2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
11 * rx_knet.c - RX kernel send, receive and timer routines.
13 * Linux implementation.
15 #include <afsconfig.h>
16 #include "afs/param.h"
19 #include <linux/version.h>
20 #include "rx/rx_kcommon.h"
21 #include "h/smp_lock.h"
22 #include <asm/uaccess.h>
24 #include <linux/errqueue.h>
25 #include <linux/icmp.h>
29 * open and bind RX socket
32 rxk_NewSocketHost(afs_uint32 ahost, short aport)
35 struct sockaddr_in myaddr;
39 int pmtu = IP_PMTUDISC_WANT;
42 int pmtu = IP_PMTUDISC_DONT;
45 /* We need a better test for this. if you need it back, tell us
48 #ifdef LINUX_KERNEL_SOCK_CREATE_V
49 code = sock_create(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sockp, 0);
51 code = sock_create(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sockp);
57 myaddr.sin_family = AF_INET;
58 myaddr.sin_addr.s_addr = ahost;
59 myaddr.sin_port = aport;
61 sockp->ops->bind(sockp, (struct sockaddr *)&myaddr, sizeof(myaddr));
64 printk("sock_release(rx_socket) FIXME\n");
69 sockp->ops->setsockopt(sockp, SOL_IP, IP_MTU_DISCOVER, (char *)&pmtu,
72 sockp->ops->setsockopt(sockp, SOL_IP, IP_RECVERR, (char *)&do_recverr,
76 return (osi_socket *)sockp;
80 rxk_NewSocket(short aport)
82 return rxk_NewSocketHost(htonl(INADDR_ANY), aport);
85 /* free socket allocated by osi_NetSocket */
87 rxk_FreeSocket(struct socket *asocket)
89 AFS_STATCNT(osi_FreeSocket);
95 handle_socket_error(osi_socket so)
100 struct sock_extended_err *err;
101 struct sockaddr_in addr;
102 struct sockaddr *offender;
105 struct socket *sop = (struct socket *)so;
107 if (!(controlmsgbuf=rxi_Alloc(256)))
109 msg.msg_name = &addr;
110 msg.msg_namelen = sizeof(addr);
113 msg.msg_control = controlmsgbuf;
114 msg.msg_controllen = 256;
118 code = sock_recvmsg(sop, &msg, 256, MSG_ERRQUEUE|MSG_DONTWAIT|MSG_TRUNC);
121 if (code < 0 || !(msg.msg_flags & MSG_ERRQUEUE))
124 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
125 if (CMSG_OK(&msg, cmsg) && cmsg->cmsg_level == SOL_IP &&
126 cmsg->cmsg_type == IP_RECVERR)
131 err = CMSG_DATA(cmsg);
132 offender = SO_EE_OFFENDER(err);
134 if (offender->sa_family != AF_INET)
137 memcpy(&addr, offender, sizeof(addr));
139 if (err->ee_origin == SO_EE_ORIGIN_ICMP &&
140 err->ee_type == ICMP_DEST_UNREACH &&
141 err->ee_code == ICMP_FRAG_NEEDED) {
142 rxi_SetPeerMtu(ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port),
145 /* other DEST_UNREACH's and TIME_EXCEEDED should be dealt with too */
148 rxi_Free(controlmsgbuf, 256);
160 osi_NetSend(osi_socket sop, struct sockaddr_in *to, struct iovec *iovec,
161 int iovcnt, afs_int32 size, int istack)
172 esize = sizeof(sockerr);
174 sop->ops->getsockopt(sop, SOL_SOCKET, SO_ERROR, (char *)&sockerr,
179 handle_socket_error(sop);
183 msg.msg_iovlen = iovcnt;
186 msg.msg_namelen = sizeof(*to);
187 msg.msg_control = NULL;
188 msg.msg_controllen = 0;
192 code = sock_sendmsg(sop, &msg, size);
194 return (code < 0) ? code : 0;
199 * OS dependent part of kernel RX listener thread.
202 * so socket to receive on, typically rx_socket
203 * from pointer to a sockaddr_in.
204 * iov array of iovecs to fill in.
205 * iovcnt how many iovecs there are.
206 * lengthp IN/OUT in: total space available in iovecs. out: size of read.
210 * error code (such as EINTER) if not
213 * Note that the maximum number of iovecs is 2 + RX_MAXWVECS. This is
214 * so we have a little space to look for packets larger than
217 int rxk_lastSocketError;
218 int rxk_nSocketErrors;
220 osi_NetReceive(osi_socket so, struct sockaddr_in *from, struct iovec *iov,
221 int iovcnt, int *lengthp)
230 struct iovec tmpvec[RX_MAXWVECS + 2];
231 struct socket *sop = (struct socket *)so;
233 if (iovcnt > RX_MAXWVECS + 2) {
234 osi_Panic("Too many (%d) iovecs passed to osi_NetReceive\n", iovcnt);
239 esize = sizeof(sockerr);
241 sop->ops->getsockopt(sop, SOL_SOCKET, SO_ERROR, (char *)&sockerr,
246 handle_socket_error(so);
249 memcpy(tmpvec, iov, iovcnt * sizeof(struct iovec));
251 msg.msg_iov = tmpvec;
252 msg.msg_iovlen = iovcnt;
253 msg.msg_control = NULL;
254 msg.msg_controllen = 0;
258 code = sock_recvmsg(sop, &msg, *lengthp, 0);
265 current->flags & PF_FREEZE
267 # if defined(STRUCT_TASK_STRUCT_HAS_TODO)
270 # if defined(STRUCT_TASK_STRUCT_HAS_THREAD_INFO)
271 test_ti_thread_flag(current->thread_info, TIF_FREEZE)
273 test_ti_thread_flag(task_thread_info(current), TIF_FREEZE)
278 # ifdef LINUX_REFRIGERATOR_TAKES_PF_FREEZE
279 refrigerator(PF_FREEZE);
283 set_current_state(TASK_INTERRUPTIBLE);
286 /* Clear the error before using the socket again.
287 * Oh joy, Linux has hidden header files as well. It appears we can
288 * simply call again and have it clear itself via sock_error().
290 flush_signals(current); /* We don't want no stinkin' signals. */
291 rxk_lastSocketError = code;
302 osi_StopListener(void)
304 extern struct task_struct *rxk_ListenerTask;
306 while (rxk_ListenerTask) {
307 if (rxk_ListenerTask) {
308 flush_signals(rxk_ListenerTask);
309 force_sig(SIGKILL, rxk_ListenerTask);
311 if (!rxk_ListenerTask)
313 afs_osi_Sleep(&rxk_ListenerTask);
315 sock_release(rx_socket);