1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2018 Chelsio Communications, Inc.
5 * Written by: Atul Gupta (atul.gupta@chelsio.com)
7 #include <linux/kernel.h>
8 #include <linux/module.h>
9 #include <linux/skbuff.h>
10 #include <linux/socket.h>
11 #include <linux/hash.h>
13 #include <linux/net.h>
15 #include <linux/tcp.h>
22 #define DRV_NAME "chtls"
25 * chtls device management
26 * maintains a list of the chtls devices
28 static LIST_HEAD(cdev_list);
29 static DEFINE_MUTEX(cdev_mutex);
31 static DEFINE_MUTEX(notify_mutex);
32 static RAW_NOTIFIER_HEAD(listen_notify_list);
33 static struct proto chtls_cpl_prot;
34 struct request_sock_ops chtls_rsk_ops;
35 static uint send_page_order = (14 - PAGE_SHIFT < 0) ? 0 : 14 - PAGE_SHIFT;
37 static void register_listen_notifier(struct notifier_block *nb)
39 mutex_lock(¬ify_mutex);
40 raw_notifier_chain_register(&listen_notify_list, nb);
41 mutex_unlock(¬ify_mutex);
44 static void unregister_listen_notifier(struct notifier_block *nb)
46 mutex_lock(¬ify_mutex);
47 raw_notifier_chain_unregister(&listen_notify_list, nb);
48 mutex_unlock(¬ify_mutex);
51 static int listen_notify_handler(struct notifier_block *this,
52 unsigned long event, void *data)
54 struct chtls_listen *clisten;
55 int ret = NOTIFY_DONE;
57 clisten = (struct chtls_listen *)data;
60 case CHTLS_LISTEN_START:
61 ret = chtls_listen_start(clisten->cdev, clisten->sk);
64 case CHTLS_LISTEN_STOP:
65 chtls_listen_stop(clisten->cdev, clisten->sk);
72 static struct notifier_block listen_notifier = {
73 .notifier_call = listen_notify_handler
76 static int listen_backlog_rcv(struct sock *sk, struct sk_buff *skb)
78 if (likely(skb_transport_header(skb) != skb_network_header(skb)))
79 return tcp_v4_do_rcv(sk, skb);
80 BLOG_SKB_CB(skb)->backlog_rcv(sk, skb);
84 static int chtls_start_listen(struct chtls_dev *cdev, struct sock *sk)
86 struct chtls_listen *clisten;
89 if (sk->sk_protocol != IPPROTO_TCP)
90 return -EPROTONOSUPPORT;
92 if (sk->sk_family == PF_INET &&
93 LOOPBACK(inet_sk(sk)->inet_rcv_saddr))
94 return -EADDRNOTAVAIL;
96 sk->sk_backlog_rcv = listen_backlog_rcv;
97 clisten = kmalloc(sizeof(*clisten), GFP_KERNEL);
100 clisten->cdev = cdev;
102 mutex_lock(¬ify_mutex);
103 err = raw_notifier_call_chain(&listen_notify_list,
104 CHTLS_LISTEN_START, clisten);
105 mutex_unlock(¬ify_mutex);
109 static void chtls_stop_listen(struct chtls_dev *cdev, struct sock *sk)
111 struct chtls_listen *clisten;
113 if (sk->sk_protocol != IPPROTO_TCP)
116 clisten = kmalloc(sizeof(*clisten), GFP_KERNEL);
119 clisten->cdev = cdev;
121 mutex_lock(¬ify_mutex);
122 raw_notifier_call_chain(&listen_notify_list,
123 CHTLS_LISTEN_STOP, clisten);
124 mutex_unlock(¬ify_mutex);
127 static int chtls_inline_feature(struct tls_device *dev)
129 struct net_device *netdev;
130 struct chtls_dev *cdev;
133 cdev = to_chtls_dev(dev);
135 for (i = 0; i < cdev->lldi->nports; i++) {
136 netdev = cdev->ports[i];
137 if (netdev->features & NETIF_F_HW_TLS_RECORD)
143 static int chtls_create_hash(struct tls_device *dev, struct sock *sk)
145 struct chtls_dev *cdev = to_chtls_dev(dev);
147 if (sk->sk_state == TCP_LISTEN)
