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freebsd-dev/sys/kern/uipc_ktls.c
John Baldwin cd0525f615 ktls: Write-lock the INP when changing a transmit TLS session. 
The TCP rate pacing code relies on being able to read this pointer
safely while holding an INP lock.  The initial TLS session pointer is
set while holding the write lock already.

Reviewed by:	gallatin, hselasky
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D34086
2022-02-11 15:16:25 -08:00

2891 lines
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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2014-2019 Netflix Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_kern_tls.h"
#include "opt_ratelimit.h"
#include "opt_rss.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/domainset.h>
#include <sys/endian.h>
#include <sys/ktls.h>
#include <sys/lock.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/rmlock.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/refcount.h>
#include <sys/smp.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/taskqueue.h>
#include <sys/kthread.h>
#include <sys/uio.h>
#include <sys/vmmeter.h>
#if defined(__aarch64__) || defined(__amd64__) || defined(__i386__)
#include <machine/pcb.h>
#endif
#include <machine/vmparam.h>
#include <net/if.h>
#include <net/if_var.h>
#ifdef RSS
#include <net/netisr.h>
#include <net/rss_config.h>
#endif
#include <net/route.h>
#include <net/route/nhop.h>
#if defined(INET) || defined(INET6)
#include <netinet/in.h>
#include <netinet/in_pcb.h>
#endif
#include <netinet/tcp_var.h>
#ifdef TCP_OFFLOAD
#include <netinet/tcp_offload.h>
#endif
#include <opencrypto/cryptodev.h>
#include <opencrypto/ktls.h>
#include <vm/uma_dbg.h>
#include <vm/vm.h>
#include <vm/vm_pageout.h>
#include <vm/vm_page.h>
#include <vm/vm_pagequeue.h>
struct ktls_wq {
struct mtx mtx;
STAILQ_HEAD(, mbuf) m_head;
STAILQ_HEAD(, socket) so_head;
bool running;
int lastallocfail;
} __aligned(CACHE_LINE_SIZE);
struct ktls_alloc_thread {
uint64_t wakeups;
uint64_t allocs;
struct thread *td;
int running;
};
struct ktls_domain_info {
int count;
int cpu[MAXCPU];
struct ktls_alloc_thread alloc_td;
};
struct ktls_domain_info ktls_domains[MAXMEMDOM];
static struct ktls_wq *ktls_wq;
static struct proc *ktls_proc;
static uma_zone_t ktls_session_zone;
static uma_zone_t ktls_buffer_zone;
static uint16_t ktls_cpuid_lookup[MAXCPU];
static int ktls_init_state;
static struct sx ktls_init_lock;
SX_SYSINIT(ktls_init_lock, &ktls_init_lock, "ktls init");
SYSCTL_NODE(_kern_ipc, OID_AUTO, tls, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Kernel TLS offload");
SYSCTL_NODE(_kern_ipc_tls, OID_AUTO, stats, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Kernel TLS offload stats");
#ifdef RSS
static int ktls_bind_threads = 1;
#else
static int ktls_bind_threads;
#endif
SYSCTL_INT(_kern_ipc_tls, OID_AUTO, bind_threads, CTLFLAG_RDTUN,
&ktls_bind_threads, 0,
"Bind crypto threads to cores (1) or cores and domains (2) at boot");
static u_int ktls_maxlen = 16384;
SYSCTL_UINT(_kern_ipc_tls, OID_AUTO, maxlen, CTLFLAG_RDTUN,
&ktls_maxlen, 0, "Maximum TLS record size");
static int ktls_number_threads;
SYSCTL_INT(_kern_ipc_tls_stats, OID_AUTO, threads, CTLFLAG_RD,
&ktls_number_threads, 0,
"Number of TLS threads in thread-pool");
unsigned int ktls_ifnet_max_rexmit_pct = 2;
SYSCTL_UINT(_kern_ipc_tls, OID_AUTO, ifnet_max_rexmit_pct, CTLFLAG_RWTUN,
&ktls_ifnet_max_rexmit_pct, 2,
"Max percent bytes retransmitted before ifnet TLS is disabled");
static bool ktls_offload_enable;
SYSCTL_BOOL(_kern_ipc_tls, OID_AUTO, enable, CTLFLAG_RWTUN,
&ktls_offload_enable, 0,
"Enable support for kernel TLS offload");
static bool ktls_cbc_enable = true;
SYSCTL_BOOL(_kern_ipc_tls, OID_AUTO, cbc_enable, CTLFLAG_RWTUN,
&ktls_cbc_enable, 1,
"Enable Support of AES-CBC crypto for kernel TLS");
static bool ktls_sw_buffer_cache = true;
SYSCTL_BOOL(_kern_ipc_tls, OID_AUTO, sw_buffer_cache, CTLFLAG_RDTUN,
&ktls_sw_buffer_cache, 1,
"Enable caching of output buffers for SW encryption");
static int ktls_max_alloc = 128;
SYSCTL_INT(_kern_ipc_tls, OID_AUTO, max_alloc, CTLFLAG_RWTUN,
&ktls_max_alloc, 128,
"Max number of 16k buffers to allocate in thread context");
static COUNTER_U64_DEFINE_EARLY(ktls_tasks_active);
SYSCTL_COUNTER_U64(_kern_ipc_tls, OID_AUTO, tasks_active, CTLFLAG_RD,
&ktls_tasks_active, "Number of active tasks");
static COUNTER_U64_DEFINE_EARLY(ktls_cnt_tx_pending);
SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, sw_tx_pending, CTLFLAG_RD,
&ktls_cnt_tx_pending,
"Number of TLS 1.0 records waiting for earlier TLS records");
static COUNTER_U64_DEFINE_EARLY(ktls_cnt_tx_queued);
SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, sw_tx_inqueue, CTLFLAG_RD,
&ktls_cnt_tx_queued,
"Number of TLS records in queue to tasks for SW encryption");
static COUNTER_U64_DEFINE_EARLY(ktls_cnt_rx_queued);
SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, sw_rx_inqueue, CTLFLAG_RD,
&ktls_cnt_rx_queued,
"Number of TLS sockets in queue to tasks for SW decryption");
static COUNTER_U64_DEFINE_EARLY(ktls_offload_total);
SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, offload_total,
CTLFLAG_RD, &ktls_offload_total,
"Total successful TLS setups (parameters set)");
static COUNTER_U64_DEFINE_EARLY(ktls_offload_enable_calls);
SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, enable_calls,
CTLFLAG_RD, &ktls_offload_enable_calls,
"Total number of TLS enable calls made");
static COUNTER_U64_DEFINE_EARLY(ktls_offload_active);
SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, active, CTLFLAG_RD,
&ktls_offload_active, "Total Active TLS sessions");
static COUNTER_U64_DEFINE_EARLY(ktls_offload_corrupted_records);
SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, corrupted_records, CTLFLAG_RD,
&ktls_offload_corrupted_records, "Total corrupted TLS records received");
static COUNTER_U64_DEFINE_EARLY(ktls_offload_failed_crypto);
SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, failed_crypto, CTLFLAG_RD,
&ktls_offload_failed_crypto, "Total TLS crypto failures");
static COUNTER_U64_DEFINE_EARLY(ktls_switch_to_ifnet);
SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, switch_to_ifnet, CTLFLAG_RD,
&ktls_switch_to_ifnet, "TLS sessions switched from SW to ifnet");
static COUNTER_U64_DEFINE_EARLY(ktls_switch_to_sw);
SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, switch_to_sw, CTLFLAG_RD,
&ktls_switch_to_sw, "TLS sessions switched from ifnet to SW");
static COUNTER_U64_DEFINE_EARLY(ktls_switch_failed);
SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, switch_failed, CTLFLAG_RD,
&ktls_switch_failed, "TLS sessions unable to switch between SW and ifnet");
static COUNTER_U64_DEFINE_EARLY(ktls_ifnet_disable_fail);
SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, ifnet_disable_failed, CTLFLAG_RD,
&ktls_ifnet_disable_fail, "TLS sessions unable to switch to SW from ifnet");
static COUNTER_U64_DEFINE_EARLY(ktls_ifnet_disable_ok);
SYSCTL_COUNTER_U64(_kern_ipc_tls_stats, OID_AUTO, ifnet_disable_ok, CTLFLAG_RD,
&ktls_ifnet_disable_ok, "TLS sessions able to switch to SW from ifnet");
SYSCTL_NODE(_kern_ipc_tls, OID_AUTO, sw, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
"Software TLS session stats");
SYSCTL_NODE(_kern_ipc_tls, OID_AUTO, ifnet, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
"Hardware (ifnet) TLS session stats");
#ifdef TCP_OFFLOAD
SYSCTL_NODE(_kern_ipc_tls, OID_AUTO, toe, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
"TOE TLS session stats");
#endif
static COUNTER_U64_DEFINE_EARLY(ktls_sw_cbc);
SYSCTL_COUNTER_U64(_kern_ipc_tls_sw, OID_AUTO, cbc, CTLFLAG_RD, &ktls_sw_cbc,
"Active number of software TLS sessions using AES-CBC");
static COUNTER_U64_DEFINE_EARLY(ktls_sw_gcm);
SYSCTL_COUNTER_U64(_kern_ipc_tls_sw, OID_AUTO, gcm, CTLFLAG_RD, &ktls_sw_gcm,
"Active number of software TLS sessions using AES-GCM");
static COUNTER_U64_DEFINE_EARLY(ktls_sw_chacha20);
SYSCTL_COUNTER_U64(_kern_ipc_tls_sw, OID_AUTO, chacha20, CTLFLAG_RD,
&ktls_sw_chacha20,
"Active number of software TLS sessions using Chacha20-Poly1305");
static COUNTER_U64_DEFINE_EARLY(ktls_ifnet_cbc);
SYSCTL_COUNTER_U64(_kern_ipc_tls_ifnet, OID_AUTO, cbc, CTLFLAG_RD,
&ktls_ifnet_cbc,
"Active number of ifnet TLS sessions using AES-CBC");
static COUNTER_U64_DEFINE_EARLY(ktls_ifnet_gcm);
SYSCTL_COUNTER_U64(_kern_ipc_tls_ifnet, OID_AUTO, gcm, CTLFLAG_RD,
&ktls_ifnet_gcm,
"Active number of ifnet TLS sessions using AES-GCM");
static COUNTER_U64_DEFINE_EARLY(ktls_ifnet_chacha20);
SYSCTL_COUNTER_U64(_kern_ipc_tls_ifnet, OID_AUTO, chacha20, CTLFLAG_RD,
&ktls_ifnet_chacha20,
"Active number of ifnet TLS sessions using Chacha20-Poly1305");
static COUNTER_U64_DEFINE_EARLY(ktls_ifnet_reset);
SYSCTL_COUNTER_U64(_kern_ipc_tls_ifnet, OID_AUTO, reset, CTLFLAG_RD,
&ktls_ifnet_reset, "TLS sessions updated to a new ifnet send tag");
static COUNTER_U64_DEFINE_EARLY(ktls_ifnet_reset_dropped);
SYSCTL_COUNTER_U64(_kern_ipc_tls_ifnet, OID_AUTO, reset_dropped, CTLFLAG_RD,
&ktls_ifnet_reset_dropped,
"TLS sessions dropped after failing to update ifnet send tag");
static COUNTER_U64_DEFINE_EARLY(ktls_ifnet_reset_failed);
SYSCTL_COUNTER_U64(_kern_ipc_tls_ifnet, OID_AUTO, reset_failed, CTLFLAG_RD,
&ktls_ifnet_reset_failed,
"TLS sessions that failed to allocate a new ifnet send tag");
static int ktls_ifnet_permitted;
SYSCTL_UINT(_kern_ipc_tls_ifnet, OID_AUTO, permitted, CTLFLAG_RWTUN,
&ktls_ifnet_permitted, 1,
"Whether to permit hardware (ifnet) TLS sessions");
#ifdef TCP_OFFLOAD
static COUNTER_U64_DEFINE_EARLY(ktls_toe_cbc);
SYSCTL_COUNTER_U64(_kern_ipc_tls_toe, OID_AUTO, cbc, CTLFLAG_RD,
&ktls_toe_cbc,
"Active number of TOE TLS sessions using AES-CBC");
static COUNTER_U64_DEFINE_EARLY(ktls_toe_gcm);
SYSCTL_COUNTER_U64(_kern_ipc_tls_toe, OID_AUTO, gcm, CTLFLAG_RD,
&ktls_toe_gcm,
"Active number of TOE TLS sessions using AES-GCM");
static COUNTER_U64_DEFINE_EARLY(ktls_toe_chacha20);
SYSCTL_COUNTER_U64(_kern_ipc_tls_toe, OID_AUTO, chacha20, CTLFLAG_RD,
&ktls_toe_chacha20,
"Active number of TOE TLS sessions using Chacha20-Poly1305");
#endif
static MALLOC_DEFINE(M_KTLS, "ktls", "Kernel TLS");
static void ktls_cleanup(struct ktls_session *tls);
#if defined(INET) || defined(INET6)
static void ktls_reset_send_tag(void *context, int pending);
#endif
static void ktls_work_thread(void *ctx);
static void ktls_alloc_thread(void *ctx);
#if defined(INET) || defined(INET6)
static u_int
ktls_get_cpu(struct socket *so)
{
struct inpcb *inp;
#ifdef NUMA
struct ktls_domain_info *di;
#endif
u_int cpuid;
inp = sotoinpcb(so);
#ifdef RSS
cpuid = rss_hash2cpuid(inp->inp_flowid, inp->inp_flowtype);
if (cpuid != NETISR_CPUID_NONE)
return (cpuid);
#endif
/*
* Just use the flowid to shard connections in a repeatable
* fashion. Note that TLS 1.0 sessions rely on the
* serialization provided by having the same connection use
* the same queue.
