[qemu.git] / net / eth.c

/*
 * QEMU network structures definitions and helper functions
 *
 * Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com)
 *
 * Developed by Daynix Computing LTD (http://www.daynix.com)
 *
 * Authors:
 * Dmitry Fleytman <[email protected]>
 * Tamir Shomer <[email protected]>
 * Yan Vugenfirer <[email protected]>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 *
 */

#include "qemu/osdep.h"
#include "net/eth.h"
#include "net/checksum.h"
#include "qemu-common.h"
#include "net/tap.h"

void eth_setup_vlan_headers_ex(struct eth_header *ehdr, uint16_t vlan_tag,
    uint16_t vlan_ethtype, bool *is_new)
{
    struct vlan_header *vhdr = PKT_GET_VLAN_HDR(ehdr);

    switch (be16_to_cpu(ehdr->h_proto)) {
    case ETH_P_VLAN:
    case ETH_P_DVLAN:
        /* vlan hdr exists */
        *is_new = false;
        break;

    default:
        /* No VLAN header, put a new one */
        vhdr->h_proto = ehdr->h_proto;
        ehdr->h_proto = cpu_to_be16(vlan_ethtype);
        *is_new = true;
        break;
    }
    vhdr->h_tci = cpu_to_be16(vlan_tag);
}

uint8_t
eth_get_gso_type(uint16_t l3_proto, uint8_t *l3_hdr, uint8_t l4proto)
{
    uint8_t ecn_state = 0;

    if (l3_proto == ETH_P_IP) {
        struct ip_header *iphdr = (struct ip_header *) l3_hdr;

        if (IP_HEADER_VERSION(iphdr) == IP_HEADER_VERSION_4) {
            if (IPTOS_ECN(iphdr->ip_tos) == IPTOS_ECN_CE) {
                ecn_state = VIRTIO_NET_HDR_GSO_ECN;
            }
            if (l4proto == IP_PROTO_TCP) {
                return VIRTIO_NET_HDR_GSO_TCPV4 | ecn_state;
            } else if (l4proto == IP_PROTO_UDP) {
                return VIRTIO_NET_HDR_GSO_UDP | ecn_state;
            }
        }
    } else if (l3_proto == ETH_P_IPV6) {
        struct ip6_header *ip6hdr = (struct ip6_header *) l3_hdr;

        if (IP6_ECN(ip6hdr->ip6_ecn_acc) == IP6_ECN_CE) {
            ecn_state = VIRTIO_NET_HDR_GSO_ECN;
        }

        if (l4proto == IP_PROTO_TCP) {
            return VIRTIO_NET_HDR_GSO_TCPV6 | ecn_state;
        }
    }

    /* Unsupported offload */
    g_assert_not_reached();

    return VIRTIO_NET_HDR_GSO_NONE | ecn_state;
}

uint16_t
eth_get_l3_proto(const struct iovec *l2hdr_iov, int iovcnt, size_t l2hdr_len)
{
    uint16_t proto;
    size_t copied;
    size_t size = iov_size(l2hdr_iov, iovcnt);
    size_t proto_offset = l2hdr_len - sizeof(proto);

    if (size < proto_offset) {
        return ETH_P_UNKNOWN;
    }

    copied = iov_to_buf(l2hdr_iov, iovcnt, proto_offset,
                        &proto, sizeof(proto));

    return (copied == sizeof(proto)) ? be16_to_cpu(proto) : ETH_P_UNKNOWN;
}

static bool
_eth_copy_chunk(size_t input_size,
                const struct iovec *iov, int iovcnt,
                size_t offset, size_t length,
                void *buffer)
{
    size_t copied;

    if (input_size < offset) {
        return false;
    }

    copied = iov_to_buf(iov, iovcnt, offset, buffer, length);

    if (copied < length) {
        return false;
    }

    return true;
}

static bool
_eth_tcp_has_data(bool is_ip4,
                  const struct ip_header  *ip4_hdr,
                  const struct ip6_header *ip6_hdr,
                  size_t full_ip6hdr_len,
                  const struct tcp_header *tcp)
{
    uint32_t l4len;

    if (is_ip4) {
        l4len = be16_to_cpu(ip4_hdr->ip_len) - IP_HDR_GET_LEN(ip4_hdr);
    } else {
        size_t opts_len = full_ip6hdr_len - sizeof(struct ip6_header);
        l4len = be16_to_cpu(ip6_hdr->ip6_ctlun.ip6_un1.ip6_un1_plen) - opts_len;
    }

    return l4len > TCP_HEADER_DATA_OFFSET(tcp);
}

void eth_get_protocols(const struct iovec *iov, int iovcnt,
                       bool *isip4, bool *isip6,
                       bool *isudp, bool *istcp,
                       size_t *l3hdr_off,
                       size_t *l4hdr_off,
                       size_t *l5hdr_off,
                       eth_ip6_hdr_info *ip6hdr_info,
                       eth_ip4_hdr_info *ip4hdr_info,
                       eth_l4_hdr_info  *l4hdr_info)
{
    int proto;
    bool fragment = false;
    size_t l2hdr_len = eth_get_l2_hdr_length_iov(iov, iovcnt);
    size_t input_size = iov_size(iov, iovcnt);
    size_t copied;

    *isip4 = *isip6 = *isudp = *istcp = false;

    proto = eth_get_l3_proto(iov, iovcnt, l2hdr_len);

