GCOV - Varnish Cache


/*-
 * Copyright (c) 2016 Varnish Software AS
 * All rights reserved.
 *
 * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 "config.h"

#include <sys/uio.h>

#include "cache/cache_varnishd.h"

#include "cache/cache_transport.h"
#include "http2/cache_http2.h"

#include "vend.h"
#include "vtim.h"

#define H2_SEND_HELD(h2, r2) (VTAILQ_FIRST(&(h2)->txqueue) == (r2))

static h2_error
h2_errcheck(const struct h2_req *r2, const struct h2_sess *h2)
{
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);

        if (r2->error != NULL)
                return (r2->error);
        if (h2->error != NULL && r2->stream > h2->goaway_last_stream)
                return (h2->error);
        return (NULL);
}

static int
h2_cond_wait(pthread_cond_t *cond, struct h2_sess *h2, struct h2_req *r2)
{
        vtim_dur tmo = 0.;
        vtim_real now;
        h2_error h2e;
        int r;

        AN(cond);
        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);

        Lck_AssertHeld(&h2->sess->mtx);

        if (cache_param->h2_window_timeout > 0.)
                tmo = cache_param->h2_window_timeout;

        r = Lck_CondWaitTimeout(cond, &h2->sess->mtx, tmo);
        assert(r == 0 || r == ETIMEDOUT);

        now = VTIM_real();

        /* NB: when we grab h2_window_timeout before acquiring the session
         * lock we may time out, but once we wake up both send_timeout and
         * h2_window_timeout may have changed meanwhile. For this reason
         * h2_stream_tmo() may not log what timed out and we need to call
         * again with a magic NAN "now" that indicates to h2_stream_tmo()
         * that the stream reached the h2_window_timeout via the lock and
         * force it to log it.
         */
        h2e = h2_stream_tmo(h2, r2, now);
        if (h2e == NULL && r == ETIMEDOUT) {
                h2e = h2_stream_tmo(h2, r2, NAN);
                AN(h2e);
        }

        if (r2->error == NULL)
                r2->error = h2e;

        return (h2e != NULL ? -1 : 0);
}

static void
h2_send_get_locked(struct worker *wrk, struct h2_sess *h2, struct h2_req *r2)
{

        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);

        Lck_AssertHeld(&h2->sess->mtx);
        if (&wrk->cond == h2->cond)
                ASSERT_RXTHR(h2);
        r2->wrk = wrk;
        VTAILQ_INSERT_TAIL(&h2->txqueue, r2, tx_list);
        while (!H2_SEND_HELD(h2, r2))
                AZ(Lck_CondWait(&wrk->cond, &h2->sess->mtx));
        r2->wrk = NULL;
}

void
H2_Send_Get(struct worker *wrk, struct h2_sess *h2, struct h2_req *r2)
{

        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);

        Lck_Lock(&h2->sess->mtx);
        h2_send_get_locked(wrk, h2, r2);
        Lck_Unlock(&h2->sess->mtx);
}

static void
h2_send_rel_locked(struct h2_sess *h2, const struct h2_req *r2)
{
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);

        Lck_AssertHeld(&h2->sess->mtx);
        AN(H2_SEND_HELD(h2, r2));
        VTAILQ_REMOVE(&h2->txqueue, r2, tx_list);
        r2 = VTAILQ_FIRST(&h2->txqueue);
        if (r2 != NULL) {
                CHECK_OBJ_NOTNULL(r2->wrk, WORKER_MAGIC);
                PTOK(pthread_cond_signal(&r2->wrk->cond));
        }
}

void
H2_Send_Rel(struct h2_sess *h2, const struct h2_req *r2)
{
        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);

        Lck_Lock(&h2->sess->mtx);
        h2_send_rel_locked(h2, r2);
        Lck_Unlock(&h2->sess->mtx);
}

static void
h2_mk_hdr(uint8_t *hdr, h2_frame ftyp, uint8_t flags,
    uint32_t len, uint32_t stream)
{

        AN(hdr);
        assert(len < (1U << 24));
        vbe32enc(hdr, len << 8);
        hdr[3] = ftyp->type;
        hdr[4] = flags;
        vbe32enc(hdr + 5, stream);
}