*/
#ifdef NUMA
if (ktls_bind_threads > 1 && inp->inp_numa_domain != M_NODOM) {
di = &ktls_domains[inp->inp_numa_domain];
cpuid = di->cpu[inp->inp_flowid % di->count];
} else
#endif
cpuid = ktls_cpuid_lookup[inp->inp_flowid % ktls_number_threads];
return (cpuid);
}
#endif
static int
ktls_buffer_import(void *arg, void **store, int count, int domain, int flags)
{
vm_page_t m;
int i, req;
KASSERT((ktls_maxlen & PAGE_MASK) == 0,
("%s: ktls max length %d is not page size-aligned",
__func__, ktls_maxlen));
req = VM_ALLOC_WIRED | VM_ALLOC_NODUMP | malloc2vm_flags(flags);
for (i = 0; i < count; i++) {
m = vm_page_alloc_noobj_contig_domain(domain, req,
atop(ktls_maxlen), 0, ~0ul, PAGE_SIZE, 0,
VM_MEMATTR_DEFAULT);
if (m == NULL)
break;
store[i] = (void *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(m));
}
return (i);
}
static void
ktls_buffer_release(void *arg __unused, void **store, int count)
{
vm_page_t m;
int i, j;
for (i = 0; i < count; i++) {
m = PHYS_TO_VM_PAGE(DMAP_TO_PHYS((vm_offset_t)store[i]));
for (j = 0; j < atop(ktls_maxlen); j++) {
(void)vm_page_unwire_noq(m + j);
vm_page_free(m + j);
}
}
}
static void
ktls_free_mext_contig(struct mbuf *m)
{
M_ASSERTEXTPG(m);
uma_zfree(ktls_buffer_zone, (void *)PHYS_TO_DMAP(m->m_epg_pa[0]));
}
static int
ktls_init(void)
{
struct thread *td;
struct pcpu *pc;
int count, domain, error, i;
ktls_wq = malloc(sizeof(*ktls_wq) * (mp_maxid + 1), M_KTLS,
M_WAITOK | M_ZERO);
ktls_session_zone = uma_zcreate("ktls_session",
sizeof(struct ktls_session),
NULL, NULL, NULL, NULL,
UMA_ALIGN_CACHE, 0);
if (ktls_sw_buffer_cache) {
ktls_buffer_zone = uma_zcache_create("ktls_buffers",
roundup2(ktls_maxlen, PAGE_SIZE), NULL, NULL, NULL, NULL,
ktls_buffer_import, ktls_buffer_release, NULL,
UMA_ZONE_FIRSTTOUCH);
}
/*
* Initialize the workqueues to run the TLS work. We create a
* work queue for each CPU.
*/
CPU_FOREACH(i) {
STAILQ_INIT(&ktls_wq[i].m_head);
STAILQ_INIT(&ktls_wq[i].so_head);
mtx_init(&ktls_wq[i].mtx, "ktls work queue", NULL, MTX_DEF);
if (ktls_bind_threads > 1) {
pc = pcpu_find(i);
domain = pc->pc_domain;
count = ktls_domains[domain].count;
ktls_domains[domain].cpu[count] = i;
ktls_domains[domain].count++;
}
ktls_cpuid_lookup[ktls_number_threads] = i;
ktls_number_threads++;
}
/*
* If we somehow have an empty domain, fall back to choosing
* among all KTLS threads.
*/
if (ktls_bind_threads > 1) {
for (i = 0; i < vm_ndomains; i++) {
if (ktls_domains[i].count == 0) {
ktls_bind_threads = 1;
break;
}
}
}
/* Start kthreads for each workqueue. */
CPU_FOREACH(i) {
error = kproc_kthread_add(ktls_work_thread, &ktls_wq[i],
&ktls_proc, &td, 0, 0, "KTLS", "thr_%d", i);
if (error) {
printf("Can't add KTLS thread %d error %d\n", i, error);
return (error);
}
}
/*
* Start an allocation thread per-domain to perform blocking allocations
* of 16k physically contiguous TLS crypto destination buffers.
*/
if (ktls_sw_buffer_cache) {
for (domain = 0; domain < vm_ndomains; domain++) {
if (VM_DOMAIN_EMPTY(domain))
continue;
if (CPU_EMPTY(&cpuset_domain[domain]))
continue;
error = kproc_kthread_add(ktls_alloc_thread,
&ktls_domains[domain], &ktls_proc,
&ktls_domains[domain].alloc_td.td,
0, 0, "KTLS", "alloc_%d", domain);
if (error) {
printf("Can't add KTLS alloc thread %d error %d\n",
domain, error);
return (error);
}
}
}
if (bootverbose)
printf("KTLS: Initialized %d threads\n", ktls_number_threads);
return (0);
}
static int
ktls_start_kthreads(void)
{
int error, state;
start:
state = atomic_load_acq_int(&ktls_init_state);
if (__predict_true(state > 0))
return (0);
if (state < 0)
return (ENXIO);
sx_xlock(&ktls_init_lock);
if (ktls_init_state != 0) {
sx_xunlock(&ktls_init_lock);
goto start;
}
error = ktls_init();
if (error == 0)
state = 1;
else
state = -1;
atomic_store_rel_int(&ktls_init_state, state);
sx_xunlock(&ktls_init_lock);
return (error);
}
#if defined(INET) || defined(INET6)
static int
ktls_create_session(struct socket *so, struct tls_enable *en,
struct ktls_session **tlsp)
{
struct ktls_session *tls;
int error;
/* Only TLS 1.0 - 1.3 are supported. */
if (en->tls_vmajor != TLS_MAJOR_VER_ONE)
return (EINVAL);
if (en->tls_vminor < TLS_MINOR_VER_ZERO ||
en->tls_vminor > TLS_MINOR_VER_THREE)
return (EINVAL);
if (en->auth_key_len < 0 || en->auth_key_len > TLS_MAX_PARAM_SIZE)
return (EINVAL);
if (en->cipher_key_len < 0 || en->cipher_key_len > TLS_MAX_PARAM_SIZE)
return (EINVAL);
if (en->iv_len < 0 || en->iv_len > sizeof(tls->params.iv))
return (EINVAL);
/* All supported algorithms require a cipher key. */
if (en->cipher_key_len == 0)
return (EINVAL);
/* No flags are currently supported. */
if (en->flags != 0)
return (EINVAL);
/* Common checks for supported algorithms. */
switch (en->cipher_algorithm) {
case CRYPTO_AES_NIST_GCM_16:
/*
* auth_algorithm isn't used, but permit GMAC values
* for compatibility.
*/
switch (en->auth_algorithm) {
case 0:
#ifdef COMPAT_FREEBSD12
/* XXX: Really 13.0-current COMPAT. */
case CRYPTO_AES_128_NIST_GMAC:
case CRYPTO_AES_192_NIST_GMAC:
case CRYPTO_AES_256_NIST_GMAC:
#endif
break;
default:
return (EINVAL);
}
if (en->auth_key_len != 0)
return (EINVAL);
switch (en->tls_vminor) {
case TLS_MINOR_VER_TWO:
if (en->iv_len != TLS_AEAD_GCM_LEN)
return (EINVAL);
break;
case TLS_MINOR_VER_THREE:
if (en->iv_len != TLS_1_3_GCM_IV_LEN)
return (EINVAL);
break;
default:
return (EINVAL);
}
break;
case CRYPTO_AES_CBC:
switch (en->auth_algorithm) {
case CRYPTO_SHA1_HMAC:
break;
case CRYPTO_SHA2_256_HMAC:
case CRYPTO_SHA2_384_HMAC:
if (en->tls_vminor != TLS_MINOR_VER_TWO)
return (EINVAL);
break;
default:
return (EINVAL);
}
if (en->auth_key_len == 0)
return (EINVAL);
/*
* TLS 1.0 requires an implicit IV. TLS 1.1 and 1.2
* use explicit IVs.
*/
switch (en->tls_vminor) {
case TLS_MINOR_VER_ZERO:
if (en->iv_len != TLS_CBC_IMPLICIT_IV_LEN)
return (EINVAL);
break;
case TLS_MINOR_VER_ONE:
case TLS_MINOR_VER_TWO:
/* Ignore any supplied IV. */
en->iv_len = 0;
break;
default:
return (EINVAL);
}
break;
case CRYPTO_CHACHA20_POLY1305:
if (en->auth_algorithm != 0 || en->auth_key_len != 0)
return (EINVAL);
if (en->tls_vminor != TLS_MINOR_VER_TWO &&
en->tls_vminor != TLS_MINOR_VER_THREE)
return (EINVAL);
if (en->iv_len != TLS_CHACHA20_IV_LEN)
return (EINVAL);
break;
default:
return (EINVAL);
}
error = ktls_start_kthreads();
if (error != 0)
return (error);
tls = uma_zalloc(ktls_session_zone, M_WAITOK | M_ZERO);
counter_u64_add(ktls_offload_active, 1);
refcount_init(&tls->refcount, 1);
TASK_INIT(&tls->reset_tag_task, 0, ktls_reset_send_tag, tls);
tls->wq_index = ktls_get_cpu(so);
tls->params.cipher_algorithm = en->cipher_algorithm;
tls->params.auth_algorithm = en->auth_algorithm;
tls->params.tls_vmajor = en->tls_vmajor;
tls->params.tls_vminor = en->tls_vminor;
tls->params.flags = en->flags;
tls->params.max_frame_len = min(TLS_MAX_MSG_SIZE_V10_2, ktls_maxlen);
/* Set the header and trailer lengths. */
tls->params.tls_hlen = sizeof(struct tls_record_layer);
switch (en->cipher_algorithm) {
case CRYPTO_AES_NIST_GCM_16:
/*
* TLS 1.2 uses a 4 byte implicit IV with an explicit 8 byte
* nonce. TLS 1.3 uses a 12 byte implicit IV.
