LCOV - code coverage report
Current view: top level - include/net - inet_sock.h (source / functions) Hit Total Coverage
Test: landlock.info Lines: 24 39 61.5 %
Date: 2021-04-22 12:43:58 Functions: 0 0 -

          Line data    Source code
       1             : /* SPDX-License-Identifier: GPL-2.0-or-later */
       2             : /*
       3             :  * INET         An implementation of the TCP/IP protocol suite for the LINUX
       4             :  *              operating system.  INET is implemented using the  BSD Socket
       5             :  *              interface as the means of communication with the user level.
       6             :  *
       7             :  *              Definitions for inet_sock
       8             :  *
       9             :  * Authors:     Many, reorganised here by
      10             :  *              Arnaldo Carvalho de Melo <acme@mandriva.com>
      11             :  */
      12             : #ifndef _INET_SOCK_H
      13             : #define _INET_SOCK_H
      14             : 
      15             : #include <linux/bitops.h>
      16             : #include <linux/string.h>
      17             : #include <linux/types.h>
      18             : #include <linux/jhash.h>
      19             : #include <linux/netdevice.h>
      20             : 
      21             : #include <net/flow.h>
      22             : #include <net/sock.h>
      23             : #include <net/request_sock.h>
      24             : #include <net/netns/hash.h>
      25             : #include <net/tcp_states.h>
      26             : #include <net/l3mdev.h>
      27             : 
      28             : /** struct ip_options - IP Options
      29             :  *
      30             :  * @faddr - Saved first hop address
      31             :  * @nexthop - Saved nexthop address in LSRR and SSRR
      32             :  * @is_strictroute - Strict source route
      33             :  * @srr_is_hit - Packet destination addr was our one
      34             :  * @is_changed - IP checksum more not valid
      35             :  * @rr_needaddr - Need to record addr of outgoing dev
      36             :  * @ts_needtime - Need to record timestamp
      37             :  * @ts_needaddr - Need to record addr of outgoing dev
      38             :  */
      39             : struct ip_options {
      40             :         __be32          faddr;
      41             :         __be32          nexthop;
      42             :         unsigned char   optlen;
      43             :         unsigned char   srr;
      44             :         unsigned char   rr;
      45             :         unsigned char   ts;
      46             :         unsigned char   is_strictroute:1,
      47             :                         srr_is_hit:1,
      48             :                         is_changed:1,
      49             :                         rr_needaddr:1,
      50             :                         ts_needtime:1,
      51             :                         ts_needaddr:1;
      52             :         unsigned char   router_alert;
      53             :         unsigned char   cipso;
      54             :         unsigned char   __pad2;
      55             :         unsigned char   __data[];
      56             : };
      57             : 
      58             : struct ip_options_rcu {
      59             :         struct rcu_head rcu;
      60             :         struct ip_options opt;
      61             : };
      62             : 
      63             : struct ip_options_data {
      64             :         struct ip_options_rcu   opt;
      65             :         char                    data[40];
      66             : };
      67             : 
      68             : struct inet_request_sock {
      69             :         struct request_sock     req;
      70             : #define ir_loc_addr             req.__req_common.skc_rcv_saddr
      71             : #define ir_rmt_addr             req.__req_common.skc_daddr
      72             : #define ir_num                  req.__req_common.skc_num
      73             : #define ir_rmt_port             req.__req_common.skc_dport
      74             : #define ir_v6_rmt_addr          req.__req_common.skc_v6_daddr
      75             : #define ir_v6_loc_addr          req.__req_common.skc_v6_rcv_saddr
      76             : #define ir_iif                  req.__req_common.skc_bound_dev_if
      77             : #define ir_cookie               req.__req_common.skc_cookie
      78             : #define ireq_net                req.__req_common.skc_net
      79             : #define ireq_state              req.__req_common.skc_state
      80             : #define ireq_family             req.__req_common.skc_family
      81             : 
      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             :                                 smc_ok     : 1;
      91             :         u32                     ir_mark;
      92             :         union {
