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 "cache/cache_varnishd.h"

#include <stdio.h>

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

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

static const char h2_resp_101[] =
        "HTTP/1.1 101 Switching Protocols\r\n"
        "Connection: Upgrade\r\n"
        "Upgrade: h2c\r\n"
        "\r\n";

static const char H2_prism[24] = {
        0x50, 0x52, 0x49, 0x20, 0x2a, 0x20, 0x48, 0x54,
        0x54, 0x50, 0x2f, 0x32, 0x2e, 0x30, 0x0d, 0x0a,
        0x0d, 0x0a, 0x53, 0x4d, 0x0d, 0x0a, 0x0d, 0x0a
};

static size_t
h2_enc_settings(const struct h2_settings *h2s, uint8_t *buf, ssize_t n)
{
        uint8_t *p = buf;

#define H2_SETTING(U,l,v,d,...)                         \
        if (h2s->l != d) {                              \
                n -= 6;                                 \
                assert(n >= 0);                         \
                vbe16enc(p, v);                         \
                p += 2;                                 \
                vbe32enc(p, h2s->l);                    \
                p += 4;                                 \
        }
#include "tbl/h2_settings.h"
        return (p - buf);
}

static const struct h2_settings H2_proto_settings = {
#define H2_SETTING(U,l,v,d,...) . l = d,
#include "tbl/h2_settings.h"
};

static void
h2_local_settings(struct h2_settings *h2s)
{
        *h2s = H2_proto_settings;
#define H2_SETTINGS_PARAM_ONLY
#define H2_SETTING(U, l, ...)                   \
        h2s->l = cache_param->h2_##l;
#include "tbl/h2_settings.h"
#undef H2_SETTINGS_PARAM_ONLY
        h2s->max_header_list_size = cache_param->http_req_size;
}

void
H2S_Lock_VSLb(const struct h2_sess *h2, enum VSL_tag_e tag, const char *fmt, ...)
{
        va_list ap;
        int held = 0;

        AN(h2);

        if (VSL_tag_is_masked(tag))
                return;

        if (h2->highest_stream > 0) {
                held = 1;
                Lck_Lock(&h2->sess->mtx);
        }

        va_start(ap, fmt);
        VSLbv(h2->vsl, tag, fmt, ap);
        va_end(ap);

        if (held)
                Lck_Unlock(&h2->sess->mtx);
}

/**********************************************************************
 * The h2_sess struct needs many of the same things as a request,
 * WS, VSL, HTC &c,  but rather than implement all that stuff over, we
 * grab an actual struct req, and mirror the relevant fields into
 * struct h2_sess.
 */

static struct h2_sess *
h2_init_sess(struct sess *sp,
    struct h2_sess *h2s, struct req *srq, struct h2h_decode *decode)
{
        uintptr_t *up;
        struct h2_sess *h2;

        /* proto_priv session attribute will always have been set up by H1
         * before reaching here. */
        AZ(SES_Get_proto_priv(sp, &up));
        assert(*up == 0);

        if (srq == NULL)
                srq = Req_New(sp, NULL);
        AN(srq);
        h2 = h2s;
        AN(h2);
        INIT_OBJ(h2, H2_SESS_MAGIC);
        h2->srq = srq;
        h2->htc = srq->htc;
        h2->ws = srq->ws;
        h2->vsl = srq->vsl;
        VSL_Flush(h2->vsl, 0);
        h2->vsl->wid = sp->vxid;
        h2->htc->rfd = &sp->fd;
        h2->sess = sp;
        h2->rxthr = pthread_self();
        PTOK(pthread_cond_init(h2->winupd_cond, NULL));
        VTAILQ_INIT(&h2->streams);
        VTAILQ_INIT(&h2->txqueue);
        h2_local_settings(&h2->local_settings);
        h2->remote_settings = H2_proto_settings;
        h2->decode = decode;

        h2->rapid_reset = cache_param->h2_rapid_reset;
        h2->rapid_reset_limit = cache_param->h2_rapid_reset_limit;
        h2->rapid_reset_period = cache_param->h2_rapid_reset_period;

        h2->rst_budget = h2->rapid_reset_limit;
        h2->last_rst = sp->t_open;
        AZ(isnan(h2->last_rst));

        AZ(VHT_Init(h2->dectbl, h2->local_settings.header_table_size));

