[PATCH net-next 6/6] 6lowpan: handle context based source address
From: Alexander Aring <hidden>
Date: 2013-08-14 11:01:48
Subsystem:
ieee 802.15.4 subsystem, networking [general], the rest · Maintainers:
Alexander Aring, Stefan Schmidt, Miquel Raynal, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Possibly related (same subject, not in this thread)
- 2013-08-16 · [PATCH net-next 6/6] 6lowpan: handle context based source address · Alexander Aring <hidden>
Handle context based address when a unspecific address is specified. For other context based address we print a warning and drop the packet currently because we don't support it right now. Signed-off-by: Alexander Aring <redacted> Reviewed-by: Werner Almesberger <redacted> --- net/ieee802154/6lowpan.c | 48 +++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 45 insertions(+), 3 deletions(-)
diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index d299560..90eddce 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c@@ -243,6 +243,39 @@ lowpan_uncompress_addr(struct sk_buff *skb, return 0; } +/* Uncompress address function for source context + * based address(non-multicast). + */ +static int +lowpan_uncompress_context_based_src_addr(struct sk_buff *skb, + struct in6_addr *ipaddr, + const u8 sam) +{ + switch (sam) { + case LOWPAN_IPHC_ADDR_00: + /* unspec address :: + * Do nothing, address is already :: + */ + break; + case LOWPAN_IPHC_ADDR_01: + /* TODO */ + case LOWPAN_IPHC_ADDR_02: + /* TODO */ + case LOWPAN_IPHC_ADDR_03: + /* TODO */ + netdev_warn(skb->dev, "SAM value 0x%x not supported\n", sam); + return -EINVAL; + default: + pr_debug("Invalid sam value: 0x%x\n", sam); + return -EINVAL; + } + + pr_debug("Reconstructed context based ipv6 src addr is:\n"); + lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16); + + return 0; +} + /* Uncompress function for multicast destination address, * when M bit is set. */
@@ -971,9 +1004,18 @@ lowpan_process_data(struct sk_buff *skb) /* Extract SAM to the tmp variable */ tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03; - /* Source address uncompression */ - pr_debug("source address stateless compression\n"); - err = lowpan_uncompress_addr(skb, &hdr.saddr, tmp, _saddr); + if (iphc1 & LOWPAN_IPHC_SAC) { + /* Source address context based uncompression */ + pr_debug("SAC bit is set. Handle context based source address.\n"); + err = lowpan_uncompress_context_based_src_addr( + skb, &hdr.saddr, tmp); + } else { + /* Source address uncompression */ + pr_debug("source address stateless compression\n"); + err = lowpan_uncompress_addr(skb, &hdr.saddr, tmp, _saddr); + } + + /* Check on error of previous branch */ if (err) goto drop;
--
1.8.3.3
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