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-rw-r--r--ip_fil_irix.c1369
1 files changed, 1369 insertions, 0 deletions
diff --git a/ip_fil_irix.c b/ip_fil_irix.c
new file mode 100644
index 0000000000000..2237fc3b81cab
--- /dev/null
+++ b/ip_fil_irix.c
@@ -0,0 +1,1369 @@
+/*
+ * Copyright (C) 2012 by Darren Reed.
+ *
+ * See the IPFILTER.LICENCE file for details on licencing.
+ */
+#if !defined(lint)
+static const char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-2000 Darren Reed";
+static const char rcsid[] = "@(#)$Id$";
+#endif
+
+#if defined(KERNEL) || defined(_KERNEL)
+# undef KERNEL
+# undef _KERNEL
+# define KERNEL 1
+# define _KERNEL 1
+#endif
+#include <sys/param.h>
+#include <sys/errno.h>
+#include <sys/types.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <sys/systm.h>
+#include <sys/dir.h>
+#include <sys/mbuf.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+
+#include <net/if.h>
+#include <net/if.h>
+#include <sys/debug.h>
+#ifdef IFF_DRVRLOCK /* IRIX6 */
+# include <sys/hashing.h>
+#endif
+#include <net/route.h>
+#include <netinet/in.h>
+#if !defined(IFF_DRVRLOCK) /* IRIX < 6 */
+# include <netinet/in_var.h>
+#endif
+#include <netinet/in_systm.h>
+#include <netinet/in_var.h>
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+#include <netinet/tcp.h>
+#include <netinet/tcp_timer.h>
+#include <netinet/udp.h>
+#include <netinet/tcpip.h>
+#include <netinet/ip_icmp.h>
+#include "netinet/ip_compat.h"
+#ifdef USE_INET6
+# include <netinet/icmp6.h>
+#endif
+#include "netinet/ip_fil.h"
+#include "netinet/ip_nat.h"
+#include "netinet/ip_frag.h"
+#include "netinet/ip_state.h"
+#include "netinet/ip_proxy.h"
+#include "netinet/ip_auth.h"
+#include "netinet/ip_sync.h"
+#include "netinet/ip_lookup.h"
+#include "netinet/ip_dstlist.h"
+#ifdef IPFILTER_SCAN
+#include "netinet/ip_scan.h"
+#endif
+
+#include "md5.h"
+
+extern int tcp_mtudisc;
+extern int ipforwarding;
+extern struct protosw inetsw[];
+extern int tcp_ttl;
+#if IRIX >= 60500
+extern toid_t ipf_timer_id;
+#endif
+
+static u_short ipid = 0;
+static int (*ipf_savep) __P((ip_t *, int, void *, int, struct mbuf **));
+static int ipf_send_ip __P((fr_info_t *, struct mbuf *));
+static int ipfopen __P((dev_t *, int, int, cred_t *));
+static int ipfclose __P((dev_t *, int, int, cred_t *));
+static int ipfread __P((dev_t, struct uio *, cred_t *));
+
+
+int
+ipf_attach()
+{
+ int error = 0, s;
+
+ SPL_NET(s);
+ if (ipf_running > 0) {
+ SPL_X(s);
+ return EBUSY;
+ }
+
+ if (ipf_initialise() < 0)
+ return -1;
+
+ error = ipf_ipfilter_attach();
+ if (error) {
+ ipf_deinitialise();
+ SPL_X(s);
+ return error;
+ }
+
+ if (ipf_checkp != ipf_check) {
+ ipf_savep = ipf_checkp;
+ ipf_checkp = ipf_check;
+ }
+
+ if (ipf_control_forwarding & 1)
+ ipforwarding = 1;
+
+ ipid = 0;
+
+ SPL_X(s);
+
+#if IRIX >= 60500
+ ipf_timer_id = timeout(ipf_slowtimer, &ipfmain, hz/2);
+#else
+ timeout(ipf_slowtimer, &ipfmain, hz/2);
+#endif
+ return 0;
+}
+
+
+/*
+ * Disable the filter by removing the hooks from the IP input/output
+ * stream.
+ */
+int
+ipf_detach()
+{
+ int s, error = 0;
+
+ SPL_NET(s);
+
+#if IRIX >= 60500
+ if (ipf_timer_id != 0) {
+ /* error = untimeout(ipf_timer_id); XXX - does not work with */
+ /* timeout() return value, only itimeout() and dtimeout(). */
+ ipf_timer_id = 0;
+ }
+#else
+ untimeout(ipf_slowtimer);
+#endif
+
+ if (ipf_control_forwarding & 2)
+ ipforwarding = 0;
+
+ ipf_deinitialise();
+
+ if (ipf_savep != NULL)
+ ipf_checkp = ipf_savep;
+ ipf_savep = NULL;
+ (void) frflush(&ipfmain, IPL_LOGIPF, FR_INQUE|FR_OUTQUE|FR_INACTIVE);
+ (void) frflush(&ipfmain, IPL_LOGIPF, FR_INQUE|FR_OUTQUE);
+
+ ipf_ipfilter_detach();
+
+ SPL_X(s);
+ return 0;
+}
+
+
+/*
+ * Filter ioctl interface.
