1 /*
2 * Copyright (c) 2018 Chelsio Communications, Inc.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9 #ifndef __CHTLS_H__
10 #define __CHTLS_H__
11
12 #include <crypto/aes.h>
13 #include <crypto/algapi.h>
14 #include <crypto/hash.h>
15 #include <crypto/sha.h>
16 #include <crypto/authenc.h>
17 #include <crypto/ctr.h>
18 #include <crypto/gf128mul.h>
19 #include <crypto/internal/aead.h>
20 #include <crypto/null.h>
21 #include <crypto/internal/skcipher.h>
22 #include <crypto/aead.h>
23 #include <crypto/scatterwalk.h>
24 #include <crypto/internal/hash.h>
25 #include <linux/tls.h>
26 #include <net/tls.h>
27
28 #include "t4fw_api.h"
29 #include "t4_msg.h"
30 #include "cxgb4.h"
31 #include "cxgb4_uld.h"
32 #include "l2t.h"
33 #include "chcr_algo.h"
34 #include "chcr_core.h"
35 #include "chcr_crypto.h"
36
37 #define MAX_IVS_PAGE 256
38 #define TLS_KEY_CONTEXT_SZ 64
39 #define CIPHER_BLOCK_SIZE 16
40 #define GCM_TAG_SIZE 16
41 #define KEY_ON_MEM_SZ 16
42 #define AEAD_EXPLICIT_DATA_SIZE 8
43 #define TLS_HEADER_LENGTH 5
44 #define SCMD_CIPH_MODE_AES_GCM 2
45 /* Any MFS size should work and come from openssl */
46 #define TLS_MFS 16384
47
48 #define RSS_HDR sizeof(struct rss_header)
49 #define TLS_WR_CPL_LEN \
50 (sizeof(struct fw_tlstx_data_wr) + sizeof(struct cpl_tx_tls_sfo))
51
52 enum {
53 CHTLS_KEY_CONTEXT_DSGL,
54 CHTLS_KEY_CONTEXT_IMM,
55 CHTLS_KEY_CONTEXT_DDR,
56 };
57
58 enum {
59 CHTLS_LISTEN_START,
60 CHTLS_LISTEN_STOP,
61 };
62
63 /* Flags for return value of CPL message handlers */
64 enum {
65 CPL_RET_BUF_DONE = 1, /* buffer processing done */
66 CPL_RET_BAD_MSG = 2, /* bad CPL message */
67 CPL_RET_UNKNOWN_TID = 4 /* unexpected unknown TID */
68 };
69
70 #define LISTEN_INFO_HASH_SIZE 32
71 #define RSPQ_HASH_BITS 5
72 struct listen_info {
73 struct listen_info *next; /* Link to next entry */
74 struct sock *sk; /* The listening socket */
75 unsigned int stid; /* The server TID */
76 };
77
78 enum {
79 T4_LISTEN_START_PENDING,
80 T4_LISTEN_STARTED
81 };
82
83 enum csk_flags {
84 CSK_CALLBACKS_CHKD, /* socket callbacks have been sanitized */
85 CSK_ABORT_REQ_RCVD, /* received one ABORT_REQ_RSS message */
86 CSK_TX_MORE_DATA, /* sending ULP data; don't set SHOVE bit */
87 CSK_TX_WAIT_IDLE, /* suspend Tx until in-flight data is ACKed */
88 CSK_ABORT_SHUTDOWN, /* shouldn't send more abort requests */
89 CSK_ABORT_RPL_PENDING, /* expecting an abort reply */
90 CSK_CLOSE_CON_REQUESTED,/* we've sent a close_conn_req */
91 CSK_TX_DATA_SENT, /* sent a TX_DATA WR on this connection */
92 CSK_TX_FAILOVER, /* Tx traffic failing over */
93 CSK_UPDATE_RCV_WND, /* Need to update rcv window */
94 CSK_RST_ABORTED, /* outgoing RST was aborted */
95 CSK_TLS_HANDSHK, /* TLS Handshake */
96 CSK_CONN_INLINE, /* Connection on HW */
97 };
98
