464 lines
12 KiB
C
464 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _NET_FLOW_DISSECTOR_H
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#define _NET_FLOW_DISSECTOR_H
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#include <linux/types.h>
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#include <linux/in6.h>
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#include <linux/siphash.h>
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#include <linux/string.h>
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#include <uapi/linux/if_ether.h>
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struct bpf_prog;
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struct net;
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struct sk_buff;
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/**
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* struct flow_dissector_key_control:
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* @thoff: Transport header offset
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* @addr_type: Type of key. One of FLOW_DISSECTOR_KEY_*
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* @flags: Key flags. Any of FLOW_DIS_(IS_FRAGMENT|FIRST_FRAGENCAPSULATION)
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*/
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struct flow_dissector_key_control {
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u16 thoff;
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u16 addr_type;
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u32 flags;
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};
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#define FLOW_DIS_IS_FRAGMENT BIT(0)
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#define FLOW_DIS_FIRST_FRAG BIT(1)
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#define FLOW_DIS_ENCAPSULATION BIT(2)
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enum flow_dissect_ret {
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FLOW_DISSECT_RET_OUT_GOOD,
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FLOW_DISSECT_RET_OUT_BAD,
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FLOW_DISSECT_RET_PROTO_AGAIN,
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FLOW_DISSECT_RET_IPPROTO_AGAIN,
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FLOW_DISSECT_RET_CONTINUE,
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};
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/**
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* struct flow_dissector_key_basic:
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* @n_proto: Network header protocol (eg. IPv4/IPv6)
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* @ip_proto: Transport header protocol (eg. TCP/UDP)
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* @padding: Unused
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*/
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struct flow_dissector_key_basic {
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__be16 n_proto;
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u8 ip_proto;
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u8 padding;
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};
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struct flow_dissector_key_tags {
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u32 flow_label;
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};
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struct flow_dissector_key_vlan {
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union {
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struct {
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u16 vlan_id:12,
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vlan_dei:1,
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vlan_priority:3;
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};
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__be16 vlan_tci;
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};
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__be16 vlan_tpid;
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__be16 vlan_eth_type;
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u16 padding;
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};
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struct flow_dissector_mpls_lse {
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u32 mpls_ttl:8,
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mpls_bos:1,
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mpls_tc:3,
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mpls_label:20;
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};
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#define FLOW_DIS_MPLS_MAX 7
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struct flow_dissector_key_mpls {
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struct flow_dissector_mpls_lse ls[FLOW_DIS_MPLS_MAX]; /* Label Stack */
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u8 used_lses; /* One bit set for each Label Stack Entry in use */
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};
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static inline void dissector_set_mpls_lse(struct flow_dissector_key_mpls *mpls,
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int lse_index)
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{
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mpls->used_lses |= 1 << lse_index;
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}
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#define FLOW_DIS_TUN_OPTS_MAX 255
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/**
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* struct flow_dissector_key_enc_opts:
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* @data: tunnel option data
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* @len: length of tunnel option data
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* @dst_opt_type: tunnel option type
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*/
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struct flow_dissector_key_enc_opts {
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u8 data[FLOW_DIS_TUN_OPTS_MAX]; /* Using IP_TUNNEL_OPTS_MAX is desired
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* here but seems difficult to #include
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*/
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u8 len;
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__be16 dst_opt_type;
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};
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struct flow_dissector_key_keyid {
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__be32 keyid;
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};
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/**
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* struct flow_dissector_key_ipv4_addrs:
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* @src: source ip address
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* @dst: destination ip address
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*/
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struct flow_dissector_key_ipv4_addrs {
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/* (src,dst) must be grouped, in the same way than in IP header */
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__be32 src;
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__be32 dst;
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};
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/**
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* struct flow_dissector_key_ipv6_addrs:
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* @src: source ip address
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* @dst: destination ip address
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*/
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struct flow_dissector_key_ipv6_addrs {
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/* (src,dst) must be grouped, in the same way than in IP header */
