160c778b2SVlad Yasevich /* SCTP kernel implementation 21da177e4SLinus Torvalds * (C) Copyright IBM Corp. 2001, 2004 31da177e4SLinus Torvalds * Copyright (c) 1999-2000 Cisco, Inc. 41da177e4SLinus Torvalds * Copyright (c) 1999-2001 Motorola, Inc. 51da177e4SLinus Torvalds * Copyright (c) 2001-2003 Intel Corp. 61da177e4SLinus Torvalds * 760c778b2SVlad Yasevich * This file is part of the SCTP kernel implementation 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * The base lksctp header. 101da177e4SLinus Torvalds * 1160c778b2SVlad Yasevich * This SCTP implementation is free software; 121da177e4SLinus Torvalds * you can redistribute it and/or modify it under the terms of 131da177e4SLinus Torvalds * the GNU General Public License as published by 141da177e4SLinus Torvalds * the Free Software Foundation; either version 2, or (at your option) 151da177e4SLinus Torvalds * any later version. 161da177e4SLinus Torvalds * 1760c778b2SVlad Yasevich * This SCTP implementation is distributed in the hope that it 181da177e4SLinus Torvalds * will be useful, but WITHOUT ANY WARRANTY; without even the implied 191da177e4SLinus Torvalds * ************************ 201da177e4SLinus Torvalds * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 211da177e4SLinus Torvalds * See the GNU General Public License for more details. 221da177e4SLinus Torvalds * 231da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 244b2f13a2SJeff Kirsher * along with GNU CC; see the file COPYING. If not, see 254b2f13a2SJeff Kirsher * <http://www.gnu.org/licenses/>. 261da177e4SLinus Torvalds * 271da177e4SLinus Torvalds * Please send any bug reports or fixes you make to the 281da177e4SLinus Torvalds * email address(es): 2991705c61SDaniel Borkmann * lksctp developers <linux-sctp@vger.kernel.org> 301da177e4SLinus Torvalds * 311da177e4SLinus Torvalds * Written or modified by: 321da177e4SLinus Torvalds * La Monte H.P. Yarroll <piggy@acm.org> 331da177e4SLinus Torvalds * Xingang Guo <xingang.guo@intel.com> 341da177e4SLinus Torvalds * Jon Grimm <jgrimm@us.ibm.com> 351da177e4SLinus Torvalds * Daisy Chang <daisyc@us.ibm.com> 361da177e4SLinus Torvalds * Sridhar Samudrala <sri@us.ibm.com> 371da177e4SLinus Torvalds * Ardelle Fan <ardelle.fan@intel.com> 381da177e4SLinus Torvalds * Ryan Layer <rmlayer@us.ibm.com> 391da177e4SLinus Torvalds * Kevin Gao <kevin.gao@intel.com> 401da177e4SLinus Torvalds */ 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds #ifndef __net_sctp_h__ 431da177e4SLinus Torvalds #define __net_sctp_h__ 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds /* Header Strategy. 461da177e4SLinus Torvalds * Start getting some control over the header file depencies: 471da177e4SLinus Torvalds * includes 481da177e4SLinus Torvalds * constants 491da177e4SLinus Torvalds * structs 501da177e4SLinus Torvalds * prototypes 511da177e4SLinus Torvalds * macros, externs, and inlines 521da177e4SLinus Torvalds * 531da177e4SLinus Torvalds * Move test_frame specific items out of the kernel headers 541da177e4SLinus Torvalds * and into the test frame headers. This is not perfect in any sense 551da177e4SLinus Torvalds * and will continue to evolve. 561da177e4SLinus Torvalds */ 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds #include <linux/types.h> 591da177e4SLinus Torvalds #include <linux/slab.h> 601da177e4SLinus Torvalds #include <linux/in.h> 611da177e4SLinus Torvalds #include <linux/tty.h> 621da177e4SLinus Torvalds #include <linux/proc_fs.h> 631da177e4SLinus Torvalds #include <linux/spinlock.h> 641da177e4SLinus Torvalds #include <linux/jiffies.h> 651da177e4SLinus Torvalds #include <linux/idr.h> 661da177e4SLinus Torvalds 67dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 681da177e4SLinus Torvalds #include <net/ipv6.h> 691da177e4SLinus Torvalds #include <net/ip6_route.h> 701da177e4SLinus Torvalds #endif 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds #include <asm/uaccess.h> 731da177e4SLinus Torvalds #include <asm/page.h> 741da177e4SLinus Torvalds #include <net/sock.h> 751da177e4SLinus Torvalds #include <net/snmp.h> 761da177e4SLinus Torvalds #include <net/sctp/structs.h> 771da177e4SLinus Torvalds #include <net/sctp/constants.h> 