2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2014-2019 Netflix Inc.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
32 #include "opt_inet6.h"
35 #include <sys/param.h>
36 #include <sys/kernel.h>
40 #include <sys/mutex.h>
41 #include <sys/rmlock.h>
43 #include <sys/protosw.h>
44 #include <sys/refcount.h>
46 #include <sys/socket.h>
47 #include <sys/socketvar.h>
48 #include <sys/sysctl.h>
49 #include <sys/taskqueue.h>
50 #include <sys/kthread.h>
52 #include <sys/vmmeter.h>
53 #if defined(__aarch64__) || defined(__amd64__) || defined(__i386__)
54 #include <machine/pcb.h>
56 #include <machine/vmparam.h>
58 #include <net/netisr.h>
59 #include <net/rss_config.h>
61 #if defined(INET) || defined(INET6)
62 #include <netinet/in.h>
63 #include <netinet/in_pcb.h>
65 #include <netinet/tcp_var.h>
67 #include <netinet/tcp_offload.h>
69 #include <opencrypto/xform.h>
70 #include <vm/uma_dbg.h>
72 #include <vm/vm_pageout.h>
73 #include <vm/vm_page.h>
77 STAILQ_HEAD(, mbuf_ext_pgs) head;
79 } __aligned(CACHE_LINE_SIZE);
81 static struct ktls_wq *ktls_wq;
82 static struct proc *ktls_proc;
83 LIST_HEAD(, ktls_crypto_backend) ktls_backends;
84 static struct rmlock ktls_backends_lock;
85 static uma_zone_t ktls_session_zone;
86 static uint16_t ktls_cpuid_lookup[MAXCPU];
88 SYSCTL_NODE(_kern_ipc, OID_AUTO, tls, CTLFLAG_RW, 0,
89 "Kernel TLS offload");
90 SYSCTL_NODE(_kern_ipc_tls, OID_AUTO, stats, CTLFLAG_RW, 0,
91 "Kernel TLS offload stats");
93 static int ktls_allow_unload;
94 SYSCTL_INT(_kern_ipc_tls, OID_AUTO, allow_unload, CTLFLAG_RDTUN,
95 &ktls_allow_unload, 0, "Allow software crypto modules to unload");
98 static int ktls_bind_threads = 1;
100 static int ktls_bind_threads;
102 SYSCTL_INT(_kern_ipc_tls, OID_AUTO, bind_threads, CTLFLAG_RDTUN,
103 &ktls_bind_threads, 0,
104 "Bind crypto threads to cores or domains at boot");
106 static u_int ktls_maxlen = 16384;
107 SYSCTL_UINT(_kern_ipc_tls, OID_AUTO, maxlen, CTLFLAG_RWTUN,
108 &ktls_maxlen, 0, "Maximum TLS record size");
110 static int ktls_number_threads;
111 SYSCTL_INT(_kern_ipc_tls_stats, OID_AUTO, threads, CTLFLAG_RD,
112 &ktls_number_threads, 0,
113 "Number of TLS threads in thread-pool");
115 static bool ktls_offload_enable;
116 SYSCTL_BOOL(_kern_ipc_tls, OID_AUTO, enable, CTLFLAG_RW,
117 &ktls_offload_enable, 0,
118 "Enable support for kernel TLS offload");
120 static bool ktls_cbc_enable = true;
121 SYSCTL_BOOL(_kern_ipc_tls, OID_AUTO, cbc_enable, CTLFLAG_RW,
123 "Enable Support of AES-CBC crypto for kernel TLS");
125 static counter_u64_t ktls_tasks_active;
126 SYSCTL_COUNTER_U64(_kern_ipc_tls, OID_AUTO, tasks_active, CTLFLAG_RD,
127 &ktls_tasks_active, "Number of active tasks");
129 static counter_u64_t ktls_cnt_on;
130 SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, so_inqueue, CTLFLAG_RD,
131 &ktls_cnt_on, "Number of TLS records in queue to tasks for SW crypto");
133 static counter_u64_t ktls_offload_total;
134 SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, offload_total,
135 CTLFLAG_RD, &ktls_offload_total,
136 "Total successful TLS setups (parameters set)");
138 static counter_u64_t ktls_offload_enable_calls;
139 SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, enable_calls,
140 CTLFLAG_RD, &ktls_offload_enable_calls,
141 "Total number of TLS enable calls made");
143 static counter_u64_t ktls_offload_active;
144 SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, active, CTLFLAG_RD,
145 &ktls_offload_active, "Total Active TLS sessions");
147 static counter_u64_t ktls_offload_failed_crypto;
148 SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, failed_crypto, CTLFLAG_RD,
149 &ktls_offload_failed_crypto, "Total TLS crypto failures");
151 static counter_u64_t ktls_switch_to_ifnet;
152 SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, switch_to_ifnet, CTLFLAG_RD,
153 &ktls_switch_to_ifnet, "TLS sessions switched from SW to ifnet");
155 static counter_u64_t ktls_switch_to_sw;
156 SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, switch_to_sw, CTLFLAG_RD,
157 &ktls_switch_to_sw, "TLS sessions switched from ifnet to SW");
159 static counter_u64_t ktls_switch_failed;
160 SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, switch_failed, CTLFLAG_RD,
161 &ktls_switch_failed, "TLS sessions unable to switch between SW and ifnet");
163 SYSCTL_NODE(_kern_ipc_tls, OID_AUTO, sw, CTLFLAG_RD, 0,
164 "Software TLS session stats");
165 SYSCTL_NODE(_kern_ipc_tls, OID_AUTO, ifnet, CTLFLAG_RD, 0,
166 "Hardware (ifnet) TLS session stats");
168 SYSCTL_NODE(_kern_ipc_tls, OID_AUTO, toe, CTLFLAG_RD, 0,
169 "TOE TLS session stats");
172 static counter_u64_t ktls_sw_cbc;
173 SYSCTL_COUNTER_U64(_kern_ipc_tls_sw, OID_AUTO, cbc, CTLFLAG_RD, &ktls_sw_cbc,
174 "Active number of software TLS sessions using AES-CBC");
176 static counter_u64_t ktls_sw_gcm;
177 SYSCTL_COUNTER_U64(_kern_ipc_tls_sw, OID_AUTO, gcm, CTLFLAG_RD, &ktls_sw_gcm,