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struct in6_addr src;
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struct in6_addr dst;
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};
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/**
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* struct flow_dissector_key_tipc:
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* @key: source node address combined with selector
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*/
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struct flow_dissector_key_tipc {
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__be32 key;
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};
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/**
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* struct flow_dissector_key_addrs:
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* @v4addrs: IPv4 addresses
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* @v6addrs: IPv6 addresses
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* @tipckey: TIPC key
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*/
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struct flow_dissector_key_addrs {
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union {
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struct flow_dissector_key_ipv4_addrs v4addrs;
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struct flow_dissector_key_ipv6_addrs v6addrs;
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struct flow_dissector_key_tipc tipckey;
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};
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};
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/**
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* struct flow_dissector_key_arp:
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* @sip: Sender IP address
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* @tip: Target IP address
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* @op: Operation
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* @sha: Sender hardware address
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* @tha: Target hardware address
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*/
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struct flow_dissector_key_arp {
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__u32 sip;
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__u32 tip;
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__u8 op;
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unsigned char sha[ETH_ALEN];
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unsigned char tha[ETH_ALEN];
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};
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/**
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* struct flow_dissector_key_ports:
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* @ports: port numbers of Transport header
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* @src: source port number
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* @dst: destination port number
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*/
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struct flow_dissector_key_ports {
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union {
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__be32 ports;
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struct {
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__be16 src;
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__be16 dst;
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};
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};
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};
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/**
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* struct flow_dissector_key_ports_range
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* @tp: port number from packet
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* @tp_min: min port number in range
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* @tp_max: max port number in range
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*/
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struct flow_dissector_key_ports_range {
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union {
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struct flow_dissector_key_ports tp;
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struct {
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struct flow_dissector_key_ports tp_min;
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struct flow_dissector_key_ports tp_max;
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};
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};
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};
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/**
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* struct flow_dissector_key_icmp:
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* @type: ICMP type
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* @code: ICMP code
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* @id: Session identifier
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*/
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struct flow_dissector_key_icmp {
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struct {
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u8 type;
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u8 code;
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};
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u16 id;
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};
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/**
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* struct flow_dissector_key_eth_addrs:
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* @src: source Ethernet address
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* @dst: destination Ethernet address
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*/
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struct flow_dissector_key_eth_addrs {
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/* (dst,src) must be grouped, in the same way than in ETH header */
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unsigned char dst[ETH_ALEN];
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unsigned char src[ETH_ALEN];
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};
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/**
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* struct flow_dissector_key_tcp:
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* @flags: flags
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*/
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struct flow_dissector_key_tcp {
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__be16 flags;
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};
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/**
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* struct flow_dissector_key_ip:
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* @tos: tos
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* @ttl: ttl
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*/
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struct flow_dissector_key_ip {
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__u8 tos;
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__u8 ttl;
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};
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/**
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* struct flow_dissector_key_meta:
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* @ingress_ifindex: ingress ifindex
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* @ingress_iftype: ingress interface type
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* @l2_miss: packet did not match an L2 entry during forwarding
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*/
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struct flow_dissector_key_meta {
