8dc4194474
This patch is needed to make ISC's DHCP server (and probably other DHCP servers/clients using AF_PACKET) to be able to serve another client on the same Xen host. The problem is that packets between different domains on the same Xen host only have partial checksums. Unfortunately this piece of information is not passed along in AF_PACKET unless you're using the mmap interface. Since dhcpd doesn't support packet-mmap, UDP packets from the same host come out with apparently bogus checksums. This patch adds a mechanism for AF_PACKET recvmsg(2) to return the status along with the packet. It does so by adding a new cmsg that contains this information along with some other relevant data such as the original packet length. I didn't include the time stamp information since there is already a cmsg for that. This patch also changes the mmap code to set the CSUMNOTREADY flag on all packets instead of just outoing packets on cooked sockets. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
#ifndef __LINUX_IF_PACKET_H
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#define __LINUX_IF_PACKET_H
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#include <linux/types.h>
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struct sockaddr_pkt
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{
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unsigned short spkt_family;
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unsigned char spkt_device[14];
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__be16 spkt_protocol;
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};
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struct sockaddr_ll
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{
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unsigned short sll_family;
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__be16 sll_protocol;
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int sll_ifindex;
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unsigned short sll_hatype;
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unsigned char sll_pkttype;
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unsigned char sll_halen;
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unsigned char sll_addr[8];
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};
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/* Packet types */
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#define PACKET_HOST 0 /* To us */
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#define PACKET_BROADCAST 1 /* To all */
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#define PACKET_MULTICAST 2 /* To group */
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#define PACKET_OTHERHOST 3 /* To someone else */
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#define PACKET_OUTGOING 4 /* Outgoing of any type */
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/* These ones are invisible by user level */
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#define PACKET_LOOPBACK 5 /* MC/BRD frame looped back */
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#define PACKET_FASTROUTE 6 /* Fastrouted frame */
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/* Packet socket options */
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#define PACKET_ADD_MEMBERSHIP 1
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#define PACKET_DROP_MEMBERSHIP 2
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#define PACKET_RECV_OUTPUT 3
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/* Value 4 is still used by obsolete turbo-packet. */
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#define PACKET_RX_RING 5
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#define PACKET_STATISTICS 6
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#define PACKET_COPY_THRESH 7
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#define PACKET_AUXDATA 8
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struct tpacket_stats
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{
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unsigned int tp_packets;
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unsigned int tp_drops;
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};
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struct tpacket_auxdata
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{
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__u32 tp_status;
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__u32 tp_len;
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__u32 tp_snaplen;
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__u16 tp_mac;
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__u16 tp_net;
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};
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struct tpacket_hdr
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{
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unsigned long tp_status;
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#define TP_STATUS_KERNEL 0
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#define TP_STATUS_USER 1
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#define TP_STATUS_COPY 2
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#define TP_STATUS_LOSING 4
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#define TP_STATUS_CSUMNOTREADY 8
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unsigned int tp_len;
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unsigned int tp_snaplen;
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unsigned short tp_mac;
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unsigned short tp_net;
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unsigned int tp_sec;
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unsigned int tp_usec;
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};
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#define TPACKET_ALIGNMENT 16
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#define TPACKET_ALIGN(x) (((x)+TPACKET_ALIGNMENT-1)&~(TPACKET_ALIGNMENT-1))
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#define TPACKET_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll))
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/*
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Frame structure:
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- Start. Frame must be aligned to TPACKET_ALIGNMENT=16
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- struct tpacket_hdr
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- pad to TPACKET_ALIGNMENT=16
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- struct sockaddr_ll
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- Gap, chosen so that packet data (Start+tp_net) alignes to TPACKET_ALIGNMENT=16
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- Start+tp_mac: [ Optional MAC header ]
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- Start+tp_net: Packet data, aligned to TPACKET_ALIGNMENT=16.
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- Pad to align to TPACKET_ALIGNMENT=16
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*/
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struct tpacket_req
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{
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unsigned int tp_block_size; /* Minimal size of contiguous block */
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unsigned int tp_block_nr; /* Number of blocks */
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unsigned int tp_frame_size; /* Size of frame */
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unsigned int tp_frame_nr; /* Total number of frames */
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};
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struct packet_mreq
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{
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int mr_ifindex;
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unsigned short mr_type;
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unsigned short mr_alen;
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unsigned char mr_address[8];
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};
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#define PACKET_MR_MULTICAST 0
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#define PACKET_MR_PROMISC 1
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#define PACKET_MR_ALLMULTI 2
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#endif
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