#include <linux/kernel.h>
#include <linux/list.h>
+#include <linux/list_nulls.h>
#include <linux/timer.h>
#include <linux/cache.h>
#include <linux/module.h>
#include <linux/skbuff.h> /* struct sk_buff */
#include <linux/mm.h>
#include <linux/security.h>
+#include <linux/slab.h>
#include <linux/filter.h>
+#include <linux/rculist_nulls.h>
+#include <linux/poll.h>
#include <asm/atomic.h>
#include <net/dst.h>
printk(KERN_DEBUG msg); } while (0)
#else
/* Validate arguments and do nothing */
-static void inline int __attribute__ ((format (printf, 2, 3)))
+static inline void __attribute__ ((format (printf, 2, 3)))
SOCK_DEBUG(struct sock *sk, const char *msg, ...)
{
}
/**
* struct sock_common - minimal network layer representation of sockets
+ * @skc_node: main hash linkage for various protocol lookup tables
+ * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol
+ * @skc_refcnt: reference count
+ * @skc_tx_queue_mapping: tx queue number for this connection
+ * @skc_hash: hash value used with various protocol lookup tables
+ * @skc_u16hashes: two u16 hash values used by UDP lookup tables
* @skc_family: network address family
* @skc_state: Connection state
* @skc_reuse: %SO_REUSEADDR setting
* @skc_bound_dev_if: bound device index if != 0
- * @skc_node: main hash linkage for various protocol lookup tables
* @skc_bind_node: bind hash linkage for various protocol lookup tables
- * @skc_refcnt: reference count
- * @skc_hash: hash value used with various protocol lookup tables
+ * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol
* @skc_prot: protocol handlers inside a network family
* @skc_net: reference to the network namespace of this socket
*
* for struct sock and struct inet_timewait_sock.
*/
struct sock_common {
+ /*
+ * first fields are not copied in sock_copy()
+ */
+ union {
+ struct hlist_node skc_node;
+ struct hlist_nulls_node skc_nulls_node;
+ };
+ atomic_t skc_refcnt;
+ int skc_tx_queue_mapping;
+
+ union {
+ unsigned int skc_hash;
+ __u16 skc_u16hashes[2];
+ };
unsigned short skc_family;
volatile unsigned char skc_state;
unsigned char skc_reuse;
int skc_bound_dev_if;
- struct hlist_node skc_node;
- struct hlist_node skc_bind_node;
- atomic_t skc_refcnt;
- unsigned int skc_hash;
+ union {
+ struct hlist_node skc_bind_node;
+ struct hlist_nulls_node skc_portaddr_node;
+ };
struct proto *skc_prot;
#ifdef CONFIG_NET_NS
struct net *skc_net;
* @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings
* @sk_lock: synchronizer
* @sk_rcvbuf: size of receive buffer in bytes
- * @sk_sleep: sock wait queue
+ * @sk_wq: sock wait queue and async head
* @sk_dst_cache: destination cache
* @sk_dst_lock: destination cache lock
* @sk_policy: flow policy
* @sk_allocation: allocation mode
* @sk_sndbuf: size of send buffer in bytes
* @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE,
- * %SO_OOBINLINE settings
+ * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings
* @sk_no_check: %SO_NO_CHECK setting, wether or not checkup packets
* @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO)
+ * @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK)
* @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4)
* @sk_gso_max_size: Maximum GSO segment size to build
* @sk_lingertime: %SO_LINGER l_linger setting
* @sk_rcvlowat: %SO_RCVLOWAT setting