/*
 * This is the "raw" frame sender, all per-stream accounting and
 * prioritization must have happened before this is called, and
 * the session mtx must be held.
 */

void
H2_Send_Frame(struct worker *wrk, struct h2_sess *h2,
    h2_frame ftyp, uint8_t flags,
    uint32_t len, uint32_t stream, const void *ptr)
{
        uint8_t hdr[9];
        ssize_t s;
        struct iovec iov[2];

        (void)wrk;

        AN(ftyp);
        AZ(flags & ~(ftyp->flags));
        if (stream == 0)
                AZ(ftyp->act_szero);
        else
                AZ(ftyp->act_snonzero);

        h2_mk_hdr(hdr, ftyp, flags, len, stream);
        Lck_Lock(&h2->sess->mtx);
        VSLb_bin(h2->vsl, SLT_H2TxHdr, 9, hdr);
        h2->srq->acct.resp_hdrbytes += 9;
        if (ftyp->overhead)
                h2->srq->acct.resp_bodybytes += len;
        Lck_Unlock(&h2->sess->mtx);

        memset(iov, 0, sizeof iov);
        iov[0].iov_base = (void*)hdr;
        iov[0].iov_len = sizeof hdr;
        iov[1].iov_base = TRUST_ME(ptr);
        iov[1].iov_len = len;
        s = writev(h2->sess->fd, iov, len == 0 ? 1 : 2);
        if (s != sizeof hdr + len) {
                if (errno == EWOULDBLOCK) {
                        H2S_Lock_VSLb(h2, SLT_SessError,
                             "H2: stream %u: Hit idle_send_timeout", stream);
                }
                /*
                 * There is no point in being nice here, we will be unable
                 * to send a GOAWAY once the code unrolls, so go directly
                 * to the finale and be done with it.
                 */
                h2->error = H2CE_PROTOCOL_ERROR;
        } else if (len > 0) {
                Lck_Lock(&h2->sess->mtx);
                VSLb_bin(h2->vsl, SLT_H2TxBody, len, ptr);
                Lck_Unlock(&h2->sess->mtx);
        }
}

static int64_t
h2_win_limit(const struct h2_req *r2, const struct h2_sess *h2)
{

        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(h2->req0, H2_REQ_MAGIC);

        Lck_AssertHeld(&h2->sess->mtx);
        return (vmin_t(int64_t, r2->t_window, h2->req0->t_window));
}

static void
h2_win_charge(struct h2_req *r2, const struct h2_sess *h2, uint32_t w)
{
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(h2->req0, H2_REQ_MAGIC);

        Lck_AssertHeld(&h2->sess->mtx);
        r2->t_window -= w;
        h2->req0->t_window -= w;
}

static int64_t
h2_do_window(struct worker *wrk, struct h2_req *r2,
    struct h2_sess *h2, int64_t wanted)
{
        int64_t w = 0;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);

        if (wanted == 0)
                return (0);

        Lck_Lock(&h2->sess->mtx);
        if (r2->t_window <= 0 || h2->req0->t_window <= 0) {
                r2->t_winupd = VTIM_real();
                h2_send_rel_locked(h2, r2);

                assert(h2->winup_streams >= 0);
                h2->winup_streams++;

                while (r2->t_window <= 0 && h2_errcheck(r2, h2) == NULL) {
                        r2->cond = &wrk->cond;
                        (void)h2_cond_wait(r2->cond, h2, r2);
                        r2->cond = NULL;
                }

                while (h2->req0->t_window <= 0 && h2_errcheck(r2, h2) == NULL)
                        (void)h2_cond_wait(h2->winupd_cond, h2, r2);

                if (h2_errcheck(r2, h2) == NULL) {
                        w = vmin_t(int64_t, h2_win_limit(r2, h2), wanted);
                        h2_win_charge(r2, h2, w);
                        assert (w > 0);
                }

                if (r2->error == H2SE_BROKE_WINDOW &&
                    h2->open_streams <= h2->winup_streams) {
                        VSLb(h2->vsl, SLT_SessError, "H2: window bankrupt");
                        h2->error = r2->error = H2CE_BANKRUPT;
                    }

                assert(h2->winup_streams > 0);
                h2->winup_streams--;

                h2_send_get_locked(wrk, h2, r2);
        }

        if (w == 0 && h2_errcheck(r2, h2) == NULL) {
                assert(r2->t_window > 0);
                assert(h2->req0->t_window > 0);
                w = h2_win_limit(r2, h2);
                if (w > wanted)
                        w = wanted;
                h2_win_charge(r2, h2, w);
                assert (w > 0);
        }
        r2->t_winupd = 0;
        Lck_Unlock(&h2->sess->mtx);
        return (w);
}

