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 #define ir_loc_addr req.__req_common.skc_rcv_saddr 74 #define ir_rmt_addr req.__req_common.skc_daddr 75 #define ir_num req.__req_common.skc_num 76 #define ir_rmt_port req.__req_common.skc_dport 77 #define ir_v6_rmt_addr req.__req_common.skc_v6_daddr 78 #define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr 79 #define ir_iif req.__req_common.skc_bound_dev_if 80 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 struct sk_buff *pktopts; 93 u32 ir_mark; 94 }; 95 96 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) 97 { 98 return (struct inet_request_sock *)sk; 99 } 100 101 static inline u32 inet_request_mark(struct sock *sk, struct sk_buff *skb) 102 { 103 if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept) { 104 return skb->mark; 105 } else { 106 return sk->sk_mark; 107 } 108 } 109 110 struct inet_cork { 111 unsigned int flags; 112 __be32 addr; 113 struct ip_options *opt; 114 unsigned int fragsize; 115 int length; /* Total length of all frames */ 116 struct dst_entry *dst; 117 u8 tx_flags; 118 __u8 ttl; 119 __s16 tos; 120 char priority; 121 }; 122 123 struct inet_cork_full { 124 struct inet_cork base; 125 struct flowi fl; 126 }; 127 128 struct ip_mc_socklist; 129 struct ipv6_pinfo; 130 struct rtable; 131 132 /** struct inet_sock - representation of INET sockets 133 * 134 * @sk - ancestor class 135 * @pinet6 - pointer to IPv6 control block 136 * @inet_daddr - Foreign IPv4 addr 137 * @inet_rcv_saddr - Bound local IPv4 addr 138 * @inet_dport - Destination port 139 * @inet_num - Local port 140 * @inet_saddr - Sending source 141 * @uc_ttl - Unicast TTL 142 * @inet_sport - Source port 143 * @inet_id - ID counter for DF pkts 144 * @tos - TOS 145 * @mc_ttl - Multicasting TTL 146 * @is_icsk - is this an inet_connection_sock? 147 * @uc_index - Unicast outgoing device index 148 * @mc_index - Multicast device index 149 * @mc_list - Group array 150 * @cork - info to build ip hdr on each ip frag while socket is corked 151 */ 152 struct inet_sock { 153 /* sk and pinet6 has to be the first two members of inet_sock */ 154 struct sock sk; 155 #if IS_ENABLED(CONFIG_IPV6) 156 struct ipv6_pinfo *pinet6; 157 #endif 158 /* Socket demultiplex comparisons on incoming packets. */ 159 #define inet_daddr sk.__sk_common.skc_daddr 160 #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr 161 #define inet_dport sk.__sk_common.skc_dport 162 #define inet_num sk.__sk_common.skc_num 163 164 __be32 inet_saddr; 165 __s16 uc_ttl; 166 __u16 cmsg_flags; 167 __be16 inet_sport; 168 __u16 inet_id; 169 170 struct ip_options_rcu __rcu *inet_opt; 171 int rx_dst_ifindex; 172 __u8 tos; 173 __u8 min_ttl; 174 __u8 mc_ttl; 175 __u8 pmtudisc; 176 __u8 recverr:1, 177 is_icsk:1, 178 freebind:1, 179 hdrincl:1, 180 mc_loop:1, 181 transparent:1, 182 mc_all:1, 183 nodefrag:1; 184 __u8 rcv_tos; 185 int uc_index; 186 int mc_index; 187 __be32 mc_addr; 188 struct ip_mc_socklist __rcu *mc_list; 189 struct inet_cork_full cork; 190 }; 191 192 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 193 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 194 195 static inline struct inet_sock *inet_sk(const struct sock *sk) 196 { 197 return (struct inet_sock *)sk; 198 } 199 200 static inline void __inet_sk_copy_descendant(struct sock *sk_to, 201 const struct sock *sk_from, 202 const int ancestor_size) 203 { 204 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 205 sk_from->sk_prot->obj_size - ancestor_size); 206 } 207 #if !(IS_ENABLED(CONFIG_IPV6)) 208 static inline void inet_sk_copy_descendant(struct sock *sk_to, 209 const struct sock *sk_from) 210 { 211 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 212 } 213 #endif 214 215 int inet_sk_rebuild_header(struct sock *sk); 216 217 static inline unsigned int __inet_ehashfn(const __be32 laddr, 218 const __u16 lport, 219 const __be32 faddr, 220 const __be16 fport, 221 u32 initval) 222 { 223 return jhash_3words((__force __u32) laddr, 224 (__force __u32) faddr, 225 ((__u32) lport) << 16 | (__force __u32)fport, 226 initval); 227 } 228 229 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops) 230 { 231 struct request_sock *req = reqsk_alloc(ops); 232 struct inet_request_sock *ireq = inet_rsk(req); 233 234 if (req != NULL) { 235 kmemcheck_annotate_bitfield(ireq, flags); 236 ireq->opt = NULL; 237 } 238 239 return req; 240 } 241 242 static inline __u8 inet_sk_flowi_flags(const struct sock *sk) 243 { 244 __u8 flags = 0; 245 246 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl) 247 flags |= FLOWI_FLAG_ANYSRC; 248 return flags; 249 } 250 251 #endif /* _INET_SOCK_H */ 252