~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/rxrpc/ar-error.c

Version: ~ [ linux-5.6 ] ~ [ linux-5.5.13 ] ~ [ linux-5.4.28 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.113 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.174 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.217 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.217 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /* Error message handling (ICMP)
  2  *
  3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the License, or (at your option) any later version.
 10  */
 11 
 12 #include <linux/module.h>
 13 #include <linux/net.h>
 14 #include <linux/skbuff.h>
 15 #include <linux/errqueue.h>
 16 #include <linux/udp.h>
 17 #include <linux/in.h>
 18 #include <linux/in6.h>
 19 #include <linux/icmp.h>
 20 #include <net/sock.h>
 21 #include <net/af_rxrpc.h>
 22 #include <net/ip.h>
 23 #include "ar-internal.h"
 24 
 25 /*
 26  * handle an error received on the local endpoint
 27  */
 28 void rxrpc_UDP_error_report(struct sock *sk)
 29 {
 30         struct sock_exterr_skb *serr;
 31         struct rxrpc_transport *trans;
 32         struct rxrpc_local *local = sk->sk_user_data;
 33         struct rxrpc_peer *peer;
 34         struct sk_buff *skb;
 35         __be32 addr;
 36         __be16 port;
 37 
 38         _enter("%p{%d}", sk, local->debug_id);
 39 
 40         skb = sock_dequeue_err_skb(sk);
 41         if (!skb) {
 42                 _leave("UDP socket errqueue empty");
 43                 return;
 44         }
 45         serr = SKB_EXT_ERR(skb);
 46         if (!skb->len && serr->ee.ee_origin == SO_EE_ORIGIN_TIMESTAMPING) {
 47                 _leave("UDP empty message");
 48                 kfree_skb(skb);
 49                 return;
 50         }
 51 
 52         rxrpc_new_skb(skb);
 53 
 54         addr = *(__be32 *)(skb_network_header(skb) + serr->addr_offset);
 55         port = serr->port;
 56 
 57         _net("Rx UDP Error from %pI4:%hu", &addr, ntohs(port));
 58         _debug("Msg l:%d d:%d", skb->len, skb->data_len);
 59 
 60         peer = rxrpc_find_peer(local, addr, port);
 61         if (IS_ERR(peer)) {
 62                 rxrpc_free_skb(skb);
 63                 _leave(" [no peer]");
 64                 return;
 65         }
 66 
 67         trans = rxrpc_find_transport(local, peer);
 68         if (!trans) {
 69                 rxrpc_put_peer(peer);
 70                 rxrpc_free_skb(skb);
 71                 _leave(" [no trans]");
 72                 return;
 73         }
 74 
 75         if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP &&
 76             serr->ee.ee_type == ICMP_DEST_UNREACH &&
 77             serr->ee.ee_code == ICMP_FRAG_NEEDED
 78             ) {
 79                 u32 mtu = serr->ee.ee_info;
 80 
 81                 _net("Rx Received ICMP Fragmentation Needed (%d)", mtu);
 82 
 83                 /* wind down the local interface MTU */
 84                 if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu) {
 85                         peer->if_mtu = mtu;
 86                         _net("I/F MTU %u", mtu);
 87                 }
 88 
 89                 if (mtu == 0) {
 90                         /* they didn't give us a size, estimate one */
 91                         mtu = peer->if_mtu;
 92                         if (mtu > 1500) {
 93                                 mtu >>= 1;
 94                                 if (mtu < 1500)
 95                                         mtu = 1500;
 96                         } else {
 97                                 mtu -= 100;
 98                                 if (mtu < peer->hdrsize)
 99                                         mtu = peer->hdrsize + 4;
100                         }
101                 }
102 
103                 if (mtu < peer->mtu) {
104                         spin_lock_bh(&peer->lock);
105                         peer->mtu = mtu;
106                         peer->maxdata = peer->mtu - peer->hdrsize;
107                         spin_unlock_bh(&peer->lock);
108                         _net("Net MTU %u (maxdata %u)",
109                              peer->mtu, peer->maxdata);
110                 }
111         }
112 
113         rxrpc_put_peer(peer);
114 
115         /* pass the transport ref to error_handler to release */
116         skb_queue_tail(&trans->error_queue, skb);
117         rxrpc_queue_work(&trans->error_handler);
118 
119         _leave("");
120 }
121 
122 /*
123  * deal with UDP error messages
124  */
125 void rxrpc_UDP_error_handler(struct work_struct *work)
126 {
127         struct sock_extended_err *ee;
128         struct sock_exterr_skb *serr;
129         struct rxrpc_transport *trans =