*/
if (en->tls_vminor < TLS_MINOR_VER_THREE)
tls->params.tls_hlen += sizeof(uint64_t);
tls->params.tls_tlen = AES_GMAC_HASH_LEN;
tls->params.tls_bs = 1;
break;
case CRYPTO_AES_CBC:
switch (en->auth_algorithm) {
case CRYPTO_SHA1_HMAC:
if (en->tls_vminor == TLS_MINOR_VER_ZERO) {
/* Implicit IV, no nonce. */
tls->sequential_records = true;
tls->next_seqno = be64dec(en->rec_seq);
STAILQ_INIT(&tls->pending_records);
} else {
tls->params.tls_hlen += AES_BLOCK_LEN;
}
tls->params.tls_tlen = AES_BLOCK_LEN +
SHA1_HASH_LEN;
break;
case CRYPTO_SHA2_256_HMAC:
tls->params.tls_hlen += AES_BLOCK_LEN;
tls->params.tls_tlen = AES_BLOCK_LEN +
SHA2_256_HASH_LEN;
break;
case CRYPTO_SHA2_384_HMAC:
tls->params.tls_hlen += AES_BLOCK_LEN;
tls->params.tls_tlen = AES_BLOCK_LEN +
SHA2_384_HASH_LEN;
break;
default:
panic("invalid hmac");
}
tls->params.tls_bs = AES_BLOCK_LEN;
break;
case CRYPTO_CHACHA20_POLY1305:
/*
* Chacha20 uses a 12 byte implicit IV.
*/
tls->params.tls_tlen = POLY1305_HASH_LEN;
tls->params.tls_bs = 1;
break;
default:
panic("invalid cipher");
}
/*
* TLS 1.3 includes optional padding which we do not support,
* and also puts the "real" record type at the end of the
* encrypted data.
*/
if (en->tls_vminor == TLS_MINOR_VER_THREE)
tls->params.tls_tlen += sizeof(uint8_t);
KASSERT(tls->params.tls_hlen <= MBUF_PEXT_HDR_LEN,
("TLS header length too long: %d", tls->params.tls_hlen));
KASSERT(tls->params.tls_tlen <= MBUF_PEXT_TRAIL_LEN,
("TLS trailer length too long: %d", tls->params.tls_tlen));
if (en->auth_key_len != 0) {
tls->params.auth_key_len = en->auth_key_len;
tls->params.auth_key = malloc(en->auth_key_len, M_KTLS,
M_WAITOK);
error = copyin(en->auth_key, tls->params.auth_key,
en->auth_key_len);
if (error)
goto out;
}
tls->params.cipher_key_len = en->cipher_key_len;
tls->params.cipher_key = malloc(en->cipher_key_len, M_KTLS, M_WAITOK);
error = copyin(en->cipher_key, tls->params.cipher_key,
en->cipher_key_len);
if (error)
goto out;
/*
* This holds the implicit portion of the nonce for AEAD
* ciphers and the initial implicit IV for TLS 1.0. The
* explicit portions of the IV are generated in ktls_frame().
*/
if (en->iv_len != 0) {
tls->params.iv_len = en->iv_len;
error = copyin(en->iv, tls->params.iv, en->iv_len);
if (error)
goto out;
/*
* For TLS 1.2 with GCM, generate an 8-byte nonce as a
* counter to generate unique explicit IVs.
*
* Store this counter in the last 8 bytes of the IV
* array so that it is 8-byte aligned.
*/
if (en->cipher_algorithm == CRYPTO_AES_NIST_GCM_16 &&
en->tls_vminor == TLS_MINOR_VER_TWO)
arc4rand(tls->params.iv + 8, sizeof(uint64_t), 0);
}
*tlsp = tls;
return (0);
out:
ktls_cleanup(tls);
return (error);
}
static struct ktls_session *
ktls_clone_session(struct ktls_session *tls)
{
struct ktls_session *tls_new;
tls_new = uma_zalloc(ktls_session_zone, M_WAITOK | M_ZERO);
counter_u64_add(ktls_offload_active, 1);
refcount_init(&tls_new->refcount, 1);
TASK_INIT(&tls_new->reset_tag_task, 0, ktls_reset_send_tag, tls_new);
/* Copy fields from existing session. */
tls_new->params = tls->params;
tls_new->wq_index = tls->wq_index;
/* Deep copy keys. */
if (tls_new->params.auth_key != NULL) {
tls_new->params.auth_key = malloc(tls->params.auth_key_len,
M_KTLS, M_WAITOK);
memcpy(tls_new->params.auth_key, tls->params.auth_key,
tls->params.auth_key_len);
}
tls_new->params.cipher_key = malloc(tls->params.cipher_key_len, M_KTLS,
M_WAITOK);
memcpy(tls_new->params.cipher_key, tls->params.cipher_key,
tls->params.cipher_key_len);
return (tls_new);
}
#endif
static void
ktls_cleanup(struct ktls_session *tls)
{
counter_u64_add(ktls_offload_active, -1);
switch (tls->mode) {
case TCP_TLS_MODE_SW:
switch (tls->params.cipher_algorithm) {
case CRYPTO_AES_CBC:
counter_u64_add(ktls_sw_cbc, -1);
break;
case CRYPTO_AES_NIST_GCM_16:
counter_u64_add(ktls_sw_gcm, -1);
break;
case CRYPTO_CHACHA20_POLY1305:
counter_u64_add(ktls_sw_chacha20, -1);
break;
}
break;
case TCP_TLS_MODE_IFNET:
switch (tls->params.cipher_algorithm) {
case CRYPTO_AES_CBC:
counter_u64_add(ktls_ifnet_cbc, -1);
break;
case CRYPTO_AES_NIST_GCM_16:
counter_u64_add(ktls_ifnet_gcm, -1);
break;
case CRYPTO_CHACHA20_POLY1305:
counter_u64_add(ktls_ifnet_chacha20, -1);
break;
}
if (tls->snd_tag != NULL)
m_snd_tag_rele(tls->snd_tag);
break;
#ifdef TCP_OFFLOAD
case TCP_TLS_MODE_TOE:
switch (tls->params.cipher_algorithm) {
case CRYPTO_AES_CBC:
counter_u64_add(ktls_toe_cbc, -1);
break;
case CRYPTO_AES_NIST_GCM_16:
counter_u64_add(ktls_toe_gcm, -1);
break;
case CRYPTO_CHACHA20_POLY1305:
counter_u64_add(ktls_toe_chacha20, -1);
break;
}
break;
#endif
}
if (tls->ocf_session != NULL)
ktls_ocf_free(tls);
if (tls->params.auth_key != NULL) {
zfree(tls->params.auth_key, M_KTLS);
tls->params.auth_key = NULL;
tls->params.auth_key_len = 0;
}
if (tls->params.cipher_key != NULL) {
zfree(tls->params.cipher_key, M_KTLS);
tls->params.cipher_key = NULL;
tls->params.cipher_key_len = 0;
}
explicit_bzero(tls->params.iv, sizeof(tls->params.iv));
}
#if defined(INET) || defined(INET6)
#ifdef TCP_OFFLOAD
static int
ktls_try_toe(struct socket *so, struct ktls_session *tls, int direction)
{
struct inpcb *inp;
struct tcpcb *tp;
int error;
inp = so->so_pcb;
INP_WLOCK(inp);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
INP_WUNLOCK(inp);
return (ECONNRESET);
}
if (inp->inp_socket == NULL) {
INP_WUNLOCK(inp);
return (ECONNRESET);
}
tp = intotcpcb(inp);
if (!(tp->t_flags & TF_TOE)) {
INP_WUNLOCK(inp);
return (EOPNOTSUPP);
}
error = tcp_offload_alloc_tls_session(tp, tls, direction);
INP_WUNLOCK(inp);
if (error == 0) {
tls->mode = TCP_TLS_MODE_TOE;
switch (tls->params.cipher_algorithm) {
case CRYPTO_AES_CBC:
counter_u64_add(ktls_toe_cbc, 1);
break;
case CRYPTO_AES_NIST_GCM_16:
counter_u64_add(ktls_toe_gcm, 1);
break;
case CRYPTO_CHACHA20_POLY1305:
counter_u64_add(ktls_toe_chacha20, 1);
break;
}
}
return (error);
}
#endif
/*
* Common code used when first enabling ifnet TLS on a connection or
* when allocating a new ifnet TLS session due to a routing change.
* This function allocates a new TLS send tag on whatever interface
* the connection is currently routed over.
*/
static int
ktls_alloc_snd_tag(struct inpcb *inp, struct ktls_session *tls, bool force,
struct m_snd_tag **mstp)
{
union if_snd_tag_alloc_params params;
struct ifnet *ifp;
struct nhop_object *nh;
struct tcpcb *tp;
int error;
INP_RLOCK(inp);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
INP_RUNLOCK(inp);
return (ECONNRESET);
}
if (inp->inp_socket == NULL) {
INP_RUNLOCK(inp);
return (ECONNRESET);
}
tp = intotcpcb(inp);
/*
* Check administrative controls on ifnet TLS to determine if
* ifnet TLS should be denied.
*
* - Always permit 'force' requests.
* - ktls_ifnet_permitted == 0: always deny.
*/
if (!force && ktls_ifnet_permitted == 0) {
INP_RUNLOCK(inp);
return (ENXIO);
}
/*
* XXX: Use the cached route in the inpcb to find the
* interface. This should perhaps instead use
* rtalloc1_fib(dst, 0, 0, fibnum). Since KTLS is only
* enabled after a connection has completed key negotiation in
* userland, the cached route will be present in practice.
*/
nh = inp->inp_route.ro_nh;
if (nh == NULL) {
INP_RUNLOCK(inp);
return (ENXIO);
}
ifp = nh->nh_ifp;
if_ref(ifp);
/*
* Allocate a TLS + ratelimit tag if the connection has an
* existing pacing rate.
