Initial import

1 files changed, 336 insertions, 0 deletions

diff --git a/include/net/udp.h b/include/net/udp.h
new file mode 100644
index 000000000..6d4ed18e1
--- /dev/null
+++ b/include/net/udp.h
@@ -0,0 +1,336 @@
+/*
+ * 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 */