99 enum chtls_cdev_state {
100 CHTLS_CDEV_STATE_UP = 1
101 };
102
103 struct listen_ctx {
104 struct sock *lsk;
105 struct chtls_dev *cdev;
106 struct sk_buff_head synq;
107 u32 state;
108 };
109
110 struct key_map {
111 unsigned long *addr;
112 unsigned int start;
113 unsigned int available;
114 unsigned int size;
115 spinlock_t lock; /* lock for key id request from map */
116 } __packed;
117
118 struct tls_scmd {
119 u32 seqno_numivs;
120 u32 ivgen_hdrlen;
121 };
122
123 struct chtls_dev {
124 struct tls_device tlsdev;
125 struct list_head list;
126 struct cxgb4_lld_info *lldi;
127 struct pci_dev *pdev;
128 struct listen_info *listen_hash_tab[LISTEN_INFO_HASH_SIZE];
129 spinlock_t listen_lock; /* lock for listen list */
130 struct net_device **ports;
131 struct tid_info *tids;
132 unsigned int pfvf;
133 const unsigned short *mtus;
134
135 struct idr hwtid_idr;
136 struct idr stid_idr;
137
138 spinlock_t idr_lock ____cacheline_aligned_in_smp;
139
140 struct net_device *egr_dev[NCHAN * 2];
141 struct sk_buff *rspq_skb_cache[1 << RSPQ_HASH_BITS];
142 struct sk_buff *askb;
143
144 struct sk_buff_head deferq;
145 struct work_struct deferq_task;
146
147 struct list_head list_node;
148 struct list_head rcu_node;
149 struct list_head na_node;
150 unsigned int send_page_order;
151 int max_host_sndbuf;
152 struct key_map kmap;
153 unsigned int cdev_state;
154 };
155
156 struct chtls_hws {
157 struct sk_buff_head sk_recv_queue;
158 u8 txqid;
159 u8 ofld;
160 u16 type;
161 u16 rstate;
162 u16 keyrpl;
163 u16 pldlen;
164 u16 rcvpld;
165 u16 compute;
166 u16 expansion;
167 u16 keylen;
168 u16 pdus;
169 u16 adjustlen;
170 u16 ivsize;
171 u16 txleft;
172 u32 mfs;
173 s32 txkey;
174 s32 rxkey;
175 u32 fcplenmax;
176 u32 copied_seq;
177 u64 tx_seq_no;
178 struct tls_scmd scmd;
179 struct tls12_crypto_info_aes_gcm_128 crypto_info;
180 };
181
182 struct chtls_sock {
183 struct sock *sk;
184 struct chtls_dev *cdev;
185 struct l2t_entry *l2t_entry; /* pointer to the L2T entry */
186 struct net_device *egress_dev; /* TX_CHAN for act open retry */
187
188 struct sk_buff_head txq;
189 struct sk_buff *wr_skb_head;
190 struct sk_buff *wr_skb_tail;
191 struct sk_buff *ctrl_skb_cache;
192 struct sk_buff *txdata_skb_cache; /* abort path messages */
193 struct kref kref;
194 unsigned long flags;
195 u32 opt2;
196 u32 wr_credits;
197 u32 wr_unacked;
198 u32 wr_max_credits;
199 u32 wr_nondata;
200 u32 hwtid; /* TCP Control Block ID */
201 u32 txq_idx;
202 u32 rss_qid;
203 u32 tid;
204 u32 idr;
205 u32 mss;
206 u32 ulp_mode;
207 u32 tx_chan;
208 u32 rx_chan;
209 u32 sndbuf;
210 u32 txplen_max;
211 u32 mtu_idx; /* MTU table index */
212 u32 smac_idx;
213 u8 port_id;
214 u8 tos;
215 u16 resv2;
216 u32 delack_mode;
217 u32 delack_seq;
218
219 void *passive_reap_next; /* placeholder for passive */
