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12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/module.h>
15#include <linux/net.h>
16#include <linux/skbuff.h>
17#include <linux/errqueue.h>
18#include <linux/udp.h>
19#include <linux/in.h>
20#include <linux/in6.h>
21#include <linux/icmp.h>
22#include <net/sock.h>
23#include <net/af_rxrpc.h>
24#include <net/ip.h>
25#include "ar-internal.h"
26
27
28
29
30static void rxrpc_abort_calls(struct rxrpc_connection *conn, int state,
31 u32 abort_code)
32{
33 struct rxrpc_call *call;
34 int i;
35
36 _enter("{%d},%x", conn->debug_id, abort_code);
37
38 spin_lock(&conn->channel_lock);
39
40 for (i = 0; i < RXRPC_MAXCALLS; i++) {
41 call = rcu_dereference_protected(
42 conn->channels[i].call,
43 lockdep_is_held(&conn->channel_lock));
44 write_lock_bh(&call->state_lock);
45 if (call->state <= RXRPC_CALL_COMPLETE) {
46 call->state = state;
47 if (state == RXRPC_CALL_LOCALLY_ABORTED) {
48 call->local_abort = conn->local_abort;
49 set_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events);
50 } else {
51 call->remote_abort = conn->remote_abort;
52 set_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events);
53 }
54 rxrpc_queue_call(call);
55 }
56 write_unlock_bh(&call->state_lock);
57 }
58
59 spin_unlock(&conn->channel_lock);
60 _leave("");
61}
62
63
64
65
66static int rxrpc_abort_connection(struct rxrpc_connection *conn,
67 u32 error, u32 abort_code)
68{
69 struct rxrpc_wire_header whdr;
70 struct msghdr msg;
71 struct kvec iov[2];
72 __be32 word;
73 size_t len;
74 u32 serial;
75 int ret;
76
77 _enter("%d,,%u,%u", conn->debug_id, error, abort_code);
78
79
80 spin_lock_bh(&conn->state_lock);
81 if (conn->state < RXRPC_CONN_REMOTELY_ABORTED) {
82 conn->state = RXRPC_CONN_LOCALLY_ABORTED;
83 conn->error = error;
84 spin_unlock_bh(&conn->state_lock);
85 } else {
86 spin_unlock_bh(&conn->state_lock);
87 _leave(" = 0 [already dead]");
88 return 0;
89 }
90
91 rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code);
92
93 msg.msg_name = &conn->params.peer->srx.transport;
94 msg.msg_namelen = conn->params.peer->srx.transport_len;
95 msg.msg_control = NULL;
96 msg.msg_controllen = 0;
97 msg.msg_flags = 0;
98
99 whdr.epoch = htonl(conn->proto.epoch);
100 whdr.cid = htonl(conn->proto.cid);
101 whdr.callNumber = 0;
102 whdr.seq = 0;
103 whdr.type = RXRPC_PACKET_TYPE_ABORT;
104 whdr.flags = conn->out_clientflag;
105 whdr.userStatus = 0;
106 whdr.securityIndex = conn->security_ix;
107 whdr._rsvd = 0;
108 whdr.serviceId = htons(conn->params.service_id);
109
110 word = htonl(conn->local_abort);
111
112 iov[0].iov_base = &whdr;
113 iov[0].iov_len = sizeof(whdr);
114 iov[1].iov_base = &word;
115 iov[1].iov_len = sizeof(word);
116
117 len = iov[0].iov_len + iov[1].iov_len;
118
119 serial = atomic_inc_return(&conn->serial);
120 whdr.serial = htonl(serial);
121 _proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);
122
123 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
124 if (ret < 0) {
125 _debug("sendmsg failed: %d", ret);
126 return -EAGAIN;
127 }
128
129 _leave(" = 0");
130 return 0;
131}
132
133
134
135
136
137static void rxrpc_call_is_secure(struct rxrpc_call *call)
138{
139 _enter("%p", call);
140 if (call) {
141 read_lock(&call->state_lock);
142 if (call->state < RXRPC_CALL_COMPLETE &&
143 !test_and_set_bit(RXRPC_CALL_EV_SECURED, &call->events))
144 rxrpc_queue_call(call);
145 read_unlock(&call->state_lock);
146 }
147}
148
149
150
151
152static int rxrpc_process_event(struct rxrpc_connection *conn,
153 struct sk_buff *skb,
154 u32 *_abort_code)
155{
156 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
157 __be32 wtmp;
158 u32 abort_code;
159 int loop, ret;
160
161 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
162 kleave(" = -ECONNABORTED [%u]", conn->state);
163 return -ECONNABORTED;
164 }
165
166 _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
167
168 switch (sp->hdr.type) {
169 case RXRPC_PACKET_TYPE_ABORT:
170 if (skb_copy_bits(skb, 0, &wtmp, sizeof(wtmp)) < 0)
171 return -EPROTO;
172 abort_code = ntohl(wtmp);
173 _proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
174
175 conn->state = RXRPC_CONN_REMOTELY_ABORTED;
176 rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
177 abort_code);
178 return -ECONNABORTED;
179
180 case RXRPC_PACKET_TYPE_CHALLENGE:
181 return conn->security->respond_to_challenge(conn, skb,
182 _abort_code);
183
184 case RXRPC_PACKET_TYPE_RESPONSE:
185 ret = conn->security->verify_response(conn, skb, _abort_code);
186 if (ret < 0)
187 return ret;
