1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Definitions for inet_sock 7 * 8 * Authors: Many, reorganised here by 9 * Arnaldo Carvalho de Melo <acme@mandriva.com> 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 */ 16 #ifndef _INET_SOCK_H 17 #define _INET_SOCK_H 18 19 #include <linux/config.h> 20 21 #include <linux/string.h> 22 #include <linux/types.h> 23 24 #include <net/flow.h> 25 #include <net/sock.h> 26 #include <net/request_sock.h> 27 28 /** struct ip_options - IP Options 29 * 30 * @faddr - Saved first hop address 31 * @is_setbyuser - Set by setsockopt? 32 * @is_data - Options in __data, rather than skb 33 * @is_strictroute - Strict source route 34 * @srr_is_hit - Packet destination addr was our one 35 * @is_changed - IP checksum more not valid 36 * @rr_needaddr - Need to record addr of outgoing dev 37 * @ts_needtime - Need to record timestamp 38 * @ts_needaddr - Need to record addr of outgoing dev 39 */ 40 struct ip_options { 41 __u32 faddr; 42 unsigned char optlen; 43 unsigned char srr; 44 unsigned char rr; 45 unsigned char ts; 46 unsigned char is_setbyuser:1, 47 is_data:1, 48 is_strictroute:1, 49 srr_is_hit:1, 50 is_changed:1, 51 rr_needaddr:1, 52 ts_needtime:1, 53 ts_needaddr:1; 54 unsigned char router_alert; 55 unsigned char __pad1; 56 unsigned char __pad2; 57 unsigned char __data[0]; 58 }; 59 60 #define optlength(opt) (sizeof(struct ip_options) + opt->optlen) 61 62 struct inet_request_sock { 63 struct request_sock req; 64 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 65 u16 inet6_rsk_offset; 66 /* 2 bytes hole, try to pack */ 67 #endif 68 u32 loc_addr; 69 u32 rmt_addr; 70 u16 rmt_port; 71 u16 snd_wscale : 4, 72 rcv_wscale : 4, 73 tstamp_ok : 1, 74 sack_ok : 1, 75 wscale_ok : 1, 76 ecn_ok : 1, 77 acked : 1; 78 struct ip_options *opt; 79 }; 80 81 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) 82 { 83 return (struct inet_request_sock *)sk; 84 } 85 86 struct ip_mc_socklist; 87 struct ipv6_pinfo; 88 struct rtable; 89 90 /** struct inet_sock - representation of INET sockets 91 * 92 * @sk - ancestor class 93 * @pinet6 - pointer to IPv6 control block 94 * @daddr - Foreign IPv4 addr 95 * @rcv_saddr - Bound local IPv4 addr 96 * @dport - Destination port 97 * @num - Local port 98 * @saddr - Sending source 99 * @uc_ttl - Unicast TTL 100 * @sport - Source port 101 * @id - ID counter for DF pkts 102 * @tos - TOS 103 * @mc_ttl - Multicasting TTL 104 * @is_icsk - is this an inet_connection_sock? 105 * @mc_index - Multicast device index 106 * @mc_list - Group array 107 * @cork - info to build ip hdr on each ip frag while socket is corked 108 */ 109 struct inet_sock { 110 /* sk and pinet6 has to be the first two members of inet_sock */ 111 struct sock sk; 112 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 113 struct ipv6_pinfo *pinet6; 114 #endif 115 /* Socket demultiplex comparisons on incoming packets. */ 116 __u32 daddr; 117 __u32 rcv_saddr; 118 __u16 dport; 119 __u16 num; 120 __u32 saddr; 121 __s16 uc_ttl; 122 __u16 cmsg_flags; 123 struct ip_options *opt; 124 __u16 sport; 125 __u16 id; 126 __u8 tos; 127 __u8 mc_ttl; 128 __u8 pmtudisc; 129 __u8 recverr:1, 130 is_icsk:1, 131 freebind:1, 132 hdrincl:1, 133 mc_loop:1; 134 int mc_index; 135 __u32 mc_addr; 136 struct ip_mc_socklist *mc_list; 137 struct { 138 unsigned int flags; 139 unsigned int fragsize; 140 struct ip_options *opt; 141 struct rtable *rt; 142 int length; /* Total length of all frames */ 143 u32 addr; 144 struct flowi fl; 145 } cork; 146 }; 147 148 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 149 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 150 151 static inline struct inet_sock *inet_sk(const struct sock *sk) 152 { 153 return (struct inet_sock *)sk; 154 } 155 156 static inline void __inet_sk_copy_descendant(struct sock *sk_to, 157 const struct sock *sk_from, 158 const int ancestor_size) 159 { 160 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 161 sk_from->sk_prot->obj_size - ancestor_size); 162 } 163 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)) 164 static inline void inet_sk_copy_descendant(struct sock *sk_to, 165 const struct sock *sk_from) 166 { 167 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 168 } 169 #endif 170 171 extern int inet_sk_rebuild_header(struct sock *sk); 172 173 static inline unsigned int inet_ehashfn(const __u32 laddr, const __u16 lport, 174 const __u32 faddr, const __u16 fport) 175 { 176 unsigned int h = (laddr ^ lport) ^ (faddr ^ fport); 177 h ^= h >> 16; 178 h ^= h >> 8; 179 return h; 180 } 181 182 static inline int inet_sk_ehashfn(const struct sock *sk) 183 { 184 const struct inet_sock *inet = inet_sk(sk); 185 const __u32 laddr = inet->rcv_saddr; 186 const __u16 lport = inet->num; 187 const __u32 faddr = inet->daddr; 188 const __u16 fport = inet->dport; 189 190 return inet_ehashfn(laddr, lport, faddr, fport); 191 } 192 193 #endif /* _INET_SOCK_H */ 194