/*
 * This is the per-stream frame sender.
 * XXX: priority
 */

static void
h2_send(struct worker *wrk, struct h2_req *r2, h2_frame ftyp, uint8_t flags,
    uint32_t len, const void *ptr, uint64_t *counter)
{
        struct h2_sess *h2;
        uint32_t mfs, tf;
        const char *p;
        uint8_t final_flags;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        h2 = r2->h2sess;
        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        assert(len == 0 || ptr != NULL);
        AN(counter);

        AN(H2_SEND_HELD(h2, r2));

        if (h2_errcheck(r2, h2) != NULL)
                return;

        AN(ftyp);
        AZ(flags & ~(ftyp->flags));
        if (r2->stream == 0)
                AZ(ftyp->act_szero);
        else
                AZ(ftyp->act_snonzero);

        Lck_Lock(&h2->sess->mtx);
        mfs = h2->remote_settings.max_frame_size;
        if (r2->counted && (
            (ftyp == H2_F_HEADERS && (flags & H2FF_HEADERS_END_STREAM)) ||
            (ftyp == H2_F_DATA && (flags & H2FF_DATA_END_STREAM)) ||
            ftyp == H2_F_RST_STREAM
            )) {
                assert(h2->open_streams > 0);
                h2->open_streams--;
                r2->counted = 0;
        }
        Lck_Unlock(&h2->sess->mtx);

        if (ftyp->respect_window) {
                tf = h2_do_window(wrk, r2, h2, (len > mfs) ? mfs : len);
                if (h2_errcheck(r2, h2) != NULL)
                        return;
                AN(H2_SEND_HELD(h2, r2));
        } else
                tf = mfs;

        if (len <= tf) {
                H2_Send_Frame(wrk, h2, ftyp, flags, len, r2->stream, ptr);
                *counter += len;
        } else {
                AN(ptr);
                p = ptr;
                final_flags = ftyp->final_flags & flags;
                flags &= ~ftyp->final_flags;
                do {
                        AN(ftyp->continuation);
                        if (!ftyp->respect_window)
                                tf = mfs;
                        if (ftyp->respect_window && p != ptr) {
                                tf = h2_do_window(wrk, r2, h2,
                                    (len > mfs) ? mfs : len);
                                if (h2_errcheck(r2, h2) != NULL)
                                        return;
                                AN(H2_SEND_HELD(h2, r2));
                        }
                        if (tf < len) {
                                H2_Send_Frame(wrk, h2, ftyp,
                                    flags, tf, r2->stream, p);
                        } else {
                                if (ftyp->respect_window)
                                        assert(tf == len);
                                tf = len;
                                H2_Send_Frame(wrk, h2, ftyp, final_flags, tf,
                                    r2->stream, p);
                                flags = 0;
                        }
                        p += tf;
                        len -= tf;
                        *counter += tf;
                        ftyp = ftyp->continuation;
                        flags &= ftyp->flags;
                        final_flags &= ftyp->flags;
                } while (h2->error == NULL && len > 0);
        }
}

void
H2_Send_RST(struct worker *wrk, struct h2_sess *h2, const struct h2_req *r2,
    uint32_t stream, h2_error h2e)
{
        char b[4];

        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        AN(H2_SEND_HELD(h2, r2));
        AN(h2e);

        H2S_Lock_VSLb(h2, SLT_Debug, "H2: stream %u: %s", stream, h2e->txt);
        vbe32enc(b, h2e->val);

