| /* |
| * 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 <linux/etherdevice.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_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 wpan_phy *lowpan_get_phy(const struct net_device *dev) |
| { |
| struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; |
| return ieee802154_mlme_ops(real_dev)->get_phy(real_dev); |
| } |
| |
| static u16 lowpan_get_pan_id(const struct net_device *dev) |
| { |
| struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; |
| return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev); |
| } |
| |
| static u16 lowpan_get_short_addr(const struct net_device *dev) |
| { |
| struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; |
| return ieee802154_mlme_ops(real_dev)->get_short_addr(real_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 = eth_mac_addr, |
| }; |
| |
| static struct ieee802154_mlme_ops lowpan_mlme = { |
| .get_pan_id = lowpan_get_pan_id, |
| .get_phy = lowpan_get_phy, |
| .get_short_addr = lowpan_get_short_addr, |
| }; |
| |
| 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->ml_priv = &lowpan_mlme; |
| 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, *tmp; |
| struct lowpan_fragment *frame, *tframe; |
| |
| ASSERT_RTNL(); |
| |
| spin_lock(&flist_lock); |
| list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) { |
| del_timer(&frame->timer); |
| list_del(&frame->list); |
| dev_kfree_skb(frame->skb); |
| kfree(frame); |
| } |
| spin_unlock(&flist_lock); |
| |
| 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"); |