    *l3hdr_off = l2hdr_len;

    if (proto == ETH_P_IP) {
        struct ip_header *iphdr = &ip4hdr_info->ip4_hdr;

        if (input_size < l2hdr_len) {
            return;
        }

        copied = iov_to_buf(iov, iovcnt, l2hdr_len, iphdr, sizeof(*iphdr));

        *isip4 = true;

        if (copied < sizeof(*iphdr)) {
            return;
        }

        if (IP_HEADER_VERSION(iphdr) == IP_HEADER_VERSION_4) {
            if (iphdr->ip_p == IP_PROTO_TCP) {
                *istcp = true;
            } else if (iphdr->ip_p == IP_PROTO_UDP) {
                *isudp = true;
            }
        }

        ip4hdr_info->fragment = IP4_IS_FRAGMENT(iphdr);
        *l4hdr_off = l2hdr_len + IP_HDR_GET_LEN(iphdr);

        fragment = ip4hdr_info->fragment;
    } else if (proto == ETH_P_IPV6) {

        *isip6 = true;
        if (eth_parse_ipv6_hdr(iov, iovcnt, l2hdr_len,
                               ip6hdr_info)) {
            if (ip6hdr_info->l4proto == IP_PROTO_TCP) {
                *istcp = true;
            } else if (ip6hdr_info->l4proto == IP_PROTO_UDP) {
                *isudp = true;
            }
        } else {
            return;
        }

        *l4hdr_off = l2hdr_len + ip6hdr_info->full_hdr_len;
        fragment = ip6hdr_info->fragment;
    }

    if (!fragment) {
        if (*istcp) {
            *istcp = _eth_copy_chunk(input_size,
                                     iov, iovcnt,
                                     *l4hdr_off, sizeof(l4hdr_info->hdr.tcp),
                                     &l4hdr_info->hdr.tcp);

            if (*istcp) {
                *l5hdr_off = *l4hdr_off +
                    TCP_HEADER_DATA_OFFSET(&l4hdr_info->hdr.tcp);

                l4hdr_info->has_tcp_data =
                    _eth_tcp_has_data(proto == ETH_P_IP,
                                      &ip4hdr_info->ip4_hdr,
                                      &ip6hdr_info->ip6_hdr,
                                      *l4hdr_off - *l3hdr_off,
                                      &l4hdr_info->hdr.tcp);
            }
        } else if (*isudp) {
            *isudp = _eth_copy_chunk(input_size,
                                     iov, iovcnt,
                                     *l4hdr_off, sizeof(l4hdr_info->hdr.udp),
                                     &l4hdr_info->hdr.udp);
            *l5hdr_off = *l4hdr_off + sizeof(l4hdr_info->hdr.udp);
        }
    }
}

bool
eth_strip_vlan(const struct iovec *iov, int iovcnt, size_t iovoff,
               uint8_t *new_ehdr_buf,
               uint16_t *payload_offset, uint16_t *tci)
{
    struct vlan_header vlan_hdr;
    struct eth_header *new_ehdr = (struct eth_header *) new_ehdr_buf;

    size_t copied = iov_to_buf(iov, iovcnt, iovoff,
                               new_ehdr, sizeof(*new_ehdr));

    if (copied < sizeof(*new_ehdr)) {
        return false;
    }

    switch (be16_to_cpu(new_ehdr->h_proto)) {
    case ETH_P_VLAN:
    case ETH_P_DVLAN:
        copied = iov_to_buf(iov, iovcnt, iovoff + sizeof(*new_ehdr),
                            &vlan_hdr, sizeof(vlan_hdr));

        if (copied < sizeof(vlan_hdr)) {
            return false;
        }

        new_ehdr->h_proto = vlan_hdr.h_proto;

        *tci = be16_to_cpu(vlan_hdr.h_tci);
        *payload_offset = iovoff + sizeof(*new_ehdr) + sizeof(vlan_hdr);

        if (be16_to_cpu(new_ehdr->h_proto) == ETH_P_VLAN) {

            copied = iov_to_buf(iov, iovcnt, *payload_offset,
                                PKT_GET_VLAN_HDR(new_ehdr), sizeof(vlan_hdr));

            if (copied < sizeof(vlan_hdr)) {
                return false;
            }

            *payload_offset += sizeof(vlan_hdr);
        }
        return true;
    default:
        return false;
    }
}

bool
eth_strip_vlan_ex(const struct iovec *iov, int iovcnt, size_t iovoff,
                  uint16_t vet, uint8_t *new_ehdr_buf,
                  uint16_t *payload_offset, uint16_t *tci)
{
    struct vlan_header vlan_hdr;
    struct eth_header *new_ehdr = (struct eth_header *) new_ehdr_buf;

    size_t copied = iov_to_buf(iov, iovcnt, iovoff,
                               new_ehdr, sizeof(*new_ehdr));

    if (copied < sizeof(*new_ehdr)) {
        return false;
    }

    if (be16_to_cpu(new_ehdr->h_proto) == vet) {
        copied = iov_to_buf(iov, iovcnt, iovoff + sizeof(*new_ehdr),
                            &vlan_hdr, sizeof(vlan_hdr));

        if (copied < sizeof(vlan_hdr)) {
            return false;
        }

        new_ehdr->h_proto = vlan_hdr.h_proto;

