FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_structs.h

     /*      $KAME: sctp_structs.h,v 1.13 2005/03/06 16:04:18 itojun Exp $   */
     /*      $NetBSD: sctp_structs.h,v 1.2 2016/04/25 21:21:02 rjs Exp $ */
     
     #ifndef __SCTP_STRUCTS_H__
     #define __SCTP_STRUCTS_H__
     
     /*
      * Copyright (c) 2001, 2002, 2003, 2004 Cisco Systems, Inc.
      * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Cisco Systems, Inc.
     * 4. Neither the name of the project nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY CISCO SYSTEMS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL CISCO SYSTEMS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    #include <sys/queue.h>
    
    #include <sys/callout.h>
    
    #ifdef IPSEC
    #include <netipsec/ipsec.h>
    #include <netipsec/key.h>
    #endif
    
    #include <netinet/sctp_header.h>
    #include <netinet/sctp_uio.h>
    
    struct sctp_timer {
            struct callout timer;
            int type;
            /*
             * Depending on the timer type these will be setup and cast with
             * the appropriate entity.
             */
            void *ep;
            void *tcb;
            void *net;
    };
    
    /*
     * This is the information we track on each interface that we know about        * from the distant end.
     */
    TAILQ_HEAD(sctpnetlisthead, sctp_nets);
    
    /*
     * Users of the iterator need to malloc a iterator with a call to
     * sctp_initiate_iterator(func, pcb_flags, asoc_state, void-ptr-arg, u_int32_t,
     *                        u_int32-arg, end_func, inp);
     *
     * Use the following two defines if you don't care what pcb flags are on the
     * EP and/or you don't care what state the association is in.
     *
     * Note that if you specify an INP as the last argument then ONLY each
     * association of that single INP will be executed upon. Note that the
     * pcb flags STILL apply so if the inp you specify has different pcb_flags
     * then what you put in pcb_flags nothing will happen. use SCTP_PCB_ANY_FLAGS
     * to assure the inp you specify gets treated.
     */
    #define SCTP_PCB_ANY_FLAGS  0x00000000
    #define SCTP_ASOC_ANY_STATE 0x00000000
    
    typedef void (*asoc_func)(struct sctp_inpcb *, struct sctp_tcb *, void *ptr,
                              u_int32_t val);
    typedef void (*end_func)(void *ptr, u_int32_t val);
    
    #define SCTP_ITERATOR_DO_ALL_INP        0x00000001
    #define SCTP_ITERATOR_DO_SINGLE_INP     0x00000002
    
    struct sctp_iterator {
            LIST_ENTRY(sctp_iterator) sctp_nxt_itr;
            struct sctp_timer tmr;
            struct sctp_inpcb *inp; /* ep */
            struct sctp_tcb *stcb;  /* assoc */
            asoc_func function_toapply;
            end_func function_atend;
            void *pointer;          /* pointer for apply func to use */
            u_int32_t val;          /* value for apply func to use */
           u_int32_t pcb_flags;
           u_int32_t asoc_state;
           u_int32_t iterator_flags;
   };
   
   LIST_HEAD(sctpiterators, sctp_iterator);
   
   struct sctp_copy_all {
           struct sctp_inpcb *inp; /* ep */
           struct mbuf *m;
           struct sctp_sndrcvinfo sndrcv;
           int sndlen;
           int cnt_sent;
           int cnt_failed;
   };
   
   union sctp_sockstore {
   #ifdef AF_INET
           struct sockaddr_in  sin;
   #endif
   #ifdef AF_INET6
           struct sockaddr_in6 sin6;
   #endif
           struct sockaddr     sa;
   };
   
   struct sctp_nets {
           TAILQ_ENTRY(sctp_nets) sctp_next;       /* next link */
   
           /* Things on the top half may be able to be split
            * into a common structure shared by all.
            */
           struct sctp_timer pmtu_timer;
   
           /*
            * The following two in combination equate to a route entry for
            * v6 or v4.
            */
   #if 0
           struct sctp_route {
                   struct rtentry *ro_rt;
                   union sctp_sockstore _l_addr;   /* remote peer addr */
                   union sctp_sockstore _s_addr;   /* our selected src addr */
           } ro;
   #endif
           struct route ro;
           /* union sctp_sockstore _l_addr; */
           union sctp_sockstore _s_addr;
           /* mtu discovered so far */
           u_int32_t mtu;
           u_int32_t ssthresh;             /* not sure about this one for split */
   
           /* smoothed average things for RTT and RTO itself */
           int lastsa;
           int lastsv;
           unsigned int RTO;
   
