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 #include <net/route.h> 28 29 /** struct ip_options - IP Options 30 * 31 * @faddr - Saved first hop address 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 __be32 faddr; 42 unsigned char optlen; 43 unsigned char srr; 44 unsigned char rr; 45 unsigned char ts; 46 unsigned char is_data:1, 47 is_strictroute:1, 48 srr_is_hit:1, 49 is_changed:1, 50 rr_needaddr:1, 51 ts_needtime:1, 52 ts_needaddr:1; 53 unsigned char router_alert; 54 unsigned char cipso; 55 unsigned char __pad2; 56 unsigned char __data[0]; 57 }; 58 59 #define optlength(opt) (sizeof(struct ip_options) + opt->optlen) 60 61 struct inet_request_sock { 62 struct request_sock req; 63 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 64 u16 inet6_rsk_offset; 65 /* 2 bytes hole, try to pack */ 66 #endif 67 __be32 loc_addr; 68 __be32 rmt_addr; 69 __be16 rmt_port; 70 u16 snd_wscale : 4, 71 rcv_wscale : 4, 72 tstamp_ok : 1, 73 sack_ok : 1, 74 wscale_ok : 1, 75 ecn_ok : 1, 76 acked : 1; 77 struct ip_options *opt; 78 }; 79 80 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) 81 { 82 return (struct inet_request_sock *)sk; 83 } 84 85 struct ip_mc_socklist; 86 struct ipv6_pinfo; 87 struct rtable; 88 89 /** struct inet_sock - representation of INET sockets 90 * 91 * @sk - ancestor class 92 * @pinet6 - pointer to IPv6 control block 93 * @daddr - Foreign IPv4 addr 94 * @rcv_saddr - Bound local IPv4 addr 95 * @dport - Destination port 96 * @num - Local port 97 * @saddr - Sending source 98 * @uc_ttl - Unicast TTL 99 * @sport - Source port 100 * @id - ID counter for DF pkts 101 * @tos - TOS 102 * @mc_ttl - Multicasting TTL 103 * @is_icsk - is this an inet_connection_sock? 104 * @mc_index - Multicast device index 105 * @mc_list - Group array 106 * @cork - info to build ip hdr on each ip frag while socket is corked 107 */ 108 struct inet_sock { 109 /* sk and pinet6 has to be the first two members of inet_sock */ 110 struct sock sk; 111 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 112 struct ipv6_pinfo *pinet6; 113 #endif 114 /* Socket demultiplex comparisons on incoming packets. */ 115 __be32 daddr; 116 __be32 rcv_saddr; 117 __be16 dport; 118 __u16 num; 119 __be32 saddr; 120 __s16 uc_ttl; 121 __u16 cmsg_flags; 122 struct ip_options *opt; 123 __be16 sport; 124 __u16 id; 125 __u8 tos; 126 __u8 mc_ttl; 127 __u8 pmtudisc; 128 __u8 recverr:1, 129 is_icsk:1, 130 freebind:1, 131 hdrincl:1, 132 mc_loop:1; 133 int mc_index; 134 __be32 mc_addr; 135 struct ip_mc_socklist *mc_list; 136 struct { 137 unsigned int flags; 138 unsigned int fragsize; 139 struct ip_options *opt; 140 struct rtable *rt; 141 int length; /* Total length of all frames */ 142 __be32 addr; 143 struct flowi fl; 144 } cork; 145 }; 146 147 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 148 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 149 150 static inline struct inet_sock *inet_sk(const struct sock *sk) 151 { 152 return (struct inet_sock *)sk; 153 } 154 155 static inline void __inet_sk_copy_descendant(struct sock *sk_to, 156 const struct sock *sk_from, 157 const int ancestor_size) 158 { 159 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 160 sk_from->sk_prot->obj_size - ancestor_size); 161 } 162 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)) 163 static inline void inet_sk_copy_descendant(struct sock *sk_to, 164 const struct sock *sk_from) 165 { 166 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 167 } 168 #endif 169 170 extern int inet_sk_rebuild_header(struct sock *sk); 171 172 extern u32 inet_ehash_secret; 173 extern void build_ehash_secret(void); 174 175 static inline unsigned int inet_ehashfn(const __be32 laddr, const __u16 lport, 176 const __be32 faddr, const __be16 fport) 177 { 178 return jhash_3words((__force __u32) laddr, 179 (__force __u32) faddr, 180 ((__u32) lport) << 16 | (__force __u32)fport, 181 inet_ehash_secret); 182 } 183 184 static inline int inet_sk_ehashfn(const struct sock *sk) 185 { 186 const struct inet_sock *inet = inet_sk(sk); 187 const __be32 laddr = inet->rcv_saddr; 188 const __u16 lport = inet->num; 189 const __be32 faddr = inet->daddr; 190 const __be16 fport = inet->dport; 191 192 return inet_ehashfn(laddr, lport, faddr, fport); 193 } 194 195 196 static inline int inet_iif(const struct sk_buff *skb) 197 { 198 return ((struct rtable *)skb->dst)->rt_iif; 199 } 200 201 #endif /* _INET_SOCK_H */ 202