* @sk_rcvtimeo: %SO_RCVTIMEO setting
* @sk_sndtimeo: %SO_SNDTIMEO setting
+ * @sk_rxhash: flow hash received from netif layer
* @sk_filter: socket filtering instructions
* @sk_protinfo: private area, net family specific, when not using slab
* @sk_timer: sock cleanup timer
* don't add nothing before this first member (__sk_common) --acme
*/
struct sock_common __sk_common;
+#define sk_node __sk_common.skc_node
+#define sk_nulls_node __sk_common.skc_nulls_node
+#define sk_refcnt __sk_common.skc_refcnt
+#define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping
+
+#define sk_copy_start __sk_common.skc_hash
+#define sk_hash __sk_common.skc_hash
#define sk_family __sk_common.skc_family
#define sk_state __sk_common.skc_state
#define sk_reuse __sk_common.skc_reuse
#define sk_bound_dev_if __sk_common.skc_bound_dev_if
-#define sk_node __sk_common.skc_node
#define sk_bind_node __sk_common.skc_bind_node
-#define sk_refcnt __sk_common.skc_refcnt
-#define sk_hash __sk_common.skc_hash
#define sk_prot __sk_common.skc_prot
#define sk_net __sk_common.skc_net
- unsigned char sk_shutdown : 2,
- sk_no_check : 2,
- sk_userlocks : 4;
- unsigned char sk_protocol;
- unsigned short sk_type;
+ kmemcheck_bitfield_begin(flags);
+ unsigned int sk_shutdown : 2,
+ sk_no_check : 2,
+ sk_userlocks : 4,
+ sk_protocol : 8,
+ sk_type : 16;
+ kmemcheck_bitfield_end(flags);
int sk_rcvbuf;
socket_lock_t sk_lock;
/*
struct {
struct sk_buff *head;
struct sk_buff *tail;
+ int len;
} sk_backlog;
- wait_queue_head_t *sk_sleep;
+ struct socket_wq *sk_wq;
struct dst_entry *sk_dst_cache;
+#ifdef CONFIG_XFRM
struct xfrm_policy *sk_policy[2];
- rwlock_t sk_dst_lock;
+#endif
+ spinlock_t sk_dst_lock;
atomic_t sk_rmem_alloc;
atomic_t sk_wmem_alloc;
atomic_t sk_omem_alloc;
int sk_sndbuf;
struct sk_buff_head sk_receive_queue;
struct sk_buff_head sk_write_queue;
+#ifdef CONFIG_NET_DMA
struct sk_buff_head sk_async_wait_queue;
+#endif
int sk_wmem_queued;
int sk_forward_alloc;
gfp_t sk_allocation;
int sk_route_caps;
+ int sk_route_nocaps;
int sk_gso_type;
unsigned int sk_gso_max_size;
int sk_rcvlowat;
+#ifdef CONFIG_RPS
+ __u32 sk_rxhash;
+#endif
unsigned long sk_flags;
unsigned long sk_lingertime;
struct sk_buff_head sk_error_queue;
struct sk_buff *sk_send_head;
__u32 sk_sndmsg_off;
int sk_write_pending;
+#ifdef CONFIG_SECURITY
void *sk_security;
+#endif
__u32 sk_mark;
/* XXX 4 bytes hole on 64 bit */
void (*sk_state_change)(struct sock *sk);
/*
* Hashed lists helper routines
*/
+static inline struct sock *sk_entry(const struct hlist_node *node)
+{
+ return hlist_entry(node, struct sock, sk_node);
+}
+
static inline struct sock *__sk_head(const struct hlist_head *head)
{
return hlist_entry(head->first, struct sock, sk_node);
return hlist_empty(head) ? NULL : __sk_head(head);
}
+static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head)
+{
+ return hlist_nulls_entry(head->first, struct sock, sk_nulls_node);
+}
+
+static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head)
+{
+ return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head);
+}
+
static inline struct sock *sk_next(const struct sock *sk)
{
return sk->sk_node.next ?
hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL;
}
+static inline struct sock *sk_nulls_next(const struct sock *sk)
+{
+ return (!is_a_nulls(sk->sk_nulls_node.next)) ?