        *tci = be16_to_cpu(vlan_hdr.h_tci);
        *payload_offset = iovoff + sizeof(*new_ehdr) + sizeof(vlan_hdr);
        return true;
    }

    return false;
}

void
eth_setup_ip4_fragmentation(const void *l2hdr, size_t l2hdr_len,
                            void *l3hdr, size_t l3hdr_len,
                            size_t l3payload_len,
                            size_t frag_offset, bool more_frags)
{
    const struct iovec l2vec = {
        .iov_base = (void *) l2hdr,
        .iov_len = l2hdr_len
    };

    if (eth_get_l3_proto(&l2vec, 1, l2hdr_len) == ETH_P_IP) {
        uint16_t orig_flags;
        struct ip_header *iphdr = (struct ip_header *) l3hdr;
        uint16_t frag_off_units = frag_offset / IP_FRAG_UNIT_SIZE;
        uint16_t new_ip_off;

        assert(frag_offset % IP_FRAG_UNIT_SIZE == 0);
        assert((frag_off_units & ~IP_OFFMASK) == 0);

        orig_flags = be16_to_cpu(iphdr->ip_off) & ~(IP_OFFMASK|IP_MF);
        new_ip_off = frag_off_units | orig_flags  | (more_frags ? IP_MF : 0);
        iphdr->ip_off = cpu_to_be16(new_ip_off);
        iphdr->ip_len = cpu_to_be16(l3payload_len + l3hdr_len);
    }
}

void
eth_fix_ip4_checksum(void *l3hdr, size_t l3hdr_len)
{
    struct ip_header *iphdr = (struct ip_header *) l3hdr;
    iphdr->ip_sum = 0;
    iphdr->ip_sum = cpu_to_be16(net_raw_checksum(l3hdr, l3hdr_len));
}

uint32_t
eth_calc_ip4_pseudo_hdr_csum(struct ip_header *iphdr,
                             uint16_t csl,
                             uint32_t *cso)
{
    struct ip_pseudo_header ipph;
    ipph.ip_src = iphdr->ip_src;
    ipph.ip_dst = iphdr->ip_dst;
    ipph.ip_payload = cpu_to_be16(csl);
    ipph.ip_proto = iphdr->ip_p;
    ipph.zeros = 0;
    *cso = sizeof(ipph);
    return net_checksum_add(*cso, (uint8_t *) &ipph);
}

uint32_t
eth_calc_ip6_pseudo_hdr_csum(struct ip6_header *iphdr,
                             uint16_t csl,
                             uint8_t l4_proto,
                             uint32_t *cso)
{
    struct ip6_pseudo_header ipph;
    ipph.ip6_src = iphdr->ip6_src;
    ipph.ip6_dst = iphdr->ip6_dst;
    ipph.len = cpu_to_be16(csl);
    ipph.zero[0] = 0;
    ipph.zero[1] = 0;
    ipph.zero[2] = 0;
    ipph.next_hdr = l4_proto;
    *cso = sizeof(ipph);
    return net_checksum_add(*cso, (uint8_t *)&ipph);
}

static bool
eth_is_ip6_extension_header_type(uint8_t hdr_type)
{
    switch (hdr_type) {
    case IP6_HOP_BY_HOP:
    case IP6_ROUTING:
    case IP6_FRAGMENT:
    case IP6_ESP:
    case IP6_AUTHENTICATION:
    case IP6_DESTINATON:
    case IP6_MOBILITY:
        return true;
    default:
        return false;
    }
}

static bool
_eth_get_rss_ex_dst_addr(const struct iovec *pkt, int pkt_frags,
                        size_t rthdr_offset,
                        struct ip6_ext_hdr *ext_hdr,
                        struct in6_address *dst_addr)
{
    struct ip6_ext_hdr_routing *rthdr = (struct ip6_ext_hdr_routing *) ext_hdr;

    if ((rthdr->rtype == 2) &&
        (rthdr->len == sizeof(struct in6_address) / 8) &&
        (rthdr->segleft == 1)) {

        size_t input_size = iov_size(pkt, pkt_frags);
        size_t bytes_read;

        if (input_size < rthdr_offset + sizeof(*ext_hdr)) {
            return false;
        }

        bytes_read = iov_to_buf(pkt, pkt_frags,
                                rthdr_offset + sizeof(*ext_hdr),
                                dst_addr, sizeof(*dst_addr));

        return bytes_read == sizeof(dst_addr);
    }

    return false;
}

static bool
_eth_get_rss_ex_src_addr(const struct iovec *pkt, int pkt_frags,
                        size_t dsthdr_offset,
                        struct ip6_ext_hdr *ext_hdr,
                        struct in6_address *src_addr)
{
    size_t bytes_left = (ext_hdr->ip6r_len + 1) * 8 - sizeof(*ext_hdr);
    struct ip6_option_hdr opthdr;
    size_t opt_offset = dsthdr_offset + sizeof(*ext_hdr);

    while (bytes_left > sizeof(opthdr)) {
        size_t input_size = iov_size(pkt, pkt_frags);
        size_t bytes_read, optlen;

        if (input_size < opt_offset) {
            return false;
        }

        bytes_read = iov_to_buf(pkt, pkt_frags, opt_offset,
                                &opthdr, sizeof(opthdr));

        if (bytes_read != sizeof(opthdr)) {
            return false;
        }

        optlen = (opthdr.type == IP6_OPT_PAD1) ? 1
                                               : (opthdr.len + sizeof(opthdr));

