Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1 | /* Copyright (c) 2018, Mellanox Technologies All rights reserved. |
| 2 | * |
| 3 | * This software is available to you under a choice of one of two |
| 4 | * licenses. You may choose to be licensed under the terms of the GNU |
| 5 | * General Public License (GPL) Version 2, available from the file |
| 6 | * COPYING in the main directory of this source tree, or the |
| 7 | * OpenIB.org BSD license below: |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or |
| 10 | * without modification, are permitted provided that the following |
| 11 | * conditions are met: |
| 12 | * |
| 13 | * - Redistributions of source code must retain the above |
| 14 | * copyright notice, this list of conditions and the following |
| 15 | * disclaimer. |
| 16 | * |
| 17 | * - Redistributions in binary form must reproduce the above |
| 18 | * copyright notice, this list of conditions and the following |
| 19 | * disclaimer in the documentation and/or other materials |
| 20 | * provided with the distribution. |
| 21 | * |
| 22 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 23 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 24 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 25 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| 26 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| 27 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 28 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 29 | * SOFTWARE. |
| 30 | */ |
| 31 | |
| 32 | #include <crypto/aead.h> |
| 33 | #include <linux/highmem.h> |
| 34 | #include <linux/module.h> |
| 35 | #include <linux/netdevice.h> |
| 36 | #include <net/dst.h> |
| 37 | #include <net/inet_connection_sock.h> |
| 38 | #include <net/tcp.h> |
| 39 | #include <net/tls.h> |
| 40 | |
Jakub Kicinski | 8538d29 | 2019-10-04 16:19:22 -0700 | [diff] [blame] | 41 | #include "trace.h" |
| 42 | |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 43 | /* device_offload_lock is used to synchronize tls_dev_add |
| 44 | * against NETDEV_DOWN notifications. |
| 45 | */ |
| 46 | static DECLARE_RWSEM(device_offload_lock); |
| 47 | |
| 48 | static void tls_device_gc_task(struct work_struct *work); |
| 49 | |
| 50 | static DECLARE_WORK(tls_device_gc_work, tls_device_gc_task); |
| 51 | static LIST_HEAD(tls_device_gc_list); |
| 52 | static LIST_HEAD(tls_device_list); |
| 53 | static DEFINE_SPINLOCK(tls_device_lock); |
| 54 | |
| 55 | static void tls_device_free_ctx(struct tls_context *ctx) |
| 56 | { |
Jakub Kicinski | 5a03bc7 | 2019-04-10 11:04:30 -0700 | [diff] [blame] | 57 | if (ctx->tx_conf == TLS_HW) { |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 58 | kfree(tls_offload_ctx_tx(ctx)); |
Jakub Kicinski | 5a03bc7 | 2019-04-10 11:04:30 -0700 | [diff] [blame] | 59 | kfree(ctx->tx.rec_seq); |
| 60 | kfree(ctx->tx.iv); |
| 61 | } |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 62 | |
| 63 | if (ctx->rx_conf == TLS_HW) |
| 64 | kfree(tls_offload_ctx_rx(ctx)); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 65 | |
Jakub Kicinski | 15a7dea | 2019-08-30 12:25:47 +0200 | [diff] [blame] | 66 | tls_ctx_free(NULL, ctx); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 67 | } |
| 68 | |
| 69 | static void tls_device_gc_task(struct work_struct *work) |
| 70 | { |
| 71 | struct tls_context *ctx, *tmp; |
| 72 | unsigned long flags; |
| 73 | LIST_HEAD(gc_list); |
| 74 | |
| 75 | spin_lock_irqsave(&tls_device_lock, flags); |
| 76 | list_splice_init(&tls_device_gc_list, &gc_list); |
| 77 | spin_unlock_irqrestore(&tls_device_lock, flags); |
| 78 | |
| 79 | list_for_each_entry_safe(ctx, tmp, &gc_list, list) { |
| 80 | struct net_device *netdev = ctx->netdev; |
| 81 | |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 82 | if (netdev && ctx->tx_conf == TLS_HW) { |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 83 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, |
| 84 | TLS_OFFLOAD_CTX_DIR_TX); |
| 85 | dev_put(netdev); |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 86 | ctx->netdev = NULL; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 87 | } |
| 88 | |
| 89 | list_del(&ctx->list); |
| 90 | tls_device_free_ctx(ctx); |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | static void tls_device_queue_ctx_destruction(struct tls_context *ctx) |
| 95 | { |
| 96 | unsigned long flags; |
| 97 | |
| 98 | spin_lock_irqsave(&tls_device_lock, flags); |
| 99 | list_move_tail(&ctx->list, &tls_device_gc_list); |
| 100 | |
| 101 | /* schedule_work inside the spinlock |
| 102 | * to make sure tls_device_down waits for that work. |
| 103 | */ |
| 104 | schedule_work(&tls_device_gc_work); |
| 105 | |
| 106 | spin_unlock_irqrestore(&tls_device_lock, flags); |
| 107 | } |
| 108 | |
| 109 | /* We assume that the socket is already connected */ |
| 110 | static struct net_device *get_netdev_for_sock(struct sock *sk) |
| 111 | { |
| 112 | struct dst_entry *dst = sk_dst_get(sk); |
| 113 | struct net_device *netdev = NULL; |
| 114 | |
| 115 | if (likely(dst)) { |
| 116 | netdev = dst->dev; |
| 117 | dev_hold(netdev); |
| 118 | } |
| 119 | |
| 120 | dst_release(dst); |
| 121 | |
| 122 | return netdev; |
| 123 | } |
| 124 | |
| 125 | static void destroy_record(struct tls_record_info *record) |
| 126 | { |
Jakub Kicinski | 7ccd451 | 2019-09-06 22:29:57 -0700 | [diff] [blame] | 127 | int i; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 128 | |
Jakub Kicinski | 7ccd451 | 2019-09-06 22:29:57 -0700 | [diff] [blame] | 129 | for (i = 0; i < record->num_frags; i++) |
| 130 | __skb_frag_unref(&record->frags[i]); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 131 | kfree(record); |
| 132 | } |
| 133 | |
Boris Pismenny | d80a1b9d | 2018-07-13 14:33:39 +0300 | [diff] [blame] | 134 | static void delete_all_records(struct tls_offload_context_tx *offload_ctx) |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 135 | { |
| 136 | struct tls_record_info *info, *temp; |
| 137 | |
| 138 | list_for_each_entry_safe(info, temp, &offload_ctx->records_list, list) { |
| 139 | list_del(&info->list); |
| 140 | destroy_record(info); |
| 141 | } |
| 142 | |
| 143 | offload_ctx->retransmit_hint = NULL; |
| 144 | } |
| 145 | |
| 146 | static void tls_icsk_clean_acked(struct sock *sk, u32 acked_seq) |
| 147 | { |
| 148 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
| 149 | struct tls_record_info *info, *temp; |
Boris Pismenny | d80a1b9d | 2018-07-13 14:33:39 +0300 | [diff] [blame] | 150 | struct tls_offload_context_tx *ctx; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 151 | u64 deleted_records = 0; |
| 152 | unsigned long flags; |
| 153 | |
| 154 | if (!tls_ctx) |
| 155 | return; |
| 156 | |
Boris Pismenny | d80a1b9d | 2018-07-13 14:33:39 +0300 | [diff] [blame] | 157 | ctx = tls_offload_ctx_tx(tls_ctx); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 158 | |
| 159 | spin_lock_irqsave(&ctx->lock, flags); |
| 160 | info = ctx->retransmit_hint; |
Jakub Kicinski | 6e3d02b | 2019-09-02 21:31:06 -0700 | [diff] [blame] | 161 | if (info && !before(acked_seq, info->end_seq)) |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 162 | ctx->retransmit_hint = NULL; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 163 | |
| 164 | list_for_each_entry_safe(info, temp, &ctx->records_list, list) { |
| 165 | if (before(acked_seq, info->end_seq)) |
| 166 | break; |
| 167 | list_del(&info->list); |
| 168 | |
| 169 | destroy_record(info); |
| 170 | deleted_records++; |
| 171 | } |
| 172 | |
| 173 | ctx->unacked_record_sn += deleted_records; |
| 174 | spin_unlock_irqrestore(&ctx->lock, flags); |
| 175 | } |
| 176 | |
| 177 | /* At this point, there should be no references on this |
| 178 | * socket and no in-flight SKBs associated with this |
| 179 | * socket, so it is safe to free all the resources. |
| 180 | */ |
