111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Handle the TLS Alert protocol
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*
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* Author: Chuck Lever <chuck.lever@oracle.com>
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*
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* Copyright (c) 2023, Oracle and/or its affiliates.
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*/
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/inet.h>
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#include <net/sock.h>
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#include <net/handshake.h>
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#include <net/tls.h>
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#include <net/tls_prot.h>
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#include "handshake.h"
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#include <trace/events/handshake.h>
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/**
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* tls_alert_send - send a TLS Alert on a kTLS socket
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* @sock: open kTLS socket to send on
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* @level: TLS Alert level
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* @description: TLS Alert description
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*
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* Returns zero on success or a negative errno.
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*/
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int tls_alert_send(struct socket *sock, u8 level, u8 description)
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{
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u8 record_type = TLS_RECORD_TYPE_ALERT;
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u8 buf[CMSG_SPACE(sizeof(record_type))];
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struct msghdr msg = { 0 };
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struct cmsghdr *cmsg;
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struct kvec iov;
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u8 alert[2];
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int ret;
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trace_tls_alert_send(sock->sk, level, description);
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alert[0] = level;
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alert[1] = description;
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iov.iov_base = alert;
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iov.iov_len = sizeof(alert);
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memset(buf, 0, sizeof(buf));
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msg.msg_control = buf;
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msg.msg_controllen = sizeof(buf);
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msg.msg_flags = MSG_DONTWAIT;
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cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_level = SOL_TLS;
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cmsg->cmsg_type = TLS_SET_RECORD_TYPE;
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cmsg->cmsg_len = CMSG_LEN(sizeof(record_type));
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memcpy(CMSG_DATA(cmsg), &record_type, sizeof(record_type));
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iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, &iov, 1, iov.iov_len);
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ret = sock_sendmsg(sock, &msg);
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return ret < 0 ? ret : 0;
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}
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/**
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* tls_get_record_type - Look for TLS RECORD_TYPE information
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* @sk: socket (for IP address information)
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* @cmsg: incoming message to be parsed
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*
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* Returns zero or a TLS_RECORD_TYPE value.
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*/
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u8 tls_get_record_type(const struct sock *sk, const struct cmsghdr *cmsg)
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{
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u8 record_type;
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if (cmsg->cmsg_level != SOL_TLS)
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return 0;
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if (cmsg->cmsg_type != TLS_GET_RECORD_TYPE)
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return 0;
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record_type = *((u8 *)CMSG_DATA(cmsg));
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trace_tls_contenttype(sk, record_type);
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return record_type;
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}
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EXPORT_SYMBOL(tls_get_record_type);
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/**
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* tls_alert_recv - Parse TLS Alert messages
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* @sk: socket (for IP address information)
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* @msg: incoming message to be parsed
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* @level: OUT - TLS AlertLevel value
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* @description: OUT - TLS AlertDescription value
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*
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*/
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void tls_alert_recv(const struct sock *sk, const struct msghdr *msg,
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u8 *level, u8 *description)
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{
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const struct kvec *iov;
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u8 *data;
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iov = msg->msg_iter.kvec;
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data = iov->iov_base;
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*level = data[0];
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*description = data[1];
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trace_tls_alert_recv(sk, *level, *description);
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}
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EXPORT_SYMBOL(tls_alert_recv);
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