        H2_Send_Frame(wrk, h2, H2_F_RST_STREAM, 0, sizeof b, stream, b);
}

void
H2_Send(struct worker *wrk, struct h2_req *r2, h2_frame ftyp, uint8_t flags,
    uint32_t len, const void *ptr, uint64_t *counter)
{
        uint64_t dummy_counter = 0;
        h2_error h2e;

        if (counter == NULL)
                counter = &dummy_counter;

        h2_send(wrk, r2, ftyp, flags, len, ptr, counter);

        h2e = h2_errcheck(r2, r2->h2sess);
        if (H2_ERROR_MATCH(h2e, H2SE_CANCEL))
                H2_Send_RST(wrk, r2->h2sess, r2, r2->stream, h2e);
}

		varnish-cache/bin/varnishd/http2/cache_http2_send.c
0		/*-
1		* Copyright (c) 2016 Varnish Software AS
2		* All rights reserved.
3		*
4		* Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
5		*
6		* SPDX-License-Identifier: BSD-2-Clause
7		*
8		* Redistribution and use in source and binary forms, with or without
9		* modification, are permitted provided that the following conditions
10		* are met:
11		* 1. Redistributions of source code must retain the above copyright
12		* notice, this list of conditions and the following disclaimer.
13		* 2. Redistributions in binary form must reproduce the above copyright
14		* notice, this list of conditions and the following disclaimer in the
15		* documentation and/or other materials provided with the distribution.
16		*
17		* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18		* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20		* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
21		* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22		* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23		* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25		* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27		* SUCH DAMAGE.
28		*
29		*/
30
31		#include "config.h"
32
33		#include <sys/uio.h>
34
35		#include "cache/cache_varnishd.h"
36
37		#include "cache/cache_transport.h"
38		#include "http2/cache_http2.h"
39
40		#include "vend.h"
41		#include "vtim.h"
42
43		#define H2_SEND_HELD(h2, r2) (VTAILQ_FIRST(&(h2)->txqueue) == (r2))
44
45		static h2_error
46	20571	h2_errcheck(const struct h2_req r2, const struct h2_sess h2)
47		{
48	20571	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
49	20571	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
50
51	20571	if (r2->error != NULL)
52	3164	return (r2->error);
53	17407	if (h2->error != NULL && r2->stream > h2->goaway_last_stream)
54	42	return (h2->error);
55	17365	return (NULL);
56	20571	}
57
58		static int
59	500	h2_cond_wait(pthread_cond_t cond, struct h2_sess h2, struct h2_req *r2)
60		{
61	500	vtim_dur tmo = 0.;
62		vtim_real now;
63		h2_error h2e;
64		int r;
65
66	500	AN(cond);
67	500	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
68	500	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
69
70	500	Lck_AssertHeld(&h2->sess->mtx);
71
72	500	if (cache_param->h2_window_timeout > 0.)
73	500	tmo = cache_param->h2_window_timeout;
74
75	500	r = Lck_CondWaitTimeout(cond, &h2->sess->mtx, tmo);
76	500	assert(r == 0 \|\| r == ETIMEDOUT);
77
78	500	now = VTIM_real();
79
80		/* NB: when we grab h2_window_timeout before acquiring the session
81		* lock we may time out, but once we wake up both send_timeout and
82		* h2_window_timeout may have changed meanwhile. For this reason
83		* h2_stream_tmo() may not log what timed out and we need to call
84		* again with a magic NAN "now" that indicates to h2_stream_tmo()
85		* that the stream reached the h2_window_timeout via the lock and
86		* force it to log it.
87		*/