+ */
+int
+ipfioctl(dev, cmd, data, mode, cp, rp)
+ dev_t dev;
+ int cmd;
+ caddr_t data;
+ int mode;
+ cred_t *cp;
+ int *rp;
+{
+ int error = 0, unit = 0;
+ SPL_INT(s);
+
+ unit = GET_MINOR(dev);
+ if ((IPL_LOGMAX < unit) || (unit < 0)) {
+ ipfmain.ipf_interror = 130002;
+ return ENXIO;
+ }
+
+ if (ipf_running <= 0) {
+ if (unit != IPL_LOGIPF && cmd != SIOCIPFINTERROR) {
+ ipfmain.ipf_interror = 130003;
+ return EIO;
+ }
+ if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET &&
+ cmd != SIOCIPFSET && cmd != SIOCFRENB &&
+ cmd != SIOCGETFS && cmd != SIOCGETFF &&
+ cmd != SIOCIPFINTERROR) {
+ ipfmain.ipf_interror = 130004;
+ return EIO;
+ }
+ }
+
+ SPL_NET(s);
+
+ error = ipf_ioctlswitch(&ipfmain, unit, data, cmd, mode,
+ cp->cr_uid, curproc);
+ if (error != -1) {
+ SPL_X(s);
+ return error;
+ }
+ error = 0;
+
+ SPL_X(s);
+ return error;
+}
+
+
+/*
+ * routines below for saving IP headers to buffer
+ */
+static int
+ipfopen(pdev, flags, devtype, cp)
+ dev_t *pdev;
+ int flags, devtype;
+ cred_t *cp;
+{
+ u_int unit = geteminor(*pdev);
+ int error;
+
+ if (IPL_LOGMAX < unit) {
+ error = ENXIO;
+ } else {
+ switch (unit)
+ {
+ case IPL_LOGIPF :
+ case IPL_LOGNAT :
+ case IPL_LOGSTATE :
+ case IPL_LOGAUTH :
+ case IPL_LOGLOOKUP :
+ case IPL_LOGSYNC :
+#ifdef IPFILTER_SCAN
+ case IPL_LOGSCAN :
+#endif
+ error = 0;
+ break;
+ default :
+ error = ENXIO;
+ break;
+ }
+ }
+ return error;
+}
+
+
+static int
+ipfclose(dev, flags, devtype, cp)
+ dev_t dev;
+ int flags, devtype;
+ cred_t *cp;
+{
+ u_int unit = GET_MINOR(dev);
+
+ if (IPL_LOGMAX < unit)
+ unit = ENXIO;
+ else
+ unit = 0;
+ return unit;
+}
+
+/*
+ * ipfread/ipflog
+ * both of these must operate with at least splnet() lest they be
+ * called during packet processing and cause an inconsistancy to appear in
+ * the filter lists.
+ */
+static int
+ipfread(dev, uio, crp)
+ dev_t dev;
+ register struct uio *uio;
+ cred_t *crp;
+{
+ if (ipf_running < 1) {
+ ipfmain.ipf_interror = 130006;
+ return EIO;
+ }
+
+#ifdef IPFILTER_LOG
+ return ipflog_read(GET_MINOR(dev), uio);
+#else
+ ipfmain.ipf_interror = 130007;
+ return ENXIO;
+#endif
+}
+
+
+/*
+ * ipf_send_reset - this could conceivably be a call to tcp_respond(), but that
+ * requires a large amount of setting up and isn't any more efficient.
+ */
+int
+ipf_send_reset(fin)
+ fr_info_t *fin;
+{
+ struct tcphdr *tcp, *tcp2;
+ int tlen = 0, hlen;
+ struct mbuf *m;
+#ifdef USE_INET6
+ ip6_t *ip6;
+#endif
+ ip_t *ip;
+
+ tcp = fin->fin_dp;
+ if (tcp->th_flags & TH_RST)
+ return -1; /* feedback loop */
+
+ if (ipf_checkl4sum(fin) == -1)
+ return -1;
+
+ m = m_get(M_DONTWAIT, MT_HEADER);
+ if (m == NULL)
+ return -1;
+
+ tlen = fin->fin_dlen - (TCP_OFF(tcp) << 2) +
+ ((tcp->th_flags & TH_SYN) ? 1 : 0) +
+ ((tcp->th_flags & TH_FIN) ? 1 : 0);
+
+#ifdef USE_INET6
+ hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t);
+#else
+ hlen = sizeof(ip_t);
+#endif
+ m->m_len = sizeof(*tcp2) + hlen;
+# if (BSD >= 199103)
+ m->m_data += max_linkhdr;
+ m->m_pkthdr.len = m->m_len;
+ m->m_pkthdr.rcvif = (struct ifnet *)0;
+# endif
+ ip = mtod(m, struct ip *);
+ bzero((char *)ip, hlen);
+# ifdef USE_INET6
+ ip6 = (ip6_t *)ip;
+# endif
+ tcp2 = (struct tcphdr *)((char *)ip + hlen);
+ tcp2->th_sport = tcp->th_dport;
+ tcp2->th_dport = tcp->th_sport;
+
+ if (tcp->th_flags & TH_ACK) {
+ tcp2->th_seq = tcp->th_ack;
+ tcp2->th_flags = TH_RST;
+ tcp2->th_ack = 0;
+ } else {
+ tcp2->th_seq = 0;
+ tcp2->th_ack = ntohl(tcp->th_seq);
+ tcp2->th_ack += tlen;
+ tcp2->th_ack = htonl(tcp2->th_ack);
+ tcp2->th_flags = TH_RST|TH_ACK;
+ }
+ TCP_X2_A(tcp2, 0);
+ TCP_OFF_A(tcp2, sizeof(*tcp2) >> 2);
+ tcp2->th_win = tcp->th_win;
+ tcp->th_sum = 0;