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds #ifdef CONFIG_IP_SCTP_MODULE 801da177e4SLinus Torvalds #define SCTP_PROTOSW_FLAG 0 811da177e4SLinus Torvalds #else /* static! */ 821da177e4SLinus Torvalds #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT 831da177e4SLinus Torvalds #endif 841da177e4SLinus Torvalds 853822a5ffSMarcelo Ricardo Leitner /* Round an int up to the next multiple of 4. */ 863822a5ffSMarcelo Ricardo Leitner #define WORD_ROUND(s) (((s)+3)&~3) 873822a5ffSMarcelo Ricardo Leitner /* Truncate to the previous multiple of 4. */ 883822a5ffSMarcelo Ricardo Leitner #define WORD_TRUNC(s) ((s)&~3) 893822a5ffSMarcelo Ricardo Leitner 901da177e4SLinus Torvalds /* 911da177e4SLinus Torvalds * Function declarations. 921da177e4SLinus Torvalds */ 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds /* 951da177e4SLinus Torvalds * sctp/protocol.c 961da177e4SLinus Torvalds */ 977b584460SJoe Perches int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *, 987b584460SJoe Perches sctp_scope_t, gfp_t gfp, int flags); 997b584460SJoe Perches struct sctp_pf *sctp_get_pf_specific(sa_family_t family); 1007b584460SJoe Perches int sctp_register_pf(struct sctp_pf *, sa_family_t); 1017b584460SJoe Perches void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int); 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds /* 1041da177e4SLinus Torvalds * sctp/socket.c 1051da177e4SLinus Torvalds */ 1061da177e4SLinus Torvalds int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); 1071da177e4SLinus Torvalds int sctp_inet_listen(struct socket *sock, int backlog); 1081da177e4SLinus Torvalds void sctp_write_space(struct sock *sk); 109676d2369SDavid S. Miller void sctp_data_ready(struct sock *sk); 1101da177e4SLinus Torvalds unsigned int sctp_poll(struct file *file, struct socket *sock, 1111da177e4SLinus Torvalds poll_table *wait); 112331c4ee7SVlad Yasevich void sctp_sock_rfree(struct sk_buff *skb); 113914e1c8bSVlad Yasevich void sctp_copy_sock(struct sock *newsk, struct sock *sk, 114914e1c8bSVlad Yasevich struct sctp_association *asoc); 1151748376bSEric Dumazet extern struct percpu_counter sctp_sockets_allocated; 1167b584460SJoe Perches int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *); 1172347c80fSGeir Ola Vaagland struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *); 1181da177e4SLinus Torvalds 119626d16f5SXin Long int sctp_transport_walk_start(struct rhashtable_iter *iter); 120626d16f5SXin Long void sctp_transport_walk_stop(struct rhashtable_iter *iter); 121626d16f5SXin Long struct sctp_transport *sctp_transport_get_next(struct net *net, 122626d16f5SXin Long struct rhashtable_iter *iter); 123626d16f5SXin Long struct sctp_transport *sctp_transport_get_idx(struct net *net, 124626d16f5SXin Long struct rhashtable_iter *iter, int pos); 125626d16f5SXin Long int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *), 126626d16f5SXin Long struct net *net, 127626d16f5SXin Long const union sctp_addr *laddr, 128626d16f5SXin Long const union sctp_addr *paddr, void *p); 129626d16f5SXin Long int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *), 130626d16f5SXin Long struct net *net, int pos, void *p); 131626d16f5SXin Long int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *), void *p); 13252c52a61SXin Long int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc, 13352c52a61SXin Long struct sctp_info *info); 13452c52a61SXin Long 1351da177e4SLinus Torvalds /* 1361da177e4SLinus Torvalds * sctp/primitive.c 1371da177e4SLinus Torvalds */ 13855e26eb9SEric W. Biederman int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg); 13955e26eb9SEric W. Biederman int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg); 14055e26eb9SEric W. Biederman int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg); 14155e26eb9SEric W. Biederman int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg); 14255e26eb9SEric W. Biederman int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg); 14355e26eb9SEric W. Biederman int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg); 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds /* 1461da177e4SLinus Torvalds * sctp/input.c 1471da177e4SLinus Torvalds */ 1481da177e4SLinus Torvalds int