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int ingress_ifindex;
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u16 ingress_iftype;
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u8 l2_miss;
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};
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/**
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* struct flow_dissector_key_ct:
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* @ct_state: conntrack state after converting with map
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* @ct_mark: conttrack mark
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* @ct_zone: conntrack zone
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* @ct_labels: conntrack labels
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*/
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struct flow_dissector_key_ct {
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u16 ct_state;
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u16 ct_zone;
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u32 ct_mark;
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u32 ct_labels[4];
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};
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/**
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* struct flow_dissector_key_hash:
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* @hash: hash value
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*/
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struct flow_dissector_key_hash {
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u32 hash;
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};
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/**
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* struct flow_dissector_key_num_of_vlans:
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* @num_of_vlans: num_of_vlans value
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*/
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struct flow_dissector_key_num_of_vlans {
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u8 num_of_vlans;
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};
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/**
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* struct flow_dissector_key_pppoe:
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* @session_id: pppoe session id
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* @ppp_proto: ppp protocol
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* @type: pppoe eth type
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*/
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struct flow_dissector_key_pppoe {
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__be16 session_id;
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__be16 ppp_proto;
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__be16 type;
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};
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/**
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* struct flow_dissector_key_l2tpv3:
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* @session_id: identifier for a l2tp session
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*/
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struct flow_dissector_key_l2tpv3 {
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__be32 session_id;
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};
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/**
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* struct flow_dissector_key_cfm
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* @mdl_ver: maintenance domain level (mdl) and cfm protocol version
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* @opcode: code specifying a type of cfm protocol packet
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*
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* See 802.1ag, ITU-T G.8013/Y.1731
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* 1 2
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* |7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0|
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | mdl | version | opcode |
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* +-----+---------+-+-+-+-+-+-+-+-+
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*/
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struct flow_dissector_key_cfm {
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u8 mdl_ver;
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u8 opcode;
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};
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#define FLOW_DIS_CFM_MDL_MASK GENMASK(7, 5)
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#define FLOW_DIS_CFM_MDL_MAX 7
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enum flow_dissector_key_id {
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FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */
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FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
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FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */
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FLOW_DISSECTOR_KEY_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
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FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
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FLOW_DISSECTOR_KEY_PORTS_RANGE, /* struct flow_dissector_key_ports */
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FLOW_DISSECTOR_KEY_ICMP, /* struct flow_dissector_key_icmp */
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FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
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FLOW_DISSECTOR_KEY_TIPC, /* struct flow_dissector_key_tipc */
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FLOW_DISSECTOR_KEY_ARP, /* struct flow_dissector_key_arp */
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FLOW_DISSECTOR_KEY_VLAN, /* struct flow_dissector_key_vlan */
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FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_tags */
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FLOW_DISSECTOR_KEY_GRE_KEYID, /* struct flow_dissector_key_keyid */
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FLOW_DISSECTOR_KEY_MPLS_ENTROPY, /* struct flow_dissector_key_keyid */
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FLOW_DISSECTOR_KEY_ENC_KEYID, /* struct flow_dissector_key_keyid */
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FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */
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FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
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FLOW_DISSECTOR_KEY_ENC_CONTROL, /* struct flow_dissector_key_control */
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FLOW_DISSECTOR_KEY_ENC_PORTS, /* struct flow_dissector_key_ports */
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FLOW_DISSECTOR_KEY_MPLS, /* struct flow_dissector_key_mpls */
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FLOW_DISSECTOR_KEY_TCP, /* struct flow_dissector_key_tcp */
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FLOW_DISSECTOR_KEY_IP, /* struct flow_dissector_key_ip */
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FLOW_DISSECTOR_KEY_CVLAN, /* struct flow_dissector_key_vlan */
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FLOW_DISSECTOR_KEY_ENC_IP, /* struct flow_dissector_key_ip */
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FLOW_DISSECTOR_KEY_ENC_OPTS, /* struct flow_dissector_key_enc_opts */
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FLOW_DISSECTOR_KEY_META, /* struct flow_dissector_key_meta */
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FLOW_DISSECTOR_KEY_CT, /* struct flow_dissector_key_ct */
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FLOW_DISSECTOR_KEY_HASH, /* struct flow_dissector_key_hash */
