ieee820154: 6lowpan: dispatch evaluation rework
This patch complete reworks the evaluation of 6lowpan dispatch value by introducing a receive handler mechanism for each dispatch value. A list of changes: - Doing uncompression on-the-fly when FRAG1 is received, this require some special handling for 802.15.4 lltype in generic 6lowpan branch for setting the payload length correct. - Fix dispatch mask for fragmentation. - Add IPv6 dispatch evaluation for FRAG1. - Add skb_unshare for dispatch which might manipulate the skb data buffer. Cc: Jukka Rissanen <jukka.rissanen@linux.intel.com> Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com> 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
f801cf4024
commit
72a5e6bb51
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@ -126,13 +126,19 @@
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(((a)[6]) == 0xFF) && \
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(((a)[7]) == 0xFF))
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#define LOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */
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#define LOWPAN_DISPATCH_HC1 0x42 /* 01000010 = 66 */
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#define LOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */
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#define LOWPAN_DISPATCH_FRAG1 0xc0 /* 11000xxx */
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#define LOWPAN_DISPATCH_FRAGN 0xe0 /* 11100xxx */
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#define LOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */
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#define LOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */
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#define LOWPAN_DISPATCH_IPHC_MASK 0xe0
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#define LOWPAN_DISPATCH_MASK 0xf8 /* 11111000 */
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static inline bool lowpan_is_ipv6(u8 dispatch)
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{
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return dispatch == LOWPAN_DISPATCH_IPV6;
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}
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static inline bool lowpan_is_iphc(u8 dispatch)
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{
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return (dispatch & LOWPAN_DISPATCH_IPHC_MASK) == LOWPAN_DISPATCH_IPHC;
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}
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#define LOWPAN_FRAG_TIMEOUT (HZ * 60) /* time-out 60 sec */
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@ -218,6 +224,19 @@ struct lowpan_priv *lowpan_priv(const struct net_device *dev)
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return netdev_priv(dev);
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}
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struct lowpan_802154_cb {
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u16 d_tag;
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unsigned int d_size;
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u8 d_offset;
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};
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static inline
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struct lowpan_802154_cb *lowpan_802154_cb(const struct sk_buff *skb)
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{
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BUILD_BUG_ON(sizeof(struct lowpan_802154_cb) > sizeof(skb->cb));
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return (struct lowpan_802154_cb *)skb->cb;
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}
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#ifdef DEBUG
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/* print data in line */
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static inline void raw_dump_inline(const char *caller, char *msg,
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@ -366,7 +366,18 @@ lowpan_header_decompress(struct sk_buff *skb, struct net_device *dev,
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return err;
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}
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hdr.payload_len = htons(skb->len);
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switch (lowpan_priv(dev)->lltype) {
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case LOWPAN_LLTYPE_IEEE802154:
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if (lowpan_802154_cb(skb)->d_size)
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hdr.payload_len = htons(lowpan_802154_cb(skb)->d_size -
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sizeof(struct ipv6hdr));
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else
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hdr.payload_len = htons(skb->len);
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break;
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default:
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hdr.payload_len = htons(skb->len);
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break;
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}
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pr_debug("skb headroom size = %d, data length = %d\n",
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skb_headroom(skb), skb->len);
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@ -71,7 +71,18 @@ static int udp_uncompress(struct sk_buff *skb, size_t needed)
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* here, we obtain the hint from the remaining size of the
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* frame
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*/
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uh.len = htons(skb->len + sizeof(struct udphdr));
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switch (lowpan_priv(skb->dev)->lltype) {
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case LOWPAN_LLTYPE_IEEE802154:
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if (lowpan_802154_cb(skb)->d_size)
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uh.len = htons(lowpan_802154_cb(skb)->d_size -
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sizeof(struct ipv6hdr));
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else
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uh.len = htons(skb->len + sizeof(struct udphdr));
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break;
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default:
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uh.len = htons(skb->len + sizeof(struct udphdr));
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break;
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}
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pr_debug("uncompressed UDP length: src = %d", ntohs(uh.len));
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/* replace the compressed UDP head by the uncompressed UDP
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@ -7,6 +7,15 @@
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#include <net/inet_frag.h>
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#include <net/6lowpan.h>
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typedef unsigned __bitwise__ lowpan_rx_result;
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#define RX_CONTINUE ((__force lowpan_rx_result) 0u)
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#define RX_DROP_UNUSABLE ((__force lowpan_rx_result) 1u)
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#define RX_DROP ((__force lowpan_rx_result) 2u)
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#define RX_QUEUED ((__force lowpan_rx_result) 3u)
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#define LOWPAN_DISPATCH_FRAG1 0xc0
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#define LOWPAN_DISPATCH_FRAGN 0xe0
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struct lowpan_create_arg {
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u16 tag;
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u16 d_size;
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@ -62,4 +71,7 @@ int lowpan_header_create(struct sk_buff *skb, struct net_device *dev,
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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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int lowpan_iphc_decompress(struct sk_buff *skb);
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lowpan_rx_result lowpan_rx_h_ipv6(struct sk_buff *skb);
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#endif /* __IEEE802154_6LOWPAN_I_H__ */
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@ -32,17 +32,6 @@
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static const char lowpan_frags_cache_name[] = "lowpan-frags";
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struct lowpan_frag_info {
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u16 d_tag;
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u16 d_size;
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u8 d_offset;
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};
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static struct lowpan_frag_info *lowpan_cb(struct sk_buff *skb)
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{
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return (struct lowpan_frag_info *)skb->cb;
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}
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static struct inet_frags lowpan_frags;
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static int lowpan_frag_reasm(struct lowpan_frag_queue *fq,
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@ -111,7 +100,7 @@ out:
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}
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static inline struct lowpan_frag_queue *
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fq_find(struct net *net, const struct lowpan_frag_info *frag_info,
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fq_find(struct net *net, const struct lowpan_802154_cb *cb,
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const struct ieee802154_addr *src,
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const struct ieee802154_addr *dst)
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{
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@ -121,12 +110,12 @@ fq_find(struct net *net, const struct lowpan_frag_info *frag_info,
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struct netns_ieee802154_lowpan *ieee802154_lowpan =
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net_ieee802154_lowpan(net);
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arg.tag = frag_info->d_tag;
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arg.d_size = frag_info->d_size;
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arg.tag = cb->d_tag;
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arg.d_size = cb->d_size;
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arg.src = src;
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arg.dst = dst;
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hash = lowpan_hash_frag(frag_info->d_tag, frag_info->d_size, src, dst);
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hash = lowpan_hash_frag(cb->d_tag, cb->d_size, src, dst);
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q = inet_frag_find(&ieee802154_lowpan->frags,
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&lowpan_frags, &arg, hash);
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@ -138,7 +127,7 @@ fq_find(struct net *net, const struct lowpan_frag_info *frag_info,
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}
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static int lowpan_frag_queue(struct lowpan_frag_queue *fq,
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struct sk_buff *skb, const u8 frag_type)
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struct sk_buff *skb, u8 frag_type)
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{
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struct sk_buff *prev, *next;
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struct net_device *ldev;
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@ -147,8 +136,8 @@ static int lowpan_frag_queue(struct lowpan_frag_queue *fq,
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if (fq->q.flags & INET_FRAG_COMPLETE)
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goto err;
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offset = lowpan_cb(skb)->d_offset << 3;
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end = lowpan_cb(skb)->d_size;
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offset = lowpan_802154_cb(skb)->d_offset << 3;
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end = lowpan_802154_cb(skb)->d_size;
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/* Is this the final fragment? */
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if (offset + skb->len == end) {
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@ -174,13 +163,16 @@ static int lowpan_frag_queue(struct lowpan_frag_queue *fq,
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* this fragment, right?
