diff options
Diffstat (limited to 'net/ieee802154/6lowpan/rx.c')
| -rw-r--r-- | net/ieee802154/6lowpan/rx.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/net/ieee802154/6lowpan/rx.c b/net/ieee802154/6lowpan/rx.c new file mode 100644 index 000000000000..4be1d289ab2d --- /dev/null +++ b/net/ieee802154/6lowpan/rx.c @@ -0,0 +1,171 @@ +/* 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. + */ + +#include <linux/if_arp.h> + +#include <net/6lowpan.h> +#include <net/ieee802154_netdev.h> + +#include "6lowpan_i.h" + +static int lowpan_give_skb_to_devices(struct sk_buff *skb, + struct net_device *dev) +{ + struct lowpan_dev_record *entry; + struct sk_buff *skb_cp; + int stat = NET_RX_SUCCESS; + + skb->protocol = htons(ETH_P_IPV6); + skb->pkt_type = PACKET_HOST; + + rcu_read_lock(); + list_for_each_entry_rcu(entry, &lowpan_devices, list) + if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) { + skb_cp = skb_copy(skb, GFP_ATOMIC); + if (!skb_cp) { + kfree_skb(skb); + rcu_read_unlock(); + return NET_RX_DROP; + } + + skb_cp->dev = entry->ldev; + stat = netif_rx(skb_cp); + if (stat == NET_RX_DROP) + break; + } + rcu_read_unlock(); + + consume_skb(skb); + + return stat; +} + +static int +iphc_decompress(struct sk_buff *skb, const struct ieee802154_hdr *hdr) +{ + u8 iphc0, iphc1; + struct ieee802154_addr_sa sa, da; + void *sap, *dap; + + 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) + return -EINVAL; + + if (lowpan_fetch_skb_u8(skb, &iphc0)) + return -EINVAL; + + if (lowpan_fetch_skb_u8(skb, &iphc1)) + return -EINVAL; + + ieee802154_addr_to_sa(&sa, &hdr->source); + ieee802154_addr_to_sa(&da, &hdr->dest); + + if (sa.addr_type == IEEE802154_ADDR_SHORT) + sap = &sa.short_addr; + else + sap = &sa.hwaddr; + + if (da.addr_type == IEEE802154_ADDR_SHORT) + dap = &da.short_addr; + else + dap = &da.hwaddr; + + return lowpan_header_decompress(skb, skb->dev, sap, sa.addr_type, + IEEE802154_ADDR_LEN, dap, da.addr_type, + IEEE802154_ADDR_LEN, iphc0, iphc1); +} + +static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev, + struct packet_type *pt, struct net_device *orig_dev) +{ + struct ieee802154_hdr hdr; + int ret; + + skb = skb_share_check(skb, GFP_ATOMIC); + if (!skb) + goto drop; + + if (!netif_running(dev)) + goto drop_skb; + + if (skb->pkt_type == PACKET_OTHERHOST) + goto drop_skb; + + if (dev->type != ARPHRD_IEEE802154) + goto drop_skb; + + if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) + goto drop_skb; + + /* check that it's our buffer */ + if (skb->data[0] == LOWPAN_DISPATCH_IPV6) { + /* Pull off the 1-byte of 6lowpan header. */ + skb_pull(skb, 1); + return lowpan_give_skb_to_devices(skb, NULL); + } else { + switch (skb->data[0] & 0xe0) { + case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ + ret = iphc_decompress(skb, &hdr); + if (ret < 0) + goto drop_skb; + + return lowpan_give_skb_to_devices(skb, NULL); + case LOWPAN_DISPATCH_FRAG1: /* first fragment header */ + ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAG1); + if (ret == 1) { + ret = iphc_decompress(skb, &hdr); + if (ret < 0) + goto drop_skb; + + return lowpan_give_skb_to_devices(skb, NULL); + } else if (ret == -1) { + return NET_RX_DROP; + } else { + return NET_RX_SUCCESS; + } + case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */ + ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAGN); + if (ret == 1) { + ret = iphc_decompress(skb, &hdr); + if (ret < 0) + goto drop_skb; + + return lowpan_give_skb_to_devices(skb, NULL); + } else if (ret == -1) { + return NET_RX_DROP; + } else { + return NET_RX_SUCCESS; + } + default: + break; + } + } + +drop_skb: + kfree_skb(skb); +drop: + return NET_RX_DROP; +} + +static struct packet_type lowpan_packet_type = { + .type = htons(ETH_P_IEEE802154), + .func = lowpan_rcv, +}; + +void lowpan_rx_init(void) +{ + dev_add_pack(&lowpan_packet_type); +} + +void lowpan_rx_exit(void) +{ + dev_remove_pack(&lowpan_packet_type); +} |