linux-stable/include/net/transp_v6.h
Paolo Abeni 6c206b2009 udp: fix rx queue len reported by diag and proc interface
After commit 6b229cf77d ("udp: add batching to udp_rmem_release()")
the sk_rmem_alloc field does not measure exactly anymore the
receive queue length, because we batch the rmem release. The issue
is really apparent only after commit 0d4a6608f6 ("udp: do rmem bulk
free even if the rx sk queue is empty"): the user space can easily
check for an empty socket with not-0 queue length reported by the 'ss'
tool or the procfs interface.

We need to use a custom UDP helper to report the correct queue length,
taking into account the forward allocation deficit.

Reported-by: trevor.francis@46labs.com
Fixes: 6b229cf77d ("UDP: add batching to udp_rmem_release()")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-06-08 19:55:15 -04:00

72 lines
2.1 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _TRANSP_V6_H
#define _TRANSP_V6_H
#include <net/checksum.h>
/* IPv6 transport protocols */
extern struct proto rawv6_prot;
extern struct proto udpv6_prot;
extern struct proto udplitev6_prot;
extern struct proto tcpv6_prot;
extern struct proto pingv6_prot;
struct flowi6;
/* extension headers */
int ipv6_exthdrs_init(void);
void ipv6_exthdrs_exit(void);
int ipv6_frag_init(void);
void ipv6_frag_exit(void);
/* transport protocols */
int pingv6_init(void);
void pingv6_exit(void);
int rawv6_init(void);
void rawv6_exit(void);
int udpv6_init(void);
void udpv6_exit(void);
int udplitev6_init(void);
void udplitev6_exit(void);
int tcpv6_init(void);
void tcpv6_exit(void);
int udpv6_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
/* this does all the common and the specific ctl work */
void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
struct sk_buff *skb);
void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
struct sk_buff *skb);
void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
struct sk_buff *skb);
int ip6_datagram_send_ctl(struct net *net, struct sock *sk, struct msghdr *msg,
struct flowi6 *fl6, struct ipcm6_cookie *ipc6,
struct sockcm_cookie *sockc);
void __ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
__u16 srcp, __u16 destp, int rqueue, int bucket);
static inline void
ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, __u16 srcp,
__u16 destp, int bucket)
{
__ip6_dgram_sock_seq_show(seq, sp, srcp, destp, sk_rmem_alloc_get(sp),
bucket);
}
#define LOOPBACK4_IPV6 cpu_to_be32(0x7f000006)
/* address family specific functions */
extern const struct inet_connection_sock_af_ops ipv4_specific;
void inet6_destroy_sock(struct sock *sk);
#define IPV6_SEQ_DGRAM_HEADER \
" sl " \
"local_address " \
"remote_address " \
"st tx_queue rx_queue tr tm->when retrnsmt" \
" uid timeout inode ref pointer drops\n"
#endif