        *up = (uintptr_t)h2;

        return (h2);
}

static void
h2_del_sess(struct worker *wrk, struct h2_sess *h2, stream_close_t reason)
{
        struct sess *sp;
        struct req *req;

        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        AZ(h2->refcnt);
        assert(VTAILQ_EMPTY(&h2->streams));
        AN(reason);

        VHT_Fini(h2->dectbl);
        PTOK(pthread_cond_destroy(h2->winupd_cond));
        TAKE_OBJ_NOTNULL(req, &h2->srq, REQ_MAGIC);
        assert(!WS_IsReserved(req->ws));
        sp = h2->sess;
        Req_Cleanup(sp, wrk, req);
        Req_Release(req);
        SES_Delete(sp, reason, NAN);
}

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

enum htc_status_e v_matchproto_(htc_complete_f)
H2_prism_complete(struct http_conn *htc)
{
        size_t sz;

        CHECK_OBJ_NOTNULL(htc, HTTP_CONN_MAGIC);
        sz = sizeof(H2_prism);
        if (htc->rxbuf_b + sz > htc->rxbuf_e)
                sz = htc->rxbuf_e - htc->rxbuf_b;
        if (memcmp(htc->rxbuf_b, H2_prism, sz))
                return (HTC_S_JUNK);
        return (sz == sizeof(H2_prism) ? HTC_S_COMPLETE : HTC_S_MORE);
}


/**********************************************************************
 * Deal with the base64url (NB: ...url!) encoded SETTINGS in the H1 req
 * of a H2C upgrade.
 */

static int
h2_b64url_settings(struct h2_sess *h2, struct req *req)
{
        const char *p, *q;
        uint8_t u[6], *up;
        unsigned x;
        int i, n;
        static const char s[] =
            "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
            "abcdefghijklmnopqrstuvwxyz"
            "0123456789"
            "-_=";

        /*
         * If there is trouble with this, we could reject the upgrade
         * but putting this on the H1 side is just plain wrong...
         */
        if (!http_GetHdr(req->http, H_HTTP2_Settings, &p))
                return (-1);
        AN(p);
        VSLb(req->vsl, SLT_Debug, "H2CS %s", p);

        n = 0;
        x = 0;
        up = u;
        for (;*p; p++) {
                q = strchr(s, *p);
                if (q == NULL)
                        return (-1);
                i = q - s;
                assert(i >= 0 && i <= 64);
                x <<= 6;
                x |= i;
                n += 6;
                if (n < 8)
                        continue;
                *up++ = (uint8_t)(x >> (n - 8));
                n -= 8;
                if (up == u + sizeof u) {
                        AZ(n);
                        if (h2_set_setting(h2, (void*)u))
                                return (-1);
                        up = u;
                }
        }
        if (up != u)
                return (-1);
        return (0);
}


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

static int
h2_ou_rel(struct worker *wrk, struct req *req)
{
        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
        AZ(req->vcl);
        Req_AcctLogCharge(wrk->stats, req);
        Req_Release(req);
        return (0);
}

static int
h2_ou_session(struct worker *wrk, struct h2_sess *h2,
    struct req *req)
{
        ssize_t sz;
        enum htc_status_e hs;
        struct h2_req *r2;

        if (h2_b64url_settings(h2, req)) {
                VSLb(h2->vsl, SLT_Debug, "H2: Bad HTTP-Settings");
                return (h2_ou_rel(wrk, req));
        }

        sz = write(h2->sess->fd, h2_resp_101, strlen(h2_resp_101));
        VTCP_Assert(sz);
        if (sz != strlen(h2_resp_101)) {
                VSLb(h2->vsl, SLT_Debug, "H2: Upgrade: Error writing 101"
                    " response: %s\n", VAS_errtxt(errno));
                return (h2_ou_rel(wrk, req));
        }

        http_Unset(req->http, H_Upgrade);
        http_Unset(req->http, H_HTTP2_Settings);

        /* Steal pipelined read-ahead, if any */
        h2->htc->pipeline_b = req->htc->pipeline_b;
        h2->htc->pipeline_e = req->htc->pipeline_e;
        req->htc->pipeline_b = NULL;
        req->htc->pipeline_e = NULL;
        /* XXX: This call may assert on buffer overflow if the pipelined
           data exceeds the available space in the ws workspace. What to
           do about the overflowing data is an open issue. */
        HTC_RxInit(h2->htc, h2->ws);

