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678f6e28b5
linux/net/core/sock.c
Mina Almasry 678f6e28b5 net: add SO_DEVMEM_DONTNEED setsockopt to release RX frags 
Add an interface for the user to notify the kernel that it is done
reading the devmem dmabuf frags returned as cmsg. The kernel will
drop the reference on the frags to make them available for reuse.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Kaiyuan Zhang <kaiyuanz@google.com>
Signed-off-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20240910171458.219195-11-almasrymina@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-09-11 20:44:32 -07:00

4379 lines
107 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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.
*
* Generic socket support routines. Memory allocators, socket lock/release
* handler for protocols to use and generic option 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>
*
* Fixes:
* Alan Cox : Numerous verify_area() problems
* Alan Cox : Connecting on a connecting socket
* now returns an error for tcp.
* Alan Cox : sock->protocol is set correctly.
* and is not sometimes left as 0.
* Alan Cox : connect handles icmp errors on a
* connect properly. Unfortunately there
* is a restart syscall nasty there. I
* can't match BSD without hacking the C
* library. Ideas urgently sought!
* Alan Cox : Disallow bind() to addresses that are
* not ours - especially broadcast ones!!
* Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
* Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
* instead they leave that for the DESTROY timer.
* Alan Cox : Clean up error flag in accept
* Alan Cox : TCP ack handling is buggy, the DESTROY timer
* was buggy. Put a remove_sock() in the handler
* for memory when we hit 0. Also altered the timer
* code. The ACK stuff can wait and needs major
* TCP layer surgery.
* Alan Cox : Fixed TCP ack bug, removed remove sock
* and fixed timer/inet_bh race.
* Alan Cox : Added zapped flag for TCP
* Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
* Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
* Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
* Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
* Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
* Rick Sladkey : Relaxed UDP rules for matching packets.
* C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
* Pauline Middelink : identd support
* Alan Cox : Fixed connect() taking signals I think.
* Alan Cox : SO_LINGER supported
* Alan Cox : Error reporting fixes
* Anonymous : inet_create tidied up (sk->reuse setting)
* Alan Cox : inet sockets don't set sk->type!
* Alan Cox : Split socket option code
* Alan Cox : Callbacks
* Alan Cox : Nagle flag for Charles & Johannes stuff
* Alex : Removed restriction on inet fioctl
* Alan Cox : Splitting INET from NET core
* Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
* Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
* Alan Cox : Split IP from generic code
* Alan Cox : New kfree_skbmem()
* Alan Cox : Make SO_DEBUG superuser only.
* Alan Cox : Allow anyone to clear SO_DEBUG
* (compatibility fix)
* Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
* Alan Cox : Allocator for a socket is settable.
* Alan Cox : SO_ERROR includes soft errors.
* Alan Cox : Allow NULL arguments on some SO_ opts
* Alan Cox : Generic socket allocation to make hooks
* easier (suggested by Craig Metz).
* Michael Pall : SO_ERROR returns positive errno again
* Steve Whitehouse: Added default destructor to free
* protocol private data.
* Steve Whitehouse: Added various other default routines
* common to several socket families.
* Chris Evans : Call suser() check last on F_SETOWN
* Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
* Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
* Andi Kleen : Fix write_space callback
* Chris Evans : Security fixes - signedness again
* Arnaldo C. Melo : cleanups, use skb_queue_purge
*
* To Fix:
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <asm/unaligned.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/errqueue.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/sched.h>
#include <linux/sched/mm.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/poll.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/init.h>
#include <linux/highmem.h>
#include <linux/user_namespace.h>
#include <linux/static_key.h>
#include <linux/memcontrol.h>
#include <linux/prefetch.h>
#include <linux/compat.h>
#include <linux/mroute.h>
#include <linux/mroute6.h>
#include <linux/icmpv6.h>
#include <linux/uaccess.h>
#include <linux/netdevice.h>
#include <net/protocol.h>
#include <linux/skbuff.h>
#include <linux/skbuff_ref.h>
#include <net/net_namespace.h>
#include <net/request_sock.h>
#include <net/sock.h>
#include <net/proto_memory.h>
#include <linux/net_tstamp.h>
#include <net/xfrm.h>
#include <linux/ipsec.h>
#include <net/cls_cgroup.h>
#include <net/netprio_cgroup.h>
#include <linux/sock_diag.h>
#include <linux/filter.h>
#include <net/sock_reuseport.h>
#include <net/bpf_sk_storage.h>
#include <trace/events/sock.h>
#include <net/tcp.h>
#include <net/busy_poll.h>
#include <net/phonet/phonet.h>
#include <linux/ethtool.h>
#include "dev.h"
static DEFINE_MUTEX(proto_list_mutex);
static LIST_HEAD(proto_list);
static void sock_def_write_space_wfree(struct sock *sk);
static void sock_def_write_space(struct sock *sk);
/**
* sk_ns_capable - General socket capability test
* @sk: Socket to use a capability on or through
* @user_ns: The user namespace of the capability to use
* @cap: The capability to use
*
* Test to see if the opener of the socket had when the socket was
* created and the current process has the capability @cap in the user
* namespace @user_ns.
*/
bool sk_ns_capable(const struct sock *sk,
struct user_namespace *user_ns, int cap)
{
return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
ns_capable(user_ns, cap);
}
EXPORT_SYMBOL(sk_ns_capable);
/**
* sk_capable - Socket global capability test
* @sk: Socket to use a capability on or through
* @cap: The global capability to use
*
* Test to see if the opener of the socket had when the socket was
* created and the current process has the capability @cap in all user
* namespaces.
*/
bool sk_capable(const struct sock *sk, int cap)
{
return sk_ns_capable(sk, &init_user_ns, cap);
}
EXPORT_SYMBOL(sk_capable);
/**
* sk_net_capable - Network namespace socket capability test
* @sk: Socket to use a capability on or through
* @cap: The capability to use
*
* Test to see if the opener of the socket had when the socket was created
* and the current process has the capability @cap over the network namespace
* the socket is a member of.
*/
bool sk_net_capable(const struct sock *sk, int cap)
{
return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
}
EXPORT_SYMBOL(sk_net_capable);
/*
* Each address family might have different locking rules, so we have
* one slock key per address family and separate keys for internal and
* userspace sockets.
*/
static struct lock_class_key af_family_keys[AF_MAX];
static struct lock_class_key af_family_kern_keys[AF_MAX];
static struct lock_class_key af_family_slock_keys[AF_MAX];
static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
/*
* Make lock validator output more readable. (we pre-construct these
* strings build-time, so that runtime initialization of socket
* locks is fast):
*/
#define _sock_locks(x) \
x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
x "27" , x "28" , x "AF_CAN" , \
x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \
x "AF_MCTP" , \
x "AF_MAX"
static const char *const af_family_key_strings[AF_MAX+1] = {
_sock_locks("sk_lock-")
};
static const char *const af_family_slock_key_strings[AF_MAX+1] = {
_sock_locks("slock-")
};
static const char *const af_family_clock_key_strings[AF_MAX+1] = {
_sock_locks("clock-")
};
static const char *const af_family_kern_key_strings[AF_MAX+1] = {
_sock_locks("k-sk_lock-")
};
static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
_sock_locks("k-slock-")
};
static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
_sock_locks("k-clock-")
};
static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
_sock_locks("rlock-")
};
static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
_sock_locks("wlock-")
};
static const char *const af_family_elock_key_strings[AF_MAX+1] = {
_sock_locks("elock-")
};
/*
* sk_callback_lock and sk queues locking rules are per-address-family,
* so split the lock classes by using a per-AF key:
*/
static struct lock_class_key af_callback_keys[AF_MAX];
static struct lock_class_key af_rlock_keys[AF_MAX];
static struct lock_class_key af_wlock_keys[AF_MAX];
static struct lock_class_key af_elock_keys[AF_MAX];
static struct lock_class_key af_kern_callback_keys[AF_MAX];
/* Run time adjustable parameters. */
__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
EXPORT_SYMBOL(sysctl_wmem_max);
__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
EXPORT_SYMBOL(sysctl_rmem_max);
__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
int sysctl_tstamp_allow_data __read_mostly = 1;
DEFINE_STATIC_KEY_FALSE(memalloc_socks_key);
EXPORT_SYMBOL_GPL(memalloc_socks_key);
/**
* sk_set_memalloc - sets %SOCK_MEMALLOC
* @sk: socket to set it on
*
* Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
* It's the responsibility of the admin to adjust min_free_kbytes
* to meet the requirements
*/
void sk_set_memalloc(struct sock *sk)
{
sock_set_flag(sk, SOCK_MEMALLOC);
sk->sk_allocation |= __GFP_MEMALLOC;
static_branch_inc(&memalloc_socks_key);
}
EXPORT_SYMBOL_GPL(sk_set_memalloc);
void sk_clear_memalloc(struct sock *sk)
{
sock_reset_flag(sk, SOCK_MEMALLOC);
sk->sk_allocation &= ~__GFP_MEMALLOC;
static_branch_dec(&memalloc_socks_key);
/*
* SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
* progress of swapping. SOCK_MEMALLOC may be cleared while
* it has rmem allocations due to the last swapfile being deactivated
* but there is a risk that the socket is unusable due to exceeding
* the rmem limits. Reclaim the reserves and obey rmem limits again.
*/
sk_mem_reclaim(sk);
}
EXPORT_SYMBOL_GPL(sk_clear_memalloc);
int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
{
int ret;
unsigned int noreclaim_flag;
/* these should have been dropped before queueing */
BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
noreclaim_flag = memalloc_noreclaim_save();
ret = INDIRECT_CALL_INET(sk->sk_backlog_rcv,
tcp_v6_do_rcv,
tcp_v4_do_rcv,
sk, skb);
memalloc_noreclaim_restore(noreclaim_flag);
return ret;
}
EXPORT_SYMBOL(__sk_backlog_rcv);
void sk_error_report(struct sock *sk)
{
sk->sk_error_report(sk);
switch (sk->sk_family) {
case AF_INET:
fallthrough;
case AF_INET6:
trace_inet_sk_error_report(sk);
break;
default:
break;
}
}
EXPORT_SYMBOL(sk_error_report);
int sock_get_timeout(long timeo, void *optval, bool old_timeval)
{
struct __kernel_sock_timeval tv;
if (timeo == MAX_SCHEDULE_TIMEOUT) {
tv.tv_sec = 0;
tv.tv_usec = 0;
} else {
tv.tv_sec = timeo / HZ;
tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ;
}
if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec };
*(struct old_timeval32 *)optval = tv32;
return sizeof(tv32);
}
if (old_timeval) {
struct __kernel_old_timeval old_tv;
old_tv.tv_sec = tv.tv_sec;
old_tv.tv_usec = tv.tv_usec;
*(struct __kernel_old_timeval *)optval = old_tv;
return sizeof(old_tv);
}
*(struct __kernel_sock_timeval *)optval = tv;
return sizeof(tv);
}
EXPORT_SYMBOL(sock_get_timeout);
int sock_copy_user_timeval(struct __kernel_sock_timeval *tv,
sockptr_t optval, int optlen, bool old_timeval)
{
if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
struct old_timeval32 tv32;
if (optlen < sizeof(tv32))
return -EINVAL;
if (copy_from_sockptr(&tv32, optval, sizeof(tv32)))
return -EFAULT;
tv->tv_sec = tv32.tv_sec;
tv->tv_usec = tv32.tv_usec;
} else if (old_timeval) {
struct __kernel_old_timeval old_tv;
if (optlen < sizeof(old_tv))
return -EINVAL;
if (copy_from_sockptr(&old_tv, optval, sizeof(old_tv)))
return -EFAULT;
tv->tv_sec = old_tv.tv_sec;
tv->tv_usec = old_tv.tv_usec;
} else {
if (optlen < sizeof(*tv))
return -EINVAL;
if (copy_from_sockptr(tv, optval, sizeof(*tv)))
return -EFAULT;
}
return 0;
}
EXPORT_SYMBOL(sock_copy_user_timeval);
static int sock_set_timeout(long *timeo_p, sockptr_t optval, int optlen,
bool old_timeval)
{
struct __kernel_sock_timeval tv;
int err = sock_copy_user_timeval(&tv, optval, optlen, old_timeval);
long val;
if (err)
return err;
if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
return -EDOM;
if (tv.tv_sec < 0) {
static int warned __read_mostly;
WRITE_ONCE(*timeo_p, 0);
if (warned < 10 && net_ratelimit()) {
warned++;
pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
__func__, current->comm, task_pid_nr(current));
}
return 0;
}
val = MAX_SCHEDULE_TIMEOUT;
if ((tv.tv_sec || tv.tv_usec) &&
(tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)))
val = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec,
USEC_PER_SEC / HZ);
WRITE_ONCE(*timeo_p, val);
return 0;
}
static bool sock_needs_netstamp(const struct sock *sk)
{
switch (sk->sk_family) {
case AF_UNSPEC:
case AF_UNIX:
return false;
default:
return true;
}
}
static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
{
if (sk->sk_flags & flags) {
sk->sk_flags &= ~flags;
if (sock_needs_netstamp(sk) &&
!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
net_disable_timestamp();
}
}
int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
unsigned long flags;
struct sk_buff_head *list = &sk->sk_receive_queue;
if (atomic_read(&sk->sk_rmem_alloc) >= READ_ONCE(sk->sk_rcvbuf)) {
atomic_inc(&sk->sk_drops);
trace_sock_rcvqueue_full(sk, skb);
return -ENOMEM;
}
if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
atomic_inc(&sk->sk_drops);
return -ENOBUFS;
}
skb->dev = NULL;
skb_set_owner_r(skb, sk);
/* we escape from rcu protected region, make sure we dont leak
* a norefcounted dst
*/
skb_dst_force(skb);
spin_lock_irqsave(&list->lock, flags);
sock_skb_set_dropcount(sk, skb);
__skb_queue_tail(list, skb);
spin_unlock_irqrestore(&list->lock, flags);
if (!sock_flag(sk, SOCK_DEAD))
sk->sk_data_ready(sk);
return 0;
}
EXPORT_SYMBOL(__sock_queue_rcv_skb);
int sock_queue_rcv_skb_reason(struct sock *sk, struct sk_buff *skb,
enum skb_drop_reason *reason)
{
enum skb_drop_reason drop_reason;
int err;
err = sk_filter(sk, skb);
if (err) {
drop_reason = SKB_DROP_REASON_SOCKET_FILTER;
goto out;
}
err = __sock_queue_rcv_skb(sk, skb);
switch (err) {
case -ENOMEM:
drop_reason = SKB_DROP_REASON_SOCKET_RCVBUFF;
break;
case -ENOBUFS:
drop_reason = SKB_DROP_REASON_PROTO_MEM;
break;
default:
drop_reason = SKB_NOT_DROPPED_YET;
break;
}
out:
if (reason)
*reason = drop_reason;
return err;
}
EXPORT_SYMBOL(sock_queue_rcv_skb_reason);
int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
const int nested, unsigned int trim_cap, bool refcounted)
{
int rc = NET_RX_SUCCESS;
if (sk_filter_trim_cap(sk, skb, trim_cap))
goto discard_and_relse;
skb->dev = NULL;
if (sk_rcvqueues_full(sk, READ_ONCE(sk->sk_rcvbuf))) {
atomic_inc(&sk->sk_drops);
goto discard_and_relse;
}
if (nested)
bh_lock_sock_nested(sk);
else
bh_lock_sock(sk);
if (!sock_owned_by_user(sk)) {
/*
* trylock + unlock semantics:
*/
mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
rc = sk_backlog_rcv(sk, skb);
mutex_release(&sk->sk_lock.dep_map, _RET_IP_);
} else if (sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf))) {
bh_unlock_sock(sk);
atomic_inc(&sk->sk_drops);
goto discard_and_relse;
}
bh_unlock_sock(sk);
out:
if (refcounted)
sock_put(sk);
return rc;
discard_and_relse:
kfree_skb(skb);
goto out;
}
EXPORT_SYMBOL(__sk_receive_skb);
INDIRECT_CALLABLE_DECLARE(struct dst_entry *ip6_dst_check(struct dst_entry *,
u32));
INDIRECT_CALLABLE_DECLARE(struct dst_entry *ipv4_dst_check(struct dst_entry *,
u32));
struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
{
struct dst_entry *dst = __sk_dst_get(sk);
if (dst && dst->obsolete &&
INDIRECT_CALL_INET(dst->ops->check, ip6_dst_check, ipv4_dst_check,
dst, cookie) == NULL) {
sk_tx_queue_clear(sk);
WRITE_ONCE(sk->sk_dst_pending_confirm, 0);
RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
dst_release(dst);
return NULL;
}
return dst;
}
EXPORT_SYMBOL(__sk_dst_check);
struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
{
struct dst_entry *dst = sk_dst_get(sk);
if (dst && dst->obsolete &&
INDIRECT_CALL_INET(dst->ops->check, ip6_dst_check, ipv4_dst_check,
dst, cookie) == NULL) {
sk_dst_reset(sk);
dst_release(dst);
return NULL;
}
return dst;
}
EXPORT_SYMBOL(sk_dst_check);
static int sock_bindtoindex_locked(struct sock *sk, int ifindex)
{
int ret = -ENOPROTOOPT;
#ifdef CONFIG_NETDEVICES
struct net *net = sock_net(sk);
/* Sorry... */
ret = -EPERM;
if (sk->sk_bound_dev_if && !ns_capable(net->user_ns, CAP_NET_RAW))
goto out;
ret = -EINVAL;
if (ifindex < 0)
goto out;
/* Paired with all READ_ONCE() done locklessly. */
WRITE_ONCE(sk->sk_bound_dev_if, ifindex);
if (sk->sk_prot->rehash)
sk->sk_prot->rehash(sk);
sk_dst_reset(sk);
ret = 0;
out:
#endif
return ret;
}
int sock_bindtoindex(struct sock *sk, int ifindex, bool lock_sk)
{
int ret;
if (lock_sk)
lock_sock(sk);
ret = sock_bindtoindex_locked(sk, ifindex);
if (lock_sk)
release_sock(sk);
return ret;
}
EXPORT_SYMBOL(sock_bindtoindex);
static int sock_setbindtodevice(struct sock *sk, sockptr_t optval, int optlen)
{
int ret = -ENOPROTOOPT;
#ifdef CONFIG_NETDEVICES
struct net *net = sock_net(sk);
char devname[IFNAMSIZ];
int index;
ret = -EINVAL;
if (optlen < 0)
goto out;
/* Bind this socket to a particular device like "eth0",
* as specified in the passed interface name. If the
* name is "" or the option length is zero the socket
* is not bound.