148 return chtls_start_listen(cdev, sk);
152 static void chtls_destroy_hash(struct tls_device *dev, struct sock *sk)
154 struct chtls_dev *cdev = to_chtls_dev(dev);
156 if (sk->sk_state == TCP_LISTEN)
157 chtls_stop_listen(cdev, sk);
160 static void chtls_free_uld(struct chtls_dev *cdev)
164 tls_unregister_device(&cdev->tlsdev);
165 kvfree(cdev->kmap.addr);
166 idr_destroy(&cdev->hwtid_idr);
167 for (i = 0; i < (1 << RSPQ_HASH_BITS); i++)
168 kfree_skb(cdev->rspq_skb_cache[i]);
170 kfree_skb(cdev->askb);
174 static inline void chtls_dev_release(struct kref *kref)
176 struct chtls_dev *cdev;
177 struct tls_device *dev;
179 dev = container_of(kref, struct tls_device, kref);
180 cdev = to_chtls_dev(dev);
181 chtls_free_uld(cdev);
184 static void chtls_register_dev(struct chtls_dev *cdev)
186 struct tls_device *tlsdev = &cdev->tlsdev;
188 strlcpy(tlsdev->name, "chtls", TLS_DEVICE_NAME_MAX);
189 strlcat(tlsdev->name, cdev->lldi->ports[0]->name,
190 TLS_DEVICE_NAME_MAX);
191 tlsdev->feature = chtls_inline_feature;
192 tlsdev->hash = chtls_create_hash;
193 tlsdev->unhash = chtls_destroy_hash;
194 tlsdev->release = chtls_dev_release;
195 kref_init(&tlsdev->kref);
196 tls_register_device(tlsdev);
197 cdev->cdev_state = CHTLS_CDEV_STATE_UP;
200 static void process_deferq(struct work_struct *task_param)
202 struct chtls_dev *cdev = container_of(task_param,
203 struct chtls_dev, deferq_task);
206 spin_lock_bh(&cdev->deferq.lock);
207 while ((skb = __skb_dequeue(&cdev->deferq)) != NULL) {
208 spin_unlock_bh(&cdev->deferq.lock);
209 DEFERRED_SKB_CB(skb)->handler(cdev, skb);
210 spin_lock_bh(&cdev->deferq.lock);
212 spin_unlock_bh(&cdev->deferq.lock);
215 static int chtls_get_skb(struct chtls_dev *cdev)
217 cdev->askb = alloc_skb(sizeof(struct tcphdr), GFP_KERNEL);
221 skb_put(cdev->askb, sizeof(struct tcphdr));
222 skb_reset_transport_header(cdev->askb);
223 memset(cdev->askb->data, 0, cdev->askb->len);
227 static void *chtls_uld_add(const struct cxgb4_lld_info *info)
229 struct cxgb4_lld_info *lldi;
230 struct chtls_dev *cdev;
233 cdev = kzalloc(sizeof(*cdev) + info->nports *
234 (sizeof(struct net_device *)), GFP_KERNEL);
238 lldi = kzalloc(sizeof(*lldi), GFP_KERNEL);
242 if (chtls_get_skb(cdev))
247 cdev->pdev = lldi->pdev;
248 cdev->tids = lldi->tids;
249 cdev->ports = lldi->ports;
250 cdev->mtus = lldi->mtus;
251 cdev->tids = lldi->tids;
252 cdev->pfvf = FW_VIID_PFN_G(cxgb4_port_viid(lldi->ports[0]))
255 for (i = 0; i < (1 << RSPQ_HASH_BITS); i++) {
256 unsigned int size = 64 - sizeof(struct rsp_ctrl) - 8;
258 cdev->rspq_skb_cache[i] = __alloc_skb(size,
261 if (unlikely(!cdev->rspq_skb_cache[i]))
265 idr_init(&cdev->hwtid_idr);
266 INIT_WORK(&cdev->deferq_task, process_deferq);
267 spin_lock_init(&cdev->listen_lock);
268 spin_lock_init(&cdev->idr_lock);
269 cdev->send_page_order = min_t(uint, get_order(32768),
271 cdev->max_host_sndbuf = 48 * 1024;
273 if (lldi->vr->key.size)
274 if (chtls_init_kmap(cdev, lldi))
277 mutex_lock(&cdev_mutex);
278 list_add_tail(&cdev->list, &cdev_list);
279 mutex_unlock(&cdev_mutex);
283 for (j = 0; j < i; j++)
284 kfree_skb(cdev->rspq_skb_cache[j]);
285 kfree_skb(cdev->askb);
