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376 lines
9.3 KiB
376 lines
9.3 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* INET An implementation of the TCP/IP protocol suite for the LINUX |
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* operating system. INET is implemented using the BSD Socket |
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* interface as the means of communication with the user level. |
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* |
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* Definitions for inet_sock |
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* |
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* Authors: Many, reorganised here by |
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* Arnaldo Carvalho de Melo <[email protected]> |
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*/ |
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#ifndef _INET_SOCK_H |
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#define _INET_SOCK_H |
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#include <linux/bitops.h> |
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#include <linux/string.h> |
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#include <linux/types.h> |
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#include <linux/jhash.h> |
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#include <linux/netdevice.h> |
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#include <net/flow.h> |
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#include <net/sock.h> |
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#include <net/request_sock.h> |
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#include <net/netns/hash.h> |
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#include <net/tcp_states.h> |
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#include <net/l3mdev.h> |
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/** struct ip_options - IP Options |
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* |
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* @faddr - Saved first hop address |
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* @nexthop - Saved nexthop address in LSRR and SSRR |
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* @is_strictroute - Strict source route |
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* @srr_is_hit - Packet destination addr was our one |
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* @is_changed - IP checksum more not valid |
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* @rr_needaddr - Need to record addr of outgoing dev |
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* @ts_needtime - Need to record timestamp |
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* @ts_needaddr - Need to record addr of outgoing dev |
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*/ |
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struct ip_options { |
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__be32 faddr; |
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__be32 nexthop; |
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unsigned char optlen; |
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unsigned char srr; |
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unsigned char rr; |
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unsigned char ts; |
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unsigned char is_strictroute:1, |
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srr_is_hit:1, |
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is_changed:1, |
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rr_needaddr:1, |
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ts_needtime:1, |
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ts_needaddr:1; |
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unsigned char router_alert; |
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unsigned char cipso; |
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unsigned char __pad2; |
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unsigned char __data[]; |
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}; |
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struct ip_options_rcu { |
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struct rcu_head rcu; |
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struct ip_options opt; |
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}; |
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struct ip_options_data { |
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struct ip_options_rcu opt; |
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char data[40]; |
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}; |
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struct inet_request_sock { |
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struct request_sock req; |
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#define ir_loc_addr req.__req_common.skc_rcv_saddr |
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#define ir_rmt_addr req.__req_common.skc_daddr |
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#define ir_num req.__req_common.skc_num |
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#define ir_rmt_port req.__req_common.skc_dport |
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#define ir_v6_rmt_addr req.__req_common.skc_v6_daddr |
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#define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr |
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#define ir_iif req.__req_common.skc_bound_dev_if |
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#define ir_cookie req.__req_common.skc_cookie |
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#define ireq_net req.__req_common.skc_net |
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#define ireq_state req.__req_common.skc_state |
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#define ireq_family req.__req_common.skc_family |
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u16 snd_wscale : 4, |
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rcv_wscale : 4, |
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tstamp_ok : 1, |
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sack_ok : 1, |
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wscale_ok : 1, |
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ecn_ok : 1, |
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acked : 1, |
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no_srccheck: 1, |
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smc_ok : 1; |
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u32 ir_mark; |
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union { |
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struct ip_options_rcu __rcu *ireq_opt; |
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#if IS_ENABLED(CONFIG_IPV6) |
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struct { |
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struct ipv6_txoptions *ipv6_opt; |
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struct sk_buff *pktopts; |
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}; |
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#endif |
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}; |
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}; |
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static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) |
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{ |
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return (struct inet_request_sock *)sk; |
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} |
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static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb) |
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{ |
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if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept) |
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return skb->mark; |
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return sk->sk_mark; |
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} |
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static inline int inet_request_bound_dev_if(const struct sock *sk, |
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struct sk_buff *skb) |
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{ |
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#ifdef CONFIG_NET_L3_MASTER_DEV |
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struct net *net = sock_net(sk); |
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if (!sk->sk_bound_dev_if && net->ipv4.sysctl_tcp_l3mdev_accept) |
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return l3mdev_master_ifindex_by_index(net, skb->skb_iif); |
