Release 4.12 include/net/udp.h
/*
* 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 module.
*
* Version: @(#)udp.h 1.0.2 05/07/93
*
* Authors: Ross Biro
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
*
* Fixes:
* Alan Cox : Turned on udp checksums. I don't want to
* chase 'memory corruption' bugs that aren't!
*
* 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 _UDP_H
#define _UDP_H
#include <linux/list.h>
#include <linux/bug.h>
#include <net/inet_sock.h>
#include <net/sock.h>
#include <net/snmp.h>
#include <net/ip.h>
#include <linux/ipv6.h>
#include <linux/seq_file.h>
#include <linux/poll.h>
/**
* struct udp_skb_cb - UDP(-Lite) private variables
*
* @header: private variables used by IPv4/IPv6
* @cscov: checksum coverage length (UDP-Lite only)
* @partial_cov: if set indicates partial csum coverage
*/
struct udp_skb_cb {
union {
struct inet_skb_parm h4;
#if IS_ENABLED(CONFIG_IPV6)
struct inet6_skb_parm h6;
#endif
} header;
__u16 cscov;
__u8 partial_cov;
};
#define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb))
/**
* struct udp_hslot - UDP hash slot
*
* @head: head of list of sockets
* @count: number of sockets in 'head' list
* @lock: spinlock protecting changes to head/count
*/
struct udp_hslot {
struct hlist_head head;
int count;
spinlock_t lock;
} __attribute__((aligned(2 * sizeof(long))));
/**
* struct udp_table - UDP table
*
* @hash: hash table, sockets are hashed on (local port)
* @hash2: hash table, sockets are hashed on (local port, local address)
* @mask: number of slots in hash tables, minus 1
* @log: log2(number of slots in hash table)
*/
struct udp_table {
struct udp_hslot *hash;
struct udp_hslot *hash2;
unsigned int mask;
unsigned int log;
};
extern struct udp_table udp_table;
void udp_table_init(struct udp_table *, const char *);
static inline struct udp_hslot *udp_hashslot(struct udp_table *table,
struct net *net, unsigned int num)
{
return &table->hash[udp_hashfn(net, num, table->mask)];
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Dumazet | 41 | 100.00% | 2 | 100.00% |
| Total | 41 | 100.00% | 2 | 100.00% |
/*
* For secondary hash, net_hash_mix() is performed before calling
* udp_hashslot2(), this explains difference with udp_hashslot()
*/
static inline struct udp_hslot *udp_hashslot2(struct udp_table *table,
unsigned int hash)
{
return &table->hash2[hash & table->mask];
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Eric Dumazet | 31 | 100.00% | 1 | 100.00% |
| Total | 31 | 100.00% | 1 | 100.00% |
extern struct proto udp_prot;
extern atomic_long_t udp_memory_allocated;
/* sysctl variables for udp */
extern long sysctl_udp_mem[3];
extern int sysctl_udp_rmem_min;
extern int sysctl_udp_wmem_min;
struct sk_buff;
/*
* Generic checksumming routines for UDP(-Lite) v4 and v6
*/
static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb)
{
return (UDP_SKB_CB(skb)->cscov == skb->len ?