88	500	h2e = h2_stream_tmo(h2, r2, now);
89	500	if (h2e == NULL && r == ETIMEDOUT) {
90	40	h2e = h2_stream_tmo(h2, r2, NAN);
91	40	AN(h2e);
92	40	}
93
94	500	if (r2->error == NULL)
95	460	r2->error = h2e;
96
97	500	return (h2e != NULL ? -1 : 0);
98		}
99
100		static void
101	28661	h2_send_get_locked(struct worker wrk, struct h2_sess h2, struct h2_req *r2)
102		{
103
104	28661	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
105	28661	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
106	28661	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
107
108	28661	Lck_AssertHeld(&h2->sess->mtx);
109	28661	if (&wrk->cond == h2->cond)
110	14719	ASSERT_RXTHR(h2);
111	28661	r2->wrk = wrk;
112	28661	VTAILQ_INSERT_TAIL(&h2->txqueue, r2, tx_list);
113	28986	while (!H2_SEND_HELD(h2, r2))
114	325	AZ(Lck_CondWait(&wrk->cond, &h2->sess->mtx));
115	28661	r2->wrk = NULL;
116	28661	}
117
118		void
119	28220	H2_Send_Get(struct worker wrk, struct h2_sess h2, struct h2_req *r2)
120		{
121
122	28220	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
123	28220	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
124	28220	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
125
126	28220	Lck_Lock(&h2->sess->mtx);
127	28220	h2_send_get_locked(wrk, h2, r2);
128	28220	Lck_Unlock(&h2->sess->mtx);
129	28220	}
130
131		static void
132	28662	h2_send_rel_locked(struct h2_sess h2, const struct h2_req r2)
133		{
134	28662	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
135	28662	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
136
137	28662	Lck_AssertHeld(&h2->sess->mtx);
138	28662	AN(H2_SEND_HELD(h2, r2));
139	28662	VTAILQ_REMOVE(&h2->txqueue, r2, tx_list);
140	28662	r2 = VTAILQ_FIRST(&h2->txqueue);
141	28662	if (r2 != NULL) {
142	325	CHECK_OBJ_NOTNULL(r2->wrk, WORKER_MAGIC);
143	325	PTOK(pthread_cond_signal(&r2->wrk->cond));
144	325	}
145	28662	}
146
147		void
148	28222	H2_Send_Rel(struct h2_sess h2, const struct h2_req r2)
149		{
150	28222	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
151	28222	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
152
153	28222	Lck_Lock(&h2->sess->mtx);
154	28222	h2_send_rel_locked(h2, r2);
155	28222	Lck_Unlock(&h2->sess->mtx);
156	28222	}
157
158		static void
159	28014	h2_mk_hdr(uint8_t *hdr, h2_frame ftyp, uint8_t flags,
160		uint32_t len, uint32_t stream)
161		{
162
163	28014	AN(hdr);
164	28014	assert(len < (1U << 24));
165	28014	vbe32enc(hdr, len << 8);
166	28014	hdr[3] = ftyp->type;
167	28014	hdr[4] = flags;
168	28014	vbe32enc(hdr + 5, stream);
169	28014	}
170
171		/*
172		* This is the "raw" frame sender, all per-stream accounting and
173		* prioritization must have happened before this is called, and
174		* the session mtx must be held.
175		*/
176
177		void
178	28014	H2_Send_Frame(struct worker wrk, struct h2_sess h2,
179		h2_frame ftyp, uint8_t flags,
180		uint32_t len, uint32_t stream, const void *ptr)
181		{
182		uint8_t hdr[9];
183		ssize_t s;
184		struct iovec iov[2];
185
186	28014	(void)wrk;
187
188	28014	AN(ftyp);
189	28014	AZ(flags & ~(ftyp->flags));
190	28014	if (stream == 0)
191	18199	AZ(ftyp->act_szero);
192		else
193	9815	AZ(ftyp->act_snonzero);
194
195	28014	h2_mk_hdr(hdr, ftyp, flags, len, stream);
196	28014	Lck_Lock(&h2->sess->mtx);
197	28014	VSLb_bin(h2->vsl, SLT_H2TxHdr, 9, hdr);
198	28014	h2->srq->acct.resp_hdrbytes += 9;
199	28014	if (ftyp->overhead)
200	21268	h2->srq->acct.resp_bodybytes += len;
201	28014	Lck_Unlock(&h2->sess->mtx);
202
203	28014	memset(iov, 0, sizeof iov);
204	28014	iov[0].iov_base = (void*)hdr;
205	28014	iov[0].iov_len = sizeof hdr;