        if (optlen > bytes_left) {
            return false;
        }

        if (opthdr.type == IP6_OPT_HOME) {
            size_t input_size = iov_size(pkt, pkt_frags);

            if (input_size < opt_offset + sizeof(opthdr)) {
                return false;
            }

            bytes_read = iov_to_buf(pkt, pkt_frags,
                                    opt_offset + sizeof(opthdr),
                                    src_addr, sizeof(*src_addr));

            return bytes_read == sizeof(src_addr);
        }

        opt_offset += optlen;
        bytes_left -= optlen;
    }

    return false;
}

bool eth_parse_ipv6_hdr(const struct iovec *pkt, int pkt_frags,
                        size_t ip6hdr_off, eth_ip6_hdr_info *info)
{
    struct ip6_ext_hdr ext_hdr;
    size_t bytes_read;
    uint8_t curr_ext_hdr_type;
    size_t input_size = iov_size(pkt, pkt_frags);

    info->rss_ex_dst_valid = false;
    info->rss_ex_src_valid = false;
    info->fragment = false;

    if (input_size < ip6hdr_off) {
        return false;
    }

    bytes_read = iov_to_buf(pkt, pkt_frags, ip6hdr_off,
                            &info->ip6_hdr, sizeof(info->ip6_hdr));
    if (bytes_read < sizeof(info->ip6_hdr)) {
        return false;
    }

    info->full_hdr_len = sizeof(struct ip6_header);

    curr_ext_hdr_type = info->ip6_hdr.ip6_nxt;

    if (!eth_is_ip6_extension_header_type(curr_ext_hdr_type)) {
        info->l4proto = info->ip6_hdr.ip6_nxt;
        info->has_ext_hdrs = false;
        return true;
    }

    info->has_ext_hdrs = true;

    do {
        if (input_size < ip6hdr_off + info->full_hdr_len) {
            return false;
        }

        bytes_read = iov_to_buf(pkt, pkt_frags, ip6hdr_off + info->full_hdr_len,
                                &ext_hdr, sizeof(ext_hdr));

        if (bytes_read < sizeof(ext_hdr)) {
            return false;
        }

        if (curr_ext_hdr_type == IP6_ROUTING) {
            info->rss_ex_dst_valid =
                _eth_get_rss_ex_dst_addr(pkt, pkt_frags,
                                         ip6hdr_off + info->full_hdr_len,
                                         &ext_hdr, &info->rss_ex_dst);
        } else if (curr_ext_hdr_type == IP6_DESTINATON) {
            info->rss_ex_src_valid =
                _eth_get_rss_ex_src_addr(pkt, pkt_frags,
                                         ip6hdr_off + info->full_hdr_len,
                                         &ext_hdr, &info->rss_ex_src);
        } else if (curr_ext_hdr_type == IP6_FRAGMENT) {
            info->fragment = true;
        }

        info->full_hdr_len += (ext_hdr.ip6r_len + 1) * IP6_EXT_GRANULARITY;
        curr_ext_hdr_type = ext_hdr.ip6r_nxt;
    } while (eth_is_ip6_extension_header_type(curr_ext_hdr_type));

