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-rw-r--r--net/rxrpc/transport.c854
1 files changed, 854 insertions, 0 deletions
diff --git a/net/rxrpc/transport.c b/net/rxrpc/transport.c
new file mode 100644
index 000000000000..9bce7794130a
--- /dev/null
+++ b/net/rxrpc/transport.c
@@ -0,0 +1,854 @@
+/* transport.c: Rx Transport routines
+ *
+ * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <rxrpc/transport.h>
+#include <rxrpc/peer.h>
+#include <rxrpc/connection.h>
+#include <rxrpc/call.h>
+#include <rxrpc/message.h>
+#include <rxrpc/krxiod.h>
+#include <rxrpc/krxsecd.h>
+#include <linux/udp.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/icmp.h>
+#include <net/sock.h>
+#include <net/ip.h>
+#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
+#include <linux/ipv6.h> /* this should _really_ be in errqueue.h.. */
+#endif
+#include <linux/errqueue.h>
+#include <asm/uaccess.h>
+#include <asm/checksum.h>
+#include "internal.h"
+
+struct errormsg {
+ struct cmsghdr cmsg; /* control message header */
+ struct sock_extended_err ee; /* extended error information */
+ struct sockaddr_in icmp_src; /* ICMP packet source address */
+};
+
+static DEFINE_SPINLOCK(rxrpc_transports_lock);
+static struct list_head rxrpc_transports = LIST_HEAD_INIT(rxrpc_transports);
+
+__RXACCT_DECL(atomic_t rxrpc_transport_count);
+LIST_HEAD(rxrpc_proc_transports);
+DECLARE_RWSEM(rxrpc_proc_transports_sem);
+
+static void rxrpc_data_ready(struct sock *sk, int count);
+static void rxrpc_error_report(struct sock *sk);
+static int rxrpc_trans_receive_new_call(struct rxrpc_transport *trans,
+ struct list_head *msgq);
+static void rxrpc_trans_receive_error_report(struct rxrpc_transport *trans);
+
+/*****************************************************************************/
+/*
+ * create a new transport endpoint using the specified UDP port
+ */
+int rxrpc_create_transport(unsigned short port,
+ struct rxrpc_transport **_trans)
+{
+ struct rxrpc_transport *trans;
+ struct sockaddr_in sin;
+ mm_segment_t oldfs;
+ struct sock *sock;
+ int ret, opt;
+
+ _enter("%hu", port);
+
+ trans = kmalloc(sizeof(struct rxrpc_transport), GFP_KERNEL);
+ if (!trans)
+ return -ENOMEM;
+
+ memset(trans, 0, sizeof(struct rxrpc_transport));
+ atomic_set(&trans->usage, 1);
+ INIT_LIST_HEAD(&trans->services);
+ INIT_LIST_HEAD(&trans->link);
+ INIT_LIST_HEAD(&trans->krxiodq_link);
+ spin_lock_init(&trans->lock);
+ INIT_LIST_HEAD(&trans->peer_active);
+ INIT_LIST_HEAD(&trans->peer_graveyard);
+ spin_lock_init(&trans->peer_gylock);
+ init_waitqueue_head(&trans->peer_gy_waitq);
+ rwlock_init(&trans->peer_lock);
+ atomic_set(&trans->peer_count, 0);
+ trans->port = port;
+
+ /* create a UDP socket to be my actual transport endpoint */
+ ret = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &trans->socket);
+ if (ret < 0)
+ goto error;
+
+ /* use the specified port */
+ if (port) {
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_family = AF_INET;
+ sin.sin_port = htons(port);
+ ret = trans->socket->ops->bind(trans->socket,
+ (struct sockaddr *) &sin,
+ sizeof(sin));
+ if (ret < 0)
+ goto error;
+ }
+
+ opt = 1;
+ oldfs = get_fs();
+ set_fs(KERNEL_DS);
+ ret = trans->socket->ops->setsockopt(trans->socket, SOL_IP, IP_RECVERR,
+ (char *) &opt, sizeof(opt));
+ set_fs(oldfs);
+
+ spin_lock(&rxrpc_transports_lock);
+ list_add(&trans->link, &rxrpc_transports);
+ spin_unlock(&rxrpc_transports_lock);
+
+ /* set the socket up */
+ sock = trans->socket->sk;
+ sock->sk_user_data = trans;
