/* * 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: src/sys/netinet/raw_ip.c,v 1.64.2.16 2003/08/24 08:24:38 hsu Exp $ * $DragonFly: src/sys/netinet/raw_ip.c,v 1.32 2008/07/28 15:07:28 sephe Exp $ */ #include "opt_inet6.h" #include "opt_ipsec.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define _IP_VHL #include #include #include #include #include #include #include #include #include #ifdef FAST_IPSEC #include #endif /*FAST_IPSEC*/ #ifdef IPSEC #include #endif /*IPSEC*/ struct inpcbinfo ripcbinfo; /* control hooks for ipfw and dummynet */ ip_fw_ctl_t *ip_fw_ctl_ptr; ip_dn_ctl_t *ip_dn_ctl_ptr; /* * hooks for multicast routing. They all default to NULL, * so leave them not initialized and rely on BSS being set to 0. */ /* The socket used to communicate with the multicast routing daemon. */ struct socket *ip_mrouter; /* The various mrouter and rsvp functions */ int (*ip_mrouter_set)(struct socket *, struct sockopt *); int (*ip_mrouter_get)(struct socket *, struct sockopt *); int (*ip_mrouter_done)(void); int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, struct ip_moptions *); int (*mrt_ioctl)(int, caddr_t); int (*legal_vif_num)(int); u_long (*ip_mcast_src)(int); void (*rsvp_input_p)(struct mbuf *m, ...); int (*ip_rsvp_vif)(struct socket *, struct sockopt *); void (*ip_rsvp_force_done)(struct socket *); /* * Nominal space allocated to a raw ip socket. */ #define RIPSNDQ 8192 #define RIPRCVQ 8192 /* * Raw interface to IP protocol. */ /* * Initialize raw connection block queue. */ void rip_init(void) { in_pcbinfo_init(&ripcbinfo); /* * 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.wildcardhashbase = hashinit(1, M_PCB, &ripcbinfo.wildcardhashmask); ripcbinfo.ipi_zone = zinit("ripcb", sizeof(struct inpcb), maxsockets, ZONE_INTERRUPT, 0); } /* * Setup generic address and protocol structures * for raw_input routine, then pass them along with * mbuf chain. */ void rip_input(struct mbuf *m, ...) { struct sockaddr_in ripsrc = { sizeof ripsrc, AF_INET }; struct ip *ip = mtod(m, struct ip *); struct inpcb *inp; struct inpcb *last = NULL; struct mbuf *opts = NULL; int off, proto; __va_list ap; __va_start(ap, m); off = __va_arg(ap, int); proto = __va_arg(ap, int); __va_end(ap); ripsrc.sin_addr = ip->ip_src; LIST_FOREACH(inp, &ripcbinfo.pcblisthead, inp_list) { if (inp->inp_flags & INP_PLACEMARKER) continue; #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 != INADDR_ANY && inp->inp_laddr.s_addr != ip->ip_dst.s_addr) continue; if (inp->inp_faddr.s_addr != INADDR_ANY && inp->inp_faddr.s_addr != ip->ip_src.s_addr) continue; if (last) { struct mbuf *n = m_copypacket(m, MB_DONTWAIT); #ifdef IPSEC /* check AH/ESP integrity. */ if (n && ipsec4_in_reject_so(n, last->inp_socket)) { m_freem(n); ipsecstat.in_polvio++; /* do not inject data to pcb */ } else #endif /*IPSEC*/ #ifdef FAST_IPSEC /* check AH/ESP integrity. */ if (ipsec4_in_reject(n, last)) { m_freem(n); /* do not inject data to pcb */ } else #endif /*FAST_IPSEC*/ if (n) { if (last->inp_flags & INP_CONTROLOPTS || last->inp_socket->so_options & SO_TIMESTAMP) ip_savecontrol(last, &opts, ip, n); if (ssb_appendaddr(&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; } #ifdef IPSEC /* check AH/ESP integrity. */ if (last && ipsec4_in_reject_so(m, last->inp_socket)) { m_freem(m); ipsecstat.in_polvio++; ipstat.ips_delivered--; /* do not inject data to pcb */ } else #endif /*IPSEC*/ #ifdef FAST_IPSEC /* check AH/ESP integrity. */ if (last && ipsec4_in_reject(m, last)) { m_freem(m); ipstat.ips_delivered--; /* do not inject data to pcb */ } else #endif /*FAST_IPSEC*/ /* Check the minimum TTL for socket. */ if (last && ip->ip_ttl < last->inp_ip_minttl) { m_freem(opts); ipstat.ips_delivered--; } else if (last) { if (last->inp_flags & INP_CONTROLOPTS || last->inp_socket->so_options & SO_TIMESTAMP) ip_savecontrol(last, &opts, ip, m); if (ssb_appendaddr(&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(struct mbuf *m, struct socket *so, ...) { struct ip *ip; struct inpcb *inp = so->so_pcb; __va_list ap; int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; u_long dst; __va_start(ap, so); dst = __va_arg(ap, u_long); __va_end(ap); /* * 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), MB_WAIT); if (m == NULL) return(ENOBUFS); 