[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/net/ipv4/af_inet.c b/src/kernel/linux/v4.14/net/ipv4/af_inet.c
new file mode 100644
index 0000000..c16634d
--- /dev/null
+++ b/src/kernel/linux/v4.14/net/ipv4/af_inet.c
@@ -0,0 +1,1999 @@
+/*
+ * 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.
+ *
+ * PF_INET protocol family socket handler.
+ *
+ * Authors: Ross Biro
+ * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ * Florian La Roche, <flla@stud.uni-sb.de>
+ * Alan Cox, <A.Cox@swansea.ac.uk>
+ *
+ * Changes (see also sock.c)
+ *
+ * piggy,
+ * Karl Knutson : Socket protocol table
+ * A.N.Kuznetsov : Socket death error in accept().
+ * John Richardson : Fix non blocking error in connect()
+ * so sockets that fail to connect
+ * don't return -EINPROGRESS.
+ * Alan Cox : Asynchronous I/O support
+ * Alan Cox : Keep correct socket pointer on sock
+ * structures
+ * when accept() ed
+ * Alan Cox : Semantics of SO_LINGER aren't state
+ * moved to close when you look carefully.
+ * With this fixed and the accept bug fixed
+ * some RPC stuff seems happier.
+ * Niibe Yutaka : 4.4BSD style write async I/O
+ * Alan Cox,
+ * Tony Gale : Fixed reuse semantics.
+ * Alan Cox : bind() shouldn't abort existing but dead
+ * sockets. Stops FTP netin:.. I hope.
+ * Alan Cox : bind() works correctly for RAW sockets.
+ * Note that FreeBSD at least was broken
+ * in this respect so be careful with
+ * compatibility tests...
+ * Alan Cox : routing cache support
+ * Alan Cox : memzero the socket structure for
+ * compactness.
+ * Matt Day : nonblock connect error handler
+ * Alan Cox : Allow large numbers of pending sockets
+ * (eg for big web sites), but only if
+ * specifically application requested.
+ * Alan Cox : New buffering throughout IP. Used
+ * dumbly.
+ * Alan Cox : New buffering now used smartly.
+ * Alan Cox : BSD rather than common sense
+ * interpretation of listen.
+ * Germano Caronni : Assorted small races.
+ * Alan Cox : sendmsg/recvmsg basic support.
+ * Alan Cox : Only sendmsg/recvmsg now supported.
+ * Alan Cox : Locked down bind (see security list).
+ * Alan Cox : Loosened bind a little.
+ * Mike McLagan : ADD/DEL DLCI Ioctls
+ * Willy Konynenberg : Transparent proxying support.
+ * David S. Miller : New socket lookup architecture.
+ * Some other random speedups.
+ * Cyrus Durgin : Cleaned up file for kmod hacks.
+ * Andi Kleen : Fix inet_stream_connect TCP race.
+ *
+ * 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.
+ */
+
+#define pr_fmt(fmt) "IPv4: " fmt
+
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/kmod.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/capability.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+#include <linux/netfilter/xt_qtaguid.h>
+
+#include <linux/uaccess.h>
+
+#include <linux/inet.h>
+#include <linux/igmp.h>
+#include <linux/inetdevice.h>
+#include <linux/netdevice.h>
+#include <net/checksum.h>
+#include <net/ip.h>
+#include <net/protocol.h>
+#include <net/arp.h>
+#include <net/route.h>
+#include <net/ip_fib.h>
+#include <net/inet_connection_sock.h>
+#include <net/tcp.h>
+#include <net/udp.h>
+#include <net/udplite.h>
+#include <net/ping.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/raw.h>
+#include <net/icmp.h>
+#include <net/inet_common.h>
+#include <net/ip_tunnels.h>
+#include <net/xfrm.h>
+#include <net/net_namespace.h>
+#include <net/secure_seq.h>
+#ifdef CONFIG_IP_MROUTE
+#include <linux/mroute.h>
+#endif
+#include <net/l3mdev.h>
+
+#ifdef CONFIG_ANDROID_PARANOID_NETWORK
+#include <linux/android_aid.h>
+
+static inline int current_has_network(void)
+{
+ return in_egroup_p(AID_INET) || capable(CAP_NET_RAW);
+}
+#else
+static inline int current_has_network(void)
+{
+ return 1;
+}
+#endif
+
+/* The inetsw table contains everything that inet_create needs to
+ * build a new socket.
+ */
+static struct list_head inetsw[SOCK_MAX];
+static DEFINE_SPINLOCK(inetsw_lock);
+
+/* New destruction routine */
+
+void inet_sock_destruct(struct sock *sk)
+{
+ struct inet_sock *inet = inet_sk(sk);
+
+ __skb_queue_purge(&sk->sk_receive_queue);
+ __skb_queue_purge(&sk->sk_error_queue);
+
+ sk_mem_reclaim(sk);
+
+ if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
+ pr_err("Attempt to release TCP socket in state %d %p\n",
+ sk->sk_state, sk);
+ return;
+ }
+ if (!sock_flag(sk, SOCK_DEAD)) {
+ pr_err("Attempt to release alive inet socket %p\n", sk);
+ return;
+ }
+
+ WARN_ON(atomic_read(&sk->sk_rmem_alloc));
+ WARN_ON(refcount_read(&sk->sk_wmem_alloc));
+ WARN_ON(sk->sk_wmem_queued);
+ WARN_ON(sk->sk_forward_alloc);
+
+ kfree(rcu_dereference_protected(inet->inet_opt, 1));
+ dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
+ dst_release(sk->sk_rx_dst);
+ sk_refcnt_debug_dec(sk);
+}
+EXPORT_SYMBOL(inet_sock_destruct);
+
+/*
+ * The routines beyond this point handle the behaviour of an AF_INET
+ * socket object. Mostly it punts to the subprotocols of IP to do
+ * the work.
+ */
+
+/*
+ * Automatically bind an unbound socket.
+ */
+
+static int inet_autobind(struct sock *sk)
+{
+ struct inet_sock *inet;
+ /* We may need to bind the socket. */
+ lock_sock(sk);
+ inet = inet_sk(sk);
+ if (!inet->inet_num) {
+ if (sk->sk_prot->get_port(sk, 0)) {
+ release_sock(sk);
+ return -EAGAIN;
+ }
+ inet->inet_sport = htons(inet->inet_num);
+ }
+ release_sock(sk);
+ return 0;
+}
+
+/*
+ * Move a socket into listening state.
+ */
+int inet_listen(struct socket *sock, int backlog)
+{
+ struct sock *sk = sock->sk;
+ unsigned char old_state;
+ int err;
+
+ lock_sock(sk);
+
+ err = -EINVAL;
+ if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
+ goto out;
+
+ old_state = sk->sk_state;
+ if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
+ goto out;
+
+ /* Really, if the socket is already in listen state
+ * we can only allow the backlog to be adjusted.
+ */
+ if (old_state != TCP_LISTEN) {
+ /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
+ * Note that only TCP sockets (SOCK_STREAM) will reach here.
+ * Also fastopen backlog may already been set via the option
+ * because the socket was in TCP_LISTEN state previously but
+ * was shutdown() rather than close().
+ */
+ if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
+ (sysctl_tcp_fastopen & TFO_SERVER_ENABLE) &&
+ !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
+ fastopen_queue_tune(sk, backlog);
+ tcp_fastopen_init_key_once(true);
+ }
+
+ err = inet_csk_listen_start(sk, backlog);
+ if (err)
+ goto out;
+ }
+ sk->sk_max_ack_backlog = backlog;
+ err = 0;
+
+out:
+ release_sock(sk);
+ return err;
+}
+EXPORT_SYMBOL(inet_listen);
+
+/*
+ * Create an inet socket.
