GCOV - Varnish Cache


/*-
 * Copyright (c) 2016-2019 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 "cache/cache_varnishd.h"

#include <stdio.h>
#include <stdlib.h>

#include "cache/cache_transport.h"
#include "cache/cache_filter.h"
#include "http2/cache_http2.h"
#include "cache/cache_objhead.h"
#include "storage/storage.h"

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

#define H2_CUSTOM_ERRORS
#define H2EC1(U,v,g,r,d)        \
        const struct h2_error_s H2CE_##U[1] = {{#U,d,v,0,1,g,r}};
#define H2EC2(U,v,g,r,d)        \
        const struct h2_error_s H2SE_##U[1] = {{#U,d,v,1,0,g,r}};
#define H2EC3(U,v,g,r,d) H2EC1(U,v,g,r,d) H2EC2(U,v,g,r,d)
#define H2_ERROR(NAME, val, sc, goaway, reason, desc)   \
        H2EC##sc(NAME, val, goaway, reason, desc)
#include "tbl/h2_error.h"
#undef H2EC1
#undef H2EC2
#undef H2EC3

static const struct h2_error_s H2NN_ERROR[1] = {{
        "UNKNOWN_ERROR",
        "Unknown error number",
        0xffffffff,
        1,
        1,
        0,
        SC_RX_JUNK
}};

enum h2frame {
#define H2_FRAME(l,u,t,f,...)   H2F_##u = t,
#include "tbl/h2_frames.h"
};

static const char *
h2_framename(enum h2frame h2f)
{

        switch (h2f) {
#define H2_FRAME(l,u,t,f,...)   case H2F_##u: return (#u);
#include "tbl/h2_frames.h"
        default:
                return (NULL);
        }
}

#define H2_FRAME_FLAGS(l,u,v)   const uint8_t H2FF_##u = v;
#include "tbl/h2_frames.h"

/**********************************************************************
 */

static const h2_error stream_errors[] = {
#define H2EC1(U,v,g,r,d)
#define H2EC2(U,v,g,r,d) [v] = H2SE_##U,
#define H2EC3(U,v,g,r,d) H2EC1(U,v,g,r,d) H2EC2(U,v,g,r,d)
#define H2_ERROR(NAME, val, sc, goaway, reason, desc)   \
        H2EC##sc(NAME, val, goaway, reason, desc)
#include "tbl/h2_error.h"
#undef H2EC1
#undef H2EC2
#undef H2EC3
};

#define NSTREAMERRORS (sizeof(stream_errors)/sizeof(stream_errors[0]))

static h2_error
h2_streamerror(uint32_t u)
{
        if (u < NSTREAMERRORS && stream_errors[u] != NULL)
                return (stream_errors[u]);
        else
                return (H2NN_ERROR);
}

/**********************************************************************
 */

static const h2_error conn_errors[] = {
#define H2EC1(U,v,g,r,d) [v] = H2CE_##U,
#define H2EC2(U,v,g,r,d)
#define H2EC3(U,v,g,r,d) H2EC1(U,v,g,r,d) H2EC2(U,v,g,r,d)
#define H2_ERROR(NAME, val, sc, goaway, reason, desc)   \
        H2EC##sc(NAME, val, goaway, reason, desc)
#include "tbl/h2_error.h"
#undef H2EC1
#undef H2EC2
#undef H2EC3
};

#define NCONNERRORS (sizeof(conn_errors)/sizeof(conn_errors[0]))

static h2_error
h2_connectionerror(uint32_t u)
{
        if (u < NCONNERRORS && conn_errors[u] != NULL)
                return (conn_errors[u]);
        else
                return (H2NN_ERROR);
}

/**********************************************************************/

struct h2_req *
h2_new_req(struct h2_sess *h2, unsigned stream, struct req *req)
{
        struct h2_req *r2;

        ASSERT_RXTHR(h2);
        if (req == NULL)
                req = Req_New(h2->sess);
        CHECK_OBJ_NOTNULL(req, REQ_MAGIC);

        r2 = WS_Alloc(req->ws, sizeof *r2);
        AN(r2);
        INIT_OBJ(r2, H2_REQ_MAGIC);
        r2->state = H2_S_IDLE;
        r2->h2sess = h2;
        r2->stream = stream;
        r2->req = req;
        if (stream)
                r2->counted = 1;
        r2->r_window = h2->local_settings.initial_window_size;
        r2->t_window = h2->remote_settings.initial_window_size;
        req->transport_priv = r2;
        Lck_Lock(&h2->sess->mtx);
        if (stream)
                h2->open_streams++;
        VTAILQ_INSERT_TAIL(&h2->streams, r2, list);
        Lck_Unlock(&h2->sess->mtx);
        h2->refcnt++;
        return (r2);
}

void
h2_del_req(struct worker *wrk, struct h2_req *r2)
{
        struct h2_sess *h2;
        struct sess *sp;
        struct stv_buffer *stvbuf;

        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        AZ(r2->scheduled);
        h2 = r2->h2sess;
        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        ASSERT_RXTHR(h2);
        sp = h2->sess;
        Lck_Lock(&sp->mtx);
        assert(h2->refcnt > 0);
        --h2->refcnt;
        /* XXX: PRIORITY reshuffle */
        VTAILQ_REMOVE(&h2->streams, r2, list);
        Lck_Unlock(&sp->mtx);

        assert(!WS_IsReserved(r2->req->ws));
        AZ(r2->req->ws->r);

        CHECK_OBJ_ORNULL(r2->rxbuf, H2_RXBUF_MAGIC);
        if (r2->rxbuf) {
                stvbuf = r2->rxbuf->stvbuf;
                r2->rxbuf = NULL;
                STV_FreeBuf(wrk, &stvbuf);
                AZ(stvbuf);
        }

        Req_Cleanup(sp, wrk, r2->req);
        if (FEATURE(FEATURE_BUSY_STATS_RATE))
                WRK_AddStat(wrk);
        Req_Release(r2->req);
}

void
h2_kill_req(struct worker *wrk, struct h2_sess *h2,
    struct h2_req *r2, h2_error h2e)
{

        ASSERT_RXTHR(h2);
        AN(h2e);
        Lck_Lock(&h2->sess->mtx);
        VSLb(h2->vsl, SLT_Debug, "KILL st=%u state=%d sched=%d",
            r2->stream, r2->state, r2->scheduled);
        if (r2->counted) {
                assert(h2->open_streams > 0);
                h2->open_streams--;
                r2->counted = 0;
        }
        if (r2->error == NULL)
                r2->error = h2e;
        if (r2->scheduled) {
                if (r2->cond != NULL)
                        PTOK(pthread_cond_signal(r2->cond));
                r2 = NULL;
                Lck_Unlock(&h2->sess->mtx);
        } else {
                Lck_Unlock(&h2->sess->mtx);
                if (r2->state == H2_S_OPEN && h2->new_req == r2->req)
                        (void)h2h_decode_hdr_fini(h2);
        }
        if (r2 != NULL)
                h2_del_req(wrk, r2);
}

/**********************************************************************/

static void
h2_vsl_frame(const struct h2_sess *h2, const void *ptr, size_t len)
{
        const uint8_t *b;
        struct vsb *vsb;
        const char *p;
        unsigned u;

        if (VSL_tag_is_masked(SLT_H2RxHdr) &&
            VSL_tag_is_masked(SLT_H2RxBody))
                return;

        AN(ptr);
        assert(len >= 9);
        b = ptr;

        vsb = VSB_new_auto();
        AN(vsb);
        p = h2_framename((enum h2frame)b[3]);
        if (p != NULL)
                VSB_cat(vsb, p);
        else
                VSB_quote(vsb, b + 3, 1, VSB_QUOTE_HEX);

        u = vbe32dec(b) >> 8;
        VSB_printf(vsb, "[%u] ", u);
        VSB_quote(vsb, b + 4, 1, VSB_QUOTE_HEX);
        VSB_putc(vsb, ' ');
        VSB_quote(vsb, b + 5, 4, VSB_QUOTE_HEX);
        if (u > 0) {
                VSB_putc(vsb, ' ');
                VSB_quote(vsb, b + 9, len - 9, VSB_QUOTE_HEX);
        }
        AZ(VSB_finish(vsb));
        Lck_Lock(&h2->sess->mtx);
        VSLb_bin(h2->vsl, SLT_H2RxHdr, 9, b);
        if (len > 9)
                VSLb_bin(h2->vsl, SLT_H2RxBody, len - 9, b + 9);

        VSLb(h2->vsl, SLT_Debug, "H2RXF %s", VSB_data(vsb));
        Lck_Unlock(&h2->sess->mtx);
        VSB_destroy(&vsb);
}


/**********************************************************************
 */

static h2_error v_matchproto_(h2_rxframe_f)
h2_rx_ping(struct worker *wrk, struct h2_sess *h2, struct h2_req *r2)
{

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        ASSERT_RXTHR(h2);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        assert(r2 == h2->req0);

        if (h2->rxf_len != 8) {                         // rfc7540,l,2364,2366
                H2S_Lock_VSLb(h2, SLT_SessError, "H2: rx ping with (len != 8)");
                return (H2CE_FRAME_SIZE_ERROR);
        }
        AZ(h2->rxf_stream);                             // rfc7540,l,2359,2362
        if (h2->rxf_flags != 0) {                       // We never send pings
                H2S_Lock_VSLb(h2, SLT_SessError, "H2: rx ping ack");
                return (H2SE_PROTOCOL_ERROR);
        }
        H2_Send_Get(wrk, h2, r2);
        H2_Send_Frame(wrk, h2,
            H2_F_PING, H2FF_PING_ACK, 8, 0, h2->rxf_data);
        H2_Send_Rel(h2, r2);
        return (0);
}