    info->l4proto = ext_hdr.ip6r_nxt;
    return true;
}
Commit	Line	Data
75020a70 DF	1	/*
	2	* QEMU network structures definitions and helper functions
	3	*
	4	* Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com)
	5	*
	6	* Developed by Daynix Computing LTD (http://www.daynix.com)
	7	*
	8	* Authors:
	9	* Dmitry Fleytman <[email protected]>
	10	* Tamir Shomer <[email protected]>
	11	* Yan Vugenfirer <[email protected]>
	12	*
	13	* This work is licensed under the terms of the GNU GPL, version 2 or later.
	14	* See the COPYING file in the top-level directory.
	15	*
	16	*/
	17
2744d920	18	#include "qemu/osdep.h"
75020a70 DF	19	#include "net/eth.h"
	20	#include "net/checksum.h"
	21	#include "qemu-common.h"
	22	#include "net/tap.h"
	23
eb700029 DF	24	void eth_setup_vlan_headers_ex(struct eth_header *ehdr, uint16_t vlan_tag,
eb700029 DF	25	uint16_t vlan_ethtype, bool *is_new)
75020a70 DF	26	{
	27	struct vlan_header *vhdr = PKT_GET_VLAN_HDR(ehdr);
	28
	29	switch (be16_to_cpu(ehdr->h_proto)) {
	30	case ETH_P_VLAN:
	31	case ETH_P_DVLAN:
	32	/* vlan hdr exists */
	33	*is_new = false;
	34	break;
	35
	36	default:
	37	/* No VLAN header, put a new one */
	38	vhdr->h_proto = ehdr->h_proto;
eb700029	39	ehdr->h_proto = cpu_to_be16(vlan_ethtype);
75020a70 DF	40	*is_new = true;
	41	break;
	42	}
	43	vhdr->h_tci = cpu_to_be16(vlan_tag);
	44	}
	45
	46	uint8_t
	47	eth_get_gso_type(uint16_t l3_proto, uint8_t *l3_hdr, uint8_t l4proto)
	48	{
	49	uint8_t ecn_state = 0;
	50
	51	if (l3_proto == ETH_P_IP) {
	52	struct ip_header iphdr = (struct ip_header ) l3_hdr;
	53
	54	if (IP_HEADER_VERSION(iphdr) == IP_HEADER_VERSION_4) {
	55	if (IPTOS_ECN(iphdr->ip_tos) == IPTOS_ECN_CE) {
	56	ecn_state = VIRTIO_NET_HDR_GSO_ECN;
	57	}
	58	if (l4proto == IP_PROTO_TCP) {
	59	return VIRTIO_NET_HDR_GSO_TCPV4 \| ecn_state;
	60	} else if (l4proto == IP_PROTO_UDP) {
	61	return VIRTIO_NET_HDR_GSO_UDP \| ecn_state;
	62	}
	63	}
	64	} else if (l3_proto == ETH_P_IPV6) {
	65	struct ip6_header ip6hdr = (struct ip6_header ) l3_hdr;
	66
	67	if (IP6_ECN(ip6hdr->ip6_ecn_acc) == IP6_ECN_CE) {
	68	ecn_state = VIRTIO_NET_HDR_GSO_ECN;
	69	}
	70
	71	if (l4proto == IP_PROTO_TCP) {
	72	return VIRTIO_NET_HDR_GSO_TCPV6 \| ecn_state;
	73	}
	74	}
	75
	76	/* Unsupported offload */
dfc6f865	77	g_assert_not_reached();
75020a70 DF	78
	79	return VIRTIO_NET_HDR_GSO_NONE \| ecn_state;
	80	}
	81
eb700029 DF	82	uint16_t
	83	eth_get_l3_proto(const struct iovec *l2hdr_iov, int iovcnt, size_t l2hdr_len)
	84	{
	85	uint16_t proto;
	86	size_t copied;
	87	size_t size = iov_size(l2hdr_iov, iovcnt);
	88	size_t proto_offset = l2hdr_len - sizeof(proto);
	89
	90	if (size < proto_offset) {
	91	return ETH_P_UNKNOWN;
	92	}
	93
	94	copied = iov_to_buf(l2hdr_iov, iovcnt, proto_offset,
	95	&proto, sizeof(proto));
	96
	97	return (copied == sizeof(proto)) ? be16_to_cpu(proto) : ETH_P_UNKNOWN;
	98	}
	99
	100	static bool
	101	_eth_copy_chunk(size_t input_size,
	102	const struct iovec *iov, int iovcnt,
	103	size_t offset, size_t length,
	104	void *buffer)
	105	{
	106	size_t copied;
	107
	108	if (input_size < offset) {
	109	return false;
	110	}
	111
	112	copied = iov_to_buf(iov, iovcnt, offset, buffer, length);
	113
	114	if (copied < length) {
	115	return false;
	116	}
	117
	118	return true;
	119	}
	120
	121	static bool
	122	_eth_tcp_has_data(bool is_ip4,
	123	const struct ip_header *ip4_hdr,
	124	const struct ip6_header *ip6_hdr,
	125	size_t full_ip6hdr_len,
	126	const struct tcp_header *tcp)
	127	{
	128	uint32_t l4len;
	129
	130	if (is_ip4) {
	131	l4len = be16_to_cpu(ip4_hdr->ip_len) - IP_HDR_GET_LEN(ip4_hdr);
	132	} else {
	133	size_t opts_len = full_ip6hdr_len - sizeof(struct ip6_header);
	134	l4len = be16_to_cpu(ip6_hdr->ip6_ctlun.ip6_un1.ip6_un1_plen) - opts_len;
	135	}
	136
	137	return l4len > TCP_HEADER_DATA_OFFSET(tcp);
	138	}
	139
	140	void eth_get_protocols(const struct iovec *iov, int iovcnt,