        /* Start req thread */
        r2 = h2_new_req(h2, 1, req);
        AZ(h2->highest_stream);
        h2->highest_stream = r2->stream;
        req->transport = &HTTP2_transport;
        assert(req->req_step == R_STP_TRANSPORT);
        req->task->func = h2_do_req;
        req->task->priv = req;
        r2->scheduled = 1;
        r2->state = H2_S_CLOS_REM; // rfc7540,l,489,491
        req->err_code = 0;
        http_SetH(req->http, HTTP_HDR_PROTO, "HTTP/2.0");

        /* Wait for PRISM response */
        hs = HTC_RxStuff(h2->htc, H2_prism_complete,
            NULL, NULL, NAN, h2->sess->t_idle + cache_param->timeout_idle, NAN,
            sizeof H2_prism);
        if (hs != HTC_S_COMPLETE) {
                VSLb(h2->vsl, SLT_Debug, "H2: No/Bad OU PRISM (hs=%d)", hs);
                r2->scheduled = 0;
                h2_del_req(wrk, r2);
                return (0);
        }
        if (Pool_Task(wrk->pool, req->task, TASK_QUEUE_REQ)) {
                r2->scheduled = 0;
                h2_del_req(wrk, r2);
                VSLb(h2->vsl, SLT_Debug, "H2: No Worker-threads");
                return (0);
        }
        return (1);
}

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

#define H2_PU_MARKER    1
#define H2_OU_MARKER    2

void
H2_PU_Sess(struct worker *wrk, struct sess *sp, struct req *req)
{
        VSL(SLT_Debug, sp->vxid, "H2 Prior Knowledge Upgrade");
        req->err_code = H2_PU_MARKER;
        SES_SetTransport(wrk, sp, req, &HTTP2_transport);
}

void
H2_OU_Sess(struct worker *wrk, struct sess *sp, struct req *req)
{
        VSL(SLT_Debug, sp->vxid, "H2 Optimistic Upgrade");
        req->err_code = H2_OU_MARKER;
        SES_SetTransport(wrk, sp, req, &HTTP2_transport);
}

static void v_matchproto_(task_func_t)
h2_new_session(struct worker *wrk, void *arg)
{
        struct req *req;
        struct sess *sp;
        struct h2_sess h2s;
        struct h2_sess *h2;
        struct h2_req *r2, *r22;
        int again;
        uint8_t settings[48];
        struct h2h_decode decode;
        size_t l;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        CAST_OBJ_NOTNULL(req, arg, REQ_MAGIC);
        sp = req->sp;
        CHECK_OBJ_NOTNULL(sp, SESS_MAGIC);

        if (wrk->wpriv->vcl)
                VCL_Rel(&wrk->wpriv->vcl);

        assert(req->transport == &HTTP2_transport);

        assert (req->err_code == H2_PU_MARKER || req->err_code == H2_OU_MARKER);

        h2 = h2_init_sess(sp, &h2s,
            req->err_code == H2_PU_MARKER ? req : NULL, &decode);
        h2->req0 = h2_new_req(h2, 0, NULL);
        AZ(h2->htc->priv);
        h2->htc->priv = h2;

        AZ(wrk->vsl);
        wrk->vsl = h2->vsl;

        if (req->err_code == H2_OU_MARKER && !h2_ou_session(wrk, h2, req)) {
                assert(h2->refcnt == 1);
                h2_del_req(wrk, h2->req0);
                h2_del_sess(wrk, h2, SC_RX_JUNK);
                wrk->vsl = NULL;
                return;
        }
        assert(HTC_S_COMPLETE == H2_prism_complete(h2->htc));
        HTC_RxPipeline(h2->htc, h2->htc->rxbuf_b + sizeof(H2_prism));
        HTC_RxInit(h2->htc, h2->ws);
        AN(WS_Reservation(h2->ws));
        VSLb(h2->vsl, SLT_Debug, "H2: Got pu PRISM");

        THR_SetRequest(h2->srq);
        AN(WS_Reservation(h2->ws));

        l = h2_enc_settings(&h2->local_settings, settings, sizeof (settings));
        AN(WS_Reservation(h2->ws));
        H2_Send_Get(wrk, h2, h2->req0);
        AN(WS_Reservation(h2->ws));
        H2_Send_Frame(wrk, h2,
            H2_F_SETTINGS, H2FF_NONE, l, 0, settings);
        AN(WS_Reservation(h2->ws));
        H2_Send_Rel(h2, h2->req0);
        AN(WS_Reservation(h2->ws));

