diff options
Diffstat (limited to 'include/net/6lowpan.h')
| -rw-r--r-- | include/net/6lowpan.h | 154 |
1 files changed, 35 insertions, 119 deletions
diff --git a/include/net/6lowpan.h b/include/net/6lowpan.h index a2f59ec..07db532 100644 --- a/include/net/6lowpan.h +++ b/include/net/6lowpan.h @@ -61,6 +61,16 @@ #define UIP_PROTO_UDP 17 /* ipv6 next header value for UDP */ #define UIP_FRAGH_LEN 8 /* ipv6 fragment header size */ +#define EUI64_ADDR_LEN 8 + +#define LOWPAN_NHC_MAX_ID_LEN 1 +/* Max IPHC Header len without IPv6 hdr specific inline data. + * Useful for getting the "extra" bytes we need at worst case compression. + * + * LOWPAN_IPHC + CID + LOWPAN_NHC_MAX_ID_LEN + */ +#define LOWPAN_IPHC_MAX_HEADER_LEN (2 + 1 + LOWPAN_NHC_MAX_ID_LEN) + /* * ipv6 address based on mac * second bit-flip (Universe/Local) is done according RFC2464 @@ -126,13 +136,19 @@ (((a)[6]) == 0xFF) && \ (((a)[7]) == 0xFF)) -#define LOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */ -#define LOWPAN_DISPATCH_HC1 0x42 /* 01000010 = 66 */ -#define LOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */ -#define LOWPAN_DISPATCH_FRAG1 0xc0 /* 11000xxx */ -#define LOWPAN_DISPATCH_FRAGN 0xe0 /* 11100xxx */ +#define LOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */ +#define LOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */ +#define LOWPAN_DISPATCH_IPHC_MASK 0xe0 -#define LOWPAN_DISPATCH_MASK 0xf8 /* 11111000 */ +static inline bool lowpan_is_ipv6(u8 dispatch) +{ + return dispatch == LOWPAN_DISPATCH_IPV6; +} + +static inline bool lowpan_is_iphc(u8 dispatch) +{ + return (dispatch & LOWPAN_DISPATCH_IPHC_MASK) == LOWPAN_DISPATCH_IPHC; +} #define LOWPAN_FRAG_TIMEOUT (HZ * 60) /* time-out 60 sec */ @@ -218,6 +234,19 @@ struct lowpan_priv *lowpan_priv(const struct net_device *dev) return netdev_priv(dev); } +struct lowpan_802154_cb { + u16 d_tag; + unsigned int d_size; + u8 d_offset; +}; + +static inline +struct lowpan_802154_cb *lowpan_802154_cb(const struct sk_buff *skb) +{ + BUILD_BUG_ON(sizeof(struct lowpan_802154_cb) > sizeof(skb->cb)); + return (struct lowpan_802154_cb *)skb->cb; +} + #ifdef DEBUG /* print data in line */ static inline void raw_dump_inline(const char *caller, char *msg, @@ -280,119 +309,6 @@ static inline void lowpan_push_hc_data(u8 **hc_ptr, const void *data, *hc_ptr += len; } -static inline u8 lowpan_addr_mode_size(const u8 addr_mode) -{ - static const u8 addr_sizes[] = { - [LOWPAN_IPHC_ADDR_00] = 16, - [LOWPAN_IPHC_ADDR_01] = 8, - [LOWPAN_IPHC_ADDR_02] = 2, - [LOWPAN_IPHC_ADDR_03] = 0, - }; - return addr_sizes[addr_mode]; -} - -static inline u8 lowpan_next_hdr_size(const u8 h_enc, u16 *uncomp_header) -{ - u8 ret = 1; - - if ((h_enc & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) { - *uncomp_header += sizeof(struct udphdr); - - switch (h_enc & LOWPAN_NHC_UDP_CS_P_11) { - case LOWPAN_NHC_UDP_CS_P_00: - ret += 4; - break; - case LOWPAN_NHC_UDP_CS_P_01: - case LOWPAN_NHC_UDP_CS_P_10: - ret += 3; - break; - case LOWPAN_NHC_UDP_CS_P_11: - ret++; - break; - default: - break; - } - - if (!(h_enc & LOWPAN_NHC_UDP_CS_C)) - ret += 2; - } - - return ret; -} - -/** - * lowpan_uncompress_size - returns skb->len size with uncompressed header - * @skb: sk_buff with 6lowpan header inside - * @datagram_offset: optional to get the datagram_offset value - * - * Returns the skb->len with uncompressed header - */ -static inline u16 -lowpan_uncompress_size(const struct sk_buff *skb, u16 *dgram_offset) -{ - u16 ret = 2, uncomp_header = sizeof(struct ipv6hdr); - u8 iphc0, iphc1, h_enc; - - iphc0 = skb_network_header(skb)[0]; - iphc1 = skb_network_header(skb)[1]; - - switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { - case 0: - ret += 4; - break; - case 1: - ret += 3; - break; - case 2: - ret++; - break; - default: - break; - } - - if (!(iphc0 & LOWPAN_IPHC_NH_C)) - ret++; - - if (!(iphc0 & 0x03)) - ret++; - - ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_SAM) >> - LOWPAN_IPHC_SAM_BIT); - - if (iphc1 & LOWPAN_IPHC_M) { - switch ((iphc1 & LOWPAN_IPHC_DAM_11) >> - LOWPAN_IPHC_DAM_BIT) { - case LOWPAN_IPHC_DAM_00: - ret += 16; - break; - case LOWPAN_IPHC_DAM_01: - ret += 6; - break; - case LOWPAN_IPHC_DAM_10: - ret += 4; - break; - case LOWPAN_IPHC_DAM_11: - ret++; - break; - default: - break; - } - } else { - ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_DAM_11) >> - LOWPAN_IPHC_DAM_BIT); - } - - if (iphc0 & LOWPAN_IPHC_NH_C) { - h_enc = skb_network_header(skb)[ret]; - ret += lowpan_next_hdr_size(h_enc, &uncomp_header); - } - - if (dgram_offset) - *dgram_offset = uncomp_header; - - return skb->len + uncomp_header - ret; -} - void lowpan_netdev_setup(struct net_device *dev, enum lowpan_lltypes lltype); int |
