version 1.1, 1993/03/21 09:45:37 |
version 1.10, 1994/01/10 20:14:34 |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
* SUCH DAMAGE. |
* SUCH DAMAGE. |
* |
* |
* @(#)udp_usrreq.c 7.20 (Berkeley) 4/20/91 |
* from: @(#)udp_usrreq.c 7.20 (Berkeley) 4/20/91 |
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* $Id$ |
*/ |
*/ |
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#include "param.h" |
#include <sys/param.h> |
#include "malloc.h" |
#include <sys/malloc.h> |
#include "mbuf.h" |
#include <sys/mbuf.h> |
#include "protosw.h" |
#include <sys/protosw.h> |
#include "socket.h" |
#include <sys/socket.h> |
#include "socketvar.h" |
#include <sys/socketvar.h> |
#include "stat.h" |
#include <sys/stat.h> |
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#include "../net/if.h" |
#include <net/if.h> |
#include "../net/route.h" |
#include <net/route.h> |
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#include "in.h" |
#include <netinet/in.h> |
#include "in_systm.h" |
#include <netinet/in_systm.h> |
#include "ip.h" |
#include <netinet/ip.h> |
#include "in_pcb.h" |
#include <netinet/in_pcb.h> |
#include "ip_var.h" |
#include <netinet/ip_var.h> |
#include "ip_icmp.h" |
#include <netinet/ip_icmp.h> |
#include "udp.h" |
#include <netinet/udp.h> |
#include "udp_var.h" |
#include <netinet/udp_var.h> |
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struct inpcb *udp_last_inpcb = &udb; |
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/* |
/* |
* UDP protocol implementation. |
* UDP protocol implementation. |
* Per RFC 768, August, 1980. |
* Per RFC 768, August, 1980. |
*/ |
*/ |
udp_init() |
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{ |
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udb.inp_next = udb.inp_prev = &udb; |
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} |
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#ifndef COMPAT_42 |
#ifndef COMPAT_42 |
int udpcksum = 1; |
int udpcksum = 1; |
#else |
#else |
Line 73 int udpcksum = 0; /* XXX */ |
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Line 66 int udpcksum = 0; /* XXX */ |
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int udp_ttl = UDP_TTL; |
int udp_ttl = UDP_TTL; |
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struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET }; |
struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET }; |
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struct inpcb *udp_last_inpcb = &udb; |
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static void udp_detach __P((struct inpcb *)); |
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static void udp_notify __P((struct inpcb *, int)); |
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static struct mbuf * |
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udp_saveopt __P((caddr_t, int, int)); |
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void |
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udp_init() |
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{ |
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udb.inp_next = udb.inp_prev = &udb; |
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} |
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void |
udp_input(m, iphlen) |
udp_input(m, iphlen) |
register struct mbuf *m; |
register struct mbuf *m; |
int iphlen; |
int iphlen; |
Line 144 udp_input(m, iphlen) |
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Line 151 udp_input(m, iphlen) |
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return; |
return; |
} |
} |
} |
} |
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#ifdef MULTICAST |
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if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || |
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in_broadcast(ip->ip_dst)) { |
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struct socket *last; |
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/* |
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* Deliver a multicast or broadcast datagram to *all* sockets |
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* for which the local and remote addresses and ports match |
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* those of the incoming datagram. This allows more than |
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* one process to receive multi/broadcasts on the same port. |
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* (This really ought to be done for unicast datagrams as |
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* well, but that would cause problems with existing |
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* applications that open both address-specific sockets and |
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* a wildcard socket listening to the same port -- they would |
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* end up receiving duplicates of every unicast datagram. |
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* Those applications open the multiple sockets to overcome an |
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* inadequacy of the UDP socket interface, but for backwards |
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* compatibility we avoid the problem here rather than |
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* fixing the interface. Maybe 4.4BSD will remedy this?) |
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*/ |
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/* |
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* Construct sockaddr format source address. |
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*/ |
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udp_in.sin_port = uh->uh_sport; |
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udp_in.sin_addr = ip->ip_src; |
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m->m_len -= sizeof (struct udpiphdr); |
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m->m_data += sizeof (struct udpiphdr); |
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/* |
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* Locate pcb(s) for datagram. |
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* (Algorithm copied from raw_intr().) |
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*/ |
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last = NULL; |
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for (inp = udb.inp_next; inp != &udb; inp = inp->inp_next) { |
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if (inp->inp_lport != uh->uh_dport) |
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continue; |
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if (inp->inp_laddr.s_addr != INADDR_ANY) { |
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if (inp->inp_laddr.s_addr != |
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ip->ip_dst.s_addr) |
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continue; |
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} |
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if (inp->inp_faddr.s_addr != INADDR_ANY) { |
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if (inp->inp_faddr.s_addr != |
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ip->ip_src.s_addr || |
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inp->inp_fport != uh->uh_sport) |
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continue; |
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} |
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if (last != NULL) { |
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struct mbuf *n; |
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if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { |
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if (sbappendaddr(&last->so_rcv, |
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(struct sockaddr *)&udp_in, |
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n, (struct mbuf *)0) == 0) |
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m_freem(n); |
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else |
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sorwakeup(last); |