+ tcp->th_urp = 0;
+
+# ifdef USE_INET6
+ if (fin->fin_v == 6) {
+ ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow;
+ ip6->ip6_plen = htons(sizeof(struct tcphdr));
+ ip6->ip6_nxt = IPPROTO_TCP;
+ ip6->ip6_hlim = 0;
+ ip6->ip6_src = fin->fin_dst6;
+ ip6->ip6_dst = fin->fin_src6;
+ tcp2->th_sum = in6_cksum(m, IPPROTO_TCP,
+ sizeof(*ip6), sizeof(*tcp2));
+ return ipf_send_ip(fin, m);
+ }
+# endif
+ ip->ip_p = IPPROTO_TCP;
+ ip->ip_len = htons(sizeof(struct tcphdr));
+ ip->ip_src.s_addr = fin->fin_daddr;
+ ip->ip_dst.s_addr = fin->fin_saddr;
+ tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2));
+ ip->ip_len = hlen + sizeof(*tcp2);
+ return ipf_send_ip(fin, m);
+}
+
+
+static int
+ipf_send_ip(fin, m)
+ fr_info_t *fin;
+ struct mbuf *m;
+{
+ fr_info_t fnew;
+ ip_t *oip;
+ ip_t *ip;
+ int hlen;
+
+ ip = mtod(m, ip_t *);
+ bzero((char *)&fnew, sizeof(fnew));
+ fnew.fin_main_soft = fin->fin_main_soft;
+
+ IP_V_A(ip, fin->fin_v);
+ switch (fin->fin_v)
+ {
+ case 4 :
+ oip = fin->fin_ip;
+ hlen = sizeof(*oip);
+ fnew.fin_v = 4;
+ fnew.fin_p = ip->ip_p;
+ fnew.fin_plen = ip->ip_len;
+ IP_HL_A(ip, sizeof(*oip) >> 2);
+ ip->ip_tos = oip->ip_tos;
+ ip->ip_id = fin->fin_ip->ip_id;
+ if (ip->ip_p == IPPROTO_TCP && tcp_mtudisc != 0)
+ ip->ip_off = htons(IP_DF);
+ ip->ip_ttl = tcp_ttl;
+ ip->ip_sum = 0;
+ ip->ip_len = htons(ip->ip_len);
+ break;
+#ifdef USE_INET6
+ case 6 :
+ {
+ ip6_t *ip6 = (ip6_t *)ip;
+
+ ip6->ip6_hlim = 127;
+ m = *mpp;
+
+ return ip6_output(m, NULL, NULL, 0, NULL, NULL);
+ }
+#endif
+ default :
+ return EINVAL;
+ }
+#ifdef IPSEC
+ m->m_pkthdr.rcvif = NULL;
+#endif
+
+ fnew.fin_ifp = fin->fin_ifp;
+ fnew.fin_flx = FI_NOCKSUM;
+ fnew.fin_m = m;
+ fnew.fin_ip = ip;
+ fnew.fin_mp = &m;
+ fnew.fin_hlen = hlen;
+ fnew.fin_dp = (char *)ip + hlen;
+ (void) ipf_makefrip(hlen, ip, &fnew);
+
+ return ipf_fastroute(m, &m, &fnew, NULL);
+}
+
+
+int
+ipf_send_icmp_err(type, fin, dst)
+ int type;
+ fr_info_t *fin;
+ int dst;
+{
+ int err, hlen = 0, xtra = 0, iclen, ohlen = 0, avail;
+ struct in_addr dst4;
+ struct icmp *icmp;
+ struct mbuf *m;
+ i6addr_t dst6;
+ void *ifp;
+#ifdef USE_INET6
+ ip6_t *ip6, *ip62;
+ int code;
+#endif
+ ip_t *ip, *ip2;
+
+ if ((type < 0) || (type > ICMP_MAXTYPE))
+ return -1;
+
+#ifdef USE_INET6
+ code = fin->fin_icode;
+ if ((code < 0) || (code > sizeof(icmptoicmp6unreach)/sizeof(int)))
+ return -1;
+#endif
+
+ if (ipf_checkl4sum(fin) == -1)
+ return -1;
+
+ avail = 0;
+ ifp = fin->fin_ifp;
+ if (fin->fin_v == 4) {
+ if ((fin->fin_p == IPPROTO_ICMP) && !(fin->fin_flx & FI_SHORT))
+ switch (ntohs(fin->fin_data[0]) >> 8)
+ {
+ case ICMP_ECHO :
+ case ICMP_TSTAMP :
+ case ICMP_IREQ :
+ case ICMP_MASKREQ :
+ break;
+ default :
+ return 0;
+ }
+
+ avail = MLEN;
+ m = m_get(M_DONTWAIT, MT_HEADER);
+ if (m == NULL)
+ return -1;
+
+ if (dst == 0) {
+ if (ipf_ifpaddr(softc, 4, FRI_NORMAL, ifp,
+ &dst6, NULL) == -1) {
+ FREE_MB_T(m);
+ return -1;
+ }
+ dst4 = dst6.in4;
+ } else
+ dst4.s_addr = fin->fin_daddr;
+
+ hlen = sizeof(ip_t);
+ if (fin->fin_hlen < fin->fin_plen)
+ xtra = MIN(fin->fin_dlen, 8);
+ else
+ xtra = 0;
+ }
+
+#ifdef USE_INET6
+ else if (fin->fin_v == 6) {
+ hlen = sizeof(ip6_t);
+ ohlen = sizeof(ip6_t);
+ type = icmptoicmp6types[type];
+ if (type == ICMP6_DST_UNREACH)
+ code = icmptoicmp6unreach[code];
+
+ MGETHDR(m, M_DONTWAIT, MT_HEADER);
+ if (m == NULL)
+ return -1;
+
+ MCLGET(m, M_DONTWAIT);
+ if (m == NULL)
+ return -1;
+ avail = (m->m_flags & M_EXT) ? MCLBYTES : MHLEN;
+ xtra = MIN(fin->fin_plen,
+ avail - hlen - sizeof(*icmp) - max_linkhdr);
+ if (dst == 0) {
+ if (ipf_ifpaddr(softc, 6, FRI_NORMAL, ifp,
+ &dst6, NULL) == -1) {
+ FREE_MB_T(m);
+ return -1;
