summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--include/linux/socket.h6
-rw-r--r--include/net/kcm.h125
-rw-r--r--include/uapi/linux/kcm.h40
-rw-r--r--net/Kconfig1
-rw-r--r--net/Makefile1
-rw-r--r--net/kcm/Kconfig10
-rw-r--r--net/kcm/Makefile3
-rw-r--r--net/kcm/kcmsock.c2016
8 files changed, 2201 insertions, 1 deletions
diff --git a/include/linux/socket.h b/include/linux/socket.h
index d834af22a460..73bf6c6a833b 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -200,7 +200,9 @@ struct ucred {
200#define AF_ALG 38 /* Algorithm sockets */ 200#define AF_ALG 38 /* Algorithm sockets */
201#define AF_NFC 39 /* NFC sockets */ 201#define AF_NFC 39 /* NFC sockets */
202#define AF_VSOCK 40 /* vSockets */ 202#define AF_VSOCK 40 /* vSockets */
203#define AF_MAX 41 /* For now.. */ 203#define AF_KCM 41 /* Kernel Connection Multiplexor*/
204
205#define AF_MAX 42 /* For now.. */
204 206
205/* Protocol families, same as address families. */ 207/* Protocol families, same as address families. */
206#define PF_UNSPEC AF_UNSPEC 208#define PF_UNSPEC AF_UNSPEC
@@ -246,6 +248,7 @@ struct ucred {
246#define PF_ALG AF_ALG 248#define PF_ALG AF_ALG
247#define PF_NFC AF_NFC 249#define PF_NFC AF_NFC
248#define PF_VSOCK AF_VSOCK 250#define PF_VSOCK AF_VSOCK
251#define PF_KCM AF_KCM
249#define PF_MAX AF_MAX 252#define PF_MAX AF_MAX
250 253
251/* Maximum queue length specifiable by listen. */ 254/* Maximum queue length specifiable by listen. */
@@ -323,6 +326,7 @@ struct ucred {
323#define SOL_CAIF 278 326#define SOL_CAIF 278
324#define SOL_ALG 279 327#define SOL_ALG 279
325#define SOL_NFC 280 328#define SOL_NFC 280
329#define SOL_KCM 281
326 330
327/* IPX options */ 331/* IPX options */
328#define IPX_TYPE 1 332#define IPX_TYPE 1
diff --git a/include/net/kcm.h b/include/net/kcm.h
new file mode 100644
index 000000000000..1bcae39070ec
--- /dev/null
+++ b/include/net/kcm.h
@@ -0,0 +1,125 @@
1/*
2 * Kernel Connection Multiplexor
3 *
4 * Copyright (c) 2016 Tom Herbert <tom@herbertland.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
9 */
10
11#ifndef __NET_KCM_H_
12#define __NET_KCM_H_
13
14#include <linux/skbuff.h>
15#include <net/sock.h>
16#include <uapi/linux/kcm.h>
17
18extern unsigned int kcm_net_id;
19
20struct kcm_tx_msg {
21 unsigned int sent;
22 unsigned int fragidx;
23 unsigned int frag_offset;
24 unsigned int msg_flags;
25 struct sk_buff *frag_skb;
26 struct sk_buff *last_skb;
27};
28
29struct kcm_rx_msg {
30 int full_len;
31 int accum_len;
32 int offset;
33};
34
35/* Socket structure for KCM client sockets */
36struct kcm_sock {
37 struct sock sk;
38 struct kcm_mux *mux;
39 struct list_head kcm_sock_list;
40 int index;
41 u32 done : 1;
42 struct work_struct done_work;
43
44 /* Transmit */
45 struct kcm_psock *tx_psock;
46 struct work_struct tx_work;
47 struct list_head wait_psock_list;
48 struct sk_buff *seq_skb;
49
50 /* Don't use bit fields here, these are set under different locks */
51 bool tx_wait;
52 bool tx_wait_more;
53
54 /* Receive */
55 struct kcm_psock *rx_psock;
56 struct list_head wait_rx_list; /* KCMs waiting for receiving */
57 bool rx_wait;
58 u32 rx_disabled : 1;
59};
60
61struct bpf_prog;
62
63/* Structure for an attached lower socket */
64struct kcm_psock {
65 struct sock *sk;
66 struct kcm_mux *mux;
67 int index;
68
69 u32 tx_stopped : 1;
70 u32 rx_stopped : 1;
71 u32 done : 1;
72 u32 unattaching : 1;
73
74 void (*save_state_change)(struct sock *sk);
75 void (*save_data_ready)(struct sock *sk);
76 void (*save_write_space)(struct sock *sk);
77
78 struct list_head psock_list;
79
80 /* Receive */
81 struct sk_buff *rx_skb_head;
82 struct sk_buff **rx_skb_nextp;
83 struct sk_buff *ready_rx_msg;
84 struct list_head psock_ready_list;
85 struct work_struct rx_work;
86 struct delayed_work rx_delayed_work;
87 struct bpf_prog *bpf_prog;
88 struct kcm_sock *rx_kcm;
89
90 /* Transmit */
91 struct kcm_sock *tx_kcm;
92 struct list_head psock_avail_list;
93};
94
95/* Per net MUX list */
96struct kcm_net {
97 struct mutex mutex;
98 struct list_head mux_list;
99 int count;
100};
101
102/* Structure for a MUX */
103struct kcm_mux {
104 struct list_head kcm_mux_list;
105 struct rcu_head rcu;
106 struct kcm_net *knet;
107
108 struct list_head kcm_socks; /* All KCM sockets on MUX */
109 int kcm_socks_cnt; /* Total KCM socket count for MUX */
110 struct list_head psocks; /* List of all psocks on MUX */
111 int psocks_cnt; /* Total attached sockets */
112
113 /* Receive */
114 spinlock_t rx_lock ____cacheline_aligned_in_smp;
115 struct list_head kcm_rx_waiters; /* KCMs waiting for receiving */
116 struct list_head psocks_ready; /* List of psocks with a msg ready */
117 struct sk_buff_head rx_hold_queue;
118
119 /* Transmit */
120 spinlock_t lock ____cacheline_aligned_in_smp; /* TX and mux locking */
121 struct list_head psocks_avail; /* List of available psocks */
122 struct list_head kcm_tx_waiters; /* KCMs waiting for a TX psock */
123};
124
125#endif /* __NET_KCM_H_ */
diff --git a/include/uapi/linux/kcm.h b/include/uapi/linux/kcm.h
new file mode 100644
index 000000000000..a5a530940b99
--- /dev/null
+++ b/include/uapi/linux/kcm.h
@@ -0,0 +1,40 @@
1/*
2 * Kernel Connection Multiplexor
3 *
4 * Copyright (c) 2016 Tom Herbert <tom@herbertland.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
9 *
10 * User API to clone KCM sockets and attach transport socket to a KCM
11 * multiplexor.
12 */
13
14#ifndef KCM_KERNEL_H
15#define KCM_KERNEL_H
16
17struct kcm_attach {
18 int fd;
19 int bpf_fd;
20};
21
22struct kcm_unattach {
23 int fd;
24};
25
26struct kcm_clone {
27 int fd;
28};
29
30#define SIOCKCMATTACH (SIOCPROTOPRIVATE + 0)
31#define SIOCKCMUNATTACH (SIOCPROTOPRIVATE + 1)
32#define SIOCKCMCLONE (SIOCPROTOPRIVATE + 2)
33
34#define KCMPROTO_CONNECTED 0
35
36/* Socket options */
37#define KCM_RECV_DISABLE 1
38
39#endif
40
diff --git a/net/Kconfig b/net/Kconfig
index 2760825e53fa..10640d5f8bee 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -360,6 +360,7 @@ source "net/can/Kconfig"
360source "net/irda/Kconfig" 360source "net/irda/Kconfig"
361source "net/bluetooth/Kconfig" 361source "net/bluetooth/Kconfig"
362source "net/rxrpc/Kconfig" 362source "net/rxrpc/Kconfig"
363source "net/kcm/Kconfig"
363 364
364config FIB_RULES 365config FIB_RULES
365 bool 366 bool
diff --git a/net/Makefile b/net/Makefile
index a5d04098dfce..81d14119eab5 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_IRDA) += irda/
34obj-$(CONFIG_BT) += bluetooth/ 34obj-$(CONFIG_BT) += bluetooth/
35obj-$(CONFIG_SUNRPC) += sunrpc/ 35obj-$(CONFIG_SUNRPC) += sunrpc/
36obj-$(CONFIG_AF_RXRPC) += rxrpc/ 36obj-$(CONFIG_AF_RXRPC) += rxrpc/
37obj-$(CONFIG_AF_KCM) += kcm/
37obj-$(CONFIG_ATM) += atm/ 38obj-$(CONFIG_ATM) += atm/
38obj-$(CONFIG_L2TP) += l2tp/ 39obj-$(CONFIG_L2TP) += l2tp/
39obj-$(CONFIG_DECNET) += decnet/ 40obj-$(CONFIG_DECNET) += decnet/
diff --git a/net/kcm/Kconfig b/net/kcm/Kconfig
new file mode 100644
index 000000000000..5db94d940ecc
--- /dev/null
+++ b/net/kcm/Kconfig
@@ -0,0 +1,10 @@
1
2config AF_KCM
3 tristate "KCM sockets"
4 depends on INET
5 select BPF_SYSCALL
6 ---help---
7 KCM (Kernel Connection Multiplexor) sockets provide a method
8 for multiplexing messages of a message based application
9 protocol over kernel connectons (e.g. TCP connections).
