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Split tap_ip_send() into IPv4 and IPv6 specific functions

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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>
This commit is contained in:
David Gibson
2022-10-19 11:43:52 +11:00
committed by Stefano Brivio
parent fb5d1c5d7d
commit f616ca231e
4 changed files with 101 additions and 94 deletions
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6
tap.h
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@@ -9,8 +9,10 @@
in_addr_t tap_ip4_daddr(const struct ctx *c);
const struct in6_addr *tap_ip6_daddr(const struct ctx *c,
const struct in6_addr *src);
void tap_ip_send(const struct ctx *c, const struct in6_addr *src, uint8_t proto,
const char *in, size_t len, uint32_t flow);
void tap_ip4_send(const struct ctx *c, in_addr_t src, uint8_t proto,
const char *in, size_t len);
void tap_ip6_send(const struct ctx *c, const struct in6_addr *src,
uint8_t proto, const char *in, size_t len, uint32_t flow);
int tap_send(const struct ctx *c, const void *data, size_t len);
void tap_handler(struct ctx *c, int fd, uint32_t events,
const struct timespec *now);