/* * include/common/h2.h * This file contains types and macros used for the HTTP/2 protocol * * Copyright (C) 2000-2017 Willy Tarreau - w@1wt.eu * Copyright (C) 2017 HAProxy Technologies * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ #ifndef _COMMON_H2_H #define _COMMON_H2_H #include #include #include #include /* indexes of most important pseudo headers can be simplified to an almost * linear array by dividing the index by 2 for all values from 1 to 9, and * caping to 4 for values up to 14 ; thus it fits in a single 24-bit array * shifted by 3 times the index value/2, or a 32-bit array shifted by 4x. * Don't change these values, they are assumed by hpack_idx_to_phdr(). There * is an entry for the Host header field which is not a pseudo-header but * needs to be tracked as we should only use :authority if it's absent. */ enum { H2_PHDR_IDX_NONE = 0, H2_PHDR_IDX_AUTH = 1, /* :authority = 1 */ H2_PHDR_IDX_METH = 2, /* :method = 2..3 */ H2_PHDR_IDX_PATH = 3, /* :path = 4..5 */ H2_PHDR_IDX_SCHM = 4, /* :scheme = 6..7 */ H2_PHDR_IDX_STAT = 5, /* :status = 8..14 */ H2_PHDR_IDX_HOST = 6, /* Host, never returned, just a place-holder */ H2_PHDR_NUM_ENTRIES /* must be last */ }; /* bit fields indicating the pseudo-headers found. It also covers the HOST * header field as well as any non-pseudo-header field (NONE). */ enum { H2_PHDR_FND_NONE = 1 << H2_PHDR_IDX_NONE, /* found a regular header */ H2_PHDR_FND_AUTH = 1 << H2_PHDR_IDX_AUTH, H2_PHDR_FND_METH = 1 << H2_PHDR_IDX_METH, H2_PHDR_FND_PATH = 1 << H2_PHDR_IDX_PATH, H2_PHDR_FND_SCHM = 1 << H2_PHDR_IDX_SCHM, H2_PHDR_FND_STAT = 1 << H2_PHDR_IDX_STAT, H2_PHDR_FND_HOST = 1 << H2_PHDR_IDX_HOST, }; /* frame types, from the standard */ enum h2_ft { H2_FT_DATA = 0x00, // RFC7540 #6.1 H2_FT_HEADERS = 0x01, // RFC7540 #6.2 H2_FT_PRIORITY = 0x02, // RFC7540 #6.3 H2_FT_RST_STREAM = 0x03, // RFC7540 #6.4 H2_FT_SETTINGS = 0x04, // RFC7540 #6.5 H2_FT_PUSH_PROMISE = 0x05, // RFC7540 #6.6 H2_FT_PING = 0x06, // RFC7540 #6.7 H2_FT_GOAWAY = 0x07, // RFC7540 #6.8 H2_FT_WINDOW_UPDATE = 0x08, // RFC7540 #6.9 H2_FT_CONTINUATION = 0x09, // RFC7540 #6.10 H2_FT_ENTRIES /* must be last */ } __attribute__((packed)); /* frame types, turned to bits or bit fields */ enum { /* one bit per frame type */ H2_FT_DATA_BIT = 1U << H2_FT_DATA, H2_FT_HEADERS_BIT = 1U << H2_FT_HEADERS, H2_FT_PRIORITY_BIT = 1U << H2_FT_PRIORITY, H2_FT_RST_STREAM_BIT = 1U << H2_FT_RST_STREAM, H2_FT_SETTINGS_BIT = 1U << H2_FT_SETTINGS, H2_FT_PUSH_PROMISE_BIT = 1U << H2_FT_PUSH_PROMISE, H2_FT_PING_BIT = 1U << H2_FT_PING, H2_FT_GOAWAY_BIT = 1U << H2_FT_GOAWAY, H2_FT_WINDOW_UPDATE_BIT = 1U << H2_FT_WINDOW_UPDATE, H2_FT_CONTINUATION_BIT = 1U << H2_FT_CONTINUATION, /* padded frames */ H2_FT_PADDED_MASK = H2_FT_DATA_BIT | H2_FT_HEADERS_BIT | H2_FT_PUSH_PROMISE_BIT, /* flow controlled frames */ H2_FT_FC_MASK = H2_FT_DATA_BIT, /* header frames */ H2_FT_HDR_MASK = H2_FT_HEADERS_BIT | H2_FT_PUSH_PROMISE_BIT | H2_FT_CONTINUATION_BIT, /* frames allowed to arrive late on a stream */ H2_FT_LATE_MASK = H2_FT_WINDOW_UPDATE_BIT | H2_FT_RST_STREAM_BIT | H2_FT_PRIORITY_BIT, }; /* flags defined for each