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FLOW_DISSECTOR_KEY_NUM_OF_VLANS, /* struct flow_dissector_key_num_of_vlans */
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FLOW_DISSECTOR_KEY_PPPOE, /* struct flow_dissector_key_pppoe */
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FLOW_DISSECTOR_KEY_L2TPV3, /* struct flow_dissector_key_l2tpv3 */
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FLOW_DISSECTOR_KEY_CFM, /* struct flow_dissector_key_cfm */
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FLOW_DISSECTOR_KEY_MAX,
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};
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#define FLOW_DISSECTOR_F_PARSE_1ST_FRAG BIT(0)
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#define FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL BIT(1)
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#define FLOW_DISSECTOR_F_STOP_AT_ENCAP BIT(2)
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#define FLOW_DISSECTOR_F_STOP_BEFORE_ENCAP BIT(3)
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struct flow_dissector_key {
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enum flow_dissector_key_id key_id;
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size_t offset; /* offset of struct flow_dissector_key_*
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in target the struct */
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};
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struct flow_dissector {
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unsigned int used_keys; /* each bit repesents presence of one key id */
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unsigned short int offset[FLOW_DISSECTOR_KEY_MAX];
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};
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struct flow_keys_basic {
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struct flow_dissector_key_control control;
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struct flow_dissector_key_basic basic;
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};
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struct flow_keys {
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struct flow_dissector_key_control control;
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#define FLOW_KEYS_HASH_START_FIELD basic
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struct flow_dissector_key_basic basic __aligned(SIPHASH_ALIGNMENT);
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struct flow_dissector_key_tags tags;
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struct flow_dissector_key_vlan vlan;
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struct flow_dissector_key_vlan cvlan;
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struct flow_dissector_key_keyid keyid;
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struct flow_dissector_key_ports ports;
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struct flow_dissector_key_icmp icmp;
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/* 'addrs' must be the last member */
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struct flow_dissector_key_addrs addrs;
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};
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#define FLOW_KEYS_HASH_OFFSET \
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offsetof(struct flow_keys, FLOW_KEYS_HASH_START_FIELD)
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__be32 flow_get_u32_src(const struct flow_keys *flow);
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__be32 flow_get_u32_dst(const struct flow_keys *flow);
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extern struct flow_dissector flow_keys_dissector;
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extern struct flow_dissector flow_keys_basic_dissector;
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/* struct flow_keys_digest:
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*
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* This structure is used to hold a digest of the full flow keys. This is a
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* larger "hash" of a flow to allow definitively matching specific flows where
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* the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so
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* that it can be used in CB of skb (see sch_choke for an example).
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*/
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#define FLOW_KEYS_DIGEST_LEN 16
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struct flow_keys_digest {
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u8 data[FLOW_KEYS_DIGEST_LEN];
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};
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void make_flow_keys_digest(struct flow_keys_digest *digest,
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const struct flow_keys *flow);
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static inline bool flow_keys_have_l4(const struct flow_keys *keys)
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{
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return (keys->ports.ports || keys->tags.flow_label);
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}
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u32 flow_hash_from_keys(struct flow_keys *keys);
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void skb_flow_get_icmp_tci(const struct sk_buff *skb,
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struct flow_dissector_key_icmp *key_icmp,
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const void *data, int thoff, int hlen);
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static inline bool dissector_uses_key(const struct flow_dissector *flow_dissector,
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enum flow_dissector_key_id key_id)
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{
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return flow_dissector->used_keys & (1 << key_id);
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}
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static inline void *skb_flow_dissector_target(struct flow_dissector *flow_dissector,
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enum flow_dissector_key_id key_id,
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void *target_container)
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{
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return ((char *)target_container) + flow_dissector->offset[key_id];
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}
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struct bpf_flow_dissector {
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struct bpf_flow_keys *flow_keys;
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const struct sk_buff *skb;
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const void *data;
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const void *data_end;
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};
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static inline void
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flow_dissector_init_keys(struct flow_dissector_key_control *key_control,
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struct flow_dissector_key_basic *key_basic)
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{
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memset(key_control, 0, sizeof(*key_control));
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memset(key_basic, 0, sizeof(*key_basic));
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}
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#ifdef CONFIG_BPF_SYSCALL
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int flow_dissector_bpf_prog_attach_check(struct net *net,
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struct bpf_prog *prog);
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#endif /* CONFIG_BPF_SYSCALL */
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#endif
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