130                 container_of(work, struct rxrpc_transport, error_handler);
131         struct sk_buff *skb;
132         int err;
133 
134         _enter("");
135 
136         skb = skb_dequeue(&trans->error_queue);
137         if (!skb)
138                 return;
139 
140         serr = SKB_EXT_ERR(skb);
141         ee = &serr->ee;
142 
143         _net("Rx Error o=%d t=%d c=%d e=%d",
144              ee->ee_origin, ee->ee_type, ee->ee_code, ee->ee_errno);
145 
146         err = ee->ee_errno;
147 
148         switch (ee->ee_origin) {
149         case SO_EE_ORIGIN_ICMP:
150                 switch (ee->ee_type) {
151                 case ICMP_DEST_UNREACH:
152                         switch (ee->ee_code) {
153                         case ICMP_NET_UNREACH:
154                                 _net("Rx Received ICMP Network Unreachable");
155                                 err = ENETUNREACH;
156                                 break;
157                         case ICMP_HOST_UNREACH:
158                                 _net("Rx Received ICMP Host Unreachable");
159                                 err = EHOSTUNREACH;
160                                 break;
161                         case ICMP_PORT_UNREACH:
162                                 _net("Rx Received ICMP Port Unreachable");
163                                 err = ECONNREFUSED;
164                                 break;
165                         case ICMP_FRAG_NEEDED:
166                                 _net("Rx Received ICMP Fragmentation Needed (%d)",
167                                      ee->ee_info);
168                                 err = 0; /* dealt with elsewhere */
169                                 break;
170                         case ICMP_NET_UNKNOWN:
171                                 _net("Rx Received ICMP Unknown Network");
172                                 err = ENETUNREACH;
173                                 break;
174                         case ICMP_HOST_UNKNOWN:
175                                 _net("Rx Received ICMP Unknown Host");
176                                 err = EHOSTUNREACH;
177                                 break;
178                         default:
179                                 _net("Rx Received ICMP DestUnreach code=%u",
180                                      ee->ee_code);
181                                 break;
182                         }
183                         break;
184 
185                 case ICMP_TIME_EXCEEDED:
186                         _net("Rx Received ICMP TTL Exceeded");
187                         break;
188 
189                 default:
190                         _proto("Rx Received ICMP error { type=%u code=%u }",
191                                ee->ee_type, ee->ee_code);
192                         break;
193                 }
194                 break;
195 
196         case SO_EE_ORIGIN_LOCAL:
197                 _proto("Rx Received local error { error=%d }",
198                        ee->ee_errno);
199                 break;
200 
201         case SO_EE_ORIGIN_NONE:
202         case SO_EE_ORIGIN_ICMP6:
203         default:
204                 _proto("Rx Received error report { orig=%u }",
205                        ee->ee_origin);
206                 break;
207         }
208 
209         /* terminate all the affected calls if there's an unrecoverable
210          * error */
211         if (err) {
212                 struct rxrpc_call *call, *_n;
213 
214                 _debug("ISSUE ERROR %d", err);
215 
216                 spin_lock_bh(&trans->peer->lock);
217                 trans->peer->net_error = err;
218 
219                 list_for_each_entry_safe(call, _n, &trans->peer->error_targets,
220                                          error_link) {
221                         write_lock(&call->state_lock);
222                         if (call->state != RXRPC_CALL_COMPLETE &&
223                             call->state < RXRPC_CALL_NETWORK_ERROR) {
224                                 call->state = RXRPC_CALL_NETWORK_ERROR;
225                                 set_bit(RXRPC_CALL_RCVD_ERROR, &call->events);
226                                 rxrpc_queue_call(call);
227                         }
228                         write_unlock(&call->state_lock);
229                         list_del_init(&call->error_link);
230                 }
231 
232                 spin_unlock_bh(&trans->peer->lock);
233         }
234 
235         if (!skb_queue_empty(&trans->error_queue))
236                 rxrpc_queue_work(&trans->error_handler);
237 
238         rxrpc_free_skb(skb);
239         rxrpc_put_transport(trans);
240         _leave("");
241 }
242 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp