cregit-Linux how code gets into the kernel

Release 4.12 include/net/6lowpan.h

Directory: include/net
/*
 * Copyright 2011, Siemens AG
 * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
 */

/*
 * Based on patches from Jon Smirl <jonsmirl@gmail.com>
 * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

/* Jon's code is based on 6lowpan implementation for Contiki which is:
 * Copyright (c) 2008, Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * 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.
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 THE INSTITUTE 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.
 */

#ifndef __6LOWPAN_H__

#define __6LOWPAN_H__

#include <linux/debugfs.h>

#include <net/ipv6.h>
#include <net/net_namespace.h>

/* special link-layer handling */
#include <net/mac802154.h>


#define EUI64_ADDR_LEN		8


#define LOWPAN_NHC_MAX_ID_LEN	1
/* Maximum next header compression length which we currently support inclusive
 * possible inline data.
 */

#define LOWPAN_NHC_MAX_HDR_LEN	(sizeof(struct udphdr))
/* Max IPHC Header len without IPv6 hdr specific inline data.
 * Useful for getting the "extra" bytes we need at worst case compression.
 *
 * LOWPAN_IPHC + CID + LOWPAN_NHC_MAX_ID_LEN
 */

#define LOWPAN_IPHC_MAX_HEADER_LEN	(2 + 1 + LOWPAN_NHC_MAX_ID_LEN)
/* Maximum worst case IPHC header buffer size */

#define LOWPAN_IPHC_MAX_HC_BUF_LEN	(sizeof(struct ipv6hdr) +       \
                                         LOWPAN_IPHC_MAX_HEADER_LEN +   \
                                         LOWPAN_NHC_MAX_HDR_LEN)
/* SCI/DCI is 4 bit width, so we have maximum 16 entries */

#define LOWPAN_IPHC_CTX_TABLE_SIZE	(1 << 4)


#define LOWPAN_DISPATCH_IPV6		0x41 
/* 01000001 = 65 */

#define LOWPAN_DISPATCH_IPHC		0x60 
/* 011xxxxx = ... */

#define LOWPAN_DISPATCH_IPHC_MASK	0xe0


static inline bool lowpan_is_ipv6(u8 dispatch) { return dispatch == LOWPAN_DISPATCH_IPV6; }

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Alexander Aring15100.00%1100.00%
Total15100.00%1100.00%


static inline bool lowpan_is_iphc(u8 dispatch) { return (dispatch & LOWPAN_DISPATCH_IPHC_MASK) == LOWPAN_DISPATCH_IPHC; }

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Alexander Aring19100.00%1100.00%
Total19100.00%1100.00%

#define LOWPAN_PRIV_SIZE(llpriv_size) \ (sizeof(struct lowpan_dev) + llpriv_size) enum lowpan_lltypes { LOWPAN_LLTYPE_BTLE, LOWPAN_LLTYPE_IEEE802154, }; enum lowpan_iphc_ctx_flags { LOWPAN_IPHC_CTX_FLAG_ACTIVE, LOWPAN_IPHC_CTX_FLAG_COMPRESSION, }; struct lowpan_iphc_ctx { u8 id; struct in6_addr pfx; u8 plen; unsigned long flags; }; struct lowpan_iphc_ctx_table { spinlock_t lock; const struct lowpan_iphc_ctx_ops *ops; struct lowpan_iphc_ctx table[LOWPAN_IPHC_CTX_TABLE_SIZE]; };
static inline bool lowpan_iphc_ctx_is_active(const struct lowpan_iphc_ctx *ctx) { return test_bit(LOWPAN_IPHC_CTX_FLAG_ACTIVE, &ctx->flags); }

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Alexander Aring24100.00%1100.00%
Total24100.00%1100.00%


static inline bool lowpan_iphc_ctx_is_compression(const struct lowpan_iphc_ctx *ctx) { return test_bit(LOWPAN_IPHC_CTX_FLAG_COMPRESSION, &ctx->flags); }

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Alexander Aring24100.00%1100.00%
Total24100.00%1100.00%

struct lowpan_dev { enum lowpan_lltypes lltype; struct dentry *iface_debugfs; struct lowpan_iphc_ctx_table ctx; /* must be last */ u8 priv[0] __aligned(sizeof(void *)); }; struct lowpan_802154_neigh { __le16 short_addr; };
static inline struct lowpan_802154_neigh *lowpan_802154_neigh(void *neigh_priv) { return neigh_priv; }

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Alexander Aring16100.00%1100.00%
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static inline struct lowpan_dev *lowpan_dev(const struct net_device *dev) { return netdev_priv(dev); }

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Alexander Aring21100.00%2100.00%
Total21100.00%2100.00%

/* private device info */ struct lowpan_802154_dev { struct net_device *wdev; /* wpan device ptr */ u16 fragment_tag; };
static inline struct lowpan_802154_dev *lowpan_802154_dev(const struct net_device *dev) { return (struct lowpan_802154_dev *)lowpan_dev(dev)->priv; }

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Alexander Aring28100.00%1100.00%
Total28100.00%1100.00%

struct lowpan_802154_cb { u16 d_tag; unsigned int d_size; u8 d_offset; };
static inline struct lowpan_802154_cb *lowpan_802154_cb(const struct sk_buff *skb) { BUILD_BUG_ON(sizeof(struct lowpan_802154_cb) > sizeof(skb->cb)); return (struct lowpan_802154_cb *)skb->cb; }

