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"

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);
        AZ(H2_SEND_HELD(h2, r2));
        AZ(r2->wrk);
        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);
                }
                else {
                        H2S_Lock_VSLb(h2, SLT_Debug,
                            "H2: stream %u: write error s=%zd/%zu errno=%d",
                            stream, s, sizeof hdr + len, errno);
                }
                /*
                 * 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];
        h2_error h2e_rr = NULL;

        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);

        if (h2_rapid_reset_check(wrk, h2, r2))
                h2e_rr = h2_rapid_reset_charge(wrk, h2, r2);
        if (h2e_rr != NULL)
                h2->error = h2e_rr;
}

void
H2_Send_GOAWAY(struct worker *wrk, struct h2_sess *h2, const struct h2_req *r2,
    h2_error h2e)
{
        char b[8];

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

        if (h2->goaway)
                return;

        vbe32enc(b, h2->highest_stream);
        vbe32enc(b + 4, h2e->val);
        H2_Send_Frame(wrk, h2, H2_F_GOAWAY, 0, 8, 0, b);
        h2->goaway = 1;
}

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		static h2_error
44	5081	h2_errcheck(const struct h2_req r2, const struct h2_sess h2)
45		{
46	5081	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
47	5081	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
48
49	5081	if (r2->error != NULL)
50	803	return (r2->error);
51	4278	if (h2->error != NULL && r2->stream > h2->goaway_last_stream)
52	7	return (h2->error);
53	4271	return (NULL);
54	5081	}
55
56		static int
57	114	h2_cond_wait(pthread_cond_t cond, struct h2_sess h2, struct h2_req *r2)
58		{
59	114	vtim_dur tmo = 0.;
60		vtim_real now;
61		h2_error h2e;
62		int r;
63
64	114	AN(cond);
65	114	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
66	114	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
67
68	114	Lck_AssertHeld(&h2->sess->mtx);
69
70	114	if (cache_param->h2_window_timeout > 0.)
71	114	tmo = cache_param->h2_window_timeout;
72
73	114	r = Lck_CondWaitTimeout(cond, &h2->sess->mtx, tmo);
74	114	assert(r == 0 \|\| r == ETIMEDOUT);
75
76	114	now = VTIM_real();
77
78		/* NB: when we grab h2_window_timeout before acquiring the session
79		* lock we may time out, but once we wake up both send_timeout and
80		* h2_window_timeout may have changed meanwhile. For this reason
81		* h2_stream_tmo() may not log what timed out and we need to call
82		* again with a magic NAN "now" that indicates to h2_stream_tmo()
83		* that the stream reached the h2_window_timeout via the lock and
84		* force it to log it.
85		*/
86	114	h2e = h2_stream_tmo(h2, r2, now);
87	114	if (h2e == NULL && r == ETIMEDOUT) {
88	9	h2e = h2_stream_tmo(h2, r2, NAN);
89	9	AN(h2e);
90	9	}
91
92	114	if (r2->error == NULL)
93	105	r2->error = h2e;
94
95	114	return (h2e != NULL ? -1 : 0);
96		}
97
98		static void
99	7129	h2_send_get_locked(struct worker wrk, struct h2_sess h2, struct h2_req *r2)
100		{
101
102	7129	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
103	7129	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
104	7129	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
105
106	7129	Lck_AssertHeld(&h2->sess->mtx);
107	7129	if (&wrk->cond == h2->cond)
108	3663	ASSERT_RXTHR(h2);
109	7129	AZ(H2_SEND_HELD(h2, r2));
110	7129	AZ(r2->wrk);
