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"
22 #include "rx_atomic.h"
23 #include "rx_globals.h"
26 #include "rx_packet.h"
27 #include "rx_internal.h"
28 #include <asm/uaccess.h>
30 #include <linux/errqueue.h>
31 #include <linux/icmp.h>
34 #include "osi_compat.h"
37 * open and bind RX socket
40 rxk_NewSocketHost(afs_uint32 ahost, short aport)
43 struct sockaddr_in myaddr;
46 int pmtu = IP_PMTUDISC_WANT;
48 int pmtu = IP_PMTUDISC_DONT;
51 #ifdef HAVE_LINUX_SOCK_CREATE_KERN
52 code = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sockp);
53 #elif defined(LINUX_KERNEL_SOCK_CREATE_V)
54 code = sock_create(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sockp, 0);
56 code = sock_create(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sockp);
62 myaddr.sin_family = AF_INET;
63 myaddr.sin_addr.s_addr = ahost;
64 myaddr.sin_port = aport;
66 sockp->ops->bind(sockp, (struct sockaddr *)&myaddr, sizeof(myaddr));
69 printk("sock_release(rx_socket) FIXME\n");
73 kernel_setsockopt(sockp, SOL_IP, IP_MTU_DISCOVER, (char *)&pmtu,
78 kernel_setsockopt(sockp, SOL_IP, IP_RECVERR, (char *)&recverr,
82 return (osi_socket *)sockp;
86 rxk_NewSocket(short aport)
88 return rxk_NewSocketHost(htonl(INADDR_ANY), aport);
91 /* free socket allocated by osi_NetSocket */
93 rxk_FreeSocket(struct socket *asocket)
95 AFS_STATCNT(osi_FreeSocket);
101 osi_HandleSocketError(osi_socket so, char *cmsgbuf, size_t cmsgbuf_len)
104 struct cmsghdr *cmsg;
105 struct sock_extended_err *err;
106 struct sockaddr_in addr;
108 struct socket *sop = (struct socket *)so;
110 msg.msg_name = &addr;
111 msg.msg_namelen = sizeof(addr);
112 msg.msg_control = cmsgbuf;
113 msg.msg_controllen = cmsgbuf_len;
116 code = kernel_recvmsg(sop, &msg, NULL, 0, 0,
117 MSG_ERRQUEUE|MSG_DONTWAIT|MSG_TRUNC);
119 if (code < 0 || !(msg.msg_flags & MSG_ERRQUEUE))
122 /* kernel_recvmsg changes msg_control to point at the _end_ of the buffer,
123 * and msg_controllen is set to the number of bytes remaining */
124 msg.msg_controllen = ((char*)msg.msg_control - (char*)cmsgbuf);
125 msg.msg_control = cmsgbuf;
127 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg && CMSG_OK(&msg, cmsg);
128 cmsg = CMSG_NXTHDR(&msg, cmsg)) {
130 if (cmsg->cmsg_level != SOL_IP || cmsg->cmsg_type != IP_RECVERR) {
134 err = CMSG_DATA(cmsg);
135 rxi_ProcessNetError(err, addr.sin_addr.s_addr, addr.sin_port);
143 do_handlesocketerror(osi_socket so)
145 #ifdef AFS_RXERRQ_ENV
150 cmsgbuf = rxi_Alloc(cmsgbuf_len);
155 while (osi_HandleSocketError(so, cmsgbuf, cmsgbuf_len))
158 rxi_Free(cmsgbuf, cmsgbuf_len);
169 osi_NetSend(osi_socket sop, struct sockaddr_in *to, struct iovec *iovec,
170 int iovcnt, afs_int32 size, int istack)
177 msg.msg_namelen = sizeof(*to);
178 msg.msg_control = NULL;
179 msg.msg_controllen = 0;
182 code = kernel_sendmsg(sop, &msg, (struct kvec *) iovec, iovcnt, size);
185 do_handlesocketerror(sop);
188 return (code < 0) ? code : 0;
193 * OS dependent part of kernel RX listener thread.
196 * so socket to receive on, typically rx_socket
197 * from pointer to a sockaddr_in.
198 * iov array of iovecs to fill in.
199 * iovcnt how many iovecs there are.
200 * lengthp IN/OUT in: total space available in iovecs. out: size of read.
204 * error code (such as EINTER) if not
207 * Note that the maximum number of iovecs is 2 + RX_MAXWVECS. This is
208 * so we have a little space to look for packets larger than
211 int rxk_lastSocketError;
212 int rxk_nSocketErrors;
214 osi_NetReceive(osi_socket so, struct sockaddr_in *from, struct iovec *iov,
215 int iovcnt, int *lengthp)
219 struct iovec tmpvec[RX_MAXWVECS + 2];
220 struct socket *sop = (struct socket *)so;
222 if (iovcnt > RX_MAXWVECS + 2) {
223 osi_Panic("Too many (%d) iovecs passed to osi_NetReceive\n", iovcnt);
226 memcpy(tmpvec, iov, iovcnt * sizeof(struct iovec));
228 #if defined(STRUCT_MSGHDR_HAS_MSG_ITER)
229 msg.msg_iter.iov = tmpvec;
230 msg.msg_iter.nr_segs = iovcnt;
232 msg.msg_iov = tmpvec;
233 msg.msg_iovlen = iovcnt;
235 msg.msg_control = NULL;
236 msg.msg_controllen = 0;
239 code = kernel_recvmsg(sop, &msg, (struct kvec *)tmpvec, iovcnt,
244 /* Clear the error before using the socket again.
245 * Oh joy, Linux has hidden header files as well. It appears we can
246 * simply call again and have it clear itself via sock_error().
248 flush_signals(current); /* We don't want no stinkin' signals. */
249 rxk_lastSocketError = code;
252 do_handlesocketerror(so);
262 osi_StopListener(void)
264 extern struct task_struct *rxk_ListenerTask;
266 while (rxk_ListenerTask) {
267 if (rxk_ListenerTask) {
268 flush_signals(rxk_ListenerTask);
269 force_sig(SIGKILL, rxk_ListenerTask);
271 if (!rxk_ListenerTask)
273 afs_osi_Sleep(&rxk_ListenerTask);
275 sock_release(rx_socket);