+ sock->sk_data_ready = rxrpc_data_ready;
+ sock->sk_error_report = rxrpc_error_report;
+
+ down_write(&rxrpc_proc_transports_sem);
+ list_add_tail(&trans->proc_link, &rxrpc_proc_transports);
+ up_write(&rxrpc_proc_transports_sem);
+
+ __RXACCT(atomic_inc(&rxrpc_transport_count));
+
+ *_trans = trans;
+ _leave(" = 0 (%p)", trans);
+ return 0;
+
+ error:
+ /* finish cleaning up the transport (not really needed here, but...) */
+ if (trans->socket)
+ trans->socket->ops->shutdown(trans->socket, 2);
+
+ /* close the socket */
+ if (trans->socket) {
+ trans->socket->sk->sk_user_data = NULL;
+ sock_release(trans->socket);
+ trans->socket = NULL;
+ }
+
+ kfree(trans);
+
+
+ _leave(" = %d", ret);
+ return ret;
+} /* end rxrpc_create_transport() */
+
+/*****************************************************************************/
+/*
+ * destroy a transport endpoint
+ */
+void rxrpc_put_transport(struct rxrpc_transport *trans)
+{
+ _enter("%p{u=%d p=%hu}",
+ trans, atomic_read(&trans->usage), trans->port);
+
+ BUG_ON(atomic_read(&trans->usage) <= 0);
+
+ /* to prevent a race, the decrement and the dequeue must be
+ * effectively atomic */
+ spin_lock(&rxrpc_transports_lock);
+ if (likely(!atomic_dec_and_test(&trans->usage))) {
+ spin_unlock(&rxrpc_transports_lock);
+ _leave("");
+ return;
+ }
+
+ list_del(&trans->link);
+ spin_unlock(&rxrpc_transports_lock);
+
+ /* finish cleaning up the transport */
+ if (trans->socket)
+ trans->socket->ops->shutdown(trans->socket, 2);
+
+ rxrpc_krxsecd_clear_transport(trans);
+ rxrpc_krxiod_dequeue_transport(trans);
+
+ /* discard all peer information */
+ rxrpc_peer_clearall(trans);
+
+ down_write(&rxrpc_proc_transports_sem);
+ list_del(&trans->proc_link);
+ up_write(&rxrpc_proc_transports_sem);
+ __RXACCT(atomic_dec(&rxrpc_transport_count));
+
+ /* close the socket */
+ if (trans->socket) {
+ trans->socket->sk->sk_user_data = NULL;
+ sock_release(trans->socket);
+ trans->socket = NULL;
+ }
+
+ kfree(trans);
+
+ _leave("");
+} /* end rxrpc_put_transport() */
+
+/*****************************************************************************/
+/*
+ * add a service to a transport to be listened upon
+ */
+int rxrpc_add_service(struct rxrpc_transport *trans,
+ struct rxrpc_service *newsrv)
+{
+ struct rxrpc_service *srv;
+ struct list_head *_p;
+ int ret = -EEXIST;
+
+ _enter("%p{%hu},%p{%hu}",
+ trans, trans->port, newsrv, newsrv->service_id);
+
+ /* verify that the service ID is not already present */
+ spin_lock(&trans->lock);
+
+ list_for_each(_p, &trans->services) {
+ srv = list_entry(_p, struct rxrpc_service, link);
+ if (srv->service_id == newsrv->service_id)
+ goto out;
+ }
+
+ /* okay - add the transport to the list */
+ list_add_tail(&newsrv->link, &trans->services);
+ rxrpc_get_transport(trans);
+ ret = 0;
+
+ out:
+ spin_unlock(&trans->lock);
+
+ _leave("= %d", ret);
+ return ret;
+} /* end rxrpc_add_service() */
+
+/*****************************************************************************/
+/*
+ * remove a service from a transport
+ */
+void rxrpc_del_service(struct rxrpc_transport *trans, struct rxrpc_service *srv)
+{
+ _enter("%p{%hu},%p{%hu}", trans, trans->port, srv, srv->service_id);
+
+ spin_lock(&trans->lock);
+ list_del(&srv->link);
+ spin_unlock(&trans->lock);
+
+ rxrpc_put_transport(trans);
+
+ _leave("");
+} /* end rxrpc_del_service() */
+
+/*****************************************************************************/
+/*
+ * INET callback when data has been received on the socket.
