/* * 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. 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 $ */ #include "opt_inet6.h" #include "opt_carp.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CARP #include #endif #include #define _IP_VHL #include #include #include #include #include #include #include #include #include #include #include struct inpcbinfo ripcbinfo; struct inpcbportinfo ripcbportinfo; /* * 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)(u_long, caddr_t); int (*legal_vif_num)(int); u_long (*ip_mcast_src)(int); int (*rsvp_input_p)(struct mbuf **, int *, int); 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, 0, FALSE); in_pcbportinfo_init(&ripcbportinfo, 1, 0); /* * 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); in_pcbportinfo_set(&ripcbinfo, &ripcbportinfo, 1); ripcbinfo.wildcardhashbase = hashinit(1, M_PCB, &ripcbinfo.wildcardhashmask); ripcbinfo.ipi_size = sizeof(struct inpcb); } /* * Setup generic address and protocol structures * for raw_input routine, then pass them along with * mbuf chain. */ int rip_input(struct mbuf **mp, int *offp, int proto) { struct sockaddr_in ripsrc = { sizeof ripsrc, AF_INET }; struct mbuf *m = *mp; struct ip *ip = mtod(m, struct ip *); struct inpcb *inp; struct inpcb *last = NULL; struct mbuf *opts = NULL; ASSERT_NETISR0; *mp = NULL; ripsrc.sin_addr = ip->ip_src; LIST_FOREACH(inp, &ripcbinfo.pcblisthead, inp_list) { if (inp->inp_flags & INP_PLACEMARKER) continue; #ifdef INET6 if (!INP_ISIPV4(inp)) 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, M_NOWAIT); if (n) { lwkt_gettoken(&last->inp_socket->so_rcv.ssb_token); 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) { m_freem(n); if (opts) m_freem(opts); soroverflow(last->inp_socket); } else { sorwakeup(last->inp_socket); } lwkt_reltoken(&last->inp_socket->so_rcv.ssb_token); opts = NULL; } } last = inp; } /* 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); lwkt_gettoken(&last->inp_socket->so_rcv.ssb_token); if (ssb_appendaddr(&last->inp_socket->so_rcv, (struct sockaddr *)&ripsrc, m, opts) == 0) { m_freem(m); if (opts) m_freem(opts); soroverflow(last->inp_socket); } else { sorwakeup(last->inp_socket); } lwkt_reltoken(&last->inp_socket->so_rcv.ssb_token); } else { m_freem(m); ipstat.ips_noproto++; ipstat.ips_delivered--; } return(IPPROTO_DONE); } /* * 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; ASSERT_NETISR0; __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), M_WAITOK); 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 = htons(m->m_pkthdr.len); /* incls header now */ ip->ip_src = inp->inp_laddr; ip->ip_dst.s_addr = dst; ip->ip_ttl = inp->inp_ip_ttl; } else { int hlen; int ip_len; if (m->m_pkthdr.len > IP_MAXPACKET) { m_freem(m); return(EMSGSIZE); } if (m->m_len < sizeof(struct ip)) { m = m_pullup(m, sizeof(struct ip)); if (m == NULL) return ENOBUFS; } ip = mtod(m, struct ip *); hlen = IP_VHL_HL(ip->ip_vhl) << 2; ip_len = ntohs(ip->ip_len); /* includes header */ /* * Don't allow both user specified and setsockopt options. * Don't allow packet length sizes that will crash. */ if (hlen < sizeof(struct ip) || (hlen != sizeof(struct ip) && inp->inp_options) || ip_len > m->m_pkthdr.len || ip_len < hlen) { m_freem(m); return EINVAL; } /* * System supplies ip_id if passed as 0. */ if (ip->ip_id == 0) ip->ip_id = ip_newid(); /* 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. */ void rip_ctloutput(netmsg_t msg) { struct socket *so = msg->base.nm_so; struct sockopt *sopt = msg->ctloutput.nm_sopt; struct inpcb *inp = so->so_pcb; int error, optval; ASSERT_NETISR0; error = 0; /* Get socket's owner cpuid hint */ if (sopt->sopt_level == SOL_SOCKET && sopt->sopt_dir == SOPT_GET && sopt->sopt_name == SO_CPUHINT) { optval = mycpuid; soopt_from_kbuf(sopt, &optval, sizeof(optval)); goto done; } if (sopt->sopt_level != IPPROTO_IP) { error = EINVAL; goto done; } 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_X: error = ip_fw3_sockopt(sopt); break; case IP_FW_ADD: /* ADD actually returns the body... */ case IP_FW_GET: case IP_FW_TBL_GET: case IP_FW_TBL_EXPIRE: /* returns # of expired addresses */ error = ip_fw_sockopt(sopt); 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: ip_ctloutput(msg); /* msg invalid now */ return; } 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_X: error = ip_fw3_sockopt(sopt); break; case IP_FW_ADD: case IP_FW_DEL: case IP_FW_FLUSH: case IP_FW_ZERO: case IP_FW_RESETLOG: case IP_FW_TBL_CREATE: case IP_FW_TBL_DESTROY: case IP_FW_TBL_ADD: case IP_FW_TBL_DEL: case IP_FW_TBL_FLUSH: case IP_FW_TBL_ZERO: case IP_FW_TBL_EXPIRE: error = ip_fw_sockopt(sopt); 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: ip_ctloutput(msg); /* msg invalid now */ return; } break; } done: lwkt_replymsg(&msg->lmsg, error); } 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 void rip_attach(netmsg_t msg) { struct socket *so = msg->base.nm_so; int proto = msg->attach.nm_proto; struct pru_attach_info *ai = msg->attach.nm_ai; struct inpcb *inp; int error; ASSERT_NETISR0; inp = so->so_pcb; if (inp) panic("rip_attach"); error = caps_priv_check(ai->p_ucred, SYSCAP_NONET_RAW | __SYSCAP_NULLCRED); if (error) goto done; error = soreserve(so, rip_sendspace, rip_recvspace, ai->sb_rlimit); if (error) goto done; error = in_pcballoc(so, &ripcbinfo); if (error == 0) { inp = (struct inpcb *)so->so_pcb; inp->inp_ip_p = proto; inp->inp_ip_ttl = ip_defttl; } done: lwkt_replymsg(&msg->lmsg, error); } static void rip_detach(netmsg_t msg) { struct socket *so = msg->base.nm_so; struct inpcb *inp; ASSERT_NETISR0; inp = so->so_pcb; if (inp == NULL) 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); lwkt_replymsg(&msg->lmsg, 0); } static void rip_abort(netmsg_t msg) { /* * Raw socket does not support listen(2), * so this should never be called. */ panic("rip_abort is called"); } static void rip_disconnect(netmsg_t msg) { struct socket *so = msg->base.nm_so; int error; ASSERT_NETISR0; if (so->so_state & SS_ISCONNECTED) { soisdisconnected(so); error = 0; } else { error = ENOTCONN; } lwkt_replymsg(&msg->lmsg, error); } static void rip_bind(netmsg_t msg) { struct socket *so = msg->base.nm_so; struct sockaddr *nam = msg->bind.nm_nam; struct inpcb *inp = so->so_pcb; struct sockaddr_in *addr = (struct sockaddr_in *)nam; int error; ASSERT_NETISR0; if (nam->sa_len == sizeof(*addr)) { if (ifnet_array_isempty() || ((addr->sin_family != AF_INET) && (addr->sin_family != AF_IMPLINK)) || (addr->sin_addr.s_addr != INADDR_ANY && ifa_ifwithaddr((struct sockaddr *)addr) == 0)) { error = EADDRNOTAVAIL; } else { inp->inp_laddr = addr->sin_addr; error = 0; } } else { error = EINVAL; } lwkt_replymsg(&msg->lmsg, error); } static void rip_connect(netmsg_t msg) { struct socket *so = msg->base.nm_so; struct sockaddr *nam = msg->connect.nm_nam; struct inpcb *inp = so->so_pcb; struct sockaddr_in *addr = (struct sockaddr_in *)nam; int error; ASSERT_NETISR0; if (nam->sa_len != sizeof(*addr)) { error = EINVAL; } else if (ifnet_array_isempty()) { error = EADDRNOTAVAIL; } else { if ((addr->sin_family != AF_INET) && (addr->sin_family != AF_IMPLINK)) { error = EAFNOSUPPORT; } else { inp->inp_faddr = addr->sin_addr; soisconnected(so); error = 0; } } lwkt_replymsg(&msg->lmsg, error); } static void rip_shutdown(netmsg_t msg) { ASSERT_NETISR0; socantsendmore(msg->base.nm_so); lwkt_replymsg(&msg->lmsg, 0); } static void rip_send(netmsg_t msg) { struct socket *so = msg->base.nm_so; struct mbuf *m = msg->send.nm_m; /*struct mbuf *control = msg->send.nm_control;*/ struct sockaddr *nam = msg->send.nm_addr; /*int flags = msg->send.nm_flags;*/ struct inpcb *inp = so->so_pcb; u_long dst; int error; ASSERT_NETISR0; if (so->so_state & SS_ISCONNECTED) { if (nam) { m_freem(m); error = EISCONN; } else { dst = inp->inp_faddr.s_addr; error = rip_output(m, so, dst); } } else { if (nam == NULL) { m_freem(m); error = ENOTCONN; } else { dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; error = rip_output(m, so, dst); } } lwkt_replymsg(&msg->lmsg, error); } SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, &ripcbinfo, 1, in_pcblist_range, "S,xinpcb", "List of active raw IP sockets"); struct pr_usrreqs rip_usrreqs = { .pru_abort = rip_abort, .pru_accept = pr_generic_notsupp, .pru_attach = rip_attach, .pru_bind = rip_bind, .pru_connect = rip_connect, .pru_connect2 = pr_generic_notsupp, .pru_control = in_control_dispatch, .pru_detach = rip_detach, .pru_disconnect = rip_disconnect, .pru_listen = pr_generic_notsupp, .pru_peeraddr = in_setpeeraddr_dispatch, .pru_rcvd = pr_generic_notsupp, .pru_rcvoob = pr_generic_notsupp, .pru_send = rip_send, .pru_sense = pru_sense_null, .pru_shutdown = rip_shutdown, .pru_sockaddr = in_setsockaddr_dispatch, .pru_sosend = sosend, .pru_soreceive = soreceive };