// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2019 Netronome Systems, Inc. */
#include <linux/bitfield.h>
#include <linux/ipv6.h>
#include <linux/skbuff.h>
#include <net/tls.h>
#include "../ccm.h"
#include "../nfp_net.h"
#include "crypto.h"
#include "fw.h"
#define NFP_NET_TLS_CCM_MBOX_OPS_MASK \
(BIT(NFP_CCM_TYPE_CRYPTO_RESET) | \
BIT(NFP_CCM_TYPE_CRYPTO_ADD) | \
BIT(NFP_CCM_TYPE_CRYPTO_DEL) | \
BIT(NFP_CCM_TYPE_CRYPTO_UPDATE))
#define NFP_NET_TLS_OPCODE_MASK_RX \
BIT(NFP_NET_CRYPTO_OP_TLS_1_2_AES_GCM_128_DEC)
#define NFP_NET_TLS_OPCODE_MASK_TX \
BIT(NFP_NET_CRYPTO_OP_TLS_1_2_AES_GCM_128_ENC)
#define NFP_NET_TLS_OPCODE_MASK \
(NFP_NET_TLS_OPCODE_MASK_RX | NFP_NET_TLS_OPCODE_MASK_TX)
static void nfp_net_crypto_set_op(struct nfp_net *nn, u8 opcode, bool on)
{
u32 off, val;
off = nn->tlv_caps.crypto_enable_off + round_down(opcode / 8, 4);
val = nn_readl(nn, off);
if (on)
val |= BIT(opcode & 31);
else
val &= ~BIT(opcode & 31);
nn_writel(nn, off, val);
}
static bool
__nfp_net_tls_conn_cnt_changed(struct nfp_net *nn, int add,
enum tls_offload_ctx_dir direction)
{
u8 opcode;
int cnt;
opcode = NFP_NET_CRYPTO_OP_TLS_1_2_AES_GCM_128_ENC;
nn->ktls_tx_conn_cnt += add;
cnt = nn->ktls_tx_conn_cnt;
nn->dp.ktls_tx = !!nn->ktls_tx_conn_cnt;
/* Care only about 0 -> 1 and 1 -> 0 transitions */
if (cnt > 1)
return false;
nfp_net_crypto_set_op(nn, opcode, cnt);
return true;
}
static int
nfp_net_tls_conn_cnt_changed(struct nfp_net *nn, int add,
enum tls_offload_ctx_dir direction)
{
int ret = 0;
/* Use the BAR lock to protect the connection counts */
nn_ctrl_bar_lock(nn);
if (__nfp_net_tls_conn_cnt_changed(nn, add, direction)) {
ret = __nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_CRYPTO);
/* Undo the cnt adjustment if failed */
if (ret)
__nfp_net_tls_conn_cnt_changed(nn, -add, direction);
}
nn_ctrl_bar_unlock(nn);
return ret;
}
static int
nfp_net_tls_conn_add(struct nfp_net *nn, enum tls_offload_ctx_dir direction)
{
return nfp_net_tls_conn_cnt_changed(nn, 1, direction);
}
static int
nfp_net_tls_conn_remove(struct nfp_net *nn, enum tls_offload_ctx_dir direction)
{
return nfp_net_tls_conn_cnt_changed(nn, -1, direction);
}
static struct sk_buff *
nfp_net_tls_alloc_simple(struct nfp_net *nn, size_t req_sz, gfp_t flags)
{
return nfp_ccm_mbox_alloc(nn, req_sz,
sizeof(struct nfp_crypto_reply_simple),
flags);
}
static int
nfp_net_tls_communicate_simple(struct nfp_net *nn, struct sk_buff *skb,
const char *name, enum nfp_ccm_type type)
{
struct nfp_crypto_reply_simple *reply;
int err;
err = nfp_ccm_mbox_communicate(nn, skb, type,
sizeof(*reply), sizeof(*reply));
if (err) {
nn_dp_warn(&nn->dp, "failed to %s TLS: %d\n", name, err);
return err;
}
reply = (void *)skb->data;
err = -be32_to_cpu(reply->error);
if (err)
nn_dp_warn(&nn->dp, "failed to %s TLS, fw replied: %d\n",
name, err);
dev_consume_skb_any(skb);
return err;
}
static void nfp_net_tls_del_fw(struct nfp_net *nn, __be32 *fw_handle)
{
struct nfp_crypto_req_del *req;
struct sk_buff *skb;
skb = nfp_net_tls_alloc_simple(nn, sizeof(*req), GFP_KERNEL);
if (!skb)
return;
req = (void *)skb->data;
req->ep_id = 0;
memcpy(req->handle, fw_handle, sizeof(req->handle));
nfp_net_tls_communicate_simple(nn, skb, "delete",
NFP_CCM_TYPE_CRYPTO_DEL);
}
static struct nfp_crypto_req_add_back *
nfp_net_tls_set_ipv4(struct nfp_crypto_req_add_v4 *req, struct sock *sk,
int direction)
{
struct inet_sock *inet = inet_sk(sk);
