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ieee802154: 6lowpan: move transmit functionality
This patch moves all relevant transmit functionality into a separate tx.c file. We can simple separate this functionality like we did it in mac802154. Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Alexander Aring
Marcel Holtmann
parent
4662a0da54
commit
4dc315e267
@ -3,6 +3,7 @@
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#include <linux/list.h>
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#include <net/ieee802154_netdev.h>
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#include <net/inet_frag.h>
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struct lowpan_create_arg {
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@ -63,4 +64,9 @@ int lowpan_net_frag_init(void);
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void lowpan_rx_init(void);
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void lowpan_rx_exit(void);
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int lowpan_header_create(struct sk_buff *skb, struct net_device *dev,
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unsigned short type, const void *_daddr,
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const void *_saddr, unsigned int len);
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netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev);
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#endif /* __IEEE802154_6LOWPAN_I_H__ */
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@ -44,15 +44,10 @@
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* SUCH DAMAGE.
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*/
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#include <linux/bitops.h>
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#include <linux/if_arp.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/netdevice.h>
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#include <linux/ieee802154.h>
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#include <net/af_ieee802154.h>
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#include <net/ieee802154_netdev.h>
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#include <net/6lowpan.h>
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#include <net/ipv6.h>
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#include "6lowpan_i.h"
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@ -60,263 +55,6 @@
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LIST_HEAD(lowpan_devices);
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static int lowpan_open_count;
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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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static int lowpan_header_create(struct sk_buff *skb, struct net_device *dev,
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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 = dev->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)
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{
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struct net_device *real_dev = lowpan_dev_info(skb->dev)->real_dev;
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struct sk_buff *frag;
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int rc;
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frag = alloc_skb(real_dev->hard_header_len +
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real_dev->needed_tailroom + size,
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GFP_ATOMIC);
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if (likely(frag)) {
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frag->dev = real_dev;
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frag->priority = skb->priority;
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skb_reserve(frag, real_dev->hard_header_len);
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skb_reset_network_header(frag);
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*mac_cb(frag) = *mac_cb(skb);
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rc = dev_hard_header(frag, real_dev, 0, &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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} 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)
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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);
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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 *dev,
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const struct ieee802154_hdr *wpan_hdr)
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{
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u16 dgram_size, dgram_offset;
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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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dgram_size = lowpan_uncompress_size(skb, &dgram_offset) -
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skb->mac_len;
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frag_tag = htons(lowpan_dev_info(dev)->fragment_tag);
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lowpan_dev_info(dev)->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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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);
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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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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 *dev)
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{
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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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lowpan_header_compress(skb, dev, ETH_P_IPV6, daddr, saddr, skb->len);
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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 = ieee802154_mlme_ops(dev)->get_pan_id(dev);
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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 (lowpan_is_addr_broadcast((const u8 *)daddr)) {
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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 = true;
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}
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return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
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ETH_P_IPV6, (void *)&da, (void *)&sa, 0);
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}
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static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
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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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pr_debug("package xmit\n");
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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, dev);
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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_dev_info(dev)->real_dev;
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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, dev, &wpan_hdr);
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return rc < 0 ? NET_XMIT_DROP : rc;
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}
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}