220 struct chtls_hws tlshws;
221 struct synq {
222 struct sk_buff *next;
223 struct sk_buff *prev;
224 } synq;
225 struct listen_ctx *listen_ctx;
226 };
227
228 struct tls_hdr {
229 u8 type;
230 u16 version;
231 u16 length;
232 } __packed;
233
234 struct tlsrx_cmp_hdr {
235 u8 type;
236 u16 version;
237 u16 length;
238
239 u64 tls_seq;
240 u16 reserved1;
241 u8 res_to_mac_error;
242 } __packed;
243
244 /* res_to_mac_error fields */
245 #define TLSRX_HDR_PKT_INT_ERROR_S 4
246 #define TLSRX_HDR_PKT_INT_ERROR_M 0x1
247 #define TLSRX_HDR_PKT_INT_ERROR_V(x) \
248 ((x) << TLSRX_HDR_PKT_INT_ERROR_S)
249 #define TLSRX_HDR_PKT_INT_ERROR_G(x) \
250 (((x) >> TLSRX_HDR_PKT_INT_ERROR_S) & TLSRX_HDR_PKT_INT_ERROR_M)
251 #define TLSRX_HDR_PKT_INT_ERROR_F TLSRX_HDR_PKT_INT_ERROR_V(1U)
252
253 #define TLSRX_HDR_PKT_SPP_ERROR_S 3
254 #define TLSRX_HDR_PKT_SPP_ERROR_M 0x1
255 #define TLSRX_HDR_PKT_SPP_ERROR_V(x) ((x) << TLSRX_HDR_PKT_SPP_ERROR)
256 #define TLSRX_HDR_PKT_SPP_ERROR_G(x) \
257 (((x) >> TLSRX_HDR_PKT_SPP_ERROR_S) & TLSRX_HDR_PKT_SPP_ERROR_M)
258 #define TLSRX_HDR_PKT_SPP_ERROR_F TLSRX_HDR_PKT_SPP_ERROR_V(1U)
259
260 #define TLSRX_HDR_PKT_CCDX_ERROR_S 2
261 #define TLSRX_HDR_PKT_CCDX_ERROR_M 0x1
262 #define TLSRX_HDR_PKT_CCDX_ERROR_V(x) ((x) << TLSRX_HDR_PKT_CCDX_ERROR_S)
263 #define TLSRX_HDR_PKT_CCDX_ERROR_G(x) \
264 (((x) >> TLSRX_HDR_PKT_CCDX_ERROR_S) & TLSRX_HDR_PKT_CCDX_ERROR_M)
265 #define TLSRX_HDR_PKT_CCDX_ERROR_F TLSRX_HDR_PKT_CCDX_ERROR_V(1U)
266
267 #define TLSRX_HDR_PKT_PAD_ERROR_S 1
268 #define TLSRX_HDR_PKT_PAD_ERROR_M 0x1
269 #define TLSRX_HDR_PKT_PAD_ERROR_V(x) ((x) << TLSRX_HDR_PKT_PAD_ERROR_S)
270 #define TLSRX_HDR_PKT_PAD_ERROR_G(x) \
271 (((x) >> TLSRX_HDR_PKT_PAD_ERROR_S) & TLSRX_HDR_PKT_PAD_ERROR_M)
272 #define TLSRX_HDR_PKT_PAD_ERROR_F TLSRX_HDR_PKT_PAD_ERROR_V(1U)
273
274 #define TLSRX_HDR_PKT_MAC_ERROR_S 0
275 #define TLSRX_HDR_PKT_MAC_ERROR_M 0x1
276 #define TLSRX_HDR_PKT_MAC_ERROR_V(x) ((x) << TLSRX_HDR_PKT_MAC_ERROR)
277 #define TLSRX_HDR_PKT_MAC_ERROR_G(x) \
278 (((x) >> S_TLSRX_HDR_PKT_MAC_ERROR_S) & TLSRX_HDR_PKT_MAC_ERROR_M)
279 #define TLSRX_HDR_PKT_MAC_ERROR_F TLSRX_HDR_PKT_MAC_ERROR_V(1U)
280
281 #define TLSRX_HDR_PKT_ERROR_M 0x1F
282 #define CONTENT_TYPE_ERROR 0x7F
283
284 struct ulp_mem_rw {
285 __be32 cmd;
286 __be32 len16; /* command length */
287 __be32 dlen; /* data length in 32-byte units */
288 __be32 lock_addr;
289 };
290
291 struct tls_key_wr {
292 __be32 op_to_compl;
293 __be32 flowid_len16;
294 __be32 ftid;
295 u8 reneg_to_write_rx;
296 u8 protocol;
297 __be16 mfs;
298 };
299
300 struct tls_key_req {
301 struct tls_key_wr wr;
302 struct ulp_mem_rw req;
303 struct ulptx_idata sc_imm;
304 };
305
306 /*
307 * This lives in skb->cb and is used to chain WRs in a linked list.