+ }
+ } else
+ dst6 = fin->fin_dst6;
+ }
+#endif
+ else {
+ FREE_MB_T(m);
+ return -1;
+ }
+
+ iclen = hlen + sizeof(*icmp);
+# if (BSD >= 199103)
+ avail -= (max_linkhdr + iclen);
+ if (avail < 0) {
+ FREE_MB_T(m);
+ return -1;
+ }
+ m->m_data += max_linkhdr;
+ m->m_pkthdr.rcvif = (struct ifnet *)0;
+ iclen += xtra;
+ m->m_pkthdr.len = iclen;
+#else
+ avail -= (m->m_off + iclen);
+ if (avail < 0) {
+ FREE_MB_T(m);
+ return -1;
+ }
+ iclen += xtra;
+#endif
+ m->m_len = iclen;
+ ip = mtod(m, ip_t *);
+ icmp = (struct icmp *)((char *)ip + hlen);
+ ip2 = (ip_t *)&icmp->icmp_ip;
+
+ icmp->icmp_type = type;
+ icmp->icmp_code = fin->fin_icode;
+ icmp->icmp_cksum = 0;
+#ifdef icmp_nextmtu
+ if (type == ICMP_UNREACH && fin->fin_icode == ICMP_UNREACH_NEEDFRAG) {
+ if (fin->fin_mtu != 0) {
+ icmp->icmp_nextmtu = htons(fin->fin_mtu);
+
+ } else if (ifp != NULL) {
+ icmp->icmp_nextmtu = htons(GETIFMTU_4(ifp));
+
+ } else { /* make up a number... */
+ icmp->icmp_nextmtu = htons(fin->fin_plen - 20);
+ }
+ }
+#endif
+
+ bcopy((char *)fin->fin_ip, (char *)ip2, ohlen);
+
+#ifdef USE_INET6
+ ip6 = (ip6_t *)ip;
+ if (fin->fin_v == 6) {
+ ip62 = (ip6_t *)ip2;
+
+ ip62->ip6_plen = htons(ip62->ip6_plen);
+ ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow;
+ ip6->ip6_plen = htons(iclen - hlen);
+ ip6->ip6_nxt = IPPROTO_ICMPV6;
+ ip6->ip6_hlim = 0;
+ ip6->ip6_src = dst6;
+ ip6->ip6_dst = fin->fin_src6;
+ if (xtra > 0)
+ bcopy((char *)fin->fin_ip + fin->fin_hlen,
+ (char *)&icmp->icmp_ip + fin->fin_hlen, xtra);
+ icmp->icmp_cksum = in6_cksum(m, IPPROTO_ICMPV6,
+ sizeof(*ip6), iclen - hlen);
+ } else
+#endif
+ {
+ ip->ip_p = IPPROTO_ICMP;
+ ip->ip_src.s_addr = dst4.s_addr;
+ ip->ip_dst.s_addr = fin->fin_saddr;
+
+ if (xtra > 0)
+ bcopy((char *)fin->fin_ip + fin->fin_hlen,
+ (char *)&icmp->icmp_ip + fin->fin_hlen, xtra);
+ icmp->icmp_cksum = ipf_cksum((u_short *)icmp,
+ sizeof(*icmp) + 8);
+ ip->ip_len = iclen;
+ ip->ip_p = IPPROTO_ICMP;
+ }
+ err = ipf_send_ip(fin, m);
+ return err;
+}
+
+
+void
+ipfinit(void)
+{
+ int i;
+
+ for (i = 0; i < 256; i++)
+ if (cdevsw[i].d_open == ipfopen) {
+ printf("ipfinit:ipfilter @%d\n", i); break;
+ }
+ if (i == 256)
+ printf("ipfinit:ipfilter not found\n");
+
+ if (ipf_attach() != 0)
+ printf("IP Filter failed to attach\n");
+ else
+ ip_init();
+}
+
+
+int
+ipfattach(void)
+{
+ int i;
+
+ for (i = 0; i < 256; i++)
+ if (cdevsw[i].d_open == ipfopen) {
+ printf("ipfattach:ipfilter @%d\n", i); break;
+ }
+ if (i == 256)
+ printf("ipfattach:ipfilter not found\n");
+ return 0;
+}
+
+void
+ipfstart(void)
+{
+ int i;
+
+ for (i = 0; i < 256; i++)
+ if (cdevsw[i].d_open == ipfopen) {
+ printf("ipfstart:ipfilter @%d\n", i);
+ break;
+ }
+ if (i==256)
+ printf("ipfstart:ipfilter not found\n");
+}
+
+
+size_t
+mbufchainlen(m0)
+ register struct mbuf *m0;
+{
+ register size_t len = 0;
+
+ for (; m0; m0 = m0->m_next)
+ len += m0->m_len;
+ return len;
+}
+
+
+/*
+ * m0 - pointer to mbuf where the IP packet starts
+ * mpp - pointer to the mbuf pointer that is the start of the mbuf chain
+ */
+int
+ipf_fastroute(m0, mpp, fin, fdp)
+ struct mbuf *m0, **mpp;
+ fr_info_t *fin;
+ frdest_t *fdp;
+{
+ register struct ip *ip, *mhip;
+ register struct mbuf *m = *mpp;
+ register struct route *ro;
+ int len, off, error = 0, hlen, code;
+ struct ifnet *ifp, *sifp;
+ struct sockaddr_in *dst;
+ struct route iproute;
+ frdest_t node;
+ frentry_t *fr;
+
+ hlen = fin->fin_hlen;
+ ip = mtod(m0, struct ip *);
+
+#ifdef USE_INET6
+ if (fin->fin_v == 6) {
+ /*
+ * currently "to <if>" and "to <if>:ip#" are not supported
+ * for IPv6
+ */
+ return ip6_output(m0, NULL, NULL, 0, NULL, NULL);
+ }
+#endif
+ /*
+ * Route packet.
