Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files. =================================================================== RCS file: /ftp/cvs/cvsroot/src/sys/netinet/udp_usrreq.c,v rcsdiff: /ftp/cvs/cvsroot/src/sys/netinet/udp_usrreq.c,v: warning: Unknown phrases like `commitid ...;' are present. retrieving revision 1.3 retrieving revision 1.18 diff -u -p -r1.3 -r1.18 --- src/sys/netinet/udp_usrreq.c 1993/05/22 11:42:52 1.3 +++ src/sys/netinet/udp_usrreq.c 1995/06/12 00:48:06 1.18 @@ -1,6 +1,8 @@ +/* $NetBSD: udp_usrreq.c,v 1.18 1995/06/12 00:48:06 mycroft Exp $ */ + /* - * Copyright (c) 1982, 1986, 1988, 1990 Regents of the University of California. - * All rights reserved. + * Copyright (c) 1982, 1986, 1988, 1990, 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 @@ -30,51 +32,56 @@ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * from: @(#)udp_usrreq.c 7.20 (Berkeley) 4/20/91 - * $Id: udp_usrreq.c,v 1.3 1993/05/22 11:42:52 cgd Exp $ + * @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94 */ -#include "param.h" -#include "malloc.h" -#include "mbuf.h" -#include "protosw.h" -#include "socket.h" -#include "socketvar.h" -#include "stat.h" - -#include "../net/if.h" -#include "../net/route.h" - -#include "in.h" -#include "in_systm.h" -#include "ip.h" -#include "in_pcb.h" -#include "ip_var.h" -#include "ip_icmp.h" -#include "udp.h" -#include "udp_var.h" - -struct inpcb *udp_last_inpcb = &udb; +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include /* * UDP protocol implementation. * Per RFC 768, August, 1980. */ -udp_init() -{ - - udb.inp_next = udb.inp_prev = &udb; -} - #ifndef COMPAT_42 int udpcksum = 1; #else int udpcksum = 0; /* XXX */ #endif -int udp_ttl = UDP_TTL; struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET }; +struct inpcb *udp_last_inpcb = 0; + +static void udp_detach __P((struct inpcb *)); +static void udp_notify __P((struct inpcb *, int)); +static struct mbuf *udp_saveopt __P((caddr_t, int, int)); + +void +udp_init() +{ + in_pcbinit(&udbtable); +} + +void udp_input(m, iphlen) register struct mbuf *m; int iphlen; @@ -116,7 +123,7 @@ udp_input(m, iphlen) * Make mbuf data length reflect UDP length. * If not enough data to reflect UDP length, drop. */ - len = ntohs((u_short)uh->uh_ulen); + len = ntohs((u_int16_t)uh->uh_ulen); if (ip->ip_len != len) { if (len > ip->ip_len) { udpstat.udps_badlen++; @@ -146,31 +153,120 @@ udp_input(m, iphlen) } } + if (IN_MULTICAST(ip->ip_dst.s_addr) || + in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { + struct socket *last; + /* + * Deliver a multicast or broadcast datagram to *all* sockets + * for which the local and remote addresses and ports match + * those of the incoming datagram. This allows more than + * one process to receive multi/broadcasts on the same port. + * (This really ought to be done for unicast datagrams as + * well, but that would cause problems with existing + * applications that open both address-specific sockets and + * a wildcard socket listening to the same port -- they would + * end up receiving duplicates of every unicast datagram. + * Those applications open the multiple sockets to overcome an + * inadequacy of the UDP socket interface, but for backwards + * compatibility we avoid the problem here rather than + * fixing the interface. Maybe 4.5BSD will remedy this?) + */ + + /* + * Construct sockaddr format source address. + */ + udp_in.sin_port = uh->uh_sport; + udp_in.sin_addr = ip->ip_src; + m->m_len -= sizeof (struct udpiphdr); + m->m_data += sizeof (struct udpiphdr); + /* + * Locate pcb(s) for datagram. + * (Algorithm copied from raw_intr().) + */ + last = NULL; + for (inp = udbtable.inpt_list.lh_first; inp != 0; + inp = inp->inp_list.le_next) { + if (inp->inp_lport != uh->uh_dport) + continue; + if (inp->inp_laddr.s_addr != INADDR_ANY) { + if (inp->inp_laddr.s_addr != + ip->ip_dst.s_addr) + continue; + } + if (inp->inp_faddr.s_addr != INADDR_ANY) { + if (inp->inp_faddr.s_addr != + ip->ip_src.s_addr || + inp->inp_fport != uh->uh_sport) + continue; + } + + if (last != NULL) { + struct mbuf *n; + + if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { + if (sbappendaddr(&last->so_rcv, + sintosa(&udp_in), n, + (struct mbuf *)0) == 0) { + m_freem(n); + udpstat.udps_fullsock++; + } else + sorwakeup(last); + } + } + last = inp->inp_socket; + /* + * Don't look for additional matches if this one does + * not have either the SO_REUSEPORT or SO_REUSEADDR + * socket options set. This heuristic avoids searching + * through all pcbs in the common case of a non-shared + * port. It * assumes that an application will never + * clear these options after setting them. + */ + if ((last->so_options&(SO_REUSEPORT|SO_REUSEADDR) == 0)) + break; + } + + if (last == NULL) { + /* + * No matching pcb found; discard datagram. + * (No need to send an ICMP Port Unreachable + * for a broadcast or multicast datgram.) + */ + udpstat.udps_noportbcast++; + goto bad; + } + if (sbappendaddr(&last->so_rcv, sintosa(&udp_in), m, + (struct mbuf *)0) == 0) { + udpstat.udps_fullsock++; + goto bad; + } + sorwakeup(last); + return; + } /* * Locate pcb for datagram. */ inp = udp_last_inpcb; - if (inp->inp_lport != uh->uh_dport || + if (inp == 0 || + inp->inp_lport != uh->uh_dport || inp->inp_fport != uh->uh_sport || inp->inp_faddr.s_addr != ip->ip_src.s_addr || inp->inp_laddr.s_addr != ip->ip_dst.s_addr) { - inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport, - ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD); - if (inp) - udp_last_inpcb = inp; udpstat.udpps_pcbcachemiss++; - } - if (inp == 0) { - /* don't send ICMP response for broadcast packet */ - udpstat.udps_noport++; - if (m->m_flags & M_BCAST) { - udpstat.udps_noportbcast++; - goto bad; + inp = in_pcblookup(&udbtable, ip->ip_src, uh->uh_sport, + ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD); + if (inp == 0) { + udpstat.udps_noport++; + if (m->m_flags & (M_BCAST | M_MCAST)) { + udpstat.udps_noportbcast++; + goto bad; + } + *ip = save_ip; + ip->ip_len += iphlen; + icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); + return; } - *ip = save_ip; - ip->ip_len += iphlen; - icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT); - return; + udp_last_inpcb = inp; } /* @@ -181,7 +277,6 @@ udp_input(m, iphlen) udp_in.sin_addr = ip->ip_src; if (inp->inp_flags & INP_CONTROLOPTS) { struct mbuf **mp = &opts; - struct mbuf *udp_saveopt(); if (inp->inp_flags & INP_RECVDSTADDR) { *mp = udp_saveopt((caddr_t) &ip->ip_dst, @@ -210,8 +305,8 @@ udp_input(m, iphlen) m->m_len -= iphlen; m->m_pkthdr.len -= iphlen; m->m_data += iphlen; - if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in, - m, opts) == 0) { + if (sbappendaddr(&inp->inp_socket->so_rcv, sintosa(&udp_in), m, + opts) == 0) { udpstat.udps_fullsock++; goto bad; } @@ -239,7 +334,7 @@ udp_saveopt(p, size, type) if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL) return ((struct mbuf *) NULL); cp = (struct cmsghdr *) mtod(m, struct cmsghdr *); - bcopy(p, (caddr_t)(cp + 1), size); + bcopy(p, CMSG_DATA(cp), size); size += sizeof(*cp); m->m_len = size; cp->cmsg_len = size; @@ -252,15 +347,17 @@ udp_saveopt(p, size, type) * Notify a udp user of an asynchronous error; * just wake up so that he can collect error status. */ +static void udp_notify(inp, errno) register