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 #include <linux/netdevice.h> 25 26 #include <net/flow.h> 27 #include <net/sock.h> 28 #include <net/request_sock.h> 29 #include <net/netns/hash.h> 30 31 /** struct ip_options - IP Options 32 * 33 * @faddr - Saved first hop address 34 * @is_data - Options in __data, rather than skb 35 * @is_strictroute - Strict source route 36 * @srr_is_hit - Packet destination addr was our one 37 * @is_changed - IP checksum more not valid 38 * @rr_needaddr - Need to record addr of outgoing dev 39 * @ts_needtime - Need to record timestamp 40 * @ts_needaddr - Need to record addr of outgoing dev 41 */ 42 struct ip_options { 43 __be32 faddr; 44 unsigned char optlen; 45 unsigned char srr; 46 unsigned char rr; 47 unsigned char ts; 48 unsigned char 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 cipso; 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 #endif 67 __be16 loc_port; 68 __be32 loc_addr; 69 __be32 rmt_addr; 70 __be16 rmt_port; 71 kmemcheck_bitfield_begin(flags); 72 u16 snd_wscale : 4, 73 rcv_wscale : 4, 74 tstamp_ok : 1, 75 sack_ok : 1, 76 wscale_ok : 1, 77 ecn_ok : 1, 78 acked : 1, 79 no_srccheck: 1; 80 kmemcheck_bitfield_end(flags); 81 struct ip_options *opt; 82 }; 83 84 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) 85 { 86 return (struct inet_request_sock *)sk; 87 } 88 89 struct inet_cork { 90 unsigned int flags; 91 unsigned int fragsize; 92 struct ip_options *opt; 93 struct dst_entry *dst; 94 int length; /* Total length of all frames */ 95 __be32 addr; 96 struct flowi fl; 97 struct page *page; 98 u32 off; 99 u8 tx_flags; 100 }; 101 102 struct ip_mc_socklist; 103 struct ipv6_pinfo; 104 struct rtable; 105 106 /** struct inet_sock - representation of INET sockets 107 * 108 * @sk - ancestor class 109 * @pinet6 - pointer to IPv6 control block 110 * @inet_daddr - Foreign IPv4 addr 111 * @inet_rcv_saddr - Bound local IPv4 addr 112 * @inet_dport - Destination port 113 * @inet_num - Local port 114 * @inet_saddr - Sending source 115 * @uc_ttl - Unicast TTL 116 * @inet_sport - Source port 117 * @inet_id - ID counter for DF pkts 118 * @tos - TOS 119 * @mc_ttl - Multicasting TTL 120 * @is_icsk - is this an inet_connection_sock? 121 * @mc_index - Multicast device index 122 * @mc_list - Group array 123 * @cork - info to build ip hdr on each ip frag while socket is corked 124 */ 125 struct inet_sock { 126 /* sk and pinet6 has to be the first two members of inet_sock */ 127 struct sock sk; 128 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 129 struct ipv6_pinfo *pinet6; 130 #endif 131 /* Socket demultiplex comparisons on incoming packets. */ 132 #define inet_daddr sk.__sk_common.skc_daddr 133 #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr 134 135 __be16 inet_dport; 136 __u16 inet_num; 137 __be32 inet_saddr; 138 __s16 uc_ttl; 139 __u16 cmsg_flags; 140 __be16 inet_sport; 141 __u16 inet_id; 142 143 struct ip_options *opt; 144 __u8 tos; 145 __u8 min_ttl; 146 __u8 mc_ttl; 147 __u8 pmtudisc; 148 __u8 recverr:1, 149 is_icsk:1, 150 freebind:1, 151 hdrincl:1, 152 mc_loop:1, 153 transparent:1, 154 mc_all:1, 155 nodefrag:1; 156 int mc_index; 157 __be32 mc_addr; 158 struct ip_mc_socklist __rcu *mc_list; 159 struct inet_cork cork; 160 }; 161 162 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 163 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 164 165 static inline struct inet_sock *inet_sk(const struct sock *sk) 166 { 167 return (struct inet_sock *)sk; 168 } 169 170 static inline void __inet_sk_copy_descendant(struct sock *sk_to, 171 const struct sock *sk_from, 172 const int ancestor_size) 173 { 174 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 175 sk_from->sk_prot->obj_size - ancestor_size); 176 } 177 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)) 178 static inline void inet_sk_copy_descendant(struct sock *sk_to, 179 const struct sock *sk_from) 180 { 181 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 182 } 183 #endif 184 185 extern int inet_sk_rebuild_header(struct sock *sk); 186 187 extern u32 inet_ehash_secret; 188 extern void build_ehash_secret(void); 189 190 static inline unsigned int inet_ehashfn(struct net *net, 191 const __be32 laddr, const __u16 lport, 192 const __be32 faddr, const __be16 fport) 193 { 194 return jhash_3words((__force __u32) laddr, 195 (__force __u32) faddr, 196 ((__u32) lport) << 16 | (__force __u32)fport, 197 inet_ehash_secret + net_hash_mix(net)); 198 } 199 200 static inline int inet_sk_ehashfn(const struct sock *sk) 201 { 202 const struct inet_sock *inet = inet_sk(sk); 203 const __be32 laddr = inet->inet_rcv_saddr; 204 const __u16 lport = inet->inet_num; 205 const __be32 faddr = inet->inet_daddr; 206 const __be16 fport = inet->inet_dport; 207 struct net *net = sock_net(sk); 208 209 return inet_ehashfn(net, laddr, lport, faddr, fport); 210 } 211 212 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops) 213 { 214 struct request_sock *req = reqsk_alloc(ops); 215 struct inet_request_sock *ireq = inet_rsk(req); 216 217 if (req != NULL) { 218 kmemcheck_annotate_bitfield(ireq, flags); 219 ireq->opt = NULL; 220 } 221 222 return req; 223 } 224 225 static inline __u8 inet_sk_flowi_flags(const struct sock *sk) 226 { 227 __u8 flags = 0; 228 229 if (inet_sk(sk)->transparent) 230 flags |= FLOWI_FLAG_ANYSRC; 231 if (sk->sk_protocol == IPPROTO_TCP) 232 flags |= FLOWI_FLAG_PRECOW_METRICS; 233 return flags; 234 } 235 236 #endif /* _INET_SOCK_H */ 237