--- /dev/null
+/* Error message handling (ICMP)
+ *
+ * Copyright (C) 2007 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/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/errqueue.h>
+#include <linux/udp.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/icmp.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <net/ip.h>
+#include "ar-internal.h"
+
+/*
+ * handle an error received on the local endpoint
+ */
+void rxrpc_UDP_error_report(struct sock *sk)
+{
+ struct sock_exterr_skb *serr;
+ struct rxrpc_transport *trans;
+ struct rxrpc_local *local = sk->sk_user_data;
+ struct rxrpc_peer *peer;
+ struct sk_buff *skb;
+ __be32 addr;
+ __be16 port;
+
+ _enter("%p{%d}", sk, local->debug_id);
+
+ skb = skb_dequeue(&sk->sk_error_queue);
+ if (!skb) {
+ _leave("UDP socket errqueue empty");
+ return;
+ }
+
+ rxrpc_new_skb(skb);
+
+ serr = SKB_EXT_ERR(skb);
+ addr = *(__be32 *)(skb_network_header(skb) + serr->addr_offset);
+ port = serr->port;
+
+ _net("Rx UDP Error from "NIPQUAD_FMT":%hu",
+ NIPQUAD(addr), ntohs(port));
+ _debug("Msg l:%d d:%d", skb->len, skb->data_len);
+
+ peer = rxrpc_find_peer(local, addr, port);
+ if (IS_ERR(peer)) {
+ rxrpc_free_skb(skb);
+ _leave(" [no peer]");
+ return;
+ }
+
+ trans = rxrpc_find_transport(local, peer);
+ if (!trans) {
+ rxrpc_put_peer(peer);
+ rxrpc_free_skb(skb);
+ _leave(" [no trans]");
+ return;
+ }
+
+ if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP &&
+ serr->ee.ee_type == ICMP_DEST_UNREACH &&
+ serr->ee.ee_code == ICMP_FRAG_NEEDED
+ ) {
+ u32 mtu = serr->ee.ee_info;
+
+ _net("Rx Received ICMP Fragmentation Needed (%d)", mtu);
+
+ /* wind down the local interface MTU */
+ if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu) {
+ peer->if_mtu = mtu;
+ _net("I/F MTU %u", mtu);
+ }
+
+ /* ip_rt_frag_needed() may have eaten the info */
+ if (mtu == 0)
+ mtu = ntohs(icmp_hdr(skb)->un.frag.mtu);
+
+ if (mtu == 0) {
+ /* they didn't give us a size, estimate one */
+ if (mtu > 1500) {
+ mtu >>= 1;
+ if (mtu < 1500)
+ mtu = 1500;
+ } else {
+ mtu -= 100;
+ if (mtu < peer->hdrsize)
+ mtu = peer->hdrsize + 4;
+ }
+ }
+
+ if (mtu < peer->mtu) {
+ peer->mtu = mtu;
+ peer->maxdata = peer->mtu - peer->hdrsize;
+ _net("Net MTU %u (maxdata %u)",
+ peer->mtu, peer->maxdata);
+ }
+ }
+
+ rxrpc_put_peer(peer);
+
+ /* pass the transport ref to error_handler to release */
+ skb_queue_tail(&trans->error_queue, skb);
+ schedule_work(&trans->error_handler);
+
+ /* reset and regenerate socket error */
+ spin_lock_bh(&sk->sk_error_queue.lock);
+ sk->sk_err = 0;
+ skb = skb_peek(&sk->sk_error_queue);
+ if (skb) {
+ sk->sk_err = SKB_EXT_ERR(skb)->ee.ee_errno;
+ spin_unlock_bh(&sk->sk_error_queue.lock);
+ sk->sk_error_report(sk);
+ } else {
+ spin_unlock_bh(&sk->sk_error_queue.lock);
+ }
+
+ _leave("");
+}
+