*/
if (optlen > IFNAMSIZ - 1)
optlen = IFNAMSIZ - 1;
memset(devname, 0, sizeof(devname));
ret = -EFAULT;
if (copy_from_sockptr(devname, optval, optlen))
goto out;
index = 0;
if (devname[0] != '\0') {
struct net_device *dev;
rcu_read_lock();
dev = dev_get_by_name_rcu(net, devname);
if (dev)
index = dev->ifindex;
rcu_read_unlock();
ret = -ENODEV;
if (!dev)
goto out;
}
sockopt_lock_sock(sk);
ret = sock_bindtoindex_locked(sk, index);
sockopt_release_sock(sk);
out:
#endif
return ret;
}
static int sock_getbindtodevice(struct sock *sk, sockptr_t optval,
sockptr_t optlen, int len)
{
int ret = -ENOPROTOOPT;
#ifdef CONFIG_NETDEVICES
int bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
struct net *net = sock_net(sk);
char devname[IFNAMSIZ];
if (bound_dev_if == 0) {
len = 0;
goto zero;
}
ret = -EINVAL;
if (len < IFNAMSIZ)
goto out;
ret = netdev_get_name(net, devname, bound_dev_if);
if (ret)
goto out;
len = strlen(devname) + 1;
ret = -EFAULT;
if (copy_to_sockptr(optval, devname, len))
goto out;
zero:
ret = -EFAULT;
if (copy_to_sockptr(optlen, &len, sizeof(int)))
goto out;
ret = 0;
out:
#endif
return ret;
}
bool sk_mc_loop(const struct sock *sk)
{
if (dev_recursion_level())
return false;
if (!sk)
return true;
/* IPV6_ADDRFORM can change sk->sk_family under us. */
switch (READ_ONCE(sk->sk_family)) {
case AF_INET:
return inet_test_bit(MC_LOOP, sk);
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
return inet6_test_bit(MC6_LOOP, sk);
#endif
}
WARN_ON_ONCE(1);
return true;
}
EXPORT_SYMBOL(sk_mc_loop);
void sock_set_reuseaddr(struct sock *sk)
{
lock_sock(sk);
sk->sk_reuse = SK_CAN_REUSE;
release_sock(sk);
}
EXPORT_SYMBOL(sock_set_reuseaddr);
void sock_set_reuseport(struct sock *sk)
{
lock_sock(sk);
sk->sk_reuseport = true;
release_sock(sk);
}
EXPORT_SYMBOL(sock_set_reuseport);
void sock_no_linger(struct sock *sk)
{
lock_sock(sk);
WRITE_ONCE(sk->sk_lingertime, 0);
sock_set_flag(sk, SOCK_LINGER);
release_sock(sk);
}
EXPORT_SYMBOL(sock_no_linger);
void sock_set_priority(struct sock *sk, u32 priority)
{
WRITE_ONCE(sk->sk_priority, priority);
}
EXPORT_SYMBOL(sock_set_priority);
void sock_set_sndtimeo(struct sock *sk, s64 secs)
{
lock_sock(sk);
if (secs && secs < MAX_SCHEDULE_TIMEOUT / HZ - 1)
WRITE_ONCE(sk->sk_sndtimeo, secs * HZ);
else
WRITE_ONCE(sk->sk_sndtimeo, MAX_SCHEDULE_TIMEOUT);
release_sock(sk);
}
EXPORT_SYMBOL(sock_set_sndtimeo);
static void __sock_set_timestamps(struct sock *sk, bool val, bool new, bool ns)
{
if (val) {
sock_valbool_flag(sk, SOCK_TSTAMP_NEW, new);
sock_valbool_flag(sk, SOCK_RCVTSTAMPNS, ns);
sock_set_flag(sk, SOCK_RCVTSTAMP);
sock_enable_timestamp(sk, SOCK_TIMESTAMP);
} else {
sock_reset_flag(sk, SOCK_RCVTSTAMP);
sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
}
}
void sock_enable_timestamps(struct sock *sk)
{
lock_sock(sk);
__sock_set_timestamps(sk, true, false, true);
release_sock(sk);
}
EXPORT_SYMBOL(sock_enable_timestamps);
void sock_set_timestamp(struct sock *sk, int optname, bool valbool)
{
switch (optname) {
case SO_TIMESTAMP_OLD:
__sock_set_timestamps(sk, valbool, false, false);
break;
case SO_TIMESTAMP_NEW:
__sock_set_timestamps(sk, valbool, true, false);
break;
case SO_TIMESTAMPNS_OLD:
__sock_set_timestamps(sk, valbool, false, true);
break;
case SO_TIMESTAMPNS_NEW:
__sock_set_timestamps(sk, valbool, true, true);
break;
}
}
static int sock_timestamping_bind_phc(struct sock *sk, int phc_index)
{
struct net *net = sock_net(sk);
struct net_device *dev = NULL;
bool match = false;
int *vclock_index;
int i, num;
if (sk->sk_bound_dev_if)
dev = dev_get_by_index(net, sk->sk_bound_dev_if);
if (!dev) {
pr_err("%s: sock not bind to device\n", __func__);
return -EOPNOTSUPP;
}
num = ethtool_get_phc_vclocks(dev, &vclock_index);
dev_put(dev);
for (i = 0; i < num; i++) {
if (*(vclock_index + i) == phc_index) {
match = true;
break;
}
}
if (num > 0)
kfree(vclock_index);
if (!match)
return -EINVAL;
WRITE_ONCE(sk->sk_bind_phc, phc_index);
return 0;
}
int sock_set_timestamping(struct sock *sk, int optname,
struct so_timestamping timestamping)
{
int val = timestamping.flags;
int ret;
if (val & ~SOF_TIMESTAMPING_MASK)
return -EINVAL;
if (val & SOF_TIMESTAMPING_OPT_ID_TCP &&
!(val & SOF_TIMESTAMPING_OPT_ID))
return -EINVAL;
if (val & SOF_TIMESTAMPING_OPT_ID &&
!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
if (sk_is_tcp(sk)) {
if ((1 << sk->sk_state) &
(TCPF_CLOSE | TCPF_LISTEN))
return -EINVAL;
if (val & SOF_TIMESTAMPING_OPT_ID_TCP)
atomic_set(&sk->sk_tskey, tcp_sk(sk)->write_seq);
else
atomic_set(&sk->sk_tskey, tcp_sk(sk)->snd_una);
} else {
atomic_set(&sk->sk_tskey, 0);
}
}
if (val & SOF_TIMESTAMPING_OPT_STATS &&
!(val & SOF_TIMESTAMPING_OPT_TSONLY))
return -EINVAL;
if (val & SOF_TIMESTAMPING_BIND_PHC) {
ret = sock_timestamping_bind_phc(sk, timestamping.bind_phc);
if (ret)
return ret;
}
WRITE_ONCE(sk->sk_tsflags, val);
sock_valbool_flag(sk, SOCK_TSTAMP_NEW, optname == SO_TIMESTAMPING_NEW);
if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
sock_enable_timestamp(sk,
SOCK_TIMESTAMPING_RX_SOFTWARE);
else
sock_disable_timestamp(sk,
(1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
return 0;
}
void sock_set_keepalive(struct sock *sk)
{
lock_sock(sk);
if (sk->sk_prot->keepalive)
sk->sk_prot->keepalive(sk, true);
sock_valbool_flag(sk, SOCK_KEEPOPEN, true);
release_sock(sk);
}
EXPORT_SYMBOL(sock_set_keepalive);
static void __sock_set_rcvbuf(struct sock *sk, int val)
{
/* Ensure val * 2 fits into an int, to prevent max_t() from treating it
* as a negative value.
*/
val = min_t(int, val, INT_MAX / 2);
sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
/* We double it on the way in to account for "struct sk_buff" etc.
* overhead. Applications assume that the SO_RCVBUF setting they make
* will allow that much actual data to be received on that socket.
*
* Applications are unaware that "struct sk_buff" and other overheads
* allocate from the receive buffer during socket buffer allocation.
*
* And after considering the possible alternatives, returning the value
* we actually used in getsockopt is the most desirable behavior.
*/
WRITE_ONCE(sk->sk_rcvbuf, max_t(int, val * 2, SOCK_MIN_RCVBUF));
}
void sock_set_rcvbuf(struct sock *sk, int val)
{
lock_sock(sk);
__sock_set_rcvbuf(sk, val);
release_sock(sk);
}
EXPORT_SYMBOL(sock_set_rcvbuf);
static void __sock_set_mark(struct sock *sk, u32 val)
{
if (val != sk->sk_mark) {
WRITE_ONCE(sk->sk_mark, val);
sk_dst_reset(sk);
}
}
void sock_set_mark(struct sock *sk, u32 val)
{
lock_sock(sk);
__sock_set_mark(sk, val);
release_sock(sk);
}
EXPORT_SYMBOL(sock_set_mark);
static void sock_release_reserved_memory(struct sock *sk, int bytes)
{
/* Round down bytes to multiple of pages */
bytes = round_down(bytes, PAGE_SIZE);
WARN_ON(bytes > sk->sk_reserved_mem);
WRITE_ONCE(sk->sk_reserved_mem, sk->sk_reserved_mem - bytes);
sk_mem_reclaim(sk);
}
static int sock_reserve_memory(struct sock *sk, int bytes)
{
long allocated;
bool charged;
int pages;
if (!mem_cgroup_sockets_enabled || !sk->sk_memcg || !sk_has_account(sk))
return -EOPNOTSUPP;
if (!bytes)
return 0;
pages = sk_mem_pages(bytes);
/* pre-charge to memcg */
charged = mem_cgroup_charge_skmem(sk->sk_memcg, pages,
GFP_KERNEL | __GFP_RETRY_MAYFAIL);
if (!charged)
return -ENOMEM;
/* pre-charge to forward_alloc */
sk_memory_allocated_add(sk, pages);
allocated = sk_memory_allocated(sk);
/* If the system goes into memory pressure with this
* precharge, give up and return error.
*/
if (allocated > sk_prot_mem_limits(sk, 1)) {
sk_memory_allocated_sub(sk, pages);
mem_cgroup_uncharge_skmem(sk->sk_memcg, pages);
return -ENOMEM;
}
sk_forward_alloc_add(sk, pages << PAGE_SHIFT);
WRITE_ONCE(sk->sk_reserved_mem,
sk->sk_reserved_mem + (pages << PAGE_SHIFT));
return 0;
}
#ifdef CONFIG_PAGE_POOL
/* This is the number of tokens that the user can SO_DEVMEM_DONTNEED in
* 1 syscall. The limit exists to limit the amount of memory the kernel
* allocates to copy these tokens.