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Alexander Aring41100.00%1100.00%
Total41100.00%1100.00%


static inline void lowpan_iphc_uncompress_eui64_lladdr(struct in6_addr *ipaddr, const void *lladdr) { /* fe:80::XXXX:XXXX:XXXX:XXXX * \_________________/ * hwaddr */ ipaddr->s6_addr[0] = 0xFE; ipaddr->s6_addr[1] = 0x80; memcpy(&ipaddr->s6_addr[8], lladdr, EUI64_ADDR_LEN); /* second bit-flip (Universe/Local) * is done according RFC2464 */ ipaddr->s6_addr[8] ^= 0x02; }

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Alexander Aring5386.89%150.00%
Luiz Augusto von Dentz813.11%150.00%
Total61100.00%2100.00%


static inline void lowpan_iphc_uncompress_eui48_lladdr(struct in6_addr *ipaddr, const void *lladdr) { /* fe:80::XXXX:XXff:feXX:XXXX * \_________________/ * hwaddr */ ipaddr->s6_addr[0] = 0xFE; ipaddr->s6_addr[1] = 0x80; memcpy(&ipaddr->s6_addr[8], lladdr, 3); ipaddr->s6_addr[11] = 0xFF; ipaddr->s6_addr[12] = 0xFE; memcpy(&ipaddr->s6_addr[13], lladdr + 3, 3); }

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Luiz Augusto von Dentz8598.84%150.00%
Alexander Aring11.16%150.00%
Total86100.00%2100.00%

#ifdef DEBUG /* print data in line */
static inline void raw_dump_inline(const char *caller, char *msg, const unsigned char *buf, int len) { if (msg) pr_debug("%s():%s: ", caller, msg); print_hex_dump_debug("", DUMP_PREFIX_NONE, 16, 1, buf, len, false); }

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Alexander Aring55100.00%2100.00%
Total55100.00%2100.00%

/* print data in a table format: * * addr: xx xx xx xx xx xx * addr: xx xx xx xx xx xx * ... */
static inline void raw_dump_table(const char *caller, char *msg, const unsigned char *buf, int len) { if (msg) pr_debug("%s():%s:\n", caller, msg); print_hex_dump_debug("\t", DUMP_PREFIX_OFFSET, 16, 1, buf, len, false); }

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Alexander Aring55100.00%2100.00%
Total55100.00%2100.00%

#else
static inline void raw_dump_table(const char *caller, char *msg, const unsigned char *buf, int len) { }

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Alexander Aring24100.00%2100.00%
Total24100.00%2100.00%


static inline void raw_dump_inline(const char *caller, char *msg, const unsigned char *buf, int len) { }

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Alexander Aring24100.00%2100.00%
Total24100.00%2100.00%

#endif /** * lowpan_fetch_skb - getting inline data from 6LoWPAN header * * This function will pull data from sk buffer and put it into data to * remove the 6LoWPAN inline data. This function returns true if the * sk buffer is too small to pull the amount of data which is specified * by len. * * @skb: the buffer where the inline data should be pulled from. * @data: destination buffer for the inline data. * @len: amount of data which should be pulled in bytes. */
static inline bool lowpan_fetch_skb(struct sk_buff *skb, void *data, unsigned int len) { if (unlikely(!pskb_may_pull(skb, len))) return true; skb_copy_from_linear_data(skb, data, len); skb_pull(skb, len); return false; }

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Alexander Aring55100.00%1100.00%
Total55100.00%1100.00%


static inline bool lowpan_802154_is_valid_src_short_addr(__le16 addr) { /* First bit of addr is multicast, reserved or 802.15.4 specific */ return !(addr & cpu_to_le16(0x8000)); }

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Alexander Aring22100.00%1100.00%
Total22100.00%1100.00%


static inline void lowpan_push_hc_data(u8 **hc_ptr, const void *data, const size_t len) { memcpy(*hc_ptr, data, len); *hc_ptr += len; }

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Alexander Aring36100.00%1100.00%
Total36100.00%1100.00%

int lowpan_register_netdevice(struct net_device *dev, enum lowpan_lltypes lltype); int lowpan_register_netdev(struct net_device *dev, enum lowpan_lltypes lltype); void lowpan_unregister_netdevice(struct net_device *dev); void lowpan_unregister_netdev(struct net_device *dev); /** * lowpan_header_decompress - replace 6LoWPAN header with IPv6 header * * This function replaces the IPHC 6LoWPAN header which should be pointed at * skb->data and skb_network_header, with the IPv6 header. * It would be nice that the caller have the necessary headroom of IPv6 header * and greatest Transport layer header, this would reduce the overhead for * reallocate headroom. * * @skb: the buffer which should be manipulate. * @dev: the lowpan net device pointer. * @daddr: destination lladdr of mac header which is used for compression * methods. * @saddr: source lladdr of mac header which is used for compression * methods. */ int lowpan_header_decompress(struct sk_buff *skb, const struct net_device *dev, const void *daddr, const void *saddr); /** * lowpan_header_compress - replace IPv6 header with 6LoWPAN header * * This function replaces the IPv6 header which should be pointed at * skb->data and skb_network_header, with the IPHC 6LoWPAN header. * The caller need to be sure that the sk buffer is not shared and at have * at least a headroom which is smaller or equal LOWPAN_IPHC_MAX_HEADER_LEN, * which is the IPHC "more bytes than IPv6 header" at worst case. * * @skb: the buffer which should be manipulate. * @dev: the lowpan net device pointer. * @daddr: destination lladdr of mac header which is used for compression * methods. * @saddr: source lladdr of mac header which is used for compression * methods. */ int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev, const void *daddr, const void *saddr); #endif /* __6LOWPAN_H__ */

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Alexander Aring75182.17%2180.77%
Luiz Augusto von Dentz9310.18%13.85%
Jukka Rissanen414.49%13.85%
Alexander Smirnov252.74%13.85%
Luis R. Rodriguez30.33%13.85%
Martin Townsend10.11%13.85%
Total914100.00%26100.00%
Directory: include/net
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