75020a70	141	bool isip4, bool isip6,
eb700029 DF	142	bool isudp, bool istcp,
	143	size_t *l3hdr_off,
	144	size_t *l4hdr_off,
	145	size_t *l5hdr_off,
	146	eth_ip6_hdr_info *ip6hdr_info,
	147	eth_ip4_hdr_info *ip4hdr_info,
	148	eth_l4_hdr_info *l4hdr_info)
75020a70 DF	149	{
75020a70 DF	150	int proto;
eb700029 DF	151	bool fragment = false;
	152	size_t l2hdr_len = eth_get_l2_hdr_length_iov(iov, iovcnt);
	153	size_t input_size = iov_size(iov, iovcnt);
	154	size_t copied;
	155
75020a70 DF	156	isip4 = isip6 = isudp = istcp = false;
75020a70 DF	157
eb700029 DF	158	proto = eth_get_l3_proto(iov, iovcnt, l2hdr_len);
	159
	160	*l3hdr_off = l2hdr_len;
	161
75020a70	162	if (proto == ETH_P_IP) {
eb700029	163	struct ip_header *iphdr = &ip4hdr_info->ip4_hdr;
75020a70	164
eb700029 DF	165	if (input_size < l2hdr_len) {
	166	return;
	167	}
	168
	169	copied = iov_to_buf(iov, iovcnt, l2hdr_len, iphdr, sizeof(*iphdr));
75020a70	170
eb700029	171	*isip4 = true;
75020a70	172
eb700029 DF	173	if (copied < sizeof(*iphdr)) {
	174	return;
	175	}
75020a70 DF	176
	177	if (IP_HEADER_VERSION(iphdr) == IP_HEADER_VERSION_4) {
	178	if (iphdr->ip_p == IP_PROTO_TCP) {
	179	*istcp = true;
	180	} else if (iphdr->ip_p == IP_PROTO_UDP) {
	181	*isudp = true;
	182	}
	183	}
75020a70	184
eb700029 DF	185	ip4hdr_info->fragment = IP4_IS_FRAGMENT(iphdr);
	186	*l4hdr_off = l2hdr_len + IP_HDR_GET_LEN(iphdr);
	187
	188	fragment = ip4hdr_info->fragment;
	189	} else if (proto == ETH_P_IPV6) {
75020a70 DF	190
75020a70 DF	191	*isip6 = true;
eb700029 DF	192	if (eth_parse_ipv6_hdr(iov, iovcnt, l2hdr_len,
	193	ip6hdr_info)) {
	194	if (ip6hdr_info->l4proto == IP_PROTO_TCP) {
75020a70	195	*istcp = true;
eb700029	196	} else if (ip6hdr_info->l4proto == IP_PROTO_UDP) {
75020a70 DF	197	*isudp = true;
75020a70 DF	198	}
eb700029 DF	199	} else {
	200	return;
	201	}
	202
	203	*l4hdr_off = l2hdr_len + ip6hdr_info->full_hdr_len;
	204	fragment = ip6hdr_info->fragment;
	205	}
	206
	207	if (!fragment) {
	208	if (*istcp) {
	209	*istcp = _eth_copy_chunk(input_size,
	210	iov, iovcnt,
	211	*l4hdr_off, sizeof(l4hdr_info->hdr.tcp),
	212	&l4hdr_info->hdr.tcp);
	213
2c5e564f	214	if (*istcp) {
eb700029 DF	215	l5hdr_off = l4hdr_off +
	216	TCP_HEADER_DATA_OFFSET(&l4hdr_info->hdr.tcp);
	217
	218	l4hdr_info->has_tcp_data =
	219	_eth_tcp_has_data(proto == ETH_P_IP,
	220	&ip4hdr_info->ip4_hdr,
	221	&ip6hdr_info->ip6_hdr,
	222	l4hdr_off - l3hdr_off,
	223	&l4hdr_info->hdr.tcp);
	224	}
	225	} else if (*isudp) {
	226	*isudp = _eth_copy_chunk(input_size,
	227	iov, iovcnt,
	228	*l4hdr_off, sizeof(l4hdr_info->hdr.udp),
	229	&l4hdr_info->hdr.udp);
	230	l5hdr_off = l4hdr_off + sizeof(l4hdr_info->hdr.udp);
	231	}
	232	}
	233	}
	234
	235	bool
	236	eth_strip_vlan(const struct iovec *iov, int iovcnt, size_t iovoff,
	237	uint8_t *new_ehdr_buf,
	238	uint16_t payload_offset, uint16_t tci)
	239	{
	240	struct vlan_header vlan_hdr;
	241	struct eth_header new_ehdr = (struct eth_header ) new_ehdr_buf;
	242
	243	size_t copied = iov_to_buf(iov, iovcnt, iovoff,
	244	new_ehdr, sizeof(*new_ehdr));
	245
	246	if (copied < sizeof(*new_ehdr)) {
	247	return false;
	248	}
	249
	250	switch (be16_to_cpu(new_ehdr->h_proto)) {
	251	case ETH_P_VLAN:
	252	case ETH_P_DVLAN:
	253	copied = iov_to_buf(iov, iovcnt, iovoff + sizeof(*new_ehdr),
	254	&vlan_hdr, sizeof(vlan_hdr));
	255
	256	if (copied < sizeof(vlan_hdr)) {
	257	return false;
	258	}
	259
	260	new_ehdr->h_proto = vlan_hdr.h_proto;
	261
	262	*tci = be16_to_cpu(vlan_hdr.h_tci);
	263	payload_offset = iovoff + sizeof(new_ehdr) + sizeof(vlan_hdr);
	264
	265	if (be16_to_cpu(new_ehdr->h_proto) == ETH_P_VLAN) {
	266
	267	copied = iov_to_buf(iov, iovcnt, *payload_offset,
	268	PKT_GET_VLAN_HDR(new_ehdr), sizeof(vlan_hdr));
	269
	270	if (copied < sizeof(vlan_hdr)) {
	271	return false;
	272	}
	273
	274	*payload_offset += sizeof(vlan_hdr);
	275	}
	276	return true;
	277	default:
	278	return false;