10
diff --git a/net/kcm/Makefile b/net/kcm/Makefile
new file mode 100644
index 000000000000..cb525f7c5a13
--- /dev/null
+++ b/net/kcm/Makefile
@@ -0,0 +1,3 @@
1obj-$(CONFIG_AF_KCM) += kcm.o
2
3kcm-y := kcmsock.o
diff --git a/net/kcm/kcmsock.c b/net/kcm/kcmsock.c
new file mode 100644
index 000000000000..30ef69ac6b81
--- /dev/null
+++ b/net/kcm/kcmsock.c
@@ -0,0 +1,2016 @@
1#include <linux/bpf.h>
2#include <linux/errno.h>
3#include <linux/errqueue.h>
4#include <linux/file.h>
5#include <linux/in.h>
6#include <linux/kernel.h>
7#include <linux/module.h>
8#include <linux/net.h>
9#include <linux/netdevice.h>
10#include <linux/poll.h>
11#include <linux/rculist.h>
12#include <linux/skbuff.h>
13#include <linux/socket.h>
14#include <linux/uaccess.h>
15#include <linux/workqueue.h>
16#include <net/kcm.h>
17#include <net/netns/generic.h>
18#include <net/sock.h>
19#include <net/tcp.h>
20#include <uapi/linux/kcm.h>
21
22unsigned int kcm_net_id;
23
24static struct kmem_cache *kcm_psockp __read_mostly;
25static struct kmem_cache *kcm_muxp __read_mostly;
26static struct workqueue_struct *kcm_wq;
27
28static inline struct kcm_sock *kcm_sk(const struct sock *sk)
29{
30 return (struct kcm_sock *)sk;
31}
32
33static inline struct kcm_tx_msg *kcm_tx_msg(struct sk_buff *skb)
34{
35 return (struct kcm_tx_msg *)skb->cb;
36}
37
38static inline struct kcm_rx_msg *kcm_rx_msg(struct sk_buff *skb)
39{
40 return (struct kcm_rx_msg *)((void *)skb->cb +
41 offsetof(struct qdisc_skb_cb, data));
42}
43
44static void report_csk_error(struct sock *csk, int err)
45{
46 csk->sk_err = EPIPE;
47 csk->sk_error_report(csk);
48}
49
50/* Callback lock held */
51static void kcm_abort_rx_psock(struct kcm_psock *psock, int err,
52 struct sk_buff *skb)
53{
54 struct sock *csk = psock->sk;
55
56 /* Unrecoverable error in receive */
57
58 if (psock->rx_stopped)
59 return;
60
61 psock->rx_stopped = 1;
62
63 /* Report an error on the lower socket */
64 report_csk_error(csk, err);
65}
66
67static void kcm_abort_tx_psock(struct kcm_psock *psock, int err,
68 bool wakeup_kcm)
69{
70 struct sock *csk = psock->sk;
71 struct kcm_mux *mux = psock->mux;
72
73 /* Unrecoverable error in transmit */
74
75 spin_lock_bh(&mux->lock);
76
77 if (psock->tx_stopped) {
78 spin_unlock_bh(&mux->lock);
79 return;
80 }
81
82 psock->tx_stopped = 1;
83
84 if (!psock->tx_kcm) {
85 /* Take off psocks_avail list */
86 list_del(&psock->psock_avail_list);
87 } else if (wakeup_kcm) {
88 /* In this case psock is being aborted while outside of
89 * write_msgs and psock is reserved. Schedule tx_work
90 * to handle the failure there. Need to commit tx_stopped
91 * before queuing work.
92 */
93 smp_mb();
94
95 queue_work(kcm_wq, &psock->tx_kcm->tx_work);
96 }
97
98 spin_unlock_bh(&mux->lock);
99
100 /* Report error on lower socket */
101 report_csk_error(csk, err);
102}
103
104static int kcm_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
105
106/* KCM is ready to receive messages on its queue-- either the KCM is new or
107 * has become unblocked after being blocked on full socket buffer. Queue any
108 * pending ready messages on a psock. RX mux lock held.
109 */
110static void kcm_rcv_ready(struct kcm_sock *kcm)
111{
112 struct kcm_mux *mux = kcm->mux;
113 struct kcm_psock *psock;
114 struct sk_buff *skb;
115
116 if (unlikely(kcm->rx_wait || kcm->rx_psock || kcm->rx_disabled))
117 return;
118
119 while (unlikely((skb = __skb_dequeue(&mux->rx_hold_queue)))) {
120 if (kcm_queue_rcv_skb(&kcm->sk, skb)) {
121 /* Assuming buffer limit has been reached */
122 skb_queue_head(&mux->rx_hold_queue, skb);
123 WARN_ON(!sk_rmem_alloc_get(&kcm->sk));
124 return;
125 }
126 }
127
128 while (!list_empty(&mux->psocks_ready)) {
129 psock = list_first_entry(&mux->psocks_ready, struct kcm_psock,
130 psock_ready_list);
131
132 if (kcm_queue_rcv_skb(&kcm->sk, psock->ready_rx_msg)) {
133 /* Assuming buffer limit has been reached */
134 WARN_ON(!sk_rmem_alloc_get(&kcm->sk));
135 return;
136 }
137
138 /* Consumed the ready message on the psock. Schedule rx_work to
139 * get more messages.
140 */
141 list_del(&psock->psock_ready_list);
142 psock->ready_rx_msg = NULL;
143
144 /* Commit clearing of ready_rx_msg for queuing work */
145 smp_mb();
146
147 queue_work(kcm_wq, &psock->rx_work);
148 }
149
150 /* Buffer limit is okay now, add to ready list */
151 list_add_tail(&kcm->wait_rx_list,
152 &kcm->mux->kcm_rx_waiters);
153 kcm->rx_wait = true;
154}
155
156static void kcm_rfree(struct sk_buff *skb)
157{
158 struct sock *sk = skb->sk;
159 struct kcm_sock *kcm = kcm_sk(sk);
160 struct kcm_mux *mux = kcm->mux;
161 unsigned int len = skb->truesize;
162
163 sk_mem_uncharge(sk, len);
164 atomic_sub(len, &sk->sk_rmem_alloc);
165
166 /* For reading rx_wait and rx_psock without holding lock */
167 smp_mb__after_atomic();
168
169 if (!kcm->rx_wait && !kcm->rx_psock &&
170 sk_rmem_alloc_get(sk) < sk->sk_rcvlowat) {
171 spin_lock_bh(&mux->rx_lock);
172 kcm_rcv_ready(kcm);
173 spin_unlock_bh(&mux->rx_lock);
174 }
175}
176
177static int kcm_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
178{
179 struct sk_buff_head *list = &sk->sk_receive_queue;
180
181 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
182 return -ENOMEM;
183
184 if (!sk_rmem_schedule(sk, skb, skb->truesize))
185 return -ENOBUFS;
186
187 skb->dev = NULL;
188
189 skb_orphan(skb);
190 skb->sk = sk;
191 skb->destructor = kcm_rfree;
192 atomic_add(skb->truesize, &sk->sk_rmem_alloc);
193 sk_mem_charge(sk, skb->truesize);
194
195 skb_queue_tail(list, skb);
196
197 if (!sock_flag(sk, SOCK_DEAD))
198 sk->sk_data_ready(sk);
199
200 return 0;
201}
202
203/* Requeue received messages for a kcm socket to other kcm sockets. This is
204 * called with a kcm socket is receive disabled.
205 * RX mux lock held.