*/
#define MAX_DONTNEED_TOKENS 128
static noinline_for_stack int
sock_devmem_dontneed(struct sock *sk, sockptr_t optval, unsigned int optlen)
{
unsigned int num_tokens, i, j, k, netmem_num = 0;
struct dmabuf_token *tokens;
netmem_ref netmems[16];
int ret = 0;
if (!sk_is_tcp(sk))
return -EBADF;
if (optlen % sizeof(struct dmabuf_token) ||
optlen > sizeof(*tokens) * MAX_DONTNEED_TOKENS)
return -EINVAL;
tokens = kvmalloc_array(optlen, sizeof(*tokens), GFP_KERNEL);
if (!tokens)
return -ENOMEM;
num_tokens = optlen / sizeof(struct dmabuf_token);
if (copy_from_sockptr(tokens, optval, optlen)) {
kvfree(tokens);
return -EFAULT;
}
xa_lock_bh(&sk->sk_user_frags);
for (i = 0; i < num_tokens; i++) {
for (j = 0; j < tokens[i].token_count; j++) {
netmem_ref netmem = (__force netmem_ref)__xa_erase(
&sk->sk_user_frags, tokens[i].token_start + j);
if (netmem &&
!WARN_ON_ONCE(!netmem_is_net_iov(netmem))) {
netmems[netmem_num++] = netmem;
if (netmem_num == ARRAY_SIZE(netmems)) {
xa_unlock_bh(&sk->sk_user_frags);
for (k = 0; k < netmem_num; k++)
WARN_ON_ONCE(!napi_pp_put_page(netmems[k]));
netmem_num = 0;
xa_lock_bh(&sk->sk_user_frags);
}
ret++;
}
}
}
xa_unlock_bh(&sk->sk_user_frags);
for (k = 0; k < netmem_num; k++)
WARN_ON_ONCE(!napi_pp_put_page(netmems[k]));
kvfree(tokens);
return ret;
}
#endif
void sockopt_lock_sock(struct sock *sk)
{
/* When current->bpf_ctx is set, the setsockopt is called from
* a bpf prog. bpf has ensured the sk lock has been
* acquired before calling setsockopt().
*/
if (has_current_bpf_ctx())
return;
lock_sock(sk);
}
EXPORT_SYMBOL(sockopt_lock_sock);
void sockopt_release_sock(struct sock *sk)
{
if (has_current_bpf_ctx())
return;
release_sock(sk);
}
EXPORT_SYMBOL(sockopt_release_sock);
bool sockopt_ns_capable(struct user_namespace *ns, int cap)
{
return has_current_bpf_ctx() || ns_capable(ns, cap);
}
EXPORT_SYMBOL(sockopt_ns_capable);
bool sockopt_capable(int cap)
{
return has_current_bpf_ctx() || capable(cap);
}
EXPORT_SYMBOL(sockopt_capable);
static int sockopt_validate_clockid(__kernel_clockid_t value)
{
switch (value) {
case CLOCK_REALTIME:
case CLOCK_MONOTONIC:
case CLOCK_TAI:
return 0;
}
return -EINVAL;
}
/*
* This is meant for all protocols to use and covers goings on
* at the socket level. Everything here is generic.
*/
int sk_setsockopt(struct sock *sk, int level, int optname,
sockptr_t optval, unsigned int optlen)
{
struct so_timestamping timestamping;
struct socket *sock = sk->sk_socket;
struct sock_txtime sk_txtime;
int val;
int valbool;
struct linger ling;
int ret = 0;
/*
* Options without arguments
*/
if (optname == SO_BINDTODEVICE)
return sock_setbindtodevice(sk, optval, optlen);
if (optlen < sizeof(int))
return -EINVAL;
if (copy_from_sockptr(&val, optval, sizeof(val)))
return -EFAULT;
valbool = val ? 1 : 0;
/* handle options which do not require locking the socket. */
switch (optname) {
case SO_PRIORITY:
if ((val >= 0 && val <= 6) ||
sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) ||
sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
sock_set_priority(sk, val);
return 0;
}
return -EPERM;
case SO_PASSSEC:
assign_bit(SOCK_PASSSEC, &sock->flags, valbool);
return 0;
case SO_PASSCRED:
assign_bit(SOCK_PASSCRED, &sock->flags, valbool);
return 0;
case SO_PASSPIDFD:
assign_bit(SOCK_PASSPIDFD, &sock->flags, valbool);
return 0;
case SO_TYPE:
case SO_PROTOCOL:
case SO_DOMAIN:
case SO_ERROR:
return -ENOPROTOOPT;
#ifdef CONFIG_NET_RX_BUSY_POLL
case SO_BUSY_POLL:
if (val < 0)
return -EINVAL;
WRITE_ONCE(sk->sk_ll_usec, val);
return 0;
case SO_PREFER_BUSY_POLL:
if (valbool && !sockopt_capable(CAP_NET_ADMIN))
return -EPERM;
WRITE_ONCE(sk->sk_prefer_busy_poll, valbool);
return 0;
case SO_BUSY_POLL_BUDGET:
if (val > READ_ONCE(sk->sk_busy_poll_budget) &&
!sockopt_capable(CAP_NET_ADMIN))
return -EPERM;
if (val < 0 || val > U16_MAX)
return -EINVAL;
WRITE_ONCE(sk->sk_busy_poll_budget, val);
return 0;
#endif
case SO_MAX_PACING_RATE:
{
unsigned long ulval = (val == ~0U) ? ~0UL : (unsigned int)val;
unsigned long pacing_rate;
if (sizeof(ulval) != sizeof(val) &&
optlen >= sizeof(ulval) &&
copy_from_sockptr(&ulval, optval, sizeof(ulval))) {
return -EFAULT;
}
if (ulval != ~0UL)
cmpxchg(&sk->sk_pacing_status,
SK_PACING_NONE,
SK_PACING_NEEDED);
/* Pairs with READ_ONCE() from sk_getsockopt() */
WRITE_ONCE(sk->sk_max_pacing_rate, ulval);
pacing_rate = READ_ONCE(sk->sk_pacing_rate);
if (ulval < pacing_rate)
WRITE_ONCE(sk->sk_pacing_rate, ulval);
return 0;
}
case SO_TXREHASH:
if (val < -1 || val > 1)
return -EINVAL;
if ((u8)val == SOCK_TXREHASH_DEFAULT)
val = READ_ONCE(sock_net(sk)->core.sysctl_txrehash);
/* Paired with READ_ONCE() in tcp_rtx_synack()
* and sk_getsockopt().
*/
WRITE_ONCE(sk->sk_txrehash, (u8)val);
return 0;
case SO_PEEK_OFF:
{
int (*set_peek_off)(struct sock *sk, int val);
set_peek_off = READ_ONCE(sock->ops)->set_peek_off;
if (set_peek_off)
ret = set_peek_off(sk, val);
else
ret = -EOPNOTSUPP;
return ret;
}
#ifdef CONFIG_PAGE_POOL
case SO_DEVMEM_DONTNEED:
return sock_devmem_dontneed(sk, optval, optlen);
#endif
}
sockopt_lock_sock(sk);
switch (optname) {
case SO_DEBUG:
if (val && !sockopt_capable(CAP_NET_ADMIN))
ret = -EACCES;
else
sock_valbool_flag(sk, SOCK_DBG, valbool);
break;
case SO_REUSEADDR:
sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
break;
case SO_REUSEPORT:
sk->sk_reuseport = valbool;
break;
case SO_DONTROUTE:
sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
sk_dst_reset(sk);
break;
case SO_BROADCAST:
sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
break;
case SO_SNDBUF:
/* Don't error on this BSD doesn't and if you think
* about it this is right. Otherwise apps have to
* play 'guess the biggest size' games. RCVBUF/SNDBUF
* are treated in BSD as hints
*/
val = min_t(u32, val, READ_ONCE(sysctl_wmem_max));
set_sndbuf:
/* Ensure val * 2 fits into an int, to prevent max_t()
* from treating it as a negative value.
*/
val = min_t(int, val, INT_MAX / 2);
sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
WRITE_ONCE(sk->sk_sndbuf,
max_t(int, val * 2, SOCK_MIN_SNDBUF));
/* Wake up sending tasks if we upped the value. */
sk->sk_write_space(sk);
break;
case SO_SNDBUFFORCE:
if (!sockopt_capable(CAP_NET_ADMIN)) {
ret = -EPERM;
break;
}
/* No negative values (to prevent underflow, as val will be
* multiplied by 2).
*/
if (val < 0)
val = 0;
goto set_sndbuf;
case SO_RCVBUF:
/* Don't error on this BSD doesn't and if you think
* about it this is right. Otherwise apps have to
* play 'guess the biggest size' games. RCVBUF/SNDBUF
* are treated in BSD as hints
*/
__sock_set_rcvbuf(sk, min_t(u32, val, READ_ONCE(sysctl_rmem_max)));
break;
case SO_RCVBUFFORCE:
if (!sockopt_capable(CAP_NET_ADMIN)) {
ret = -EPERM;
break;
}
/* No negative values (to prevent underflow, as val will be
* multiplied by 2).
*/
__sock_set_rcvbuf(sk, max(val, 0));
break;
case SO_KEEPALIVE:
if (sk->sk_prot->keepalive)
sk->sk_prot->keepalive(sk, valbool);
sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
break;
case SO_OOBINLINE:
sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
break;
case SO_NO_CHECK:
sk->sk_no_check_tx = valbool;
break;
case SO_LINGER:
if (optlen < sizeof(ling)) {
ret = -EINVAL; /* 1003.1g */
break;
}
if (copy_from_sockptr(&ling, optval, sizeof(ling))) {
ret = -EFAULT;
break;
}
if (!ling.l_onoff) {
sock_reset_flag(sk, SOCK_LINGER);
} else {
unsigned long t_sec = ling.l_linger;
if (t_sec >= MAX_SCHEDULE_TIMEOUT / HZ)
WRITE_ONCE(sk->sk_lingertime, MAX_SCHEDULE_TIMEOUT);
else
WRITE_ONCE(sk->sk_lingertime, t_sec * HZ);
sock_set_flag(sk, SOCK_LINGER);
}
break;
case SO_BSDCOMPAT:
break;
case SO_TIMESTAMP_OLD:
case SO_TIMESTAMP_NEW:
case SO_TIMESTAMPNS_OLD:
case SO_TIMESTAMPNS_NEW:
sock_set_timestamp(sk, optname, valbool);
break;
case SO_TIMESTAMPING_NEW:
case SO_TIMESTAMPING_OLD:
if (optlen == sizeof(timestamping)) {
if (copy_from_sockptr(&timestamping, optval,
sizeof(timestamping))) {
ret = -EFAULT;
break;
}
} else {
memset(&timestamping, 0, sizeof(timestamping));
timestamping.flags = val;
}
ret = sock_set_timestamping(sk, optname, timestamping);
break;
case SO_RCVLOWAT:
{
int (*set_rcvlowat)(struct sock *sk, int val) = NULL;
if (val < 0)
val = INT_MAX;
if (sock)
set_rcvlowat = READ_ONCE(sock->ops)->set_rcvlowat;
if (set_rcvlowat)
ret = set_rcvlowat(sk, val);
else
WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
break;
}
case SO_RCVTIMEO_OLD:
case SO_RCVTIMEO_NEW:
ret = sock_set_timeout(&sk->sk_rcvtimeo, optval,
optlen, optname == SO_RCVTIMEO_OLD);
break;
case SO_SNDTIMEO_OLD:
case SO_SNDTIMEO_NEW:
ret = sock_set_timeout(&sk->sk_sndtimeo, optval,
optlen, optname == SO_SNDTIMEO_OLD);
break;
case SO_ATTACH_FILTER: {
struct sock_fprog fprog;
ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
if (!ret)
ret = sk_attach_filter(&fprog, sk);
break;
}
case SO_ATTACH_BPF:
ret = -EINVAL;
if (optlen == sizeof(u32)) {
u32 ufd;
ret = -EFAULT;
if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
break;
ret = sk_attach_bpf(ufd, sk);
}
break;
case SO_ATTACH_REUSEPORT_CBPF: {
struct sock_fprog fprog;
ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
if (!ret)
ret = sk_reuseport_attach_filter(&fprog, sk);
break;
}
case SO_ATTACH_REUSEPORT_EBPF:
ret = -EINVAL;
if (optlen == sizeof(u32)) {
u32 ufd;
ret = -EFAULT;
if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
break;
ret = sk_reuseport_attach_bpf(ufd, sk);
}
break;
case SO_DETACH_REUSEPORT_BPF:
ret = reuseport_detach_prog(sk);
break;
case SO_DETACH_FILTER:
ret = sk_detach_filter(sk);
break;
case SO_LOCK_FILTER:
if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
ret = -EPERM;
else
sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
break;
case SO_MARK:
if (!sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
!sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
ret = -EPERM;
break;
}
__sock_set_mark(sk, val);
break;
case SO_RCVMARK:
sock_valbool_flag(sk, SOCK_RCVMARK, valbool);
break;
case SO_RXQ_OVFL:
sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
break;
case SO_WIFI_STATUS:
sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
break;
case SO_NOFCS:
sock_valbool_flag(sk, SOCK_NOFCS, valbool);
break;
case SO_SELECT_ERR_QUEUE:
sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
break;
case SO_INCOMING_CPU:
reuseport_update_incoming_cpu(sk, val);
break;
case SO_CNX_ADVICE:
if (val == 1)
dst_negative_advice(sk);
break;
case SO_ZEROCOPY:
if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
if (!(sk_is_tcp(sk) ||
(sk->sk_type == SOCK_DGRAM &&
sk->sk_protocol == IPPROTO_UDP)))
ret = -EOPNOTSUPP;
} else if (sk->sk_family != PF_RDS) {
ret = -EOPNOTSUPP;
}
if (!ret) {
if (val < 0 || val > 1)
ret = -EINVAL;
else
sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
}
break;
case SO_TXTIME:
if (optlen != sizeof(struct sock_txtime)) {
ret = -EINVAL;
break;
} else if (copy_from_sockptr(&sk_txtime, optval,
sizeof(struct sock_txtime))) {
ret = -EFAULT;
break;
} else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) {
ret = -EINVAL;
break;
}
/* CLOCK_MONOTONIC is only used by sch_fq, and this packet
* scheduler has enough safe guards.
