From: JingPiao Chen Date: Sun, 13 Aug 2017 02:22:23 +0000 (+0800) Subject: netlink: add a basic rtnetlink parser of rule messages X-Git-Tag: v4.19~141 X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=a0d3f258d0e584eb684dec14a8e085ca553163af;p=strace netlink: add a basic rtnetlink parser of rule messages * defs.h (routing_table_ids): New xlat prototype. * rtnl_rule.c: New file. * Makefile.am (strace_SOURCES): Add it. * defs.h (ip_type_of_services, routing_table_ids): New xlat prototypes. * netlink_route.h (decode_fib_rule_hdr): New prototype. * configure.ac (AC_CHECK_HEADERS): Add linux/fib_rules.h. * netlink_route.c (route_decoders): Add RTM_DELRULE, RTM_GETRULE, and RTM_NEWRULE. * xlat/fib_rule_actions.in: New file. * xlat/fib_rule_flags.in: Likewise. Co-authored-by: Fabien Siron --- diff --git a/Makefile.am b/Makefile.am index cea4d94a..5d535fac 100644 --- a/Makefile.am +++ b/Makefile.am @@ -250,6 +250,7 @@ strace_SOURCES = \ rtnl_addr.c \ rtnl_link.c \ rtnl_route.c \ + rtnl_rule.c \ sched.c \ sched_attr.h \ scsi.c \ diff --git a/configure.ac b/configure.ac index d213a464..1be4e81f 100644 --- a/configure.ac +++ b/configure.ac @@ -377,6 +377,7 @@ AC_CHECK_HEADERS(m4_normalize([ linux/dm-ioctl.h linux/dqblk_xfs.h linux/falloc.h + linux/fib_rules.h linux/fiemap.h linux/genetlink.h linux/hiddev.h diff --git a/defs.h b/defs.h index 8ce28c4f..e6659a57 100644 --- a/defs.h +++ b/defs.h @@ -292,6 +292,7 @@ extern const struct xlat ethernet_protocols[]; extern const struct xlat evdev_abs[]; extern const struct xlat iffflags[]; extern const struct xlat inet_protocols[]; +extern const struct xlat ip_type_of_services[]; extern const struct xlat msg_flags[]; extern const struct xlat netlink_protocols[]; extern const struct xlat nl_route_types[]; @@ -299,6 +300,7 @@ extern const struct xlat open_access_modes[]; extern const struct xlat open_mode_flags[]; extern const struct xlat resource_flags[]; extern const struct xlat routing_scopes[]; +extern const struct xlat routing_table_ids[]; extern const struct xlat setns_types[]; extern const struct xlat sg_io_info[]; extern const struct xlat socketlayers[]; diff --git a/netlink_route.c b/netlink_route.c index e32d832b..87766263 100644 --- a/netlink_route.c +++ b/netlink_route.c @@ -65,7 +65,11 @@ static const netlink_route_decoder_t route_decoders[] = { [RTM_DELROUTE - RTM_BASE] = decode_rtmsg, [RTM_GETROUTE - RTM_BASE] = decode_rtmsg, - [RTM_NEWROUTE - RTM_BASE] = decode_rtmsg + [RTM_NEWROUTE - RTM_BASE] = decode_rtmsg, + + [RTM_DELRULE - RTM_BASE] = decode_fib_rule_hdr, + [RTM_GETRULE - RTM_BASE] = decode_fib_rule_hdr, + [RTM_NEWRULE - RTM_BASE] = decode_fib_rule_hdr }; bool diff --git a/netlink_route.h b/netlink_route.h index 02d37899..0d89bcdf 100644 --- a/netlink_route.h +++ b/netlink_route.h @@ -39,6 +39,7 @@ route_decode_name(struct tcb *tcp, \ unsigned int len) \ /* End of DECL_NETLINK_ROUTE_DECODER definition. */ +extern DECL_NETLINK_ROUTE_DECODER(decode_fib_rule_hdr); extern DECL_NETLINK_ROUTE_DECODER(decode_ifaddrmsg); extern DECL_NETLINK_ROUTE_DECODER(decode_ifinfomsg); extern DECL_NETLINK_ROUTE_DECODER(decode_rtmsg); diff --git a/rtnl_rule.c b/rtnl_rule.c new file mode 100644 index 00000000..b3e6d526 --- /dev/null +++ b/rtnl_rule.c @@ -0,0 +1,78 @@ +/* + * Copyright (c) 2016 Fabien Siron + * Copyright (c) 2017 JingPiao Chen + * Copyright (c) 2016-2017 The strace developers. + * 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" + +#include "netlink_route.h" +#include "print_fields.h" + +#include "netlink.h" +#include +#ifdef HAVE_LINUX_FIB_RULES_H +# include +#endif + +#include "xlat/fib_rule_actions.h" +#include "xlat/fib_rule_flags.h" + +DECL_NETLINK_ROUTE_DECODER(decode_fib_rule_hdr) +{ + /* + * struct rtmsg and struct fib_rule_hdr are essentially + * the same structure, use struct rtmsg but treat it as + * struct fib_rule_hdr. + */ + struct rtmsg msg = { .rtm_family = family }; + const size_t offset = sizeof(msg.rtm_family); + + tprints("{family="); + printxval(addrfams, msg.rtm_family, "AF_???"); + + tprints(", "); + if (len >= sizeof(msg)) { + if (!umoven_or_printaddr(tcp, addr + offset, + sizeof(msg) - offset, + (void *) &msg + offset)) { + tprintf("dst_len=%u, src_len=%u", + msg.rtm_dst_len, msg.rtm_src_len); + tprints(", tos="); + printflags(ip_type_of_services, msg.rtm_tos, + "IPTOS_TOS_???"); + tprints(", table="); + printxval(routing_table_ids, msg.rtm_table, NULL); + tprints(", action="); + printxval(fib_rule_actions, msg.rtm_type, "FR_ACT_???"); + tprints(", flags="); + printflags(fib_rule_flags, msg.rtm_flags, + "FIB_RULE_???"); + } + } else + tprints("..."); + tprints("}"); +} diff --git a/xlat/fib_rule_actions.in b/xlat/fib_rule_actions.in new file mode 100644 index 00000000..55d59123 --- /dev/null +++ b/xlat/fib_rule_actions.in @@ -0,0 +1,9 @@ +FR_ACT_UNSPEC 0 +FR_ACT_TO_TBL 1 +FR_ACT_GOTO 2 +FR_ACT_NOP 3 +FR_ACT_RES3 4 +FR_ACT_RES4 5 +FR_ACT_BLACKHOLE 6 +FR_ACT_UNREACHABLE 7 +FR_ACT_PROHIBIT 8 diff --git a/xlat/fib_rule_flags.in b/xlat/fib_rule_flags.in new file mode 100644 index 00000000..8f4d42c0 --- /dev/null +++ b/xlat/fib_rule_flags.in @@ -0,0 +1,6 @@ +FIB_RULE_PERMANENT +FIB_RULE_INVERT +FIB_RULE_UNRESOLVED +FIB_RULE_IIF_DETACHED +FIB_RULE_OIF_DETACHED +FIB_RULE_FIND_SADDR