206 */
207static void requeue_rx_msgs(struct kcm_mux *mux, struct sk_buff_head *head)
208{
209 struct sk_buff *skb;
210 struct kcm_sock *kcm;
211
212 while ((skb = __skb_dequeue(head))) {
213 /* Reset destructor to avoid calling kcm_rcv_ready */
214 skb->destructor = sock_rfree;
215 skb_orphan(skb);
216try_again:
217 if (list_empty(&mux->kcm_rx_waiters)) {
218 skb_queue_tail(&mux->rx_hold_queue, skb);
219 continue;
220 }
221
222 kcm = list_first_entry(&mux->kcm_rx_waiters,
223 struct kcm_sock, wait_rx_list);
224
225 if (kcm_queue_rcv_skb(&kcm->sk, skb)) {
226 /* Should mean socket buffer full */
227 list_del(&kcm->wait_rx_list);
228 kcm->rx_wait = false;
229
230 /* Commit rx_wait to read in kcm_free */
231 smp_wmb();
232
233 goto try_again;
234 }
235 }
236}
237
238/* Lower sock lock held */
239static struct kcm_sock *reserve_rx_kcm(struct kcm_psock *psock,
240 struct sk_buff *head)
241{
242 struct kcm_mux *mux = psock->mux;
243 struct kcm_sock *kcm;
244
245 WARN_ON(psock->ready_rx_msg);
246
247 if (psock->rx_kcm)
248 return psock->rx_kcm;
249
250 spin_lock_bh(&mux->rx_lock);
251
252 if (psock->rx_kcm) {
253 spin_unlock_bh(&mux->rx_lock);
254 return psock->rx_kcm;
255 }
256
257 if (list_empty(&mux->kcm_rx_waiters)) {
258 psock->ready_rx_msg = head;
259 list_add_tail(&psock->psock_ready_list,
260 &mux->psocks_ready);
261 spin_unlock_bh(&mux->rx_lock);
262 return NULL;
263 }
264
265 kcm = list_first_entry(&mux->kcm_rx_waiters,
266 struct kcm_sock, wait_rx_list);
267 list_del(&kcm->wait_rx_list);
268 kcm->rx_wait = false;
269
270 psock->rx_kcm = kcm;
271 kcm->rx_psock = psock;
272
273 spin_unlock_bh(&mux->rx_lock);
274
275 return kcm;
276}
277
278static void kcm_done(struct kcm_sock *kcm);
279
280static void kcm_done_work(struct work_struct *w)
281{
282 kcm_done(container_of(w, struct kcm_sock, done_work));
283}
284
285/* Lower sock held */
286static void unreserve_rx_kcm(struct kcm_psock *psock,
287 bool rcv_ready)
288{
289 struct kcm_sock *kcm = psock->rx_kcm;
290 struct kcm_mux *mux = psock->mux;
291
292 if (!kcm)
293 return;
294
295 spin_lock_bh(&mux->rx_lock);
296
297 psock->rx_kcm = NULL;
298 kcm->rx_psock = NULL;
299
300 /* Commit kcm->rx_psock before sk_rmem_alloc_get to sync with
301 * kcm_rfree
302 */
303 smp_mb();
304
305 if (unlikely(kcm->done)) {
306 spin_unlock_bh(&mux->rx_lock);
307
308 /* Need to run kcm_done in a task since we need to qcquire
309 * callback locks which may already be held here.
310 */
311 INIT_WORK(&kcm->done_work, kcm_done_work);
312 schedule_work(&kcm->done_work);
313 return;
314 }
315
316 if (unlikely(kcm->rx_disabled)) {
317 requeue_rx_msgs(mux, &kcm->sk.sk_receive_queue);
318 } else if (rcv_ready || unlikely(!sk_rmem_alloc_get(&kcm->sk))) {
319 /* Check for degenerative race with rx_wait that all
320 * data was dequeued (accounted for in kcm_rfree).
321 */
322 kcm_rcv_ready(kcm);
323 }
324 spin_unlock_bh(&mux->rx_lock);
325}
326
327/* Macro to invoke filter function. */
328#define KCM_RUN_FILTER(prog, ctx) \
329 (*prog->bpf_func)(ctx, prog->insnsi)
330
331/* Lower socket lock held */
332static int kcm_tcp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
333 unsigned int orig_offset, size_t orig_len)
334{
335 struct kcm_psock *psock = (struct kcm_psock *)desc->arg.data;
336 struct kcm_rx_msg *rxm;
337 struct kcm_sock *kcm;
338 struct sk_buff *head, *skb;
339 size_t eaten = 0, cand_len;
340 ssize_t extra;
341 int err;
342 bool cloned_orig = false;
343
344 if (psock->ready_rx_msg)
345 return 0;
346
347 head = psock->rx_skb_head;
348 if (head) {
349 /* Message already in progress */
350
351 if (unlikely(orig_offset)) {
352 /* Getting data with a non-zero offset when a message is
353 * in progress is not expected. If it does happen, we
354 * need to clone and pull since we can't deal with
355 * offsets in the skbs for a message expect in the head.
356 */
357 orig_skb = skb_clone(orig_skb, GFP_ATOMIC);
358 if (!orig_skb) {
359 desc->error = -ENOMEM;
360 return 0;
361 }
362 if (!pskb_pull(orig_skb, orig_offset)) {
363 kfree_skb(orig_skb);
364 desc->error = -ENOMEM;
365 return 0;
366 }
367 cloned_orig = true;
368 orig_offset = 0;
369 }
370
371 if (!psock->rx_skb_nextp) {
372 /* We are going to append to the frags_list of head.
373 * Need to unshare the frag_list.
374 */
375 err = skb_unclone(head, GFP_ATOMIC);
376 if (err) {
377 desc->error = err;
378 return 0;
379 }
380
381 if (unlikely(skb_shinfo(head)->frag_list)) {
382 /* We can't append to an sk_buff that already
383 * has a frag_list. We create a new head, point
384 * the frag_list of that to the old head, and
385 * then are able to use the old head->next for
386 * appending to the message.
387 */
388 if (WARN_ON(head->next)) {
389 desc->error = -EINVAL;
390 return 0;
391 }
392
393 skb = alloc_skb(0, GFP_ATOMIC);
394 if (!skb) {
395 desc->error = -ENOMEM;
396 return 0;
397 }
398 skb->len = head->len;
399 skb->data_len = head->len;
400 skb->truesize = head->truesize;
401 *kcm_rx_msg(skb) = *kcm_rx_msg(head);
402 psock->rx_skb_nextp = &head->next;
403 skb_shinfo(skb)->frag_list = head;
404 psock->rx_skb_head = skb;
405 head = skb;
406 } else {
407 psock->rx_skb_nextp =
408 &skb_shinfo(head)->frag_list;
409 }
410 }
411 }
412
413 while (eaten < orig_len) {
414 /* Always clone since we will consume something */
415 skb = skb_clone(orig_skb, GFP_ATOMIC);
416 if (!skb) {
417 desc->error = -ENOMEM;
418 break;
419 }
420
421 cand_len = orig_len - eaten;
422
423 head = psock->rx_skb_head;
424 if (!head) {
425 head = skb;
426 psock->rx_skb_head = head;
427 /* Will set rx_skb_nextp on next packet if needed */
428 psock->rx_skb_nextp = NULL;
429 rxm = kcm_rx_msg(head);
430 memset(rxm, 0, sizeof(*rxm));
431 rxm->offset = orig_offset + eaten;
432 } else {
433 /* Unclone since we may be appending to an skb that we
434 * already share a frag_list with.
435 */
436 err = skb_unclone(skb, GFP_ATOMIC);
437 if (err) {
438 desc->error = err;
439 break;
440 }
441
442 rxm = kcm_rx_msg(head);
443 *psock->rx_skb_nextp = skb;
444 psock->rx_skb_nextp = &skb->next;
445 head->data_len += skb->len;
446 head->len += skb->len;
447 head->truesize += skb->truesize;
448 }
449
450 if (!rxm->full_len) {
451 ssize_t len;
452
453 len = KCM_RUN_FILTER(psock->bpf_prog, head);
454
455 if (!len) {
456 /* Need more header to determine length */
457 rxm->accum_len += cand_len;
458 eaten += cand_len;
459 WARN_ON(eaten != orig_len);
460 break;
461 } else if (len <= (ssize_t)head->len -
462 skb->len - rxm->offset) {
463 /* Length must be into new skb (and also
464 * greater than zero)
465 */
466 desc->error = -EPROTO;
467 psock->rx_skb_head = NULL;
468 kcm_abort_rx_psock(psock, EPROTO, head);
469 break;
470 }
471
472 rxm->full_len = len;
473 }
474
475 extra = (ssize_t)(rxm->accum_len + cand_len) - rxm->full_len;
476
477 if (extra < 0) {
478 /* Message not complete yet. */
479 rxm->accum_len += cand_len;
480 eaten += cand_len;
481 WARN_ON(eaten != orig_len);
482 break;
483 }
484
485 /* Positive extra indicates ore bytes than needed for the
486 * message
487 */
488
489 WARN_ON(extra > cand_len);
490
491 eaten += (cand_len - extra);
492
493 /* Hurray, we have a new message! */
494 psock->rx_skb_head = NULL;
495
496try_queue:
497 kcm = reserve_rx_kcm(psock, head);
498 if (!kcm) {
499 /* Unable to reserve a KCM, message is held in psock. */
500 break;
501 }
502
503 if (kcm_queue_rcv_skb(&kcm->sk, head)) {
504 /* Should mean socket buffer full */
505 unreserve_rx_kcm(psock, false);
506 goto try_queue;
507 }
508 }
509
510 if (cloned_orig)
511 kfree_skb(orig_skb);
512
513 return eaten;
514}
515
516/* Called with lock held on lower socket */
517static int psock_tcp_read_sock(struct kcm_psock *psock)
518{
519 read_descriptor_t desc;
520
521 desc.arg.data = psock;
522 desc.error = 0;
523 desc.count = 1; /* give more than one skb per call */
524
525 /* sk should be locked here, so okay to do tcp_read_sock */
526 tcp_read_sock(psock->sk, &desc, kcm_tcp_recv);
527
528 unreserve_rx_kcm(psock, true);
529
530 return desc.error;
531}
532
533/* Lower sock lock held */
534static void psock_tcp_data_ready(struct sock *sk)
535{
536 struct kcm_psock *psock;
537
538 read_lock_bh(&sk->sk_callback_lock);
539
540 psock = (struct kcm_psock *)sk->sk_user_data;
541 if (unlikely(!psock || psock->rx_stopped))
542 goto out;
543
544 if (psock->ready_rx_msg)
545 goto out;
546
547 if (psock_tcp_read_sock(psock) == -ENOMEM)
548 queue_delayed_work(kcm_wq, &psock->rx_delayed_work, 0);
549
550out:
551 read_unlock_bh(&sk->sk_callback_lock);
552}
553
554static void do_psock_rx_work(struct kcm_psock *psock)
555{
556 read_descriptor_t rd_desc;
557 struct sock *csk = psock->sk;
558
559 /* We need the read lock to synchronize with psock_tcp_data_ready. We
560 * need the socket lock for calling tcp_read_sock.