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static __le16 lowpan_get_pan_id(const struct net_device *dev)
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{
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struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
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@ -1,3 +1,3 @@
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obj-y += ieee802154_6lowpan.o
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ieee802154_6lowpan-y := 6lowpan_rtnl.o rx.o reassembly.o
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ieee802154_6lowpan-y := 6lowpan_rtnl.o rx.o reassembly.o tx.o
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271
net/ieee802154/6lowpan/tx.c
Normal file
271
net/ieee802154/6lowpan/tx.c
Normal file
@ -0,0 +1,271 @@
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/* 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 "6lowpan_i.h"
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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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int lowpan_header_create(struct sk_buff *skb, struct net_device *dev,
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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 = dev->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)
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{
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struct net_device *real_dev = lowpan_dev_info(skb->dev)->real_dev;
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struct sk_buff *frag;
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int rc;
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frag = alloc_skb(real_dev->hard_header_len +
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real_dev->needed_tailroom + size,
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GFP_ATOMIC);
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if (likely(frag)) {
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frag->dev = real_dev;
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frag->priority = skb->priority;
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skb_reserve(frag, real_dev->hard_header_len);
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skb_reset_network_header(frag);
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*mac_cb(frag) = *mac_cb(skb);
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rc = dev_hard_header(frag, real_dev, 0, &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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} 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)
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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);
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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 *dev,
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const struct ieee802154_hdr *wpan_hdr)
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{
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u16 dgram_size, dgram_offset;
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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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dgram_size = lowpan_uncompress_size(skb, &dgram_offset) -
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skb->mac_len;
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frag_tag = htons(lowpan_dev_info(dev)->fragment_tag);
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lowpan_dev_info(dev)->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);
|
||||
skb_unprocessed = skb->len - skb->mac_len - skb_offset;
|
||||
|
||||
rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr,
|
||||
LOWPAN_FRAG1_HEAD_SIZE, 0,
|
||||
frag_len + skb_network_header_len(skb));
|
||||
if (rc) {
|
||||
pr_debug("%s unable to send FRAG1 packet (tag: %d)",
|
||||
__func__, ntohs(frag_tag));
|
||||
goto err;
|
||||
}
|
||||
|
||||
frag_hdr[0] &= ~LOWPAN_DISPATCH_FRAG1;
|
||||
frag_hdr[0] |= LOWPAN_DISPATCH_FRAGN;
|
||||
frag_cap = round_down(payload_cap - LOWPAN_FRAGN_HEAD_SIZE, 8);
|
||||
|
||||
do {
|
||||
dgram_offset += frag_len;
|
||||
skb_offset += frag_len;
|
||||
skb_unprocessed -= frag_len;
|
||||
frag_len = min(frag_cap, skb_unprocessed);
|
||||
|
||||
frag_hdr[4] = dgram_offset >> 3;
|
||||
|
||||
rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr,
|
||||
LOWPAN_FRAGN_HEAD_SIZE, skb_offset,
|
||||
frag_len);
|
||||
if (rc) {
|
||||
pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n",
|
||||
__func__, ntohs(frag_tag), skb_offset);
|
||||
goto err;
|
||||
}
|
||||
} while (skb_unprocessed > frag_cap);
|
||||
|
||||
consume_skb(skb);
|
||||
return NET_XMIT_SUCCESS;
|
||||
|
||||
err:
|
||||
kfree_skb(skb);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int lowpan_header(struct sk_buff *skb, struct net_device *dev)
|
||||
{
|
||||
struct ieee802154_addr sa, da;
|
||||
struct ieee802154_mac_cb *cb = mac_cb_init(skb);
|
||||
struct lowpan_addr_info info;
|
||||
void *daddr, *saddr;
|
||||
|
||||
memcpy(&info, lowpan_skb_priv(skb), sizeof(info));
|
||||
|
||||
/* TODO: Currently we only support extended_addr */
|
||||
daddr = &info.daddr.u.extended_addr;
|
||||
saddr = &info.saddr.u.extended_addr;
|
||||
|
||||
lowpan_header_compress(skb, dev, ETH_P_IPV6, daddr, saddr, skb->len);
|
||||
|
||||
cb->type = IEEE802154_FC_TYPE_DATA;
|
||||
|
||||
/* prepare wpan address data */
|
||||
sa.mode = IEEE802154_ADDR_LONG;
|
||||
sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
|
||||
sa.extended_addr = ieee802154_devaddr_from_raw(saddr);
|
||||
|
||||
/* intra-PAN communications */
|
||||
da.pan_id = sa.pan_id;
|
||||
|
||||
/* if the destination address is the broadcast address, use the
|
||||
* corresponding short address
|
||||
*/
|
||||
if (lowpan_is_addr_broadcast((const u8 *)daddr)) {
|
||||
da.mode = IEEE802154_ADDR_SHORT;
|
||||
da.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
|
||||
cb->ackreq = false;
|
||||
} else {
|
||||
da.mode = IEEE802154_ADDR_LONG;
|
||||
da.extended_addr = ieee802154_devaddr_from_raw(daddr);
|
||||
cb->ackreq = true;
|
||||
}
|
||||
|
||||
return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
|
||||
ETH_P_IPV6, (void *)&da, (void *)&sa, 0);
|
||||
}
|
||||
|
||||
netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
|
||||
{
|
||||
struct ieee802154_hdr wpan_hdr;
|
||||
int max_single, ret;
|
||||
|
||||
pr_debug("package xmit\n");
|
||||
|
||||
/* We must take a copy of the skb before we modify/replace the ipv6
|
||||
* header as the header could be used elsewhere
|
||||
*/
|
||||
skb = skb_unshare(skb, GFP_ATOMIC);
|
||||
if (!skb)
|
||||
return NET_XMIT_DROP;
|
||||
|
||||
ret = lowpan_header(skb, dev);
|
||||
if (ret < 0) {
|
||||
kfree_skb(skb);
|
||||
return NET_XMIT_DROP;
|
||||
}
|
||||
|
||||
if (ieee802154_hdr_peek(skb, &wpan_hdr) < 0) {
|
||||
kfree_skb(skb);
|
||||
return NET_XMIT_DROP;
|
||||
}
|
||||
|
||||
max_single = ieee802154_max_payload(&wpan_hdr);
|
||||
|
||||
if (skb_tail_pointer(skb) - skb_network_header(skb) <= max_single) {
|
||||
skb->dev = lowpan_dev_info(dev)->real_dev;
|
||||
return dev_queue_xmit(skb);
|
||||
} else {
|
||||
netdev_tx_t rc;
|
||||
|
||||
pr_debug("frame is too big, fragmentation is needed\n");
|
||||
rc = lowpan_xmit_fragmented(skb, dev, &wpan_hdr);
|
||||
|
||||
return rc < 0 ? NET_XMIT_DROP : rc;
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user