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f616ca231e
The IPv4 and IPv6 paths in tap_ip_send() have very little in common, and
it turns out that every caller (statically) knows if it is using IPv4 or
IPv6. So split into separate tap_ip4_send() and tap_ip6_send() functions.
Use a new tap_l2_hdr() function for the very small common part.
While we're there, make some minor cleanups:
- We were double writing some fields in the IPv6 header, so that it
temporary matched the pseudo-header for checksum calculation. With
recent checksum reworks, this isn't neccessary any more.
- We don't use any IPv4 header options, so use some sizeof() constructs
instead of some open coded values for header length.
- The comment used to say that the flow label was for TCP over IPv6, but
in fact the only thing we used it for was DHCPv6 over UDP traffic
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
22 lines
745 B
C
22 lines
745 B
C
/* SPDX-License-Identifier: AGPL-3.0-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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in_addr_t tap_ip4_daddr(const struct ctx *c);
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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_ip4_send(const struct ctx *c, in_addr_t src, uint8_t proto,
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const char *in, size_t len);
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void tap_ip6_send(const struct ctx *c, const struct in6_addr *src,
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uint8_t proto, const char *in, size_t len, uint32_t flow);
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int tap_send(const struct ctx *c, const void *data, size_t len);
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void tap_handler(struct ctx *c, int fd, 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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