sctp_var.h

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/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * a) Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * b) 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.
 *
 * c) Neither the name of Cisco Systems, Inc. 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 THE COPYRIGHT HOLDERS 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 THE COPYRIGHT OWNER 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/cdefs.h>
__FBSDID("$FreeBSD$");
 
#ifndef _NETINET_SCTP_VAR_H_
#define _NETINET_SCTP_VAR_H_
 
#include <netinet/sctp_uio.h>
 
#if defined(_KERNEL) || defined(__Userspace__)
 
extern struct pr_usrreqs sctp_usrreqs;
 
#define sctp_feature_on(inp, feature)  (inp->sctp_features |= feature)
#define sctp_feature_off(inp, feature) (inp->sctp_features &= ~feature)
#define sctp_is_feature_on(inp, feature) ((inp->sctp_features & feature) == feature)
#define sctp_is_feature_off(inp, feature) ((inp->sctp_features & feature) == 0)
 
#define sctp_stcb_feature_on(inp, stcb, feature) {\
        if (stcb) { \
                stcb->asoc.sctp_features |= feature; \
        } else if (inp) { \
                inp->sctp_features |= feature; \
        } \
}
#define sctp_stcb_feature_off(inp, stcb, feature) {\
        if (stcb) { \
                stcb->asoc.sctp_features &= ~feature; \
        } else if (inp) { \
                inp->sctp_features &= ~feature; \
        } \
}
#define sctp_stcb_is_feature_on(inp, stcb, feature) \
        (((stcb != NULL) && \
          ((stcb->asoc.sctp_features & feature) == feature)) || \
         ((stcb == NULL) && (inp != NULL) && \
          ((inp->sctp_features & feature) == feature)))
#define sctp_stcb_is_feature_off(inp, stcb, feature) \
        (((stcb != NULL) && \
          ((stcb->asoc.sctp_features & feature) == 0)) || \
         ((stcb == NULL) && (inp != NULL) && \
          ((inp->sctp_features & feature) == 0)) || \
         ((stcb == NULL) && (inp == NULL)))
 
/* managing mobility_feature in inpcb (by micchie) */
#define sctp_mobility_feature_on(inp, feature)  (inp->sctp_mobility_features |= feature)
#define sctp_mobility_feature_off(inp, feature) (inp->sctp_mobility_features &= ~feature)
#define sctp_is_mobility_feature_on(inp, feature) (inp->sctp_mobility_features & feature)
#define sctp_is_mobility_feature_off(inp, feature) ((inp->sctp_mobility_features & feature) == 0)
 
#define sctp_maxspace(sb) (max((sb)->sb_hiwat,SCTP_MINIMAL_RWND))
 
#define sctp_sbspace(asoc, sb) ((long) ((sctp_maxspace(sb) > (asoc)->sb_cc) ? (sctp_maxspace(sb) - (asoc)->sb_cc) : 0))
 
#define sctp_sbspace_failedmsgs(sb) ((long) ((sctp_maxspace(sb) > (sb)->sb_cc) ? (sctp_maxspace(sb) - (sb)->sb_cc) : 0))
 
#define sctp_sbspace_sub(a,b) (((a) > (b)) ? ((a) - (b)) : 0)
 
/*
 * I tried to cache the readq entries at one point. But the reality
 * is that it did not add any performance since this meant we had to
 * lock the STCB on read. And at that point once you have to do an
 * extra lock, it really does not matter if the lock is in the ZONE
 * stuff or in our code. Note that this same problem would occur with
 * an mbuf cache as well so it is not really worth doing, at least
 * right now :-D
 */
#ifdef INVARIANTS
#define sctp_free_a_readq(_stcb, _readq) { \
        if ((_readq)->on_strm_q) \
                panic("On strm q stcb:%p readq:%p", (_stcb), (_readq)); \
        SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_readq), (_readq)); \
        SCTP_DECR_READQ_COUNT(); \
}
#else
#define sctp_free_a_readq(_stcb, _readq) { \
        SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_readq), (_readq)); \
        SCTP_DECR_READQ_COUNT(); \
}
#endif
 