req->front.key_len += sizeof(__be32) * 2;
req->front.ipver_vlan = cpu_to_be16(FIELD_PREP(NFP_NET_TLS_IPVER, 4) |
FIELD_PREP(NFP_NET_TLS_VLAN,
NFP_NET_TLS_VLAN_UNUSED));
if (direction == TLS_OFFLOAD_CTX_DIR_TX) {
req->src_ip = inet->inet_saddr;
req->dst_ip = inet->inet_daddr;
} else {
req->src_ip = inet->inet_daddr;
req->dst_ip = inet->inet_saddr;
}
return &req->back;
}
static struct nfp_crypto_req_add_back *
nfp_net_tls_set_ipv6(struct nfp_crypto_req_add_v6 *req, struct sock *sk,
int direction)
{
#if IS_ENABLED(CONFIG_IPV6)
struct ipv6_pinfo *np = inet6_sk(sk);
req->front.key_len += sizeof(struct in6_addr) * 2;
req->front.ipver_vlan = cpu_to_be16(FIELD_PREP(NFP_NET_TLS_IPVER, 6) |
FIELD_PREP(NFP_NET_TLS_VLAN,
NFP_NET_TLS_VLAN_UNUSED));
if (direction == TLS_OFFLOAD_CTX_DIR_TX) {
memcpy(req->src_ip, &np->saddr, sizeof(req->src_ip));
memcpy(req->dst_ip, &sk->sk_v6_daddr, sizeof(req->dst_ip));
} else {
memcpy(req->src_ip, &sk->sk_v6_daddr, sizeof(req->src_ip));
memcpy(req->dst_ip, &np->saddr, sizeof(req->dst_ip));
}
#endif
return &req->back;
}
static void
nfp_net_tls_set_l4(struct nfp_crypto_req_add_front *front,
struct nfp_crypto_req_add_back *back, struct sock *sk,
int direction)
{
struct inet_sock *inet = inet_sk(sk);
front->l4_proto = IPPROTO_TCP;
if (direction == TLS_OFFLOAD_CTX_DIR_TX) {
back->src_port = inet->inet_sport;
back->dst_port = inet->inet_dport;
} else {
back->src_port = inet->inet_dport;
back->dst_port = inet->inet_sport;
}
}
static u8 nfp_tls_1_2_dir_to_opcode(enum tls_offload_ctx_dir direction)
{
switch (direction) {
case TLS_OFFLOAD_CTX_DIR_TX:
return NFP_NET_CRYPTO_OP_TLS_1_2_AES_GCM_128_ENC;
case TLS_OFFLOAD_CTX_DIR_RX:
return NFP_NET_CRYPTO_OP_TLS_1_2_AES_GCM_128_DEC;
default:
WARN_ON_ONCE(1);
return 0;
}
}
static bool
nfp_net_cipher_supported(struct nfp_net *nn, u16 cipher_type,
enum tls_offload_ctx_dir direction)
{
u8 bit;
switch (cipher_type) {
case TLS_CIPHER_AES_GCM_128:
if (direction == TLS_OFFLOAD_CTX_DIR_TX)
bit = NFP_NET_CRYPTO_OP_TLS_1_2_AES_GCM_128_ENC;
else
return false;
break;
default:
return false;
}
return nn->tlv_caps.crypto_ops & BIT(bit);
}
static int
nfp_net_tls_add(struct net_device *netdev, struct sock *sk,
enum tls_offload_ctx_dir direction,
struct tls_crypto_info *crypto_info,
u32 start_offload_tcp_sn)
{
struct tls12_crypto_info_aes_gcm_128 *tls_ci;
struct nfp_net *nn = netdev_priv(netdev);
struct nfp_crypto_req_add_front *front;
struct nfp_net_tls_offload_ctx *ntls;
struct nfp_crypto_req_add_back *back;
struct nfp_crypto_reply_add *reply;
struct sk_buff *skb;
size_t req_sz;
bool ipv6;
int err;
BUILD_BUG_ON(sizeof(struct nfp_net_tls_offload_ctx) >
TLS_DRIVER_STATE_SIZE_TX);
if (!nfp_net_cipher_supported(nn, crypto_info->cipher_type, direction))
return -EOPNOTSUPP;
switch (sk->sk_family) {
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
if (sk->sk_ipv6only ||
ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) {
req_sz = sizeof(struct nfp_crypto_req_add_v6);
ipv6 = true;
break;
}
#endif
/* fall through */
case AF_INET:
req_sz = sizeof(struct nfp_crypto_req_add_v4);
ipv6 = false;
break;
default:
return -EOPNOTSUPP;
}
err = nfp_net_tls_conn_add(nn, direction);
if (err)
return err;
skb = nfp_ccm_mbox_alloc(nn, req_sz, sizeof(*reply), GFP_KERNEL);
if (!skb) {
err = -ENOMEM;
goto err_conn_remove;
}
front = (void *)skb->data;
front->ep_id = 0;
front->key_len = 8;
