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libnetlink: Use NLMSG_LENGTH to set nlmsg_len 

Change nlmsg_len from sizeof(req) to use NLMSG_LENGTH on the header.
2 of the inner headers are not 4-byte aligned, so add a 0-length buf
after the header with the __aligned(NLMSG_ALIGNTO) to ensure the size
of the request is large enough. Use NLMSG_ALIGN in NLMSG_LENGTH to set
nlmsg_len.

Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
David Ahern 2018-10-19 15:34:44 -07:00
parent 2750252d7e
commit 92e03242c4
1 changed files with 14 additions and 10 deletions
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24
lib/libnetlink.c
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@ -28,6 +28,8 @@
#include "libnetlink.h"
#define __aligned(x) __attribute__((aligned(x)))
#ifndef SOL_NETLINK
#define SOL_NETLINK 270
#endif
@ -238,7 +240,7 @@ int rtnl_addrdump_req(struct rtnl_handle *rth, int family)
struct nlmsghdr nlh;
struct ifaddrmsg ifm;
} req = {
.nlh.nlmsg_len = sizeof(req),
.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
.nlh.nlmsg_type = RTM_GETADDR,
.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
.nlh.nlmsg_seq = rth->dump = ++rth->seq,
@ -254,7 +256,7 @@ int rtnl_addrlbldump_req(struct rtnl_handle *rth, int family)
struct nlmsghdr nlh;
struct ifaddrlblmsg ifal;
} req = {
.nlh.nlmsg_len = sizeof(req),
.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrlblmsg)),
.nlh.nlmsg_type = RTM_GETADDRLABEL,
.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
.nlh.nlmsg_seq = rth->dump = ++rth->seq,
@ -270,7 +272,7 @@ int rtnl_routedump_req(struct rtnl_handle *rth, int family)
struct nlmsghdr nlh;
struct rtmsg rtm;
} req = {
.nlh.nlmsg_len = sizeof(req),
.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)),
.nlh.nlmsg_type = RTM_GETROUTE,
.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
.nlh.nlmsg_seq = rth->dump = ++rth->seq,
@ -286,7 +288,7 @@ int rtnl_ruledump_req(struct rtnl_handle *rth, int family)
struct nlmsghdr nlh;
struct fib_rule_hdr frh;
} req = {
.nlh.nlmsg_len = sizeof(req),
.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
.nlh.nlmsg_type = RTM_GETRULE,
.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
.nlh.nlmsg_seq = rth->dump = ++rth->seq,
@ -302,7 +304,7 @@ int rtnl_neighdump_req(struct rtnl_handle *rth, int family)
struct nlmsghdr nlh;
struct ndmsg ndm;
} req = {
.nlh.nlmsg_len = sizeof(req),
.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
.nlh.nlmsg_type = RTM_GETNEIGH,
.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
.nlh.nlmsg_seq = rth->dump = ++rth->seq,
@ -318,7 +320,7 @@ int rtnl_neightbldump_req(struct rtnl_handle *rth, int family)
struct nlmsghdr nlh;
struct ndtmsg ndtmsg;
} req = {
.nlh.nlmsg_len = sizeof(req),
.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndtmsg)),
.nlh.nlmsg_type = RTM_GETNEIGHTBL,
.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
.nlh.nlmsg_seq = rth->dump = ++rth->seq,
@ -334,7 +336,7 @@ int rtnl_mdbdump_req(struct rtnl_handle *rth, int family)
struct nlmsghdr nlh;
struct br_port_msg bpm;
} req = {
.nlh.nlmsg_len = sizeof(req),
.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct br_port_msg)),
.nlh.nlmsg_type = RTM_GETMDB,
.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
.nlh.nlmsg_seq = rth->dump = ++rth->seq,
@ -349,8 +351,9 @@ int rtnl_netconfdump_req(struct rtnl_handle *rth, int family)
struct {
struct nlmsghdr nlh;
struct netconfmsg ncm;
char buf[0] __aligned(NLMSG_ALIGNTO);
} req = {
.nlh.nlmsg_len = sizeof(req),
.nlh.nlmsg_len = NLMSG_LENGTH(NLMSG_ALIGN(sizeof(struct netconfmsg))),
.nlh.nlmsg_type = RTM_GETNETCONF,
.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
.nlh.nlmsg_seq = rth->dump = ++rth->seq,
@ -365,8 +368,9 @@ int rtnl_nsiddump_req(struct rtnl_handle *rth, int family)
struct {
struct nlmsghdr nlh;
struct rtgenmsg rtm;
char buf[0] __aligned(NLMSG_ALIGNTO);
} req = {
.nlh.nlmsg_len = sizeof(req),
.nlh.nlmsg_len = NLMSG_LENGTH(NLMSG_ALIGN(sizeof(struct rtgenmsg))),
.nlh.nlmsg_type = RTM_GETNSID,
.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
.nlh.nlmsg_seq = rth->dump = ++rth->seq,
@ -388,7 +392,7 @@ int rtnl_linkdump_req_filter(struct rtnl_handle *rth, int family,
struct nlmsghdr nlh;
struct ifinfomsg ifm;
/* attribute has to be NLMSG aligned */
struct rtattr ext_req __attribute__ ((aligned(NLMSG_ALIGNTO)));
struct rtattr ext_req __aligned(NLMSG_ALIGNTO);
__u32 ext_filter_mask;
} req = {
.nlh.nlmsg_len = sizeof(req),