279	}
280	}
281
282	bool
283	eth_strip_vlan_ex(const struct iovec *iov, int iovcnt, size_t iovoff,
284	uint16_t vet, uint8_t *new_ehdr_buf,
285	uint16_t payload_offset, uint16_t tci)
286	{
287	struct vlan_header vlan_hdr;
288	struct eth_header new_ehdr = (struct eth_header ) new_ehdr_buf;
289
290	size_t copied = iov_to_buf(iov, iovcnt, iovoff,
291	new_ehdr, sizeof(*new_ehdr));
292
293	if (copied < sizeof(*new_ehdr)) {
294	return false;
295	}
296
297	if (be16_to_cpu(new_ehdr->h_proto) == vet) {
298	copied = iov_to_buf(iov, iovcnt, iovoff + sizeof(*new_ehdr),
299	&vlan_hdr, sizeof(vlan_hdr));
300
301	if (copied < sizeof(vlan_hdr)) {
302	return false;
75020a70	303	}
eb700029 DF	304
	305	new_ehdr->h_proto = vlan_hdr.h_proto;
	306
	307	*tci = be16_to_cpu(vlan_hdr.h_tci);
	308	payload_offset = iovoff + sizeof(new_ehdr) + sizeof(vlan_hdr);
	309	return true;
75020a70	310	}
eb700029 DF	311
eb700029 DF	312	return false;
75020a70 DF	313	}
	314
	315	void
	316	eth_setup_ip4_fragmentation(const void *l2hdr, size_t l2hdr_len,
	317	void *l3hdr, size_t l3hdr_len,
	318	size_t l3payload_len,
	319	size_t frag_offset, bool more_frags)
	320	{
eb700029 DF	321	const struct iovec l2vec = {
	322	.iov_base = (void *) l2hdr,
	323	.iov_len = l2hdr_len
	324	};
	325
	326	if (eth_get_l3_proto(&l2vec, 1, l2hdr_len) == ETH_P_IP) {
75020a70 DF	327	uint16_t orig_flags;
	328	struct ip_header iphdr = (struct ip_header ) l3hdr;
	329	uint16_t frag_off_units = frag_offset / IP_FRAG_UNIT_SIZE;
	330	uint16_t new_ip_off;
	331
	332	assert(frag_offset % IP_FRAG_UNIT_SIZE == 0);
	333	assert((frag_off_units & ~IP_OFFMASK) == 0);
	334
	335	orig_flags = be16_to_cpu(iphdr->ip_off) & ~(IP_OFFMASK\|IP_MF);
	336	new_ip_off = frag_off_units \| orig_flags \| (more_frags ? IP_MF : 0);
	337	iphdr->ip_off = cpu_to_be16(new_ip_off);
	338	iphdr->ip_len = cpu_to_be16(l3payload_len + l3hdr_len);
	339	}
	340	}
	341
	342	void
	343	eth_fix_ip4_checksum(void *l3hdr, size_t l3hdr_len)
	344	{
	345	struct ip_header iphdr = (struct ip_header ) l3hdr;
	346	iphdr->ip_sum = 0;
	347	iphdr->ip_sum = cpu_to_be16(net_raw_checksum(l3hdr, l3hdr_len));
	348	}
	349
	350	uint32_t
eb700029 DF	351	eth_calc_ip4_pseudo_hdr_csum(struct ip_header *iphdr,
	352	uint16_t csl,
	353	uint32_t *cso)
75020a70 DF	354	{
	355	struct ip_pseudo_header ipph;
	356	ipph.ip_src = iphdr->ip_src;
	357	ipph.ip_dst = iphdr->ip_dst;
	358	ipph.ip_payload = cpu_to_be16(csl);
	359	ipph.ip_proto = iphdr->ip_p;
	360	ipph.zeros = 0;
eb700029 DF	361	*cso = sizeof(ipph);
	362	return net_checksum_add(cso, (uint8_t ) &ipph);
	363	}
	364
	365	uint32_t
	366	eth_calc_ip6_pseudo_hdr_csum(struct ip6_header *iphdr,
	367	uint16_t csl,
	368	uint8_t l4_proto,
	369	uint32_t *cso)
	370	{
	371	struct ip6_pseudo_header ipph;
	372	ipph.ip6_src = iphdr->ip6_src;
	373	ipph.ip6_dst = iphdr->ip6_dst;
	374	ipph.len = cpu_to_be16(csl);
	375	ipph.zero[0] = 0;
	376	ipph.zero[1] = 0;
	377	ipph.zero[2] = 0;
	378	ipph.next_hdr = l4_proto;
	379	*cso = sizeof(ipph);
	380	return net_checksum_add(cso, (uint8_t )&ipph);
75020a70 DF	381	}
	382
	383	static bool
	384	eth_is_ip6_extension_header_type(uint8_t hdr_type)
	385	{
	386	switch (hdr_type) {
	387	case IP6_HOP_BY_HOP:
	388	case IP6_ROUTING:
	389	case IP6_FRAGMENT:
	390	case IP6_ESP:
	391	case IP6_AUTHENTICATION:
	392	case IP6_DESTINATON:
	393	case IP6_MOBILITY:
	394	return true;
	395	default:
	396	return false;
	397	}
	398	}
	399
eb700029 DF	400	static bool
	401	_eth_get_rss_ex_dst_addr(const struct iovec *pkt, int pkt_frags,
	402	size_t rthdr_offset,
	403	struct ip6_ext_hdr *ext_hdr,
	404	struct in6_address *dst_addr)
	405	{
	406	struct ip6_ext_hdr_routing rthdr = (struct ip6_ext_hdr_routing ) ext_hdr;
	407
	408	if ((rthdr->rtype == 2) &&
	409	(rthdr->len == sizeof(struct in6_address) / 8) &&
	410	(rthdr->segleft == 1)) {
	411
	412	size_t input_size = iov_size(pkt, pkt_frags);
	413	size_t bytes_read;
