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 #if defined(HAVE_LINUX_UACCESS_H)
29 #include <linux/uaccess.h>
31 #include <asm/uaccess.h>
34 #include <linux/errqueue.h>
35 #include <linux/icmp.h>
38 #include "osi_compat.h"
41 * open and bind RX socket
44 rxk_NewSocketHost(afs_uint32 ahost, short aport)
47 struct sockaddr_in myaddr;
50 int pmtu = IP_PMTUDISC_WANT;
52 int pmtu = IP_PMTUDISC_DONT;
55 #ifdef HAVE_LINUX_SOCK_CREATE_KERN_NS
56 code = sock_create_kern(&init_net, AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sockp);
57 #elif defined(HAVE_LINUX_SOCK_CREATE_KERN)
58 code = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sockp);
59 #elif defined(LINUX_KERNEL_SOCK_CREATE_V)
60 code = sock_create(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sockp, 0);
62 code = sock_create(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sockp);
68 myaddr.sin_family = AF_INET;
69 myaddr.sin_addr.s_addr = ahost;
70 myaddr.sin_port = aport;
72 sockp->ops->bind(sockp, (struct sockaddr *)&myaddr, sizeof(myaddr));
75 printk("sock_release(rx_socket) FIXME\n");
79 kernel_setsockopt(sockp, SOL_IP, IP_MTU_DISCOVER, (char *)&pmtu,
84 kernel_setsockopt(sockp, SOL_IP, IP_RECVERR, (char *)&recverr,
88 return (osi_socket *)sockp;
92 rxk_NewSocket(short aport)
94 return rxk_NewSocketHost(htonl(INADDR_ANY), aport);
97 /* free socket allocated by osi_NetSocket */
99 rxk_FreeSocket(struct socket *asocket)
101 AFS_STATCNT(osi_FreeSocket);
105 #ifdef AFS_RXERRQ_ENV
107 osi_HandleSocketError(osi_socket so, char *cmsgbuf, size_t cmsgbuf_len)
110 struct cmsghdr *cmsg;
111 struct sock_extended_err *err;
112 struct sockaddr_in addr;
114 struct socket *sop = (struct socket *)so;
116 msg.msg_name = &addr;
117 msg.msg_namelen = sizeof(addr);
118 msg.msg_control = cmsgbuf;
119 msg.msg_controllen = cmsgbuf_len;
122 code = kernel_recvmsg(sop, &msg, NULL, 0, 0,
123 MSG_ERRQUEUE|MSG_DONTWAIT|MSG_TRUNC);
125 if (code < 0 || !(msg.msg_flags & MSG_ERRQUEUE))
128 /* kernel_recvmsg changes msg_control to point at the _end_ of the buffer,
129 * and msg_controllen is set to the number of bytes remaining */
130 msg.msg_controllen = ((char*)msg.msg_control - (char*)cmsgbuf);
131 msg.msg_control = cmsgbuf;
133 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg && CMSG_OK(&msg, cmsg);
134 cmsg = CMSG_NXTHDR(&msg, cmsg)) {
136 if (cmsg->cmsg_level != SOL_IP || cmsg->cmsg_type != IP_RECVERR) {
140 err = CMSG_DATA(cmsg);
141 rxi_ProcessNetError(err, addr.sin_addr.s_addr, addr.sin_port);
149 do_handlesocketerror(osi_socket so)
151 #ifdef AFS_RXERRQ_ENV
156 cmsgbuf = rxi_Alloc(cmsgbuf_len);
161 while (osi_HandleSocketError(so, cmsgbuf, cmsgbuf_len))
164 rxi_Free(cmsgbuf, cmsgbuf_len);
175 osi_NetSend(osi_socket sop, struct sockaddr_in *to, struct iovec *iovec,
176 int iovcnt, afs_int32 size, int istack)
183 msg.msg_namelen = sizeof(*to);
184 msg.msg_control = NULL;
185 msg.msg_controllen = 0;
188 code = kernel_sendmsg(sop, &msg, (struct kvec *) iovec, iovcnt, size);
191 do_handlesocketerror(sop);
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)
225 struct iovec tmpvec[RX_MAXWVECS + 2];
226 struct socket *sop = (struct socket *)so;
228 if (iovcnt > RX_MAXWVECS + 2) {
229 osi_Panic("Too many (%d) iovecs passed to osi_NetReceive\n", iovcnt);
232 memcpy(tmpvec, iov, iovcnt * sizeof(struct iovec));
234 #if defined(STRUCT_MSGHDR_HAS_MSG_ITER)
235 msg.msg_iter.iov = tmpvec;
236 msg.msg_iter.nr_segs = iovcnt;
238 msg.msg_iov = tmpvec;
239 msg.msg_iovlen = iovcnt;
241 msg.msg_control = NULL;
242 msg.msg_controllen = 0;
245 code = kernel_recvmsg(sop, &msg, (struct kvec *)tmpvec, iovcnt,
250 /* Clear the error before using the socket again.
251 * Oh joy, Linux has hidden header files as well. It appears we can
252 * simply call again and have it clear itself via sock_error().
254 flush_signals(current); /* We don't want no stinkin' signals. */
255 rxk_lastSocketError = code;
258 do_handlesocketerror(so);
268 osi_StopListener(void)
270 extern struct task_struct *rxk_ListenerTask;
272 while (rxk_ListenerTask) {
273 if (rxk_ListenerTask) {
274 flush_signals(rxk_ListenerTask);
275 force_sig(SIGKILL, rxk_ListenerTask);
277 if (!rxk_ListenerTask)
279 afs_osi_Sleep(&rxk_ListenerTask);
281 sock_release(rx_socket);