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12d8bb64e3
The XDP prog checks if the incoming packet matches any VIP:PORT combination in the BPF hashmap. If it is, it will encapsulate the packet with a IPv4/v6 header as instructed by the value of the BPF hashmap and then XDP_TX it out. The VIP:PORT -> IP-Encap-Info can be specified by the cmd args of the user prog. Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
162 lines
6.1 KiB
C
162 lines
6.1 KiB
C
#ifndef __BPF_HELPERS_H
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#define __BPF_HELPERS_H
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/* helper macro to place programs, maps, license in
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* different sections in elf_bpf file. Section names
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* are interpreted by elf_bpf loader
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*/
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#define SEC(NAME) __attribute__((section(NAME), used))
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/* helper functions called from eBPF programs written in C */
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static void *(*bpf_map_lookup_elem)(void *map, void *key) =
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(void *) BPF_FUNC_map_lookup_elem;
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static int (*bpf_map_update_elem)(void *map, void *key, void *value,
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unsigned long long flags) =
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(void *) BPF_FUNC_map_update_elem;
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static int (*bpf_map_delete_elem)(void *map, void *key) =
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(void *) BPF_FUNC_map_delete_elem;
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static int (*bpf_probe_read)(void *dst, int size, void *unsafe_ptr) =
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(void *) BPF_FUNC_probe_read;
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static unsigned long long (*bpf_ktime_get_ns)(void) =
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(void *) BPF_FUNC_ktime_get_ns;
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static int (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) =
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(void *) BPF_FUNC_trace_printk;
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static void (*bpf_tail_call)(void *ctx, void *map, int index) =
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(void *) BPF_FUNC_tail_call;
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static unsigned long long (*bpf_get_smp_processor_id)(void) =
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(void *) BPF_FUNC_get_smp_processor_id;
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static unsigned long long (*bpf_get_current_pid_tgid)(void) =
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(void *) BPF_FUNC_get_current_pid_tgid;
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static unsigned long long (*bpf_get_current_uid_gid)(void) =
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(void *) BPF_FUNC_get_current_uid_gid;
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static int (*bpf_get_current_comm)(void *buf, int buf_size) =
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(void *) BPF_FUNC_get_current_comm;
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static int (*bpf_perf_event_read)(void *map, int index) =
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(void *) BPF_FUNC_perf_event_read;
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static int (*bpf_clone_redirect)(void *ctx, int ifindex, int flags) =
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(void *) BPF_FUNC_clone_redirect;
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static int (*bpf_redirect)(int ifindex, int flags) =
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(void *) BPF_FUNC_redirect;
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static int (*bpf_perf_event_output)(void *ctx, void *map,
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unsigned long long flags, void *data,
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int size) =
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(void *) BPF_FUNC_perf_event_output;
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static int (*bpf_get_stackid)(void *ctx, void *map, int flags) =
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(void *) BPF_FUNC_get_stackid;
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static int (*bpf_probe_write_user)(void *dst, void *src, int size) =
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(void *) BPF_FUNC_probe_write_user;
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static int (*bpf_current_task_under_cgroup)(void *map, int index) =
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(void *) BPF_FUNC_current_task_under_cgroup;
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static int (*bpf_skb_get_tunnel_key)(void *ctx, void *key, int size, int flags) =
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(void *) BPF_FUNC_skb_get_tunnel_key;
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static int (*bpf_skb_set_tunnel_key)(void *ctx, void *key, int size, int flags) =
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(void *) BPF_FUNC_skb_set_tunnel_key;
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static int (*bpf_skb_get_tunnel_opt)(void *ctx, void *md, int size) =
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(void *) BPF_FUNC_skb_get_tunnel_opt;
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static int (*bpf_skb_set_tunnel_opt)(void *ctx, void *md, int size) =
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(void *) BPF_FUNC_skb_set_tunnel_opt;
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static unsigned long long (*bpf_get_prandom_u32)(void) =
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(void *) BPF_FUNC_get_prandom_u32;
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static int (*bpf_xdp_adjust_head)(void *ctx, int offset) =
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(void *) BPF_FUNC_xdp_adjust_head;
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/* llvm builtin functions that eBPF C program may use to
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* emit BPF_LD_ABS and BPF_LD_IND instructions
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*/
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struct sk_buff;
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unsigned long long load_byte(void *skb,
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unsigned long long off) asm("llvm.bpf.load.byte");
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unsigned long long load_half(void *skb,
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unsigned long long off) asm("llvm.bpf.load.half");
