469 lines
12 KiB
C
469 lines
12 KiB
C
/** @file
|
|
@brief IPv4 related functions
|
|
|
|
This is not to be included by the application.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 2016 Intel Corporation
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#ifndef __IPV4_H
|
|
#define __IPV4_H
|
|
|
|
#include <zephyr/types.h>
|
|
|
|
#include <zephyr/net/net_ip.h>
|
|
#include <zephyr/net/net_pkt.h>
|
|
#include <zephyr/net/net_if.h>
|
|
#include <zephyr/net/net_context.h>
|
|
|
|
#define NET_IPV4_IHL_MASK 0x0F
|
|
#define NET_IPV4_DSCP_MASK 0xFC
|
|
#define NET_IPV4_DSCP_OFFSET 2
|
|
#define NET_IPV4_ECN_MASK 0x03
|
|
|
|
/* IPv4 Options */
|
|
#define NET_IPV4_OPTS_EO 0 /* End of Options */
|
|
#define NET_IPV4_OPTS_NOP 1 /* No operation */
|
|
#define NET_IPV4_OPTS_RR 7 /* Record Route */
|
|
#define NET_IPV4_OPTS_TS 68 /* Timestamp */
|
|
#define NET_IPV4_OPTS_RA 148 /* Router Alert */
|
|
|
|
/* IPv4 Options Timestamp flags */
|
|
#define NET_IPV4_TS_OPT_TS_ONLY 0 /* Timestamp only */
|
|
#define NET_IPV4_TS_OPT_TS_ADDR 1 /* Timestamp and address */
|
|
#define NET_IPV4_TS_OPT_TS_PRES 3 /* Timestamp prespecified hops*/
|
|
|
|
#define NET_IPV4_HDR_OPTNS_MAX_LEN 40
|
|
|
|
/* Fragment bits */
|
|
#define NET_IPV4_MF BIT(0) /* More fragments */
|
|
#define NET_IPV4_DF BIT(1) /* Do not fragment */
|
|
|
|
#define NET_IPV4_IGMP_QUERY 0x11 /* Membership query */
|
|
#define NET_IPV4_IGMP_REPORT_V1 0x12 /* v1 Membership report */
|
|
#define NET_IPV4_IGMP_REPORT_V2 0x16 /* v2 Membership report */
|
|
#define NET_IPV4_IGMP_LEAVE 0x17 /* v2 Leave group */
|
|
#define NET_IPV4_IGMP_REPORT_V3 0x22 /* v3 Membership report */
|
|
|
|
struct net_ipv4_igmp_v2_query {
|
|
/* IGMP message type */
|
|
uint8_t type;
|
|
/* Max response code */
|
|
uint8_t max_rsp;
|
|
/* 16-bit ones' complement of the entire message */
|
|
uint16_t chksum;
|
|
/* The multicast address being queried */
|
|
struct in_addr address;
|
|
} __packed;
|
|
|
|
struct net_ipv4_igmp_v2_report {
|
|
/* IGMP message type */
|
|
uint8_t type;
|
|
/* Max response code */
|
|
uint8_t max_rsp;
|
|
/* 16-bit ones' complement of the entire message */
|
|
uint16_t chksum;
|
|
/* The multicast address being queried */
|
|
struct in_addr address;
|
|
} __packed;
|
|
|
|
struct net_ipv4_igmp_v3_query {
|
|
/* IGMP message type */
|
|
uint8_t type;
|
|
/* Max response code */
|
|
uint8_t max_rsp;
|
|
/* 16-bit ones' complement of the entire message */
|
|
uint16_t chksum;
|
|
/* The multicast address being queried */
|
|
struct in_addr address;
|
|
/* Reserved field, ignore */
|
|
uint8_t reserved: 4;
|
|
/* Suppress Router-side Processing Flag */
|
|
uint8_t suppress: 1;
|
|
/* Querier's Robustness Variable */
|
|
uint8_t qrv: 3;
|
|
/* Querier's Query Interval Code */
|
|
uint8_t qqic;
|
|
/* Number of Source Addresses */
|
|
uint16_t sources_len;
|
|
} __packed;
|
|
|
|
struct net_ipv4_igmp_v3_group_record {
|
|
/* Record type */
|
|
uint8_t type;
|
|
/* Aux Data Len */
|
|
uint8_t aux_len;
|
|
/* Number of Source Addresses */
|
|
uint16_t sources_len;
|
|
/* The multicast address to report to*/
|
|
struct in_addr address;
|
|
} __packed;
|
|
|
|
struct net_ipv4_igmp_v3_report {
|
|
/* IGMP message type */
|
|
uint8_t type;
|
|
/* Reserved field, ignore */
|
|
uint8_t reserved_1;
|
|
/* 16-bit ones' complement of the entire message */
|
|
uint16_t chksum;
|
|
/* Reserved field, ignore */
|
|
uint16_t reserved_2;
|
|
/* Number of Group Records */
|
|
uint16_t groups_len;
|
|
} __packed;
|
|
|
|
/**
|
|
* @brief Create IPv4 packet in provided net_pkt with option to set all the
|
|
* caller settable values.
