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 __u8 ttl; 107 __s16 tos; 108 char priority; 109 }; 110 111 struct inet_cork_full { 112 struct inet_cork base; 113 struct flowi fl; 114 }; 115 116 struct ip_mc_socklist; 117 struct ipv6_pinfo; 118 struct rtable; 119 120 /** struct inet_sock - representation of INET sockets 121 * 122 * @sk - ancestor class 123 * @pinet6 - pointer to IPv6 control block 124 * @inet_daddr - Foreign IPv4 addr 125 * @inet_rcv_saddr - Bound local IPv4 addr 126 * @inet_dport - Destination port 127 * @inet_num - Local port 128 * @inet_saddr - Sending source 129 * @uc_ttl - Unicast TTL 130 * @inet_sport - Source port 131 * @inet_id - ID counter for DF pkts 132 * @tos - TOS 133 * @mc_ttl - Multicasting TTL 134 * @is_icsk - is this an inet_connection_sock? 135 * @uc_index - Unicast outgoing device index 136 * @mc_index - Multicast device index 137 * @mc_list - Group array 138 * @cork - info to build ip hdr on each ip frag while socket is corked 139 */ 140 struct inet_sock { 141 /* sk and pinet6 has to be the first two members of inet_sock */ 142 struct sock sk; 143 #if IS_ENABLED(CONFIG_IPV6) 144 struct ipv6_pinfo *pinet6; 145 #endif 146 /* Socket demultiplex comparisons on incoming packets. */ 147 #define inet_daddr sk.__sk_common.skc_daddr 148 #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr 149 #define inet_addrpair sk.__sk_common.skc_addrpair 150 #define inet_dport sk.__sk_common.skc_dport 151 #define inet_num sk.__sk_common.skc_num 152 #define inet_portpair sk.__sk_common.skc_portpair 153 154 __be32 inet_saddr; 155 __s16 uc_ttl; 156 __u16 cmsg_flags; 157 __be16 inet_sport; 158 __u16 inet_id; 159 160 struct ip_options_rcu __rcu *inet_opt; 161 int rx_dst_ifindex; 162 __u8 tos; 163 __u8 min_ttl; 164 __u8 mc_ttl; 165 __u8 pmtudisc; 166 __u8 recverr:1, 167 is_icsk:1, 168 freebind:1, 169 hdrincl:1, 170 mc_loop:1, 171 transparent:1, 172 mc_all:1, 173 nodefrag:1; 174 __u8 rcv_tos; 175 int uc_index; 176 int mc_index; 177 __be32 mc_addr; 178 struct ip_mc_socklist __rcu *mc_list; 179 struct inet_cork_full cork; 180 }; 181 182 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 183 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 184 185 static inline struct inet_sock *inet_sk(const struct sock *sk) 186 { 187 return (struct inet_sock *)sk; 188 } 189 190 static inline void __inet_sk_copy_descendant(struct sock *sk_to, 191 const struct sock *sk_from, 192 const int ancestor_size) 193 { 194 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 195 sk_from->sk_prot->obj_size - ancestor_size); 196 } 197 #if !(IS_ENABLED(CONFIG_IPV6)) 198 static inline void inet_sk_copy_descendant(struct sock *sk_to, 199 const struct sock *sk_from) 200 { 201 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 202 } 203 #endif 204 205 int inet_sk_rebuild_header(struct sock *sk); 206 207 extern u32 inet_ehash_secret; 208 extern u32 ipv6_hash_secret; 209 void build_ehash_secret(void); 210 211 static inline unsigned int inet_ehashfn(struct net *net, 212 const __be32 laddr, const __u16 lport, 213 const __be32 faddr, const __be16 fport) 214 { 215 return jhash_3words((__force __u32) laddr, 216 (__force __u32) faddr, 217 ((__u32) lport) << 16 | (__force __u32)fport, 218 inet_ehash_secret + net_hash_mix(net)); 219 } 220 221 static inline int inet_sk_ehashfn(const struct sock *sk) 222 { 223 const struct inet_sock *inet = inet_sk(sk); 224 const __be32 laddr = inet->inet_rcv_saddr; 225 const __u16 lport = inet->inet_num; 226 const __be32 faddr = inet->inet_daddr; 227 const __be16 fport = inet->inet_dport; 228 struct net *net = sock_net(sk); 229 230 return inet_ehashfn(net, laddr, lport, faddr, fport); 231 } 232 233 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops) 234 { 235 struct request_sock *req = reqsk_alloc(ops); 236 struct inet_request_sock *ireq = inet_rsk(req); 237 238 if (req != NULL) { 239 kmemcheck_annotate_bitfield(ireq, flags); 240 ireq->opt = NULL; 241 } 242 243 return req; 244 } 245 246 static inline __u8 inet_sk_flowi_flags(const struct sock *sk) 247 { 248 __u8 flags = 0; 249 250 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl) 251 flags |= FLOWI_FLAG_ANYSRC; 252 return flags; 253 } 254 255 #endif /* _INET_SOCK_H */ 256