diff options
Diffstat (limited to 'sys/netinet/raw_ip.c')
| -rw-r--r-- | sys/netinet/raw_ip.c | 1130 |
1 files changed, 1130 insertions, 0 deletions
diff --git a/sys/netinet/raw_ip.c b/sys/netinet/raw_ip.c new file mode 100644 index 0000000..eddc69e --- /dev/null +++ b/sys/netinet/raw_ip.c @@ -0,0 +1,1130 @@ +/*- + * 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. + * 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 + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "opt_inet.h" +#include "opt_inet6.h" +#include "opt_ipsec.h" + +#include <sys/param.h> +#include <sys/jail.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/malloc.h> +#include <sys/mbuf.h> +#include <sys/priv.h> +#include <sys/proc.h> +#include <sys/protosw.h> +#include <sys/rwlock.h> +#include <sys/signalvar.h> +#include <sys/socket.h> +#include <sys/socketvar.h> +#include <sys/sx.h> +#include <sys/sysctl.h> +#include <sys/systm.h> + +#include <vm/uma.h> + +#include <net/if.h> +#include <net/route.h> +#include <net/vnet.h> + +#include <netinet/in.h> +#include <netinet/in_systm.h> +#include <netinet/in_pcb.h> +#include <netinet/in_var.h> +#include <netinet/if_ether.h> +#include <netinet/ip.h> +#include <netinet/ip_var.h> +#include <netinet/ip_mroute.h> + +#ifdef IPSEC +#include <netipsec/ipsec.h> +#endif /*IPSEC*/ + +#include <security/mac/mac_framework.h> + +VNET_DEFINE(int, ip_defttl) = IPDEFTTL; +SYSCTL_VNET_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_RW, + &VNET_NAME(ip_defttl), 0, + "Maximum TTL on IP packets"); + +VNET_DEFINE(struct inpcbhead, ripcb); +VNET_DEFINE(struct inpcbinfo, ripcbinfo); + +#define V_ripcb VNET(ripcb) +#define V_ripcbinfo VNET(ripcbinfo) + +/* + * Control and data hooks for ipfw, dummynet, divert and so on. + * The data hooks are not used here but it is convenient + * to keep them all in one place. + */ +VNET_DEFINE(ip_fw_chk_ptr_t, ip_fw_chk_ptr) = NULL; +VNET_DEFINE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr) = NULL; + +int (*ip_dn_ctl_ptr)(struct sockopt *); +int (*ip_dn_io_ptr)(struct mbuf **, int, struct ip_fw_args *); +void (*ip_divert_ptr)(struct mbuf *, int); +int (*ng_ipfw_input_p)(struct mbuf **, int, + struct ip_fw_args *, int); + +#ifdef INET +/* + * 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. + */ +VNET_DEFINE(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); +int (*legal_vif_num)(int); +u_long (*ip_mcast_src)(int); + +void (*rsvp_input_p)(struct mbuf *m, int off); +int (*ip_rsvp_vif)(struct socket *, struct sockopt *); +void (*ip_rsvp_force_done)(struct socket *); +#endif /* INET */ + +u_long rip_sendspace = 9216; +SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, + &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); + +u_long rip_recvspace = 9216; +SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, + &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams"); + +/* + * Hash functions + */ + +#define INP_PCBHASH_RAW_SIZE 256 +#define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \ + (((proto) + (laddr) + (faddr)) % (mask) + 1) + +#ifdef INET +static void +rip_inshash(struct inpcb *inp) +{ + struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; + struct inpcbhead *pcbhash; + int hash; + + INP_INFO_WLOCK_ASSERT(pcbinfo); + INP_WLOCK_ASSERT(inp); + + if (inp->inp_ip_p != 0 && + inp->inp_laddr.s_addr != INADDR_ANY && + inp->inp_faddr.s_addr != INADDR_ANY) { + hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr, + inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask); + } else + hash = 0; + pcbhash = &pcbinfo->ipi_hashbase[hash]; + LIST_INSERT_HEAD(pcbhash, inp, inp_hash); +} + +static void +rip_delhash(struct inpcb *inp) +{ + + INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); + INP_WLOCK_ASSERT(inp); + + LIST_REMOVE(inp, inp_hash); +} +#endif /* INET */ + +/* + * Raw interface to IP protocol. + */ + +/* + * Initialize raw connection block q. + */ +static void +rip_zone_change(void *tag) +{ + + uma_zone_set_max(V_ripcbinfo.ipi_zone, maxsockets); +} + +static int +rip_inpcb_init(void *mem, int size, int flags) +{ + struct inpcb *inp = mem; + + INP_LOCK_INIT(inp, "inp", "rawinp"); + return (0); +} + +void +rip_init(void) +{ + + in_pcbinfo_init(&V_ripcbinfo, "rip", &V_ripcb, INP_PCBHASH_RAW_SIZE, + 1, "ripcb", rip_inpcb_init, NULL, UMA_ZONE_NOFREE, + IPI_HASHFIELDS_NONE); + EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, NULL, + EVENTHANDLER_PRI_ANY); +} + +#ifdef VIMAGE +void +rip_destroy(void) +{ + + in_pcbinfo_destroy(&V_ripcbinfo); +} +#endif + +#ifdef INET +static int +rip_append(struct inpcb *last, struct ip *ip, struct mbuf *n, + struct sockaddr_in *ripsrc) +{ + int policyfail = 0; + + INP_LOCK_ASSERT(last); + +#ifdef IPSEC + /* check AH/ESP integrity. */ + if (ipsec4_in_reject(n, last)) { + policyfail = 1; + } +#endif /* IPSEC */ +#ifdef MAC + if (!policyfail && mac_inpcb_check_deliver(last, n) != 0) + policyfail = 1; +#endif + /* Check the minimum TTL for socket. */ + if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl) + policyfail = 1; + if (!policyfail) { + struct mbuf *opts = NULL; + struct socket *so; + + so = last->inp_socket; + if ((last->inp_flags & INP_CONTROLOPTS) || + (so->so_options & (SO_TIMESTAMP | SO_BINTIME))) + ip_savecontrol(last, &opts, ip, n); + SOCKBUF_LOCK(&so->so_rcv); + if (sbappendaddr_locked(&so->so_rcv, + (struct sockaddr *)ripsrc, n, opts) == 0) { + /* should notify about lost packet */ + m_freem(n); + if (opts) + m_freem(opts); + SOCKBUF_UNLOCK(&so->so_rcv); + } else + sorwakeup_locked(so); + } else + m_freem(n); + return (policyfail); +} + +/* + * Setup generic address and protocol structures for raw_input routine, then + * pass them along with mbuf chain. + */ +void +rip_input(struct mbuf *m, int off) +{ + struct ifnet *ifp; + struct ip *ip = mtod(m, struct ip *); + int proto = ip->ip_p; + struct inpcb *inp, *last; + struct sockaddr_in ripsrc; + int hash; + + bzero(&ripsrc, sizeof(ripsrc)); + ripsrc.sin_len = sizeof(ripsrc); + ripsrc.sin_family = AF_INET; + ripsrc.sin_addr = ip->ip_src; + last = NULL; + + ifp = m->m_pkthdr.rcvif; + /* + * Applications on raw sockets expect host byte order. + */ + ip->ip_len = ntohs(ip->ip_len); + ip->ip_off = ntohs(ip->ip_off); + + hash = INP_PCBHASH_RAW(proto, ip->ip_src.s_addr, + ip->ip_dst.s_addr, V_ripcbinfo.ipi_hashmask); + INP_INFO_RLOCK(&V_ripcbinfo); + LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[hash], inp_hash) { + if (inp->inp_ip_p != proto) + continue; +#ifdef INET6 + /* XXX inp locking */ + if ((inp->inp_vflag & INP_IPV4) == 0) + continue; +#endif + if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) + continue; + if (inp->inp_faddr.s_addr != ip->ip_src.s_addr) + continue; + if (jailed_without_vnet(inp->inp_cred)) { + /* + * XXX: If faddr was bound to multicast group, + * jailed raw socket will drop datagram. + */ + if (prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) + continue; + } + if (last != NULL) { + struct mbuf *n; + + n = m_copy(m, 0, (int)M_COPYALL); + if (n != NULL) + (void) rip_append(last, ip, n, &ripsrc); + /* XXX count dropped packet */ + INP_RUNLOCK(last); + } + INP_RLOCK(inp); + last = inp; + } + LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[0], inp_hash) { + if (inp->inp_ip_p && inp->inp_ip_p != proto) + continue; +#ifdef INET6 + /* XXX inp locking */ + if ((inp->inp_vflag & INP_IPV4) == 0) + continue; +#endif + if (!in_nullhost(inp->inp_laddr) && + !in_hosteq(inp->inp_laddr, ip->ip_dst)) + continue; + if (!in_nullhost(inp->inp_faddr) && + !in_hosteq(inp->inp_faddr, ip->ip_src)) + continue; + if (jailed_without_vnet(inp->inp_cred)) { + /* + * Allow raw socket in jail to receive multicast; + * assume process had PRIV_NETINET_RAW at attach, + * and fall through into normal filter path if so. + */ + if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && + prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) + continue; + } + /* + * If this raw socket has multicast state, and we + * have received a multicast, check if this socket + * should receive it, as multicast filtering is now + * the responsibility of the transport layer. + */ + if (inp->inp_moptions != NULL && + IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { + /* + * If the incoming datagram is for IGMP, allow it + * through unconditionally to the raw socket. + * + * In the case of IGMPv2, we may not have explicitly + * joined the group, and may have set IFF_ALLMULTI + * on the interface. imo_multi_filter() may discard + * control traffic we actually need to see. + * + * Userland multicast routing daemons should continue + * filter the control traffic appropriately. + */ + int blocked; + + blocked = MCAST_PASS; + if (proto != IPPROTO_IGMP) { + struct sockaddr_in group; + + bzero(&group, sizeof(struct sockaddr_in)); + group.sin_len = sizeof(struct sockaddr_in); + group.sin_family = AF_INET; + group.sin_addr = ip->ip_dst; + + blocked = imo_multi_filter(inp->inp_moptions, + ifp, + (struct sockaddr *)&group, + (struct sockaddr *)&ripsrc); + } + + if (blocked != MCAST_PASS) { + IPSTAT_INC(ips_notmember); + continue; + } + } + if (last != NULL) { + struct mbuf *n; + + n = m_copy(m, 0, (int)M_COPYALL); + if (n != NULL) + (void) rip_append(last, ip, n, &ripsrc); + /* XXX count dropped packet */ + INP_RUNLOCK(last); + } + INP_RLOCK(inp); + last = inp; + } + INP_INFO_RUNLOCK(&V_ripcbinfo); + if (last != NULL) { + if (rip_append(last, ip, m, &ripsrc) != 0) + IPSTAT_INC(ips_delivered); + INP_RUNLOCK(last); + } else { + m_freem(m); + IPSTAT_INC(ips_noproto); + IPSTAT_DEC(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, u_long dst) +{ + struct ip *ip; + int error; + struct inpcb *inp = sotoinpcb(so); + int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | + 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_NOWAIT); + if (m == NULL) + return(ENOBUFS); + + INP_RLOCK(inp); + ip = mtod(m, struct ip *); + ip->ip_tos = inp->inp_ip_tos; + if (inp->inp_flags & INP_DONTFRAG) + ip->ip_off = htons(IP_DF); + else + ip->ip_off = htons(0); + ip->ip_p = inp->inp_ip_p; + ip->ip_len = htons(m->m_pkthdr.len); + ip->ip_src = inp->inp_laddr; + if (jailed(inp->inp_cred)) { + /* + * prison_local_ip4() would be good enough but would + * let a source of INADDR_ANY pass, which we do not + * want to see from jails. We do not go through the + * pain of in_pcbladdr() for raw sockets. + */ + if (ip->ip_src.s_addr == INADDR_ANY) + error = prison_get_ip4(inp->inp_cred, + &ip->ip_src); + else + error = prison_local_ip4(inp->inp_cred, + &ip->ip_src); + if (error != 0) { + INP_RUNLOCK(inp); + m_freem(m); + return (error); + } + } + 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); + } + INP_RLOCK(inp); + ip = mtod(m, struct ip *); + error = prison_check_ip4(inp->inp_cred, &ip->ip_src); + if (error != 0) { + INP_RUNLOCK(inp); + m_freem(m); + return (error); + } + + /* + * Don't allow both user specified and setsockopt options, + * and don't allow packet length sizes that will crash. + */ + if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) + || (ip->ip_len > m->m_pkthdr.len) + || (ip->ip_len < (ip->ip_hl << 2))) { + INP_RUNLOCK(inp); + m_freem(m); + return (EINVAL); + } + if (ip->ip_id == 0) + ip->ip_id = ip_newid(); + + /* + * Applications on raw sockets pass us packets + * in host byte order. + */ + ip->ip_len = htons(ip->ip_len); + ip->ip_off = htons(ip->ip_off); + + /* + * XXX prevent ip_output from overwriting header fields. + */ + flags |= IP_RAWOUTPUT; + IPSTAT_INC(ips_rawout); + } + + if (inp->inp_flags & INP_ONESBCAST) + flags |= IP_SENDONES; + +#ifdef MAC + mac_inpcb_create_mbuf(inp, m); +#endif + + error = ip_output(m, inp->inp_options, NULL, flags, + inp->inp_moptions, inp); + INP_RUNLOCK(inp); + return (error); +} + +/* + * Raw IP socket option processing. + * + * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could + * only be created by a privileged process, and as such, socket option + * operations to manage system properties on any raw socket were allowed to + * take place without explicit additional access control checks. However, + * raw sockets can now also be created in jail(), and therefore explicit + * checks are now required. Likewise, raw sockets can be used by a process + * after it gives up privilege, so some caution is required. For options + * passed down to the IP layer via ip_ctloutput(), checks are assumed to be + * performed in ip_ctloutput() and therefore no check occurs here. + * Unilaterally checking priv_check() here breaks normal IP socket option + * operations on raw sockets. + * + * When adding new socket options here, make sure to add access control + * checks here as necessary. + * + * XXX-BZ inp locking? + */ +int +rip_ctloutput(struct socket *so, struct sockopt *sopt) +{ + struct inpcb *inp = sotoinpcb(so); + int error, optval; + + if (sopt->sopt_level != IPPROTO_IP) { + if ((sopt->sopt_level == SOL_SOCKET) && + (sopt->sopt_name == SO_SETFIB)) { + inp->inp_inc.inc_fibnum = so->so_fibnum; + return (0); + } + 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_FW3: /* generic ipfw v.3 functions */ + case IP_FW_ADD: /* ADD actually returns the body... */ + case IP_FW_GET: + case IP_FW_TABLE_GETSIZE: + case IP_FW_TABLE_LIST: + case IP_FW_NAT_GET_CONFIG: + case IP_FW_NAT_GET_LOG: + if (V_ip_fw_ctl_ptr != NULL) + error = V_ip_fw_ctl_ptr(sopt); + else + error = ENOPROTOOPT; + break; + + case IP_DUMMYNET3: /* generic dummynet v.3 functions */ + case IP_DUMMYNET_GET: + if (ip_dn_ctl_ptr != NULL) + error = ip_dn_ctl_ptr(sopt); + else + error = ENOPROTOOPT; + 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 = priv_check(curthread, PRIV_NETINET_MROUTE); + if (error != 0) + return (error); + 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 = 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_FW3: /* generic ipfw v.3 functions */ + case IP_FW_ADD: + case IP_FW_DEL: + case IP_FW_FLUSH: + case IP_FW_ZERO: + case IP_FW_RESETLOG: + case IP_FW_TABLE_ADD: + case IP_FW_TABLE_DEL: + case IP_FW_TABLE_FLUSH: + case IP_FW_NAT_CFG: + case IP_FW_NAT_DEL: + if (V_ip_fw_ctl_ptr != NULL) + error = V_ip_fw_ctl_ptr(sopt); + else + error = ENOPROTOOPT; + break; + + case IP_DUMMYNET3: /* generic dummynet v.3 functions */ + case IP_DUMMYNET_CONFIGURE: + case IP_DUMMYNET_DEL: + case IP_DUMMYNET_FLUSH: + if (ip_dn_ctl_ptr != NULL) + error = ip_dn_ctl_ptr(sopt); + else + error = ENOPROTOOPT ; + break ; + + case IP_RSVP_ON: + error = priv_check(curthread, PRIV_NETINET_MROUTE); + if (error != 0) + return (error); + error = ip_rsvp_init(so); + break; + + case IP_RSVP_OFF: + error = priv_check(curthread, PRIV_NETINET_MROUTE); + if (error != 0) + return (error); + error = ip_rsvp_done(); + break; + + case IP_RSVP_VIF_ON: + case IP_RSVP_VIF_OFF: + error = priv_check(curthread, PRIV_NETINET_MROUTE); + if (error != 0) + return (error); + 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 = priv_check(curthread, PRIV_NETINET_MROUTE); + if (error != 0) + return (error); + 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 ifnet *ifp; + int err; + int flags; + + switch (cmd) { + case PRC_IFDOWN: + IN_IFADDR_RLOCK(); + TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { + if (ia->ia_ifa.ifa_addr == sa + && (ia->ia_flags & IFA_ROUTE)) { + ifa_ref(&ia->ia_ifa); + IN_IFADDR_RUNLOCK(); + /* + * in_ifscrub kills the interface route. + */ + in_ifscrub(ia->ia_ifp, ia, 0); + /* + * 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); + ifa_free(&ia->ia_ifa); + break; + } + } + if (ia == NULL) /* If ia matched, already unlocked. */ + IN_IFADDR_RUNLOCK(); + break; + + case PRC_IFUP: + IN_IFADDR_RLOCK(); + TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { + if (ia->ia_ifa.ifa_addr == sa) + break; + } + if (ia == NULL || (ia->ia_flags & IFA_ROUTE)) { + IN_IFADDR_RUNLOCK(); + return; + } + ifa_ref(&ia->ia_ifa); + IN_IFADDR_RUNLOCK(); + flags = RTF_UP; + ifp = ia->ia_ifa.ifa_ifp; + + if ((ifp->if_flags & IFF_LOOPBACK) + || (ifp->if_flags & IFF_POINTOPOINT)) + flags |= RTF_HOST; + + err = ifa_del_loopback_route((struct ifaddr *)ia, sa); + if (err == 0) + ia->ia_flags &= ~IFA_RTSELF; + + err = rtinit(&ia->ia_ifa, RTM_ADD, flags); + if (err == 0) + ia->ia_flags |= IFA_ROUTE; + + err = ifa_add_loopback_route((struct ifaddr *)ia, sa); + if (err == 0) + ia->ia_flags |= IFA_RTSELF; + + ifa_free(&ia->ia_ifa); + break; + } +} + +static int +rip_attach(struct socket *so, int proto, struct thread *td) +{ + struct inpcb *inp; + int error; + + inp = sotoinpcb(so); + KASSERT(inp == NULL, ("rip_attach: inp != NULL")); + + error = priv_check(td, PRIV_NETINET_RAW); + if (error) + return (error); + if (proto >= IPPROTO_MAX || proto < 0) + return