1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2018 Chelsio Communications, Inc.
4  *
5  * Written by: Atul Gupta (atul.gupta@chelsio.com)
6  */
7 
8 #include <linux/module.h>
9 #include <linux/list.h>
10 #include <linux/workqueue.h>
11 #include <linux/skbuff.h>
12 #include <linux/timer.h>
13 #include <linux/notifier.h>
14 #include <linux/inetdevice.h>
15 #include <linux/ip.h>
16 #include <linux/tcp.h>
17 #include <linux/tls.h>
18 #include <net/tls.h>
19 
20 #include "chtls.h"
21 #include "chtls_cm.h"
22 
23 static void __set_tcb_field_direct(struct chtls_sock *csk,
24 				   struct cpl_set_tcb_field *req, u16 word,
25 				   u64 mask, u64 val, u8 cookie, int no_reply)
26 {
27 	struct ulptx_idata *sc;
28 
29 	INIT_TP_WR_CPL(req, CPL_SET_TCB_FIELD, csk->tid);
30 	req->wr.wr_mid |= htonl(FW_WR_FLOWID_V(csk->tid));
31 	req->reply_ctrl = htons(NO_REPLY_V(no_reply) |
32 				QUEUENO_V(csk->rss_qid));
33 	req->word_cookie = htons(TCB_WORD_V(word) | TCB_COOKIE_V(cookie));
34 	req->mask = cpu_to_be64(mask);
35 	req->val = cpu_to_be64(val);
36 	sc = (struct ulptx_idata *)(req + 1);
37 	sc->cmd_more = htonl(ULPTX_CMD_V(ULP_TX_SC_NOOP));
38 	sc->len = htonl(0);
39 }
40 
41 static void __set_tcb_field(struct sock *sk, struct sk_buff *skb, u16 word,
42 			    u64 mask, u64 val, u8 cookie, int no_reply)
43 {
44 	struct cpl_set_tcb_field *req;
45 	struct chtls_sock *csk;
46 	struct ulptx_idata *sc;
47 	unsigned int wrlen;
48 
49 	wrlen = roundup(sizeof(*req) + sizeof(*sc), 16);
50 	csk = rcu_dereference_sk_user_data(sk);
51 
52 	req = (struct cpl_set_tcb_field *)__skb_put(skb, wrlen);
53 	__set_tcb_field_direct(csk, req, word, mask, val, cookie, no_reply);
54 	set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
55 }
56 
57 /*
58  * Send control message to HW, message go as immediate data and packet
59  * is freed immediately.
60  */
61 static int chtls_set_tcb_field(struct sock *sk, u16 word, u64 mask, u64 val)
62 {
63 	struct cpl_set_tcb_field *req;
64 	unsigned int credits_needed;
65 	struct chtls_sock *csk;
66 	struct ulptx_idata *sc;
67 	struct sk_buff *skb;
68 	unsigned int wrlen;
69 	int ret;
70 
71 	wrlen = roundup(sizeof(*req) + sizeof(*sc), 16);
72 
73 	skb = alloc_skb(wrlen, GFP_ATOMIC);
74 	if (!skb)
75 		return -ENOMEM;
76 
77 	credits_needed = DIV_ROUND_UP(wrlen, 16);
78 	csk = rcu_dereference_sk_user_data(sk);
79 
80 	__set_tcb_field(sk, skb, word, mask, val, 0, 1);
81 	skb_set_queue_mapping(skb, (csk->txq_idx << 1) | CPL_PRIORITY_DATA);
82 	csk->wr_credits -= credits_needed;
83 	csk->wr_unacked += credits_needed;
84 	enqueue_wr(csk, skb);
85 	ret = cxgb4_ofld_send(csk->egress_dev, skb);
86 	if (ret < 0)
87 		kfree_skb(skb);
88 	return ret < 0 ? ret : 0;
89 }
90 
91 /*
92  * Set one of the t_flags bits in the TCB.
