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bpf: sockmap sample program

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This program binds a program to a cgroup and then matches hard
coded IP addresses and adds these to a sockmap.

This will receive messages from the backend and send them to
the client.

     client:X <---> frontend:10000 client:X <---> backend:10001

To keep things simple this is only designed for 1:1 connections
using hard coded values. A more complete example would allow many
backends and clients.

To run,

 # sockmap <cgroup2_dir>

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Fastabend
2017-08-15 22:33:32 -07:00
committed by David S. Miller
parent 8a31db5615
commit 69e8cc134b
8 changed files with 547 additions and 6 deletions
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46
tools/include/uapi/linux/bpf.h
View File

@@ -110,6 +110,7 @@ enum bpf_map_type {
BPF_MAP_TYPE_ARRAY_OF_MAPS,
BPF_MAP_TYPE_HASH_OF_MAPS,
BPF_MAP_TYPE_DEVMAP,
BPF_MAP_TYPE_SOCKMAP,
};
enum bpf_prog_type {
@@ -127,6 +128,7 @@ enum bpf_prog_type {
BPF_PROG_TYPE_LWT_OUT,
BPF_PROG_TYPE_LWT_XMIT,
BPF_PROG_TYPE_SOCK_OPS,
BPF_PROG_TYPE_SK_SKB,
};
enum bpf_attach_type {
@@ -134,11 +136,18 @@ enum bpf_attach_type {
BPF_CGROUP_INET_EGRESS,
BPF_CGROUP_INET_SOCK_CREATE,
BPF_CGROUP_SOCK_OPS,
BPF_CGROUP_SMAP_INGRESS,
__MAX_BPF_ATTACH_TYPE
};
#define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE
enum bpf_sockmap_flags {
BPF_SOCKMAP_UNSPEC,
BPF_SOCKMAP_STRPARSER,
__MAX_BPF_SOCKMAP_FLAG
};
/* If BPF_F_ALLOW_OVERRIDE flag is used in BPF_PROG_ATTACH command
* to the given target_fd cgroup the descendent cgroup will be able to
* override effective bpf program that was inherited from this cgroup
@@ -210,6 +219,7 @@ union bpf_attr {
__u32 attach_bpf_fd; /* eBPF program to attach */
__u32 attach_type;
__u32 attach_flags;
__u32 attach_bpf_fd2;
};
struct { /* anonymous struct used by BPF_PROG_TEST_RUN command */
@@ -545,6 +555,23 @@ union bpf_attr {
* @mode: operation mode (enum bpf_adj_room_mode)
* @flags: reserved for future use
* Return: 0 on success or negative error code
*
* int bpf_sk_redirect_map(map, key, flags)
* Redirect skb to a sock in map using key as a lookup key for the
* sock in map.
* @map: pointer to sockmap
* @key: key to lookup sock in map
* @flags: reserved for future use
* Return: SK_REDIRECT
*
* int bpf_sock_map_update(skops, map, key, flags, map_flags)
* @skops: pointer to bpf_sock_ops
* @map: pointer to sockmap to update
* @key: key to insert/update sock in map
* @flags: same flags as map update elem
* @map_flags: sock map specific flags
* bit 1: Enable strparser
* other bits: reserved
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@@ -598,7 +625,9 @@ union bpf_attr {
FN(set_hash), \
FN(setsockopt), \
FN(skb_adjust_room), \
FN(redirect_map),
FN(redirect_map), \
FN(sk_redirect_map), \
FN(sock_map_update),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call
@@ -675,6 +704,15 @@ struct __sk_buff {
__u32 data;
__u32 data_end;
__u32 napi_id;
/* accessed by BPF_PROG_TYPE_sk_skb types */
__u32 family;
__u32 remote_ip4; /* Stored in network byte order */
__u32 local_ip4; /* Stored in network byte order */
__u32 remote_ip6[4]; /* Stored in network byte order */
__u32 local_ip6[4]; /* Stored in network byte order */
__u32 remote_port; /* Stored in network byte order */
__u32 local_port; /* stored in host byte order */
};
struct bpf_tunnel_key {
@@ -734,6 +772,12 @@ struct xdp_md {
__u32 data_end;
};
enum sk_action {
SK_ABORTED = 0,
SK_DROP,
SK_REDIRECT,
};
#define BPF_TAG_SIZE 8
struct bpf_prog_info {