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345 lines
10 KiB
345 lines
10 KiB
/* |
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* INET An implementation of the TCP/IP protocol suite for the LINUX |
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* operating system. INET is implemented using the BSD Socket |
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* interface as the means of communication with the user level. |
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* |
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* Definitions for the UDP module. |
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* |
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* Version: @(#)udp.h 1.0.2 05/07/93 |
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* |
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* Authors: Ross Biro |
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
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* |
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* Fixes: |
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* Alan Cox : Turned on udp checksums. I don't want to |
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* chase 'memory corruption' bugs that aren't! |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version |
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* 2 of the License, or (at your option) any later version. |
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*/ |
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#ifndef _UDP_H |
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#define _UDP_H |
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#include <linux/list.h> |
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#include <linux/bug.h> |
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#include <net/inet_sock.h> |
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#include <net/sock.h> |
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#include <net/snmp.h> |
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#include <net/ip.h> |
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#include <linux/ipv6.h> |
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#include <linux/seq_file.h> |
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#include <linux/poll.h> |
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/** |
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* struct udp_skb_cb - UDP(-Lite) private variables |
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* |
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* @header: private variables used by IPv4/IPv6 |
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* @cscov: checksum coverage length (UDP-Lite only) |
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* @partial_cov: if set indicates partial csum coverage |
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*/ |
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struct udp_skb_cb { |
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union { |
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struct inet_skb_parm h4; |
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#if IS_ENABLED(CONFIG_IPV6) |
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struct inet6_skb_parm h6; |
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#endif |
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} header; |
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__u16 cscov; |
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__u8 partial_cov; |
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}; |
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#define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb)) |
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/** |
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* struct udp_hslot - UDP hash slot |
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* |
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* @head: head of list of sockets |
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* @count: number of sockets in 'head' list |
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* @lock: spinlock protecting changes to head/count |
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*/ |
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struct udp_hslot { |
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struct hlist_nulls_head head; |
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int count; |
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spinlock_t lock; |
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} __attribute__((aligned(2 * sizeof(long)))); |
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/** |
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* struct udp_table - UDP table |
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* |
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* @hash: hash table, sockets are hashed on (local port) |
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* @hash2: hash table, sockets are hashed on (local port, local address) |
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* @mask: number of slots in hash tables, minus 1 |
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* @log: log2(number of slots in hash table) |
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*/ |
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struct udp_table { |
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struct udp_hslot *hash; |
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struct udp_hslot *hash2; |
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unsigned int mask; |
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unsigned int log; |
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}; |
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extern struct udp_table udp_table; |
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void udp_table_init(struct udp_table *, const char *); |
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static inline struct udp_hslot *udp_hashslot(struct udp_table *table, |
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struct net *net, unsigned int num) |
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{ |
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return &table->hash[udp_hashfn(net, num, table->mask)]; |
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} |
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/* |
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* For secondary hash, net_hash_mix() is performed before calling |
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* udp_hashslot2(), this explains difference with udp_hashslot() |
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*/ |
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static inline struct udp_hslot *udp_hashslot2(struct udp_table *table, |
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unsigned int hash) |
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{ |
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return &table->hash2[hash & table->mask]; |
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} |
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extern struct proto udp_prot; |
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extern atomic_long_t udp_memory_allocated; |
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/* sysctl variables for udp */ |
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extern long sysctl_udp_mem[3]; |
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extern int sysctl_udp_rmem_min; |
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extern int sysctl_udp_wmem_min; |
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struct sk_buff; |
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#define UDP_SKT_WIFI |
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#ifdef UDP_SKT_WIFI |
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extern int sysctl_met_is_enable; |
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extern int sysctl_udp_met_port; |
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extern void udp_event_trace_printk(const char *fmt, int pid, __u16 port); |
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#define MET_SOCKET_LATENCY_NAME "SKT-WIFI" |
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#endif |
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/* |
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* Generic checksumming routines for UDP(-Lite) v4 and v6 |
