diff options
| -rw-r--r-- | drivers/crypto/chelsio/chtls/chtls_main.c | 575 |
1 files changed, 575 insertions, 0 deletions
diff --git a/drivers/crypto/chelsio/chtls/chtls_main.c b/drivers/crypto/chelsio/chtls/chtls_main.c new file mode 100644 index 000000000000..04b316f86ebd --- /dev/null +++ b/drivers/crypto/chelsio/chtls/chtls_main.c @@ -0,0 +1,575 @@ +/* + * Copyright (c) 2018 Chelsio Communications, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Written by: Atul Gupta (atul.gupta@chelsio.com) + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/skbuff.h> +#include <linux/socket.h> +#include <linux/hash.h> +#include <linux/in.h> +#include <linux/net.h> +#include <linux/ip.h> +#include <linux/tcp.h> +#include <net/tcp.h> +#include <net/tls.h> + +#include "chtls.h" +#include "chtls_cm.h" + +#define DRV_NAME "chtls" + +/* + * chtls device management + * maintains a list of the chtls devices + */ +static LIST_HEAD(cdev_list); +static DEFINE_MUTEX(cdev_mutex); +static DEFINE_MUTEX(cdev_list_lock); + +static DEFINE_MUTEX(notify_mutex); +static RAW_NOTIFIER_HEAD(listen_notify_list); +static struct proto chtls_cpl_prot; +struct request_sock_ops chtls_rsk_ops; +static uint send_page_order = (14 - PAGE_SHIFT < 0) ? 0 : 14 - PAGE_SHIFT; + +static void register_listen_notifier(struct notifier_block *nb) +{ + mutex_lock(¬ify_mutex); + raw_notifier_chain_register(&listen_notify_list, nb); + mutex_unlock(¬ify_mutex); +} + +static void unregister_listen_notifier(struct notifier_block *nb) +{ + mutex_lock(¬ify_mutex); + raw_notifier_chain_unregister(&listen_notify_list, nb); + mutex_unlock(¬ify_mutex); +} + +static int listen_notify_handler(struct notifier_block *this, + unsigned long event, void *data) +{ + struct chtls_dev *cdev; + struct sock *sk; + int ret; + + sk = data; + ret = NOTIFY_DONE; + + switch (event) { + case CHTLS_LISTEN_START: + case CHTLS_LISTEN_STOP: + mutex_lock(&cdev_list_lock); + list_for_each_entry(cdev, &cdev_list, list) { + if (event == CHTLS_LISTEN_START) + ret = chtls_listen_start(cdev, sk); + else + chtls_listen_stop(cdev, sk); + } + mutex_unlock(&cdev_list_lock); + break; + } + return ret; +} + +static struct notifier_block listen_notifier = { + .notifier_call = listen_notify_handler +}; + +static int listen_backlog_rcv(struct sock *sk, struct sk_buff *skb) +{ + if (likely(skb_transport_header(skb) != skb_network_header(skb))) + return tcp_v4_do_rcv(sk, skb); + BLOG_SKB_CB(skb)->backlog_rcv(sk, skb); + return 0; +} + +static int chtls_start_listen(struct sock *sk) +{ + int err; + + if (sk->sk_protocol != IPPROTO_TCP) + return -EPROTONOSUPPORT; + + if (sk->sk_family == PF_INET && + LOOPBACK(inet_sk(sk)->inet_rcv_saddr)) + return -EADDRNOTAVAIL; + + sk->sk_backlog_rcv = listen_backlog_rcv; + mutex_lock(¬ify_mutex); + err = raw_notifier_call_chain(&listen_notify_list, + CHTLS_LISTEN_START, sk); + mutex_unlock(¬ify_mutex); + return err; +} + +static void chtls_stop_listen(struct sock *sk) +{ + if (sk->sk_protocol != IPPROTO_TCP) + return; + + mutex_lock(¬ify_mutex); + raw_notifier_call_chain(&listen_notify_list, + CHTLS_LISTEN_STOP, sk); + mutex_unlock(¬ify_mutex); +} + +static int chtls_inline_feature(struct tls_device *dev) +{ + struct net_device *netdev; + struct chtls_dev *cdev; + int i; + + cdev = to_chtls_dev(dev); + + for (i = 0; i < cdev->lldi->nports; i++) { + netdev = cdev->ports[i]; + if (netdev->features & NETIF_F_HW_TLS_RECORD) + return 1; + } + return 0; +} + +static int