*/
if (tp->t_pacing_rate != -1 &&
(ifp->if_capenable & IFCAP_TXTLS_RTLMT) != 0) {
params.hdr.type = IF_SND_TAG_TYPE_TLS_RATE_LIMIT;
params.tls_rate_limit.inp = inp;
params.tls_rate_limit.tls = tls;
params.tls_rate_limit.max_rate = tp->t_pacing_rate;
} else {
params.hdr.type = IF_SND_TAG_TYPE_TLS;
params.tls.inp = inp;
params.tls.tls = tls;
}
params.hdr.flowid = inp->inp_flowid;
params.hdr.flowtype = inp->inp_flowtype;
params.hdr.numa_domain = inp->inp_numa_domain;
INP_RUNLOCK(inp);
if ((ifp->if_capenable & IFCAP_MEXTPG) == 0) {
error = EOPNOTSUPP;
goto out;
}
if (inp->inp_vflag & INP_IPV6) {
if ((ifp->if_capenable & IFCAP_TXTLS6) == 0) {
error = EOPNOTSUPP;
goto out;
}
} else {
if ((ifp->if_capenable & IFCAP_TXTLS4) == 0) {
error = EOPNOTSUPP;
goto out;
}
}
error = m_snd_tag_alloc(ifp, &params, mstp);
out:
if_rele(ifp);
return (error);
}
static int
ktls_try_ifnet(struct socket *so, struct ktls_session *tls, bool force)
{
struct m_snd_tag *mst;
int error;
error = ktls_alloc_snd_tag(so->so_pcb, tls, force, &mst);
if (error == 0) {
tls->mode = TCP_TLS_MODE_IFNET;
tls->snd_tag = mst;
switch (tls->params.cipher_algorithm) {
case CRYPTO_AES_CBC:
counter_u64_add(ktls_ifnet_cbc, 1);
break;
case CRYPTO_AES_NIST_GCM_16:
counter_u64_add(ktls_ifnet_gcm, 1);
break;
case CRYPTO_CHACHA20_POLY1305:
counter_u64_add(ktls_ifnet_chacha20, 1);
break;
}
}
return (error);
}
static void
ktls_use_sw(struct ktls_session *tls)
{
tls->mode = TCP_TLS_MODE_SW;
switch (tls->params.cipher_algorithm) {
case CRYPTO_AES_CBC:
counter_u64_add(ktls_sw_cbc, 1);
break;
case CRYPTO_AES_NIST_GCM_16:
counter_u64_add(ktls_sw_gcm, 1);
break;
case CRYPTO_CHACHA20_POLY1305:
counter_u64_add(ktls_sw_chacha20, 1);
break;
}
}
static int
ktls_try_sw(struct socket *so, struct ktls_session *tls, int direction)
{
int error;
error = ktls_ocf_try(so, tls, direction);
if (error)
return (error);
ktls_use_sw(tls);
return (0);
}
/*
* KTLS RX stores data in the socket buffer as a list of TLS records,
* where each record is stored as a control message containg the TLS
* header followed by data mbufs containing the decrypted data. This
* is different from KTLS TX which always uses an mb_ext_pgs mbuf for
* both encrypted and decrypted data. TLS records decrypted by a NIC
* should be queued to the socket buffer as records, but encrypted
* data which needs to be decrypted by software arrives as a stream of
* regular mbufs which need to be converted. In addition, there may
* already be pending encrypted data in the socket buffer when KTLS RX
* is enabled.
*
* To manage not-yet-decrypted data for KTLS RX, the following scheme
* is used:
*
* - A single chain of NOTREADY mbufs is hung off of sb_mtls.
*
* - ktls_check_rx checks this chain of mbufs reading the TLS header
* from the first mbuf. Once all of the data for that TLS record is
* queued, the socket is queued to a worker thread.
*
* - The worker thread calls ktls_decrypt to decrypt TLS records in
* the TLS chain. Each TLS record is detached from the TLS chain,
* decrypted, and inserted into the regular socket buffer chain as
* record starting with a control message holding the TLS header and
* a chain of mbufs holding the encrypted data.
*/
static void
sb_mark_notready(struct sockbuf *sb)
{
struct mbuf *m;
m = sb->sb_mb;
sb->sb_mtls = m;
sb->sb_mb = NULL;
sb->sb_mbtail = NULL;
sb->sb_lastrecord = NULL;
for (; m != NULL; m = m->m_next) {
KASSERT(m->m_nextpkt == NULL, ("%s: m_nextpkt != NULL",
__func__));
KASSERT((m->m_flags & M_NOTAVAIL) == 0, ("%s: mbuf not avail",
__func__));
KASSERT(sb->sb_acc >= m->m_len, ("%s: sb_acc < m->m_len",
__func__));
m->m_flags |= M_NOTREADY;
sb->sb_acc -= m->m_len;
sb->sb_tlscc += m->m_len;
sb->sb_mtlstail = m;
}
KASSERT(sb->sb_acc == 0 && sb->sb_tlscc == sb->sb_ccc,
("%s: acc %u tlscc %u ccc %u", __func__, sb->sb_acc, sb->sb_tlscc,
sb->sb_ccc));
}
/*
* Return information about the pending TLS data in a socket
* buffer. On return, 'seqno' is set to the sequence number
* of the next TLS record to be received, 'resid' is set to
* the amount of bytes still needed for the last pending
* record. The function returns 'false' if the last pending
* record contains a partial TLS header. In that case, 'resid'
* is the number of bytes needed to complete the TLS header.
*/
bool
ktls_pending_rx_info(struct sockbuf *sb, uint64_t *seqnop, size_t *residp)
{
struct tls_record_layer hdr;
struct mbuf *m;
uint64_t seqno;
size_t resid;
u_int offset, record_len;
SOCKBUF_LOCK_ASSERT(sb);
MPASS(sb->sb_flags & SB_TLS_RX);
seqno = sb->sb_tls_seqno;
resid = sb->sb_tlscc;
m = sb->sb_mtls;
offset = 0;
if (resid == 0) {
*seqnop = seqno;
*residp = 0;
return (true);
}
for (;;) {
seqno++;
if (resid < sizeof(hdr)) {
*seqnop = seqno;
*residp = sizeof(hdr) - resid;
return (false);
}
m_copydata(m, offset, sizeof(hdr), (void *)&hdr);
record_len = sizeof(hdr) + ntohs(hdr.tls_length);
if (resid <= record_len) {
*seqnop = seqno;
*residp = record_len - resid;
return (true);
}
resid -= record_len;
while (record_len != 0) {
if (m->m_len - offset > record_len) {
offset += record_len;
break;
}
record_len -= (m->m_len - offset);
offset = 0;
m = m->m_next;
}
}
}
int
ktls_enable_rx(struct socket *so, struct tls_enable *en)
{
struct ktls_session *tls;
int error;
if (!ktls_offload_enable)
return (ENOTSUP);
if (SOLISTENING(so))
return (EINVAL);
counter_u64_add(ktls_offload_enable_calls, 1);
/*
* This should always be true since only the TCP socket option
* invokes this function.
*/
if (so->so_proto->pr_protocol != IPPROTO_TCP)
return (EINVAL);
/*
* XXX: Don't overwrite existing sessions. We should permit
* this to support rekeying in the future.
*/
if (so->so_rcv.sb_tls_info != NULL)
return (EALREADY);
if (en->cipher_algorithm == CRYPTO_AES_CBC && !ktls_cbc_enable)
return (ENOTSUP);
error = ktls_create_session(so, en, &tls);
if (error)
return (error);
error = ktls_ocf_try(so, tls, KTLS_RX);
if (error) {
ktls_cleanup(tls);
return (error);
}
/* Mark the socket as using TLS offload. */
SOCKBUF_LOCK(&so->so_rcv);
so->so_rcv.sb_tls_seqno = be64dec(en->rec_seq);
so->so_rcv.sb_tls_info = tls;
so->so_rcv.sb_flags |= SB_TLS_RX;
/* Mark existing data as not ready until it can be decrypted. */
sb_mark_notready(&so->so_rcv);
ktls_check_rx(&so->so_rcv);
SOCKBUF_UNLOCK(&so->so_rcv);
#ifdef TCP_OFFLOAD
error = ktls_try_toe(so, tls, KTLS_RX);
if (error)
#endif
ktls_use_sw(tls);
counter_u64_add(ktls_offload_total, 1);
return (0);
}
int
ktls_enable_tx(struct socket *so, struct tls_enable *en)
{
struct ktls_session *tls;
struct inpcb *inp;
int error;
if (!ktls_offload_enable)
return (ENOTSUP);
if (SOLISTENING(so))
return (EINVAL);
counter_u64_add(ktls_offload_enable_calls, 1);
/*
* This should always be true since only the TCP socket option
* invokes this function.
*/
if (so->so_proto->pr_protocol != IPPROTO_TCP)
return (EINVAL);
/*
* XXX: Don't overwrite existing sessions. We should permit
* this to support rekeying in the future.
*/
if (so->so_snd.sb_tls_info != NULL)
return (EALREADY);
if (en->cipher_algorithm == CRYPTO_AES_CBC && !ktls_cbc_enable)
return (ENOTSUP);
/* TLS requires ext pgs */
if (mb_use_ext_pgs == 0)
return (ENXIO);
error = ktls_create_session(so, en, &tls);
if (error)
return (error);
/* Prefer TOE -> ifnet TLS -> software TLS. */
#ifdef TCP_OFFLOAD
error = ktls_try_toe(so, tls, KTLS_TX);
if (error)
#endif
error = ktls_try_ifnet(so, tls, false);
if (error)
error = ktls_try_sw(so, tls, KTLS_TX);
if (error) {
ktls_cleanup(tls);
return (error);
}
error = SOCK_IO_SEND_LOCK(so, SBL_WAIT);
if (error) {
ktls_cleanup(tls);
return (error);
}
/*
* Write lock the INP when setting sb_tls_info so that
* routines in tcp_ratelimit.c can read sb_tls_info while
* holding the INP lock.
*/
inp = so->so_pcb;
INP_WLOCK(inp);
SOCKBUF_LOCK(&so->so_snd);
so->so_snd.sb_tls_seqno = be64dec(en->rec_seq);
so->so_snd.sb_tls_info = tls;
if (tls->mode != TCP_TLS_MODE_SW)
so->so_snd.sb_flags |= SB_TLS_IFNET;
SOCKBUF_UNLOCK(&so->so_snd);
INP_WUNLOCK(inp);
SOCK_IO_SEND_UNLOCK(so);
counter_u64_add(ktls_offload_total, 1);
return (0);
}
int
ktls_get_rx_mode(struct socket *so, int *modep)
{
struct ktls_session *tls;
struct inpcb *inp __diagused;
if (SOLISTENING(so))
return (EINVAL);
inp = so->so_pcb;
INP_WLOCK_ASSERT(inp);
SOCK_RECVBUF_LOCK(so);
tls = so->so_rcv.sb_tls_info;
if (tls == NULL)
*modep = TCP_TLS_MODE_NONE;
else
*modep = tls->mode;
SOCK_RECVBUF_UNLOCK(so);
return (0);
}
/*
* ktls_get_rx_sequence - get the next TCP- and TLS- sequence number.
*
* This function gets information about the next TCP- and TLS-
* sequence number to be processed by the TLS receive worker
* thread. The information is extracted from the given "inpcb"
* structure. The values are stored in host endian format at the two
* given output pointer locations. The TCP sequence number points to
* the beginning of the TLS header.
*
* This function returns zero on success, else a non-zero error code
* is returned.
*/
int
ktls_get_rx_sequence(struct inpcb *inp, uint32_t *tcpseq, uint64_t *tlsseq)
{
struct socket *so;
struct tcpcb *tp;
INP_RLOCK(inp);
so = inp->inp_socket;
if (__predict_false(so == NULL)) {
INP_RUNLOCK(inp);
return (EINVAL);
}
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
INP_RUNLOCK(inp);
return (ECONNRESET);
}
tp = intotcpcb(inp);
MPASS(tp != NULL);
SOCKBUF_LOCK(&so->so_rcv);
*tcpseq = tp->rcv_nxt - so->so_rcv.sb_tlscc;
*tlsseq = so->so_rcv.sb_tls_seqno;
SOCKBUF_UNLOCK(&so->so_rcv);
INP_RUNLOCK(inp);
return (0);
}
int
ktls_get_tx_mode(struct socket *so, int *modep)
{
struct ktls_session *tls;
struct inpcb *inp __diagused;
if (SOLISTENING(so))
return (EINVAL);
inp = so->so_pcb;
INP_WLOCK_ASSERT(inp);
SOCK_SENDBUF_LOCK(so);
tls = so->so_snd.sb_tls_info;
if (tls == NULL)
*modep = TCP_TLS_MODE_NONE;
else
*modep = tls->mode;
SOCK_SENDBUF_UNLOCK(so);
return (0);
}
/*
* Switch between SW and ifnet TLS sessions as requested.
