diff options
Diffstat (limited to 'include/net/inet_sock.h')
| -rw-r--r-- | include/net/inet_sock.h | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h new file mode 100644 index 00000000..ae17e135 --- /dev/null +++ b/include/net/inet_sock.h @@ -0,0 +1,253 @@ +/* + * INET An implementation of the TCP/IP protocol suite for the LINUX + * operating system. INET is implemented using the BSD Socket + * interface as the means of communication with the user level. + * + * Definitions for inet_sock + * + * Authors: Many, reorganised here by + * Arnaldo Carvalho de Melo <acme@mandriva.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ +#ifndef _INET_SOCK_H +#define _INET_SOCK_H + + +#include <linux/kmemcheck.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/jhash.h> +#include <linux/netdevice.h> + +#include <net/flow.h> +#include <net/sock.h> +#include <net/request_sock.h> +#include <net/netns/hash.h> + +/** struct ip_options - IP Options + * + * @faddr - Saved first hop address + * @nexthop - Saved nexthop address in LSRR and SSRR + * @is_data - Options in __data, rather than skb + * @is_strictroute - Strict source route + * @srr_is_hit - Packet destination addr was our one + * @is_changed - IP checksum more not valid + * @rr_needaddr - Need to record addr of outgoing dev + * @ts_needtime - Need to record timestamp + * @ts_needaddr - Need to record addr of outgoing dev + */ +struct ip_options { + __be32 faddr; + __be32 nexthop; + unsigned char optlen; + unsigned char srr; + unsigned char rr; + unsigned char ts; + unsigned char is_strictroute:1, + srr_is_hit:1, + is_changed:1, + rr_needaddr:1, + ts_needtime:1, + ts_needaddr:1; + unsigned char router_alert; + unsigned char cipso; + unsigned char __pad2; + unsigned char __data[0]; +}; + +struct ip_options_rcu { + struct rcu_head rcu; + struct ip_options opt; +}; + +struct ip_options_data { + struct ip_options_rcu opt; + char data[40]; +}; + +struct inet_request_sock { + struct request_sock req; +#if IS_ENABLED(CONFIG_IPV6) + u16 inet6_rsk_offset; +#endif + __be16 loc_port; + __be32 loc_addr; + __be32 rmt_addr; + __be16 rmt_port; + kmemcheck_bitfield_begin(flags); + u16 snd_wscale : 4, + rcv_wscale : 4, + tstamp_ok : 1, + sack_ok : 1, + wscale_ok : 1, + ecn_ok : 1, + acked : 1, + no_srccheck: 1; + kmemcheck_bitfield_end(flags); + struct ip_options_rcu *opt; +}; + +static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) +{ + return (struct inet_request_sock *)sk; +} + +struct inet_cork { + unsigned int flags; + __be32 addr; + struct ip_options *opt; + unsigned int fragsize; + struct dst_entry *dst; + int length; /* Total length of all frames */ + struct page *page; + u32 off; + u8 tx_flags; +}; + +struct inet_cork_full { + struct inet_cork base; + struct flowi fl; +}; + +struct ip_mc_socklist; +struct ipv6_pinfo; +struct rtable; + +/** struct inet_sock - representation of INET sockets + * + * @sk - ancestor class + * @pinet6 - pointer to IPv6 control block + * @inet_daddr - Foreign IPv4 addr + * @inet_rcv_saddr - Bound local IPv4 addr + * @inet_dport - Destination port + * @inet_num - Local port + * @inet_saddr - Sending source + * @uc_ttl - Unicast TTL + * @inet_sport - Source port + * @inet_id - ID counter for DF pkts + * @tos - TOS + * @mc_ttl - Multicasting TTL + * @is_icsk - is this an inet_connection_sock? + * @uc_index - Unicast outgoing device index + * @mc_index - Multicast device index + * @mc_list - Group array + * @cork - info to build ip hdr on each ip frag while socket is corked + */ +struct inet_sock { + /* sk and pinet6 has to be the first two members of inet_sock */ + struct sock sk; +#if IS_ENABLED(CONFIG_IPV6) + struct ipv6_pinfo *pinet6; +#endif + /* Socket demultiplex comparisons on incoming packets. */ +#define inet_daddr sk.__sk_common.skc_daddr +#define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr + + __be16 inet_dport; + __u16 inet_num; + __be32 inet_saddr; + __s16 uc_ttl; + __u16 cmsg_flags; + __be16 inet_sport; + __u16 inet_id; + + struct ip_options_rcu __rcu *inet_opt; + __u8 tos; + __u8 min_ttl; + __u8 mc_ttl; + __u8 pmtudisc; + __u8 recverr:1, + is_icsk:1, + freebind:1, + hdrincl:1, + mc_loop:1, + transparent:1, + mc_all:1, + nodefrag:1; + __u8 rcv_tos; + int uc_index; + int mc_index; + __be32 mc_addr; + struct ip_mc_socklist __rcu *mc_list; + struct inet_cork_full cork; +}; + +#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ +#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ + +static inline struct inet_sock *inet_sk(const struct sock *sk) +{ + return (struct inet_sock *)sk; +} + +static inline void __inet_sk_copy_descendant(struct sock *sk_to, + const struct sock *sk_from, + const int ancestor_size) +{ + memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, + sk_from->sk_prot->obj_size - ancestor_size); +} +#if !(IS_ENABLED(CONFIG_IPV6)) +static inline void inet_sk_copy_descendant(struct sock *sk_to, + const struct sock *sk_from) +{ + __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); +} +#endif + +extern int inet_sk_rebuild_header(struct sock *sk); + +extern u32 inet_ehash_secret; +extern void build_ehash_secret(void); + +static inline unsigned int inet_ehashfn(struct net *net, + const __be32 laddr, const __u16 lport, + const __be32 faddr, const __be16 fport) +{ + return jhash_3words((__force __u32) laddr, + (__force __u32) faddr, + ((__u32) lport) << 16 | (__force __u32)fport, + inet_ehash_secret + net_hash_mix(net)); +} + +static inline int inet_sk_ehashfn(const struct sock *sk) +{ + const struct inet_sock *inet = inet_sk(sk); + const __be32 laddr = inet->inet_rcv_saddr; + const __u16 lport = inet->inet_num; + const __be32 faddr = inet->inet_daddr; + const __be16 fport = inet->inet_dport; + struct net *net = sock_net(sk); + + return inet_ehashfn(net, laddr, lport, faddr, fport); +} + +static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops) +{ + struct request_sock *req = reqsk_alloc(ops); + struct inet_request_sock *ireq = inet_rsk(req); + + if (req != NULL) { + kmemcheck_annotate_bitfield(ireq, flags); + ireq->opt = NULL; + } + + return req; +} + +static inline __u8 inet_sk_flowi_flags(const struct sock *sk) +{ + __u8 flags = 0; + + if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl) + flags |= FLOWI_FLAG_ANYSRC; + if (sk->sk_protocol == IPPROTO_TCP) + flags |= FLOWI_FLAG_PRECOW_METRICS; + return flags; +} + +#endif /* _INET_SOCK_H */ |