308 */
309 struct wr_skb_cb {
310 struct l2t_skb_cb l2t; /* reserve space for l2t CB */
311 struct sk_buff *next_wr; /* next write request */
312 };
313
314 /* Per-skb backlog handler. Run when a socket's backlog is processed. */
315 struct blog_skb_cb {
316 void (*backlog_rcv)(struct sock *sk, struct sk_buff *skb);
317 struct chtls_dev *cdev;
318 };
319
320 /*
321 * Similar to tcp_skb_cb but with ULP elements added to support TLS,
322 * etc.
323 */
324 struct ulp_skb_cb {
325 struct wr_skb_cb wr; /* reserve space for write request */
326 u16 flags; /* TCP-like flags */
327 u8 psh;
328 u8 ulp_mode; /* ULP mode/submode of sk_buff */
329 u32 seq; /* TCP sequence number */
330 union { /* ULP-specific fields */
331 struct {
332 u8 type;
333 u8 ofld;
334 u8 iv;
335 } tls;
336 } ulp;
337 };
338
339 #define ULP_SKB_CB(skb) ((struct ulp_skb_cb *)&((skb)->cb[0]))
340 #define BLOG_SKB_CB(skb) ((struct blog_skb_cb *)(skb)->cb)
341
342 /*
343 * Flags for ulp_skb_cb.flags.
344 */
345 enum {
346 ULPCB_FLAG_NEED_HDR = 1 << 0, /* packet needs a TX_DATA_WR header */
347 ULPCB_FLAG_NO_APPEND = 1 << 1, /* don't grow this skb */
348 ULPCB_FLAG_BARRIER = 1 << 2, /* set TX_WAIT_IDLE after sending */
349 ULPCB_FLAG_HOLD = 1 << 3, /* skb not ready for Tx yet */
350 ULPCB_FLAG_COMPL = 1 << 4, /* request WR completion */
351 ULPCB_FLAG_URG = 1 << 5, /* urgent data */
352 ULPCB_FLAG_TLS_HDR = 1 << 6, /* payload with tls hdr */
353 ULPCB_FLAG_NO_HDR = 1 << 7, /* not a ofld wr */
354 };
355
356 /* The ULP mode/submode of an skbuff */
357 #define skb_ulp_mode(skb) (ULP_SKB_CB(skb)->ulp_mode)
358 #define TCP_PAGE(sk) (sk->sk_frag.page)
359 #define TCP_OFF(sk) (sk->sk_frag.offset)
360
to_chtls_dev(struct tls_device * tlsdev)361 static inline struct chtls_dev *to_chtls_dev(struct tls_device *tlsdev)
362 {
363 return container_of(tlsdev, struct chtls_dev, tlsdev);
364 }
365
csk_set_flag(struct chtls_sock * csk,enum csk_flags flag)366 static inline void csk_set_flag(struct chtls_sock *csk,
367 enum csk_flags flag)
368 {
369 __set_bit(flag, &csk->flags);
370 }
371
csk_reset_flag(struct chtls_sock * csk,enum csk_flags flag)372 static inline void csk_reset_flag(struct chtls_sock *csk,
373 enum csk_flags flag)
374 {
375 __clear_bit(flag, &csk->flags);
376 }
377
csk_conn_inline(const struct chtls_sock * csk)378 static inline bool csk_conn_inline(const struct chtls_sock *csk)
379 {
380 return test_bit(CSK_CONN_INLINE, &csk->flags);
381 }
382
csk_flag(const struct sock * sk,enum csk_flags flag)383 static inline int csk_flag(const struct sock *sk, enum csk_flags flag)
384 {
385 struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
386
387 if (!csk_conn_inline(csk))
388 return 0;
389 return test_bit(flag, &csk->flags);
390 }
391
csk_flag_nochk(const struct chtls_sock * csk,enum csk_flags flag)392 static inline int csk_flag_nochk(const struct chtls_sock *csk,
393 enum csk_flags flag)
394 {
395 return test_bit(flag, &csk->flags);
396 }
397
cplhdr(struct sk_buff * skb)398 static inline void *cplhdr(struct sk_buff *skb)
399 {
400 return skb->data;
401 }
402
is_neg_adv(unsigned int status)403 static inline int is_neg_adv(unsigned int status)
404 {
