--- /dev/null
+/*
+ * Copyright 2000, International Business Machines Corporation and others.
+ * All Rights Reserved.
+ *
+ * This software has been released under the terms of the IBM Public
+ * License. For details, see the LICENSE file in the top-level source
+ * directory or online at http://www.openafs.org/dl/license10.html
+ */
+
+/*
+ * rx_knet.c - RX kernel send, receive and timer routines.
+ *
+ * Linux implementation.
+ */
+#include <afsconfig.h>
+#include "afs/param.h"
+
+
+#include <linux/version.h>
+#ifdef AFS_LINUX22_ENV
+#include "rx/rx_kcommon.h"
+#if defined(AFS_LINUX24_ENV)
+#include "h/smp_lock.h"
+#endif
+#include <asm/uaccess.h>
+#ifdef ADAPT_PMTU
+#include <linux/errqueue.h>
+#include <linux/icmp.h>
+#endif
+
+/* rxk_NewSocket
+ * open and bind RX socket
+ */
+osi_socket *
+rxk_NewSocketHost(afs_uint32 ahost, short aport)
+{
+ struct socket *sockp;
+ struct sockaddr_in myaddr;
+ int code;
+ KERNEL_SPACE_DECL;
+#ifdef ADAPT_PMTU
+ int pmtu = IP_PMTUDISC_WANT;
+ int do_recverr = 1;
+#else
+ int pmtu = IP_PMTUDISC_DONT;
+#endif
+
+ /* We need a better test for this. if you need it back, tell us
+ * how to detect it.
+ */
+#ifdef LINUX_KERNEL_SOCK_CREATE_V
+ code = sock_create(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sockp, 0);
+#else
+ code = sock_create(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sockp);
+#endif
+ if (code < 0)
+ return NULL;
+
+ /* Bind socket */
+ myaddr.sin_family = AF_INET;
+ myaddr.sin_addr.s_addr = ahost;
+ myaddr.sin_port = aport;
+ code =
+ sockp->ops->bind(sockp, (struct sockaddr *)&myaddr, sizeof(myaddr));
+
+ if (code < 0) {
+#if defined(AFS_LINUX24_ENV)
+ printk("sock_release(rx_socket) FIXME\n");
+#else
+ sock_release(sockp);
+#endif
+ return NULL;
+ }
+
+ TO_USER_SPACE();
+ sockp->ops->setsockopt(sockp, SOL_IP, IP_MTU_DISCOVER, (char *)&pmtu,
+ sizeof(pmtu));
+#ifdef ADAPT_PMTU
+ sockp->ops->setsockopt(sockp, SOL_IP, IP_RECVERR, (char *)&do_recverr,
+ sizeof(do_recverr));
+#endif
+ TO_KERNEL_SPACE();
+ return (osi_socket *)sockp;
+}
+
+osi_socket *
+rxk_NewSocket(short aport)
+{
+ return rxk_NewSocketHost(htonl(INADDR_ANY), aport);
+}
+
+/* free socket allocated by osi_NetSocket */
+int
+rxk_FreeSocket(register struct socket *asocket)
+{
+ AFS_STATCNT(osi_FreeSocket);
+ return 0;
+}
+
+#ifdef ADAPT_PMTU
+void
+handle_socket_error(osi_socket so)
+{
+ KERNEL_SPACE_DECL;
+ struct msghdr msg;
+ struct cmsghdr *cmsg;
+ struct sock_extended_err *err;
+ struct sockaddr_in addr;
+ struct sockaddr *offender;
+ char *controlmsgbuf;
+ int code;
+ struct socket *sop = (struct socket *)so;
+
+ if (!(controlmsgbuf=rxi_Alloc(256)))
+ return;
+ msg.msg_name = &addr;
+ msg.msg_namelen = sizeof(addr);
+ msg.msg_iov = NULL;
+ msg.msg_iovlen = 0;
+ msg.msg_control = controlmsgbuf;
+ msg.msg_controllen = 256;
+ msg.msg_flags = 0;
+
+ TO_USER_SPACE();
+ code = sock_recvmsg(sop, &msg, 256, MSG_ERRQUEUE|MSG_DONTWAIT|MSG_TRUNC);
+ TO_KERNEL_SPACE();
+
+ if (code < 0 || !(msg.msg_flags & MSG_ERRQUEUE))
+ goto out;
+
+ for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
+ if (CMSG_OK(&msg, cmsg) && cmsg->cmsg_level == SOL_IP &&
+ cmsg->cmsg_type == IP_RECVERR)
+ break;
+ }
+ if (!cmsg)
+ goto out;
+ err = CMSG_DATA(cmsg);
+ offender = SO_EE_OFFENDER(err);
+
+ if (offender->sa_family != AF_INET)
+ goto out;
+
+ memcpy(&addr, offender, sizeof(addr));
+
+ if (err->ee_origin == SO_EE_ORIGIN_ICMP &&
+ err->ee_type == ICMP_DEST_UNREACH &&
+ err->ee_code == ICMP_FRAG_NEEDED) {
+ rxi_SetPeerMtu(ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port),
