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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 | if (mtu == 0) { |
85 | /* they didn't give us a size, estimate one */ |
86 | mtu = peer->if_mtu; |
87 | if (mtu > 1500) { |
88 | mtu >>= 1; |
89 | if (mtu < 1500) |
90 | mtu = 1500; |
91 | } else { |
92 | mtu -= 100; |
93 | if (mtu < peer->hdrsize) |
94 | mtu = peer->hdrsize + 4; |
95 | } |
96 | } |
97 | |
98 | if (mtu < peer->mtu) { |
99 | spin_lock_bh(&peer->lock); |
100 | peer->mtu = mtu; |
101 | peer->maxdata = peer->mtu - peer->hdrsize; |
102 | spin_unlock_bh(&peer->lock); |
103 | _net("Net MTU %u (maxdata %u)", |
104 | peer->mtu, peer->maxdata); |
105 | } |
106 | } |
107 | |
108 | rxrpc_put_peer(peer); |
109 | |
110 | /* pass the transport ref to error_handler to release */ |
111 | skb_queue_tail(&trans->error_queue, skb); |
112 | rxrpc_queue_work(&trans->error_handler); |
113 | |
114 | /* reset and regenerate socket error */ |
115 | spin_lock_bh(&sk->sk_error_queue.lock); |
116 | sk->sk_err = 0; |
117 | skb = skb_peek(&sk->sk_error_queue); |
118 | if (skb) { |
119 | sk->sk_err = SKB_EXT_ERR(skb)->ee.ee_errno; |
120 | spin_unlock_bh(&sk->sk_error_queue.lock); |
121 | sk->sk_error_report(sk); |
122 | } else { |
123 | spin_unlock_bh(&sk->sk_error_queue.lock); |
124 | } |
125 | |
126 | _leave(""); |
127 | } |
128 | |
129 | /* |
130 | * deal with UDP error messages |
131 | */ |
132 | void rxrpc_UDP_error_handler(struct work_struct *work) |
133 | { |
134 | struct sock_extended_err *ee; |
135 | struct sock_exterr_skb *serr; |
136 | struct rxrpc_transport *trans = |
137 | container_of(work, struct rxrpc_transport, error_handler); |
138 | struct sk_buff *skb; |
139 | int err; |
140 | |
141 | _enter(""); |
142 | |
143 | skb = skb_dequeue(&trans->error_queue); |
144 | if (!skb) |
145 | return; |
146 | |
147 | serr = SKB_EXT_ERR(skb); |
148 | ee = &serr->ee; |
149 | |
150 | _net("Rx Error o=%d t=%d c=%d e=%d", |
151 | ee->ee_origin, ee->ee_type, ee->ee_code, ee->ee_errno); |
152 | |
153 | err = ee->ee_errno; |
154 | |
155 | switch (ee->ee_origin) { |
156 | case SO_EE_ORIGIN_ICMP: |
157 | switch (ee->ee_type) { |
158 | case ICMP_DEST_UNREACH: |
159 | switch (ee->ee_code) { |
160 | case ICMP_NET_UNREACH: |
161 | _net("Rx Received ICMP Network Unreachable"); |
162 | err = ENETUNREACH; |
163 | break; |
164 | case ICMP_HOST_UNREACH: |
165 | _net("Rx Received ICMP Host Unreachable"); |
166 | err = EHOSTUNREACH; |
167 | break; |
168 | case ICMP_PORT_UNREACH: |
169 | _net("Rx Received ICMP Port Unreachable"); |
170 | err = ECONNREFUSED; |
171 | break; |
172 | case ICMP_FRAG_NEEDED: |
173 | _net("Rx Received ICMP Fragmentation Needed (%d)", |
174 | ee->ee_info); |
175 | err = 0; /* dealt with elsewhere */ |
176 | break; |
177 | case ICMP_NET_UNKNOWN: |
178 | _net("Rx Received ICMP Unknown Network"); |
179 | err = ENETUNREACH; |
180 | break; |
181 | case ICMP_HOST_UNKNOWN: |
182 | _net("Rx Received ICMP Unknown Host"); |
183 | err = EHOSTUNREACH; |
184 | break; |
185 | default: |
186 | _net("Rx Received ICMP DestUnreach code=%u", |
187 | ee->ee_code); |
188 | break; |
189 | } |
190 | break; |
191 | |
192 | case ICMP_TIME_EXCEEDED: |
193 | _net("Rx Received ICMP TTL Exceeded"); |
194 | break; |
195 | |
196 | default: |
197 | _proto("Rx Received ICMP error { type=%u code=%u }", |
198 | ee->ee_type, ee->ee_code); |
199 | break; |
200 | } |
201 | break; |
202 | |
203 | case SO_EE_ORIGIN_LOCAL: |
204 | _proto("Rx Received local error { error=%d }", |
205 | ee->ee_errno); |
206 | break; |
207 | |
208 | case SO_EE_ORIGIN_NONE: |
209 | case SO_EE_ORIGIN_ICMP6: |
210 | default: |
211 | _proto("Rx Received error report { orig=%u }", |
212 | ee->ee_origin); |
213 | break; |
214 | } |
215 | |
216 | /* terminate all the affected calls if there's an unrecoverable |
217 | * error */ |
218 | if (err) { |
219 | struct rxrpc_call *call, *_n; |
220 | |
221 | _debug("ISSUE ERROR %d", err); |
222 | |
223 | spin_lock_bh(&trans->peer->lock); |
224 | trans->peer->net_error = err; |
225 | |
226 | list_for_each_entry_safe(call, _n, &trans->peer->error_targets, |
227 | error_link) { |
228 | write_lock(&call->state_lock); |
229 | if (call->state != RXRPC_CALL_COMPLETE && |
230 | call->state < RXRPC_CALL_NETWORK_ERROR) { |
231 | call->state = RXRPC_CALL_NETWORK_ERROR; |
232 | set_bit(RXRPC_CALL_RCVD_ERROR, &call->events); |
233 | rxrpc_queue_call(call); |
234 | } |
235 | write_unlock(&call->state_lock); |
236 | list_del_init(&call->error_link); |
237 | } |
238 | |
239 | spin_unlock_bh(&trans->peer->lock); |
240 | } |
241 | |
242 | if (!skb_queue_empty(&trans->error_queue)) |
243 | rxrpc_queue_work(&trans->error_handler); |
244 | |
245 | rxrpc_free_skb(skb); |
246 | rxrpc_put_transport(trans); |
247 | _leave(""); |
248 | } |
249 |
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