        /* and off we go... */
        h2->cond = &wrk->cond;

        while (h2_rxframe(wrk, h2)) {
                HTC_RxInit(h2->htc, h2->ws);
                if (WS_Overflowed(h2->ws)) {
                        H2S_Lock_VSLb(h2, SLT_SessError, "H2: Empty Rx Workspace");
                        h2->error = H2CE_INTERNAL_ERROR;
                        break;
                }
                AN(WS_Reservation(h2->ws));
        }

        AN(h2->error);

        /* Delete all idle streams */
        Lck_Lock(&h2->sess->mtx);
        VSLb(h2->vsl, SLT_Debug, "H2 CLEANUP %s", h2->error->name);
        VTAILQ_FOREACH(r2, &h2->streams, list) {
                if (r2->error == 0)
                        r2->error = h2->error;
                if (r2->cond != NULL)
                        PTOK(pthread_cond_signal(r2->cond));
        }
        PTOK(pthread_cond_broadcast(h2->winupd_cond));
        Lck_Unlock(&h2->sess->mtx);
        while (1) {
                again = 0;
                VTAILQ_FOREACH_SAFE(r2, &h2->streams, list, r22) {
                        if (r2 != h2->req0) {
                                h2_kill_req(wrk, h2, r2, h2->error);
                                again++;
                        }
                }
                if (!again)
                        break;
                Lck_Lock(&h2->sess->mtx);
                VTAILQ_FOREACH(r2, &h2->streams, list)
                        VSLb(h2->vsl, SLT_Debug, "ST %u %d",
                            r2->stream, r2->state);
                (void)Lck_CondWaitTimeout(h2->cond, &h2->sess->mtx, .1);
                Lck_Unlock(&h2->sess->mtx);
        }
        h2->cond = NULL;
        assert(h2->refcnt == 1);
        h2_del_req(wrk, h2->req0);
        h2_del_sess(wrk, h2, h2->error->reason);
        wrk->vsl = NULL;
}

static int v_matchproto_(vtr_poll_f)
h2_poll(struct req *req)
{
        struct h2_req *r2;

        CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
        CAST_OBJ_NOTNULL(r2, req->transport_priv, H2_REQ_MAGIC);
        return (r2->error ? -1 : 1);
}

struct transport HTTP2_transport = {
        .name =                 "HTTP/2",
        .magic =                TRANSPORT_MAGIC,
        .deliver =              h2_deliver,
        .minimal_response =     h2_minimal_response,
        .new_session =          h2_new_session,
        .req_body =             h2_req_body,
        .req_fail =             h2_req_fail,
        .sess_panic =           h2_sess_panic,
        .poll =                 h2_poll,
};