+ hlist_nulls_entry(sk->sk_nulls_node.next,
+ struct sock, sk_nulls_node) :
+ NULL;
+}
+
static inline int sk_unhashed(const struct sock *sk)
{
return hlist_unhashed(&sk->sk_node);
node->pprev = NULL;
}
+static __inline__ void sk_nulls_node_init(struct hlist_nulls_node *node)
+{
+ node->pprev = NULL;
+}
+
static __inline__ void __sk_del_node(struct sock *sk)
{
__hlist_del(&sk->sk_node);
}
+/* NB: equivalent to hlist_del_init_rcu */
static __inline__ int __sk_del_node_init(struct sock *sk)
{
if (sk_hashed(sk)) {
}
return rc;
}
+#define sk_del_node_init_rcu(sk) sk_del_node_init(sk)
+
+static __inline__ int __sk_nulls_del_node_init_rcu(struct sock *sk)
+{
+ if (sk_hashed(sk)) {
+ hlist_nulls_del_init_rcu(&sk->sk_nulls_node);
+ return 1;
+ }
+ return 0;
+}
+
+static __inline__ int sk_nulls_del_node_init_rcu(struct sock *sk)
+{
+ int rc = __sk_nulls_del_node_init_rcu(sk);
+
+ if (rc) {
+ /* paranoid for a while -acme */
+ WARN_ON(atomic_read(&sk->sk_refcnt) == 1);
+ __sock_put(sk);
+ }
+ return rc;
+}
static __inline__ void __sk_add_node(struct sock *sk, struct hlist_head *list)
{
__sk_add_node(sk, list);
}
+static __inline__ void sk_add_node_rcu(struct sock *sk, struct hlist_head *list)
+{
+ sock_hold(sk);
+ hlist_add_head_rcu(&sk->sk_node, list);
+}
+
+static __inline__ void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list)
+{
+ hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list);
+}
+
+static __inline__ void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list)
+{
+ sock_hold(sk);
+ __sk_nulls_add_node_rcu(sk, list);
+}
+
static __inline__ void __sk_del_bind_node(struct sock *sk)
{
__hlist_del(&sk->sk_bind_node);
#define sk_for_each(__sk, node, list) \
hlist_for_each_entry(__sk, node, list, sk_node)
+#define sk_for_each_rcu(__sk, node, list) \
+ hlist_for_each_entry_rcu(__sk, node, list, sk_node)
+#define sk_nulls_for_each(__sk, node, list) \
+ hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node)
+#define sk_nulls_for_each_rcu(__sk, node, list) \
+ hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node)
#define sk_for_each_from(__sk, node) \
if (__sk && ({ node = &(__sk)->sk_node; 1; })) \
hlist_for_each_entry_from(__sk, node, sk_node)
+#define sk_nulls_for_each_from(__sk, node) \
+ if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \
+ hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node)
#define sk_for_each_continue(__sk, node) \
if (__sk && ({ node = &(__sk)->sk_node; 1; })) \
hlist_for_each_entry_continue(__sk, node, sk_node)
SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */
SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */
SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */
+ SOCK_TIMESTAMPING_TX_HARDWARE, /* %SOF_TIMESTAMPING_TX_HARDWARE */
+ SOCK_TIMESTAMPING_TX_SOFTWARE, /* %SOF_TIMESTAMPING_TX_SOFTWARE */
+ SOCK_TIMESTAMPING_RX_HARDWARE, /* %SOF_TIMESTAMPING_RX_HARDWARE */
+ SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */
+ SOCK_TIMESTAMPING_SOFTWARE, /* %SOF_TIMESTAMPING_SOFTWARE */
+ SOCK_TIMESTAMPING_RAW_HARDWARE, /* %SOF_TIMESTAMPING_RAW_HARDWARE */
+ SOCK_TIMESTAMPING_SYS_HARDWARE, /* %SOF_TIMESTAMPING_SYS_HARDWARE */
+ SOCK_FASYNC, /* fasync() active */
+ SOCK_RXQ_OVFL,
};
static inline void sock_copy_flags(struct sock *nsk, struct sock *osk)
return sk->sk_wmem_queued < sk->sk_sndbuf;
}
-/* The per-socket spinlock must be held here. */
-static inline void sk_add_backlog(struct sock *sk, struct sk_buff *skb)
+/* OOB backlog add */
+static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb)
{
if (!sk->sk_backlog.tail) {
sk->sk_backlog.head = sk->sk_backlog.tail = skb;
skb->next = NULL;
}
+/*
+ * Take into account size of receive queue and backlog queue
+ */
+static inline bool sk_rcvqueues_full(const struct sock *sk, const struct sk_buff *skb)
+{
+ unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc);
+
+ return qsize + skb->truesize > sk->sk_rcvbuf;
+}
+
+/* The per-socket spinlock must be held here. */
+static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb)
+{
+ if (sk_rcvqueues_full(sk, skb))
+ return -ENOBUFS;
+
+ __sk_add_backlog(sk, skb);
+ sk->sk_backlog.len += skb->truesize;
+ return 0;
+}
+
+static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
+{
+ return sk->sk_backlog_rcv(sk, skb);
+}
+
+static inline void sock_rps_record_flow(const struct sock *sk)
+{
+#ifdef CONFIG_RPS
+ struct rps_sock_flow_table *sock_flow_table;
+
+ rcu_read_lock();
+ sock_flow_table = rcu_dereference(rps_sock_flow_table);
+ rps_record_sock_flow(sock_flow_table, sk->sk_rxhash);
+ rcu_read_unlock();
+#endif
+}
+