           /* This is used for SHUTDOWN/SHUTDOWN-ACK/SEND or INIT timers */
           struct sctp_timer rxt_timer;
   
           /* last time in seconds I sent to it */
           struct timeval last_sent_time;
           int ref_count;
   
           /* Congestion stats per destination */
           /*
            * flight size variables and such, sorry Vern, I could not avoid
            * this if I wanted performance :>
            */
           u_int32_t flight_size;
           u_int32_t cwnd; /* actual cwnd */
           u_int32_t prev_cwnd; /* cwnd before any processing */
           u_int32_t partial_bytes_acked; /* in CA tracks when to incr a MTU */
   
           /* tracking variables to avoid the aloc/free in sack processing */
           unsigned int net_ack;
           unsigned int net_ack2;
           /*
            * These only are valid if the primary dest_sstate holds the
            * SCTP_ADDR_SWITCH_PRIMARY flag
            */
           u_int32_t next_tsn_at_change;
           u_int32_t heartbeat_random1;
           u_int32_t heartbeat_random2;
   
           /* if this guy is ok or not ... status */
           u_int16_t dest_state;
           /* number of transmit failures to down this guy */
           u_int16_t failure_threshold;
           /* error stats on destination */
           u_int16_t error_count;
   
           /* Flags that probably can be combined into dest_state */
           u_int8_t rto_pending;           /* is segment marked for RTO update  ** if we split?*/
           u_int8_t fast_retran_ip;        /* fast retransmit in progress */
           u_int8_t hb_responded;
           u_int8_t cacc_saw_newack;       /* CACC algorithm flag */
           u_int8_t src_addr_selected;     /* if we split we move */
           u_int8_t indx_of_eligible_next_to_use;
           u_int8_t addr_is_local;         /* its a local address (if known) could move in split */
   #ifdef SCTP_HIGH_SPEED
           u_int8_t last_hs_used;          /* index into the last HS table entry we used */
   #endif
   };
   
   
   struct sctp_data_chunkrec {
           u_int32_t TSN_seq;  /* the TSN of this transmit */
           u_int16_t stream_seq; /* the stream sequence number of this transmit */
           u_int16_t stream_number; /* the stream number of this guy */
           u_int32_t payloadtype;
           u_int32_t context;      /* from send */
   
          /* ECN Nonce: Nonce Value for this chunk */
           u_int8_t ect_nonce;
   
           /* part of the Highest sacked algorithm to be able to
            * stroke counts on ones that are FR'd.
            */
           u_int32_t fast_retran_tsn;      /* sending_seq at the time of FR */
           struct timeval timetodrop;      /* time we drop it from queue */
           u_int8_t doing_fast_retransmit;
           u_int8_t rcv_flags; /* flags pulled from data chunk on inbound
                              * for outbound holds sending flags.
                              */
           u_int8_t state_flags;
   };
   
   TAILQ_HEAD(sctpchunk_listhead, sctp_tmit_chunk);
   
   #define CHUNK_FLAGS_FRAGMENT_OK 0x0001
   
   struct sctp_tmit_chunk {
           union {
                   struct sctp_data_chunkrec data;
                   int chunk_id;
           } rec;
           int32_t   sent;         /* the send status */
           int32_t   snd_count;                    /* number of times I sent */
           u_int32_t flags;                /* flags, such as FRAGMENT_OK */
           u_int32_t   send_size;
           u_int32_t   book_size;
           u_int32_t   mbcnt;
           struct sctp_association *asoc;  /* bp to asoc this belongs to */
           struct timeval sent_rcv_time;   /* filled in if RTT being calculated */
           struct mbuf *data;              /* pointer to mbuf chain of data */
           struct sctp_nets *whoTo;
           TAILQ_ENTRY(sctp_tmit_chunk) sctp_next; /* next link */
           uint8_t do_rtt;
   };
   
   
   /*
    * this struct contains info that is used to track inbound stream data
    * and help with ordering.
    */
   TAILQ_HEAD(sctpwheelunrel_listhead, sctp_stream_in);
   struct sctp_stream_in {
           struct sctpchunk_listhead inqueue;
           TAILQ_ENTRY(sctp_stream_in) next_spoke;
           uint16_t stream_no;
           uint16_t last_sequence_delivered;       /* used for re-order */
   };
   
   /* This struct is used to track the traffic on outbound streams */
   TAILQ_HEAD(sctpwheel_listhead, sctp_stream_out);
   struct sctp_stream_out {
           struct sctpchunk_listhead outqueue;
           TAILQ_ENTRY(sctp_stream_out) next_spoke; /* next link in wheel */
           uint16_t stream_no;
           uint16_t next_sequence_sent; /* next one I expect to send out */
   };
   
