Something went wrong. Try again.
(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657/* SPDX-License-Identifier: GPL-2.0-or-later *//* * 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! */#ifndef _UDP_H#define _UDP_H
#include <linux/list.h>#include <linux/bug.h>#include <net/inet_sock.h>#include <net/gso.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>#include <linux/indirect_call_wrapper.h>#include <linux/math.h>
/** * struct udp_skb_cb - UDP private variables * * @header: private variables used by IPv4/IPv6 */struct udp_skb_cb { union { struct inet_skb_parm h4;#if IS_ENABLED(CONFIG_IPV6) struct inet6_skb_parm h6;#endif } header;};#define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb))
/** * struct udp_hslot - UDP hash slot used by udp_table.hash/hash4 * * @head: head of list of sockets * @nulls_head: head of list of sockets, only used by hash4 * @count: number of sockets in 'head' list * @lock: spinlock protecting changes to head/count */struct udp_hslot { union { struct hlist_head head; /* hash4 uses hlist_nulls to avoid moving wrongly onto another * hlist, because rehash() can happen with lookup(). */ struct hlist_nulls_head nulls_head; }; int count; spinlock_t lock;} __aligned(2 * sizeof(long));
/** * struct udp_hslot_main - UDP hash slot used by udp_table.hash2 * * @hslot: basic hash slot * @hash4_cnt: number of sockets in hslot4 of the same * (local port, local address) */struct udp_hslot_main { struct udp_hslot hslot; /* must be the first member */#if !IS_ENABLED(CONFIG_BASE_SMALL) u32 hash4_cnt;#endif} __aligned(2 * sizeof(long));#define UDP_HSLOT_MAIN(__hslot) ((struct udp_hslot_main *)(__hslot))
/** * 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) * @hash4: hash table, connected sockets are hashed on * (local port, local address, remote port, remote 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_main *hash2;#if !IS_ENABLED(CONFIG_BASE_SMALL) struct udp_hslot *hash4;#endif unsigned int mask; unsigned int log;};extern struct udp_table udp_table;
static inline struct udp_hslot *udp_hashslot(struct udp_table *table, const 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].hslot;}
#if IS_ENABLED(CONFIG_BASE_SMALL)static inline void udp_table_hash4_init(struct udp_table *table){}
static inline struct udp_hslot *udp_hashslot4(struct udp_table *table, unsigned int hash){ BUILD_BUG(); return NULL;}
static inline bool udp_hashed4(const struct sock *sk){ return false;}
static inline unsigned int udp_hash4_slot_size(void){ return 0;}
static inline bool udp_has_hash4(const struct udp_hslot *hslot2){ return false;}
static inline void udp_hash4_inc(struct udp_hslot *hslot2){}
static inline void udp_hash4_dec(struct udp_hslot *hslot2){}#else /* !CONFIG_BASE_SMALL */
/* Must be called with table->hash2 initialized */static inline void udp_table_hash4_init(struct udp_table *table){ table->hash4 = (void *)(table->hash2 + (table->mask + 1)); for (int i = 0; i <= table->mask; i++) { table->hash2[i].hash4_cnt = 0;
INIT_HLIST_NULLS_HEAD(&table->hash4[i].nulls_head, i); table->hash4[i].count = 0; spin_lock_init(&table->hash4[i].lock); }}
static inline struct udp_hslot *udp_hashslot4(struct udp_table *table, unsigned int hash){ return &table->hash4[hash & table->mask];}
static inline bool udp_hashed4(const struct sock *sk){ return !hlist_nulls_unhashed(&udp_sk(sk)->udp_lrpa_node);}
static inline unsigned int udp_hash4_slot_size(void){ return sizeof(struct udp_hslot);}
static inline bool udp_has_hash4(const struct udp_hslot *hslot2){ return UDP_HSLOT_MAIN(hslot2)->hash4_cnt;}
