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[/] [test_project/] [trunk/] [linux_sd_driver/] [net/] [rxrpc/] [ar-error.c] - Blame information for rev 82

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Line No. Rev Author Line
1 62 marcus.erl 
/* 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>
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#include <linux/skbuff.h>
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#include <linux/errqueue.h>
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#include <linux/udp.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <linux/icmp.h>
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#include <net/sock.h>
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#include <net/af_rxrpc.h>
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#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)
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{
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        struct sock_exterr_skb *serr;
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        struct rxrpc_transport *trans;
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        struct rxrpc_local *local = sk->sk_user_data;
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        struct rxrpc_peer *peer;
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        struct sk_buff *skb;
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        __be32 addr;
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        __be16 port;
37 
 
38 
        _enter("%p{%d}", sk, local->debug_id);
39 
 
40 
        skb = skb_dequeue(&sk->sk_error_queue);
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        if (!skb) {
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                _leave("UDP socket errqueue empty");
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                return;
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        }
45 
 
46 
        rxrpc_new_skb(skb);
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48 
        serr = SKB_EXT_ERR(skb);
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        addr = *(__be32 *)(skb_network_header(skb) + serr->addr_offset);
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        port = serr->port;
51 
 
52 
        _net("Rx UDP Error from "NIPQUAD_FMT":%hu",
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             NIPQUAD(addr), ntohs(port));
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        _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)) {
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                rxrpc_free_skb(skb);
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                _leave(" [no peer]");
60 
                return;
61 
        }
62 
 
63 
        trans = rxrpc_find_transport(local, peer);
64 
        if (!trans) {
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                rxrpc_put_peer(peer);
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                rxrpc_free_skb(skb);
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                _leave(" [no trans]");
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                return;
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        }
70 
 
71 
        if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP &&
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            serr->ee.ee_type == ICMP_DEST_UNREACH &&
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            serr->ee.ee_code == ICMP_FRAG_NEEDED
74 
            ) {
75 
                u32 mtu = serr->ee.ee_info;
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77 
                _net("Rx Received ICMP Fragmentation Needed (%d)", mtu);
78 
 
79 
                /* wind down the local interface MTU */
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                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 
                        spin_lock_bh(&peer->lock);
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                        peer->mtu = mtu;
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                        peer->maxdata = peer->mtu - peer->hdrsize;
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                        spin_unlock_bh(&peer->lock);
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                        _net("Net MTU %u (maxdata %u)",
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                             peer->mtu, peer->maxdata);
109 
                }
110 
        }
111 
 
112 
        rxrpc_put_peer(peer);
113 
 
114 
        /* pass the transport ref to error_handler to release */
115 
        skb_queue_tail(&trans->error_queue, skb);
116 
        rxrpc_queue_work(&trans->error_handler);
117 
 
118 
        /* reset and regenerate socket error */
119 
        spin_lock_bh(&sk->sk_error_queue.lock);
120 
        sk->sk_err = 0;
121 
        skb = skb_peek(&sk->sk_error_queue);
122 
        if (skb) {
123 
                sk->sk_err = SKB_EXT_ERR(skb)->ee.ee_errno;
124 
                spin_unlock_bh(&sk->sk_error_queue.lock);
125 
                sk->sk_error_report(sk);
126 
        } else {
127 
                spin_unlock_bh(&sk->sk_error_queue.lock);
128 
        }
129 
 
130 
        _leave("");
131 
}
132 
 
133 
/*
134 
 * deal with UDP error messages
135 
 */
136 
void rxrpc_UDP_error_handler(struct work_struct *work)
137 
{
138 
        struct sock_extended_err *ee;
139 
        struct sock_exterr_skb *serr;
140 
        struct rxrpc_transport *trans =
141 
                container_of(work, struct rxrpc_transport, error_handler);
142 
        struct sk_buff *skb;
143 
        int local, err;
144 
 
145 
        _enter("");
146 
 
147 
        skb = skb_dequeue(&trans->error_queue);
148 
        if (!skb)
149 
                return;
150 
 