178 "Active number of software TLS sessions using AES-GCM");
180 static counter_u64_t ktls_ifnet_cbc;
181 SYSCTL_COUNTER_U64(_kern_ipc_tls_ifnet, OID_AUTO, cbc, CTLFLAG_RD,
183 "Active number of ifnet TLS sessions using AES-CBC");
185 static counter_u64_t ktls_ifnet_gcm;
186 SYSCTL_COUNTER_U64(_kern_ipc_tls_ifnet, OID_AUTO, gcm, CTLFLAG_RD,
188 "Active number of ifnet TLS sessions using AES-GCM");
190 static counter_u64_t ktls_ifnet_reset;
191 SYSCTL_COUNTER_U64(_kern_ipc_tls_ifnet, OID_AUTO, reset, CTLFLAG_RD,
192 &ktls_ifnet_reset, "TLS sessions updated to a new ifnet send tag");
194 static counter_u64_t ktls_ifnet_reset_dropped;
195 SYSCTL_COUNTER_U64(_kern_ipc_tls_ifnet, OID_AUTO, reset_dropped, CTLFLAG_RD,
196 &ktls_ifnet_reset_dropped,
197 "TLS sessions dropped after failing to update ifnet send tag");
199 static counter_u64_t ktls_ifnet_reset_failed;
200 SYSCTL_COUNTER_U64(_kern_ipc_tls_ifnet, OID_AUTO, reset_failed, CTLFLAG_RD,
201 &ktls_ifnet_reset_failed,
202 "TLS sessions that failed to allocate a new ifnet send tag");
204 static int ktls_ifnet_permitted;
205 SYSCTL_UINT(_kern_ipc_tls_ifnet, OID_AUTO, permitted, CTLFLAG_RWTUN,
206 &ktls_ifnet_permitted, 1,
207 "Whether to permit hardware (ifnet) TLS sessions");
210 static counter_u64_t ktls_toe_cbc;
211 SYSCTL_COUNTER_U64(_kern_ipc_tls_toe, OID_AUTO, cbc, CTLFLAG_RD,
213 "Active number of TOE TLS sessions using AES-CBC");
215 static counter_u64_t ktls_toe_gcm;
216 SYSCTL_COUNTER_U64(_kern_ipc_tls_toe, OID_AUTO, gcm, CTLFLAG_RD,
218 "Active number of TOE TLS sessions using AES-GCM");
221 static MALLOC_DEFINE(M_KTLS, "ktls", "Kernel TLS");
223 static void ktls_cleanup(struct ktls_session *tls);
224 #if defined(INET) || defined(INET6)
225 static void ktls_reset_send_tag(void *context, int pending);
227 static void ktls_work_thread(void *ctx);
230 ktls_crypto_backend_register(struct ktls_crypto_backend *be)
232 struct ktls_crypto_backend *curr_be, *tmp;
234 if (be->api_version != KTLS_API_VERSION) {
235 printf("KTLS: API version mismatch (%d vs %d) for %s\n",
236 be->api_version, KTLS_API_VERSION,
241 rm_wlock(&ktls_backends_lock);
242 printf("KTLS: Registering crypto method %s with prio %d\n",
244 if (LIST_EMPTY(&ktls_backends)) {
245 LIST_INSERT_HEAD(&ktls_backends, be, next);
247 LIST_FOREACH_SAFE(curr_be, &ktls_backends, next, tmp) {
248 if (curr_be->prio < be->prio) {
249 LIST_INSERT_BEFORE(curr_be, be, next);
252 if (LIST_NEXT(curr_be, next) == NULL) {
253 LIST_INSERT_AFTER(curr_be, be, next);
258 rm_wunlock(&ktls_backends_lock);
263 ktls_crypto_backend_deregister(struct ktls_crypto_backend *be)
265 struct ktls_crypto_backend *tmp;
268 * Don't error if the backend isn't registered. This permits
269 * MOD_UNLOAD handlers to use this function unconditionally.
271 rm_wlock(&ktls_backends_lock);
272 LIST_FOREACH(tmp, &ktls_backends, next) {
277 rm_wunlock(&ktls_backends_lock);
281 if (!ktls_allow_unload) {
282 rm_wunlock(&ktls_backends_lock);
284 "KTLS: Deregistering crypto method %s is not supported\n",
290 rm_wunlock(&ktls_backends_lock);
294 LIST_REMOVE(be, next);
295 rm_wunlock(&ktls_backends_lock);
299 #if defined(INET) || defined(INET6)
301 ktls_get_cpu(struct socket *so)
308 cpuid = rss_hash2cpuid(inp->inp_flowid, inp->inp_flowtype);
309 if (cpuid != NETISR_CPUID_NONE)
313 * Just use the flowid to shard connections in a repeatable
314 * fashion. Note that some crypto backends rely on the
315 * serialization provided by having the same connection use
318 cpuid = ktls_cpuid_lookup[inp->inp_flowid % ktls_number_threads];
324 ktls_init(void *dummy __unused)
331 ktls_tasks_active = counter_u64_alloc(M_WAITOK);
332 ktls_cnt_on = counter_u64_alloc(M_WAITOK);
333 ktls_offload_total = counter_u64_alloc(M_WAITOK);
334 ktls_offload_enable_calls = counter_u64_alloc(M_WAITOK);
335 ktls_offload_active = counter_u64_alloc(M_WAITOK);
336 ktls_offload_failed_crypto = counter_u64_alloc(M_WAITOK);
337 ktls_switch_to_ifnet = counter_u64_alloc(M_WAITOK);
338 ktls_switch_to_sw = counter_u64_alloc(M_WAITOK);
339 ktls_switch_failed = counter_u64_alloc(M_WAITOK);
340 ktls_sw_cbc = counter_u64_alloc(M_WAITOK);
341 ktls_sw_gcm = counter_u64_alloc(M_WAITOK);
342 ktls_ifnet_cbc = counter_u64_alloc(M_WAITOK);
343 ktls_ifnet_gcm = counter_u64_alloc(M_WAITOK);
344 ktls_ifnet_reset = counter_u64_alloc(M_WAITOK);
345 ktls_ifnet_reset_dropped = counter_u64_alloc(M_WAITOK);
346 ktls_ifnet_reset_failed = counter_u64_alloc(M_WAITOK);
348 ktls_toe_cbc = counter_u64_alloc(M_WAITOK);
349 ktls_toe_gcm = counter_u64_alloc(M_WAITOK);
352 rm_init(&ktls_backends_lock, "ktls backends");
353 LIST_INIT(&ktls_backends);
355 ktls_wq = malloc(sizeof(*ktls_wq) * (mp_maxid + 1), M_KTLS,
358 ktls_session_zone = uma_zcreate("ktls_session",
359 sizeof(struct ktls_session),
360 NULL, NULL, NULL, NULL,
364 * Initialize the workqueues to run the TLS work. We create a
365 * work queue for each CPU.