*/
if (sk_txtime.clockid != CLOCK_MONOTONIC &&
!sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
ret = -EPERM;
break;
}
ret = sockopt_validate_clockid(sk_txtime.clockid);
if (ret)
break;
sock_valbool_flag(sk, SOCK_TXTIME, true);
sk->sk_clockid = sk_txtime.clockid;
sk->sk_txtime_deadline_mode =
!!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
sk->sk_txtime_report_errors =
!!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS);
break;
case SO_BINDTOIFINDEX:
ret = sock_bindtoindex_locked(sk, val);
break;
case SO_BUF_LOCK:
if (val & ~SOCK_BUF_LOCK_MASK) {
ret = -EINVAL;
break;
}
sk->sk_userlocks = val | (sk->sk_userlocks &
~SOCK_BUF_LOCK_MASK);
break;
case SO_RESERVE_MEM:
{
int delta;
if (val < 0) {
ret = -EINVAL;
break;
}
delta = val - sk->sk_reserved_mem;
if (delta < 0)
sock_release_reserved_memory(sk, -delta);
else
ret = sock_reserve_memory(sk, delta);
break;
}
default:
ret = -ENOPROTOOPT;
break;
}
sockopt_release_sock(sk);
return ret;
}
int sock_setsockopt(struct socket *sock, int level, int optname,
sockptr_t optval, unsigned int optlen)
{
return sk_setsockopt(sock->sk, level, optname,
optval, optlen);
}
EXPORT_SYMBOL(sock_setsockopt);
static const struct cred *sk_get_peer_cred(struct sock *sk)
{
const struct cred *cred;
spin_lock(&sk->sk_peer_lock);
cred = get_cred(sk->sk_peer_cred);
spin_unlock(&sk->sk_peer_lock);
return cred;
}
static void cred_to_ucred(struct pid *pid, const struct cred *cred,
struct ucred *ucred)
{
ucred->pid = pid_vnr(pid);
ucred->uid = ucred->gid = -1;
if (cred) {
struct user_namespace *current_ns = current_user_ns();
ucred->uid = from_kuid_munged(current_ns, cred->euid);
ucred->gid = from_kgid_munged(current_ns, cred->egid);
}
}
static int groups_to_user(sockptr_t dst, const struct group_info *src)
{
struct user_namespace *user_ns = current_user_ns();
int i;
for (i = 0; i < src->ngroups; i++) {
gid_t gid = from_kgid_munged(user_ns, src->gid[i]);
if (copy_to_sockptr_offset(dst, i * sizeof(gid), &gid, sizeof(gid)))
return -EFAULT;
}
return 0;
}
int sk_getsockopt(struct sock *sk, int level, int optname,
sockptr_t optval, sockptr_t optlen)
{
struct socket *sock = sk->sk_socket;
union {
int val;
u64 val64;
unsigned long ulval;
struct linger ling;
struct old_timeval32 tm32;
struct __kernel_old_timeval tm;
struct __kernel_sock_timeval stm;
struct sock_txtime txtime;
struct so_timestamping timestamping;
} v;
int lv = sizeof(int);
int len;
if (copy_from_sockptr(&len, optlen, sizeof(int)))
return -EFAULT;
if (len < 0)
return -EINVAL;
memset(&v, 0, sizeof(v));
switch (optname) {
case SO_DEBUG:
v.val = sock_flag(sk, SOCK_DBG);
break;
case SO_DONTROUTE:
v.val = sock_flag(sk, SOCK_LOCALROUTE);
break;
case SO_BROADCAST:
v.val = sock_flag(sk, SOCK_BROADCAST);
break;
case SO_SNDBUF:
v.val = READ_ONCE(sk->sk_sndbuf);
break;
case SO_RCVBUF:
v.val = READ_ONCE(sk->sk_rcvbuf);
break;
case SO_REUSEADDR:
v.val = sk->sk_reuse;
break;
case SO_REUSEPORT:
v.val = sk->sk_reuseport;
break;
case SO_KEEPALIVE:
v.val = sock_flag(sk, SOCK_KEEPOPEN);
break;
case SO_TYPE:
v.val = sk->sk_type;
break;
case SO_PROTOCOL:
v.val = sk->sk_protocol;
break;
case SO_DOMAIN:
v.val = sk->sk_family;
break;
case SO_ERROR:
v.val = -sock_error(sk);
if (v.val == 0)
v.val = xchg(&sk->sk_err_soft, 0);
break;
case SO_OOBINLINE:
v.val = sock_flag(sk, SOCK_URGINLINE);
break;
case SO_NO_CHECK:
v.val = sk->sk_no_check_tx;
break;
case SO_PRIORITY:
v.val = READ_ONCE(sk->sk_priority);
break;
case SO_LINGER:
lv = sizeof(v.ling);
v.ling.l_onoff = sock_flag(sk, SOCK_LINGER);
v.ling.l_linger = READ_ONCE(sk->sk_lingertime) / HZ;
break;
case SO_BSDCOMPAT:
break;
case SO_TIMESTAMP_OLD:
v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
!sock_flag(sk, SOCK_TSTAMP_NEW) &&
!sock_flag(sk, SOCK_RCVTSTAMPNS);
break;
case SO_TIMESTAMPNS_OLD:
v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW);
break;
case SO_TIMESTAMP_NEW:
v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW);
break;
case SO_TIMESTAMPNS_NEW:
v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW);
break;
case SO_TIMESTAMPING_OLD:
case SO_TIMESTAMPING_NEW:
lv = sizeof(v.timestamping);
/* For the later-added case SO_TIMESTAMPING_NEW: Be strict about only
* returning the flags when they were set through the same option.
* Don't change the beviour for the old case SO_TIMESTAMPING_OLD.
*/
if (optname == SO_TIMESTAMPING_OLD || sock_flag(sk, SOCK_TSTAMP_NEW)) {
v.timestamping.flags = READ_ONCE(sk->sk_tsflags);
v.timestamping.bind_phc = READ_ONCE(sk->sk_bind_phc);
}
break;
case SO_RCVTIMEO_OLD:
case SO_RCVTIMEO_NEW:
lv = sock_get_timeout(READ_ONCE(sk->sk_rcvtimeo), &v,
SO_RCVTIMEO_OLD == optname);
break;
case SO_SNDTIMEO_OLD:
case SO_SNDTIMEO_NEW:
lv = sock_get_timeout(READ_ONCE(sk->sk_sndtimeo), &v,
SO_SNDTIMEO_OLD == optname);
break;
case SO_RCVLOWAT:
v.val = READ_ONCE(sk->sk_rcvlowat);
break;
case SO_SNDLOWAT:
v.val = 1;
break;
case SO_PASSCRED:
v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
break;
case SO_PASSPIDFD:
v.val = !!test_bit(SOCK_PASSPIDFD, &sock->flags);
break;
case SO_PEERCRED:
{
struct ucred peercred;
if (len > sizeof(peercred))
len = sizeof(peercred);
spin_lock(&sk->sk_peer_lock);
cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
spin_unlock(&sk->sk_peer_lock);
if (copy_to_sockptr(optval, &peercred, len))
return -EFAULT;
goto lenout;
}
case SO_PEERPIDFD:
{
struct pid *peer_pid;
struct file *pidfd_file = NULL;
int pidfd;
if (len > sizeof(pidfd))
len = sizeof(pidfd);
spin_lock(&sk->sk_peer_lock);
peer_pid = get_pid(sk->sk_peer_pid);
spin_unlock(&sk->sk_peer_lock);
if (!peer_pid)
return -ENODATA;
pidfd = pidfd_prepare(peer_pid, 0, &pidfd_file);
put_pid(peer_pid);
if (pidfd < 0)
return pidfd;
if (copy_to_sockptr(optval, &pidfd, len) ||
copy_to_sockptr(optlen, &len, sizeof(int))) {
put_unused_fd(pidfd);
fput(pidfd_file);
return -EFAULT;
}
fd_install(pidfd, pidfd_file);
return 0;
}
case SO_PEERGROUPS:
{
const struct cred *cred;
int ret, n;
cred = sk_get_peer_cred(sk);
if (!cred)
return -ENODATA;
n = cred->group_info->ngroups;
if (len < n * sizeof(gid_t)) {
len = n * sizeof(gid_t);
put_cred(cred);
return copy_to_sockptr(optlen, &len, sizeof(int)) ? -EFAULT : -ERANGE;
}
len = n * sizeof(gid_t);
ret = groups_to_user(optval, cred->group_info);
put_cred(cred);
if (ret)
return ret;
goto lenout;
}
case SO_PEERNAME:
{
struct sockaddr_storage address;
lv = READ_ONCE(sock->ops)->getname(sock, (struct sockaddr *)&address, 2);
if (lv < 0)
return -ENOTCONN;
if (lv < len)
return -EINVAL;
if (copy_to_sockptr(optval, &address, len))
return -EFAULT;
goto lenout;
}
/* Dubious BSD thing... Probably nobody even uses it, but
* the UNIX standard wants it for whatever reason... -DaveM
*/
case SO_ACCEPTCONN:
v.val = sk->sk_state == TCP_LISTEN;
break;
case SO_PASSSEC:
v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
break;
case SO_PEERSEC:
return security_socket_getpeersec_stream(sock,
optval, optlen, len);
case SO_MARK:
v.val = READ_ONCE(sk->sk_mark);
break;
case SO_RCVMARK:
v.val = sock_flag(sk, SOCK_RCVMARK);
break;
case SO_RXQ_OVFL:
v.val = sock_flag(sk, SOCK_RXQ_OVFL);
break;
case SO_WIFI_STATUS:
v.val = sock_flag(sk, SOCK_WIFI_STATUS);
break;
case SO_PEEK_OFF:
if (!READ_ONCE(sock->ops)->set_peek_off)
return -EOPNOTSUPP;
v.val = READ_ONCE(sk->sk_peek_off);
break;
case SO_NOFCS:
v.val = sock_flag(sk, SOCK_NOFCS);
break;
case SO_BINDTODEVICE:
return sock_getbindtodevice(sk, optval, optlen, len);
case SO_GET_FILTER:
len = sk_get_filter(sk, optval, len);
if (len < 0)
return len;
goto lenout;
case SO_LOCK_FILTER:
v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
break;
case SO_BPF_EXTENSIONS:
v.val = bpf_tell_extensions();
break;
case SO_SELECT_ERR_QUEUE:
v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
break;
#ifdef CONFIG_NET_RX_BUSY_POLL
case SO_BUSY_POLL:
v.val = READ_ONCE(sk->sk_ll_usec);
break;
case SO_PREFER_BUSY_POLL:
v.val = READ_ONCE(sk->sk_prefer_busy_poll);
break;
#endif
case SO_MAX_PACING_RATE:
/* The READ_ONCE() pair with the WRITE_ONCE() in sk_setsockopt() */
if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) {
lv = sizeof(v.ulval);
v.ulval = READ_ONCE(sk->sk_max_pacing_rate);
} else {
/* 32bit version */
v.val = min_t(unsigned long, ~0U,
READ_ONCE(sk->sk_max_pacing_rate));
}
break;
case SO_INCOMING_CPU:
v.val = READ_ONCE(sk->sk_incoming_cpu);
break;
case SO_MEMINFO:
{
u32 meminfo[SK_MEMINFO_VARS];
sk_get_meminfo(sk, meminfo);
len = min_t(unsigned int, len, sizeof(meminfo));
if (copy_to_sockptr(optval, &meminfo, len))
return -EFAULT;
goto lenout;
}
#ifdef CONFIG_NET_RX_BUSY_POLL
case SO_INCOMING_NAPI_ID:
v.val = READ_ONCE(sk->sk_napi_id);
/* aggregate non-NAPI IDs down to 0 */
if (v.val < MIN_NAPI_ID)
v.val = 0;
break;
#endif
case SO_COOKIE:
lv = sizeof(u64);
if (len < lv)
return -EINVAL;
v.val64 = sock_gen_cookie(sk);
break;
case SO_ZEROCOPY:
v.val = sock_flag(sk, SOCK_ZEROCOPY);
break;
case SO_TXTIME:
lv = sizeof(v.txtime);
v.txtime.clockid = sk->sk_clockid;
v.txtime.flags |= sk->sk_txtime_deadline_mode ?
SOF_TXTIME_DEADLINE_MODE : 0;
v.txtime.flags |= sk->sk_txtime_report_errors ?
SOF_TXTIME_REPORT_ERRORS : 0;
break;
case SO_BINDTOIFINDEX:
v.val = READ_ONCE(sk->sk_bound_dev_if);
break;
case SO_NETNS_COOKIE:
lv = sizeof(u64);
if (len != lv)
return -EINVAL;
v.val64 = sock_net(sk)->net_cookie;
break;
case SO_BUF_LOCK:
v.val = sk->sk_userlocks & SOCK_BUF_LOCK_MASK;
break;
case SO_RESERVE_MEM:
v.val = READ_ONCE(sk->sk_reserved_mem);
break;
case SO_TXREHASH:
/* Paired with WRITE_ONCE() in sk_setsockopt() */
v.val = READ_ONCE(sk->sk_txrehash);
break;
default:
/* We implement the SO_SNDLOWAT etc to not be settable
* (1003.1g 7).
*/
return -ENOPROTOOPT;
}
if (len > lv)
len = lv;
if (copy_to_sockptr(optval, &v, len))
return -EFAULT;
lenout:
if (copy_to_sockptr(optlen, &len, sizeof(int)))
return -EFAULT;
return 0;
}
/*
* Initialize an sk_lock.
*
* (We also register the sk_lock with the lock validator.)
*/
static inline void sock_lock_init(struct sock *sk)
{
if (sk->sk_kern_sock)
sock_lock_init_class_and_name(
sk,
af_family_kern_slock_key_strings[sk->sk_family],
af_family_kern_slock_keys + sk->sk_family,
af_family_kern_key_strings[sk->sk_family],
af_family_kern_keys + sk->sk_family);
else
sock_lock_init_class_and_name(
sk,
af_family_slock_key_strings[sk->sk_family],
af_family_slock_keys + sk->sk_family,
af_family_key_strings[sk->sk_family],
af_family_keys + sk->sk_family);
}
/*
* Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
* even temporarily, because of RCU lookups. sk_node should also be left as is.
* We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
*/
static void sock_copy(struct sock *nsk, const struct sock *osk)
{
const struct proto *prot = READ_ONCE(osk->sk_prot);
#ifdef CONFIG_SECURITY_NETWORK
void *sptr = nsk->sk_security;
#endif
/* If we move sk_tx_queue_mapping out of the private section,
* we must check if sk_tx_queue_clear() is called after
* sock_copy() in sk_clone_lock().
*/
BUILD_BUG_ON(offsetof(struct sock, sk_tx_queue_mapping) <
offsetof(struct sock, sk_dontcopy_begin) ||
offsetof(struct sock, sk_tx_queue_mapping) >=
offsetof(struct sock, sk_dontcopy_end));
memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
unsafe_memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
prot->obj_size - offsetof(struct sock, sk_dontcopy_end),
/* alloc is larger than struct, see sk_prot_alloc() */);
#ifdef CONFIG_SECURITY_NETWORK
nsk->sk_security = sptr;
security_sk_clone(osk, nsk);
#endif
}
static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
int family)
{
struct sock *sk;
struct kmem_cache *slab;
slab = prot->slab;
if (slab != NULL) {
sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
if (!sk)
return sk;
if (want_init_on_alloc(priority))
sk_prot_clear_nulls(sk, prot->obj_size);
} else
sk = kmalloc(prot->obj_size, priority);
if (sk != NULL) {
if (security_sk_alloc(sk, family, priority))
goto out_free;
if (!try_module_get(prot->owner))
goto out_free_sec;
}
return sk;
out_free_sec:
security_sk_free(sk);
out_free:
if (slab != NULL)
kmem_cache_free(slab, sk);
else
kfree(sk);
return NULL;
}
static void sk_prot_free(struct proto *prot, struct sock *sk)
{
struct kmem_cache *slab;
struct module *owner;
owner = prot->owner;
slab = prot->slab;
cgroup_sk_free(&sk->sk_cgrp_data);
mem_cgroup_sk_free(sk);
security_sk_free(sk);
if (slab != NULL)
kmem_cache_free(slab, sk);
else
kfree(sk);
module_put(owner);
}
/**
* sk_alloc - All socket objects are allocated here
* @net: the applicable net namespace
* @family: protocol family
* @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
* @prot: struct proto associated with this new sock instance
* @kern: is this to be a kernel socket?