+ */
+
+static int inet_create(struct net *net, struct socket *sock, int protocol,
+ int kern)
+{
+ struct sock *sk;
+ struct inet_protosw *answer;
+ struct inet_sock *inet;
+ struct proto *answer_prot;
+ unsigned char answer_flags;
+ int try_loading_module = 0;
+ int err;
+
+ if (protocol < 0 || protocol >= IPPROTO_MAX)
+ return -EINVAL;
+
+ if (!current_has_network())
+ return -EACCES;
+
+ sock->state = SS_UNCONNECTED;
+
+ /* Look for the requested type/protocol pair. */
+lookup_protocol:
+ err = -ESOCKTNOSUPPORT;
+ rcu_read_lock();
+ list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
+
+ err = 0;
+ /* Check the non-wild match. */
+ if (protocol == answer->protocol) {
+ if (protocol != IPPROTO_IP)
+ break;
+ } else {
+ /* Check for the two wild cases. */
+ if (IPPROTO_IP == protocol) {
+ protocol = answer->protocol;
+ break;
+ }
+ if (IPPROTO_IP == answer->protocol)
+ break;
+ }
+ err = -EPROTONOSUPPORT;
+ }
+
+ if (unlikely(err)) {
+ if (try_loading_module < 2) {
+ rcu_read_unlock();
+ /*
+ * Be more specific, e.g. net-pf-2-proto-132-type-1
+ * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
+ */
+ if (++try_loading_module == 1)
+ request_module("net-pf-%d-proto-%d-type-%d",
+ PF_INET, protocol, sock->type);
+ /*
+ * Fall back to generic, e.g. net-pf-2-proto-132
+ * (net-pf-PF_INET-proto-IPPROTO_SCTP)
+ */
+ else
+ request_module("net-pf-%d-proto-%d",
+ PF_INET, protocol);
+ goto lookup_protocol;
+ } else
+ goto out_rcu_unlock;
+ }
+
+ err = -EPERM;
+ if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
+ goto out_rcu_unlock;
+
+ sock->ops = answer->ops;
+ answer_prot = answer->prot;
+ answer_flags = answer->flags;
+ rcu_read_unlock();
+
+ WARN_ON(!answer_prot->slab);
+
+ err = -ENOBUFS;
+ sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
+ if (!sk)
+ goto out;
+
+ err = 0;
+ if (INET_PROTOSW_REUSE & answer_flags)
+ sk->sk_reuse = SK_CAN_REUSE;
+
+ inet = inet_sk(sk);
+ inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
+
+ inet->nodefrag = 0;
+
+ if (SOCK_RAW == sock->type) {
+ inet->inet_num = protocol;
+ if (IPPROTO_RAW == protocol)
+ inet->hdrincl = 1;
+ }
+
+ if (net->ipv4.sysctl_ip_no_pmtu_disc)
+ inet->pmtudisc = IP_PMTUDISC_DONT;
+ else
+ inet->pmtudisc = IP_PMTUDISC_WANT;
+
+ inet->inet_id = 0;
+
+ sock_init_data(sock, sk);
+
+ sk->sk_destruct = inet_sock_destruct;
+ sk->sk_protocol = protocol;
+ sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
+
+ inet->uc_ttl = -1;
+ inet->mc_loop = 1;
+ inet->mc_ttl = 1;
+ inet->mc_all = 1;
+ inet->mc_index = 0;
+ inet->mc_list = NULL;
+ inet->rcv_tos = 0;
+
+ sk_refcnt_debug_inc(sk);
+
+ if (inet->inet_num) {
+ /* It assumes that any protocol which allows
+ * the user to assign a number at socket
+ * creation time automatically
+ * shares.
+ */
+ inet->inet_sport = htons(inet->inet_num);
+ /* Add to protocol hash chains. */
+ err = sk->sk_prot->hash(sk);
+ if (err) {
+ sk_common_release(sk);
+ goto out;
+ }
+ }
+
+ if (sk->sk_prot->init) {
+ err = sk->sk_prot->init(sk);
+ if (err) {
+ sk_common_release(sk);
+ goto out;
+ }
+ }
+
+ if (!kern) {
+ err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
+ if (err) {
+ sk_common_release(sk);
+ goto out;
+ }
+ }
+out:
+ return err;
+out_rcu_unlock:
+ rcu_read_unlock();
+ goto out;
+}
+
+
+/*
+ * The peer socket should always be NULL (or else). When we call this
+ * function we are destroying the object and from then on nobody
+ * should refer to it.
+ */
+int inet_release(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+
+ if (sk) {
+ long timeout;
+
+#ifdef CONFIG_NETFILTER_XT_MATCH_QTAGUID
+ qtaguid_untag(sock, true);
+#endif
+ /* Applications forget to leave groups before exiting */
+ ip_mc_drop_socket(sk);
+
+ /* If linger is set, we don't return until the close
+ * is complete. Otherwise we return immediately. The
+ * actually closing is done the same either way.
+ *
+ * If the close is due to the process exiting, we never
+ * linger..
+ */
+ timeout = 0;
+ if (sock_flag(sk, SOCK_LINGER) &&
+ !(current->flags & PF_EXITING))
+ timeout = sk->sk_lingertime;
+ sock->sk = NULL;
+ sk->sk_prot->close(sk, timeout);
+ }
+ return 0;
+}
+EXPORT_SYMBOL(inet_release);
+
+int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
+{
+ struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
+ struct sock *sk = sock->sk;
+ struct inet_sock *inet = inet_sk(sk);
+ struct net *net = sock_net(sk);
+ unsigned short snum;
+ int chk_addr_ret;
+ u32 tb_id = RT_TABLE_LOCAL;
+ int err;
+
+ /* If the socket has its own bind function then use it. (RAW) */
+ if (sk->sk_prot->bind) {
+ err = sk->sk_prot->bind(sk, uaddr, addr_len);
+ goto out;
+ }
+ err = -EINVAL;
+ if (addr_len < sizeof(struct sockaddr_in))
+ goto out;
+
+ if (addr->sin_family != AF_INET) {
+ /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
+ * only if s_addr is INADDR_ANY.
+ */
+ err = -EAFNOSUPPORT;
+ if (addr->sin_family != AF_UNSPEC ||
+ addr->sin_addr.s_addr != htonl(INADDR_ANY))
+ goto out;
+ }
+
+ tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
+ chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
+
+ /* Not specified by any standard per-se, however it breaks too
+ * many applications when removed. It is unfortunate since
+ * allowing applications to make a non-local bind solves
+ * several problems with systems using dynamic addressing.
+ * (ie. your servers still start up even if your ISDN link
+ * is temporarily down)
+ */
+ err = -EADDRNOTAVAIL;
+ if (!net->ipv4.sysctl_ip_nonlocal_bind &&
+ !(inet->freebind || inet->transparent) &&
+ addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
+ chk_addr_ret != RTN_LOCAL &&
+ chk_addr_ret != RTN_MULTICAST &&
+ chk_addr_ret != RTN_BROADCAST)
+ goto out;
+
+ snum = ntohs(addr->sin_port);
+ err = -EACCES;
+ if (snum && snum < inet_prot_sock(net) &&
+ !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
+ goto out;
+
+ /* We keep a pair of addresses. rcv_saddr is the one
+ * used by hash lookups, and saddr is used for transmit.