/**********************************************************************
 */

static h2_error v_matchproto_(h2_rxframe_f)
h2_rx_push_promise(struct worker *wrk, struct h2_sess *h2, struct h2_req *r2)
{

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        ASSERT_RXTHR(h2);
        CHECK_OBJ_ORNULL(r2, H2_REQ_MAGIC);
        // rfc7540,l,2262,2267
        H2S_Lock_VSLb(h2, SLT_SessError, "H2: rx push promise");
        return (H2CE_PROTOCOL_ERROR);
}

/**********************************************************************
 */

static h2_error
h2_rapid_reset(struct worker *wrk, struct h2_sess *h2, struct h2_req *r2)
{
        vtim_real now;
        vtim_dur d;

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

        if (h2->rapid_reset_limit == 0)
                return (0);

        now = VTIM_real();
        CHECK_OBJ_NOTNULL(r2->req, REQ_MAGIC);
        AN(r2->req->t_first);
        if (now - r2->req->t_first > h2->rapid_reset)
                return (0);

        d = now - h2->last_rst;
        h2->rst_budget += h2->rapid_reset_limit * d /
            h2->rapid_reset_period;
        h2->rst_budget = vmin_t(double, h2->rst_budget,
            h2->rapid_reset_limit);
        h2->last_rst = now;

        if (h2->rst_budget < 1.0) {
                H2S_Lock_VSLb(h2, SLT_SessError, "H2: Hit RST limit. Closing session.");
                return (H2CE_RAPID_RESET);
        }
        h2->rst_budget -= 1.0;
        return (0);
}

static h2_error v_matchproto_(h2_rxframe_f)
h2_rx_rst_stream(struct worker *wrk, struct h2_sess *h2, struct h2_req *r2)
{
        h2_error h2e;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        ASSERT_RXTHR(h2);
        CHECK_OBJ_ORNULL(r2, H2_REQ_MAGIC);

        if (h2->rxf_len != 4) {                 // rfc7540,l,2003,2004
                H2S_Lock_VSLb(h2, SLT_SessError, "H2: rx rst with (len != 4)");
                return (H2CE_FRAME_SIZE_ERROR);
        }
        if (r2 == NULL)
                return (0);
        h2e = h2_rapid_reset(wrk, h2, r2);
        h2_kill_req(wrk, h2, r2, h2_streamerror(vbe32dec(h2->rxf_data)));
        return (h2e);
}

/**********************************************************************
 */

static h2_error v_matchproto_(h2_rxframe_f)
h2_rx_goaway(struct worker *wrk, struct h2_sess *h2, struct h2_req *r2)
{

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        ASSERT_RXTHR(h2);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        assert(r2 == h2->req0);

        h2->goaway = 1;
        h2->goaway_last_stream = vbe32dec(h2->rxf_data);
        h2->error = h2_connectionerror(vbe32dec(h2->rxf_data + 4));
        H2S_Lock_VSLb(h2, SLT_Debug, "GOAWAY %s", h2->error->name);
        return (h2->error);
}

static void
h2_tx_goaway(struct worker *wrk, struct h2_sess *h2, h2_error h2e)
{
        char b[8];

        ASSERT_RXTHR(h2);
        AN(h2e);

        if (h2->goaway || !h2e->send_goaway)
                return;

        h2->goaway = 1;
        vbe32enc(b, h2->highest_stream);
        vbe32enc(b + 4, h2e->val);
        H2_Send_Get(wrk, h2, h2->req0);
        H2_Send_Frame(wrk, h2, H2_F_GOAWAY, 0, 8, 0, b);
        H2_Send_Rel(h2, h2->req0);
}

/**********************************************************************
 */

static h2_error v_matchproto_(h2_rxframe_f)
h2_rx_window_update(struct worker *wrk, struct h2_sess *h2, struct h2_req *r2)
{
        uint32_t wu;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        ASSERT_RXTHR(h2);
        CHECK_OBJ_ORNULL(r2, H2_REQ_MAGIC);

        if (h2->rxf_len != 4) {
                H2S_Lock_VSLb(h2, SLT_SessError, "H2: rx winup with (len != 4)");
                return (H2CE_FRAME_SIZE_ERROR);
        }
        wu = vbe32dec(h2->rxf_data) & ~(1LU<<31);
        if (wu == 0)
                return (H2SE_PROTOCOL_ERROR);
        if (r2 == NULL)
                return (0);
        Lck_Lock(&h2->sess->mtx);
        r2->t_window += wu;
        if (r2 == h2->req0)
                PTOK(pthread_cond_broadcast(h2->winupd_cond));
        else if (r2->cond != NULL)
                PTOK(pthread_cond_signal(r2->cond));
        Lck_Unlock(&h2->sess->mtx);
        if (r2->t_window >= (1LL << 31))
                return (H2SE_FLOW_CONTROL_ERROR);
        return (0);
}

/**********************************************************************
 * Incoming PRIORITY, possibly an ACK of one we sent.
 */

static h2_error v_matchproto_(h2_rxframe_f)
h2_rx_priority(struct worker *wrk, struct h2_sess *h2, struct h2_req *r2)
{

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        ASSERT_RXTHR(h2);
        CHECK_OBJ_ORNULL(r2, H2_REQ_MAGIC);
        return (0);
}

/**********************************************************************
 * Incoming SETTINGS, possibly an ACK of one we sent.
 */

#define H2_SETTING(U,l, ...)                                    \
static void v_matchproto_(h2_setsetting_f)                      \
h2_setting_##l(struct h2_settings* s, uint32_t v)               \
{                                                               \
        s -> l = v;                                             \
}
#include <tbl/h2_settings.h>

#define H2_SETTING(U, l, ...)                                   \
const struct h2_setting_s H2_SET_##U[1] = {{                    \
        #l,                                                     \
        h2_setting_##l,                                         \
        __VA_ARGS__                                             \
}};
#include <tbl/h2_settings.h>

static const struct h2_setting_s * const h2_setting_tbl[] = {
#define H2_SETTING(U,l,v, ...) [v] = H2_SET_##U,
#include <tbl/h2_settings.h>
};

#define H2_SETTING_TBL_LEN (sizeof(h2_setting_tbl)/sizeof(h2_setting_tbl[0]))

static void
h2_win_adjust(const struct h2_sess *h2, uint32_t oldval, uint32_t newval)
{
        struct h2_req *r2;

        Lck_AssertHeld(&h2->sess->mtx);
        // rfc7540,l,2668,2674
        VTAILQ_FOREACH(r2, &h2->streams, list) {
                CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
                if (r2 == h2->req0)
                        continue; // rfc7540,l,2699,2699
                switch (r2->state) {
                case H2_S_IDLE:
                case H2_S_OPEN:
                case H2_S_CLOS_REM:
                        /*
                         * We allow a window to go negative, as per
                         * rfc7540,l,2676,2680
                         */
                        r2->t_window += (int64_t)newval - oldval;
                        break;
                default:
                        break;
                }
        }
}

h2_error
h2_set_setting(struct h2_sess *h2, const uint8_t *d)
{
        const struct h2_setting_s *s;
        uint16_t x;
        uint32_t y;

        x = vbe16dec(d);
        y = vbe32dec(d + 2);
        if (x >= H2_SETTING_TBL_LEN || h2_setting_tbl[x] == NULL) {
                // rfc7540,l,2181,2182
                H2S_Lock_VSLb(h2, SLT_Debug,
                    "H2SETTING unknown setting 0x%04x=%08x (ignored)", x, y);
                return (0);
        }
        s = h2_setting_tbl[x];
        AN(s);
        if (y < s->minval || y > s->maxval) {
                H2S_Lock_VSLb(h2, SLT_Debug, "H2SETTING invalid %s=0x%08x",
                    s->name, y);
                AN(s->range_error);
                if (!DO_DEBUG(DBG_H2_NOCHECK))
                        return (s->range_error);
        }
        Lck_Lock(&h2->sess->mtx);
        if (s == H2_SET_INITIAL_WINDOW_SIZE)
                h2_win_adjust(h2, h2->remote_settings.initial_window_size, y);
        VSLb(h2->vsl, SLT_Debug, "H2SETTING %s=0x%08x", s->name, y);
        Lck_Unlock(&h2->sess->mtx);
        AN(s->setfunc);
        s->setfunc(&h2->remote_settings, y);
        return (0);
}

static h2_error v_matchproto_(h2_rxframe_f)
h2_rx_settings(struct worker *wrk, struct h2_sess *h2, struct h2_req *r2)
{
        const uint8_t *p;
        unsigned l;
        h2_error retval = 0;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        ASSERT_RXTHR(h2);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        assert(r2 == h2->req0);
        AZ(h2->rxf_stream);

        if (h2->rxf_flags == H2FF_SETTINGS_ACK) {
                if (h2->rxf_len > 0) {                  // rfc7540,l,2047,2049
                        H2S_Lock_VSLb(h2, SLT_SessError, "H2: rx settings ack with "
                            "(len > 0)");
                        return (H2CE_FRAME_SIZE_ERROR);
                }
                return (0);
        } else {
                if (h2->rxf_len % 6) {                  // rfc7540,l,2062,2064
                        H2S_Lock_VSLb(h2, SLT_SessError, "H2: rx settings with "
                            "((len %% 6) != 0)");
                        return (H2CE_PROTOCOL_ERROR);
                }
                p = h2->rxf_data;
                for (l = h2->rxf_len; l >= 6; l -= 6, p += 6) {
                        retval = h2_set_setting(h2, p);
                        if (retval)
                                return (retval);
                }
                H2_Send_Get(wrk, h2, r2);
                H2_Send_Frame(wrk, h2,
                    H2_F_SETTINGS, H2FF_SETTINGS_ACK, 0, 0, NULL);
                H2_Send_Rel(h2, r2);
        }
        return (0);
}