*/
int
ktls_set_tx_mode(struct socket *so, int mode)
{
struct ktls_session *tls, *tls_new;
struct inpcb *inp;
int error;
if (SOLISTENING(so))
return (EINVAL);
switch (mode) {
case TCP_TLS_MODE_SW:
case TCP_TLS_MODE_IFNET:
break;
default:
return (EINVAL);
}
inp = so->so_pcb;
INP_WLOCK_ASSERT(inp);
SOCKBUF_LOCK(&so->so_snd);
tls = so->so_snd.sb_tls_info;
if (tls == NULL) {
SOCKBUF_UNLOCK(&so->so_snd);
return (0);
}
if (tls->mode == mode) {
SOCKBUF_UNLOCK(&so->so_snd);
return (0);
}
tls = ktls_hold(tls);
SOCKBUF_UNLOCK(&so->so_snd);
INP_WUNLOCK(inp);
tls_new = ktls_clone_session(tls);
if (mode == TCP_TLS_MODE_IFNET)
error = ktls_try_ifnet(so, tls_new, true);
else
error = ktls_try_sw(so, tls_new, KTLS_TX);
if (error) {
counter_u64_add(ktls_switch_failed, 1);
ktls_free(tls_new);
ktls_free(tls);
INP_WLOCK(inp);
return (error);
}
error = SOCK_IO_SEND_LOCK(so, SBL_WAIT);
if (error) {
counter_u64_add(ktls_switch_failed, 1);
ktls_free(tls_new);
ktls_free(tls);
INP_WLOCK(inp);
return (error);
}
/*
* If we raced with another session change, keep the existing
* session.
*/
if (tls != so->so_snd.sb_tls_info) {
counter_u64_add(ktls_switch_failed, 1);
SOCK_IO_SEND_UNLOCK(so);
ktls_free(tls_new);
ktls_free(tls);
INP_WLOCK(inp);
return (EBUSY);
}
INP_WLOCK(inp);
SOCKBUF_LOCK(&so->so_snd);
so->so_snd.sb_tls_info = tls_new;
if (tls_new->mode != TCP_TLS_MODE_SW)
so->so_snd.sb_flags |= SB_TLS_IFNET;
SOCKBUF_UNLOCK(&so->so_snd);
SOCK_IO_SEND_UNLOCK(so);
/*
* Drop two references on 'tls'. The first is for the
* ktls_hold() above. The second drops the reference from the
* socket buffer.
*/
KASSERT(tls->refcount >= 2, ("too few references on old session"));
ktls_free(tls);
ktls_free(tls);
if (mode == TCP_TLS_MODE_IFNET)
counter_u64_add(ktls_switch_to_ifnet, 1);
else
counter_u64_add(ktls_switch_to_sw, 1);
return (0);
}
/*
* Try to allocate a new TLS send tag. This task is scheduled when
* ip_output detects a route change while trying to transmit a packet
* holding a TLS record. If a new tag is allocated, replace the tag
* in the TLS session. Subsequent packets on the connection will use
* the new tag. If a new tag cannot be allocated, drop the
* connection.
*/
static void
ktls_reset_send_tag(void *context, int pending)
{
struct epoch_tracker et;
struct ktls_session *tls;
struct m_snd_tag *old, *new;
struct inpcb *inp;
struct tcpcb *tp;
int error;
MPASS(pending == 1);
tls = context;
inp = tls->inp;
/*
* Free the old tag first before allocating a new one.
* ip[6]_output_send() will treat a NULL send tag the same as
* an ifp mismatch and drop packets until a new tag is
* allocated.
*
* Write-lock the INP when changing tls->snd_tag since
* ip[6]_output_send() holds a read-lock when reading the
* pointer.
*/
INP_WLOCK(inp);
old = tls->snd_tag;
tls->snd_tag = NULL;
INP_WUNLOCK(inp);
if (old != NULL)
m_snd_tag_rele(old);
error = ktls_alloc_snd_tag(inp, tls, true, &new);
if (error == 0) {
INP_WLOCK(inp);
tls->snd_tag = new;
mtx_pool_lock(mtxpool_sleep, tls);
tls->reset_pending = false;
mtx_pool_unlock(mtxpool_sleep, tls);
if (!in_pcbrele_wlocked(inp))
INP_WUNLOCK(inp);
counter_u64_add(ktls_ifnet_reset, 1);
/*
* XXX: Should we kick tcp_output explicitly now that
* the send tag is fixed or just rely on timers?
*/
} else {
NET_EPOCH_ENTER(et);
INP_WLOCK(inp);
if (!in_pcbrele_wlocked(inp)) {
if (!(inp->inp_flags & INP_TIMEWAIT) &&
!(inp->inp_flags & INP_DROPPED)) {
tp = intotcpcb(inp);
CURVNET_SET(tp->t_vnet);
tp = tcp_drop(tp, ECONNABORTED);
CURVNET_RESTORE();
if (tp != NULL)
INP_WUNLOCK(inp);
counter_u64_add(ktls_ifnet_reset_dropped, 1);
} else
INP_WUNLOCK(inp);
}
NET_EPOCH_EXIT(et);
counter_u64_add(ktls_ifnet_reset_failed, 1);
/*
* Leave reset_pending true to avoid future tasks while
* the socket goes away.
*/
}
ktls_free(tls);
}
int
ktls_output_eagain(struct inpcb *inp, struct ktls_session *tls)
{
if (inp == NULL)
return (ENOBUFS);
INP_LOCK_ASSERT(inp);
/*
* See if we should schedule a task to update the send tag for
* this session.
*/
mtx_pool_lock(mtxpool_sleep, tls);
if (!tls->reset_pending) {
(void) ktls_hold(tls);
in_pcbref(inp);
tls->inp = inp;
tls->reset_pending = true;
taskqueue_enqueue(taskqueue_thread, &tls->reset_tag_task);
}
mtx_pool_unlock(mtxpool_sleep, tls);
return (ENOBUFS);
}
#ifdef RATELIMIT
int
ktls_modify_txrtlmt(struct ktls_session *tls, uint64_t max_pacing_rate)
{
union if_snd_tag_modify_params params = {
.rate_limit.max_rate = max_pacing_rate,
.rate_limit.flags = M_NOWAIT,
};
struct m_snd_tag *mst;
/* Can't get to the inp, but it should be locked. */
/* INP_LOCK_ASSERT(inp); */
MPASS(tls->mode == TCP_TLS_MODE_IFNET);
if (tls->snd_tag == NULL) {
/*
* Resetting send tag, ignore this change. The
* pending reset may or may not see this updated rate
* in the tcpcb. If it doesn't, we will just lose
* this rate change.
*/
return (0);
}
MPASS(tls->snd_tag != NULL);
MPASS(tls->snd_tag->sw->type == IF_SND_TAG_TYPE_TLS_RATE_LIMIT);
mst = tls->snd_tag;
return (mst->sw->snd_tag_modify(mst, &params));
}
#endif
#endif
void
ktls_destroy(struct ktls_session *tls)
{
if (tls->sequential_records) {
struct mbuf *m, *n;
int page_count;
STAILQ_FOREACH_SAFE(m, &tls->pending_records, m_epg_stailq, n) {
page_count = m->m_epg_enc_cnt;
while (page_count > 0) {
KASSERT(page_count >= m->m_epg_nrdy,
("%s: too few pages", __func__));
page_count -= m->m_epg_nrdy;
m = m_free(m);
}
}
}
ktls_cleanup(tls);
uma_zfree(ktls_session_zone, tls);
}
void
ktls_seq(struct sockbuf *sb, struct mbuf *m)
{
for (; m != NULL; m = m->m_next) {
KASSERT((m->m_flags & M_EXTPG) != 0,
("ktls_seq: mapped mbuf %p", m));
m->m_epg_seqno = sb->sb_tls_seqno;
sb->sb_tls_seqno++;
}
}
/*
* Add TLS framing (headers and trailers) to a chain of mbufs. Each
* mbuf in the chain must be an unmapped mbuf. The payload of the
* mbuf must be populated with the payload of each TLS record.
*
* The record_type argument specifies the TLS record type used when
* populating the TLS header.
*
* The enq_count argument on return is set to the number of pages of
* payload data for this entire chain that need to be encrypted via SW
* encryption. The returned value should be passed to ktls_enqueue
* when scheduling encryption of this chain of mbufs. To handle the
* special case of empty fragments for TLS 1.0 sessions, an empty
* fragment counts as one page.
*/
void
ktls_frame(struct mbuf *top, struct ktls_session *tls, int *enq_cnt,
uint8_t record_type)
{
struct tls_record_layer *tlshdr;
struct mbuf *m;
uint64_t *noncep;
uint16_t tls_len;
int maxlen __diagused;
maxlen = tls->params.max_frame_len;
*enq_cnt = 0;
for (m = top; m != NULL; m = m->m_next) {
/*
* All mbufs in the chain should be TLS records whose
* payload does not exceed the maximum frame length.
*
* Empty TLS 1.0 records are permitted when using CBC.
*/
KASSERT(m->m_len <= maxlen && m->m_len >= 0 &&
(m->m_len > 0 || ktls_permit_empty_frames(tls)),
("ktls_frame: m %p len %d", m, m->m_len));
/*
* TLS frames require unmapped mbufs to store session
* info.
*/
KASSERT((m->m_flags & M_EXTPG) != 0,
("ktls_frame: mapped mbuf %p (top = %p)", m, top));
tls_len = m->m_len;
/* Save a reference to the session. */
m->m_epg_tls = ktls_hold(tls);
m->m_epg_hdrlen = tls->params.tls_hlen;
m->m_epg_trllen = tls->params.tls_tlen;
if (tls->params.cipher_algorithm == CRYPTO_AES_CBC) {
int bs, delta;
/*
* AES-CBC pads messages to a multiple of the
* block size. Note that the padding is
* applied after the digest and the encryption
* is done on the "plaintext || mac || padding".
* At least one byte of padding is always
* present.
*
* Compute the final trailer length assuming
* at most one block of padding.
* tls->params.tls_tlen is the maximum
* possible trailer length (padding + digest).
* delta holds the number of excess padding
* bytes if the maximum were used. Those
* extra bytes are removed.
*/
bs = tls->params.tls_bs;
delta = (tls_len + tls->params.tls_tlen) & (bs - 1);
m->m_epg_trllen -= delta;
}
m->m_len += m->m_epg_hdrlen + m->m_epg_trllen;
/* Populate the TLS header. */
tlshdr = (void *)m->m_epg_hdr;
tlshdr->tls_vmajor = tls->params.tls_vmajor;
/*
* TLS 1.3 masquarades as TLS 1.2 with a record type
* of TLS_RLTYPE_APP.
*/
if (tls->params.tls_vminor == TLS_MINOR_VER_THREE &&
tls->params.tls_vmajor == TLS_MAJOR_VER_ONE) {
tlshdr->tls_vminor = TLS_MINOR_VER_TWO;
tlshdr->tls_type = TLS_RLTYPE_APP;
/* save the real record type for later */
m->m_epg_record_type = record_type;
m->m_epg_trail[0] = record_type;
} else {
tlshdr->tls_vminor = tls->params.tls_vminor;
tlshdr->tls_type = record_type;
}
tlshdr->tls_length = htons(m->m_len - sizeof(*tlshdr));
/*
* Store nonces / explicit IVs after the end of the
* TLS header.
*
* For GCM with TLS 1.2, an 8 byte nonce is copied
* from the end of the IV. The nonce is then
* incremented for use by the next record.
*
* For CBC, a random nonce is inserted for TLS 1.1+.
*/
if (tls->params.cipher_algorithm == CRYPTO_AES_NIST_GCM_16 &&
tls->params.tls_vminor == TLS_MINOR_VER_TWO) {
noncep = (uint64_t *)(tls->params.iv + 8);
be64enc(tlshdr + 1, *noncep);
(*noncep)++;
} else if (tls->params.cipher_algorithm == CRYPTO_AES_CBC &&
tls->params.tls_vminor >= TLS_MINOR_VER_ONE)
arc4rand(tlshdr + 1, AES_BLOCK_LEN, 0);
/*
* When using SW encryption, mark the mbuf not ready.
