include/uapi/linux/bpf.h

   1 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
   2  *
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of version 2 of the GNU General Public
   5  * License as published by the Free Software Foundation.
   6  */
   7 #ifndef _UAPI__LINUX_BPF_H__
   8 #define _UAPI__LINUX_BPF_H__
   9
  10 #include <linux/types.h>
  11 #include <linux/bpf_common.h>
  12
  13 /* Extended instruction set based on top of classic BPF */
  14
  15 /* instruction classes */
  16 #define BPF_ALU64       0x07    /* alu mode in double word width */
  17
  18 /* ld/ldx fields */
  19 #define BPF_DW          0x18    /* double word */
  20 #define BPF_XADD        0xc0    /* exclusive add */
  21
  22 /* alu/jmp fields */
  23 #define BPF_MOV         0xb0    /* mov reg to reg */
  24 #define BPF_ARSH        0xc0    /* sign extending arithmetic shift right */
  25
  26 /* change endianness of a register */
  27 #define BPF_END         0xd0    /* flags for endianness conversion: */
  28 #define BPF_TO_LE       0x00    /* convert to little-endian */
  29 #define BPF_TO_BE       0x08    /* convert to big-endian */
  30 #define BPF_FROM_LE     BPF_TO_LE
  31 #define BPF_FROM_BE     BPF_TO_BE
  32
  33 #define BPF_JNE         0x50    /* jump != */
  34 #define BPF_JSGT        0x60    /* SGT is signed '>', GT in x86 */
  35 #define BPF_JSGE        0x70    /* SGE is signed '>=', GE in x86 */
  36 #define BPF_CALL        0x80    /* function call */
  37 #define BPF_EXIT        0x90    /* function return */
  38
  39 /* Register numbers */
  40 enum {
  41         BPF_REG_0 = 0,
  42         BPF_REG_1,
  43         BPF_REG_2,
  44         BPF_REG_3,
  45         BPF_REG_4,
  46         BPF_REG_5,
  47         BPF_REG_6,
  48         BPF_REG_7,
  49         BPF_REG_8,
  50         BPF_REG_9,
  51         BPF_REG_10,
  52         __MAX_BPF_REG,
  53 };
  54
  55 /* BPF has 10 general purpose 64-bit registers and stack frame. */
  56 #define MAX_BPF_REG     __MAX_BPF_REG
  57
  58 struct bpf_insn {
  59         __u8    code;           /* opcode */
  60         __u8    dst_reg:4;      /* dest register */
  61         __u8    src_reg:4;      /* source register */
  62         __s16   off;            /* signed offset */
  63         __s32   imm;            /* signed immediate constant */
  64 };
  65
  66 /* BPF syscall commands, see bpf(2) man-page for details. */
  67 enum bpf_cmd {
  68         BPF_MAP_CREATE,
  69         BPF_MAP_LOOKUP_ELEM,
  70         BPF_MAP_UPDATE_ELEM,
  71         BPF_MAP_DELETE_ELEM,
  72         BPF_MAP_GET_NEXT_KEY,
  73         BPF_PROG_LOAD,
  74         BPF_OBJ_PIN,
  75         BPF_OBJ_GET,
  76 };
  77
  78 enum bpf_map_type {
  79         BPF_MAP_TYPE_UNSPEC,
  80         BPF_MAP_TYPE_HASH,
  81         BPF_MAP_TYPE_ARRAY,
  82         BPF_MAP_TYPE_PROG_ARRAY,
  83         BPF_MAP_TYPE_PERF_EVENT_ARRAY,
  84 };
  85
  86 enum bpf_prog_type {
  87         BPF_PROG_TYPE_UNSPEC,
  88         BPF_PROG_TYPE_SOCKET_FILTER,
  89         BPF_PROG_TYPE_KPROBE,
  90         BPF_PROG_TYPE_SCHED_CLS,
  91         BPF_PROG_TYPE_SCHED_ACT,
  92 };
  93
  94 #define BPF_PSEUDO_MAP_FD       1
  95
  96 /* flags for BPF_MAP_UPDATE_ELEM command */
  97 #define BPF_ANY         0 /* create new element or update existing */
  98 #define BPF_NOEXIST     1 /* create new element if it didn't exist */
  99 #define BPF_EXIST       2 /* update existing element */
 100
 101 union bpf_attr {
 102         struct { /* anonymous struct used by BPF_MAP_CREATE command */
 103                 __u32   map_type;       /* one of enum bpf_map_type */
 104                 __u32   key_size;       /* size of key in bytes */
 105                 __u32   value_size;     /* size of value in bytes */
 106                 __u32   max_entries;    /* max number of entries in a map */
 107         };
 108
 109         struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */
 110                 __u32           map_fd;
 111                 __aligned_u64   key;
 112                 union {
 113                         __aligned_u64 value;
 114                         __aligned_u64 next_key;
 115                 };
 116                 __u64           flags;
 117         };
 118
 119         struct { /* anonymous struct used by BPF_PROG_LOAD command */
 120                 __u32           prog_type;      /* one of enum bpf_prog_type */
 121                 __u32           insn_cnt;
 122                 __aligned_u64   insns;
 123                 __aligned_u64   license;
 124                 __u32           log_level;      /* verbosity level of verifier */
 125                 __u32           log_size;       /* size of user buffer */
 126                 __aligned_u64   log_buf;        /* user supplied buffer */
 127                 __u32           kern_version;   /* checked when prog_type=kprobe */
 128         };
 129
 130         struct { /* anonymous struct used by BPF_OBJ_* commands */
 131                 __aligned_u64   pathname;
 132                 __u32           bpf_fd;
 133         };
 134 } __attribute__((aligned(8)));
 135
 136 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
 137  * function eBPF program intends to call
 138  */
 139 enum bpf_func_id {
 140         BPF_FUNC_unspec,
 141         BPF_FUNC_map_lookup_elem, /* void *map_lookup_elem(&map, &key) */
 142         BPF_FUNC_map_update_elem, /* int map_update_elem(&map, &key, &value, flags) */
 143         BPF_FUNC_map_delete_elem, /* int map_delete_elem(&map, &key) */
 144         BPF_FUNC_probe_read,      /* int bpf_probe_read(void *dst, int size, void *src) */
 145         BPF_FUNC_ktime_get_ns,    /* u64 bpf_ktime_get_ns(void) */
 146         BPF_FUNC_trace_printk,    /* int bpf_trace_printk(const char *fmt, int fmt_size, ...) */
 147         BPF_FUNC_get_prandom_u32, /* u32 prandom_u32(void) */
 148         BPF_FUNC_get_smp_processor_id, /* u32 raw_smp_processor_id(void) */
 149
 150         /**
 151          * skb_store_bytes(skb, offset, from, len, flags) - store bytes into packet
 152          * @skb: pointer to skb
 153          * @offset: offset within packet from skb->mac_header
 154          * @from: pointer where to copy bytes from
 155          * @len: number of bytes to store into packet
 156          * @flags: bit 0 - if true, recompute skb->csum
 157          *         other bits - reserved
 158          * Return: 0 on success
 159          */
 160         BPF_FUNC_skb_store_bytes,
 161
 162         /**
 163          * l3_csum_replace(skb, offset, from, to, flags) - recompute IP checksum
 164          * @skb: pointer to skb
 165          * @offset: offset within packet where IP checksum is located
 166          * @from: old value of header field
 167          * @to: new value of header field
 168          * @flags: bits 0-3 - size of header field
 169          *         other bits - reserved
 170          * Return: 0 on success
 171          */
 172         BPF_FUNC_l3_csum_replace,
 173
 174         /**
 175          * l4_csum_replace(skb, offset, from, to, flags) - recompute TCP/UDP checksum
 176          * @skb: pointer to skb
 177          * @offset: offset within packet where TCP/UDP checksum is located
 178          * @from: old value of header field
 179          * @to: new value of header field
 180          * @flags: bits 0-3 - size of header field
 181          *         bit 4 - is pseudo header
 182          *         other bits - reserved
 183          * Return: 0 on success
 184          */
 185         BPF_FUNC_l4_csum_replace,
 186
 187         /**
 188          * bpf_tail_call(ctx, prog_array_map, index) - jump into another BPF program
 189          * @ctx: context pointer passed to next program
 190          * @prog_array_map: pointer to map which type is BPF_MAP_TYPE_PROG_ARRAY