+static inline void sock_rps_reset_flow(const struct sock *sk)
+{
+#ifdef CONFIG_RPS
+ struct rps_sock_flow_table *sock_flow_table;
+
+ rcu_read_lock();
+ sock_flow_table = rcu_dereference(rps_sock_flow_table);
+ rps_reset_sock_flow(sock_flow_table, sk->sk_rxhash);
+ rcu_read_unlock();
+#endif
+}
+
+static inline void sock_rps_save_rxhash(struct sock *sk, u32 rxhash)
+{
+#ifdef CONFIG_RPS
+ if (unlikely(sk->sk_rxhash != rxhash)) {
+ sock_rps_reset_flow(sk);
+ sk->sk_rxhash = rxhash;
+ }
+#endif
+}
+
#define sk_wait_event(__sk, __timeo, __condition) \
({ int __rc; \
release_sock(__sk); \
void (*shutdown)(struct sock *sk, int how);
int (*setsockopt)(struct sock *sk, int level,
int optname, char __user *optval,
- int optlen);
+ unsigned int optlen);
int (*getsockopt)(struct sock *sk, int level,
int optname, char __user *optval,
int __user *option);
+#ifdef CONFIG_COMPAT
int (*compat_setsockopt)(struct sock *sk,
int level,
int optname, char __user *optval,
- int optlen);
+ unsigned int optlen);
int (*compat_getsockopt)(struct sock *sk,
int level,
int optname, char __user *optval,
int __user *option);
+#endif
int (*sendmsg)(struct kiocb *iocb, struct sock *sk,
struct msghdr *msg, size_t len);
int (*recvmsg)(struct kiocb *iocb, struct sock *sk,
/* Memory pressure */
void (*enter_memory_pressure)(struct sock *sk);
atomic_t *memory_allocated; /* Current allocated memory. */
- atomic_t *sockets_allocated; /* Current number of sockets. */
+ struct percpu_counter *sockets_allocated; /* Current number of sockets. */
/*
* Pressure flag: try to collapse.
* Technical note: it is used by multiple contexts non atomically.
int *sysctl_rmem;
int max_header;
- struct kmem_cache *slab;
+ struct kmem_cache *slab;
unsigned int obj_size;
+ int slab_flags;
- atomic_t *orphan_count;
+ struct percpu_counter *orphan_count;
struct request_sock_ops *rsk_prot;
struct timewait_sock_ops *twsk_prot;
union {
struct inet_hashinfo *hashinfo;
- struct hlist_head *udp_hash;
+ struct udp_table *udp_table;
struct raw_hashinfo *raw_hash;
} h;
static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb)
{
- skb_truesize_check(skb);
sock_set_flag(sk, SOCK_QUEUE_SHRUNK);
sk->sk_wmem_queued -= skb->truesize;
sk_mem_uncharge(sk, skb->truesize);
*/
#define sock_lock_init_class_and_name(sk, sname, skey, name, key) \
do { \
- sk->sk_lock.owned = 0; \
+ sk->sk_lock.owned = 0; \
init_waitqueue_head(&sk->sk_lock.wq); \
spin_lock_init(&(sk)->sk_lock.slock); \
debug_check_no_locks_freed((void *)&(sk)->sk_lock, \
SINGLE_DEPTH_NESTING)
#define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock))
+static inline void lock_sock_bh(struct sock *sk)
+{
+ spin_lock_bh(&sk->sk_lock.slock);
+}
+
+static inline void unlock_sock_bh(struct sock *sk)
+{
+ spin_unlock_bh(&sk->sk_lock.slock);
+}
+
extern struct sock *sk_alloc(struct net *net, int family,
gfp_t priority,
struct proto *prot);
extern int sock_setsockopt(struct socket *sock, int level,
int op, char __user *optval,
- int optlen);
+ unsigned int optlen);
extern int sock_getsockopt(struct socket *sock, int level,
int op, char __user *optval,
unsigned long size,
int noblock,
int *errcode);
+extern struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
+ unsigned long header_len,
+ unsigned long data_len,
+ int noblock,
+ int *errcode);
extern void *sock_kmalloc(struct sock *sk, int size,
gfp_t priority);
extern void sock_kfree_s(struct sock *sk, void *mem, int size);
extern int sock_no_getsockopt(struct socket *, int , int,
char __user *, int __user *);
extern int sock_no_setsockopt(struct socket *, int, int,
- char __user *, int);
+ char __user *, unsigned int);
extern int sock_no_sendmsg(struct kiocb *, struct socket *,
struct msghdr *, size_t);
extern int sock_no_recvmsg(struct kiocb *, struct socket *,
extern int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t size, int flags);
extern int sock_common_setsockopt(struct socket *sock, int level, int optname,
- char __user *optval, int optlen);
+ char __user *optval, unsigned int optlen);
extern int compat_sock_common_getsockopt(struct socket *sock, int level,
int optname, char __user *optval, int __user *optlen);
extern int compat_sock_common_setsockopt(struct socket *sock, int level,
- int optname, char __user *optval, int optlen);
+ int optname, char __user *optval, unsigned int optlen);
extern void sk_common_release(struct sock *sk);
extern void sock_init_data(struct socket *sock, struct sock *sk);
/**
- * sk_filter_release: Release a socket filter
- * @sk: socket
+ * sk_filter_release - release a socket filter
* @fp: filter to remove
*
* Remove a filter from a socket and release its resources.