+ */
+ ROUTE_RDLOCK();
+
+ ro = &iproute;
+ bzero((caddr_t)ro, sizeof (*ro));
+ dst = (struct sockaddr_in *)&ro->ro_dst;
+ dst->sin_family = AF_INET;
+ dst->sin_addr = ip->ip_dst;
+
+ fr = fin->fin_fr;
+ if ((fr != NULL) && !(fr->fr_flags & FR_KEEPSTATE) && (fdp != NULL) &&
+ (fdp->fd_type == FRD_DSTLIST)) {
+ if (ipf_dstlist_select_node(fin, fdp->fd_ptr, NULL, &node) == 0)
+ fdp = &node;
+ }
+
+ if (fdp != NULL)
+ ifp = fdp->fd_ptr;
+ else
+ ifp = fin->fin_ifp;
+
+ if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0))
+ dst->sin_addr = fdp->fd_ip.s_addr;
+
+ rtalloc(ro);
+
+ ROUTE_UNLOCK();
+
+ if (!ifp) {
+ if (!fr || !(fr->fr_flags & FR_FASTROUTE)) {
+ error = -2;
+ goto bad;
+ }
+ if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
+ if (in_localaddr(ip->ip_dst))
+ error = EHOSTUNREACH;
+ else
+ error = ENETUNREACH;
+ goto bad;
+ }
+ if (ro->ro_rt->rt_flags & RTF_GATEWAY)
+ dst = (struct sockaddr_in *)&ro->ro_rt->rt_gateway;
+ }
+ if (ro->ro_rt)
+ ro->ro_rt->rt_use++;
+
+ /*
+ * For input packets which are being "fastrouted", they won't
+ * go back through output filtering and miss their chance to get
+ * NAT'd and counted. Duplicated packets aren't considered to be
+ * part of the normal packet stream, so do not NAT them or pass
+ * them through stateful checking, etc.
+ */
+ if ((fdp != &fr->fr_dif) && (fin->fin_out == 0)) {
+ sifp = fin->fin_ifp;
+ fin->fin_ifp = ifp;
+ fin->fin_out = 1;
+ (void) ipf_acctpkt(fin, NULL);
+ fin->fin_fr = NULL;
+ if (!fr || !(fr->fr_flags & FR_RETMASK)) {
+ u_32_t pass;
+
+ (void) ipf_state_check(fin, &pass);
+ }
+
+ switch (ipf_nat_checkout(fin, NULL))
+ {
+ case 0 :
+ break;
+ case 1 :
+ ip->ip_sum = 0;
+ break;
+ case -1 :
+ error = -1;
+ goto bad;
+ break;
+ }
+
+ fin->fin_ifp = sifp;
+ fin->fin_out = 0;
+ } else
+ ip->ip_sum = 0;
+ /*
+ * If small enough for interface, can just send directly.
+ */
+ if (ntohs(ip->ip_len) <= ifp->if_mtu) {
+ if (!ip->ip_sum)
+ ip->ip_sum = in_cksum(m, hlen);
+#if IRIX >= 60500
+ error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst,
+ NULL);
+#else
+ error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst);
+#endif
+ goto done;
+ }
+ /*
+ * Too large for interface; fragment if possible.
+ * Must be able to put at least 8 bytes per fragment.
+ */
+ if (ip->ip_off & htons(IP_DF)) {
+ error = EMSGSIZE;
+ goto bad;
+ }
+ len = (ifp->if_mtu - hlen) &~ 7;
+ if (len < 8) {
+ error = EMSGSIZE;
+ goto bad;
+ }
+
+ {
+ int mhlen, firstlen = len;
+ struct mbuf **mnext = &m->m_act;
+
+ /*
+ * Loop through length of segment after first fragment,
+ * make new header and copy data of each part and link onto chain.
