mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 21:54:06 +08:00
44046a593e
Users of udp encapsulation currently have an encap_rcv callback which they can use to hook into the udp receive path. In situations where a encapsulation user allocates resources associated with a udp encap socket, it may be convenient to be able to also hook the proto .destroy operation. For example, if an encap user holds a reference to the udp socket, the destroy hook might be used to relinquish this reference. This patch adds a socket destroy hook into udp, which is set and enabled in the same way as the existing encap_rcv hook. Signed-off-by: Tom Parkin <tparkin@katalix.com> Signed-off-by: James Chapman <jchapman@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* Definitions for the UDP protocol.
|
|
*
|
|
* Version: @(#)udp.h 1.0.2 04/28/93
|
|
*
|
|
* Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
#ifndef _LINUX_UDP_H
|
|
#define _LINUX_UDP_H
|
|
|
|
#include <net/inet_sock.h>
|
|
#include <linux/skbuff.h>
|
|
#include <net/netns/hash.h>
|
|
#include <uapi/linux/udp.h>
|
|
|
|
static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
|
|
{
|
|
return (struct udphdr *)skb_transport_header(skb);
|
|
}
|
|
|
|
static inline struct udphdr *inner_udp_hdr(const struct sk_buff *skb)
|
|
{
|
|
return (struct udphdr *)skb_inner_transport_header(skb);
|
|
}
|
|
|
|
#define UDP_HTABLE_SIZE_MIN (CONFIG_BASE_SMALL ? 128 : 256)
|
|
|
|
static inline int udp_hashfn(struct net *net, unsigned num, unsigned mask)
|
|
{
|
|
return (num + net_hash_mix(net)) & mask;
|
|
}
|
|
|
|
struct udp_sock {
|
|
/* inet_sock has to be the first member */
|
|
struct inet_sock inet;
|
|
#define udp_port_hash inet.sk.__sk_common.skc_u16hashes[0]
|
|
#define udp_portaddr_hash inet.sk.__sk_common.skc_u16hashes[1]
|
|
#define udp_portaddr_node inet.sk.__sk_common.skc_portaddr_node
|
|
int pending; /* Any pending frames ? */
|
|
unsigned int corkflag; /* Cork is required */
|
|
__u16 encap_type; /* Is this an Encapsulation socket? */
|
|
/*
|
|
* Following member retains the information to create a UDP header
|
|
* when the socket is uncorked.
|
|
*/
|
|
__u16 len; /* total length of pending frames */
|
|
/*
|
|
* Fields specific to UDP-Lite.
|
|
*/
|
|
__u16 pcslen;
|
|
__u16 pcrlen;
|
|
/* indicator bits used by pcflag: */
|
|
#define UDPLITE_BIT 0x1 /* set by udplite proto init function */
|
|
#define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */
|
|
#define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */
|
|
__u8 pcflag; /* marks socket as UDP-Lite if > 0 */
|
|
__u8 unused[3];
|
|
/*
|
|
* For encapsulation sockets.
|
|
*/
|
|
int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
|
|
void (*encap_destroy)(struct sock *sk);
|
|
};
|
|
|
|
static inline struct udp_sock *udp_sk(const struct sock *sk)
|
|
{
|
|
return (struct udp_sock *)sk;
|
|
}
|
|
|
|
#define udp_portaddr_for_each_entry(__sk, node, list) \
|
|
hlist_nulls_for_each_entry(__sk, node, list, __sk_common.skc_portaddr_node)
|
|
|
|
#define udp_portaddr_for_each_entry_rcu(__sk, node, list) \
|
|
hlist_nulls_for_each_entry_rcu(__sk, node, list, __sk_common.skc_portaddr_node)
|
|
|
|
#define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)
|
|
|
|
#endif /* _LINUX_UDP_H */
|