RxRPC: Use uX/sX rather than uintX_t/intX_t types
[linux-2.6.git] / net / rxrpc / ar-error.c
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 = skb_dequeue(&sk->sk_error_queue);
41         if (!skb) {
42                 _leave("UDP socket errqueue empty");
43                 return;
44         }
45
46         rxrpc_new_skb(skb);
47
48         serr = SKB_EXT_ERR(skb);
49         addr = *(__be32 *)(skb_network_header(skb) + serr->addr_offset);
50         port = serr->port;
51
52         _net("Rx UDP Error from %pI4:%hu", &addr, ntohs(port));
53         _debug("Msg l:%d d:%d", skb->len, skb->data_len);
54
55         peer = rxrpc_find_peer(local, addr, port);
56         if (IS_ERR(peer)) {
57                 rxrpc_free_skb(skb);
58                 _leave(" [no peer]");
59                 return;
60         }
61
62         trans = rxrpc_find_transport(local, peer);
63         if (!trans) {
64                 rxrpc_put_peer(peer);
65                 rxrpc_free_skb(skb);
66                 _leave(" [no trans]");
67                 return;
68         }
69
70         if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP &&
71             serr->ee.ee_type == ICMP_DEST_UNREACH &&
72             serr->ee.ee_code == ICMP_FRAG_NEEDED
73             ) {
74                 u32 mtu = serr->ee.ee_info;
75
76                 _net("Rx Received ICMP Fragmentation Needed (%d)", mtu);
77
78                 /* wind down the local interface MTU */
79                 if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu) {
80                         peer->if_mtu = mtu;
81                         _net("I/F MTU %u", mtu);
82                 }
83
84                 /* ip_rt_frag_needed() may have eaten the info */
85                 if (mtu == 0)
86                         mtu = ntohs(icmp_hdr(skb)->un.frag.mtu);
87
88                 if (mtu == 0) {
89                         /* they didn't give us a size, estimate one */
90                         if (mtu > 1500) {
91                                 mtu >>= 1;
92                                 if (mtu < 1500)
93                                         mtu = 1500;
94                         } else {
95                                 mtu -= 100;
96                                 if (mtu < peer->hdrsize)
97                                         mtu = peer->hdrsize + 4;
98                         }
99                 }
100
101                 if (mtu < peer->mtu) {
102                         spin_lock_bh(&peer->lock);
103                         peer->mtu = mtu;
104                         peer->maxdata = peer->mtu - peer->hdrsize;
105                         spin_unlock_bh(&peer->lock);
106                         _net("Net MTU %u (maxdata %u)",
107                              peer->mtu, peer->maxdata);
108                 }
109         }
110
111         rxrpc_put_peer(peer);
112
113         /* pass the transport ref to error_handler to release */
114         skb_queue_tail(&trans->error_queue, skb);
115         rxrpc_queue_work(&trans->error_handler);
116
117         /* reset and regenerate socket error */
118         spin_lock_bh(&sk->sk_error_queue.lock);
119         sk->sk_err = 0;
120         skb = skb_peek(&sk->sk_error_queue);
121         if (skb) {
122                 sk->sk_err = SKB_EXT_ERR(skb)->ee.ee_errno;
123                 spin_unlock_bh(&sk->sk_error_queue.lock);
124                 sk->sk_error_report(sk);
125         } else {
126                 spin_unlock_bh(&sk->sk_error_queue.lock);
127         }
128
129         _leave("");
130 }
131
132 /*
133  * deal with UDP error messages
134  */
135 void rxrpc_UDP_error_handler(struct work_struct *work)
136 {
137         struct sock_extended_err *ee;
138         struct sock_exterr_skb *serr;
139         struct rxrpc_transport *trans =
140                 container_of(work, struct rxrpc_transport, error_handler);
141         struct sk_buff *skb;
142         int local, err;
143
144         _enter("");
145
146         skb = skb_dequeue(&trans->error_queue);
147         if (!skb)
148                 return;
149
150         serr = SKB_EXT_ERR(skb);
151         ee = &serr->ee;
152
153         _net("Rx Error o=%d t=%d c=%d e=%d",
154              ee->ee_origin, ee->ee_type, ee->ee_code, ee->ee_errno);
155