|
|
*
|
|
* @param pkt Network packet
|
|
* @param src Source IPv4 address
|
|
* @param dst Destination IPv4 address
|
|
* @param tos Type of service
|
|
* @param id Fragment id
|
|
* @param flags Fragmentation flags
|
|
* @param offset Fragment offset
|
|
*
|
|
* @return 0 on success, negative errno otherwise.
|
|
*/
|
|
#if defined(CONFIG_NET_NATIVE_IPV4)
|
|
int net_ipv4_create_full(struct net_pkt *pkt,
|
|
const struct in_addr *src,
|
|
const struct in_addr *dst,
|
|
uint8_t tos,
|
|
uint16_t id,
|
|
uint8_t flags,
|
|
uint16_t offset);
|
|
#else
|
|
static inline int net_ipv4_create_full(struct net_pkt *pkt,
|
|
const struct in_addr *src,
|
|
const struct in_addr *dst,
|
|
uint8_t tos,
|
|
uint16_t id,
|
|
uint8_t flags,
|
|
uint16_t offset)
|
|
{
|
|
ARG_UNUSED(pkt);
|
|
ARG_UNUSED(src);
|
|
ARG_UNUSED(dst);
|
|
ARG_UNUSED(tos);
|
|
ARG_UNUSED(id);
|
|
ARG_UNUSED(flags);
|
|
ARG_UNUSED(offset);
|
|
|
|
return -ENOTSUP;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @brief Create IPv4 packet in provided net_pkt.
|
|
*
|
|
* @param pkt Network packet
|
|
* @param src Source IPv4 address
|
|
* @param dst Destination IPv4 address
|
|
*
|
|
* @return 0 on success, negative errno otherwise.
|
|
*/
|
|
#if defined(CONFIG_NET_NATIVE_IPV4)
|
|
int net_ipv4_create(struct net_pkt *pkt,
|
|
const struct in_addr *src,
|
|
const struct in_addr *dst);
|
|
#else
|
|
static inline int net_ipv4_create(struct net_pkt *pkt,
|
|
const struct in_addr *src,
|
|
const struct in_addr *dst)
|
|
{
|
|
ARG_UNUSED(pkt);
|
|
ARG_UNUSED(src);
|
|
ARG_UNUSED(dst);
|
|
|
|
return -ENOTSUP;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @brief Finalize IPv4 packet. It should be called right before
|
|
* sending the packet and after all the data has been added into
|
|
* the packet. This function will set the length of the
|
|
* packet and calculate the higher protocol checksum if needed.
|
|
*
|
|
* @param pkt Network packet
|
|
* @param next_header_proto Protocol type of the next header after IPv4 header.
|
|
*
|
|
* @return 0 on success, negative errno otherwise.
|
|
*/
|
|
#if defined(CONFIG_NET_NATIVE_IPV4)
|
|
int net_ipv4_finalize(struct net_pkt *pkt, uint8_t next_header_proto);
|
|
#else
|
|
static inline int net_ipv4_finalize(struct net_pkt *pkt,
|
|
uint8_t next_header_proto)
|
|
{
|
|
ARG_UNUSED(pkt);
|
|
ARG_UNUSED(next_header_proto);
|
|
|
|
return -ENOTSUP;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @typedef net_ipv4_parse_hdr_options_cb_t
|
|
* @brief IPv4 header options handle callback
|
|
*
|
|
* @details The callback is called when parser encounter
|
|
* supported options.
|
|
*
|
|
* @param opt_type Option type
|
|
* @param opt_data Option data
|
|
* @param opt_len Option length
|
|
* @param user_data Userdata given in net_ipv4_parse_hdr_options()
|
|
*
|
|
* @return 0 on success, negative otherwise.
|
|
*/
|
|
typedef int (*net_ipv4_parse_hdr_options_cb_t)(uint8_t opt_type,
|
|
uint8_t *opt_data,
|
|
uint8_t opt_len,
|
|
void *user_data);
|
|
|
|
/**
|
|
* @brief Parse IPv4 header options.
|
|
* Parse the IPv4 header options and call the callback with
|
|
* options type, data and length along with user_data.
|
|
*
|
|
* @param pkt Network packet
|
|
* @param cb callback to handle IPv4 header options
|
|
* @param user_data User data
|
|
*
|
|
* @return 0 on success, negative otherwise.