+ err->ee_info);
+ }
+ /* other DEST_UNREACH's and TIME_EXCEEDED should be dealt with too */
+
+out:
+ rxi_Free(controlmsgbuf, 256);
+ return;
+}
+#endif
+
+/* osi_NetSend
+ *
+ * Return codes:
+ * 0 = success
+ * non-zero = failure
+ */
+int
+osi_NetSend(osi_socket sop, struct sockaddr_in *to, struct iovec *iovec,
+ int iovcnt, afs_int32 size, int istack)
+{
+ KERNEL_SPACE_DECL;
+ struct msghdr msg;
+ int code;
+#ifdef ADAPT_PMTU
+ int sockerr;
+ size_t esize;
+
+ while (1) {
+ sockerr=0;
+ esize = sizeof(sockerr);
+ TO_USER_SPACE();
+ sop->ops->getsockopt(sop, SOL_SOCKET, SO_ERROR, (char *)&sockerr,
+ &esize);
+ TO_KERNEL_SPACE();
+ if (sockerr == 0)
+ break;
+ handle_socket_error(sop);
+ }
+#endif
+
+ msg.msg_iovlen = iovcnt;
+ msg.msg_iov = iovec;
+ msg.msg_name = to;
+ msg.msg_namelen = sizeof(*to);
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ TO_USER_SPACE();
+ code = sock_sendmsg(sop, &msg, size);
+ TO_KERNEL_SPACE();
+ return (code < 0) ? code : 0;
+}
+
+
+/* osi_NetReceive
+ * OS dependent part of kernel RX listener thread.
+ *
+ * Arguments:
+ * so socket to receive on, typically rx_socket
+ * from pointer to a sockaddr_in.
+ * iov array of iovecs to fill in.
+ * iovcnt how many iovecs there are.
+ * lengthp IN/OUT in: total space available in iovecs. out: size of read.
+ *
+ * Return
+ * 0 if successful
+ * error code (such as EINTER) if not
+ *
+ * Environment
+ * Note that the maximum number of iovecs is 2 + RX_MAXWVECS. This is
+ * so we have a little space to look for packets larger than
+ * rx_maxReceiveSize.
+ */
+int rxk_lastSocketError;
+int rxk_nSocketErrors;
+int
+osi_NetReceive(osi_socket so, struct sockaddr_in *from, struct iovec *iov,
+ int iovcnt, int *lengthp)
+{
+ KERNEL_SPACE_DECL;
+ struct msghdr msg;
+ int code;
+#ifdef ADAPT_PMTU
+ int sockerr;
+ size_t esize;
+#endif
+ struct iovec tmpvec[RX_MAXWVECS + 2];
+ struct socket *sop = (struct socket *)so;
+
+ if (iovcnt > RX_MAXWVECS + 2) {
+ osi_Panic("Too many (%d) iovecs passed to osi_NetReceive\n", iovcnt);
+ }
+#ifdef ADAPT_PMTU
+ while (1) {
+ sockerr=0;
+ esize = sizeof(sockerr);
+ TO_USER_SPACE();
+ sop->ops->getsockopt(sop, SOL_SOCKET, SO_ERROR, (char *)&sockerr,
+ &esize);
+ TO_KERNEL_SPACE();
+ if (sockerr == 0)
+ break;
+ handle_socket_error(so);
+ }
+#endif
+ memcpy(tmpvec, iov, iovcnt * sizeof(struct iovec));
+ msg.msg_name = from;
+ msg.msg_iov = tmpvec;
+ msg.msg_iovlen = iovcnt;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ TO_USER_SPACE();
+ code = sock_recvmsg(sop, &msg, *lengthp, 0);
+ TO_KERNEL_SPACE();
+
+ if (code < 0) {
+ /* Clear the error before using the socket again.
+ * Oh joy, Linux has hidden header files as well. It appears we can
+ * simply call again and have it clear itself via sock_error().
+ */
+#ifdef AFS_LINUX22_ENV
+ flush_signals(current); /* We don't want no stinkin' signals. */
+#else
+ current->signal = 0; /* We don't want no stinkin' signals. */
+#endif
+ rxk_lastSocketError = code;
+ rxk_nSocketErrors++;
+ } else {
+ *lengthp = code;
+ code = 0;
+ }
+
+ return code;
+}
+#ifdef EXPORTED_TASKLIST_LOCK
+extern rwlock_t tasklist_lock __attribute__((weak));
+#endif
+void
+osi_StopListener(void)
+{
+ extern struct task_struct *rxk_ListenerTask;
+
+ while (rxk_ListenerTask) {
+ if (rxk_ListenerTask) {
+ flush_signals(rxk_ListenerTask);
+ force_sig(SIGKILL, rxk_ListenerTask);
+ }
+ if (!rxk_ListenerTask)
+ break;
+ afs_osi_Sleep(&rxk_ListenerTask);
+ }
+ sock_release(rx_socket);
+ rx_socket = NULL;
+}
+
+#endif /* AFS_LINUX22_ENV */
git://git.openafs.org / openafs.git / blobdiff