Jakub Kicinski | 8d5a49e | 2019-12-17 14:12:01 -0800 | [diff] [blame] | 181 | void tls_device_sk_destruct(struct sock *sk) |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 182 | { |
| 183 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
Boris Pismenny | d80a1b9d | 2018-07-13 14:33:39 +0300 | [diff] [blame] | 184 | struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 185 | |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 186 | tls_ctx->sk_destruct(sk); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 187 | |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 188 | if (tls_ctx->tx_conf == TLS_HW) { |
| 189 | if (ctx->open_record) |
| 190 | destroy_record(ctx->open_record); |
| 191 | delete_all_records(ctx); |
| 192 | crypto_free_aead(ctx->aead_send); |
| 193 | clean_acked_data_disable(inet_csk(sk)); |
| 194 | } |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 195 | |
| 196 | if (refcount_dec_and_test(&tls_ctx->refcount)) |
| 197 | tls_device_queue_ctx_destruction(tls_ctx); |
| 198 | } |
Jakub Kicinski | 8d5a49e | 2019-12-17 14:12:01 -0800 | [diff] [blame] | 199 | EXPORT_SYMBOL_GPL(tls_device_sk_destruct); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 200 | |
Jakub Kicinski | 35b71a34 | 2019-04-10 11:04:31 -0700 | [diff] [blame] | 201 | void tls_device_free_resources_tx(struct sock *sk) |
| 202 | { |
| 203 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
| 204 | |
| 205 | tls_free_partial_record(sk, tls_ctx); |
| 206 | } |
| 207 | |
Jakub Kicinski | 8538d29 | 2019-10-04 16:19:22 -0700 | [diff] [blame] | 208 | void tls_offload_tx_resync_request(struct sock *sk, u32 got_seq, u32 exp_seq) |
| 209 | { |
| 210 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
| 211 | |
| 212 | trace_tls_device_tx_resync_req(sk, got_seq, exp_seq); |
| 213 | WARN_ON(test_and_set_bit(TLS_TX_SYNC_SCHED, &tls_ctx->flags)); |
| 214 | } |
| 215 | EXPORT_SYMBOL_GPL(tls_offload_tx_resync_request); |
| 216 | |
Jakub Kicinski | 5018007 | 2019-06-10 21:40:09 -0700 | [diff] [blame] | 217 | static void tls_device_resync_tx(struct sock *sk, struct tls_context *tls_ctx, |
| 218 | u32 seq) |
| 219 | { |
| 220 | struct net_device *netdev; |
| 221 | struct sk_buff *skb; |
Dirk van der Merwe | b5d9a83 | 2019-07-08 19:53:13 -0700 | [diff] [blame] | 222 | int err = 0; |
Jakub Kicinski | 5018007 | 2019-06-10 21:40:09 -0700 | [diff] [blame] | 223 | u8 *rcd_sn; |
| 224 | |
| 225 | skb = tcp_write_queue_tail(sk); |
| 226 | if (skb) |
| 227 | TCP_SKB_CB(skb)->eor = 1; |
| 228 | |
| 229 | rcd_sn = tls_ctx->tx.rec_seq; |
| 230 | |
Jakub Kicinski | 8538d29 | 2019-10-04 16:19:22 -0700 | [diff] [blame] | 231 | trace_tls_device_tx_resync_send(sk, seq, rcd_sn); |
Jakub Kicinski | 5018007 | 2019-06-10 21:40:09 -0700 | [diff] [blame] | 232 | down_read(&device_offload_lock); |
| 233 | netdev = tls_ctx->netdev; |
| 234 | if (netdev) |
Dirk van der Merwe | b5d9a83 | 2019-07-08 19:53:13 -0700 | [diff] [blame] | 235 | err = netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, |
| 236 | rcd_sn, |
| 237 | TLS_OFFLOAD_CTX_DIR_TX); |
Jakub Kicinski | 5018007 | 2019-06-10 21:40:09 -0700 | [diff] [blame] | 238 | up_read(&device_offload_lock); |
Dirk van der Merwe | b5d9a83 | 2019-07-08 19:53:13 -0700 | [diff] [blame] | 239 | if (err) |
| 240 | return; |
Jakub Kicinski | 5018007 | 2019-06-10 21:40:09 -0700 | [diff] [blame] | 241 | |
| 242 | clear_bit_unlock(TLS_TX_SYNC_SCHED, &tls_ctx->flags); |
| 243 | } |
| 244 | |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 245 | static void tls_append_frag(struct tls_record_info *record, |
| 246 | struct page_frag *pfrag, |
| 247 | int size) |
| 248 | { |
| 249 | skb_frag_t *frag; |
| 250 | |
| 251 | frag = &record->frags[record->num_frags - 1]; |
Matthew Wilcox (Oracle) | d8e18a5 | 2019-07-22 20:08:26 -0700 | [diff] [blame] | 252 | if (skb_frag_page(frag) == pfrag->page && |
Jonathan Lemon | b54c9d5 | 2019-07-30 07:40:33 -0700 | [diff] [blame] | 253 | skb_frag_off(frag) + skb_frag_size(frag) == pfrag->offset) { |
Matthew Wilcox (Oracle) | d8e18a5 | 2019-07-22 20:08:26 -0700 | [diff] [blame] | 254 | skb_frag_size_add(frag, size); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 255 | } else { |
| 256 | ++frag; |
Matthew Wilcox (Oracle) | d8e18a5 | 2019-07-22 20:08:26 -0700 | [diff] [blame] | 257 | __skb_frag_set_page(frag, pfrag->page); |
Jonathan Lemon | b54c9d5 | 2019-07-30 07:40:33 -0700 | [diff] [blame] | 258 | skb_frag_off_set(frag, pfrag->offset); |
Matthew Wilcox (Oracle) | d8e18a5 | 2019-07-22 20:08:26 -0700 | [diff] [blame] | 259 | skb_frag_size_set(frag, size); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 260 | ++record->num_frags; |
| 261 | get_page(pfrag->page); |
| 262 | } |
| 263 | |
| 264 | pfrag->offset += size; |
| 265 | record->len += size; |
| 266 | } |
| 267 | |
| 268 | static int tls_push_record(struct sock *sk, |
| 269 | struct tls_context *ctx, |
Boris Pismenny | d80a1b9d | 2018-07-13 14:33:39 +0300 | [diff] [blame] | 270 | struct tls_offload_context_tx *offload_ctx, |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 271 | struct tls_record_info *record, |
Jakub Kicinski | e7b159a | 2019-09-06 22:29:59 -0700 | [diff] [blame] | 272 | int flags) |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 273 | { |
Vakul Garg | 4509de1 | 2019-02-14 07:11:35 +0000 | [diff] [blame] | 274 | struct tls_prot_info *prot = &ctx->prot_info; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 275 | struct tcp_sock *tp = tcp_sk(sk); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 276 | skb_frag_t *frag; |
| 277 | int i; |
| 278 | |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 279 | record->end_seq = tp->write_seq + record->len; |
Jakub Kicinski | d4774ac | 2019-09-06 22:29:58 -0700 | [diff] [blame] | 280 | list_add_tail_rcu(&record->list, &offload_ctx->records_list); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 281 | offload_ctx->open_record = NULL; |
Jakub Kicinski | 5018007 | 2019-06-10 21:40:09 -0700 | [diff] [blame] | 282 | |
| 283 | if (test_bit(TLS_TX_SYNC_SCHED, &ctx->flags)) |
| 284 | tls_device_resync_tx(sk, ctx, tp->write_seq); |
| 285 | |
Jakub Kicinski | fb0f886 | 2019-06-03 15:17:05 -0700 | [diff] [blame] | 286 | tls_advance_record_sn(sk, prot, &ctx->tx); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 287 | |
| 288 | for (i = 0; i < record->num_frags; i++) { |
| 289 | frag = &record->frags[i]; |
| 290 | sg_unmark_end(&offload_ctx->sg_tx_data[i]); |
| 291 | sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag), |
Jonathan Lemon | b54c9d5 | 2019-07-30 07:40:33 -0700 | [diff] [blame] | 292 | skb_frag_size(frag), skb_frag_off(frag)); |
Matthew Wilcox (Oracle) | d8e18a5 | 2019-07-22 20:08:26 -0700 | [diff] [blame] | 293 | sk_mem_charge(sk, skb_frag_size(frag)); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 294 | get_page(skb_frag_page(frag)); |
| 295 | } |
| 296 | sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]); |
| 297 | |
| 298 | /* all ready, send */ |
| 299 | return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags); |
| 300 | } |
| 301 | |
Jakub Kicinski | e7b159a | 2019-09-06 22:29:59 -0700 | [diff] [blame] | 302 | static int tls_device_record_close(struct sock *sk, |
| 303 | struct tls_context *ctx, |
| 304 | struct tls_record_info *record, |
| 305 | struct page_frag *pfrag, |
| 306 | unsigned char record_type) |
| 307 | { |
| 308 | struct tls_prot_info *prot = &ctx->prot_info; |
| 309 | int ret; |
| 310 | |
| 311 | /* append tag |
| 312 | * device will fill in the tag, we just need to append a placeholder |
| 313 | * use socket memory to improve coalescing (re-using a single buffer |
| 314 | * increases frag count) |
| 315 | * if we can't allocate memory now, steal some back from data |
| 316 | */ |
| 317 | if (likely(skb_page_frag_refill(prot->tag_size, pfrag, |
| 318 | sk->sk_allocation))) { |
| 319 | ret = 0; |
| 320 | tls_append_frag(record, pfrag, prot->tag_size); |
| 321 | } else { |