+ */
+static void rxrpc_data_ready(struct sock *sk, int count)
+{
+ struct rxrpc_transport *trans;
+
+ _enter("%p{t=%p},%d", sk, sk->sk_user_data, count);
+
+ /* queue the transport for attention by krxiod */
+ trans = (struct rxrpc_transport *) sk->sk_user_data;
+ if (trans)
+ rxrpc_krxiod_queue_transport(trans);
+
+ /* wake up anyone waiting on the socket */
+ if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+ wake_up_interruptible(sk->sk_sleep);
+
+ _leave("");
+} /* end rxrpc_data_ready() */
+
+/*****************************************************************************/
+/*
+ * INET callback when an ICMP error packet is received
+ * - sk->err is error (EHOSTUNREACH, EPROTO or EMSGSIZE)
+ */
+static void rxrpc_error_report(struct sock *sk)
+{
+ struct rxrpc_transport *trans;
+
+ _enter("%p{t=%p}", sk, sk->sk_user_data);
+
+ /* queue the transport for attention by krxiod */
+ trans = (struct rxrpc_transport *) sk->sk_user_data;
+ if (trans) {
+ trans->error_rcvd = 1;
+ rxrpc_krxiod_queue_transport(trans);
+ }
+
+ /* wake up anyone waiting on the socket */
+ if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+ wake_up_interruptible(sk->sk_sleep);
+
+ _leave("");
+} /* end rxrpc_error_report() */
+
+/*****************************************************************************/
+/*
+ * split a message up, allocating message records and filling them in
+ * from the contents of a socket buffer
+ */
+static int rxrpc_incoming_msg(struct rxrpc_transport *trans,
+ struct sk_buff *pkt,
+ struct list_head *msgq)
+{
+ struct rxrpc_message *msg;
+ int ret;
+
+ _enter("");
+
+ msg = kmalloc(sizeof(struct rxrpc_message), GFP_KERNEL);
+ if (!msg) {
+ _leave(" = -ENOMEM");
+ return -ENOMEM;
+ }
+
+ memset(msg, 0, sizeof(*msg));
+ atomic_set(&msg->usage, 1);
+ list_add_tail(&msg->link,msgq);
+
+ /* dig out the Rx routing parameters */
+ if (skb_copy_bits(pkt, sizeof(struct udphdr),
+ &msg->hdr, sizeof(msg->hdr)) < 0) {
+ ret = -EBADMSG;
+ goto error;
+ }
+
+ msg->trans = trans;
+ msg->state = RXRPC_MSG_RECEIVED;
+ msg->stamp = pkt->stamp;
+ if (msg->stamp.tv_sec == 0) {
+ do_gettimeofday(&msg->stamp);
+ if (pkt->sk)
+ sock_enable_timestamp(pkt->sk);
+ }
+ msg->seq = ntohl(msg->hdr.seq);
+
+ /* attach the packet */
+ skb_get(pkt);
+ msg->pkt = pkt;
+
+ msg->offset = sizeof(struct udphdr) + sizeof(struct rxrpc_header);
+ msg->dsize = msg->pkt->len - msg->offset;
+
+ _net("Rx Received packet from %s (%08x;%08x,%1x,%d,%s,%02x,%d,%d)",
+ msg->hdr.flags & RXRPC_CLIENT_INITIATED ? "client" : "server",
+ ntohl(msg->hdr.epoch),
+ (ntohl(msg->hdr.cid) & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT,
+ ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK,
+ ntohl(msg->hdr.callNumber),
+ rxrpc_pkts[msg->hdr.type],
+ msg->hdr.flags,
+ ntohs(msg->hdr.serviceId),
+ msg->hdr.securityIndex);
+
+ __RXACCT(atomic_inc(&rxrpc_message_count));
+
+ /* split off jumbo packets */
+ while (msg->hdr.type == RXRPC_PACKET_TYPE_DATA &&
