1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
2
3#include "funeth.h"
4#include "funeth_ktls.h"
5
6static int fun_admin_ktls_create(struct funeth_priv *fp, unsigned int id)
7{
8	struct fun_admin_ktls_create_req req = {
9		.common = FUN_ADMIN_REQ_COMMON_INIT2(FUN_ADMIN_OP_KTLS,
10						     sizeof(req)),
11		.subop = FUN_ADMIN_SUBOP_CREATE,
12		.id = cpu_to_be32(id),
13	};
14
15	return fun_submit_admin_sync_cmd(fp->fdev, &req.common, NULL, 0, 0);
16}
17
18static int fun_ktls_add(struct net_device *netdev, struct sock *sk,
19			enum tls_offload_ctx_dir direction,
20			struct tls_crypto_info *crypto_info,
21			u32 start_offload_tcp_sn)
22{
23	struct funeth_priv *fp = netdev_priv(netdev);
24	struct fun_admin_ktls_modify_req req = {
25		.common = FUN_ADMIN_REQ_COMMON_INIT2(FUN_ADMIN_OP_KTLS,
26						     sizeof(req)),
27		.subop = FUN_ADMIN_SUBOP_MODIFY,
28		.id = cpu_to_be32(fp->ktls_id),
29		.tcp_seq = cpu_to_be32(start_offload_tcp_sn),
30	};
31	struct fun_admin_ktls_modify_rsp rsp;
32	struct fun_ktls_tx_ctx *tx_ctx;
33	int rc;
34
35	if (direction != TLS_OFFLOAD_CTX_DIR_TX)
36		return -EOPNOTSUPP;
37
38	if (crypto_info->version == TLS_1_2_VERSION)
39		req.version = FUN_KTLS_TLSV2;
40	else
41		return -EOPNOTSUPP;
42
43	switch (crypto_info->cipher_type) {
44	case TLS_CIPHER_AES_GCM_128: {
45		struct tls12_crypto_info_aes_gcm_128 *c = (void *)crypto_info;
46
47		req.cipher = FUN_KTLS_CIPHER_AES_GCM_128;
48		memcpy(req.key, c->key, sizeof(c->key));
49		memcpy(req.iv, c->iv, sizeof(c->iv));
50		memcpy(req.salt, c->salt, sizeof(c->salt));
51		memcpy(req.record_seq, c->rec_seq, sizeof(c->rec_seq));
52		break;
53	}
54	default:
55		return -EOPNOTSUPP;
56	}
57
58	rc = fun_submit_admin_sync_cmd(fp->fdev, &req.common, &rsp,
59				       sizeof(rsp), 0);
60	memzero_explicit(&req, sizeof(req));
61	if (rc)
62		return rc;
63
64	tx_ctx = tls_driver_ctx(sk, direction);
65	tx_ctx->tlsid = rsp.tlsid;
66	tx_ctx->next_seq = start_offload_tcp_sn;
67	atomic64_inc(&fp->tx_tls_add);
68	return 0;
69}
70
71static void fun_ktls_del(struct net_device *netdev,
72			 struct tls_context *tls_ctx,
73			 enum tls_offload_ctx_dir direction)
74{
75	struct funeth_priv *fp = netdev_priv(netdev);
76	struct fun_admin_ktls_modify_req req;
77	struct fun_ktls_tx_ctx *tx_ctx;
78
79	if (direction != TLS_OFFLOAD_CTX_DIR_TX)
80		return;
81
82	tx_ctx = __tls_driver_ctx(tls_ctx, direction);
83
84	req.common = FUN_ADMIN_REQ_COMMON_INIT2(FUN_ADMIN_OP_KTLS,
85			offsetof(struct fun_admin_ktls_modify_req, tcp_seq));
86	req.subop = FUN_ADMIN_SUBOP_MODIFY;
87	req.flags = cpu_to_be16(FUN_KTLS_MODIFY_REMOVE);
88	req.id = cpu_to_be32(fp->ktls_id);
89	req.tlsid = tx_ctx->tlsid;
90
91	fun_submit_admin_sync_cmd(fp->fdev, &req.common, NULL, 0, 0);
92	atomic64_inc(&fp->tx_tls_del);
93}
94
95static int fun_ktls_resync(struct net_device *netdev, struct sock *sk, u32 seq,
96			   u8 *rcd_sn, enum tls_offload_ctx_dir direction)
97{
98	struct funeth_priv *fp = netdev_priv(netdev);
99	struct fun_admin_ktls_modify_req req;
100	struct fun_ktls_tx_ctx *tx_ctx;
101	int rc;
102
103	if (direction != TLS_OFFLOAD_CTX_DIR_TX)
104		return -EOPNOTSUPP;
105
106	tx_ctx = tls_driver_ctx(sk, direction);
107
108	req.common = FUN_ADMIN_REQ_COMMON_INIT2(FUN_ADMIN_OP_KTLS,
109			offsetof(struct fun_admin_ktls_modify_req, key));
110	req.subop = FUN_ADMIN_SUBOP_MODIFY;
111	req.flags = 0;
112	req.id = cpu_to_be32(fp->ktls_id);
113	req.tlsid = tx_ctx->tlsid;
114	req.tcp_seq = cpu_to_be32(seq);
115	req.version = 0;
116	req.cipher = 0;
117	memcpy(req.record_seq, rcd_sn, sizeof(req.record_seq));
118
119	atomic64_inc(&fp->tx_tls_resync);
120	rc = fun_submit_admin_sync_cmd(fp->fdev, &req.common, NULL, 0, 0);
121	if (!rc)
122		tx_ctx->next_seq = seq;
123	return rc;
124}
125
126static const struct tlsdev_ops fun_ktls_ops = {
127	.tls_dev_add = fun_ktls_add,
128	.tls_dev_del = fun_ktls_del,
129	.tls_dev_resync = fun_ktls_resync,
130};
131
132int fun_ktls_init(struct net_device *netdev)
133{
134	struct funeth_priv *fp = netdev_priv(netdev);
135	int rc;
136
137	rc = fun_admin_ktls_create(fp, netdev->dev_port);
138	if (rc)
139		return rc;
140
141	fp->ktls_id = netdev->dev_port;
142	netdev->tlsdev_ops = &fun_ktls_ops;
143	netdev->hw_features |= NETIF_F_HW_TLS_TX;
144	netdev->features |= NETIF_F_HW_TLS_TX;
145	return 0;
146}
147
148void fun_ktls_cleanup(struct funeth_priv *fp)
149{
150	if (fp->ktls_id == FUN_HCI_ID_INVALID)
151		return;
152
153	fun_res_destroy(fp->fdev, FUN_ADMIN_OP_KTLS, 0, fp->ktls_id);
154	fp->ktls_id = FUN_HCI_ID_INVALID;
155}
156