111	7129	r2->wrk = wrk;
112	7129	VTAILQ_INSERT_TAIL(&h2->txqueue, r2, tx_list);
113	7211	while (!H2_SEND_HELD(h2, r2))
114	82	AZ(Lck_CondWait(&wrk->cond, &h2->sess->mtx));
115	7129	r2->wrk = NULL;
116	7129	}
117
118		void
119	7031	H2_Send_Get(struct worker wrk, struct h2_sess h2, struct h2_req *r2)
120		{
121
122	7031	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
123	7031	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
124	7031	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
125
126	7031	Lck_Lock(&h2->sess->mtx);
127	7031	h2_send_get_locked(wrk, h2, r2);
128	7031	Lck_Unlock(&h2->sess->mtx);
129	7031	}
130
131		static void
132	7130	h2_send_rel_locked(struct h2_sess h2, const struct h2_req r2)
133		{
134	7130	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
135	7130	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
136
137	7130	Lck_AssertHeld(&h2->sess->mtx);
138	7130	AN(H2_SEND_HELD(h2, r2));
139	7130	VTAILQ_REMOVE(&h2->txqueue, r2, tx_list);
140	7130	r2 = VTAILQ_FIRST(&h2->txqueue);
141	7130	if (r2 != NULL) {
142	82	CHECK_OBJ_NOTNULL(r2->wrk, WORKER_MAGIC);
143	82	PTOK(pthread_cond_signal(&r2->wrk->cond));
144	82	}
145	7130	}
146
147		void
148	7031	H2_Send_Rel(struct h2_sess h2, const struct h2_req r2)
149		{
150	7031	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
151	7031	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
152
153	7031	Lck_Lock(&h2->sess->mtx);
154	7031	h2_send_rel_locked(h2, r2);
155	7031	Lck_Unlock(&h2->sess->mtx);
156	7031	}
157
158		static void
159	6832	h2_mk_hdr(uint8_t *hdr, h2_frame ftyp, uint8_t flags,
160		uint32_t len, uint32_t stream)
161		{
162
163	6832	AN(hdr);
164	6832	assert(len < (1U << 24));
165	6832	vbe32enc(hdr, len << 8);
166	6832	hdr[3] = ftyp->type;
167	6832	hdr[4] = flags;
168	6832	vbe32enc(hdr + 5, stream);
169	6832	}
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	6832	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	6832	(void)wrk;
187
188	6832	AN(ftyp);
189	6832	AZ(flags & ~(ftyp->flags));
190	6832	if (stream == 0)
191	4410	AZ(ftyp->act_szero);
192		else
193	2422	AZ(ftyp->act_snonzero);
194
195	6832	h2_mk_hdr(hdr, ftyp, flags, len, stream);
196	6832	Lck_Lock(&h2->sess->mtx);
197	6832	VSLb_bin(h2->vsl, SLT_H2TxHdr, 9, hdr);
198	6832	h2->srq->acct.resp_hdrbytes += 9;
199	6832	if (ftyp->overhead)
200	5133	h2->srq->acct.resp_bodybytes += len;
201	6832	Lck_Unlock(&h2->sess->mtx);
202
203	6832	memset(iov, 0, sizeof iov);
204	6832	iov[0].iov_base = (void*)hdr;
205	6832	iov[0].iov_len = sizeof hdr;
206	6832	iov[1].iov_base = TRUST_ME(ptr);
207	6832	iov[1].iov_len = len;
208	6832	s = writev(h2->sess->fd, iov, len == 0 ? 1 : 2);
209	6832	if (s != sizeof hdr + len) {
210	17	if (errno == EWOULDBLOCK) {
211	0	H2S_Lock_VSLb(h2, SLT_SessError,
212	0	"H2: stream %u: Hit idle_send_timeout", stream);
213	0	}
214		else {
215	34	H2S_Lock_VSLb(h2, SLT_Debug,
216		"H2: stream %u: write error s=%zd/%zu errno=%d",
217	17	stream, s, sizeof hdr + len, errno);
218		}
219		/*
220		* There is no point in being nice here, we will be unable
221		* to send a GOAWAY once the code unrolls, so go directly
222		* to the finale and be done with it.
223		*/
224	17	h2->error = H2CE_PROTOCOL_ERROR;
225	6832	} else if (len > 0) {
226	5238	Lck_Lock(&h2->sess->mtx);
227	5238	VSLb_bin(h2->vsl, SLT_H2TxBody, len, ptr);
228	5238	Lck_Unlock(&h2->sess->mtx);
229	5238	}
230	6832	}
231
232		static int64_t
233	454	h2_win_limit(const struct h2_req r2, const struct h2_sess h2)