EPROTONOSUPPORT; + error = soreserve(so, rip_sendspace, rip_recvspace); + if (error) + return (error); + INP_INFO_WLOCK(&V_ripcbinfo); + error = in_pcballoc(so, &V_ripcbinfo); + if (error) { + INP_INFO_WUNLOCK(&V_ripcbinfo); + return (error); + } + inp = (struct inpcb *)so->so_pcb; + inp->inp_vflag |= INP_IPV4; + inp->inp_ip_p = proto; + inp->inp_ip_ttl = V_ip_defttl; + rip_inshash(inp); + INP_INFO_WUNLOCK(&V_ripcbinfo); + INP_WUNLOCK(inp); + return (0); +} + +static void +rip_detach(struct socket *so) +{ + struct inpcb *inp; + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("rip_detach: inp == NULL")); + KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, + ("rip_detach: not closed")); + + INP_INFO_WLOCK(&V_ripcbinfo); + INP_WLOCK(inp); + rip_delhash(inp); + if (so == V_ip_mrouter && ip_mrouter_done) + ip_mrouter_done(); + if (ip_rsvp_force_done) + ip_rsvp_force_done(so); + if (so == V_ip_rsvpd) + ip_rsvp_done(); + in_pcbdetach(inp); + in_pcbfree(inp); + INP_INFO_WUNLOCK(&V_ripcbinfo); +} + +static void +rip_dodisconnect(struct socket *so, struct inpcb *inp) +{ + struct inpcbinfo *pcbinfo; + + pcbinfo = inp->inp_pcbinfo; + INP_INFO_WLOCK(pcbinfo); + INP_WLOCK(inp); + rip_delhash(inp); + inp->inp_faddr.s_addr = INADDR_ANY; + rip_inshash(inp); + SOCK_LOCK(so); + so->so_state &= ~SS_ISCONNECTED; + SOCK_UNLOCK(so); + INP_WUNLOCK(inp); + INP_INFO_WUNLOCK(pcbinfo); +} + +static void +rip_abort(struct socket *so) +{ + struct inpcb *inp; + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("rip_abort: inp == NULL")); + + rip_dodisconnect(so, inp); +} + +static void +rip_close(struct socket *so) +{ + struct inpcb *inp; + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("rip_close: inp == NULL")); + + rip_dodisconnect(so, inp); +} + +static int +rip_disconnect(struct socket *so) +{ + struct inpcb *inp; + + if ((so->so_state & SS_ISCONNECTED) == 0) + return (ENOTCONN); + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("rip_disconnect: inp == NULL")); + + rip_dodisconnect(so, inp); + return (0); +} + +static int +rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) +{ + struct sockaddr_in *addr = (struct sockaddr_in *)nam; + struct inpcb *inp; + int error; + + if (nam->sa_len != sizeof(*addr)) + return (EINVAL); + + error = prison_check_ip4(td->td_ucred, &addr->sin_addr); + if (error != 0) + return (error); + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("rip_bind: inp == NULL")); + + if (TAILQ_EMPTY(&V_ifnet) || + (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || + (addr->sin_addr.s_addr && + (inp->inp_flags & INP_BINDANY) == 0 && + ifa_ifwithaddr_check((struct sockaddr *)addr) == 0)) + return (EADDRNOTAVAIL); + + INP_INFO_WLOCK(&V_ripcbinfo); + INP_WLOCK(inp); + rip_delhash(inp); + inp->inp_laddr = addr->sin_addr; + rip_inshash(inp); + INP_WUNLOCK(inp); + INP_INFO_WUNLOCK(&V_ripcbinfo); + return (0); +} + +static int +rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) +{ + struct sockaddr_in *addr = (struct sockaddr_in *)nam; + struct inpcb *inp; + + if (nam->sa_len != sizeof(*addr)) + return (EINVAL); + if (TAILQ_EMPTY(&V_ifnet)) + return (EADDRNOTAVAIL); + if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) + return (EAFNOSUPPORT); + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("rip_connect: inp == NULL")); + + INP_INFO_WLOCK(&V_ripcbinfo); + INP_WLOCK(inp); + rip_delhash(inp); + inp->inp_faddr = addr->sin_addr; + rip_inshash(inp); + soisconnected(so); + INP_WUNLOCK(inp); + INP_INFO_WUNLOCK(&V_ripcbinfo); + return (0); +} + +static int +rip_shutdown(struct socket *so) +{ + struct inpcb *inp; + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("rip_shutdown: inp == NULL")); + + INP_WLOCK(inp); + socantsendmore(so); + INP_WUNLOCK(inp); + 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; + u_long dst; + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("rip_send: inp == NULL")); + + /* + * Note: 'dst' reads below are unlocked. + */ + if (so->so_state & SS_ISCONNECTED) { + if (nam) { + m_freem(m); + return (EISCONN); + } + dst = inp->inp_faddr.s_addr; /* Unlocked read. */ + } else { + if (nam == NULL) { + m_freem(m); + return (ENOTCONN); + } + dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; + } + return (rip_output(m, so, dst)); +} +#endif /* INET */ + +static int +rip_pcblist(SYSCTL_HANDLER_ARGS) +{ + int error, i, n; + 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 = V_ripcbinfo.ipi_count; + n += imax(n / 8, 10); + req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb); + return (0); + } + + if (req->newptr != 0) + return (EPERM); + + /* + * OK, now we're committed to doing something. + */ + INP_INFO_RLOCK(&V_ripcbinfo); + gencnt = V_ripcbinfo.ipi_gencnt; + n = V_ripcbinfo.ipi_count; + INP_INFO_RUNLOCK(&V_ripcbinfo); + + 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); + + INP_INFO_RLOCK(&V_ripcbinfo); + for (inp = LIST_FIRST(V_ripcbinfo.ipi_listhead), i = 0; inp && i < n; + inp = LIST_NEXT(inp, inp_list)) { + INP_WLOCK(inp); + if (inp->inp_gencnt <= gencnt && + cr_canseeinpcb(req->td->td_ucred, inp) == 0) { + in_pcbref(inp); + inp_list[i++] = inp; + } + INP_WUNLOCK(inp); + } + INP_INFO_RUNLOCK(&V_ripcbinfo); + n = i; + + error = 0; + for (i = 0; i < n; i++) { + inp = inp_list[i]; + INP_RLOCK(inp); + if (inp->inp_gencnt <= gencnt) { + struct xinpcb xi; + + bzero(&xi, sizeof(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); + INP_RUNLOCK(inp); + error = SYSCTL_OUT(req, &xi, sizeof xi); + } else + INP_RUNLOCK(inp); + } + INP_INFO_WLOCK(&V_ripcbinfo); + for (i = 0; i < n; i++) { + inp = inp_list[i]; + INP_RLOCK(inp); + if (!in_pcbrele_rlocked(inp)) + INP_RUNLOCK(inp); + } + INP_INFO_WUNLOCK(&V_ripcbinfo); + + 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. + */ + INP_INFO_RLOCK(&V_ripcbinfo); + xig.xig_gen = V_ripcbinfo.ipi_gencnt; + xig.xig_sogen = so_gencnt; + xig.xig_count = V_ripcbinfo.ipi_count; + INP_INFO_RUNLOCK(&V_ripcbinfo); + error = SYSCTL_OUT(req, &xig, sizeof xig); + } + free(inp_list, M_TEMP); + return (error); +} + +SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, + CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0, + rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); + +#ifdef INET +struct pr_usrreqs rip_usrreqs = { + .pru_abort = rip_abort, + .pru_attach = rip_attach, + .pru_bind = rip_bind, + .pru_connect = rip_connect, + .pru_control = in_control, + .pru_detach = rip_detach, + .pru_disconnect = rip_disconnect, + .pru_peeraddr = in_getpeeraddr, + .pru_send = rip_send, + .pru_shutdown = rip_shutdown, + .pru_sockaddr = in_getsockaddr, + .pru_sosetlabel = in_pcbsosetlabel, + .pru_close = rip_close, +}; +#endif /* INET */ |