*/
struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
struct proto *prot, int kern)
{
struct sock *sk;
sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
if (sk) {
sk->sk_family = family;
/*
* See comment in struct sock definition to understand
* why we need sk_prot_creator -acme
*/
sk->sk_prot = sk->sk_prot_creator = prot;
sk->sk_kern_sock = kern;
sock_lock_init(sk);
sk->sk_net_refcnt = kern ? 0 : 1;
if (likely(sk->sk_net_refcnt)) {
get_net_track(net, &sk->ns_tracker, priority);
sock_inuse_add(net, 1);
} else {
__netns_tracker_alloc(net, &sk->ns_tracker,
false, priority);
}
sock_net_set(sk, net);
refcount_set(&sk->sk_wmem_alloc, 1);
mem_cgroup_sk_alloc(sk);
cgroup_sk_alloc(&sk->sk_cgrp_data);
sock_update_classid(&sk->sk_cgrp_data);
sock_update_netprioidx(&sk->sk_cgrp_data);
sk_tx_queue_clear(sk);
}
return sk;
}
EXPORT_SYMBOL(sk_alloc);
/* Sockets having SOCK_RCU_FREE will call this function after one RCU
* grace period. This is the case for UDP sockets and TCP listeners.
*/
static void __sk_destruct(struct rcu_head *head)
{
struct sock *sk = container_of(head, struct sock, sk_rcu);
struct sk_filter *filter;
if (sk->sk_destruct)
sk->sk_destruct(sk);
filter = rcu_dereference_check(sk->sk_filter,
refcount_read(&sk->sk_wmem_alloc) == 0);
if (filter) {
sk_filter_uncharge(sk, filter);
RCU_INIT_POINTER(sk->sk_filter, NULL);
}
sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
#ifdef CONFIG_BPF_SYSCALL
bpf_sk_storage_free(sk);
#endif
if (atomic_read(&sk->sk_omem_alloc))
pr_debug("%s: optmem leakage (%d bytes) detected\n",
__func__, atomic_read(&sk->sk_omem_alloc));
if (sk->sk_frag.page) {
put_page(sk->sk_frag.page);
sk->sk_frag.page = NULL;
}
/* We do not need to acquire sk->sk_peer_lock, we are the last user. */
put_cred(sk->sk_peer_cred);
put_pid(sk->sk_peer_pid);
if (likely(sk->sk_net_refcnt))
put_net_track(sock_net(sk), &sk->ns_tracker);
else
__netns_tracker_free(sock_net(sk), &sk->ns_tracker, false);
sk_prot_free(sk->sk_prot_creator, sk);
}
void sk_destruct(struct sock *sk)
{
bool use_call_rcu = sock_flag(sk, SOCK_RCU_FREE);
if (rcu_access_pointer(sk->sk_reuseport_cb)) {
reuseport_detach_sock(sk);
use_call_rcu = true;
}
if (use_call_rcu)
call_rcu(&sk->sk_rcu, __sk_destruct);
else
__sk_destruct(&sk->sk_rcu);
}
static void __sk_free(struct sock *sk)
{
if (likely(sk->sk_net_refcnt))
sock_inuse_add(sock_net(sk), -1);
if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
sock_diag_broadcast_destroy(sk);
else
sk_destruct(sk);
}
void sk_free(struct sock *sk)
{
/*
* We subtract one from sk_wmem_alloc and can know if
* some packets are still in some tx queue.
* If not null, sock_wfree() will call __sk_free(sk) later
*/
if (refcount_dec_and_test(&sk->sk_wmem_alloc))
__sk_free(sk);
}
EXPORT_SYMBOL(sk_free);
static void sk_init_common(struct sock *sk)
{
skb_queue_head_init(&sk->sk_receive_queue);
skb_queue_head_init(&sk->sk_write_queue);
skb_queue_head_init(&sk->sk_error_queue);
rwlock_init(&sk->sk_callback_lock);
lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
af_rlock_keys + sk->sk_family,
af_family_rlock_key_strings[sk->sk_family]);
lockdep_set_class_and_name(&sk->sk_write_queue.lock,
af_wlock_keys + sk->sk_family,
af_family_wlock_key_strings[sk->sk_family]);
lockdep_set_class_and_name(&sk->sk_error_queue.lock,
af_elock_keys + sk->sk_family,
af_family_elock_key_strings[sk->sk_family]);
if (sk->sk_kern_sock)
lockdep_set_class_and_name(&sk->sk_callback_lock,
af_kern_callback_keys + sk->sk_family,
af_family_kern_clock_key_strings[sk->sk_family]);
else
lockdep_set_class_and_name(&sk->sk_callback_lock,
af_callback_keys + sk->sk_family,
af_family_clock_key_strings[sk->sk_family]);
}
/**
* sk_clone_lock - clone a socket, and lock its clone
* @sk: the socket to clone
* @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
*
* Caller must unlock socket even in error path (bh_unlock_sock(newsk))
*/
struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
{
struct proto *prot = READ_ONCE(sk->sk_prot);
struct sk_filter *filter;
bool is_charged = true;
struct sock *newsk;
newsk = sk_prot_alloc(prot, priority, sk->sk_family);
if (!newsk)
goto out;
sock_copy(newsk, sk);
newsk->sk_prot_creator = prot;
/* SANITY */
if (likely(newsk->sk_net_refcnt)) {
get_net_track(sock_net(newsk), &newsk->ns_tracker, priority);
sock_inuse_add(sock_net(newsk), 1);
} else {
/* Kernel sockets are not elevating the struct net refcount.
* Instead, use a tracker to more easily detect if a layer
* is not properly dismantling its kernel sockets at netns
* destroy time.
*/
__netns_tracker_alloc(sock_net(newsk), &newsk->ns_tracker,
false, priority);
}
sk_node_init(&newsk->sk_node);
sock_lock_init(newsk);
bh_lock_sock(newsk);
newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
newsk->sk_backlog.len = 0;
atomic_set(&newsk->sk_rmem_alloc, 0);
/* sk_wmem_alloc set to one (see sk_free() and sock_wfree()) */
refcount_set(&newsk->sk_wmem_alloc, 1);
atomic_set(&newsk->sk_omem_alloc, 0);
sk_init_common(newsk);
newsk->sk_dst_cache = NULL;
newsk->sk_dst_pending_confirm = 0;
newsk->sk_wmem_queued = 0;
newsk->sk_forward_alloc = 0;
newsk->sk_reserved_mem = 0;
atomic_set(&newsk->sk_drops, 0);
newsk->sk_send_head = NULL;
newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
atomic_set(&newsk->sk_zckey, 0);
sock_reset_flag(newsk, SOCK_DONE);
/* sk->sk_memcg will be populated at accept() time */
newsk->sk_memcg = NULL;
cgroup_sk_clone(&newsk->sk_cgrp_data);
rcu_read_lock();
filter = rcu_dereference(sk->sk_filter);
if (filter != NULL)
/* though it's an empty new sock, the charging may fail
* if sysctl_optmem_max was changed between creation of
* original socket and cloning
*/
is_charged = sk_filter_charge(newsk, filter);
RCU_INIT_POINTER(newsk->sk_filter, filter);
rcu_read_unlock();
if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
/* We need to make sure that we don't uncharge the new
* socket if we couldn't charge it in the first place
* as otherwise we uncharge the parent's filter.
*/
if (!is_charged)
RCU_INIT_POINTER(newsk->sk_filter, NULL);
sk_free_unlock_clone(newsk);
newsk = NULL;
goto out;
}
RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
if (bpf_sk_storage_clone(sk, newsk)) {
sk_free_unlock_clone(newsk);
newsk = NULL;
goto out;
}
/* Clear sk_user_data if parent had the pointer tagged
* as not suitable for copying when cloning.
*/
if (sk_user_data_is_nocopy(newsk))
newsk->sk_user_data = NULL;
newsk->sk_err = 0;
newsk->sk_err_soft = 0;
newsk->sk_priority = 0;
newsk->sk_incoming_cpu = raw_smp_processor_id();
/* Before updating sk_refcnt, we must commit prior changes to memory
* (Documentation/RCU/rculist_nulls.rst for details)
*/
smp_wmb();
refcount_set(&newsk->sk_refcnt, 2);
sk_set_socket(newsk, NULL);
sk_tx_queue_clear(newsk);
RCU_INIT_POINTER(newsk->sk_wq, NULL);
if (newsk->sk_prot->sockets_allocated)
sk_sockets_allocated_inc(newsk);
if (sock_needs_netstamp(sk) && newsk->sk_flags & SK_FLAGS_TIMESTAMP)
net_enable_timestamp();
out:
return newsk;
}
EXPORT_SYMBOL_GPL(sk_clone_lock);
void sk_free_unlock_clone(struct sock *sk)
{
/* It is still raw copy of parent, so invalidate
* destructor and make plain sk_free() */
sk->sk_destruct = NULL;
bh_unlock_sock(sk);
sk_free(sk);
}
EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
static u32 sk_dst_gso_max_size(struct sock *sk, struct dst_entry *dst)
{
bool is_ipv6 = false;
u32 max_size;
#if IS_ENABLED(CONFIG_IPV6)
is_ipv6 = (sk->sk_family == AF_INET6 &&
!ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr));
#endif
/* pairs with the WRITE_ONCE() in netif_set_gso(_ipv4)_max_size() */
max_size = is_ipv6 ? READ_ONCE(dst->dev->gso_max_size) :
READ_ONCE(dst->dev->gso_ipv4_max_size);
if (max_size > GSO_LEGACY_MAX_SIZE && !sk_is_tcp(sk))
max_size = GSO_LEGACY_MAX_SIZE;
return max_size - (MAX_TCP_HEADER + 1);
}
void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
{
u32 max_segs = 1;
sk->sk_route_caps = dst->dev->features;
if (sk_is_tcp(sk))
sk->sk_route_caps |= NETIF_F_GSO;
if (sk->sk_route_caps & NETIF_F_GSO)
sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
if (unlikely(sk->sk_gso_disabled))
sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
if (sk_can_gso(sk)) {
if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
} else {
sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
sk->sk_gso_max_size = sk_dst_gso_max_size(sk, dst);
/* pairs with the WRITE_ONCE() in netif_set_gso_max_segs() */
max_segs = max_t(u32, READ_ONCE(dst->dev->gso_max_segs), 1);
}
}
sk->sk_gso_max_segs = max_segs;
sk_dst_set(sk, dst);
}
EXPORT_SYMBOL_GPL(sk_setup_caps);
/*
* Simple resource managers for sockets.
*/
/*
* Write buffer destructor automatically called from kfree_skb.
*/
void sock_wfree(struct sk_buff *skb)
{
struct sock *sk = skb->sk;
unsigned int len = skb->truesize;
bool free;
if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
if (sock_flag(sk, SOCK_RCU_FREE) &&
sk->sk_write_space == sock_def_write_space) {
rcu_read_lock();
free = refcount_sub_and_test(len, &sk->sk_wmem_alloc);
sock_def_write_space_wfree(sk);
rcu_read_unlock();
if (unlikely(free))
__sk_free(sk);
return;
}
/*
* Keep a reference on sk_wmem_alloc, this will be released
* after sk_write_space() call
*/
WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
sk->sk_write_space(sk);
len = 1;
}
/*
* if sk_wmem_alloc reaches 0, we must finish what sk_free()
* could not do because of in-flight packets
*/
if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
__sk_free(sk);
}
EXPORT_SYMBOL(sock_wfree);
/* This variant of sock_wfree() is used by TCP,
* since it sets SOCK_USE_WRITE_QUEUE.
*/
void __sock_wfree(struct sk_buff *skb)
{
struct sock *sk = skb->sk;
if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
__sk_free(sk);
}
void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
{
skb_orphan(skb);
skb->sk = sk;
#ifdef CONFIG_INET
if (unlikely(!sk_fullsock(sk))) {
skb->destructor = sock_edemux;
sock_hold(sk);
return;
}
#endif
skb->destructor = sock_wfree;
skb_set_hash_from_sk(skb, sk);
/*
* We used to take a refcount on sk, but following operation
* is enough to guarantee sk_free() won't free this sock until
* all in-flight packets are completed
*/
refcount_add(skb->truesize, &sk->sk_wmem_alloc);
}
EXPORT_SYMBOL(skb_set_owner_w);
static bool can_skb_orphan_partial(const struct sk_buff *skb)
{
/* Drivers depend on in-order delivery for crypto offload,
* partial orphan breaks out-of-order-OK logic.
*/
if (skb_is_decrypted(skb))
return false;
return (skb->destructor == sock_wfree ||
(IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree));
}
/* This helper is used by netem, as it can hold packets in its
* delay queue. We want to allow the owner socket to send more
* packets, as if they were already TX completed by a typical driver.
* But we also want to keep skb->sk set because some packet schedulers
* rely on it (sch_fq for example).
*/
void skb_orphan_partial(struct sk_buff *skb)
{
if (skb_is_tcp_pure_ack(skb))
return;
if (can_skb_orphan_partial(skb) && skb_set_owner_sk_safe(skb, skb->sk))
return;
skb_orphan(skb);
}
EXPORT_SYMBOL(skb_orphan_partial);
/*
* Read buffer destructor automatically called from kfree_skb.
*/
void sock_rfree(struct sk_buff *skb)
{
struct sock *sk = skb->sk;
unsigned int len = skb->truesize;
atomic_sub(len, &sk->sk_rmem_alloc);
sk_mem_uncharge(sk, len);
}
EXPORT_SYMBOL(sock_rfree);
/*
* Buffer destructor for skbs that are not used directly in read or write
* path, e.g. for error handler skbs. Automatically called from kfree_skb.
*/
void sock_efree(struct sk_buff *skb)
{
sock_put(skb->sk);
}
EXPORT_SYMBOL(sock_efree);
/* Buffer destructor for prefetch/receive path where reference count may
* not be held, e.g. for listen sockets.
*/
#ifdef CONFIG_INET
void sock_pfree(struct sk_buff *skb)
{
struct sock *sk = skb->sk;
if (!sk_is_refcounted(sk))
return;
if (sk->sk_state == TCP_NEW_SYN_RECV && inet_reqsk(sk)->syncookie) {
inet_reqsk(sk)->rsk_listener = NULL;
reqsk_free(inet_reqsk(sk));
return;
}
sock_gen_put(sk);
}
EXPORT_SYMBOL(sock_pfree);
#endif /* CONFIG_INET */
kuid_t sock_i_uid(struct sock *sk)
{
kuid_t uid;
read_lock_bh(&sk->sk_callback_lock);
uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
read_unlock_bh(&sk->sk_callback_lock);
return uid;
}
EXPORT_SYMBOL(sock_i_uid);
unsigned long __sock_i_ino(struct sock *sk)
{
unsigned long ino;
read_lock(&sk->sk_callback_lock);
ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
read_unlock(&sk->sk_callback_lock);
return ino;
}
EXPORT_SYMBOL(__sock_i_ino);
unsigned long sock_i_ino(struct sock *sk)
{
unsigned long ino;
local_bh_disable();
ino = __sock_i_ino(sk);
local_bh_enable();
return ino;
}
EXPORT_SYMBOL(sock_i_ino);
/*
* Allocate a skb from the socket's send buffer.
*/
struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
gfp_t priority)
{
if (force ||
refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf)) {
struct sk_buff *skb = alloc_skb(size, priority);
if (skb) {
skb_set_owner_w(skb, sk);
return skb;
}
}
return NULL;
}
EXPORT_SYMBOL(sock_wmalloc);
static void sock_ofree(struct sk_buff *skb)
{
struct sock *sk = skb->sk;
atomic_sub(skb->truesize, &sk->sk_omem_alloc);
}
struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
gfp_t priority)
{
struct sk_buff *skb;
/* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
READ_ONCE(sock_net(sk)->core.sysctl_optmem_max))
return NULL;
skb = alloc_skb(size, priority);
if (!skb)
return NULL;
atomic_add(skb->truesize, &sk->sk_omem_alloc);
skb->sk = sk;
skb->destructor = sock_ofree;
return skb;
}
/*
* Allocate a memory block from the socket's option memory buffer.
*/
void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
{
int optmem_max = READ_ONCE(sock_net(sk)->core.sysctl_optmem_max);
if ((unsigned int)size <= optmem_max &&
atomic_read(&sk->sk_omem_alloc) + size < optmem_max) {
void *mem;
/* First do the add, to avoid the race if kmalloc
* might sleep.
*/
atomic_add(size, &sk->sk_omem_alloc);
mem = kmalloc(size, priority);
if (mem)
return mem;
atomic_sub(size, &sk->sk_omem_alloc);
}
return NULL;
}
EXPORT_SYMBOL(sock_kmalloc);
/* Free an option memory block. Note, we actually want the inline
* here as this allows gcc to detect the nullify and fold away the
* condition entirely.
*/
static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
const bool nullify)
{
if (WARN_ON_ONCE(!mem))
return;
if (nullify)
kfree_sensitive(mem);
else
kfree(mem);
atomic_sub(size, &sk->sk_omem_alloc);
}
void sock_kfree_s(struct sock *sk, void *mem, int size)
{
__sock_kfree_s(sk, mem, size, false);
}
EXPORT_SYMBOL(sock_kfree_s);
void sock_kzfree_s(struct sock *sk, void *mem, int size)
{
__sock_kfree_s(sk, mem, size, true);
}
EXPORT_SYMBOL(sock_kzfree_s);
/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
I think, these locks should be removed for datagram sockets.
*/
static long sock_wait_for_wmem(struct sock *sk, long timeo)
{
DEFINE_WAIT(wait);
sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
for (;;) {
if (!timeo)
break;
if (signal_pending(current))
break;
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
if (refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf))
break;
if (READ_ONCE(sk->sk_shutdown) & SEND_SHUTDOWN)
break;
if (READ_ONCE(sk->sk_err))
break;
timeo = schedule_timeout(timeo);
}
finish_wait(sk_sleep(sk), &wait);
return timeo;
}
/*
* Generic send/receive buffer handlers
*/
struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
unsigned long data_len, int noblock,
int *errcode, int max_page_order)
{
struct sk_buff *skb;
long timeo;
int err;
timeo = sock_sndtimeo(sk, noblock);
for (;;) {
err = sock_error(sk);
if (err != 0)
goto failure;
err = -EPIPE;
if (READ_ONCE(sk->sk_shutdown) & SEND_SHUTDOWN)
goto failure;
if (sk_wmem_alloc_get(sk) < READ_ONCE(sk->sk_sndbuf))
break;
sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
err = -EAGAIN;
if (!timeo)
goto failure;
if (signal_pending(current))
goto interrupted;
timeo = sock_wait_for_wmem(sk, timeo);
}
skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
errcode, sk->sk_allocation);
if (skb)
skb_set_owner_w(skb, sk);
return skb;
interrupted:
err = sock_intr_errno(timeo);
failure:
*errcode = err;
return NULL;
}
EXPORT_SYMBOL(sock_alloc_send_pskb);
int __sock_cmsg_send(struct sock *sk, struct cmsghdr *cmsg,
struct sockcm_cookie *sockc)
{
u32 tsflags;
switch (cmsg->cmsg_type) {
case SO_MARK:
if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM;
if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
return -EINVAL;
sockc->mark = *(u32 *)CMSG_DATA(cmsg);
break;
case SO_TIMESTAMPING_OLD:
case SO_TIMESTAMPING_NEW:
if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
return -EINVAL;
tsflags = *(u32 *)CMSG_DATA(cmsg);
if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
return -EINVAL;
sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
sockc->tsflags |= tsflags;
break;
case SCM_TXTIME:
if (!sock_flag(sk, SOCK_TXTIME))
return -EINVAL;
if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64)))
return -EINVAL;
sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg));
break;
/* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
case SCM_RIGHTS:
case SCM_CREDENTIALS:
break;
default:
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL(__sock_cmsg_send);
int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
struct sockcm_cookie *sockc)
{
struct cmsghdr *cmsg;
int ret;
for_each_cmsghdr(cmsg, msg) {
if (!CMSG_OK(msg, cmsg))
return -EINVAL;
if (cmsg->cmsg_level != SOL_SOCKET)
continue;
ret = __sock_cmsg_send(sk, cmsg, sockc);
if (ret)
return ret;
}
return 0;
}
EXPORT_SYMBOL(sock_cmsg_send);
static void sk_enter_memory_pressure(struct sock *sk)
{
if (!sk->sk_prot->enter_memory_pressure)
return;
sk->sk_prot->enter_memory_pressure(sk);
}
static void sk_leave_memory_pressure(struct sock *sk)
{
if (sk->sk_prot->leave_memory_pressure) {
INDIRECT_CALL_INET_1(sk->sk_prot->leave_memory_pressure,
tcp_leave_memory_pressure, sk);
} else {
unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
if (memory_pressure && READ_ONCE(*memory_pressure))
WRITE_ONCE(*memory_pressure, 0);
}
}
DEFINE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key);
/**
* skb_page_frag_refill - check that a page_frag contains enough room
* @sz: minimum size of the fragment we want to get
* @pfrag: pointer to page_frag
* @gfp: priority for memory allocation
*
* Note: While this allocator tries to use high order pages, there is
* no guarantee that allocations succeed. Therefore, @sz MUST be
* less or equal than PAGE_SIZE.
*/
bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
{
if (pfrag->page) {
if (page_ref_count(pfrag->page) == 1) {
pfrag->offset = 0;
return true;
}
if (pfrag->offset + sz <= pfrag->size)
return true;
put_page(pfrag->page);
}
pfrag->offset = 0;
if (SKB_FRAG_PAGE_ORDER &&
!static_branch_unlikely(&net_high_order_alloc_disable_key)) {
/* Avoid direct reclaim but allow kswapd to wake */
pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
__GFP_COMP | __GFP_NOWARN |
__GFP_NORETRY,
SKB_FRAG_PAGE_ORDER);
if (likely(pfrag->page)) {
pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
return true;
}
}
pfrag->page = alloc_page(gfp);
if (likely(pfrag->page)) {
pfrag->size = PAGE_SIZE;
return true;
}
return false;
}
EXPORT_SYMBOL(skb_page_frag_refill);
bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
{
if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
return true;
sk_enter_memory_pressure(sk);
sk_stream_moderate_sndbuf(sk);
return false;
}
EXPORT_SYMBOL(sk_page_frag_refill);
void __lock_sock(struct sock *sk)
__releases(&sk->sk_lock.slock)
__acquires(&sk->sk_lock.slock)
{
DEFINE_WAIT(wait);
for (;;) {
prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
TASK_UNINTERRUPTIBLE);
spin_unlock_bh(&sk->sk_lock.slock);
schedule();
spin_lock_bh(&sk->sk_lock.slock);
if (!sock_owned_by_user(sk))
break;
}
finish_wait(&sk->sk_lock.wq, &wait);
}
void __release_sock(struct sock *sk)
__releases(&sk->sk_lock.slock)
__acquires(&sk->sk_lock.slock)
{
struct sk_buff *skb, *next;
while ((skb = sk->sk_backlog.head) != NULL) {
sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
spin_unlock_bh(&sk->sk_lock.slock);
do {
next = skb->next;
prefetch(next);
DEBUG_NET_WARN_ON_ONCE(skb_dst_is_noref(skb));
skb_mark_not_on_list(skb);
sk_backlog_rcv(sk, skb);
cond_resched();
skb = next;
} while (skb != NULL);
spin_lock_bh(&sk->sk_lock.slock);
}
/*
* Doing the zeroing here guarantee we can not loop forever
* while a wild producer attempts to flood us.
*/
sk->sk_backlog.len = 0;
}
void __sk_flush_backlog(struct sock *sk)
{
spin_lock_bh(&sk->sk_lock.slock);
__release_sock(sk);
if (sk->sk_prot->release_cb)
INDIRECT_CALL_INET_1(sk->sk_prot->release_cb,
tcp_release_cb, sk);
spin_unlock_bh(&sk->sk_lock.slock);
}
EXPORT_SYMBOL_GPL(__sk_flush_backlog);
/**
* sk_wait_data - wait for data to arrive at sk_receive_queue
* @sk: sock to wait on
* @timeo: for how long
* @skb: last skb seen on sk_receive_queue
*
* Now socket state including sk->sk_err is changed only under lock,
* hence we may omit checks after joining wait queue.
* We check receive queue before schedule() only as optimization;
* it is very likely that release_sock() added new data.
*/
int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
{
DEFINE_WAIT_FUNC(wait, woken_wake_function);
int rc;
add_wait_queue(sk_sleep(sk), &wait);
sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
remove_wait_queue(sk_sleep(sk), &wait);
return rc;
}
EXPORT_SYMBOL(sk_wait_data);
/**
* __sk_mem_raise_allocated - increase memory_allocated
* @sk: socket
* @size: memory size to allocate
* @amt: pages to allocate
* @kind: allocation type
*
* Similar to __sk_mem_schedule(), but does not update sk_forward_alloc.
*
* Unlike the globally shared limits among the sockets under same protocol,
* consuming the budget of a memcg won't have direct effect on other ones.
* So be optimistic about memcg's tolerance, and leave the callers to decide
* whether or not to raise allocated through sk_under_memory_pressure() or
* its variants.
*/
int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
{
struct mem_cgroup *memcg = mem_cgroup_sockets_enabled ? sk->sk_memcg : NULL;
struct proto *prot = sk->sk_prot;
bool charged = false;
long allocated;
sk_memory_allocated_add(sk, amt);
allocated = sk_memory_allocated(sk);
if (memcg) {
if (!mem_cgroup_charge_skmem(memcg, amt, gfp_memcg_charge()))
goto suppress_allocation;
charged = true;
}
/* Under limit. */
if (allocated <= sk_prot_mem_limits(sk, 0)) {
sk_leave_memory_pressure(sk);
return 1;
}
/* Under pressure. */
if (allocated > sk_prot_mem_limits(sk, 1))
sk_enter_memory_pressure(sk);
/* Over hard limit. */
if (allocated > sk_prot_mem_limits(sk, 2))
goto suppress_allocation;
/* Guarantee minimum buffer size under pressure (either global
* or memcg) to make sure features described in RFC 7323 (TCP
* Extensions for High Performance) work properly.
*
* This rule does NOT stand when exceeds global or memcg's hard
* limit, or else a DoS attack can be taken place by spawning
* lots of sockets whose usage are under minimum buffer size.
*/
if (kind == SK_MEM_RECV) {
if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
return 1;
} else { /* SK_MEM_SEND */
int wmem0 = sk_get_wmem0(sk, prot);
if (sk->sk_type == SOCK_STREAM) {
if (sk->sk_wmem_queued < wmem0)
return 1;
} else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
return 1;
}
}
if (sk_has_memory_pressure(sk)) {
u64 alloc;
/* The following 'average' heuristic is within the
* scope of global accounting, so it only makes
* sense for global memory pressure.
*/
if (!sk_under_global_memory_pressure(sk))
return 1;
/* Try to be fair among all the sockets under global
* pressure by allowing the ones that below average
* usage to raise.
*/
alloc = sk_sockets_allocated_read_positive(sk);
if (sk_prot_mem_limits(sk, 2) > alloc *
sk_mem_pages(sk->sk_wmem_queued +
atomic_read(&sk->sk_rmem_alloc) +
sk->sk_forward_alloc))
return 1;
}
suppress_allocation:
if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
sk_stream_moderate_sndbuf(sk);
/* Fail only if socket is _under_ its sndbuf.
* In this case we cannot block, so that we have to fail.
*/
if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) {
/* Force charge with __GFP_NOFAIL */
if (memcg && !charged) {
mem_cgroup_charge_skmem(memcg, amt,
gfp_memcg_charge() | __GFP_NOFAIL);
}
return 1;
}
}
if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged))
trace_sock_exceed_buf_limit(sk, prot, allocated, kind);
sk_memory_allocated_sub(sk, amt);
if (charged)
mem_cgroup_uncharge_skmem(memcg, amt);
return 0;
}
/**
* __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
* @sk: socket
* @size: memory size to allocate
* @kind: allocation type
*
* If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
* rmem allocation. This function assumes that protocols which have
* memory_pressure use sk_wmem_queued as write buffer accounting.