frame type */ // RFC7540 #6.1 #define H2_F_DATA_END_STREAM 0x01 #define H2_F_DATA_PADDED 0x08 // RFC7540 #6.2 #define H2_F_HEADERS_END_STREAM 0x01 #define H2_F_HEADERS_END_HEADERS 0x04 #define H2_F_HEADERS_PADDED 0x08 #define H2_F_HEADERS_PRIORITY 0x20 // RFC7540 #6.3 : PRIORITY defines no flags // RFC7540 #6.4 : RST_STREAM defines no flags // RFC7540 #6.5 #define H2_F_SETTINGS_ACK 0x01 // RFC7540 #6.6 #define H2_F_PUSH_PROMISE_END_HEADERS 0x04 #define H2_F_PUSH_PROMISE_PADDED 0x08 // RFC7540 #6.7 #define H2_F_PING_ACK 0x01 // RFC7540 #6.8 : GOAWAY defines no flags // RFC7540 #6.9 : WINDOW_UPDATE defines no flags // PADDED is the exact same among DATA, HEADERS and PUSH_PROMISE (8) #define H2_F_PADDED 0x08 /* HTTP/2 error codes - RFC7540 #7 */ enum h2_err { H2_ERR_NO_ERROR = 0x0, H2_ERR_PROTOCOL_ERROR = 0x1, H2_ERR_INTERNAL_ERROR = 0x2, H2_ERR_FLOW_CONTROL_ERROR = 0x3, H2_ERR_SETTINGS_TIMEOUT = 0x4, H2_ERR_STREAM_CLOSED = 0x5, H2_ERR_FRAME_SIZE_ERROR = 0x6, H2_ERR_REFUSED_STREAM = 0x7, H2_ERR_CANCEL = 0x8, H2_ERR_COMPRESSION_ERROR = 0x9, H2_ERR_CONNECT_ERROR = 0xa, H2_ERR_ENHANCE_YOUR_CALM = 0xb, H2_ERR_INADEQUATE_SECURITY = 0xc, H2_ERR_HTTP_1_1_REQUIRED = 0xd, } __attribute__((packed)); // RFC7540 #11.3 : Settings Registry #define H2_SETTINGS_HEADER_TABLE_SIZE 0x0001 #define H2_SETTINGS_ENABLE_PUSH 0x0002 #define H2_SETTINGS_MAX_CONCURRENT_STREAMS 0x0003 #define H2_SETTINGS_INITIAL_WINDOW_SIZE 0x0004 #define H2_SETTINGS_MAX_FRAME_SIZE 0x0005 #define H2_SETTINGS_MAX_HEADER_LIST_SIZE 0x0006 /* some protocol constants */ // PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n #define H2_CONN_PREFACE \ "\x50\x52\x49\x20\x2a\x20\x48\x54" \ "\x54\x50\x2f\x32\x2e\x30\x0d\x0a" \ "\x0d\x0a\x53\x4d\x0d\x0a\x0d\x0a" /* some flags related to protocol parsing */ #define H2_MSGF_BODY 0x0001 // a body is present #define H2_MSGF_BODY_CL 0x0002 // content-length is present #define H2_MSGF_BODY_TUNNEL 0x0004 // a tunnel is in use (CONNECT) #define H2_MSGF_RSP_1XX 0x0010 // a 1xx ( != 101) HEADERS frame was received #define H2_MAX_STREAM_ID ((1U << 31) - 1) #define H2_MAX_FRAME_LEN ((1U << 24) - 1) #define H2_DIR_REQ 1 #define H2_DIR_RES 2 #define H2_DIR_BOTH 3 /* constraints imposed by the protocol on each frame type, in terms of stream * ID values, frame sizes, and direction so that most connection-level checks * can be centralized regardless of the frame's acceptance. */ struct h2_frame_definition { int32_t dir; /* 0=none, 1=request, 2=response, 3=both */ int32_t min_id; /* minimum allowed stream ID */ int32_t max_id; /* maximum allowed stream ID */ int32_t min_len; /* minimum frame length */ int32_t max_len; /* maximum frame length */ }; extern struct h2_frame_definition h2_frame_definition[H2_FT_ENTRIES]; /* various protocol processing functions */ int h2_make_h1_request(struct http_hdr *list, char *out, int osize, unsigned int *msgf, unsigned long long *body_len); int h2_make_h1_trailers(struct http_hdr *list, char *out, int osize); int h2_parse_cont_len_header(unsigned int *msgf, struct ist *value, unsigned long long *body_len); int h2_make_htx_request(struct http_hdr *list, struct