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#endif |
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return sk->sk_bound_dev_if; |
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} |
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static inline int inet_sk_bound_l3mdev(const struct sock *sk) |
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{ |
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#ifdef CONFIG_NET_L3_MASTER_DEV |
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struct net *net = sock_net(sk); |
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if (!net->ipv4.sysctl_tcp_l3mdev_accept) |
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return l3mdev_master_ifindex_by_index(net, |
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sk->sk_bound_dev_if); |
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#endif |
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return 0; |
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} |
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static inline bool inet_bound_dev_eq(bool l3mdev_accept, int bound_dev_if, |
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int dif, int sdif) |
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{ |
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if (!bound_dev_if) |
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return !sdif || l3mdev_accept; |
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return bound_dev_if == dif || bound_dev_if == sdif; |
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} |
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struct inet_cork { |
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unsigned int flags; |
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__be32 addr; |
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struct ip_options *opt; |
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unsigned int fragsize; |
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int length; /* Total length of all frames */ |
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struct dst_entry *dst; |
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u8 tx_flags; |
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__u8 ttl; |
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__s16 tos; |
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char priority; |
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__u16 gso_size; |
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u64 transmit_time; |
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u32 mark; |
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}; |
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struct inet_cork_full { |
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struct inet_cork base; |
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struct flowi fl; |
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}; |
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struct ip_mc_socklist; |
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struct ipv6_pinfo; |
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struct rtable; |
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/** struct inet_sock - representation of INET sockets |
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* |
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* @sk - ancestor class |
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* @pinet6 - pointer to IPv6 control block |
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* @inet_daddr - Foreign IPv4 addr |
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* @inet_rcv_saddr - Bound local IPv4 addr |
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* @inet_dport - Destination port |
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* @inet_num - Local port |
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* @inet_saddr - Sending source |
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* @uc_ttl - Unicast TTL |
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* @inet_sport - Source port |
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* @inet_id - ID counter for DF pkts |
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* @tos - TOS |
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* @mc_ttl - Multicasting TTL |
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* @is_icsk - is this an inet_connection_sock? |
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* @uc_index - Unicast outgoing device index |
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* @mc_index - Multicast device index |
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* @mc_list - Group array |
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* @cork - info to build ip hdr on each ip frag while socket is corked |
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*/ |
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struct inet_sock { |
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/* sk and pinet6 has to be the first two members of inet_sock */ |
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struct sock sk; |
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#if IS_ENABLED(CONFIG_IPV6) |
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struct ipv6_pinfo *pinet6; |
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#endif |
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/* Socket demultiplex comparisons on incoming packets. */ |
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#define inet_daddr sk.__sk_common.skc_daddr |
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#define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr |
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#define inet_dport sk.__sk_common.skc_dport |
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#define inet_num sk.__sk_common.skc_num |
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__be32 inet_saddr; |
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__s16 uc_ttl; |
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__u16 cmsg_flags; |
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__be16 inet_sport; |
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__u16 inet_id; |
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struct ip_options_rcu __rcu *inet_opt; |
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int rx_dst_ifindex; |
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__u8 tos; |
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__u8 min_ttl; |
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__u8 mc_ttl; |
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__u8 pmtudisc; |
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__u8 recverr:1, |
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is_icsk:1, |
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freebind:1, |
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hdrincl:1, |
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mc_loop:1, |
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transparent:1, |
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mc_all:1, |
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nodefrag:1; |
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__u8 bind_address_no_port:1, |
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recverr_rfc4884:1, |
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defer_connect:1; /* Indicates that fastopen_connect is set |
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* and cookie exists so we defer connect |
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* until first data frame is written |
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*/ |
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__u8 rcv_tos; |
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__u8 convert_csum; |
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int uc_index; |
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int mc_index; |
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__be32 mc_addr; |
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struct ip_mc_socklist __rcu *mc_list; |
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struct inet_cork_full cork; |
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}; |
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#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ |
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#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ |
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/* cmsg flags for inet */ |
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#define IP_CMSG_PKTINFO BIT(0) |
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#define IP_CMSG_TTL BIT(1) |
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#define IP_CMSG_TOS BIT(2) |
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#define IP_CMSG_RECVOPTS BIT(3) |