		varnish-cache/bin/varnishd/http2/cache_http2_session.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 "cache/cache_varnishd.h"
34
35		#include <stdio.h>
36
37		#include "cache/cache_transport.h"
38		#include "http2/cache_http2.h"
39
40		#include "vend.h"
41		#include "vtcp.h"
42	300
43		static const char h2_resp_101[] =
44		"HTTP/1.1 101 Switching Protocols\r\n"
45		"Connection: Upgrade\r\n"
46		"Upgrade: h2c\r\n"
47		"\r\n";
48
49		static const char H2_prism[24] = {
50		0x50, 0x52, 0x49, 0x20, 0x2a, 0x20, 0x48, 0x54,
51		0x54, 0x50, 0x2f, 0x32, 0x2e, 0x30, 0x0d, 0x0a,
52		0x0d, 0x0a, 0x53, 0x4d, 0x0d, 0x0a, 0x0d, 0x0a
53	300	};
54
55		static size_t
56	300	h2_enc_settings(const struct h2_settings h2s, uint8_t buf, ssize_t n)
57		{
58	300	uint8_t *p = buf;
59
60		#define H2_SETTING(U,l,v,d,...) \
61		if (h2s->l != d) { \
62		n -= 6; \
63		assert(n >= 0); \
64	300	vbe16enc(p, v); \
65		p += 2; \
66		vbe32enc(p, h2s->l); \
67		p += 4; \
68		}
69		#include "tbl/h2_settings.h"
70		return (p - buf);
71		}
72
73		static const struct h2_settings H2_proto_settings = {
74	300	#define H2_SETTING(U,l,v,d,...) . l = d,
75		#include "tbl/h2_settings.h"
76		};
77
78		static void
79	308	h2_local_settings(struct h2_settings *h2s)
80		{
81	308	*h2s = H2_proto_settings;
82		#define H2_SETTINGS_PARAM_ONLY
83		#define H2_SETTING(U, l, ...) \
84	300	h2s->l = cache_param->h2_##l;
85		#include "tbl/h2_settings.h"
86		#undef H2_SETTINGS_PARAM_ONLY
87		h2s->max_header_list_size = cache_param->http_req_size;
88		}
89
90		void
91	521	H2S_Lock_VSLb(const struct h2_sess h2, enum VSL_tag_e tag, const char fmt, ...)
92		{
93		va_list ap;
94	521	int held = 0;
95	300
96	521	AN(h2);
97
98	521	if (VSL_tag_is_masked(tag))
99	0	return;
100
101	521	if (h2->highest_stream > 0) {
102	471	held = 1;
103	471	Lck_Lock(&h2->sess->mtx);
104	471	}
105	300
106	521	va_start(ap, fmt);
107	521	VSLbv(h2->vsl, tag, fmt, ap);
108	521	va_end(ap);
109
110	521	if (held)
111	471	Lck_Unlock(&h2->sess->mtx);
112	521	}
113
114		/**********************************************************************
115	300	* The h2_sess struct needs many of the same things as a request,
116		* WS, VSL, HTC &c, but rather than implement all that stuff over, we
117		* grab an actual struct req, and mirror the relevant fields into
118		* struct h2_sess.
119		*/
120
121		static struct h2_sess *
122	308	h2_init_sess(struct sess *sp,
123		struct h2_sess h2s, struct req srq, struct h2h_decode *decode)
124		{
125	300	uintptr_t *up;
126		struct h2_sess *h2;
127
128		/* proto_priv session attribute will always have been set up by H1
129		* before reaching here. */
130	308	AZ(SES_Get_proto_priv(sp, &up));
131	308	assert(*up == 0);
132
133	308	if (srq == NULL)
134	14	srq = Req_New(sp, NULL);
135	308	AN(srq);
136	308	h2 = h2s;
137	308	AN(h2);
138	308	INIT_OBJ(h2, H2_SESS_MAGIC);
139	308	h2->srq = srq;
140	308	h2->htc = srq->htc;
141	308	h2->ws = srq->ws;
142	308	h2->vsl = srq->vsl;
143	308	VSL_Flush(h2->vsl, 0);
144	308	h2->vsl->wid = sp->vxid;
145	308	h2->htc->rfd = &sp->fd;
146	308	h2->sess = sp;
147	308	h2->rxthr = pthread_self();
148	308	PTOK(pthread_cond_init(h2->winupd_cond, NULL));
149	308	VTAILQ_INIT(&h2->streams);
150	308	VTAILQ_INIT(&h2->txqueue);
151	308	h2_local_settings(&h2->local_settings);
152	308	h2->remote_settings = H2_proto_settings;
153	308	h2->decode = decode;
154
155	308	h2->rapid_reset = cache_param->h2_rapid_reset;