+ */
+ m0 = m;
+ mhlen = sizeof (struct ip);
+ for (off = hlen + len; off < ntohs(ip->ip_len); off += len) {
+ u_short ipoff, iplen;
+
+#ifdef MGETHDR
+ MGETHDR(m, M_DONTWAIT, MT_HEADER);
+#else
+ MGET(m, M_DONTWAIT, MT_HEADER);
+#endif
+ if (m == 0) {
+ error = ENOBUFS;
+ goto bad;
+ }
+#if (BSD >= 199103)
+ m->m_data += max_linkhdr;
+#else
+ m->m_off = MMAXOFF - hlen;
+#endif
+ mhip = mtod(m, struct ip *);
+ bcopy((char *)ip, (char *)mhip, sizeof(*ip));
+ if (hlen > sizeof (struct ip)) {
+ mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
+ IP_HL_A(mhip, mhlen >> 2);
+ }
+
+ m->m_len = mhlen;
+ ipoff = ntohs(ip->ip_off);
+ iplen = ntohs(ip->ip_len);
+
+ mhip->ip_off = ((off - hlen) >> 3) + (ipoff & ~IP_MF);
+ if (ipoff & IP_MF)
+ mhip->ip_off |= IP_MF;
+ if (off + len >= iplen)
+ len = iplen - off;
+ else
+ mhip->ip_off |= IP_MF;
+
+ mhip->ip_len = htons((u_short)(len + mhlen));
+ m->m_next = m_copy(m0, off, len);
+ if (m->m_next == 0) {
+ error = ENOBUFS; /* ??? */
+ goto sendorfree;
+ }
+#if (BSD >= 199103)
+ m->m_pkthdr.len = mhlen + len;
+ m->m_pkthdr.rcvif = NULL;
+#endif
+ mhip->ip_off = htons((u_short)mhip->ip_off);
+ mhip->ip_sum = 0;
+ mhip->ip_sum = in_cksum(m, mhlen);
+ *mnext = m;
+ mnext = &m->m_act;
+ }
+ /*
+ * Update first fragment by trimming what's been copied out
+ * and updating header, then send each fragment (in order).
+ */
+ m_adj(m0, hlen + firstlen - ntohs(ip->ip_len));
+ ip->ip_len = htons((u_short)(hlen + firstlen));
+ ip->ip_off = htons(IP_MF);
+ ip->ip_sum = 0;
+ ip->ip_sum = in_cksum(m0, hlen);
+sendorfree:
+ for (m = m0; m; m = m0) {
+ m0 = m->m_act;
+ m->m_act = 0;
+ if (error == 0)
+#if IRIX >= 60500
+ error = (*ifp->if_output)(ifp, m,
+ (struct sockaddr *)dst, ro->ro_rt);
+#else
+ error = (*ifp->if_output)(ifp, m,
+ (struct sockaddr *)dst);
+#endif
+ else
+ m_freem(m);
+ }
+ }
+done:
+ if (!error)
+ ipf_frouteok[0]++;
+ else
+ ipf_frouteok[1]++;
+
+ if (ro->ro_rt)
+ RTFREE(ro->ro_rt);
+ return 0;
+bad:
+ if (error == EMSGSIZE) {
+ sifp = fin->fin_ifp;
+ code = fin->fin_icode;
+ fin->fin_icode = ICMP_UNREACH_NEEDFRAG;
+ fin->fin_ifp = ifp;
+ (void) ipf_send_icmp_err(ICMP_UNREACH, fin, 1);
+ fin->fin_ifp = sifp;
+ fin->fin_icode = code;
+ }
+ m_freem(m);
+ goto done;
+}
+
+
+int
+ipf_verifysrc(fin)
+ fr_info_t *fin;
+{
+ struct sockaddr_in *dst;
+ struct route iproute;
+
+ bzero((char *)&iproute, sizeof(iproute));
+ dst = (struct sockaddr_in *)&iproute.ro_dst;
+ dst->sin_family = AF_INET;
+ dst->sin_addr.s_addr = fin->fin_saddr;
+ rtalloc(&iproute);
+ if (iproute.ro_rt == NULL)
+ return 0;
+ return (fin->fin_ifp == iproute.ro_rt->rt_ifp);
+}
+
+
+/*
+ * return the first IP Address associated with an interface
+ */
+int
+ipf_ifpaddr(softc, v, atype, ifptr, inp, inpmask)
+ ipf_main_softc_t *softc;
+ int v, atype;
+ void *ifptr;
+ i6addr_t *inp, *inpmask;
+{
+#ifdef USE_INET6
+ struct in6_addr *inp6 = NULL;
+#endif
+ struct sockaddr_in *sin, *mask;
+ struct ifaddr *ifa;
+ struct in_addr in;
+ struct ifnet *ifp;
+
+ if ((ifptr == NULL) || (ifptr == (void *)-1))
+ return -1;
+
+ mask = NULL;
+ ifp = ifptr;
+
+ if (v == 4)
+ inp->s_addr = 0;
+#ifdef USE_INET6
+ else if (v == 6)
+ bzero((char *)inp, sizeof(*inp));
+#endif
+
+#if defined(IFF_DRVRLOCK) /* IRIX 6 */
+ ifa = &((struct in_ifaddr *)ifp->in_ifaddr)->ia_ifa;
+#else
+ ifa = ifp->if_addrlist;
+#endif
+
+ sin = (struct sockaddr_in *)ifa->ifa_addr;
+ while (sin && ifa) {
+ if ((v == 4) && (sin->sin_family == AF_INET))
+ break;
+# ifdef USE_INET6
+ if ((v == 6) && (sin->sin_family == AF_INET6)) {
+ inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr;
+ if (!IN6_IS_ADDR_LINKLOCAL(inp6) &&
+ !IN6_IS_ADDR_LOOPBACK(inp6))
+ break;
+ }
+# endif
+ ifa = ifa->ifa_next;
+ if (ifa != NULL)
+ sin = (struct sockaddr_in *)ifa->ifa_addr;
+ }
+ if (ifa == NULL || sin == NULL)