|
|
*/
|
|
#if defined(CONFIG_NET_IPV4_HDR_OPTIONS)
|
|
int net_ipv4_parse_hdr_options(struct net_pkt *pkt,
|
|
net_ipv4_parse_hdr_options_cb_t cb,
|
|
void *user_data);
|
|
#else
|
|
static inline int net_ipv4_parse_hdr_options(struct net_pkt *pkt,
|
|
net_ipv4_parse_hdr_options_cb_t cb,
|
|
void *user_data)
|
|
{
|
|
ARG_UNUSED(pkt);
|
|
ARG_UNUSED(cb);
|
|
ARG_UNUSED(user_data);
|
|
|
|
return -ENOTSUP;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @brief Decode DSCP value from ToS field.
|
|
*
|
|
* @param tos ToS field value from the IPv4 header.
|
|
*
|
|
* @return Decoded DSCP value.
|
|
*/
|
|
static inline uint8_t net_ipv4_get_dscp(uint8_t tos)
|
|
{
|
|
return (tos & NET_IPV4_DSCP_MASK) >> NET_IPV4_DSCP_OFFSET;
|
|
}
|
|
|
|
/**
|
|
* @brief Encode DSCP value into ToS field.
|
|
*
|
|
* @param tos A pointer to the ToS field.
|
|
* @param dscp DSCP value to set.
|
|
*/
|
|
static inline void net_ipv4_set_dscp(uint8_t *tos, uint8_t dscp)
|
|
{
|
|
*tos &= ~NET_IPV4_DSCP_MASK;
|
|
*tos |= (dscp << NET_IPV4_DSCP_OFFSET) & NET_IPV4_DSCP_MASK;
|
|
}
|
|
|
|
/**
|
|
* @brief Convert DSCP value to priority.
|
|
*
|
|
* @param dscp DSCP value.
|
|
*/
|
|
static inline uint8_t net_ipv4_dscp_to_priority(uint8_t dscp)
|
|
{
|
|
return dscp >> 3;
|
|
}
|
|
|
|
/**
|
|
* @brief Decode ECN value from ToS field.
|
|
*
|
|
* @param tos ToS field value from the IPv4 header.
|
|
*
|
|
* @return Decoded ECN value.
|
|
*/
|
|
static inline uint8_t net_ipv4_get_ecn(uint8_t tos)
|
|
{
|
|
return tos & NET_IPV4_ECN_MASK;
|
|
}
|
|
|
|
/**
|
|
* @brief Encode ECN value into ToS field.
|
|
*
|
|
* @param tos A pointer to the ToS field.
|
|
* @param ecn ECN value to set.
|
|
*/
|
|
static inline void net_ipv4_set_ecn(uint8_t *tos, uint8_t ecn)
|
|
{
|
|
*tos &= ~NET_IPV4_ECN_MASK;
|
|
*tos |= ecn & NET_IPV4_ECN_MASK;
|
|
}
|
|
|
|
#if defined(CONFIG_NET_IPV4_FRAGMENT)
|
|
/** Store pending IPv4 fragment information that is needed for reassembly. */
|
|
struct net_ipv4_reassembly {
|
|
/** IPv4 source address of the fragment */
|
|
struct in_addr src;
|
|
|
|
/** IPv4 destination address of the fragment */
|
|
struct in_addr dst;
|
|
|
|
/**
|
|
* Timeout for cancelling the reassembly. The timer is used
|
|
* also to detect if this reassembly slot is used or not.
|
|
*/
|
|
struct k_work_delayable timer;
|
|
|
|
/** Pointers to pending fragments */
|
|
struct net_pkt *pkt[CONFIG_NET_IPV4_FRAGMENT_MAX_PKT];
|
|
|
|
/** IPv4 fragment identification */
|
|
uint16_t id;
|
|
uint8_t protocol;
|
|
};
|
|
#else
|
|
struct net_ipv4_reassembly;
|
|
#endif
|
|
|
|
/**
|
|
* @typedef net_ipv4_frag_cb_t
|
|
* @brief Callback used while iterating over pending IPv4 fragments.
|
|
*
|
|
* @param reass IPv4 fragment reassembly struct
|
|
* @param user_data A valid pointer on some user data or NULL
|
|
*/
|
|
typedef void (*net_ipv4_frag_cb_t)(struct net_ipv4_reassembly *reass, void *user_data);
|
|
|
|
/**
|
|
* @brief Go through all the currently pending IPv4 fragments.
|
|
*
|
|
* @param cb Callback to call for each pending IPv4 fragment.
|
|
* @param user_data User specified data or NULL.
