// SPDX-License-Identifier: GPL-2.0 /* * 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. * * The IP to API glue. * * Authors: see ip.c * * Fixes: * Many : Split from ip.c , see ip.c for history. * Martin Mares : TOS setting fixed. * Alan Cox : Fixed a couple of oopses in Martin's * TOS tweaks. * Mike McLagan : Routing by source */ #include <linux/module.h> #include <linux/types.h> #include <linux/mm.h> #include <linux/skbuff.h> #include <linux/ip.h> #include <linux/icmp.h> #include <linux/inetdevice.h> #include <linux/netdevice.h> #include <linux/slab.h> #include <net/sock.h> #include <net/ip.h> #include <net/icmp.h> #include <net/tcp_states.h> #include <linux/udp.h> #include <linux/igmp.h> #include <linux/netfilter.h> #include <linux/route.h> #include <linux/mroute.h> #include <net/inet_ecn.h> #include <net/route.h> #include <net/xfrm.h> #include <net/compat.h> #include <net/checksum.h> #if IS_ENABLED(CONFIG_IPV6) #include <net/transp_v6.h> #endif #include <net/ip_fib.h> #include <linux/errqueue.h> #include <linux/uaccess.h> /* * SOL_IP control messages. */ static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) { … } static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) { … } static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) { … } static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) { … } static void ip_cmsg_recv_retopts(struct net *net, struct msghdr *msg, struct sk_buff *skb) { … } static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb) { … } static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb, int tlen, int offset) { … } static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) { … } static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) { … } void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, struct sk_buff *skb, int tlen, int offset) { … } EXPORT_SYMBOL(…); int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, bool allow_ipv6) { … } static void ip_ra_destroy_rcu(struct rcu_head *head) { … } int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *)) { … } static void ipv4_icmp_error_rfc4884(const struct sk_buff *skb, struct sock_ee_data_rfc4884 *out) { … } void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, u32 info, u8 *payload) { … } EXPORT_SYMBOL_GPL(…); void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) { … } /* 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 ipv4_datagram_support_addr(struct sock_exterr_skb *serr) { … } /* IPv4 supports cmsg on all imcp errors and some timestamps * * Timestamp code paths do not initialize the fields expected by cmsg: * the PKTINFO fields in skb->cb[]. Fill those in here. */ static bool ipv4_datagram_support_cmsg(const struct sock *sk, struct sk_buff *skb, int ee_origin) { … } /* * Handle MSG_ERRQUEUE */ int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) { … } void __ip_sock_set_tos(struct sock *sk, int val) { … } void ip_sock_set_tos(struct sock *sk, int val) { … } EXPORT_SYMBOL(…); void ip_sock_set_freebind(struct sock *sk) { … } EXPORT_SYMBOL(…); void ip_sock_set_recverr(struct sock *sk) { … } EXPORT_SYMBOL(…); int ip_sock_set_mtu_discover(struct sock *sk, int val) { … } EXPORT_SYMBOL(…); void ip_sock_set_pktinfo(struct sock *sk) { … } EXPORT_SYMBOL(…); /* * Socket option code for IP. This is the end of the line after any * TCP,UDP etc options on an IP socket. */ static bool setsockopt_needs_rtnl(int optname) { … } static int set_mcast_msfilter(struct sock *sk, int ifindex, int numsrc, int fmode, struct sockaddr_storage *group, struct sockaddr_storage *list) { … } static int copy_group_source_from_sockptr(struct group_source_req *greqs, sockptr_t optval, int optlen) { … } static int do_mcast_group_source(struct sock *sk, int optname, sockptr_t optval, int optlen) { … } static int ip_set_mcast_msfilter(struct sock *sk, sockptr_t optval, int optlen) { … } static int compat_ip_set_mcast_msfilter(struct sock *sk, sockptr_t optval, int optlen) { … } static int ip_mcast_join_leave(struct sock *sk, int optname, sockptr_t optval, int optlen) { … } static int compat_ip_mcast_join_leave(struct sock *sk, int optname, sockptr_t optval, int optlen) { … } DEFINE_STATIC_KEY_FALSE(ip4_min_ttl); int do_ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, unsigned int optlen) { … } /** * ipv4_pktinfo_prepare - transfer some info from rtable to skb * @sk: socket * @skb: buffer * @drop_dst: if true, drops skb dst * * To support IP_CMSG_PKTINFO option, we store rt_iif and specific * destination in skb->cb[] before dst drop. * This way, receiver doesn't make cache line misses to read rtable. */ void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb, bool drop_dst) { … } int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, unsigned int optlen) { … } EXPORT_SYMBOL(…); /* * Get the options. Note for future reference. The GET of IP options gets * the _received_ ones. The set sets the _sent_ ones. */ static bool getsockopt_needs_rtnl(int optname) { … } static int ip_get_mcast_msfilter(struct sock *sk, sockptr_t optval, sockptr_t optlen, int len) { … } static int compat_ip_get_mcast_msfilter(struct sock *sk, sockptr_t optval, sockptr_t optlen, int len) { … } int do_ip_getsockopt(struct sock *sk, int level, int optname, sockptr_t optval, sockptr_t optlen) { … } int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen) { … } EXPORT_SYMBOL(…);
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