* It will be marked ready via sbready() after the
* record has been encrypted.
*
* When using ifnet TLS, unencrypted TLS records are
* sent down the stack to the NIC.
*/
if (tls->mode == TCP_TLS_MODE_SW) {
m->m_flags |= M_NOTREADY;
if (__predict_false(tls_len == 0)) {
/* TLS 1.0 empty fragment. */
m->m_epg_nrdy = 1;
} else
m->m_epg_nrdy = m->m_epg_npgs;
*enq_cnt += m->m_epg_nrdy;
}
}
}
bool
ktls_permit_empty_frames(struct ktls_session *tls)
{
return (tls->params.cipher_algorithm == CRYPTO_AES_CBC &&
tls->params.tls_vminor == TLS_MINOR_VER_ZERO);
}
void
ktls_check_rx(struct sockbuf *sb)
{
struct tls_record_layer hdr;
struct ktls_wq *wq;
struct socket *so;
bool running;
SOCKBUF_LOCK_ASSERT(sb);
KASSERT(sb->sb_flags & SB_TLS_RX, ("%s: sockbuf %p isn't TLS RX",
__func__, sb));
so = __containerof(sb, struct socket, so_rcv);
if (sb->sb_flags & SB_TLS_RX_RUNNING)
return;
/* Is there enough queued for a TLS header? */
if (sb->sb_tlscc < sizeof(hdr)) {
if ((sb->sb_state & SBS_CANTRCVMORE) != 0 && sb->sb_tlscc != 0)
so->so_error = EMSGSIZE;
return;
}
m_copydata(sb->sb_mtls, 0, sizeof(hdr), (void *)&hdr);
/* Is the entire record queued? */
if (sb->sb_tlscc < sizeof(hdr) + ntohs(hdr.tls_length)) {
if ((sb->sb_state & SBS_CANTRCVMORE) != 0)
so->so_error = EMSGSIZE;
return;
}
sb->sb_flags |= SB_TLS_RX_RUNNING;
soref(so);
wq = &ktls_wq[so->so_rcv.sb_tls_info->wq_index];
mtx_lock(&wq->mtx);
STAILQ_INSERT_TAIL(&wq->so_head, so, so_ktls_rx_list);
running = wq->running;
mtx_unlock(&wq->mtx);
if (!running)
wakeup(wq);
counter_u64_add(ktls_cnt_rx_queued, 1);
}
static struct mbuf *
ktls_detach_record(struct sockbuf *sb, int len)
{
struct mbuf *m, *n, *top;
int remain;
SOCKBUF_LOCK_ASSERT(sb);
MPASS(len <= sb->sb_tlscc);
/*
* If TLS chain is the exact size of the record,
* just grab the whole record.
*/
top = sb->sb_mtls;
if (sb->sb_tlscc == len) {
sb->sb_mtls = NULL;
sb->sb_mtlstail = NULL;
goto out;
}
/*
* While it would be nice to use m_split() here, we need
* to know exactly what m_split() allocates to update the
* accounting, so do it inline instead.
*/
remain = len;
for (m = top; remain > m->m_len; m = m->m_next)
remain -= m->m_len;
/* Easy case: don't have to split 'm'. */
if (remain == m->m_len) {
sb->sb_mtls = m->m_next;
if (sb->sb_mtls == NULL)
sb->sb_mtlstail = NULL;
m->m_next = NULL;
goto out;
}
/*
* Need to allocate an mbuf to hold the remainder of 'm'. Try
* with M_NOWAIT first.
*/
n = m_get(M_NOWAIT, MT_DATA);
if (n == NULL) {
/*
* Use M_WAITOK with socket buffer unlocked. If
* 'sb_mtls' changes while the lock is dropped, return
* NULL to force the caller to retry.
*/
SOCKBUF_UNLOCK(sb);
n = m_get(M_WAITOK, MT_DATA);
SOCKBUF_LOCK(sb);
if (sb->sb_mtls != top) {
m_free(n);
return (NULL);
}
}
n->m_flags |= M_NOTREADY;
/* Store remainder in 'n'. */
n->m_len = m->m_len - remain;
if (m->m_flags & M_EXT) {
n->m_data = m->m_data + remain;
mb_dupcl(n, m);
} else {
bcopy(mtod(m, caddr_t) + remain, mtod(n, caddr_t), n->m_len);
}
/* Trim 'm' and update accounting. */
m->m_len -= n->m_len;
sb->sb_tlscc -= n->m_len;
sb->sb_ccc -= n->m_len;
/* Account for 'n'. */
sballoc_ktls_rx(sb, n);
/* Insert 'n' into the TLS chain. */
sb->sb_mtls = n;
n->m_next = m->m_next;
if (sb->sb_mtlstail == m)
sb->sb_mtlstail = n;
/* Detach the record from the TLS chain. */
m->m_next = NULL;
out:
MPASS(m_length(top, NULL) == len);
for (m = top; m != NULL; m = m->m_next)
sbfree_ktls_rx(sb, m);
sb->sb_tlsdcc = len;
sb->sb_ccc += len;
SBCHECK(sb);
return (top);
}
/*
* Determine the length of the trailing zero padding and find the real
* record type in the byte before the padding.
*
* Walking the mbuf chain backwards is clumsy, so another option would
* be to scan forwards remembering the last non-zero byte before the
* trailer. However, it would be expensive to scan the entire record.
* Instead, find the last non-zero byte of each mbuf in the chain
* keeping track of the relative offset of that nonzero byte.
*
* trail_len is the size of the MAC/tag on input and is set to the
* size of the full trailer including padding and the record type on
* return.
*/
static int
tls13_find_record_type(struct ktls_session *tls, struct mbuf *m, int tls_len,
int *trailer_len, uint8_t *record_typep)
{
char *cp;
u_int digest_start, last_offset, m_len, offset;
uint8_t record_type;
digest_start = tls_len - *trailer_len;
last_offset = 0;
offset = 0;
for (; m != NULL && offset < digest_start;
offset += m->m_len, m = m->m_next) {
/* Don't look for padding in the tag. */
m_len = min(digest_start - offset, m->m_len);
cp = mtod(m, char *);
/* Find last non-zero byte in this mbuf. */
while (m_len > 0 && cp[m_len - 1] == 0)
m_len--;
if (m_len > 0) {
record_type = cp[m_len - 1];
last_offset = offset + m_len;
}
}
if (last_offset < tls->params.tls_hlen)
return (EBADMSG);
*record_typep = record_type;
*trailer_len = tls_len - last_offset + 1;
return (0);
}
static void
ktls_decrypt(struct socket *so)
{
char tls_header[MBUF_PEXT_HDR_LEN];
struct ktls_session *tls;
struct sockbuf *sb;
struct tls_record_layer *hdr;
struct tls_get_record tgr;
struct mbuf *control, *data, *m;
uint64_t seqno;
int error, remain, tls_len, trail_len;
bool tls13;
uint8_t vminor, record_type;
hdr = (struct tls_record_layer *)tls_header;
sb = &so->so_rcv;
SOCKBUF_LOCK(sb);
KASSERT(sb->sb_flags & SB_TLS_RX_RUNNING,
("%s: socket %p not running", __func__, so));
tls = sb->sb_tls_info;
MPASS(tls != NULL);
tls13 = (tls->params.tls_vminor == TLS_MINOR_VER_THREE);
if (tls13)
vminor = TLS_MINOR_VER_TWO;
else
vminor = tls->params.tls_vminor;
for (;;) {
/* Is there enough queued for a TLS header? */
if (sb->sb_tlscc < tls->params.tls_hlen)
break;
m_copydata(sb->sb_mtls, 0, tls->params.tls_hlen, tls_header);
tls_len = sizeof(*hdr) + ntohs(hdr->tls_length);
if (hdr->tls_vmajor != tls->params.tls_vmajor ||
hdr->tls_vminor != vminor)
error = EINVAL;
else if (tls13 && hdr->tls_type != TLS_RLTYPE_APP)
error = EINVAL;
else if (tls_len < tls->params.tls_hlen || tls_len >
tls->params.tls_hlen + TLS_MAX_MSG_SIZE_V10_2 +
tls->params.tls_tlen)
error = EMSGSIZE;
else
error = 0;
if (__predict_false(error != 0)) {
/*
* We have a corrupted record and are likely
* out of sync. The connection isn't
* recoverable at this point, so abort it.
*/
SOCKBUF_UNLOCK(sb);
counter_u64_add(ktls_offload_corrupted_records, 1);
CURVNET_SET(so->so_vnet);
so->so_proto->pr_usrreqs->pru_abort(so);
so->so_error = error;
CURVNET_RESTORE();
goto deref;
}
/* Is the entire record queued? */
if (sb->sb_tlscc < tls_len)
break;
/*
* Split out the portion of the mbuf chain containing
* this TLS record.
*/
data = ktls_detach_record(sb, tls_len);
if (data == NULL)
continue;
MPASS(sb->sb_tlsdcc == tls_len);
seqno = sb->sb_tls_seqno;
sb->sb_tls_seqno++;
SBCHECK(sb);
SOCKBUF_UNLOCK(sb);
error = tls->sw_decrypt(tls, hdr, data, seqno, &trail_len);
if (error == 0) {
if (tls13)
error = tls13_find_record_type(tls, data,
tls_len, &trail_len, &record_type);
else
record_type = hdr->tls_type;
}
if (error) {
counter_u64_add(ktls_offload_failed_crypto, 1);
SOCKBUF_LOCK(sb);
if (sb->sb_tlsdcc == 0) {
/*
* sbcut/drop/flush discarded these
* mbufs.
*/
m_freem(data);
break;
}
/*
* Drop this TLS record's data, but keep
* decrypting subsequent records.
*/
sb->sb_ccc -= tls_len;
sb->sb_tlsdcc = 0;
CURVNET_SET(so->so_vnet);
so->so_error = EBADMSG;
sorwakeup_locked(so);
CURVNET_RESTORE();
m_freem(data);
SOCKBUF_LOCK(sb);
continue;
}
/* Allocate the control mbuf. */
memset(&tgr, 0, sizeof(tgr));
tgr.tls_type = record_type;
tgr.tls_vmajor = hdr->tls_vmajor;
tgr.tls_vminor = hdr->tls_vminor;
tgr.tls_length = htobe16(tls_len - tls->params.tls_hlen -
trail_len);
control = sbcreatecontrol_how(&tgr, sizeof(tgr),
TLS_GET_RECORD, IPPROTO_TCP, M_WAITOK);
SOCKBUF_LOCK(sb);
if (sb->sb_tlsdcc == 0) {
/* sbcut/drop/flush discarded these mbufs. */
MPASS(sb->sb_tlscc == 0);
m_freem(data);
m_freem(control);
break;
}
/*
* Clear the 'dcc' accounting in preparation for
* adding the decrypted record.