+ *
+ * In the BSD API these are the same except where it
+ * would be illegal to use them (multicast/broadcast) in
+ * which case the sending device address is used.
+ */
+ lock_sock(sk);
+
+ /* Check these errors (active socket, double bind). */
+ err = -EINVAL;
+ if (sk->sk_state != TCP_CLOSE || inet->inet_num)
+ goto out_release_sock;
+
+ inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
+ if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
+ inet->inet_saddr = 0; /* Use device */
+
+ /* Make sure we are allowed to bind here. */
+ if ((snum || !inet->bind_address_no_port) &&
+ sk->sk_prot->get_port(sk, snum)) {
+ inet->inet_saddr = inet->inet_rcv_saddr = 0;
+ err = -EADDRINUSE;
+ goto out_release_sock;
+ }
+
+ if (inet->inet_rcv_saddr)
+ sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
+ if (snum)
+ sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
+ inet->inet_sport = htons(inet->inet_num);
+ inet->inet_daddr = 0;
+ inet->inet_dport = 0;
+ sk_dst_reset(sk);
+ err = 0;
+out_release_sock:
+ release_sock(sk);
+out:
+ return err;
+}
+EXPORT_SYMBOL(inet_bind);
+
+int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
+ int addr_len, int flags)
+{
+ struct sock *sk = sock->sk;
+
+ if (addr_len < sizeof(uaddr->sa_family))
+ return -EINVAL;
+ if (uaddr->sa_family == AF_UNSPEC)
+ return sk->sk_prot->disconnect(sk, flags);
+
+ if (!inet_sk(sk)->inet_num && inet_autobind(sk))
+ return -EAGAIN;
+ return sk->sk_prot->connect(sk, uaddr, addr_len);
+}
+EXPORT_SYMBOL(inet_dgram_connect);
+
+static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
+{
+ DEFINE_WAIT_FUNC(wait, woken_wake_function);
+
+ add_wait_queue(sk_sleep(sk), &wait);
+ sk->sk_write_pending += writebias;
+
+ /* Basic assumption: if someone sets sk->sk_err, he _must_
+ * change state of the socket from TCP_SYN_*.
+ * Connect() does not allow to get error notifications
+ * without closing the socket.
+ */
+ while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
+ release_sock(sk);
+ timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
+ lock_sock(sk);
+ if (signal_pending(current) || !timeo)
+ break;
+ }
+ remove_wait_queue(sk_sleep(sk), &wait);
+ sk->sk_write_pending -= writebias;
+ return timeo;
+}
+
+/*
+ * Connect to a remote host. There is regrettably still a little
+ * TCP 'magic' in here.
+ */
+int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
+ int addr_len, int flags, int is_sendmsg)
+{
+ struct sock *sk = sock->sk;
+ int err;
+ long timeo;
+
+ /*
+ * uaddr can be NULL and addr_len can be 0 if:
+ * sk is a TCP fastopen active socket and
+ * TCP_FASTOPEN_CONNECT sockopt is set and
+ * we already have a valid cookie for this socket.
+ * In this case, user can call write() after connect().
+ * write() will invoke tcp_sendmsg_fastopen() which calls
+ * __inet_stream_connect().
+ */
+ if (uaddr) {
+ if (addr_len < sizeof(uaddr->sa_family))
+ return -EINVAL;
+
+ if (uaddr->sa_family == AF_UNSPEC) {
+ err = sk->sk_prot->disconnect(sk, flags);
+ sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
+ goto out;
+ }
+ }
+
+ switch (sock->state) {
+ default:
+ err = -EINVAL;
+ goto out;
+ case SS_CONNECTED:
+ err = -EISCONN;
+ goto out;
+ case SS_CONNECTING:
+ if (inet_sk(sk)->defer_connect)
+ err = is_sendmsg ? -EINPROGRESS : -EISCONN;
+ else
+ err = -EALREADY;
+ /* Fall out of switch with err, set for this state */
+ break;
+ case SS_UNCONNECTED:
+ err = -EISCONN;
+ if (sk->sk_state != TCP_CLOSE)
+ goto out;
+
+ err = sk->sk_prot->connect(sk, uaddr, addr_len);
+ if (err < 0)
+ goto out;
+
+ sock->state = SS_CONNECTING;
+
+ if (!err && inet_sk(sk)->defer_connect)
+ goto out;
+
+ /* Just entered SS_CONNECTING state; the only
+ * difference is that return value in non-blocking
+ * case is EINPROGRESS, rather than EALREADY.
+ */
+ err = -EINPROGRESS;
+ break;
+ }
+
+ timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
+
+ if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
+ int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
+ tcp_sk(sk)->fastopen_req &&
+ tcp_sk(sk)->fastopen_req->data ? 1 : 0;
+
+ /* Error code is set above */
+ if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
+ goto out;
+
+ err = sock_intr_errno(timeo);
+ if (signal_pending(current))
+ goto out;
+ }
+
+ /* Connection was closed by RST, timeout, ICMP error
+ * or another process disconnected us.
+ */
+ if (sk->sk_state == TCP_CLOSE)
+ goto sock_error;
+
+ /* sk->sk_err may be not zero now, if RECVERR was ordered by user
+ * and error was received after socket entered established state.
+ * Hence, it is handled normally after connect() return successfully.
+ */
+
+ sock->state = SS_CONNECTED;
+ err = 0;
+out:
+ return err;
+
+sock_error:
+ err = sock_error(sk) ? : -ECONNABORTED;
+ sock->state = SS_UNCONNECTED;
+ if (sk->sk_prot->disconnect(sk, flags))
+ sock->state = SS_DISCONNECTING;
+ goto out;
+}
+EXPORT_SYMBOL(__inet_stream_connect);
+
+int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
+ int addr_len, int flags)
+{
+ int err;
+
+ lock_sock(sock->sk);
+ err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
+ release_sock(sock->sk);
+ return err;
+}
+EXPORT_SYMBOL(inet_stream_connect);
+
+/*
+ * Accept a pending connection. The TCP layer now gives BSD semantics.
+ */
+
+int inet_accept(struct socket *sock, struct socket *newsock, int flags,
+ bool kern)
+{
+ struct sock *sk1 = sock->sk;
+ int err = -EINVAL;
+ struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern);
+
+ if (!sk2)
+ goto do_err;
+
+ lock_sock(sk2);
+
+ sock_rps_record_flow(sk2);
+ WARN_ON(!((1 << sk2->sk_state) &
+ (TCPF_ESTABLISHED | TCPF_SYN_RECV |
+ TCPF_CLOSE_WAIT | TCPF_CLOSE)));
+
+ sock_graft(sk2, newsock);
+
+ newsock->state = SS_CONNECTED;
+ err = 0;
+ release_sock(sk2);
+do_err:
+ return err;
+}
+EXPORT_SYMBOL(inet_accept);
+
+
+/*
+ * This does both peername and sockname.
