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-rw-r--r--sys/netinet/raw_ip.c660
1 files changed, 660 insertions, 0 deletions
diff --git a/sys/netinet/raw_ip.c b/sys/netinet/raw_ip.c
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--- /dev/null
+++ b/sys/netinet/raw_ip.c
@@ -0,0 +1,660 @@
+/*
+ * 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.
+ *
+ * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95
+ * $FreeBSD$
+ */
+
+#include "opt_inet6.h"
+#include "opt_ipsec.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/sysctl.h>
+
+#include <vm/vm_zone.h>
+
+#include <net/if.h>
+#include <net/route.h>
+
+#define _IP_VHL
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/in_pcb.h>
+#include <netinet/in_var.h>
+#include <netinet/ip_var.h>
+#include <netinet/ip_mroute.h>
+
+#include <netinet/ip_fw.h>
+
+#ifdef IPSEC
+#include <netinet6/ipsec.h>
+#endif /*IPSEC*/
+
+#include "opt_ipdn.h"
+#ifdef DUMMYNET
+#include <netinet/ip_dummynet.h>
+#endif
+
+struct inpcbhead ripcb;
+struct inpcbinfo ripcbinfo;
+
+/*
+ * Nominal space allocated to a raw ip socket.
+ */
+#define RIPSNDQ 8192
+#define RIPRCVQ 8192
+
+/*
+ * Raw interface to IP protocol.
+ */
+
+/*
+ * Initialize raw connection block q.
+ */
+void
+rip_init()
+{
+ LIST_INIT(&ripcb);
+ ripcbinfo.listhead = &ripcb;
+ /*
+ * XXX We don't use the hash list for raw IP, but it's easier
+ * to allocate a one entry hash list than it is to check all
+ * over the place for hashbase == NULL.
+ */
+ ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask);
+ ripcbinfo.porthashbase = hashinit(1, M_PCB, &ripcbinfo.porthashmask);
+ ripcbinfo.ipi_zone = zinit("ripcb", sizeof(struct inpcb),
+ maxsockets, ZONE_INTERRUPT, 0);
+}
+
+static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
+/*
+ * Setup generic address and protocol structures
+ * for raw_input routine, then pass them along with
+ * mbuf chain.
+ */
+void
+rip_input(m, off, proto)
+ struct mbuf *m;
+ int off, proto;
+{
+ register struct ip *ip = mtod(m, struct ip *);
+ register struct inpcb *inp;
+ struct inpcb *last = 0;
+ struct mbuf *opts = 0;
+
+ ripsrc.sin_addr = ip->ip_src;
+ LIST_FOREACH(inp, &ripcb, inp_list) {
+#ifdef INET6
+ if ((inp->inp_vflag & INP_IPV4) == 0)
+ continue;
+#endif
+ if (inp->inp_ip_p && inp->inp_ip_p != proto)
+ continue;
+ if (inp->inp_laddr.s_addr &&
+ inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
+ continue;
+ if (inp->inp_faddr.s_addr &&
+ inp->inp_faddr.s_addr != ip->ip_src.s_addr)
+ continue;
+ if (last) {
+ struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
+ if (n) {
+ if (last->inp_flags & INP_CONTROLOPTS ||
+ last->inp_socket->so_options & SO_TIMESTAMP)
+ ip_savecontrol(last, &opts, ip, n);
+ if (sbappendaddr(&last->inp_socket->so_rcv,
+ (struct sockaddr *)&ripsrc, n,
+ opts) == 0) {
+ /* should notify about lost packet */
+ m_freem(n);
+ if (opts)
+ m_freem(opts);
+ } else
+ sorwakeup(last->inp_socket);
+ opts = 0;
+ }
+ }
+ last = inp;
+ }
+ if (last) {
+ if (last->inp_flags & INP_CONTROLOPTS ||
+ last->inp_socket->so_options & SO_TIMESTAMP)
+ ip_savecontrol(last, &opts, ip, m);
+ if (sbappendaddr(&last->inp_socket->so_rcv,
+ (struct sockaddr *)&ripsrc, m, opts) == 0) {
+ m_freem(m);
+ if (opts)
+ m_freem(opts);
+ } else
+ sorwakeup(last->inp_socket);
+ } else {
+ m_freem(m);
+ ipstat.ips_noproto++;
+ ipstat.ips_delivered--;
+ }
+}
+
+/*
+ * Generate IP header and pass packet to ip_output.