*/
sb->sb_ccc -= tls_len;
sb->sb_tlsdcc = 0;
SBCHECK(sb);
/* If there is no payload, drop all of the data. */
if (tgr.tls_length == htobe16(0)) {
m_freem(data);
data = NULL;
} else {
/* Trim header. */
remain = tls->params.tls_hlen;
while (remain > 0) {
if (data->m_len > remain) {
data->m_data += remain;
data->m_len -= remain;
break;
}
remain -= data->m_len;
data = m_free(data);
}
/* Trim trailer and clear M_NOTREADY. */
remain = be16toh(tgr.tls_length);
m = data;
for (m = data; remain > m->m_len; m = m->m_next) {
m->m_flags &= ~M_NOTREADY;
remain -= m->m_len;
}
m->m_len = remain;
m_freem(m->m_next);
m->m_next = NULL;
m->m_flags &= ~M_NOTREADY;
/* Set EOR on the final mbuf. */
m->m_flags |= M_EOR;
}
sbappendcontrol_locked(sb, data, control, 0);
}
sb->sb_flags &= ~SB_TLS_RX_RUNNING;
if ((sb->sb_state & SBS_CANTRCVMORE) != 0 && sb->sb_tlscc > 0)
so->so_error = EMSGSIZE;
sorwakeup_locked(so);
deref:
SOCKBUF_UNLOCK_ASSERT(sb);
CURVNET_SET(so->so_vnet);
sorele(so);
CURVNET_RESTORE();
}
void
ktls_enqueue_to_free(struct mbuf *m)
{
struct ktls_wq *wq;
bool running;
/* Mark it for freeing. */
m->m_epg_flags |= EPG_FLAG_2FREE;
wq = &ktls_wq[m->m_epg_tls->wq_index];
mtx_lock(&wq->mtx);
STAILQ_INSERT_TAIL(&wq->m_head, m, m_epg_stailq);
running = wq->running;
mtx_unlock(&wq->mtx);
if (!running)
wakeup(wq);
}
static void *
ktls_buffer_alloc(struct ktls_wq *wq, struct mbuf *m)
{
void *buf;
int domain, running;
if (m->m_epg_npgs <= 2)
return (NULL);
if (ktls_buffer_zone == NULL)
return (NULL);
if ((u_int)(ticks - wq->lastallocfail) < hz) {
/*
* Rate-limit allocation attempts after a failure.
* ktls_buffer_import() will acquire a per-domain mutex to check
* the free page queues and may fail consistently if memory is
* fragmented.
*/
return (NULL);
}
buf = uma_zalloc(ktls_buffer_zone, M_NOWAIT | M_NORECLAIM);
if (buf == NULL) {
domain = PCPU_GET(domain);
wq->lastallocfail = ticks;
/*
* Note that this check is "racy", but the races are
* harmless, and are either a spurious wakeup if
* multiple threads fail allocations before the alloc
* thread wakes, or waiting an extra second in case we
* see an old value of running == true.
*/
if (!VM_DOMAIN_EMPTY(domain)) {
running = atomic_load_int(&ktls_domains[domain].alloc_td.running);
if (!running)
wakeup(&ktls_domains[domain].alloc_td);
}
}
return (buf);
}
static int
ktls_encrypt_record(struct ktls_wq *wq, struct mbuf *m,
struct ktls_session *tls, struct ktls_ocf_encrypt_state *state)
{
vm_page_t pg;
int error, i, len, off;
KASSERT((m->m_flags & (M_EXTPG | M_NOTREADY)) == (M_EXTPG | M_NOTREADY),
("%p not unready & nomap mbuf\n", m));
KASSERT(ptoa(m->m_epg_npgs) <= ktls_maxlen,
("page count %d larger than maximum frame length %d", m->m_epg_npgs,
ktls_maxlen));
/* Anonymous mbufs are encrypted in place. */
if ((m->m_epg_flags & EPG_FLAG_ANON) != 0)
return (tls->sw_encrypt(state, tls, m, NULL, 0));
/*
* For file-backed mbufs (from sendfile), anonymous wired
* pages are allocated and used as the encryption destination.
*/
if ((state->cbuf = ktls_buffer_alloc(wq, m)) != NULL) {
len = ptoa(m->m_epg_npgs - 1) + m->m_epg_last_len -
m->m_epg_1st_off;
state->dst_iov[0].iov_base = (char *)state->cbuf +
m->m_epg_1st_off;
state->dst_iov[0].iov_len = len;
state->parray[0] = DMAP_TO_PHYS((vm_offset_t)state->cbuf);
i = 1;
} else {
off = m->m_epg_1st_off;
for (i = 0; i < m->m_epg_npgs; i++, off = 0) {
pg = vm_page_alloc_noobj(VM_ALLOC_NODUMP |
VM_ALLOC_WIRED | VM_ALLOC_WAITOK);
len = m_epg_pagelen(m, i, off);
state->parray[i] = VM_PAGE_TO_PHYS(pg);
state->dst_iov[i].iov_base =
(char *)PHYS_TO_DMAP(state->parray[i]) + off;
state->dst_iov[i].iov_len = len;
}
}
KASSERT(i + 1 <= nitems(state->dst_iov), ("dst_iov is too small"));
state->dst_iov[i].iov_base = m->m_epg_trail;
state->dst_iov[i].iov_len = m->m_epg_trllen;
error = tls->sw_encrypt(state, tls, m, state->dst_iov, i + 1);
if (__predict_false(error != 0)) {
/* Free the anonymous pages. */
if (state->cbuf != NULL)
uma_zfree(ktls_buffer_zone, state->cbuf);
else {
for (i = 0; i < m->m_epg_npgs; i++) {
pg = PHYS_TO_VM_PAGE(state->parray[i]);
(void)vm_page_unwire_noq(pg);
vm_page_free(pg);
}
}
}
return (error);
}
/* Number of TLS records in a batch passed to ktls_enqueue(). */
static u_int
ktls_batched_records(struct mbuf *m)
{
int page_count, records;
records = 0;
page_count = m->m_epg_enc_cnt;
while (page_count > 0) {
records++;
page_count -= m->m_epg_nrdy;
m = m->m_next;
}
KASSERT(page_count == 0, ("%s: mismatched page count", __func__));
return (records);
}
void
ktls_enqueue(struct mbuf *m, struct socket *so, int page_count)
{
struct ktls_session *tls;
struct ktls_wq *wq;
int queued;
bool running;
KASSERT(((m->m_flags & (M_EXTPG | M_NOTREADY)) ==
(M_EXTPG | M_NOTREADY)),
("ktls_enqueue: %p not unready & nomap mbuf\n", m));
KASSERT(page_count != 0, ("enqueueing TLS mbuf with zero page count"));
KASSERT(m->m_epg_tls->mode == TCP_TLS_MODE_SW, ("!SW TLS mbuf"));
m->m_epg_enc_cnt = page_count;
/*
* Save a pointer to the socket. The caller is responsible
* for taking an additional reference via soref().
*/
m->m_epg_so = so;
queued = 1;
tls = m->m_epg_tls;
wq = &ktls_wq[tls->wq_index];
mtx_lock(&wq->mtx);
if (__predict_false(tls->sequential_records)) {
/*
* For TLS 1.0, records must be encrypted
* sequentially. For a given connection, all records
* queued to the associated work queue are processed
* sequentially. However, sendfile(2) might complete
* I/O requests spanning multiple TLS records out of
* order. Here we ensure TLS records are enqueued to
* the work queue in FIFO order.
*
* tls->next_seqno holds the sequence number of the
* next TLS record that should be enqueued to the work
* queue. If this next record is not tls->next_seqno,
* it must be a future record, so insert it, sorted by
* TLS sequence number, into tls->pending_records and
* return.
*
* If this TLS record matches tls->next_seqno, place
* it in the work queue and then check
* tls->pending_records to see if any
* previously-queued records are now ready for
* encryption.
*/
if (m->m_epg_seqno != tls->next_seqno) {
struct mbuf *n, *p;
p = NULL;
STAILQ_FOREACH(n, &tls->pending_records, m_epg_stailq) {
if (n->m_epg_seqno > m->m_epg_seqno)
break;
p = n;
}
if (n == NULL)
STAILQ_INSERT_TAIL(&tls->pending_records, m,
m_epg_stailq);
else if (p == NULL)
STAILQ_INSERT_HEAD(&tls->pending_records, m,
m_epg_stailq);
else
STAILQ_INSERT_AFTER(&tls->pending_records, p, m,
m_epg_stailq);
mtx_unlock(&wq->mtx);
counter_u64_add(ktls_cnt_tx_pending, 1);
return;
}
tls->next_seqno += ktls_batched_records(m);
STAILQ_INSERT_TAIL(&wq->m_head, m, m_epg_stailq);
while (!STAILQ_EMPTY(&tls->pending_records)) {
struct mbuf *n;
n = STAILQ_FIRST(&tls->pending_records);
if (n->m_epg_seqno != tls->next_seqno)
break;
queued++;
STAILQ_REMOVE_HEAD(&tls->pending_records, m_epg_stailq);
tls->next_seqno += ktls_batched_records(n);
STAILQ_INSERT_TAIL(&wq->m_head, n, m_epg_stailq);
}
counter_u64_add(ktls_cnt_tx_pending, -(queued - 1));
} else
STAILQ_INSERT_TAIL(&wq->m_head, m, m_epg_stailq);
running = wq->running;
mtx_unlock(&wq->mtx);
if (!running)
wakeup(wq);
counter_u64_add(ktls_cnt_tx_queued, queued);
}
/*
* Once a file-backed mbuf (from sendfile) has been encrypted, free
* the pages from the file and replace them with the anonymous pages
* allocated in ktls_encrypt_record().
*/
static void
ktls_finish_nonanon(struct mbuf *m, struct ktls_ocf_encrypt_state *state)
{
int i;
MPASS((m->m_epg_flags & EPG_FLAG_ANON) == 0);
/* Free the old pages. */
m->m_ext.ext_free(m);
/* Replace them with the new pages. */
if (state->cbuf != NULL) {
for (i = 0; i < m->m_epg_npgs; i++)
m->m_epg_pa[i] = state->parray[0] + ptoa(i);
/* Contig pages should go back to the cache. */
m->m_ext.ext_free = ktls_free_mext_contig;
} else {
for (i = 0; i < m->m_epg_npgs; i++)
m->m_epg_pa[i] = state->parray[i];
/* Use the basic free routine. */
m->m_ext.ext_free = mb_free_mext_pgs;
}
/* Pages are now writable. */
m->m_epg_flags |= EPG_FLAG_ANON;
}
static __noinline void
ktls_encrypt(struct ktls_wq *wq, struct mbuf *top)
{
struct ktls_ocf_encrypt_state state;
struct ktls_session *tls;
struct socket *so;
struct mbuf *m;
int error, npages, total_pages;
so = top->m_epg_so;
tls = top->m_epg_tls;
KASSERT(tls != NULL, ("tls = NULL, top = %p\n", top));
KASSERT(so != NULL, ("so = NULL, top = %p\n", top));
#ifdef INVARIANTS
top->m_epg_so = NULL;
#endif
total_pages = top->m_epg_enc_cnt;
npages = 0;
/*
* Encrypt the TLS records in the chain of mbufs starting with
* 'top'. 'total_pages' gives us a total count of pages and is
* used to know when we have finished encrypting the TLS
* records originally queued with 'top'.
*
* NB: These mbufs are queued in the socket buffer and
* 'm_next' is traversing the mbufs in the socket buffer. The
* socket buffer lock is not held while traversing this chain.
* Since the mbufs are all marked M_NOTREADY their 'm_next'
* pointers should be stable. However, the 'm_next' of the
* last mbuf encrypted is not necessarily NULL. It can point
* to other mbufs appended while 'top' was on the TLS work
* queue.
*
* Each mbuf holds an entire TLS record.
*/
error = 0;
for (m = top; npages != total_pages; m = m->m_next) {
KASSERT(m->m_epg_tls == tls,
("different TLS sessions in a single mbuf chain: %p vs %p",
tls, m->m_epg_tls));
KASSERT(npages + m->m_epg_npgs <= total_pages,
("page count mismatch: top %p, total_pages %d, m %p", top,
total_pages, m));
error = ktls_encrypt_record(wq, m, tls, &state);
if (error) {
counter_u64_add(ktls_offload_failed_crypto, 1);
break;
}
if ((m->m_epg_flags & EPG_FLAG_ANON) == 0)
ktls_finish_nonanon(m, &state);
npages += m->m_epg_nrdy;
/*
* Drop a reference to the session now that it is no
* longer needed. Existing code depends on encrypted
* records having no associated session vs
* yet-to-be-encrypted records having an associated
* session.