368 STAILQ_INIT(&ktls_wq[i].head);
369 mtx_init(&ktls_wq[i].mtx, "ktls work queue", NULL, MTX_DEF);
370 error = kproc_kthread_add(ktls_work_thread, &ktls_wq[i],
371 &ktls_proc, &td, 0, 0, "KTLS", "thr_%d", i);
373 panic("Can't add KTLS thread %d error %d", i, error);
376 * Bind threads to cores. If ktls_bind_threads is >
377 * 1, then we bind to the NUMA domain.
379 if (ktls_bind_threads) {
380 if (ktls_bind_threads > 1) {
382 CPU_COPY(&cpuset_domain[pc->pc_domain], &mask);
386 error = cpuset_setthread(td->td_tid, &mask);
389 "Unable to bind KTLS thread for CPU %d error %d",
392 ktls_cpuid_lookup[ktls_number_threads] = i;
393 ktls_number_threads++;
395 printf("KTLS: Initialized %d threads\n", ktls_number_threads);
397 SYSINIT(ktls, SI_SUB_SMP + 1, SI_ORDER_ANY, ktls_init, NULL);
399 #if defined(INET) || defined(INET6)
401 ktls_create_session(struct socket *so, struct tls_enable *en,
402 struct ktls_session **tlsp)
404 struct ktls_session *tls;
407 /* Only TLS 1.0 - 1.3 are supported. */
408 if (en->tls_vmajor != TLS_MAJOR_VER_ONE)
410 if (en->tls_vminor < TLS_MINOR_VER_ZERO ||
411 en->tls_vminor > TLS_MINOR_VER_THREE)
414 if (en->auth_key_len < 0 || en->auth_key_len > TLS_MAX_PARAM_SIZE)
416 if (en->cipher_key_len < 0 || en->cipher_key_len > TLS_MAX_PARAM_SIZE)
418 if (en->iv_len < 0 || en->iv_len > sizeof(tls->params.iv))
421 /* All supported algorithms require a cipher key. */
422 if (en->cipher_key_len == 0)
425 /* No flags are currently supported. */
429 /* Common checks for supported algorithms. */
430 switch (en->cipher_algorithm) {
431 case CRYPTO_AES_NIST_GCM_16:
433 * auth_algorithm isn't used, but permit GMAC values
436 switch (en->auth_algorithm) {
438 case CRYPTO_AES_128_NIST_GMAC:
439 case CRYPTO_AES_192_NIST_GMAC:
440 case CRYPTO_AES_256_NIST_GMAC:
445 if (en->auth_key_len != 0)
447 if ((en->tls_vminor == TLS_MINOR_VER_TWO &&
448 en->iv_len != TLS_AEAD_GCM_LEN) ||
449 (en->tls_vminor == TLS_MINOR_VER_THREE &&
450 en->iv_len != TLS_1_3_GCM_IV_LEN))
454 switch (en->auth_algorithm) {
455 case CRYPTO_SHA1_HMAC:
457 * TLS 1.0 requires an implicit IV. TLS 1.1+
458 * all use explicit IVs.
460 if (en->tls_vminor == TLS_MINOR_VER_ZERO) {
461 if (en->iv_len != TLS_CBC_IMPLICIT_IV_LEN)
467 case CRYPTO_SHA2_256_HMAC:
468 case CRYPTO_SHA2_384_HMAC:
469 /* Ignore any supplied IV. */
475 if (en->auth_key_len == 0)
482 tls = uma_zalloc(ktls_session_zone, M_WAITOK | M_ZERO);
484 counter_u64_add(ktls_offload_active, 1);
486 refcount_init(&tls->refcount, 1);
487 TASK_INIT(&tls->reset_tag_task, 0, ktls_reset_send_tag, tls);
489 tls->wq_index = ktls_get_cpu(so);
491 tls->params.cipher_algorithm = en->cipher_algorithm;
492 tls->params.auth_algorithm = en->auth_algorithm;
493 tls->params.tls_vmajor = en->tls_vmajor;
494 tls->params.tls_vminor = en->tls_vminor;
495 tls->params.flags = en->flags;
496 tls->params.max_frame_len = min(TLS_MAX_MSG_SIZE_V10_2, ktls_maxlen);
498 /* Set the header and trailer lengths. */
499 tls->params.tls_hlen = sizeof(struct tls_record_layer);
500 switch (en->cipher_algorithm) {
501 case CRYPTO_AES_NIST_GCM_16:
503 * TLS 1.2 uses a 4 byte implicit IV with an explicit 8 byte
504 * nonce. TLS 1.3 uses a 12 byte implicit IV.
