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Diffstat (limited to 'include/net/udp.h')
| -rw-r--r-- | include/net/udp.h | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/include/net/udp.h b/include/net/udp.h new file mode 100644 index 00000000..5d606d9d --- /dev/null +++ b/include/net/udp.h @@ -0,0 +1,270 @@ +/* + * 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_nulls_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; +extern void udp_table_init(struct udp_table *, const char *); +static inline struct udp_hslot *udp_hashslot(struct udp_table *table, + struct net *net, unsigned num) +{ + return &table->hash[udp_hashfn(net, num, table->mask)]; +} +/* + * 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]; +} + +/* Note: this must match 'valbool' in sock_setsockopt */ +#define UDP_CSUM_NOXMIT 1 + +/* Used by SunRPC/xprt layer. */ +#define UDP_CSUM_NORCV 2 + +/* Default, as per the RFC, is to always do csums. */ +#define UDP_CSUM_DEFAULT 0 + +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 __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov); +} + +static inline int udp_lib_checksum_complete(struct sk_buff *skb) +{ + return !skb_csum_unnecessary(skb) && + __udp_lib_checksum_complete(skb); +} + +/** + * 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; +} + +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; +} + +/* hash routines shared between UDPv4/6 and UDP-Litev4/6 */ +static inline void udp_lib_hash(struct sock *sk) +{ + BUG(); +} + +extern void udp_lib_unhash(struct sock *sk); +extern 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); +} + +extern int udp_lib_get_port(struct sock *sk, unsigned short snum, + int (*)(const struct sock *,const struct sock *), + unsigned int hash2_nulladdr); + +/* net/ipv4/udp.c */ +extern int udp_get_port(struct sock *sk, unsigned short snum, + int (*saddr_cmp)(const struct sock *, + const struct sock *)); +extern void udp_err(struct sk_buff *, u32); +extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk, + struct msghdr *msg, size_t len); +extern void udp_flush_pending_frames(struct sock *sk); +extern int udp_rcv(struct sk_buff *skb); +extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg); +extern int udp_disconnect(struct sock *sk, int flags); +extern unsigned int udp_poll(struct file *file, struct socket *sock, + poll_table *wait); +extern int udp_lib_getsockopt(struct sock *sk, int level, int optname, + char __user *optval, int __user *optlen); +extern int udp_lib_setsockopt(struct sock *sk, int level, int optname, + char __user *optval, unsigned int optlen, + int (*push_pending_frames)(struct sock *)); +extern struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, + __be32 daddr, __be16 dport, + int dif); +extern struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, + __be32 daddr, __be16 dport, + int dif, struct udp_table *tbl); +extern struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, + const struct in6_addr *daddr, __be16 dport, + int dif); +extern 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); + +/* + * SNMP statistics for UDP and UDP-Lite + */ +#define UDP_INC_STATS_USER(net, field, is_udplite) do { \ + if (is_udplite) SNMP_INC_STATS_USER((net)->mib.udplite_statistics, field); \ + else SNMP_INC_STATS_USER((net)->mib.udp_statistics, field); } while(0) +#define UDP_INC_STATS_BH(net, field, is_udplite) do { \ + if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_statistics, field); \ + else SNMP_INC_STATS_BH((net)->mib.udp_statistics, field); } while(0) + +#define UDP6_INC_STATS_BH(net, field, is_udplite) do { \ + if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_stats_in6, field);\ + else SNMP_INC_STATS_BH((net)->mib.udp_stats_in6, field); \ +} while(0) +#define UDP6_INC_STATS_USER(net, field, __lite) do { \ + if (__lite) SNMP_INC_STATS_USER((net)->mib.udplite_stats_in6, field); \ + else SNMP_INC_STATS_USER((net)->mib.udp_stats_in6, field); \ +} while(0) + +#if IS_ENABLED(CONFIG_IPV6) +#define UDPX_INC_STATS_BH(sk, field) \ + do { \ + if ((sk)->sk_family == AF_INET) \ + UDP_INC_STATS_BH(sock_net(sk), field, 0); \ + else \ + UDP6_INC_STATS_BH(sock_net(sk), field, 0); \ + } while (0); +#else +#define UDPX_INC_STATS_BH(sk, field) UDP_INC_STATS_BH(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 +extern int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo); +extern void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo); + +extern int udp4_proc_init(void); +extern void udp4_proc_exit(void); +#endif + +extern void udp_init(void); + +extern int udp4_ufo_send_check(struct sk_buff *skb); +extern struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb, + netdev_features_t features); +#endif /* _UDP_H */ |