*/
int __sk_mem_schedule(struct sock *sk, int size, int kind)
{
int ret, amt = sk_mem_pages(size);
sk_forward_alloc_add(sk, amt << PAGE_SHIFT);
ret = __sk_mem_raise_allocated(sk, size, amt, kind);
if (!ret)
sk_forward_alloc_add(sk, -(amt << PAGE_SHIFT));
return ret;
}
EXPORT_SYMBOL(__sk_mem_schedule);
/**
* __sk_mem_reduce_allocated - reclaim memory_allocated
* @sk: socket
* @amount: number of quanta
*
* Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
*/
void __sk_mem_reduce_allocated(struct sock *sk, int amount)
{
sk_memory_allocated_sub(sk, amount);
if (mem_cgroup_sockets_enabled && sk->sk_memcg)
mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
if (sk_under_global_memory_pressure(sk) &&
(sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
sk_leave_memory_pressure(sk);
}
/**
* __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
* @sk: socket
* @amount: number of bytes (rounded down to a PAGE_SIZE multiple)
*/
void __sk_mem_reclaim(struct sock *sk, int amount)
{
amount >>= PAGE_SHIFT;
sk_forward_alloc_add(sk, -(amount << PAGE_SHIFT));
__sk_mem_reduce_allocated(sk, amount);
}
EXPORT_SYMBOL(__sk_mem_reclaim);
int sk_set_peek_off(struct sock *sk, int val)
{
WRITE_ONCE(sk->sk_peek_off, val);
return 0;
}
EXPORT_SYMBOL_GPL(sk_set_peek_off);
/*
* Set of default routines for initialising struct proto_ops when
* the protocol does not support a particular function. In certain
* cases where it makes no sense for a protocol to have a "do nothing"
* function, some default processing is provided.
*/
int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
{
return -EOPNOTSUPP;
}
EXPORT_SYMBOL(sock_no_bind);
int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
int len, int flags)
{
return -EOPNOTSUPP;
}
EXPORT_SYMBOL(sock_no_connect);
int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
{
return -EOPNOTSUPP;
}
EXPORT_SYMBOL(sock_no_socketpair);
int sock_no_accept(struct socket *sock, struct socket *newsock,
struct proto_accept_arg *arg)
{
return -EOPNOTSUPP;
}
EXPORT_SYMBOL(sock_no_accept);
int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
int peer)
{
return -EOPNOTSUPP;
}
EXPORT_SYMBOL(sock_no_getname);
int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
return -EOPNOTSUPP;
}
EXPORT_SYMBOL(sock_no_ioctl);
int sock_no_listen(struct socket *sock, int backlog)
{
return -EOPNOTSUPP;
}
EXPORT_SYMBOL(sock_no_listen);
int sock_no_shutdown(struct socket *sock, int how)
{
return -EOPNOTSUPP;
}
EXPORT_SYMBOL(sock_no_shutdown);
int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
{
return -EOPNOTSUPP;
}
EXPORT_SYMBOL(sock_no_sendmsg);
int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
{
return -EOPNOTSUPP;
}
EXPORT_SYMBOL(sock_no_sendmsg_locked);
int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
int flags)
{
return -EOPNOTSUPP;
}
EXPORT_SYMBOL(sock_no_recvmsg);
int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
{
/* Mirror missing mmap method error code */
return -ENODEV;
}
EXPORT_SYMBOL(sock_no_mmap);
/*
* When a file is received (via SCM_RIGHTS, etc), we must bump the
* various sock-based usage counts.
*/
void __receive_sock(struct file *file)
{
struct socket *sock;
sock = sock_from_file(file);
if (sock) {
sock_update_netprioidx(&sock->sk->sk_cgrp_data);
sock_update_classid(&sock->sk->sk_cgrp_data);
}
}
/*
* Default Socket Callbacks
*/
static void sock_def_wakeup(struct sock *sk)
{
struct socket_wq *wq;
rcu_read_lock();
wq = rcu_dereference(sk->sk_wq);
if (skwq_has_sleeper(wq))
wake_up_interruptible_all(&wq->wait);
rcu_read_unlock();
}
static void sock_def_error_report(struct sock *sk)
{
struct socket_wq *wq;
rcu_read_lock();
wq = rcu_dereference(sk->sk_wq);
if (skwq_has_sleeper(wq))
wake_up_interruptible_poll(&wq->wait, EPOLLERR);
sk_wake_async_rcu(sk, SOCK_WAKE_IO, POLL_ERR);
rcu_read_unlock();
}
void sock_def_readable(struct sock *sk)
{
struct socket_wq *wq;
trace_sk_data_ready(sk);
rcu_read_lock();
wq = rcu_dereference(sk->sk_wq);
if (skwq_has_sleeper(wq))
wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
EPOLLRDNORM | EPOLLRDBAND);
sk_wake_async_rcu(sk, SOCK_WAKE_WAITD, POLL_IN);
rcu_read_unlock();
}
static void sock_def_write_space(struct sock *sk)
{
struct socket_wq *wq;
rcu_read_lock();
/* Do not wake up a writer until he can make "significant"
* progress. --DaveM
*/
if (sock_writeable(sk)) {
wq = rcu_dereference(sk->sk_wq);
if (skwq_has_sleeper(wq))
wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
EPOLLWRNORM | EPOLLWRBAND);
/* Should agree with poll, otherwise some programs break */
sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT);
}
rcu_read_unlock();
}
/* An optimised version of sock_def_write_space(), should only be called
* for SOCK_RCU_FREE sockets under RCU read section and after putting
* ->sk_wmem_alloc.
*/
static void sock_def_write_space_wfree(struct sock *sk)
{
/* Do not wake up a writer until he can make "significant"
* progress. --DaveM
*/
if (sock_writeable(sk)) {
struct socket_wq *wq = rcu_dereference(sk->sk_wq);
/* rely on refcount_sub from sock_wfree() */
smp_mb__after_atomic();
if (wq && waitqueue_active(&wq->wait))
wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
EPOLLWRNORM | EPOLLWRBAND);
/* Should agree with poll, otherwise some programs break */
sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT);
}
}
static void sock_def_destruct(struct sock *sk)
{
}
void sk_send_sigurg(struct sock *sk)
{
if (sk->sk_socket && sk->sk_socket->file)
if (send_sigurg(&sk->sk_socket->file->f_owner))
sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
}
EXPORT_SYMBOL(sk_send_sigurg);
void sk_reset_timer(struct sock *sk, struct timer_list* timer,
unsigned long expires)
{
if (!mod_timer(timer, expires))
sock_hold(sk);
}
EXPORT_SYMBOL(sk_reset_timer);
void sk_stop_timer(struct sock *sk, struct timer_list* timer)
{
if (del_timer(timer))
__sock_put(sk);
}
EXPORT_SYMBOL(sk_stop_timer);
void sk_stop_timer_sync(struct sock *sk, struct timer_list *timer)
{
if (del_timer_sync(timer))
__sock_put(sk);
}
EXPORT_SYMBOL(sk_stop_timer_sync);
void sock_init_data_uid(struct socket *sock, struct sock *sk, kuid_t uid)
{
sk_init_common(sk);
sk->sk_send_head = NULL;
timer_setup(&sk->sk_timer, NULL, 0);
sk->sk_allocation = GFP_KERNEL;
sk->sk_rcvbuf = READ_ONCE(sysctl_rmem_default);
sk->sk_sndbuf = READ_ONCE(sysctl_wmem_default);
sk->sk_state = TCP_CLOSE;
sk->sk_use_task_frag = true;
sk_set_socket(sk, sock);
sock_set_flag(sk, SOCK_ZAPPED);
if (sock) {
sk->sk_type = sock->type;
RCU_INIT_POINTER(sk->sk_wq, &sock->wq);
sock->sk = sk;
} else {
RCU_INIT_POINTER(sk->sk_wq, NULL);
}
sk->sk_uid = uid;
sk->sk_state_change = sock_def_wakeup;
sk->sk_data_ready = sock_def_readable;
sk->sk_write_space = sock_def_write_space;
sk->sk_error_report = sock_def_error_report;
sk->sk_destruct = sock_def_destruct;
sk->sk_frag.page = NULL;
sk->sk_frag.offset = 0;
sk->sk_peek_off = -1;
sk->sk_peer_pid = NULL;
sk->sk_peer_cred = NULL;
spin_lock_init(&sk->sk_peer_lock);
sk->sk_write_pending = 0;
sk->sk_rcvlowat = 1;
sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
sk->sk_stamp = SK_DEFAULT_STAMP;
#if BITS_PER_LONG==32
seqlock_init(&sk->sk_stamp_seq);
#endif
atomic_set(&sk->sk_zckey, 0);
#ifdef CONFIG_NET_RX_BUSY_POLL
sk->sk_napi_id = 0;
sk->sk_ll_usec = READ_ONCE(sysctl_net_busy_read);
#endif
sk->sk_max_pacing_rate = ~0UL;
sk->sk_pacing_rate = ~0UL;
WRITE_ONCE(sk->sk_pacing_shift, 10);
sk->sk_incoming_cpu = -1;
sk_rx_queue_clear(sk);
/*
* Before updating sk_refcnt, we must commit prior changes to memory
* (Documentation/RCU/rculist_nulls.rst for details)
*/
smp_wmb();
refcount_set(&sk->sk_refcnt, 1);
atomic_set(&sk->sk_drops, 0);
}
EXPORT_SYMBOL(sock_init_data_uid);
void sock_init_data(struct socket *sock, struct sock *sk)
{
kuid_t uid = sock ?
SOCK_INODE(sock)->i_uid :
make_kuid(sock_net(sk)->user_ns, 0);
sock_init_data_uid(sock, sk, uid);
}
EXPORT_SYMBOL(sock_init_data);
void lock_sock_nested(struct sock *sk, int subclass)
{
/* The sk_lock has mutex_lock() semantics here. */
mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
might_sleep();
spin_lock_bh(&sk->sk_lock.slock);
if (sock_owned_by_user_nocheck(sk))
__lock_sock(sk);
sk->sk_lock.owned = 1;
spin_unlock_bh(&sk->sk_lock.slock);
}
EXPORT_SYMBOL(lock_sock_nested);
void release_sock(struct sock *sk)
{
spin_lock_bh(&sk->sk_lock.slock);
if (sk->sk_backlog.tail)
__release_sock(sk);
if (sk->sk_prot->release_cb)
INDIRECT_CALL_INET_1(sk->sk_prot->release_cb,
tcp_release_cb, sk);
sock_release_ownership(sk);
if (waitqueue_active(&sk->sk_lock.wq))
wake_up(&sk->sk_lock.wq);
spin_unlock_bh(&sk->sk_lock.slock);
}
EXPORT_SYMBOL(release_sock);
bool __lock_sock_fast(struct sock *sk) __acquires(&sk->sk_lock.slock)
{
might_sleep();
spin_lock_bh(&sk->sk_lock.slock);
if (!sock_owned_by_user_nocheck(sk)) {
/*
* Fast path return with bottom halves disabled and
* sock::sk_lock.slock held.
*
* The 'mutex' is not contended and holding
* sock::sk_lock.slock prevents all other lockers to
* proceed so the corresponding unlock_sock_fast() can
* avoid the slow path of release_sock() completely and
* just release slock.
*
* From a semantical POV this is equivalent to 'acquiring'
* the 'mutex', hence the corresponding lockdep
* mutex_release() has to happen in the fast path of
* unlock_sock_fast().
*/
return false;
}
__lock_sock(sk);
sk->sk_lock.owned = 1;
__acquire(&sk->sk_lock.slock);
spin_unlock_bh(&sk->sk_lock.slock);
return true;
}
EXPORT_SYMBOL(__lock_sock_fast);
int sock_gettstamp(struct socket *sock, void __user *userstamp,
bool timeval, bool time32)
{
struct sock *sk = sock->sk;
struct timespec64 ts;
sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ts = ktime_to_timespec64(sock_read_timestamp(sk));
if (ts.tv_sec == -1)
return -ENOENT;
if (ts.tv_sec == 0) {
ktime_t kt = ktime_get_real();
sock_write_timestamp(sk, kt);
ts = ktime_to_timespec64(kt);
}
if (timeval)
ts.tv_nsec /= 1000;
#ifdef CONFIG_COMPAT_32BIT_TIME
if (time32)
return put_old_timespec32(&ts, userstamp);
#endif
#ifdef CONFIG_SPARC64
/* beware of padding in sparc64 timeval */
if (timeval && !in_compat_syscall()) {
struct __kernel_old_timeval __user tv = {
.tv_sec = ts.tv_sec,
.tv_usec = ts.tv_nsec,
};
if (copy_to_user(userstamp, &tv, sizeof(tv)))
return -EFAULT;
return 0;
}
#endif
return put_timespec64(&ts, userstamp);
}
EXPORT_SYMBOL(sock_gettstamp);
void sock_enable_timestamp(struct sock *sk, enum sock_flags flag)
{
if (!sock_flag(sk, flag)) {
unsigned long previous_flags = sk->sk_flags;
sock_set_flag(sk, flag);
/*
* we just set one of the two flags which require net
* time stamping, but time stamping might have been on
* already because of the other one
*/
if (sock_needs_netstamp(sk) &&
!(previous_flags & SK_FLAGS_TIMESTAMP))
net_enable_timestamp();
}
}
int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
int level, int type)
{
struct sock_exterr_skb *serr;
struct sk_buff *skb;
int copied, err;
err = -EAGAIN;
skb = sock_dequeue_err_skb(sk);
if (skb == NULL)
goto out;
copied = skb->len;
if (copied > len) {
msg->msg_flags |= MSG_TRUNC;
copied = len;
}
err = skb_copy_datagram_msg(skb, 0, msg, copied);
if (err)
goto out_free_skb;
sock_recv_timestamp(msg, sk, skb);
serr = SKB_EXT_ERR(skb);
put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
msg->msg_flags |= MSG_ERRQUEUE;
err = copied;
out_free_skb:
kfree_skb(skb);
out:
return err;
}
EXPORT_SYMBOL(sock_recv_errqueue);
/*
* Get a socket option on an socket.
*
* FIX: POSIX 1003.1g is very ambiguous here. It states that
* asynchronous errors should be reported by getsockopt. We assume
* this means if you specify SO_ERROR (otherwise what is the point of it).
*/
int sock_common_getsockopt(struct socket *sock, int level, int optname,
char __user *optval, int __user *optlen)
{
struct sock *sk = sock->sk;
/* IPV6_ADDRFORM can change sk->sk_prot under us. */
return READ_ONCE(sk->sk_prot)->getsockopt(sk, level, optname, optval, optlen);
}
EXPORT_SYMBOL(sock_common_getsockopt);
int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
int flags)
{
struct sock *sk = sock->sk;
int addr_len = 0;
int err;
err = sk->sk_prot->recvmsg(sk, msg, size, flags, &addr_len);
if (err >= 0)
msg->msg_namelen = addr_len;
return err;
}
EXPORT_SYMBOL(sock_common_recvmsg);
/*
* Set socket options on an inet socket.