+ * Tack on options user may have setup with control call.
+ */
+int
+rip_output(m, so, dst)
+ struct mbuf *m;
+ struct socket *so;
+ u_long dst;
+{
+ register struct ip *ip;
+ register struct inpcb *inp = sotoinpcb(so);
+ int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
+
+ /*
+ * If the user handed us a complete IP packet, use it.
+ * Otherwise, allocate an mbuf for a header and fill it in.
+ */
+ if ((inp->inp_flags & INP_HDRINCL) == 0) {
+ if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
+ m_freem(m);
+ return(EMSGSIZE);
+ }
+ M_PREPEND(m, sizeof(struct ip), M_TRYWAIT);
+ ip = mtod(m, struct ip *);
+ ip->ip_tos = inp->inp_ip_tos;
+ ip->ip_off = 0;
+ ip->ip_p = inp->inp_ip_p;
+ ip->ip_len = m->m_pkthdr.len;
+ ip->ip_src = inp->inp_laddr;
+ ip->ip_dst.s_addr = dst;
+ ip->ip_ttl = inp->inp_ip_ttl;
+ } else {
+ if (m->m_pkthdr.len > IP_MAXPACKET) {
+ m_freem(m);
+ return(EMSGSIZE);
+ }
+ ip = mtod(m, struct ip *);
+ /* don't allow both user specified and setsockopt options,
+ and don't allow packet length sizes that will crash */
+ if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2))
+ && inp->inp_options)
+ || (ip->ip_len > m->m_pkthdr.len)
+ || (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) {
+ m_freem(m);
+ return EINVAL;
+ }
+ if (ip->ip_id == 0)
+ ip->ip_id = htons(ip_id++);
+ /* XXX prevent ip_output from overwriting header fields */
+ flags |= IP_RAWOUTPUT;
+ ipstat.ips_rawout++;
+ }
+
+#ifdef IPSEC
+ ipsec_setsocket(m, so);
+#endif /*IPSEC*/
+
+ return (ip_output(m, inp->inp_options, &inp->inp_route, flags,
+ inp->inp_moptions));
+}
+
+/*
+ * Raw IP socket option processing.
+ */
+int
+rip_ctloutput(so, sopt)
+ struct socket *so;
+ struct sockopt *sopt;
+{
+ struct inpcb *inp = sotoinpcb(so);
+ int error, optval;
+
+ if (sopt->sopt_level != IPPROTO_IP)
+ return (EINVAL);
+
+ error = 0;
+
+ switch (sopt->sopt_dir) {
+ case SOPT_GET:
+ switch (sopt->sopt_name) {
+ case IP_HDRINCL:
+ optval = inp->inp_flags & INP_HDRINCL;
+ error = sooptcopyout(sopt, &optval, sizeof optval);
+ break;
+
+ case IP_FW_ADD:
+ case IP_FW_GET:
+ if (ip_fw_ctl_ptr == 0)
+ error = ENOPROTOOPT;
+ else
+ error = ip_fw_ctl_ptr(sopt);
+ break;
+
+#ifdef DUMMYNET
+ case IP_DUMMYNET_GET:
+ if (ip_dn_ctl_ptr == NULL)
+ error = ENOPROTOOPT ;
+ else
+ error = ip_dn_ctl_ptr(sopt);
+ break ;
+#endif /* DUMMYNET */
+
+ case MRT_INIT:
+ case MRT_DONE:
+ case MRT_ADD_VIF:
+ case MRT_DEL_VIF:
+ case MRT_ADD_MFC:
+ case MRT_DEL_MFC:
+ case MRT_VERSION:
+ case MRT_ASSERT:
+ error = ip_mrouter_get(so, sopt);
+ break;
+
+ default:
+ error = ip_ctloutput(so, sopt);
+ break;
+ }
+ break;
+
+ case SOPT_SET:
+ switch (sopt->sopt_name) {
+ case IP_HDRINCL:
+ error = sooptcopyin(sopt, &optval, sizeof optval,
+ sizeof optval);
+ if (error)
+ break;
+ if (optval)
+ inp->inp_flags |= INP_HDRINCL;
+ else
+ inp->inp_flags &= ~INP_HDRINCL;
+ break;
+
+ case IP_FW_ADD:
+ case IP_FW_DEL:
+ case IP_FW_FLUSH:
+ case IP_FW_ZERO:
+ case IP_FW_RESETLOG:
+ if (ip_fw_ctl_ptr == 0)
+ error = ENOPROTOOPT;
+ else
+ error = ip_fw_ctl_ptr(sopt);
+ break;
+
+#ifdef DUMMYNET
+ case IP_DUMMYNET_CONFIGURE:
+ case IP_DUMMYNET_DEL:
+ case IP_DUMMYNET_FLUSH:
+ if (ip_dn_ctl_ptr == NULL)
+ error = ENOPROTOOPT ;
+ else
+ error = ip_dn_ctl_ptr(sopt);
+ break ;
+#endif
+
+ case IP_RSVP_ON:
+ error = ip_rsvp_init(so);
+ break;
+
+ case IP_RSVP_OFF:
+ error = ip_rsvp_done();
+ break;
+
+ /* XXX - should be combined */
+ case IP_RSVP_VIF_ON:
+ error = ip_rsvp_vif_init(so, sopt);
+ break;
+
+ case IP_RSVP_VIF_OFF:
+ error = ip_rsvp_vif_done(so, sopt);
+ break;
+
+ case MRT_INIT:
+ case MRT_DONE:
+ case MRT_ADD_VIF:
+ case MRT_DEL_VIF:
+ case MRT_ADD_MFC:
+ case MRT_DEL_MFC:
+ case MRT_VERSION:
+ case MRT_ASSERT:
+ error = ip_mrouter_set(so, sopt);
+ break;
+
+ default:
+ error = ip_ctloutput(so, sopt);
+ break;
+ }
+ break;
+ }
+
+ return (error);
+}
+
+/*
+ * This function exists solely to receive the PRC_IFDOWN messages which
+ * are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa,
+ * and calls in_ifadown() to remove all routes corresponding to that address.
+ * It also receives the PRC_IFUP messages from if_up() and reinstalls the
+ * interface routes.
+ */
+void
+rip_ctlinput(cmd, sa, vip)
+ int cmd;
+ struct sockaddr *sa;
+ void *vip;
+{
+ struct in_ifaddr *ia;
+ struct ifnet *ifp;
+ int err;
+ int flags;
+
+ switch (cmd) {
+ case PRC_IFDOWN:
+ TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
+ if (ia->ia_ifa.ifa_addr == sa
+ && (ia->ia_flags & IFA_ROUTE)) {
+ /*
+ * in_ifscrub kills the interface route.
+ */
+ in_ifscrub(ia->ia_ifp, ia);
+ /*
+ * in_ifadown gets rid of all the rest of
+ * the routes. This is not quite the right
+ * thing to do, but at least if we are running
+ * a routing process they will come back.
