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 * @nexthop - Saved nexthop address in LSRR and SSRR 35 * @is_data - Options in __data, rather than skb 36 * @is_strictroute - Strict source route 37 * @srr_is_hit - Packet destination addr was our one 38 * @is_changed - IP checksum more not valid 39 * @rr_needaddr - Need to record addr of outgoing dev 40 * @ts_needtime - Need to record timestamp 41 * @ts_needaddr - Need to record addr of outgoing dev 42 */ 43 struct ip_options { 44 __be32 faddr; 45 __be32 nexthop; 46 unsigned char optlen; 47 unsigned char srr; 48 unsigned char rr; 49 unsigned char ts; 50 unsigned char is_strictroute:1, 51 srr_is_hit:1, 52 is_changed:1, 53 rr_needaddr:1, 54 ts_needtime:1, 55 ts_needaddr:1; 56 unsigned char router_alert; 57 unsigned char cipso; 58 unsigned char __pad2; 59 unsigned char __data[0]; 60 }; 61 62 struct ip_options_rcu { 63 struct rcu_head rcu; 64 struct ip_options opt; 65 }; 66 67 struct ip_options_data { 68 struct ip_options_rcu opt; 69 char data[40]; 70 }; 71 72 struct inet_request_sock { 73 struct request_sock req; 74 #if IS_ENABLED(CONFIG_IPV6) 75 u16 inet6_rsk_offset; 76 #endif 77 __be16 loc_port; 78 __be32 loc_addr; 79 __be32 rmt_addr; 80 __be16 rmt_port; 81 kmemcheck_bitfield_begin(flags); 82 u16 snd_wscale : 4, 83 rcv_wscale : 4, 84 tstamp_ok : 1, 85 sack_ok : 1, 86 wscale_ok : 1, 87 ecn_ok : 1, 88 acked : 1, 89 no_srccheck: 1; 90 kmemcheck_bitfield_end(flags); 91 struct ip_options_rcu *opt; 92 }; 93 94 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) 95 { 96 return (struct inet_request_sock *)sk; 97 } 98 99 struct inet_cork { 100 unsigned int flags; 101 __be32 addr; 102 struct ip_options *opt; 103 unsigned int fragsize; 104 int length; /* Total length of all frames */ 105 struct dst_entry *dst; 106 u8 tx_flags; 107 }; 108 109 struct inet_cork_full { 110 struct inet_cork base; 111 struct flowi fl; 112 }; 113 114 struct ip_mc_socklist; 115 struct ipv6_pinfo; 116 struct rtable; 117 118 /** struct inet_sock - representation of INET sockets 119 * 120 * @sk - ancestor class 121 * @pinet6 - pointer to IPv6 control block 122 * @inet_daddr - Foreign IPv4 addr 123 * @inet_rcv_saddr - Bound local IPv4 addr 124 * @inet_dport - Destination port 125 * @inet_num - Local port 126 * @inet_saddr - Sending source 127 * @uc_ttl - Unicast TTL 128 * @inet_sport - Source port 129 * @inet_id - ID counter for DF pkts 130 * @tos - TOS 131 * @mc_ttl - Multicasting TTL 132 * @is_icsk - is this an inet_connection_sock? 133 * @uc_index - Unicast outgoing device index 134 * @mc_index - Multicast device index 135 * @mc_list - Group array 136 * @cork - info to build ip hdr on each ip frag while socket is corked 137 */ 138 struct inet_sock { 139 /* sk and pinet6 has to be the first two members of inet_sock */ 140 struct sock sk; 141 #if IS_ENABLED(CONFIG_IPV6) 142 struct ipv6_pinfo *pinet6; 143 #endif 144 /* Socket demultiplex comparisons on incoming packets. */ 145 #define inet_daddr sk.__sk_common.skc_daddr 146 #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr 147 148 __be16 inet_dport; 149 __u16 inet_num; 150 __be32 inet_saddr; 151 __s16 uc_ttl; 152 __u16 cmsg_flags; 153 __be16 inet_sport; 154 __u16 inet_id; 155 156 struct ip_options_rcu __rcu *inet_opt; 157 __u8 tos; 158 __u8 min_ttl; 159 __u8 mc_ttl; 160 __u8 pmtudisc; 161 __u8 recverr:1, 162 is_icsk:1, 163 freebind:1, 164 hdrincl:1, 165 mc_loop:1, 166 transparent:1, 167 mc_all:1, 168 nodefrag:1; 169 __u8 rcv_tos; 170 int uc_index; 171 int mc_index; 172 __be32 mc_addr; 173 int rx_dst_ifindex; 174 struct ip_mc_socklist __rcu *mc_list; 175 struct inet_cork_full cork; 176 }; 177 178 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 179 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 180 181 static inline struct inet_sock *inet_sk(const struct sock *sk) 182 { 183 return (struct inet_sock *)sk; 184 } 185 186 static inline void __inet_sk_copy_descendant(struct sock *sk_to, 187 const struct sock *sk_from, 188 const int ancestor_size) 189 { 190 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 191 sk_from->sk_prot->obj_size - ancestor_size); 192 } 193 #if !(IS_ENABLED(CONFIG_IPV6)) 194 static inline void inet_sk_copy_descendant(struct sock *sk_to, 195 const struct sock *sk_from) 196 { 197 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 198 } 199 #endif 200 201 extern int inet_sk_rebuild_header(struct sock *sk); 202 203 extern u32 inet_ehash_secret; 204 extern void build_ehash_secret(void); 205 206 static inline unsigned int inet_ehashfn(struct net *net, 207 const __be32 laddr, const __u16 lport, 208 const __be32 faddr, const __be16 fport) 209 { 210 return jhash_3words((__force __u32) laddr, 211 (__force __u32) faddr, 212 ((__u32) lport) << 16 | (__force __u32)fport, 213 inet_ehash_secret + net_hash_mix(net)); 214 } 215 216 static inline int inet_sk_ehashfn(const struct sock *sk) 217 { 218 const struct inet_sock *inet = inet_sk(sk); 219 const __be32 laddr = inet->inet_rcv_saddr; 220 const __u16 lport = inet->inet_num; 221 const __be32 faddr = inet->inet_daddr; 222 const __be16 fport = inet->inet_dport; 223 struct net *net = sock_net(sk); 224 225 return inet_ehashfn(net, laddr, lport, faddr, fport); 226 } 227 228 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops) 229 { 230 struct request_sock *req = reqsk_alloc(ops); 231 struct inet_request_sock *ireq = inet_rsk(req); 232 233 if (req != NULL) { 234 kmemcheck_annotate_bitfield(ireq, flags); 235 ireq->opt = NULL; 236 } 237 238 return req; 239 } 240 241 static inline __u8 inet_sk_flowi_flags(const struct sock *sk) 242 { 243 __u8 flags = 0; 244 245 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl) 246 flags |= FLOWI_FLAG_ANYSRC; 247 return flags; 248 } 249 250 #endif /* _INET_SOCK_H */ 251