/**********************************************************************
 * Incoming HEADERS, this is where the party's at...
 */

void v_matchproto_(task_func_t)
h2_do_req(struct worker *wrk, void *priv)
{
        struct req *req;
        struct h2_req *r2;
        struct h2_sess *h2;

        CAST_OBJ_NOTNULL(req, priv, REQ_MAGIC);
        CAST_OBJ_NOTNULL(r2, req->transport_priv, H2_REQ_MAGIC);
        THR_SetRequest(req);
        CNT_Embark(wrk, req);

        if (CNT_Request(req) != REQ_FSM_DISEMBARK) {
                wrk->stats->client_req++;
                assert(!WS_IsReserved(req->ws));
                AZ(req->top->vcl0);
                h2 = r2->h2sess;
                CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
                Lck_Lock(&h2->sess->mtx);
                r2->scheduled = 0;
                r2->state = H2_S_CLOSED;
                r2->h2sess->do_sweep = 1;
                Lck_Unlock(&h2->sess->mtx);
        }
        THR_SetRequest(NULL);
}

static h2_error
h2_end_headers(struct worker *wrk, struct h2_sess *h2,
    struct req *req, struct h2_req *r2)
{
        h2_error h2e;
        ssize_t cl;

        ASSERT_RXTHR(h2);
        assert(r2->state == H2_S_OPEN);
        h2e = h2h_decode_hdr_fini(h2);
        h2->new_req = NULL;
        if (h2e != NULL) {
                H2S_Lock_VSLb(h2, SLT_Debug, "HPACK/FINI %s", h2e->name);
                assert(!WS_IsReserved(r2->req->ws));
                h2_del_req(wrk, r2);
                return (h2e);
        }
        VSLb_ts_req(req, "Req", req->t_req);

        // XXX: Smarter to do this already at HPACK time into tail end of
        // XXX: WS, then copy back once all headers received.
        // XXX: Have I mentioned H/2 Is hodge-podge ?
        http_CollectHdrSep(req->http, H_Cookie, "; ");  // rfc7540,l,3114,3120

        cl = http_GetContentLength(req->http);
        assert(cl >= -2);
        if (cl == -2) {
                H2S_Lock_VSLb(h2, SLT_Debug, "Non-parseable Content-Length");
                return (H2SE_PROTOCOL_ERROR);
        }

        if (req->req_body_status == NULL) {
                if (cl == -1)
                        req->req_body_status = BS_EOF;
                else {
                        /* Note: If cl==0 here, we still need to have
                         * req_body_status==BS_LENGTH, so that there will
                         * be a wait for the stream to reach H2_S_CLOS_REM
                         * while dealing with the request body. */
                        req->req_body_status = BS_LENGTH;
                }
                /* Set req->htc->content_length because this is used as
                 * the hint in vrb_pull() for how large the storage
                 * buffers need to be */
                req->htc->content_length = cl;
        } else {
                /* A HEADER frame contained END_STREAM */
                assert (req->req_body_status == BS_NONE);
                r2->state = H2_S_CLOS_REM;
                if (cl > 0) {
                        H2S_Lock_VSLb(h2, SLT_SessError, "H2: rx header with END_STREAM "
                            "and content-length > 0");
                        return (H2CE_PROTOCOL_ERROR); //rfc7540,l,1838,1840
                }
        }

        if (req->http->hd[HTTP_HDR_METHOD].b == NULL) {
                H2S_Lock_VSLb(h2, SLT_Debug, "Missing :method");
                return (H2SE_PROTOCOL_ERROR); //rfc7540,l,3087,3090
        }

        if (req->http->hd[HTTP_HDR_URL].b == NULL) {
                H2S_Lock_VSLb(h2, SLT_Debug, "Missing :path");
                return (H2SE_PROTOCOL_ERROR); //rfc7540,l,3087,3090
        }

        AN(req->http->hd[HTTP_HDR_PROTO].b);

        if (*req->http->hd[HTTP_HDR_URL].b == '*' &&
            (Tlen(req->http->hd[HTTP_HDR_METHOD]) != 7 ||
            strncmp(req->http->hd[HTTP_HDR_METHOD].b, "OPTIONS", 7))) {
                H2S_Lock_VSLb(h2, SLT_BogoHeader, "Illegal :path pseudo-header");
                return (H2SE_PROTOCOL_ERROR); //rfc7540,l,3068,3071
        }

        assert(req->req_step == R_STP_TRANSPORT);
        VCL_TaskEnter(req->privs);
        VCL_TaskEnter(req->top->privs);
        req->task->func = h2_do_req;
        req->task->priv = req;
        r2->scheduled = 1;
        if (Pool_Task(wrk->pool, req->task, TASK_QUEUE_STR) != 0) {
                r2->scheduled = 0;
                r2->state = H2_S_CLOSED;
                return (H2SE_REFUSED_STREAM); //rfc7540,l,3326,3329
        }
        return (0);
}

static h2_error v_matchproto_(h2_rxframe_f)
h2_rx_headers(struct worker *wrk, struct h2_sess *h2, struct h2_req *r2)
{
        struct req *req;
        h2_error h2e;
        const uint8_t *p;
        size_t l;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        ASSERT_RXTHR(h2);

        if (r2 == NULL) {
                if (h2->rxf_stream <= h2->highest_stream) {
                        H2S_Lock_VSLb(h2, SLT_SessError, "H2: new stream ID < highest stream");
                        return (H2CE_PROTOCOL_ERROR);   // rfc7540,l,1153,1158
                }
                /* NB: we don't need to guard the read of h2->open_streams
                 * because headers are handled sequentially so it cannot
                 * increase under our feet.
                 */
                if (h2->open_streams >=
                    (int)h2->local_settings.max_concurrent_streams) {
                        H2S_Lock_VSLb(h2, SLT_Debug,
                             "H2: stream %u: Hit maximum number of "
                             "concurrent streams", h2->rxf_stream);
                        return (H2SE_REFUSED_STREAM);   // rfc7540,l,1200,1205
                }
                h2->highest_stream = h2->rxf_stream;
                r2 = h2_new_req(h2, h2->rxf_stream, NULL);
        }
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);

        if (r2->state != H2_S_IDLE) {
                H2S_Lock_VSLb(h2, SLT_SessError, "H2: rx headers on non-idle stream");
                return (H2CE_PROTOCOL_ERROR);   // XXX spec ?
        }
        r2->state = H2_S_OPEN;

        req = r2->req;
        CHECK_OBJ_NOTNULL(req, REQ_MAGIC);

        req->vsl->wid = VXID_Get(wrk, VSL_CLIENTMARKER);
        VSLb(req->vsl, SLT_Begin, "req %ju rxreq", VXID(req->sp->vxid));
        VSL(SLT_Link, req->sp->vxid, "req %ju rxreq", VXID(req->vsl->wid));

        h2->new_req = req;
        req->sp = h2->sess;
        req->transport = &HTTP2_transport;

        req->t_first = VTIM_real();
        req->t_req = VTIM_real();
        req->t_prev = req->t_first;
        VSLb_ts_req(req, "Start", req->t_first);
        req->acct.req_hdrbytes += h2->rxf_len;

        HTTP_Setup(req->http, req->ws, req->vsl, SLT_ReqMethod);
        http_SetH(req->http, HTTP_HDR_PROTO, "HTTP/2.0");

        h2h_decode_hdr_init(h2);

        p = h2->rxf_data;
        l = h2->rxf_len;
        if (h2->rxf_flags & H2FF_HEADERS_PADDED) {
                if (*p + 1 > l) {
                        H2S_Lock_VSLb(h2, SLT_SessError, "H2: rx headers with pad length > frame len");
                        return (H2CE_PROTOCOL_ERROR);   // rfc7540,l,1884,1887
                }
                l -= 1 + *p;
                p += 1;
        }
        if (h2->rxf_flags & H2FF_HEADERS_PRIORITY) {
                if (l < 5) {
                        H2S_Lock_VSLb(h2, SLT_SessError, "H2: rx headers with incorrect "
                            "priority data");
                        return (H2CE_PROTOCOL_ERROR);
                }
                l -= 5;
                p += 5;
        }
        h2e = h2h_decode_bytes(h2, p, l);
        if (h2e != NULL) {
                H2S_Lock_VSLb(h2, SLT_Debug, "HPACK(hdr) %s", h2e->name);
                (void)h2h_decode_hdr_fini(h2);
                assert(!WS_IsReserved(r2->req->ws));
                h2_del_req(wrk, r2);
                return (h2e);
        }

        if (h2->rxf_flags & H2FF_HEADERS_END_STREAM)
                req->req_body_status = BS_NONE;

        if (h2->rxf_flags & H2FF_HEADERS_END_HEADERS)
                return (h2_end_headers(wrk, h2, req, r2));
        return (0);
}