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*/
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prev = fq->q.fragments_tail;
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if (!prev || lowpan_cb(prev)->d_offset < lowpan_cb(skb)->d_offset) {
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if (!prev ||
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lowpan_802154_cb(prev)->d_offset <
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lowpan_802154_cb(skb)->d_offset) {
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next = NULL;
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goto found;
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}
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prev = NULL;
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for (next = fq->q.fragments; next != NULL; next = next->next) {
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if (lowpan_cb(next)->d_offset >= lowpan_cb(skb)->d_offset)
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if (lowpan_802154_cb(next)->d_offset >=
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lowpan_802154_cb(skb)->d_offset)
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break; /* bingo! */
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prev = next;
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}
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@ -200,13 +192,10 @@ found:
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skb->dev = NULL;
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fq->q.stamp = skb->tstamp;
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if (frag_type == LOWPAN_DISPATCH_FRAG1) {
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/* Calculate uncomp. 6lowpan header to estimate full size */
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fq->q.meat += lowpan_uncompress_size(skb, NULL);
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if (frag_type == LOWPAN_DISPATCH_FRAG1)
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fq->q.flags |= INET_FRAG_FIRST_IN;
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} else {
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fq->q.meat += skb->len;
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}
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fq->q.meat += skb->len;
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add_frag_mem_limit(fq->q.net, skb->truesize);
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if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
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@ -325,24 +314,87 @@ out_oom:
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return -1;
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}
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static int lowpan_get_frag_info(struct sk_buff *skb, const u8 frag_type,
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struct lowpan_frag_info *frag_info)
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static int lowpan_frag_rx_handlers_result(struct sk_buff *skb,
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lowpan_rx_result res)
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{
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switch (res) {
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case RX_QUEUED:
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return NET_RX_SUCCESS;
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case RX_CONTINUE:
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/* nobody cared about this packet */
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net_warn_ratelimited("%s: received unknown dispatch\n",
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__func__);
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/* fall-through */
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default:
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/* all others failure */
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return NET_RX_DROP;
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}
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}
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static lowpan_rx_result lowpan_frag_rx_h_iphc(struct sk_buff *skb)
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{
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int ret;
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if (!lowpan_is_iphc(*skb_network_header(skb)))
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return RX_CONTINUE;
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ret = lowpan_iphc_decompress(skb);
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if (ret < 0)
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return RX_DROP;
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return RX_QUEUED;
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}
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static int lowpan_invoke_frag_rx_handlers(struct sk_buff *skb)
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{
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lowpan_rx_result res;
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#define CALL_RXH(rxh) \
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do { \
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res = rxh(skb); \
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if (res != RX_CONTINUE) \
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goto rxh_next; \
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} while (0)
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/* likely at first */
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CALL_RXH(lowpan_frag_rx_h_iphc);
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CALL_RXH(lowpan_rx_h_ipv6);
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rxh_next:
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return lowpan_frag_rx_handlers_result(skb, res);
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#undef CALL_RXH
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}
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#define LOWPAN_FRAG_DGRAM_SIZE_HIGH_MASK 0x07
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#define LOWPAN_FRAG_DGRAM_SIZE_HIGH_SHIFT 8
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static int lowpan_get_cb(struct sk_buff *skb, u8 frag_type,
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struct lowpan_802154_cb *cb)
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{
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bool fail;
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u8 pattern = 0, low = 0;
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u8 high = 0, low = 0;
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__be16 d_tag = 0;
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fail = lowpan_fetch_skb(skb, &pattern, 1);
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fail = lowpan_fetch_skb(skb, &high, 1);
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fail |= lowpan_fetch_skb(skb, &low, 1);
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frag_info->d_size = (pattern & 7) << 8 | low;
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/* remove the dispatch value and use first three bits as high value
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* for the datagram size
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*/
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cb->d_size = (high & LOWPAN_FRAG_DGRAM_SIZE_HIGH_MASK) <<
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LOWPAN_FRAG_DGRAM_SIZE_HIGH_SHIFT | low;
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fail |= lowpan_fetch_skb(skb, &d_tag, 2);
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frag_info->d_tag = ntohs(d_tag);
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cb->d_tag = ntohs(d_tag);
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if (frag_type == LOWPAN_DISPATCH_FRAGN) {
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fail |= lowpan_fetch_skb(skb, &frag_info->d_offset, 1);