   /* used to keep track of the addresses yet to try to add/delete */
   TAILQ_HEAD(sctp_asconf_addrhead, sctp_asconf_addr);
   struct sctp_asconf_addr {
           TAILQ_ENTRY(sctp_asconf_addr) next;
           struct sctp_asconf_addr_param ap;
           struct ifaddr *ifa;     /* save the ifa for add/del ip */
           uint8_t sent;           /* has this been sent yet? */
   };
   
   
   /*
    * Here we have information about each individual association that we
    * track. We probably in production would be more dynamic. But for ease
    * of implementation we will have a fixed array that we hunt for in a
    * linear fashion.
    */
   struct sctp_association {
           /* association state */
           int state;
           /* queue of pending addrs to add/delete */
           struct sctp_asconf_addrhead asconf_queue;
           struct timeval time_entered;            /* time we entered state */
           struct timeval time_last_rcvd;
           struct timeval time_last_sent;
           struct timeval time_last_sat_advance;
           struct sctp_sndrcvinfo def_send;        /* default send parameters */
   
           /* timers and such */
           struct sctp_timer hb_timer;             /* hb timer */
           struct sctp_timer dack_timer;           /* Delayed ack timer */
           struct sctp_timer asconf_timer;         /* Asconf */
           struct sctp_timer strreset_timer;       /* stream reset */
           struct sctp_timer shut_guard_timer;     /* guard */
           struct sctp_timer autoclose_timer;      /* automatic close timer */
           struct sctp_timer delayed_event_timer;  /* timer for delayed events */
   
           /* list of local addresses when add/del in progress */
           struct sctpladdr sctp_local_addr_list;
           struct sctpnetlisthead nets;
   
           /* Control chunk queue */
           struct sctpchunk_listhead control_send_queue;
   
           /* Once a TSN hits the wire it is moved to the sent_queue. We
            * maintain two counts here (don't know if any but retran_cnt
            * is needed). The idea is that the sent_queue_retran_cnt
            * reflects how many chunks have been marked for retranmission
            * by either T3-rxt or FR.
            */
           struct sctpchunk_listhead sent_queue;
           struct sctpchunk_listhead send_queue;
   
   
           /* re-assembly queue for fragmented chunks on the inbound path */
           struct sctpchunk_listhead reasmqueue;
   
           /*
            * this queue is used when we reach a condition that we can NOT
            * put data into the socket buffer. We track the size of this
            * queue and set our rwnd to the space in the socket minus also
            * the size_on_delivery_queue.
            */
           struct sctpchunk_listhead delivery_queue;
   
           struct sctpwheel_listhead out_wheel;
   
           /* If an iterator is looking at me, this is it */
           struct sctp_iterator *stcb_starting_point_for_iterator;
   
           /* ASCONF destination address last sent to */
           struct sctp_nets *asconf_last_sent_to;
   
           /* ASCONF save the last ASCONF-ACK so we can resend it if necessary */
           struct mbuf *last_asconf_ack_sent;
   
           /*
            * if Source Address Selection happening, this will rotate through
            * the link list.
            */
           struct sctp_laddr *last_used_address;
   
           /* stream arrays */
           struct sctp_stream_in  *strmin;
           struct sctp_stream_out *strmout;
           u_int8_t *mapping_array;
           /* primary destination to use */
           struct sctp_nets *primary_destination;
   
           /* last place I got a data chunk from */
           struct sctp_nets *last_data_chunk_from;
           /* last place I got a control from */
           struct sctp_nets *last_control_chunk_from;
   
           /* circular looking for output selection */
           struct sctp_stream_out *last_out_stream;
   
           /* wait to the point the cum-ack passes
            * pending_reply->sr_resp.reset_at_tsn.
            */
           struct sctp_stream_reset_response *pending_reply;
           struct sctpchunk_listhead pending_reply_queue;
   
           u_int32_t cookie_preserve_req;
           /* ASCONF next seq I am sending out, inits at init-tsn */
           uint32_t asconf_seq_out;
           /* ASCONF last received ASCONF from peer, starts at peer's TSN-1 */
           uint32_t asconf_seq_in;
   
           /* next seq I am sending in str reset messages */
           uint32_t str_reset_seq_out;
   
           /* next seq I am expecting in str reset messages */
           uint32_t str_reset_seq_in;
           u_int32_t str_reset_sending_seq;
   