+ */
+ in_ifadown(&ia->ia_ifa, 0);
+ break;
+ }
+ }
+ break;
+
+ case PRC_IFUP:
+ TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
+ if (ia->ia_ifa.ifa_addr == sa)
+ break;
+ }
+ if (ia == 0 || (ia->ia_flags & IFA_ROUTE))
+ return;
+ flags = RTF_UP;
+ ifp = ia->ia_ifa.ifa_ifp;
+
+ if ((ifp->if_flags & IFF_LOOPBACK)
+ || (ifp->if_flags & IFF_POINTOPOINT))
+ flags |= RTF_HOST;
+
+ err = rtinit(&ia->ia_ifa, RTM_ADD, flags);
+ if (err == 0)
+ ia->ia_flags |= IFA_ROUTE;
+ break;
+ }
+}
+
+u_long rip_sendspace = RIPSNDQ;
+u_long rip_recvspace = RIPRCVQ;
+
+SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
+ &rip_sendspace, 0, "Maximum outgoing raw IP datagram size");
+SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW,
+ &rip_recvspace, 0, "Maximum incoming raw IP datagram size");
+
+static int
+rip_attach(struct socket *so, int proto, struct proc *p)
+{
+ struct inpcb *inp;
+ int error, s;
+
+ inp = sotoinpcb(so);
+ if (inp)
+ panic("rip_attach");
+ if (p && (error = suser(p)) != 0)
+ return error;
+
+ error = soreserve(so, rip_sendspace, rip_recvspace);
+ if (error)
+ return error;
+ s = splnet();
+ error = in_pcballoc(so, &ripcbinfo, p);
+ splx(s);
+ if (error)
+ return error;
+ inp = (struct inpcb *)so->so_pcb;
+ inp->inp_vflag |= INP_IPV4;
+ inp->inp_ip_p = proto;
+ inp->inp_ip_ttl = ip_defttl;
+#ifdef IPSEC
+ error = ipsec_init_policy(so, &inp->inp_sp);
+ if (error != 0) {
+ in_pcbdetach(inp);
+ return error;
+ }
+#endif /*IPSEC*/
+ return 0;
+}
+
+static int
+rip_detach(struct socket *so)
+{
+ struct inpcb *inp;
+
+ inp = sotoinpcb(so);
+ if (inp == 0)
+ panic("rip_detach");
+ if (so == ip_mrouter)
+ ip_mrouter_done();
+ ip_rsvp_force_done(so);
+ if (so == ip_rsvpd)
+ ip_rsvp_done();
+ in_pcbdetach(inp);
+ return 0;
+}
+
+static int
+rip_abort(struct socket *so)
+{
+ soisdisconnected(so);
+ return rip_detach(so);
+}
+
+static int
+rip_disconnect(struct socket *so)
+{
+ if ((so->so_state & SS_ISCONNECTED) == 0)
+ return ENOTCONN;
+ return rip_abort(so);
+}
+
+static int
+rip_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
+{
+ struct inpcb *inp = sotoinpcb(so);
+ struct sockaddr_in *addr = (struct sockaddr_in *)nam;
+
+ if (nam->sa_len != sizeof(*addr))
+ return EINVAL;
+
+ if (TAILQ_EMPTY(&ifnet) || ((addr->sin_family != AF_INET) &&
+ (addr->sin_family != AF_IMPLINK)) ||
+ (addr->sin_addr.s_addr &&
+ ifa_ifwithaddr((struct sockaddr *)addr) == 0))
+ return EADDRNOTAVAIL;
+ inp->inp_laddr = addr->sin_addr;
+ return 0;
+}
+
+static int
+rip_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
+{
+ struct inpcb *inp = sotoinpcb(so);
+ struct sockaddr_in *addr = (struct sockaddr_in *)nam;
+
+ if (nam->sa_len != sizeof(*addr))
+ return EINVAL;
+ if (TAILQ_EMPTY(&ifnet))
+ return EADDRNOTAVAIL;
+ if ((addr->sin_family != AF_INET) &&
+ (addr->sin_family != AF_IMPLINK))
+ return EAFNOSUPPORT;
+ inp->inp_faddr = addr->sin_addr;
+ soisconnected(so);
+ return 0;
+}
+
+static int
+rip_shutdown(struct socket *so)
+{
+ socantsendmore(so);
+ return 0;
+}
+
+static int
+rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
+ struct mbuf *control, struct proc *p)
+{
+ struct inpcb *inp = sotoinpcb(so);
+ register u_long dst;
+
+ if (so->so_state & SS_ISCONNECTED) {
+ if (nam) {
+ m_freem(m);
+ return EISCONN;
+ }
+ dst = inp->inp_faddr.s_addr;
+ } else {
+ if (nam == NULL) {
+ m_freem(m);
+ return ENOTCONN;
+ }
+ dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr;
+ }
+ return rip_output(m, so, dst);
+}
+
+static int
+rip_pcblist(SYSCTL_HANDLER_ARGS)
+{
+ int error, i, n, s;
+ struct inpcb *inp, **inp_list;
+ inp_gen_t gencnt;
+ struct xinpgen xig;
+
+ /*
+ * The process of preparing the TCB list is too time-consuming and
+ * resource-intensive to repeat twice on every request.