/**********************************************************************/

static h2_error v_matchproto_(h2_rxframe_f)
h2_rx_continuation(struct worker *wrk, struct h2_sess *h2, struct h2_req *r2)
{
        struct req *req;
        h2_error h2e;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        ASSERT_RXTHR(h2);
        CHECK_OBJ_ORNULL(r2, H2_REQ_MAGIC);

        if (r2 == NULL || r2->state != H2_S_OPEN || r2->req != h2->new_req) {
                H2S_Lock_VSLb(h2, SLT_SessError, "H2: rx unexpected CONT frame"
                    " on stream %d", h2->rxf_stream);
                return (H2CE_PROTOCOL_ERROR);   // XXX spec ?
        }
        req = r2->req;
        h2e = h2h_decode_bytes(h2, h2->rxf_data, h2->rxf_len);
        r2->req->acct.req_hdrbytes += h2->rxf_len;
        if (h2e != NULL) {
                H2S_Lock_VSLb(h2, SLT_Debug, "HPACK(cont) %s", h2e->name);
                (void)h2h_decode_hdr_fini(h2);
                assert(!WS_IsReserved(r2->req->ws));
                h2_del_req(wrk, r2);
                return (h2e);
        }
        if (h2->rxf_flags & H2FF_HEADERS_END_HEADERS)
                return (h2_end_headers(wrk, h2, req, r2));
        return (0);
}

/**********************************************************************/

static h2_error v_matchproto_(h2_rxframe_f)
h2_rx_data(struct worker *wrk, struct h2_sess *h2, struct h2_req *r2)
{
        char buf[4];
        ssize_t l;
        uint64_t l2, head;
        const uint8_t *src;
        unsigned len;

        /* XXX: Shouldn't error handling, setting of r2->error and
         * r2->cond signalling be handled more generally at the end of
         * procframe()??? */

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        ASSERT_RXTHR(h2);
        CHECK_OBJ_ORNULL(r2, H2_REQ_MAGIC);

        if (r2 == NULL)
                return (0);

        if (r2->state >= H2_S_CLOS_REM) {
                r2->error = H2SE_STREAM_CLOSED;
                return (H2SE_STREAM_CLOSED); // rfc7540,l,1766,1769
        }

        Lck_Lock(&h2->sess->mtx);
        CHECK_OBJ_ORNULL(r2->rxbuf, H2_RXBUF_MAGIC);

        if (h2->error != NULL || r2->error != NULL) {
                if (r2->cond)
                        PTOK(pthread_cond_signal(r2->cond));
                Lck_Unlock(&h2->sess->mtx);
                return (h2->error != NULL ? h2->error : r2->error);
        }

        /* Check padding if present */
        src = h2->rxf_data;
        len = h2->rxf_len;
        if (h2->rxf_flags & H2FF_DATA_PADDED) {
                if (*src >= len) {
                        VSLb(h2->vsl, SLT_SessError,
                            "H2: stream %u: Padding larger than frame length",
                            h2->rxf_stream);
                        r2->error = H2CE_PROTOCOL_ERROR;
                        if (r2->cond)
                                PTOK(pthread_cond_signal(r2->cond));
                        Lck_Unlock(&h2->sess->mtx);
                        return (H2CE_PROTOCOL_ERROR);
                }
                len -= 1 + *src;
                src += 1;
        }

        /* Check against the Content-Length header if given */
        if (r2->req->htc->content_length >= 0) {
                if (r2->rxbuf)
                        l = r2->rxbuf->head;
                else
                        l = 0;
                l += len;
                if (l > r2->req->htc->content_length ||
                    ((h2->rxf_flags & H2FF_DATA_END_STREAM) &&
                     l != r2->req->htc->content_length)) {
                        VSLb(h2->vsl, SLT_Debug,
                            "H2: stream %u: Received data and Content-Length"
                            " mismatch", h2->rxf_stream);
                        r2->error = H2SE_PROTOCOL_ERROR;
                        if (r2->cond)
                                PTOK(pthread_cond_signal(r2->cond));
                        Lck_Unlock(&h2->sess->mtx);
                        return (H2SE_PROTOCOL_ERROR);
                }
        }

        /* Check and charge connection window. The entire frame including
         * padding (h2->rxf_len) counts towards the window. */
        if (h2->rxf_len > h2->req0->r_window) {
                VSLb(h2->vsl, SLT_SessError,
                    "H2: stream %u: Exceeded connection receive window",
                    h2->rxf_stream);
                r2->error = H2CE_FLOW_CONTROL_ERROR;
                if (r2->cond)
                        PTOK(pthread_cond_signal(r2->cond));
                Lck_Unlock(&h2->sess->mtx);
                return (H2CE_FLOW_CONTROL_ERROR);
        }
        h2->req0->r_window -= h2->rxf_len;
        if (h2->req0->r_window < cache_param->h2_rx_window_low_water) {
                h2->req0->r_window += cache_param->h2_rx_window_increment;
                vbe32enc(buf, cache_param->h2_rx_window_increment);
                Lck_Unlock(&h2->sess->mtx);
                H2_Send_Get(wrk, h2, h2->req0);
                H2_Send_Frame(wrk, h2, H2_F_WINDOW_UPDATE, 0, 4, 0, buf);
                H2_Send_Rel(h2, h2->req0);
                Lck_Lock(&h2->sess->mtx);
        }

        /* Check stream window. The entire frame including padding
         * (h2->rxf_len) counts towards the window. */
        if (h2->rxf_len > r2->r_window) {
                VSLb(h2->vsl, SLT_Debug,
                    "H2: stream %u: Exceeded stream receive window",
                    h2->rxf_stream);
                r2->error = H2SE_FLOW_CONTROL_ERROR;
                if (r2->cond)
                        PTOK(pthread_cond_signal(r2->cond));
                Lck_Unlock(&h2->sess->mtx);
                return (H2SE_FLOW_CONTROL_ERROR);
        }

        /* Handle zero size frame before starting to allocate buffers */
        if (len == 0) {
                r2->r_window -= h2->rxf_len;

                /* Handle the specific corner case where the entire window
                 * has been exhausted using nothing but padding
                 * bytes. Since no bytes have been buffered, no bytes
                 * would be consumed by the request thread and no stream
                 * window updates sent. Unpaint ourselves from this corner
                 * by sending a stream window update here. */
                CHECK_OBJ_ORNULL(r2->rxbuf, H2_RXBUF_MAGIC);
                if (r2->r_window == 0 &&
                    (r2->rxbuf == NULL || r2->rxbuf->tail == r2->rxbuf->head)) {
                        if (r2->rxbuf)
                                l = r2->rxbuf->size;
                        else
                                l = h2->local_settings.initial_window_size;
                        r2->r_window += l;
                        Lck_Unlock(&h2->sess->mtx);
                        vbe32enc(buf, l);
                        H2_Send_Get(wrk, h2, h2->req0);
                        H2_Send_Frame(wrk, h2, H2_F_WINDOW_UPDATE, 0, 4,
                            r2->stream, buf);
                        H2_Send_Rel(h2, h2->req0);
                        Lck_Lock(&h2->sess->mtx);
                }

                if (h2->rxf_flags & H2FF_DATA_END_STREAM)
                        r2->state = H2_S_CLOS_REM;
                if (r2->cond)
                        PTOK(pthread_cond_signal(r2->cond));
                Lck_Unlock(&h2->sess->mtx);
                return (0);
        }

        /* Make the buffer on demand */
        if (r2->rxbuf == NULL) {
                unsigned bufsize;
                size_t bstest;
                struct stv_buffer *stvbuf;
                struct h2_rxbuf *rxbuf;

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

                bufsize = h2->local_settings.initial_window_size;
                if (bufsize < r2->r_window) {
                        /* This will not happen because we do not have any
                         * mechanism to change the initial window size on
                         * a running session. But if we gain that ability,
                         * this future proofs it. */
                        bufsize = r2->r_window;
                }
                assert(bufsize > 0);
                if ((h2->rxf_flags & H2FF_DATA_END_STREAM) &&
                    bufsize > len)
                        /* Cap the buffer size when we know this is the
                         * single data frame. */
                        bufsize = len;
                CHECK_OBJ_NOTNULL(stv_h2_rxbuf, STEVEDORE_MAGIC);
                stvbuf = STV_AllocBuf(wrk, stv_h2_rxbuf,
                    bufsize + sizeof *rxbuf);
                if (stvbuf == NULL) {
                        Lck_Lock(&h2->sess->mtx);
                        VSLb(h2->vsl, SLT_Debug,
                            "H2: stream %u: Failed to allocate request body"
                            " buffer",
                            h2->rxf_stream);
                        r2->error = H2SE_INTERNAL_ERROR;
                        if (r2->cond)
                                PTOK(pthread_cond_signal(r2->cond));
                        Lck_Unlock(&h2->sess->mtx);
                        return (H2SE_INTERNAL_ERROR);
                }
                rxbuf = STV_GetBufPtr(stvbuf, &bstest);
                AN(rxbuf);
                assert(bstest >= bufsize + sizeof *rxbuf);
                assert(PAOK(rxbuf));
                INIT_OBJ(rxbuf, H2_RXBUF_MAGIC);
                rxbuf->size = bufsize;
                rxbuf->stvbuf = stvbuf;

                r2->rxbuf = rxbuf;

