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https://passt.top/passt
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64a0ba3b27
Packets are received directly onto pre-cooked, static buffers for IPv4 (with partial checksum pre-calculation) and IPv6 frames, with pre-filled Ethernet addresses and, partially, IP headers, and sent out from the same buffers with sendmmsg(), for both passt and pasta (non-local traffic only) modes. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
#define UNIX_SOCK_MAX 100
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#define UNIX_SOCK_PATH "/tmp/passt_%i.socket"
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/**
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* struct tap_msg - Generic message descriptor for arrays of messages
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* @start: Pointer to message start
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* @l4_start: Pointer to L4 header
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* @len: Message length, with L2 headers
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* @l4_len: Message length, with L4 headers
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*/
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struct tap_msg {
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char *start;
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char *l4h;
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size_t len;
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size_t l4_len;
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};
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union epoll_ref;
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#include "icmp.h"
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#include "tcp.h"
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#include "udp.h"
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/**
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* union epoll_ref - Breakdown of reference for epoll socket bookkeeping
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* @proto: IP protocol number
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* @s: Socket number (implies 2^24 limit on number of descriptors)
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* @tcp: TCP-specific reference part
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* @udp: UDP-specific reference part
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* @icmp: ICMP-specific reference part
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* @data: Data handled by protocol handlers
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* @u64: Opaque reference for epoll_ctl() and epoll_wait()
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*/
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union epoll_ref {
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struct {
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uint32_t proto:8,
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s:24;
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union {
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union tcp_epoll_ref tcp;
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union udp_epoll_ref udp;
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union icmp_epoll_ref icmp;
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uint32_t data;
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};
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};
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uint64_t u64;
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};
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#define TAP_BUF_BYTES (ETH_MAX_MTU * 3)
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#define TAP_BUF_FILL (TAP_BUF_BYTES - ETH_MAX_MTU - sizeof(uint32_t))
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#define TAP_MSGS (TAP_BUF_BYTES / sizeof(struct ethhdr) + 1)
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#define PKT_BUF_BYTES MAX(TAP_BUF_BYTES, 0)
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extern char pkt_buf [PKT_BUF_BYTES];
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#ifdef DEBUG
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extern char *ip_proto_str[];
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#define IP_PROTO_STR(n) \
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(((n) <= IPPROTO_SCTP && ip_proto_str[(n)]) ? ip_proto_str[(n)] : "?")
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#endif
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#include <resolv.h> /* For MAXNS below */
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/**
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* struct fqdn - Representation of fully-qualified domain name
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* @n: Domain name string
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*/
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struct fqdn {
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char n[NS_MAXDNAME];
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};
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#include <net/if.h>
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enum passt_modes {
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MODE_PASST,
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MODE_PASTA,
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};
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/**
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* struct ctx - Execution context
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* @mode: Operation mode, qemu/UNIX domain socket or namespace/tap
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* @pasta_pid: Target PID of namespace for pasta mode
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* @epollfd: File descriptor for epoll instance
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* @fd_tap_listen: File descriptor for listening AF_UNIX socket, if any
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* @fd_tap: File descriptor for AF_UNIX socket or tuntap device
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* @mac: Host MAC address
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* @mac_guest: Guest MAC address
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* @v4: Enable IPv4 transport
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* @addr4: IPv4 address for external, routable interface
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* @addr4_seen: Latest IPv4 address seen as source from tap
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* @mask4: IPv4 netmask, network order
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* @gw4: Default IPv4 gateway, network order
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* @dns4: IPv4 DNS addresses, zero-terminated, network order
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* @dns_search: DNS search list
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* @v6: Enable IPv6 transport
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* @addr6: IPv6 address for external, routable interface
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* @addr6_seen: Latest IPv6 global/site address seen as source from tap
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* @addr6_ll_seen: Latest IPv6 link-local address seen as source from tap
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* @gw6: Default IPv6 gateway
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* @dns4: IPv4 DNS addresses, zero-terminated
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* @ifn: Name of routable interface
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* @tcp: Context for TCP protocol handler
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* @udp: Context for UDP protocol handler
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* @icmp: Context for ICMP protocol handler
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*/
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struct ctx {
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enum passt_modes mode;
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int pasta_pid;
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int epollfd;
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int fd_tap_listen;
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int fd_tap;
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unsigned char mac[ETH_ALEN];
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unsigned char mac_guest[ETH_ALEN];
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int v4;
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uint32_t addr4;
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uint32_t addr4_seen;
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uint32_t mask4;
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uint32_t gw4;
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uint32_t dns4[MAXNS + 1];
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struct fqdn dns_search[MAXDNSRCH];
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int v6;
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struct in6_addr addr6;
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struct in6_addr addr6_seen;
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struct in6_addr addr6_ll_seen;
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struct in6_addr gw6;
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struct in6_addr dns6[MAXNS + 1];
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char ifn[IF_NAMESIZE];
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struct tcp_ctx tcp;
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struct udp_ctx udp;
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struct icmp_ctx icmp;
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};
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void proto_update_l2_buf(unsigned char *eth_d, unsigned char *eth_s,
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uint32_t *ip_da);
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