sctp_rcv(struct sk_buff *skb); 1491da177e4SLinus Torvalds void sctp_v4_err(struct sk_buff *skb, u32 info); 1501da177e4SLinus Torvalds void sctp_hash_endpoint(struct sctp_endpoint *); 1511da177e4SLinus Torvalds void sctp_unhash_endpoint(struct sctp_endpoint *); 1524110cc25SEric W. Biederman struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *, 153d1ad1ff2SSridhar Samudrala struct sctphdr *, struct sctp_association **, 1541da177e4SLinus Torvalds struct sctp_transport **); 155d1ad1ff2SSridhar Samudrala void sctp_err_finish(struct sock *, struct sctp_association *); 1561da177e4SLinus Torvalds void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 1571da177e4SLinus Torvalds struct sctp_transport *t, __u32 pmtu); 158ec18d9a2SDavid S. Miller void sctp_icmp_redirect(struct sock *, struct sctp_transport *, 159ec18d9a2SDavid S. Miller struct sk_buff *); 1601da177e4SLinus Torvalds void sctp_icmp_proto_unreachable(struct sock *sk, 1611da177e4SLinus Torvalds struct sctp_association *asoc, 1621da177e4SLinus Torvalds struct sctp_transport *t); 163c4d2444eSSridhar Samudrala void sctp_backlog_migrate(struct sctp_association *assoc, 164c4d2444eSSridhar Samudrala struct sock *oldsk, struct sock *newsk); 165d6c0256aSXin Long int sctp_transport_hashtable_init(void); 166d6c0256aSXin Long void sctp_transport_hashtable_destroy(void); 167d6c0256aSXin Long void sctp_hash_transport(struct sctp_transport *t); 168d6c0256aSXin Long void sctp_unhash_transport(struct sctp_transport *t); 169d6c0256aSXin Long struct sctp_transport *sctp_addrs_lookup_transport( 170d6c0256aSXin Long struct net *net, 171d6c0256aSXin Long const union sctp_addr *laddr, 172d6c0256aSXin Long const union sctp_addr *paddr); 173d6c0256aSXin Long struct sctp_transport *sctp_epaddr_lookup_transport( 174d6c0256aSXin Long const struct sctp_endpoint *ep, 175d6c0256aSXin Long const union sctp_addr *paddr); 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds /* 17816164366SAdrian Bunk * sctp/proc.c 17916164366SAdrian Bunk */ 18013d782f6SEric W. Biederman int sctp_snmp_proc_init(struct net *net); 18113d782f6SEric W. Biederman void sctp_snmp_proc_exit(struct net *net); 18213d782f6SEric W. Biederman int sctp_eps_proc_init(struct net *net); 18313d782f6SEric W. Biederman void sctp_eps_proc_exit(struct net *net); 18413d782f6SEric W. Biederman int sctp_assocs_proc_init(struct net *net); 18513d782f6SEric W. Biederman void sctp_assocs_proc_exit(struct net *net); 18613d782f6SEric W. Biederman int sctp_remaddr_proc_init(struct net *net); 18713d782f6SEric W. Biederman void sctp_remaddr_proc_exit(struct net *net); 18816164366SAdrian Bunk 18916164366SAdrian Bunk 19016164366SAdrian Bunk /* 1910a5fcb9cSsebastian@breakpoint.cc * Module global variables 1920a5fcb9cSsebastian@breakpoint.cc */ 1930a5fcb9cSsebastian@breakpoint.cc 1940a5fcb9cSsebastian@breakpoint.cc /* 1950a5fcb9cSsebastian@breakpoint.cc * sctp/protocol.c 1960a5fcb9cSsebastian@breakpoint.cc */ 1970a5fcb9cSsebastian@breakpoint.cc extern struct kmem_cache *sctp_chunk_cachep __read_mostly; 1980a5fcb9cSsebastian@breakpoint.cc extern struct kmem_cache *sctp_bucket_cachep __read_mostly; 1997e3ea6d5SYing Xue extern long sysctl_sctp_mem[3]; 2007e3ea6d5SYing Xue extern int sysctl_sctp_rmem[3]; 2017e3ea6d5SYing Xue extern int sysctl_sctp_wmem[3]; 2020a5fcb9cSsebastian@breakpoint.cc 2030a5fcb9cSsebastian@breakpoint.cc /* 2041da177e4SLinus Torvalds * Section: Macros, externs, and inlines 2051da177e4SLinus Torvalds */ 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds /* SCTP SNMP MIB stats handlers */ 208b01a2407SEric W. Biederman #define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field) 20913415e46SEric Dumazet #define __SCTP_INC_STATS(net, field) __SNMP_INC_STATS((net)->sctp.sctp_statistics, field) 210b01a2407SEric W. Biederman #define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field) 2111da177e4SLinus Torvalds 212ac0b0462SSridhar Samudrala /* sctp mib definitions */ 213fd2c3ef7SEric Dumazet enum { 214ac0b0462SSridhar Samudrala SCTP_MIB_NUM = 0, 215ac0b0462SSridhar Samudrala SCTP_MIB_CURRESTAB, /* CurrEstab */ 216ac0b0462SSridhar Samudrala SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ 217ac0b0462SSridhar