+ */
+int inet_getname(struct socket *sock, struct sockaddr *uaddr,
+ int *uaddr_len, int peer)
+{
+ struct sock *sk = sock->sk;
+ struct inet_sock *inet = inet_sk(sk);
+ DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
+
+ sin->sin_family = AF_INET;
+ if (peer) {
+ if (!inet->inet_dport ||
+ (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
+ peer == 1))
+ return -ENOTCONN;
+ sin->sin_port = inet->inet_dport;
+ sin->sin_addr.s_addr = inet->inet_daddr;
+ } else {
+ __be32 addr = inet->inet_rcv_saddr;
+ if (!addr)
+ addr = inet->inet_saddr;
+ sin->sin_port = inet->inet_sport;
+ sin->sin_addr.s_addr = addr;
+ }
+ memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
+ *uaddr_len = sizeof(*sin);
+ return 0;
+}
+EXPORT_SYMBOL(inet_getname);
+
+int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
+{
+ struct sock *sk = sock->sk;
+
+ sock_rps_record_flow(sk);
+
+ /* We may need to bind the socket. */
+ if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
+ inet_autobind(sk))
+ return -EAGAIN;
+
+ return sk->sk_prot->sendmsg(sk, msg, size);
+}
+EXPORT_SYMBOL(inet_sendmsg);
+
+ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
+ size_t size, int flags)
+{
+ struct sock *sk = sock->sk;
+
+ sock_rps_record_flow(sk);
+
+ /* We may need to bind the socket. */
+ if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
+ inet_autobind(sk))
+ return -EAGAIN;
+
+ if (sk->sk_prot->sendpage)
+ return sk->sk_prot->sendpage(sk, page, offset, size, flags);
+ return sock_no_sendpage(sock, page, offset, size, flags);
+}
+EXPORT_SYMBOL(inet_sendpage);
+
+int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
+ int flags)
+{
+ struct sock *sk = sock->sk;
+ int addr_len = 0;
+ int err;
+
+ sock_rps_record_flow(sk);
+
+ err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
+ flags & ~MSG_DONTWAIT, &addr_len);
+ if (err >= 0)
+ msg->msg_namelen = addr_len;
+ return err;
+}
+EXPORT_SYMBOL(inet_recvmsg);
+
+int inet_shutdown(struct socket *sock, int how)
+{
+ struct sock *sk = sock->sk;
+ int err = 0;
+
+ /* This should really check to make sure
+ * the socket is a TCP socket. (WHY AC...)
+ */
+ how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
+ 1->2 bit 2 snds.
+ 2->3 */
+ if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
+ return -EINVAL;
+
+ lock_sock(sk);
+ if (sock->state == SS_CONNECTING) {
+ if ((1 << sk->sk_state) &
+ (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
+ sock->state = SS_DISCONNECTING;
+ else
+ sock->state = SS_CONNECTED;
+ }
+
+ switch (sk->sk_state) {
+ case TCP_CLOSE:
+ err = -ENOTCONN;
+ /* Hack to wake up other listeners, who can poll for
+ POLLHUP, even on eg. unconnected UDP sockets -- RR */
+ default:
+ sk->sk_shutdown |= how;
+ if (sk->sk_prot->shutdown)
+ sk->sk_prot->shutdown(sk, how);
+ break;
+
+ /* Remaining two branches are temporary solution for missing
+ * close() in multithreaded environment. It is _not_ a good idea,
+ * but we have no choice until close() is repaired at VFS level.
+ */
+ case TCP_LISTEN:
+ if (!(how & RCV_SHUTDOWN))
+ break;
+ /* Fall through */
+ case TCP_SYN_SENT:
+ err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
+ sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
+ break;
+ }
+
+ /* Wake up anyone sleeping in poll. */
+ sk->sk_state_change(sk);
+ release_sock(sk);
+ return err;
+}
+EXPORT_SYMBOL(inet_shutdown);
+
+/*
+ * ioctl() calls you can issue on an INET socket. Most of these are
+ * device configuration and stuff and very rarely used. Some ioctls
+ * pass on to the socket itself.
+ *
+ * NOTE: I like the idea of a module for the config stuff. ie ifconfig
+ * loads the devconfigure module does its configuring and unloads it.
+ * There's a good 20K of config code hanging around the kernel.
+ */
+
+int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ struct sock *sk = sock->sk;
+ int err = 0;
+ struct net *net = sock_net(sk);
+
+ switch (cmd) {
+ case SIOCGSTAMP:
+ err = sock_get_timestamp(sk, (struct timeval __user *)arg);
+ break;
+ case SIOCGSTAMPNS:
+ err = sock_get_timestampns(sk, (struct timespec __user *)arg);
+ break;
+ case SIOCADDRT:
+ case SIOCDELRT:
+ case SIOCRTMSG:
+ err = ip_rt_ioctl(net, cmd, (void __user *)arg);
+ break;
+ case SIOCDARP:
+ case SIOCGARP:
+ case SIOCSARP:
+ err = arp_ioctl(net, cmd, (void __user *)arg);
+ break;
+ case SIOCGIFADDR:
+ case SIOCSIFADDR:
+ case SIOCGIFBRDADDR:
+ case SIOCSIFBRDADDR:
+ case SIOCGIFNETMASK:
+ case SIOCSIFNETMASK:
+ case SIOCGIFDSTADDR:
+ case SIOCSIFDSTADDR:
+ case SIOCSIFPFLAGS:
+ case SIOCGIFPFLAGS:
+ case SIOCSIFFLAGS:
+ err = devinet_ioctl(net, cmd, (void __user *)arg);
+ break;
+ default:
+ if (sk->sk_prot->ioctl)
+ err = sk->sk_prot->ioctl(sk, cmd, arg);
+ else
+ err = -ENOIOCTLCMD;
+ break;
+ }
+ return err;
+}
+EXPORT_SYMBOL(inet_ioctl);
+
+#ifdef CONFIG_COMPAT
+static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ struct sock *sk = sock->sk;
+ int err = -ENOIOCTLCMD;
+
+ if (sk->sk_prot->compat_ioctl)
+ err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
+
+ return err;
+}
+#endif
+
+const struct proto_ops inet_stream_ops = {
+ .family = PF_INET,
+ .owner = THIS_MODULE,
+ .release = inet_release,
+ .bind = inet_bind,
+ .connect = inet_stream_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = inet_accept,
+ .getname = inet_getname,
+ .poll = tcp_poll,
+ .ioctl = inet_ioctl,
+ .listen = inet_listen,
+ .shutdown = inet_shutdown,
+ .setsockopt = sock_common_setsockopt,
+ .getsockopt = sock_common_getsockopt,
+ .sendmsg = inet_sendmsg,
+ .recvmsg = inet_recvmsg,
+ .mmap = sock_no_mmap,
+ .sendpage = inet_sendpage,
+ .splice_read = tcp_splice_read,
+ .read_sock = tcp_read_sock,
+ .sendmsg_locked = tcp_sendmsg_locked,
+ .sendpage_locked = tcp_sendpage_locked,
+ .peek_len = tcp_peek_len,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_sock_common_setsockopt,
+ .compat_getsockopt = compat_sock_common_getsockopt,
+ .compat_ioctl = inet_compat_ioctl,
+#endif
+};
+EXPORT_SYMBOL(inet_stream_ops);
+
+const struct proto_ops inet_dgram_ops = {
+ .family = PF_INET,
+ .owner = THIS_MODULE,
+ .release = inet_release,
+ .bind = inet_bind,
+ .connect = inet_dgram_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = sock_no_accept,
+ .getname = inet_getname,
+ .poll = udp_poll,
+ .ioctl = inet_ioctl,
+ .listen = sock_no_listen,
+ .shutdown = inet_shutdown,
+ .setsockopt = sock_common_setsockopt,
+ .getsockopt = sock_common_getsockopt,
+ .sendmsg = inet_sendmsg,
+ .recvmsg = inet_recvmsg,
+ .mmap = sock_no_mmap,
+ .sendpage = inet_sendpage,
+ .set_peek_off = sk_set_peek_off,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_sock_common_setsockopt,
+ .compat_getsockopt = compat_sock_common_getsockopt,
+ .compat_ioctl = inet_compat_ioctl,
+#endif
+};
+EXPORT_SYMBOL(inet_dgram_ops);
+
+/*
+ * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
+ * udp_poll
+ */
+static const struct proto_ops inet_sockraw_ops = {
+ .family = PF_INET,
+ .owner = THIS_MODULE,
+ .release = inet_release,
+ .bind = inet_bind,
+ .connect = inet_dgram_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = sock_no_accept,
+ .getname = inet_getname,
+ .poll = datagram_poll,
+ .ioctl = inet_ioctl,
+ .listen = sock_no_listen,
+ .shutdown = inet_shutdown,
+ .setsockopt = sock_common_setsockopt,
+ .getsockopt = sock_common_getsockopt,
+ .sendmsg = inet_sendmsg,
+ .recvmsg = inet_recvmsg,
+ .mmap = sock_no_mmap,
+ .sendpage = inet_sendpage,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_sock_common_setsockopt,
+ .compat_getsockopt = compat_sock_common_getsockopt,
+ .compat_ioctl = inet_compat_ioctl,
+#endif
+};
+
+static const struct net_proto_family inet_family_ops = {
+ .family = PF_INET,
+ .create = inet_create,
+ .owner = THIS_MODULE,
+};
+
+/* Upon startup we insert all the elements in inetsw_array[] into
+ * the linked list inetsw.
+ */
+static struct inet_protosw inetsw_array[] =
+{
+ {
+ .type = SOCK_STREAM,
+ .protocol = IPPROTO_TCP,
+ .prot = &tcp_prot,
+ .ops = &inet_stream_ops,
+ .flags = INET_PROTOSW_PERMANENT |
+ INET_PROTOSW_ICSK,
+ },
+
+ {
+ .type = SOCK_DGRAM,
+ .protocol = IPPROTO_UDP,
+ .prot = &udp_prot,
+ .ops = &inet_dgram_ops,
+ .flags = INET_PROTOSW_PERMANENT,
+ },
+
+ {
+ .type = SOCK_DGRAM,
+ .protocol = IPPROTO_ICMP,
+ .prot = &ping_prot,
+ .ops = &inet_sockraw_ops,
+ .flags = INET_PROTOSW_REUSE,
+ },
+
+ {
+ .type = SOCK_RAW,
+ .protocol = IPPROTO_IP, /* wild card */
+ .prot = &raw_prot,
+ .ops = &inet_sockraw_ops,
+ .flags = INET_PROTOSW_REUSE,
+ }
+};
+
+#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
+
+void inet_register_protosw(struct inet_protosw *p)
+{
+ struct list_head *lh;
+ struct inet_protosw *answer;
+ int protocol = p->protocol;
+ struct list_head *last_perm;
+
+ spin_lock_bh(&inetsw_lock);
+
+ if (p->type >= SOCK_MAX)
+ goto out_illegal;
+
+ /* If we are trying to override a permanent protocol, bail. */
+ last_perm = &inetsw[p->type];
+ list_for_each(lh, &inetsw[p->type]) {
+ answer = list_entry(lh, struct inet_protosw, list);
+ /* Check only the non-wild match. */
+ if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
+ break;
+ if (protocol == answer->protocol)
+ goto out_permanent;
+ last_perm = lh;
+ }
+
+ /* Add the new entry after the last permanent entry if any, so that
+ * the new entry does not override a permanent entry when matched with
+ * a wild-card protocol. But it is allowed to override any existing
+ * non-permanent entry. This means that when we remove this entry, the
+ * system automatically returns to the old behavior.
+ */
+ list_add_rcu(&p->list, last_perm);
+out:
+ spin_unlock_bh(&inetsw_lock);
+
+ return;
+
+out_permanent:
+ pr_err("Attempt to override permanent protocol %d\n", protocol);
+ goto out;
+
+out_illegal:
+ pr_err("Ignoring attempt to register invalid socket type %d\n",
+ p->type);
+ goto out;
+}
+EXPORT_SYMBOL(inet_register_protosw);
+
+void inet_unregister_protosw(struct inet_protosw *p)
+{
+ if (INET_PROTOSW_PERMANENT & p->flags) {
+ pr_err("Attempt to unregister permanent protocol %d\n",
+ p->protocol);
+ } else {
+ spin_lock_bh(&inetsw_lock);
+ list_del_rcu(&p->list);
+ spin_unlock_bh(&inetsw_lock);
+
+ synchronize_net();
+ }
+}
+EXPORT_SYMBOL(inet_unregister_protosw);
+
+static int inet_sk_reselect_saddr(struct sock *sk)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ __be32 old_saddr = inet->inet_saddr;
+ __be32 daddr = inet->inet_daddr;
+ struct flowi4 *fl4;
+ struct rtable *rt;
+ __be32 new_saddr;
+ struct ip_options_rcu *inet_opt;
+
+ inet_opt = rcu_dereference_protected(inet->inet_opt,
+ lockdep_sock_is_held(sk));
+ if (inet_opt && inet_opt->opt.srr)
+ daddr = inet_opt->opt.faddr;
+
+ /* Query new route. */
+ fl4 = &inet->cork.fl.u.ip4;
+ rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
+ sk->sk_bound_dev_if, sk->sk_protocol,
+ inet->inet_sport, inet->inet_dport, sk);
+ if (IS_ERR(rt))
+ return PTR_ERR(rt);
+
+ sk_setup_caps(sk, &rt->dst);
+
+ new_saddr = fl4->saddr;
+
+ if (new_saddr == old_saddr)
+ return 0;
+
+ if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) {
+ pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
+ __func__, &old_saddr, &new_saddr);
+ }
+
+ inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
+
+ /*
+ * XXX The only one ugly spot where we need to
+ * XXX really change the sockets identity after
+ * XXX it has entered the hashes. -DaveM
+ *
+ * Besides that, it does not check for connection
+ * uniqueness. Wait for troubles.
+ */
+ return __sk_prot_rehash(sk);
+}
+
+int inet_sk_rebuild_header(struct sock *sk)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
+ __be32 daddr;
+ struct ip_options_rcu *inet_opt;
+ struct flowi4 *fl4;
+ int err;
+
+ /* Route is OK, nothing to do. */
+ if (rt)
+ return 0;
+
+ /* Reroute. */
+ rcu_read_lock();
+ inet_opt = rcu_dereference(inet->inet_opt);
+ daddr = inet->inet_daddr;
+ if (inet_opt && inet_opt->opt.srr)
+ daddr = inet_opt->opt.faddr;
+ rcu_read_unlock();
+ fl4 = &inet->cork.fl.u.ip4;
+ rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
+ inet->inet_dport, inet->inet_sport,
+ sk->sk_protocol, RT_CONN_FLAGS(sk),
+ sk->sk_bound_dev_if);
+ if (!IS_ERR(rt)) {
+ err = 0;
+ sk_setup_caps(sk, &rt->dst);
+ } else {
+ err = PTR_ERR(rt);
+
+ /* Routing failed... */
+ sk->sk_route_caps = 0;
+ /*
+ * Other protocols have to map its equivalent state to TCP_SYN_SENT.
+ * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
+ */
+ if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr ||
+ sk->sk_state != TCP_SYN_SENT ||
+ (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
+ (err = inet_sk_reselect_saddr(sk)) != 0)
+ sk->sk_err_soft = -err;
+ }
+
+ return err;
+}
+EXPORT_SYMBOL(inet_sk_rebuild_header);
+
+struct sk_buff *inet_gso_segment(struct sk_buff *skb,
+ netdev_features_t features)
+{
+ bool udpfrag = false, fixedid = false, gso_partial, encap;
+ struct sk_buff *segs = ERR_PTR(-EINVAL);
+ const struct net_offload *ops;
+ unsigned int offset = 0;
+ struct iphdr *iph;
+ int proto, tot_len;
+ int nhoff;
+ int ihl;
+ int id;
+
+ skb_reset_network_header(skb);
+ nhoff = skb_network_header(skb) - skb_mac_header(skb);
+ if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
+ goto out;
+
+ iph = ip_hdr(skb);
+ ihl = iph->ihl * 4;
+ if (ihl < sizeof(*iph))
+ goto out;
+
+ id = ntohs(iph->id);
+ proto = iph->protocol;
+
+ /* Warning: after this point, iph might be no longer valid */
+ if (unlikely(!pskb_may_pull(skb, ihl)))
+ goto out;
+ __skb_pull(skb, ihl);
+
+ encap = SKB_GSO_CB(skb)->encap_level > 0;
+ if (encap)
+ features &= skb->dev->hw_enc_features;
+ SKB_GSO_CB(skb)->encap_level += ihl;
+
+ skb_reset_transport_header(skb);
+
+ segs = ERR_PTR(-EPROTONOSUPPORT);
+
+ if (!skb->encapsulation || encap) {
+ udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
+ fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
+
+ /* fixed ID is invalid if DF bit is not set */
+ if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
+ goto out;
+ }
+
+ ops = rcu_dereference(inet_offloads[proto]);
+ if (likely(ops && ops->callbacks.gso_segment))
+ segs = ops->callbacks.gso_segment(skb, features);
+
+ if (IS_ERR_OR_NULL(segs))
+ goto out;
+
+ gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
+
+ skb = segs;
+ do {
+ iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
+ if (udpfrag) {
+ iph->frag_off = htons(offset >> 3);
+ if (skb->next)
+ iph->frag_off |= htons(IP_MF);
+ offset += skb->len - nhoff - ihl;
+ tot_len = skb->len - nhoff;
+ } else if (skb_is_gso(skb)) {
+ if (!fixedid) {
+ iph->id = htons(id);
+ id += skb_shinfo(skb)->gso_segs;
+ }
+
+ if (gso_partial)
+ tot_len = skb_shinfo(skb)->gso_size +
+ SKB_GSO_CB(skb)->data_offset +
+ skb->head - (unsigned char *)iph;
+ else
+ tot_len = skb->len - nhoff;
+ } else {
+ if (!fixedid)
+ iph->id = htons(id++);
+ tot_len = skb->len - nhoff;
+ }
+ iph->tot_len = htons(tot_len);
+ ip_send_check(iph);
+ if (encap)
+ skb_reset_inner_headers(skb);
+ skb->network_header = (u8 *)iph - skb->head;
+ skb_reset_mac_len(skb);
+ } while ((skb = skb->next));
+
+out:
+ return segs;
+}
+EXPORT_SYMBOL(inet_gso_segment);
+
+struct sk_buff **inet_gro_receive(struct sk_buff **head, struct sk_buff *skb)
+{
+ const struct net_offload *ops;
+ struct sk_buff **pp = NULL;
+ struct sk_buff *p;
+ const struct iphdr *iph;
+ unsigned int hlen;
+ unsigned int off;
+ unsigned int id;
+ int flush = 1;
+ int proto;
+
+ off = skb_gro_offset(skb);
+ hlen = off + sizeof(*iph);
+ iph = skb_gro_header_fast(skb, off);
+ if (skb_gro_header_hard(skb, hlen)) {
+ iph = skb_gro_header_slow(skb, hlen, off);
+ if (unlikely(!iph))
+ goto out;
+ }
+
+ proto = iph->protocol;
+
+ rcu_read_lock();
+ ops = rcu_dereference(inet_offloads[proto]);
+ if (!ops || !ops->callbacks.gro_receive)
+ goto out_unlock;
+
+ if (*(u8 *)iph != 0x45)
+ goto out_unlock;
+
+ if (ip_is_fragment(iph))
+ goto out_unlock;
+
+ if (unlikely(ip_fast_csum((u8 *)iph, 5)))
+ goto out_unlock;
+
+ id = ntohl(*(__be32 *)&iph->id);
+ flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
+ id >>= 16;
+
+ for (p = *head; p; p = p->next) {
+ struct iphdr *iph2;
+ u16 flush_id;
+
+ if (!NAPI_GRO_CB(p)->same_flow)
+ continue;
+
+ iph2 = (struct iphdr *)(p->data + off);
+ /* The above works because, with the exception of the top
+ * (inner most) layer, we only aggregate pkts with the same
+ * hdr length so all the hdrs we'll need to verify will start
+ * at the same offset.
+ */
+ if ((iph->protocol ^ iph2->protocol) |
+ ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
+ ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
+ NAPI_GRO_CB(p)->same_flow = 0;
+ continue;
+ }
+
+ /* All fields must match except length and checksum. */
+ NAPI_GRO_CB(p)->flush |=
+ (iph->ttl ^ iph2->ttl) |
+ (iph->tos ^ iph2->tos) |
+ ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
+
+ NAPI_GRO_CB(p)->flush |= flush;
+
+ /* We need to store of the IP ID check to be included later
+ * when we can verify that this packet does in fact belong
+ * to a given flow.
+ */
+ flush_id = (u16)(id - ntohs(iph2->id));
+
+ /* This bit of code makes it much easier for us to identify
+ * the cases where we are doing atomic vs non-atomic IP ID
+ * checks. Specifically an atomic check can return IP ID
+ * values 0 - 0xFFFF, while a non-atomic check can only
+ * return 0 or 0xFFFF.
+ */
+ if (!NAPI_GRO_CB(p)->is_atomic ||
+ !(iph->frag_off & htons(IP_DF))) {
+ flush_id ^= NAPI_GRO_CB(p)->count;
+ flush_id = flush_id ? 0xFFFF : 0;
+ }
+
+ /* If the previous IP ID value was based on an atomic
+ * datagram we can overwrite the value and ignore it.
+ */
+ if (NAPI_GRO_CB(skb)->is_atomic)
+ NAPI_GRO_CB(p)->flush_id = flush_id;
+ else
+ NAPI_GRO_CB(p)->flush_id |= flush_id;
+ }
+
+ NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
+ NAPI_GRO_CB(skb)->flush |= flush;
+ skb_set_network_header(skb, off);
+ /* The above will be needed by the transport layer if there is one
+ * immediately following this IP hdr.
+ */
+
+ /* Note : No need to call skb_gro_postpull_rcsum() here,
+ * as we already checked checksum over ipv4 header was 0
+ */
+ skb_gro_pull(skb, sizeof(*iph));
+ skb_set_transport_header(skb, skb_gro_offset(skb));
+
+ pp = call_gro_receive(ops->callbacks.gro_receive, head, skb);
+
+out_unlock:
+ rcu_read_unlock();
+
+out:
+ skb_gro_flush_final(skb, pp, flush);
+
+ return pp;
+}
+EXPORT_SYMBOL(inet_gro_receive);
+
+static struct sk_buff **ipip_gro_receive(struct sk_buff **head,
+ struct sk_buff *skb)
+{
+ if (NAPI_GRO_CB(skb)->encap_mark) {
+ NAPI_GRO_CB(skb)->flush = 1;
+ return NULL;
+ }
+
+ NAPI_GRO_CB(skb)->encap_mark = 1;
+
+ return inet_gro_receive(head, skb);
+}
+
+#define SECONDS_PER_DAY 86400
+
+/* inet_current_timestamp - Return IP network timestamp
+ *
+ * Return milliseconds since midnight in network byte order.
