X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;ds=sidebyside;f=lib%2Flibrte_net%2Frte_ip.h;h=fcd1eb342d34d9e9ca8f0756693cb963bd0055d9;hb=0f9ac2afa62ebacd24f36a3b98272b7146be3edd;hp=a69430f9b71599702b2af32b928ffcd406fa35ed;hpb=ef5baf3486e03004b6d807f731f0d9936504511d;p=dpdk.git

diff --git a/lib/librte_net/rte_ip.h b/lib/librte_net/rte_ip.h
index a69430f9b7..fcd1eb342d 100644
--- a/lib/librte_net/rte_ip.h
+++ b/lib/librte_net/rte_ip.h
@@ -139,8 +139,11 @@ __rte_raw_cksum(const void *buf, size_t len, uint32_t sum)
 	}
 
 	/* if length is in odd bytes */
-	if (len == 1)
-		sum += *((const uint8_t *)u16_buf);
+	if (len == 1) {
+		uint16_t left = 0;
+		*(uint8_t *)&left = *(const uint8_t *)u16_buf;
+		sum += left;
+	}
 
 	return sum;
 }
@@ -267,7 +270,7 @@ rte_ipv4_cksum(const struct rte_ipv4_hdr *ipv4_hdr)
 {
 	uint16_t cksum;
 	cksum = rte_raw_cksum(ipv4_hdr, sizeof(struct rte_ipv4_hdr));
-	return (cksum == 0xffff) ? cksum : (uint16_t)~cksum;
+	return (uint16_t)~cksum;
 }
 
 /**
@@ -324,8 +327,7 @@ rte_ipv4_phdr_cksum(const struct rte_ipv4_hdr *ipv4_hdr, uint64_t ol_flags)
  * @param l4_hdr
  *   The pointer to the beginning of the L4 header.
  * @return
- *   The complemented checksum to set in the IP packet
- *   or 0 on error
+ *   The complemented checksum to set in the IP packet.
  */
 static inline uint16_t
 rte_ipv4_udptcp_cksum(const struct rte_ipv4_hdr *ipv4_hdr, const void *l4_hdr)
@@ -344,7 +346,12 @@ rte_ipv4_udptcp_cksum(const struct rte_ipv4_hdr *ipv4_hdr, const void *l4_hdr)
 
 	cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
 	cksum = (~cksum) & 0xffff;
-	if (cksum == 0)
+	/*
+	 * Per RFC 768:If the computed checksum is zero for UDP,
+	 * it is transmitted as all ones
+	 * (the equivalent in one's complement arithmetic).
+	 */
+	if (cksum == 0 && ipv4_hdr->next_proto_id == IPPROTO_UDP)
 		cksum = 0xffff;
 
 	return (uint16_t)cksum;
@@ -371,6 +378,8 @@ struct rte_ipv6_hdr {
 #define RTE_IPV6_HDR_ECN_MASK	(0x03 << RTE_IPV6_HDR_TC_SHIFT)
 #define RTE_IPV6_HDR_ECN_CE	RTE_IPV6_HDR_ECN_MASK
 
+#define RTE_IPV6_MIN_MTU 1280 /**< Minimum MTU for IPv6, see RFC 8200. */
+
 /**
  * Process the pseudo-header checksum of an IPv6 header.
  *
@@ -436,7 +445,12 @@ rte_ipv6_udptcp_cksum(const struct rte_ipv6_hdr *ipv6_hdr, const void *l4_hdr)
 
 	cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
 	cksum = (~cksum) & 0xffff;
-	if (cksum == 0)
+	/*
+	 * Per RFC 768: If the computed checksum is zero for UDP,
+	 * it is transmitted as all ones
+	 * (the equivalent in one's complement arithmetic).
+	 */
+	if (cksum == 0 && ipv6_hdr->proto == IPPROTO_UDP)
 		cksum = 0xffff;
 
 	return (uint16_t)cksum;