      93             :                 struct ip_options_rcu __rcu     *ireq_opt;
      94             : #if IS_ENABLED(CONFIG_IPV6)
      95             :                 struct {
      96             :                         struct ipv6_txoptions   *ipv6_opt;
      97             :                         struct sk_buff          *pktopts;
      98             :                 };
      99             : #endif
     100             :         };
     101             : };
     102             : 
     103          68 : static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
     104             : {
     105          60 :         return (struct inet_request_sock *)sk;
     106             : }
     107             : 
     108           4 : static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb)
     109             : {
     110           4 :         if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept)
     111           0 :                 return skb->mark;
     112             : 
     113             :         return sk->sk_mark;
     114             : }
     115             : 
     116           4 : static inline int inet_request_bound_dev_if(const struct sock *sk,
     117             :                                             struct sk_buff *skb)
     118             : {
     119             : #ifdef CONFIG_NET_L3_MASTER_DEV
     120             :         struct net *net = sock_net(sk);
     121             : 
     122             :         if (!sk->sk_bound_dev_if && net->ipv4.sysctl_tcp_l3mdev_accept)
     123             :                 return l3mdev_master_ifindex_by_index(net, skb->skb_iif);
     124             : #endif
     125             : 
     126           4 :         return sk->sk_bound_dev_if;
     127             : }
     128             : 
     129           6 : static inline int inet_sk_bound_l3mdev(const struct sock *sk)
     130             : {
     131             : #ifdef CONFIG_NET_L3_MASTER_DEV
     132             :         struct net *net = sock_net(sk);
     133             : 
     134             :         if (!net->ipv4.sysctl_tcp_l3mdev_accept)
     135             :                 return l3mdev_master_ifindex_by_index(net,
     136             :                                                       sk->sk_bound_dev_if);
     137             : #endif
     138             : 
     139           6 :         return 0;
     140             : }
     141             : 
     142          20 : static inline bool inet_bound_dev_eq(bool l3mdev_accept, int bound_dev_if,
     143             :                                      int dif, int sdif)
     144             : {
     145          20 :         if (!bound_dev_if)
     146             :                 return !sdif || l3mdev_accept;
     147           0 :         return bound_dev_if == dif || bound_dev_if == sdif;
     148             : }
     149             : 
     150             : struct inet_cork {
     151             :         unsigned int            flags;
     152             :         __be32                  addr;
     153             :         struct ip_options       *opt;
     154             :         unsigned int            fragsize;
     155             :         int                     length; /* Total length of all frames */
     156             :         struct dst_entry        *dst;
     157             :         u8                      tx_flags;
     158             :         __u8                    ttl;
     159             :         __s16                   tos;
     160             :         char                    priority;
     161             :         __u16                   gso_size;
     162             :         u64                     transmit_time;
     163             :         u32                     mark;
     164             : };
     165             : 
     166             : struct inet_cork_full {
     167             :         struct inet_cork        base;
     168             :         struct flowi            fl;
     169             : };
     170             : 
     171             : struct ip_mc_socklist;
     172             : struct ipv6_pinfo;
     173             : struct rtable;
     174             : 
     175             : /** struct inet_sock - representation of INET sockets
     176             :  *
     177             :  * @sk - ancestor class
     178             :  * @pinet6 - pointer to IPv6 control block
     179             :  * @inet_daddr - Foreign IPv4 addr
     180             :  * @inet_rcv_saddr - Bound local IPv4 addr
     181             :  * @inet_dport - Destination port
     182             :  * @inet_num - Local port
     183             :  * @inet_saddr - Sending source
     184             :  * @uc_ttl - Unicast TTL
     185             :  * @inet_sport - Source port
     186             :  * @inet_id - ID counter for DF pkts
     187             :  * @tos - TOS
     188             :  * @mc_ttl - Multicasting TTL
     189             :  * @is_icsk - is this an inet_connection_sock?