+ return -1;
+
+ mask = (struct sockaddr_in *)ifa->ifa_netmask;
+ if (atype == FRI_BROADCAST)
+ sin = (struct sockaddr_in *)ifa->ifa_broadaddr;
+ else if (atype == FRI_PEERADDR)
+ sin = (struct sockaddr_in *)ifa->ifa_dstaddr;
+
+#ifdef USE_INET6
+ if (v == 6)
+ return ipf_ifpfillv6addr(atype, (struct sockaddr_in6 *)sin,
+ (struct sockaddr_in6 *)mask,
+ inp, inpmask);
+#endif
+ return ipf_ifpfillv4addr(atype, sin, mask, &inp->in4, &inpmask->in4);
+}
+
+
+void
+#if IRIX >= 60500
+ipf_slowtimer(void *arg)
+#else
+ipf_slowtimer()
+#endif
+{
+ if (ipf_running <= 0) {
+#if IRIX >= 60500
+ ipf_timer_id = 0;
+#endif
+ return;
+ }
+
+ READ_ENTER(&ipf_global);
+ if (ipf_running <= 0) {
+#if IRIX >= 60500
+ ipf_timer_id = 0;
+#endif
+ RWLOCK_EXIT(&ipf_global);
+ return;
+ }
+
+ ipf_ipfilter_intfsync();
+ ipf_expiretokens(&ipfmain);
+ ipf_frag_expire(&ipfmain);
+ ipf_state_expire(&ipfmain);
+ ipf_nat_expire(&ipfmain);
+ ipf_auth_expire(&ipfmain);
+ ipf_lookup_expire(&ipfmain);
+ ipf_rule_expire(&ipfmain);
+ ipf_ticks++;
+
+#if IRIX >= 60500
+ ipf_timer_id = timeout(ipf_slowtimer, NULL, hz/2);
+#else
+ timeout(ipf_slowtimer, NULL, hz/2);
+#endif
+ RWLOCK_EXIT(&ipf_global);
+}
+
+
+u_32_t
+ipf_newisn(fin)
+ fr_info_t *fin;
+{
+ static iss_seq_off = 0;
+ u_char hash[16];
+ u_32_t newiss;
+ MD5_CTX ctx;
+
+ /*
+ * Compute the base value of the ISS. It is a hash
+ * of (saddr, sport, daddr, dport, secret).
+ */
+ MD5Init(&ctx);
+
+ MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_src,
+ sizeof(fin->fin_fi.fi_src));
+ MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_dst,
+ sizeof(fin->fin_fi.fi_dst));
+ MD5Update(&ctx, (u_char *) &fin->fin_dat, sizeof(fin->fin_dat));
+
+ MD5Update(&ctx, ipf_iss_secret, sizeof(ipf_iss_secret));
+
+ MD5Final(hash, &ctx);
+
+ bcopy(hash, &newiss, sizeof(newiss));
+
+ /*
+ * Now increment our "timer", and add it in to
+ * the computed value.
+ *
+ * XXX Use `addin'?
+ * XXX TCP_ISSINCR too large to use?
+ */
+ iss_seq_off += 0x00010000;
+ newiss += iss_seq_off;
+ return newiss;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: ipf_nextipid */
+/* Returns: int - 0 == success, -1 == error (packet should be droppped) */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* Returns the next IPv4 ID to use for this packet. */
+/* ------------------------------------------------------------------------ */
+u_short
+ipf_nextipid(fin)
+ fr_info_t *fin;
+{
+ u_short id;
+
+ MUTEX_ENTER(&ipf_rw);
+ id = ipid++;
+ MUTEX_EXIT(&ipf_rw);
+
+ return id;
+}
+
+
+int
+ipf_checkv4sum(fin)
+ fr_info_t *fin;
+{
+ if ((fin->fin_flx & FI_NOCKSUM) != 0)
+ return 0;
+
+ if ((fin->fin_flx & FI_SHORT) != 0)
+ return 1;
+
+ if (fin->fin_cksum != FI_CK_NEEDED)
+ return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1;
+
+ if (ipf_checkl4sum(fin) == -1) {
+ fin->fin_flx |= FI_BAD;
+ return -1;
+ }
+ return 0;
+}
+
+
+#ifdef USE_INET6
+INLINE int
+ipf_checkv6sum(fin)
+ fr_info_t *fin;
+{
+ if ((fin->fin_flx & FI_NOCKSUM) != 0)
+ return 0;
+
+ if ((fin->fin_flx & FI_SHORT) != 0)
+ return 1;
+
+ if (fin->fin_cksum != FI_CK_NEEDED)
+ return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1;
+
+
+ if (ipf_checkl4sum(fin) == -1) {
+ fin->fin_flx |= FI_BAD;
+ return -1;
+ }
+ return 0;
+}
+#endif /* USE_INET6 */
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: ipf_pullup */
+/* Returns: NULL == pullup failed, else pointer to protocol header */
+/* Parameters: xmin(I)- pointer to buffer where data packet starts */
+/* fin(I) - pointer to packet information */
+/* len(I) - number of bytes to pullup */
+/* */
+/* Attempt to move at least len bytes (from the start of the buffer) into a */
+/* single buffer for ease of access. Operating system native functions are */
+/* used to manage buffers - if necessary. If the entire packet ends up in */