__skb_checksum_complete(skb) :
__skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov));
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Gerrit Renker | 23 | 53.49% | 1 | 25.00% |
| Tom Herbert | 18 | 41.86% | 1 | 25.00% |
| Al Viro | 1 | 2.33% | 1 | 25.00% |
| Herbert Xu | 1 | 2.33% | 1 | 25.00% |
| Total | 43 | 100.00% | 4 | 100.00% |
static inline int udp_lib_checksum_complete(struct sk_buff *skb)
{
return !skb_csum_unnecessary(skb) &&
__udp_lib_checksum_complete(skb);
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Gerrit Renker | 18 | 75.00% | 1 | 25.00% |
| Herbert Xu | 4 | 16.67% | 1 | 25.00% |
| Al Viro | 2 | 8.33% | 2 | 50.00% |
| Total | 24 | 100.00% | 4 | 100.00% |
/**
* udp_csum_outgoing - compute UDPv4/v6 checksum over fragments
* @sk: socket we are writing to
* @skb: sk_buff containing the filled-in UDP header
* (checksum field must be zeroed out)
*/
static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb)
{
__wsum csum = csum_partial(skb_transport_header(skb),
sizeof(struct udphdr), 0);
skb_queue_walk(&sk->sk_write_queue, skb) {
csum = csum_add(csum, skb->csum);
}
return csum;
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Gerrit Renker | 53 | 91.38% | 1 | 33.33% |
| Arnaldo Carvalho de Melo | 3 | 5.17% | 1 | 33.33% |
| Al Viro | 2 | 3.45% | 1 | 33.33% |
| Total | 58 | 100.00% | 3 | 100.00% |
static inline __wsum udp_csum(struct sk_buff *skb)
{
__wsum csum = csum_partial(skb_transport_header(skb),
sizeof(struct udphdr), skb->csum);
for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next) {
csum = csum_add(csum, skb->csum);
}
return csum;
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Herbert Xu | 68 | 100.00% | 1 | 100.00% |
| Total | 68 | 100.00% | 1 | 100.00% |
static inline __sum16 udp_v4_check(int len, __be32 saddr,
__be32 daddr, __wsum base)
{
return csum_tcpudp_magic(saddr, daddr, len, IPPROTO_UDP, base);
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Tom Herbert | 33 | 100.00% | 1 | 100.00% |
| Total | 33 | 100.00% | 1 | 100.00% |
void udp_set_csum(bool nocheck, struct sk_buff *skb,
__be32 saddr, __be32 daddr, int len);
static inline void udp_csum_pull_header(struct sk_buff *skb)
{
if (!skb->csum_valid && skb->ip_summed == CHECKSUM_NONE)
skb->csum = csum_partial(skb->data, sizeof(struct udphdr),
skb->csum);
skb_pull_rcsum(skb, sizeof(struct udphdr));
UDP_SKB_CB(skb)->cscov -= sizeof(struct udphdr);
}
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| samanthakumar | 63 | 90.00% | 1 | 50.00% |
| Eric Dumazet | 7 | 10.00% | 1 | 50.00% |
| Total | 70 | 100.00% | 2 | 100.00% |
typedef struct sock *(*udp_lookup_t)(struct sk_buff *skb, __be16 sport,
__be16 dport);
struct sk_buff **udp_gro_receive(struct sk_buff **head, struct sk_buff *skb,
struct udphdr *uh, udp_lookup_t lookup);
int udp_gro_complete(struct sk_buff *skb, int nhoff, udp_lookup_t lookup);
static inline struct udphdr *udp_gro_udphdr(struct sk_buff *skb)
{
struct udphdr *uh;
unsigned int hlen, off;
off = skb_gro_offset(skb);
hlen = off + sizeof(*uh);
uh = skb_gro_header_fast(skb, off);
if (skb_gro_header_hard(skb, hlen))
uh = skb_gro_header_slow(skb, hlen, off);
return uh;
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Tom Herbert | 74 | 100.00% | 1 | 100.00% |
| Total | 74 | 100.00% | 1 | 100.00% |
/* hash routines shared between UDPv4/6 and UDP-Litev4/6 */
static inline int udp_lib_hash(struct sock *sk)
{
BUG();
return 0;
}
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| Gerrit Renker | 14 | 77.78% | 1 | 50.00% |
| Craig Gallek | 4 | 22.22% | 1 | 50.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
void udp_lib_unhash(struct sock *sk);
void udp_lib_rehash(struct sock *sk, u16 new_hash);
static inline void udp_lib_close(struct sock *sk, long timeout)
{
sk_common_release(sk);
}
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| Gerrit Renker | 20 | 100.00% | 1 | 100.00% |
| Total | 20 | 100.00% | 1 | 100.00% |
int udp_lib_get_port(struct sock *sk, unsigned short snum,
unsigned int hash2_nulladdr);
u32 udp_flow_hashrnd(void);
static inline __be16 udp_flow_src_port(struct net *net, struct sk_buff *skb,
int min, int max, bool use_eth)
{
u32 hash;
if (min >= max) {
/* Use default range */
inet_get_local_port_range(net, &min, &max);
}
hash = skb_get_hash(skb);
if (unlikely(!hash)) {
if (use_eth) {
/* Can't find a normal hash, caller has indicated an
* Ethernet packet so use that to compute a hash.