struct inpcb *inp; + int errno; { - inp->inp_socket->so_error = errno; sorwakeup(inp->inp_socket); sowwakeup(inp->inp_socket); } +void udp_ctlinput(cmd, sa, ip) int cmd; struct sockaddr *sa; @@ -269,17 +366,24 @@ udp_ctlinput(cmd, sa, ip) register struct udphdr *uh; extern struct in_addr zeroin_addr; extern u_char inetctlerrmap[]; + void (*notify) __P((struct inpcb *, int)) = udp_notify; - if ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0) + if (PRC_IS_REDIRECT(cmd)) + notify = in_rtchange; + else if (cmd == PRC_HOSTDEAD) + ; + else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) return; - if (ip) { + else if (ip) { uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); - in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport, - cmd, udp_notify); - } else - in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify); + in_pcbnotify(&udbtable, sa, uh->uh_dport, ip->ip_src, + uh->uh_sport, cmd, notify); + return; + } + in_pcbnotifyall(&udbtable, sa, cmd, notify); } +int udp_output(inp, m, addr, control) register struct inpcb *inp; register struct mbuf *m; @@ -318,7 +422,11 @@ udp_output(inp, m, addr, control) * Calculate data length and get a mbuf * for UDP and IP headers. */ - M_PREPEND(m, sizeof(struct udpiphdr), M_WAIT); + M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); + if (m == 0) { + error = ENOBUFS; + goto release; + } /* * Fill in mbuf with extended UDP header @@ -328,7 +436,7 @@ udp_output(inp, m, addr, control) ui->ui_next = ui->ui_prev = 0; ui->ui_x1 = 0; ui->ui_pr = IPPROTO_UDP; - ui->ui_len = htons((u_short)len + sizeof (struct udphdr)); + ui->ui_len = htons((u_int16_t)len + sizeof (struct udphdr)); ui->ui_src = inp->inp_laddr; ui->ui_dst = inp->inp_faddr; ui->ui_sport = inp->inp_lport; @@ -348,7 +456,8 @@ udp_output(inp, m, addr, control) ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ udpstat.udps_opackets++; error = ip_output(m, inp->inp_options, &inp->inp_route, - inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)); + inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), + inp->inp_moptions); if (addr) { in_pcbdisconnect(inp); @@ -367,6 +476,7 @@ u_long udp_recvspace = 40 * (1024 + size /* 40 1K datagrams */ /*ARGSUSED*/ +int udp_usrreq(so, req, m, addr, control) struct socket *so; int req; @@ -377,7 +487,7 @@ udp_usrreq(so, req, m, addr, control) int s; if (req == PRU_CONTROL) - return (in_control(so, (int)m, (caddr_t)addr, + return (in_control(so, (long)m, (caddr_t)addr, (struct ifnet *)control)); if (inp == NULL && req != PRU_ATTACH) { error = EINVAL; @@ -395,14 +505,14 @@ udp_usrreq(so, req, m, addr, control) break; } s = splnet(); - error = in_pcballoc(so, &udb); + error = in_pcballoc(so, &udbtable); splx(s); if (error) break; error = soreserve(so, udp_sendspace, udp_recvspace); if (error) break; - ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = udp_ttl; + ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = ip_defttl; break; case PRU_DETACH: @@ -503,13 +613,38 @@ release: return (error); } +static void udp_detach(inp) struct inpcb *inp; { int s = splnet(); if (inp == udp_last_inpcb) - udp_last_inpcb = &udb; + udp_last_inpcb = 0; in_pcbdetach(inp); splx(s); } + +/* + * Sysctl for udp variables. + */ +udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen) + int *name; + u_int namelen; + void *oldp; + size_t *oldlenp; + void *newp; + size_t newlen; +{ + /* All sysctl names at this level are terminal. */ + if (namelen != 1) + return (ENOTDIR); + + switch (name[0]) { + case UDPCTL_CHECKSUM: + return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum)); + default: + return (ENOPROTOOPT); + } + /* NOTREACHED */ +}