/* * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "defs.h" #ifdef HAVE_LINUX_BPF_H # include <linux/bpf.h> #endif #include "xlat/bpf_commands.h" #include "xlat/bpf_map_types.h" #include "xlat/bpf_prog_types.h" #include "xlat/bpf_map_update_elem_flags.h" static int bpf_map_create(struct tcb *tcp, const long addr, unsigned int size) { struct { uint32_t map_type, key_size, value_size, max_entries; } attr = {}; if (!size) { printaddr(addr); return RVAL_DECODED | RVAL_FD; } if (size > sizeof(attr)) size = sizeof(attr); if (umoven_or_printaddr(tcp, addr, size, &attr)) return RVAL_DECODED | RVAL_FD; tprints("{map_type="); printxval(bpf_map_types, attr.map_type, "BPF_MAP_TYPE_???"); tprintf(", key_size=%u, value_size=%u, max_entries=%u}", attr.key_size, attr.value_size, attr.max_entries); return RVAL_DECODED | RVAL_FD; } static void bpf_map_update_elem(struct tcb *tcp, const long addr, unsigned int size) { struct { uint32_t map_fd; uint64_t ATTRIBUTE_ALIGNED(8) key; uint64_t ATTRIBUTE_ALIGNED(8) value; uint64_t flags; } attr = {}; if (!size) { printaddr(addr); return; } if (size > sizeof(attr)) size = sizeof(attr); if (umoven_or_printaddr(tcp, addr, size, &attr)) return; tprints("{map_fd="); printfd(tcp, attr.map_fd); tprintf(", key=%#" PRIx64 ", value=%#" PRIx64 ", flags=", attr.key, attr.value); printxval(bpf_map_update_elem_flags, attr.flags, "BPF_???"); tprints("}"); } static void bpf_map_delete_elem(struct tcb *tcp, const long addr, unsigned int size) { struct { uint32_t map_fd; uint64_t ATTRIBUTE_ALIGNED(8) key; } attr = {}; if (!size) { printaddr(addr); return; } if (size > sizeof(attr)) size = sizeof(attr); if (umoven_or_printaddr(tcp, addr, size, &attr)) return; tprints("{map_fd="); printfd(tcp, attr.map_fd); tprintf(", key=%#" PRIx64 "}", attr.key); } static int bpf_map_io(struct tcb *tcp, const long addr, unsigned int size, const char *text) { struct bpf_io_elem_struct { uint32_t map_fd; uint64_t ATTRIBUTE_ALIGNED(8) key; uint64_t ATTRIBUTE_ALIGNED(8) value; } attr = {}; if (exiting(tcp)) { if (!syserror(tcp) && !umove_or_printaddr(tcp, addr, &attr)) tprintf(", %s=%#" PRIx64, text, attr.value); tprints("}"); return RVAL_DECODED; } if (!size) { printaddr(addr); return RVAL_DECODED; } if (size > sizeof(attr)) size = sizeof(attr); if (umoven_or_printaddr(tcp, addr, size, &attr)) return RVAL_DECODED; tprints("{map_fd="); printfd(tcp, attr.map_fd); tprintf(", key=%#" PRIx64, attr.key); return 0; } static int bpf_prog_load(struct tcb *tcp, const long addr, unsigned int size) { struct { uint32_t prog_type, insn_cnt; uint64_t ATTRIBUTE_ALIGNED(8) insns, license; uint32_t log_level, log_size; uint64_t ATTRIBUTE_ALIGNED(8) log_buf; uint32_t kern_version; } attr = {}; if (!size) { printaddr(addr); return RVAL_DECODED | RVAL_FD; } if (size > sizeof(attr)) size = sizeof(attr); if (umoven_or_printaddr(tcp, addr, size, &attr)) return RVAL_DECODED | RVAL_FD; tprints("{prog_type="); printxval(bpf_prog_types, attr.prog_type, "BPF_PROG_TYPE_???"); tprintf(", insn_cnt=%u, insns=%#" PRIx64 ", license=", attr.insn_cnt, attr.insns); printstr(tcp, attr.license, -1); tprintf(", log_level=%u, log_size=%u, log_buf=%#" PRIx64 ", kern_version=%u}", attr.log_level, attr.log_size, attr.log_buf, attr.kern_version); return RVAL_DECODED | RVAL_FD; } SYS_FUNC(bpf) { const int cmd = tcp->u_arg[0]; const long addr = tcp->u_arg[1]; const unsigned int size = tcp->u_arg[2]; int rc = RVAL_DECODED; if (entering(tcp)) { printxval(bpf_commands, cmd, "BPF_???"); tprints(", "); } switch (cmd) { case BPF_MAP_CREATE: rc = bpf_map_create(tcp, addr, size); break; case BPF_MAP_LOOKUP_ELEM: rc = bpf_map_io(tcp, addr, size, "value"); break; case BPF_MAP_UPDATE_ELEM: bpf_map_update_elem(tcp, addr, size); break; case BPF_MAP_DELETE_ELEM: bpf_map_delete_elem(tcp, addr, size); break; case BPF_MAP_GET_NEXT_KEY: rc = bpf_map_io(tcp, addr, size, "next_key"); break; case BPF_PROG_LOAD: rc = bpf_prog_load(tcp, addr, size); break; default: printaddr(addr); break; } if (rc & RVAL_DECODED) tprintf(", %u", size); return rc; }