506 if (en->tls_vminor < TLS_MINOR_VER_THREE)
507 tls->params.tls_hlen += sizeof(uint64_t);
508 tls->params.tls_tlen = AES_GMAC_HASH_LEN;
511 * TLS 1.3 includes optional padding which we
512 * do not support, and also puts the "real" record
513 * type at the end of the encrypted data.
515 if (en->tls_vminor == TLS_MINOR_VER_THREE)
516 tls->params.tls_tlen += sizeof(uint8_t);
518 tls->params.tls_bs = 1;
521 switch (en->auth_algorithm) {
522 case CRYPTO_SHA1_HMAC:
523 if (en->tls_vminor == TLS_MINOR_VER_ZERO) {
524 /* Implicit IV, no nonce. */
526 tls->params.tls_hlen += AES_BLOCK_LEN;
528 tls->params.tls_tlen = AES_BLOCK_LEN +
531 case CRYPTO_SHA2_256_HMAC:
532 tls->params.tls_hlen += AES_BLOCK_LEN;
533 tls->params.tls_tlen = AES_BLOCK_LEN +
536 case CRYPTO_SHA2_384_HMAC:
537 tls->params.tls_hlen += AES_BLOCK_LEN;
538 tls->params.tls_tlen = AES_BLOCK_LEN +
542 panic("invalid hmac");
544 tls->params.tls_bs = AES_BLOCK_LEN;
547 panic("invalid cipher");
550 KASSERT(tls->params.tls_hlen <= MBUF_PEXT_HDR_LEN,
551 ("TLS header length too long: %d", tls->params.tls_hlen));
552 KASSERT(tls->params.tls_tlen <= MBUF_PEXT_TRAIL_LEN,
553 ("TLS trailer length too long: %d", tls->params.tls_tlen));
555 if (en->auth_key_len != 0) {
556 tls->params.auth_key_len = en->auth_key_len;
557 tls->params.auth_key = malloc(en->auth_key_len, M_KTLS,
559 error = copyin(en->auth_key, tls->params.auth_key,
565 tls->params.cipher_key_len = en->cipher_key_len;
566 tls->params.cipher_key = malloc(en->cipher_key_len, M_KTLS, M_WAITOK);
567 error = copyin(en->cipher_key, tls->params.cipher_key,
573 * This holds the implicit portion of the nonce for GCM and
574 * the initial implicit IV for TLS 1.0. The explicit portions
575 * of the IV are generated in ktls_frame().
577 if (en->iv_len != 0) {
578 tls->params.iv_len = en->iv_len;
579 error = copyin(en->iv, tls->params.iv, en->iv_len);
584 * For TLS 1.2, generate an 8-byte nonce as a counter
585 * to generate unique explicit IVs.
587 * Store this counter in the last 8 bytes of the IV
588 * array so that it is 8-byte aligned.
590 if (en->cipher_algorithm == CRYPTO_AES_NIST_GCM_16 &&
591 en->tls_vminor == TLS_MINOR_VER_TWO)
592 arc4rand(tls->params.iv + 8, sizeof(uint64_t), 0);
603 static struct ktls_session *
604 ktls_clone_session(struct ktls_session *tls)
606 struct ktls_session *tls_new;
608 tls_new = uma_zalloc(ktls_session_zone, M_WAITOK | M_ZERO);
610 counter_u64_add(ktls_offload_active, 1);
612 refcount_init(&tls_new->refcount, 1);
614 /* Copy fields from existing session. */
615 tls_new->params = tls->params;
616 tls_new->wq_index = tls->wq_index;
618 /* Deep copy keys. */
619 if (tls_new->params.auth_key != NULL) {
620 tls_new->params.auth_key = malloc(tls->params.auth_key_len,
622 memcpy(tls_new->params.auth_key, tls->params.auth_key,
623 tls->params.auth_key_len);
626 tls_new->params.cipher_key = malloc(tls->params.cipher_key_len, M_KTLS,
628 memcpy(tls_new->params.cipher_key, tls->params.cipher_key,
629 tls->params.cipher_key_len);
636 ktls_cleanup(struct ktls_session *tls)
639 counter_u64_add(ktls_offload_active, -1);
641 case TCP_TLS_MODE_SW:
642 MPASS(tls->be != NULL);
643 switch (tls->params.cipher_algorithm) {
645 counter_u64_add(ktls_sw_cbc, -1);
647 case CRYPTO_AES_NIST_GCM_16:
648 counter_u64_add(ktls_sw_gcm, -1);
653 case TCP_TLS_MODE_IFNET:
654 switch (tls->params.cipher_algorithm) {
656 counter_u64_add(ktls_ifnet_cbc, -1);
658 case CRYPTO_AES_NIST_GCM_16:
659 counter_u64_add(ktls_ifnet_gcm, -1);
662 m_snd_tag_rele(tls->snd_tag);
665 case TCP_TLS_MODE_TOE:
666 switch (tls->params.cipher_algorithm) {
668 counter_u64_add(ktls_toe_cbc, -1);
670 case CRYPTO_AES_NIST_GCM_16:
671 counter_u64_add(ktls_toe_gcm, -1);
677 if (tls->params.auth_key != NULL) {
678 explicit_bzero(tls->params.auth_key, tls->params.auth_key_len);
679 free(tls->params.auth_key, M_KTLS);
680 tls->params.auth_key = NULL;
681 tls->params.auth_key_len = 0;
683 if (tls->params.cipher_key != NULL) {
684 explicit_bzero(tls->params.cipher_key,
685 tls->params.cipher_key_len);
686 free(tls->params.cipher_key, M_KTLS);
687 tls->params.cipher_key = NULL;
688 tls->params.cipher_key_len = 0;
690 explicit_bzero(tls->params.iv, sizeof(tls->params.iv));
693 #if defined(INET) || defined(INET6)
697 ktls_try_toe(struct socket *so, struct ktls_session *tls)
705 if (inp->inp_flags2 & INP_FREED) {
709 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
713 if (inp->inp_socket == NULL) {
718 if (tp->tod == NULL) {
723 error = tcp_offload_alloc_tls_session(tp, tls);
726 tls->mode = TCP_TLS_MODE_TOE;
727 switch (tls->params.cipher_algorithm) {
729 counter_u64_add(ktls_toe_cbc, 1);
731 case CRYPTO_AES_NIST_GCM_16:
732 counter_u64_add(ktls_toe_gcm, 1);
741 * Common code used when first enabling ifnet TLS on a connection or
742 * when allocating a new ifnet TLS session due to a routing change.