static inline void udp_hash4_inc(struct udp_hslot *hslot2){ UDP_HSLOT_MAIN(hslot2)->hash4_cnt++;}
static inline void udp_hash4_dec(struct udp_hslot *hslot2){ UDP_HSLOT_MAIN(hslot2)->hash4_cnt--;}#endif /* CONFIG_BASE_SMALL */
extern struct proto udp_prot;
DECLARE_PER_CPU(int, udp_memory_per_cpu_fw_alloc);
/* 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 v4 and v6 */static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb){ return __skb_checksum_complete(skb);}
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);
static inline void udp_csum_pull_header(struct sk_buff *skb){ if (!skb->csum_valid && skb->ip_summed == CHECKSUM_NONE) skb->csum = csum_partial(skb->data, sizeof(struct udphdr), skb->csum); skb_pull_rcsum(skb, sizeof(struct udphdr));}
typedef struct sock *(*udp_lookup_t)(const struct sk_buff *skb, __be16 sport, __be16 dport);
void udp_v6_early_demux(struct sk_buff *skb);INDIRECT_CALLABLE_DECLARE(int udpv6_rcv(struct sk_buff *));
int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len);INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int flags));
struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb, netdev_features_t features, bool is_ipv6);
static inline int udp_lib_init_sock(struct sock *sk){ struct udp_sock *up = udp_sk(sk);
sk->sk_drop_counters = &up->drop_counters; skb_queue_head_init(&up->reader_queue); INIT_HLIST_NODE(&up->tunnel_list); up->forward_threshold = sk->sk_rcvbuf >> 2; set_bit(SOCK_CUSTOM_SOCKOPT, &sk->sk_socket->flags);
up->udp_prod_queue = kzalloc_objs(*up->udp_prod_queue, nr_node_ids); if (!up->udp_prod_queue) return -ENOMEM; for (int i = 0; i < nr_node_ids; i++) init_llist_head(&up->udp_prod_queue[i].ll_root); return 0;}
static inline void udp_drops_inc(struct sock *sk){ numa_drop_add(&udp_sk(sk)->drop_counters, 1);}
/* hash routines shared between UDPv4/6 */static inline int udp_lib_hash(struct sock *sk){ BUG(); return 0;}
void udp_lib_unhash(struct sock *sk);void udp_lib_rehash(struct sock *sk, u16 new_hash, u16 new_hash4);u32 udp_ehashfn(const struct net *net, const __be32 laddr, const __u16 lport, const __be32 faddr, const __be16 fport);
static inline void udp_lib_close(struct sock *sk, long timeout){ sk_common_release(sk);}
/* hash4 routines shared between UDPv4/6 */#if IS_ENABLED(CONFIG_BASE_SMALL)static inline void udp_lib_hash4(struct sock *sk, u16 hash){}
static inline void udp4_hash4(struct sock *sk){}#else /* !CONFIG_BASE_SMALL */void udp_lib_hash4(struct sock *sk, u16 hash);void udp4_hash4(struct sock *sk);#endif /* CONFIG_BASE_SMALL */
int udp_lib_get_port(struct sock *sk, unsigned short snum, 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 possibility 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(reciprocal_scale(hash, max - min + 1) + min);}
static inline int udp_rqueue_get(struct sock *sk){ return sk_rmem_alloc_get(sk) - READ_ONCE(udp_sk(sk)->forward_deficit);}
static inline bool udp_sk_bound_dev_eq(const struct net *net, int bound_dev_if, int dif, int sdif){#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) return inet_bound_dev_eq(!!READ_ONCE(net->ipv4.sysctl_udp_l3mdev_accept), bound_dev_if, dif, sdif);#else return inet_bound_dev_eq(true, bound_dev_if, dif, sdif);#endif}
/* net/ipv4/udp.c */void udp_destruct_common(struct sock *sk);void skb_consume_udp(struct sock *sk, struct sk_buff *skb, int len);int __udp_enqueue_schedule_skb(struct sock *sk, struct sk_buff *skb);void udp_skb_destructor(struct sock *sk, struct sk_buff *skb);struct sk_buff *__skb_recv_udp(struct sock *sk, unsigned int flags, int *off, int *err);static inline struct sk_buff *skb_recv_udp(struct sock *sk, unsigned int flags, int *err){ int off = 0;
