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![Alexander Aring](/assets/img/avatar_default.png)
This patch changes the naming for interface private data for lowpan intefaces. The current private data scheme is: ------------------------------------------------- | 6LoWPAN Generic | LinkLayer 6LoWPAN | ------------------------------------------------- the current naming schemes are: - 6LoWPAN Generic: - lowpan_priv - LinkLayer 6LoWPAN: - BTLE - lowpan_dev - 802.15.4: - lowpan_dev_info the new naming scheme with this patch will be: - 6LoWPAN Generic: - lowpan_dev - LinkLayer 6LoWPAN: - BTLE - lowpan_btle_dev - 802.15.4: - lowpan_802154_dev Signed-off-by: Alexander Aring <aar@pengutronix.de> Reviewed-by: Stefan Schmidt<stefan@osg.samsung.com> Acked-by: Jukka Rissanen <jukka.rissanen@linux.intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
299 lines
8 KiB
C
299 lines
8 KiB
C
/* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <net/6lowpan.h>
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#include <net/ieee802154_netdev.h>
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#include <net/mac802154.h>
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#include "6lowpan_i.h"
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#define LOWPAN_FRAG1_HEAD_SIZE 0x4
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#define LOWPAN_FRAGN_HEAD_SIZE 0x5
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/* don't save pan id, it's intra pan */
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struct lowpan_addr {
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u8 mode;
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union {
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/* IPv6 needs big endian here */
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__be64 extended_addr;
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__be16 short_addr;
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} u;
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};
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struct lowpan_addr_info {
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struct lowpan_addr daddr;
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struct lowpan_addr saddr;
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};
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static inline struct
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lowpan_addr_info *lowpan_skb_priv(const struct sk_buff *skb)
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{
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WARN_ON_ONCE(skb_headroom(skb) < sizeof(struct lowpan_addr_info));
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return (struct lowpan_addr_info *)(skb->data -
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sizeof(struct lowpan_addr_info));
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}
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/* This callback will be called from AF_PACKET and IPv6 stack, the AF_PACKET
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* sockets gives an 8 byte array for addresses only!
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*
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* TODO I think AF_PACKET DGRAM (sending/receiving) RAW (sending) makes no
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* sense here. We should disable it, the right use-case would be AF_INET6
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* RAW/DGRAM sockets.
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*/
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int lowpan_header_create(struct sk_buff *skb, struct net_device *ldev,
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unsigned short type, const void *_daddr,
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const void *_saddr, unsigned int len)
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{
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const u8 *saddr = _saddr;
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const u8 *daddr = _daddr;
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struct lowpan_addr_info *info;
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/* TODO:
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* if this package isn't ipv6 one, where should it be routed?
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*/
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if (type != ETH_P_IPV6)
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return 0;
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if (!saddr)
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saddr = ldev->dev_addr;
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raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
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raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
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info = lowpan_skb_priv(skb);
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/* TODO: Currently we only support extended_addr */
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info->daddr.mode = IEEE802154_ADDR_LONG;
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memcpy(&info->daddr.u.extended_addr, daddr,
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sizeof(info->daddr.u.extended_addr));
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info->saddr.mode = IEEE802154_ADDR_LONG;
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memcpy(&info->saddr.u.extended_addr, saddr,
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sizeof(info->daddr.u.extended_addr));
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return 0;
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}
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static struct sk_buff*
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lowpan_alloc_frag(struct sk_buff *skb, int size,
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const struct ieee802154_hdr *master_hdr, bool frag1)
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{
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struct net_device *wdev = lowpan_802154_dev(skb->dev)->wdev;
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struct sk_buff *frag;
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int rc;
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frag = alloc_skb(wdev->needed_headroom + wdev->needed_tailroom + size,
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GFP_ATOMIC);
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if (likely(frag)) {
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frag->dev = wdev;
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frag->priority = skb->priority;
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skb_reserve(frag, wdev->needed_headroom);
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skb_reset_network_header(frag);
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*mac_cb(frag) = *mac_cb(skb);
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if (frag1) {
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memcpy(skb_put(frag, skb->mac_len),
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skb_mac_header(skb), skb->mac_len);
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} else {
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rc = wpan_dev_hard_header(frag, wdev,
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&master_hdr->dest,
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&master_hdr->source, size);
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if (rc < 0) {
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kfree_skb(frag);
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return ERR_PTR(rc);
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}
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}
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} else {
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frag = ERR_PTR(-ENOMEM);
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}
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return frag;
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}
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static int
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lowpan_xmit_fragment(struct sk_buff *skb, const struct ieee802154_hdr *wpan_hdr,
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u8 *frag_hdr, int frag_hdrlen,
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int offset, int len, bool frag1)
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{
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struct sk_buff *frag;
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raw_dump_inline(__func__, " fragment header", frag_hdr, frag_hdrlen);
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frag = lowpan_alloc_frag(skb, frag_hdrlen + len, wpan_hdr, frag1);
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if (IS_ERR(frag))
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return PTR_ERR(frag);
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memcpy(skb_put(frag, frag_hdrlen), frag_hdr, frag_hdrlen);
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memcpy(skb_put(frag, len), skb_network_header(skb) + offset, len);
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raw_dump_table(__func__, " fragment dump", frag->data, frag->len);
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return dev_queue_xmit(frag);
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}
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static int
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lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *ldev,
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const struct ieee802154_hdr *wpan_hdr, u16 dgram_size,
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u16 dgram_offset)
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{
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__be16 frag_tag;
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u8 frag_hdr[5];
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int frag_cap, frag_len, payload_cap, rc;