93  */
94 int chtls_set_tcb_tflag(struct sock *sk, unsigned int bit_pos, int val)
95 {
96 	return chtls_set_tcb_field(sk, 1, 1ULL << bit_pos,
97 				   (u64)val << bit_pos);
98 }
99 
100 static int chtls_set_tcb_keyid(struct sock *sk, int keyid)
101 {
102 	return chtls_set_tcb_field(sk, 31, 0xFFFFFFFFULL, keyid);
103 }
104 
105 static int chtls_set_tcb_seqno(struct sock *sk)
106 {
107 	return chtls_set_tcb_field(sk, 28, ~0ULL, 0);
108 }
109 
110 static int chtls_set_tcb_quiesce(struct sock *sk, int val)
111 {
112 	return chtls_set_tcb_field(sk, 1, (1ULL << TF_RX_QUIESCE_S),
113 				   TF_RX_QUIESCE_V(val));
114 }
115 
116 /* TLS Key bitmap processing */
117 int chtls_init_kmap(struct chtls_dev *cdev, struct cxgb4_lld_info *lldi)
118 {
119 	unsigned int num_key_ctx, bsize;
120 	int ksize;
121 
122 	num_key_ctx = (lldi->vr->key.size / TLS_KEY_CONTEXT_SZ);
123 	bsize = BITS_TO_LONGS(num_key_ctx);
124 
125 	cdev->kmap.size = num_key_ctx;
126 	cdev->kmap.available = bsize;
127 	ksize = sizeof(*cdev->kmap.addr) * bsize;
128 	cdev->kmap.addr = kvzalloc(ksize, GFP_KERNEL);
129 	if (!cdev->kmap.addr)
130 		return -ENOMEM;
131 
132 	cdev->kmap.start = lldi->vr->key.start;
133 	spin_lock_init(&cdev->kmap.lock);
134 	return 0;
135 }
136 
137 static int get_new_keyid(struct chtls_sock *csk, u32 optname)
138 {
139 	struct net_device *dev = csk->egress_dev;
140 	struct chtls_dev *cdev = csk->cdev;
141 	struct chtls_hws *hws;
142 	struct adapter *adap;
143 	int keyid;
144 
145 	adap = netdev2adap(dev);
146 	hws = &csk->tlshws;
147 
148 	spin_lock_bh(&cdev->kmap.lock);
149 	keyid = find_first_zero_bit(cdev->kmap.addr, cdev->kmap.size);
150 	if (keyid < cdev->kmap.size) {
151 		__set_bit(keyid, cdev->kmap.addr);
152 		if (optname == TLS_RX)
153 			hws->rxkey = keyid;
154 		else
155 			hws->txkey = keyid;
156 		atomic_inc(&adap->chcr_stats.tls_key);
157 	} else {
158 		keyid = -1;
159 	}
160 	spin_unlock_bh(&cdev->kmap.lock);
161 	return keyid;
162 }
163 
164 void free_tls_keyid(struct sock *sk)
165 {
166 	struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
167 	struct net_device *dev = csk->egress_dev;
168 	struct chtls_dev *cdev = csk->cdev;
169 	struct chtls_hws *hws;
170 	struct adapter *adap;
171 
172 	if (!cdev->kmap.addr)
173 		return;
174 
175 	adap = netdev2adap(dev);
176 	hws = &csk->tlshws;
177 
178 	spin_lock_bh(&cdev->kmap.lock);
179 	if (hws->rxkey >= 0) {
180 		__clear_bit(hws->rxkey, cdev->kmap.addr);
181 		atomic_dec(&adap->chcr_stats.tls_key);
182 		hws->rxkey = -1;
183 	}
184 	if (hws->txkey >= 0) {
185 		__clear_bit(hws->txkey, cdev->kmap.addr);
186 		atomic_dec(&adap->chcr_stats.tls_key);
187 		hws->txkey = -1;
188 	}
189 	spin_unlock_bh(&cdev->kmap.lock);
190 }
191 
192 unsigned int keyid_to_addr(int start_addr, int keyid)
193 {
194 	return (start_addr + (keyid * TLS_KEY_CONTEXT_SZ)) >> 5;
195 }
196 
197 static void chtls_rxkey_ivauth(struct _key_ctx *kctx)
198 {
199 	kctx->iv_to_auth = cpu_to_be64(KEYCTX_TX_WR_IV_V(6ULL) |
200 				  KEYCTX_TX_WR_AAD_V(1ULL) |
201 				  KEYCTX_TX_WR_AADST_V(5ULL) |
202 				  KEYCTX_TX_WR_CIPHER_V(14ULL) |
203 				  KEYCTX_TX_WR_CIPHERST_V(0ULL) |
204 				  KEYCTX_TX_WR_AUTH_V(14ULL) |
205 				  KEYCTX_TX_WR_AUTHST_V(16ULL) |
206 				  KEYCTX_TX_WR_AUTHIN_V(16ULL));
207 }
208 
