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309 lines
8.2 KiB
309 lines
8.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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#include <net/6lowpan.h> |
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#include <net/ndisc.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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struct lowpan_addr_info { |
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struct ieee802154_addr daddr; |
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struct ieee802154_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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struct wpan_dev *wpan_dev = lowpan_802154_dev(ldev)->wdev->ieee802154_ptr; |
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struct lowpan_addr_info *info = lowpan_skb_priv(skb); |
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struct lowpan_802154_neigh *llneigh = NULL; |
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const struct ipv6hdr *hdr = ipv6_hdr(skb); |
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struct neighbour *n; |
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if (!daddr) |
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return -EINVAL; |
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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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/* intra-pan communication */ |
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info->saddr.pan_id = wpan_dev->pan_id; |
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info->daddr.pan_id = info->saddr.pan_id; |
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if (!memcmp(daddr, ldev->broadcast, EUI64_ADDR_LEN)) { |
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info->daddr.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST); |
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info->daddr.mode = IEEE802154_ADDR_SHORT; |
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} else { |
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__le16 short_addr = cpu_to_le16(IEEE802154_ADDR_SHORT_UNSPEC); |
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n = neigh_lookup(&nd_tbl, &hdr->daddr, ldev); |
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if (n) { |
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llneigh = lowpan_802154_neigh(neighbour_priv(n)); |
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read_lock_bh(&n->lock); |
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short_addr = llneigh->short_addr; |
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read_unlock_bh(&n->lock); |
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} |
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if (llneigh && |
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lowpan_802154_is_valid_src_short_addr(short_addr)) { |
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info->daddr.short_addr = short_addr; |
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info->daddr.mode = IEEE802154_ADDR_SHORT; |
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} else { |
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info->daddr.mode = IEEE802154_ADDR_LONG; |
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ieee802154_be64_to_le64(&info->daddr.extended_addr, |
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daddr); |
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} |
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if (n) |
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neigh_release(n); |
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} |
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if (!saddr) { |
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if (lowpan_802154_is_valid_src_short_addr(wpan_dev->short_addr)) { |
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info->saddr.mode = IEEE802154_ADDR_SHORT; |
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info->saddr.short_addr = wpan_dev->short_addr; |
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} else { |
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info->saddr.mode = IEEE802154_ADDR_LONG; |
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info->saddr.extended_addr = wpan_dev->extended_addr; |
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} |
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} else { |
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info->saddr.mode = IEEE802154_ADDR_LONG; |
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ieee802154_be64_to_le64(&info->saddr.extended_addr, saddr); |
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} |
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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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skb_put_data(frag, 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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skb_put_data(frag, frag_hdr, frag_hdrlen); |
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skb_put_data(frag, 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_mac_cb *cb = mac_cb_init(skb); |
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struct lowpan_addr_info info; |
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memcpy(&info, lowpan_skb_priv(skb), sizeof(info)); |
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*dgram_size = skb->len; |
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lowpan_header_compress(skb, ldev, &info.daddr, &info.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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if (info.daddr.mode == IEEE802154_ADDR_SHORT && |
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ieee802154_is_broadcast_short_addr(info.daddr.short_addr)) |
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cb->ackreq = false; |
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else |
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cb->ackreq = wpan_dev->ackreq; |
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return wpan_dev_hard_header(skb, lowpan_802154_dev(ldev)->wdev, |
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&info.daddr, &info.saddr, 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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if (unlikely(skb_headroom(skb) < ldev->needed_headroom || |
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skb_tailroom(skb) < ldev->needed_tailroom)) { |
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struct sk_buff *nskb; |
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nskb = skb_copy_expand(skb, ldev->needed_headroom, |
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ldev->needed_tailroom, GFP_ATOMIC); |
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if (likely(nskb)) { |
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consume_skb(skb); |
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skb = nskb; |
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} else { |
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kfree_skb(skb); |
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return NET_XMIT_DROP; |
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} |
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} else { |
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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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} |
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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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