 191          * @index: index inside array that selects specific program to run
 192          * Return: 0 on success
 193          */
 194         BPF_FUNC_tail_call,
 195
 196         /**
 197          * bpf_clone_redirect(skb, ifindex, flags) - redirect to another netdev
 198          * @skb: pointer to skb
 199          * @ifindex: ifindex of the net device
 200          * @flags: bit 0 - if set, redirect to ingress instead of egress
 201          *         other bits - reserved
 202          * Return: 0 on success
 203          */
 204         BPF_FUNC_clone_redirect,
 205
 206         /**
 207          * u64 bpf_get_current_pid_tgid(void)
 208          * Return: current->tgid << 32 | current->pid
 209          */
 210         BPF_FUNC_get_current_pid_tgid,
 211
 212         /**
 213          * u64 bpf_get_current_uid_gid(void)
 214          * Return: current_gid << 32 | current_uid
 215          */
 216         BPF_FUNC_get_current_uid_gid,
 217
 218         /**
 219          * bpf_get_current_comm(char *buf, int size_of_buf)
 220          * stores current->comm into buf
 221          * Return: 0 on success
 222          */
 223         BPF_FUNC_get_current_comm,
 224
 225         /**
 226          * bpf_get_cgroup_classid(skb) - retrieve a proc's classid
 227          * @skb: pointer to skb
 228          * Return: classid if != 0
 229          */
 230         BPF_FUNC_get_cgroup_classid,
 231         BPF_FUNC_skb_vlan_push, /* bpf_skb_vlan_push(skb, vlan_proto, vlan_tci) */
 232         BPF_FUNC_skb_vlan_pop,  /* bpf_skb_vlan_pop(skb) */
 233
 234         /**
 235          * bpf_skb_[gs]et_tunnel_key(skb, key, size, flags)
 236          * retrieve or populate tunnel metadata
 237          * @skb: pointer to skb
 238          * @key: pointer to 'struct bpf_tunnel_key'
 239          * @size: size of 'struct bpf_tunnel_key'
 240          * @flags: room for future extensions
 241          * Retrun: 0 on success
 242          */
 243         BPF_FUNC_skb_get_tunnel_key,
 244         BPF_FUNC_skb_set_tunnel_key,
 245         BPF_FUNC_perf_event_read,       /* u64 bpf_perf_event_read(&map, index) */
 246         /**
 247          * bpf_redirect(ifindex, flags) - redirect to another netdev
 248          * @ifindex: ifindex of the net device
 249          * @flags: bit 0 - if set, redirect to ingress instead of egress
 250          *         other bits - reserved
 251          * Return: TC_ACT_REDIRECT
 252          */
 253         BPF_FUNC_redirect,
 254
 255         /**
 256          * bpf_get_route_realm(skb) - retrieve a dst's tclassid
 257          * @skb: pointer to skb
 258          * Return: realm if != 0
 259          */
 260         BPF_FUNC_get_route_realm,
 261
 262         /**
 263          * bpf_perf_event_output(ctx, map, index, data, size) - output perf raw sample
 264          * @ctx: struct pt_regs*
 265          * @map: pointer to perf_event_array map
 266          * @index: index of event in the map
 267          * @data: data on stack to be output as raw data
 268          * @size: size of data
 269          * Return: 0 on success
 270          */
 271         BPF_FUNC_perf_event_output,
 272         __BPF_FUNC_MAX_ID,
 273 };
 274
 275 /* user accessible mirror of in-kernel sk_buff.
 276  * new fields can only be added to the end of this structure
 277  */
 278 struct __sk_buff {
 279         __u32 len;
 280         __u32 pkt_type;
 281         __u32 mark;
 282         __u32 queue_mapping;
 283         __u32 protocol;
 284         __u32 vlan_present;
 285         __u32 vlan_tci;
 286         __u32 vlan_proto;
 287         __u32 priority;
 288         __u32 ingress_ifindex;
 289         __u32 ifindex;
 290         __u32 tc_index;
 291         __u32 cb[5];
 292         __u32 hash;
 293         __u32 tc_classid;
 294 };
 295
 296 struct bpf_tunnel_key {
 297         __u32 tunnel_id;
 298         __u32 remote_ipv4;
 299 };
 300
 301 #endif /* _UAPI__LINUX_BPF_H__ */