561 */
562 lock_sock(csk);
563 read_lock_bh(&csk->sk_callback_lock);
564
565 if (unlikely(csk->sk_user_data != psock))
566 goto out;
567
568 if (unlikely(psock->rx_stopped))
569 goto out;
570
571 if (psock->ready_rx_msg)
572 goto out;
573
574 rd_desc.arg.data = psock;
575
576 if (psock_tcp_read_sock(psock) == -ENOMEM)
577 queue_delayed_work(kcm_wq, &psock->rx_delayed_work, 0);
578
579out:
580 read_unlock_bh(&csk->sk_callback_lock);
581 release_sock(csk);
582}
583
584static void psock_rx_work(struct work_struct *w)
585{
586 do_psock_rx_work(container_of(w, struct kcm_psock, rx_work));
587}
588
589static void psock_rx_delayed_work(struct work_struct *w)
590{
591 do_psock_rx_work(container_of(w, struct kcm_psock,
592 rx_delayed_work.work));
593}
594
595static void psock_tcp_state_change(struct sock *sk)
596{
597 /* TCP only does a POLLIN for a half close. Do a POLLHUP here
598 * since application will normally not poll with POLLIN
599 * on the TCP sockets.
600 */
601
602 report_csk_error(sk, EPIPE);
603}
604
605static void psock_tcp_write_space(struct sock *sk)
606{
607 struct kcm_psock *psock;
608 struct kcm_mux *mux;
609 struct kcm_sock *kcm;
610
611 read_lock_bh(&sk->sk_callback_lock);
612
613 psock = (struct kcm_psock *)sk->sk_user_data;
614 if (unlikely(!psock))
615 goto out;
616
617 mux = psock->mux;
618
619 spin_lock_bh(&mux->lock);
620
621 /* Check if the socket is reserved so someone is waiting for sending. */
622 kcm = psock->tx_kcm;
623 if (kcm)
624 queue_work(kcm_wq, &kcm->tx_work);
625
626 spin_unlock_bh(&mux->lock);
627out:
628 read_unlock_bh(&sk->sk_callback_lock);
629}
630
631static void unreserve_psock(struct kcm_sock *kcm);
632
633/* kcm sock is locked. */
634static struct kcm_psock *reserve_psock(struct kcm_sock *kcm)
635{
636 struct kcm_mux *mux = kcm->mux;
637 struct kcm_psock *psock;
638
639 psock = kcm->tx_psock;
640
641 smp_rmb(); /* Must read tx_psock before tx_wait */
642
643 if (psock) {
644 WARN_ON(kcm->tx_wait);
645 if (unlikely(psock->tx_stopped))
646 unreserve_psock(kcm);
647 else
648 return kcm->tx_psock;
649 }
650
651 spin_lock_bh(&mux->lock);
652
653 /* Check again under lock to see if psock was reserved for this
654 * psock via psock_unreserve.
655 */
656 psock = kcm->tx_psock;
657 if (unlikely(psock)) {
658 WARN_ON(kcm->tx_wait);
659 spin_unlock_bh(&mux->lock);
660 return kcm->tx_psock;
661 }
662
663 if (!list_empty(&mux->psocks_avail)) {
664 psock = list_first_entry(&mux->psocks_avail,
665 struct kcm_psock,
666 psock_avail_list);
667 list_del(&psock->psock_avail_list);
668 if (kcm->tx_wait) {
669 list_del(&kcm->wait_psock_list);
670 kcm->tx_wait = false;
671 }
672 kcm->tx_psock = psock;
673 psock->tx_kcm = kcm;
674 } else if (!kcm->tx_wait) {
675 list_add_tail(&kcm->wait_psock_list,
676 &mux->kcm_tx_waiters);
677 kcm->tx_wait = true;
678 }
679
680 spin_unlock_bh(&mux->lock);
681
682 return psock;
683}
684
685/* mux lock held */
686static void psock_now_avail(struct kcm_psock *psock)
687{
688 struct kcm_mux *mux = psock->mux;
689 struct kcm_sock *kcm;
690
691 if (list_empty(&mux->kcm_tx_waiters)) {
692 list_add_tail(&psock->psock_avail_list,
693 &mux->psocks_avail);
694 } else {
695 kcm = list_first_entry(&mux->kcm_tx_waiters,
696 struct kcm_sock,
697 wait_psock_list);
698 list_del(&kcm->wait_psock_list);
699 kcm->tx_wait = false;
700 psock->tx_kcm = kcm;
701
702 /* Commit before changing tx_psock since that is read in
703 * reserve_psock before queuing work.
704 */
705 smp_mb();
706
707 kcm->tx_psock = psock;
708 queue_work(kcm_wq, &kcm->tx_work);
709 }
710}
711
712/* kcm sock is locked. */
713static void unreserve_psock(struct kcm_sock *kcm)
714{
715 struct kcm_psock *psock;
716 struct kcm_mux *mux = kcm->mux;
717
718 spin_lock_bh(&mux->lock);
719
720 psock = kcm->tx_psock;
721
722 if (WARN_ON(!psock)) {
723 spin_unlock_bh(&mux->lock);
724 return;
725 }
726
727 smp_rmb(); /* Read tx_psock before tx_wait */
728
729 WARN_ON(kcm->tx_wait);
730
731 kcm->tx_psock = NULL;
732 psock->tx_kcm = NULL;
733
734 if (unlikely(psock->tx_stopped)) {
735 if (psock->done) {
736 /* Deferred free */
737 list_del(&psock->psock_list);
738 mux->psocks_cnt--;
739 sock_put(psock->sk);
740 fput(psock->sk->sk_socket->file);
741 kmem_cache_free(kcm_psockp, psock);
742 }
743
744 /* Don't put back on available list */
745
746 spin_unlock_bh(&mux->lock);
747
748 return;
749 }
750
751 psock_now_avail(psock);
752
753 spin_unlock_bh(&mux->lock);
754}
755
756/* Write any messages ready on the kcm socket. Called with kcm sock lock
757 * held. Return bytes actually sent or error.
758 */
759static int kcm_write_msgs(struct kcm_sock *kcm)
760{
761 struct sock *sk = &kcm->sk;
762 struct kcm_psock *psock;
763 struct sk_buff *skb, *head;
764 struct kcm_tx_msg *txm;
765 unsigned short fragidx, frag_offset;
766 unsigned int sent, total_sent = 0;
767 int ret = 0;
768
769 kcm->tx_wait_more = false;
770 psock = kcm->tx_psock;
771 if (unlikely(psock && psock->tx_stopped)) {
772 /* A reserved psock was aborted asynchronously. Unreserve
773 * it and we'll retry the message.
774 */
775 unreserve_psock(kcm);
776 if (skb_queue_empty(&sk->sk_write_queue))
777 return 0;
778
779 kcm_tx_msg(skb_peek(&sk->sk_write_queue))->sent = 0;
780
781 } else if (skb_queue_empty(&sk->sk_write_queue)) {
782 return 0;
783 }
784
785 head = skb_peek(&sk->sk_write_queue);
786 txm = kcm_tx_msg(head);
787
788 if (txm->sent) {
789 /* Send of first skbuff in queue already in progress */
790 if (WARN_ON(!psock)) {
791 ret = -EINVAL;
792 goto out;
793 }
794 sent = txm->sent;
795 frag_offset = txm->frag_offset;
796 fragidx = txm->fragidx;
797 skb = txm->frag_skb;
798
799 goto do_frag;
800 }
801
802try_again:
803 psock = reserve_psock(kcm);
804 if (!psock)
805 goto out;
806
807 do {
808 skb = head;
809 txm = kcm_tx_msg(head);
810 sent = 0;
811
812do_frag_list:
813 if (WARN_ON(!skb_shinfo(skb)->nr_frags)) {
814 ret = -EINVAL;
815 goto out;
816 }
817
818 for (fragidx = 0; fragidx < skb_shinfo(skb)->nr_frags;
819 fragidx++) {
820 skb_frag_t *frag;
821
822 frag_offset = 0;
823do_frag:
824 frag = &skb_shinfo(skb)->frags[fragidx];
825 if (WARN_ON(!frag->size)) {
826 ret = -EINVAL;
827 goto out;
828 }
829
830 ret = kernel_sendpage(psock->sk->sk_socket,
831 frag->page.p,
832 frag->page_offset + frag_offset,
833 frag->size - frag_offset,
834 MSG_DONTWAIT);
835 if (ret <= 0) {
836 if (ret == -EAGAIN) {
837 /* Save state to try again when there's
838 * write space on the socket
839 */
840 txm->sent = sent;
841 txm->frag_offset = frag_offset;
842 txm->fragidx = fragidx;
843 txm->frag_skb = skb;
844
845 ret = 0;
846 goto out;
847 }
848
849 /* Hard failure in sending message, abort this
850 * psock since it has lost framing
851 * synchonization and retry sending the
852 * message from the beginning.