Samudrala SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ 218ac0b0462SSridhar Samudrala SCTP_MIB_ABORTEDS, /* Aborteds */ 219ac0b0462SSridhar Samudrala SCTP_MIB_SHUTDOWNS, /* Shutdowns */ 220ac0b0462SSridhar Samudrala SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ 221ac0b0462SSridhar Samudrala SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ 222ac0b0462SSridhar Samudrala SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ 223ac0b0462SSridhar Samudrala SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ 224ac0b0462SSridhar Samudrala SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ 225ac0b0462SSridhar Samudrala SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ 226ac0b0462SSridhar Samudrala SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ 227ac0b0462SSridhar Samudrala SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ 228ac0b0462SSridhar Samudrala SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ 229ac0b0462SSridhar Samudrala SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ 230ac0b0462SSridhar Samudrala SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ 231ac0b0462SSridhar Samudrala SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ 232ac0b0462SSridhar Samudrala SCTP_MIB_T1_INIT_EXPIREDS, 233ac0b0462SSridhar Samudrala SCTP_MIB_T1_COOKIE_EXPIREDS, 234ac0b0462SSridhar Samudrala SCTP_MIB_T2_SHUTDOWN_EXPIREDS, 235ac0b0462SSridhar Samudrala SCTP_MIB_T3_RTX_EXPIREDS, 236ac0b0462SSridhar Samudrala SCTP_MIB_T4_RTO_EXPIREDS, 237ac0b0462SSridhar Samudrala SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, 238ac0b0462SSridhar Samudrala SCTP_MIB_DELAY_SACK_EXPIREDS, 239ac0b0462SSridhar Samudrala SCTP_MIB_AUTOCLOSE_EXPIREDS, 240b6157d8eSVlad Yasevich SCTP_MIB_T1_RETRANSMITS, 241ac0b0462SSridhar Samudrala SCTP_MIB_T3_RETRANSMITS, 242ac0b0462SSridhar Samudrala SCTP_MIB_PMTUD_RETRANSMITS, 243ac0b0462SSridhar Samudrala SCTP_MIB_FAST_RETRANSMITS, 244ac0b0462SSridhar Samudrala SCTP_MIB_IN_PKT_SOFTIRQ, 245ac0b0462SSridhar Samudrala SCTP_MIB_IN_PKT_BACKLOG, 246ac0b0462SSridhar Samudrala SCTP_MIB_IN_PKT_DISCARDS, 247ac0b0462SSridhar Samudrala SCTP_MIB_IN_DATA_CHUNK_DISCARDS, 248ac0b0462SSridhar Samudrala __SCTP_MIB_MAX 249ac0b0462SSridhar Samudrala }; 250ac0b0462SSridhar Samudrala 251ac0b0462SSridhar Samudrala #define SCTP_MIB_MAX __SCTP_MIB_MAX 252ac0b0462SSridhar Samudrala struct sctp_mib { 253ac0b0462SSridhar Samudrala unsigned long mibs[SCTP_MIB_MAX]; 254ec733b15SEric Dumazet }; 255ac0b0462SSridhar Samudrala 256196d6759SMichele Baldessari /* helper function to track stats about max rto and related transport */ 257196d6759SMichele Baldessari static inline void sctp_max_rto(struct sctp_association *asoc, 258196d6759SMichele Baldessari struct sctp_transport *trans) 259196d6759SMichele Baldessari { 260196d6759SMichele Baldessari if (asoc->stats.max_obs_rto < (__u64)trans->rto) { 261196d6759SMichele Baldessari asoc->stats.max_obs_rto = trans->rto; 262196d6759SMichele Baldessari memset(&asoc->stats.obs_rto_ipaddr, 0, 263196d6759SMichele Baldessari sizeof(struct sockaddr_storage)); 264196d6759SMichele Baldessari memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr, 265196d6759SMichele Baldessari trans->af_specific->sockaddr_len); 266196d6759SMichele Baldessari } 267196d6759SMichele Baldessari } 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds /* 2701da177e4SLinus Torvalds * Macros for keeping a global reference of object allocations. 2711da177e4SLinus Torvalds */ 2721da177e4SLinus Torvalds #ifdef CONFIG_SCTP_DBG_OBJCNT 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvalds extern atomic_t sctp_dbg_objcnt_sock; 2751da177e4SLinus Torvalds extern atomic_t sctp_dbg_objcnt_ep; 2761da177e4SLinus Torvalds extern atomic_t sctp_dbg_objcnt_assoc; 2771da177e4SLinus Torvalds extern atomic_t sctp_dbg_objcnt_transport; 2781da177e4SLinus Torvalds extern atomic_t sctp_dbg_objcnt_chunk; 2791da177e4SLinus Torvalds extern atomic_t sctp_dbg_objcnt_bind_addr; 2801da177e4SLinus Torvalds extern atomic_t sctp_dbg_objcnt_bind_bucket; 2811da177e4SLinus Torvalds extern atomic_t sctp_dbg_objcnt_addr; 2821da177e4SLinus Torvalds extern atomic_t sctp_dbg_objcnt_ssnmap; 2831da177e4SLinus