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_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 __be32 nexthop; 45 unsigned char optlen; 46 unsigned char srr; 47 unsigned char rr; 48 unsigned char ts; 49 unsigned char is_strictroute:1, 50 srr_is_hit:1, 51 is_changed:1, 52 rr_needaddr:1, 53 ts_needtime:1, 54 ts_needaddr:1; 55 unsigned char router_alert; 56 unsigned char cipso; 57 unsigned char __pad2; 58 unsigned char __data[0]; 59 }; 60 61 struct ip_options_rcu { 62 struct rcu_head rcu; 63 struct ip_options opt; 64 }; 65 66 struct ip_options_data { 67 struct ip_options_rcu opt; 68 char data[40]; 69 }; 70 71 struct inet_request_sock { 72 struct request_sock req; 73 #if IS_ENABLED(CONFIG_IPV6) 74 u16 inet6_rsk_offset; 75 #endif 76 __be16 loc_port; 77 __be32 loc_addr; 78 __be32 rmt_addr; 79 __be16 rmt_port; 80 kmemcheck_bitfield_begin(flags); 81 u16 snd_wscale : 4, 82 rcv_wscale : 4, 83 tstamp_ok : 1, 84 sack_ok : 1, 85 wscale_ok : 1, 86 ecn_ok : 1, 87 acked : 1, 88 no_srccheck: 1; 89 kmemcheck_bitfield_end(flags); 90 struct ip_options_rcu *opt; 91 }; 92 93 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) 94 { 95 return (struct inet_request_sock *)sk; 96 } 97 98 struct inet_cork { 99 unsigned int flags; 100 __be32 addr; 101 struct ip_options *opt; 102 unsigned int fragsize; 103 int length; /* Total length of all frames */ 104 struct dst_entry *dst; 105 u8 tx_flags; 106 }; 107 108 struct inet_cork_full { 109 struct inet_cork base; 110 struct flowi fl; 111 }; 112 113 struct ip_mc_socklist; 114 struct ipv6_pinfo; 115 struct rtable; 116 117 /** struct inet_sock - representation of INET sockets 118 * 119 * @sk - ancestor class 120 * @pinet6 - pointer to IPv6 control block 121 * @inet_daddr - Foreign IPv4 addr 122 * @inet_rcv_saddr - Bound local IPv4 addr 123 * @inet_dport - Destination port 124 * @inet_num - Local port 125 * @inet_saddr - Sending source 126 * @uc_ttl - Unicast TTL 127 * @inet_sport - Source port 128 * @inet_id - ID counter for DF pkts 129 * @tos - TOS 130 * @mc_ttl - Multicasting TTL 131 * @is_icsk - is this an inet_connection_sock? 132 * @uc_index - Unicast outgoing device index 133 * @mc_index - Multicast device index 134 * @mc_list - Group array 135 * @cork - info to build ip hdr on each ip frag while socket is corked 136 */ 137 struct inet_sock { 138 /* sk and pinet6 has to be the first two members of inet_sock */ 139 struct sock sk; 140 #if IS_ENABLED(CONFIG_IPV6) 141 struct ipv6_pinfo *pinet6; 142 #endif 143 /* Socket demultiplex comparisons on incoming packets. */ 144 #define inet_daddr sk.__sk_common.skc_daddr 145 #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr 146 #define inet_addrpair sk.__sk_common.skc_addrpair 147 #define inet_dport sk.__sk_common.skc_dport 148 #define inet_num sk.__sk_common.skc_num 149 #define inet_portpair sk.__sk_common.skc_portpair 150 151 __be32 inet_saddr; 152 __s16 uc_ttl; 153 __u16 cmsg_flags; 154 __be16 inet_sport; 155 __u16 inet_id; 156 157 struct ip_options_rcu __rcu *inet_opt; 158 int rx_dst_ifindex; 159 __u8 tos; 160 __u8 min_ttl; 161 __u8 mc_ttl; 162 __u8 pmtudisc; 163 __u8 recverr:1, 164 is_icsk:1, 165 freebind:1, 166 hdrincl:1, 167 mc_loop:1, 168 transparent:1, 169 mc_all:1, 170 nodefrag:1; 171 __u8 rcv_tos; 172 int uc_index; 173 int mc_index; 174 __be32 mc_addr; 175 struct ip_mc_socklist __rcu *mc_list; 176 struct inet_cork_full cork; 177 }; 178 179 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 180 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 181 182 static inline struct inet_sock *inet_sk(const struct sock *sk) 183 { 184 return (struct inet_sock *)sk; 185 } 186 187 static inline void __inet_sk_copy_descendant(struct sock *sk_to, 188 const struct sock *sk_from, 189 const int ancestor_size) 190 { 191 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 192 sk_from->sk_prot->obj_size - ancestor_size); 193 } 194 #if !(IS_ENABLED(CONFIG_IPV6)) 195 static inline void inet_sk_copy_descendant(struct sock *sk_to, 196 const struct sock *sk_from) 197 { 198 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 199 } 200 #endif 201 202 extern int inet_sk_rebuild_header(struct sock *sk); 203 204 extern u32 inet_ehash_secret; 205 extern u32 ipv6_hash_secret; 206 extern void build_ehash_secret(void); 207 208 static inline unsigned int inet_ehashfn(struct net *net, 209 const __be32 laddr, const __u16 lport, 210 const __be32 faddr, const __be16 fport) 211 { 212 return jhash_3words((__force __u32) laddr, 213 (__force __u32) faddr, 214 ((__u32) lport) << 16 | (__force __u32)fport, 215 inet_ehash_secret + net_hash_mix(net)); 216 } 217 218 static inline int inet_sk_ehashfn(const struct sock *sk) 219 { 220 const struct inet_sock *inet = inet_sk(sk); 221 const __be32 laddr = inet->inet_rcv_saddr; 222 const __u16 lport = inet->inet_num; 223 const __be32 faddr = inet->inet_daddr; 224 const __be16 fport = inet->inet_dport; 225 struct net *net = sock_net(sk); 226 227 return inet_ehashfn(net, laddr, lport, faddr, fport); 228 } 229 230 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops) 231 { 232 struct request_sock *req = reqsk_alloc(ops); 233 struct inet_request_sock *ireq = inet_rsk(req); 234 235 if (req != NULL) { 236 kmemcheck_annotate_bitfield(ireq, flags); 237 ireq->opt = NULL; 238 } 239 240 return req; 241 } 242 243 static inline __u8 inet_sk_flowi_flags(const struct sock *sk) 244 { 245 __u8 flags = 0; 246 247 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl) 248 flags |= FLOWI_FLAG_ANYSRC; 249 return flags; 250 } 251 252 #endif /* _INET_SOCK_H */ 253