743 * This function allocates a new TLS send tag on whatever interface
744 * the connection is currently routed over.
747 ktls_alloc_snd_tag(struct inpcb *inp, struct ktls_session *tls, bool force,
748 struct m_snd_tag **mstp)
750 union if_snd_tag_alloc_params params;
757 if (inp->inp_flags2 & INP_FREED) {
761 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
765 if (inp->inp_socket == NULL) {
772 * Check administrative controls on ifnet TLS to determine if
773 * ifnet TLS should be denied.
775 * - Always permit 'force' requests.
776 * - ktls_ifnet_permitted == 0: always deny.
778 if (!force && ktls_ifnet_permitted == 0) {
784 * XXX: Use the cached route in the inpcb to find the
785 * interface. This should perhaps instead use
786 * rtalloc1_fib(dst, 0, 0, fibnum). Since KTLS is only
787 * enabled after a connection has completed key negotiation in
788 * userland, the cached route will be present in practice.
790 rt = inp->inp_route.ro_rt;
791 if (rt == NULL || rt->rt_ifp == NULL) {
798 params.hdr.type = IF_SND_TAG_TYPE_TLS;
799 params.hdr.flowid = inp->inp_flowid;
800 params.hdr.flowtype = inp->inp_flowtype;
801 params.tls.inp = inp;
802 params.tls.tls = tls;
805 if (ifp->if_snd_tag_alloc == NULL) {
809 if ((ifp->if_capenable & IFCAP_NOMAP) == 0) {
813 if (inp->inp_vflag & INP_IPV6) {
814 if ((ifp->if_capenable & IFCAP_TXTLS6) == 0) {
819 if ((ifp->if_capenable & IFCAP_TXTLS4) == 0) {
824 error = ifp->if_snd_tag_alloc(ifp, ¶ms, mstp);
831 ktls_try_ifnet(struct socket *so, struct ktls_session *tls, bool force)
833 struct m_snd_tag *mst;
836 error = ktls_alloc_snd_tag(so->so_pcb, tls, force, &mst);
838 tls->mode = TCP_TLS_MODE_IFNET;
840 switch (tls->params.cipher_algorithm) {
842 counter_u64_add(ktls_ifnet_cbc, 1);
844 case CRYPTO_AES_NIST_GCM_16:
845 counter_u64_add(ktls_ifnet_gcm, 1);
853 ktls_try_sw(struct socket *so, struct ktls_session *tls)
855 struct rm_priotracker prio;
856 struct ktls_crypto_backend *be;
859 * Choose the best software crypto backend. Backends are
860 * stored in sorted priority order (larget value == most
861 * important at the head of the list), so this just stops on
862 * the first backend that claims the session by returning
865 if (ktls_allow_unload)
866 rm_rlock(&ktls_backends_lock, &prio);
867 LIST_FOREACH(be, &ktls_backends, next) {
868 if (be->try(so, tls) == 0)
870 KASSERT(tls->cipher == NULL,
871 ("ktls backend leaked a cipher pointer"));
874 if (ktls_allow_unload)
878 if (ktls_allow_unload)
879 rm_runlock(&ktls_backends_lock, &prio);
882 tls->mode = TCP_TLS_MODE_SW;
883 switch (tls->params.cipher_algorithm) {
885 counter_u64_add(ktls_sw_cbc, 1);
887 case CRYPTO_AES_NIST_GCM_16:
888 counter_u64_add(ktls_sw_gcm, 1);
895 ktls_enable_tx(struct socket *so, struct tls_enable *en)
897 struct ktls_session *tls;
900 if (!ktls_offload_enable)
903 counter_u64_add(ktls_offload_enable_calls, 1);
906 * This should always be true since only the TCP socket option
907 * invokes this function.
909 if (so->so_proto->pr_protocol != IPPROTO_TCP)
913 * XXX: Don't overwrite existing sessions. We should permit
914 * this to support rekeying in the future.
916 if (so->so_snd.sb_tls_info != NULL)
919 if (en->cipher_algorithm == CRYPTO_AES_CBC && !ktls_cbc_enable)
922 /* TLS requires ext pgs */
923 if (mb_use_ext_pgs == 0)
926 error = ktls_create_session(so, en, &tls);
930 /* Prefer TOE -> ifnet TLS -> software TLS. */
932 error = ktls_try_toe(so, tls);
935 error = ktls_try_ifnet(so, tls, false);
937 error = ktls_try_sw(so, tls);
944 error = sblock(&so->so_snd, SBL_WAIT);
950 SOCKBUF_LOCK(&so->so_snd);
951 so->so_snd.sb_tls_info = tls;
952 if (tls->mode != TCP_TLS_MODE_SW)
953 so->so_snd.sb_flags |= SB_TLS_IFNET;
954 SOCKBUF_UNLOCK(&so->so_snd);
955 sbunlock(&so->so_snd);
957 counter_u64_add(ktls_offload_total, 1);
963 ktls_get_tx_mode(struct socket *so)
965 struct ktls_session *tls;
970 INP_WLOCK_ASSERT(inp);
971 SOCKBUF_LOCK(&so->so_snd);
972 tls = so->so_snd.sb_tls_info;
974 mode = TCP_TLS_MODE_NONE;
977 SOCKBUF_UNLOCK(&so->so_snd);
982 * Switch between SW and ifnet TLS sessions as requested.