                Lck_Lock(&h2->sess->mtx);
        }

        CHECK_OBJ_NOTNULL(r2->rxbuf, H2_RXBUF_MAGIC);
        assert(r2->rxbuf->tail <= r2->rxbuf->head);
        l = r2->rxbuf->head - r2->rxbuf->tail;
        assert(l <= r2->rxbuf->size);
        l = r2->rxbuf->size - l;
        assert(len <= l); /* Stream window handling ensures this */

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

        l = len;
        head = r2->rxbuf->head;
        do {
                l2 = l;
                if ((head % r2->rxbuf->size) + l2 > r2->rxbuf->size)
                        l2 = r2->rxbuf->size - (head % r2->rxbuf->size);
                assert(l2 > 0);
                memcpy(&r2->rxbuf->data[head % r2->rxbuf->size], src, l2);
                src += l2;
                head += l2;
                l -= l2;
        } while (l > 0);

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

        /* Charge stream window. The entire frame including padding
         * (h2->rxf_len) counts towards the window. The used padding
         * bytes will be included in the next connection window update
         * sent when the buffer bytes are consumed because that is
         * calculated against the available buffer space. */
        r2->r_window -= h2->rxf_len;
        r2->rxbuf->head += len;
        assert(r2->rxbuf->tail <= r2->rxbuf->head);
        if (h2->rxf_flags & H2FF_DATA_END_STREAM)
                r2->state = H2_S_CLOS_REM;
        if (r2->cond)
                PTOK(pthread_cond_signal(r2->cond));
        Lck_Unlock(&h2->sess->mtx);

        return (0);
}

static enum vfp_status v_matchproto_(vfp_pull_f)
h2_vfp_body(struct vfp_ctx *vc, struct vfp_entry *vfe, void *ptr, ssize_t *lp)
{
        struct h2_req *r2;
        struct h2_sess *h2;
        enum vfp_status retval;
        ssize_t l, l2;
        uint64_t tail;
        uint8_t *dst;
        char buf[4];
        int i;

        CHECK_OBJ_NOTNULL(vc, VFP_CTX_MAGIC);
        CHECK_OBJ_NOTNULL(vfe, VFP_ENTRY_MAGIC);
        CAST_OBJ_NOTNULL(r2, vfe->priv1, H2_REQ_MAGIC);
        h2 = r2->h2sess;

        AN(ptr);
        AN(lp);
        assert(*lp >= 0);

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

        r2->cond = &vc->wrk->cond;
        while (1) {
                CHECK_OBJ_ORNULL(r2->rxbuf, H2_RXBUF_MAGIC);
                if (r2->rxbuf) {
                        assert(r2->rxbuf->tail <= r2->rxbuf->head);
                        l = r2->rxbuf->head - r2->rxbuf->tail;
                } else
                        l = 0;

                if (h2->error != NULL || r2->error != NULL)
                        retval = VFP_ERROR;
                else if (r2->state >= H2_S_CLOS_REM && l <= *lp)
                        retval = VFP_END;
                else {
                        if (l > *lp)
                                l = *lp;
                        retval = VFP_OK;
                }

                if (retval != VFP_OK || l > 0)
                        break;

                i = Lck_CondWaitTimeout(r2->cond, &h2->sess->mtx,
                    SESS_TMO(h2->sess, timeout_idle));
                if (i == ETIMEDOUT) {
                        retval = VFP_ERROR;
                        break;
                }
        }
        r2->cond = NULL;

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

        if (l == 0 || retval == VFP_ERROR) {
                *lp = 0;
                return (retval);
        }

        *lp = l;
        dst = ptr;
        tail = r2->rxbuf->tail;
        do {
                l2 = l;
                if ((tail % r2->rxbuf->size) + l2 > r2->rxbuf->size)
                        l2 = r2->rxbuf->size - (tail % r2->rxbuf->size);
                assert(l2 > 0);
                memcpy(dst, &r2->rxbuf->data[tail % r2->rxbuf->size], l2);
                dst += l2;
                tail += l2;
                l -= l2;
        } while (l > 0);

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

        CHECK_OBJ_NOTNULL(r2->rxbuf, H2_RXBUF_MAGIC);
        r2->rxbuf->tail = tail;
        assert(r2->rxbuf->tail <= r2->rxbuf->head);

        if (r2->r_window < cache_param->h2_rx_window_low_water &&
            r2->state < H2_S_CLOS_REM) {
                /* l is free buffer space */
                /* l2 is calculated window increment */
                l = r2->rxbuf->size - (r2->rxbuf->head - r2->rxbuf->tail);
                assert(r2->r_window <= l);
                l2 = cache_param->h2_rx_window_increment;
                if (r2->r_window + l2 > l)
                        l2 = l - r2->r_window;
                r2->r_window += l2;
        } else
                l2 = 0;

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

        if (l2 > 0) {
                vbe32enc(buf, l2);
                H2_Send_Get(vc->wrk, h2, r2);
                H2_Send_Frame(vc->wrk, h2, H2_F_WINDOW_UPDATE, 0, 4,
                    r2->stream, buf);
                H2_Send_Rel(h2, r2);
        }

        return (retval);
}

static void
h2_vfp_body_fini(struct vfp_ctx *vc, struct vfp_entry *vfe)
{
        struct h2_req *r2;
        struct h2_sess *h2;
        struct stv_buffer *stvbuf = NULL;

        CHECK_OBJ_NOTNULL(vc, VFP_CTX_MAGIC);
        CHECK_OBJ_NOTNULL(vfe, VFP_ENTRY_MAGIC);
        CAST_OBJ_NOTNULL(r2, vfe->priv1, H2_REQ_MAGIC);
        CHECK_OBJ_NOTNULL(r2->req, REQ_MAGIC);
        h2 = r2->h2sess;

        if (vc->failed) {
                CHECK_OBJ_NOTNULL(r2->req->wrk, WORKER_MAGIC);
                H2_Send_Get(r2->req->wrk, h2, r2);
                H2_Send_RST(r2->req->wrk, h2, r2, r2->stream,
                    H2SE_REFUSED_STREAM);
                H2_Send_Rel(h2, r2);
                Lck_Lock(&h2->sess->mtx);
                r2->error = H2SE_REFUSED_STREAM;
                Lck_Unlock(&h2->sess->mtx);
        }

        if (r2->state >= H2_S_CLOS_REM && r2->rxbuf != NULL) {
                Lck_Lock(&h2->sess->mtx);
                CHECK_OBJ_ORNULL(r2->rxbuf, H2_RXBUF_MAGIC);
                if (r2->rxbuf != NULL) {
                        stvbuf = r2->rxbuf->stvbuf;
                        r2->rxbuf = NULL;
                }
                Lck_Unlock(&h2->sess->mtx);
                if (stvbuf != NULL) {
                        STV_FreeBuf(vc->wrk, &stvbuf);
                        AZ(stvbuf);
                }
        }
}

static const struct vfp h2_body = {
        .name = "H2_BODY",
        .pull = h2_vfp_body,
        .fini = h2_vfp_body_fini
};

void v_matchproto_(vtr_req_body_t)
h2_req_body(struct req *req)
{
        struct h2_req *r2;
        struct vfp_entry *vfe;

        CHECK_OBJ(req, REQ_MAGIC);
        CAST_OBJ_NOTNULL(r2, req->transport_priv, H2_REQ_MAGIC);
        vfe = VFP_Push(req->vfc, &h2_body);
        AN(vfe);
        vfe->priv1 = r2;
}

/**********************************************************************/

void v_matchproto_(vtr_req_fail_f)
h2_req_fail(struct req *req, stream_close_t reason)
{
        assert(reason != SC_NULL);
        assert(req->sp->fd != 0);
        VSLb(req->vsl, SLT_Debug, "H2FAILREQ");
}

/**********************************************************************/

static enum htc_status_e v_matchproto_(htc_complete_f)
h2_frame_complete(struct http_conn *htc)
{
        struct h2_sess *h2;

        CHECK_OBJ_NOTNULL(htc, HTTP_CONN_MAGIC);
        CAST_OBJ_NOTNULL(h2, htc->priv, H2_SESS_MAGIC);
        if (htc->rxbuf_b + 9 > htc->rxbuf_e ||
            htc->rxbuf_b + 9 + (vbe32dec(htc->rxbuf_b) >> 8) > htc->rxbuf_e)
                return (HTC_S_MORE);
        return (HTC_S_COMPLETE);
}

/**********************************************************************/

static h2_error
h2_procframe(struct worker *wrk, struct h2_sess *h2, h2_frame h2f)
{
        struct h2_req *r2;
        h2_error h2e;