*/
hash = jhash(skb->data, 2 * ETH_ALEN,
(__force u32) skb->protocol);
} else {
/* Can't derive any sort of hash for the packet, set
* to some consistent random value.
*/
hash = udp_flow_hashrnd();
}
}
/* Since this is being sent on the wire obfuscate hash a bit
* to minimize possbility that any useful information to an
* attacker is leaked. Only upper 16 bits are relevant in the
* computation for 16 bit port value.
*/
hash ^= hash << 16;
return htons((((u64) hash * (max - min)) >> 32) + min);
}
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| Tom Herbert | 133 | 100.00% | 2 | 100.00% |
| Total | 133 | 100.00% | 2 | 100.00% |
/* net/ipv4/udp.c */
void udp_destruct_sock(struct sock *sk);
void skb_consume_udp(struct sock *sk, struct sk_buff *skb, int len);
int __udp_enqueue_schedule_skb(struct sock *sk, struct sk_buff *skb);
void udp_skb_destructor(struct sock *sk, struct sk_buff *skb);
static inline struct sk_buff *
__skb_recv_udp(struct sock *sk, unsigned int flags, int noblock, int *peeked,
int *off, int *err)
{
return __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
udp_skb_destructor, peeked, off, err);
}
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| Paolo Abeni | 57 | 100.00% | 1 | 100.00% |
| Total | 57 | 100.00% | 1 | 100.00% |
static inline struct sk_buff *skb_recv_udp(struct sock *sk, unsigned int flags,
int noblock, int *err)
{
int peeked, off = 0;
return __skb_recv_udp(sk, flags, noblock, &peeked, &off, err);
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Paolo Abeni | 50 | 100.00% | 1 | 100.00% |
| Total | 50 | 100.00% | 1 | 100.00% |
void udp_v4_early_demux(struct sk_buff *skb);
int udp_get_port(struct sock *sk, unsigned short snum,
int (*saddr_cmp)(const struct sock *,
const struct sock *));
void udp_err(struct sk_buff *, u32);
int udp_abort(struct sock *sk, int err);
int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len);
int udp_push_pending_frames(struct sock *sk);
void udp_flush_pending_frames(struct sock *sk);
void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst);
int udp_rcv(struct sk_buff *skb);
int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
int udp_init_sock(struct sock *sk);
int __udp_disconnect(struct sock *sk, int flags);
int udp_disconnect(struct sock *sk, int flags);
unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait);
struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
netdev_features_t features,
bool is_ipv6);
int udp_lib_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen);
int udp_lib_setsockopt(struct sock *sk, int level, int optname,
char __user *optval, unsigned int optlen,
int (*push_pending_frames)(struct sock *));
struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
__be32 daddr, __be16 dport, int dif);
struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
__be32 daddr, __be16 dport, int dif,
struct udp_table *tbl, struct sk_buff *skb);
struct sock *udp4_lib_lookup_skb(struct sk_buff *skb,
__be16 sport, __be16 dport);
struct sock *udp6_lib_lookup(struct net *net,
const struct in6_addr *saddr, __be16 sport,
const struct in6_addr *daddr, __be16 dport,
int dif);
struct sock *__udp6_lib_lookup(struct net *net,
const struct in6_addr *saddr, __be16 sport,
const struct in6_addr *daddr, __be16 dport,
int dif, struct udp_table *tbl,
struct sk_buff *skb);
struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
__be16 sport, __be16 dport);
/*
