diff options
Diffstat (limited to 'net/ieee802154/6lowpan.c')
| -rw-r--r-- | net/ieee802154/6lowpan.c | 1239 |
1 files changed, 0 insertions, 1239 deletions
diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c deleted file mode 100644 index e4ecc1eef98..00000000000 --- a/net/ieee802154/6lowpan.c +++ /dev/null @@ -1,1239 +0,0 @@ -/* - * 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. - */ - -#include <linux/bitops.h> -#include <linux/if_arp.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/netdevice.h> -#include <net/af_ieee802154.h> -#include <net/ieee802154.h> -#include <net/ieee802154_netdev.h> -#include <net/ipv6.h> - -#include "6lowpan.h" - -/* TTL uncompression values */ -static const u8 lowpan_ttl_values[] = {0, 1, 64, 255}; - -static LIST_HEAD(lowpan_devices); - -/* - * Uncompression of linklocal: - * 0 -> 16 bytes from packet - * 1 -> 2 bytes from prefix - bunch of zeroes and 8 from packet - * 2 -> 2 bytes from prefix - zeroes + 2 from packet - * 3 -> 2 bytes from prefix - infer 8 bytes from lladdr - * - * NOTE: => the uncompress function does change 0xf to 0x10 - * NOTE: 0x00 => no-autoconfig => unspecified - */ -static const u8 lowpan_unc_llconf[] = {0x0f, 0x28, 0x22, 0x20}; - -/* - * Uncompression of ctx-based: - * 0 -> 0 bits from packet [unspecified / reserved] - * 1 -> 8 bytes from prefix - bunch of zeroes and 8 from packet - * 2 -> 8 bytes from prefix - zeroes + 2 from packet - * 3 -> 8 bytes from prefix - infer 8 bytes from lladdr - */ -static const u8 lowpan_unc_ctxconf[] = {0x00, 0x88, 0x82, 0x80}; - -/* - * Uncompression of ctx-base - * 0 -> 0 bits from packet - * 1 -> 2 bytes from prefix - bunch of zeroes 5 from packet - * 2 -> 2 bytes from prefix - zeroes + 3 from packet - * 3 -> 2 bytes from prefix - infer 1 bytes from lladdr - */ -static const u8 lowpan_unc_mxconf[] = {0x0f, 0x25, 0x23, 0x21}; - -/* Link local prefix */ -static const u8 lowpan_llprefix[] = {0xfe, 0x80}; - -/* private device info */ -struct lowpan_dev_info { - struct net_device *real_dev; /* real WPAN device ptr */ - struct mutex dev_list_mtx; /* mutex for list ops */ -}; - -struct lowpan_dev_record { - struct net_device *ldev; - struct list_head list; -}; - -struct lowpan_fragment { - struct sk_buff *skb; /* skb to be assembled */ - spinlock_t lock; /* concurency lock */ - u16 length; /* length to be assemled */ - u32 bytes_rcv; /* bytes received */ - u16 tag; /* current fragment tag */ - struct timer_list timer; /* assembling timer */ - struct list_head list; /* fragments list */ -}; - -static unsigned short fragment_tag; -static LIST_HEAD(lowpan_fragments); -spinlock_t flist_lock; - -static inline struct -lowpan_dev_info *lowpan_dev_info(const struct net_device *dev) -{ - return netdev_priv(dev); -} - -static inline void lowpan_address_flip(u8 *src, u8 *dest) -{ - int i; - for (i = 0; i < IEEE802154_ADDR_LEN; i++) - (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i]; -} - -/* list of all 6lowpan devices, uses for package delivering */ -/* print data in line */ -static inline void lowpan_raw_dump_inline(const char *caller, char *msg, - unsigned char *buf, int len) -{ -#ifdef DEBUG - if (msg) - pr_debug("(%s) %s: ", caller, msg); - print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, - 16, 1, buf, len, false); -#endif /* DEBUG */ -} - -/* - * print data in a table format: - * - * addr: xx xx xx xx xx xx - * addr: xx xx xx xx xx xx - * ... - */ -static inline void lowpan_raw_dump_table(const char *caller, char *msg, - unsigned char *buf, int len) -{ -#ifdef DEBUG - if (msg) - pr_debug("(%s) %s:\n", caller, msg); - print_hex_dump(KERN_DEBUG, "\t", DUMP_PREFIX_OFFSET, - 16, 1, buf, len, false); -#endif /* DEBUG */ -} - -static u8 -lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr, - const unsigned char *lladdr) -{ - u8 val = 0; - - if (is_addr_mac_addr_based(ipaddr, lladdr)) - val = 3; /* 0-bits */ - else if (lowpan_is_iid_16_bit_compressable(ipaddr)) { - /* compress IID to 16 bits xxxx::XXXX */ - memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2); - *hc06_ptr += 2; - val = 2; /* 16-bits */ - } else { - /* do not compress IID => xxxx::IID */ - memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8); - *hc06_ptr += 8; - val = 1; /* 64-bits */ - } - - return rol8(val, shift); -} - -static void -lowpan_uip_ds6_set_addr_iid(struct in6_addr *ipaddr, unsigned char *lladdr) -{ - memcpy(&ipaddr->s6_addr[8], lladdr, IEEE802154_ALEN); - /* second bit-flip (Universe/Local) is done according RFC2464 */ - ipaddr->s6_addr[8] ^= 0x02; -} - -/* - * Uncompress addresses based on a prefix and a postfix with zeroes in - * between. If the postfix is zero in length it will use the link address - * to configure the IP address (autoconf style). - * pref_post_count takes a byte where the first nibble specify prefix count - * and the second postfix count (NOTE: 15/0xf => 16 bytes copy). - */ -static int -lowpan_uncompress_addr(struct sk_buff *skb, struct in6_addr *ipaddr, - u8 const *prefix, u8 pref_post_count, unsigned char *lladdr) -{ - u8 prefcount = pref_post_count >> 4; - u8 postcount = pref_post_count & 0x0f; - - /* full nibble 15 => 16 */ - prefcount = (prefcount == 15 ? 16 : prefcount); - postcount = (postcount == 15 ? 16 : postcount); - - if (lladdr) - lowpan_raw_dump_inline(__func__, "linklocal address", - lladdr, IEEE802154_ALEN); - if (prefcount > 0) - memcpy(ipaddr, prefix, prefcount); - - if (prefcount + postcount < 16) - memset(&ipaddr->s6_addr[prefcount], 0, - 16 - (prefcount + postcount)); - - if (postcount > 0) { - memcpy(&ipaddr->s6_addr[16 - postcount], skb->data, postcount); - skb_pull(skb, postcount); - } else if (prefcount > 0) { - if (lladdr == NULL) - return -EINVAL; - - /* no IID based configuration if no prefix and no data */ - lowpan_uip_ds6_set_addr_iid(ipaddr, lladdr); - } - - pr_debug("(%s): uncompressing %d + %d => ", __func__, prefcount, - postcount); - lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16); - - return 0; -} - -static void -lowpan_compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb) -{ - struct udphdr *uh = udp_hdr(skb); - - pr_debug("(%s): UDP header compression\n", __func__); - - if (((uh->source & LOWPAN_NHC_UDP_4BIT_MASK) == - LOWPAN_NHC_UDP_4BIT_PORT) && - ((uh->dest & LOWPAN_NHC_UDP_4BIT_MASK) == - LOWPAN_NHC_UDP_4BIT_PORT)) { - pr_debug("(%s): both ports compression to 4 bits\n", __func__); - **hc06_ptr = LOWPAN_NHC_UDP_CS_P_11; - **(hc06_ptr + 1) = /* subtraction is faster */ - (u8)((uh->dest - LOWPAN_NHC_UDP_4BIT_PORT) + - ((uh->source & LOWPAN_NHC_UDP_4BIT_PORT) << 4)); - *hc06_ptr += 2; - } else if ((uh->dest & LOWPAN_NHC_UDP_8BIT_MASK) == - LOWPAN_NHC_UDP_8BIT_PORT) { - pr_debug("(%s): remove 8 bits of dest\n", __func__); - **hc06_ptr = LOWPAN_NHC_UDP_CS_P_01; - memcpy(*hc06_ptr + 1, &uh->source, 2); - **(hc06_ptr + 3) = (u8)(uh->dest - LOWPAN_NHC_UDP_8BIT_PORT); - *hc06_ptr += 4; - } else if ((uh->source & LOWPAN_NHC_UDP_8BIT_MASK) == - LOWPAN_NHC_UDP_8BIT_PORT) { - pr_debug("(%s): remove 8 bits of source\n", __func__); - **hc06_ptr = LOWPAN_NHC_UDP_CS_P_10; - memcpy(*hc06_ptr + 1, &uh->dest, 2); - **(hc06_ptr + 3) = (u8)(uh->source - LOWPAN_NHC_UDP_8BIT_PORT); - *hc06_ptr += 4; - } else { - pr_debug("(%s): can't compress header\n", __func__); - **hc06_ptr = LOWPAN_NHC_UDP_CS_P_00; - memcpy(*hc06_ptr + 1, &uh->source, 2); - memcpy(*hc06_ptr + 3, &uh->dest, 2); - *hc06_ptr += 5; - } - - /* checksum is always inline */ - memcpy(*hc06_ptr, &uh->check, 2); - *hc06_ptr += 2; -} - -static u8 lowpan_fetch_skb_u8(struct sk_buff *skb) -{ - u8 ret; - - ret = skb->data[0]; - skb_pull(skb, 1); - - return ret; -} - -static u16 lowpan_fetch_skb_u16(struct sk_buff *skb) -{ - u16 ret; - - BUG_ON(!pskb_may_pull(skb, 2)); - - ret = skb->data[0] | (skb->data[1] << 8); - skb_pull(skb, 2); - return ret; -} - -static int -lowpan_uncompress_udp_header(struct