1 /* 2 * Copyright (c) 2018 Simon Goldschmidt 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without modification, 6 * are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 19 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 21 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 25 * OF SUCH DAMAGE. 26 * 27 * Author: Simon Goldschmidt <goldsimon@gmx.de> 28 * 29 * To use the hooks in this file, make sure this file is included in LWIP_HOOK_FILENAME 30 * and define these hooks: 31 * 32 * #define LWIP_HOOK_TCP_INPACKET_PCB(pcb, hdr, optlen, opt1len, opt2, p) tcp_md5_check_inpacket(pcb, hdr, optlen, opt1len, opt2, p) 33 * #define LWIP_HOOK_TCP_OPT_LENGTH_SEGMENT(pcb, internal_len) tcp_md5_get_additional_option_length(pcb, internal_len) 34 * #define LWIP_HOOK_TCP_ADD_TX_OPTIONS(p, hdr, pcb, opts) tcp_md5_add_tx_options(p, hdr, pcb, opts) 35 * 36 * #define LWIP_HOOK_SOCKETS_SETSOCKOPT(s, sock, level, optname, optval, optlen, err) tcp_md5_setsockopt_hook(sock, level, optname, optval, optlen, err) 37 */ 38 39 #ifndef LWIP_HDR_CONTRIB_ADDONS_TCP_MD5_H 40 #define LWIP_HDR_CONTRIB_ADDONS_TCP_MD5_H 41 42 #include "lwip/opt.h" 43 #include "lwip/ip_addr.h" 44 #include "lwip/err.h" 45 46 #include "lwip/priv/sockets_priv.h" 47 #include "lwip/priv/tcp_priv.h" 48 49 #ifdef __cplusplus 50 extern "C" { 51 #endif 52 53 /* setsockopt definitions and structs: */ 54 55 /* This is the optname (for level = IPPROTO_TCP) */ 56 #ifndef TCP_MD5SIG 57 #define TCP_MD5SIG 14 58 #endif 59 60 #define TCP_MD5SIG_MAXKEYLEN 80 61 62 /* This is the optval type */ 63 struct tcp_md5sig { 64 struct sockaddr_storage tcpm_addr; 65 u16_t __tcpm_pad1; 66 u16_t tcpm_keylen; 67 u32_t __tcpm_pad2; 68 u8_t tcpm_key[TCP_MD5SIG_MAXKEYLEN]; 69 }; 70 71 /* socket setsockopt hook: */ 72 int tcp_md5_setsockopt_hook(struct lwip_sock *sock, int level, int optname, const void *optval, u32_t optlen, int *err); 73 74 /* Internal hook functions */ 75 void tcp_md5_init(void); 76 err_t tcp_md5_check_inpacket(struct tcp_pcb* pcb, struct tcp_hdr *hdr, u16_t optlen, u16_t opt1len, u8_t *opt2, struct pbuf *p); 77 u8_t tcp_md5_get_additional_option_length(const struct tcp_pcb *pcb, u8_t internal_option_length); 78 u32_t *tcp_md5_add_tx_options(struct pbuf *p, struct tcp_hdr *hdr, const struct tcp_pcb *pcb, u32_t *opts); 79 80 #ifdef __cplusplus 81 } 82 #endif 83 84 #endif /* LWIP_HDR_CONTRIB_ADDONS_TCP_MD5_H */ 85