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-rw-r--r--net/rxrpc/ar-error.c253
1 files changed, 253 insertions, 0 deletions
diff --git a/net/rxrpc/ar-error.c b/net/rxrpc/ar-error.c
new file mode 100644
index 000000000000..f5539e2f7b58
--- /dev/null
+++ b/net/rxrpc/ar-error.c
@@ -0,0 +1,253 @@
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 */
28void 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 "NIPQUAD_FMT":%hu",
53 NIPQUAD(addr), ntohs(port));
54 _debug("Msg l:%d d:%d", skb->len, skb->data_len);
55
56 peer = rxrpc_find_peer(local, addr, port);
57 if (IS_ERR(peer)) {
58 rxrpc_free_skb(skb);
59 _leave(" [no peer]");
60 return;
61 }
62
63 trans = rxrpc_find_transport(local, peer);
64 if (!trans) {
65 rxrpc_put_peer(peer);
66 rxrpc_free_skb(skb);
67 _leave(" [no trans]");
68 return;
69 }
70
71 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP &&
72 serr->ee.ee_type == ICMP_DEST_UNREACH &&
73 serr->ee.ee_code == ICMP_FRAG_NEEDED
74 ) {
75 u32 mtu = serr->ee.ee_info;
76
77 _net("Rx Received ICMP Fragmentation Needed (%d)", mtu);
78
79 /* wind down the local interface MTU */
80 if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu) {
81 peer->if_mtu = mtu;
82 _net("I/F MTU %u", mtu);
83 }
84
85 /* ip_rt_frag_needed() may have eaten the info */
86 if (mtu == 0)
87 mtu = ntohs(icmp_hdr(skb)->un.frag.mtu);
88
89 if (mtu == 0) {
90 /* they didn't give us a size, estimate one */
91 if (mtu > 1500) {
92 mtu >>= 1;
93 if (mtu < 1500)
94 mtu = 1500;
95 } else {
96 mtu -= 100;
97 if (mtu < peer->hdrsize)
98 mtu = peer->hdrsize + 4;
99 }
100 }
101
102 if (mtu < peer->mtu) {
103 peer->mtu = mtu;
104 peer->maxdata = peer->mtu - peer->hdrsize;
105 _net("Net MTU %u (maxdata %u)",
106 peer->mtu, peer->maxdata);
107 }
108 }
109
110 rxrpc_put_peer(peer);
111
112 /* pass the transport ref to error_handler to release */
113 skb_queue_tail(&trans->error_queue, skb);
114 schedule_work(&trans->error_handler);
115
116 /* reset and regenerate socket error */
117 spin_lock_bh(&sk->sk_error_queue.lock);
118 sk->sk_err = 0;
119 skb = skb_peek(&sk->sk_error_queue);
120 if (skb) {
121 sk->sk_err = SKB_EXT_ERR(skb)->ee.ee_errno;
122 spin_unlock_bh(&sk->sk_error_queue.lock);
123 sk->sk_error_report(sk);
124 } else {
125 spin_unlock_bh(&sk->sk_error_queue.lock);
126 }
127
128 _leave("");
129}
130
131/*
132 * deal with UDP error messages
133 */
134void rxrpc_UDP_error_handler(struct work_struct *work)
135{
136 struct sock_extended_err *ee;
137 struct sock_exterr_skb *serr;
138 struct rxrpc_transport *trans =
139 container_of(work, struct rxrpc_transport, error_handler);
140 struct sk_buff *skb;
141 int local, err;
142
143 _enter("");
144
145 skb = skb_dequeue(&trans->error_queue);
146 if (!skb)
147 return;
148
149 serr = SKB_EXT_ERR(skb);
150 ee = &serr->ee;
151
152 _net("Rx Error o=%d t=%d c=%d e=%d",
153 ee->ee_origin, ee->ee_type, ee->ee_code, ee->ee_errno);
154
155 err = ee->ee_errno;
156
157 switch (ee->ee_origin) {
158 case SO_EE_ORIGIN_ICMP:
159 local = 0;
160 switch (ee->ee_type) {
161 case ICMP_DEST_UNREACH:
162 switch (ee->ee_code) {
163 case ICMP_NET_UNREACH:
164 _net("Rx Received ICMP Network Unreachable");
165 err = ENETUNREACH;
166 break;
167 case ICMP_HOST_UNREACH:
168 _net("Rx Received ICMP Host Unreachable");
169 err = EHOSTUNREACH;
170 break;
171 case ICMP_PORT_UNREACH:
172 _net("Rx Received ICMP Port Unreachable");
173 err = ECONNREFUSED;
174 break;
175 case ICMP_FRAG_NEEDED:
176 _net("Rx Received ICMP Fragmentation Needed (%d)",
177 ee->ee_info);
178 err = 0; /* dealt with elsewhere */
179 break;
180 case ICMP_NET_UNKNOWN:
181 _net("Rx Received ICMP Unknown Network");
182 err = ENETUNREACH;
183 break;
184 case ICMP_HOST_UNKNOWN:
185 _net("Rx Received ICMP Unknown Host");
186 err = EHOSTUNREACH;
187 break;
188 default:
189 _net("Rx Received ICMP DestUnreach code=%u",
190 ee->ee_code);
191 break;
192 }
193 break;
194
195 case ICMP_TIME_EXCEEDED:
196 _net("Rx Received ICMP TTL Exceeded");
197 break;
198
199 default:
200 _proto("Rx Received ICMP error { type=%u code=%u }",
201 ee->ee_type, ee->ee_code);
202 break;
203 }
204 break;
205
206 case SO_EE_ORIGIN_LOCAL:
207 _proto("Rx Received local error { error=%d }",
208 ee->ee_errno);
209 local = 1;
210 break;
211
212 case SO_EE_ORIGIN_NONE:
213 case SO_EE_ORIGIN_ICMP6:
214 default:
215 _proto("Rx Received error report { orig=%u }",
216 ee->ee_origin);
217 local = 0;
218 break;
219 }
220
221 /* terminate all the affected calls if there's an unrecoverable
222 * error */
223 if (err) {
224 struct rxrpc_call *call, *_n;
225
226 _debug("ISSUE ERROR %d", err);
227
228 spin_lock_bh(&trans->peer->lock);
229 trans->peer->net_error = err;
230
231 list_for_each_entry_safe(call, _n, &trans->peer->error_targets,
232 error_link) {
233 write_lock(&call->state_lock);
234 if (call->state != RXRPC_CALL_COMPLETE &&
235 call->state < RXRPC_CALL_NETWORK_ERROR) {
236 call->state = RXRPC_CALL_NETWORK_ERROR;
237 set_bit(RXRPC_CALL_RCVD_ERROR, &call->events);
238 schedule_work(&call->processor);
239 }
240 write_unlock(&call->state_lock);
241 list_del_init(&call->error_link);
242 }
243
244 spin_unlock_bh(&trans->peer->lock);
245 }
246
247 if (!skb_queue_empty(&trans->error_queue))
248 schedule_work(&trans->error_handler);
249
250 rxrpc_free_skb(skb);
251 rxrpc_put_transport(trans);
252 _leave("");
253}
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