| 322 | ret = prot->tag_size; |
| 323 | if (record->len <= prot->overhead_size) |
| 324 | return -ENOMEM; |
| 325 | } |
| 326 | |
| 327 | /* fill prepend */ |
| 328 | tls_fill_prepend(ctx, skb_frag_address(&record->frags[0]), |
| 329 | record->len - prot->overhead_size, |
| 330 | record_type, prot->version); |
| 331 | return ret; |
| 332 | } |
| 333 | |
Boris Pismenny | d80a1b9d | 2018-07-13 14:33:39 +0300 | [diff] [blame] | 334 | static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx, |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 335 | struct page_frag *pfrag, |
| 336 | size_t prepend_size) |
| 337 | { |
| 338 | struct tls_record_info *record; |
| 339 | skb_frag_t *frag; |
| 340 | |
| 341 | record = kmalloc(sizeof(*record), GFP_KERNEL); |
| 342 | if (!record) |
| 343 | return -ENOMEM; |
| 344 | |
| 345 | frag = &record->frags[0]; |
| 346 | __skb_frag_set_page(frag, pfrag->page); |
Jonathan Lemon | b54c9d5 | 2019-07-30 07:40:33 -0700 | [diff] [blame] | 347 | skb_frag_off_set(frag, pfrag->offset); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 348 | skb_frag_size_set(frag, prepend_size); |
| 349 | |
| 350 | get_page(pfrag->page); |
| 351 | pfrag->offset += prepend_size; |
| 352 | |
| 353 | record->num_frags = 1; |
| 354 | record->len = prepend_size; |
| 355 | offload_ctx->open_record = record; |
| 356 | return 0; |
| 357 | } |
| 358 | |
| 359 | static int tls_do_allocation(struct sock *sk, |
Boris Pismenny | d80a1b9d | 2018-07-13 14:33:39 +0300 | [diff] [blame] | 360 | struct tls_offload_context_tx *offload_ctx, |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 361 | struct page_frag *pfrag, |
| 362 | size_t prepend_size) |
| 363 | { |
| 364 | int ret; |
| 365 | |
| 366 | if (!offload_ctx->open_record) { |
| 367 | if (unlikely(!skb_page_frag_refill(prepend_size, pfrag, |
| 368 | sk->sk_allocation))) { |
Jakub Sitnicki | d5bee73 | 2020-03-17 18:04:39 +0100 | [diff] [blame] | 369 | READ_ONCE(sk->sk_prot)->enter_memory_pressure(sk); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 370 | sk_stream_moderate_sndbuf(sk); |
| 371 | return -ENOMEM; |
| 372 | } |
| 373 | |
| 374 | ret = tls_create_new_record(offload_ctx, pfrag, prepend_size); |
| 375 | if (ret) |
| 376 | return ret; |
| 377 | |
| 378 | if (pfrag->size > pfrag->offset) |
| 379 | return 0; |
| 380 | } |
| 381 | |
| 382 | if (!sk_page_frag_refill(sk, pfrag)) |
| 383 | return -ENOMEM; |
| 384 | |
| 385 | return 0; |
| 386 | } |
| 387 | |
Jakub Kicinski | e681cc6 | 2019-09-06 22:30:00 -0700 | [diff] [blame] | 388 | static int tls_device_copy_data(void *addr, size_t bytes, struct iov_iter *i) |
| 389 | { |
| 390 | size_t pre_copy, nocache; |
| 391 | |
| 392 | pre_copy = ~((unsigned long)addr - 1) & (SMP_CACHE_BYTES - 1); |
| 393 | if (pre_copy) { |
| 394 | pre_copy = min(pre_copy, bytes); |
| 395 | if (copy_from_iter(addr, pre_copy, i) != pre_copy) |
| 396 | return -EFAULT; |
| 397 | bytes -= pre_copy; |
| 398 | addr += pre_copy; |
| 399 | } |
| 400 | |
| 401 | nocache = round_down(bytes, SMP_CACHE_BYTES); |
| 402 | if (copy_from_iter_nocache(addr, nocache, i) != nocache) |
| 403 | return -EFAULT; |
| 404 | bytes -= nocache; |
| 405 | addr += nocache; |
| 406 | |
| 407 | if (bytes && copy_from_iter(addr, bytes, i) != bytes) |
| 408 | return -EFAULT; |
| 409 | |
| 410 | return 0; |
| 411 | } |
| 412 | |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 413 | static int tls_push_data(struct sock *sk, |
| 414 | struct iov_iter *msg_iter, |
| 415 | size_t size, int flags, |
| 416 | unsigned char record_type) |
| 417 | { |
| 418 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
Vakul Garg | 4509de1 | 2019-02-14 07:11:35 +0000 | [diff] [blame] | 419 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
Boris Pismenny | d80a1b9d | 2018-07-13 14:33:39 +0300 | [diff] [blame] | 420 | struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 421 | int more = flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE); |
| 422 | struct tls_record_info *record = ctx->open_record; |
Jakub Kicinski | 4147766 | 2019-08-07 17:03:59 -0700 | [diff] [blame] | 423 | int tls_push_record_flags; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 424 | struct page_frag *pfrag; |
| 425 | size_t orig_size = size; |
| 426 | u32 max_open_record_len; |
| 427 | int copy, rc = 0; |
| 428 | bool done = false; |
| 429 | long timeo; |
| 430 | |
| 431 | if (flags & |
| 432 | ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST)) |
Valentin Vidic | 4a5cdc6 | 2019-12-05 07:41:18 +0100 | [diff] [blame] | 433 | return -EOPNOTSUPP; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 434 | |
Jakub Kicinski | 93277b2 | 2019-10-06 21:09:28 -0700 | [diff] [blame] | 435 | if (unlikely(sk->sk_err)) |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 436 | return -sk->sk_err; |
| 437 | |
Jakub Kicinski | 4147766 | 2019-08-07 17:03:59 -0700 | [diff] [blame] | 438 | flags |= MSG_SENDPAGE_DECRYPTED; |
| 439 | tls_push_record_flags = flags | MSG_SENDPAGE_NOTLAST; |
| 440 | |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 441 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
Boris Pismenny | 9485025 | 2019-02-27 17:38:03 +0200 | [diff] [blame] | 442 | if (tls_is_partially_sent_record(tls_ctx)) { |
| 443 | rc = tls_push_partial_record(sk, tls_ctx, flags); |
| 444 | if (rc < 0) |
| 445 | return rc; |
| 446 | } |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 447 | |
| 448 | pfrag = sk_page_frag(sk); |
| 449 | |
| 450 | /* TLS_HEADER_SIZE is not counted as part of the TLS record, and |
| 451 | * we need to leave room for an authentication tag. |
| 452 | */ |
| 453 | max_open_record_len = TLS_MAX_PAYLOAD_SIZE + |
Vakul Garg | 4509de1 | 2019-02-14 07:11:35 +0000 | [diff] [blame] | 454 | prot->prepend_size; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 455 | do { |
Jakub Kicinski | 34ef1ed | 2019-10-06 21:09:29 -0700 | [diff] [blame] | 456 | rc = tls_do_allocation(sk, ctx, pfrag, prot->prepend_size); |
| 457 | if (unlikely(rc)) { |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 458 | rc = sk_stream_wait_memory(sk, &timeo); |
| 459 | if (!rc) |
| 460 | continue; |
| 461 | |
| 462 | record = ctx->open_record; |
| 463 | if (!record) |
| 464 | break; |
| 465 | handle_error: |
| 466 | if (record_type != TLS_RECORD_TYPE_DATA) { |
| 467 | /* avoid sending partial |
| 468 | * record with type != |
| 469 | * application_data |
| 470 | */ |
| 471 | size = orig_size; |
| 472 | destroy_record(record); |
| 473 | ctx->open_record = NULL; |
Vakul Garg | 4509de1 | 2019-02-14 07:11:35 +0000 | [diff] [blame] | 474 | } else if (record->len > prot->prepend_size) { |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 475 | goto last_record; |
| 476 | } |
| 477 | |
| 478 | break; |
| 479 | } |
| 480 | |
| 481 | record = ctx->open_record; |
| 482 | copy = min_t(size_t, size, (pfrag->size - pfrag->offset)); |
| 483 | copy = min_t(size_t, copy, (max_open_record_len - record->len)); |
| 484 | |
Jakub Kicinski | e681cc6 | 2019-09-06 22:30:00 -0700 | [diff] [blame] | 485 | rc = tls_device_copy_data(page_address(pfrag->page) + |
| 486 | pfrag->offset, copy, msg_iter); |
| 487 | if (rc) |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 488 | goto handle_error; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 489 | tls_append_frag(record, pfrag, copy); |
| 490 | |
| 491 | size -= copy; |
| 492 | if (!size) { |
| 493 | last_record: |
| 494 | tls_push_record_flags = flags; |
| 495 | if (more) { |
| 496 | tls_ctx->pending_open_record_frags = |
Daniel Borkmann | d829e9c | 2018-10-13 02:45:59 +0200 | [diff] [blame] | 497 | !!record->num_frags; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 498 | break; |
| 499 | } |
| 500 | |
| 501 | done = true; |
| 502 | } |
| 503 | |
| 504 | if (done || record->len >= max_open_record_len || |
| 505 | (record->num_frags >= MAX_SKB_FRAGS - 1)) { |
