From b439984641edaf4e781dc424d4c8a574461d3540 Mon Sep 17 00:00:00 2001 From: Stefano Brivio Date: Mon, 20 Jul 2020 16:27:43 +0200 Subject: merd: ARP and DHCP handlers, connection tracking fixes With this, merd provides a fully functional IPv4 environment to guests, requiring a single capability, CAP_NET_RAW. Signed-off-by: Stefano Brivio --- merd.h | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 merd.h (limited to 'merd.h') diff --git a/merd.h b/merd.h new file mode 100644 index 0000000..78e3c0b --- /dev/null +++ b/merd.h @@ -0,0 +1,47 @@ +#define CT_SIZE 4096 +#define UNIX_SOCK_PATH "/tmp/merd.socket" + +/** + * struct ct4 - IPv4 connection tracking entry + * @p: IANA protocol number + * @sa: Source address (as seen from tap interface) + * @da: Destination address + * @sp: Source port, network order + * @dp: Destination port, network order + * @hd: Destination MAC address + * @hs: Source MAC address + * @fd: File descriptor for corresponding AF_INET socket + */ +struct ct4 { + uint8_t p; + uint32_t sa; + uint32_t da; + uint16_t sp; + uint16_t dp; + unsigned char hd[ETH_ALEN]; + unsigned char hs[ETH_ALEN]; + int fd; +}; + +/** + * struct ctx - Execution context + * @epollfd: file descriptor for epoll instance + * @fd_unix: AF_UNIX socket for tap file descriptor + * @map4: Connection tracking table + * @addr4: IPv4 address for external, routable interface + * @mask4: IPv4 netmask, network order + * @gw4: Default IPv4 gateway, network order + * @dns4: IPv4 DNS address, network order + * @ifn: Name of routable interface + */ +struct ctx { + int epollfd; + int fd_unix; + struct ct4 map4[CT_SIZE]; + unsigned char mac[ETH_ALEN]; + unsigned long addr4; + unsigned long mask4; + unsigned long gw4; + unsigned long dns4; + char ifn[IF_NAMESIZE]; +}; -- cgit v1.2.3