	414
	415	if (input_size < rthdr_offset + sizeof(*ext_hdr)) {
	416	return false;
	417	}
	418
	419	bytes_read = iov_to_buf(pkt, pkt_frags,
	420	rthdr_offset + sizeof(*ext_hdr),
4555ca68	421	dst_addr, sizeof(*dst_addr));
eb700029 DF	422
	423	return bytes_read == sizeof(dst_addr);
	424	}
	425
	426	return false;
	427	}
	428
	429	static bool
	430	_eth_get_rss_ex_src_addr(const struct iovec *pkt, int pkt_frags,
	431	size_t dsthdr_offset,
	432	struct ip6_ext_hdr *ext_hdr,
	433	struct in6_address *src_addr)
	434	{
	435	size_t bytes_left = (ext_hdr->ip6r_len + 1) * 8 - sizeof(*ext_hdr);
	436	struct ip6_option_hdr opthdr;
	437	size_t opt_offset = dsthdr_offset + sizeof(*ext_hdr);
	438
	439	while (bytes_left > sizeof(opthdr)) {
	440	size_t input_size = iov_size(pkt, pkt_frags);
	441	size_t bytes_read, optlen;
	442
	443	if (input_size < opt_offset) {
	444	return false;
	445	}
	446
	447	bytes_read = iov_to_buf(pkt, pkt_frags, opt_offset,
	448	&opthdr, sizeof(opthdr));
	449
	450	if (bytes_read != sizeof(opthdr)) {
	451	return false;
	452	}
	453
	454	optlen = (opthdr.type == IP6_OPT_PAD1) ? 1
	455	: (opthdr.len + sizeof(opthdr));
	456
	457	if (optlen > bytes_left) {
	458	return false;
	459	}
	460
	461	if (opthdr.type == IP6_OPT_HOME) {
	462	size_t input_size = iov_size(pkt, pkt_frags);
	463
	464	if (input_size < opt_offset + sizeof(opthdr)) {
	465	return false;
	466	}
	467
	468	bytes_read = iov_to_buf(pkt, pkt_frags,
	469	opt_offset + sizeof(opthdr),
4555ca68	470	src_addr, sizeof(*src_addr));
eb700029 DF	471
	472	return bytes_read == sizeof(src_addr);
	473	}
	474
	475	opt_offset += optlen;
	476	bytes_left -= optlen;
	477	}
	478
	479	return false;
	480	}
	481
	482	bool eth_parse_ipv6_hdr(const struct iovec *pkt, int pkt_frags,
	483	size_t ip6hdr_off, eth_ip6_hdr_info *info)
75020a70	484	{
75020a70 DF	485	struct ip6_ext_hdr ext_hdr;
75020a70 DF	486	size_t bytes_read;
eb700029 DF	487	uint8_t curr_ext_hdr_type;
	488	size_t input_size = iov_size(pkt, pkt_frags);
	489
	490	info->rss_ex_dst_valid = false;
	491	info->rss_ex_src_valid = false;
	492	info->fragment = false;
	493
	494	if (input_size < ip6hdr_off) {
	495	return false;
	496	}
75020a70 DF	497
75020a70 DF	498	bytes_read = iov_to_buf(pkt, pkt_frags, ip6hdr_off,
eb700029 DF	499	&info->ip6_hdr, sizeof(info->ip6_hdr));
eb700029 DF	500	if (bytes_read < sizeof(info->ip6_hdr)) {
75020a70 DF	501	return false;
	502	}
	503
eb700029 DF	504	info->full_hdr_len = sizeof(struct ip6_header);
	505
	506	curr_ext_hdr_type = info->ip6_hdr.ip6_nxt;
75020a70	507
eb700029 DF	508	if (!eth_is_ip6_extension_header_type(curr_ext_hdr_type)) {
	509	info->l4proto = info->ip6_hdr.ip6_nxt;
	510	info->has_ext_hdrs = false;
75020a70 DF	511	return true;
	512	}
	513
eb700029 DF	514	info->has_ext_hdrs = true;
eb700029 DF	515
75020a70	516	do {
eb700029 DF	517	if (input_size < ip6hdr_off + info->full_hdr_len) {
	518	return false;
	519	}
	520
	521	bytes_read = iov_to_buf(pkt, pkt_frags, ip6hdr_off + info->full_hdr_len,
75020a70	522	&ext_hdr, sizeof(ext_hdr));
75020a70	523
eb700029 DF	524	if (bytes_read < sizeof(ext_hdr)) {
	525	return false;
	526	}
	527
	528	if (curr_ext_hdr_type == IP6_ROUTING) {
	529	info->rss_ex_dst_valid =
	530	_eth_get_rss_ex_dst_addr(pkt, pkt_frags,
	531	ip6hdr_off + info->full_hdr_len,
	532	&ext_hdr, &info->rss_ex_dst);
	533	} else if (curr_ext_hdr_type == IP6_DESTINATON) {
	534	info->rss_ex_src_valid =
	535	_eth_get_rss_ex_src_addr(pkt, pkt_frags,
	536	ip6hdr_off + info->full_hdr_len,
	537	&ext_hdr, &info->rss_ex_src);
	538	} else if (curr_ext_hdr_type == IP6_FRAGMENT) {
	539	info->fragment = true;
	540	}
	541
	542	info->full_hdr_len += (ext_hdr.ip6r_len + 1) * IP6_EXT_GRANULARITY;
	543	curr_ext_hdr_type = ext_hdr.ip6r_nxt;
	544	} while (eth_is_ip6_extension_header_type(curr_ext_hdr_type));
	545
	546	info->l4proto = ext_hdr.ip6r_nxt;
75020a70 DF	547	return true;
75020a70 DF	548	}