+ msg->hdr.flags & RXRPC_JUMBO_PACKET
+ ) {
+ struct rxrpc_jumbo_header jumbo;
+ struct rxrpc_message *jumbomsg = msg;
+
+ _debug("split jumbo packet");
+
+ /* quick sanity check */
+ ret = -EBADMSG;
+ if (msg->dsize <
+ RXRPC_JUMBO_DATALEN + sizeof(struct rxrpc_jumbo_header))
+ goto error;
+ if (msg->hdr.flags & RXRPC_LAST_PACKET)
+ goto error;
+
+ /* dig out the secondary header */
+ if (skb_copy_bits(pkt, msg->offset + RXRPC_JUMBO_DATALEN,
+ &jumbo, sizeof(jumbo)) < 0)
+ goto error;
+
+ /* allocate a new message record */
+ ret = -ENOMEM;
+ msg = kmalloc(sizeof(struct rxrpc_message), GFP_KERNEL);
+ if (!msg)
+ goto error;
+
+ memcpy(msg, jumbomsg, sizeof(*msg));
+ list_add_tail(&msg->link, msgq);
+
+ /* adjust the jumbo packet */
+ jumbomsg->dsize = RXRPC_JUMBO_DATALEN;
+
+ /* attach the packet here too */
+ skb_get(pkt);
+
+ /* adjust the parameters */
+ msg->seq++;
+ msg->hdr.seq = htonl(msg->seq);
+ msg->hdr.serial = htonl(ntohl(msg->hdr.serial) + 1);
+ msg->offset += RXRPC_JUMBO_DATALEN +
+ sizeof(struct rxrpc_jumbo_header);
+ msg->dsize -= RXRPC_JUMBO_DATALEN +
+ sizeof(struct rxrpc_jumbo_header);
+ msg->hdr.flags = jumbo.flags;
+ msg->hdr._rsvd = jumbo._rsvd;
+
+ _net("Rx Split jumbo packet from %s"
+ " (%08x;%08x,%1x,%d,%s,%02x,%d,%d)",
+ msg->hdr.flags & RXRPC_CLIENT_INITIATED ? "client" : "server",
+ ntohl(msg->hdr.epoch),
+ (ntohl(msg->hdr.cid) & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT,
+ ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK,
+ ntohl(msg->hdr.callNumber),
+ rxrpc_pkts[msg->hdr.type],
+ msg->hdr.flags,
+ ntohs(msg->hdr.serviceId),
+ msg->hdr.securityIndex);
+
+ __RXACCT(atomic_inc(&rxrpc_message_count));
+ }
+
+ _leave(" = 0 #%d", atomic_read(&rxrpc_message_count));
+ return 0;
+
+ error:
+ while (!list_empty(msgq)) {
+ msg = list_entry(msgq->next, struct rxrpc_message, link);
+ list_del_init(&msg->link);
+
+ rxrpc_put_message(msg);
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+} /* end rxrpc_incoming_msg() */
+
+/*****************************************************************************/
+/*
+ * accept a new call
+ * - called from krxiod in process context
+ */
+void rxrpc_trans_receive_packet(struct rxrpc_transport *trans)
+{
+ struct rxrpc_message *msg;
+ struct rxrpc_peer *peer;
+ struct sk_buff *pkt;
+ int ret;
+ __be32 addr;
+ __be16 port;
+
+ LIST_HEAD(msgq);
+
+ _enter("%p{%d}", trans, trans->port);
+
+ for (;;) {
+ /* deal with outstanting errors first */
+ if (trans->error_rcvd)
+ rxrpc_trans_receive_error_report(trans);
+
+ /* attempt to receive a packet */
+ pkt = skb_recv_datagram(trans->socket->sk, 0, 1, &ret);
+ if (!pkt) {
+ if (ret == -EAGAIN) {
+ _leave(" EAGAIN");
+ return;
+ }
+
+ /* an icmp error may have occurred */
+ rxrpc_krxiod_queue_transport(trans);
+ _leave(" error %d\n", ret);
+ return;
+ }
+
+ /* we'll probably need to checksum it (didn't call
+ * sock_recvmsg) */
+ if (pkt->ip_summed != CHECKSUM_UNNECESSARY) {
+ if ((unsigned short)
+ csum_fold(skb_checksum(pkt, 0, pkt->len,