156	308	h2->rapid_reset_limit = cache_param->h2_rapid_reset_limit;
157	308	h2->rapid_reset_period = cache_param->h2_rapid_reset_period;
158
159	308	h2->rst_budget = h2->rapid_reset_limit;
160	308	h2->last_rst = sp->t_open;
161	308	AZ(isnan(h2->last_rst));
162
163	308	AZ(VHT_Init(h2->dectbl, h2->local_settings.header_table_size));
164
165	308	*up = (uintptr_t)h2;
166
167	308	return (h2);
168		}
169
170		static void
171	306	h2_del_sess(struct worker wrk, struct h2_sess h2, stream_close_t reason)
172		{
173		struct sess *sp;
174		struct req *req;
175
176	306	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
177	306	AZ(h2->refcnt);
178	306	assert(VTAILQ_EMPTY(&h2->streams));
179	306	AN(reason);
180
181	306	VHT_Fini(h2->dectbl);
182	306	PTOK(pthread_cond_destroy(h2->winupd_cond));
183	306	TAKE_OBJ_NOTNULL(req, &h2->srq, REQ_MAGIC);
184	306	assert(!WS_IsReserved(req->ws));
185	306	sp = h2->sess;
186	306	Req_Cleanup(sp, wrk, req);
187	306	Req_Release(req);
188	306	SES_Delete(sp, reason, NAN);
189	306	}
190
191		/**********************************************************************/
192
193		enum htc_status_e v_matchproto_(htc_complete_f)
194	18925	H2_prism_complete(struct http_conn *htc)
195		{
196		size_t sz;
197
198	18925	CHECK_OBJ_NOTNULL(htc, HTTP_CONN_MAGIC);
199	18925	sz = sizeof(H2_prism);
200	18925	if (htc->rxbuf_b + sz > htc->rxbuf_e)
201	411	sz = htc->rxbuf_e - htc->rxbuf_b;
202	18925	if (memcmp(htc->rxbuf_b, H2_prism, sz))
203	17705	return (HTC_S_JUNK);
204	1220	return (sz == sizeof(H2_prism) ? HTC_S_COMPLETE : HTC_S_MORE);
205	18925	}
206
207
208		/**********************************************************************
209		* Deal with the base64url (NB: ...url!) encoded SETTINGS in the H1 req
210		* of a H2C upgrade.
211		*/
212
213		static int
214	14	h2_b64url_settings(struct h2_sess h2, struct req req)
215		{
216		const char p, q;
217		uint8_t u[6], *up;
218		unsigned x;
219		int i, n;
220		static const char s[] =
221		"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
222		"abcdefghijklmnopqrstuvwxyz"
223		"0123456789"
224		"-_=";
225
226		/*
227		* If there is trouble with this, we could reject the upgrade
228		* but putting this on the H1 side is just plain wrong...
229		*/
230	14	if (!http_GetHdr(req->http, H_HTTP2_Settings, &p))
231	2	return (-1);
232	12	AN(p);
233	12	VSLb(req->vsl, SLT_Debug, "H2CS %s", p);
234
235	12	n = 0;
236	12	x = 0;
237	12	up = u;
238	172	for (;*p; p++) {
239	162	q = strchr(s, *p);
240	162	if (q == NULL)
241	2	return (-1);
242	160	i = q - s;
243	160	assert(i >= 0 && i <= 64);
244	160	x <<= 6;
245	160	x \|= i;
246	160	n += 6;
247	160	if (n < 8)
248	40	continue;
249	120	*up++ = (uint8_t)(x >> (n - 8));
250	120	n -= 8;
251	120	if (up == u + sizeof u) {
252	20	AZ(n);
253	20	if (h2_set_setting(h2, (void*)u))
254	0	return (-1);
255	20	up = u;
256	20	}
257	120	}
258	10	if (up != u)
259	0	return (-1);
260	10	return (0);
261	14	}
262
263
264		/**********************************************************************/
265
266		static int
267	4	h2_ou_rel(struct worker wrk, struct req req)
268		{
269	4	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
270	4	CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
271	4	AZ(req->vcl);
272	4	Req_AcctLogCharge(wrk->stats, req);
273	4	Req_Release(req);
274	4	return (0);
275		}
276
277		static int
278	14	h2_ou_session(struct worker wrk, struct h2_sess h2,