sk_buff *skb) -{ - struct udphdr *uh = udp_hdr(skb); - u8 tmp; - - tmp = lowpan_fetch_skb_u8(skb); - - if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) { - pr_debug("(%s): UDP header uncompression\n", __func__); - switch (tmp & LOWPAN_NHC_UDP_CS_P_11) { - case LOWPAN_NHC_UDP_CS_P_00: - memcpy(&uh->source, &skb->data[0], 2); - memcpy(&uh->dest, &skb->data[2], 2); - skb_pull(skb, 4); - break; - case LOWPAN_NHC_UDP_CS_P_01: - memcpy(&uh->source, &skb->data[0], 2); - uh->dest = - skb->data[2] + LOWPAN_NHC_UDP_8BIT_PORT; - skb_pull(skb, 3); - break; - case LOWPAN_NHC_UDP_CS_P_10: - uh->source = skb->data[0] + LOWPAN_NHC_UDP_8BIT_PORT; - memcpy(&uh->dest, &skb->data[1], 2); - skb_pull(skb, 3); - break; - case LOWPAN_NHC_UDP_CS_P_11: - uh->source = - LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] >> 4); - uh->dest = - LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] & 0x0f); - skb_pull(skb, 1); - break; - default: - pr_debug("(%s) ERROR: unknown UDP format\n", __func__); - goto err; - break; - } - - pr_debug("(%s): uncompressed UDP ports: src = %d, dst = %d\n", - __func__, uh->source, uh->dest); - - /* copy checksum */ - memcpy(&uh->check, &skb->data[0], 2); - skb_pull(skb, 2); - } else { - pr_debug("(%s): ERROR: unsupported NH format\n", __func__); - goto err; - } - - return 0; -err: - return -EINVAL; -} - -static int lowpan_header_create(struct sk_buff *skb, - struct net_device *dev, - unsigned short type, const void *_daddr, - const void *_saddr, unsigned len) -{ - u8 tmp, iphc0, iphc1, *hc06_ptr; - struct ipv6hdr *hdr; - const u8 *saddr = _saddr; - const u8 *daddr = _daddr; - u8 *head; - struct ieee802154_addr sa, da; - - if (type != ETH_P_IPV6) - return 0; - /* TODO: - * if this package isn't ipv6 one, where should it be routed? - */ - head = kzalloc(100, GFP_KERNEL); - if (head == NULL) - return -ENOMEM; - - hdr = ipv6_hdr(skb); - hc06_ptr = head + 2; - - pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" - "\tnexthdr = 0x%02x\n\thop_lim = %d\n", __func__, - hdr->version, ntohs(hdr->payload_len), hdr->nexthdr, - hdr->hop_limit); - - lowpan_raw_dump_table(__func__, "raw skb network header dump", - skb_network_header(skb), sizeof(struct ipv6hdr)); - - if (!saddr) - saddr = dev->dev_addr; - - lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); - - /* - * As we copy some bit-length fields, in the IPHC encoding bytes, - * we sometimes use |= - * If the field is 0, and the current bit value in memory is 1, - * this does not work. We therefore reset the IPHC encoding here - */ - iphc0 = LOWPAN_DISPATCH_IPHC; - iphc1 = 0; - - /* TODO: context lookup */ - - lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); - - /* - * Traffic class, flow label - * If flow label is 0, compress it. If traffic class is 0, compress it - * We have to process both in the same time as the offset of traffic - * class depends on the presence of version and flow label - */ - - /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */ - tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4); - tmp = ((tmp & 0x03) << 6) | (tmp >> 2); - - if (((hdr->flow_lbl[0] & 0x0F) == 0) && - (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) { - /* flow label can be compressed */ - iphc0 |= LOWPAN_IPHC_FL_C; - if ((hdr->priority == 0) && - ((hdr->flow_lbl[0] & 0xF0) == 0)) { - /* compress (elide) all */ - iphc0 |= LOWPAN_IPHC_TC_C; - } else { - /* compress only the flow label */ - *hc06_ptr = tmp; - hc06_ptr += 1; - } - } else { - /* Flow label cannot be compressed */ - if ((hdr->priority == 0) && - ((hdr->flow_lbl[0] & 0xF0) == 0)) { - /* compress only traffic class */ - iphc0 |= LOWPAN_IPHC_TC_C; - *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F); - memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2); - hc06_ptr += 3; - } else { - /* compress nothing */ - memcpy(hc06_ptr, &hdr, 4); - /* replace the top byte with new ECN | DSCP