extern int sk_receive_skb(struct sock *sk, struct sk_buff *skb,
const int nested);
+static inline void sk_tx_queue_set(struct sock *sk, int tx_queue)
+{
+ sk->sk_tx_queue_mapping = tx_queue;
+}
+
+static inline void sk_tx_queue_clear(struct sock *sk)
+{
+ sk->sk_tx_queue_mapping = -1;
+}
+
+static inline int sk_tx_queue_get(const struct sock *sk)
+{
+ return sk->sk_tx_queue_mapping;
+}
+
+static inline bool sk_tx_queue_recorded(const struct sock *sk)
+{
+ return (sk && sk->sk_tx_queue_mapping >= 0);
+}
+
static inline void sk_set_socket(struct sock *sk, struct socket *sock)
{
+ sk_tx_queue_clear(sk);
sk->sk_socket = sock;
}
+static inline wait_queue_head_t *sk_sleep(struct sock *sk)
+{
+ return &sk->sk_wq->wait;
+}
/* Detach socket from process context.
* Announce socket dead, detach it from wait queue and inode.
* Note that parent inode held reference count on this struct sock,
write_lock_bh(&sk->sk_callback_lock);
sock_set_flag(sk, SOCK_DEAD);
sk_set_socket(sk, NULL);
- sk->sk_sleep = NULL;
+ sk->sk_wq = NULL;
write_unlock_bh(&sk->sk_callback_lock);
}
static inline void sock_graft(struct sock *sk, struct socket *parent)
{
write_lock_bh(&sk->sk_callback_lock);
- sk->sk_sleep = &parent->wait;
+ rcu_assign_pointer(sk->sk_wq, parent->wq);
parent->sk = sk;
sk_set_socket(sk, parent);
security_sock_graft(sk, parent);
static inline struct dst_entry *
__sk_dst_get(struct sock *sk)
{
- return sk->sk_dst_cache;
+ return rcu_dereference_check(sk->sk_dst_cache, rcu_read_lock_held() ||
+ sock_owned_by_user(sk) ||
+ lockdep_is_held(&sk->sk_lock.slock));
}
static inline struct dst_entry *
{
struct dst_entry *dst;
- read_lock(&sk->sk_dst_lock);
- dst = sk->sk_dst_cache;
+ rcu_read_lock();
+ dst = rcu_dereference(sk->sk_dst_cache);
if (dst)
dst_hold(dst);
- read_unlock(&sk->sk_dst_lock);
+ rcu_read_unlock();
return dst;
}
+extern void sk_reset_txq(struct sock *sk);
+
+static inline void dst_negative_advice(struct sock *sk)
+{
+ struct dst_entry *ndst, *dst = __sk_dst_get(sk);
+
+ if (dst && dst->ops->negative_advice) {
+ ndst = dst->ops->negative_advice(dst);
+
+ if (ndst != dst) {
+ rcu_assign_pointer(sk->sk_dst_cache, ndst);
+ sk_reset_txq(sk);
+ }
+ }
+}
+
static inline void
__sk_dst_set(struct sock *sk, struct dst_entry *dst)
{
struct dst_entry *old_dst;
- old_dst = sk->sk_dst_cache;
- sk->sk_dst_cache = dst;
+ sk_tx_queue_clear(sk);
+ /*
+ * This can be called while sk is owned by the caller only,
+ * with no state that can be checked in a rcu_dereference_check() cond
+ */
+ old_dst = rcu_dereference_raw(sk->sk_dst_cache);
+ rcu_assign_pointer(sk->sk_dst_cache, dst);
dst_release(old_dst);
}
static inline void
sk_dst_set(struct sock *sk, struct dst_entry *dst)
{
- write_lock(&sk->sk_dst_lock);
+ spin_lock(&sk->sk_dst_lock);
__sk_dst_set(sk, dst);
- write_unlock(&sk->sk_dst_lock);
+ spin_unlock(&sk->sk_dst_lock);
}
static inline void
__sk_dst_reset(struct sock *sk)
{
- struct dst_entry *old_dst;
-
- old_dst = sk->sk_dst_cache;
- sk->sk_dst_cache = NULL;
- dst_release(old_dst);
+ __sk_dst_set(sk, NULL);