206	28014	iov[1].iov_base = TRUST_ME(ptr);
207	28014	iov[1].iov_len = len;
208	28014	s = writev(h2->sess->fd, iov, len == 0 ? 1 : 2);
209	28014	if (s != sizeof hdr + len) {
210	96	if (errno == EWOULDBLOCK) {
211	0	H2S_Lock_VSLb(h2, SLT_SessError,
212	0	"H2: stream %u: Hit idle_send_timeout", stream);
213	0	}
214		/*
215		* There is no point in being nice here, we will be unable
216		* to send a GOAWAY once the code unrolls, so go directly
217		* to the finale and be done with it.
218		*/
219	96	h2->error = H2CE_PROTOCOL_ERROR;
220	28014	} else if (len > 0) {
221	21350	Lck_Lock(&h2->sess->mtx);
222	21350	VSLb_bin(h2->vsl, SLT_H2TxBody, len, ptr);
223	21350	Lck_Unlock(&h2->sess->mtx);
224	21350	}
225	28014	}
226
227		static int64_t
228	2017	h2_win_limit(const struct h2_req r2, const struct h2_sess h2)
229		{
230
231	2017	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
232	2017	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
233	2017	CHECK_OBJ_NOTNULL(h2->req0, H2_REQ_MAGIC);
234
235	2017	Lck_AssertHeld(&h2->sess->mtx);
236	2017	return (vmin_t(int64_t, r2->t_window, h2->req0->t_window));
237		}
238
239		static void
240	2017	h2_win_charge(struct h2_req r2, const struct h2_sess h2, uint32_t w)
241		{
242	2017	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
243	2017	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
244	2017	CHECK_OBJ_NOTNULL(h2->req0, H2_REQ_MAGIC);
245
246	2017	Lck_AssertHeld(&h2->sess->mtx);
247	2017	r2->t_window -= w;
248	2017	h2->req0->t_window -= w;
249	2017	}
250
251		static int64_t
252	3306	h2_do_window(struct worker wrk, struct h2_req r2,
253		struct h2_sess *h2, int64_t wanted)
254		{
255	3306	int64_t w = 0;
256
257	3306	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
258	3306	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
259	3306	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
260
261	3306	if (wanted == 0)
262	1129	return (0);
263
264	2177	Lck_Lock(&h2->sess->mtx);
265	2177	if (r2->t_window <= 0 \|\| h2->req0->t_window <= 0) {
266	440	r2->t_winupd = VTIM_real();
267	440	h2_send_rel_locked(h2, r2);
268
269	440	assert(h2->winup_streams >= 0);
270	440	h2->winup_streams++;
271
272	880	while (r2->t_window <= 0 && h2_errcheck(r2, h2) == NULL) {
273	440	r2->cond = &wrk->cond;
274	440	(void)h2_cond_wait(r2->cond, h2, r2);
275	440	r2->cond = NULL;
276		}
277
278	500	while (h2->req0->t_window <= 0 && h2_errcheck(r2, h2) == NULL)
279	60	(void)h2_cond_wait(h2->winupd_cond, h2, r2);
280
281	440	if (h2_errcheck(r2, h2) == NULL) {
282	280	w = vmin_t(int64_t, h2_win_limit(r2, h2), wanted);
283	280	h2_win_charge(r2, h2, w);
284	280	assert (w > 0);
285	280	}
286
287	440	if (r2->error == H2SE_BROKE_WINDOW &&
288	80	h2->open_streams <= h2->winup_streams) {
289	0	VSLb(h2->vsl, SLT_SessError, "H2: window bankrupt");
290	0	h2->error = r2->error = H2CE_BANKRUPT;
291	0	}
292
293	440	assert(h2->winup_streams > 0);
294	440	h2->winup_streams--;
295
296	440	h2_send_get_locked(wrk, h2, r2);
297	440	}
298
299	2177	if (w == 0 && h2_errcheck(r2, h2) == NULL) {
300	1737	assert(r2->t_window > 0);
301	1737	assert(h2->req0->t_window > 0);
302	1737	w = h2_win_limit(r2, h2);
303	1737	if (w > wanted)
304	1457	w = wanted;
305	1737	h2_win_charge(r2, h2, w);
306	1737	assert (w > 0);
307	1737	}
308	2177	r2->t_winupd = 0;
309	2177	Lck_Unlock(&h2->sess->mtx);
310	2177	return (w);
311	3306	}
312
313		/*
314		* This is the per-stream frame sender.
315		* XXX: priority
316		*/
317
318		static void
319	7154	h2_send(struct worker wrk, struct h2_req r2, h2_frame ftyp, uint8_t flags,
