#include <netinet/in.h>
#include <arpa/inet.h>
#include <netinet/ip.h>
+#include <netinet/ip6.h>
#endif
#include <rte_byteorder.h>
* IPv4 Header
*/
struct rte_ipv4_hdr {
- uint8_t version_ihl; /**< version and header length */
+ __extension__
+ union {
+ uint8_t version_ihl; /**< version and header length */
+ struct {
+#if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
+ uint8_t ihl:4; /**< header length */
+ uint8_t version:4; /**< version */
+#elif RTE_BYTE_ORDER == RTE_BIG_ENDIAN
+ uint8_t version:4; /**< version */
+ uint8_t ihl:4; /**< header length */
+#endif
+ };
+ };
uint8_t type_of_service; /**< type of service */
rte_be16_t total_length; /**< length of packet */
rte_be16_t packet_id; /**< packet ID */
static inline uint32_t
__rte_raw_cksum(const void *buf, size_t len, uint32_t sum)
{
- /* workaround gcc strict-aliasing warning */
- uintptr_t ptr = (uintptr_t)buf;
+ /* extend strict-aliasing rules */
typedef uint16_t __attribute__((__may_alias__)) u16_p;
- const u16_p *u16_buf = (const u16_p *)ptr;
-
- while (len >= (sizeof(*u16_buf) * 4)) {
- sum += u16_buf[0];
- sum += u16_buf[1];
- sum += u16_buf[2];
- sum += u16_buf[3];
- len -= sizeof(*u16_buf) * 4;
- u16_buf += 4;
- }
- while (len >= sizeof(*u16_buf)) {
+ const u16_p *u16_buf = (const u16_p *)buf;
+ const u16_p *end = u16_buf + len / sizeof(*u16_buf);
+
+ for (; u16_buf != end; ++u16_buf)
sum += *u16_buf;
- len -= sizeof(*u16_buf);
- u16_buf += 1;
- }
- /* if length is in odd bytes */
- if (len == 1) {
+ /* if length is odd, keeping it byte order independent */
+ if (unlikely(len % 2)) {
uint16_t left = 0;
- *(uint8_t *)&left = *(const uint8_t *)u16_buf;
+ *(unsigned char *)&left = *(const unsigned char *)end;
sum += left;
}
psd_hdr.dst_addr = ipv4_hdr->dst_addr;
psd_hdr.zero = 0;
psd_hdr.proto = ipv4_hdr->next_proto_id;
- if (ol_flags & PKT_TX_TCP_SEG) {
+ if (ol_flags & RTE_MBUF_F_TX_TCP_SEG) {
psd_hdr.len = 0;
} else {
l3_len = rte_be_to_cpu_16(ipv4_hdr->total_length);
/**
* Process the IPv4 UDP or TCP checksum.
*
- * The IP and layer 4 checksum must be set to 0 in the packet by
- * the caller.
+ * The layer 4 checksum must be set to 0 in the L4 header by the caller.
*
* @param ipv4_hdr
* The pointer to the contiguous IPv4 header.
* @param l4_hdr
* The pointer to the beginning of the L4 header.
* @return
- * The complemented checksum to set in the IP packet.
+ * The complemented checksum to set in the L4 header.
*/
static inline uint16_t
rte_ipv4_udptcp_cksum(const struct rte_ipv4_hdr *ipv4_hdr, const void *l4_hdr)
return cksum;
}
+/**
+ * @internal Calculate the non-complemented IPv4 L4 checksum of a packet
+ */
+static inline uint16_t
+__rte_ipv4_udptcp_cksum_mbuf(const struct rte_mbuf *m,
+ const struct rte_ipv4_hdr *ipv4_hdr,
+ uint16_t l4_off)
+{
+ uint16_t raw_cksum;
+ uint32_t cksum;
+
+ if (l4_off > m->pkt_len)
+ return 0;
+
+ if (rte_raw_cksum_mbuf(m, l4_off, m->pkt_len - l4_off, &raw_cksum))
+ return 0;
+
+ cksum = raw_cksum + rte_ipv4_phdr_cksum(ipv4_hdr, 0);
+
+ cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
+
+ return (uint16_t)cksum;
+}
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Compute the IPv4 UDP/TCP checksum of a packet.
+ *
+ * @param m
+ * The pointer to the mbuf.
+ * @param ipv4_hdr
+ * The pointer to the contiguous IPv4 header.
+ * @param l4_off
+ * The offset in bytes to start L4 checksum.
+ * @return
+ * The complemented checksum to set in the L4 header.
+ */
+__rte_experimental
+static inline uint16_t
+rte_ipv4_udptcp_cksum_mbuf(const struct rte_mbuf *m,
+ const struct rte_ipv4_hdr *ipv4_hdr, uint16_t l4_off)
+{
+ uint16_t cksum = __rte_ipv4_udptcp_cksum_mbuf(m, ipv4_hdr, l4_off);
+
+ cksum = ~cksum;
+
+ /*
+ * 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 cksum;
+}
+
/**
* Validate the IPv4 UDP or TCP checksum.
*
return 0;
}
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Verify the IPv4 UDP/TCP checksum of a packet.
+ *
+ * In case of UDP, the caller must first check if udp_hdr->dgram_cksum is 0
+ * (i.e. no checksum).