        ASSERT_RXTHR(h2);
        if (h2->rxf_stream == 0 && h2f->act_szero != 0) {
                H2S_Lock_VSLb(h2, SLT_SessError, "H2: unexpected %s frame on stream 0",
                    h2f->name);
                return (h2f->act_szero);
        }

        if (h2->rxf_stream != 0 && h2f->act_snonzero != 0) {
                H2S_Lock_VSLb(h2, SLT_SessError, "H2: unexpected %s frame on stream %d",
                    h2f->name, h2->rxf_stream);
                return (h2f->act_snonzero);
        }

        if (h2->rxf_stream > h2->highest_stream && h2f->act_sidle != 0) {
                H2S_Lock_VSLb(h2, SLT_SessError, "H2: unexpected %s frame on idle stream "
                    "%d", h2f->name, h2->rxf_stream);
                return (h2f->act_sidle);
        }

        if (h2->rxf_stream != 0 && !(h2->rxf_stream & 1)) {
                // rfc7540,l,1140,1145
                // rfc7540,l,1153,1158
                /* No even streams, we don't do PUSH_PROMISE */
                H2S_Lock_VSLb(h2, SLT_SessError, "H2: illegal stream (=%u)",
                    h2->rxf_stream);
                return (H2CE_PROTOCOL_ERROR);
        }

        VTAILQ_FOREACH(r2, &h2->streams, list)
                if (r2->stream == h2->rxf_stream)
                        break;

        if (h2->new_req != NULL && h2f != H2_F_CONTINUATION) {
                H2S_Lock_VSLb(h2, SLT_SessError, "H2: expected continuation but "
                    " received %s on stream %d", h2f->name, h2->rxf_stream);
                return (H2CE_PROTOCOL_ERROR);   // rfc7540,l,1859,1863
        }

        h2e = h2f->rxfunc(wrk, h2, r2);
        if (h2e == NULL)
                return (NULL);
        if (h2->rxf_stream == 0 || h2e->connection)
                return (h2e);   // Connection errors one level up

        H2_Send_Get(wrk, h2, h2->req0);
        H2_Send_RST(wrk, h2, h2->req0, h2->rxf_stream, h2e);
        H2_Send_Rel(h2, h2->req0);
        return (NULL);
}

h2_error
h2_stream_tmo(struct h2_sess *h2, const struct h2_req *r2, vtim_real now)
{
        h2_error h2e = NULL;

        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
        Lck_AssertHeld(&h2->sess->mtx);

        /* NB: when now is NAN, it means that h2_window_timeout was hit
         * on a lock condwait operation.
         */
        if (isnan(now))
                AN(r2->t_winupd);

        if (h2->error != NULL && h2->error->connection &&
            !h2->error->send_goaway)
                return (h2->error);

        if (r2->t_winupd == 0 && r2->t_send == 0)
                return (NULL);

        if (isnan(now) || (r2->t_winupd != 0 &&
            now - r2->t_winupd > cache_param->h2_window_timeout)) {
                VSLb(h2->vsl, SLT_Debug,
                     "H2: stream %u: Hit h2_window_timeout", r2->stream);
                h2e = H2SE_BROKE_WINDOW;
        }

        if (h2e == NULL && r2->t_send != 0 &&
            now - r2->t_send > SESS_TMO(h2->sess, send_timeout)) {
                VSLb(h2->vsl, SLT_Debug,
                     "H2: stream %u: Hit send_timeout", r2->stream);
                h2e = H2SE_CANCEL;
        }

        return (h2e);
}

static h2_error
h2_stream_tmo_unlocked(struct h2_sess *h2, const struct h2_req *r2)
{
        h2_error h2e;

        Lck_Lock(&h2->sess->mtx);
        h2e = h2_stream_tmo(h2, r2, h2->sess->t_idle);
        Lck_Unlock(&h2->sess->mtx);

        return (h2e);
}

/*
 * This is the janitorial task of cleaning up any closed & refused
 * streams, and checking if the session is timed out.
 */
static h2_error
h2_sweep(struct worker *wrk, struct h2_sess *h2)
{
        struct h2_req *r2, *r22;
        h2_error h2e, tmo;
        vtim_real now;

        ASSERT_RXTHR(h2);

        h2e = h2->error;
        now = VTIM_real();
        if (h2e == NULL && h2->open_streams == 0 &&
            h2->sess->t_idle + cache_param->timeout_idle < now)
                h2e = H2CE_NO_ERROR;

        h2->do_sweep = 0;
        VTAILQ_FOREACH_SAFE(r2, &h2->streams, list, r22) {
                if (r2 == h2->req0) {
                        assert (r2->state == H2_S_IDLE);
                        continue;
                }
                switch (r2->state) {
                case H2_S_CLOSED:
                        if (!r2->scheduled)
                                h2_del_req(wrk, r2);
                        break;
                case H2_S_CLOS_REM:
                        if (!r2->scheduled) {
                                H2_Send_Get(wrk, h2, h2->req0);
                                H2_Send_RST(wrk, h2, h2->req0, r2->stream,
                                    H2SE_REFUSED_STREAM);
                                H2_Send_Rel(h2, h2->req0);
                                h2_del_req(wrk, r2);
                                continue;
                        }
                        /* FALLTHROUGH */
                case H2_S_CLOS_LOC:
                case H2_S_OPEN:
                        tmo = h2_stream_tmo_unlocked(h2, r2);
                        if (h2e == NULL)
                                h2e = tmo;
                        break;
                case H2_S_IDLE:
                        /* Current code make this unreachable: h2_new_req is
                         * only called inside h2_rx_headers, which immediately
                         * sets the new stream state to H2_S_OPEN */
                        /* FALLTHROUGH */
                default:
                        WRONG("Wrong h2 stream state");
                        break;
                }
        }
        return (h2e);
}


/***********************************************************************
 * Called in loop from h2_new_session()
 */

#define H2_FRAME(l,U,...) const struct h2_frame_s H2_F_##U[1] = \
    {{ #U, h2_rx_##l, __VA_ARGS__ }};
#include "tbl/h2_frames.h"

static const h2_frame h2flist[] = {
#define H2_FRAME(l,U,t,...) [t] = H2_F_##U,
#include "tbl/h2_frames.h"
};

#define H2FMAX (sizeof(h2flist) / sizeof(h2flist[0]))

int
h2_rxframe(struct worker *wrk, struct h2_sess *h2)
{
        enum htc_status_e hs;
        h2_frame h2f;
        h2_error h2e;
        const char *s, *r;

        ASSERT_RXTHR(h2);

        if (h2->goaway && h2->open_streams == 0)
                return (0);

        VTCP_blocking(*h2->htc->rfd);
        hs = HTC_RxStuff(h2->htc, h2_frame_complete, NULL, NULL, NAN,
            VTIM_real() + 0.5, NAN, h2->local_settings.max_frame_size + 9);

        h2e = NULL;
        switch (hs) {
        case HTC_S_COMPLETE:
                h2->sess->t_idle = VTIM_real();
                if (h2->do_sweep)
                        h2e = h2_sweep(wrk, h2);
                break;
        case HTC_S_TIMEOUT:
                h2e = h2_sweep(wrk, h2);
                break;
        default:
                h2e = H2CE_ENHANCE_YOUR_CALM;
        }

        if (h2e != NULL && h2e->connection) {
                HTC_Status(hs, &s, &r);
                H2S_Lock_VSLb(h2, SLT_SessError, "H2: HTC %s (%s)", s, r);
                h2->error = h2e;
                h2_tx_goaway(wrk, h2, h2e);
                return (0);
        }

        if (hs != HTC_S_COMPLETE)
                return (1);

        h2->rxf_len = vbe32dec(h2->htc->rxbuf_b) >> 8;
        h2->rxf_type = h2->htc->rxbuf_b[3];
        h2->rxf_flags = h2->htc->rxbuf_b[4];
        h2->rxf_stream = vbe32dec(h2->htc->rxbuf_b + 5);
        h2->rxf_stream &= ~(1LU<<31);                   // rfc7540,l,690,692
        h2->rxf_data = (void*)(h2->htc->rxbuf_b + 9);
        /* XXX: later full DATA will not be rx'ed yet. */
        HTC_RxPipeline(h2->htc, h2->htc->rxbuf_b + h2->rxf_len + 9);

        h2_vsl_frame(h2, h2->htc->rxbuf_b, 9L + h2->rxf_len);
        h2->srq->acct.req_hdrbytes += 9;

        if (h2->rxf_type >= H2FMAX) {
                // rfc7540,l,679,681
                // XXX: later, drain rest of frame
                h2->bogosity++;
                H2S_Lock_VSLb(h2, SLT_Debug,
                    "H2: Unknown frame type 0x%02x (ignored)",
                    (uint8_t)h2->rxf_type);
                h2->srq->acct.req_bodybytes += h2->rxf_len;
                return (1);
        }
        h2f = h2flist[h2->rxf_type];

