linux: added new constants (e.g. attach BPF to socket)

increased default BPF prog load log size (too small)

syscall/linux/constants.lua

@@ -426,7 +426,7 @@ c.SO = strflag(arch.SO or {
   PRIORITY    = 12,
   LINGER      = 13,
   BSDCOMPAT   = 14,
---REUSEPORT   = 15, -- new, may not be defined yet
+  REUSEPORT   = 15, -- new, may not be defined yet
   PASSCRED    = 16,
   PEERCRED    = 17,
   RCVLOWAT    = 18,
@@ -455,9 +455,19 @@ c.SO = strflag(arch.SO or {
   WIFI_STATUS        = 41,
   PEEK_OFF           = 42,
   NOFCS              = 43,
+  LOCK_FILTER        = 44,
+  SELECT_ERR_QUEUE   = 45,
+  BUSY_POLL          = 46,
+  MAX_PACING_RATE    = 47,
+  BPF_EXTENSIONS     = 48,
+  INCOMING_CPU       = 49,
+  ATTACH_BPF         = 50,
+  ATTACH_REUSEPORT_CBPF = 51,
+  ATTACH_REUSEPORT_EBPF = 52,
 })
 
 c.SO.GET_FILTER = c.SO.ATTACH_FILTER
+c.SO.DETACH_BPF = c.SO.DETACH_FILTER
 
 -- Maximum queue length specifiable by listen.
 c.SOMAXCONN = 128
@@ -2065,6 +2075,10 @@ c.BPF = multiflags {
   TXA        = 0x80,
   TO_LE      = 0x00,
   TO_BE      = 0x08,
+-- flags
+  ANY        = 0,
+  NOEXIST    = 1,
+  EXIST      = 2,
 }
 
 -- eBPF flags

syscall/linux/syscalls.lua

@@ -781,9 +781,9 @@ if C.bpf then
   function S.bpf(cmd, attr)
     return C.bpf(cmd, attr)
   end
-  function S.bpf_prog_load(type, insns, len, license, version)
-    if not license then license = "GPL" end       -- Must stay alive during the syscall
-    local bpf_log_buf = ffi.new('char [?]', 4096) -- Must stay alive during the syscall
+  function S.bpf_prog_load(type, insns, len, license, version, log_level)
+    if not license then license = "GPL" end          -- Must stay alive during the syscall
+    local bpf_log_buf = ffi.new('char [?]', 64*1024) -- Must stay alive during the syscall
     if not version then
       -- We have no better way to extract current kernel hex-string other
       -- than parsing headers, compiling a helper function or reading /proc
@@ -800,14 +800,14 @@ if C.bpf then
     attr[0].insn_cnt = len
     attr[0].license = ptr_to_u64(license)
     attr[0].log_buf = ptr_to_u64(bpf_log_buf)
-    attr[0].log_size = 4096
-    attr[0].log_level = 1
+    attr[0].log_size = ffi.sizeof(bpf_log_buf)
+    attr[0].log_level = log_level or 1
     attr[0].kern_version = version -- MUST match current kernel version
     local fd = S.bpf(c.BPF_CMD.PROG_LOAD, attr)
     if fd < 0 then
       return nil, t.error(errno()), ffi.string(bpf_log_buf)
     end
-    return fd
+    return retfd(fd), ffi.string(bpf_log_buf)
   end
   function S.bpf_map_create(type, key_size, value_size, max_entries)
     local attr = t.bpf_attr1()
@@ -819,7 +819,7 @@ if C.bpf then
     if fd < 0 then
       return nil, t.error(errno())
     end
-    return fd
+    return retfd(fd)
   end
   function S.bpf_map_op(op, fd, key, val_or_next, flags)
     local attr = t.bpf_attr1()

test/ctest-linux.lua

@@ -80,6 +80,9 @@ c.BPF.CALL = nil
 c.BPF.EXIT = nil
 c.BPF.TO_LE = nil
 c.BPF.TO_BE = nil
+c.BPF.ANY = nil
+c.BPF.NOEXIST = nil
+c.BPF.EXIST = nil
 c.BPF.END = nil
 c.BPF.ARSH = nil
 c.BPF.XADD = nil
@@ -304,6 +307,17 @@ c.SO.PEEK_OFF = nil
 c.SO.GET_FILTER = nil
 c.SO.NOFCS = nil
 c.SO.WIFI_STATUS = nil
+c.SO.REUSEPORT = nil
+c.SO.LOCK_FILTER = nil
+c.SO.SELECT_ERR_QUEUE = nil
+c.SO.BUSY_POLL = nil
+c.SO.MAX_PACING_RATE = nil
+c.SO.BPF_EXTENSIONS = nil
+c.SO.INCOMING_CPU = nil
+c.SO.ATTACH_BPF = nil
+c.SO.DETACH_BPF = nil
+c.SO.ATTACH_REUSEPORT_CBPF = nil
+c.SO.ATTACH_REUSEPORT_EBPF = nil
 
 -- Musl changes some of the syscall constants in its 32/64 bit handling
 c.SYS.getdents = nil

test/linux-constants.lua

@@ -160,6 +160,13 @@ local function fixup_constants(abi, c)
   c.RTA.VIA = nil
   c.RTA.MFC_STATS = nil
   c.AUDIT_ARCH.AARCH64 = nil
+  c.SO.MAX_PACING_RATE = nil
+  c.SO.BPF_EXTENSIONS = nil
+  c.SO.INCOMING_CPU = nil
+  c.SO.ATTACH_BPF = nil
+  c.SO.DETACH_BPF = nil
+  c.SO.ATTACH_REUSEPORT_CBPF = nil
+  c.SO.ATTACH_REUSEPORT_EBPF = nil
 
   -- these are not even in linux git head headers or names wrong
   c.O.ASYNC = nil
@@ -228,6 +235,9 @@ local function fixup_constants(abi, c)
   c.BPF.XADD = nil
   c.BPF.JNE = nil
   c.BPF.MOV = nil
+  c.BPF.ANY = nil
+  c.BPF.EXIST = nil
+  c.BPF.NOEXIST = nil
 
   return c
 end