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int skb_unprocessed, skb_offset;
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frag_tag = htons(lowpan_802154_dev(ldev)->fragment_tag);
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lowpan_802154_dev(ldev)->fragment_tag++;
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frag_hdr[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x07);
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frag_hdr[1] = dgram_size & 0xff;
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memcpy(frag_hdr + 2, &frag_tag, sizeof(frag_tag));
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payload_cap = ieee802154_max_payload(wpan_hdr);
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frag_len = round_down(payload_cap - LOWPAN_FRAG1_HEAD_SIZE -
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skb_network_header_len(skb), 8);
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skb_offset = skb_network_header_len(skb);
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skb_unprocessed = skb->len - skb->mac_len - skb_offset;
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rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr,
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LOWPAN_FRAG1_HEAD_SIZE, 0,
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frag_len + skb_network_header_len(skb),
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true);
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if (rc) {
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pr_debug("%s unable to send FRAG1 packet (tag: %d)",
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__func__, ntohs(frag_tag));
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goto err;
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}
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frag_hdr[0] &= ~LOWPAN_DISPATCH_FRAG1;
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frag_hdr[0] |= LOWPAN_DISPATCH_FRAGN;
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frag_cap = round_down(payload_cap - LOWPAN_FRAGN_HEAD_SIZE, 8);
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do {
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dgram_offset += frag_len;
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skb_offset += frag_len;
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skb_unprocessed -= frag_len;
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frag_len = min(frag_cap, skb_unprocessed);
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frag_hdr[4] = dgram_offset >> 3;
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rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr,
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LOWPAN_FRAGN_HEAD_SIZE, skb_offset,
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frag_len, false);
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if (rc) {
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pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n",
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__func__, ntohs(frag_tag), skb_offset);
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goto err;
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}
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} while (skb_unprocessed > frag_cap);
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ldev->stats.tx_packets++;
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ldev->stats.tx_bytes += dgram_size;
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consume_skb(skb);
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return NET_XMIT_SUCCESS;
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err:
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kfree_skb(skb);
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return rc;
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}
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static int lowpan_header(struct sk_buff *skb, struct net_device *ldev,
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u16 *dgram_size, u16 *dgram_offset)
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{
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struct wpan_dev *wpan_dev = lowpan_802154_dev(ldev)->wdev->ieee802154_ptr;
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struct ieee802154_addr sa, da;
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struct ieee802154_mac_cb *cb = mac_cb_init(skb);
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struct lowpan_addr_info info;
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void *daddr, *saddr;
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memcpy(&info, lowpan_skb_priv(skb), sizeof(info));
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/* TODO: Currently we only support extended_addr */
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daddr = &info.daddr.u.extended_addr;
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saddr = &info.saddr.u.extended_addr;
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*dgram_size = skb->len;
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lowpan_header_compress(skb, ldev, daddr, saddr);
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/* dgram_offset = (saved bytes after compression) + lowpan header len */
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*dgram_offset = (*dgram_size - skb->len) + skb_network_header_len(skb);
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cb->type = IEEE802154_FC_TYPE_DATA;
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/* prepare wpan address data */
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sa.mode = IEEE802154_ADDR_LONG;
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sa.pan_id = wpan_dev->pan_id;
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sa.extended_addr = ieee802154_devaddr_from_raw(saddr);
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/* intra-PAN communications */
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da.pan_id = sa.pan_id;
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/* if the destination address is the broadcast address, use the
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* corresponding short address
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*/
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if (!memcmp(daddr, ldev->broadcast, EUI64_ADDR_LEN)) {
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da.mode = IEEE802154_ADDR_SHORT;
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da.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
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cb->ackreq = false;
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} else {
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da.mode = IEEE802154_ADDR_LONG;
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da.extended_addr = ieee802154_devaddr_from_raw(daddr);
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cb->ackreq = wpan_dev->ackreq;
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}
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return wpan_dev_hard_header(skb, lowpan_802154_dev(ldev)->wdev, &da,
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&sa, 0);
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}
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netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *ldev)
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{
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struct ieee802154_hdr wpan_hdr;
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int max_single, ret;
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u16 dgram_size, dgram_offset;
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pr_debug("package xmit\n");
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WARN_ON_ONCE(skb->len > IPV6_MIN_MTU);
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/* We must take a copy of the skb before we modify/replace the ipv6
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* header as the header could be used elsewhere
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*/
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skb = skb_unshare(skb, GFP_ATOMIC);
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if (!skb)
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return NET_XMIT_DROP;
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ret = lowpan_header(skb, ldev, &dgram_size, &dgram_offset);
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if (ret < 0) {
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kfree_skb(skb);
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return NET_XMIT_DROP;
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}
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if (ieee802154_hdr_peek(skb, &wpan_hdr) < 0) {
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kfree_skb(skb);
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return NET_XMIT_DROP;
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}
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max_single = ieee802154_max_payload(&wpan_hdr);
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if (skb_tail_pointer(skb) - skb_network_header(skb) <= max_single) {
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skb->dev = lowpan_802154_dev(ldev)->wdev;
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ldev->stats.tx_packets++;
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ldev->stats.tx_bytes += dgram_size;
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return dev_queue_xmit(skb);
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} else {
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netdev_tx_t rc;
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pr_debug("frame is too big, fragmentation is needed\n");
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rc = lowpan_xmit_fragmented(skb, ldev, &wpan_hdr, dgram_size,
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dgram_offset);
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return rc < 0 ? NET_XMIT_DROP : rc;
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}
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}
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