+ pkt->csum))) {
+ kfree_skb(pkt);
+ rxrpc_krxiod_queue_transport(trans);
+ _leave(" CSUM failed");
+ return;
+ }
+ }
+
+ addr = pkt->nh.iph->saddr;
+ port = pkt->h.uh->source;
+
+ _net("Rx Received UDP packet from %08x:%04hu",
+ ntohl(addr), ntohs(port));
+
+ /* unmarshall the Rx parameters and split jumbo packets */
+ ret = rxrpc_incoming_msg(trans, pkt, &msgq);
+ if (ret < 0) {
+ kfree_skb(pkt);
+ rxrpc_krxiod_queue_transport(trans);
+ _leave(" bad packet");
+ return;
+ }
+
+ BUG_ON(list_empty(&msgq));
+
+ msg = list_entry(msgq.next, struct rxrpc_message, link);
+
+ /* locate the record for the peer from which it
+ * originated */
+ ret = rxrpc_peer_lookup(trans, addr, &peer);
+ if (ret < 0) {
+ kdebug("Rx No connections from that peer");
+ rxrpc_trans_immediate_abort(trans, msg, -EINVAL);
+ goto finished_msg;
+ }
+
+ /* try and find a matching connection */
+ ret = rxrpc_connection_lookup(peer, msg, &msg->conn);
+ if (ret < 0) {
+ kdebug("Rx Unknown Connection");
+ rxrpc_trans_immediate_abort(trans, msg, -EINVAL);
+ rxrpc_put_peer(peer);
+ goto finished_msg;
+ }
+ rxrpc_put_peer(peer);
+
+ /* deal with the first packet of a new call */
+ if (msg->hdr.flags & RXRPC_CLIENT_INITIATED &&
+ msg->hdr.type == RXRPC_PACKET_TYPE_DATA &&
+ ntohl(msg->hdr.seq) == 1
+ ) {
+ _debug("Rx New server call");
+ rxrpc_trans_receive_new_call(trans, &msgq);
+ goto finished_msg;
+ }
+
+ /* deal with subsequent packet(s) of call */
+ _debug("Rx Call packet");
+ while (!list_empty(&msgq)) {
+ msg = list_entry(msgq.next, struct rxrpc_message, link);
+ list_del_init(&msg->link);
+
+ ret = rxrpc_conn_receive_call_packet(msg->conn, NULL, msg);
+ if (ret < 0) {
+ rxrpc_trans_immediate_abort(trans, msg, ret);
+ rxrpc_put_message(msg);
+ goto finished_msg;
+ }
+
+ rxrpc_put_message(msg);
+ }
+
+ goto finished_msg;
+
+ /* dispose of the packets */
+ finished_msg:
+ while (!list_empty(&msgq)) {
+ msg = list_entry(msgq.next, struct rxrpc_message, link);
+ list_del_init(&msg->link);
+
+ rxrpc_put_message(msg);
+ }
+ kfree_skb(pkt);
+ }
+
+ _leave("");
+
+} /* end rxrpc_trans_receive_packet() */
+
+/*****************************************************************************/
+/*
+ * accept a new call from a client trying to connect to one of my services
+ * - called in process context
+ */
+static int rxrpc_trans_receive_new_call(struct rxrpc_transport *trans,
+ struct list_head *msgq)
+{
+ struct rxrpc_message *msg;
+
+ _enter("");
+
+ /* only bother with the first packet */
+ msg = list_entry(msgq->next, struct rxrpc_message, link);
+ list_del_init(&msg->link);
+ rxrpc_krxsecd_queue_incoming_call(msg);
+ rxrpc_put_message(msg);
+
+ _leave(" = 0");
+
+ return 0;
+} /* end rxrpc_trans_receive_new_call() */
+
+/*****************************************************************************/
+/*
+ * perform an immediate abort without connection or call structures
+ */
+int rxrpc_trans_immediate_abort(struct rxrpc_transport *trans,
+ struct rxrpc_message *msg,
