From 4dc315e267fe4a3c863fec21f26aa0a418c3f07a Mon Sep 17 00:00:00 2001 From: Alexander Aring Date: Sun, 4 Jan 2015 17:10:56 +0100 Subject: [PATCH] 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 Signed-off-by: Marcel Holtmann --- net/ieee802154/6lowpan/6lowpan_i.h | 6 + net/ieee802154/6lowpan/6lowpan_rtnl.c | 264 +-------------------------------- net/ieee802154/6lowpan/Makefile | 2 +- net/ieee802154/6lowpan/tx.c | 271 ++++++++++++++++++++++++++++++++++ 4 files changed, 279 insertions(+), 264 deletions(-) create mode 100644 net/ieee802154/6lowpan/tx.c diff --git a/net/ieee802154/6lowpan/6lowpan_i.h b/net/ieee802154/6lowpan/6lowpan_i.h index 29ec61b..e50f69d 100644 --- a/net/ieee802154/6lowpan/6lowpan_i.h +++ b/net/ieee802154/6lowpan/6lowpan_i.h @@ -3,6 +3,7 @@ #include +#include #include struct lowpan_create_arg { @@ -63,4 +64,9 @@ int lowpan_net_frag_init(void); void lowpan_rx_init(void); void lowpan_rx_exit(void); +int lowpan_header_create(struct sk_buff *skb, struct net_device *dev, + unsigned short type, const void *_daddr, + const void *_saddr, unsigned int len); +netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev); + #endif /* __IEEE802154_6LOWPAN_I_H__ */ diff --git a/net/ieee802154/6lowpan/6lowpan_rtnl.c b/net/ieee802154/6lowpan/6lowpan_rtnl.c index 9dce20e..055fbb7 100644 --- a/net/ieee802154/6lowpan/6lowpan_rtnl.c +++ b/net/ieee802154/6lowpan/6lowpan_rtnl.c @@ -44,15 +44,10 @@ * SUCH DAMAGE. */ -#include -#include #include -#include #include #include -#include -#include -#include + #include #include "6lowpan_i.h" @@ -60,263 +55,6 @@ LIST_HEAD(lowpan_devices); static int lowpan_open_count; -/* don't save pan id, it's intra pan */ -struct lowpan_addr { - u8 mode; - union { - /* IPv6 needs big endian here */ - __be64 extended_addr; - __be16 short_addr; - } u; -}; - -struct lowpan_addr_info { - struct lowpan_addr daddr; - struct lowpan_addr saddr; -}; - -static inline struct -lowpan_addr_info *lowpan_skb_priv(const struct sk_buff *skb) -{ - WARN_ON_ONCE(skb_headroom(skb) < sizeof(struct lowpan_addr_info)); - return (struct lowpan_addr_info *)(skb->data - - sizeof(struct lowpan_addr_info)); -} - -static int lowpan_header_create(struct sk_buff *skb, struct net_device *dev, - unsigned short type, const void *_daddr, - const void *_saddr, unsigned int len) -{ - const u8 *saddr = _saddr; - const u8 *daddr = _daddr; - struct lowpan_addr_info *info; - - /* TODO: - * if this package isn't ipv6 one, where should it be routed? - */ - if (type != ETH_P_IPV6) - return 0; - - if (!saddr) - saddr = dev->dev_addr; - - raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); - raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); - - info = lowpan_skb_priv(skb); - - /* TODO: Currently we only support extended_addr */ - info->daddr.mode = IEEE802154_ADDR_LONG; - memcpy(&info->daddr.u.extended_addr, daddr, - sizeof(info->daddr.u.extended_addr)); - info->saddr.mode = IEEE802154_ADDR_LONG; - memcpy(&info->saddr.u.extended_addr, saddr, - sizeof(info->daddr.u.extended_addr)); - - return 0; -} - -static struct sk_buff* -lowpan_alloc_frag(struct sk_buff *skb, int size, - const struct ieee802154_hdr *master_hdr) -{ - struct net_device *real_dev = lowpan_dev_info(skb->dev)->real_dev; - struct sk_buff *frag; - int rc; - - frag = alloc_skb(real_dev->hard_header_len + - real_dev->needed_tailroom + size, - GFP_ATOMIC); - - if (likely(frag)) { - frag->dev = real_dev; - frag->priority = skb->priority; - skb_reserve(frag, real_dev->hard_header_len); - skb_reset_network_header(frag); - *mac_cb(frag) = *mac_cb(skb); - - rc = dev_hard_header(frag, real_dev, 0, &master_hdr->dest, - &master_hdr->source, size); - if (rc < 0) { - kfree_skb(frag); - return ERR_PTR(rc); - } - } else { - frag = ERR_PTR(-ENOMEM); - } - - return frag; -} - -static int -lowpan_xmit_fragment(struct sk_buff *skb, const struct ieee802154_hdr *wpan_hdr, - u8 *frag_hdr, int frag_hdrlen, - int offset, int len) -{ - struct sk_buff *frag; - - raw_dump_inline(__func__, " fragment header", frag_hdr, frag_hdrlen); - - frag = lowpan_alloc_frag(skb, frag_hdrlen + len, wpan_hdr); - if (IS_ERR(frag)) - return -PTR_ERR(frag); - - memcpy(skb_put(frag, frag_hdrlen), frag_hdr, frag_hdrlen); - memcpy(skb_put(frag, len), skb_network_header(skb) + offset, len); - - raw_dump_table(__func__, " fragment dump", frag->data, frag->len); - - return dev_queue_xmit(frag); -} - -static int -lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *dev, - const struct ieee802154_hdr *wpan_hdr) -{ - u16 dgram_size, dgram_offset; - __be16 frag_tag; - u8 frag_hdr[5]; - int frag_cap, frag_len, payload_cap, rc; - int skb_unprocessed, skb_offset; - - dgram_size = lowpan_uncompress_size(skb, &dgram_offset) - - skb->mac_len; - frag_tag = htons(lowpan_dev_info(dev)->fragment_tag); - lowpan_dev_info(dev)->fragment_tag++; - - frag_hdr[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x07); - frag_hdr[1] = dgram_size & 0xff; - memcpy(frag_hdr + 2, &frag_tag, sizeof(frag_tag)); - - payload_cap = ieee802154_max_payload(wpan_hdr); - - frag_len = round_down(payload_cap - LOWPAN_FRAG1_HEAD_SIZE - - skb_network_header_len(skb), 8); - - 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); -} - -static 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; - } -} - static __le16 lowpan_get_pan_id(const struct net_device *dev) { struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; diff --git a/net/ieee802154/6lowpan/Makefile b/net/ieee802154/6lowpan/Makefile index 8e83971..7f11c13 100644 --- a/net/ieee802154/6lowpan/Makefile +++ b/net/ieee802154/6lowpan/Makefile @@ -1,3 +1,3 @@ obj-y += ieee802154_6lowpan.o -ieee802154_6lowpan-y := 6lowpan_rtnl.o rx.o reassembly.o +ieee802154_6lowpan-y := 6lowpan_rtnl.o rx.o reassembly.o tx.o diff --git a/net/ieee802154/6lowpan/tx.c b/net/ieee802154/6lowpan/tx.c new file mode 100644 index 0000000..2349070 --- /dev/null +++ b/net/ieee802154/6lowpan/tx.c @@ -0,0 +1,271 @@ +/* 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 +#include + +#include "6lowpan_i.h" + +/* don't save pan id, it's intra pan */ +struct lowpan_addr { + u8 mode; + union { + /* IPv6 needs big endian here */ + __be64 extended_addr; + __be16 short_addr; + } u; +}; + +struct lowpan_addr_info { + struct lowpan_addr daddr; + struct lowpan_addr saddr; +}; + +static inline struct +lowpan_addr_info *lowpan_skb_priv(const struct sk_buff *skb) +{ + WARN_ON_ONCE(skb_headroom(skb) < sizeof(struct lowpan_addr_info)); + return (struct lowpan_addr_info *)(skb->data - + sizeof(struct lowpan_addr_info)); +} + +int lowpan_header_create(struct sk_buff *skb, struct net_device *dev, + unsigned short type, const void *_daddr, + const void *_saddr, unsigned int len) +{ + const u8 *saddr = _saddr; + const u8 *daddr = _daddr; + struct lowpan_addr_info *info; + + /* TODO: + * if this package isn't ipv6 one, where should it be routed? + */ + if (type != ETH_P_IPV6) + return 0; + + if (!saddr) + saddr = dev->dev_addr; + + raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); + raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); + + info = lowpan_skb_priv(skb); + + /* TODO: Currently we only support extended_addr */ + info->daddr.mode = IEEE802154_ADDR_LONG; + memcpy(&info->daddr.u.extended_addr, daddr, + sizeof(info->daddr.u.extended_addr)); + info->saddr.mode = IEEE802154_ADDR_LONG; + memcpy(&info->saddr.u.extended_addr, saddr, + sizeof(info->daddr.u.extended_addr)); + + return 0; +} + +static struct sk_buff* +lowpan_alloc_frag(struct sk_buff *skb, int size, + const struct ieee802154_hdr *master_hdr) +{ + struct net_device *real_dev = lowpan_dev_info(skb->dev)->real_dev; + struct sk_buff *frag; + int rc; + + frag = alloc_skb(real_dev->hard_header_len + + real_dev->needed_tailroom + size, + GFP_ATOMIC); + + if (likely(frag)) { + frag->dev = real_dev; + frag->priority = skb->priority; + skb_reserve(frag, real_dev->hard_header_len); + skb_reset_network_header(frag); + *mac_cb(frag) = *mac_cb(skb); + + rc = dev_hard_header(frag, real_dev, 0, &master_hdr->dest, + &master_hdr->source, size); + if (rc < 0) { + kfree_skb(frag); + return ERR_PTR(rc); + } + } else { + frag = ERR_PTR(-ENOMEM); + } + + return frag; +} + +static int +lowpan_xmit_fragment(struct sk_buff *skb, const struct ieee802154_hdr *wpan_hdr, + u8 *frag_hdr, int frag_hdrlen, + int offset, int len) +{ + struct sk_buff *frag; + + raw_dump_inline(__func__, " fragment header", frag_hdr, frag_hdrlen); + + frag = lowpan_alloc_frag(skb, frag_hdrlen + len, wpan_hdr); + if (IS_ERR(frag)) + return -PTR_ERR(frag); + + memcpy(skb_put(frag, frag_hdrlen), frag_hdr, frag_hdrlen); + memcpy(skb_put(frag, len), skb_network_header(skb) + offset, len); + + raw_dump_table(__func__, " fragment dump", frag->data, frag->len); + + return dev_queue_xmit(frag); +} + +static int +lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *dev, + const struct ieee802154_hdr *wpan_hdr) +{ + u16 dgram_size, dgram_offset; + __be16 frag_tag; + u8 frag_hdr[5]; + int frag_cap, frag_len, payload_cap, rc; + int skb_unprocessed, skb_offset; + + dgram_size = lowpan_uncompress_size(skb, &dgram_offset) - + skb->mac_len; + frag_tag = htons(lowpan_dev_info(dev)->fragment_tag); + lowpan_dev_info(dev)->fragment_tag++; + + frag_hdr[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x07); + frag_hdr[1] = dgram_size & 0xff; + memcpy(frag_hdr + 2, &frag_tag, sizeof(frag_tag)); + + payload_cap = ieee802154_max_payload(wpan_hdr); + + frag_len = round_down(payload_cap - LOWPAN_FRAG1_HEAD_SIZE - + skb_network_header_len(skb), 8); + + 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; + } +} -- 2.7.4