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Linux/net/rxrpc/peer_event.c

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  1 /* Peer event handling, typically ICMP messages.
  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 static void rxrpc_store_error(struct rxrpc_peer *, struct sock_exterr_skb *);
 26 
 27 /*
 28  * Find the peer associated with an ICMP packet.
 29  */
 30 static struct rxrpc_peer *rxrpc_lookup_peer_icmp_rcu(struct rxrpc_local *local,
 31                                                      const struct sk_buff *skb)
 32 {
 33         struct sock_exterr_skb *serr = SKB_EXT_ERR(skb);
 34         struct sockaddr_rxrpc srx;
 35 
 36         _enter("");
 37 
 38         memset(&srx, 0, sizeof(srx));
 39         srx.transport_type = local->srx.transport_type;
 40         srx.transport.family = local->srx.transport.family;
 41 
 42         /* Can we see an ICMP4 packet on an ICMP6 listening socket?  and vice
 43          * versa?
 44          */
 45         switch (srx.transport.family) {
 46         case AF_INET:
 47                 srx.transport.sin.sin_port = serr->port;
 48                 srx.transport_len = sizeof(struct sockaddr_in);
 49                 switch (serr->ee.ee_origin) {
 50                 case SO_EE_ORIGIN_ICMP:
 51                         _net("Rx ICMP");
 52                         memcpy(&srx.transport.sin.sin_addr,
 53                                skb_network_header(skb) + serr->addr_offset,
 54                                sizeof(struct in_addr));
 55                         break;
 56                 case SO_EE_ORIGIN_ICMP6:
 57                         _net("Rx ICMP6 on v4 sock");
 58                         memcpy(&srx.transport.sin.sin_addr,
 59                                skb_network_header(skb) + serr->addr_offset + 12,
 60                                sizeof(struct in_addr));
 61                         break;
 62                 default:
 63                         memcpy(&srx.transport.sin.sin_addr, &ip_hdr(skb)->saddr,
 64                                sizeof(struct in_addr));
 65                         break;
 66                 }
 67                 break;
 68 
 69         default:
 70                 BUG();
 71         }
 72 
 73         return rxrpc_lookup_peer_rcu(local, &srx);
 74 }
 75 
 76 /*
 77  * Handle an MTU/fragmentation problem.
 78  */
 79 static void rxrpc_adjust_mtu(struct rxrpc_peer *peer, struct sock_exterr_skb *serr)
 80 {
 81         u32 mtu = serr->ee.ee_info;
 82 
 83         _net("Rx ICMP Fragmentation Needed (%d)", mtu);
 84 
 85         /* wind down the local interface MTU */
 86         if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu) {
 87                 peer->if_mtu = mtu;
 88                 _net("I/F MTU %u", mtu);
 89         }
 90 
 91         if (mtu == 0) {
 92                 /* they didn't give us a size, estimate one */
 93                 mtu = peer->if_mtu;
 94                 if (mtu > 1500) {
 95                         mtu >>= 1;
 96                         if (mtu < 1500)
 97                                 mtu = 1500;
 98                 } else {
 99                         mtu -= 100;
100                         if (mtu < peer->hdrsize)
101                                 mtu = peer->hdrsize + 4;
102                 }
103         }
104 
105         if (mtu < peer->mtu) {
106                 spin_lock_bh(&peer->lock);
107                 peer->mtu = mtu;
108                 peer->maxdata = peer->mtu - peer->hdrsize;
109                 spin_unlock_bh(&peer->lock);
110                 _net("Net MTU %u (maxdata %u)",
111                      peer->mtu, peer->maxdata);
112         }
113 }
114 
115 /*
116  * Handle an error received on the local endpoint.
117  */
118 void rxrpc_error_report(struct sock *sk)
119 {
120         struct sock_exterr_skb *serr;
121         struct rxrpc_local *local = sk->sk_user_data;
122         struct rxrpc_peer *peer;
123         struct sk_buff *skb;
124 
125         _enter("%p{%d}", sk, local->debug_id);
126 
127         skb = sock_dequeue_err_skb(sk);
128         if (!skb) {
129                 _leave("UDP socket errqueue empty");
130                 return;
131         }
132         serr = SKB_EXT_ERR(skb);
133         if (!skb->len && serr->ee.ee_origin == SO_EE_ORIGIN_TIMESTAMPING) {
134                 _leave("UDP empty message");
135                 kfree_skb(skb);
136                 return;
137         }
138 
139         rxrpc_new_skb(skb);
140 
141         rcu_read_lock();
142         peer = rxrpc_lookup_peer_icmp_rcu(local, skb);
143         if (peer && !rxrpc_get_peer_maybe(peer))
144                 peer = NULL;
145         if (!peer) {
146                 rcu_read_unlock();
147                 rxrpc_free_skb(skb);
148                 _leave(" [no peer]");
149                 return;
150         }
151 
152         if ((serr->ee.ee_origin == SO_EE_ORIGIN_ICMP &&
153              serr->ee.ee_type == ICMP_DEST_UNREACH &&
154              serr->ee.ee_code == ICMP_FRAG_NEEDED)) {
155                 rxrpc_adjust_mtu(peer, serr);
156                 rcu_read_unlock();
157                 rxrpc_free_skb(skb);
158                 rxrpc_put_peer(peer);
159                 _leave(" [MTU update]");
160                 return;
161         }
162 
163         rxrpc_store_error(peer, serr);
164         rcu_read_unlock();
165         rxrpc_free_skb(skb);
166 
167         /* The ref we obtained is passed off to the work item */
168         rxrpc_queue_work(&peer->error_distributor);
169         _leave("");
170 }
171 
172 /*
173  * Map an error report to error codes on the peer record.
174  */
175 static void rxrpc_store_error(struct rxrpc_peer *peer,
176                               struct sock_exterr_skb *serr)
177 {
178         struct sock_extended_err *ee;
179         int err;
180 
181         _enter("");
182 
183         ee = &serr->ee;
184 
185         _net("Rx Error o=%d t=%d c=%d e=%d",
186              ee->ee_origin, ee->ee_type, ee->ee_code, ee->ee_errno);
187 
188         err = ee->ee_errno;
189 
190         switch (ee->ee_origin) {
191         case SO_EE_ORIGIN_ICMP:
192                 switch (ee->ee_type) {
193                 case ICMP_DEST_UNREACH:
194                         switch (ee->ee_code) {
195                         case ICMP_NET_UNREACH:
196                                 _net("Rx Received ICMP Network Unreachable");
197                                 break;
198                         case ICMP_HOST_UNREACH:
199                                 _net("Rx Received ICMP Host Unreachable");
200                                 break;
201                         case ICMP_PORT_UNREACH:
202                                 _net("Rx Received ICMP Port Unreachable");
203                                 break;
204                         case ICMP_NET_UNKNOWN:
205                                 _net("Rx Received ICMP Unknown Network");
206                                 break;
207                         case ICMP_HOST_UNKNOWN:
208                                 _net("Rx Received ICMP Unknown Host");
209                                 break;
210                         default:
211                                 _net("Rx Received ICMP DestUnreach code=%u",
212                                      ee->ee_code);
213                                 break;
214                         }
215                         break;
216 
217                 case ICMP_TIME_EXCEEDED:
218                         _net("Rx Received ICMP TTL Exceeded");
219                         break;
220 
221                 default:
222                         _proto("Rx Received ICMP error { type=%u code=%u }",
223                                ee->ee_type, ee->ee_code);
224                         break;
225                 }
226                 break;
227 
228         case SO_EE_ORIGIN_NONE:
229         case SO_EE_ORIGIN_LOCAL:
230                 _proto("Rx Received local error { error=%d }", err);
231                 err += RXRPC_LOCAL_ERROR_OFFSET;
232                 break;
233 
234         case SO_EE_ORIGIN_ICMP6:
235         default:
236                 _proto("Rx Received error report { orig=%u }", ee->ee_origin);
237                 break;
238         }
239 
240         peer->error_report = err;
241 }
242 
243 /*
244  * Distribute an error that occurred on a peer
245  */
246 void rxrpc_peer_error_distributor(struct work_struct *work)
247 {
248         struct rxrpc_peer *peer =
249                 container_of(work, struct rxrpc_peer, error_distributor);
250         struct rxrpc_call *call;
251         int error_report;
252 
253         _enter("");
254 
255         error_report = READ_ONCE(peer->error_report);
256 
257         _debug("ISSUE ERROR %d", error_report);
258 
259         spin_lock_bh(&peer->lock);
260 
261         while (!hlist_empty(&peer->error_targets)) {
262                 call = hlist_entry(peer->error_targets.first,
263                                    struct rxrpc_call, error_link);
264                 hlist_del_init(&call->error_link);
265 
266                 write_lock(&call->state_lock);
267                 if (call->state != RXRPC_CALL_COMPLETE &&
268                     call->state < RXRPC_CALL_NETWORK_ERROR) {
269                         call->error_report = error_report;
270                         call->state = RXRPC_CALL_NETWORK_ERROR;
271                         set_bit(RXRPC_CALL_EV_RCVD_ERROR, &call->events);
272                         rxrpc_queue_call(call);
273                 }
274                 write_unlock(&call->state_lock);
275         }
276 
277         spin_unlock_bh(&peer->lock);
278 
279         rxrpc_put_peer(peer);
280         _leave("");
281 }
282 

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