38b50dba47
Avoid a bunch of syscalls on forwarding paths by: - storing minimum and maximum file descriptor numbers for each protocol, fall back to SO_PROTOCOL query only on overlaps - allocating a larger receive buffer -- this can result in more coalesced packets than sendmmsg() can take (UIO_MAXIOV, i.e. 1024), so make sure we don't exceed that within a single call to protocol tap handlers - nesting the handling loop in tap_handler() in the receive loop, so that we have better chances of filling our receive buffer in fewer calls - skipping the recvfrom() in the UDP handler on EPOLLERR -- there's nothing to be done in that case and while at it: - restore the 20ms timer interval for periodic (TCP) events, I accidentally changed that to 100ms in an earlier commit - attempt using SO_ZEROCOPY for UDP -- if it's not available, sendmmsg() will succeed anyway - fix the handling of the status code from sendmmsg(), if it fails, we'll try to discard the first message, hence return 1 from the UDP handler Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
#define UNIX_SOCK_PATH "/tmp/passt.socket"
|
|
|
|
/**
|
|
* struct tap_msg - Generic message descriptor for arrays of messages
|
|
* @start: Pointer to message start
|
|
* @l4_start: Pointer to L4 header
|
|
* @len: Message length, with L2 headers
|
|
* @l4_len: Message length, with L4 headers
|
|
*/
|
|
struct tap_msg {
|
|
char *start;
|
|
char *l4h;
|
|
size_t len;
|
|
size_t l4_len;
|
|
};
|
|
|
|
#include "icmp.h"
|
|
#include "tcp.h"
|
|
#include "udp.h"
|
|
|
|
/**
|
|
* struct ctx - Execution context
|
|
* @epollfd: file descriptor for epoll instance
|
|
* @fd_unix: AF_UNIX socket for tap file descriptor
|
|
* @v4: Enable IPv4 transport
|
|
* @mac: Host MAC address
|
|
* @mac_guest: Guest MAC address
|
|
* @addr4: IPv4 address for external, routable interface
|
|
* @mask4: IPv4 netmask, network order
|
|
* @gw4: Default IPv4 gateway, network order
|
|
* @dns4: IPv4 DNS address, network order
|
|
* @v6: Enable IPv6 transport
|
|
* @addr6: IPv6 address for external, routable interface
|
|
* @gw6: Default IPv6 gateway
|
|
* @dns4: IPv6 DNS address
|
|
* @ifn: Name of routable interface
|
|
*/
|
|
struct ctx {
|
|
int epollfd;
|
|
int fd_unix;
|
|
unsigned char mac[ETH_ALEN];
|
|
unsigned char mac_guest[ETH_ALEN];
|
|
|
|
int v4;
|
|
unsigned long addr4;
|
|
unsigned long mask4;
|
|
unsigned long gw4;
|
|
unsigned long dns4;
|
|
|
|
int v6;
|
|
struct in6_addr addr6;
|
|
struct in6_addr addr6_guest;
|
|
struct in6_addr gw6;
|
|
struct in6_addr dns6;
|
|
|
|
char ifn[IF_NAMESIZE];
|
|
|
|
struct icmp_ctx icmp;
|
|
struct tcp_ctx tcp;
|
|
struct tcp_ctx udp;
|
|
};
|