+ */
+__be32 inet_current_timestamp(void)
+{
+ u32 secs;
+ u32 msecs;
+ struct timespec64 ts;
+
+ ktime_get_real_ts64(&ts);
+
+ /* Get secs since midnight. */
+ (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
+ /* Convert to msecs. */
+ msecs = secs * MSEC_PER_SEC;
+ /* Convert nsec to msec. */
+ msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
+
+ /* Convert to network byte order. */
+ return htonl(msecs);
+}
+EXPORT_SYMBOL(inet_current_timestamp);
+
+int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
+{
+ if (sk->sk_family == AF_INET)
+ return ip_recv_error(sk, msg, len, addr_len);
+#if IS_ENABLED(CONFIG_IPV6)
+ if (sk->sk_family == AF_INET6)
+ return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
+#endif
+ return -EINVAL;
+}
+
+int inet_gro_complete(struct sk_buff *skb, int nhoff)
+{
+ __be16 newlen = htons(skb->len - nhoff);
+ struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
+ const struct net_offload *ops;
+ int proto = iph->protocol;
+ int err = -ENOSYS;
+
+ if (skb->encapsulation) {
+ skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
+ skb_set_inner_network_header(skb, nhoff);
+ }
+
+ csum_replace2(&iph->check, iph->tot_len, newlen);
+ iph->tot_len = newlen;
+
+ rcu_read_lock();
+ ops = rcu_dereference(inet_offloads[proto]);
+ if (WARN_ON(!ops || !ops->callbacks.gro_complete))
+ goto out_unlock;
+
+ /* Only need to add sizeof(*iph) to get to the next hdr below
+ * because any hdr with option will have been flushed in
+ * inet_gro_receive().
+ */
+ err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph));
+
+out_unlock:
+ rcu_read_unlock();
+
+ return err;
+}
+EXPORT_SYMBOL(inet_gro_complete);
+
+static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
+{
+ skb->encapsulation = 1;
+ skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
+ return inet_gro_complete(skb, nhoff);
+}
+
+int inet_ctl_sock_create(struct sock **sk, unsigned short family,
+ unsigned short type, unsigned char protocol,
+ struct net *net)
+{
+ struct socket *sock;
+ int rc = sock_create_kern(net, family, type, protocol, &sock);
+
+ if (rc == 0) {
+ *sk = sock->sk;
+ (*sk)->sk_allocation = GFP_ATOMIC;
+ /*
+ * Unhash it so that IP input processing does not even see it,
+ * we do not wish this socket to see incoming packets.
+ */
+ (*sk)->sk_prot->unhash(*sk);
+ }
+ return rc;
+}
+EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
+
+u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
+{
+ return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
+}
+EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
+
+unsigned long snmp_fold_field(void __percpu *mib, int offt)
+{
+ unsigned long res = 0;
+ int i;
+
+ for_each_possible_cpu(i)
+ res += snmp_get_cpu_field(mib, i, offt);
+ return res;
+}
+EXPORT_SYMBOL_GPL(snmp_fold_field);
+
+#if BITS_PER_LONG==32
+
+u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
+ size_t syncp_offset)
+{
+ void *bhptr;
+ struct u64_stats_sync *syncp;
+ u64 v;
+ unsigned int start;
+
+ bhptr = per_cpu_ptr(mib, cpu);
+ syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
+ do {
+ start = u64_stats_fetch_begin_irq(syncp);
+ v = *(((u64 *)bhptr) + offt);
+ } while (u64_stats_fetch_retry_irq(syncp, start));
+
+ return v;
+}
+EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
+
+u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
+{
+ u64 res = 0;
+ int cpu;
+
+ for_each_possible_cpu(cpu) {
+ res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
+ }
+ return res;
+}
+EXPORT_SYMBOL_GPL(snmp_fold_field64);
+#endif
+
+#ifdef CONFIG_IP_MULTICAST
+static const struct net_protocol igmp_protocol = {
+ .handler = igmp_rcv,
+ .netns_ok = 1,
+};
+#endif
+
+/* thinking of making this const? Don't.
+ * early_demux can change based on sysctl.
+ */
+static struct net_protocol tcp_protocol = {
+ .early_demux = tcp_v4_early_demux,
+ .early_demux_handler = tcp_v4_early_demux,
+ .handler = tcp_v4_rcv,
+ .err_handler = tcp_v4_err,
+ .no_policy = 1,
+ .netns_ok = 1,
+ .icmp_strict_tag_validation = 1,
+};
+
+/* thinking of making this const? Don't.
+ * early_demux can change based on sysctl.
+ */
+static struct net_protocol udp_protocol = {
+ .early_demux = udp_v4_early_demux,
+ .early_demux_handler = udp_v4_early_demux,
+ .handler = udp_rcv,
+ .err_handler = udp_err,
+ .no_policy = 1,
+ .netns_ok = 1,
+};
+
+static const struct net_protocol icmp_protocol = {
+ .handler = icmp_rcv,
+ .err_handler = icmp_err,
+ .no_policy = 1,
+ .netns_ok = 1,
+};
+
+static __net_init int ipv4_mib_init_net(struct net *net)
+{
+ int i;
+
+ net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
+ if (!net->mib.tcp_statistics)
+ goto err_tcp_mib;
+ net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
+ if (!net->mib.ip_statistics)
+ goto err_ip_mib;
+
+ for_each_possible_cpu(i) {
+ struct ipstats_mib *af_inet_stats;
+ af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
+ u64_stats_init(&af_inet_stats->syncp);
+ }
+
+ net->mib.net_statistics = alloc_percpu(struct linux_mib);
+ if (!net->mib.net_statistics)
+ goto err_net_mib;
+ net->mib.udp_statistics = alloc_percpu(struct udp_mib);
+ if (!net->mib.udp_statistics)
+ goto err_udp_mib;
+ net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
+ if (!net->mib.udplite_statistics)
+ goto err_udplite_mib;
+ net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
+ if (!net->mib.icmp_statistics)
+ goto err_icmp_mib;
+ net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
+ GFP_KERNEL);
+ if (!net->mib.icmpmsg_statistics)
+ goto err_icmpmsg_mib;
+
+ tcp_mib_init(net);
+ return 0;
+
+err_icmpmsg_mib:
+ free_percpu(net->mib.icmp_statistics);
+err_icmp_mib:
+ free_percpu(net->mib.udplite_statistics);
+err_udplite_mib:
+ free_percpu(net->mib.udp_statistics);
+err_udp_mib:
+ free_percpu(net->mib.net_statistics);
+err_net_mib:
+ free_percpu(net->mib.ip_statistics);
+err_ip_mib:
+ free_percpu(net->mib.tcp_statistics);
+err_tcp_mib:
+ return -ENOMEM;
+}
+
+static __net_exit void ipv4_mib_exit_net(struct net *net)
+{
+ kfree(net->mib.icmpmsg_statistics);
+ free_percpu(net->mib.icmp_statistics);
+ free_percpu(net->mib.udplite_statistics);
+ free_percpu(net->mib.udp_statistics);
+ free_percpu(net->mib.net_statistics);
+ free_percpu(net->mib.ip_statistics);
+ free_percpu(net->mib.tcp_statistics);
+}
+
+static __net_initdata struct pernet_operations ipv4_mib_ops = {
+ .init = ipv4_mib_init_net,
+ .exit = ipv4_mib_exit_net,
+};
+
+static int __init init_ipv4_mibs(void)
+{
+ return register_pernet_subsys(&ipv4_mib_ops);
+}
+
+static __net_init int inet_init_net(struct net *net)
+{
+ /*
+ * Set defaults for local port range
+ */
+ seqlock_init(&net->ipv4.ip_local_ports.lock);
+ net->ipv4.ip_local_ports.range[0] = 32768;
+ net->ipv4.ip_local_ports.range[1] = 60999;
+
+ seqlock_init(&net->ipv4.ping_group_range.lock);
+ /*
+ * Sane defaults - nobody may create ping sockets.