* SNMP statistics for UDP and UDP-Lite
*/
#define UDP_INC_STATS(net, field, is_udplite) do { \
if (is_udplite) SNMP_INC_STATS((net)->mib.udplite_statistics, field); \
else SNMP_INC_STATS((net)->mib.udp_statistics, field); } while(0)
#define __UDP_INC_STATS(net, field, is_udplite) do { \
if (is_udplite) __SNMP_INC_STATS((net)->mib.udplite_statistics, field); \
else __SNMP_INC_STATS((net)->mib.udp_statistics, field); } while(0)
#define __UDP6_INC_STATS(net, field, is_udplite) do { \
if (is_udplite) __SNMP_INC_STATS((net)->mib.udplite_stats_in6, field);\
else __SNMP_INC_STATS((net)->mib.udp_stats_in6, field); \
} while(0)
#define UDP6_INC_STATS(net, field, __lite) do { \
if (__lite) SNMP_INC_STATS((net)->mib.udplite_stats_in6, field); \
else SNMP_INC_STATS((net)->mib.udp_stats_in6, field); \
} while(0)
#if IS_ENABLED(CONFIG_IPV6)
#define __UDPX_INC_STATS(sk, field) \
do { \
if ((sk)->sk_family == AF_INET) \
__UDP_INC_STATS(sock_net(sk), field, 0); \
else \
__UDP6_INC_STATS(sock_net(sk), field, 0); \
} while (0)
#else
#define __UDPX_INC_STATS(sk, field) __UDP_INC_STATS(sock_net(sk), field, 0)
#endif
/* /proc */
int udp_seq_open(struct inode *inode, struct file *file);
struct udp_seq_afinfo {
char *name;
sa_family_t family;
struct udp_table *udp_table;
const struct file_operations *seq_fops;
struct seq_operations seq_ops;
};
struct udp_iter_state {
struct seq_net_private p;
sa_family_t family;
int bucket;
struct udp_table *udp_table;
};
#ifdef CONFIG_PROC_FS
int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo);
void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo);
int udp4_proc_init(void);
void udp4_proc_exit(void);
#endif
int udpv4_offload_init(void);
void udp_init(void);
void udp_encap_enable(void);
#if IS_ENABLED(CONFIG_IPV6)
void udpv6_encap_enable(void);
#endif
#endif /* _UDP_H */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Tom Herbert | 384 | 22.20% | 8 | 8.89% |
| Gerrit Renker | 254 | 14.68% | 3 | 3.33% |
| Eric Dumazet | 200 | 11.56% | 16 | 17.78% |
| Paolo Abeni | 170 | 9.83% | 3 | 3.33% |
| Herbert Xu | 110 | 6.36% | 4 | 4.44% |
| Linus Torvalds (pre-git) | 95 | 5.49% | 9 | 10.00% |
| Pavel Emelyanov | 90 | 5.20% | 6 | 6.67% |
| samanthakumar | 63 | 3.64% | 1 | 1.11% |
| Hideaki Yoshifuji / 吉藤英明 | 46 | 2.66% | 1 | 1.11% |
| David S. Miller | 33 | 1.91% | 5 | 5.56% |
| Balazs Scheidler | 32 | 1.85% | 1 | 1.11% |
| Arnaldo Carvalho de Melo | 27 | 1.56% | 4 | 4.44% |
| KOVACS Krisztian | 26 | 1.50% | 1 | 1.11% |
| Stephen Hemminger | 20 | 1.16% | 2 | 2.22% |
| Daniel Borkmann | 19 | 1.10% | 1 | 1.11% |
| Hideo Aoki | 18 | 1.04% | 1 | 1.11% |
| Arjan van de Ven | 16 | 0.92% | 1 | 1.11% |
| Denis V. Lunev | 16 | 0.92% | 4 | 4.44% |
| Thomas Graf | 15 | 0.87% | 1 | 1.11% |
| Craig Gallek | 14 | 0.81% | 2 | 2.22% |
| Benjamin LaHaise | 14 | 0.81% | 1 | 1.11% |
| Daniel Lezcano | 12 | 0.69% | 2 | 2.22% |
| David Ahern | 12 | 0.69% | 1 | 1.11% |
| Shawn Bohrer | 9 | 0.52% | 1 | 1.11% |
| Hannes Frederic Sowa | 9 | 0.52% | 1 | 1.11% |
| Al Viro | 8 | 0.46% | 4 | 4.44% |
| Sridhar Samudrala | 7 | 0.40% | 1 | 1.11% |
| Richard Kennedy | 3 | 0.17% | 1 | 1.11% |
| Paul Gortmaker | 3 | 0.17% | 1 | 1.11% |
| Ravikiran G. Thirumalai | 3 | 0.17% | 1 | 1.11% |
| Linus Torvalds | 1 | 0.06% | 1 | 1.11% |
| Jesper Juhl | 1 | 0.06% | 1 | 1.11% |
| Total | 1730 | 100.00% | 90 | 100.00% |
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