985 ktls_set_tx_mode(struct socket *so, int mode)
987 struct ktls_session *tls, *tls_new;
992 case TCP_TLS_MODE_SW:
993 case TCP_TLS_MODE_IFNET:
1000 INP_WLOCK_ASSERT(inp);
1001 SOCKBUF_LOCK(&so->so_snd);
1002 tls = so->so_snd.sb_tls_info;
1004 SOCKBUF_UNLOCK(&so->so_snd);
1008 if (tls->mode == mode) {
1009 SOCKBUF_UNLOCK(&so->so_snd);
1013 tls = ktls_hold(tls);
1014 SOCKBUF_UNLOCK(&so->so_snd);
1017 tls_new = ktls_clone_session(tls);
1019 if (mode == TCP_TLS_MODE_IFNET)
1020 error = ktls_try_ifnet(so, tls_new, true);
1022 error = ktls_try_sw(so, tls_new);
1024 counter_u64_add(ktls_switch_failed, 1);
1031 error = sblock(&so->so_snd, SBL_WAIT);
1033 counter_u64_add(ktls_switch_failed, 1);
1041 * If we raced with another session change, keep the existing
1044 if (tls != so->so_snd.sb_tls_info) {
1045 counter_u64_add(ktls_switch_failed, 1);
1046 sbunlock(&so->so_snd);
1053 SOCKBUF_LOCK(&so->so_snd);
1054 so->so_snd.sb_tls_info = tls_new;
1055 if (tls_new->mode != TCP_TLS_MODE_SW)
1056 so->so_snd.sb_flags |= SB_TLS_IFNET;
1057 SOCKBUF_UNLOCK(&so->so_snd);
1058 sbunlock(&so->so_snd);
1061 * Drop two references on 'tls'. The first is for the
1062 * ktls_hold() above. The second drops the reference from the
1065 KASSERT(tls->refcount >= 2, ("too few references on old session"));
1069 if (mode == TCP_TLS_MODE_IFNET)
1070 counter_u64_add(ktls_switch_to_ifnet, 1);
1072 counter_u64_add(ktls_switch_to_sw, 1);
1079 * Try to allocate a new TLS send tag. This task is scheduled when
1080 * ip_output detects a route change while trying to transmit a packet
1081 * holding a TLS record. If a new tag is allocated, replace the tag
1082 * in the TLS session. Subsequent packets on the connection will use
1083 * the new tag. If a new tag cannot be allocated, drop the
1087 ktls_reset_send_tag(void *context, int pending)
1089 struct epoch_tracker et;
1090 struct ktls_session *tls;
1091 struct m_snd_tag *old, *new;
1096 MPASS(pending == 1);
1102 * Free the old tag first before allocating a new one.
1103 * ip[6]_output_send() will treat a NULL send tag the same as
1104 * an ifp mismatch and drop packets until a new tag is
1107 * Write-lock the INP when changing tls->snd_tag since
1108 * ip[6]_output_send() holds a read-lock when reading the
1113 tls->snd_tag = NULL;
1116 m_snd_tag_rele(old);
1118 error = ktls_alloc_snd_tag(inp, tls, true, &new);
1123 mtx_pool_lock(mtxpool_sleep, tls);
1124 tls->reset_pending = false;
1125 mtx_pool_unlock(mtxpool_sleep, tls);
1126 if (!in_pcbrele_wlocked(inp))
1129 counter_u64_add(ktls_ifnet_reset, 1);
1132 * XXX: Should we kick tcp_output explicitly now that
1133 * the send tag is fixed or just rely on timers?
1136 NET_EPOCH_ENTER(et);
1138 if (!in_pcbrele_wlocked(inp)) {
1139 if (!(inp->inp_flags & INP_TIMEWAIT) &&
1140 !(inp->inp_flags & INP_DROPPED)) {
1141 tp = intotcpcb(inp);
1142 tp = tcp_drop(tp, ECONNABORTED);
1145 counter_u64_add(ktls_ifnet_reset_dropped, 1);
1151 counter_u64_add(ktls_ifnet_reset_failed, 1);
1154 * Leave reset_pending true to avoid future tasks while
1155 * the socket goes away.
1163 ktls_output_eagain(struct inpcb *inp, struct ktls_session *tls)
1169 INP_LOCK_ASSERT(inp);
1172 * See if we should schedule a task to update the send tag for
1175 mtx_pool_lock(mtxpool_sleep, tls);
1176 if (!tls->reset_pending) {
1177 (void) ktls_hold(tls);
1180 tls->reset_pending = true;
1181 taskqueue_enqueue(taskqueue_thread, &tls->reset_tag_task);
1183 mtx_pool_unlock(mtxpool_sleep, tls);
1189 ktls_destroy(struct ktls_session *tls)
1191 struct rm_priotracker prio;
1194 if (tls->be != NULL && ktls_allow_unload) {
1195 rm_rlock(&ktls_backends_lock, &prio);
1196 tls->be->use_count--;
1197 rm_runlock(&ktls_backends_lock, &prio);
1199 uma_zfree(ktls_session_zone, tls);
1203 ktls_seq(struct sockbuf *sb, struct mbuf *m)
1205 struct mbuf_ext_pgs *pgs;
1207 for (; m != NULL; m = m->m_next) {
1208 KASSERT((m->m_flags & M_NOMAP) != 0,
1209 ("ktls_seq: mapped mbuf %p", m));
1211 pgs = m->m_ext.ext_pgs;
1212 pgs->seqno = sb->sb_tls_seqno;
1218 * Add TLS framing (headers and trailers) to a chain of mbufs. Each
1219 * mbuf in the chain must be an unmapped mbuf. The payload of the
1220 * mbuf must be populated with the payload of each TLS record.