*/
m->m_epg_tls = NULL;
ktls_free(tls);
}
CURVNET_SET(so->so_vnet);
if (error == 0) {
(void)(*so->so_proto->pr_usrreqs->pru_ready)(so, top, npages);
} else {
so->so_proto->pr_usrreqs->pru_abort(so);
so->so_error = EIO;
mb_free_notready(top, total_pages);
}
sorele(so);
CURVNET_RESTORE();
}
void
ktls_encrypt_cb(struct ktls_ocf_encrypt_state *state, int error)
{
struct ktls_session *tls;
struct socket *so;
struct mbuf *m;
int npages;
m = state->m;
if ((m->m_epg_flags & EPG_FLAG_ANON) == 0)
ktls_finish_nonanon(m, state);
so = state->so;
free(state, M_KTLS);
/*
* Drop a reference to the session now that it is no longer
* needed. Existing code depends on encrypted records having
* no associated session vs yet-to-be-encrypted records having
* an associated session.
*/
tls = m->m_epg_tls;
m->m_epg_tls = NULL;
ktls_free(tls);
if (error != 0)
counter_u64_add(ktls_offload_failed_crypto, 1);
CURVNET_SET(so->so_vnet);
npages = m->m_epg_nrdy;
if (error == 0) {
(void)(*so->so_proto->pr_usrreqs->pru_ready)(so, m, npages);
} else {
so->so_proto->pr_usrreqs->pru_abort(so);
so->so_error = EIO;
mb_free_notready(m, npages);
}
sorele(so);
CURVNET_RESTORE();
}
/*
* Similar to ktls_encrypt, but used with asynchronous OCF backends
* (coprocessors) where encryption does not use host CPU resources and
* it can be beneficial to queue more requests than CPUs.
*/
static __noinline void
ktls_encrypt_async(struct ktls_wq *wq, struct mbuf *top)
{
struct ktls_ocf_encrypt_state *state;
struct ktls_session *tls;
struct socket *so;
struct mbuf *m, *n;
int error, mpages, npages, total_pages;
so = top->m_epg_so;
tls = top->m_epg_tls;
KASSERT(tls != NULL, ("tls = NULL, top = %p\n", top));
KASSERT(so != NULL, ("so = NULL, top = %p\n", top));
#ifdef INVARIANTS
top->m_epg_so = NULL;
#endif
total_pages = top->m_epg_enc_cnt;
npages = 0;
error = 0;
for (m = top; npages != total_pages; m = n) {
KASSERT(m->m_epg_tls == tls,
("different TLS sessions in a single mbuf chain: %p vs %p",
tls, m->m_epg_tls));
KASSERT(npages + m->m_epg_npgs <= total_pages,
("page count mismatch: top %p, total_pages %d, m %p", top,
total_pages, m));
state = malloc(sizeof(*state), M_KTLS, M_WAITOK | M_ZERO);
soref(so);
state->so = so;
state->m = m;
mpages = m->m_epg_nrdy;
n = m->m_next;
error = ktls_encrypt_record(wq, m, tls, state);
if (error) {
counter_u64_add(ktls_offload_failed_crypto, 1);
free(state, M_KTLS);
CURVNET_SET(so->so_vnet);
sorele(so);
CURVNET_RESTORE();
break;
}
npages += mpages;
}
CURVNET_SET(so->so_vnet);
if (error != 0) {
so->so_proto->pr_usrreqs->pru_abort(so);
so->so_error = EIO;
mb_free_notready(m, total_pages - npages);
}
sorele(so);
CURVNET_RESTORE();
}
static int
ktls_bind_domain(int domain)
{
int error;
error = cpuset_setthread(curthread->td_tid, &cpuset_domain[domain]);
if (error != 0)
return (error);
curthread->td_domain.dr_policy = DOMAINSET_PREF(domain);
return (0);
}
static void
ktls_alloc_thread(void *ctx)
{
struct ktls_domain_info *ktls_domain = ctx;
struct ktls_alloc_thread *sc = &ktls_domain->alloc_td;
void **buf;
struct sysctl_oid *oid;
char name[80];
int domain, error, i, nbufs;
domain = ktls_domain - ktls_domains;
if (bootverbose)
printf("Starting KTLS alloc thread for domain %d\n", domain);
error = ktls_bind_domain(domain);
if (error)
printf("Unable to bind KTLS alloc thread for domain %d: error %d\n",
domain, error);
snprintf(name, sizeof(name), "domain%d", domain);
oid = SYSCTL_ADD_NODE(NULL, SYSCTL_STATIC_CHILDREN(_kern_ipc_tls), OID_AUTO,
name, CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "");
SYSCTL_ADD_U64(NULL, SYSCTL_CHILDREN(oid), OID_AUTO, "allocs",
CTLFLAG_RD, &sc->allocs, 0, "buffers allocated");
SYSCTL_ADD_U64(NULL, SYSCTL_CHILDREN(oid), OID_AUTO, "wakeups",
CTLFLAG_RD, &sc->wakeups, 0, "thread wakeups");
SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO, "running",
CTLFLAG_RD, &sc->running, 0, "thread running");
buf = NULL;
nbufs = 0;
for (;;) {
atomic_store_int(&sc->running, 0);
tsleep(sc, PZERO | PNOLOCK, "-", 0);
atomic_store_int(&sc->running, 1);
sc->wakeups++;
if (nbufs != ktls_max_alloc) {
free(buf, M_KTLS);
nbufs = atomic_load_int(&ktls_max_alloc);
buf = malloc(sizeof(void *) * nbufs, M_KTLS,
M_WAITOK | M_ZERO);
}
/*
* Below we allocate nbufs with different allocation
* flags than we use when allocating normally during
* encryption in the ktls worker thread. We specify
* M_NORECLAIM in the worker thread. However, we omit
* that flag here and add M_WAITOK so that the VM
* system is permitted to perform expensive work to
* defragment memory. We do this here, as it does not
* matter if this thread blocks. If we block a ktls
* worker thread, we risk developing backlogs of
* buffers to be encrypted, leading to surges of
* traffic and potential NIC output drops.
*/
for (i = 0; i < nbufs; i++) {
buf[i] = uma_zalloc(ktls_buffer_zone, M_WAITOK);
sc->allocs++;
}
for (i = 0; i < nbufs; i++) {
uma_zfree(ktls_buffer_zone, buf[i]);
buf[i] = NULL;
}
}
}
static void
ktls_work_thread(void *ctx)
{
struct ktls_wq *wq = ctx;
struct mbuf *m, *n;
struct socket *so, *son;
STAILQ_HEAD(, mbuf) local_m_head;
STAILQ_HEAD(, socket) local_so_head;
int cpu;
cpu = wq - ktls_wq;
if (bootverbose)
printf("Starting KTLS worker thread for CPU %d\n", cpu);
/*
* Bind to a core. If ktls_bind_threads is > 1, then
* we bind to the NUMA domain instead.
*/
if (ktls_bind_threads) {
int error;
if (ktls_bind_threads > 1) {
struct pcpu *pc = pcpu_find(cpu);
error = ktls_bind_domain(pc->pc_domain);
} else {
cpuset_t mask;
CPU_SETOF(cpu, &mask);
error = cpuset_setthread(curthread->td_tid, &mask);
}
if (error)
printf("Unable to bind KTLS worker thread for CPU %d: error %d\n",
cpu, error);
}
#if defined(__aarch64__) || defined(__amd64__) || defined(__i386__)
fpu_kern_thread(0);
#endif
for (;;) {
mtx_lock(&wq->mtx);
while (STAILQ_EMPTY(&wq->m_head) &&
STAILQ_EMPTY(&wq->so_head)) {
wq->running = false;
mtx_sleep(wq, &wq->mtx, 0, "-", 0);
wq->running = true;
}
STAILQ_INIT(&local_m_head);
STAILQ_CONCAT(&local_m_head, &wq->m_head);
STAILQ_INIT(&local_so_head);
STAILQ_CONCAT(&local_so_head, &wq->so_head);
mtx_unlock(&wq->mtx);
STAILQ_FOREACH_SAFE(m, &local_m_head, m_epg_stailq, n) {
if (m->m_epg_flags & EPG_FLAG_2FREE) {
ktls_free(m->m_epg_tls);
m_free_raw(m);
} else {
if (m->m_epg_tls->sync_dispatch)
ktls_encrypt(wq, m);
else
ktls_encrypt_async(wq, m);
counter_u64_add(ktls_cnt_tx_queued, -1);
}
}
STAILQ_FOREACH_SAFE(so, &local_so_head, so_ktls_rx_list, son) {
ktls_decrypt(so);
counter_u64_add(ktls_cnt_rx_queued, -1);
}
}
}
#if defined(INET) || defined(INET6)
static void
ktls_disable_ifnet_help(void *context, int pending __unused)
{
struct ktls_session *tls;
struct inpcb *inp;
struct tcpcb *tp;
struct socket *so;
int err;
tls = context;
inp = tls->inp;
if (inp == NULL)
return;
INP_WLOCK(inp);
so = inp->inp_socket;
MPASS(so != NULL);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
goto out;
}
if (so->so_snd.sb_tls_info != NULL)
err = ktls_set_tx_mode(so, TCP_TLS_MODE_SW);
else
err = ENXIO;
if (err == 0) {
counter_u64_add(ktls_ifnet_disable_ok, 1);
/* ktls_set_tx_mode() drops inp wlock, so recheck flags */
if ((inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) == 0 &&
(tp = intotcpcb(inp)) != NULL &&
tp->t_fb->tfb_hwtls_change != NULL)
(*tp->t_fb->tfb_hwtls_change)(tp, 0);
} else {
counter_u64_add(ktls_ifnet_disable_fail, 1);
}
out:
sorele(so);
if (!in_pcbrele_wlocked(inp))
INP_WUNLOCK(inp);
ktls_free(tls);
}
/*
* Called when re-transmits are becoming a substantial portion of the
* sends on this connection. When this happens, we transition the
* connection to software TLS. This is needed because most inline TLS
* NICs keep crypto state only for in-order transmits. This means
* that to handle a TCP rexmit (which is out-of-order), the NIC must
* re-DMA the entire TLS record up to and including the current
* segment. This means that when re-transmitting the last ~1448 byte
* segment of a 16KB TLS record, we could wind up re-DMA'ing an order
* of magnitude more data than we are sending. This can cause the
* PCIe link to saturate well before the network, which can cause
* output drops, and a general loss of capacity.
*/
void
ktls_disable_ifnet(void *arg)
{
struct tcpcb *tp;
struct inpcb *inp;
struct socket *so;
struct ktls_session *tls;
tp = arg;
inp = tp->t_inpcb;
INP_WLOCK_ASSERT(inp);
so = inp->inp_socket;
SOCK_LOCK(so);
tls = so->so_snd.sb_tls_info;
if (tls->disable_ifnet_pending) {
SOCK_UNLOCK(so);
return;
}
/*
* note that disable_ifnet_pending is never cleared; disabling
* ifnet can only be done once per session, so we never want
* to do it again
*/
(void)ktls_hold(tls);
in_pcbref(inp);
soref(so);
tls->disable_ifnet_pending = true;
tls->inp = inp;
SOCK_UNLOCK(so);
TASK_INIT(&tls->disable_ifnet_task, 0, ktls_disable_ifnet_help, tls);
(void)taskqueue_enqueue(taskqueue_thread, &tls->disable_ifnet_task);
}
#endif
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