htx *htx, unsigned int *msgf, unsigned long long *body_len); int h2_make_htx_response(struct http_hdr *list, struct htx *htx, unsigned int *msgf, unsigned long long *body_len); int h2_make_htx_trailers(struct http_hdr *list, struct htx *htx); /* * Some helpful debugging functions. */ /* returns a bit corresponding to the frame type */ static inline unsigned int h2_ft_bit(enum h2_ft ft) { return 1U << ft; } /* returns the frame type as a string */ static inline const char *h2_ft_str(int type) { switch (type) { case H2_FT_DATA : return "DATA"; case H2_FT_HEADERS : return "HEADERS"; case H2_FT_PRIORITY : return "PRIORITY"; case H2_FT_RST_STREAM : return "RST_STREAM"; case H2_FT_SETTINGS : return "SETTINGS"; case H2_FT_PUSH_PROMISE : return "PUSH_PROMISE"; case H2_FT_PING : return "PING"; case H2_FT_GOAWAY : return "GOAWAY"; case H2_FT_WINDOW_UPDATE : return "WINDOW_UPDATE"; default : return "_UNKNOWN_"; } } /* Returns an error code if the frame is valid protocol-wise, otherwise 0. * is the frame type (H2_FT_*), is the direction (1=req, 2=res), is * the stream ID from the frame header, is the frame length from the * header. The purpose is to be able to quickly return a PROTOCOL_ERROR or * FRAME_SIZE_ERROR connection error even for situations where the frame will * be ignored. must be the max frame size currently in place for the * protocol. */ static inline int h2_frame_check(enum h2_ft ft, int dir, int32_t id, int32_t len, int32_t mfs) { struct h2_frame_definition *fd; if (ft >= H2_FT_ENTRIES) return H2_ERR_NO_ERROR; // ignore unhandled frame types fd = &h2_frame_definition[ft]; if (!(dir & fd->dir)) return H2_ERR_PROTOCOL_ERROR; if (id < fd->min_id || id > fd->max_id) return H2_ERR_PROTOCOL_ERROR; if (len < fd->min_len || len > fd->max_len) return H2_ERR_FRAME_SIZE_ERROR; if (len > mfs) return H2_ERR_FRAME_SIZE_ERROR; if (ft == H2_FT_SETTINGS && (len % 6) != 0) return H2_ERR_FRAME_SIZE_ERROR; // RFC7540#6.5 return H2_ERR_NO_ERROR; } /* returns the pseudo-header corresponds to among H2_PHDR_IDX_*, 0 if not a * pseudo-header, or -1 if not a valid pseudo-header. */ static inline int h2_str_to_phdr(const struct ist str) { if (*str.ptr == ':') { if (isteq(str, ist(":path"))) return H2_PHDR_IDX_PATH; else if (isteq(str, ist(":method"))) return H2_PHDR_IDX_METH; else if (isteq(str, ist(":scheme"))) return H2_PHDR_IDX_SCHM; else if (isteq(str, ist(":status"))) return H2_PHDR_IDX_STAT; else if (isteq(str, ist(":authority"))) return H2_PHDR_IDX_AUTH; /* all other names starting with ':' */ return -1; } /* not a pseudo header */ return 0; } /* returns the pseudo-header name as a string, or ":UNKNOWN" if unknown */ static inline const char *h2_phdr_to_str(int phdr) { switch (phdr) { case H2_PHDR_IDX_NONE: return ":NONE"; case H2_PHDR_IDX_AUTH: return ":authority"; case H2_PHDR_IDX_METH: return ":method"; case H2_PHDR_IDX_PATH: return ":path"; case H2_PHDR_IDX_SCHM: return ":scheme"; case H2_PHDR_IDX_STAT: return ":status"; case H2_PHDR_IDX_HOST: return "Host"; default: return ":UNKNOWN"; } } #endif /* _COMMON_H2_H */ /* * Local variables: * c-indent-level: 8 * c-basic-offset: 8 * End: */