Jakub Kicinski | e7b159a | 2019-09-06 22:29:59 -0700 | [diff] [blame] | 506 | rc = tls_device_record_close(sk, tls_ctx, record, |
| 507 | pfrag, record_type); |
| 508 | if (rc) { |
| 509 | if (rc > 0) { |
| 510 | size += rc; |
| 511 | } else { |
| 512 | size = orig_size; |
| 513 | destroy_record(record); |
| 514 | ctx->open_record = NULL; |
| 515 | break; |
| 516 | } |
| 517 | } |
| 518 | |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 519 | rc = tls_push_record(sk, |
| 520 | tls_ctx, |
| 521 | ctx, |
| 522 | record, |
Jakub Kicinski | e7b159a | 2019-09-06 22:29:59 -0700 | [diff] [blame] | 523 | tls_push_record_flags); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 524 | if (rc < 0) |
| 525 | break; |
| 526 | } |
| 527 | } while (!done); |
| 528 | |
| 529 | if (orig_size - size > 0) |
| 530 | rc = orig_size - size; |
| 531 | |
| 532 | return rc; |
| 533 | } |
| 534 | |
| 535 | int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) |
| 536 | { |
| 537 | unsigned char record_type = TLS_RECORD_TYPE_DATA; |
Jakub Kicinski | 79ffe60 | 2019-11-05 14:24:35 -0800 | [diff] [blame] | 538 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 539 | int rc; |
| 540 | |
Jakub Kicinski | 79ffe60 | 2019-11-05 14:24:35 -0800 | [diff] [blame] | 541 | mutex_lock(&tls_ctx->tx_lock); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 542 | lock_sock(sk); |
| 543 | |
| 544 | if (unlikely(msg->msg_controllen)) { |
| 545 | rc = tls_proccess_cmsg(sk, msg, &record_type); |
| 546 | if (rc) |
| 547 | goto out; |
| 548 | } |
| 549 | |
| 550 | rc = tls_push_data(sk, &msg->msg_iter, size, |
| 551 | msg->msg_flags, record_type); |
| 552 | |
| 553 | out: |
| 554 | release_sock(sk); |
Jakub Kicinski | 79ffe60 | 2019-11-05 14:24:35 -0800 | [diff] [blame] | 555 | mutex_unlock(&tls_ctx->tx_lock); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 556 | return rc; |
| 557 | } |
| 558 | |
| 559 | int tls_device_sendpage(struct sock *sk, struct page *page, |
| 560 | int offset, size_t size, int flags) |
| 561 | { |
Jakub Kicinski | 79ffe60 | 2019-11-05 14:24:35 -0800 | [diff] [blame] | 562 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 563 | struct iov_iter msg_iter; |
| 564 | char *kaddr = kmap(page); |
| 565 | struct kvec iov; |
| 566 | int rc; |
| 567 | |
| 568 | if (flags & MSG_SENDPAGE_NOTLAST) |
| 569 | flags |= MSG_MORE; |
| 570 | |
Jakub Kicinski | 79ffe60 | 2019-11-05 14:24:35 -0800 | [diff] [blame] | 571 | mutex_lock(&tls_ctx->tx_lock); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 572 | lock_sock(sk); |
| 573 | |
| 574 | if (flags & MSG_OOB) { |
Valentin Vidic | 4a5cdc6 | 2019-12-05 07:41:18 +0100 | [diff] [blame] | 575 | rc = -EOPNOTSUPP; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 576 | goto out; |
| 577 | } |
| 578 | |
| 579 | iov.iov_base = kaddr + offset; |
| 580 | iov.iov_len = size; |
David Howells | aa563d7 | 2018-10-20 00:57:56 +0100 | [diff] [blame] | 581 | iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 582 | rc = tls_push_data(sk, &msg_iter, size, |
| 583 | flags, TLS_RECORD_TYPE_DATA); |
| 584 | kunmap(page); |
| 585 | |
| 586 | out: |
| 587 | release_sock(sk); |
Jakub Kicinski | 79ffe60 | 2019-11-05 14:24:35 -0800 | [diff] [blame] | 588 | mutex_unlock(&tls_ctx->tx_lock); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 589 | return rc; |
| 590 | } |
| 591 | |
Boris Pismenny | d80a1b9d | 2018-07-13 14:33:39 +0300 | [diff] [blame] | 592 | struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context, |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 593 | u32 seq, u64 *p_record_sn) |
| 594 | { |
| 595 | u64 record_sn = context->hint_record_sn; |
Rohit Maheshwari | 06f5201c | 2020-02-19 09:40:22 +0530 | [diff] [blame] | 596 | struct tls_record_info *info, *last; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 597 | |
| 598 | info = context->retransmit_hint; |
| 599 | if (!info || |
| 600 | before(seq, info->end_seq - info->len)) { |
| 601 | /* if retransmit_hint is irrelevant start |
| 602 | * from the beggining of the list |
| 603 | */ |
Jakub Kicinski | d4774ac | 2019-09-06 22:29:58 -0700 | [diff] [blame] | 604 | info = list_first_entry_or_null(&context->records_list, |
| 605 | struct tls_record_info, list); |
| 606 | if (!info) |
| 607 | return NULL; |
Rohit Maheshwari | 06f5201c | 2020-02-19 09:40:22 +0530 | [diff] [blame] | 608 | /* send the start_marker record if seq number is before the |
| 609 | * tls offload start marker sequence number. This record is |
| 610 | * required to handle TCP packets which are before TLS offload |
| 611 | * started. |
| 612 | * And if it's not start marker, look if this seq number |
| 613 | * belongs to the list. |
| 614 | */ |
| 615 | if (likely(!tls_record_is_start_marker(info))) { |
| 616 | /* we have the first record, get the last record to see |
| 617 | * if this seq number belongs to the list. |
| 618 | */ |
| 619 | last = list_last_entry(&context->records_list, |
| 620 | struct tls_record_info, list); |
| 621 | |
| 622 | if (!between(seq, tls_record_start_seq(info), |
| 623 | last->end_seq)) |
| 624 | return NULL; |
| 625 | } |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 626 | record_sn = context->unacked_record_sn; |
| 627 | } |
| 628 | |
Jakub Kicinski | d4774ac | 2019-09-06 22:29:58 -0700 | [diff] [blame] | 629 | /* We just need the _rcu for the READ_ONCE() */ |
| 630 | rcu_read_lock(); |
| 631 | list_for_each_entry_from_rcu(info, &context->records_list, list) { |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 632 | if (before(seq, info->end_seq)) { |
| 633 | if (!context->retransmit_hint || |
| 634 | after(info->end_seq, |
| 635 | context->retransmit_hint->end_seq)) { |
| 636 | context->hint_record_sn = record_sn; |
| 637 | context->retransmit_hint = info; |
| 638 | } |
| 639 | *p_record_sn = record_sn; |
Jakub Kicinski | d4774ac | 2019-09-06 22:29:58 -0700 | [diff] [blame] | 640 | goto exit_rcu_unlock; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 641 | } |
| 642 | record_sn++; |
| 643 | } |
Jakub Kicinski | d4774ac | 2019-09-06 22:29:58 -0700 | [diff] [blame] | 644 | info = NULL; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 645 | |
Jakub Kicinski | d4774ac | 2019-09-06 22:29:58 -0700 | [diff] [blame] | 646 | exit_rcu_unlock: |
| 647 | rcu_read_unlock(); |
| 648 | return info; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 649 | } |
| 650 | EXPORT_SYMBOL(tls_get_record); |
| 651 | |
| 652 | static int tls_device_push_pending_record(struct sock *sk, int flags) |
| 653 | { |
| 654 | struct iov_iter msg_iter; |
| 655 | |
David Howells | aa563d7 | 2018-10-20 00:57:56 +0100 | [diff] [blame] | 656 | iov_iter_kvec(&msg_iter, WRITE, NULL, 0, 0); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 657 | return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA); |
| 658 | } |
| 659 | |
Boris Pismenny | 7463d3a | 2019-02-27 17:38:04 +0200 | [diff] [blame] | 660 | void tls_device_write_space(struct sock *sk, struct tls_context *ctx) |
| 661 | { |
Jakub Kicinski | 02b1fa0 | 2019-11-05 14:24:34 -0800 | [diff] [blame] | 662 | if (tls_is_partially_sent_record(ctx)) { |
Boris Pismenny | 7463d3a | 2019-02-27 17:38:04 +0200 | [diff] [blame] | 663 | gfp_t sk_allocation = sk->sk_allocation; |
| 664 | |
Jakub Kicinski | 02b1fa0 | 2019-11-05 14:24:34 -0800 | [diff] [blame] | 665 | WARN_ON_ONCE(sk->sk_write_pending); |
| 666 | |
Boris Pismenny | 7463d3a | 2019-02-27 17:38:04 +0200 | [diff] [blame] | 667 | sk->sk_allocation = GFP_ATOMIC; |
Jakub Kicinski | 4147766 | 2019-08-07 17:03:59 -0700 | [diff] [blame] | 668 | tls_push_partial_record(sk, ctx, |
| 669 | MSG_DONTWAIT | MSG_NOSIGNAL | |
| 670 | MSG_SENDPAGE_DECRYPTED); |
Boris Pismenny | 7463d3a | 2019-02-27 17:38:04 +0200 | [diff] [blame] | 671 | sk->sk_allocation = sk_allocation; |
| 672 | } |
Boris Pismenny | 7463d3a | 2019-02-27 17:38:04 +0200 | [diff] [blame] | 673 | } |
| 674 | |
