diff options
Diffstat (limited to 'sys/netinet/raw_ip.c')
| -rw-r--r-- | sys/netinet/raw_ip.c | 916 |
1 files changed, 916 insertions, 0 deletions
diff --git a/sys/netinet/raw_ip.c b/sys/netinet/raw_ip.c new file mode 100644 index 0000000..1a1b4e0 --- /dev/null +++ b/sys/netinet/raw_ip.c @@ -0,0 +1,916 @@ +/*- + * 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 + * $FreeBSD$ + */ + +#include "opt_inet6.h" +#include "opt_ipsec.h" +#include "opt_mac.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/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 <netinet/in.h> +#include <netinet/in_systm.h> +#include <netinet/in_pcb.h> +#include <netinet/in_var.h> +#include <netinet/ip.h> +#include <netinet/ip_var.h> +#include <netinet/ip_mroute.h> + +#include <netinet/ip_fw.h> +#include <netinet/ip_dummynet.h> + +#ifdef FAST_IPSEC +#include <netipsec/ipsec.h> +#endif /*FAST_IPSEC*/ + +#include <security/mac/mac_framework.h> + +struct inpcbhead ripcb; +struct inpcbinfo ripcbinfo; + +/* control hooks for ipfw and dummynet */ +ip_fw_ctl_t *ip_fw_ctl_ptr = NULL; +ip_dn_ctl_t *ip_dn_ctl_ptr = NULL; + +/* + * 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 off); +int (*ip_rsvp_vif)(struct socket *, struct sockopt *); +void (*ip_rsvp_force_done)(struct socket *); + +/* + * Raw interface to IP protocol. + */ + +/* + * Initialize raw connection block q. + */ +static void +rip_zone_change(void *tag) +{ + + uma_zone_set_max(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) +{ + + INP_INFO_LOCK_INIT(&ripcbinfo, "rip"); + LIST_INIT(&ripcb); + ripcbinfo.ipi_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.ipi_hashbase = hashinit(1, M_PCB, &ripcbinfo.ipi_hashmask); + ripcbinfo.ipi_porthashbase = hashinit(1, M_PCB, + &ripcbinfo.ipi_porthashmask); + ripcbinfo.ipi_zone = uma_zcreate("ripcb", sizeof(struct inpcb), + NULL, NULL, rip_inpcb_init, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); + uma_zone_set_max(ripcbinfo.ipi_zone, maxsockets); + EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, + NULL, EVENTHANDLER_PRI_ANY); +} + +static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; + +static int +raw_append(struct inpcb *last, struct ip *ip, struct mbuf *n) +{ + int policyfail = 0; + + INP_LOCK_ASSERT(last); + +#ifdef FAST_IPSEC + /* check AH/ESP integrity. */ + if (ipsec4_in_reject(n, last)) { + policyfail = 1; + } +#endif /* FAST_IPSEC */ +#ifdef MAC + if (!policyfail && mac_check_inpcb_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 ip *ip = mtod(m, struct ip *); + int proto = ip->ip_p; + struct inpcb *inp, *last; + + INP_INFO_RLOCK(&ripcbinfo); + ripsrc.sin_addr = ip->ip_src; + last = NULL; + LIST_FOREACH(inp, &ripcb, inp_list) { + INP_LOCK(inp); + if (inp->inp_ip_p && inp->inp_ip_p != proto) { + docontinue: + INP_UNLOCK(inp); + continue; + } +#ifdef INET6 + if ((inp->inp_vflag & INP_IPV4) == 0) + goto docontinue; +#endif + if (inp->inp_laddr.s_addr && + inp->inp_laddr.s_addr != ip->ip_dst.s_addr) + goto docontinue; + if (inp->inp_faddr.s_addr && + inp->inp_faddr.s_addr != ip->ip_src.s_addr) + goto docontinue; + if (jailed(inp->inp_socket->so_cred)) + if (htonl(prison_getip(inp->inp_socket->so_cred)) != + ip->ip_dst.s_addr) + goto docontinue; + if (last) { + struct mbuf *n; + + n = m_copy(m, 0, (int)M_COPYALL); + if (n != NULL) + (void) raw_append(last, ip, n); + /* XXX count dropped packet */ + INP_UNLOCK(last); + } + last = inp; + } + if (last != NULL) { + if (raw_append(last, ip, m) != 0) + ipstat.ips_delivered--; + INP_UNLOCK(last); + } else { + m_freem(m); + ipstat.ips_noproto++; + ipstat.ips_delivered--; + } + INP_INFO_RUNLOCK(&ripcbinfo); +} + +/* + * 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_DONTWAIT); + if (m == NULL) + return(ENOBUFS); + + INP_LOCK(inp); + ip = mtod(m, struct ip *); + ip->ip_tos = inp->inp_ip_tos; + if (inp->inp_flags & INP_DONTFRAG) + ip->ip_off = IP_DF; + else + ip->ip_off = 0; + ip->ip_p = inp->inp_ip_p; + ip->ip_len = m->m_pkthdr.len; + if (jailed(inp->inp_socket->so_cred)) + ip->ip_src.s_addr = + htonl(prison_getip(inp->inp_socket->so_cred)); + else + 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); + } + INP_LOCK(inp); + ip = mtod(m, struct ip *); + if (jailed(inp->inp_socket->so_cred)) { + if (ip->ip_src.s_addr != + htonl(prison_getip(inp->inp_socket->so_cred))) { + INP_UNLOCK(inp); + m_freem(m); + return (EPERM); + } + } + /* 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_UNLOCK(inp); + 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++; + } + + if (inp->inp_flags & INP_ONESBCAST) + flags |= IP_SENDONES; + +#ifdef MAC + mac_create_mbuf_from_inpcb(inp, m); +#endif + + error = ip_output(m, inp->inp_options, NULL, flags, + inp->inp_moptions, inp); + INP_UNLOCK(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. + */ +int +rip_ctloutput(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: /* 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: + /* + * XXXRW: Isn't this checked one layer down? Yes, it + * is. + */ + error = priv_check(curthread, PRIV_NETINET_IPFW); + if (error != 0) + return (error); + if (ip_fw_ctl_ptr != NULL) + error = ip_fw_ctl_ptr(sopt); + else + error = ENOPROTOOPT; + break; + + case IP_DUMMYNET_GET: + error = priv_check(curthread, PRIV_NETINET_DUMMYNET); + if (error != 0) + return (error); + 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_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: + /* + * XXXRW: Isn't this checked one layer down? + */ + error = priv_check(curthread, PRIV_NETINET_IPFW); + if (error != 0) + return (error); + if (ip_fw_ctl_ptr != NULL) + error = ip_fw_ctl_ptr(sopt); + else + error = ENOPROTOOPT; + break; + + case IP_DUMMYNET_CONFIGURE: + case IP_DUMMYNET_DEL: + case IP_DUMMYNET_FLUSH: + error = priv_check(curthread, PRIV_NETINET_DUMMYNET); + if (error != 0) + return (error); + 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: + 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 = 9216; +u_long rip_recvspace = 9216; + +SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, + &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); +SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, + &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams"); + +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(&ripcbinfo); + error = in_pcballoc(so, &ripcbinfo); + if (error) { + INP_INFO_WUNLOCK(&ripcbinfo); + return error; + } + inp = (struct inpcb *)so->so_pcb; + INP_INFO_WUNLOCK(&ripcbinfo); + inp->inp_vflag |= INP_IPV4; + inp->inp_ip_p = proto; + inp->inp_ip_ttl = ip_defttl; + INP_UNLOCK(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(&ripcbinfo); + INP_LOCK(inp); + 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); + in_pcbfree(inp); + INP_INFO_WUNLOCK(&ripcbinfo); +} + +static void +rip_dodisconnect(struct socket *so, struct inpcb *inp) +{ + + INP_LOCK_ASSERT(inp); + + inp->inp_faddr.s_addr = INADDR_ANY; + SOCK_LOCK(so); + so->so_state &= ~SS_ISCONNECTED; + SOCK_UNLOCK(so); +} + +static void +rip_abort(struct socket *so) +{ + struct inpcb *inp; + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("rip_abort: inp == NULL")); + + INP_INFO_WLOCK(&ripcbinfo); + INP_LOCK(inp); + rip_dodisconnect(so, inp); + INP_UNLOCK(inp); + INP_INFO_WUNLOCK(&ripcbinfo); +} + +static void +rip_close(struct socket *so) +{ + struct inpcb *inp; + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("rip_close: inp == NULL")); + + INP_INFO_WLOCK(&ripcbinfo); + INP_LOCK(inp); + rip_dodisconnect(so, inp); + INP_UNLOCK(inp); + INP_INFO_WUNLOCK(&ripcbinfo); +} + +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")); + INP_INFO_WLOCK(&ripcbinfo); + INP_LOCK(inp); + rip_dodisconnect(so, inp); + INP_UNLOCK(inp); + INP_INFO_WUNLOCK(&ripcbinfo); + 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; + + if (nam->sa_len != sizeof(*addr)) + return EINVAL; + + if (jailed(td->td_ucred)) { + if (addr->sin_addr.s_addr == INADDR_ANY) + addr->sin_addr.s_addr = + htonl(prison_getip(td->td_ucred)); + if (htonl(prison_getip(td->td_ucred)) != addr->sin_addr.s_addr) + return (EADDRNOTAVAIL); + } + + 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 = sotoinpcb(so); + KASSERT(inp != NULL, ("rip_bind: inp == NULL")); + INP_INFO_WLOCK(&ripcbinfo); + INP_LOCK(inp); + inp->inp_laddr = addr->sin_addr; + INP_UNLOCK(inp); + INP_INFO_WUNLOCK(&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(&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(&ripcbinfo); + INP_LOCK(inp); + inp->inp_faddr = addr->sin_addr; + soisconnected(so); + INP_UNLOCK(inp); + INP_INFO_WUNLOCK(&ripcbinfo); + return 0; +} + +static int +rip_shutdown(struct socket *so) +{ + struct inpcb *inp; + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("rip_shutdown: inp == NULL")); + INP_LOCK(inp); + socantsendmore(so); + INP_UNLOCK(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); +} + +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 = 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. + */ + INP_INFO_RLOCK(&ripcbinfo); + gencnt = ripcbinfo.ipi_gencnt; + n = ripcbinfo.ipi_count; + INP_INFO_RUNLOCK(&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(&ripcbinfo); + for (inp = LIST_FIRST(ripcbinfo.ipi_listhead), i = 0; inp && i < n; + inp = LIST_NEXT(inp, inp_list)) { + INP_LOCK(inp); + if (inp->inp_gencnt <= gencnt && + cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) { + /* XXX held references? */ + inp_list[i++] = inp; + } + INP_UNLOCK(inp); + } + INP_INFO_RUNLOCK(&ripcbinfo); + n = i; + + error = 0; + for (i = 0; i < n; i++) { + inp = inp_list[i]; + INP_LOCK(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_UNLOCK(inp); + error = SYSCTL_OUT(req, &xi, sizeof xi); + } else + INP_UNLOCK(inp); + } + 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(&ripcbinfo); + xig.xig_gen = ripcbinfo.ipi_gencnt; + xig.xig_sogen = so_gencnt; + xig.xig_count = ripcbinfo.ipi_count; + INP_INFO_RUNLOCK(&ripcbinfo); + 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 = { + .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, +}; |