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*/ |
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static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb) |
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{ |
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return (UDP_SKB_CB(skb)->cscov == skb->len ? |
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__skb_checksum_complete(skb) : |
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__skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov)); |
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} |
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static inline int udp_lib_checksum_complete(struct sk_buff *skb) |
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{ |
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return !skb_csum_unnecessary(skb) && |
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__udp_lib_checksum_complete(skb); |
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} |
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/** |
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* udp_csum_outgoing - compute UDPv4/v6 checksum over fragments |
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* @sk: socket we are writing to |
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* @skb: sk_buff containing the filled-in UDP header |
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* (checksum field must be zeroed out) |
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*/ |
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static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb) |
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{ |
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__wsum csum = csum_partial(skb_transport_header(skb), |
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sizeof(struct udphdr), 0); |
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skb_queue_walk(&sk->sk_write_queue, skb) { |
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csum = csum_add(csum, skb->csum); |
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} |
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return csum; |
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} |
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static inline __wsum udp_csum(struct sk_buff *skb) |
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{ |
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__wsum csum = csum_partial(skb_transport_header(skb), |
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sizeof(struct udphdr), skb->csum); |
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for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next) { |
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csum = csum_add(csum, skb->csum); |
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} |
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return csum; |
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} |
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static inline __sum16 udp_v4_check(int len, __be32 saddr, |
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__be32 daddr, __wsum base) |
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{ |
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return csum_tcpudp_magic(saddr, daddr, len, IPPROTO_UDP, base); |
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} |
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void udp_set_csum(bool nocheck, struct sk_buff *skb, |
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__be32 saddr, __be32 daddr, int len); |
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struct sk_buff **udp_gro_receive(struct sk_buff **head, struct sk_buff *skb, |
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struct udphdr *uh); |
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int udp_gro_complete(struct sk_buff *skb, int nhoff); |
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static inline struct udphdr *udp_gro_udphdr(struct sk_buff *skb) |
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{ |
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struct udphdr *uh; |
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unsigned int hlen, off; |
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off = skb_gro_offset(skb); |
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hlen = off + sizeof(*uh); |
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uh = skb_gro_header_fast(skb, off); |
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if (skb_gro_header_hard(skb, hlen)) |
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uh = skb_gro_header_slow(skb, hlen, off); |
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return uh; |
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} |
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/* hash routines shared between UDPv4/6 and UDP-Litev4/6 */ |
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static inline void udp_lib_hash(struct sock *sk) |
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{ |
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BUG(); |
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} |
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void udp_lib_unhash(struct sock *sk); |
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void udp_lib_rehash(struct sock *sk, u16 new_hash); |
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static inline void udp_lib_close(struct sock *sk, long timeout) |
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{ |
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sk_common_release(sk); |
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} |
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int udp_lib_get_port(struct sock *sk, unsigned short snum, |
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int (*)(const struct sock *, const struct sock *), |
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unsigned int hash2_nulladdr); |
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u32 udp_flow_hashrnd(void); |
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static inline __be16 udp_flow_src_port(struct net *net, struct sk_buff *skb, |
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int min, int max, bool use_eth) |
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{ |
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u32 hash; |
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if (min >= max) { |
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/* Use default range */ |
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inet_get_local_port_range(net, &min, &max); |
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} |
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hash = skb_get_hash(skb); |
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if (unlikely(!hash)) { |
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if (use_eth) { |
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/* Can't find a normal hash, caller has indicated an |
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* Ethernet packet so use that to compute a hash. |
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*/ |
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hash = jhash(skb->data, 2 * ETH_ALEN, |
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(__force u32) skb->protocol); |
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} else { |
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/* Can't derive any sort of hash for the packet, set |
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* to some consistent random value. |
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*/ |
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hash = udp_flow_hashrnd(); |
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} |
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} |
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/* Since this is being sent on the wire obfuscate hash a bit |
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* to minimize possbility that any useful information to an |
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* attacker is leaked. Only upper 16 bits are relevant in the |
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* computation for 16 bit port value. |
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*/ |
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hash ^= hash << 16; |
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return htons((((u64) hash * (max - min)) >> 32) + min); |