405 return status == CPL_ERR_RTX_NEG_ADVICE ||
406 status == CPL_ERR_KEEPALV_NEG_ADVICE ||
407 status == CPL_ERR_PERSIST_NEG_ADVICE;
408 }
409
process_cpl_msg(void (* fn)(struct sock *,struct sk_buff *),struct sock * sk,struct sk_buff * skb)410 static inline void process_cpl_msg(void (*fn)(struct sock *, struct sk_buff *),
411 struct sock *sk,
412 struct sk_buff *skb)
413 {
414 skb_reset_mac_header(skb);
415 skb_reset_network_header(skb);
416 skb_reset_transport_header(skb);
417
418 bh_lock_sock(sk);
419 if (unlikely(sock_owned_by_user(sk))) {
420 BLOG_SKB_CB(skb)->backlog_rcv = fn;
421 __sk_add_backlog(sk, skb);
422 } else {
423 fn(sk, skb);
424 }
425 bh_unlock_sock(sk);
426 }
427
chtls_sock_free(struct kref * ref)428 static inline void chtls_sock_free(struct kref *ref)
429 {
430 struct chtls_sock *csk = container_of(ref, struct chtls_sock,
431 kref);
432 kfree(csk);
433 }
434
__chtls_sock_put(const char * fn,struct chtls_sock * csk)435 static inline void __chtls_sock_put(const char *fn, struct chtls_sock *csk)
436 {
437 kref_put(&csk->kref, chtls_sock_free);
438 }
439
__chtls_sock_get(const char * fn,struct chtls_sock * csk)440 static inline void __chtls_sock_get(const char *fn,
441 struct chtls_sock *csk)
442 {
443 kref_get(&csk->kref);
444 }
445
send_or_defer(struct sock * sk,struct tcp_sock * tp,struct sk_buff * skb,int through_l2t)446 static inline void send_or_defer(struct sock *sk, struct tcp_sock *tp,
447 struct sk_buff *skb, int through_l2t)
448 {
449 struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
450
451 if (through_l2t) {
452 /* send through L2T */
453 cxgb4_l2t_send(csk->egress_dev, skb, csk->l2t_entry);
454 } else {
455 /* send directly */
456 cxgb4_ofld_send(csk->egress_dev, skb);
457 }
458 }
459
460 typedef int (*chtls_handler_func)(struct chtls_dev *, struct sk_buff *);
461 extern chtls_handler_func chtls_handlers[NUM_CPL_CMDS];
462 void chtls_install_cpl_ops(struct sock *sk);
463 int chtls_init_kmap(struct chtls_dev *cdev, struct cxgb4_lld_info *lldi);
464 void chtls_listen_stop(struct chtls_dev *cdev, struct sock *sk);
465 int chtls_listen_start(struct chtls_dev *cdev, struct sock *sk);
466 void chtls_close(struct sock *sk, long timeout);
467 int chtls_disconnect(struct sock *sk, int flags);
468 void chtls_shutdown(struct sock *sk, int how);
469 void chtls_destroy_sock(struct sock *sk);
470 int chtls_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
471 int chtls_recvmsg(struct sock *sk, struct msghdr *msg,
472 size_t len, int nonblock, int flags, int *addr_len);
473 int chtls_sendpage(struct sock *sk, struct page *page,
474 int offset, size_t size, int flags);
475 int send_tx_flowc_wr(struct sock *sk, int compl,
476 u32 snd_nxt, u32 rcv_nxt);
477 void chtls_tcp_push(struct sock *sk, int flags);
478 int chtls_push_frames(struct chtls_sock *csk, int comp);
479 int chtls_set_tcb_tflag(struct sock *sk, unsigned int bit_pos, int val);
480 int chtls_setkey(struct chtls_sock *csk, u32 keylen, u32 mode);
481 void skb_entail(struct sock *sk, struct sk_buff *skb, int flags);
482 unsigned int keyid_to_addr(int start_addr, int keyid);
483 void free_tls_keyid(struct sock *sk);
484 #endif
485