           /* various verification tag information */
           u_int32_t my_vtag;      /*
                                    * The tag to be used. if assoc is
                                    * re-initited by remote end, and
                                    * I have unlocked this will be
                                    * regenrated to a new random value.
                                    */
           u_int32_t peer_vtag;    /* The peers last tag */
   
           u_int32_t my_vtag_nonce;
           u_int32_t peer_vtag_nonce;
   
   
           /* This is the SCTP fragmentation threshold */
           u_int32_t smallest_mtu;
   
           /*
            * Special hook for Fast retransmit, allows us to track the highest
            * TSN that is NEW in this SACK if gap ack blocks are present.
            */
           u_int32_t this_sack_highest_gap;
   
           /*
            * The highest consecutive TSN that has been acked by peer on my
            * sends
            */
           u_int32_t last_acked_seq;
   
           /* The next TSN that I will use in sending. */
           u_int32_t sending_seq;
   
           /* Original seq number I used ??questionable to keep?? */
           u_int32_t init_seq_number;
   
           /*
            * We use this value to know if FR's are allowed, i.e. did the
            * cum-ack pass this point or equal it so FR's are now allowed.
            */
           u_int32_t t3timeout_highest_marked;
   
           /* The Advanced Peer Ack Point, as required by the PR-SCTP */
           /* (A1 in Section 4.2) */
           u_int32_t advanced_peer_ack_point;
   
           /*
            * The highest consequetive TSN at the bottom of the mapping
            * array (for his sends).
            */
           u_int32_t cumulative_tsn;
           /*
            * Used to track the mapping array and its offset bits. This
            * MAY be lower then cumulative_tsn.
            */
           u_int32_t mapping_array_base_tsn;
           /*
            * used to track highest TSN we have received and is listed in
            * the mapping array.
            */
           u_int32_t highest_tsn_inside_map;
   
           u_int32_t last_echo_tsn;
           u_int32_t last_cwr_tsn;
           u_int32_t fast_recovery_tsn;
           u_int32_t sat_t3_recovery_tsn;
   
           u_int32_t tsn_last_delivered;
   
           /*
            * window state information and smallest MTU that I use to bound
            * segmentation
            */
           u_int32_t peers_rwnd;
           u_int32_t my_rwnd;
           u_int32_t my_last_reported_rwnd;
           u_int32_t my_rwnd_control_len;
   
           u_int32_t total_output_queue_size;
           u_int32_t total_output_mbuf_queue_size;
   
           /* 32 bit nonce stuff */
           u_int32_t nonce_resync_tsn;
           u_int32_t nonce_wait_tsn;
   
           int ctrl_queue_cnt; /* could be removed  REM */
           /*
            * All outbound datagrams queue into this list from the
            * individual stream queue. Here they get assigned a TSN
            * and then await sending. The stream seq comes when it
            * is first put in the individual str queue
            */
           unsigned int stream_queue_cnt;
           unsigned int send_queue_cnt;
           unsigned int sent_queue_cnt;
           unsigned int sent_queue_cnt_removeable;
           /*
            * Number on sent queue that are marked for retran until this
            * value is 0 we only send one packet of retran'ed data.
            */
           unsigned int sent_queue_retran_cnt;
   
           unsigned int size_on_reasm_queue;
           unsigned int cnt_on_reasm_queue;
           /* amount of data (bytes) currently in flight (on all destinations) */
           unsigned int total_flight;
           /* Total book size in flight */
           unsigned int total_flight_count;        /* count of chunks used with book total */
           /* count of destinaton nets and list of destination nets */
           unsigned int numnets;
   
           /* Total error count on this association */
           unsigned int overall_error_count;
   
           unsigned int size_on_delivery_queue;
           unsigned int cnt_on_delivery_queue;
   
           unsigned int cnt_msg_on_sb;
   
           /* All stream count of chunks for delivery */
           unsigned int size_on_all_streams;
           unsigned int cnt_on_all_streams;
   
           /* Heart Beat delay in ticks */
           unsigned int heart_beat_delay;
   
           /* autoclose */
           unsigned int sctp_autoclose_ticks;
   
           /* how many preopen streams we have */
           unsigned int pre_open_streams;
   
           /* How many streams I support coming into me */
           unsigned int max_inbound_streams;
   
           /* the cookie life I award for any cookie, in seconds */
           unsigned int cookie_life;
   
           unsigned int numduptsns;
           int dup_tsns[SCTP_MAX_DUP_TSNS];
           unsigned int initial_init_rto_max;      /* initial RTO for INIT's */
           unsigned int initial_rto;               /* initial send RTO */
           unsigned int minrto;                    /* per assoc RTO-MIN */
           unsigned int maxrto;                    /* per assoc RTO-MAX */
           /* Being that we have no bag to collect stale cookies, and
            * that we really would not want to anyway.. we will count
            * them in this counter. We of course feed them to the
            * pigeons right away (I have always thought of pigeons
            * as flying rats).
            */
           u_int16_t stale_cookie_count;
   