        AN(h2f->name);
        AN(h2f->rxfunc);
        if (h2f->overhead)
                h2->srq->acct.req_bodybytes += h2->rxf_len;

        if (h2->rxf_flags & ~h2f->flags) {
                // rfc7540,l,687,688
                h2->bogosity++;
                H2S_Lock_VSLb(h2, SLT_Debug,
                    "H2: Unknown flags 0x%02x on %s (ignored)",
                    (uint8_t)h2->rxf_flags & ~h2f->flags, h2f->name);
                h2->rxf_flags &= h2f->flags;
        }

        h2e = h2_procframe(wrk, h2, h2f);
        if (h2->error == NULL && h2e != NULL) {
                h2->error = h2e;
                h2_tx_goaway(wrk, h2, h2e);
        }

        return (h2->error != NULL ? 0 : 1);
}

		varnish-cache/bin/varnishd/http2/cache_http2_proto.c
0		/*-
1		* Copyright (c) 2016-2019 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 "cache/cache_varnishd.h"
34
35		#include <stdio.h>
36		#include <stdlib.h>
37
38		#include "cache/cache_transport.h"
39		#include "cache/cache_filter.h"
40		#include "http2/cache_http2.h"
41		#include "cache/cache_objhead.h"
42		#include "storage/storage.h"
43
44		#include "vend.h"
45		#include "vtcp.h"
46		#include "vtim.h"
47
48		#define H2_CUSTOM_ERRORS
49		#define H2EC1(U,v,g,r,d) \
50		const struct h2_error_s H2CE_##U[1] = {{#U,d,v,0,1,g,r}};
51		#define H2EC2(U,v,g,r,d) \
52		const struct h2_error_s H2SE_##U[1] = {{#U,d,v,1,0,g,r}};
53		#define H2EC3(U,v,g,r,d) H2EC1(U,v,g,r,d) H2EC2(U,v,g,r,d)
54		#define H2_ERROR(NAME, val, sc, goaway, reason, desc) \
55		H2EC##sc(NAME, val, goaway, reason, desc)
56		#include "tbl/h2_error.h"
57		#undef H2EC1
58		#undef H2EC2
59		#undef H2EC3
60
61		static const struct h2_error_s H2NN_ERROR[1] = {{
62		"UNKNOWN_ERROR",
63		"Unknown error number",
64		0xffffffff,
65		1,
66		1,
67		0,
68		SC_RX_JUNK
69		}};
70
71		enum h2frame {
72		#define H2_FRAME(l,u,t,f,...) H2F_##u = t,
73		#include "tbl/h2_frames.h"
74		};
75
76		static const char *
77	32840	h2_framename(enum h2frame h2f)
78		{
79
80	32840	switch (h2f) {
81		#define H2_FRAME(l,u,t,f,...) case H2F_##u: return (#u);
82		#include "tbl/h2_frames.h"
83		default:
84		return (NULL);
85		}
86	32840	}
87
88		#define H2_FRAME_FLAGS(l,u,v) const uint8_t H2FF_##u = v;
89		#include "tbl/h2_frames.h"
90
91		/**********************************************************************
92		*/
93
94		static const h2_error stream_errors[] = {
95		#define H2EC1(U,v,g,r,d)
96		#define H2EC2(U,v,g,r,d) [v] = H2SE_##U,
97		#define H2EC3(U,v,g,r,d) H2EC1(U,v,g,r,d) H2EC2(U,v,g,r,d)
98		#define H2_ERROR(NAME, val, sc, goaway, reason, desc) \
99		H2EC##sc(NAME, val, goaway, reason, desc)
100		#include "tbl/h2_error.h"
101		#undef H2EC1
102		#undef H2EC2
103		#undef H2EC3
104		};
105
106		#define NSTREAMERRORS (sizeof(stream_errors)/sizeof(stream_errors[0]))
107
108		static h2_error
109	600	h2_streamerror(uint32_t u)
110		{
111	600	if (u < NSTREAMERRORS && stream_errors[u] != NULL)
112	520	return (stream_errors[u]);
113		else
114	80	return (H2NN_ERROR);
115	600	}
116
117		/**********************************************************************
118		*/
119
120		static const h2_error conn_errors[] = {
121		#define H2EC1(U,v,g,r,d) [v] = H2CE_##U,
122		#define H2EC2(U,v,g,r,d)
123		#define H2EC3(U,v,g,r,d) H2EC1(U,v,g,r,d) H2EC2(U,v,g,r,d)
124		#define H2_ERROR(NAME, val, sc, goaway, reason, desc) \
125		H2EC##sc(NAME, val, goaway, reason, desc)
126		#include "tbl/h2_error.h"
127		#undef H2EC1
128		#undef H2EC2
129		#undef H2EC3
130		};
131
132		#define NCONNERRORS (sizeof(conn_errors)/sizeof(conn_errors[0]))
133
134		static h2_error
135	120	h2_connectionerror(uint32_t u)
136		{
137	120	if (u < NCONNERRORS && conn_errors[u] != NULL)
138	80	return (conn_errors[u]);
139		else
140	40	return (H2NN_ERROR);
141	120	}
142
143		/**********************************************************************/
144
145		struct h2_req *
146	12280	h2_new_req(struct h2_sess h2, unsigned stream, struct req req)
147		{
148		struct h2_req *r2;
149
150	12280	ASSERT_RXTHR(h2);
151	12280	if (req == NULL)
152	12080	req = Req_New(h2->sess);
153	12280	CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
154
155	12280	r2 = WS_Alloc(req->ws, sizeof *r2);
156	12280	AN(r2);
157	12280	INIT_OBJ(r2, H2_REQ_MAGIC);
158	12280	r2->state = H2_S_IDLE;
159	12280	r2->h2sess = h2;
160	12280	r2->stream = stream;
161	12280	r2->req = req;
162	12280	if (stream)
163	6600	r2->counted = 1;
164	12280	r2->r_window = h2->local_settings.initial_window_size;
165	12280	r2->t_window = h2->remote_settings.initial_window_size;
166	12280	req->transport_priv = r2;
167	12280	Lck_Lock(&h2->sess->mtx);
168	12280	if (stream)
169	6600	h2->open_streams++;
170	12280	VTAILQ_INSERT_TAIL(&h2->streams, r2, list);
171	12280	Lck_Unlock(&h2->sess->mtx);
172	12280	h2->refcnt++;
173	12280	return (r2);
174		}
175
176		void
177	11956	h2_del_req(struct worker wrk, struct h2_req r2)
178		{
179		struct h2_sess *h2;
180		struct sess *sp;
181		struct stv_buffer *stvbuf;
182
183	11956	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
184	11956	AZ(r2->scheduled);
185	11956	h2 = r2->h2sess;
186	11956	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
187	11956	ASSERT_RXTHR(h2);
188	11956	sp = h2->sess;
189	11956	Lck_Lock(&sp->mtx);
190	11956	assert(h2->refcnt > 0);
191	11956	--h2->refcnt;
192		/* XXX: PRIORITY reshuffle */
193	11956	VTAILQ_REMOVE(&h2->streams, r2, list);
194	11956	Lck_Unlock(&sp->mtx);
195
196	11956	assert(!WS_IsReserved(r2->req->ws));
197	11956	AZ(r2->req->ws->r);
198
199	11956	CHECK_OBJ_ORNULL(r2->rxbuf, H2_RXBUF_MAGIC);
200	11956	if (r2->rxbuf) {
201	160	stvbuf = r2->rxbuf->stvbuf;
202	160	r2->rxbuf = NULL;
203	160	STV_FreeBuf(wrk, &stvbuf);
204	160	AZ(stvbuf);
205	160	}
206
207	11956	Req_Cleanup(sp, wrk, r2->req);
208	11956	if (FEATURE(FEATURE_BUSY_STATS_RATE))
209	0	WRK_AddStat(wrk);
210	11956	Req_Release(r2->req);
211	11956	}
212
213		void
214	5795	h2_kill_req(struct worker wrk, struct h2_sess h2,
215		struct h2_req *r2, h2_error h2e)
216		{
217
218	5795	ASSERT_RXTHR(h2);
219	5795	AN(h2e);
220	5795	Lck_Lock(&h2->sess->mtx);
221	11590	VSLb(h2->vsl, SLT_Debug, "KILL st=%u state=%d sched=%d",
222	5795	r2->stream, r2->state, r2->scheduled);
223	5795	if (r2->counted) {
224	1785	assert(h2->open_streams > 0);
225	1785	h2->open_streams--;
226	1785	r2->counted = 0;
227	1785	}
228	5795	if (r2->error == NULL)
229	600	r2->error = h2e;
230	5795	if (r2->scheduled) {
231	2295	if (r2->cond != NULL)
232	241	PTOK(pthread_cond_signal(r2->cond));
233	2295	r2 = NULL;
234	2295	Lck_Unlock(&h2->sess->mtx);
235	2295	} else {
236	3500	Lck_Unlock(&h2->sess->mtx);
237	3500	if (r2->state == H2_S_OPEN && h2->new_req == r2->req)
238	160	(void)h2h_decode_hdr_fini(h2);
239		}
240	5795	if (r2 != NULL)
241	3500	h2_del_req(wrk, r2);
242	5795	}
243
244		/**********************************************************************/
245
246		static void
247	33440	h2_vsl_frame(const struct h2_sess h2, const void ptr, size_t len)
248		{
249		const uint8_t *b;
250		struct vsb *vsb;
251		const char *p;
252		unsigned u;
253
254	33440	if (VSL_tag_is_masked(SLT_H2RxHdr) &&
255	600	VSL_tag_is_masked(SLT_H2RxBody))
256	600	return;
257
258	32840	AN(ptr);
259	32840	assert(len >= 9);
260	32840	b = ptr;
261
262	32840	vsb = VSB_new_auto();
263	32840	AN(vsb);
264	32840	p = h2_framename((enum h2frame)b[3]);
265	32840	if (p != NULL)