853 */
854 kcm_abort_tx_psock(psock, ret ? -ret : EPIPE,
855 true);
856 unreserve_psock(kcm);
857
858 txm->sent = 0;
859 ret = 0;
860
861 goto try_again;
862 }
863
864 sent += ret;
865 frag_offset += ret;
866 if (frag_offset < frag->size) {
867 /* Not finished with this frag */
868 goto do_frag;
869 }
870 }
871
872 if (skb == head) {
873 if (skb_has_frag_list(skb)) {
874 skb = skb_shinfo(skb)->frag_list;
875 goto do_frag_list;
876 }
877 } else if (skb->next) {
878 skb = skb->next;
879 goto do_frag_list;
880 }
881
882 /* Successfully sent the whole packet, account for it. */
883 skb_dequeue(&sk->sk_write_queue);
884 kfree_skb(head);
885 sk->sk_wmem_queued -= sent;
886 total_sent += sent;
887 } while ((head = skb_peek(&sk->sk_write_queue)));
888out:
889 if (!head) {
890 /* Done with all queued messages. */
891 WARN_ON(!skb_queue_empty(&sk->sk_write_queue));
892 unreserve_psock(kcm);
893 }
894
895 /* Check if write space is available */
896 sk->sk_write_space(sk);
897
898 return total_sent ? : ret;
899}
900
901static void kcm_tx_work(struct work_struct *w)
902{
903 struct kcm_sock *kcm = container_of(w, struct kcm_sock, tx_work);
904 struct sock *sk = &kcm->sk;
905 int err;
906
907 lock_sock(sk);
908
909 /* Primarily for SOCK_DGRAM sockets, also handle asynchronous tx
910 * aborts
911 */
912 err = kcm_write_msgs(kcm);
913 if (err < 0) {
914 /* Hard failure in write, report error on KCM socket */
915 pr_warn("KCM: Hard failure on kcm_write_msgs %d\n", err);
916 report_csk_error(&kcm->sk, -err);
917 goto out;
918 }
919
920 /* Primarily for SOCK_SEQPACKET sockets */
921 if (likely(sk->sk_socket) &&
922 test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
923 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
924 sk->sk_write_space(sk);
925 }
926
927out:
928 release_sock(sk);
929}
930
931static void kcm_push(struct kcm_sock *kcm)
932{
933 if (kcm->tx_wait_more)
934 kcm_write_msgs(kcm);
935}
936
937static int kcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
938{
939 struct sock *sk = sock->sk;
940 struct kcm_sock *kcm = kcm_sk(sk);
941 struct sk_buff *skb = NULL, *head = NULL;
942 size_t copy, copied = 0;
943 long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
944 int eor = (sock->type == SOCK_DGRAM) ?
945 !(msg->msg_flags & MSG_MORE) : !!(msg->msg_flags & MSG_EOR);
946 int err = -EPIPE;
947
948 lock_sock(sk);
949
950 /* Per tcp_sendmsg this should be in poll */
951 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
952
953 if (sk->sk_err)
954 goto out_error;
955
956 if (kcm->seq_skb) {
957 /* Previously opened message */
958 head = kcm->seq_skb;
959 skb = kcm_tx_msg(head)->last_skb;
960 goto start;
961 }
962
963 /* Call the sk_stream functions to manage the sndbuf mem. */
964 if (!sk_stream_memory_free(sk)) {
965 kcm_push(kcm);
966 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
967 err = sk_stream_wait_memory(sk, &timeo);
968 if (err)
969 goto out_error;
970 }
971
972 /* New message, alloc head skb */
973 head = alloc_skb(0, sk->sk_allocation);
974 while (!head) {
975 kcm_push(kcm);
976 err = sk_stream_wait_memory(sk, &timeo);
977 if (err)
978 goto out_error;
979
980 head = alloc_skb(0, sk->sk_allocation);
981 }
982
983 skb = head;
984
985 /* Set ip_summed to CHECKSUM_UNNECESSARY to avoid calling
986 * csum_and_copy_from_iter from skb_do_copy_data_nocache.
987 */
988 skb->ip_summed = CHECKSUM_UNNECESSARY;
989
990start:
991 while (msg_data_left(msg)) {
992 bool merge = true;
993 int i = skb_shinfo(skb)->nr_frags;
994 struct page_frag *pfrag = sk_page_frag(sk);
995
996 if (!sk_page_frag_refill(sk, pfrag))
997 goto wait_for_memory;
998
999 if (!skb_can_coalesce(skb, i, pfrag->page,
1000 pfrag->offset)) {
1001 if (i == MAX_SKB_FRAGS) {
1002 struct sk_buff *tskb;
1003
1004 tskb = alloc_skb(0, sk->sk_allocation);
1005 if (!tskb)
1006 goto wait_for_memory;
1007
1008 if (head == skb)
1009 skb_shinfo(head)->frag_list = tskb;
1010 else
1011 skb->next = tskb;
1012
1013 skb = tskb;
1014 skb->ip_summed = CHECKSUM_UNNECESSARY;
1015 continue;
1016 }
1017 merge = false;
1018 }
1019
1020 copy = min_t(int, msg_data_left(msg),
1021 pfrag->size - pfrag->offset);
1022
1023 if (!sk_wmem_schedule(sk, copy))
1024 goto wait_for_memory;
1025
1026 err = skb_copy_to_page_nocache(sk, &msg->msg_iter, skb,
1027 pfrag->page,
1028 pfrag->offset,
1029 copy);
1030 if (err)
1031 goto out_error;
1032
1033 /* Update the skb. */
1034 if (merge) {
1035 skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy);
1036 } else {
1037 skb_fill_page_desc(skb, i, pfrag->page,
1038 pfrag->offset, copy);
1039 get_page(pfrag->page);
1040 }
1041
1042 pfrag->offset += copy;
1043 copied += copy;
1044 if (head != skb) {
1045 head->len += copy;
1046 head->data_len += copy;
1047 }
1048
1049 continue;
1050
1051wait_for_memory:
1052 kcm_push(kcm);
1053 err = sk_stream_wait_memory(sk, &timeo);
1054 if (err)
1055 goto out_error;
1056 }
1057
1058 if (eor) {
1059 bool not_busy = skb_queue_empty(&sk->sk_write_queue);
1060
1061 /* Message complete, queue it on send buffer */
1062 __skb_queue_tail(&sk->sk_write_queue, head);
1063 kcm->seq_skb = NULL;
1064
1065 if (msg->msg_flags & MSG_BATCH) {
1066 kcm->tx_wait_more = true;
1067 } else if (kcm->tx_wait_more || not_busy) {
1068 err = kcm_write_msgs(kcm);
1069 if (err < 0) {
1070 /* We got a hard error in write_msgs but have
1071 * already queued this message. Report an error
1072 * in the socket, but don't affect return value
1073 * from sendmsg
1074 */
1075 pr_warn("KCM: Hard failure on kcm_write_msgs\n");
1076 report_csk_error(&kcm->sk, -err);
1077 }
1078 }
1079 } else {
1080 /* Message not complete, save state */
1081partial_message:
1082 kcm->seq_skb = head;
1083 kcm_tx_msg(head)->last_skb = skb;
1084 }
1085
1086 release_sock(sk);
1087 return copied;
1088
1089out_error:
1090 kcm_push(kcm);
1091
1092 if (copied && sock->type == SOCK_SEQPACKET) {
1093 /* Wrote some bytes before encountering an
1094 * error, return partial success.