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} |
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} |
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last = inp->inp_socket; |
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/* |
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* Don't look for additional matches if this one |
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* does not have the SO_REUSEADDR socket option set. |
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* This heuristic avoids searching through all pcbs |
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* in the common case of a non-shared port. It |
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* assumes that an application will never clear |
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* the SO_REUSEADDR option after setting it. |
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*/ |
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if ((last->so_options & SO_REUSEADDR) == 0) |
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break; |
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} |
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if (last == NULL) { |
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/* |
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* No matching pcb found; discard datagram. |
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* (No need to send an ICMP Port Unreachable |
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* for a broadcast or multicast datgram.) |
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*/ |
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goto bad; |
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} |
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if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&udp_in, |
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m, (struct mbuf *)0) == 0) |
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goto bad; |
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sorwakeup(last); |
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return; |
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} |
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#endif |
/* |
/* |
* Locate pcb for datagram. |
* Locate pcb for datagram. |
*/ |
*/ |
Line 162 udp_input(m, iphlen) |
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Line 254 udp_input(m, iphlen) |
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if (inp == 0) { |
if (inp == 0) { |
/* don't send ICMP response for broadcast packet */ |
/* don't send ICMP response for broadcast packet */ |
udpstat.udps_noport++; |
udpstat.udps_noport++; |
if (m->m_flags & M_BCAST) { |
#ifndef MULTICAST |
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/* XXX why don't we do this with MULTICAST? */ |
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if (m->m_flags & (M_BCAST | M_MCAST)) { |
udpstat.udps_noportbcast++; |
udpstat.udps_noportbcast++; |
goto bad; |
goto bad; |
} |
} |
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#endif |
*ip = save_ip; |
*ip = save_ip; |
ip->ip_len += iphlen; |
ip->ip_len += iphlen; |
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT); |
{ |
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register struct in_addr foo = {}; |
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icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, foo); |
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} |
return; |
return; |
} |
} |
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Line 180 udp_input(m, iphlen) |
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Line 278 udp_input(m, iphlen) |
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udp_in.sin_addr = ip->ip_src; |
udp_in.sin_addr = ip->ip_src; |
if (inp->inp_flags & INP_CONTROLOPTS) { |
if (inp->inp_flags & INP_CONTROLOPTS) { |
struct mbuf **mp = &opts; |
struct mbuf **mp = &opts; |
struct mbuf *udp_saveopt(); |
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if (inp->inp_flags & INP_RECVDSTADDR) { |
if (inp->inp_flags & INP_RECVDSTADDR) { |
*mp = udp_saveopt((caddr_t) &ip->ip_dst, |
*mp = udp_saveopt((caddr_t) &ip->ip_dst, |
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* Create a "control" mbuf containing the specified data |
* Create a "control" mbuf containing the specified data |
* with the specified type for presentation with a datagram. |
* with the specified type for presentation with a datagram. |
*/ |
*/ |
struct mbuf * |
static struct mbuf * |
udp_saveopt(p, size, type) |
udp_saveopt(p, size, type) |
caddr_t p; |
caddr_t p; |
register int size; |
register int size; |
Line 251 udp_saveopt(p, size, type) |
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Line 348 udp_saveopt(p, size, type) |
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* Notify a udp user of an asynchronous error; |
* Notify a udp user of an asynchronous error; |
* just wake up so that he can collect error status. |
* just wake up so that he can collect error status. |
*/ |
*/ |
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static void |
udp_notify(inp, errno) |
udp_notify(inp, errno) |
register struct inpcb *inp; |
register struct inpcb *inp; |
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int errno; |
{ |
{ |
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inp->inp_socket->so_error = errno; |
inp->inp_socket->so_error = errno; |
Line 260 udp_notify(inp, errno) |
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Line 359 udp_notify(inp, errno) |
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sowwakeup(inp->inp_socket); |
sowwakeup(inp->inp_socket); |
} |
} |
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void |
udp_ctlinput(cmd, sa, ip) |
udp_ctlinput(cmd, sa, ip) |
int cmd; |
int cmd; |
struct sockaddr *sa; |
struct sockaddr *sa; |
Line 279 udp_ctlinput(cmd, sa, ip) |
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Line 379 udp_ctlinput(cmd, sa, ip) |
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in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify); |
in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify); |
} |
} |
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int |
udp_output(inp, m, addr, control) |
udp_output(inp, m, addr, control) |
register struct inpcb *inp; |
register struct inpcb *inp; |
register struct mbuf *m; |
register struct mbuf *m; |
Line 347 udp_output(inp, m, addr, control) |
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Line 448 udp_output(inp, m, addr, control) |
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((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ |
((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ |
udpstat.udps_opackets++; |
udpstat.udps_opackets++; |
error = ip_output(m, inp->inp_options, &inp->inp_route, |
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) |
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#ifdef MULTICAST |
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, inp->inp_moptions |
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#else |
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, NULL |
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#endif |
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); |
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if (addr) { |
if (addr) { |
in_pcbdisconnect(inp); |
in_pcbdisconnect(inp); |
Line 366 u_long udp_recvspace = 40 * (1024 + size |
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Line 473 u_long udp_recvspace = 40 * (1024 + size |
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/* 40 1K datagrams */ |
/* 40 1K datagrams */ |
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/*ARGSUSED*/ |
/*ARGSUSED*/ |
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int |
udp_usrreq(so, req, m, addr, control) |
udp_usrreq(so, req, m, addr, control) |
struct socket *so; |
struct socket *so; |
int req; |
int req; |
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return (error); |
return (error); |
} |
} |
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static void |
udp_detach(inp) |
udp_detach(inp) |
struct inpcb *inp; |
struct inpcb *inp; |
{ |
{ |