151 
        serr = SKB_EXT_ERR(skb);
152 
        ee = &serr->ee;
153 
 
154 
        _net("Rx Error o=%d t=%d c=%d e=%d",
155 
             ee->ee_origin, ee->ee_type, ee->ee_code, ee->ee_errno);
156 
 
157 
        err = ee->ee_errno;
158 
 
159 
        switch (ee->ee_origin) {
160 
        case SO_EE_ORIGIN_ICMP:
161 
                local = 0;
162 
                switch (ee->ee_type) {
163 
                case ICMP_DEST_UNREACH:
164 
                        switch (ee->ee_code) {
165 
                        case ICMP_NET_UNREACH:
166 
                                _net("Rx Received ICMP Network Unreachable");
167 
                                err = ENETUNREACH;
168 
                                break;
169 
                        case ICMP_HOST_UNREACH:
170 
                                _net("Rx Received ICMP Host Unreachable");
171 
                                err = EHOSTUNREACH;
172 
                                break;
173 
                        case ICMP_PORT_UNREACH:
174 
                                _net("Rx Received ICMP Port Unreachable");
175 
                                err = ECONNREFUSED;
176 
                                break;
177 
                        case ICMP_FRAG_NEEDED:
178 
                                _net("Rx Received ICMP Fragmentation Needed (%d)",
179 
                                     ee->ee_info);
180 
                                err = 0; /* dealt with elsewhere */
181 
                                break;
182 
                        case ICMP_NET_UNKNOWN:
183 
                                _net("Rx Received ICMP Unknown Network");
184 
                                err = ENETUNREACH;
185 
                                break;
186 
                        case ICMP_HOST_UNKNOWN:
187 
                                _net("Rx Received ICMP Unknown Host");
188 
                                err = EHOSTUNREACH;
189 
                                break;
190 
                        default:
191 
                                _net("Rx Received ICMP DestUnreach code=%u",
192 
                                     ee->ee_code);
193 
                                break;
194 
                        }
195 
                        break;
196 
 
197 
                case ICMP_TIME_EXCEEDED:
198 
                        _net("Rx Received ICMP TTL Exceeded");
199 
                        break;
200 
 
201 
                default:
202 
                        _proto("Rx Received ICMP error { type=%u code=%u }",
203 
                               ee->ee_type, ee->ee_code);
204 
                        break;
205 
                }
206 
                break;
207 
 
208 
        case SO_EE_ORIGIN_LOCAL:
209 
                _proto("Rx Received local error { error=%d }",
210 
                       ee->ee_errno);
211 
                local = 1;
212 
                break;
213 
 
214 
        case SO_EE_ORIGIN_NONE:
215 
        case SO_EE_ORIGIN_ICMP6:
216 
        default:
217 
                _proto("Rx Received error report { orig=%u }",
218 
                       ee->ee_origin);
219 
                local = 0;
220 
                break;
221 
        }
222 
 
223 
        /* terminate all the affected calls if there's an unrecoverable
224 
         * error */
225 
        if (err) {
226 
                struct rxrpc_call *call, *_n;
227 
 
228 
                _debug("ISSUE ERROR %d", err);
229 
 
230 
                spin_lock_bh(&trans->peer->lock);
231 
                trans->peer->net_error = err;
232 
 
233 
                list_for_each_entry_safe(call, _n, &trans->peer->error_targets,
234 
                                         error_link) {
235 
                        write_lock(&call->state_lock);
236 
                        if (call->state != RXRPC_CALL_COMPLETE &&
237 
                            call->state < RXRPC_CALL_NETWORK_ERROR) {
238 
                                call->state = RXRPC_CALL_NETWORK_ERROR;
239 
                                set_bit(RXRPC_CALL_RCVD_ERROR, &call->events);
240 
                                rxrpc_queue_call(call);
241 
                        }
242 
                        write_unlock(&call->state_lock);
243 
                        list_del_init(&call->error_link);
244 
                }
245 
 
246 
                spin_unlock_bh(&trans->peer->lock);
247 
        }
248 
 
249 
        if (!skb_queue_empty(&trans->error_queue))
250 
                rxrpc_queue_work(&trans->error_handler);
251 
 
252 
        rxrpc_free_skb(skb);
253 
        rxrpc_put_transport(trans);
254 
        _leave("");
255 
}

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