1095 */
1096 goto partial_message;
1097 }
1098
1099 if (head != kcm->seq_skb)
1100 kfree_skb(head);
1101
1102 err = sk_stream_error(sk, msg->msg_flags, err);
1103
1104 /* make sure we wake any epoll edge trigger waiter */
1105 if (unlikely(skb_queue_len(&sk->sk_write_queue) == 0 && err == -EAGAIN))
1106 sk->sk_write_space(sk);
1107
1108 release_sock(sk);
1109 return err;
1110}
1111
1112static struct sk_buff *kcm_wait_data(struct sock *sk, int flags,
1113 long timeo, int *err)
1114{
1115 struct sk_buff *skb;
1116
1117 while (!(skb = skb_peek(&sk->sk_receive_queue))) {
1118 if (sk->sk_err) {
1119 *err = sock_error(sk);
1120 return NULL;
1121 }
1122
1123 if (sock_flag(sk, SOCK_DONE))
1124 return NULL;
1125
1126 if ((flags & MSG_DONTWAIT) || !timeo) {
1127 *err = -EAGAIN;
1128 return NULL;
1129 }
1130
1131 sk_wait_data(sk, &timeo, NULL);
1132
1133 /* Handle signals */
1134 if (signal_pending(current)) {
1135 *err = sock_intr_errno(timeo);
1136 return NULL;
1137 }
1138 }
1139
1140 return skb;
1141}
1142
1143static int kcm_recvmsg(struct socket *sock, struct msghdr *msg,
1144 size_t len, int flags)
1145{
1146 struct sock *sk = sock->sk;
1147 int err = 0;
1148 long timeo;
1149 struct kcm_rx_msg *rxm;
1150 int copied = 0;
1151 struct sk_buff *skb;
1152
1153 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1154
1155 lock_sock(sk);
1156
1157 skb = kcm_wait_data(sk, flags, timeo, &err);
1158 if (!skb)
1159 goto out;
1160
1161 /* Okay, have a message on the receive queue */
1162
1163 rxm = kcm_rx_msg(skb);
1164
1165 if (len > rxm->full_len)
1166 len = rxm->full_len;
1167
1168 err = skb_copy_datagram_msg(skb, rxm->offset, msg, len);
1169 if (err < 0)
1170 goto out;
1171
1172 copied = len;
1173 if (likely(!(flags & MSG_PEEK))) {
1174 if (copied < rxm->full_len) {
1175 if (sock->type == SOCK_DGRAM) {
1176 /* Truncated message */
1177 msg->msg_flags |= MSG_TRUNC;
1178 goto msg_finished;
1179 }
1180 rxm->offset += copied;
1181 rxm->full_len -= copied;
1182 } else {
1183msg_finished:
1184 /* Finished with message */
1185 msg->msg_flags |= MSG_EOR;
1186 skb_unlink(skb, &sk->sk_receive_queue);
1187 kfree_skb(skb);
1188 }
1189 }
1190
1191out:
1192 release_sock(sk);
1193
1194 return copied ? : err;
1195}
1196
1197/* kcm sock lock held */
1198static void kcm_recv_disable(struct kcm_sock *kcm)
1199{
1200 struct kcm_mux *mux = kcm->mux;
1201
1202 if (kcm->rx_disabled)
1203 return;
1204
1205 spin_lock_bh(&mux->rx_lock);
1206
1207 kcm->rx_disabled = 1;
1208
1209 /* If a psock is reserved we'll do cleanup in unreserve */
1210 if (!kcm->rx_psock) {
1211 if (kcm->rx_wait) {
1212 list_del(&kcm->wait_rx_list);
1213 kcm->rx_wait = false;
1214 }
1215
1216 requeue_rx_msgs(mux, &kcm->sk.sk_receive_queue);
1217 }
1218
1219 spin_unlock_bh(&mux->rx_lock);
1220}
1221
1222/* kcm sock lock held */
1223static void kcm_recv_enable(struct kcm_sock *kcm)
1224{
1225 struct kcm_mux *mux = kcm->mux;
1226
1227 if (!kcm->rx_disabled)
1228 return;
1229
1230 spin_lock_bh(&mux->rx_lock);
1231
1232 kcm->rx_disabled = 0;
1233 kcm_rcv_ready(kcm);
1234
1235 spin_unlock_bh(&mux->rx_lock);
1236}
1237
1238static int kcm_setsockopt(struct socket *sock, int level, int optname,
1239 char __user *optval, unsigned int optlen)
1240{
1241 struct kcm_sock *kcm = kcm_sk(sock->sk);
1242 int val, valbool;
1243 int err = 0;
1244
1245 if (level != SOL_KCM)
1246 return -ENOPROTOOPT;
1247
1248 if (optlen < sizeof(int))
1249 return -EINVAL;
1250
1251 if (get_user(val, (int __user *)optval))
1252 return -EINVAL;
1253
1254 valbool = val ? 1 : 0;
1255
1256 switch (optname) {
1257 case KCM_RECV_DISABLE:
1258 lock_sock(&kcm->sk);
1259 if (valbool)
1260 kcm_recv_disable(kcm);
1261 else
1262 kcm_recv_enable(kcm);
1263 release_sock(&kcm->sk);
1264 break;
1265 default:
1266 err = -ENOPROTOOPT;
1267 }
1268
1269 return err;
1270}
1271
1272static int kcm_getsockopt(struct socket *sock, int level, int optname,
1273 char __user *optval, int __user *optlen)
1274{
1275 struct kcm_sock *kcm = kcm_sk(sock->sk);
1276 int val, len;
1277
1278 if (level != SOL_KCM)
1279 return -ENOPROTOOPT;
1280
1281 if (get_user(len, optlen))
1282 return -EFAULT;
1283
1284 len = min_t(unsigned int, len, sizeof(int));
1285 if (len < 0)
1286 return -EINVAL;
1287
1288 switch (optname) {
1289 case KCM_RECV_DISABLE:
1290 val = kcm->rx_disabled;
1291 break;
1292 default:
1293 return -ENOPROTOOPT;
1294 }
1295
1296 if (put_user(len, optlen))
1297 return -EFAULT;
1298 if (copy_to_user(optval, &val, len))
1299 return -EFAULT;
1300 return 0;
1301}
1302
1303static void init_kcm_sock(struct kcm_sock *kcm, struct kcm_mux *mux)
1304{
1305 struct kcm_sock *tkcm;
1306 struct list_head *head;
1307 int index = 0;
1308
1309 /* For SOCK_SEQPACKET sock type, datagram_poll checks the sk_state, so
1310 * we set sk_state, otherwise epoll_wait always returns right away with
1311 * POLLHUP
1312 */
1313 kcm->sk.sk_state = TCP_ESTABLISHED;
1314
1315 /* Add to mux's kcm sockets list */
1316 kcm->mux = mux;
1317 spin_lock_bh(&mux->lock);
1318
1319 head = &mux->kcm_socks;
1320 list_for_each_entry(tkcm, &mux->kcm_socks, kcm_sock_list) {
1321 if (tkcm->index != index)
1322 break;
1323 head = &tkcm->kcm_sock_list;
1324 index++;
1325 }
1326
1327 list_add(&kcm->kcm_sock_list, head);
1328 kcm->index = index;
1329
1330 mux->kcm_socks_cnt++;
1331 spin_unlock_bh(&mux->lock);
1332
1333 INIT_WORK(&kcm->tx_work, kcm_tx_work);
1334
1335 spin_lock_bh(&mux->rx_lock);
1336 kcm_rcv_ready(kcm);
1337 spin_unlock_bh(&mux->rx_lock);
1338}
1339
1340static int kcm_attach(struct socket *sock, struct socket *csock,
1341 struct bpf_prog *prog)
1342{
1343 struct kcm_sock *kcm = kcm_sk(sock->sk);
1344 struct kcm_mux *mux = kcm->mux;
1345 struct sock *csk;
1346 struct kcm_psock *psock = NULL, *tpsock;
1347 struct list_head *head;
1348 int index = 0;
1349
1350 if (csock->ops->family != PF_INET &&
1351 csock->ops->family != PF_INET6)
1352 return -EINVAL;
1353
1354 csk = csock->sk;
1355 if (!csk)
1356 return -EINVAL;
1357
1358 /* Only support TCP for now */
1359 if (csk->sk_protocol != IPPROTO_TCP)
1360 return -EINVAL;
1361
1362 psock = kmem_cache_zalloc(kcm_psockp, GFP_KERNEL);
1363 if (!psock)
1364 return -ENOMEM;
1365
1366 psock->mux = mux;
1367 psock->sk = csk;
1368 psock->bpf_prog = prog;
1369 INIT_WORK(&psock->rx_work, psock_rx_work);
1370 INIT_DELAYED_WORK(&psock->rx_delayed_work, psock_rx_delayed_work);
1371
1372 sock_hold(csk);
1373
1374 write_lock_bh(&csk->sk_callback_lock);
1375 psock->save_data_ready = csk->sk_data_ready;
1376 psock->save_write_space = csk->sk_write_space;
1377 psock->save_state_change = csk->sk_state_change;
1378 csk->sk_user_data = psock;
1379 csk->sk_data_ready = psock_tcp_data_ready;
1380 csk->sk_write_space = psock_tcp_write_space;
1381 csk->sk_state_change = psock_tcp_state_change;
1382 write_unlock_bh(&csk->sk_callback_lock);
1383
1384 /* Finished initialization, now add the psock to the MUX. */
1385 spin_lock_bh(&mux->lock);
1386 head = &mux->psocks;
1387 list_for_each_entry(tpsock, &mux->psocks, psock_list) {
1388 if (tpsock->index != index)
1389 break;
1390 head = &tpsock->psock_list;
1391 index++;
1392 }
1393
1394 list_add(&psock->psock_list, head);
1395 psock->index = index;
1396
1397 mux->psocks_cnt++;
1398 psock_now_avail(psock);
1399 spin_unlock_bh(&mux->lock);
1400
1401 /* Schedule RX work in case there are already bytes queued */
1402 queue_work(kcm_wq, &psock->rx_work);
1403
1404 return 0;
1405}
1406
1407static int kcm_attach_ioctl(struct socket *sock, struct kcm_attach *info)
1408{
1409 struct socket *csock;
1410 struct bpf_prog *prog;
1411 int err;
1412
1413 csock = sockfd_lookup(info->fd, &err);
1414 if (!csock)
1415 return -ENOENT;
1416
1417 prog = bpf_prog_get(info->bpf_fd);
1418 if (IS_ERR(prog)) {
1419 err = PTR_ERR(prog);
1420 goto out;
1421 }
1422
1423 if (prog->type != BPF_PROG_TYPE_SOCKET_FILTER) {
1424 bpf_prog_put(prog);
1425 err = -EINVAL;
1426 goto out;
1427 }
1428
1429 err = kcm_attach(sock, csock, prog);
1430 if (err) {
1431 bpf_prog_put(prog);
1432 goto out;
1433 }
1434
1435 /* Keep reference on file also */
1436
1437 return 0;
1438out:
1439 fput(csock->file);
1440 return err;
1441}
1442
1443static void kcm_unattach(struct kcm_psock *psock)
1444{
1445 struct sock *csk = psock->sk;
1446 struct kcm_mux *mux = psock->mux;
1447
1448 /* Stop getting callbacks from TCP socket. After this there should
1449 * be no way to reserve a kcm for this psock.