+/* a single buffer, set the FI_COALESCE flag even though ipf_coalesce() has */
+/* not been called. Both fin_ip and fin_dp are updated before exiting _IF_ */
+/* and ONLY if the pullup succeeds. */
+/* */
+/* We assume that 'min' is a pointer to a buffer that is part of the chain */
+/* of buffers that starts at *fin->fin_mp. */
+/* ------------------------------------------------------------------------ */
+void *
+ipf_pullup(xmin, fin, len)
+ mb_t *xmin;
+ fr_info_t *fin;
+ int len;
+{
+ int out = fin->fin_out, dpoff;
+ mb_t *m = xmin, *n;
+ char *ip;
+
+ if (m == NULL)
+ return NULL;
+
+ ip = (char *)fin->fin_ip;
+ if ((fin->fin_flx & FI_COALESCE) != 0)
+ return ip;
+
+ if (fin->fin_dp != NULL)
+ dpoff = (char *)fin->fin_dp - (char *)ip;
+ else
+ dpoff = 0;
+
+ if (M_LEN(m) < len) {
+ KMALLOCS(fin->fin_hbuf, void *, fin->fin_plen);
+ if (fin->fin_hbuf == NULL) {
+ return NULL;
+ }
+ m_copydata(m, 0, fin->fin_plen, fin->fin_hbuf);
+ ip = fin->fin_hbuf;
+ fin->fin_flx |= FI_COALESCE;
+ } else if (len == fin->fin_plen) {
+ fin->fin_flx |= FI_COALESCE;
+ }
+
+ fin->fin_ip = (ip_t *)ip;
+ if (fin->fin_dp != NULL)
+ fin->fin_dp = (char *)fin->fin_ip + dpoff;
+ if (fin->fin_fraghdr != NULL)
+ fin->fin_fraghdr = (char *)ip +
+ ((char *)fin->fin_fraghdr -
+ (char *)fin->fin_ip);
+ return ip;
+}
+
+
+int
+ipf_inject(fin, m)
+ fr_info_t *fin;
+ mb_t *m;
+{
+ int error;
+
+ if (fin->fin_out == 0) {
+ struct ifqueue *ifq;
+
+#if (IRIX >= 60516)
+ ifq = &((struct ifnet *)fin->fin_ifp)->if_snd;
+#else
+ ifq = &ipintrq;
+#endif
+
+ if (IF_QFULL(ifq)) {
+ IF_DROP(ifq);
+ FREE_MB_T(m);
+ error = ENOBUFS;
+ } else {
+ IF_ENQUEUE(ifq, m);
+#if IRIX < 60500
+ schednetisr(NETISR_IP);
+#endif
+ error = 0;
+ }
+ } else {
+#if IRIX >= 60500
+ error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL);
+#else
+ error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL);
+#endif
+ }
+
+ return error;
+}
+
+
+/*
+ * In the face of no kernel random function, this is implemented...it is
+ * not meant to be random, just a fill in.
+ */
+int
+ipf_random()
+{
+ static int last = 0;
+ static int calls = 0;
+ struct timeval tv;
+ int number;
+
+ GETKTIME(&tv);
+ last *= tv.tv_usec + calls++;
+ last += (int)&range * ipf_ticks;
+ number = last + tv.tv_sec;
+ return number;
+}
+
+u_int
+ipf_pcksum(fin, hlen, sum)
+ fr_info_t *fin;
+ int hlen;
+ u_int sum;
+{
+ union {
+ u_char c[2];
+ u_short s;
+ } bytes;
+ int add;
+
+ /*
+ * In case we had to copy the IP & TCP header out of mbufs,
+ * skip over the mbuf bits which are the header
+ */
+ if ((char *)ip != mtod(m, char *)) {
+ hlen = (char *)sp - (char *)ip;
+ while (hlen) {
+ add = MIN(hlen, m->m_len);
+ sp = (u_short *)(mtod(m, char *) + add);
+ hlen -= add;
+ if (add == m->m_len) {
+ m = m->m_next;
+ if (!hlen) {
+ if (!m)
+ break;
+ sp = mtod(m, u_short *);
+ }
+ PANIC((!m),("fr_cksum(1): not enough data"));
+ }
+ }
+ }
+
+ l4hlen =;
+ len -= (l4hlen + hlen);
+ if (len <= 0)
+ goto nodata;
+
+ while (len > 1) {
+ if (((char *)sp - mtod(m, char *)) >= m->m_len) {
+ m = m->m_next;
+ PANIC((!m),("fr_cksum(2): not enough data"));
+ sp = mtod(m, u_short *);
+ }
+ if (((char *)(sp + 1) - mtod(m, char *)) > m->m_len) {
+ bytes.c[0] = *(u_char *)sp;
+ m = m->m_next;
+ PANIC((!m),("fr_cksum(3): not enough data"));
+ sp = mtod(m, u_short *);
+ bytes.c[1] = *(u_char *)sp;
+ sum += bytes.s;
+ sp = (u_short *)((u_char *)sp + 1);
+ }
+ if ((u_long)sp & 1) {
+ bcopy((char *)sp++, (char *)&bytes.s, sizeof(bytes.s));
+ sum += bytes.s;
+ } else
+ sum += *sp++;
+ len -= 2;
+ }
+
+ if (len != 0)
+ sum += ntohs(*(u_char *)sp << 8);
+ nodata:
+ while (sum > 0xffff)
+ sum = (sum & 0xffff) + (sum >> 16);
+ sum2 = (u_short)(~sum & 0xffff);
+ return sum2;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-08-02 05:50:39 +0000