Jakub Kicinski | e52972c | 2019-06-04 12:00:12 -0700 | [diff] [blame] | 675 | static void tls_device_resync_rx(struct tls_context *tls_ctx, |
Jakub Kicinski | 89fec47 | 2019-06-10 21:40:00 -0700 | [diff] [blame] | 676 | struct sock *sk, u32 seq, u8 *rcd_sn) |
Jakub Kicinski | e52972c | 2019-06-04 12:00:12 -0700 | [diff] [blame] | 677 | { |
Jakub Kicinski | 8538d29 | 2019-10-04 16:19:22 -0700 | [diff] [blame] | 678 | struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx); |
Jakub Kicinski | e52972c | 2019-06-04 12:00:12 -0700 | [diff] [blame] | 679 | struct net_device *netdev; |
| 680 | |
| 681 | if (WARN_ON(test_and_set_bit(TLS_RX_SYNC_RUNNING, &tls_ctx->flags))) |
| 682 | return; |
Jakub Kicinski | 8538d29 | 2019-10-04 16:19:22 -0700 | [diff] [blame] | 683 | |
| 684 | trace_tls_device_rx_resync_send(sk, seq, rcd_sn, rx_ctx->resync_type); |
Jakub Kicinski | e52972c | 2019-06-04 12:00:12 -0700 | [diff] [blame] | 685 | netdev = READ_ONCE(tls_ctx->netdev); |
| 686 | if (netdev) |
Jakub Kicinski | eeb2efa | 2019-06-10 21:40:08 -0700 | [diff] [blame] | 687 | netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, rcd_sn, |
| 688 | TLS_OFFLOAD_CTX_DIR_RX); |
Jakub Kicinski | e52972c | 2019-06-04 12:00:12 -0700 | [diff] [blame] | 689 | clear_bit_unlock(TLS_RX_SYNC_RUNNING, &tls_ctx->flags); |
Jakub Kicinski | a4d26fd | 2019-10-04 16:19:27 -0700 | [diff] [blame] | 690 | TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICERESYNC); |
Jakub Kicinski | e52972c | 2019-06-04 12:00:12 -0700 | [diff] [blame] | 691 | } |
| 692 | |
Jakub Kicinski | f953d33b | 2019-06-10 21:40:02 -0700 | [diff] [blame] | 693 | void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 694 | { |
| 695 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 696 | struct tls_offload_context_rx *rx_ctx; |
Jakub Kicinski | f953d33b | 2019-06-10 21:40:02 -0700 | [diff] [blame] | 697 | u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE]; |
Jakub Kicinski | 8538d29 | 2019-10-04 16:19:22 -0700 | [diff] [blame] | 698 | u32 sock_data, is_req_pending; |
Jakub Kicinski | f953d33b | 2019-06-10 21:40:02 -0700 | [diff] [blame] | 699 | struct tls_prot_info *prot; |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 700 | s64 resync_req; |
| 701 | u32 req_seq; |
| 702 | |
| 703 | if (tls_ctx->rx_conf != TLS_HW) |
| 704 | return; |
| 705 | |
Jakub Kicinski | f953d33b | 2019-06-10 21:40:02 -0700 | [diff] [blame] | 706 | prot = &tls_ctx->prot_info; |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 707 | rx_ctx = tls_offload_ctx_rx(tls_ctx); |
Jakub Kicinski | f953d33b | 2019-06-10 21:40:02 -0700 | [diff] [blame] | 708 | memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size); |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 709 | |
Jakub Kicinski | f953d33b | 2019-06-10 21:40:02 -0700 | [diff] [blame] | 710 | switch (rx_ctx->resync_type) { |
| 711 | case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ: |
| 712 | resync_req = atomic64_read(&rx_ctx->resync_req); |
| 713 | req_seq = resync_req >> 32; |
| 714 | seq += TLS_HEADER_SIZE - 1; |
| 715 | is_req_pending = resync_req; |
| 716 | |
| 717 | if (likely(!is_req_pending) || req_seq != seq || |
| 718 | !atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0)) |
| 719 | return; |
| 720 | break; |
| 721 | case TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT: |
| 722 | if (likely(!rx_ctx->resync_nh_do_now)) |
| 723 | return; |
| 724 | |
| 725 | /* head of next rec is already in, note that the sock_inq will |
| 726 | * include the currently parsed message when called from parser |
| 727 | */ |
Jakub Kicinski | 8538d29 | 2019-10-04 16:19:22 -0700 | [diff] [blame] | 728 | sock_data = tcp_inq(sk); |
| 729 | if (sock_data > rcd_len) { |
| 730 | trace_tls_device_rx_resync_nh_delay(sk, sock_data, |
| 731 | rcd_len); |
Jakub Kicinski | f953d33b | 2019-06-10 21:40:02 -0700 | [diff] [blame] | 732 | return; |
Jakub Kicinski | 8538d29 | 2019-10-04 16:19:22 -0700 | [diff] [blame] | 733 | } |
Jakub Kicinski | f953d33b | 2019-06-10 21:40:02 -0700 | [diff] [blame] | 734 | |
| 735 | rx_ctx->resync_nh_do_now = 0; |
| 736 | seq += rcd_len; |
| 737 | tls_bigint_increment(rcd_sn, prot->rec_seq_size); |
| 738 | break; |
| 739 | } |
| 740 | |
| 741 | tls_device_resync_rx(tls_ctx, sk, seq, rcd_sn); |
| 742 | } |
| 743 | |
| 744 | static void tls_device_core_ctrl_rx_resync(struct tls_context *tls_ctx, |
| 745 | struct tls_offload_context_rx *ctx, |
| 746 | struct sock *sk, struct sk_buff *skb) |
| 747 | { |
| 748 | struct strp_msg *rxm; |
| 749 | |
| 750 | /* device will request resyncs by itself based on stream scan */ |
| 751 | if (ctx->resync_type != TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT) |
| 752 | return; |
| 753 | /* already scheduled */ |
| 754 | if (ctx->resync_nh_do_now) |
| 755 | return; |
| 756 | /* seen decrypted fragments since last fully-failed record */ |
| 757 | if (ctx->resync_nh_reset) { |
| 758 | ctx->resync_nh_reset = 0; |
| 759 | ctx->resync_nh.decrypted_failed = 1; |
| 760 | ctx->resync_nh.decrypted_tgt = TLS_DEVICE_RESYNC_NH_START_IVAL; |
| 761 | return; |
| 762 | } |
| 763 | |
| 764 | if (++ctx->resync_nh.decrypted_failed <= ctx->resync_nh.decrypted_tgt) |
| 765 | return; |
| 766 | |
| 767 | /* doing resync, bump the next target in case it fails */ |
| 768 | if (ctx->resync_nh.decrypted_tgt < TLS_DEVICE_RESYNC_NH_MAX_IVAL) |
| 769 | ctx->resync_nh.decrypted_tgt *= 2; |
| 770 | else |
| 771 | ctx->resync_nh.decrypted_tgt += TLS_DEVICE_RESYNC_NH_MAX_IVAL; |
| 772 | |
| 773 | rxm = strp_msg(skb); |
| 774 | |
| 775 | /* head of next rec is already in, parser will sync for us */ |
| 776 | if (tcp_inq(sk) > rxm->full_len) { |
Jakub Kicinski | 8538d29 | 2019-10-04 16:19:22 -0700 | [diff] [blame] | 777 | trace_tls_device_rx_resync_nh_schedule(sk); |
Jakub Kicinski | f953d33b | 2019-06-10 21:40:02 -0700 | [diff] [blame] | 778 | ctx->resync_nh_do_now = 1; |
| 779 | } else { |
| 780 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
| 781 | u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE]; |
| 782 | |
| 783 | memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size); |
| 784 | tls_bigint_increment(rcd_sn, prot->rec_seq_size); |
| 785 | |
| 786 | tls_device_resync_rx(tls_ctx, sk, tcp_sk(sk)->copied_seq, |
| 787 | rcd_sn); |
| 788 | } |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 789 | } |
| 790 | |
| 791 | static int tls_device_reencrypt(struct sock *sk, struct sk_buff *skb) |
| 792 | { |
| 793 | struct strp_msg *rxm = strp_msg(skb); |
Jakub Kicinski | eb3d38d | 2019-04-25 17:35:10 -0700 | [diff] [blame] | 794 | int err = 0, offset = rxm->offset, copy, nsg, data_len, pos; |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 795 | struct sk_buff *skb_iter, *unused; |
| 796 | struct scatterlist sg[1]; |
| 797 | char *orig_buf, *buf; |
| 798 | |
| 799 | orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE + |
| 800 | TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation); |
| 801 | if (!orig_buf) |
| 802 | return -ENOMEM; |
| 803 | buf = orig_buf; |
| 804 | |
| 805 | nsg = skb_cow_data(skb, 0, &unused); |
| 806 | if (unlikely(nsg < 0)) { |
| 807 | err = nsg; |
| 808 | goto free_buf; |
| 809 | } |
| 810 | |
| 811 | sg_init_table(sg, 1); |
| 812 | sg_set_buf(&sg[0], buf, |
| 813 | rxm->full_len + TLS_HEADER_SIZE + |
| 814 | TLS_CIPHER_AES_GCM_128_IV_SIZE); |
Jakub Kicinski | aeb11ff | 2019-06-03 15:16:59 -0700 | [diff] [blame] | 815 | err = skb_copy_bits(skb, offset, buf, |
| 816 | TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE); |
| 817 | if (err) |
| 818 | goto free_buf; |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 819 | |
| 820 | /* We are interested only in the decrypted data not the auth */ |
| 821 | err = decrypt_skb(sk, skb, sg); |
| 822 | if (err != -EBADMSG) |
| 823 | goto free_buf; |
| 824 | else |
| 825 | err = 0; |
| 826 | |