294 static void chtls_free_all_uld(void)
296 struct chtls_dev *cdev, *tmp;
298 mutex_lock(&cdev_mutex);
299 list_for_each_entry_safe(cdev, tmp, &cdev_list, list) {
300 if (cdev->cdev_state == CHTLS_CDEV_STATE_UP) {
301 list_del(&cdev->list);
302 kref_put(&cdev->tlsdev.kref, cdev->tlsdev.release);
305 mutex_unlock(&cdev_mutex);
308 static int chtls_uld_state_change(void *handle, enum cxgb4_state new_state)
310 struct chtls_dev *cdev = handle;
314 chtls_register_dev(cdev);
316 case CXGB4_STATE_DOWN:
318 case CXGB4_STATE_START_RECOVERY:
320 case CXGB4_STATE_DETACH:
321 mutex_lock(&cdev_mutex);
322 list_del(&cdev->list);
323 mutex_unlock(&cdev_mutex);
324 kref_put(&cdev->tlsdev.kref, cdev->tlsdev.release);
332 static struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
338 /* Allocate space for cpl_pass_accpet_req which will be synthesized by
339 * driver. Once driver synthesizes cpl_pass_accpet_req the skb will go
340 * through the regular cpl_pass_accept_req processing in TOM.
342 skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req)
343 - pktshift, GFP_ATOMIC);
346 __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req)
348 /* For now we will copy cpl_rx_pkt in the skb */
349 skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_rx_pkt));
350 skb_copy_to_linear_data_offset(skb, sizeof(struct cpl_pass_accept_req)
352 gl->tot_len - pktshift);
357 static int chtls_recv_packet(struct chtls_dev *cdev,
358 const struct pkt_gl *gl, const __be64 *rsp)
360 unsigned int opcode = *(u8 *)rsp;
364 skb = copy_gl_to_skb_pkt(gl, rsp, cdev->lldi->sge_pktshift);
368 ret = chtls_handlers[opcode](cdev, skb);
369 if (ret & CPL_RET_BUF_DONE)
375 static int chtls_recv_rsp(struct chtls_dev *cdev, const __be64 *rsp)
377 unsigned long rspq_bin;
383 len = 64 - sizeof(struct rsp_ctrl) - 8;
386 rspq_bin = hash_ptr((void *)rsp, RSPQ_HASH_BITS);
387 skb = cdev->rspq_skb_cache[rspq_bin];
388 if (skb && !skb_is_nonlinear(skb) &&
389 !skb_shared(skb) && !skb_cloned(skb)) {
390 refcount_inc(&skb->users);
391 if (refcount_read(&skb->users) == 2) {
393 if (skb_tailroom(skb) >= len)
396 refcount_dec(&skb->users);
398 skb = alloc_skb(len, GFP_ATOMIC);
404 skb_copy_to_linear_data(skb, rsp, len);
405 skb_reset_network_header(skb);
406 skb_reset_transport_header(skb);
407 ret = chtls_handlers[opcode](cdev, skb);
409 if (ret & CPL_RET_BUF_DONE)
414 static void chtls_recv(struct chtls_dev *cdev,
415 struct sk_buff **skbs, const __be64 *rsp)
417 struct sk_buff *skb = *skbs;
423 __skb_push(skb, sizeof(struct rss_header));
424 skb_copy_to_linear_data(skb, rsp, sizeof(struct rss_header));
426 ret = chtls_handlers[opcode](cdev, skb);
427 if (ret & CPL_RET_BUF_DONE)
431 static int chtls_uld_rx_handler(void *handle, const __be64 *rsp,
432 const struct pkt_gl *gl)
434 struct chtls_dev *cdev = handle;
440 if (unlikely(opcode == CPL_RX_PKT)) {
441 if (chtls_recv_packet(cdev, gl, rsp) < 0)
447 return chtls_recv_rsp(cdev, rsp);
449 #define RX_PULL_LEN 128
450 skb = cxgb4_pktgl_to_skb(gl, RX_PULL_LEN, RX_PULL_LEN);
453 chtls_recv(cdev, &skb, rsp);
460 static int do_chtls_getsockopt(struct sock *sk, char __user *optval,
463 struct tls_crypto_info crypto_info = { 0 };