Torvalds extern atomic_t sctp_dbg_objcnt_datamsg; 2841f485649SVlad Yasevich extern atomic_t sctp_dbg_objcnt_keys; 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds /* Macros to atomically increment/decrement objcnt counters. */ 2871da177e4SLinus Torvalds #define SCTP_DBG_OBJCNT_INC(name) \ 2881da177e4SLinus Torvalds atomic_inc(&sctp_dbg_objcnt_## name) 2891da177e4SLinus Torvalds #define SCTP_DBG_OBJCNT_DEC(name) \ 2901da177e4SLinus Torvalds atomic_dec(&sctp_dbg_objcnt_## name) 2911da177e4SLinus Torvalds #define SCTP_DBG_OBJCNT(name) \ 2921da177e4SLinus Torvalds atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds /* Macro to help create new entries in in the global array of 2951da177e4SLinus Torvalds * objcnt counters. 2961da177e4SLinus Torvalds */ 2971da177e4SLinus Torvalds #define SCTP_DBG_OBJCNT_ENTRY(name) \ 2981da177e4SLinus Torvalds {.label= #name, .counter= &sctp_dbg_objcnt_## name} 2991da177e4SLinus Torvalds 30013d782f6SEric W. Biederman void sctp_dbg_objcnt_init(struct net *); 30113d782f6SEric W. Biederman void sctp_dbg_objcnt_exit(struct net *); 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds #else 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds #define SCTP_DBG_OBJCNT_INC(name) 3061da177e4SLinus Torvalds #define SCTP_DBG_OBJCNT_DEC(name) 3071da177e4SLinus Torvalds 3081f07b62fSCong Wang static inline void sctp_dbg_objcnt_init(struct net *net) { return; } 3091f07b62fSCong Wang static inline void sctp_dbg_objcnt_exit(struct net *net) { return; } 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds #if defined CONFIG_SYSCTL 3141da177e4SLinus Torvalds void sctp_sysctl_register(void); 3151da177e4SLinus Torvalds void sctp_sysctl_unregister(void); 316ebb7e95dSEric W. Biederman int sctp_sysctl_net_register(struct net *net); 317ebb7e95dSEric W. Biederman void sctp_sysctl_net_unregister(struct net *net); 3181da177e4SLinus Torvalds #else 3191da177e4SLinus Torvalds static inline void sctp_sysctl_register(void) { return; } 3201da177e4SLinus Torvalds static inline void sctp_sysctl_unregister(void) { return; } 321ebb7e95dSEric W. Biederman static inline int sctp_sysctl_net_register(struct net *net) { return 0; } 322ebb7e95dSEric W. Biederman static inline void sctp_sysctl_net_unregister(struct net *net) { return; } 3231da177e4SLinus Torvalds #endif 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds /* Size of Supported Address Parameter for 'x' address types. */ 3261da177e4SLinus Torvalds #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 3271da177e4SLinus Torvalds 328dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 3291da177e4SLinus Torvalds 330270637abSVlad Yasevich void sctp_v6_pf_init(void); 331270637abSVlad Yasevich void sctp_v6_pf_exit(void); 332270637abSVlad Yasevich int sctp_v6_protosw_init(void); 333270637abSVlad Yasevich void sctp_v6_protosw_exit(void); 334827bf122SSridhar Samudrala int sctp_v6_add_protocol(void); 335827bf122SSridhar Samudrala void sctp_v6_del_protocol(void); 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds #else /* #ifdef defined(CONFIG_IPV6) */ 3381da177e4SLinus Torvalds 3391233823bSDavid S. Miller static inline void sctp_v6_pf_init(void) { return; } 340270637abSVlad Yasevich static inline void sctp_v6_pf_exit(void) { return; } 341270637abSVlad Yasevich static inline int sctp_v6_protosw_init(void) { return 0; } 342270637abSVlad Yasevich static inline void sctp_v6_protosw_exit(void) { return; } 343827bf122SSridhar Samudrala static inline int sctp_v6_add_protocol(void) { return 0; } 344827bf122SSridhar Samudrala static inline void sctp_v6_del_protocol(void) { return; } 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds #endif /* #if defined(CONFIG_IPV6) */ 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds /* Map an association to an assoc_id. */ 3501da177e4SLinus Torvalds static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 3511da177e4SLinus Torvalds { 352a02cec21SEric Dumazet return asoc ? asoc->assoc_id : 0; 3531da177e4SLinus Torvalds } 3541da177e4SLinus Torvalds 35538ab1fa9SDaniel Borkmann static inline enum sctp_sstat_state 35638ab1fa9SDaniel Borkmann sctp_assoc_to_state(const struct sctp_association *asoc) 35738ab1fa9SDaniel Borkmann { 35838ab1fa9SDaniel Borkmann /* SCTP's uapi always had SCTP_EMPTY(=0) as a dummy state, but we 35938ab1fa9SDaniel Borkmann * got rid of it in kernel space. Therefore SCTP_CLOSED et al 36038ab1fa9SDaniel Borkmann * start at =1 in user space, but actually as =0 in kernel space. 