linux/net/ipv6/datagram.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *	common UDP/RAW code
 *	Linux INET6 implementation
 *
 *	Authors:
 *	Pedro Roque		<[email protected]>
 */

#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in6.h>
#include <linux/ipv6.h>
#include <linux/route.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/icmp.h>

#include <net/ipv6.h>
#include <net/ndisc.h>
#include <net/addrconf.h>
#include <net/transp_v6.h>
#include <net/ip6_route.h>
#include <net/tcp_states.h>
#include <net/dsfield.h>
#include <net/sock_reuseport.h>

#include <linux/errqueue.h>
#include <linux/uaccess.h>

static bool ipv6_mapped_addr_any(const struct in6_addr *a)
{ … }

static void ip6_datagram_flow_key_init(struct flowi6 *fl6,
				       const struct sock *sk)
{ … }

int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr)
{ … }

void ip6_datagram_release_cb(struct sock *sk)
{ … }
EXPORT_SYMBOL_GPL(…);

int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr,
			   int addr_len)
{ … }
EXPORT_SYMBOL_GPL(…);

int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{ … }
EXPORT_SYMBOL_GPL(…);

int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
				 int addr_len)
{ … }
EXPORT_SYMBOL_GPL(…);

static void ipv6_icmp_error_rfc4884(const struct sk_buff *skb,
				    struct sock_ee_data_rfc4884 *out)
{ … }

void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
		     __be16 port, u32 info, u8 *payload)
{ … }
EXPORT_SYMBOL_GPL(…);

void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
{ … }

void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
{ … }

/* For some errors we have valid addr_offset even with zero payload and
 * zero port. Also, addr_offset should be supported if port is set.
 */
static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
{ … }

/* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
 *
 * At one point, excluding local errors was a quick test to identify icmp/icmp6
 * errors. This is no longer true, but the test remained, so the v6 stack,
 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
 */
static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
				      struct sock_exterr_skb *serr)
{ … }

/*
 *	Handle MSG_ERRQUEUE
 */
int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
{ … }
EXPORT_SYMBOL_GPL(…);

/*
 *	Handle IPV6_RECVPATHMTU
 */
int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
		     int *addr_len)
{ … }


void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
				 struct sk_buff *skb)
{ … }

void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
				    struct sk_buff *skb)
{ … }

void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
			  struct sk_buff *skb)
{ … }
EXPORT_SYMBOL_GPL(…);

int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
			  struct msghdr *msg, struct flowi6 *fl6,
			  struct ipcm6_cookie *ipc6)
{ … }
EXPORT_SYMBOL_GPL(…);

void __ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
			       __u16 srcp, __u16 destp, int rqueue, int bucket)
{ … }