#define sctp_alloc_a_readq(_stcb, _readq) { \
        (_readq) = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_readq), struct sctp_queued_to_read); \
        if ((_readq)) { \
             SCTP_INCR_READQ_COUNT(); \
        } \
}
 
#define sctp_free_a_strmoq(_stcb, _strmoq, _so_locked) { \
        if ((_strmoq)->holds_key_ref) { \
                sctp_auth_key_release(stcb, sp->auth_keyid, _so_locked); \
                (_strmoq)->holds_key_ref = 0; \
        } \
        SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_strmoq), (_strmoq)); \
        SCTP_DECR_STRMOQ_COUNT(); \
}
 
#define sctp_alloc_a_strmoq(_stcb, _strmoq) { \
        (_strmoq) = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_strmoq), struct sctp_stream_queue_pending); \
        if ((_strmoq)) { \
                memset(_strmoq, 0, sizeof(struct sctp_stream_queue_pending)); \
                SCTP_INCR_STRMOQ_COUNT(); \
                (_strmoq)->holds_key_ref = 0; \
        } \
}
 
#define sctp_free_a_chunk(_stcb, _chk, _so_locked) { \
        if ((_chk)->holds_key_ref) {\
                sctp_auth_key_release((_stcb), (_chk)->auth_keyid, _so_locked); \
                (_chk)->holds_key_ref = 0; \
        } \
        if (_stcb) { \
                SCTP_TCB_LOCK_ASSERT((_stcb)); \
                if ((_chk)->whoTo) { \
                        sctp_free_remote_addr((_chk)->whoTo); \
                        (_chk)->whoTo = NULL; \
                } \
                if (((_stcb)->asoc.free_chunk_cnt > SCTP_BASE_SYSCTL(sctp_asoc_free_resc_limit)) || \
                    (SCTP_BASE_INFO(ipi_free_chunks) > SCTP_BASE_SYSCTL(sctp_system_free_resc_limit))) { \
                        SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), (_chk)); \
                        SCTP_DECR_CHK_COUNT(); \
                } else { \
                        TAILQ_INSERT_TAIL(&(_stcb)->asoc.free_chunks, (_chk), sctp_next); \
                        (_stcb)->asoc.free_chunk_cnt++; \
                        atomic_add_int(&SCTP_BASE_INFO(ipi_free_chunks), 1); \
                } \
        } else { \
                SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), (_chk)); \
                SCTP_DECR_CHK_COUNT(); \
        } \
}
 
#define sctp_alloc_a_chunk(_stcb, _chk) { \
        if (TAILQ_EMPTY(&(_stcb)->asoc.free_chunks)) { \
                (_chk) = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_chunk), struct sctp_tmit_chunk); \
                if ((_chk)) { \
                        SCTP_INCR_CHK_COUNT(); \
                        (_chk)->whoTo = NULL; \
                        (_chk)->holds_key_ref = 0; \
                } \
        } else { \
                (_chk) = TAILQ_FIRST(&(_stcb)->asoc.free_chunks); \
                TAILQ_REMOVE(&(_stcb)->asoc.free_chunks, (_chk), sctp_next); \
                atomic_subtract_int(&SCTP_BASE_INFO(ipi_free_chunks), 1); \
                (_chk)->holds_key_ref = 0; \
                SCTP_STAT_INCR(sctps_cached_chk); \
                (_stcb)->asoc.free_chunk_cnt--; \
        } \
}
 
#define sctp_free_remote_addr(__net) { \
        if ((__net)) {  \
                if (SCTP_DECREMENT_AND_CHECK_REFCOUNT(&(__net)->ref_count)) { \
                        RO_NHFREE(&(__net)->ro); \
                        if ((__net)->src_addr_selected) { \
                                sctp_free_ifa((__net)->ro._s_addr); \
                                (__net)->ro._s_addr = NULL; \
                        } \
                        (__net)->src_addr_selected = 0; \
                        (__net)->dest_state &= ~SCTP_ADDR_REACHABLE; \
                        SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_net), (__net)); \
                        SCTP_DECR_RADDR_COUNT(); \
                } \
        } \
}
 
#define sctp_sbfree(ctl, stcb, sb, m) { \
        SCTP_SAVE_ATOMIC_DECREMENT(&(sb)->sb_cc, SCTP_BUF_LEN((m))); \
        SCTP_SAVE_ATOMIC_DECREMENT(&(sb)->sb_mbcnt, MSIZE); \
        if (((ctl)->do_not_ref_stcb == 0) && stcb) {\
                SCTP_SAVE_ATOMIC_DECREMENT(&(stcb)->asoc.sb_cc, SCTP_BUF_LEN((m))); \
                SCTP_SAVE_ATOMIC_DECREMENT(&(stcb)->asoc.my_rwnd_control_len, MSIZE); \
        } \
        if (SCTP_BUF_TYPE(m) != MT_DATA && SCTP_BUF_TYPE(m) != MT_HEADER && \
            SCTP_BUF_TYPE(m) != MT_OOBDATA) \
                atomic_subtract_int(&(sb)->sb_ctl,SCTP_BUF_LEN((m))); \
}
 
#define sctp_sballoc(stcb, sb, m) { \
        atomic_add_int(&(sb)->sb_cc,SCTP_BUF_LEN((m))); \
        atomic_add_int(&(sb)->sb_mbcnt, MSIZE); \
        if (stcb) { \
                atomic_add_int(&(stcb)->asoc.sb_cc, SCTP_BUF_LEN((m))); \
                atomic_add_int(&(stcb)->asoc.my_rwnd_control_len, MSIZE); \
        } \
        if (SCTP_BUF_TYPE(m) != MT_DATA && SCTP_BUF_TYPE(m) != MT_HEADER && \
            SCTP_BUF_TYPE(m) != MT_OOBDATA) \
                atomic_add_int(&(sb)->sb_ctl,SCTP_BUF_LEN((m))); \
}
 
#define sctp_ucount_incr(val) { \
        val++; \
}
 
#define sctp_ucount_decr(val) { \
        if (val > 0) { \
                val--; \
        } else { \
                val = 0; \
        } \
}
 
#define sctp_mbuf_crush(data) do { \
        struct mbuf *_m; \
        _m = (data); \
        while (_m && (SCTP_BUF_LEN(_m) == 0)) { \
                (data)  = SCTP_BUF_NEXT(_m); \
                SCTP_BUF_NEXT(_m) = NULL; \
                sctp_m_free(_m); \
                _m = (data); \
        } \
} while (0)
 
#define sctp_flight_size_decrease(tp1) do { \
        if (tp1->whoTo->flight_size >= tp1->book_size) \
                tp1->whoTo->flight_size -= tp1->book_size; \
        else \
                tp1->whoTo->flight_size = 0; \
} while (0)
 
#define sctp_flight_size_increase(tp1) do { \
        (tp1)->whoTo->flight_size += (tp1)->book_size; \
} while (0)
 
#ifdef SCTP_FS_SPEC_LOG
#define sctp_total_flight_decrease(stcb, tp1) do { \
        if (stcb->asoc.fs_index > SCTP_FS_SPEC_LOG_SIZE) \
                stcb->asoc.fs_index = 0;\
        stcb->asoc.fslog[stcb->asoc.fs_index].total_flight = stcb->asoc.total_flight; \
        stcb->asoc.fslog[stcb->asoc.fs_index].tsn = tp1->rec.data.tsn; \
        stcb->asoc.fslog[stcb->asoc.fs_index].book = tp1->book_size; \
        stcb->asoc.fslog[stcb->asoc.fs_index].sent = tp1->sent; \
        stcb->asoc.fslog[stcb->asoc.fs_index].incr = 0; \
        stcb->asoc.fslog[stcb->asoc.fs_index].decr = 1; \
        stcb->asoc.fs_index++; \
        tp1->window_probe = 0; \
        if (stcb->asoc.total_flight >= tp1->book_size) { \
                stcb->asoc.total_flight -= tp1->book_size; \
                if (stcb->asoc.total_flight_count > 0) \
                        stcb->asoc.total_flight_count--; \
        } else { \
                stcb->asoc.total_flight = 0; \
                stcb->asoc.total_flight_count = 0; \
        } \
} while (0)
 
