mirror of https://gerrit.osmocom.org/libosmocore
socket.h: Introduce API osmo_sockaddr_netmask_to_prefixlen()
Implementation is imported from osmo-ggsn.git 97f60e3dca581797007524e0006ca9fafad59713 in46a_netmasklen() and adapter to work with an osmo_sockaddr. This will be used by osmocom-bb's "modem" app. Change-Id: I75e75e251c6776801fffdde745aebedf21c68799
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@ -7,5 +7,5 @@
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# If any interfaces have been added since the last public release: c:r:a + 1.
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# If any interfaces have been removed or changed since the last public release: c:r:0.
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#library what description / commit summary line
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libosmocore new API osmo_sockaddr_is_any()
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libosmocore new API osmo_sockaddr_is_any(), osmo_sockaddr_netmask_to_prefixlen()
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libosmocore ABI breakage OSMO_NUM_DLIB change affecting internal_cat[]
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@ -50,6 +50,8 @@ int osmo_sockaddr_cmp(const struct osmo_sockaddr *a,
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int osmo_sockaddr_to_octets(uint8_t *dst, size_t dst_maxlen, const struct osmo_sockaddr *os);
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int osmo_sockaddr_from_octets(struct osmo_sockaddr *os, const void *src, size_t src_len);
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int osmo_sockaddr_netmask_to_prefixlen(const struct osmo_sockaddr *addr);
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const char *osmo_sockaddr_to_str(const struct osmo_sockaddr *sockaddr);
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char *osmo_sockaddr_to_str_buf(char *buf, size_t buf_len,
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const struct osmo_sockaddr *sockaddr);
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57
src/socket.c
57
src/socket.c
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@ -1291,6 +1291,63 @@ void osmo_sockaddr_set_port(struct sockaddr *sa, uint16_t port)
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}
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}
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static unsigned int in6_addr_netmask_to_prefixlen(const struct in6_addr *netmask)
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{
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#if defined(__linux__)
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#define ADDRFIELD(i) s6_addr32[i]
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#else
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#define ADDRFIELD(i) __u6_addr.__u6_addr32[i]
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#endif
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unsigned int i, j, prefix = 0;
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for (j = 0; j < 4; j++) {
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uint32_t bits = netmask->ADDRFIELD(j);
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uint8_t *b = (uint8_t *)&bits;
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for (i = 0; i < 4; i++) {
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while (b[i] & 0x80) {
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prefix++;
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b[i] = b[i] << 1;
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}
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}
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}
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#undef ADDRFIELD
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return prefix;
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}
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static unsigned int in_addr_netmask_to_prefixlen(const struct in_addr *netmask)
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{
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uint32_t bits = netmask->s_addr;
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uint8_t *b = (uint8_t *)&bits;
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unsigned int i, prefix = 0;
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for (i = 0; i < 4; i++) {
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while (b[i] & 0x80) {
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prefix++;
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b[i] = b[i] << 1;
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}
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}
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return prefix;
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}
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/*! Convert netmask to prefix length representation
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* \param[in] netmask sockaddr containing a netmask (consecutive list of 1-bit followed by consecutive list of 0-bit)
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* \returns prefix length representation of the netmask (count of 1-bit from the start of the netmask), negative on error.
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*/
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int osmo_sockaddr_netmask_to_prefixlen(const struct osmo_sockaddr *netmask)
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{
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switch (netmask->u.sa.sa_family) {
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case AF_INET6:
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return in6_addr_netmask_to_prefixlen(&netmask->u.sin6.sin6_addr);
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case AF_INET:
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return in_addr_netmask_to_prefixlen(&netmask->u.sin.sin_addr);
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default:
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return -ENOTSUP;
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}
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}
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/*! Initialize a unix domain socket (including bind/connect)
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* \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM
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* \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP
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@ -385,6 +385,63 @@ static void test_osa_str(void)
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OSMO_ASSERT(!strncmp("[2003:1234:5678:90ab:cdef:1234:4321:4321]:23420", result, sizeof(buf)));
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}
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static void test_osa_netmask_prefixlen(void)
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{
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struct osmo_sockaddr ipv4;
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struct osmo_sockaddr ipv6;
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int rc;
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ipv4.u.sin = (struct sockaddr_in){
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.sin_family = AF_INET,
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};
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ipv4.u.sin.sin_addr.s_addr = inet_addr("0.0.0.0");
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rc = osmo_sockaddr_netmask_to_prefixlen(&ipv4);
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OSMO_ASSERT(rc == 0);
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ipv4.u.sin.sin_addr.s_addr = inet_addr("255.0.0.0");
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rc = osmo_sockaddr_netmask_to_prefixlen(&ipv4);
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OSMO_ASSERT(rc == 8);
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ipv4.u.sin.sin_addr.s_addr = inet_addr("255.255.0.0");
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rc = osmo_sockaddr_netmask_to_prefixlen(&ipv4);
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OSMO_ASSERT(rc == 16);
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ipv4.u.sin.sin_addr.s_addr = inet_addr("255.255.255.0");
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rc = osmo_sockaddr_netmask_to_prefixlen(&ipv4);
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OSMO_ASSERT(rc == 24);
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ipv4.u.sin.sin_addr.s_addr = inet_addr("255.255.255.255");
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rc = osmo_sockaddr_netmask_to_prefixlen(&ipv4);
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OSMO_ASSERT(rc == 32);
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ipv4.u.sin.sin_addr.s_addr = inet_addr("0.255.0.0");
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rc = osmo_sockaddr_netmask_to_prefixlen(&ipv4);
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/* FIXME: This shows the implementation is not that robust checking validity of input netmask: */
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OSMO_ASSERT(rc == 8);
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ipv6.u.sin6 = (struct sockaddr_in6){
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.sin6_family = AF_INET6,
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};
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inet_pton(AF_INET6, "fe::", &ipv6.u.sin6.sin6_addr);
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rc = osmo_sockaddr_netmask_to_prefixlen(&ipv6);
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OSMO_ASSERT(rc == 7);
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inet_pton(AF_INET6, "ff::", &ipv6.u.sin6.sin6_addr);
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rc = osmo_sockaddr_netmask_to_prefixlen(&ipv6);
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OSMO_ASSERT(rc == 8);
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inet_pton(AF_INET6, "ff:ff::", &ipv6.u.sin6.sin6_addr);
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rc = osmo_sockaddr_netmask_to_prefixlen(&ipv6);
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OSMO_ASSERT(rc == 16);
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inet_pton(AF_INET6, "ff:ff::ff", &ipv6.u.sin6.sin6_addr);
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rc = osmo_sockaddr_netmask_to_prefixlen(&ipv6);
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/* FIXME: This shows the implementation is not that robust checking validity of input netmask: */
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OSMO_ASSERT(rc == 24);
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}
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const struct log_info_cat default_categories[] = {
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};
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@ -407,6 +464,7 @@ int main(int argc, char *argv[])
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test_get_ip_and_port();
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test_sockinit_osa();
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test_osa_str();
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test_osa_netmask_prefixlen();
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return EXIT_SUCCESS;
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}
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