return __skb_recv_udp(sk, flags, &off, err);}
enum skb_drop_reason udp_v4_early_demux(struct sk_buff *skb);bool udp_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst);int udp_err(struct sk_buff *, u32);int udp_abort(struct sock *sk, int err);int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len);INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int flags));void udp_splice_eof(struct socket *sock);int udp_push_pending_frames(struct sock *sk);void udp_flush_pending_frames(struct sock *sk);int udp_cmsg_send(struct sock *sk, struct msghdr *msg, u16 *gso_size);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, int *karg);int udp_pre_connect(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len);int __udp_disconnect(struct sock *sk, int flags);int udp_disconnect(struct sock *sk, int flags);__poll_t 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, sockopt_t *opt);int udp_lib_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, unsigned int optlen, int (*push_pending_frames)(struct sock *));struct sock *udp4_lib_lookup(const struct net *net, __be32 saddr, __be16 sport, __be32 daddr, __be16 dport, int dif);struct sock *__udp4_lib_lookup(const struct net *net, __be32 saddr, __be16 sport, __be32 daddr, __be16 dport, int dif, int sdif, struct sk_buff *skb);struct sock *udp4_lib_lookup_skb(const struct sk_buff *skb, __be16 sport, __be16 dport);struct sock *udp6_lib_lookup(const struct net *net, const struct in6_addr *saddr, __be16 sport, const struct in6_addr *daddr, __be16 dport, int dif);struct sock *__udp6_lib_lookup(const struct net *net, const struct in6_addr *saddr, __be16 sport, const struct in6_addr *daddr, __be16 dport, int dif, int sdif, struct sk_buff *skb);struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb, __be16 sport, __be16 dport);int udp_read_skb(struct sock *sk, skb_read_actor_t recv_actor);
/* UDP uses skb->dev_scratch to cache as much information as possible and avoid * possibly multiple cache miss on dequeue() */struct udp_dev_scratch { /* skb->truesize and the stateless bit are embedded in a single field; * do not use a bitfield since the compiler emits better/smaller code * this way */ u32 _tsize_state;
#if BITS_PER_LONG == 64 /* len and the bit needed to compute skb_csum_unnecessary * will be on cold cache lines at recvmsg time. * skb->len can be stored on 16 bits since the udp header has been * already validated and pulled. */ u16 len; bool is_linear; bool csum_unnecessary;#endif};
static inline struct udp_dev_scratch *udp_skb_scratch(struct sk_buff *skb){ return (struct udp_dev_scratch *)&skb->dev_scratch;}
#if BITS_PER_LONG == 64static inline unsigned int udp_skb_len(struct sk_buff *skb){ return udp_skb_scratch(skb)->len;}
static inline bool udp_skb_csum_unnecessary(struct sk_buff *skb){ return udp_skb_scratch(skb)->csum_unnecessary;}
static inline bool udp_skb_is_linear(struct sk_buff *skb){ return udp_skb_scratch(skb)->is_linear;}
#elsestatic inline unsigned int udp_skb_len(struct sk_buff *skb){ return skb->len;}
static inline bool udp_skb_csum_unnecessary(struct sk_buff *skb){ return skb_csum_unnecessary(skb);}
static inline bool udp_skb_is_linear(struct sk_buff *skb){ return !skb_is_nonlinear(skb);}#endif
static inline int copy_linear_skb(struct sk_buff *skb, int len, int off, struct iov_iter *to){ return copy_to_iter_full(skb->data + off, len, to) ? 0 : -EFAULT;}