Jakub Kicinski | eb3d38d | 2019-04-25 17:35:10 -0700 | [diff] [blame] | 827 | data_len = rxm->full_len - TLS_CIPHER_AES_GCM_128_TAG_SIZE; |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 828 | |
Jakub Kicinski | 97e1caa | 2019-04-25 17:35:09 -0700 | [diff] [blame] | 829 | if (skb_pagelen(skb) > offset) { |
Jakub Kicinski | eb3d38d | 2019-04-25 17:35:10 -0700 | [diff] [blame] | 830 | copy = min_t(int, skb_pagelen(skb) - offset, data_len); |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 831 | |
Jakub Kicinski | aeb11ff | 2019-06-03 15:16:59 -0700 | [diff] [blame] | 832 | if (skb->decrypted) { |
| 833 | err = skb_store_bits(skb, offset, buf, copy); |
| 834 | if (err) |
| 835 | goto free_buf; |
| 836 | } |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 837 | |
| 838 | offset += copy; |
| 839 | buf += copy; |
| 840 | } |
| 841 | |
Jakub Kicinski | eb3d38d | 2019-04-25 17:35:10 -0700 | [diff] [blame] | 842 | pos = skb_pagelen(skb); |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 843 | skb_walk_frags(skb, skb_iter) { |
Jakub Kicinski | eb3d38d | 2019-04-25 17:35:10 -0700 | [diff] [blame] | 844 | int frag_pos; |
| 845 | |
| 846 | /* Practically all frags must belong to msg if reencrypt |
| 847 | * is needed with current strparser and coalescing logic, |
| 848 | * but strparser may "get optimized", so let's be safe. |
| 849 | */ |
| 850 | if (pos + skb_iter->len <= offset) |
| 851 | goto done_with_frag; |
| 852 | if (pos >= data_len + rxm->offset) |
| 853 | break; |
| 854 | |
| 855 | frag_pos = offset - pos; |
| 856 | copy = min_t(int, skb_iter->len - frag_pos, |
| 857 | data_len + rxm->offset - offset); |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 858 | |
Jakub Kicinski | aeb11ff | 2019-06-03 15:16:59 -0700 | [diff] [blame] | 859 | if (skb_iter->decrypted) { |
| 860 | err = skb_store_bits(skb_iter, frag_pos, buf, copy); |
| 861 | if (err) |
| 862 | goto free_buf; |
| 863 | } |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 864 | |
| 865 | offset += copy; |
| 866 | buf += copy; |
Jakub Kicinski | eb3d38d | 2019-04-25 17:35:10 -0700 | [diff] [blame] | 867 | done_with_frag: |
| 868 | pos += skb_iter->len; |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 869 | } |
| 870 | |
| 871 | free_buf: |
| 872 | kfree(orig_buf); |
| 873 | return err; |
| 874 | } |
| 875 | |
Jakub Kicinski | 4de30a8 | 2019-10-06 21:09:30 -0700 | [diff] [blame] | 876 | int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx, |
| 877 | struct sk_buff *skb, struct strp_msg *rxm) |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 878 | { |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 879 | struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx); |
| 880 | int is_decrypted = skb->decrypted; |
| 881 | int is_encrypted = !is_decrypted; |
| 882 | struct sk_buff *skb_iter; |
| 883 | |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 884 | /* Check if all the data is decrypted already */ |
| 885 | skb_walk_frags(skb, skb_iter) { |
| 886 | is_decrypted &= skb_iter->decrypted; |
| 887 | is_encrypted &= !skb_iter->decrypted; |
| 888 | } |
| 889 | |
Jakub Kicinski | 9ec1c6a | 2019-10-04 16:19:23 -0700 | [diff] [blame] | 890 | trace_tls_device_decrypted(sk, tcp_sk(sk)->copied_seq - rxm->full_len, |
| 891 | tls_ctx->rx.rec_seq, rxm->full_len, |
| 892 | is_encrypted, is_decrypted); |
| 893 | |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 894 | ctx->sw.decrypted |= is_decrypted; |
| 895 | |
Jakub Kicinski | f953d33b | 2019-06-10 21:40:02 -0700 | [diff] [blame] | 896 | /* Return immediately if the record is either entirely plaintext or |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 897 | * entirely ciphertext. Otherwise handle reencrypt partially decrypted |
| 898 | * record. |
| 899 | */ |
Jakub Kicinski | f953d33b | 2019-06-10 21:40:02 -0700 | [diff] [blame] | 900 | if (is_decrypted) { |
| 901 | ctx->resync_nh_reset = 1; |
| 902 | return 0; |
| 903 | } |
| 904 | if (is_encrypted) { |
| 905 | tls_device_core_ctrl_rx_resync(tls_ctx, ctx, sk, skb); |
| 906 | return 0; |
| 907 | } |
| 908 | |
| 909 | ctx->resync_nh_reset = 1; |
| 910 | return tls_device_reencrypt(sk, skb); |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 911 | } |
| 912 | |
Jakub Kicinski | 9e99579 | 2019-04-25 12:32:02 -0700 | [diff] [blame] | 913 | static void tls_device_attach(struct tls_context *ctx, struct sock *sk, |
| 914 | struct net_device *netdev) |
| 915 | { |
| 916 | if (sk->sk_destruct != tls_device_sk_destruct) { |
| 917 | refcount_set(&ctx->refcount, 1); |
| 918 | dev_hold(netdev); |
| 919 | ctx->netdev = netdev; |
| 920 | spin_lock_irq(&tls_device_lock); |
| 921 | list_add_tail(&ctx->list, &tls_device_list); |
| 922 | spin_unlock_irq(&tls_device_lock); |
| 923 | |
| 924 | ctx->sk_destruct = sk->sk_destruct; |
Jakub Kicinski | 8d5a49e | 2019-12-17 14:12:01 -0800 | [diff] [blame] | 925 | smp_store_release(&sk->sk_destruct, tls_device_sk_destruct); |
Jakub Kicinski | 9e99579 | 2019-04-25 12:32:02 -0700 | [diff] [blame] | 926 | } |
| 927 | } |
| 928 | |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 929 | int tls_set_device_offload(struct sock *sk, struct tls_context *ctx) |
| 930 | { |
| 931 | u16 nonce_size, tag_size, iv_size, rec_seq_size; |
Vakul Garg | 4509de1 | 2019-02-14 07:11:35 +0000 | [diff] [blame] | 932 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
| 933 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 934 | struct tls_record_info *start_marker_record; |
Boris Pismenny | d80a1b9d | 2018-07-13 14:33:39 +0300 | [diff] [blame] | 935 | struct tls_offload_context_tx *offload_ctx; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 936 | struct tls_crypto_info *crypto_info; |
| 937 | struct net_device *netdev; |
| 938 | char *iv, *rec_seq; |
| 939 | struct sk_buff *skb; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 940 | __be64 rcd_sn; |
Jakub Kicinski | 90962b4 | 2019-09-02 21:31:03 -0700 | [diff] [blame] | 941 | int rc; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 942 | |
| 943 | if (!ctx) |
Jakub Kicinski | 90962b4 | 2019-09-02 21:31:03 -0700 | [diff] [blame] | 944 | return -EINVAL; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 945 | |
Jakub Kicinski | 90962b4 | 2019-09-02 21:31:03 -0700 | [diff] [blame] | 946 | if (ctx->priv_ctx_tx) |
| 947 | return -EEXIST; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 948 | |
| 949 | start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL); |
Jakub Kicinski | 90962b4 | 2019-09-02 21:31:03 -0700 | [diff] [blame] | 950 | if (!start_marker_record) |
| 951 | return -ENOMEM; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 952 | |
Boris Pismenny | d80a1b9d | 2018-07-13 14:33:39 +0300 | [diff] [blame] | 953 | offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 954 | if (!offload_ctx) { |
| 955 | rc = -ENOMEM; |
| 956 | goto free_marker_record; |
| 957 | } |
| 958 | |
Sabrina Dubroca | 86029d1 | 2018-09-12 17:44:42 +0200 | [diff] [blame] | 959 | crypto_info = &ctx->crypto_send.info; |
Jakub Kicinski | 618bac4 | 2019-06-28 16:07:59 -0700 | [diff] [blame] | 960 | if (crypto_info->version != TLS_1_2_VERSION) { |
| 961 | rc = -EOPNOTSUPP; |
| 962 | goto free_offload_ctx; |
| 963 | } |
| 964 | |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 965 | switch (crypto_info->cipher_type) { |
| 966 | case TLS_CIPHER_AES_GCM_128: |
| 967 | nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; |
| 968 | tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE; |
| 969 | iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; |
| 970 | iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv; |
| 971 | rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE; |
| 972 | rec_seq = |
| 973 | ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq; |
| 974 | break; |
| 975 | default: |
| 976 | rc = -EINVAL; |
| 977 | goto free_offload_ctx; |
| 978 | } |
| 979 | |