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} |
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/* net/ipv4/udp.c */ |
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void udp_v4_early_demux(struct sk_buff *skb); |
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int udp_get_port(struct sock *sk, unsigned short snum, |
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int (*saddr_cmp)(const struct sock *, |
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const struct sock *)); |
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void udp_err(struct sk_buff *, u32); |
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int udp_abort(struct sock *sk, int err); |
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int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len); |
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int udp_push_pending_frames(struct sock *sk); |
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void udp_flush_pending_frames(struct sock *sk); |
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void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst); |
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int udp_rcv(struct sk_buff *skb); |
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int udp_ioctl(struct sock *sk, int cmd, unsigned long arg); |
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int udp_disconnect(struct sock *sk, int flags); |
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unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait); |
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struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb, |
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netdev_features_t features, |
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bool is_ipv6); |
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int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
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char __user *optval, int __user *optlen); |
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int udp_lib_setsockopt(struct sock *sk, int level, int optname, |
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char __user *optval, unsigned int optlen, |
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int (*push_pending_frames)(struct sock *)); |
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struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, |
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__be32 daddr, __be16 dport, int dif); |
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struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, |
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__be32 daddr, __be16 dport, int dif, |
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struct udp_table *tbl); |
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struct sock *udp6_lib_lookup(struct net *net, |
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const struct in6_addr *saddr, __be16 sport, |
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const struct in6_addr *daddr, __be16 dport, |
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int dif); |
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struct sock *__udp6_lib_lookup(struct net *net, |
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const struct in6_addr *saddr, __be16 sport, |
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const struct in6_addr *daddr, __be16 dport, |
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int dif, struct udp_table *tbl); |
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/* |
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* SNMP statistics for UDP and UDP-Lite |
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*/ |
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#define UDP_INC_STATS_USER(net, field, is_udplite) do { \ |
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if (is_udplite) SNMP_INC_STATS_USER((net)->mib.udplite_statistics, field); \ |
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else SNMP_INC_STATS_USER((net)->mib.udp_statistics, field); } while(0) |
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#define UDP_INC_STATS_BH(net, field, is_udplite) do { \ |
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if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_statistics, field); \ |
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else SNMP_INC_STATS_BH((net)->mib.udp_statistics, field); } while(0) |
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#define UDP6_INC_STATS_BH(net, field, is_udplite) do { \ |
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if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_stats_in6, field);\ |
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else SNMP_INC_STATS_BH((net)->mib.udp_stats_in6, field); \ |
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} while(0) |
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#define UDP6_INC_STATS_USER(net, field, __lite) do { \ |
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if (__lite) SNMP_INC_STATS_USER((net)->mib.udplite_stats_in6, field); \ |
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else SNMP_INC_STATS_USER((net)->mib.udp_stats_in6, field); \ |
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} while(0) |
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#if IS_ENABLED(CONFIG_IPV6) |
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#define UDPX_INC_STATS_BH(sk, field) \ |
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do { \ |
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if ((sk)->sk_family == AF_INET) \ |
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UDP_INC_STATS_BH(sock_net(sk), field, 0); \ |
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else \ |
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UDP6_INC_STATS_BH(sock_net(sk), field, 0); \ |
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} while (0) |
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#else |
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#define UDPX_INC_STATS_BH(sk, field) UDP_INC_STATS_BH(sock_net(sk), field, 0) |
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#endif |
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/* /proc */ |
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int udp_seq_open(struct inode *inode, struct file *file); |
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struct udp_seq_afinfo { |
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char *name; |
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sa_family_t family; |
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struct udp_table *udp_table; |
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const struct file_operations *seq_fops; |
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struct seq_operations seq_ops; |
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}; |
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struct udp_iter_state { |
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struct seq_net_private p; |
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sa_family_t family; |
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int bucket; |
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struct udp_table *udp_table; |
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}; |
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#ifdef CONFIG_PROC_FS |
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int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo); |
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void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo); |
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int udp4_proc_init(void); |
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void udp4_proc_exit(void); |
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#endif |
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int udpv4_offload_init(void); |
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void udp_init(void); |
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void udp_encap_enable(void); |
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#if IS_ENABLED(CONFIG_IPV6) |
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void udpv6_encap_enable(void); |
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#endif |
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#endif /* _UDP_H */
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