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34fb381b5a
In some places (well, actually only UDP now) we use struct tap_hdr to represent both tap backend specific and L2 ethernet headers. Handling these together seemed like a good idea at the time, but Laurent's changes in the TCP code working towards vhost-user support suggest that treating them separately is more useful, more often. Alter struct tap_hdr to represent only the TAP backend specific headers. Updated related helpers and the UDP code to match. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright (c) 2021 Red Hat GmbH
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* Author: Stefano Brivio <sbrivio@redhat.com>
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*/
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#ifndef TAP_H
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#define TAP_H
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#define ETH_HDR_INIT(proto) { .h_proto = htons_constant(proto) }
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/**
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* struct tap_hdr - tap backend specific headers
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* @vnet_len: Frame length (for qemu socket transport)
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*/
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struct tap_hdr {
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uint32_t vnet_len;
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} __attribute__((packed));
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static inline size_t tap_hdr_len_(const struct ctx *c)
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{
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if (c->mode == MODE_PASST)
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return sizeof(struct tap_hdr);
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else
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return 0;
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}
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/**
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* tap_frame_base() - Find start of tap frame
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* @c: Execution context
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* @taph: Pointer to tap specific header buffer
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*
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* Returns: pointer to the start of tap frame - suitable for an
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* iov_base to be passed to tap_send_frames())
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*/
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static inline void *tap_frame_base(const struct ctx *c, struct tap_hdr *taph)
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{
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return (char *)(taph + 1) - tap_hdr_len_(c);
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}
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/**
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* tap_frame_len() - Finalize tap frame and return total length
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* @c: Execution context
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* @taph: Tap header to finalize
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* @plen: L2 packet length (includes L2, excludes tap specific headers)
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*
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* Returns: length of the tap frame including tap specific headers - suitable
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* for an iov_len to be passed to tap_send_frames()
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*/
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static inline size_t tap_frame_len(const struct ctx *c, struct tap_hdr *taph,
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size_t plen)
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{
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if (c->mode == MODE_PASST)
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taph->vnet_len = htonl(plen);
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return plen + tap_hdr_len_(c);
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}
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struct in_addr tap_ip4_daddr(const struct ctx *c);
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void tap_udp4_send(const struct ctx *c, struct in_addr src, in_port_t sport,
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struct in_addr dst, in_port_t dport,
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const void *in, size_t len);
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void tap_icmp4_send(const struct ctx *c, struct in_addr src, struct in_addr dst,
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const void *in, size_t len);
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const struct in6_addr *tap_ip6_daddr(const struct ctx *c,
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const struct in6_addr *src);
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void tap_udp6_send(const struct ctx *c,
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const struct in6_addr *src, in_port_t sport,
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const struct in6_addr *dst, in_port_t dport,
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uint32_t flow, const void *in, size_t len);
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void tap_icmp6_send(const struct ctx *c,
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const struct in6_addr *src, const struct in6_addr *dst,
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const void *in, size_t len);
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void tap_send_single(const struct ctx *c, const void *data, size_t len);
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size_t tap_send_frames(const struct ctx *c, const struct iovec *iov,
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size_t bufs_per_frame, size_t nframes);
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void eth_update_mac(struct ethhdr *eh,
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const unsigned char *eth_d, const unsigned char *eth_s);
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void tap_listen_handler(struct ctx *c, uint32_t events);
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void tap_handler_pasta(struct ctx *c, uint32_t events,
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const struct timespec *now);
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void tap_handler_passt(struct ctx *c, uint32_t events,
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const struct timespec *now);
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void tap_sock_init(struct ctx *c);
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#endif /* TAP_H */
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