}
static inline void
sk_dst_reset(struct sock *sk)
{
- write_lock(&sk->sk_dst_lock);
+ spin_lock(&sk->sk_dst_lock);
__sk_dst_reset(sk);
- write_unlock(&sk->sk_dst_lock);
+ spin_unlock(&sk->sk_dst_lock);
}
extern struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie);
extern void sk_setup_caps(struct sock *sk, struct dst_entry *dst);
+static inline void sk_nocaps_add(struct sock *sk, int flags)
+{
+ sk->sk_route_nocaps |= flags;
+ sk->sk_route_caps &= ~flags;
+}
+
static inline int skb_copy_to_page(struct sock *sk, char __user *from,
struct sk_buff *skb, struct page *page,
int off, int copy)
return 0;
}
+/**
+ * sk_wmem_alloc_get - returns write allocations
+ * @sk: socket
+ *
+ * Returns sk_wmem_alloc minus initial offset of one
+ */
+static inline int sk_wmem_alloc_get(const struct sock *sk)
+{
+ return atomic_read(&sk->sk_wmem_alloc) - 1;
+}
+
+/**
+ * sk_rmem_alloc_get - returns read allocations
+ * @sk: socket
+ *
+ * Returns sk_rmem_alloc
+ */
+static inline int sk_rmem_alloc_get(const struct sock *sk)
+{
+ return atomic_read(&sk->sk_rmem_alloc);
+}
+
+/**
+ * sk_has_allocations - check if allocations are outstanding
+ * @sk: socket
+ *
+ * Returns true if socket has write or read allocations
+ */
+static inline int sk_has_allocations(const struct sock *sk)
+{
+ return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk);
+}
+
+/**
+ * wq_has_sleeper - check if there are any waiting processes
+ * @sk: struct socket_wq
+ *
+ * Returns true if socket_wq has waiting processes
+ *
+ * The purpose of the wq_has_sleeper and sock_poll_wait is to wrap the memory
+ * barrier call. They were added due to the race found within the tcp code.
+ *
+ * Consider following tcp code paths:
+ *
+ * CPU1 CPU2
+ *
+ * sys_select receive packet
+ * ... ...
+ * __add_wait_queue update tp->rcv_nxt
+ * ... ...
+ * tp->rcv_nxt check sock_def_readable
+ * ... {
+ * schedule rcu_read_lock();
+ * wq = rcu_dereference(sk->sk_wq);
+ * if (wq && waitqueue_active(&wq->wait))
+ * wake_up_interruptible(&wq->wait)
+ * ...
+ * }
+ *
+ * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay
+ * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1
+ * could then endup calling schedule and sleep forever if there are no more
+ * data on the socket.
+ *
+ */
+static inline bool wq_has_sleeper(struct socket_wq *wq)
+{
+
+ /*
+ * We need to be sure we are in sync with the
+ * add_wait_queue modifications to the wait queue.
+ *
+ * This memory barrier is paired in the sock_poll_wait.
+ */
+ smp_mb();
+ return wq && waitqueue_active(&wq->wait);
+}
+
+/**
+ * sock_poll_wait - place memory barrier behind the poll_wait call.
+ * @filp: file
+ * @wait_address: socket wait queue
+ * @p: poll_table
+ *
+ * See the comments in the wq_has_sleeper function.
+ */
+static inline void sock_poll_wait(struct file *filp,
+ wait_queue_head_t *wait_address, poll_table *p)
+{
+ if (p && wait_address) {
+ poll_wait(filp, wait_address, p);
+ /*
+ * We need to be sure we are in sync with the
+ * socket flags modification.
