diff options
author | rgrimes <rgrimes@FreeBSD.org> | 1994-05-24 10:09:53 +0000 |
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committer | rgrimes <rgrimes@FreeBSD.org> | 1994-05-24 10:09:53 +0000 |
commit | 8fb65ce818b3e3c6f165b583b910af24000768a5 (patch) | |
tree | ba751e4f2166aefec707c9d7401c7ff432506642 /sys/netinet/in_pcb.c | |
parent | a6ce65d368e623088a4c1a29865889f431b15420 (diff) | |
download | FreeBSD-src-8fb65ce818b3e3c6f165b583b910af24000768a5.zip FreeBSD-src-8fb65ce818b3e3c6f165b583b910af24000768a5.tar.gz |
BSD 4.4 Lite Kernel Sources
Diffstat (limited to 'sys/netinet/in_pcb.c')
-rw-r--r-- | sys/netinet/in_pcb.c | 497 |
1 files changed, 497 insertions, 0 deletions
diff --git a/sys/netinet/in_pcb.c b/sys/netinet/in_pcb.c new file mode 100644 index 0000000..01b6b17 --- /dev/null +++ b/sys/netinet/in_pcb.c @@ -0,0 +1,497 @@ +/* + * Copyright (c) 1982, 1986, 1991, 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. + * + * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/malloc.h> +#include <sys/mbuf.h> +#include <sys/protosw.h> +#include <sys/socket.h> +#include <sys/socketvar.h> +#include <sys/ioctl.h> +#include <sys/errno.h> +#include <sys/time.h> +#include <sys/proc.h> + +#include <net/if.h> +#include <net/route.h> + +#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> + +struct in_addr zeroin_addr; + +int +in_pcballoc(so, head) + struct socket *so; + struct inpcb *head; +{ + register struct inpcb *inp; + + MALLOC(inp, struct inpcb *, sizeof(*inp), M_PCB, M_WAITOK); + if (inp == NULL) + return (ENOBUFS); + bzero((caddr_t)inp, sizeof(*inp)); + inp->inp_head = head; + inp->inp_socket = so; + insque(inp, head); + so->so_pcb = (caddr_t)inp; + return (0); +} + +int +in_pcbbind(inp, nam) + register struct inpcb *inp; + struct mbuf *nam; +{ + register struct socket *so = inp->inp_socket; + register struct inpcb *head = inp->inp_head; + register struct sockaddr_in *sin; + struct proc *p = curproc; /* XXX */ + u_short lport = 0; + int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); + int error; + + if (in_ifaddr == 0) + return (EADDRNOTAVAIL); + if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY) + return (EINVAL); + if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 && + ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || + (so->so_options & SO_ACCEPTCONN) == 0)) + wild = INPLOOKUP_WILDCARD; + if (nam) { + sin = mtod(nam, struct sockaddr_in *); + if (nam->m_len != sizeof (*sin)) + return (EINVAL); +#ifdef notdef + /* + * We should check the family, but old programs + * incorrectly fail to initialize it. + */ + if (sin->sin_family != AF_INET) + return (EAFNOSUPPORT); +#endif + lport = sin->sin_port; + if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) { + /* + * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; + * allow complete duplication of binding if + * SO_REUSEPORT is set, or if SO_REUSEADDR is set + * and a multicast address is bound on both + * new and duplicated sockets. + */ + if (so->so_options & SO_REUSEADDR) + reuseport = SO_REUSEADDR|SO_REUSEPORT; + } else if (sin->sin_addr.s_addr != INADDR_ANY) { + sin->sin_port = 0; /* yech... */ + if (ifa_ifwithaddr((struct sockaddr *)sin) == 0) + return (EADDRNOTAVAIL); + } + if (lport) { + struct inpcb *t; + + /* GROSS */ + if (ntohs(lport) < IPPORT_RESERVED && + (error = suser(p->p_ucred, &p->p_acflag))) + return (error); + t = in_pcblookup(head, zeroin_addr, 0, + sin->sin_addr, lport, wild); + if (t && (reuseport & t->inp_socket->so_options) == 0) + return (EADDRINUSE); + } + inp->inp_laddr = sin->sin_addr; + } + if (lport == 0) + do { + if (head->inp_lport++ < IPPORT_RESERVED || + head->inp_lport > IPPORT_USERRESERVED) + head->inp_lport = IPPORT_RESERVED; + lport = htons(head->inp_lport); + } while (in_pcblookup(head, + zeroin_addr, 0, inp->inp_laddr, lport, wild)); + inp->inp_lport = lport; + return (0); +} + +/* + * Connect from a socket to a specified address. + * Both address and port must be specified in argument sin. + * If don't have a local address for this socket yet, + * then pick one. + */ +int +in_pcbconnect(inp, nam) + register struct inpcb *inp; + struct mbuf *nam; +{ + struct in_ifaddr *ia; + struct sockaddr_in *ifaddr; + register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); + + if (nam->m_len != sizeof (*sin)) + return (EINVAL); + if (sin->sin_family != AF_INET) + return (EAFNOSUPPORT); + if (sin->sin_port == 0) + return (EADDRNOTAVAIL); + if (in_ifaddr) { + /* + * If the destination address is INADDR_ANY, + * use the primary local address. + * If the supplied address is INADDR_BROADCAST, + * and the primary interface supports broadcast, + * choose the broadcast address for that interface. + */ +#define satosin(sa) ((struct sockaddr_in *)(sa)) +#define sintosa(sin) ((struct sockaddr *)(sin)) +#define ifatoia(ifa) ((struct in_ifaddr *)(ifa)) + if (sin->sin_addr.s_addr == INADDR_ANY) + sin->sin_addr = IA_SIN(in_ifaddr)->sin_addr; + else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST && + (in_ifaddr->ia_ifp->if_flags & IFF_BROADCAST)) + sin->sin_addr = satosin(&in_ifaddr->ia_broadaddr)->sin_addr; + } + if (inp->inp_laddr.s_addr == INADDR_ANY) { + register struct route *ro; + + ia = (struct in_ifaddr *)0; + /* + * If route is known or can be allocated now, + * our src addr is taken from the i/f, else punt. + */ + ro = &inp->inp_route; + if (ro->ro_rt && + (satosin(&ro->ro_dst)->sin_addr.s_addr != + sin->sin_addr.s_addr || + inp->inp_socket->so_options & SO_DONTROUTE)) { + RTFREE(ro->ro_rt); + ro->ro_rt = (struct rtentry *)0; + } + if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/ + (ro->ro_rt == (struct rtentry *)0 || + ro->ro_rt->rt_ifp == (struct ifnet *)0)) { + /* No route yet, so try to acquire one */ + ro->ro_dst.sa_family = AF_INET; + ro->ro_dst.sa_len = sizeof(struct sockaddr_in); + ((struct sockaddr_in *) &ro->ro_dst)->sin_addr = + sin->sin_addr; + rtalloc(ro); + } + /* + * If we found a route, use the address + * corresponding to the outgoing interface + * unless it is the loopback (in case a route + * to our address on another net goes to loopback). + */ + if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) + ia = ifatoia(ro->ro_rt->rt_ifa); + if (ia == 0) { + u_short fport = sin->sin_port; + + sin->sin_port = 0; + ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin))); + if (ia == 0) + ia = ifatoia(ifa_ifwithnet(sintosa(sin))); + sin->sin_port = fport; + if (ia == 0) + ia = in_ifaddr; + if (ia == 0) + return (EADDRNOTAVAIL); + } + /* + * If the destination address is multicast and an outgoing + * interface has been set as a multicast option, use the + * address of that interface as our source address. + */ + if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) && + inp->inp_moptions != NULL) { + struct ip_moptions *imo; + struct ifnet *ifp; + + imo = inp->inp_moptions; + if (imo->imo_multicast_ifp != NULL) { + ifp = imo->imo_multicast_ifp; + for (ia = in_ifaddr; ia; ia = ia->ia_next) + if (ia->ia_ifp == ifp) + break; + if (ia == 0) + return (EADDRNOTAVAIL); + } + } + ifaddr = (struct sockaddr_in *)&ia->ia_addr; + } + if (in_pcblookup(inp->inp_head, + sin->sin_addr, + sin->sin_port, + inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr, + inp->inp_lport, + 0)) + return (EADDRINUSE); + if (inp->inp_laddr.s_addr == INADDR_ANY) { + if (inp->inp_lport == 0) + (void)in_pcbbind(inp, (struct mbuf *)0); + inp->inp_laddr = ifaddr->sin_addr; + } + inp->inp_faddr = sin->sin_addr; + inp->inp_fport = sin->sin_port; + return (0); +} + +int +in_pcbdisconnect(inp) + struct inpcb *inp; +{ + + inp->inp_faddr.s_addr = INADDR_ANY; + inp->inp_fport = 0; + if (inp->inp_socket->so_state & SS_NOFDREF) + in_pcbdetach(inp); +} + +int +in_pcbdetach(inp) + struct inpcb *inp; +{ + struct socket *so = inp->inp_socket; + + so->so_pcb = 0; + sofree(so); + if (inp->inp_options) + (void)m_free(inp->inp_options); + if (inp->inp_route.ro_rt) + rtfree(inp->inp_route.ro_rt); + ip_freemoptions(inp->inp_moptions); + remque(inp); + FREE(inp, M_PCB); +} + +int +in_setsockaddr(inp, nam) + register struct inpcb *inp; + struct mbuf *nam; +{ + register struct sockaddr_in *sin; + + nam->m_len = sizeof (*sin); + sin = mtod(nam, struct sockaddr_in *); + bzero((caddr_t)sin, sizeof (*sin)); + sin->sin_family = AF_INET; + sin->sin_len = sizeof(*sin); + sin->sin_port = inp->inp_lport; + sin->sin_addr = inp->inp_laddr; +} + +int +in_setpeeraddr(inp, nam) + struct inpcb *inp; + struct mbuf *nam; +{ + register struct sockaddr_in *sin; + + nam->m_len = sizeof (*sin); + sin = mtod(nam, struct sockaddr_in *); + bzero((caddr_t)sin, sizeof (*sin)); + sin->sin_family = AF_INET; + sin->sin_len = sizeof(*sin); + sin->sin_port = inp->inp_fport; + sin->sin_addr = inp->inp_faddr; +} + +/* + * Pass some notification to all connections of a protocol + * associated with address dst. The local address and/or port numbers + * may be specified to limit the search. The "usual action" will be + * taken, depending on the ctlinput cmd. The caller must filter any + * cmds that are uninteresting (e.g., no error in the map). + * Call the protocol specific routine (if any) to report + * any errors for each matching socket. + * + * Must be called at splnet. + */ +int +in_pcbnotify(head, dst, fport_arg, laddr, lport_arg, cmd, notify) + struct inpcb *head; + struct sockaddr *dst; + u_int fport_arg, lport_arg; + struct in_addr laddr; + int cmd; + void (*notify) __P((struct inpcb *, int)); +{ + extern u_char inetctlerrmap[]; + register struct inpcb *inp, *oinp; + struct in_addr faddr; + u_short fport = fport_arg, lport = lport_arg; + int errno; + + if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET) + return; + faddr = ((struct sockaddr_in *)dst)->sin_addr; + if (faddr.s_addr == INADDR_ANY) + return; + + /* + * Redirects go to all references to the destination, + * and use in_rtchange to invalidate the route cache. + * Dead host indications: notify all references to the destination. + * Otherwise, if we have knowledge of the local port and address, + * deliver only to that socket. + */ + if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { + fport = 0; + lport = 0; + laddr.s_addr = 0; + if (cmd != PRC_HOSTDEAD) + notify = in_rtchange; + } + errno = inetctlerrmap[cmd]; + for (inp = head->inp_next; inp != head;) { + if (inp->inp_faddr.s_addr != faddr.s_addr || + inp->inp_socket == 0 || + (lport && inp->inp_lport != lport) || + (laddr.s_addr && inp->inp_laddr.s_addr != laddr.s_addr) || + (fport && inp->inp_fport != fport)) { + inp = inp->inp_next; + continue; + } + oinp = inp; + inp = inp->inp_next; + if (notify) + (*notify)(oinp, errno); + } +} + +/* + * Check for alternatives when higher level complains + * about service problems. For now, invalidate cached + * routing information. If the route was created dynamically + * (by a redirect), time to try a default gateway again. + */ +int +in_losing(inp) + struct inpcb *inp; +{ + register struct rtentry *rt; + struct rt_addrinfo info; + + if ((rt = inp->inp_route.ro_rt)) { + inp->inp_route.ro_rt = 0; + bzero((caddr_t)&info, sizeof(info)); + info.rti_info[RTAX_DST] = + (struct sockaddr *)&inp->inp_route.ro_dst; + info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; + info.rti_info[RTAX_NETMASK] = rt_mask(rt); + rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); + if (rt->rt_flags & RTF_DYNAMIC) + (void) rtrequest(RTM_DELETE, rt_key(rt), + rt->rt_gateway, rt_mask(rt), rt->rt_flags, + (struct rtentry **)0); + else + /* + * A new route can be allocated + * the next time output is attempted. + */ + rtfree(rt); + } +} + +/* + * After a routing change, flush old routing + * and allocate a (hopefully) better one. + */ +void +in_rtchange(inp, errno) + register struct inpcb *inp; + int errno; +{ + if (inp->inp_route.ro_rt) { + rtfree(inp->inp_route.ro_rt); + inp->inp_route.ro_rt = 0; + /* + * A new route can be allocated the next time + * output is attempted. + */ + } +} + +struct inpcb * +in_pcblookup(head, faddr, fport_arg, laddr, lport_arg, flags) + struct inpcb *head; + struct in_addr faddr, laddr; + u_int fport_arg, lport_arg; + int flags; +{ + register struct inpcb *inp, *match = 0; + int matchwild = 3, wildcard; + u_short fport = fport_arg, lport = lport_arg; + + for (inp = head->inp_next; inp != head; inp = inp->inp_next) { + if (inp->inp_lport != lport) + continue; + wildcard = 0; + if (inp->inp_laddr.s_addr != INADDR_ANY) { + if (laddr.s_addr == INADDR_ANY) + wildcard++; + else if (inp->inp_laddr.s_addr != laddr.s_addr) + continue; + } else { + if (laddr.s_addr != INADDR_ANY) + wildcard++; + } + if (inp->inp_faddr.s_addr != INADDR_ANY) { + if (faddr.s_addr == INADDR_ANY) + wildcard++; + else if (inp->inp_faddr.s_addr != faddr.s_addr || + inp->inp_fport != fport) + continue; + } else { + if (faddr.s_addr != INADDR_ANY) + wildcard++; + } + if (wildcard && (flags & INPLOOKUP_WILDCARD) == 0) + continue; + if (wildcard < matchwild) { + match = inp; + matchwild = wildcard; + if (matchwild == 0) + break; + } + } + return (match); +} |