+ */
+ if (req->oldptr == 0) {
+ n = ripcbinfo.ipi_count;
+ req->oldidx = 2 * (sizeof xig)
+ + (n + n/8) * sizeof(struct xinpcb);
+ return 0;
+ }
+
+ if (req->newptr != 0)
+ return EPERM;
+
+ /*
+ * OK, now we're committed to doing something.
+ */
+ s = splnet();
+ gencnt = ripcbinfo.ipi_gencnt;
+ n = ripcbinfo.ipi_count;
+ splx(s);
+
+ xig.xig_len = sizeof xig;
+ xig.xig_count = n;
+ xig.xig_gen = gencnt;
+ xig.xig_sogen = so_gencnt;
+ error = SYSCTL_OUT(req, &xig, sizeof xig);
+ if (error)
+ return error;
+
+ inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
+ if (inp_list == 0)
+ return ENOMEM;
+
+ s = splnet();
+ for (inp = LIST_FIRST(ripcbinfo.listhead), i = 0; inp && i < n;
+ inp = LIST_NEXT(inp, inp_list)) {
+ if (inp->inp_gencnt <= gencnt)
+ inp_list[i++] = inp;
+ }
+ splx(s);
+ n = i;
+
+ error = 0;
+ for (i = 0; i < n; i++) {
+ inp = inp_list[i];
+ if (inp->inp_gencnt <= gencnt) {
+ struct xinpcb xi;
+ xi.xi_len = sizeof xi;
+ /* XXX should avoid extra copy */
+ bcopy(inp, &xi.xi_inp, sizeof *inp);
+ if (inp->inp_socket)
+ sotoxsocket(inp->inp_socket, &xi.xi_socket);
+ error = SYSCTL_OUT(req, &xi, sizeof xi);
+ }
+ }
+ if (!error) {
+ /*
+ * Give the user an updated idea of our state.
+ * If the generation differs from what we told
+ * her before, she knows that something happened
+ * while we were processing this request, and it
+ * might be necessary to retry.
+ */
+ s = splnet();
+ xig.xig_gen = ripcbinfo.ipi_gencnt;
+ xig.xig_sogen = so_gencnt;
+ xig.xig_count = ripcbinfo.ipi_count;
+ splx(s);
+ error = SYSCTL_OUT(req, &xig, sizeof xig);
+ }
+ free(inp_list, M_TEMP);
+ return error;
+}
+
+SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0,
+ rip_pcblist, "S,xinpcb", "List of active raw IP sockets");
+
+struct pr_usrreqs rip_usrreqs = {
+ rip_abort, pru_accept_notsupp, rip_attach, rip_bind, rip_connect,
+ pru_connect2_notsupp, in_control, rip_detach, rip_disconnect,
+ pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp,
+ pru_rcvoob_notsupp, rip_send, pru_sense_null, rip_shutdown,
+ in_setsockaddr, sosend, soreceive, sopoll
+};
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