1450 */
1451 write_lock_bh(&csk->sk_callback_lock);
1452 csk->sk_user_data = NULL;
1453 csk->sk_data_ready = psock->save_data_ready;
1454 csk->sk_write_space = psock->save_write_space;
1455 csk->sk_state_change = psock->save_state_change;
1456 psock->rx_stopped = 1;
1457
1458 if (WARN_ON(psock->rx_kcm)) {
1459 write_unlock_bh(&csk->sk_callback_lock);
1460 return;
1461 }
1462
1463 spin_lock_bh(&mux->rx_lock);
1464
1465 /* Stop receiver activities. After this point psock should not be
1466 * able to get onto ready list either through callbacks or work.
1467 */
1468 if (psock->ready_rx_msg) {
1469 list_del(&psock->psock_ready_list);
1470 kfree_skb(psock->ready_rx_msg);
1471 psock->ready_rx_msg = NULL;
1472 }
1473
1474 spin_unlock_bh(&mux->rx_lock);
1475
1476 write_unlock_bh(&csk->sk_callback_lock);
1477
1478 cancel_work_sync(&psock->rx_work);
1479 cancel_delayed_work_sync(&psock->rx_delayed_work);
1480
1481 bpf_prog_put(psock->bpf_prog);
1482
1483 kfree_skb(psock->rx_skb_head);
1484 psock->rx_skb_head = NULL;
1485
1486 spin_lock_bh(&mux->lock);
1487
1488 if (psock->tx_kcm) {
1489 /* psock was reserved. Just mark it finished and we will clean
1490 * up in the kcm paths, we need kcm lock which can not be
1491 * acquired here.
1492 */
1493 spin_unlock_bh(&mux->lock);
1494
1495 /* We are unattaching a socket that is reserved. Abort the
1496 * socket since we may be out of sync in sending on it. We need
1497 * to do this without the mux lock.
1498 */
1499 kcm_abort_tx_psock(psock, EPIPE, false);
1500
1501 spin_lock_bh(&mux->lock);
1502 if (!psock->tx_kcm) {
1503 /* psock now unreserved in window mux was unlocked */
1504 goto no_reserved;
1505 }
1506 psock->done = 1;
1507
1508 /* Commit done before queuing work to process it */
1509 smp_mb();
1510
1511 /* Queue tx work to make sure psock->done is handled */
1512 queue_work(kcm_wq, &psock->tx_kcm->tx_work);
1513 spin_unlock_bh(&mux->lock);
1514 } else {
1515no_reserved:
1516 if (!psock->tx_stopped)
1517 list_del(&psock->psock_avail_list);
1518 list_del(&psock->psock_list);
1519 mux->psocks_cnt--;
1520 spin_unlock_bh(&mux->lock);
1521
1522 sock_put(csk);
1523 fput(csk->sk_socket->file);
1524 kmem_cache_free(kcm_psockp, psock);
1525 }
1526}
1527
1528static int kcm_unattach_ioctl(struct socket *sock, struct kcm_unattach *info)
1529{
1530 struct kcm_sock *kcm = kcm_sk(sock->sk);
1531 struct kcm_mux *mux = kcm->mux;
1532 struct kcm_psock *psock;
1533 struct socket *csock;
1534 struct sock *csk;
1535 int err;
1536
1537 csock = sockfd_lookup(info->fd, &err);
1538 if (!csock)
1539 return -ENOENT;
1540
1541 csk = csock->sk;
1542 if (!csk) {
1543 err = -EINVAL;
1544 goto out;
1545 }
1546
1547 err = -ENOENT;
1548
1549 spin_lock_bh(&mux->lock);
1550
1551 list_for_each_entry(psock, &mux->psocks, psock_list) {
1552 if (psock->sk != csk)
1553 continue;
1554
1555 /* Found the matching psock */
1556
1557 if (psock->unattaching || WARN_ON(psock->done)) {
1558 err = -EALREADY;
1559 break;
1560 }
1561
1562 psock->unattaching = 1;
1563
1564 spin_unlock_bh(&mux->lock);
1565
1566 kcm_unattach(psock);
1567
1568 err = 0;
1569 goto out;
1570 }
1571
1572 spin_unlock_bh(&mux->lock);
1573
1574out:
1575 fput(csock->file);
1576 return err;
1577}
1578
1579static struct proto kcm_proto = {
1580 .name = "KCM",
1581 .owner = THIS_MODULE,
1582 .obj_size = sizeof(struct kcm_sock),
1583};
1584
1585/* Clone a kcm socket. */
1586static int kcm_clone(struct socket *osock, struct kcm_clone *info,
1587 struct socket **newsockp)
1588{
1589 struct socket *newsock;
1590 struct sock *newsk;
1591 struct file *newfile;
1592 int err, newfd;
1593
1594 err = -ENFILE;
1595 newsock = sock_alloc();
1596 if (!newsock)
1597 goto out;
1598
1599 newsock->type = osock->type;
1600 newsock->ops = osock->ops;
1601
1602 __module_get(newsock->ops->owner);
1603
1604 newfd = get_unused_fd_flags(0);
1605 if (unlikely(newfd < 0)) {
1606 err = newfd;
1607 goto out_fd_fail;
1608 }
1609
1610 newfile = sock_alloc_file(newsock, 0, osock->sk->sk_prot_creator->name);
1611 if (unlikely(IS_ERR(newfile))) {
1612 err = PTR_ERR(newfile);
1613 goto out_sock_alloc_fail;
1614 }
1615
1616 newsk = sk_alloc(sock_net(osock->sk), PF_KCM, GFP_KERNEL,
1617 &kcm_proto, true);
1618 if (!newsk) {
1619 err = -ENOMEM;
1620 goto out_sk_alloc_fail;
1621 }
1622
1623 sock_init_data(newsock, newsk);
1624 init_kcm_sock(kcm_sk(newsk), kcm_sk(osock->sk)->mux);
1625
1626 fd_install(newfd, newfile);
1627 *newsockp = newsock;
1628 info->fd = newfd;
1629
1630 return 0;
1631
1632out_sk_alloc_fail:
1633 fput(newfile);
1634out_sock_alloc_fail:
1635 put_unused_fd(newfd);
1636out_fd_fail:
1637 sock_release(newsock);
1638out:
1639 return err;
1640}
1641
1642static int kcm_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1643{
1644 int err;
1645
1646 switch (cmd) {
1647 case SIOCKCMATTACH: {
1648 struct kcm_attach info;
1649
1650 if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
1651 err = -EFAULT;
1652
1653 err = kcm_attach_ioctl(sock, &info);
1654
1655 break;
1656 }
1657 case SIOCKCMUNATTACH: {
1658 struct kcm_unattach info;
1659
1660 if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
1661 err = -EFAULT;
1662
1663 err = kcm_unattach_ioctl(sock, &info);
1664
1665 break;
1666 }
1667 case SIOCKCMCLONE: {
1668 struct kcm_clone info;
1669 struct socket *newsock = NULL;
1670
1671 if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
1672 err = -EFAULT;
1673
1674 err = kcm_clone(sock, &info, &newsock);
1675
1676 if (!err) {
1677 if (copy_to_user((void __user *)arg, &info,
1678 sizeof(info))) {
1679 err = -EFAULT;
1680 sock_release(newsock);
1681 }
1682 }
1683
1684 break;
1685 }
1686 default:
1687 err = -ENOIOCTLCMD;
1688 break;
1689 }
1690
1691 return err;
1692}
1693
1694static void free_mux(struct rcu_head *rcu)
1695{
1696 struct kcm_mux *mux = container_of(rcu,
1697 struct kcm_mux, rcu);
1698
1699 kmem_cache_free(kcm_muxp, mux);
1700}
1701
1702static void release_mux(struct kcm_mux *mux)
1703{
1704 struct kcm_net *knet = mux->knet;
1705 struct kcm_psock *psock, *tmp_psock;
1706
1707 /* Release psocks */
1708 list_for_each_entry_safe(psock, tmp_psock,
1709 &mux->psocks, psock_list) {
1710 if (!WARN_ON(psock->unattaching))
1711 kcm_unattach(psock);
1712 }
1713
1714 if (WARN_ON(mux->psocks_cnt))
1715 return;
1716
1717 __skb_queue_purge(&mux->rx_hold_queue);
1718
1719 mutex_lock(&knet->mutex);
1720 list_del_rcu(&mux->kcm_mux_list);
1721 knet->count--;
1722 mutex_unlock(&knet->mutex);
1723
1724 call_rcu(&mux->rcu, free_mux);
1725}
1726
1727static void kcm_done(struct kcm_sock *kcm)
1728{
1729 struct kcm_mux *mux = kcm->mux;
1730 struct sock *sk = &kcm->sk;
1731 int socks_cnt;
1732
1733 spin_lock_bh(&mux->rx_lock);
1734 if (kcm->rx_psock) {
1735 /* Cleanup in unreserve_rx_kcm */
1736 WARN_ON(kcm->done);
1737 kcm->rx_disabled = 1;
1738 kcm->done = 1;
1739 spin_unlock_bh(&mux->rx_lock);
1740 return;
1741 }
1742
1743 if (kcm->rx_wait) {
1744 list_del(&kcm->wait_rx_list);
1745 kcm->rx_wait = false;
1746 }
1747 /* Move any pending receive messages to other kcm sockets */
1748 requeue_rx_msgs(mux, &sk->sk_receive_queue);
1749
1750 spin_unlock_bh(&mux->rx_lock);
1751
1752 if (WARN_ON(sk_rmem_alloc_get(sk)))
1753 return;
1754
1755 /* Detach from MUX */
1756 spin_lock_bh(&mux->lock);
1757
1758 list_del(&kcm->kcm_sock_list);
1759 mux->kcm_socks_cnt--;
1760 socks_cnt = mux->kcm_socks_cnt;
1761
1762 spin_unlock_bh(&mux->lock);
1763
1764 if (!socks_cnt) {
1765 /* We are done with the mux now. */
1766 release_mux(mux);
1767 }
1768
1769 WARN_ON(kcm->rx_wait);
1770
1771 sock_put(&kcm->sk);
1772}
1773
1774/* Called by kcm_release to close a KCM socket.
