/* SPDX-License-Identifier: BSD-3-Clause * Copyright(c) 1982, 1986, 1990, 1993 * The Regents of the University of California. * Copyright(c) 2010-2014 Intel Corporation. * Copyright(c) 2014 6WIND S.A. * All rights reserved. */ #ifndef _RTE_IP_H_ #define _RTE_IP_H_ /** * @file * * IP-related defines */ #include #include #include #include #ifdef __cplusplus extern "C" { #endif /** * IPv4 Header */ struct ipv4_hdr { uint8_t version_ihl; /**< version and header length */ uint8_t type_of_service; /**< type of service */ uint16_t total_length; /**< length of packet */ uint16_t packet_id; /**< packet ID */ uint16_t fragment_offset; /**< fragmentation offset */ uint8_t time_to_live; /**< time to live */ uint8_t next_proto_id; /**< protocol ID */ uint16_t hdr_checksum; /**< header checksum */ uint32_t src_addr; /**< source address */ uint32_t dst_addr; /**< destination address */ } __attribute__((__packed__)); /** Create IPv4 address */ #define IPv4(a,b,c,d) ((uint32_t)(((a) & 0xff) << 24) | \ (((b) & 0xff) << 16) | \ (((c) & 0xff) << 8) | \ ((d) & 0xff)) /** Maximal IPv4 packet length (including a header) */ #define IPV4_MAX_PKT_LEN 65535 /** Internet header length mask for version_ihl field */ #define IPV4_HDR_IHL_MASK (0x0f) /** * Internet header length field multiplier (IHL field specifies overall header * length in number of 4-byte words) */ #define IPV4_IHL_MULTIPLIER (4) /* Fragment Offset * Flags. */ #define IPV4_HDR_DF_SHIFT 14 #define IPV4_HDR_MF_SHIFT 13 #define IPV4_HDR_FO_SHIFT 3 #define IPV4_HDR_DF_FLAG (1 << IPV4_HDR_DF_SHIFT) #define IPV4_HDR_MF_FLAG (1 << IPV4_HDR_MF_SHIFT) #define IPV4_HDR_OFFSET_MASK ((1 << IPV4_HDR_MF_SHIFT) - 1) #define IPV4_HDR_OFFSET_UNITS 8 /* * IPv4 address types */ #define IPV4_ANY ((uint32_t)0x00000000) /**< 0.0.0.0 */ #define IPV4_LOOPBACK ((uint32_t)0x7f000001) /**< 127.0.0.1 */ #define IPV4_BROADCAST ((uint32_t)0xe0000000) /**< 224.0.0.0 */ #define IPV4_ALLHOSTS_GROUP ((uint32_t)0xe0000001) /**< 224.0.0.1 */ #define IPV4_ALLRTRS_GROUP ((uint32_t)0xe0000002) /**< 224.0.0.2 */ #define IPV4_MAX_LOCAL_GROUP ((uint32_t)0xe00000ff) /**< 224.0.0.255 */ /* * IPv4 Multicast-related macros */ #define IPV4_MIN_MCAST IPv4(224, 0, 0, 0) /**< Minimal IPv4-multicast address */ #define IPV4_MAX_MCAST IPv4(239, 255, 255, 255) /**< Maximum IPv4 multicast address */ #define IS_IPV4_MCAST(x) \ ((x) >= IPV4_MIN_MCAST && (x) <= IPV4_MAX_MCAST) /**< check if IPv4 address is multicast */ /** * @internal Calculate a sum of all words in the buffer. * Helper routine for the rte_raw_cksum(). * * @param buf * Pointer to the buffer. * @param len * Length of the buffer. * @param sum * Initial value of the sum. * @return * sum += Sum of all words in the buffer. */ 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; typedef uint16_t __attribute__((__may_alias__)) u16_p; const u16_p *u16 = (const u16_p *)ptr; while (len >= (sizeof(*u16) * 4)) { sum += u16[0]; sum += u16[1]; sum += u16[2]; sum += u16[3]; len -= sizeof(*u16) * 4; u16 += 4; } while (len >= sizeof(*u16)) { sum += *u16; len -= sizeof(*u16); u16 += 1; } /* if length is in odd bytes */ if (len == 1) sum += *((const uint8_t *)u16); return sum; } /** * @internal Reduce a sum to the non-complemented checksum. * Helper routine for the rte_raw_cksum(). * * @param