Jakub Kicinski | 89fec47 | 2019-06-10 21:40:00 -0700 | [diff] [blame] | 980 | /* Sanity-check the rec_seq_size for stack allocations */ |
| 981 | if (rec_seq_size > TLS_MAX_REC_SEQ_SIZE) { |
| 982 | rc = -EINVAL; |
| 983 | goto free_offload_ctx; |
| 984 | } |
| 985 | |
Jakub Kicinski | ab232e6 | 2019-07-08 19:53:15 -0700 | [diff] [blame] | 986 | prot->version = crypto_info->version; |
| 987 | prot->cipher_type = crypto_info->cipher_type; |
Vakul Garg | 4509de1 | 2019-02-14 07:11:35 +0000 | [diff] [blame] | 988 | prot->prepend_size = TLS_HEADER_SIZE + nonce_size; |
| 989 | prot->tag_size = tag_size; |
| 990 | prot->overhead_size = prot->prepend_size + prot->tag_size; |
| 991 | prot->iv_size = iv_size; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 992 | ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE, |
| 993 | GFP_KERNEL); |
| 994 | if (!ctx->tx.iv) { |
| 995 | rc = -ENOMEM; |
| 996 | goto free_offload_ctx; |
| 997 | } |
| 998 | |
| 999 | memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size); |
| 1000 | |
Vakul Garg | 4509de1 | 2019-02-14 07:11:35 +0000 | [diff] [blame] | 1001 | prot->rec_seq_size = rec_seq_size; |
zhong jiang | 969d509 | 2018-08-01 00:50:24 +0800 | [diff] [blame] | 1002 | ctx->tx.rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1003 | if (!ctx->tx.rec_seq) { |
| 1004 | rc = -ENOMEM; |
| 1005 | goto free_iv; |
| 1006 | } |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1007 | |
| 1008 | rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info); |
| 1009 | if (rc) |
| 1010 | goto free_rec_seq; |
| 1011 | |
| 1012 | /* start at rec_seq - 1 to account for the start marker record */ |
| 1013 | memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn)); |
| 1014 | offload_ctx->unacked_record_sn = be64_to_cpu(rcd_sn) - 1; |
| 1015 | |
| 1016 | start_marker_record->end_seq = tcp_sk(sk)->write_seq; |
| 1017 | start_marker_record->len = 0; |
| 1018 | start_marker_record->num_frags = 0; |
| 1019 | |
| 1020 | INIT_LIST_HEAD(&offload_ctx->records_list); |
| 1021 | list_add_tail(&start_marker_record->list, &offload_ctx->records_list); |
| 1022 | spin_lock_init(&offload_ctx->lock); |
Boris Pismenny | 895262d | 2018-05-10 16:27:25 +0300 | [diff] [blame] | 1023 | sg_init_table(offload_ctx->sg_tx_data, |
| 1024 | ARRAY_SIZE(offload_ctx->sg_tx_data)); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1025 | |
| 1026 | clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked); |
| 1027 | ctx->push_pending_record = tls_device_push_pending_record; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1028 | |
| 1029 | /* TLS offload is greatly simplified if we don't send |
| 1030 | * SKBs where only part of the payload needs to be encrypted. |
| 1031 | * So mark the last skb in the write queue as end of record. |
| 1032 | */ |
| 1033 | skb = tcp_write_queue_tail(sk); |
| 1034 | if (skb) |
| 1035 | TCP_SKB_CB(skb)->eor = 1; |
| 1036 | |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1037 | netdev = get_netdev_for_sock(sk); |
| 1038 | if (!netdev) { |
| 1039 | pr_err_ratelimited("%s: netdev not found\n", __func__); |
| 1040 | rc = -EINVAL; |
Jakub Kicinski | 3544c98a | 2019-09-02 21:31:04 -0700 | [diff] [blame] | 1041 | goto disable_cad; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1042 | } |
| 1043 | |
| 1044 | if (!(netdev->features & NETIF_F_HW_TLS_TX)) { |
Valentin Vidic | 4a5cdc6 | 2019-12-05 07:41:18 +0100 | [diff] [blame] | 1045 | rc = -EOPNOTSUPP; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1046 | goto release_netdev; |
| 1047 | } |
| 1048 | |
| 1049 | /* Avoid offloading if the device is down |
| 1050 | * We don't want to offload new flows after |
| 1051 | * the NETDEV_DOWN event |
Jakub Kicinski | 3544c98a | 2019-09-02 21:31:04 -0700 | [diff] [blame] | 1052 | * |
| 1053 | * device_offload_lock is taken in tls_devices's NETDEV_DOWN |
| 1054 | * handler thus protecting from the device going down before |
| 1055 | * ctx was added to tls_device_list. |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1056 | */ |
Jakub Kicinski | 3544c98a | 2019-09-02 21:31:04 -0700 | [diff] [blame] | 1057 | down_read(&device_offload_lock); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1058 | if (!(netdev->flags & IFF_UP)) { |
| 1059 | rc = -EINVAL; |
Jakub Kicinski | 3544c98a | 2019-09-02 21:31:04 -0700 | [diff] [blame] | 1060 | goto release_lock; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1061 | } |
| 1062 | |
| 1063 | ctx->priv_ctx_tx = offload_ctx; |
| 1064 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX, |
Sabrina Dubroca | 86029d1 | 2018-09-12 17:44:42 +0200 | [diff] [blame] | 1065 | &ctx->crypto_send.info, |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1066 | tcp_sk(sk)->write_seq); |
Jakub Kicinski | 8538d29 | 2019-10-04 16:19:22 -0700 | [diff] [blame] | 1067 | trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_TX, |
| 1068 | tcp_sk(sk)->write_seq, rec_seq, rc); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1069 | if (rc) |
Jakub Kicinski | 3544c98a | 2019-09-02 21:31:04 -0700 | [diff] [blame] | 1070 | goto release_lock; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1071 | |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1072 | tls_device_attach(ctx, sk, netdev); |
Jakub Kicinski | 3544c98a | 2019-09-02 21:31:04 -0700 | [diff] [blame] | 1073 | up_read(&device_offload_lock); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1074 | |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1075 | /* following this assignment tls_is_sk_tx_device_offloaded |
| 1076 | * will return true and the context might be accessed |
| 1077 | * by the netdev's xmit function. |
| 1078 | */ |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1079 | smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb); |
| 1080 | dev_put(netdev); |
Jakub Kicinski | 90962b4 | 2019-09-02 21:31:03 -0700 | [diff] [blame] | 1081 | |
| 1082 | return 0; |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1083 | |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1084 | release_lock: |
| 1085 | up_read(&device_offload_lock); |
Jakub Kicinski | 3544c98a | 2019-09-02 21:31:04 -0700 | [diff] [blame] | 1086 | release_netdev: |
| 1087 | dev_put(netdev); |
| 1088 | disable_cad: |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1089 | clean_acked_data_disable(inet_csk(sk)); |
| 1090 | crypto_free_aead(offload_ctx->aead_send); |
| 1091 | free_rec_seq: |
| 1092 | kfree(ctx->tx.rec_seq); |
| 1093 | free_iv: |
| 1094 | kfree(ctx->tx.iv); |
| 1095 | free_offload_ctx: |
| 1096 | kfree(offload_ctx); |
| 1097 | ctx->priv_ctx_tx = NULL; |
| 1098 | free_marker_record: |
| 1099 | kfree(start_marker_record); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1100 | return rc; |
| 1101 | } |
| 1102 | |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1103 | int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx) |
| 1104 | { |
Jakub Kicinski | 8538d29 | 2019-10-04 16:19:22 -0700 | [diff] [blame] | 1105 | struct tls12_crypto_info_aes_gcm_128 *info; |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1106 | struct tls_offload_context_rx *context; |
| 1107 | struct net_device *netdev; |
| 1108 | int rc = 0; |
| 1109 | |
Jakub Kicinski | 618bac4 | 2019-06-28 16:07:59 -0700 | [diff] [blame] | 1110 | if (ctx->crypto_recv.info.version != TLS_1_2_VERSION) |
| 1111 | return -EOPNOTSUPP; |
| 1112 | |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1113 | netdev = get_netdev_for_sock(sk); |
| 1114 | if (!netdev) { |
| 1115 | pr_err_ratelimited("%s: netdev not found\n", __func__); |
Jakub Kicinski | 3544c98a | 2019-09-02 21:31:04 -0700 | [diff] [blame] | 1116 | return -EINVAL; |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1117 | } |
| 1118 | |
| 1119 | if (!(netdev->features & NETIF_F_HW_TLS_RX)) { |
Valentin Vidic | 4a5cdc6 | 2019-12-05 07:41:18 +0100 | [diff] [blame] | 1120 | rc = -EOPNOTSUPP; |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1121 | goto release_netdev; |