+ * Boot scripts should set this to distro-specific group.
+ */
+ net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
+ net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
+
+ /* Default values for sysctl-controlled parameters.
+ * We set them here, in case sysctl is not compiled.
+ */
+ net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
+ net->ipv4.sysctl_ip_dynaddr = 0;
+ net->ipv4.sysctl_ip_early_demux = 1;
+ net->ipv4.sysctl_udp_early_demux = 1;
+ net->ipv4.sysctl_tcp_early_demux = 1;
+#ifdef CONFIG_SYSCTL
+ net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
+#endif
+
+ /* Some igmp sysctl, whose values are always used */
+ net->ipv4.sysctl_igmp_max_memberships = 20;
+ net->ipv4.sysctl_igmp_max_msf = 10;
+ /* IGMP reports for link-local multicast groups are enabled by default */
+ net->ipv4.sysctl_igmp_llm_reports = 1;
+ net->ipv4.sysctl_igmp_qrv = 2;
+
+ return 0;
+}
+
+static __net_exit void inet_exit_net(struct net *net)
+{
+}
+
+static __net_initdata struct pernet_operations af_inet_ops = {
+ .init = inet_init_net,
+ .exit = inet_exit_net,
+};
+
+static int __init init_inet_pernet_ops(void)
+{
+ return register_pernet_subsys(&af_inet_ops);
+}
+
+static int ipv4_proc_init(void);
+
+/*
+ * IP protocol layer initialiser
+ */
+
+static struct packet_offload ip_packet_offload __read_mostly = {
+ .type = cpu_to_be16(ETH_P_IP),
+ .callbacks = {
+ .gso_segment = inet_gso_segment,
+ .gro_receive = inet_gro_receive,
+ .gro_complete = inet_gro_complete,
+ },
+};
+
+static const struct net_offload ipip_offload = {
+ .callbacks = {
+ .gso_segment = inet_gso_segment,
+ .gro_receive = ipip_gro_receive,
+ .gro_complete = ipip_gro_complete,
+ },
+};
+
+static int __init ipip_offload_init(void)
+{
+ return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
+}
+
+static int __init ipv4_offload_init(void)
+{
+ /*
+ * Add offloads
+ */
+ if (udpv4_offload_init() < 0)
+ pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
+ if (tcpv4_offload_init() < 0)
+ pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
+ if (ipip_offload_init() < 0)
+ pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
+
+ dev_add_offload(&ip_packet_offload);
+ return 0;
+}
+
+fs_initcall(ipv4_offload_init);
+
+static struct packet_type ip_packet_type __read_mostly = {
+ .type = cpu_to_be16(ETH_P_IP),
+ .func = ip_rcv,
+};
+
+static int __init inet_init(void)
+{
+ struct inet_protosw *q;
+ struct list_head *r;
+ int rc = -EINVAL;
+
+ sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
+
+ rc = proto_register(&tcp_prot, 1);
+ if (rc)
+ goto out;
+
+ rc = proto_register(&udp_prot, 1);
+ if (rc)
+ goto out_unregister_tcp_proto;
+
+ rc = proto_register(&raw_prot, 1);
+ if (rc)
+ goto out_unregister_udp_proto;
+
+ rc = proto_register(&ping_prot, 1);
+ if (rc)
+ goto out_unregister_raw_proto;
+
+ /*
+ * Tell SOCKET that we are alive...
+ */
+
+ (void)sock_register(&inet_family_ops);
+
+#ifdef CONFIG_SYSCTL
+ ip_static_sysctl_init();
+#endif
+
+ /*
+ * Add all the base protocols.
+ */
+
+ if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
+ pr_crit("%s: Cannot add ICMP protocol\n", __func__);
+ if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
+ pr_crit("%s: Cannot add UDP protocol\n", __func__);
+ if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
+ pr_crit("%s: Cannot add TCP protocol\n", __func__);
+#ifdef CONFIG_IP_MULTICAST
+ if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
+ pr_crit("%s: Cannot add IGMP protocol\n", __func__);
+#endif
+
+ /* Register the socket-side information for inet_create. */
+ for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
+ INIT_LIST_HEAD(r);
+
+ for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
+ inet_register_protosw(q);
+
+ /*
+ * Set the ARP module up
+ */
+
+ arp_init();
+
+ /*
+ * Set the IP module up
+ */
+
+ ip_init();
+
+ /* Setup TCP slab cache for open requests. */
+ tcp_init();
+
+ /* Setup UDP memory threshold */
+ udp_init();
+
+ /* Add UDP-Lite (RFC 3828) */
+ udplite4_register();
+
+ ping_init();
+
+ /*
+ * Set the ICMP layer up
+ */
+
+ if (icmp_init() < 0)
+ panic("Failed to create the ICMP control socket.\n");
+
+ /*
+ * Initialise the multicast router
+ */
+#if defined(CONFIG_IP_MROUTE)
+ if (ip_mr_init())
+ pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
+#endif
+
+ if (init_inet_pernet_ops())
+ pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
+ /*
+ * Initialise per-cpu ipv4 mibs
+ */
+
+ if (init_ipv4_mibs())
+ pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
+
+ ipv4_proc_init();
+
+ ipfrag_init();
+
+ dev_add_pack(&ip_packet_type);
+
+ ip_tunnel_core_init();
+
+ rc = 0;
+out:
+ return rc;
+out_unregister_raw_proto:
+ proto_unregister(&raw_prot);
+out_unregister_udp_proto:
+ proto_unregister(&udp_prot);
+out_unregister_tcp_proto:
+ proto_unregister(&tcp_prot);
+ goto out;
+}
+
+fs_initcall(inet_init);
+
+/* ------------------------------------------------------------------------ */
+
+#ifdef CONFIG_PROC_FS
+static int __init ipv4_proc_init(void)
+{
+ int rc = 0;
+
+ if (raw_proc_init())
+ goto out_raw;
+ if (tcp4_proc_init())
+ goto out_tcp;
+ if (udp4_proc_init())
+ goto out_udp;
+ if (ping_proc_init())
+ goto out_ping;
+ if (ip_misc_proc_init())
+ goto out_misc;
+out:
+ return rc;
+out_misc:
+ ping_proc_exit();
+out_ping:
+ udp4_proc_exit();
+out_udp:
+ tcp4_proc_exit();
+out_tcp:
+ raw_proc_exit();
+out_raw:
+ rc = -ENOMEM;
+ goto out;
+}
+
+#else /* CONFIG_PROC_FS */
+static int __init ipv4_proc_init(void)
+{
+ return 0;
+}
+#endif /* CONFIG_PROC_FS */