465 crypto_info.version = TLS_1_2_VERSION;
466 if (copy_to_user(optval, &crypto_info, sizeof(struct tls_crypto_info)))
471 static int chtls_getsockopt(struct sock *sk, int level, int optname,
472 char __user *optval, int __user *optlen)
474 struct tls_context *ctx = tls_get_ctx(sk);
476 if (level != SOL_TLS)
477 return ctx->getsockopt(sk, level, optname, optval, optlen);
479 return do_chtls_getsockopt(sk, optval, optlen);
482 static int do_chtls_setsockopt(struct sock *sk, int optname,
483 char __user *optval, unsigned int optlen)
485 struct tls_crypto_info *crypto_info, tmp_crypto_info;
486 struct chtls_sock *csk;
490 csk = rcu_dereference_sk_user_data(sk);
492 if (!optval || optlen < sizeof(*crypto_info)) {
497 rc = copy_from_user(&tmp_crypto_info, optval, sizeof(*crypto_info));
504 if (tmp_crypto_info.version != TLS_1_2_VERSION) {
509 crypto_info = (struct tls_crypto_info *)&csk->tlshws.crypto_info;
511 switch (tmp_crypto_info.cipher_type) {
512 case TLS_CIPHER_AES_GCM_128: {
513 /* Obtain version and type from previous copy */
514 crypto_info[0] = tmp_crypto_info;
515 /* Now copy the following data */
516 rc = copy_from_user((char *)crypto_info + sizeof(*crypto_info),
517 optval + sizeof(*crypto_info),
518 sizeof(struct tls12_crypto_info_aes_gcm_128)
519 - sizeof(*crypto_info));
526 keylen = TLS_CIPHER_AES_GCM_128_KEY_SIZE;
527 rc = chtls_setkey(csk, keylen, optname);
538 static int chtls_setsockopt(struct sock *sk, int level, int optname,
539 char __user *optval, unsigned int optlen)
541 struct tls_context *ctx = tls_get_ctx(sk);
543 if (level != SOL_TLS)
544 return ctx->setsockopt(sk, level, optname, optval, optlen);
546 return do_chtls_setsockopt(sk, optname, optval, optlen);
549 static struct cxgb4_uld_info chtls_uld_info = {
551 .nrxq = MAX_ULD_QSETS,
552 .ntxq = MAX_ULD_QSETS,
554 .add = chtls_uld_add,
555 .state_change = chtls_uld_state_change,
556 .rx_handler = chtls_uld_rx_handler,
559 void chtls_install_cpl_ops(struct sock *sk)
561 sk->sk_prot = &chtls_cpl_prot;
564 static void __init chtls_init_ulp_ops(void)
566 chtls_cpl_prot = tcp_prot;
567 chtls_init_rsk_ops(&chtls_cpl_prot, &chtls_rsk_ops,
569 chtls_cpl_prot.close = chtls_close;
570 chtls_cpl_prot.disconnect = chtls_disconnect;
571 chtls_cpl_prot.destroy = chtls_destroy_sock;
572 chtls_cpl_prot.shutdown = chtls_shutdown;
573 chtls_cpl_prot.sendmsg = chtls_sendmsg;
574 chtls_cpl_prot.sendpage = chtls_sendpage;
575 chtls_cpl_prot.recvmsg = chtls_recvmsg;
576 chtls_cpl_prot.setsockopt = chtls_setsockopt;
577 chtls_cpl_prot.getsockopt = chtls_getsockopt;
580 static int __init chtls_register(void)
582 chtls_init_ulp_ops();
583 register_listen_notifier(&listen_notifier);
584 cxgb4_register_uld(CXGB4_ULD_TLS, &chtls_uld_info);
588 static void __exit chtls_unregister(void)
590 unregister_listen_notifier(&listen_notifier);
591 chtls_free_all_uld();
592 cxgb4_unregister_uld(CXGB4_ULD_TLS);
595 module_init(chtls_register);
596 module_exit(chtls_unregister);
598 MODULE_DESCRIPTION("Chelsio TLS Inline driver");
599 MODULE_LICENSE("GPL");
600 MODULE_AUTHOR("Chelsio Communications");
601 MODULE_VERSION(DRV_VERSION);