209 static int chtls_key_info(struct chtls_sock *csk,
210 			  struct _key_ctx *kctx,
211 			  u32 keylen, u32 optname,
212 			  int cipher_type)
213 {
214 	unsigned char key[AES_MAX_KEY_SIZE];
215 	unsigned char *key_p, *salt;
216 	unsigned char ghash_h[AEAD_H_SIZE];
217 	int ck_size, key_ctx_size, kctx_mackey_size, salt_size;
218 	struct crypto_aes_ctx aes;
219 	int ret;
220 
221 	key_ctx_size = sizeof(struct _key_ctx) +
222 		       roundup(keylen, 16) + AEAD_H_SIZE;
223 
224 	/* GCM mode of AES supports 128 and 256 bit encryption, so
225 	 * prepare key context base on GCM cipher type
226 	 */
227 	switch (cipher_type) {
228 	case TLS_CIPHER_AES_GCM_128: {
229 		struct tls12_crypto_info_aes_gcm_128 *gcm_ctx_128 =
230 			(struct tls12_crypto_info_aes_gcm_128 *)
231 					&csk->tlshws.crypto_info;
232 		memcpy(key, gcm_ctx_128->key, keylen);
233 
234 		key_p            = gcm_ctx_128->key;
235 		salt             = gcm_ctx_128->salt;
236 		ck_size          = CHCR_KEYCTX_CIPHER_KEY_SIZE_128;
237 		salt_size        = TLS_CIPHER_AES_GCM_128_SALT_SIZE;
238 		kctx_mackey_size = CHCR_KEYCTX_MAC_KEY_SIZE_128;
239 		break;
240 	}
241 	case TLS_CIPHER_AES_GCM_256: {
242 		struct tls12_crypto_info_aes_gcm_256 *gcm_ctx_256 =
243 			(struct tls12_crypto_info_aes_gcm_256 *)
244 					&csk->tlshws.crypto_info;
245 		memcpy(key, gcm_ctx_256->key, keylen);
246 
247 		key_p            = gcm_ctx_256->key;
248 		salt             = gcm_ctx_256->salt;
249 		ck_size          = CHCR_KEYCTX_CIPHER_KEY_SIZE_256;
250 		salt_size        = TLS_CIPHER_AES_GCM_256_SALT_SIZE;
251 		kctx_mackey_size = CHCR_KEYCTX_MAC_KEY_SIZE_256;
252 		break;
253 	}
254 	default:
255 		pr_err("GCM: Invalid key length %d\n", keylen);
256 		return -EINVAL;
257 	}
258 
259 	/* Calculate the H = CIPH(K, 0 repeated 16 times).
260 	 * It will go in key context
261 	 */
262 	ret = aes_expandkey(&aes, key, keylen);
263 	if (ret)
264 		return ret;
265 
266 	memset(ghash_h, 0, AEAD_H_SIZE);
267 	aes_encrypt(&aes, ghash_h, ghash_h);
268 	memzero_explicit(&aes, sizeof(aes));
269 	csk->tlshws.keylen = key_ctx_size;
270 
271 	/* Copy the Key context */
272 	if (optname == TLS_RX) {
273 		int key_ctx;
274 
275 		key_ctx = ((key_ctx_size >> 4) << 3);
276 		kctx->ctx_hdr = FILL_KEY_CRX_HDR(ck_size,
277 						 kctx_mackey_size,
278 						 0, 0, key_ctx);
279 		chtls_rxkey_ivauth(kctx);
280 	} else {
281 		kctx->ctx_hdr = FILL_KEY_CTX_HDR(ck_size,
282 						 kctx_mackey_size,
283 						 0, 0, key_ctx_size >> 4);
284 	}
285 
286 	memcpy(kctx->salt, salt, salt_size);
287 	memcpy(kctx->key, key_p, keylen);
288 	memcpy(kctx->key + keylen, ghash_h, AEAD_H_SIZE);
289 	/* erase key info from driver */
290 	memset(key_p, 0, keylen);
291 
292 	return 0;
293 }
294 
295 static void chtls_set_scmd(struct chtls_sock *csk)
296 {
297 	struct chtls_hws *hws = &csk->tlshws;
298 
299 	hws->scmd.seqno_numivs =
300 		SCMD_SEQ_NO_CTRL_V(3) |
301 		SCMD_PROTO_VERSION_V(0) |
302 		SCMD_ENC_DEC_CTRL_V(0) |
303 		SCMD_CIPH_AUTH_SEQ_CTRL_V(1) |
304 		SCMD_CIPH_MODE_V(2) |
305 		SCMD_AUTH_MODE_V(4) |
306 		SCMD_HMAC_CTRL_V(0) |
307 		SCMD_IV_SIZE_V(4) |
308 		SCMD_NUM_IVS_V(1);
309 
310 	hws->scmd.ivgen_hdrlen =
311 		SCMD_IV_GEN_CTRL_V(1) |
312 		SCMD_KEY_CTX_INLINE_V(0) |
313 		SCMD_TLS_FRAG_ENABLE_V(1);
314 }
315 