|
|
*/
|
|
void net_ipv4_frag_foreach(net_ipv4_frag_cb_t cb, void *user_data);
|
|
|
|
#if defined(CONFIG_NET_NATIVE_IPV4)
|
|
/**
|
|
* @brief Initialises IPv4
|
|
*/
|
|
void net_ipv4_init(void);
|
|
|
|
/**
|
|
* @brief Handles IPv4 fragmented packets.
|
|
*
|
|
* @param pkt Network head packet.
|
|
* @param hdr The IPv4 header of the current packet
|
|
*
|
|
* @return Return verdict about the packet.
|
|
*/
|
|
#if defined(CONFIG_NET_IPV4_FRAGMENT)
|
|
enum net_verdict net_ipv4_handle_fragment_hdr(struct net_pkt *pkt, struct net_ipv4_hdr *hdr);
|
|
#else
|
|
static inline enum net_verdict net_ipv4_handle_fragment_hdr(struct net_pkt *pkt,
|
|
struct net_ipv4_hdr *hdr)
|
|
{
|
|
ARG_UNUSED(pkt);
|
|
ARG_UNUSED(hdr);
|
|
|
|
return NET_DROP;
|
|
}
|
|
#endif /* CONFIG_NET_IPV4_FRAGMENT */
|
|
|
|
/**
|
|
* @brief Prepare packet for sending, this will split up a packet that is too large to send into
|
|
* multiple fragments so that it can be sent.
|
|
*
|
|
* @param pkt Network packet
|
|
*
|
|
* @return Return verdict about the packet.
|
|
*/
|
|
#if defined(CONFIG_NET_IPV4_FRAGMENT)
|
|
enum net_verdict net_ipv4_prepare_for_send(struct net_pkt *pkt);
|
|
#else
|
|
static inline enum net_verdict net_ipv4_prepare_for_send(struct net_pkt *pkt)
|
|
{
|
|
return NET_OK;
|
|
}
|
|
#endif /* CONFIG_NET_IPV4_FRAGMENT */
|
|
|
|
/**
|
|
* @brief Sets up fragment buffers for usage, should only be called by the SYS_INIT() handler in
|
|
* net_core.c
|
|
*/
|
|
#if defined(CONFIG_NET_IPV4_FRAGMENT)
|
|
void net_ipv4_setup_fragment_buffers(void);
|
|
#else
|
|
static inline void net_ipv4_setup_fragment_buffers(void)
|
|
{
|
|
}
|
|
#endif /* CONFIG_NET_IPV4_FRAGMENT */
|
|
#else
|
|
#define net_ipv4_init(...)
|
|
#endif /* CONFIG_NET_NATIVE_IPV4 */
|
|
|
|
/**
|
|
* @brief Starts address conflict detection for an IPv4 address.
|
|
*
|
|
* @param iface Network interface the address belongs to.
|
|
* @param ifaddr IPv4 address to probe.
|
|
*
|
|
* @return 0 on success, negative otherwise.
|
|
*/
|
|
int net_ipv4_acd_start(struct net_if *iface, struct net_if_addr *ifaddr);
|
|
|
|
/**
|
|
* @brief Cancel address conflict detection for an IPv4 address.
|
|
*
|
|
* @param iface Network interface the address belongs to.
|
|
* @param ifaddr IPv4 address to probe.
|
|
*/
|
|
void net_ipv4_acd_cancel(struct net_if *iface, struct net_if_addr *ifaddr);
|
|
|
|
/**
|
|
* @brief Notify no conflict was detected for an IPv4 address.
|
|
*
|
|
* @param iface Network interface the address belongs to.
|
|
* @param ifaddr IPv4 address.
|
|
*/
|
|
void net_if_ipv4_acd_succeeded(struct net_if *iface, struct net_if_addr *ifaddr);
|
|
|
|
/**
|
|
* @brief Notify conflict for an IPv4 address.
|
|
*
|
|
* @param iface Network interface the address belongs to.
|
|
* @param ifaddr IPv4 address.
|
|
*/
|
|
void net_if_ipv4_acd_failed(struct net_if *iface, struct net_if_addr *ifaddr);
|
|
|
|
/**
|
|
* @brief Initialize IPv4 address conflict detection module.
|
|
*/
|
|
void net_ipv4_acd_init(void);
|
|
|
|
/**
|
|
* @brief Process ARP packet in terms of conflict detection.
|
|
*
|
|
* @param iface Network interface the packet was received on.
|
|
* @param pkt ARP packet to process.
|
|
*
|
|
* @return Return verdict about the packet.
|
|
*/
|
|
enum net_verdict net_ipv4_acd_input(struct net_if *iface, struct net_pkt *pkt);
|
|
|
|
#endif /* __IPV4_H */
|