[PATCH net-next 5/6] 6lowpan: udp use lowpan_fetch_skb function
From: Alexander Aring <hidden>
Date: 2013-11-14 15:48:51
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
Cleanup the lowpan_uncompress_udp_header function to use the lowpan_fetch_skb function. Signed-off-by: Alexander Aring <redacted> --- net/ieee802154/6lowpan.c | 40 ++++++++++++++++++---------------------- 1 file changed, 18 insertions(+), 22 deletions(-)
diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index 59678da..6d7f253 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c@@ -405,40 +405,34 @@ static inline int lowpan_fetch_skb_u16(struct sk_buff *skb, u16 *val) static int lowpan_uncompress_udp_header(struct sk_buff *skb, struct udphdr *uh) { - u8 tmp; - - if (!uh) - goto err; + bool fail; + u8 tmp = 0, val = 0; - if (lowpan_fetch_skb_u8(skb, &tmp)) - goto err; + fail = lowpan_fetch_skb(skb, &tmp, 1); if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) { pr_debug("UDP header uncompression\n"); switch (tmp & LOWPAN_NHC_UDP_CS_P_11) { case LOWPAN_NHC_UDP_CS_P_00: - memcpy(&uh->source, &skb->data[0], 2); - memcpy(&uh->dest, &skb->data[2], 2); - skb_pull(skb, 4); + fail |= lowpan_fetch_skb(skb, &uh->source, 2); + fail |= lowpan_fetch_skb(skb, &uh->dest, 2); break; case LOWPAN_NHC_UDP_CS_P_01: - memcpy(&uh->source, &skb->data[0], 2); - uh->dest = htons(skb->data[2] + - LOWPAN_NHC_UDP_8BIT_PORT); - skb_pull(skb, 3); + fail |= lowpan_fetch_skb(skb, &uh->source, 2); + fail |= lowpan_fetch_skb(skb, &val, 1); + uh->dest = htons(val + LOWPAN_NHC_UDP_8BIT_PORT); break; case LOWPAN_NHC_UDP_CS_P_10: - uh->source = htons(skb->data[0] + - LOWPAN_NHC_UDP_8BIT_PORT); - memcpy(&uh->dest, &skb->data[1], 2); - skb_pull(skb, 3); + fail |= lowpan_fetch_skb(skb, &val, 1); + uh->source = htons(val + LOWPAN_NHC_UDP_8BIT_PORT); + fail |= lowpan_fetch_skb(skb, &uh->dest, 2); break; case LOWPAN_NHC_UDP_CS_P_11: + fail |= lowpan_fetch_skb(skb, &val, 1); uh->source = htons(LOWPAN_NHC_UDP_4BIT_PORT + - (skb->data[0] >> 4)); + (val >> 4)); uh->dest = htons(LOWPAN_NHC_UDP_4BIT_PORT + - (skb->data[0] & 0x0f)); - skb_pull(skb, 1); + (val & 0x0f)); break; default: pr_debug("ERROR: unknown UDP format\n");
@@ -453,8 +447,7 @@ lowpan_uncompress_udp_header(struct sk_buff *skb, struct udphdr *uh) pr_debug("checksum elided currently not supported"); goto err; } else { - memcpy(&uh->check, &skb->data[0], 2); - skb_pull(skb, 2); + fail |= lowpan_fetch_skb(skb, &uh->check, 2); } /*
@@ -469,6 +462,9 @@ lowpan_uncompress_udp_header(struct sk_buff *skb, struct udphdr *uh) goto err; } + if (fail) + goto err; + return 0; err: return -EINVAL;
--
1.8.4.2
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