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utils: Introduce get_addr_rta() and inet_addr_match_rta() 

First is used to get address from netlink attribute to
inet_prefix data structure. Use memcpy() with constant
value to let complier optimize by replacing a call by
inlining load/store instructions.

Second is used to match address in given netlink attribute
with one given as reference. It matches successfully if
no attribute is given (@rta is NULL), reference address
family is AF_UNSPEC or it's length isn't given; fails if
get_attr_rta() can't get attribute or it's family does
not match reference; calls inet_addr_match() to get final
verdict.

Signed-off-by: Serhey Popovych <serhe.popovych@gmail.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
Serhey Popovych 2018-01-24 20:56:33 +02:00 committed by David Ahern
parent 68944e6f93
commit 27c523e209
2 changed files with 78 additions and 19 deletions
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2
include/utils.h
View File

@ -120,6 +120,7 @@ int get_prefix_1(inet_prefix *dst, char *arg, int family);
int get_addr(inet_prefix *dst, const char *arg, int family);
int get_prefix(inet_prefix *dst, char *arg, int family);
int mask2bits(__u32 netmask);
int get_addr_rta(inet_prefix *dst, const struct rtattr *rta, int family);
int get_addr_ila(__u64 *val, const char *arg);
int read_prop(const char *dev, char *prop, long *value);
@ -174,6 +175,7 @@ int check_ifname(const char *);
int get_ifname(char *, const char *);
int matches(const char *arg, const char *pattern);
int inet_addr_match(const inet_prefix *a, const inet_prefix *b, int bits);
int inet_addr_match_rta(const inet_prefix *m, const struct rtattr *rta);
const char *dnet_ntop(int af, const void *addr, char *str, size_t len);
int dnet_pton(int af, const char *src, void *addr);

95
lib/utils.c
View File

@ -534,6 +534,28 @@ int get_addr64(__u64 *ap, const char *cp)
return 1;
}
static void set_address_type(inet_prefix *addr)
{
switch (addr->family) {
case AF_INET:
if (!addr->data[0])
addr->flags |= ADDRTYPE_INET_UNSPEC;
else if (IN_MULTICAST(ntohl(addr->data[0])))
addr->flags |= ADDRTYPE_INET_MULTI;
else
addr->flags |= ADDRTYPE_INET;
break;
case AF_INET6:
if (IN6_IS_ADDR_UNSPECIFIED(addr->data))
addr->flags |= ADDRTYPE_INET_UNSPEC;
else if (IN6_IS_ADDR_MULTICAST(addr->data))
addr->flags |= ADDRTYPE_INET_MULTI;
else
addr->flags |= ADDRTYPE_INET;
break;
}
}
static int __get_addr_1(inet_prefix *addr, const char *name, int family)
{
memset(addr, 0, sizeof(*addr));
@ -627,25 +649,7 @@ int get_addr_1(inet_prefix *addr, const char *name, int family)
if (ret)
return ret;
switch (addr->family) {
case AF_INET:
if (!addr->data[0])
addr->flags |= ADDRTYPE_INET_UNSPEC;
else if (IN_MULTICAST(ntohl(addr->data[0])))
addr->flags |= ADDRTYPE_INET_MULTI;
else
addr->flags |= ADDRTYPE_INET;
break;
case AF_INET6:
if (IN6_IS_ADDR_UNSPECIFIED(addr->data))
addr->flags |= ADDRTYPE_INET_UNSPEC;
else if (IN6_IS_ADDR_MULTICAST(addr->data))
addr->flags |= ADDRTYPE_INET_MULTI;
else
addr->flags |= ADDRTYPE_INET;
break;
}
set_address_type(addr);
return 0;
}
@ -734,6 +738,46 @@ int get_addr(inet_prefix *dst, const char *arg, int family)
return 0;
}
int get_addr_rta(inet_prefix *dst, const struct rtattr *rta, int family)
{
const int len = RTA_PAYLOAD(rta);
const void *data = RTA_DATA(rta);
switch (len) {
case 4:
dst->family = AF_INET;
dst->bytelen = 4;
memcpy(dst->data, data, 4);
break;
case 16:
dst->family = AF_INET6;
dst->bytelen = 16;
memcpy(dst->data, data, 16);
break;
case 2:
dst->family = AF_DECnet;
dst->bytelen = 2;
memcpy(dst->data, data, 2);
break;
case 10:
dst->family = AF_IPX;
dst->bytelen = 10;
memcpy(dst->data, data, 10);
break;
default:
return -1;
}
if (family != AF_UNSPEC && family != dst->family)
return -2;
dst->bitlen = -1;
dst->flags = 0;
set_address_type(dst);
return 0;
}
int get_prefix(inet_prefix *dst, char *arg, int family)
{
if (family == AF_PACKET) {
@ -864,6 +908,19 @@ int inet_addr_match(const inet_prefix *a, const inet_prefix *b, int bits)
return 0;
}
int inet_addr_match_rta(const inet_prefix *m, const struct rtattr *rta)
{
inet_prefix dst;
if (!rta || m->family == AF_UNSPEC || m->bitlen <= 0)
return 0;
if (get_addr_rta(&dst, rta, m->family))
return -1;
return inet_addr_match(&dst, m, m->bitlen);
}
int __iproute2_hz_internal;
int __get_hz(void)