156         err = ee->ee_errno;
157
158         switch (ee->ee_origin) {
159         case SO_EE_ORIGIN_ICMP:
160                 local = 0;
161                 switch (ee->ee_type) {
162                 case ICMP_DEST_UNREACH:
163                         switch (ee->ee_code) {
164                         case ICMP_NET_UNREACH:
165                                 _net("Rx Received ICMP Network Unreachable");
166                                 err = ENETUNREACH;
167                                 break;
168                         case ICMP_HOST_UNREACH:
169                                 _net("Rx Received ICMP Host Unreachable");
170                                 err = EHOSTUNREACH;
171                                 break;
172                         case ICMP_PORT_UNREACH:
173                                 _net("Rx Received ICMP Port Unreachable");
174                                 err = ECONNREFUSED;
175                                 break;
176                         case ICMP_FRAG_NEEDED:
177                                 _net("Rx Received ICMP Fragmentation Needed (%d)",
178                                      ee->ee_info);
179                                 err = 0; /* dealt with elsewhere */
180                                 break;
181                         case ICMP_NET_UNKNOWN:
182                                 _net("Rx Received ICMP Unknown Network");
183                                 err = ENETUNREACH;
184                                 break;
185                         case ICMP_HOST_UNKNOWN:
186                                 _net("Rx Received ICMP Unknown Host");
187                                 err = EHOSTUNREACH;
188                                 break;
189                         default:
190                                 _net("Rx Received ICMP DestUnreach code=%u",
191                                      ee->ee_code);
192                                 break;
193                         }
194                         break;
195
196                 case ICMP_TIME_EXCEEDED:
197                         _net("Rx Received ICMP TTL Exceeded");
198                         break;
199
200                 default:
201                         _proto("Rx Received ICMP error { type=%u code=%u }",
202                                ee->ee_type, ee->ee_code);
203                         break;
204                 }
205                 break;
206
207         case SO_EE_ORIGIN_LOCAL:
208                 _proto("Rx Received local error { error=%d }",
209                        ee->ee_errno);
210                 local = 1;
211                 break;
212
213         case SO_EE_ORIGIN_NONE:
214         case SO_EE_ORIGIN_ICMP6:
215         default:
216                 _proto("Rx Received error report { orig=%u }",
217                        ee->ee_origin);
218                 local = 0;
219                 break;
220         }
221
222         /* terminate all the affected calls if there's an unrecoverable
223          * error */
224         if (err) {
225                 struct rxrpc_call *call, *_n;
226
227                 _debug("ISSUE ERROR %d", err);
228
229                 spin_lock_bh(&trans->peer->lock);
230                 trans->peer->net_error = err;
231
232                 list_for_each_entry_safe(call, _n, &trans->peer->error_targets,
233                                          error_link) {
234                         write_lock(&call->state_lock);
235                         if (call->state != RXRPC_CALL_COMPLETE &&
236                             call->state < RXRPC_CALL_NETWORK_ERROR) {
237                                 call->state = RXRPC_CALL_NETWORK_ERROR;
238                                 set_bit(RXRPC_CALL_RCVD_ERROR, &call->events);
239                                 rxrpc_queue_call(call);
240                         }
241                         write_unlock(&call->state_lock);
242                         list_del_init(&call->error_link);
243                 }
244
245                 spin_unlock_bh(&trans->peer->lock);
246         }
247
248         if (!skb_queue_empty(&trans->error_queue))
249                 rxrpc_queue_work(&trans->error_handler);
250
251         rxrpc_free_skb(skb);
252         rxrpc_put_transport(trans);
253         _leave("");
254 }