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passt: Introduce packet batching mechanism

Browse source 
Receive packets in batches from AF_UNIX, check if they can be sent
with a single syscall, and batch them up with sendmmsg() in case.

A bit rudimentary, currently only implemented for UDP, but it seems
to work.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-04-22 13:39:36 +02:00
commit 1f7cf04d34
8 changed files with 337 additions and 122 deletions

31
icmp.c
View file

@ -77,45 +77,54 @@ void icmp_sock_handler(struct ctx *c, int s, uint32_t events)
* icmp_tap_handler() - Handle packets from tap
* @c: Execution context
* @af: Address family, AF_INET or AF_INET6
* @in: Input buffer
* @len: Length, including UDP header
* @msg: Input message
* @count: Message count (always 1 for ICMP)
*
* Return: count of consumed packets (always 1, even if malformed)
*/
void icmp_tap_handler(struct ctx *c, int af, void *addr, char *in, size_t len)
int icmp_tap_handler(struct ctx *c, int af, void *addr,
struct tap_msg *msg, int count)
{
(void)count;
if (af == AF_INET) {
struct icmphdr *ih = (struct icmphdr *)in;
struct icmphdr *ih = (struct icmphdr *)msg[0].l4h;
struct sockaddr_in sa = {
.sin_family = AF_INET,
.sin_addr.s_addr = htonl(INADDR_ANY),
};
if (len < sizeof(*ih) || ih->type != ICMP_ECHO)
return;
if (msg[0].l4_len < sizeof(*ih) || ih->type != ICMP_ECHO)
return 1;
sa.sin_port = ih->un.echo.id;
bind(c->icmp.s4, (struct sockaddr *)&sa, sizeof(sa));
sa.sin_addr = *(struct in_addr *)addr;
sendto(c->icmp.s4, in, len, MSG_DONTWAIT,
sendto(c->icmp.s4, msg[0].l4h, msg[0].l4_len,
MSG_DONTWAIT | MSG_NOSIGNAL,
(struct sockaddr *)&sa, sizeof(sa));
} else if (af == AF_INET6) {
struct sockaddr_in6 sa = {
.sin6_family = AF_INET6,
.sin6_addr = IN6ADDR_ANY_INIT,
};
struct icmp6hdr *ih = (struct icmp6hdr *)in;
struct icmp6hdr *ih = (struct icmp6hdr *)msg[0].l4h;
if (len < sizeof(*ih) ||
if (msg[0].l4_len < sizeof(*ih) ||
(ih->icmp6_type != 128 && ih->icmp6_type != 129))
return;
return 1;
sa.sin6_port = ih->icmp6_identifier;
bind(c->icmp.s6, (struct sockaddr *)&sa, sizeof(sa));
sa.sin6_addr = *(struct in6_addr *)addr;
sendto(c->icmp.s6, in, len, MSG_DONTWAIT | MSG_NOSIGNAL,
sendto(c->icmp.s6, msg[0].l4h, msg[0].l4_len,
MSG_DONTWAIT | MSG_NOSIGNAL,
(struct sockaddr *)&sa, sizeof(sa));
}
return 1;
}
/**