chtls_create_hash(struct tls_device *dev, struct sock *sk) +{ + if (sk->sk_state == TCP_LISTEN) + return chtls_start_listen(sk); + return 0; +} + +static void chtls_destroy_hash(struct tls_device *dev, struct sock *sk) +{ + if (sk->sk_state == TCP_LISTEN) + chtls_stop_listen(sk); +} + +static void chtls_register_dev(struct chtls_dev *cdev) +{ + struct tls_device *tlsdev = &cdev->tlsdev; + + strlcpy(tlsdev->name, "chtls", TLS_DEVICE_NAME_MAX); + strlcat(tlsdev->name, cdev->lldi->ports[0]->name, + TLS_DEVICE_NAME_MAX); + tlsdev->feature = chtls_inline_feature; + tlsdev->hash = chtls_create_hash; + tlsdev->unhash = chtls_destroy_hash; + tls_register_device(&cdev->tlsdev); +} + +static void chtls_unregister_dev(struct chtls_dev *cdev) +{ + tls_unregister_device(&cdev->tlsdev); +} + +static void process_deferq(struct work_struct *task_param) +{ + struct chtls_dev *cdev = container_of(task_param, + struct chtls_dev, deferq_task); + struct sk_buff *skb; + + spin_lock_bh(&cdev->deferq.lock); + while ((skb = __skb_dequeue(&cdev->deferq)) != NULL) { + spin_unlock_bh(&cdev->deferq.lock); + DEFERRED_SKB_CB(skb)->handler(cdev, skb); + spin_lock_bh(&cdev->deferq.lock); + } + spin_unlock_bh(&cdev->deferq.lock); +} + +static int chtls_get_skb(struct chtls_dev *cdev) +{ + cdev->askb = alloc_skb(sizeof(struct tcphdr), GFP_KERNEL); + if (!cdev->askb) + return -ENOMEM; + + skb_put(cdev->askb, sizeof(struct tcphdr)); + skb_reset_transport_header(cdev->askb); + memset(cdev->askb->data, 0, cdev->askb->len); + return 0; +} + +static void *chtls_uld_add(const struct cxgb4_lld_info *info) +{ + struct cxgb4_lld_info *lldi; + struct chtls_dev *cdev; + int i, j; + + cdev = kzalloc(sizeof(*cdev) + info->nports * + (sizeof(struct net_device *)), GFP_KERNEL); + if (!cdev) + goto out; + + lldi = kzalloc(sizeof(*lldi), GFP_KERNEL); + if (!lldi) + goto out_lldi; + + if (chtls_get_skb(cdev)) + goto out_skb; + + *lldi = *info; + cdev->lldi = lldi; + cdev->pdev = lldi->pdev; + cdev->tids = lldi->tids; + cdev->ports = (struct net_device **)(cdev + 1); + cdev->ports = lldi->ports; + cdev->mtus = lldi->mtus; + cdev->tids = lldi->tids; + cdev->pfvf = FW_VIID_PFN_G(cxgb4_port_viid(lldi->ports[0])) + << FW_VIID_PFN_S; + + for (i = 0; i < (1 << RSPQ_HASH_BITS); i++) { + unsigned int size = 64 - sizeof(struct rsp_ctrl) - 8; + + cdev->rspq_skb_cache[i] = __alloc_skb(size, + gfp_any(), 0, + lldi->nodeid); + if (unlikely(!cdev->rspq_skb_cache[i])) + goto out_rspq_skb; + } + + idr_init(&cdev->hwtid_idr); + INIT_WORK(&cdev->deferq_task, process_deferq); + spin_lock_init(&cdev->listen_lock); + spin_lock_init(&cdev->idr_lock); + cdev->send_page_order = min_t(uint, get_order(32768), + send_page_order); + + if (lldi->vr->key.size) + if (chtls_init_kmap(cdev, lldi)) + goto out_rspq_skb; + + mutex_lock(&cdev_mutex); + list_add_tail(&cdev->list, &cdev_list); + mutex_unlock(&cdev_mutex); + + return cdev; +out_rspq_skb: + for (j = 0; j <= i; j++) + kfree_skb(cdev->rspq_skb_cache[j]); + kfree_skb(cdev->askb); +out_skb: + kfree(lldi); +out_lldi: + kfree(cdev); +out: + return NULL; +} + +static void chtls_free_uld(struct chtls_dev *cdev) +{ + int i; + + chtls_unregister_dev(cdev); + kvfree(cdev->kmap.addr); + idr_destroy(&cdev->hwtid_idr); + for (i = 0; i < (1 << RSPQ_HASH_BITS); i++) + kfree_skb(cdev->rspq_skb_cache[i]); + kfree(cdev->lldi); + if (cdev->askb) + kfree_skb(cdev->askb); + kfree(cdev); +} + +static void chtls_free_all_uld(void) +{ + struct chtls_dev *cdev, *tmp; + + mutex_lock(&cdev_mutex); + list_for_each_entry_safe(cdev, tmp, &cdev_list, list) + chtls_free_uld(cdev); + mutex_unlock(&cdev_mutex); +} + +static int chtls_uld_state_change(void *handle, enum cxgb4_state new_state) +{ + struct chtls_dev *cdev = handle; + + switch (new_state) { + case CXGB4_STATE_UP: + chtls_register_dev(cdev); + break; + case CXGB4_STATE_DOWN: + break; + case CXGB4_STATE_START_RECOVERY: + break; + case CXGB4_STATE_DETACH: + mutex_lock(&cdev_mutex); + list_del(&cdev->list); + mutex_unlock(&cdev_mutex); + chtls_free_uld(cdev); + break; + default: + break; + } + return 0; +} + +static struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl, + const __be64 *rsp, + u32 pktshift) +{ + struct sk_buff *skb; + + /* Allocate space for cpl_pass_accpet_req which will be synthesized by + * driver. Once driver synthesizes cpl_pass_accpet_req the skb will go + * through the regular cpl_pass_accept_req processing in TOM. + */ + skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) + - pktshift, GFP_ATOMIC); + if (unlikely(!skb)) + return NULL; + __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) + - pktshift); + /* For now we will copy cpl_rx_pkt in the skb */ + skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_rx_pkt)); + skb_copy_to_linear_data_offset(skb, sizeof(struct cpl_pass_accept_req) + , gl->va + pktshift, + gl->tot_len - pktshift); + + return skb; +} + +static int chtls_recv_packet(struct chtls_dev *cdev, + const struct pkt_gl *gl, const __be64 *rsp) +{ + unsigned int opcode = *(u8 *)rsp; + struct sk_buff *skb; + int ret; + + skb = copy_gl_to_skb_pkt(gl, rsp, cdev->lldi->sge_pktshift); + if (!skb) + return -ENOMEM; + + ret = chtls_handlers[opcode](cdev, skb); + if (ret & CPL_RET_BUF_DONE) + kfree_skb(skb); + + return 0; +} + +static int chtls_recv_rsp(struct chtls_dev *cdev, const __be64 *rsp) +{ + unsigned long rspq_bin; + unsigned int opcode; + struct sk_buff *skb; + unsigned int len; + int ret; + + len = 64 - sizeof(struct rsp_ctrl) - 8; + opcode = *(u8 *)rsp; + + rspq_bin = hash_ptr((void *)rsp, RSPQ_HASH_BITS); + skb = cdev->rspq_skb_cache[rspq_bin]; + if (skb && !skb_is_nonlinear(skb) && + !skb_shared(skb) && !skb_cloned(skb)) { + refcount_inc(&skb->users); + if (refcount_read(&skb->users) == 2) { + __skb_trim(skb, 0); + if (skb_tailroom(skb) >= len) + goto copy_out; + } + refcount_dec(&skb->users); + } + skb = alloc_skb(len, GFP_ATOMIC); + if (unlikely(!skb)) + return -ENOMEM; + +copy_out: + __skb_put(skb, len); + skb_copy_to_linear_data(skb, rsp, len); + skb_reset_network_header(skb); + skb_reset_transport_header(skb); + ret = chtls_handlers[opcode](cdev, skb); + + if (ret & CPL_RET_BUF_DONE) + kfree_skb(skb); + return 0; +} + +static void chtls_recv(struct chtls_dev *cdev, + struct sk_buff **skbs, const __be64 *rsp) +{ + struct sk_buff *skb = *skbs; + unsigned int opcode; + int ret; + + opcode = *(u8 *)rsp; + + __skb_push(skb, sizeof(struct rss_header)); + skb_copy_to_linear_data(skb, rsp, sizeof(struct rss_header)); + + ret = chtls_handlers[opcode](cdev, skb); + if (ret & CPL_RET_BUF_DONE) + kfree_skb(skb); +} + +static int chtls_uld_rx_handler(void *handle, const __be64 *rsp, + const struct pkt_gl *gl) +{ + struct chtls_dev *cdev = handle; + unsigned int opcode; + struct sk_buff *skb; + + opcode = *(u8 *)rsp; + + if (unlikely(opcode == CPL_RX_PKT)) { + if (chtls_recv_packet(cdev, gl, rsp) < 0) + goto nomem; + return 0; + } + + if (!gl) + return