     190             :  * @uc_index - Unicast outgoing device index
     191             :  * @mc_index - Multicast device index
     192             :  * @mc_list - Group array
     193             :  * @cork - info to build ip hdr on each ip frag while socket is corked
     194             :  */
     195             : struct inet_sock {
     196             :         /* sk and pinet6 has to be the first two members of inet_sock */
     197             :         struct sock             sk;
     198             : #if IS_ENABLED(CONFIG_IPV6)
     199             :         struct ipv6_pinfo       *pinet6;
     200             : #endif
     201             :         /* Socket demultiplex comparisons on incoming packets. */
     202             : #define inet_daddr              sk.__sk_common.skc_daddr
     203             : #define inet_rcv_saddr          sk.__sk_common.skc_rcv_saddr
     204             : #define inet_dport              sk.__sk_common.skc_dport
     205             : #define inet_num                sk.__sk_common.skc_num
     206             : 
     207             :         __be32                  inet_saddr;
     208             :         __s16                   uc_ttl;
     209             :         __u16                   cmsg_flags;
     210             :         __be16                  inet_sport;
     211             :         __u16                   inet_id;
     212             : 
     213             :         struct ip_options_rcu __rcu     *inet_opt;
     214             :         int                     rx_dst_ifindex;
     215             :         __u8                    tos;
     216             :         __u8                    min_ttl;
     217             :         __u8                    mc_ttl;
     218             :         __u8                    pmtudisc;
     219             :         __u8                    recverr:1,
     220             :                                 is_icsk:1,
     221             :                                 freebind:1,
     222             :                                 hdrincl:1,
     223             :                                 mc_loop:1,
     224             :                                 transparent:1,
     225             :                                 mc_all:1,
     226             :                                 nodefrag:1;
     227             :         __u8                    bind_address_no_port:1,
     228             :                                 recverr_rfc4884:1,
     229             :                                 defer_connect:1; /* Indicates that fastopen_connect is set
     230             :                                                   * and cookie exists so we defer connect
     231             :                                                   * until first data frame is written
     232             :                                                   */
     233             :         __u8                    rcv_tos;
     234             :         __u8                    convert_csum;
     235             :         int                     uc_index;
     236             :         int                     mc_index;
     237             :         __be32                  mc_addr;
     238             :         struct ip_mc_socklist __rcu     *mc_list;
     239             :         struct inet_cork_full   cork;
     240             : };
     241             : 
     242             : #define IPCORK_OPT      1       /* ip-options has been held in ipcork.opt */
     243             : #define IPCORK_ALLFRAG  2       /* always fragment (for ipv6 for now) */
     244             : 
     245             : /* cmsg flags for inet */
     246             : #define IP_CMSG_PKTINFO         BIT(0)
     247             : #define IP_CMSG_TTL             BIT(1)
     248             : #define IP_CMSG_TOS             BIT(2)
     249             : #define IP_CMSG_RECVOPTS        BIT(3)
     250             : #define IP_CMSG_RETOPTS         BIT(4)
     251             : #define IP_CMSG_PASSSEC         BIT(5)
     252             : #define IP_CMSG_ORIGDSTADDR     BIT(6)
     253             : #define IP_CMSG_CHECKSUM        BIT(7)
     254             : #define IP_CMSG_RECVFRAGSIZE    BIT(8)
     255             : 
     256             : /**
     257             :  * sk_to_full_sk - Access to a full socket
     258             :  * @sk: pointer to a socket
     259             :  *
     260             :  * SYNACK messages might be attached to request sockets.
     261             :  * Some places want to reach the listener in this case.