front->opcode = nfp_tls_1_2_dir_to_opcode(direction);
memset(front->resv, 0, sizeof(front->resv));
if (ipv6)
back = nfp_net_tls_set_ipv6((void *)skb->data, sk, direction);
else
back = nfp_net_tls_set_ipv4((void *)skb->data, sk, direction);
nfp_net_tls_set_l4(front, back, sk, direction);
back->counter = 0;
back->tcp_seq = cpu_to_be32(start_offload_tcp_sn);
tls_ci = (struct tls12_crypto_info_aes_gcm_128 *)crypto_info;
memcpy(back->key, tls_ci->key, TLS_CIPHER_AES_GCM_128_KEY_SIZE);
memset(&back->key[TLS_CIPHER_AES_GCM_128_KEY_SIZE / 4], 0,
sizeof(back->key) - TLS_CIPHER_AES_GCM_128_KEY_SIZE);
memcpy(back->iv, tls_ci->iv, TLS_CIPHER_AES_GCM_128_IV_SIZE);
memcpy(&back->salt, tls_ci->salt, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
memcpy(back->rec_no, tls_ci->rec_seq, sizeof(tls_ci->rec_seq));
err = nfp_ccm_mbox_communicate(nn, skb, NFP_CCM_TYPE_CRYPTO_ADD,
sizeof(*reply), sizeof(*reply));
if (err) {
nn_dp_warn(&nn->dp, "failed to add TLS: %d\n", err);
/* communicate frees skb on error */
goto err_conn_remove;
}
reply = (void *)skb->data;
err = -be32_to_cpu(reply->error);
if (err) {
if (err == -ENOSPC) {
if (!atomic_fetch_inc(&nn->ktls_no_space))
nn_info(nn, "HW TLS table full\n");
} else {
nn_dp_warn(&nn->dp,
"failed to add TLS, FW replied: %d\n", err);
}
goto err_free_skb;
}
if (!reply->handle[0] && !reply->handle[1]) {
nn_dp_warn(&nn->dp, "FW returned NULL handle\n");
goto err_fw_remove;
}
ntls = tls_driver_ctx(sk, direction);
memcpy(ntls->fw_handle, reply->handle, sizeof(ntls->fw_handle));
ntls->next_seq = start_offload_tcp_sn;
dev_consume_skb_any(skb);
return 0;
err_fw_remove:
nfp_net_tls_del_fw(nn, reply->handle);
err_free_skb:
dev_consume_skb_any(skb);
err_conn_remove:
nfp_net_tls_conn_remove(nn, direction);
return err;
}
static void
nfp_net_tls_del(struct net_device *netdev, struct tls_context *tls_ctx,
enum tls_offload_ctx_dir direction)
{
struct nfp_net *nn = netdev_priv(netdev);
struct nfp_net_tls_offload_ctx *ntls;
nfp_net_tls_conn_remove(nn, direction);
ntls = __tls_driver_ctx(tls_ctx, direction);
nfp_net_tls_del_fw(nn, ntls->fw_handle);
}
static const struct tlsdev_ops nfp_net_tls_ops = {
.tls_dev_add = nfp_net_tls_add,
.tls_dev_del = nfp_net_tls_del,
};
static int nfp_net_tls_reset(struct nfp_net *nn)
{
struct nfp_crypto_req_reset *req;
struct sk_buff *skb;
skb = nfp_net_tls_alloc_simple(nn, sizeof(*req), GFP_KERNEL);
if (!skb)
return -ENOMEM;
req = (void *)skb->data;
req->ep_id = 0;
return nfp_net_tls_communicate_simple(nn, skb, "reset",
NFP_CCM_TYPE_CRYPTO_RESET);
}
int nfp_net_tls_init(struct nfp_net *nn)
{
struct net_device *netdev = nn->dp.netdev;
int err;
if (!(nn->tlv_caps.crypto_ops & NFP_NET_TLS_OPCODE_MASK))
return 0;
if ((nn->tlv_caps.mbox_cmsg_types & NFP_NET_TLS_CCM_MBOX_OPS_MASK) !=
NFP_NET_TLS_CCM_MBOX_OPS_MASK)
return 0;
if (!nfp_ccm_mbox_fits(nn, sizeof(struct nfp_crypto_req_add_v6))) {
nn_warn(nn, "disabling TLS offload - mbox too small: %d\n",
nn->tlv_caps.mbox_len);
return 0;
}
err = nfp_net_tls_reset(nn);
if (err)
return err;
nn_ctrl_bar_lock(nn);
nn_writel(nn, nn->tlv_caps.crypto_enable_off, 0);
err = __nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_CRYPTO);
nn_ctrl_bar_unlock(nn);
if (err)
return err;
if (nn->tlv_caps.crypto_ops & NFP_NET_TLS_OPCODE_MASK_TX) {
netdev->hw_features |= NETIF_F_HW_TLS_TX;
netdev->features |= NETIF_F_HW_TLS_TX;
}
netdev->tlsdev_ops = &nfp_net_tls_ops;
return 0;
}