279		struct req *req)
280		{
281		ssize_t sz;
282		enum htc_status_e hs;
283		struct h2_req *r2;
284
285	14	if (h2_b64url_settings(h2, req)) {
286	4	VSLb(h2->vsl, SLT_Debug, "H2: Bad HTTP-Settings");
287	4	return (h2_ou_rel(wrk, req));
288		}
289
290	10	sz = write(h2->sess->fd, h2_resp_101, strlen(h2_resp_101));
291	10	VTCP_Assert(sz);
292	10	if (sz != strlen(h2_resp_101)) {
293	0	VSLb(h2->vsl, SLT_Debug, "H2: Upgrade: Error writing 101"
294	0	" response: %s\n", VAS_errtxt(errno));
295	0	return (h2_ou_rel(wrk, req));
296		}
297
298	10	http_Unset(req->http, H_Upgrade);
299	10	http_Unset(req->http, H_HTTP2_Settings);
300
301		/* Steal pipelined read-ahead, if any */
302	10	h2->htc->pipeline_b = req->htc->pipeline_b;
303	10	h2->htc->pipeline_e = req->htc->pipeline_e;
304	10	req->htc->pipeline_b = NULL;
305	10	req->htc->pipeline_e = NULL;
306		/* XXX: This call may assert on buffer overflow if the pipelined
307		data exceeds the available space in the ws workspace. What to
308		do about the overflowing data is an open issue. */
309	10	HTC_RxInit(h2->htc, h2->ws);
310
311		/* Start req thread */
312	10	r2 = h2_new_req(h2, 1, req);
313	10	AZ(h2->highest_stream);
314	10	h2->highest_stream = r2->stream;
315	10	req->transport = &HTTP2_transport;
316	10	assert(req->req_step == R_STP_TRANSPORT);
317	10	req->task->func = h2_do_req;
318	10	req->task->priv = req;
319	10	r2->scheduled = 1;
320	10	r2->state = H2_S_CLOS_REM; // rfc7540,l,489,491
321	10	req->err_code = 0;
322	10	http_SetH(req->http, HTTP_HDR_PROTO, "HTTP/2.0");
323
324		/* Wait for PRISM response */
325	20	hs = HTC_RxStuff(h2->htc, H2_prism_complete,
326	10	NULL, NULL, NAN, h2->sess->t_idle + cache_param->timeout_idle, NAN,
327		sizeof H2_prism);
328	10	if (hs != HTC_S_COMPLETE) {
329	2	VSLb(h2->vsl, SLT_Debug, "H2: No/Bad OU PRISM (hs=%d)", hs);
330	2	r2->scheduled = 0;
331	2	h2_del_req(wrk, r2);
332	2	return (0);
333		}
334	8	if (Pool_Task(wrk->pool, req->task, TASK_QUEUE_REQ)) {
335	2	r2->scheduled = 0;
336	2	h2_del_req(wrk, r2);
337	2	VSLb(h2->vsl, SLT_Debug, "H2: No Worker-threads");
338	2	return (0);
339		}
340	6	return (1);
341	14	}
342
343		/**********************************************************************
344		*/
345
346		#define H2_PU_MARKER 1
347		#define H2_OU_MARKER 2
348
349		void
350	294	H2_PU_Sess(struct worker wrk, struct sess sp, struct req *req)
351		{
352	294	VSL(SLT_Debug, sp->vxid, "H2 Prior Knowledge Upgrade");
353	294	req->err_code = H2_PU_MARKER;
354	294	SES_SetTransport(wrk, sp, req, &HTTP2_transport);
355	294	}
356
357		void
358	14	H2_OU_Sess(struct worker wrk, struct sess sp, struct req *req)
359		{
360	14	VSL(SLT_Debug, sp->vxid, "H2 Optimistic Upgrade");
361	14	req->err_code = H2_OU_MARKER;
362	14	SES_SetTransport(wrk, sp, req, &HTTP2_transport);
363	14	}
364
365		static void v_matchproto_(task_func_t)
366	308	h2_new_session(struct worker wrk, void arg)
367		{
368		struct req *req;
369		struct sess *sp;
370		struct h2_sess h2s;
371		struct h2_sess *h2;
372		struct h2_req r2, r22;
373		int again;
374		uint8_t settings[48];
375		struct h2h_decode decode;
376		size_t l;
377
378	308	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
379	308	CAST_OBJ_NOTNULL(req, arg, REQ_MAGIC);
380	308	sp = req->sp;
381	308	CHECK_OBJ_NOTNULL(sp, SESS_MAGIC);
382
383	308	if (wrk->wpriv->vcl)
384	48	VCL_Rel(&wrk->wpriv->vcl);
385
386	308	assert(req->transport == &HTTP2_transport);