188
189 ret = conn->security->init_connection_security(conn);
190 if (ret < 0)
191 return ret;
192
193 ret = conn->security->prime_packet_security(conn);
194 if (ret < 0)
195 return ret;
196
197 spin_lock(&conn->channel_lock);
198 spin_lock(&conn->state_lock);
199
200 if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
201 conn->state = RXRPC_CONN_SERVICE;
202 for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
203 rxrpc_call_is_secure(
204 rcu_dereference_protected(
205 conn->channels[loop].call,
206 lockdep_is_held(&conn->channel_lock)));
207 }
208
209 spin_unlock(&conn->state_lock);
210 spin_unlock(&conn->channel_lock);
211 return 0;
212
213 default:
214 _leave(" = -EPROTO [%u]", sp->hdr.type);
215 return -EPROTO;
216 }
217}
218
219
220
221
222static void rxrpc_secure_connection(struct rxrpc_connection *conn)
223{
224 u32 abort_code;
225 int ret;
226
227 _enter("{%d}", conn->debug_id);
228
229 ASSERT(conn->security_ix != 0);
230
231 if (!conn->params.key) {
232 _debug("set up security");
233 ret = rxrpc_init_server_conn_security(conn);
234 switch (ret) {
235 case 0:
236 break;
237 case -ENOENT:
238 abort_code = RX_CALL_DEAD;
239 goto abort;
240 default:
241 abort_code = RXKADNOAUTH;
242 goto abort;
243 }
244 }
245
246 if (conn->security->issue_challenge(conn) < 0) {
247 abort_code = RX_CALL_DEAD;
248 ret = -ENOMEM;
249 goto abort;
250 }
251
252 _leave("");
253 return;
254
255abort:
256 _debug("abort %d, %d", ret, abort_code);
257 rxrpc_abort_connection(conn, -ret, abort_code);
258 _leave(" [aborted]");
259}
260
261
262
263
264void rxrpc_process_connection(struct work_struct *work)
265{
266 struct rxrpc_connection *conn =
267 container_of(work, struct rxrpc_connection, processor);
268 struct sk_buff *skb;
269 u32 abort_code = RX_PROTOCOL_ERROR;
270 int ret;
271
272 _enter("{%d}", conn->debug_id);
273
274 if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
275 rxrpc_secure_connection(conn);
276
277
278
279 while ((skb = skb_dequeue(&conn->rx_queue))) {
280 ret = rxrpc_process_event(conn, skb, &abort_code);
281 switch (ret) {
282 case -EPROTO:
283 case -EKEYEXPIRED:
284 case -EKEYREJECTED:
285 goto protocol_error;
286 case -EAGAIN:
287 goto requeue_and_leave;
288 case -ECONNABORTED:
289 default:
290 rxrpc_free_skb(skb);
291 break;
292 }
293 }
294
295out:
296 rxrpc_put_connection(conn);
297 _leave("");
298 return;
299
300requeue_and_leave:
301 skb_queue_head(&conn->rx_queue, skb);
302 goto out;
303
304protocol_error:
305 if (rxrpc_abort_connection(conn, -ret, abort_code) < 0)
306 goto requeue_and_leave;
307 rxrpc_free_skb(skb);
308 _leave(" [EPROTO]");
309 goto out;
310}
311
312
313
314
315void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
316{
317 CHECK_SLAB_OKAY(&local->usage);
318
319 skb_queue_tail(&local->reject_queue, skb);
320 rxrpc_queue_local(local);
321}
322
323
324
325
326void rxrpc_reject_packets(struct rxrpc_local *local)
327{
328 union {
329 struct sockaddr sa;
330 struct sockaddr_in sin;
331 } sa;
332 struct rxrpc_skb_priv *sp;
333 struct rxrpc_wire_header whdr;
334 struct sk_buff *skb;
335 struct msghdr msg;
336 struct kvec iov[2];
337 size_t size;
338 __be32 code;
339
340 _enter("%d", local->debug_id);
341
342 iov[0].iov_base = &whdr;
343 iov[0].iov_len = sizeof(whdr);
344 iov[1].iov_base = &code;
345 iov[1].iov_len = sizeof(code);
346 size = sizeof(whdr) + sizeof(code);
347
348 msg.msg_name = &sa;
349 msg.msg_control = NULL;
350 msg.msg_controllen = 0;
351 msg.msg_flags = 0;
352
353 memset(&sa, 0, sizeof(sa));
354 sa.sa.sa_family = local->srx.transport.family;
355 switch (sa.sa.sa_family) {
356 case AF_INET:
357 msg.msg_namelen = sizeof(sa.sin);
358 break;
359 default:
360 msg.msg_namelen = 0;
361 break;
362 }
363
364 memset(&whdr, 0, sizeof(whdr));
365 whdr.type = RXRPC_PACKET_TYPE_ABORT;
366
367 while ((skb = skb_dequeue(&local->reject_queue))) {
368 sp = rxrpc_skb(skb);
369 switch (sa.sa.sa_family) {
370 case AF_INET:
371 sa.sin.sin_port = udp_hdr(skb)->source;
372 sa.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
373 code = htonl(skb->priority);
374
375 whdr.epoch = htonl(sp->hdr.epoch);
376 whdr.cid = htonl(sp->hdr.cid);
377 whdr.callNumber = htonl(sp->hdr.callNumber);
378 whdr.serviceId = htons(sp->hdr.serviceId);
379 whdr.flags = sp->hdr.flags;
380 whdr.flags ^= RXRPC_CLIENT_INITIATED;
381 whdr.flags &= RXRPC_CLIENT_INITIATED;
382
383 kernel_sendmsg(local->socket, &msg, iov, 2, size);
384 break;
385
386 default:
387 break;
388 }
389
390 rxrpc_free_skb(skb);
391 }
392
393 _leave("");
394}
395