     262             :  */
     263           0 : static inline struct sock *sk_to_full_sk(struct sock *sk)
     264             : {
     265             : #ifdef CONFIG_INET
     266           0 :         if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
     267           0 :                 sk = inet_reqsk(sk)->rsk_listener;
     268             : #endif
     269           0 :         return sk;
     270             : }
     271             : 
     272             : /* sk_to_full_sk() variant with a const argument */
     273             : static inline const struct sock *sk_const_to_full_sk(const struct sock *sk)
     274             : {
     275             : #ifdef CONFIG_INET
     276             :         if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
     277             :                 sk = ((const struct request_sock *)sk)->rsk_listener;
     278             : #endif
     279             :         return sk;
     280             : }
     281             : 
     282           0 : static inline struct sock *skb_to_full_sk(const struct sk_buff *skb)
     283             : {
     284           0 :         return sk_to_full_sk(skb->sk);
     285             : }
     286             : 
     287        6370 : static inline struct inet_sock *inet_sk(const struct sock *sk)
     288             : {
     289        5904 :         return (struct inet_sock *)sk;
     290             : }
     291             : 
     292             : static inline void __inet_sk_copy_descendant(struct sock *sk_to,
     293             :                                              const struct sock *sk_from,
     294             :                                              const int ancestor_size)
     295             : {
     296             :         memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
     297             :                sk_from->sk_prot->obj_size - ancestor_size);
     298             : }
     299             : 
     300             : int inet_sk_rebuild_header(struct sock *sk);
     301             : 
     302             : /**
     303             :  * inet_sk_state_load - read sk->sk_state for lockless contexts
     304             :  * @sk: socket pointer
     305             :  *
     306             :  * Paired with inet_sk_state_store(). Used in places we don't hold socket lock:
     307             :  * tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ...
     308             :  */
     309         714 : static inline int inet_sk_state_load(const struct sock *sk)
     310             : {
     311             :         /* state change might impact lockless readers. */
     312         714 :         return smp_load_acquire(&sk->sk_state);
     313             : }
     314             : 
     315             : /**
     316             :  * inet_sk_state_store - update sk->sk_state
     317             :  * @sk: socket pointer
     318             :  * @newstate: new state
     319             :  *
     320             :  * Paired with inet_sk_state_load(). Should be used in contexts where
     321             :  * state change might impact lockless readers.
     322             :  */
     323             : void inet_sk_state_store(struct sock *sk, int newstate);
     324             : 
     325             : void inet_sk_set_state(struct sock *sk, int state);
     326             : 
     327         450 : static inline unsigned int __inet_ehashfn(const __be32 laddr,
     328             :                                           const __u16 lport,
     329             :                                           const __be32 faddr,
     330             :                                           const __be16 fport,
     331             :                                           u32 initval)
     332             : {
     333         450 :         return jhash_3words((__force __u32) laddr,
     334             :                             (__force __u32) faddr,
     335         450 :                             ((__u32) lport) << 16 | (__force __u32)fport,
     336             :                             initval);
     337             : }
     338             : 
     339             : struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
     340             :                                       struct sock *sk_listener,
     341             :                                       bool attach_listener);
     342             : 
     343          12 : static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
     344             : {
     345          12 :         __u8 flags = 0;
     346             : 
     347          12 :         if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
     348             :                 flags |= FLOWI_FLAG_ANYSRC;
     349          12 :         return flags;
     350             : }
     351             : 
     352           0 : static inline void inet_inc_convert_csum(struct sock *sk)
     353             : {
     354           0 :         inet_sk(sk)->convert_csum++;
     355             : }
     356             : 
     357           0 : static inline void inet_dec_convert_csum(struct sock *sk)
     358             : {
     359           0 :         if (inet_sk(sk)->convert_csum > 0)
     360           0 :                 inet_sk(sk)->convert_csum--;
     361             : }
     362             : 
     363           0 : static inline bool inet_get_convert_csum(struct sock *sk)
     364             : {
     365           0 :         return !!inet_sk(sk)->convert_csum;
     366             : }
     367             : 
     368             : 
     369           5 : static inline bool inet_can_nonlocal_bind(struct net *net,
     370             :                                           struct inet_sock *inet)
     371             : {
     372           5 :         return net->ipv4.sysctl_ip_nonlocal_bind ||
     373          10 :                 inet->freebind || inet->transparent;
     374             : }
     375             : 
     376             : #endif  /* _INET_SOCK_H */

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