| 1122 | } |
| 1123 | |
| 1124 | /* Avoid offloading if the device is down |
| 1125 | * We don't want to offload new flows after |
| 1126 | * the NETDEV_DOWN event |
Jakub Kicinski | 3544c98a | 2019-09-02 21:31:04 -0700 | [diff] [blame] | 1127 | * |
| 1128 | * device_offload_lock is taken in tls_devices's NETDEV_DOWN |
| 1129 | * handler thus protecting from the device going down before |
| 1130 | * ctx was added to tls_device_list. |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1131 | */ |
Jakub Kicinski | 3544c98a | 2019-09-02 21:31:04 -0700 | [diff] [blame] | 1132 | down_read(&device_offload_lock); |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1133 | if (!(netdev->flags & IFF_UP)) { |
| 1134 | rc = -EINVAL; |
Jakub Kicinski | 3544c98a | 2019-09-02 21:31:04 -0700 | [diff] [blame] | 1135 | goto release_lock; |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1136 | } |
| 1137 | |
| 1138 | context = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_RX, GFP_KERNEL); |
| 1139 | if (!context) { |
| 1140 | rc = -ENOMEM; |
Jakub Kicinski | 3544c98a | 2019-09-02 21:31:04 -0700 | [diff] [blame] | 1141 | goto release_lock; |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1142 | } |
Jakub Kicinski | f953d33b | 2019-06-10 21:40:02 -0700 | [diff] [blame] | 1143 | context->resync_nh_reset = 1; |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1144 | |
| 1145 | ctx->priv_ctx_rx = context; |
| 1146 | rc = tls_set_sw_offload(sk, ctx, 0); |
| 1147 | if (rc) |
| 1148 | goto release_ctx; |
| 1149 | |
| 1150 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX, |
Sabrina Dubroca | 86029d1 | 2018-09-12 17:44:42 +0200 | [diff] [blame] | 1151 | &ctx->crypto_recv.info, |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1152 | tcp_sk(sk)->copied_seq); |
Jakub Kicinski | 8538d29 | 2019-10-04 16:19:22 -0700 | [diff] [blame] | 1153 | info = (void *)&ctx->crypto_recv.info; |
| 1154 | trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_RX, |
| 1155 | tcp_sk(sk)->copied_seq, info->rec_seq, rc); |
Jakub Kicinski | e49d268d | 2019-04-25 12:32:01 -0700 | [diff] [blame] | 1156 | if (rc) |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1157 | goto free_sw_resources; |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1158 | |
| 1159 | tls_device_attach(ctx, sk, netdev); |
Jakub Kicinski | 90962b4 | 2019-09-02 21:31:03 -0700 | [diff] [blame] | 1160 | up_read(&device_offload_lock); |
| 1161 | |
| 1162 | dev_put(netdev); |
| 1163 | |
| 1164 | return 0; |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1165 | |
| 1166 | free_sw_resources: |
Jakub Kicinski | 62ef81d | 2019-04-19 16:51:38 -0700 | [diff] [blame] | 1167 | up_read(&device_offload_lock); |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1168 | tls_sw_free_resources_rx(sk); |
Jakub Kicinski | 62ef81d | 2019-04-19 16:51:38 -0700 | [diff] [blame] | 1169 | down_read(&device_offload_lock); |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1170 | release_ctx: |
| 1171 | ctx->priv_ctx_rx = NULL; |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1172 | release_lock: |
| 1173 | up_read(&device_offload_lock); |
Jakub Kicinski | 3544c98a | 2019-09-02 21:31:04 -0700 | [diff] [blame] | 1174 | release_netdev: |
| 1175 | dev_put(netdev); |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1176 | return rc; |
| 1177 | } |
| 1178 | |
| 1179 | void tls_device_offload_cleanup_rx(struct sock *sk) |
| 1180 | { |
| 1181 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
| 1182 | struct net_device *netdev; |
| 1183 | |
| 1184 | down_read(&device_offload_lock); |
| 1185 | netdev = tls_ctx->netdev; |
| 1186 | if (!netdev) |
| 1187 | goto out; |
| 1188 | |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1189 | netdev->tlsdev_ops->tls_dev_del(netdev, tls_ctx, |
| 1190 | TLS_OFFLOAD_CTX_DIR_RX); |
| 1191 | |
| 1192 | if (tls_ctx->tx_conf != TLS_HW) { |
| 1193 | dev_put(netdev); |
| 1194 | tls_ctx->netdev = NULL; |
| 1195 | } |
| 1196 | out: |
| 1197 | up_read(&device_offload_lock); |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1198 | tls_sw_release_resources_rx(sk); |
| 1199 | } |
| 1200 | |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1201 | static int tls_device_down(struct net_device *netdev) |
| 1202 | { |
| 1203 | struct tls_context *ctx, *tmp; |
| 1204 | unsigned long flags; |
| 1205 | LIST_HEAD(list); |
| 1206 | |
| 1207 | /* Request a write lock to block new offload attempts */ |
| 1208 | down_write(&device_offload_lock); |
| 1209 | |
| 1210 | spin_lock_irqsave(&tls_device_lock, flags); |
| 1211 | list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) { |
| 1212 | if (ctx->netdev != netdev || |
| 1213 | !refcount_inc_not_zero(&ctx->refcount)) |
| 1214 | continue; |
| 1215 | |
| 1216 | list_move(&ctx->list, &list); |
| 1217 | } |
| 1218 | spin_unlock_irqrestore(&tls_device_lock, flags); |
| 1219 | |
| 1220 | list_for_each_entry_safe(ctx, tmp, &list, list) { |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1221 | if (ctx->tx_conf == TLS_HW) |
| 1222 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, |
| 1223 | TLS_OFFLOAD_CTX_DIR_TX); |
| 1224 | if (ctx->rx_conf == TLS_HW) |
| 1225 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, |
| 1226 | TLS_OFFLOAD_CTX_DIR_RX); |
Jakub Kicinski | e52972c | 2019-06-04 12:00:12 -0700 | [diff] [blame] | 1227 | WRITE_ONCE(ctx->netdev, NULL); |
| 1228 | smp_mb__before_atomic(); /* pairs with test_and_set_bit() */ |
| 1229 | while (test_bit(TLS_RX_SYNC_RUNNING, &ctx->flags)) |
| 1230 | usleep_range(10, 200); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1231 | dev_put(netdev); |
| 1232 | list_del_init(&ctx->list); |
| 1233 | |
| 1234 | if (refcount_dec_and_test(&ctx->refcount)) |
| 1235 | tls_device_free_ctx(ctx); |
| 1236 | } |
| 1237 | |
| 1238 | up_write(&device_offload_lock); |
| 1239 | |
| 1240 | flush_work(&tls_device_gc_work); |
| 1241 | |
| 1242 | return NOTIFY_DONE; |
| 1243 | } |
| 1244 | |
| 1245 | static int tls_dev_event(struct notifier_block *this, unsigned long event, |
| 1246 | void *ptr) |
| 1247 | { |
| 1248 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| 1249 | |
Jakub Kicinski | c3f4a6c | 2019-05-21 19:02:02 -0700 | [diff] [blame] | 1250 | if (!dev->tlsdev_ops && |
| 1251 | !(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX))) |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1252 | return NOTIFY_DONE; |
| 1253 | |
| 1254 | switch (event) { |
| 1255 | case NETDEV_REGISTER: |
| 1256 | case NETDEV_FEAT_CHANGE: |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1257 | if ((dev->features & NETIF_F_HW_TLS_RX) && |
Jakub Kicinski | eeb2efa | 2019-06-10 21:40:08 -0700 | [diff] [blame] | 1258 | !dev->tlsdev_ops->tls_dev_resync) |
Boris Pismenny | 4799ac8 | 2018-07-13 14:33:43 +0300 | [diff] [blame] | 1259 | return NOTIFY_BAD; |
| 1260 | |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1261 | if (dev->tlsdev_ops && |
| 1262 | dev->tlsdev_ops->tls_dev_add && |
| 1263 | dev->tlsdev_ops->tls_dev_del) |
| 1264 | return NOTIFY_DONE; |
| 1265 | else |
| 1266 | return NOTIFY_BAD; |
| 1267 | case NETDEV_DOWN: |
| 1268 | return tls_device_down(dev); |
| 1269 | } |
| 1270 | return NOTIFY_DONE; |
| 1271 | } |
| 1272 | |
| 1273 | static struct notifier_block tls_dev_notifier = { |
| 1274 | .notifier_call = tls_dev_event, |
| 1275 | }; |
| 1276 | |
| 1277 | void __init tls_device_init(void) |
| 1278 | { |
| 1279 | register_netdevice_notifier(&tls_dev_notifier); |
| 1280 | } |
| 1281 | |
| 1282 | void __exit tls_device_cleanup(void) |
| 1283 | { |
| 1284 | unregister_netdevice_notifier(&tls_dev_notifier); |
| 1285 | flush_work(&tls_device_gc_work); |
Jakub Kicinski | 494bc1d | 2019-05-08 16:46:14 -0700 | [diff] [blame] | 1286 | clean_acked_data_flush(); |
Ilya Lesokhin | e8f6979 | 2018-04-30 10:16:16 +0300 | [diff] [blame] | 1287 | } |