316 int chtls_setkey(struct chtls_sock *csk, u32 keylen,
317 		 u32 optname, int cipher_type)
318 {
319 	struct tls_key_req *kwr;
320 	struct chtls_dev *cdev;
321 	struct _key_ctx *kctx;
322 	int wrlen, klen, len;
323 	struct sk_buff *skb;
324 	struct sock *sk;
325 	int keyid;
326 	int kaddr;
327 	int ret;
328 
329 	cdev = csk->cdev;
330 	sk = csk->sk;
331 
332 	klen = roundup((keylen + AEAD_H_SIZE) + sizeof(*kctx), 32);
333 	wrlen = roundup(sizeof(*kwr), 16);
334 	len = klen + wrlen;
335 
336 	/* Flush out-standing data before new key takes effect */
337 	if (optname == TLS_TX) {
338 		lock_sock(sk);
339 		if (skb_queue_len(&csk->txq))
340 			chtls_push_frames(csk, 0);
341 		release_sock(sk);
342 	}
343 
344 	skb = alloc_skb(len, GFP_KERNEL);
345 	if (!skb)
346 		return -ENOMEM;
347 
348 	keyid = get_new_keyid(csk, optname);
349 	if (keyid < 0) {
350 		ret = -ENOSPC;
351 		goto out_nokey;
352 	}
353 
354 	kaddr = keyid_to_addr(cdev->kmap.start, keyid);
355 	kwr = (struct tls_key_req *)__skb_put_zero(skb, len);
356 	kwr->wr.op_to_compl =
357 		cpu_to_be32(FW_WR_OP_V(FW_ULPTX_WR) | FW_WR_COMPL_F |
358 		      FW_WR_ATOMIC_V(1U));
359 	kwr->wr.flowid_len16 =
360 		cpu_to_be32(FW_WR_LEN16_V(DIV_ROUND_UP(len, 16) |
361 			    FW_WR_FLOWID_V(csk->tid)));
362 	kwr->wr.protocol = 0;
363 	kwr->wr.mfs = htons(TLS_MFS);
364 	kwr->wr.reneg_to_write_rx = optname;
365 
366 	/* ulptx command */
367 	kwr->req.cmd = cpu_to_be32(ULPTX_CMD_V(ULP_TX_MEM_WRITE) |
368 			    T5_ULP_MEMIO_ORDER_V(1) |
369 			    T5_ULP_MEMIO_IMM_V(1));
370 	kwr->req.len16 = cpu_to_be32((csk->tid << 8) |
371 			      DIV_ROUND_UP(len - sizeof(kwr->wr), 16));
372 	kwr->req.dlen = cpu_to_be32(ULP_MEMIO_DATA_LEN_V(klen >> 5));
373 	kwr->req.lock_addr = cpu_to_be32(ULP_MEMIO_ADDR_V(kaddr));
374 
375 	/* sub command */
376 	kwr->sc_imm.cmd_more = cpu_to_be32(ULPTX_CMD_V(ULP_TX_SC_IMM));
377 	kwr->sc_imm.len = cpu_to_be32(klen);
378 
379 	lock_sock(sk);
380 	/* key info */
381 	kctx = (struct _key_ctx *)(kwr + 1);
382 	ret = chtls_key_info(csk, kctx, keylen, optname, cipher_type);
383 	if (ret)
384 		goto out_notcb;
385 
386 	if (unlikely(csk_flag(sk, CSK_ABORT_SHUTDOWN)))
387 		goto out_notcb;
388 
389 	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->tlshws.txqid);
390 	csk->wr_credits -= DIV_ROUND_UP(len, 16);
391 	csk->wr_unacked += DIV_ROUND_UP(len, 16);
392 	enqueue_wr(csk, skb);
393 	cxgb4_ofld_send(csk->egress_dev, skb);
394 
395 	chtls_set_scmd(csk);
396 	/* Clear quiesce for Rx key */
397 	if (optname == TLS_RX) {
398 		ret = chtls_set_tcb_keyid(sk, keyid);
399 		if (ret)
400 			goto out_notcb;
401 		ret = chtls_set_tcb_field(sk, 0,
402 					  TCB_ULP_RAW_V(TCB_ULP_RAW_M),
403 					  TCB_ULP_RAW_V((TF_TLS_KEY_SIZE_V(1) |
404 					  TF_TLS_CONTROL_V(1) |
405 					  TF_TLS_ACTIVE_V(1) |
406 					  TF_TLS_ENABLE_V(1))));
407 		if (ret)
408 			goto out_notcb;
409 		ret = chtls_set_tcb_seqno(sk);
410 		if (ret)
411 			goto out_notcb;
412 		ret = chtls_set_tcb_quiesce(sk, 0);
413 		if (ret)
414 			goto out_notcb;
415 		csk->tlshws.rxkey = keyid;
416 	} else {
417 		csk->tlshws.tx_seq_no = 0;
418 		csk->tlshws.txkey = keyid;
419 	}
420 
421 	release_sock(sk);
422 	return ret;
423 out_notcb:
424 	release_sock(sk);
425 	free_tls_keyid(sk);
426 out_nokey:
427 	kfree_skb(skb);
428 	return ret;
429 }
430