266	32800	VSB_cat(vsb, p);
267		else
268	40	VSB_quote(vsb, b + 3, 1, VSB_QUOTE_HEX);
269
270	32840	u = vbe32dec(b) >> 8;
271	32840	VSB_printf(vsb, "[%u] ", u);
272	32840	VSB_quote(vsb, b + 4, 1, VSB_QUOTE_HEX);
273	32840	VSB_putc(vsb, ' ');
274	32840	VSB_quote(vsb, b + 5, 4, VSB_QUOTE_HEX);
275	32840	if (u > 0) {
276	22200	VSB_putc(vsb, ' ');
277	22200	VSB_quote(vsb, b + 9, len - 9, VSB_QUOTE_HEX);
278	22200	}
279	32840	AZ(VSB_finish(vsb));
280	32840	Lck_Lock(&h2->sess->mtx);
281	32840	VSLb_bin(h2->vsl, SLT_H2RxHdr, 9, b);
282	32840	if (len > 9)
283	22200	VSLb_bin(h2->vsl, SLT_H2RxBody, len - 9, b + 9);
284
285	32840	VSLb(h2->vsl, SLT_Debug, "H2RXF %s", VSB_data(vsb));
286	32840	Lck_Unlock(&h2->sess->mtx);
287	32840	VSB_destroy(&vsb);
288	33440	}
289
290
291		/**********************************************************************
292		*/
293
294		static h2_error v_matchproto_(h2_rxframe_f)
295	240	h2_rx_ping(struct worker wrk, struct h2_sess h2, struct h2_req *r2)
296		{
297
298	240	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
299	240	ASSERT_RXTHR(h2);
300	240	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
301	240	assert(r2 == h2->req0);
302
303	240	if (h2->rxf_len != 8) { // rfc7540,l,2364,2366
304	40	H2S_Lock_VSLb(h2, SLT_SessError, "H2: rx ping with (len != 8)");
305	40	return (H2CE_FRAME_SIZE_ERROR);
306		}
307	200	AZ(h2->rxf_stream); // rfc7540,l,2359,2362
308	200	if (h2->rxf_flags != 0) { // We never send pings
309	40	H2S_Lock_VSLb(h2, SLT_SessError, "H2: rx ping ack");
310	40	return (H2SE_PROTOCOL_ERROR);
311		}
312	160	H2_Send_Get(wrk, h2, r2);
313	320	H2_Send_Frame(wrk, h2,
314	160	H2_F_PING, H2FF_PING_ACK, 8, 0, h2->rxf_data);
315	160	H2_Send_Rel(h2, r2);
316	160	return (0);
317	240	}
318
319		/**********************************************************************
320		*/
321
322		static h2_error v_matchproto_(h2_rxframe_f)
323	80	h2_rx_push_promise(struct worker wrk, struct h2_sess h2, struct h2_req *r2)
324		{
325
326	80	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
327	80	ASSERT_RXTHR(h2);
328	80	CHECK_OBJ_ORNULL(r2, H2_REQ_MAGIC);
329		// rfc7540,l,2262,2267
330	80	H2S_Lock_VSLb(h2, SLT_SessError, "H2: rx push promise");
331	80	return (H2CE_PROTOCOL_ERROR);
332		}
333
334		/**********************************************************************
335		*/
336
337		static h2_error
338	600	h2_rapid_reset(struct worker wrk, struct h2_sess h2, struct h2_req *r2)
339		{
340		vtim_real now;
341		vtim_dur d;
342
343	600	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
344	600	ASSERT_RXTHR(h2);
345	600	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
346
347	600	if (h2->rapid_reset_limit == 0)
348	0	return (0);
349
350	600	now = VTIM_real();
351	600	CHECK_OBJ_NOTNULL(r2->req, REQ_MAGIC);
352	600	AN(r2->req->t_first);
353	600	if (now - r2->req->t_first > h2->rapid_reset)
354	0	return (0);
355
356	600	d = now - h2->last_rst;
357	1200	h2->rst_budget += h2->rapid_reset_limit * d /
358	600	h2->rapid_reset_period;
359	600	h2->rst_budget = vmin_t(double, h2->rst_budget,
360		h2->rapid_reset_limit);
361	600	h2->last_rst = now;
362
363	600	if (h2->rst_budget < 1.0) {
364	80	H2S_Lock_VSLb(h2, SLT_SessError, "H2: Hit RST limit. Closing session.");
365	80	return (H2CE_RAPID_RESET);
366		}
367	520	h2->rst_budget -= 1.0;
368	520	return (0);
369	600	}
370
371		static h2_error v_matchproto_(h2_rxframe_f)
372	760	h2_rx_rst_stream(struct worker wrk, struct h2_sess h2, struct h2_req *r2)
373		{
374		h2_error h2e;
375
376	760	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
377	760	ASSERT_RXTHR(h2);
378	760	CHECK_OBJ_ORNULL(r2, H2_REQ_MAGIC);
379
380	760	if (h2->rxf_len != 4) { // rfc7540,l,2003,2004
381	40	H2S_Lock_VSLb(h2, SLT_SessError, "H2: rx rst with (len != 4)");
382	40	return (H2CE_FRAME_SIZE_ERROR);
383		}
384	720	if (r2 == NULL)
385	120	return (0);
386	600	h2e = h2_rapid_reset(wrk, h2, r2);
387	600	h2_kill_req(wrk, h2, r2, h2_streamerror(vbe32dec(h2->rxf_data)));
388	600	return (h2e);
389	760	}
390
391		/**********************************************************************
392		*/
393
394		static h2_error v_matchproto_(h2_rxframe_f)
395	120	h2_rx_goaway(struct worker wrk, struct h2_sess h2, struct h2_req *r2)
396		{
397
398	120	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
399	120	ASSERT_RXTHR(h2);
400	120	CHECK_OBJ_NOTNULL(r2, H2_REQ_MAGIC);
401	120	assert(r2 == h2->req0);
402
403	120	h2->goaway = 1;
404	120	h2->goaway_last_stream = vbe32dec(h2->rxf_data);
405	120	h2->error = h2_connectionerror(vbe32dec(h2->rxf_data + 4));
406	120	H2S_Lock_VSLb(h2, SLT_Debug, "GOAWAY %s", h2->error->name);
407	120	return (h2->error);
408		}
409
410		static void
411	5360	h2_tx_goaway(struct worker wrk, struct h2_sess h2, h2_error h2e)
412		{
413		char b[8];
414
415	5360	ASSERT_RXTHR(h2);
416	5360	AN(h2e);
417
418	5360	if (h2->goaway \|\| !h2e->send_goaway)
419	0	return;
420
421	5360	h2->goaway = 1;
422	5360	vbe32enc(b, h2->highest_stream);
423	5360	vbe32enc(b + 4, h2e->val);
424	5360	H2_Send_Get(wrk, h2, h2->req0);
425	5360	H2_Send_Frame(wrk, h2, H2_F_GOAWAY, 0, 8, 0, b);
426	5360	H2_Send_Rel(h2, h2->req0);
427	5360	}
428
429		/**********************************************************************
430		*/
431
432		static h2_error v_matchproto_(h2_rxframe_f)
433	880	h2_rx_window_update(struct worker wrk, struct h2_sess h2, struct h2_req *r2)
434		{
435		uint32_t wu;
436
437	880	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
438	880	ASSERT_RXTHR(h2);
439	880	CHECK_OBJ_ORNULL(r2, H2_REQ_MAGIC);
440
441	880	if (h2->rxf_len != 4) {
442	40	H2S_Lock_VSLb(h2, SLT_SessError, "H2: rx winup with (len != 4)");
443	40	return (H2CE_FRAME_SIZE_ERROR);
444		}
445	840	wu = vbe32dec(h2->rxf_data) & ~(1LU<<31);
446	840	if (wu == 0)
447	40	return (H2SE_PROTOCOL_ERROR);
448	800	if (r2 == NULL)
449	40	return (0);
450	760	Lck_Lock(&h2->sess->mtx);
451	760	r2->t_window += wu;
452	760	if (r2 == h2->req0)
453	320	PTOK(pthread_cond_broadcast(h2->winupd_cond));
454	440	else if (r2->cond != NULL)
455	320	PTOK(pthread_cond_signal(r2->cond));
456	760	Lck_Unlock(&h2->sess->mtx);
457	760	if (r2->t_window >= (1LL << 31))
458	80	return (H2SE_FLOW_CONTROL_ERROR);
459	680	return (0);
460	880	}
461
462		/**********************************************************************
463		* Incoming PRIORITY, possibly an ACK of one we sent.
464		*/
465
466		static h2_error v_matchproto_(h2_rxframe_f)
467	360	h2_rx_priority(struct worker wrk, struct h2_sess h2, struct h2_req *r2)
468		{
469
470	360	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
471	360	ASSERT_RXTHR(h2);
472	360	CHECK_OBJ_ORNULL(r2, H2_REQ_MAGIC);
473	360	return (0);
474		}
475
476		/**********************************************************************
477		* Incoming SETTINGS, possibly an ACK of one we sent.
478		*/
479
480		#define H2_SETTING(U,l, ...) \
481		static void v_matchproto_(h2_setsetting_f) \
482		h2_setting_##l(struct h2_settings* s, uint32_t v) \
483		{ \
484		s -> l = v; \
485		}
486		#include <tbl/h2_settings.h>
487
488		#define H2_SETTING(U, l, ...) \
489		const struct h2_setting_s H2_SET_##U[1] = {{ \
490		#l, \
491		h2_setting_##l, \
492		__VA_ARGS__ \
493		}};
494		#include <tbl/h2_settings.h>
495
496		static const struct h2_setting_s * const h2_setting_tbl[] = {
497		#define H2_SETTING(U,l,v, ...) [v] = H2_SET_##U,
498		#include <tbl/h2_settings.h>
499		};