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fail |= lowpan_fetch_skb(skb, &cb->d_offset, 1);
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} else {
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skb_reset_network_header(skb);
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frag_info->d_offset = 0;
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cb->d_offset = 0;
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/* check if datagram_size has ipv6hdr on FRAG1 */
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fail |= cb->d_size < sizeof(struct ipv6hdr);
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/* check if we can dereference the dispatch value */
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fail |= !skb->len;
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}
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if (unlikely(fail))
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@ -351,27 +403,33 @@ static int lowpan_get_frag_info(struct sk_buff *skb, const u8 frag_type,
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return 0;
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}
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int lowpan_frag_rcv(struct sk_buff *skb, const u8 frag_type)
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int lowpan_frag_rcv(struct sk_buff *skb, u8 frag_type)
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{
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struct lowpan_frag_queue *fq;
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struct net *net = dev_net(skb->dev);
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struct lowpan_frag_info *frag_info = lowpan_cb(skb);
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struct ieee802154_addr source, dest;
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struct lowpan_802154_cb *cb = lowpan_802154_cb(skb);
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struct ieee802154_hdr hdr;
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int err;
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source = mac_cb(skb)->source;
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dest = mac_cb(skb)->dest;
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if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0)
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goto err;
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err = lowpan_get_frag_info(skb, frag_type, frag_info);
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err = lowpan_get_cb(skb, frag_type, cb);
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if (err < 0)
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goto err;
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if (frag_info->d_size > IPV6_MIN_MTU) {
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if (frag_type == LOWPAN_DISPATCH_FRAG1) {
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err = lowpan_invoke_frag_rx_handlers(skb);
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if (err == NET_RX_DROP)
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goto err;
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}
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if (cb->d_size > IPV6_MIN_MTU) {
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net_warn_ratelimited("lowpan_frag_rcv: datagram size exceeds MTU\n");
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goto err;
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}
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fq = fq_find(net, frag_info, &source, &dest);
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fq = fq_find(net, cb, &hdr.source, &hdr.dest);
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if (fq != NULL) {
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int ret;
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@ -15,8 +15,9 @@
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#include "6lowpan_i.h"
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static int lowpan_give_skb_to_device(struct sk_buff *skb,
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struct net_device *wdev)
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#define LOWPAN_DISPATCH_FRAG_MASK 0xf8
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static int lowpan_give_skb_to_device(struct sk_buff *skb)
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{
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skb->protocol = htons(ETH_P_IPV6);
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skb->pkt_type = PACKET_HOST;
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@ -24,21 +25,77 @@ static int lowpan_give_skb_to_device(struct sk_buff *skb,
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return netif_rx(skb);
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}
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static int
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iphc_decompress(struct sk_buff *skb, const struct ieee802154_hdr *hdr)
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static int lowpan_rx_handlers_result(struct sk_buff *skb, lowpan_rx_result res)
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{
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switch (res) {
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case RX_CONTINUE:
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/* nobody cared about this packet */
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net_warn_ratelimited("%s: received unknown dispatch\n",
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__func__);
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/* fall-through */
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case RX_DROP_UNUSABLE:
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kfree_skb(skb);
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/* fall-through */
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case RX_DROP:
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return NET_RX_DROP;
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case RX_QUEUED:
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return lowpan_give_skb_to_device(skb);
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default:
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break;
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}
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return NET_RX_DROP;
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}
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static inline bool lowpan_is_frag1(u8 dispatch)
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{
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return (dispatch & LOWPAN_DISPATCH_FRAG_MASK) == LOWPAN_DISPATCH_FRAG1;
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}
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static inline bool lowpan_is_fragn(u8 dispatch)
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{
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return (dispatch & LOWPAN_DISPATCH_FRAG_MASK) == LOWPAN_DISPATCH_FRAGN;
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}
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static lowpan_rx_result lowpan_rx_h_frag(struct sk_buff *skb)
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{
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int ret;
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if (!(lowpan_is_frag1(*skb_network_header(skb)) ||
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lowpan_is_fragn(*skb_network_header(skb))))
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return RX_CONTINUE;
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ret = lowpan_frag_rcv(skb, *skb_network_header(skb) &
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LOWPAN_DISPATCH_FRAG_MASK);
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if (ret == 1)
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return RX_QUEUED;
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/* Packet is freed by lowpan_frag_rcv on error or put into the frag
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* bucket.