234		{
235
236	454	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
237	454	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
238	454	CHECK_OBJ_NOTNULL(h2->req0, H2_REQ_MAGIC);
239
240	454	Lck_AssertHeld(&h2->sess->mtx);
241	454	return (vmin_t(int64_t, r2->t_window, h2->req0->t_window));
242		}
243
244		static void
245	454	h2_win_charge(struct h2_req r2, const struct h2_sess h2, uint32_t w)
246		{
247	454	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
248	454	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
249	454	CHECK_OBJ_NOTNULL(h2->req0, H2_REQ_MAGIC);
250
251	454	Lck_AssertHeld(&h2->sess->mtx);
252	454	r2->t_window -= w;
253	454	h2->req0->t_window -= w;
254	454	}
255
256		static int64_t
257	744	h2_do_window(struct worker wrk, struct h2_req r2,
258		struct h2_sess *h2, int64_t wanted)
259		{
260	744	int64_t w = 0;
261
262	744	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
263	744	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
264	744	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
265
266	744	if (wanted == 0)
267	254	return (0);
268
269	490	Lck_Lock(&h2->sess->mtx);
270	490	if (r2->t_window <= 0 \|\| h2->req0->t_window <= 0) {
271	99	r2->t_winupd = VTIM_real();
272	99	h2_send_rel_locked(h2, r2);
273
274	99	assert(h2->winup_streams >= 0);
275	99	h2->winup_streams++;
276
277	198	while (r2->t_window <= 0 && h2_errcheck(r2, h2) == NULL) {
278	99	r2->cond = &wrk->cond;
279	99	(void)h2_cond_wait(r2->cond, h2, r2);
280	99	r2->cond = NULL;
281		}
282
283	114	while (h2->req0->t_window <= 0 && h2_errcheck(r2, h2) == NULL)
284	15	(void)h2_cond_wait(h2->winupd_cond, h2, r2);
285
286	99	if (h2_errcheck(r2, h2) == NULL) {
287	63	w = vmin_t(int64_t, h2_win_limit(r2, h2), wanted);
288	63	h2_win_charge(r2, h2, w);
289	63	assert (w > 0);
290	63	}
291
292	99	if (r2->error == H2SE_BROKE_WINDOW &&
293	18	h2->open_streams <= h2->winup_streams) {
294	0	VSLb(h2->vsl, SLT_SessError, "H2: window bankrupt");
295	0	h2->error = r2->error = H2CE_BANKRUPT;
296	0	}
297
298	99	assert(h2->winup_streams > 0);
299	99	h2->winup_streams--;
300
301	99	h2_send_get_locked(wrk, h2, r2);
302	99	}
303
304	490	if (w == 0 && h2_errcheck(r2, h2) == NULL) {
305	391	assert(r2->t_window > 0);
306	391	assert(h2->req0->t_window > 0);
307	391	w = h2_win_limit(r2, h2);
308	391	if (w > wanted)
309	328	w = wanted;
310	391	h2_win_charge(r2, h2, w);
311	391	assert (w > 0);
312	391	}
313	490	r2->t_winupd = 0;
314	490	Lck_Unlock(&h2->sess->mtx);
315	490	return (w);
316	744	}
317
318		/*
319		* This is the per-stream frame sender.
320		* XXX: priority
321		*/
322
323		static void
324	1835	h2_send(struct worker wrk, struct h2_req r2, h2_frame ftyp, uint8_t flags,
325		uint32_t len, const void ptr, uint64_t counter)
326		{
327		struct h2_sess *h2;
328		uint32_t mfs, tf;
329		const char *p;
330		uint8_t final_flags;
331
332	1835	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
333	1835	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
334	1835	h2 = r2->h2sess;
335	1835	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
336	1835	assert(len == 0 \|\| ptr != NULL);
337	1835	AN(counter);
338
339	1835	AN(H2_SEND_HELD(h2, r2));
340
341	1835	if (h2_errcheck(r2, h2) != NULL)
342	316	return;
343
344	1519	AN(ftyp);
345	1519	AZ(flags & ~(ftyp->flags));
346	1519	if (r2->stream == 0)
347	0	AZ(ftyp->act_szero);
348		else
349	1519	AZ(ftyp->act_snonzero);
350
351	1519	Lck_Lock(&h2->sess->mtx);
352	1519	mfs = h2->remote_settings.max_frame_size;
