2021-03-18 07:49:08 +01:00
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void err(const char *format, ...);
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void warn(const char *format, ...);
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void info(const char *format, ...);
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#ifdef DEBUG
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void debug(const char *format, ...);
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#else
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#define debug(...) { }
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#endif
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2020-07-20 16:27:43 +02:00
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uint16_t csum_fold(uint32_t sum);
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uint16_t csum_ip4(void *buf, size_t len);
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passt: New design and implementation with native Layer 4 sockets
This is a reimplementation, partially building on the earlier draft,
that uses L4 sockets (SOCK_DGRAM, SOCK_STREAM) instead of SOCK_RAW,
providing L4-L2 translation functionality without requiring any
security capability.
Conceptually, this follows the design presented at:
https://gitlab.com/abologna/kubevirt-and-kvm/-/blob/master/Networking.md
The most significant novelty here comes from TCP and UDP translation
layers. In particular, the TCP state and translation logic follows
the intent of being minimalistic, without reimplementing a full TCP
stack in either direction, and synchronising as much as possible the
TCP dynamic and flows between guest and host kernel.
Another important introduction concerns addressing, port translation
and forwarding. The Layer 4 implementations now attempt to bind on
all unbound ports, in order to forward connections in a transparent
way.
While at it:
- the qemu 'tap' back-end can't be used as-is by qrap anymore,
because of explicit checks now introduced in qemu to ensure that
the corresponding file descriptor is actually a tap device. For
this reason, qrap now operates on a 'socket' back-end type,
accounting for and building the additional header reporting
frame length
- provide a demo script that sets up namespaces, addresses and
routes, and starts the daemon. A virtual machine started in the
network namespace, wrapped by qrap, will now directly interface
with passt and communicate using Layer 4 sockets provided by the
host kernel.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2021-02-16 07:25:09 +01:00
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void csum_tcp4(struct iphdr *iph);
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char *ipv6_l4hdr(struct ipv6hdr *ip6h, uint8_t *proto);
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int sock_l4_add(struct ctx *c, int v, uint16_t proto, uint16_t port);
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int timespec_diff_ms(struct timespec *a, struct timespec *b);
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