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 20 #include <linux/string.h> 21 #include <linux/types.h> 22 #include <linux/jhash.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_data - Options in __data, rather than skb 32 * @is_strictroute - Strict source route 33 * @srr_is_hit - Packet destination addr was our one 34 * @is_changed - IP checksum more not valid 35 * @rr_needaddr - Need to record addr of outgoing dev 36 * @ts_needtime - Need to record timestamp 37 * @ts_needaddr - Need to record addr of outgoing dev 38 */ 39 struct ip_options { 40 __be32 faddr; 41 unsigned char optlen; 42 unsigned char srr; 43 unsigned char rr; 44 unsigned char ts; 45 unsigned char is_data:1, 46 is_strictroute:1, 47 srr_is_hit:1, 48 is_changed:1, 49 rr_needaddr:1, 50 ts_needtime:1, 51 ts_needaddr:1; 52 unsigned char router_alert; 53 unsigned char cipso; 54 unsigned char __pad2; 55 unsigned char __data[0]; 56 }; 57 58 #define optlength(opt) (sizeof(struct ip_options) + opt->optlen) 59 60 struct inet_request_sock { 61 struct request_sock req; 62 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 63 u16 inet6_rsk_offset; 64 /* 2 bytes hole, try to pack */ 65 #endif 66 __be32 loc_addr; 67 __be32 rmt_addr; 68 __be16 rmt_port; 69 u16 snd_wscale : 4, 70 rcv_wscale : 4, 71 tstamp_ok : 1, 72 sack_ok : 1, 73 wscale_ok : 1, 74 ecn_ok : 1, 75 acked : 1; 76 struct ip_options *opt; 77 }; 78 79 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) 80 { 81 return (struct inet_request_sock *)sk; 82 } 83 84 struct ip_mc_socklist; 85 struct ipv6_pinfo; 86 struct rtable; 87 88 /** struct inet_sock - representation of INET sockets 89 * 90 * @sk - ancestor class 91 * @pinet6 - pointer to IPv6 control block 92 * @daddr - Foreign IPv4 addr 93 * @rcv_saddr - Bound local IPv4 addr 94 * @dport - Destination port 95 * @num - Local port 96 * @saddr - Sending source 97 * @uc_ttl - Unicast TTL 98 * @sport - Source port 99 * @id - ID counter for DF pkts 100 * @tos - TOS 101 * @mc_ttl - Multicasting TTL 102 * @is_icsk - is this an inet_connection_sock? 103 * @mc_index - Multicast device index 104 * @mc_list - Group array 105 * @cork - info to build ip hdr on each ip frag while socket is corked 106 */ 107 struct inet_sock { 108 /* sk and pinet6 has to be the first two members of inet_sock */ 109 struct sock sk; 110 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 111 struct ipv6_pinfo *pinet6; 112 #endif 113 /* Socket demultiplex comparisons on incoming packets. */ 114 __be32 daddr; 115 __be32 rcv_saddr; 116 __be16 dport; 117 __u16 num; 118 __be32 saddr; 119 __s16 uc_ttl; 120 __u16 cmsg_flags; 121 struct ip_options *opt; 122 __be16 sport; 123 __u16 id; 124 __u8 tos; 125 __u8 mc_ttl; 126 __u8 pmtudisc; 127 __u8 recverr:1, 128 is_icsk:1, 129 freebind:1, 130 hdrincl:1, 131 mc_loop:1; 132 int mc_index; 133 __be32 mc_addr; 134 struct ip_mc_socklist *mc_list; 135 struct { 136 unsigned int flags; 137 unsigned int fragsize; 138 struct ip_options *opt; 139 struct rtable *rt; 140 int length; /* Total length of all frames */ 141 __be32 addr; 142 struct flowi fl; 143 } cork; 144 }; 145 146 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 147 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 148 149 static inline struct inet_sock *inet_sk(const struct sock *sk) 150 { 151 return (struct inet_sock *)sk; 152 } 153 154 static inline void __inet_sk_copy_descendant(struct sock *sk_to, 155 const struct sock *sk_from, 156 const int ancestor_size) 157 { 158 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 159 sk_from->sk_prot->obj_size - ancestor_size); 160 } 161 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)) 162 static inline void inet_sk_copy_descendant(struct sock *sk_to, 163 const struct sock *sk_from) 164 { 165 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 166 } 167 #endif 168 169 extern int inet_sk_rebuild_header(struct sock *sk); 170 171 extern u32 inet_ehash_secret; 172 extern void build_ehash_secret(void); 173 174 static inline unsigned int inet_ehashfn(const __be32 laddr, const __u16 lport, 175 const __be32 faddr, const __be16 fport) 176 { 177 return jhash_2words((__force __u32) laddr ^ (__force __u32) faddr, 178 ((__u32) lport) << 16 | (__force __u32)fport, 179 inet_ehash_secret); 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 __be32 laddr = inet->rcv_saddr; 186 const __u16 lport = inet->num; 187 const __be32 faddr = inet->daddr; 188 const __be16 fport = inet->dport; 189 190 return inet_ehashfn(laddr, lport, faddr, fport); 191 } 192 193 #endif /* _INET_SOCK_H */ 194