353	1519	if (r2->counted && (
354	1519	(ftyp == H2_F_HEADERS && (flags & H2FF_HEADERS_END_STREAM)) \|\|
355	582	(ftyp == H2_F_DATA && (flags & H2FF_DATA_END_STREAM)) \|\|
356	0	ftyp == H2_F_RST_STREAM
357		)) {
358	2181	assert(h2->open_streams > 0);
359	857	h2->open_streams--;
360	857	r2->counted = 0;
361	857	}
362	1519	Lck_Unlock(&h2->sess->mtx);
363
364	1519	if (ftyp->respect_window) {
365	582	tf = h2_do_window(wrk, r2, h2, (len > mfs) ? mfs : len);
366	582	if (h2_errcheck(r2, h2) != NULL)
367	0	return;
368	582	AN(H2_SEND_HELD(h2, r2));
369	582	} else
370	937	tf = mfs;
371
372	1519	if (len <= tf) {
373	1429	H2_Send_Frame(wrk, h2, ftyp, flags, len, r2->stream, ptr);
374	1429	*counter += len;
375	1429	} else {
376	90	AN(ptr);
377	90	p = ptr;
378	90	final_flags = ftyp->final_flags & flags;
379	90	flags &= ~ftyp->final_flags;
380	90	do {
381	306	AN(ftyp->continuation);
382	306	if (!ftyp->respect_window)
383	72	tf = mfs;
384	306	if (ftyp->respect_window && p != ptr) {
385	324	tf = h2_do_window(wrk, r2, h2,
386	162	(len > mfs) ? mfs : len);
387	162	if (h2_errcheck(r2, h2) != NULL)
388	36	return;
389	126	AN(H2_SEND_HELD(h2, r2));
390	126	}
391	270	if (tf < len) {
392	432	H2_Send_Frame(wrk, h2, ftyp,
393	216	flags, tf, r2->stream, p);
394	216	} else {
395	54	if (ftyp->respect_window)
396	36	assert(tf == len);
397	54	tf = len;
398	108	H2_Send_Frame(wrk, h2, ftyp, final_flags, tf,
399	54	r2->stream, p);
400	54	flags = 0;
401		}
402	270	p += tf;
403	270	len -= tf;
404	270	*counter += tf;
405	270	ftyp = ftyp->continuation;
406	270	flags &= ftyp->flags;
407	270	final_flags &= ftyp->flags;
408	270	} while (h2->error == NULL && len > 0);
409		}
410	1835	}
411
412		void
413	543	H2_Send_RST(struct worker wrk, struct h2_sess h2, const struct h2_req *r2,
414		uint32_t stream, h2_error h2e)
415		{
416		char b[4];
417	543	h2_error h2e_rr = NULL;
418
419	543	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
420	543	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
421	543	AN(H2_SEND_HELD(h2, r2));
422	543	AN(h2e);
423
424	543	H2S_Lock_VSLb(h2, SLT_Debug, "H2: stream %u: %s", stream, h2e->txt);
425	543	vbe32enc(b, h2e->val);
426
427	543	H2_Send_Frame(wrk, h2, H2_F_RST_STREAM, 0, sizeof b, stream, b);
428
429	543	if (h2_rapid_reset_check(wrk, h2, r2))
430	486	h2e_rr = h2_rapid_reset_charge(wrk, h2, r2);
431	543	if (h2e_rr != NULL)
432	9	h2->error = h2e_rr;
433	543	}
434
435		void
436	1314	H2_Send_GOAWAY(struct worker wrk, struct h2_sess h2, const struct h2_req *r2,
437		h2_error h2e)
438		{
439		char b[8];
440
441	1314	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
442	1314	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
443	1314	AN(H2_SEND_HELD(h2, r2));
444	1314	AN(h2e);
445
446	1314	if (h2->goaway)
447	0	return;
448
449	1314	vbe32enc(b, h2->highest_stream);
450	1314	vbe32enc(b + 4, h2e->val);
451	1314	H2_Send_Frame(wrk, h2, H2_F_GOAWAY, 0, 8, 0, b);
452	1314	h2->goaway = 1;
453	1314	}
454
455		void
456	1835	H2_Send(struct worker wrk, struct h2_req r2, h2_frame ftyp, uint8_t flags,
457		uint32_t len, const void ptr, uint64_t counter)
458		{
459	1835	uint64_t dummy_counter = 0;
460		h2_error h2e;
461
462	1835	if (counter == NULL)
463	526	counter = &dummy_counter;
464
465	1835	h2_send(wrk, r2, ftyp, flags, len, ptr, counter);
466
467	1835	h2e = h2_errcheck(r2, r2->h2sess);
468	1835	if (H2_ERROR_MATCH(h2e, H2SE_CANCEL))
469	45	H2_Send_RST(wrk, r2->h2sess, r2, r2->stream, h2e);
470	1835	}