36138ab1fa9SDaniel Borkmann * Now that we can not break user space and SCTP_EMPTY is exposed 36238ab1fa9SDaniel Borkmann * there, we need to fix it up with an ugly offset not to break 36338ab1fa9SDaniel Borkmann * applications. :( 36438ab1fa9SDaniel Borkmann */ 36538ab1fa9SDaniel Borkmann return asoc->state + 1; 36638ab1fa9SDaniel Borkmann } 36738ab1fa9SDaniel Borkmann 3681da177e4SLinus Torvalds /* Look up the association by its id. */ 3691da177e4SLinus Torvalds struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 3701da177e4SLinus Torvalds 3710343c554SBenjamin Poirier int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp); 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds /* A macro to walk a list of skbs. */ 3741da177e4SLinus Torvalds #define sctp_skb_for_each(pos, head, tmp) \ 3753d09274cSDavid S. Miller skb_queue_walk_safe(head, pos, tmp) 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds /** 3781da177e4SLinus Torvalds * sctp_list_dequeue - remove from the head of the queue 3791da177e4SLinus Torvalds * @list: list to dequeue from 3801da177e4SLinus Torvalds * 3811da177e4SLinus Torvalds * Remove the head of the list. The head item is 3821da177e4SLinus Torvalds * returned or %NULL if the list is empty. 3831da177e4SLinus Torvalds */ 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds static inline struct list_head *sctp_list_dequeue(struct list_head *list) 3861da177e4SLinus Torvalds { 3871da177e4SLinus Torvalds struct list_head *result = NULL; 3881da177e4SLinus Torvalds 389eb8e9771SMarcelo Ricardo Leitner if (!list_empty(list)) { 3901da177e4SLinus Torvalds result = list->next; 391eb8e9771SMarcelo Ricardo Leitner list_del_init(result); 3921da177e4SLinus Torvalds } 3931da177e4SLinus Torvalds return result; 3941da177e4SLinus Torvalds } 3951da177e4SLinus Torvalds 396331c4ee7SVlad Yasevich /* SCTP version of skb_set_owner_r. We need this one because 397331c4ee7SVlad Yasevich * of the way we have to do receive buffer accounting on bundled 398331c4ee7SVlad Yasevich * chunks. 399331c4ee7SVlad Yasevich */ 400331c4ee7SVlad Yasevich static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 401331c4ee7SVlad Yasevich { 402331c4ee7SVlad Yasevich struct sctp_ulpevent *event = sctp_skb2event(skb); 403331c4ee7SVlad Yasevich 404d55d87fdSHerbert Xu skb_orphan(skb); 405331c4ee7SVlad Yasevich skb->sk = sk; 406331c4ee7SVlad Yasevich skb->destructor = sctp_sock_rfree; 407331c4ee7SVlad Yasevich atomic_add(event->rmem_len, &sk->sk_rmem_alloc); 4084d93df0aSNeil Horman /* 4093ab224beSHideo Aoki * This mimics the behavior of skb_set_owner_r 4104d93df0aSNeil Horman */ 4114d93df0aSNeil Horman sk->sk_forward_alloc -= event->rmem_len; 412331c4ee7SVlad Yasevich } 413331c4ee7SVlad Yasevich 4141da177e4SLinus Torvalds /* Tests if the list has one and only one entry. */ 4151da177e4SLinus Torvalds static inline int sctp_list_single_entry(struct list_head *head) 4161da177e4SLinus Torvalds { 417a02cec21SEric Dumazet return (head->next != head) && (head->next == head->prev); 4181da177e4SLinus Torvalds } 4191da177e4SLinus Torvalds 4201da177e4SLinus Torvalds /* Break down data chunks at this point. */ 421f68b2e05SVlad Yasevich static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) 4221da177e4SLinus Torvalds { 423f68b2e05SVlad Yasevich struct sctp_sock *sp = sctp_sk(asoc->base.sk); 4241da177e4SLinus Torvalds int frag = pmtu; 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds frag -= sp->pf->af->net_header_len; 4271da177e4SLinus Torvalds frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 4281da177e4SLinus Torvalds 429f68b2e05SVlad Yasevich if (asoc->user_frag) 430f68b2e05SVlad Yasevich frag = min_t(int, frag, asoc->user_frag); 4311da177e4SLinus Torvalds 432659e0bcaSMarcelo Ricardo Leitner frag = WORD_TRUNC(min_t(int, frag, SCTP_MAX_CHUNK_LEN)); 4331da177e4SLinus Torvalds 4341da177e4SLinus Torvalds return frag; 4351da177e4SLinus