+ int error)
+{
+ struct rxrpc_header ahdr;
+ struct sockaddr_in sin;
+ struct msghdr msghdr;
+ struct kvec iov[2];
+ __be32 _error;
+ int len, ret;
+
+ _enter("%p,%p,%d", trans, msg, error);
+
+ /* don't abort an abort packet */
+ if (msg->hdr.type == RXRPC_PACKET_TYPE_ABORT) {
+ _leave(" = 0");
+ return 0;
+ }
+
+ _error = htonl(-error);
+
+ /* set up the message to be transmitted */
+ memcpy(&ahdr, &msg->hdr, sizeof(ahdr));
+ ahdr.epoch = msg->hdr.epoch;
+ ahdr.serial = htonl(1);
+ ahdr.seq = 0;
+ ahdr.type = RXRPC_PACKET_TYPE_ABORT;
+ ahdr.flags = RXRPC_LAST_PACKET;
+ ahdr.flags |= ~msg->hdr.flags & RXRPC_CLIENT_INITIATED;
+
+ iov[0].iov_len = sizeof(ahdr);
+ iov[0].iov_base = &ahdr;
+ iov[1].iov_len = sizeof(_error);
+ iov[1].iov_base = &_error;
+
+ len = sizeof(ahdr) + sizeof(_error);
+
+ memset(&sin,0,sizeof(sin));
+ sin.sin_family = AF_INET;
+ sin.sin_port = msg->pkt->h.uh->source;
+ sin.sin_addr.s_addr = msg->pkt->nh.iph->saddr;
+
+ msghdr.msg_name = &sin;
+ msghdr.msg_namelen = sizeof(sin);
+ msghdr.msg_control = NULL;
+ msghdr.msg_controllen = 0;
+ msghdr.msg_flags = MSG_DONTWAIT;
+
+ _net("Sending message type %d of %d bytes to %08x:%d",
+ ahdr.type,
+ len,
+ ntohl(sin.sin_addr.s_addr),
+ ntohs(sin.sin_port));
+
+ /* send the message */
+ ret = kernel_sendmsg(trans->socket, &msghdr, iov, 2, len);
+
+ _leave(" = %d", ret);
+ return ret;
+} /* end rxrpc_trans_immediate_abort() */
+
+/*****************************************************************************/
+/*
+ * receive an ICMP error report and percolate it to all connections
+ * heading to the affected host or port
+ */
+static void rxrpc_trans_receive_error_report(struct rxrpc_transport *trans)
+{
+ struct rxrpc_connection *conn;
+ struct sockaddr_in sin;
+ struct rxrpc_peer *peer;
+ struct list_head connq, *_p;
+ struct errormsg emsg;
+ struct msghdr msg;
+ __be16 port;
+ int local, err;
+
+ _enter("%p", trans);
+
+ for (;;) {
+ trans->error_rcvd = 0;
+
+ /* try and receive an error message */
+ msg.msg_name = &sin;
+ msg.msg_namelen = sizeof(sin);
+ msg.msg_control = &emsg;
+ msg.msg_controllen = sizeof(emsg);
+ msg.msg_flags = 0;
+
+ err = kernel_recvmsg(trans->socket, &msg, NULL, 0, 0,
+ MSG_ERRQUEUE | MSG_DONTWAIT | MSG_TRUNC);
+
+ if (err == -EAGAIN) {
+ _leave("");
+ return;
+ }
+
+ if (err < 0) {
+ printk("%s: unable to recv an error report: %d\n",
+ __FUNCTION__, err);
+ _leave("");
+ return;
+ }
+
+ msg.msg_controllen = (char *) msg.msg_control - (char *) &emsg;
+
+ if (msg.msg_controllen < sizeof(emsg.cmsg) ||
+ msg.msg_namelen < sizeof(sin)) {
+ printk("%s: short control message"
+ " (nlen=%u clen=%Zu fl=%x)\n",
+ __FUNCTION__,
+ msg.msg_namelen,
+ msg.msg_controllen,
+ msg.msg_flags);
+ continue;
+ }
+
+ _net("Rx Received control message"
+ " { len=%Zu level=%u type=%u }",
+ emsg.cmsg.cmsg_len,
+ emsg.cmsg.cmsg_level,
+ emsg.cmsg.cmsg_type);
+
+ if (sin.sin_family != AF_INET) {
+ printk("Rx Ignoring error report with non-INET address"
+ " (fam=%u)",