sum * Value of the sum. * @return * The non-complemented checksum. */ static inline uint16_t __rte_raw_cksum_reduce(uint32_t sum) { sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff); sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff); return (uint16_t)sum; } /** * Process the non-complemented checksum of a buffer. * * @param buf * Pointer to the buffer. * @param len * Length of the buffer. * @return * The non-complemented checksum. */ static inline uint16_t rte_raw_cksum(const void *buf, size_t len) { uint32_t sum; sum = __rte_raw_cksum(buf, len, 0); return __rte_raw_cksum_reduce(sum); } /** * Compute the raw (non complemented) checksum of a packet. * * @param m * The pointer to the mbuf. * @param off * The offset in bytes to start the checksum. * @param len * The length in bytes of the data to checksum. * @param cksum * A pointer to the checksum, filled on success. * @return * 0 on success, -1 on error (bad length or offset). */ static inline int rte_raw_cksum_mbuf(const struct rte_mbuf *m, uint32_t off, uint32_t len, uint16_t *cksum) { const struct rte_mbuf *seg; const char *buf; uint32_t sum, tmp; uint32_t seglen, done; /* easy case: all data in the first segment */ if (off + len <= rte_pktmbuf_data_len(m)) { *cksum = rte_raw_cksum(rte_pktmbuf_mtod_offset(m, const char *, off), len); return 0; } if (unlikely(off + len > rte_pktmbuf_pkt_len(m))) return -1; /* invalid params, return a dummy value */ /* else browse the segment to find offset */ seglen = 0; for (seg = m; seg != NULL; seg = seg->next) { seglen = rte_pktmbuf_data_len(seg); if (off < seglen) break; off -= seglen; } seglen -= off; buf = rte_pktmbuf_mtod_offset(seg, const char *, off); if (seglen >= len) { /* all in one segment */ *cksum = rte_raw_cksum(buf, len); return 0; } /* hard case: process checksum of several segments */ sum = 0; done = 0; for (;;) { tmp = __rte_raw_cksum(buf, seglen, 0); if (done & 1) tmp = rte_bswap16(tmp); sum += tmp; done += seglen; if (done == len) break; seg = seg->next; buf = rte_pktmbuf_mtod(seg, const char *); seglen = rte_pktmbuf_data_len(seg); if (seglen > len - done) seglen = len - done; } *cksum = __rte_raw_cksum_reduce(sum); return 0; } /** * Process the IPv4 checksum of an IPv4 header. * * The checksum field must be set to 0 by the caller. * * @param ipv4_hdr * The pointer to the contiguous IPv4 header. * @return * The complemented checksum to set in the IP packet. */ static inline uint16_t rte_ipv4_cksum(const struct ipv4_hdr *ipv4_hdr) { uint16_t cksum; cksum = rte_raw_cksum(ipv4_hdr, sizeof(struct ipv4_hdr)); return (cksum == 0xffff) ? cksum : ~cksum; } /** * Process the pseudo-header checksum of an IPv4 header. * * The checksum field must be set to 0 by the caller. * * Depending on the ol_flags, the pseudo-header checksum expected by the * drivers is not the same. For instance, when TSO is enabled, the IP * payload length must not be included in the packet. * * When ol_flags is 0, it computes the standard pseudo-header checksum. * * @param ipv4_hdr * The pointer to the contiguous IPv4 header. * @param ol_flags * The ol_flags of the associated mbuf. * @return * The non-complemented checksum to set in the L4 header. */ static inline uint16_t rte_ipv4_phdr_cksum(const struct ipv4_hdr *ipv4_hdr, uint64_t ol_flags) { struct ipv4_psd_header { uint32_t src_addr; /* IP address of source host. */ uint32_t dst_addr; /* IP address of destination host. */ uint8_t zero; /* zero. */ uint8_t proto; /* L4 protocol type. */ uint16_t len; /* L4 length. */ } psd_hdr; psd_hdr.src_addr = ipv4_hdr->src_addr; 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) { psd_hdr.len = 0; } else { psd_hdr.len = rte_cpu_to_be_16( (uint16_t)(rte_be_to_cpu_16(ipv4_hdr->total_length) - sizeof(struct ipv4_hdr))); } return rte_raw_cksum(&psd_hdr, sizeof(psd_hdr)); } /** * Process the IPv4 UDP or TCP checksum. * * The IPv4 header should not contains options. The IP and layer 4 * checksum must be set to 0 in the packet 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. */ static inline uint16_t rte_ipv4_udptcp_cksum(const struct ipv4_hdr *ipv4_hdr, const void *l4_hdr) { uint32_t cksum; uint32_t l4_len; l4_len = rte_be_to_cpu_16(ipv4_hdr->total_length) - sizeof(struct ipv4_hdr); cksum = rte_raw_cksum(l4_hdr, l4_len); cksum += rte_ipv4_phdr_cksum(ipv4_hdr, 0); cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff); cksum = (~cksum) & 0xffff; if (cksum == 0) cksum = 0xffff; return cksum; } /** * IPv6 Header */ struct ipv6_hdr { uint32_t vtc_flow; /**< IP version, traffic class & flow label. */ uint16_t payload_len; /**< IP packet length - includes sizeof(ip_header). */ uint8_t proto; /**< Protocol, next header. */ uint8_t hop_limits; /**< Hop limits. */ uint8_t src_addr[16]; /**< IP address of source host. */ uint8_t dst_addr[16]; /**< IP address of destination host(s). */ } __attribute__((__packed__)); /** * Process the pseudo-header checksum of an IPv6 header. * * Depending on the ol_flags, the pseudo-header checksum expected by the * drivers is not the same. For instance, when TSO is enabled, the IPv6 * payload length must not be included in the packet. * * When ol_flags is 0, it computes the standard pseudo-header checksum. * * @param ipv6_hdr * The pointer to the contiguous IPv6 header. * @param ol_flags * The ol_flags of the associated mbuf. * @return * The non-complemented checksum to set in the L4 header. */ static inline uint16_t rte_ipv6_phdr_cksum(const struct ipv6_hdr *ipv6_hdr, uint64_t ol_flags) { uint32_t sum; struct { uint32_t len; /* L4 length. */ uint32_t proto; /* L4 protocol - top 3 bytes must be zero */ } psd_hdr; psd_hdr.proto = (ipv6_hdr->proto << 24); if (ol_flags & PKT_TX_TCP_SEG) { psd_hdr.len = 0; } else { psd_hdr.len = ipv6_hdr->payload_len; } sum = __rte_raw_cksum(ipv6_hdr->src_addr, sizeof(ipv6_hdr->src_addr) + sizeof(ipv6_hdr->dst_addr), 0); sum = __rte_raw_cksum(&psd_hdr, sizeof(psd_hdr), sum); return __rte_raw_cksum_reduce(sum); } /** * 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. * * @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. */ static inline uint16_t rte_ipv6_udptcp_cksum(const struct ipv6_hdr *ipv6_hdr, const void *l4_hdr) { uint32_t cksum; uint32_t l4_len; l4_len = rte_be_to_cpu_16(ipv6_hdr->payload_len); cksum = rte_raw_cksum(l4_hdr, l4_len); cksum += rte_ipv6_phdr_cksum(ipv6_hdr, 0); cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff); cksum = (~cksum) & 0xffff; if (cksum == 0) cksum = 0xffff; return cksum; } #ifdef __cplusplus } #endif #endif /* _RTE_IP_H_ */