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/kmemcheck.h> 21 #include <linux/string.h> 22 #include <linux/types.h> 23 #include <linux/jhash.h> 24 25 #include <net/flow.h> 26 #include <net/sock.h> 27 #include <net/request_sock.h> 28 #include <net/netns/hash.h> 29 30 /** struct ip_options - IP Options 31 * 32 * @faddr - Saved first hop address 33 * @is_data - Options in __data, rather than skb 34 * @is_strictroute - Strict source route 35 * @srr_is_hit - Packet destination addr was our one 36 * @is_changed - IP checksum more not valid 37 * @rr_needaddr - Need to record addr of outgoing dev 38 * @ts_needtime - Need to record timestamp 39 * @ts_needaddr - Need to record addr of outgoing dev 40 */ 41 struct ip_options { 42 __be32 faddr; 43 unsigned char optlen; 44 unsigned char srr; 45 unsigned char rr; 46 unsigned char ts; 47 unsigned char 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 #endif 66 __be16 loc_port; 67 __be32 loc_addr; 68 __be32 rmt_addr; 69 __be16 rmt_port; 70 kmemcheck_bitfield_begin(flags); 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 no_srccheck: 1; 79 kmemcheck_bitfield_end(flags); 80 struct ip_options *opt; 81 }; 82 83 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) 84 { 85 return (struct inet_request_sock *)sk; 86 } 87 88 struct ip_mc_socklist; 89 struct ipv6_pinfo; 90 struct rtable; 91 92 /** struct inet_sock - representation of INET sockets 93 * 94 * @sk - ancestor class 95 * @pinet6 - pointer to IPv6 control block 96 * @inet_daddr - Foreign IPv4 addr 97 * @inet_rcv_saddr - Bound local IPv4 addr 98 * @inet_dport - Destination port 99 * @inet_num - Local port 100 * @inet_saddr - Sending source 101 * @uc_ttl - Unicast TTL 102 * @inet_sport - Source port 103 * @inet_id - ID counter for DF pkts 104 * @tos - TOS 105 * @mc_ttl - Multicasting TTL 106 * @is_icsk - is this an inet_connection_sock? 107 * @mc_index - Multicast device index 108 * @mc_list - Group array 109 * @cork - info to build ip hdr on each ip frag while socket is corked 110 */ 111 struct inet_sock { 112 /* sk and pinet6 has to be the first two members of inet_sock */ 113 struct sock sk; 114 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 115 struct ipv6_pinfo *pinet6; 116 #endif 117 /* Socket demultiplex comparisons on incoming packets. */ 118 __be32 inet_daddr; 119 __be32 inet_rcv_saddr; 120 __be16 inet_dport; 121 __u16 inet_num; 122 __be32 inet_saddr; 123 __s16 uc_ttl; 124 __u16 cmsg_flags; 125 __be16 inet_sport; 126 __u16 inet_id; 127 128 struct ip_options *opt; 129 __u8 tos; 130 __u8 min_ttl; 131 __u8 mc_ttl; 132 __u8 pmtudisc; 133 __u8 recverr:1, 134 is_icsk:1, 135 freebind:1, 136 hdrincl:1, 137 mc_loop:1, 138 transparent:1, 139 mc_all:1; 140 int mc_index; 141 __be32 mc_addr; 142 struct ip_mc_socklist *mc_list; 143 struct { 144 unsigned int flags; 145 unsigned int fragsize; 146 struct ip_options *opt; 147 struct dst_entry *dst; 148 int length; /* Total length of all frames */ 149 __be32 addr; 150 struct flowi fl; 151 } cork; 152 }; 153 154 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 155 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 156 157 static inline struct inet_sock *inet_sk(const struct sock *sk) 158 { 159 return (struct inet_sock *)sk; 160 } 161 162 static inline void __inet_sk_copy_descendant(struct sock *sk_to, 163 const struct sock *sk_from, 164 const int ancestor_size) 165 { 166 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 167 sk_from->sk_prot->obj_size - ancestor_size); 168 } 169 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)) 170 static inline void inet_sk_copy_descendant(struct sock *sk_to, 171 const struct sock *sk_from) 172 { 173 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 174 } 175 #endif 176 177 extern int inet_sk_rebuild_header(struct sock *sk); 178 179 extern u32 inet_ehash_secret; 180 extern void build_ehash_secret(void); 181 182 static inline unsigned int inet_ehashfn(struct net *net, 183 const __be32 laddr, const __u16 lport, 184 const __be32 faddr, const __be16 fport) 185 { 186 return jhash_3words((__force __u32) laddr, 187 (__force __u32) faddr, 188 ((__u32) lport) << 16 | (__force __u32)fport, 189 inet_ehash_secret + net_hash_mix(net)); 190 } 191 192 static inline int inet_sk_ehashfn(const struct sock *sk) 193 { 194 const struct inet_sock *inet = inet_sk(sk); 195 const __be32 laddr = inet->inet_rcv_saddr; 196 const __u16 lport = inet->inet_num; 197 const __be32 faddr = inet->inet_daddr; 198 const __be16 fport = inet->inet_dport; 199 struct net *net = sock_net(sk); 200 201 return inet_ehashfn(net, laddr, lport, faddr, fport); 202 } 203 204 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops) 205 { 206 struct request_sock *req = reqsk_alloc(ops); 207 struct inet_request_sock *ireq = inet_rsk(req); 208 209 if (req != NULL) { 210 kmemcheck_annotate_bitfield(ireq, flags); 211 ireq->opt = NULL; 212 } 213 214 return req; 215 } 216 217 static inline __u8 inet_sk_flowi_flags(const struct sock *sk) 218 { 219 return inet_sk(sk)->transparent ? FLOWI_FLAG_ANYSRC : 0; 220 } 221 222 #endif /* _INET_SOCK_H */ 223