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Pau Espin Pedrol gerrit-no-reply at lists.osmocom.orgPau Espin Pedrol has submitted this change and it was merged.
Change subject: tun: Convert tun_ipv6_linklocal_get to be more generic
......................................................................
tun: Convert tun_ipv6_linklocal_get to be more generic
Add support for IPv4 and IPv6 global IPs. Also return the prefix length
of the IP address by using a in46_prefix.
Change-Id: I277af191dc611b6bbcb83479f4ae338083740322
---
M ggsn/ggsn.c
M lib/tun.c
M lib/tun.h
3 files changed, 67 insertions(+), 15 deletions(-)
Approvals:
Harald Welte: Looks good to me, approved
Jenkins Builder: Verified
diff --git a/ggsn/ggsn.c b/ggsn/ggsn.c
index 29d8473..ff760cf 100644
--- a/ggsn/ggsn.c
+++ b/ggsn/ggsn.c
@@ -149,6 +149,7 @@
/* actually start the APN with its current config */
int apn_start(struct apn_ctx *apn)
{
+ struct in46_prefix ipv6_tun_linklocal_ip;
if (apn->started)
return 0;
@@ -201,12 +202,13 @@
}
if (apn->cfg.apn_type_mask & (APN_TYPE_IPv6|APN_TYPE_IPv4v6)) {
- if (tun_ipv6_linklocal_get(apn->tun.tun, &apn->v6_lladdr) < 0) {
+ if (tun_ip_local_get(apn->tun.tun, &ipv6_tun_linklocal_ip, 1, IP_TYPE_IPv6_LINK) < 1) {
LOGPAPN(LOGL_ERROR, apn, "Cannot obtain IPv6 link-local address of "
"interface: %s\n", strerror(errno));
apn_stop(apn, false);
return -1;
}
+ apn->v6_lladdr = ipv6_tun_linklocal_ip.addr.v6;
}
/* set back-pointer from TUN device to APN */
diff --git a/lib/tun.c b/lib/tun.c
index 7662146..6bcc13b 100644
--- a/lib/tun.c
+++ b/lib/tun.c
@@ -751,34 +751,73 @@
#include <ifaddrs.h>
-/* obtain the link-local address of the tun device */
-int tun_ipv6_linklocal_get(const struct tun_t *tun, struct in6_addr *ia)
+/*! Obtain the local address of the tun device.
+ * \param[in] tun Target device owning the IP
+ * \param[out] prefix_list List of prefix structures to fill with each IPv4/6 and prefix length found.
+ * \param[in] prefix_size Amount of elements allowed to be fill in the prefix_list array.
+ * \param[in] flags Specify which kind of IP to look for: IP_TYPE_IPv4, IP_TYPE_IPv6_LINK, IP_TYPE_IPv6_NONLINK
+ * \returns The number of ips found following the criteria specified by flags, -1 on error.
+ *
+ * This function will fill prefix_list with up to prefix_size IPs following the
+ * criteria specified by flags parameter. It returns the number of IPs matching
+ * the criteria. As a result, the number returned can be bigger than
+ * prefix_size. It can be used with prefix_size=0 to get an estimate of the size
+ * needed for prefix_list.
+ */
+int tun_ip_local_get(const struct tun_t *tun, struct in46_prefix *prefix_list, size_t prefix_size, int flags)
{
- struct ifaddrs *ifaddr, *ifa;
static const uint8_t ll_prefix[] = { 0xfe,0x80, 0,0, 0,0, 0,0 };
+ struct ifaddrs *ifaddr, *ifa;
+ struct in46_addr netmask;
+ size_t count = 0;
+ bool is_ipv6_ll;
if (getifaddrs(&ifaddr) == -1) {
return -1;
}
for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
- struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) ifa->ifa_addr;
if (ifa->ifa_addr == NULL)
- continue;
-
- if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
if (strcmp(ifa->ifa_name, tun->devname))
continue;
- if (memcmp(sin6->sin6_addr.s6_addr, ll_prefix, sizeof(ll_prefix)))
- continue;
+ if (ifa->ifa_addr->sa_family == AF_INET && (flags & IP_TYPE_IPv4)) {
+ struct sockaddr_in *sin4 = (struct sockaddr_in *) ifa->ifa_addr;
+ struct sockaddr_in *netmask4 = (struct sockaddr_in *) ifa->ifa_netmask;
- *ia = sin6->sin6_addr;
- freeifaddrs(ifaddr);
- return 0;
+ if (count < prefix_size) {
+ netmask.len = sizeof(netmask4->sin_addr);
+ netmask.v4 = netmask4->sin_addr;
+ prefix_list[count].addr.len = sizeof(sin4->sin_addr);
+ prefix_list[count].addr.v4 = sin4->sin_addr;
+ prefix_list[count].prefixlen = in46a_netmasklen(&netmask);
+ }
+ count++;
+ }
+
+ if (ifa->ifa_addr->sa_family == AF_INET6 && (flags & IP_TYPE_IPv6)) {
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) ifa->ifa_addr;
+ struct sockaddr_in6 *netmask6 = (struct sockaddr_in6 *) ifa->ifa_netmask;
+
+ is_ipv6_ll = !memcmp(sin6->sin6_addr.s6_addr, ll_prefix, sizeof(ll_prefix));
+ if ((flags & IP_TYPE_IPv6_NONLINK) && is_ipv6_ll)
+ continue;
+ if ((flags & IP_TYPE_IPv6_LINK) && !is_ipv6_ll)
+ continue;
+
+ if (count < prefix_size) {
+ netmask.len = sizeof(netmask6->sin6_addr);
+ netmask.v6 = netmask6->sin6_addr;
+ prefix_list[count].addr.len = sizeof(sin6->sin6_addr);
+ prefix_list[count].addr.v6 = sin6->sin6_addr;
+ prefix_list[count].prefixlen = in46a_netmasklen(&netmask);
+ }
+ count++;
+ }
}
+
freeifaddrs(ifaddr);
- return -1;
+ return count;
}
diff --git a/lib/tun.h b/lib/tun.h
index f63be50..0b960e5 100644
--- a/lib/tun.h
+++ b/lib/tun.h
@@ -23,6 +23,16 @@
#define TUN_NLBUFSIZE 1024
#include "config.h"
+
+/* ipv6 ip type flags for tun_ipv6_local_get() */
+enum {
+ IP_TYPE_IPv4 = 1,
+ IP_TYPE_IPv6_LINK = 2,
+ IP_TYPE_IPv6_NONLINK = 4,
+};
+#define IP_TYPE_IPv6 (IP_TYPE_IPv6_LINK | IP_TYPE_IPv6_NONLINK)
+
+
#ifndef HAVE_IPHDR
struct iphdr
{
@@ -85,6 +95,7 @@
extern int tun_runscript(struct tun_t *tun, char *script);
-int tun_ipv6_linklocal_get(const struct tun_t *tun, struct in6_addr *ia);
+int tun_ip_local_get(const struct tun_t *tun, struct in46_prefix *prefix_list,
+ size_t prefix_size, int flags);
#endif /* !_TUN_H */
--
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Gerrit-MessageType: merged
Gerrit-Change-Id: I277af191dc611b6bbcb83479f4ae338083740322
Gerrit-PatchSet: 2
Gerrit-Project: osmo-ggsn
Gerrit-Branch: master
Gerrit-Owner: Pau Espin Pedrol <pespin at sysmocom.de>
Gerrit-Reviewer: Harald Welte <laforge at gnumonks.org>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: Pau Espin Pedrol <pespin at sysmocom.de>