+ sin.sin_family);
+ continue;
+ }
+
+ _net("Rx Received message pertaining to host addr=%x port=%hu",
+ ntohl(sin.sin_addr.s_addr), ntohs(sin.sin_port));
+
+ if (emsg.cmsg.cmsg_level != SOL_IP ||
+ emsg.cmsg.cmsg_type != IP_RECVERR) {
+ printk("Rx Ignoring unknown error report"
+ " { level=%u type=%u }",
+ emsg.cmsg.cmsg_level,
+ emsg.cmsg.cmsg_type);
+ continue;
+ }
+
+ if (msg.msg_controllen < sizeof(emsg.cmsg) + sizeof(emsg.ee)) {
+ printk("%s: short error message (%Zu)\n",
+ __FUNCTION__, msg.msg_controllen);
+ _leave("");
+ return;
+ }
+
+ port = sin.sin_port;
+
+ switch (emsg.ee.ee_origin) {
+ case SO_EE_ORIGIN_ICMP:
+ local = 0;
+ switch (emsg.ee.ee_type) {
+ case ICMP_DEST_UNREACH:
+ switch (emsg.ee.ee_code) {
+ case ICMP_NET_UNREACH:
+ _net("Rx Received ICMP Network Unreachable");
+ port = 0;
+ err = -ENETUNREACH;
+ break;
+ case ICMP_HOST_UNREACH:
+ _net("Rx Received ICMP Host Unreachable");
+ port = 0;
+ err = -EHOSTUNREACH;
+ break;
+ case ICMP_PORT_UNREACH:
+ _net("Rx Received ICMP Port Unreachable");
+ err = -ECONNREFUSED;
+ break;
+ case ICMP_NET_UNKNOWN:
+ _net("Rx Received ICMP Unknown Network");
+ port = 0;
+ err = -ENETUNREACH;
+ break;
+ case ICMP_HOST_UNKNOWN:
+ _net("Rx Received ICMP Unknown Host");
+ port = 0;
+ err = -EHOSTUNREACH;
+ break;
+ default:
+ _net("Rx Received ICMP DestUnreach { code=%u }",
+ emsg.ee.ee_code);
+ err = emsg.ee.ee_errno;
+ break;
+ }
+ break;
+
+ case ICMP_TIME_EXCEEDED:
+ _net("Rx Received ICMP TTL Exceeded");
+ err = emsg.ee.ee_errno;
+ break;
+
+ default:
+ _proto("Rx Received ICMP error { type=%u code=%u }",
+ emsg.ee.ee_type, emsg.ee.ee_code);
+ err = emsg.ee.ee_errno;
+ break;
+ }
+ break;
+
+ case SO_EE_ORIGIN_LOCAL:
+ _proto("Rx Received local error { error=%d }",
+ emsg.ee.ee_errno);
+ local = 1;
+ err = emsg.ee.ee_errno;
+ break;
+
+ case SO_EE_ORIGIN_NONE:
+ case SO_EE_ORIGIN_ICMP6:
+ default:
+ _proto("Rx Received error report { orig=%u }",
+ emsg.ee.ee_origin);
+ local = 0;
+ err = emsg.ee.ee_errno;
+ break;
+ }
+
+ /* find all the connections between this transport and the
+ * affected destination */
+ INIT_LIST_HEAD(&connq);
+
+ if (rxrpc_peer_lookup(trans, sin.sin_addr.s_addr,
+ &peer) == 0) {
+ read_lock(&peer->conn_lock);
+ list_for_each(_p, &peer->conn_active) {
+ conn = list_entry(_p, struct rxrpc_connection,
+ link);
+ if (port && conn->addr.sin_port != port)
+ continue;
+ if (!list_empty(&conn->err_link))
+ continue;
+
+ rxrpc_get_connection(conn);
+ list_add_tail(&conn->err_link, &connq);
+ }
+ read_unlock(&peer->conn_lock);
+
+ /* service all those connections */
+ while (!list_empty(&connq)) {
+ conn = list_entry(connq.next,
+ struct rxrpc_connection,
+ err_link);
+ list_del(&conn->err_link);
+
+ rxrpc_conn_handle_error(conn, local, err);
+
+ rxrpc_put_connection(conn);
+ }
+
+ rxrpc_put_peer(peer);
+ }
+ }
+
+ _leave("");
+ return;
+} /* end rxrpc_trans_receive_error_report() */
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-02 04:28:51 +0000