*/
int sock_common_setsockopt(struct socket *sock, int level, int optname,
sockptr_t optval, unsigned int optlen)
{
struct sock *sk = sock->sk;
/* IPV6_ADDRFORM can change sk->sk_prot under us. */
return READ_ONCE(sk->sk_prot)->setsockopt(sk, level, optname, optval, optlen);
}
EXPORT_SYMBOL(sock_common_setsockopt);
void sk_common_release(struct sock *sk)
{
if (sk->sk_prot->destroy)
sk->sk_prot->destroy(sk);
/*
* Observation: when sk_common_release is called, processes have
* no access to socket. But net still has.
* Step one, detach it from networking:
*
* A. Remove from hash tables.
*/
sk->sk_prot->unhash(sk);
if (sk->sk_socket)
sk->sk_socket->sk = NULL;
/*
* In this point socket cannot receive new packets, but it is possible
* that some packets are in flight because some CPU runs receiver and
* did hash table lookup before we unhashed socket. They will achieve
* receive queue and will be purged by socket destructor.
*
* Also we still have packets pending on receive queue and probably,
* our own packets waiting in device queues. sock_destroy will drain
* receive queue, but transmitted packets will delay socket destruction
* until the last reference will be released.
*/
sock_orphan(sk);
xfrm_sk_free_policy(sk);
sock_put(sk);
}
EXPORT_SYMBOL(sk_common_release);
void sk_get_meminfo(const struct sock *sk, u32 *mem)
{
memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
mem[SK_MEMINFO_RCVBUF] = READ_ONCE(sk->sk_rcvbuf);
mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
mem[SK_MEMINFO_SNDBUF] = READ_ONCE(sk->sk_sndbuf);
mem[SK_MEMINFO_FWD_ALLOC] = sk_forward_alloc_get(sk);
mem[SK_MEMINFO_WMEM_QUEUED] = READ_ONCE(sk->sk_wmem_queued);
mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
}
#ifdef CONFIG_PROC_FS
static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
int sock_prot_inuse_get(struct net *net, struct proto *prot)
{
int cpu, idx = prot->inuse_idx;
int res = 0;
for_each_possible_cpu(cpu)
res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
return res >= 0 ? res : 0;
}
EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
int sock_inuse_get(struct net *net)
{
int cpu, res = 0;
for_each_possible_cpu(cpu)
res += per_cpu_ptr(net->core.prot_inuse, cpu)->all;
return res;
}
EXPORT_SYMBOL_GPL(sock_inuse_get);
static int __net_init sock_inuse_init_net(struct net *net)
{
net->core.prot_inuse = alloc_percpu(struct prot_inuse);
if (net->core.prot_inuse == NULL)
return -ENOMEM;
return 0;
}
static void __net_exit sock_inuse_exit_net(struct net *net)
{
free_percpu(net->core.prot_inuse);
}
static struct pernet_operations net_inuse_ops = {
.init = sock_inuse_init_net,
.exit = sock_inuse_exit_net,
};
static __init int net_inuse_init(void)
{
if (register_pernet_subsys(&net_inuse_ops))
panic("Cannot initialize net inuse counters");
return 0;
}
core_initcall(net_inuse_init);
static int assign_proto_idx(struct proto *prot)
{
prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
pr_err("PROTO_INUSE_NR exhausted\n");
return -ENOSPC;
}
set_bit(prot->inuse_idx, proto_inuse_idx);
return 0;
}
static void release_proto_idx(struct proto *prot)
{
if (prot->inuse_idx != PROTO_INUSE_NR - 1)
clear_bit(prot->inuse_idx, proto_inuse_idx);
}
#else
static inline int assign_proto_idx(struct proto *prot)
{
return 0;
}
static inline void release_proto_idx(struct proto *prot)
{
}
#endif
static void tw_prot_cleanup(struct timewait_sock_ops *twsk_prot)
{
if (!twsk_prot)
return;
kfree(twsk_prot->twsk_slab_name);
twsk_prot->twsk_slab_name = NULL;
kmem_cache_destroy(twsk_prot->twsk_slab);
twsk_prot->twsk_slab = NULL;
}
static int tw_prot_init(const struct proto *prot)
{
struct timewait_sock_ops *twsk_prot = prot->twsk_prot;
if (!twsk_prot)
return 0;
twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s",
prot->name);
if (!twsk_prot->twsk_slab_name)
return -ENOMEM;
twsk_prot->twsk_slab =
kmem_cache_create(twsk_prot->twsk_slab_name,
twsk_prot->twsk_obj_size, 0,
SLAB_ACCOUNT | prot->slab_flags,
NULL);
if (!twsk_prot->twsk_slab) {
pr_crit("%s: Can't create timewait sock SLAB cache!\n",
prot->name);
return -ENOMEM;
}
return 0;
}
static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
{
if (!rsk_prot)
return;
kfree(rsk_prot->slab_name);
rsk_prot->slab_name = NULL;
kmem_cache_destroy(rsk_prot->slab);
rsk_prot->slab = NULL;
}
static int req_prot_init(const struct proto *prot)
{
struct request_sock_ops *rsk_prot = prot->rsk_prot;
if (!rsk_prot)
return 0;
rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
prot->name);
if (!rsk_prot->slab_name)
return -ENOMEM;
rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
rsk_prot->obj_size, 0,
SLAB_ACCOUNT | prot->slab_flags,
NULL);
if (!rsk_prot->slab) {
pr_crit("%s: Can't create request sock SLAB cache!\n",
prot->name);
return -ENOMEM;
}
return 0;
}
int proto_register(struct proto *prot, int alloc_slab)
{
int ret = -ENOBUFS;
if (prot->memory_allocated && !prot->sysctl_mem) {
pr_err("%s: missing sysctl_mem\n", prot->name);
return -EINVAL;
}
if (prot->memory_allocated && !prot->per_cpu_fw_alloc) {
pr_err("%s: missing per_cpu_fw_alloc\n", prot->name);
return -EINVAL;
}
if (alloc_slab) {
prot->slab = kmem_cache_create_usercopy(prot->name,
prot->obj_size, 0,
SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT |
prot->slab_flags,
prot->useroffset, prot->usersize,
NULL);
if (prot->slab == NULL) {
pr_crit("%s: Can't create sock SLAB cache!\n",
prot->name);
goto out;
}
if (req_prot_init(prot))
goto out_free_request_sock_slab;
if (tw_prot_init(prot))
goto out_free_timewait_sock_slab;
}
mutex_lock(&proto_list_mutex);
ret = assign_proto_idx(prot);
if (ret) {
mutex_unlock(&proto_list_mutex);
goto out_free_timewait_sock_slab;
}
list_add(&prot->node, &proto_list);
mutex_unlock(&proto_list_mutex);
return ret;
out_free_timewait_sock_slab:
if (alloc_slab)
tw_prot_cleanup(prot->twsk_prot);
out_free_request_sock_slab:
if (alloc_slab) {
req_prot_cleanup(prot->rsk_prot);
kmem_cache_destroy(prot->slab);
prot->slab = NULL;
}
out:
return ret;
}
EXPORT_SYMBOL(proto_register);
void proto_unregister(struct proto *prot)
{
mutex_lock(&proto_list_mutex);
release_proto_idx(prot);
list_del(&prot->node);
mutex_unlock(&proto_list_mutex);
kmem_cache_destroy(prot->slab);
prot->slab = NULL;
req_prot_cleanup(prot->rsk_prot);
tw_prot_cleanup(prot->twsk_prot);
}
EXPORT_SYMBOL(proto_unregister);
int sock_load_diag_module(int family, int protocol)
{
if (!protocol) {
if (!sock_is_registered(family))
return -ENOENT;
return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
NETLINK_SOCK_DIAG, family);
}
#ifdef CONFIG_INET
if (family == AF_INET &&
protocol != IPPROTO_RAW &&
protocol < MAX_INET_PROTOS &&
!rcu_access_pointer(inet_protos[protocol]))
return -ENOENT;
#endif
return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
NETLINK_SOCK_DIAG, family, protocol);
}
EXPORT_SYMBOL(sock_load_diag_module);
#ifdef CONFIG_PROC_FS
static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(proto_list_mutex)
{
mutex_lock(&proto_list_mutex);
return seq_list_start_head(&proto_list, *pos);
}
static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
return seq_list_next(v, &proto_list, pos);
}
static void proto_seq_stop(struct seq_file *seq, void *v)
__releases(proto_list_mutex)
{
mutex_unlock(&proto_list_mutex);
}
static char proto_method_implemented(const void *method)
{
return method == NULL ? 'n' : 'y';
}
static long sock_prot_memory_allocated(struct proto *proto)
{
return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
}
static const char *sock_prot_memory_pressure(struct proto *proto)
{
return proto->memory_pressure != NULL ?
proto_memory_pressure(proto) ? "yes" : "no" : "NI";
}
static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
{
seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
"%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
proto->name,
proto->obj_size,
sock_prot_inuse_get(seq_file_net(seq), proto),
sock_prot_memory_allocated(proto),
sock_prot_memory_pressure(proto),
proto->max_header,
proto->slab == NULL ? "no" : "yes",
module_name(proto->owner),
proto_method_implemented(proto->close),
proto_method_implemented(proto->connect),
proto_method_implemented(proto->disconnect),
proto_method_implemented(proto->accept),
proto_method_implemented(proto->ioctl),
proto_method_implemented(proto->init),
proto_method_implemented(proto->destroy),
proto_method_implemented(proto->shutdown),
proto_method_implemented(proto->setsockopt),
proto_method_implemented(proto->getsockopt),
proto_method_implemented(proto->sendmsg),
proto_method_implemented(proto->recvmsg),
proto_method_implemented(proto->bind),
proto_method_implemented(proto->backlog_rcv),
proto_method_implemented(proto->hash),
proto_method_implemented(proto->unhash),
proto_method_implemented(proto->get_port),
proto_method_implemented(proto->enter_memory_pressure));
}
static int proto_seq_show(struct seq_file *seq, void *v)
{
if (v == &proto_list)
seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
"protocol",
"size",
"sockets",
"memory",
"press",
"maxhdr",
"slab",
"module",
"cl co di ac io in de sh ss gs se re bi br ha uh gp em\n");
else
proto_seq_printf(seq, list_entry(v, struct proto, node));
return 0;
}
static const struct seq_operations proto_seq_ops = {
.start = proto_seq_start,
.next = proto_seq_next,
.stop = proto_seq_stop,
.show = proto_seq_show,
};
static __net_init int proto_init_net(struct net *net)
{
if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops,
sizeof(struct seq_net_private)))
return -ENOMEM;
return 0;
}
static __net_exit void proto_exit_net(struct net *net)
{
remove_proc_entry("protocols", net->proc_net);
}
static __net_initdata struct pernet_operations proto_net_ops = {
.init = proto_init_net,
.exit = proto_exit_net,
};
static int __init proto_init(void)
{
return register_pernet_subsys(&proto_net_ops);
}
subsys_initcall(proto_init);
#endif /* PROC_FS */
#ifdef CONFIG_NET_RX_BUSY_POLL
bool sk_busy_loop_end(void *p, unsigned long start_time)
{
struct sock *sk = p;
if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
return true;
if (sk_is_udp(sk) &&
!skb_queue_empty_lockless(&udp_sk(sk)->reader_queue))
return true;
return sk_busy_loop_timeout(sk, start_time);
}
EXPORT_SYMBOL(sk_busy_loop_end);
#endif /* CONFIG_NET_RX_BUSY_POLL */
int sock_bind_add(struct sock *sk, struct sockaddr *addr, int addr_len)
{
if (!sk->sk_prot->bind_add)
return -EOPNOTSUPP;
return sk->sk_prot->bind_add(sk, addr, addr_len);
}
EXPORT_SYMBOL(sock_bind_add);
/* Copy 'size' bytes from userspace and return `size` back to userspace */
int sock_ioctl_inout(struct sock *sk, unsigned int cmd,
void __user *arg, void *karg, size_t size)
{
int ret;
if (copy_from_user(karg, arg, size))
return -EFAULT;
ret = READ_ONCE(sk->sk_prot)->ioctl(sk, cmd, karg);
if (ret)
return ret;
if (copy_to_user(arg, karg, size))
return -EFAULT;
return 0;
}
EXPORT_SYMBOL(sock_ioctl_inout);
/* This is the most common ioctl prep function, where the result (4 bytes) is
* copied back to userspace if the ioctl() returns successfully. No input is
* copied from userspace as input argument.
*/
static int sock_ioctl_out(struct sock *sk, unsigned int cmd, void __user *arg)
{
int ret, karg = 0;
ret = READ_ONCE(sk->sk_prot)->ioctl(sk, cmd, &karg);
if (ret)
return ret;
return put_user(karg, (int __user *)arg);
}
/* A wrapper around sock ioctls, which copies the data from userspace
* (depending on the protocol/ioctl), and copies back the result to userspace.
* The main motivation for this function is to pass kernel memory to the
* protocol ioctl callbacks, instead of userspace memory.
*/
int sk_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
{
int rc = 1;
if (sk->sk_type == SOCK_RAW && sk->sk_family == AF_INET)
rc = ipmr_sk_ioctl(sk, cmd, arg);
else if (sk->sk_type == SOCK_RAW && sk->sk_family == AF_INET6)
rc = ip6mr_sk_ioctl(sk, cmd, arg);
else if (sk_is_phonet(sk))
rc = phonet_sk_ioctl(sk, cmd, arg);
/* If ioctl was processed, returns its value */
if (rc <= 0)
return rc;
/* Otherwise call the default handler */
return sock_ioctl_out(sk, cmd, arg);
}
EXPORT_SYMBOL(sk_ioctl);
static int __init sock_struct_check(void)
{
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rx, sk_drops);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rx, sk_peek_off);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rx, sk_error_queue);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rx, sk_receive_queue);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rx, sk_backlog);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_rx_dst);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_rx_dst_ifindex);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_rx_dst_cookie);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_rcvbuf);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_filter);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_wq);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_data_ready);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_rcvtimeo);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rx, sk_rcvlowat);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rxtx, sk_err);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rxtx, sk_socket);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_rxtx, sk_memcg);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rxtx, sk_lock);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rxtx, sk_reserved_mem);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rxtx, sk_forward_alloc);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_rxtx, sk_tsflags);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_omem_alloc);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_omem_alloc);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_sndbuf);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_wmem_queued);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_wmem_alloc);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_tsq_flags);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_send_head);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_write_queue);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_write_pending);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_dst_pending_confirm);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_pacing_status);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_frag);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_timer);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_pacing_rate);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_zckey);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_write_tx, sk_tskey);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_max_pacing_rate);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_sndtimeo);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_priority);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_mark);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_dst_cache);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_route_caps);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_gso_type);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_gso_max_size);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_allocation);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_txhash);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_gso_max_segs);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_pacing_shift);
CACHELINE_ASSERT_GROUP_MEMBER(struct sock, sock_read_tx, sk_use_task_frag);
return 0;
}
core_initcall(sock_struct_check);
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