddr_in *sin; - register struct rtentry *rt; - int error, type = 0, code = 0; - struct mbuf *mcopy; - n_long dest; - struct ifnet *destifp; - - dest = 0; -#ifdef DIAGNOSTIC - if (ipprintfs) - printf("forward: src %lx dst %lx ttl %x\n", - ip->ip_src.s_addr, ip->ip_dst.s_addr, ip->ip_ttl); -#endif - - - if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) { - ipstat.ips_cantforward++; - m_freem(m); - return; - } - HTONS(ip->ip_id); - if (ip->ip_ttl <= IPTTLDEC) { - icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); - return; - } - ip->ip_ttl -= IPTTLDEC; - - sin = (struct sockaddr_in *)&ipforward_rt.ro_dst; - if ((rt = ipforward_rt.ro_rt) == 0 || - ip->ip_dst.s_addr != sin->sin_addr.s_addr) { - if (ipforward_rt.ro_rt) { - RTFREE(ipforward_rt.ro_rt); - ipforward_rt.ro_rt = 0; - } - sin->sin_family = AF_INET; - sin->sin_len = sizeof(*sin); - sin->sin_addr = ip->ip_dst; - - rtalloc_ign(&ipforward_rt, RTF_PRCLONING); - if (ipforward_rt.ro_rt == 0) { - icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0); - return; - } - rt = ipforward_rt.ro_rt; - } - - /* - * Save at most 64 bytes of the packet in case - * we need to generate an ICMP message to the src. - */ - mcopy = m_copy(m, 0, imin((int)ip->ip_len, 64)); - - /* - * If forwarding packet using same interface that it came in on, - * perhaps should send a redirect to sender to shortcut a hop. - * Only send redirect if source is sending directly to us, - * and if packet was not source routed (or has any options). - * Also, don't send redirect if forwarding using a default route - * or a route modified by a redirect. - */ -#define satosin(sa) ((struct sockaddr_in *)(sa)) - if (rt->rt_ifp == m->m_pkthdr.rcvif && - (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && - satosin(rt_key(rt))->sin_addr.s_addr != 0 && - ipsendredirects && !srcrt) { -#define RTA(rt) ((struct in_ifaddr *)(rt->rt_ifa)) - u_long src = ntohl(ip->ip_src.s_addr); - - if (RTA(rt) && - (src & RTA(rt)->ia_subnetmask) == RTA(rt)->ia_subnet) { - if (rt->rt_flags & RTF_GATEWAY) - dest = satosin(rt->rt_gateway)->sin_addr.s_addr; - else - dest = ip->ip_dst.s_addr; - /* Router requirements says to only send host redirects */ - type = ICMP_REDIRECT; - code = ICMP_REDIRECT_HOST; -#ifdef DIAGNOSTIC - if (ipprintfs) - printf("redirect (%d) to %lx\n", code, (u_long)dest); -#endif - } - } - - error = ip_output(m, (struct mbuf *)0, &ipforward_rt, - IP_FORWARDING, 0); - if (error) - ipstat.ips_cantforward++; - else { - ipstat.ips_forward++; - if (type) - ipstat.ips_redirectsent++; - else { - if (mcopy) - m_freem(mcopy); - return; - } - } - if (mcopy == NULL) - return; - destifp = NULL; - - switch (error) { - - case 0: /* forwarded, but need redirect */ - /* type, code set above */ - break; - - case ENETUNREACH: /* shouldn't happen, checked above */ - case EHOSTUNREACH: - case ENETDOWN: - case EHOSTDOWN: - default: - type = ICMP_UNREACH; - code = ICMP_UNREACH_HOST; - break; - - case EMSGSIZE: - type = ICMP_UNREACH; - code = ICMP_UNREACH_NEEDFRAG; - if (ipforward_rt.ro_rt) - destifp = ipforward_rt.ro_rt->rt_ifp; - ipstat.ips_cantfrag++; - break; - - case ENOBUFS: - type = ICMP_SOURCEQUENCH; - code = 0; - break; - } - icmp_error(mcopy, type, code, dest, destifp); -} - -void -ip_savecontrol(inp, mp, ip, m) - register struct inpcb *inp; - register struct mbuf **mp; - register struct ip *ip; - register struct mbuf *m; -{ - if (inp->inp_socket->so_options & SO_TIMESTAMP) { - struct timeval tv; - - microtime(&tv); - *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), - SCM_TIMESTAMP, SOL_SOCKET); - if (*mp) - mp = &(*mp)->m_next; - } - if (inp->inp_flags & INP_RECVDSTADDR) { - *mp = sbcreatecontrol((caddr_t) &ip->ip_dst, - sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); - if (*mp) - mp = &(*mp)->m_next; - } -#ifdef notyet - /* XXX - * Moving these out of udp_input() made them even more broken - * than they already were. - */ - /* options were tossed already */ - if (inp->inp_flags & INP_RECVOPTS) { - *mp = sbcreatecontrol((caddr_t) opts_deleted_above, - sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); - if (*mp) - mp = &(*mp)->m_next; - } - /* ip_srcroute doesn't do what we want here, need to fix */ - if (inp->inp_flags & INP_RECVRETOPTS) { - *mp = sbcreatecontrol((caddr_t) ip_srcroute(), - sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); - if (*mp) - mp = &(*mp)->m_next; - } -#endif - if (inp->inp_flags & INP_RECVIF) { - struct sockaddr_dl sdl; - - sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]); - sdl.sdl_family = AF_LINK; - sdl.sdl_index = m->m_pkthdr.rcvif ? - m->m_pkthdr.rcvif->if_index : 0; - sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0; - *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len, - IP_RECVIF, IPPROTO_IP); - if (*mp) - mp = &(*mp)->m_next; - } -} - -int -ip_rsvp_init(struct socket *so) -{ - if (so->so_type != SOCK_RAW || - so->so_proto->pr_protocol != IPPROTO_RSVP) - return EOPNOTSUPP; - - if (ip_rsvpd != NULL) - return EADDRINUSE; - - ip_rsvpd = so; - /* - * This may seem silly, but we need to be sure we don't over-increment - * the RSVP counter, in case something slips up. - */ - if (!ip_rsvp_on) { - ip_rsvp_on = 1; - rsvp_on++; - } - - return 0; -} - -int -ip_rsvp_done(void) -{ - ip_rsvpd = NULL; - /* - * This may seem silly, but we need to be sure we don't over-decrement - * the RSVP counter, in case something slips up. - */ - if (ip_rsvp_on) { - ip_rsvp_on = 0; - rsvp_on--; - } - return 0; -} |