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unsigned long long load_word(void *skb,
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unsigned long long off) asm("llvm.bpf.load.word");
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/* a helper structure used by eBPF C program
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* to describe map attributes to elf_bpf loader
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*/
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struct bpf_map_def {
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unsigned int type;
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unsigned int key_size;
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unsigned int value_size;
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unsigned int max_entries;
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unsigned int map_flags;
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};
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static int (*bpf_skb_load_bytes)(void *ctx, int off, void *to, int len) =
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(void *) BPF_FUNC_skb_load_bytes;
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static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
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(void *) BPF_FUNC_skb_store_bytes;
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static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
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(void *) BPF_FUNC_l3_csum_replace;
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static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) =
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(void *) BPF_FUNC_l4_csum_replace;
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static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) =
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(void *) BPF_FUNC_skb_under_cgroup;
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static int (*bpf_skb_change_head)(void *, int len, int flags) =
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(void *) BPF_FUNC_skb_change_head;
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#if defined(__x86_64__)
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#define PT_REGS_PARM1(x) ((x)->di)
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#define PT_REGS_PARM2(x) ((x)->si)
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#define PT_REGS_PARM3(x) ((x)->dx)
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#define PT_REGS_PARM4(x) ((x)->cx)
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#define PT_REGS_PARM5(x) ((x)->r8)
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#define PT_REGS_RET(x) ((x)->sp)
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#define PT_REGS_FP(x) ((x)->bp)
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#define PT_REGS_RC(x) ((x)->ax)
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#define PT_REGS_SP(x) ((x)->sp)
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#define PT_REGS_IP(x) ((x)->ip)
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#elif defined(__s390x__)
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#define PT_REGS_PARM1(x) ((x)->gprs[2])
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#define PT_REGS_PARM2(x) ((x)->gprs[3])
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#define PT_REGS_PARM3(x) ((x)->gprs[4])
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#define PT_REGS_PARM4(x) ((x)->gprs[5])
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#define PT_REGS_PARM5(x) ((x)->gprs[6])
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#define PT_REGS_RET(x) ((x)->gprs[14])
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#define PT_REGS_FP(x) ((x)->gprs[11]) /* Works only with CONFIG_FRAME_POINTER */
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#define PT_REGS_RC(x) ((x)->gprs[2])
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#define PT_REGS_SP(x) ((x)->gprs[15])
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#define PT_REGS_IP(x) ((x)->psw.addr)
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#elif defined(__aarch64__)
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#define PT_REGS_PARM1(x) ((x)->regs[0])
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#define PT_REGS_PARM2(x) ((x)->regs[1])
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#define PT_REGS_PARM3(x) ((x)->regs[2])
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#define PT_REGS_PARM4(x) ((x)->regs[3])
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#define PT_REGS_PARM5(x) ((x)->regs[4])
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#define PT_REGS_RET(x) ((x)->regs[30])
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#define PT_REGS_FP(x) ((x)->regs[29]) /* Works only with CONFIG_FRAME_POINTER */
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#define PT_REGS_RC(x) ((x)->regs[0])
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#define PT_REGS_SP(x) ((x)->sp)
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#define PT_REGS_IP(x) ((x)->pc)
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#elif defined(__powerpc__)
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#define PT_REGS_PARM1(x) ((x)->gpr[3])
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#define PT_REGS_PARM2(x) ((x)->gpr[4])
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#define PT_REGS_PARM3(x) ((x)->gpr[5])
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#define PT_REGS_PARM4(x) ((x)->gpr[6])
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#define PT_REGS_PARM5(x) ((x)->gpr[7])
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#define PT_REGS_RC(x) ((x)->gpr[3])
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#define PT_REGS_SP(x) ((x)->sp)
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#define PT_REGS_IP(x) ((x)->nip)
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#endif
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#ifdef __powerpc__
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#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; })
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#define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
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#else
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#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ \
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bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
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#define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ \
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bpf_probe_read(&(ip), sizeof(ip), \
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(void *)(PT_REGS_FP(ctx) + sizeof(ip))); })
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#endif
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#endif
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