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#define IP_CMSG_RETOPTS BIT(4) |
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#define IP_CMSG_PASSSEC BIT(5) |
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#define IP_CMSG_ORIGDSTADDR BIT(6) |
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#define IP_CMSG_CHECKSUM BIT(7) |
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#define IP_CMSG_RECVFRAGSIZE BIT(8) |
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/** |
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* sk_to_full_sk - Access to a full socket |
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* @sk: pointer to a socket |
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* |
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* SYNACK messages might be attached to request sockets. |
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* Some places want to reach the listener in this case. |
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*/ |
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static inline struct sock *sk_to_full_sk(struct sock *sk) |
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{ |
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#ifdef CONFIG_INET |
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if (sk && sk->sk_state == TCP_NEW_SYN_RECV) |
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sk = inet_reqsk(sk)->rsk_listener; |
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#endif |
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return sk; |
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} |
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/* sk_to_full_sk() variant with a const argument */ |
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static inline const struct sock *sk_const_to_full_sk(const struct sock *sk) |
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{ |
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#ifdef CONFIG_INET |
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if (sk && sk->sk_state == TCP_NEW_SYN_RECV) |
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sk = ((const struct request_sock *)sk)->rsk_listener; |
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#endif |
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return sk; |
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} |
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static inline struct sock *skb_to_full_sk(const struct sk_buff *skb) |
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{ |
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return sk_to_full_sk(skb->sk); |
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} |
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static inline struct inet_sock *inet_sk(const struct sock *sk) |
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{ |
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return (struct inet_sock *)sk; |
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} |
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static inline void __inet_sk_copy_descendant(struct sock *sk_to, |
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const struct sock *sk_from, |
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const int ancestor_size) |
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{ |
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memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, |
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sk_from->sk_prot->obj_size - ancestor_size); |
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} |
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int inet_sk_rebuild_header(struct sock *sk); |
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/** |
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* inet_sk_state_load - read sk->sk_state for lockless contexts |
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* @sk: socket pointer |
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* |
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* Paired with inet_sk_state_store(). Used in places we don't hold socket lock: |
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* tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ... |
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*/ |
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static inline int inet_sk_state_load(const struct sock *sk) |
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{ |
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/* state change might impact lockless readers. */ |
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return smp_load_acquire(&sk->sk_state); |
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} |
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/** |
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* inet_sk_state_store - update sk->sk_state |
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* @sk: socket pointer |
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* @newstate: new state |
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* |
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* Paired with inet_sk_state_load(). Should be used in contexts where |
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* state change might impact lockless readers. |
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*/ |
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void inet_sk_state_store(struct sock *sk, int newstate); |
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void inet_sk_set_state(struct sock *sk, int state); |
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static inline unsigned int __inet_ehashfn(const __be32 laddr, |
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const __u16 lport, |
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const __be32 faddr, |
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const __be16 fport, |
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u32 initval) |
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{ |
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return jhash_3words((__force __u32) laddr, |
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(__force __u32) faddr, |
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((__u32) lport) << 16 | (__force __u32)fport, |
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initval); |
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} |
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struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops, |
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struct sock *sk_listener, |
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bool attach_listener); |
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static inline __u8 inet_sk_flowi_flags(const struct sock *sk) |
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{ |
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__u8 flags = 0; |
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if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl) |
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flags |= FLOWI_FLAG_ANYSRC; |
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return flags; |
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} |
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static inline void inet_inc_convert_csum(struct sock *sk) |
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{ |
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inet_sk(sk)->convert_csum++; |
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} |
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static inline void inet_dec_convert_csum(struct sock *sk) |
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{ |
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if (inet_sk(sk)->convert_csum > 0) |
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inet_sk(sk)->convert_csum--; |
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} |
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static inline bool inet_get_convert_csum(struct sock *sk) |
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{ |
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return !!inet_sk(sk)->convert_csum; |
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} |
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static inline bool inet_can_nonlocal_bind(struct net *net, |
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struct inet_sock *inet) |
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{ |
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return net->ipv4.sysctl_ip_nonlocal_bind || |
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inet->freebind || inet->transparent; |
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} |
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#endif /* _INET_SOCK_H */
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