+ *
+ * This memory barrier is paired in the wq_has_sleeper.
+ */
+ smp_mb();
+ }
+}
+
/*
* Queue a received datagram if it will fit. Stream and sequenced
* protocols can't normally use this as they need to fit buffers in
static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
{
- sock_hold(sk);
+ skb_orphan(skb);
skb->sk = sk;
skb->destructor = sock_wfree;
+ /*
+ * We used to take a refcount on sk, but following operation
+ * is enough to guarantee sk_free() wont free this sock until
+ * all in-flight packets are completed
+ */
atomic_add(skb->truesize, &sk->sk_wmem_alloc);
}
static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
{
+ skb_orphan(skb);
skb->sk = sk;
skb->destructor = sock_rfree;
atomic_add(skb->truesize, &sk->sk_rmem_alloc);
static inline void sk_wake_async(struct sock *sk, int how, int band)
{
- if (sk->sk_socket && sk->sk_socket->fasync_list)
+ if (sock_flag(sk, SOCK_FASYNC))
sock_wake_async(sk->sk_socket, how, band);
}
static inline gfp_t gfp_any(void)
{
- return in_atomic() ? GFP_ATOMIC : GFP_KERNEL;
+ return in_softirq() ? GFP_ATOMIC : GFP_KERNEL;
}
static inline long sock_rcvtimeo(const struct sock *sk, int noblock)
sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb)
{
ktime_t kt = skb->tstamp;
+ struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb);
- if (sock_flag(sk, SOCK_RCVTSTAMP))
+ /*
+ * generate control messages if
+ * - receive time stamping in software requested (SOCK_RCVTSTAMP
+ * or SOCK_TIMESTAMPING_RX_SOFTWARE)
+ * - software time stamp available and wanted
+ * (SOCK_TIMESTAMPING_SOFTWARE)
+ * - hardware time stamps available and wanted
+ * (SOCK_TIMESTAMPING_SYS_HARDWARE or
+ * SOCK_TIMESTAMPING_RAW_HARDWARE)
+ */
+ if (sock_flag(sk, SOCK_RCVTSTAMP) ||
+ sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE) ||
+ (kt.tv64 && sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) ||
+ (hwtstamps->hwtstamp.tv64 &&
+ sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) ||
+ (hwtstamps->syststamp.tv64 &&
+ sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)))
__sock_recv_timestamp(msg, sk, skb);
else
sk->sk_stamp = kt;
}
+extern void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
+ struct sk_buff *skb);
+
+static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
+ struct sk_buff *skb)
+{
+#define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \
+ (1UL << SOCK_RCVTSTAMP) | \
+ (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
+ (1UL << SOCK_TIMESTAMPING_SOFTWARE) | \
+ (1UL << SOCK_TIMESTAMPING_RAW_HARDWARE) | \
+ (1UL << SOCK_TIMESTAMPING_SYS_HARDWARE))
+
+ if (sk->sk_flags & FLAGS_TS_OR_DROPS)
+ __sock_recv_ts_and_drops(msg, sk, skb);
+ else
+ sk->sk_stamp = skb->tstamp;
+}
+
+/**
+ * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped
+ * @msg: outgoing packet
+ * @sk: socket sending this packet
+ * @shtx: filled with instructions for time stamping
+ *
+ * Currently only depends on SOCK_TIMESTAMPING* flags. Returns error code if
+ * parameters are invalid.
+ */
+extern int sock_tx_timestamp(struct msghdr *msg,
+ struct sock *sk,
+ union skb_shared_tx *shtx);
+
+
/**
* sk_eat_skb - Release a skb if it is no longer needed
* @sk: socket to eat this skb from
sock_net_set(sk, hold_net(net));
}
-extern void sock_enable_timestamp(struct sock *sk);
+static inline struct sock *skb_steal_sock(struct sk_buff *skb)
+{
+ if (unlikely(skb->sk)) {
+ struct sock *sk = skb->sk;
+
+ skb->destructor = NULL;
+ skb->sk = NULL;
+ return sk;
+ }
+ return NULL;
+}
+
+extern void sock_enable_timestamp(struct sock *sk, int flag);
extern int sock_get_timestamp(struct sock *, struct timeval __user *);
extern int sock_get_timestampns(struct sock *, struct timespec __user *);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff