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6lowpan.h
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act_api.h
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addrconf.h
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af_ieee802154.h
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arp.h
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cfg80211.h
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cfg802154.h
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checksum.h
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cipso_ipv4.h
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cls_cgroup.h
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codel.h
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compat.h
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datalink.h
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dst.h
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esp.h
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firewire.h
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icmp.h
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ieee80211_radiotap.h
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ieee802154_netdev.h
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if_inet6.h
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inet6_connection_sock.h
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inet6_hashtables.h
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inet_common.h
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inet_connection_sock.h
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inet_ecn.h
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inet_frag.h
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inet_hashtables.h
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inet_sock.h
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inet_timewait_sock.h
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inetpeer.h
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ip.h
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ip6_checksum.h
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ip6_fib.h
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ip6_route.h
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ip6_tunnel.h
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ip_fib.h
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ip_tunnels.h
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ip_vs.h
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ipcomp.h
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ipconfig.h
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ipv6.h
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ipx.h
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iw_handler.h
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l3mdev.h
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lapb.h
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lib80211.h
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llc.h
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mac80211.h
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mac802154.h
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mip6.h
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mld.h
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mpls.h
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mrp.h
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ndisc.h
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neighbour.h
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net_namespace.h
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net_ratelimit.h
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netlabel.h
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netlink.h
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netprio_cgroup.h
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nexthop.h
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nl802154.h
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p8022.h
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ping.h
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pkt_cls.h
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pkt_sched.h
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protocol.h
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psnap.h
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raw.h
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red.h
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regulatory.h
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request_sock.h
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route.h
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rtnetlink.h
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snmp.h
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sock.h
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stp.h
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switchdev.h
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tcp.h
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tcp_memcontrol.h
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tcp_states.h
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timewait_sock.h
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tso.h
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udp.h
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udp_tunnel.h
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udplite.h
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vsock_addr.h
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wext.h
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wimax.h
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x25.h
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x25device.h
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xfrm.h
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Save
Rename
/* * 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; 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)]; } /* * 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]; } 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)); } 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; } static inline __sum16 udp_v4_check(int len, __be32 saddr, __be32 daddr, __wsum base) { return csum_tcpudp_magic(saddr, daddr, len, IPPROTO_UDP, base); } void udp_set_csum(bool nocheck, struct sk_buff *skb, __be32 saddr, __be32 daddr, int len); struct sk_buff **udp_gro_receive(struct sk_buff **head, struct sk_buff *skb, struct udphdr *uh); int udp_gro_complete(struct sk_buff *skb, int nhoff); 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; } /* hash routines shared between UDPv4/6 and UDP-Litev4/6 */ static inline void udp_lib_hash(struct sock *sk) { BUG(); } 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); } int udp_lib_get_port(struct sock *sk, unsigned short snum, int (*)(const struct sock *, const struct sock *), 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); } /* net/ipv4/udp.c */ 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_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_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 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); /* * 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 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 */