format */ - *hc06_ptr = tmp; - hc06_ptr += 4; - } - } - - /* NOTE: payload length is always compressed */ - - /* Next Header is compress if UDP */ - if (hdr->nexthdr == UIP_PROTO_UDP) - iphc0 |= LOWPAN_IPHC_NH_C; - - if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { - *hc06_ptr = hdr->nexthdr; - hc06_ptr += 1; - } - - /* - * Hop limit - * if 1: compress, encoding is 01 - * if 64: compress, encoding is 10 - * if 255: compress, encoding is 11 - * else do not compress - */ - switch (hdr->hop_limit) { - case 1: - iphc0 |= LOWPAN_IPHC_TTL_1; - break; - case 64: - iphc0 |= LOWPAN_IPHC_TTL_64; - break; - case 255: - iphc0 |= LOWPAN_IPHC_TTL_255; - break; - default: - *hc06_ptr = hdr->hop_limit; - break; - } - - /* source address compression */ - if (is_addr_unspecified(&hdr->saddr)) { - pr_debug("(%s): source address is unspecified, setting SAC\n", - __func__); - iphc1 |= LOWPAN_IPHC_SAC; - /* TODO: context lookup */ - } else if (is_addr_link_local(&hdr->saddr)) { - pr_debug("(%s): source address is link-local\n", __func__); - iphc1 |= lowpan_compress_addr_64(&hc06_ptr, - LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr); - } else { - pr_debug("(%s): send the full source address\n", __func__); - memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16); - hc06_ptr += 16; - } - - /* destination address compression */ - if (is_addr_mcast(&hdr->daddr)) { - pr_debug("(%s): destination address is multicast", __func__); - iphc1 |= LOWPAN_IPHC_M; - if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) { - pr_debug("compressed to 1 octet\n"); - iphc1 |= LOWPAN_IPHC_DAM_11; - /* use last byte */ - *hc06_ptr = hdr->daddr.s6_addr[15]; - hc06_ptr += 1; - } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) { - pr_debug("compressed to 4 octets\n"); - iphc1 |= LOWPAN_IPHC_DAM_10; - /* second byte + the last three */ - *hc06_ptr = hdr->daddr.s6_addr[1]; - memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3); - hc06_ptr += 4; - } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) { - pr_debug("compressed to 6 octets\n"); - iphc1 |= LOWPAN_IPHC_DAM_01; - /* second byte + the last five */ - *hc06_ptr = hdr->daddr.s6_addr[1]; - memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5); - hc06_ptr += 6; - } else { - pr_debug("using full address\n"); - iphc1 |= LOWPAN_IPHC_DAM_00; - memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16); - hc06_ptr += 16; - } - } else { - pr_debug("(%s): destination address is unicast: ", __func__); - /* TODO: context lookup */ - if (is_addr_link_local(&hdr->daddr)) { - pr_debug("destination address is link-local\n"); - iphc1 |= lowpan_compress_addr_64(&hc06_ptr, - LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr); - } else { - pr_debug("using full address\n"); - memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16); - hc06_ptr += 16; - } - } - - /* UDP header compression */ - if (hdr->nexthdr == UIP_PROTO_UDP) - lowpan_compress_udp_header(&hc06_ptr, skb); - - head[0] = iphc0; - head[1] = iphc1; - - skb_pull(skb, sizeof(struct ipv6hdr)); - memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head); - - kfree(head); - - lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, - skb->len); - - /* - * NOTE1: I'm still unsure about the fact that compression and WPAN - * header are created here and not later in the xmit. So wait for - * an opinion of net maintainers. - */ - /* - * NOTE2: to be absolutely correct, we must derive PANid information - * from MAC subif of the 'dev' and 'real_dev' network devices, but - * this isn't implemented in mainline yet, so currently we assign 0xff - */ - { - /* prepare wpan address data */ - sa.addr_type = IEEE802154_ADDR_LONG; - sa.pan_id = 0xff; - - da.addr_type = IEEE802154_ADDR_LONG; - da.pan_id = 0xff; - - memcpy(&(da.hwaddr), daddr, 8); - memcpy(&(sa.hwaddr), saddr, 8); - - mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA; - - return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev, - type, (void *)&da, (void *)&sa, skb->len); - } -} - -static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr) -{ - struct sk_buff *new; - struct lowpan_dev_record *entry; - int stat = NET_RX_SUCCESS; - - new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb), - GFP_ATOMIC); - kfree_skb(skb); - - if (!new) - return -ENOMEM; - - skb_push(new, sizeof(struct ipv6hdr)); - skb_reset_network_header(new); - skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr)); - - new->protocol = htons(ETH_P_IPV6); - new->pkt_type = PACKET_HOST; - - rcu_read_lock(); - list_for_each_entry_rcu(entry, &lowpan_devices, list) - if (lowpan_dev_info(entry->ldev)->real_dev == new->dev) { - skb = skb_copy(new, GFP_ATOMIC); - if (!skb) { - stat = -ENOMEM; - break; - } - - skb->dev = entry->ldev; - stat = netif_rx(skb); - } - rcu_read_unlock(); - - kfree_skb(new); - - return stat; -} - -static void lowpan_fragment_timer_expired(unsigned long entry_addr) -{ - struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr; - - pr_debug("%s: timer expired for frame with tag %d\n", __func__, - entry->tag); - - spin_lock(&flist_lock); - list_del(&entry->list); - spin_unlock(&flist_lock); - - dev_kfree_skb(entry->skb); - kfree(entry); -} - -static int -lowpan_process_data(struct sk_buff *skb) -{ - struct ipv6hdr hdr; - u8 tmp, iphc0, iphc1, num_context = 0; - u8 *_saddr, *_daddr; - int err; - - lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, - skb->len); - /* at least two bytes will be used for the encoding */ - if (skb->len < 2) - goto drop; - iphc0 = lowpan_fetch_skb_u8(skb); - - /* fragments assembling */ - switch (iphc0 & LOWPAN_DISPATCH_MASK) { - case LOWPAN_DISPATCH_FRAG1: - case LOWPAN_DISPATCH_FRAGN: - { - struct lowpan_fragment *frame; - u8 len, offset; - u16 tag; - bool found = false; - - len = lowpan_fetch_skb_u8(skb); /* frame length */ - tag = lowpan_fetch_skb_u16(skb); - - /* - * check if frame assembling with the same tag is - * already in progress - */ - spin_lock(&flist_lock); - - list_for_each_entry(frame, &lowpan_fragments, list) - if (frame->tag == tag) { - found = true; - break; - } - - /* alloc new frame structure */ - if (!found) { - frame = kzalloc(sizeof(struct lowpan_fragment), - GFP_ATOMIC); - if (!frame) - goto unlock_and_drop; - - INIT_LIST_HEAD(&frame->list); - - frame->length = (iphc0 & 7) | (len << 3); - frame->tag = tag; - - /* allocate buffer for frame assembling */ - frame->skb = alloc_skb(frame->length + - sizeof(struct ipv6hdr), GFP_ATOMIC); - - if (!frame->skb) { - kfree(frame); - goto unlock_and_drop; - } - - frame->skb->priority = skb->priority; - frame->skb->dev = skb->dev; - - /* reserve headroom for uncompressed ipv6 header */ - skb_reserve(frame->skb, sizeof(struct ipv6hdr)); - skb_put(frame->skb, frame->length); - - init_timer(&frame->timer); - /* time out is the same as for ipv6 - 60 sec */ - frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT; - frame->timer.data = (unsigned long)frame; - frame->timer.function = lowpan_fragment_timer_expired; - - add_timer(&frame->timer); - - list_add_tail(&frame->list, &lowpan_fragments); - } - - if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1) - goto unlock_and_drop; - - offset = lowpan_fetch_skb_u8(skb); /* fetch offset */ - - /* if payload fits buffer, copy it */ - if (likely((offset * 8 + skb->len) <= frame->length)) - skb_copy_to_linear_data_offset(frame->skb, offset * 8, - skb->data, skb->len); - else - goto unlock_and_drop; - - frame->bytes_rcv += skb->len; - - /* frame assembling complete */ - if ((frame->bytes_rcv == frame->length) && - frame->timer.expires > jiffies) { - /* if timer haven't expired - first of all delete it */ - del_timer(&frame->timer); - list_del(&frame->list); - spin_unlock(&flist_lock); - - dev_kfree_skb(skb); - skb = frame->skb; - kfree(frame); - iphc0 = lowpan_fetch_skb_u8(skb); - break; - } - spin_unlock(&flist_lock); - - return