1222 * The record_type argument specifies the TLS record type used when
1223 * populating the TLS header.
1225 * The enq_count argument on return is set to the number of pages of
1226 * payload data for this entire chain that need to be encrypted via SW
1227 * encryption. The returned value should be passed to ktls_enqueue
1228 * when scheduling encryption of this chain of mbufs.
1231 ktls_frame(struct mbuf *top, struct ktls_session *tls, int *enq_cnt,
1232 uint8_t record_type)
1234 struct tls_record_layer *tlshdr;
1236 struct mbuf_ext_pgs *pgs;
1241 maxlen = tls->params.max_frame_len;
1243 for (m = top; m != NULL; m = m->m_next) {
1245 * All mbufs in the chain should be non-empty TLS
1246 * records whose payload does not exceed the maximum
1249 if (m->m_len > maxlen || m->m_len == 0)
1254 * TLS frames require unmapped mbufs to store session
1257 KASSERT((m->m_flags & M_NOMAP) != 0,
1258 ("ktls_frame: mapped mbuf %p (top = %p)\n", m, top));
1260 pgs = m->m_ext.ext_pgs;
1262 /* Save a reference to the session. */
1263 pgs->tls = ktls_hold(tls);
1265 pgs->hdr_len = tls->params.tls_hlen;
1266 pgs->trail_len = tls->params.tls_tlen;
1267 if (tls->params.cipher_algorithm == CRYPTO_AES_CBC) {
1271 * AES-CBC pads messages to a multiple of the
1272 * block size. Note that the padding is
1273 * applied after the digest and the encryption
1274 * is done on the "plaintext || mac || padding".
1275 * At least one byte of padding is always
1278 * Compute the final trailer length assuming
1279 * at most one block of padding.
1280 * tls->params.sb_tls_tlen is the maximum
1281 * possible trailer length (padding + digest).
1282 * delta holds the number of excess padding
1283 * bytes if the maximum were used. Those
1284 * extra bytes are removed.
1286 bs = tls->params.tls_bs;
1287 delta = (tls_len + tls->params.tls_tlen) & (bs - 1);
1288 pgs->trail_len -= delta;
1290 m->m_len += pgs->hdr_len + pgs->trail_len;
1292 /* Populate the TLS header. */
1293 tlshdr = (void *)pgs->hdr;
1294 tlshdr->tls_vmajor = tls->params.tls_vmajor;
1297 * TLS 1.3 masquarades as TLS 1.2 with a record type
1298 * of TLS_RLTYPE_APP.
1300 if (tls->params.tls_vminor == TLS_MINOR_VER_THREE &&
1301 tls->params.tls_vmajor == TLS_MAJOR_VER_ONE) {
1302 tlshdr->tls_vminor = TLS_MINOR_VER_TWO;
1303 tlshdr->tls_type = TLS_RLTYPE_APP;
1304 /* save the real record type for later */
1305 pgs->record_type = record_type;
1307 tlshdr->tls_vminor = tls->params.tls_vminor;
1308 tlshdr->tls_type = record_type;
1310 tlshdr->tls_length = htons(m->m_len - sizeof(*tlshdr));
1313 * Store nonces / explicit IVs after the end of the
1316 * For GCM with TLS 1.2, an 8 byte nonce is copied
1317 * from the end of the IV. The nonce is then
1318 * incremented for use by the next record.
1320 * For CBC, a random nonce is inserted for TLS 1.1+.
1322 if (tls->params.cipher_algorithm == CRYPTO_AES_NIST_GCM_16 &&
1323 tls->params.tls_vminor == TLS_MINOR_VER_TWO) {
1324 noncep = (uint64_t *)(tls->params.iv + 8);
1325 be64enc(tlshdr + 1, *noncep);
1327 } else if (tls->params.cipher_algorithm == CRYPTO_AES_CBC &&
1328 tls->params.tls_vminor >= TLS_MINOR_VER_ONE)
1329 arc4rand(tlshdr + 1, AES_BLOCK_LEN, 0);
1332 * When using SW encryption, mark the mbuf not ready.
1333 * It will be marked ready via sbready() after the
1334 * record has been encrypted.
1336 * When using ifnet TLS, unencrypted TLS records are
1337 * sent down the stack to the NIC.
1339 if (tls->mode == TCP_TLS_MODE_SW) {
1340 m->m_flags |= M_NOTREADY;
1341 pgs->nrdy = pgs->npgs;
1342 *enq_cnt += pgs->npgs;
1349 ktls_enqueue_to_free(struct mbuf_ext_pgs *pgs)
1354 /* Mark it for freeing. */
1356 wq = &ktls_wq[pgs->tls->wq_index];
1358 STAILQ_INSERT_TAIL(&wq->head, pgs, stailq);
1359 running = wq->running;
1360 mtx_unlock(&wq->mtx);
1366 ktls_enqueue(struct mbuf *m, struct socket *so, int page_count)
1368 struct mbuf_ext_pgs *pgs;
1372 KASSERT(((m->m_flags & (M_NOMAP | M_NOTREADY)) ==
1373 (M_NOMAP | M_NOTREADY)),
1374 ("ktls_enqueue: %p not unready & nomap mbuf\n", m));
1375 KASSERT(page_count != 0, ("enqueueing TLS mbuf with zero page count"));
1377 pgs = m->m_ext.ext_pgs;
1379 KASSERT(pgs->tls->mode == TCP_TLS_MODE_SW, ("!SW TLS mbuf"));
1381 pgs->enc_cnt = page_count;
1385 * Save a pointer to the socket. The caller is responsible
1386 * for taking an additional reference via soref().
1390 wq = &ktls_wq[pgs->tls->wq_index];
1392 STAILQ_INSERT_TAIL(&wq->head, pgs, stailq);
1393 running = wq->running;
1394 mtx_unlock(&wq->mtx);
1397 counter_u64_add(ktls_cnt_on, 1);
1400 static __noinline void
1401 ktls_encrypt(struct mbuf_ext_pgs *pgs)
1403 struct ktls_session *tls;
1405 struct mbuf *m, *top;
1406 vm_paddr_t parray[1 + btoc(TLS_MAX_MSG_SIZE_V10_2)];
1407 struct iovec src_iov[1 + btoc(TLS_MAX_MSG_SIZE_V10_2)];
1408 struct iovec dst_iov[1 + btoc(TLS_MAX_MSG_SIZE_V10_2)];
1410 int error, i, len, npages, off, total_pages;
1416 KASSERT(tls != NULL, ("tls = NULL, top = %p, pgs = %p\n", top, pgs));
1417 KASSERT(so != NULL, ("so = NULL, top = %p, pgs = %p\n", top, pgs));
1422 total_pages = pgs->enc_cnt;
1426 * Encrypt the TLS records in the chain of mbufs starting with
1427 * 'top'. 'total_pages' gives us a total count of pages and is
1428 * used to know when we have finished encrypting the TLS
1429 * records originally queued with 'top'.
1431 * NB: These mbufs are queued in the socket buffer and
1432 * 'm_next' is traversing the mbufs in the socket buffer. The
1433 * socket buffer lock is not held while traversing this chain.
1434 * Since the mbufs are all marked M_NOTREADY their 'm_next'
1435 * pointers should be stable. However, the 'm_next' of the
1436 * last mbuf encrypted is not necessarily NULL. It can point
1437 * to other mbufs appended while 'top' was on the TLS work
1440 * Each mbuf holds an entire TLS record.
1443 for (m = top; npages != total_pages; m = m->m_next) {
1444 pgs = m->m_ext.ext_pgs;
1446 KASSERT(pgs->tls == tls,
1447 ("different TLS sessions in a single mbuf chain: %p vs %p",
1449 KASSERT((m->m_flags & (M_NOMAP | M_NOTREADY)) ==
1450 (M_NOMAP | M_NOTREADY),
1451 ("%p not unready & nomap mbuf (top = %p)\n", m, top));
1452 KASSERT(npages + pgs->npgs <= total_pages,
1453 ("page count mismatch: top %p, total_pages %d, m %p", top,
1457 * Generate source and destination ivoecs to pass to
1458 * the SW encryption backend. For writable mbufs, the
1459 * destination iovec is a copy of the source and
1460 * encryption is done in place. For file-backed mbufs
1461 * (from sendfile), anonymous wired pages are
1462 * allocated and assigned to the destination iovec.
1464 is_anon = (pgs->flags & MBUF_PEXT_FLAG_ANON) != 0;
1466 off = pgs->first_pg_off;
1467 for (i = 0; i < pgs->npgs; i++, off = 0) {
1468 len = mbuf_ext_pg_len(pgs, i, off);
1469 src_iov[i].iov_len = len;
1470 src_iov[i].iov_base =
1471 (char *)(void *)PHYS_TO_DMAP(pgs->pa[i]) + off;
1474 dst_iov[i].iov_base = src_iov[i].iov_base;
1475 dst_iov[i].iov_len = src_iov[i].iov_len;
1479 pg = vm_page_alloc(NULL, 0, VM_ALLOC_NORMAL |
1480 VM_ALLOC_NOOBJ | VM_ALLOC_NODUMP | VM_ALLOC_WIRED);
1485 parray[i] = VM_PAGE_TO_PHYS(pg);
1486 dst_iov[i].iov_base =
1487 (char *)(void *)PHYS_TO_DMAP(parray[i]) + off;
1488 dst_iov[i].iov_len = len;
1493 error = (*tls->sw_encrypt)(tls,
1494 (const struct tls_record_layer *)pgs->hdr,
1495 pgs->trail, src_iov, dst_iov, i, pgs->seqno,
1498 counter_u64_add(ktls_offload_failed_crypto, 1);
1503 * For file-backed mbufs, release the file-backed
1504 * pages and replace them in the ext_pgs array with
1505 * the anonymous wired pages allocated above.
1508 /* Free the old pages. */
1509 m->m_ext.ext_free(m);
1511 /* Replace them with the new pages. */
1512 for (i = 0; i < pgs->npgs; i++)
1513 pgs->pa[i] = parray[i];
1515 /* Use the basic free routine. */
1516 m->m_ext.ext_free = mb_free_mext_pgs;
1518 /* Pages are now writable. */
1519 pgs->flags |= MBUF_PEXT_FLAG_ANON;
1523 * Drop a reference to the session now that it is no
1524 * longer needed. Existing code depends on encrypted
1525 * records having no associated session vs
1526 * yet-to-be-encrypted records having an associated
1533 CURVNET_SET(so->so_vnet);
1535 (void)(*so->so_proto->pr_usrreqs->pru_ready)(so, top, npages);
1537 so->so_proto->pr_usrreqs->pru_abort(so);
1539 mb_free_notready(top, total_pages);
1548 ktls_work_thread(void *ctx)
1550 struct ktls_wq *wq = ctx;
1551 struct mbuf_ext_pgs *p, *n;
1552 struct ktls_session *tls;
1553 STAILQ_HEAD(, mbuf_ext_pgs) local_head;
1555 #if defined(__aarch64__) || defined(__amd64__) || defined(__i386__)
1560 while (STAILQ_EMPTY(&wq->head)) {
1561 wq->running = false;
1562 mtx_sleep(wq, &wq->mtx, 0, "-", 0);
1566 STAILQ_INIT(&local_head);
1567 STAILQ_CONCAT(&local_head, &wq->head);
1568 mtx_unlock(&wq->mtx);
1570 STAILQ_FOREACH_SAFE(p, &local_head, stailq, n) {
1571 if (p->mbuf != NULL) {
1573 counter_u64_add(ktls_cnt_on, -1);
1577 uma_zfree(zone_extpgs, p);