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*/
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return RX_DROP;
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}
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|
||||
int lowpan_iphc_decompress(struct sk_buff *skb)
|
||||
{
|
||||
u8 iphc0, iphc1;
|
||||
struct ieee802154_addr_sa sa, da;
|
||||
struct ieee802154_hdr hdr;
|
||||
u8 iphc0, iphc1;
|
||||
void *sap, *dap;
|
||||
|
||||
if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0)
|
||||
return -EINVAL;
|
||||
|
||||
raw_dump_table(__func__, "raw skb data dump", skb->data, skb->len);
|
||||
|
||||
if (lowpan_fetch_skb_u8(skb, &iphc0) ||
|
||||
lowpan_fetch_skb_u8(skb, &iphc1))
|
||||
return -EINVAL;
|
||||
|
||||
ieee802154_addr_to_sa(&sa, &hdr->source);
|
||||
ieee802154_addr_to_sa(&da, &hdr->dest);
|
||||
ieee802154_addr_to_sa(&sa, &hdr.source);
|
||||
ieee802154_addr_to_sa(&da, &hdr.dest);
|
||||
|
||||
if (sa.addr_type == IEEE802154_ADDR_SHORT)
|
||||
sap = &sa.short_addr;
|
||||
|
|
@ -55,78 +112,87 @@ iphc_decompress(struct sk_buff *skb, const struct ieee802154_hdr *hdr)
|
|||
IEEE802154_ADDR_LEN, iphc0, iphc1);
|
||||
}
|
||||
|
||||
static lowpan_rx_result lowpan_rx_h_iphc(struct sk_buff *skb)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (!lowpan_is_iphc(*skb_network_header(skb)))
|
||||
return RX_CONTINUE;
|
||||
|
||||
/* Setting datagram_offset to zero indicates non frag handling
|
||||
* while doing lowpan_header_decompress.
|
||||
*/
|
||||
lowpan_802154_cb(skb)->d_size = 0;
|
||||
|
||||
ret = lowpan_iphc_decompress(skb);
|
||||
if (ret < 0)
|
||||
return RX_DROP_UNUSABLE;
|
||||
|
||||
return RX_QUEUED;
|
||||
}
|
||||
|
||||
lowpan_rx_result lowpan_rx_h_ipv6(struct sk_buff *skb)
|
||||
{
|
||||
if (!lowpan_is_ipv6(*skb_network_header(skb)))
|
||||
return RX_CONTINUE;
|
||||
|
||||
/* Pull off the 1-byte of 6lowpan header. */
|
||||
skb_pull(skb, 1);
|
||||
return RX_QUEUED;
|
||||
}
|
||||
|
||||
static int lowpan_invoke_rx_handlers(struct sk_buff *skb)
|
||||
{
|
||||
lowpan_rx_result res;
|
||||
|
||||
#define CALL_RXH(rxh) \
|
||||
do { \
|
||||
res = rxh(skb); \
|
||||
if (res != RX_CONTINUE) \
|
||||
goto rxh_next; \
|
||||
} while (0)
|
||||
|
||||
/* likely at first */
|
||||
CALL_RXH(lowpan_rx_h_iphc);
|
||||
CALL_RXH(lowpan_rx_h_frag);
|
||||
CALL_RXH(lowpan_rx_h_ipv6);
|
||||
|
||||
rxh_next:
|
||||
return lowpan_rx_handlers_result(skb, res);
|
||||
#undef CALL_RXH
|
||||
}
|
||||
|
||||
static int lowpan_rcv(struct sk_buff *skb, struct net_device *wdev,
|
||||
struct packet_type *pt, struct net_device *orig_wdev)
|
||||
{
|
||||
struct ieee802154_hdr hdr;
|
||||
struct net_device *ldev;
|
||||
int ret;
|
||||
|
||||
if (wdev->type != ARPHRD_IEEE802154 ||
|
||||
skb->pkt_type == PACKET_OTHERHOST)
|
||||
goto drop;
|
||||
return NET_RX_DROP;
|
||||
|
||||
ldev = wdev->ieee802154_ptr->lowpan_dev;
|
||||
if (!ldev || !netif_running(ldev))
|
||||
goto drop;
|
||||
return NET_RX_DROP;
|
||||
|
||||
/* Replacing skb->dev and followed rx handlers will manipulate skb. */
|
||||
skb = skb_share_check(skb, GFP_ATOMIC);
|
||||
if (!skb)
|
||||
goto drop;
|
||||
return NET_RX_DROP;
|
||||
skb->dev = ldev;
|
||||
|
||||
if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0)
|
||||
goto drop_skb;
|
||||
|
||||
/* check that it's our buffer */
|
||||
if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
|
||||
/* Pull off the 1-byte of 6lowpan header. */
|
||||
skb_pull(skb, 1);
|
||||
return lowpan_give_skb_to_device(skb, wdev);
|
||||
} else {
|
||||
switch (skb->data[0] & 0xe0) {
|
||||
case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
|
||||
ret = iphc_decompress(skb, &hdr);
|
||||
if (ret < 0)
|
||||
goto drop_skb;
|
||||
|
||||
return lowpan_give_skb_to_device(skb, wdev);
|
||||
case LOWPAN_DISPATCH_FRAG1: /* first fragment header */
|
||||
ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAG1);
|
||||
if (ret == 1) {
|
||||
ret = iphc_decompress(skb, &hdr);
|
||||
if (ret < 0)
|
||||
goto drop_skb;
|
||||
|
||||
return lowpan_give_skb_to_device(skb, wdev);
|
||||
} else if (ret == -1) {
|
||||
return NET_RX_DROP;
|
||||
} else {
|
||||
return NET_RX_SUCCESS;
|
||||
}
|
||||
case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */
|
||||
ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAGN);
|
||||
if (ret == 1) {
|
||||
ret = iphc_decompress(skb, &hdr);
|
||||
if (ret < 0)
|
||||
goto drop_skb;
|
||||
|
||||
return lowpan_give_skb_to_device(skb, wdev);
|
||||
} else if (ret == -1) {
|
||||
return NET_RX_DROP;
|
||||
} else {
|
||||
return NET_RX_SUCCESS;
|
||||
}
|
||||
default:
|
||||
break;
|
||||
}
|
||||
/* When receive frag1 it's likely that we manipulate the buffer.
|
||||
* When recevie iphc we manipulate the data buffer. So we need
|
||||
* to unshare the buffer.
|
||||
*/
|
||||
if (lowpan_is_frag1(*skb_network_header(skb)) ||
|
||||
lowpan_is_iphc(*skb_network_header(skb))) {
|
||||
skb = skb_unshare(skb, GFP_ATOMIC);
|
||||
if (!skb)
|
||||
return RX_DROP;
|
||||
}
|
||||
|
||||
drop_skb:
|
||||
kfree_skb(skb);
|
||||
drop:
|
||||
return NET_RX_DROP;
|
||||
return lowpan_invoke_rx_handlers(skb);
|
||||
}
|
||||
|
||||
static struct packet_type lowpan_packet_type = {
|
||||
|
|
|
|||
Loading…
Reference in New Issue