chtls_recv_rsp(cdev, rsp); + +#define RX_PULL_LEN 128 + skb = cxgb4_pktgl_to_skb(gl, RX_PULL_LEN, RX_PULL_LEN); + if (unlikely(!skb)) + goto nomem; + chtls_recv(cdev, &skb, rsp); + return 0; + +nomem: + return -ENOMEM; +} + +static int do_chtls_getsockopt(struct sock *sk, char __user *optval, + int __user *optlen) +{ + struct tls_crypto_info crypto_info; + + crypto_info.version = TLS_1_2_VERSION; + if (copy_to_user(optval, &crypto_info, sizeof(struct tls_crypto_info))) + return -EFAULT; + return 0; +} + +static int chtls_getsockopt(struct sock *sk, int level, int optname, + char __user *optval, int __user *optlen) +{ + struct tls_context *ctx = tls_get_ctx(sk); + + if (level != SOL_TLS) + return ctx->getsockopt(sk, level, optname, optval, optlen); + + return do_chtls_getsockopt(sk, optval, optlen); +} + +static int do_chtls_setsockopt(struct sock *sk, int optname, + char __user *optval, unsigned int optlen) +{ + struct tls_crypto_info *crypto_info, tmp_crypto_info; + struct chtls_sock *csk; + int keylen; + int rc = 0; + + csk = rcu_dereference_sk_user_data(sk); + + if (!optval || optlen < sizeof(*crypto_info)) { + rc = -EINVAL; + goto out; + } + + rc = copy_from_user(&tmp_crypto_info, optval, sizeof(*crypto_info)); + if (rc) { + rc = -EFAULT; + goto out; + } + + /* check version */ + if (tmp_crypto_info.version != TLS_1_2_VERSION) { + rc = -ENOTSUPP; + goto out; + } + + crypto_info = (struct tls_crypto_info *)&csk->tlshws.crypto_info; + + switch (tmp_crypto_info.cipher_type) { + case TLS_CIPHER_AES_GCM_128: { + rc = copy_from_user(crypto_info, optval, + sizeof(struct + tls12_crypto_info_aes_gcm_128)); + + if (rc) { + rc = -EFAULT; + goto out; + } + + keylen = TLS_CIPHER_AES_GCM_128_KEY_SIZE; + rc = chtls_setkey(csk, keylen, optname); + break; + } + default: + rc = -EINVAL; + goto out; + } +out: + return rc; +} + +static int chtls_setsockopt(struct sock *sk, int level, int optname, + char __user *optval, unsigned int optlen) +{ + struct tls_context *ctx = tls_get_ctx(sk); + + if (level != SOL_TLS) + return ctx->setsockopt(sk, level, optname, optval, optlen); + + return do_chtls_setsockopt(sk, optname, optval, optlen); +} + +static struct cxgb4_uld_info chtls_uld_info = { + .name = DRV_NAME, + .nrxq = MAX_ULD_QSETS, + .ntxq = MAX_ULD_QSETS, + .rxq_size = 1024, + .add = chtls_uld_add, + .state_change = chtls_uld_state_change, + .rx_handler = chtls_uld_rx_handler, +}; + +void chtls_install_cpl_ops(struct sock *sk) +{ + sk->sk_prot = &chtls_cpl_prot; +} + +static void __init chtls_init_ulp_ops(void) +{ + chtls_cpl_prot = tcp_prot; + chtls_init_rsk_ops(&chtls_cpl_prot, &chtls_rsk_ops, + &tcp_prot, PF_INET); + chtls_cpl_prot.close = chtls_close; + chtls_cpl_prot.disconnect = chtls_disconnect; + chtls_cpl_prot.destroy = chtls_destroy_sock; + chtls_cpl_prot.shutdown = chtls_shutdown; + chtls_cpl_prot.setsockopt = chtls_setsockopt; + chtls_cpl_prot.getsockopt = chtls_getsockopt; +} + +static int __init chtls_register(void) +{ + chtls_init_ulp_ops(); + register_listen_notifier(&listen_notifier); + cxgb4_register_uld(CXGB4_ULD_TLS, &chtls_uld_info); + return 0; +} + +static void __exit chtls_unregister(void) +{ + unregister_listen_notifier(&listen_notifier); + chtls_free_all_uld(); + cxgb4_unregister_uld(CXGB4_ULD_TLS); +} + +module_init(chtls_register); +module_exit(chtls_unregister); + +MODULE_DESCRIPTION("Chelsio TLS Inline driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Chelsio Communications"); +MODULE_VERSION(DRV_VERSION); |