/* * SNMP statistics for UDP */#define __UDP_INC_STATS(net, field) \ __SNMP_INC_STATS((net)->mib.udp_statistics, field)#define UDP_INC_STATS(net, field) \ SNMP_INC_STATS((net)->mib.udp_statistics, field)#define __UDP6_INC_STATS(net, field) \ __SNMP_INC_STATS((net)->mib.udp_stats_in6, field)#define UDP6_INC_STATS(net, field) \ SNMP_INC_STATS((net)->mib.udp_stats_in6, field)
#if IS_ENABLED(CONFIG_IPV6)#define __UDPX_MIB(sk, ipv4) \ ({ \ ipv4 ? sock_net(sk)->mib.udp_statistics : \ sock_net(sk)->mib.udp_stats_in6; \ })#else#define __UDPX_MIB(sk, ipv4) \ ({ \ sock_net(sk)->mib.udp_statistics; \ })#endif
#define __UDPX_INC_STATS(sk, field) \ __SNMP_INC_STATS(__UDPX_MIB(sk, (sk)->sk_family == AF_INET), field)
#ifdef CONFIG_PROC_FSstruct udp_seq_afinfo { sa_family_t family;};
struct udp_iter_state { struct seq_net_private p; int bucket;};
void *udp_seq_start(struct seq_file *seq, loff_t *pos);void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos);void udp_seq_stop(struct seq_file *seq, void *v);
int udp4_proc_init(void);void udp4_proc_exit(void);#endif /* CONFIG_PROC_FS */
int udpv4_offload_init(void);
void udp_init(void);
DECLARE_STATIC_KEY_FALSE(udp_encap_needed_key);void udp_encap_enable(void);void udp_encap_disable(void);#if IS_ENABLED(CONFIG_IPV6)DECLARE_STATIC_KEY_FALSE(udpv6_encap_needed_key);void udpv6_encap_enable(void);#endif
static inline struct sk_buff *udp_rcv_segment(struct sock *sk, struct sk_buff *skb, bool ipv4){ netdev_features_t features = NETIF_F_SG; struct sk_buff *segs; int drop_count;
/* * Segmentation in UDP receive path is only for UDP GRO, drop udp * fragmentation offload (UFO) packets. */ if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) { drop_count = 1; goto drop; }
/* Avoid csum recalculation by skb_segment unless userspace explicitly * asks for the final checksum values */ if (!inet_get_convert_csum(sk)) features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
/* UDP segmentation expects packets of type CHECKSUM_PARTIAL or * CHECKSUM_NONE in __udp_gso_segment. UDP GRO indeed builds partial * packets in udp_gro_complete_segment. As does UDP GSO, verified by * udp_send_skb. But when those packets are looped in dev_loopback_xmit * their ip_summed CHECKSUM_NONE is changed to CHECKSUM_UNNECESSARY. * Reset in this specific case, where PARTIAL is both correct and * required. */ if (skb->pkt_type == PACKET_LOOPBACK) skb->ip_summed = CHECKSUM_PARTIAL;
/* the GSO CB lays after the UDP one, no need to save and restore any * CB fragment */ segs = __skb_gso_segment(skb, features, false, 0); if (IS_ERR_OR_NULL(segs)) { drop_count = skb_shinfo(skb)->gso_segs; goto drop; }
consume_skb(skb); return segs;
drop: sk_drops_add(sk, drop_count); SNMP_ADD_STATS(__UDPX_MIB(sk, ipv4), UDP_MIB_INERRORS, drop_count); kfree_skb(skb); return NULL;}
static inline void udp_post_segment_fix_csum(struct sk_buff *skb){ /* UDP packets generated with UDP_SEGMENT and traversing: * * UDP tunnel(xmit) -> veth (segmentation) -> veth (gro) -> UDP tunnel (rx) * * can reach an UDP socket with CHECKSUM_NONE, because * __iptunnel_pull_header() converts CHECKSUM_PARTIAL into NONE. * SKB_GSO_UDP_L4 or SKB_GSO_FRAGLIST packets with no UDP tunnel will * have a valid checksum, as the GRO engine validates the UDP csum * before the aggregation and nobody strips such info in between. * Instead of adding another check in the tunnel fastpath, we can force * a valid csum after the segmentation. * Additionally fixup the UDP CB. */ if (skb->ip_summed == CHECKSUM_NONE && !skb->csum_valid) skb->csum_valid = 1;}
#ifdef CONFIG_BPF_SYSCALLstruct sk_psock;int udp_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);#endif
#endif /* _UDP_H */