320		uint32_t len, const void ptr, uint64_t counter)
321		{
322		struct h2_sess *h2;
323		uint32_t mfs, tf;
324		const char *p;
325		uint8_t final_flags;
326
327	7154	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
328	7154	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
329	7154	h2 = r2->h2sess;
330	7154	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
331	7154	assert(len == 0 \|\| ptr != NULL);
332	7154	AN(counter);
333
334	7154	AN(H2_SEND_HELD(h2, r2));
335
336	7154	if (h2_errcheck(r2, h2) != NULL)
337	1208	return;
338
339	5946	AN(ftyp);
340	5946	AZ(flags & ~(ftyp->flags));
341	5946	if (r2->stream == 0)
342	0	AZ(ftyp->act_szero);
343		else
344	5946	AZ(ftyp->act_snonzero);
345
346	5946	Lck_Lock(&h2->sess->mtx);
347	5946	mfs = h2->remote_settings.max_frame_size;
348	5946	if (r2->counted && (
349	5946	(ftyp == H2_F_HEADERS && (flags & H2FF_HEADERS_END_STREAM)) \|\|
350	2586	(ftyp == H2_F_DATA && (flags & H2FF_DATA_END_STREAM)) \|\|
351	0	ftyp == H2_F_RST_STREAM
352		)) {
353	8883	assert(h2->open_streams > 0);
354	3009	h2->open_streams--;
355	3009	r2->counted = 0;
356	3009	}
357	5946	Lck_Unlock(&h2->sess->mtx);
358
359	5946	if (ftyp->respect_window) {
360	2586	tf = h2_do_window(wrk, r2, h2, (len > mfs) ? mfs : len);
361	2586	if (h2_errcheck(r2, h2) != NULL)
362	0	return;
363	2586	AN(H2_SEND_HELD(h2, r2));
364	2586	} else
365	3360	tf = mfs;
366
367	5946	if (len <= tf) {
368	5546	H2_Send_Frame(wrk, h2, ftyp, flags, len, r2->stream, ptr);
369	5546	*counter += len;
370	5546	} else {
371	400	AN(ptr);
372	400	p = ptr;
373	400	final_flags = ftyp->final_flags & flags;
374	400	flags &= ~ftyp->final_flags;
375	400	do {
376	1360	AN(ftyp->continuation);
377	1360	if (!ftyp->respect_window)
378	320	tf = mfs;
379	1360	if (ftyp->respect_window && p != ptr) {
380	1440	tf = h2_do_window(wrk, r2, h2,
381	720	(len > mfs) ? mfs : len);
382	720	if (h2_errcheck(r2, h2) != NULL)
383	160	return;
384	560	AN(H2_SEND_HELD(h2, r2));
385	560	}
386	1200	if (tf < len) {
387	1920	H2_Send_Frame(wrk, h2, ftyp,
388	960	flags, tf, r2->stream, p);
389	960	} else {
390	240	if (ftyp->respect_window)
391	160	assert(tf == len);
392	240	tf = len;
393	480	H2_Send_Frame(wrk, h2, ftyp, final_flags, tf,
394	240	r2->stream, p);
395	240	flags = 0;
396		}
397	1200	p += tf;
398	1200	len -= tf;
399	1200	*counter += tf;
400	1200	ftyp = ftyp->continuation;
401	1200	flags &= ftyp->flags;
402	1200	final_flags &= ftyp->flags;
403	1200	} while (h2->error == NULL && len > 0);
404		}
405	7154	}
406
407		void
408	2268	H2_Send_RST(struct worker wrk, struct h2_sess h2, const struct h2_req *r2,
409		uint32_t stream, h2_error h2e)
410		{
411		char b[4];
412
413	2268	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
414	2268	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
415	2268	AN(H2_SEND_HELD(h2, r2));
416	2268	AN(h2e);
417
418	2268	H2S_Lock_VSLb(h2, SLT_Debug, "H2: stream %u: %s", stream, h2e->txt);
419	2268	vbe32enc(b, h2e->val);
420
421	2268	H2_Send_Frame(wrk, h2, H2_F_RST_STREAM, 0, sizeof b, stream, b);
422	2268	}
423
424		void
425	7154	H2_Send(struct worker wrk, struct h2_req r2, h2_frame ftyp, uint8_t flags,
426		uint32_t len, const void ptr, uint64_t counter)
427		{
428	7154	uint64_t dummy_counter = 0;
429		h2_error h2e;
430
431	7154	if (counter == NULL)
432	2137	counter = &dummy_counter;
433
434	7154	h2_send(wrk, r2, ftyp, flags, len, ptr, counter);
435
436	7154	h2e = h2_errcheck(r2, r2->h2sess);
437	7154	if (H2_ERROR_MATCH(h2e, H2SE_CANCEL))
438	200	H2_Send_RST(wrk, r2->h2sess, r2, r2->stream, h2e);
439	7154	}