#define sctp_total_flight_increase(stcb, tp1) do { \
        if (stcb->asoc.fs_index > SCTP_FS_SPEC_LOG_SIZE) \
                stcb->asoc.fs_index = 0;\
        stcb->asoc.fslog[stcb->asoc.fs_index].total_flight = stcb->asoc.total_flight; \
        stcb->asoc.fslog[stcb->asoc.fs_index].tsn = tp1->rec.data.tsn; \
        stcb->asoc.fslog[stcb->asoc.fs_index].book = tp1->book_size; \
        stcb->asoc.fslog[stcb->asoc.fs_index].sent = tp1->sent; \
        stcb->asoc.fslog[stcb->asoc.fs_index].incr = 1; \
        stcb->asoc.fslog[stcb->asoc.fs_index].decr = 0; \
        stcb->asoc.fs_index++; \
        (stcb)->asoc.total_flight_count++; \
        (stcb)->asoc.total_flight += (tp1)->book_size; \
} while (0)
 
#else
 
#define sctp_total_flight_decrease(stcb, tp1) do { \
        tp1->window_probe = 0; \
        if (stcb->asoc.total_flight >= tp1->book_size) { \
                stcb->asoc.total_flight -= tp1->book_size; \
                if (stcb->asoc.total_flight_count > 0) \
                        stcb->asoc.total_flight_count--; \
        } else { \
                stcb->asoc.total_flight = 0; \
                stcb->asoc.total_flight_count = 0; \
        } \
} while (0)
 
#define sctp_total_flight_increase(stcb, tp1) do { \
        (stcb)->asoc.total_flight_count++; \
        (stcb)->asoc.total_flight += (tp1)->book_size; \
} while (0)
 
#endif
 
#define SCTP_PF_ENABLED(_net) (_net->pf_threshold < _net->failure_threshold)
#define SCTP_NET_IS_PF(_net) (_net->pf_threshold < _net->error_count)
 
struct sctp_nets;
struct sctp_inpcb;
struct sctp_tcb;
struct sctphdr;
 
void sctp_close(struct socket *so);
int sctp_disconnect(struct socket *so);
void sctp_ctlinput(int, struct sockaddr *, void *);
int sctp_ctloutput(struct socket *, struct sockopt *);
#ifdef INET
void sctp_input_with_port(struct mbuf *, int, uint16_t);
int sctp_input(struct mbuf **, int *, int);
#endif
void sctp_pathmtu_adjustment(struct sctp_tcb *, uint32_t, bool);
void sctp_drain(void);
void
sctp_notify(struct sctp_inpcb *, struct sctp_tcb *, struct sctp_nets *,
    uint8_t, uint8_t, uint16_t, uint32_t);
int sctp_flush(struct socket *, int);
int sctp_shutdown(struct socket *);
int
sctp_bindx(struct socket *, int, struct sockaddr_storage *,
    int, int, struct proc *);
 
/* can't use sctp_assoc_t here */
int sctp_peeloff(struct socket *, struct socket *, int, caddr_t, int *);
int sctp_ingetaddr(struct socket *, struct sockaddr **);
int sctp_peeraddr(struct socket *, struct sockaddr **);
int sctp_listen(struct socket *, int, struct thread *);
int sctp_accept(struct socket *, struct sockaddr **);
 
#endif                          /* _KERNEL */
 
#endif                          /* !_NETINET_SCTP_VAR_H_ */