+/*
+ * deal with UDP error messages
+ */
+void rxrpc_UDP_error_handler(struct work_struct *work)
+{
+ struct sock_extended_err *ee;
+ struct sock_exterr_skb *serr;
+ struct rxrpc_transport *trans =
+ container_of(work, struct rxrpc_transport, error_handler);
+ struct sk_buff *skb;
+ int local, err;
+
+ _enter("");
+
+ skb = skb_dequeue(&trans->error_queue);
+ if (!skb)
+ return;
+
+ serr = SKB_EXT_ERR(skb);
+ ee = &serr->ee;
+
+ _net("Rx Error o=%d t=%d c=%d e=%d",
+ ee->ee_origin, ee->ee_type, ee->ee_code, ee->ee_errno);
+
+ err = ee->ee_errno;
+
+ switch (ee->ee_origin) {
+ case SO_EE_ORIGIN_ICMP:
+ local = 0;
+ switch (ee->ee_type) {
+ case ICMP_DEST_UNREACH:
+ switch (ee->ee_code) {
+ case ICMP_NET_UNREACH:
+ _net("Rx Received ICMP Network Unreachable");
+ err = ENETUNREACH;
+ break;
+ case ICMP_HOST_UNREACH:
+ _net("Rx Received ICMP Host Unreachable");
+ err = EHOSTUNREACH;
+ break;
+ case ICMP_PORT_UNREACH:
+ _net("Rx Received ICMP Port Unreachable");
+ err = ECONNREFUSED;
+ break;
+ case ICMP_FRAG_NEEDED:
+ _net("Rx Received ICMP Fragmentation Needed (%d)",
+ ee->ee_info);
+ err = 0; /* dealt with elsewhere */
+ break;
+ case ICMP_NET_UNKNOWN:
+ _net("Rx Received ICMP Unknown Network");
+ err = ENETUNREACH;
+ break;
+ case ICMP_HOST_UNKNOWN:
+ _net("Rx Received ICMP Unknown Host");
+ err = EHOSTUNREACH;
+ break;
+ default:
+ _net("Rx Received ICMP DestUnreach code=%u",
+ ee->ee_code);
+ break;
+ }
+ break;
+
+ case ICMP_TIME_EXCEEDED:
+ _net("Rx Received ICMP TTL Exceeded");
+ break;
+
+ default:
+ _proto("Rx Received ICMP error { type=%u code=%u }",
+ ee->ee_type, ee->ee_code);
+ break;
+ }
+ break;
+
+ case SO_EE_ORIGIN_LOCAL:
+ _proto("Rx Received local error { error=%d }",
+ ee->ee_errno);
+ local = 1;
+ break;
+
+ case SO_EE_ORIGIN_NONE:
+ case SO_EE_ORIGIN_ICMP6:
+ default:
+ _proto("Rx Received error report { orig=%u }",
+ ee->ee_origin);
+ local = 0;
+ break;
+ }
+
+ /* terminate all the affected calls if there's an unrecoverable
+ * error */
+ if (err) {
+ struct rxrpc_call *call, *_n;
+
+ _debug("ISSUE ERROR %d", err);
+
+ spin_lock_bh(&trans->peer->lock);
+ trans->peer->net_error = err;
+
+ list_for_each_entry_safe(call, _n, &trans->peer->error_targets,
+ error_link) {
+ write_lock(&call->state_lock);
+ if (call->state != RXRPC_CALL_COMPLETE &&
+ call->state < RXRPC_CALL_NETWORK_ERROR) {
+ call->state = RXRPC_CALL_NETWORK_ERROR;
+ set_bit(RXRPC_CALL_RCVD_ERROR, &call->events);
+ schedule_work(&call->processor);
+ }
+ write_unlock(&call->state_lock);
+ list_del_init(&call->error_link);
+ }
+
+ spin_unlock_bh(&trans->peer->lock);
+ }
+
+ if (!skb_queue_empty(&trans->error_queue))
+ schedule_work(&trans->error_handler);
+
+ rxrpc_free_skb(skb);
+ rxrpc_put_transport(trans);
+ _leave("");
+}
projects / cascardo / linux.git / blobdiff