+ *
+ * @param m
+ * The pointer to the mbuf.
+ * @param ipv4_hdr
+ * The pointer to the contiguous IPv4 header.
+ * @param l4_off
+ * The offset in bytes to start L4 checksum.
+ * @return
+ * Return 0 if the checksum is correct, else -1.
+ */
+__rte_experimental
+static inline uint16_t
+rte_ipv4_udptcp_cksum_mbuf_verify(const struct rte_mbuf *m,
+ const struct rte_ipv4_hdr *ipv4_hdr,
+ uint16_t l4_off)
+{
+ uint16_t cksum = __rte_ipv4_udptcp_cksum_mbuf(m, ipv4_hdr, l4_off);
+
+ if (cksum != 0xffff)
+ return -1;
+
+ return 0;
+}
+
/**
* IPv6 Header
*/
} psd_hdr;
psd_hdr.proto = (uint32_t)(ipv6_hdr->proto << 24);
- if (ol_flags & PKT_TX_TCP_SEG) {
+ if (ol_flags & RTE_MBUF_F_TX_TCP_SEG) {
psd_hdr.len = 0;
} else {
psd_hdr.len = ipv6_hdr->payload_len;
}
/**
- * @internal Calculate the non-complemented IPv4 L4 checksum
+ * @internal Calculate the non-complemented IPv6 L4 checksum
*/
static inline uint16_t
__rte_ipv6_udptcp_cksum(const struct rte_ipv6_hdr *ipv6_hdr, const void *l4_hdr)
/**
* Process the IPv6 UDP or TCP checksum.
*
- * The IPv4 header should not contains options. The layer 4 checksum
- * must be set to 0 in the packet by the caller.
+ * The IPv6 header must not be followed by extension headers. The layer 4
+ * checksum must be set to 0 in the L4 header by the caller.
*
* @param ipv6_hdr
* The pointer to the contiguous IPv6 header.
* @param l4_hdr
* The pointer to the beginning of the L4 header.
* @return
- * The complemented checksum to set in the IP packet.
+ * The complemented checksum to set in the L4 header.
*/
static inline uint16_t
rte_ipv6_udptcp_cksum(const struct rte_ipv6_hdr *ipv6_hdr, const void *l4_hdr)
return cksum;
}
+/**
+ * @internal Calculate the non-complemented IPv6 L4 checksum of a packet
+ */
+static inline uint16_t
+__rte_ipv6_udptcp_cksum_mbuf(const struct rte_mbuf *m,
+ const struct rte_ipv6_hdr *ipv6_hdr,
+ uint16_t l4_off)
+{
+ uint16_t raw_cksum;
+ uint32_t cksum;
+
+ if (l4_off > m->pkt_len)
+ return 0;
+
+ if (rte_raw_cksum_mbuf(m, l4_off, m->pkt_len - l4_off, &raw_cksum))
+ return 0;
+
+ cksum = raw_cksum + rte_ipv6_phdr_cksum(ipv6_hdr, 0);
+
+ cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
+
+ return (uint16_t)cksum;
+}
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Process the IPv6 UDP or TCP checksum of a packet.
+ *
+ * The IPv6 header must not be followed by extension headers. The layer 4
+ * checksum must be set to 0 in the L4 header by the caller.
+ *
+ * @param m
+ * The pointer to the mbuf.
+ * @param ipv6_hdr
+ * The pointer to the contiguous IPv6 header.
+ * @param l4_off
+ * The offset in bytes to start L4 checksum.
+ * @return
+ * The complemented checksum to set in the L4 header.
+ */
+__rte_experimental
+static inline uint16_t
+rte_ipv6_udptcp_cksum_mbuf(const struct rte_mbuf *m,
+ const struct rte_ipv6_hdr *ipv6_hdr, uint16_t l4_off)
+{
+ uint16_t cksum = __rte_ipv6_udptcp_cksum_mbuf(m, ipv6_hdr, l4_off);
+
+ cksum = ~cksum;
+
+ /*
+ * 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 cksum;
+}
+
/**
* Validate the IPv6 UDP or TCP checksum.
*
return 0;
}
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Validate the IPv6 UDP or TCP checksum of a packet.
+ *
+ * In case of UDP, the caller must first check if udp_hdr->dgram_cksum is 0:
+ * this is either invalid or means no checksum in some situations. See 8.1
+ * (Upper-Layer Checksums) in RFC 8200.
+ *
+ * @param m
+ * The pointer to the mbuf.
+ * @param ipv6_hdr
+ * The pointer to the contiguous IPv6 header.
+ * @param l4_off
+ * The offset in bytes to start L4 checksum.
+ * @return
+ * Return 0 if the checksum is correct, else -1.
+ */
+__rte_experimental
+static inline int
+rte_ipv6_udptcp_cksum_mbuf_verify(const struct rte_mbuf *m,
+ const struct rte_ipv6_hdr *ipv6_hdr,
+ uint16_t l4_off)
+{
+ uint16_t cksum = __rte_ipv6_udptcp_cksum_mbuf(m, ipv6_hdr, l4_off);
+
+ if (cksum != 0xffff)
+ return -1;
+
+ return 0;
+}
+
/** IPv6 fragment extension header. */
#define RTE_IPV6_EHDR_MF_SHIFT 0
#define RTE_IPV6_EHDR_MF_MASK 1
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