387
388	308	assert (req->err_code == H2_PU_MARKER \|\| req->err_code == H2_OU_MARKER);
389
390	616	h2 = h2_init_sess(sp, &h2s,
391	308	req->err_code == H2_PU_MARKER ? req : NULL, &decode);
392	308	h2->req0 = h2_new_req(h2, 0, NULL);
393	308	AZ(h2->htc->priv);
394	308	h2->htc->priv = h2;
395
396	308	AZ(wrk->vsl);
397	308	wrk->vsl = h2->vsl;
398
399	308	if (req->err_code == H2_OU_MARKER && !h2_ou_session(wrk, h2, req)) {
400	8	assert(h2->refcnt == 1);
401	8	h2_del_req(wrk, h2->req0);
402	8	h2_del_sess(wrk, h2, SC_RX_JUNK);
403	8	wrk->vsl = NULL;
404	8	return;
405		}
406	300	assert(HTC_S_COMPLETE == H2_prism_complete(h2->htc));
407	300	HTC_RxPipeline(h2->htc, h2->htc->rxbuf_b + sizeof(H2_prism));
408	300	HTC_RxInit(h2->htc, h2->ws);
409	300	AN(WS_Reservation(h2->ws));
410	300	VSLb(h2->vsl, SLT_Debug, "H2: Got pu PRISM");
411
412	300	THR_SetRequest(h2->srq);
413	300	AN(WS_Reservation(h2->ws));
414
415	300	l = h2_enc_settings(&h2->local_settings, settings, sizeof (settings));
416	300	AN(WS_Reservation(h2->ws));
417	300	H2_Send_Get(wrk, h2, h2->req0);
418	300	AN(WS_Reservation(h2->ws));
419	600	H2_Send_Frame(wrk, h2,
420	300	H2_F_SETTINGS, H2FF_NONE, l, 0, settings);
421	300	AN(WS_Reservation(h2->ws));
422	300	H2_Send_Rel(h2, h2->req0);
423	300	AN(WS_Reservation(h2->ws));
424
425		/* and off we go... */
426	300	h2->cond = &wrk->cond;
427
428	2177	while (h2_rxframe(wrk, h2)) {
429	1877	HTC_RxInit(h2->htc, h2->ws);
430	1877	if (WS_Overflowed(h2->ws)) {
431	0	H2S_Lock_VSLb(h2, SLT_SessError, "H2: Empty Rx Workspace");
432	0	h2->error = H2CE_INTERNAL_ERROR;
433	0	break;
434		}
435	1877	AN(WS_Reservation(h2->ws));
436		}
437
438	300	AN(h2->error);
439
440		/* Delete all idle streams */
441	300	Lck_Lock(&h2->sess->mtx);
442	300	VSLb(h2->vsl, SLT_Debug, "H2 CLEANUP %s", h2->error->name);
443	823	VTAILQ_FOREACH(r2, &h2->streams, list) {
444	523	if (r2->error == 0)
445	494	r2->error = h2->error;
446	523	if (r2->cond != NULL)
447	8	PTOK(pthread_cond_signal(r2->cond));
448	523	}
449	300	PTOK(pthread_cond_broadcast(h2->winupd_cond));
450	300	Lck_Unlock(&h2->sess->mtx);
451	532	while (1) {
452	532	again = 0;
453	1382	VTAILQ_FOREACH_SAFE(r2, &h2->streams, list, r22) {
454	850	if (r2 != h2->req0) {
455	320	h2_kill_req(wrk, h2, r2, h2->error);
456	320	again++;
457	320	}
458	850	}
459	532	if (!again)
460	300	break;
461	232	Lck_Lock(&h2->sess->mtx);
462	559	VTAILQ_FOREACH(r2, &h2->streams, list)
463	654	VSLb(h2->vsl, SLT_Debug, "ST %u %d",
464	327	r2->stream, r2->state);
465	232	(void)Lck_CondWaitTimeout(h2->cond, &h2->sess->mtx, .1);
466	232	Lck_Unlock(&h2->sess->mtx);
467		}
468	300	h2->cond = NULL;
469	300	assert(h2->refcnt == 1);
470	300	h2_del_req(wrk, h2->req0);
471	300	h2_del_sess(wrk, h2, h2->error->reason);
472	300	wrk->vsl = NULL;
473	308	}
474
475		static int v_matchproto_(vtr_poll_f)
476	937	h2_poll(struct req *req)
477		{
478		struct h2_req *r2;
479
480	937	CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
481	937	CAST_OBJ_NOTNULL(r2, req->transport_priv, H2_REQ_MAGIC);
482	937	return (r2->error ? -1 : 1);
483		}
484
485		struct transport HTTP2_transport = {
486		.name = "HTTP/2",
487		.magic = TRANSPORT_MAGIC,
488		.deliver = h2_deliver,
489		.minimal_response = h2_minimal_response,
490		.new_session = h2_new_session,
491		.req_body = h2_req_body,
492		.req_fail = h2_req_fail,
493		.sess_panic = h2_sess_panic,
494		.poll = h2_poll,
495		};