1775 * If this is the last KCM socket on the MUX, destroy the MUX.
1776 */
1777static int kcm_release(struct socket *sock)
1778{
1779 struct sock *sk = sock->sk;
1780 struct kcm_sock *kcm;
1781 struct kcm_mux *mux;
1782 struct kcm_psock *psock;
1783
1784 if (!sk)
1785 return 0;
1786
1787 kcm = kcm_sk(sk);
1788 mux = kcm->mux;
1789
1790 sock_orphan(sk);
1791 kfree_skb(kcm->seq_skb);
1792
1793 lock_sock(sk);
1794 /* Purge queue under lock to avoid race condition with tx_work trying
1795 * to act when queue is nonempty. If tx_work runs after this point
1796 * it will just return.
1797 */
1798 __skb_queue_purge(&sk->sk_write_queue);
1799 release_sock(sk);
1800
1801 spin_lock_bh(&mux->lock);
1802 if (kcm->tx_wait) {
1803 /* Take of tx_wait list, after this point there should be no way
1804 * that a psock will be assigned to this kcm.
1805 */
1806 list_del(&kcm->wait_psock_list);
1807 kcm->tx_wait = false;
1808 }
1809 spin_unlock_bh(&mux->lock);
1810
1811 /* Cancel work. After this point there should be no outside references
1812 * to the kcm socket.
1813 */
1814 cancel_work_sync(&kcm->tx_work);
1815
1816 lock_sock(sk);
1817 psock = kcm->tx_psock;
1818 if (psock) {
1819 /* A psock was reserved, so we need to kill it since it
1820 * may already have some bytes queued from a message. We
1821 * need to do this after removing kcm from tx_wait list.
1822 */
1823 kcm_abort_tx_psock(psock, EPIPE, false);
1824 unreserve_psock(kcm);
1825 }
1826 release_sock(sk);
1827
1828 WARN_ON(kcm->tx_wait);
1829 WARN_ON(kcm->tx_psock);
1830
1831 sock->sk = NULL;
1832
1833 kcm_done(kcm);
1834
1835 return 0;
1836}
1837
1838static const struct proto_ops kcm_ops = {
1839 .family = PF_KCM,
1840 .owner = THIS_MODULE,
1841 .release = kcm_release,
1842 .bind = sock_no_bind,
1843 .connect = sock_no_connect,
1844 .socketpair = sock_no_socketpair,
1845 .accept = sock_no_accept,
1846 .getname = sock_no_getname,
1847 .poll = datagram_poll,
1848 .ioctl = kcm_ioctl,
1849 .listen = sock_no_listen,
1850 .shutdown = sock_no_shutdown,
1851 .setsockopt = kcm_setsockopt,
1852 .getsockopt = kcm_getsockopt,
1853 .sendmsg = kcm_sendmsg,
1854 .recvmsg = kcm_recvmsg,
1855 .mmap = sock_no_mmap,
1856 .sendpage = sock_no_sendpage,
1857};
1858
1859/* Create proto operation for kcm sockets */
1860static int kcm_create(struct net *net, struct socket *sock,
1861 int protocol, int kern)
1862{
1863 struct kcm_net *knet = net_generic(net, kcm_net_id);
1864 struct sock *sk;
1865 struct kcm_mux *mux;
1866
1867 switch (sock->type) {
1868 case SOCK_DGRAM:
1869 case SOCK_SEQPACKET:
1870 sock->ops = &kcm_ops;
1871 break;
1872 default:
1873 return -ESOCKTNOSUPPORT;
1874 }
1875
1876 if (protocol != KCMPROTO_CONNECTED)
1877 return -EPROTONOSUPPORT;
1878
1879 sk = sk_alloc(net, PF_KCM, GFP_KERNEL, &kcm_proto, kern);
1880 if (!sk)
1881 return -ENOMEM;
1882
1883 /* Allocate a kcm mux, shared between KCM sockets */
1884 mux = kmem_cache_zalloc(kcm_muxp, GFP_KERNEL);
1885 if (!mux) {
1886 sk_free(sk);
1887 return -ENOMEM;
1888 }
1889
1890 spin_lock_init(&mux->lock);
1891 spin_lock_init(&mux->rx_lock);
1892 INIT_LIST_HEAD(&mux->kcm_socks);
1893 INIT_LIST_HEAD(&mux->kcm_rx_waiters);
1894 INIT_LIST_HEAD(&mux->kcm_tx_waiters);
1895
1896 INIT_LIST_HEAD(&mux->psocks);
1897 INIT_LIST_HEAD(&mux->psocks_ready);
1898 INIT_LIST_HEAD(&mux->psocks_avail);
1899
1900 mux->knet = knet;
1901
1902 /* Add new MUX to list */
1903 mutex_lock(&knet->mutex);
1904 list_add_rcu(&mux->kcm_mux_list, &knet->mux_list);
1905 knet->count++;
1906 mutex_unlock(&knet->mutex);
1907
1908 skb_queue_head_init(&mux->rx_hold_queue);
1909
1910 /* Init KCM socket */
1911 sock_init_data(sock, sk);
1912 init_kcm_sock(kcm_sk(sk), mux);
1913
1914 return 0;
1915}
1916
1917static struct net_proto_family kcm_family_ops = {
1918 .family = PF_KCM,
1919 .create = kcm_create,
1920 .owner = THIS_MODULE,
1921};
1922
1923static __net_init int kcm_init_net(struct net *net)
1924{
1925 struct kcm_net *knet = net_generic(net, kcm_net_id);
1926
1927 INIT_LIST_HEAD_RCU(&knet->mux_list);
1928 mutex_init(&knet->mutex);
1929
1930 return 0;
1931}
1932
1933static __net_exit void kcm_exit_net(struct net *net)
1934{
1935 struct kcm_net *knet = net_generic(net, kcm_net_id);
1936
1937 /* All KCM sockets should be closed at this point, which should mean
1938 * that all multiplexors and psocks have been destroyed.
1939 */
1940 WARN_ON(!list_empty(&knet->mux_list));
1941}
1942
1943static struct pernet_operations kcm_net_ops = {
1944 .init = kcm_init_net,
1945 .exit = kcm_exit_net,
1946 .id = &kcm_net_id,
1947 .size = sizeof(struct kcm_net),
1948};
1949
1950static int __init kcm_init(void)
1951{
1952 int err = -ENOMEM;
1953
1954 kcm_muxp = kmem_cache_create("kcm_mux_cache",
1955 sizeof(struct kcm_mux), 0,
1956 SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
1957 if (!kcm_muxp)
1958 goto fail;
1959
1960 kcm_psockp = kmem_cache_create("kcm_psock_cache",
1961 sizeof(struct kcm_psock), 0,
1962 SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
1963 if (!kcm_psockp)
1964 goto fail;
1965
1966 kcm_wq = create_singlethread_workqueue("kkcmd");
1967 if (!kcm_wq)
1968 goto fail;
1969
1970 err = proto_register(&kcm_proto, 1);
1971 if (err)
1972 goto fail;
1973
1974 err = sock_register(&kcm_family_ops);
1975 if (err)
1976 goto sock_register_fail;
1977
1978 err = register_pernet_device(&kcm_net_ops);
1979 if (err)
1980 goto net_ops_fail;
1981
1982 return 0;
1983
1984net_ops_fail:
1985 sock_unregister(PF_KCM);
1986
1987sock_register_fail:
1988 proto_unregister(&kcm_proto);
1989
1990fail:
1991 kmem_cache_destroy(kcm_muxp);
1992 kmem_cache_destroy(kcm_psockp);
1993
1994 if (kcm_wq)
1995 destroy_workqueue(kcm_wq);
1996
1997 return err;
1998}
1999
2000static void __exit kcm_exit(void)
2001{
2002 unregister_pernet_device(&kcm_net_ops);
2003 sock_unregister(PF_KCM);
2004 proto_unregister(&kcm_proto);
2005 destroy_workqueue(kcm_wq);
2006
2007 kmem_cache_destroy(kcm_muxp);
2008 kmem_cache_destroy(kcm_psockp);
2009}
2010
2011module_init(kcm_init);
2012module_exit(kcm_exit);
2013
2014MODULE_LICENSE("GPL");
2015MODULE_ALIAS_NETPROTO(PF_KCM);
2016
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-14 15:33:30 -0500