kfree_skb(skb), 0; - } - default: - break; - } - - iphc1 = lowpan_fetch_skb_u8(skb); - - _saddr = mac_cb(skb)->sa.hwaddr; - _daddr = mac_cb(skb)->da.hwaddr; - - pr_debug("(%s): iphc0 = %02x, iphc1 = %02x\n", __func__, iphc0, iphc1); - - /* another if the CID flag is set */ - if (iphc1 & LOWPAN_IPHC_CID) { - pr_debug("(%s): CID flag is set, increase header with one\n", - __func__); - if (!skb->len) - goto drop; - num_context = lowpan_fetch_skb_u8(skb); - } - - hdr.version = 6; - - /* Traffic Class and Flow Label */ - switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { - /* - * Traffic Class and FLow Label carried in-line - * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) - */ - case 0: /* 00b */ - if (!skb->len) - goto drop; - tmp = lowpan_fetch_skb_u8(skb); - memcpy(&hdr.flow_lbl, &skb->data[0], 3); - skb_pull(skb, 3); - hdr.priority = ((tmp >> 2) & 0x0f); - hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) | - (hdr.flow_lbl[0] & 0x0f); - break; - /* - * Traffic class carried in-line - * ECN + DSCP (1 byte), Flow Label is elided - */ - case 1: /* 10b */ - if (!skb->len) - goto drop; - tmp = lowpan_fetch_skb_u8(skb); - hdr.priority = ((tmp >> 2) & 0x0f); - hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30); - hdr.flow_lbl[1] = 0; - hdr.flow_lbl[2] = 0; - break; - /* - * Flow Label carried in-line - * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided - */ - case 2: /* 01b */ - if (!skb->len) - goto drop; - tmp = lowpan_fetch_skb_u8(skb); - hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30); - memcpy(&hdr.flow_lbl[1], &skb->data[0], 2); - skb_pull(skb, 2); - break; - /* Traffic Class and Flow Label are elided */ - case 3: /* 11b */ - hdr.priority = 0; - hdr.flow_lbl[0] = 0; - hdr.flow_lbl[1] = 0; - hdr.flow_lbl[2] = 0; - break; - default: - break; - } - - /* Next Header */ - if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { - /* Next header is carried inline */ - if (!skb->len) - goto drop; - hdr.nexthdr = lowpan_fetch_skb_u8(skb); - pr_debug("(%s): NH flag is set, next header is carried " - "inline: %02x\n", __func__, hdr.nexthdr); - } - - /* Hop Limit */ - if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) - hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03]; - else { - if (!skb->len) - goto drop; - hdr.hop_limit = lowpan_fetch_skb_u8(skb); - } - - /* Extract SAM to the tmp variable */ - tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03; - - /* Source address uncompression */ - pr_debug("(%s): source address stateless compression\n", __func__); - err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix, - lowpan_unc_llconf[tmp], skb->data); - if (err) - goto drop; - - /* Extract DAM to the tmp variable */ - tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03; - - /* check for Multicast Compression */ - if (iphc1 & LOWPAN_IPHC_M) { - if (iphc1 & LOWPAN_IPHC_DAC) { - pr_debug("(%s): destination address context-based " - "multicast compression\n", __func__); - /* TODO: implement this */ - } else { - u8 prefix[] = {0xff, 0x02}; - - pr_debug("(%s): destination address non-context-based" - " multicast compression\n", __func__); - if (0 < tmp && tmp < 3) { - if (!skb->len) - goto drop; - else - prefix[1] = lowpan_fetch_skb_u8(skb); - } - - err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix, - lowpan_unc_mxconf[tmp], NULL); - if (err) - goto drop; - } - } else { - pr_debug("(%s): destination address stateless compression\n", - __func__); - err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix, - lowpan_unc_llconf[tmp], skb->data); - if (err) - goto drop; - } - - /* UDP data uncompression */ - if (iphc0 & LOWPAN_IPHC_NH_C) - if (lowpan_uncompress_udp_header(skb)) - goto drop; - - /* Not fragmented package */ - hdr.payload_len = htons(skb->len); - - pr_debug("(%s): skb headroom size = %d, data length = %d\n", __func__, - skb_headroom(skb), skb->len); - - pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" - "nexthdr = 0x%02x\n\thop_lim = %d\n", __func__, hdr.version, - ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit); - - lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, - sizeof(hdr)); - return lowpan_skb_deliver(skb, &hdr); - -unlock_and_drop: - spin_unlock(&flist_lock); -drop: - kfree_skb(skb); - return -EINVAL; -} - -static int lowpan_set_address(struct net_device *dev, void *p) -{ - struct sockaddr *sa = p; - - if (netif_running(dev)) - return -EBUSY; - - /* TODO: validate addr */ - memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); - - return 0; -} - -static int lowpan_get_mac_header_length(struct sk_buff *skb) -{ - /* - * Currently long addressing mode is supported only, so the overall - * header size is 21: - * FC SeqNum DPAN DA SA Sec - * 2 + 1 + 2 + 8 + 8 + 0 = 21 - */ - return 21; -} - -static int -lowpan_fragment_xmit(struct sk_buff *skb, u8 *head, - int mlen, int plen, int offset) -{ - struct sk_buff *frag; - int hlen, ret; - - /* if payload length is zero, therefore it's a first fragment */ - hlen = (plen == 0 ? LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE); - - lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen); - - frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE); - if (!frag) - return -ENOMEM; - - frag->priority = skb->priority; - frag->dev = skb->dev; - - /* copy header, MFR and payload */ - memcpy(skb_put(frag, mlen), skb->data, mlen); - memcpy(skb_put(frag, hlen), head, hlen); - - if (plen) - skb_copy_from_linear_data_offset(skb, offset + mlen, - skb_put(frag, plen), plen); - - lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data, - frag->len); - - ret = dev_queue_xmit(frag); - - return ret; -} - -static int -lowpan_skb_fragmentation(struct sk_buff *skb) -{ - int err, header_length, payload_length, tag, offset = 0; - u8 head[5]; - - header_length = lowpan_get_mac_header_length(skb); - payload_length = skb->len - header_length; - tag = fragment_tag++; - - /* first fragment header */ - head[0] = LOWPAN_DISPATCH_FRAG1 | (payload_length & 0x7); - head[1] = (payload_length >> 3) & 0xff; - head[2] = tag & 0xff; - head[3] = tag >> 8; - - err = lowpan_fragment_xmit(skb, head, header_length, 0, 0); - - /* next fragment header */ - head[0] &= ~LOWPAN_DISPATCH_FRAG1; - head[0] |= LOWPAN_DISPATCH_FRAGN; - - while ((payload_length - offset > 0) && (err >= 0)) { - int len = LOWPAN_FRAG_SIZE; - - head[4] = offset / 8; - - if (payload_length - offset < len) - len = payload_length - offset; - - err = lowpan_fragment_xmit(skb, head, header_length, - len, offset); - offset += len; - } - - return err; -} - -static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev) -{ - int err = -1; - - pr_debug("(%s): package xmit\n", __func__); - - skb->dev = lowpan_dev_info(dev)->real_dev; - if (skb->dev == NULL) { - pr_debug("(%s) ERROR: no real wpan device found\n", __func__); - goto error; - } - - if (skb->len <= IEEE802154_MTU) { - err = dev_queue_xmit(skb); - goto out; - } - - pr_debug("(%s): frame is too big, fragmentation is needed\n", - __func__); - err = lowpan_skb_fragmentation(skb); -error: - dev_kfree_skb(skb); -out: - if (err < 0) - pr_debug("(%s): ERROR: xmit failed\n", __func__); - - return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK); -} - -static void lowpan_dev_free(struct net_device *dev) -{ - dev_put(lowpan_dev_info(dev)->real_dev); - free_netdev(dev); -} - -static struct header_ops lowpan_header_ops = { - .create = lowpan_header_create, -}; - -static const struct net_device_ops lowpan_netdev_ops = { - .ndo_start_xmit = lowpan_xmit, - .ndo_set_mac_address = lowpan_set_address, -}; - -static void lowpan_setup(struct net_device *dev) -{ - pr_debug("(%s)\n", __func__); - - dev->addr_len = IEEE802154_ADDR_LEN; - memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN); - dev->type = ARPHRD_IEEE802154; - /* Frame Control + Sequence Number + Address fields + Security Header */ - dev->hard_header_len = 2 + 1 + 20 + 14; - dev->needed_tailroom = 2; /* FCS */ - dev->mtu = 1281; - dev->tx_queue_len = 0; - dev->flags = IFF_BROADCAST | IFF_MULTICAST; - dev->watchdog_timeo = 0; - - dev->netdev_ops = &lowpan_netdev_ops; - dev->header_ops = &lowpan_header_ops; - dev->destructor = lowpan_dev_free; -} - -static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[]) -{ - pr_debug("(%s)\n", __func__); - - if (tb[IFLA_ADDRESS]) { - if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN) - return -EINVAL; - } - return 0; -} - -static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev, - struct packet_type *pt, struct net_device *orig_dev) -{ - if (!netif_running(dev)) - goto drop; - - if (dev->type != ARPHRD_IEEE802154) - goto drop; - - /* check that it's our buffer */ - switch (skb->data[0] & 0xe0) { - case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ - case LOWPAN_DISPATCH_FRAG1: /* first fragment header */ - case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */ - lowpan_process_data(skb); - break; - default: - break; - } - - return NET_RX_SUCCESS; - -drop: - kfree_skb(skb); - return NET_RX_DROP; -} - -static int lowpan_newlink(struct net *src_net, struct net_device *dev, - struct nlattr *tb[], struct nlattr *data[]) -{ - struct net_device *real_dev; - struct lowpan_dev_record *entry; - - pr_debug("(%s)\n", __func__); - - if (!tb[IFLA_LINK]) - return -EINVAL; - /* find and hold real wpan device */ - real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); - if (!real_dev) - return -ENODEV; - - lowpan_dev_info(dev)->real_dev = real_dev; - mutex_init(&lowpan_dev_info(dev)->dev_list_mtx); - - entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL); - if (!entry) { - dev_put(real_dev); - lowpan_dev_info(dev)->real_dev = NULL; - return -ENOMEM; - } - - entry->ldev = dev; - - mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); - INIT_LIST_HEAD(&entry->list); - list_add_tail(&entry->list, &lowpan_devices); - mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); - - register_netdevice(dev); - - return 0; -} - -static void lowpan_dellink(struct net_device *dev, struct list_head *head) -{ - struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev); - struct net_device *real_dev = lowpan_dev->real_dev; - struct lowpan_dev_record *entry; - struct lowpan_dev_record *tmp; - - ASSERT_RTNL(); - - mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); - list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { - if (entry->ldev == dev) { - list_del(&entry->list); - kfree(entry); - } - } - mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); - - mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx); - - unregister_netdevice_queue(dev, head); - - dev_put(real_dev); -} - -static struct rtnl_link_ops lowpan_link_ops __read_mostly = { - .kind = "lowpan", - .priv_size = sizeof(struct lowpan_dev_info), - .setup = lowpan_setup, - .newlink = lowpan_newlink, - .dellink = lowpan_dellink, - .validate = lowpan_validate, -}; - -static inline int __init lowpan_netlink_init(void) -{ - return rtnl_link_register(&lowpan_link_ops); -} - -static inline void __init lowpan_netlink_fini(void) -{ - rtnl_link_unregister(&lowpan_link_ops); -} - -static struct packet_type lowpan_packet_type = { - .type = __constant_htons(ETH_P_IEEE802154), - .func = lowpan_rcv, -}; - -static int __init lowpan_init_module(void) -{ - int err = 0; - - pr_debug("(%s)\n", __func__); - - err = lowpan_netlink_init(); - if (err < 0) - goto out; - - dev_add_pack(&lowpan_packet_type); -out: - return err; -} - -static void __exit lowpan_cleanup_module(void) -{ - pr_debug("(%s)\n", __func__); - - lowpan_netlink_fini(); - - dev_remove_pack(&lowpan_packet_type); -} - -module_init(lowpan_init_module); -module_exit(lowpan_cleanup_module); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_RTNL_LINK("lowpan"); |