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 = ip_newid(); /* XXX prevent ip_output from overwriting header fields */ flags |= IP_RAWOUTPUT; ipstat.ips_rawout++; } return (ip_output(m, inp->inp_options, &inp->inp_route, flags, inp->inp_moptions, inp)); } /* * Raw IP socket option processing. */ int rip_ctloutput(struct socket *so, struct sockopt *sopt) { struct inpcb *inp = so->so_pcb; 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; soopt_from_kbuf(sopt, &optval, sizeof optval); break; case IP_FW_ADD: /* ADD actually returns the body... */ case IP_FW_GET: if (IPFW_LOADED) error = ip_fw_sockopt(sopt); else error = ENOPROTOOPT; break; case IP_DUMMYNET_GET: error = ip_dn_sockopt(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: case MRT_API_SUPPORT: case MRT_API_CONFIG: case MRT_ADD_BW_UPCALL: case MRT_DEL_BW_UPCALL: error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : EOPNOTSUPP; break; default: error = ip_ctloutput(so, sopt); break; } break; case SOPT_SET: switch (sopt->sopt_name) { case IP_HDRINCL: error = soopt_to_kbuf(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 (IPFW_LOADED) error = ip_fw_ctl_ptr(sopt); else error = ENOPROTOOPT; break; case IP_DUMMYNET_CONFIGURE: case IP_DUMMYNET_DEL: case IP_DUMMYNET_FLUSH: error = ip_dn_sockopt(sopt); break ; case IP_RSVP_ON: error = ip_rsvp_init(so); break; case IP_RSVP_OFF: error = ip_rsvp_done(); break; case IP_RSVP_VIF_ON: case IP_RSVP_VIF_OFF: error = ip_rsvp_vif ? ip_rsvp_vif(so, sopt) : EINVAL; 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: case MRT_API_SUPPORT: case MRT_API_CONFIG: case MRT_ADD_BW_UPCALL: case MRT_DEL_BW_UPCALL: error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : EOPNOTSUPP; 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(int cmd, struct sockaddr *sa, void *vip) { struct in_ifaddr *ia; struct in_ifaddr_container *iac; struct ifnet *ifp; int err; int flags; switch (cmd) { case PRC_IFDOWN: TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { ia = iac->ia; 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: ia = NULL; TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { if (iac->ia->ia_ifa.ifa_addr == sa) { ia = iac->ia; break; } } if (ia == NULL || (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 pru_attach_info *ai) { struct inpcb *inp; int error; int flag; if (jailed(ai->p_ucred) && jail_allow_raw_sockets) flag = NULL_CRED_OKAY | PRISON_ROOT; else flag = NULL_CRED_OKAY; inp = so->so_pcb; if (inp) panic("rip_attach"); if ((error = suser_cred(ai->p_ucred, flag)) != 0) return error; error = soreserve(so, rip_sendspace, rip_recvspace, ai->sb_rlimit); if (error) return error; crit_enter(); error = in_pcballoc(so, &ripcbinfo); crit_exit(); 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; return 0; } static int rip_detach(struct socket *so) { struct inpcb *inp; inp = so->so_pcb; if (inp == 0) panic("rip_detach"); if (so == ip_mrouter && ip_mrouter_done) ip_mrouter_done(); if (ip_rsvp_force_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); if (so->so_state & SS_NOFDREF) return rip_detach(so); return 0; } 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 thread *td) { struct inpcb *inp = so->so_pcb; 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 != INADDR_ANY && 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 thread *td) { struct inpcb *inp = so->so_pcb; 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 thread *td) { struct inpcb *inp = so->so_pcb; 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); } SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, &ripcbinfo, 0, in_pcblist_global, "S,xinpcb", "List of active raw IP sockets"); struct pr_usrreqs rip_usrreqs = { .pru_abort = rip_abort, .pru_accept = pru_accept_notsupp, .pru_attach = rip_attach, .pru_bind = rip_bind, .pru_connect = rip_connect, .pru_connect2 = pru_connect2_notsupp, .pru_control = in_control, .pru_detach = rip_detach, .pru_disconnect = rip_disconnect, .pru_listen = pru_listen_notsupp, .pru_peeraddr = in_setpeeraddr, .pru_rcvd = pru_rcvd_notsupp, .pru_rcvoob = pru_rcvoob_notsupp, .pru_send = rip_send, .pru_sense = pru_sense_null, .pru_shutdown = rip_shutdown, .pru_sockaddr = in_setsockaddr, .pru_sosend = sosend, .pru_soreceive = soreceive, .pru_sopoll = sopoll };