Torvalds } 4361da177e4SLinus Torvalds 43702f3d4ceSDavid S. Miller static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc) 4388a479491SVlad Yasevich { 4398a479491SVlad Yasevich 44002f3d4ceSDavid S. Miller sctp_assoc_sync_pmtu(sk, asoc); 4418a479491SVlad Yasevich asoc->pmtu_pending = 0; 4428a479491SVlad Yasevich } 4438a479491SVlad Yasevich 444b69040d8SDaniel Borkmann static inline bool sctp_chunk_pending(const struct sctp_chunk *chunk) 445b69040d8SDaniel Borkmann { 446b69040d8SDaniel Borkmann return !list_empty(&chunk->list); 447b69040d8SDaniel Borkmann } 448b69040d8SDaniel Borkmann 4491da177e4SLinus Torvalds /* Walk through a list of TLV parameters. Don't trust the 4501da177e4SLinus Torvalds * individual parameter lengths and instead depend on 4511da177e4SLinus Torvalds * the chunk length to indicate when to stop. Make sure 4521da177e4SLinus Torvalds * there is room for a param header too. 4531da177e4SLinus Torvalds */ 4541da177e4SLinus Torvalds #define sctp_walk_params(pos, chunk, member)\ 455dd2d1c6fSVladislav Yasevich _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) 4561da177e4SLinus Torvalds 4571da177e4SLinus Torvalds #define _sctp_walk_params(pos, chunk, end, member)\ 4581da177e4SLinus Torvalds for (pos.v = chunk->member;\ 459dd2d1c6fSVladislav Yasevich pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ 4601da177e4SLinus Torvalds ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 4611da177e4SLinus Torvalds pos.v += WORD_ROUND(ntohs(pos.p->length))) 4621da177e4SLinus Torvalds 4631da177e4SLinus Torvalds #define sctp_walk_errors(err, chunk_hdr)\ 4641da177e4SLinus Torvalds _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds #define _sctp_walk_errors(err, chunk_hdr, end)\ 4671da177e4SLinus Torvalds for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 4681da177e4SLinus Torvalds sizeof(sctp_chunkhdr_t));\ 469dd2d1c6fSVladislav Yasevich (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ 4701da177e4SLinus Torvalds ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 4711da177e4SLinus Torvalds err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 4721da177e4SLinus Torvalds 4731da177e4SLinus Torvalds #define sctp_walk_fwdtsn(pos, chunk)\ 4741da177e4SLinus Torvalds _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds #define _sctp_walk_fwdtsn(pos, chunk, end)\ 4771da177e4SLinus Torvalds for (pos = chunk->subh.fwdtsn_hdr->skip;\ 4781da177e4SLinus Torvalds (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 4791da177e4SLinus Torvalds pos++) 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds /* External references. */ 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds extern struct proto sctp_prot; 4841da177e4SLinus Torvalds extern struct proto sctpv6_prot; 4851da177e4SLinus Torvalds void sctp_put_port(struct sock *sk); 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds extern struct idr sctp_assocs_id; 4881da177e4SLinus Torvalds extern spinlock_t sctp_assocs_id_lock; 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds /* Static inline functions. */ 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds /* Convert from an IP version number to an Address Family symbol. */ 4931da177e4SLinus Torvalds static inline int ipver2af(__u8 ipver) 4941da177e4SLinus Torvalds { 4951da177e4SLinus Torvalds switch (ipver) { 4961da177e4SLinus Torvalds case 4: 4971da177e4SLinus Torvalds return AF_INET; 4981da177e4SLinus Torvalds case 6: 4991da177e4SLinus Torvalds return AF_INET6; 5001da177e4SLinus Torvalds default: 5011da177e4SLinus Torvalds return 0; 502e3cc055cSJoe Perches } 5031da177e4SLinus Torvalds } 5041da177e4SLinus Torvalds 5051da177e4SLinus Torvalds /* Convert from an address parameter type to an address family. */ 506dbc16db1SAl Viro static inline int param_type2af(__be16 type) 5071da177e4SLinus Torvalds { 5081da177e4SLinus Torvalds switch (type) { 5091da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 5101da177e4SLinus Torvalds return AF_INET; 5111da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 5121da177e4SLinus Torvalds return AF_INET6; 5131da177e4SLinus Torvalds default: 5141da177e4SLinus Torvalds return 0; 515e3cc055cSJoe Perches } 5161da177e4SLinus Torvalds } 5171da177e4SLinus Torvalds 5181da177e4SLinus Torvalds /* Warning: The following hash functions assume a power of two 'size'. */ 5191da177e4SLinus Torvalds /* This is the hash function for the SCTP port hash table. */ 520f1f43763SEric W. Biederman static inline int sctp_phashfn(struct net *net, __u16 lport) 5211da177e4SLinus Torvalds { 522f1f43763SEric W. Biederman return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1); 5231da177e4SLinus Torvalds } 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds /* This is the hash function for the endpoint hash table. */ 5264cdadcbcSEric W. Biederman static inline int sctp_ep_hashfn(struct net *net, __u16 lport) 5271da177e4SLinus Torvalds { 5284cdadcbcSEric W. Biederman return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1); 5291da177e4SLinus Torvalds } 5301da177e4SLinus Torvalds 531b67bfe0dSSasha Levin #define sctp_for_each_hentry(epb, head) \ 532b67bfe0dSSasha Levin hlist_for_each_entry(epb, head, node) 533d970dbf8SVlad Yasevich 5341da177e4SLinus Torvalds /* Is a socket of this style? */ 5351da177e4SLinus Torvalds #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 5361da177e4SLinus Torvalds static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 5371da177e4SLinus Torvalds { 5381da177e4SLinus Torvalds return sctp_sk(sk)->type == style; 5391da177e4SLinus Torvalds } 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds /* Is the association in this state? */ 5421da177e4SLinus Torvalds #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 5431da177e4SLinus Torvalds static inline int __sctp_state(const struct sctp_association *asoc, 5441da177e4SLinus Torvalds sctp_state_t state) 5451da177e4SLinus Torvalds { 5461da177e4SLinus Torvalds return asoc->state == state; 5471da177e4SLinus Torvalds } 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds /* Is the socket in this state? */ 5501da177e4SLinus Torvalds #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 5511da177e4SLinus Torvalds static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 5521da177e4SLinus Torvalds { 5531da177e4SLinus Torvalds return sk->sk_state == state; 5541da177e4SLinus Torvalds } 5551da177e4SLinus Torvalds 5561da177e4SLinus Torvalds /* Map v4-mapped v6 address back to v4 address */ 5571da177e4SLinus Torvalds static inline void sctp_v6_map_v4(union sctp_addr *addr) 5581da177e4SLinus Torvalds { 5591da177e4SLinus Torvalds addr->v4.sin_family = AF_INET; 5601da177e4SLinus Torvalds addr->v4.sin_port = addr->v6.sin6_port; 5611da177e4SLinus Torvalds addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 5621da177e4SLinus Torvalds } 5631da177e4SLinus Torvalds 5641da177e4SLinus Torvalds /* Map v4 address to v4-mapped v6 address */ 5651da177e4SLinus Torvalds static inline void sctp_v4_map_v6(union sctp_addr *addr) 5661da177e4SLinus Torvalds { 5679302d7bbSJason Gunthorpe __be16 port; 5689302d7bbSJason Gunthorpe 5699302d7bbSJason Gunthorpe port = addr->v4.sin_port; 5709302d7bbSJason Gunthorpe addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 5719302d7bbSJason Gunthorpe addr->v6.sin6_port = port; 5721da177e4SLinus Torvalds addr->v6.sin6_family = AF_INET6; 573299ee123SJason Gunthorpe addr->v6.sin6_flowinfo = 0; 574299ee123SJason Gunthorpe addr->v6.sin6_scope_id = 0; 5751da177e4SLinus Torvalds addr->v6.sin6_addr.s6_addr32[0] = 0; 5761da177e4SLinus Torvalds addr->v6.sin6_addr.s6_addr32[1] = 0; 5771da177e4SLinus Torvalds addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 5781da177e4SLinus Torvalds } 5791da177e4SLinus Torvalds 580e0268868SNicolas Dichtel /* The cookie is always 0 since this is how it's used in the 581e0268868SNicolas Dichtel * pmtu code. 582e0268868SNicolas Dichtel */ 583e0268868SNicolas Dichtel static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) 584e0268868SNicolas Dichtel { 585d27fc782Sfan.du if (t->dst && !dst_check(t->dst, t->dst_cookie)) { 586e0268868SNicolas Dichtel dst_release(t->dst); 587e0268868SNicolas Dichtel t->dst = NULL; 588e0268868SNicolas Dichtel } 589e0268868SNicolas Dichtel 590e0268868SNicolas Dichtel return t->dst; 591e0268868SNicolas Dichtel } 592e0268868SNicolas Dichtel 5931da177e4SLinus Torvalds #endif /* __net_sctp_h__ */ 594