           /* For the partial delivery API, if up, invoked
            * this is what last TSN I delivered
            */
           u_int16_t str_of_pdapi;
           u_int16_t ssn_of_pdapi;
   
   
           /* counts of actual built streams. Allocation may be more however */
           /* could re-arrange to optimize space here. */
           u_int16_t streamincnt;
           u_int16_t streamoutcnt;
   
           /* my maximum number of retrans of INIT and SEND */
           /* copied from SCTP but should be individually setable */
           u_int16_t max_init_times;
           u_int16_t max_send_times;
   
           u_int16_t def_net_failure;
   
           /*
            * lock flag: 0 is ok to send, 1+ (duals as a retran count) is
            * awaiting ACK
            */
           u_int16_t asconf_sent;   /* possibly removable REM */
           u_int16_t mapping_array_size;
   
           u_int16_t chunks_on_out_queue; /* total chunks floating around */
           int16_t num_send_timers_up;
           /*
            * This flag indicates that we need to send the first SACK. If
            * in place it says we have NOT yet sent a SACK and need to.
            */
           u_int8_t first_ack_sent;
   
           /* max burst after fast retransmit completes */
           u_int8_t max_burst;
   
           u_int8_t sat_network;   /* RTT is in range of sat net or greater */
           u_int8_t sat_network_lockout;/* lockout code */
           u_int8_t burst_limit_applied;   /* Burst limit in effect at last send? */
           /* flag goes on when we are doing a partial delivery api */
           u_int8_t hb_random_values[4];
           u_int8_t fragmented_delivery_inprogress;
           u_int8_t fragment_flags;
           u_int8_t hb_ect_randombit;
           u_int8_t hb_random_idx;
   
           /* ECN Nonce stuff */
           u_int8_t receiver_nonce_sum; /* nonce I sum and put in my sack */
           u_int8_t ecn_nonce_allowed;  /* Tells us if ECN nonce is on */
           u_int8_t nonce_sum_check;    /* On off switch used during re-sync */
           u_int8_t nonce_wait_for_ecne;/* flag when we expect a ECN */
           u_int8_t peer_supports_ecn_nonce;
   
           /*
            * This value, plus all other ack'd but above cum-ack is added
            * together to cross check against the bit that we have yet to
            * define (probably in the SACK).
            * When the cum-ack is updated, this sum is updated as well.
            */
           u_int8_t nonce_sum_expect_base;
           /* Flag to tell if ECN is allowed */
           u_int8_t ecn_allowed;
   
           /* flag to indicate if peer can do asconf */
           uint8_t peer_supports_asconf;
           uint8_t peer_supports_asconf_setprim; /* possibly removable REM */
           /* pr-sctp support flag */
           uint8_t peer_supports_prsctp;
   
           /* stream resets are supported by the peer */
           uint8_t peer_supports_strreset;
   
           /*
            * packet drop's are supported by the peer, we don't really care
            * about this but we bookkeep it anyway.
            */
           uint8_t peer_supports_pktdrop;
   
           /* Do we allow V6/V4? */
           u_int8_t ipv4_addr_legal;
           u_int8_t ipv6_addr_legal;
           /* Address scoping flags */
           /* scope value for IPv4 */
           u_int8_t ipv4_local_scope;
           /* scope values for IPv6 */
           u_int8_t local_scope;
           u_int8_t site_scope;
           /* loopback scope */
           u_int8_t loopback_scope;
           /* flags to handle send alternate net tracking */
           u_int8_t used_alt_onsack;
           u_int8_t used_alt_asconfack;
           u_int8_t fast_retran_loss_recovery;
           u_int8_t sat_t3_loss_recovery;
           u_int8_t dropped_special_cnt;
           u_int8_t seen_a_sack_this_pkt;
           u_int8_t stream_reset_outstanding;
           u_int8_t delayed_connection;
           u_int8_t ifp_had_enobuf;
           u_int8_t saw_sack_with_frags;
           /*
            * The mapping array is used to track out of order sequences above
            * last_acked_seq. 0 indicates packet missing 1 indicates packet
            * rec'd. We slide it up every time we raise last_acked_seq and 0
            * trailing locactions out.  If I get a TSN above the array
            * mappingArraySz, I discard the datagram and let retransmit happen.
            */
   };
   
   #endif

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