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-rw-r--r--fs/afs/Makefile1
-rw-r--r--fs/afs/afs_cm.h3
-rw-r--r--fs/afs/cmservice.c98
-rw-r--r--fs/afs/internal.h42
-rw-r--r--fs/afs/main.c49
-rw-r--r--fs/afs/rxrpc.c39
-rw-r--r--fs/afs/use-rtnetlink.c473
7 files changed, 705 insertions, 0 deletions
diff --git a/fs/afs/Makefile b/fs/afs/Makefile
index cca198b..01545eb 100644
--- a/fs/afs/Makefile
+++ b/fs/afs/Makefile
@@ -18,6 +18,7 @@ kafs-objs := \
security.o \
server.o \
super.o \
+ use-rtnetlink.o \
vlclient.o \
vlocation.o \
vnode.o \
diff --git a/fs/afs/afs_cm.h b/fs/afs/afs_cm.h
index 7c8e3d4..d4bd201 100644
--- a/fs/afs/afs_cm.h
+++ b/fs/afs/afs_cm.h
@@ -23,6 +23,9 @@ enum AFS_CM_Operations {
CBGetCE = 208, /* get cache file description */
CBGetXStatsVersion = 209, /* get version of extended statistics */
CBGetXStats = 210, /* get contents of extended statistics data */
+ CBGetCapabilities = 65538, /* get client capabilities */
};
+#define AFS_CAP_ERROR_TRANSLATION 0x1
+
#endif /* AFS_FS_H */
diff --git a/fs/afs/cmservice.c b/fs/afs/cmservice.c
index c3ec57a..a6af3ac 100644
--- a/fs/afs/cmservice.c
+++ b/fs/afs/cmservice.c
@@ -22,6 +22,8 @@ static int afs_deliver_cb_init_call_back_state(struct afs_call *,
struct sk_buff *, bool);
static int afs_deliver_cb_probe(struct afs_call *, struct sk_buff *, bool);
static int afs_deliver_cb_callback(struct afs_call *, struct sk_buff *, bool);
+static int afs_deliver_cb_get_capabilities(struct afs_call *, struct sk_buff *,
+ bool);
static void afs_cm_destructor(struct afs_call *);
/*
@@ -55,6 +57,16 @@ static const struct afs_call_type afs_SRXCBProbe = {
};
/*
+ * CB.GetCapabilities operation type
+ */
+static const struct afs_call_type afs_SRXCBGetCapabilites = {
+ .name = "CB.GetCapabilities",
+ .deliver = afs_deliver_cb_get_capabilities,
+ .abort_to_error = afs_abort_to_error,
+ .destructor = afs_cm_destructor,
+};
+
+/*
* route an incoming cache manager call
* - return T if supported, F if not
*/
@@ -74,6 +86,9 @@ bool afs_cm_incoming_call(struct afs_call *call)
case CBProbe:
call->type = &afs_SRXCBProbe;
return true;
+ case CBGetCapabilities:
+ call->type = &afs_SRXCBGetCapabilites;
+ return true;
default:
return false;
}
@@ -328,3 +343,86 @@ static int afs_deliver_cb_probe(struct afs_call *call, struct sk_buff *skb,
schedule_work(&call->work);
return 0;
}
+
+/*
+ * allow the fileserver to ask about the cache manager's capabilities
+ */
+static void SRXAFSCB_GetCapabilities(struct work_struct *work)
+{
+ struct afs_interface *ifs;
+ struct afs_call *call = container_of(work, struct afs_call, work);
+ int loop, nifs;
+
+ struct {
+ struct /* InterfaceAddr */ {
+ __be32 nifs;
+ __be32 uuid[11];
+ __be32 ifaddr[32];
+ __be32 netmask[32];
+ __be32 mtu[32];
+ } ia;
+ struct /* Capabilities */ {
+ __be32 capcount;
+ __be32 caps[1];
+ } cap;
+ } reply;
+
+ _enter("");
+
+ nifs = 0;
+ ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
+ if (ifs) {
+ nifs = afs_get_ipv4_interfaces(ifs, 32, false);
+ if (nifs < 0) {
+ kfree(ifs);
+ ifs = NULL;
+ nifs = 0;
+ }
+ }
+
+ memset(&reply, 0, sizeof(reply));
+ reply.ia.nifs = htonl(nifs);
+
+ reply.ia.uuid[0] = htonl(afs_uuid.time_low);
+ reply.ia.uuid[1] = htonl(afs_uuid.time_mid);
+ reply.ia.uuid[2] = htonl(afs_uuid.time_hi_and_version);
+ reply.ia.uuid[3] = htonl((s8) afs_uuid.clock_seq_hi_and_reserved);
+ reply.ia.uuid[4] = htonl((s8) afs_uuid.clock_seq_low);
+ for (loop = 0; loop < 6; loop++)
+ reply.ia.uuid[loop + 5] = htonl((s8) afs_uuid.node[loop]);
+
+ if (ifs) {
+ for (loop = 0; loop < nifs; loop++) {
+ reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
+ reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
+ reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
+ }
+ }
+
+ reply.cap.capcount = htonl(1);
+ reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
+ afs_send_simple_reply(call, &reply, sizeof(reply));
+
+ _leave("");
+}
+
+/*
+ * deliver request data to a CB.GetCapabilities call
+ */
+static int afs_deliver_cb_get_capabilities(struct afs_call *call,
+ struct sk_buff *skb, bool last)
+{
+ _enter(",{%u},%d", skb->len, last);
+
+ if (skb->len > 0)
+ return -EBADMSG;
+ if (!last)
+ return 0;
+
+ /* no unmarshalling required */
+ call->state = AFS_CALL_REPLYING;
+
+ INIT_WORK(&call->work, SRXAFSCB_GetCapabilities);
+ schedule_work(&call->work);
+ return 0;
+}
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 8bed242..6120d4b 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -346,6 +346,40 @@ struct afs_permits {
struct afs_permit permits[0]; /* the permits so far examined */
};
+/*
+ * record of one of a system's set of network interfaces
+ */
+struct afs_interface {
+ unsigned index; /* interface index */
+ struct in_addr address; /* IPv4 address bound to interface */
+ struct in_addr netmask; /* netmask applied to address */
+ unsigned mtu; /* MTU of interface */
+};
+
+/*
+ * UUID definition [internet draft]
+ * - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns
+ * increments since midnight 15th October 1582
+ * - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID
+ * time
+ * - the clock sequence is a 14-bit counter to avoid duplicate times
+ */
+struct afs_uuid {
+ u32 time_low; /* low part of timestamp */
+ u16 time_mid; /* mid part of timestamp */
+ u16 time_hi_and_version; /* high part of timestamp and version */
+#define AFS_UUID_TO_UNIX_TIME 0x01b21dd213814000
+#define AFS_UUID_TIMEHI_MASK 0x0fff
+#define AFS_UUID_VERSION_TIME 0x1000 /* time-based UUID */
+#define AFS_UUID_VERSION_NAME 0x3000 /* name-based UUID */
+#define AFS_UUID_VERSION_RANDOM 0x4000 /* (pseudo-)random generated UUID */
+ u8 clock_seq_hi_and_reserved; /* clock seq hi and variant */
+#define AFS_UUID_CLOCKHI_MASK 0x3f
+#define AFS_UUID_VARIANT_STD 0x80
+ u8 clock_seq_low; /* clock seq low */
+ u8 node[6]; /* spatially unique node ID (MAC addr) */
+};
+
/*****************************************************************************/
/*
* callback.c
@@ -430,6 +464,7 @@ extern void afs_clear_inode(struct inode *);
/*
* main.c
*/
+extern struct afs_uuid afs_uuid;
#ifdef AFS_CACHING_SUPPORT
extern struct cachefs_netfs afs_cache_netfs;
#endif
@@ -470,6 +505,7 @@ extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *,
extern void afs_flat_call_destructor(struct afs_call *);
extern void afs_transfer_reply(struct afs_call *, struct sk_buff *);
extern void afs_send_empty_reply(struct afs_call *);
+extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *,
size_t);
@@ -501,6 +537,12 @@ extern int afs_fs_init(void);
extern void afs_fs_exit(void);
/*
+ * use-rtnetlink.c
+ */
+extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool);
+extern int afs_get_MAC_address(u8 [6]);
+
+/*
* vlclient.c
*/
#ifdef AFS_CACHING_SUPPORT
diff --git a/fs/afs/main.c b/fs/afs/main.c
index 0cf1b02..40c2704 100644
--- a/fs/afs/main.c
+++ b/fs/afs/main.c
@@ -40,6 +40,51 @@ struct cachefs_netfs afs_cache_netfs = {
};
#endif
+struct afs_uuid afs_uuid;
+
+/*
+ * get a client UUID
+ */
+static int __init afs_get_client_UUID(void)
+{
+ struct timespec ts;
+ u64 uuidtime;
+ u16 clockseq;
+ int ret;
+
+ /* read the MAC address of one of the external interfaces and construct
+ * a UUID from it */
+ ret = afs_get_MAC_address(afs_uuid.node);
+ if (ret < 0)
+ return ret;
+
+ getnstimeofday(&ts);
+ uuidtime = (u64) ts.tv_sec * 1000 * 1000 * 10;
+ uuidtime += ts.tv_nsec / 100;
+ uuidtime += AFS_UUID_TO_UNIX_TIME;
+ afs_uuid.time_low = uuidtime;
+ afs_uuid.time_mid = uuidtime >> 32;
+ afs_uuid.time_hi_and_version = (uuidtime >> 48) & AFS_UUID_TIMEHI_MASK;
+ afs_uuid.time_hi_and_version = AFS_UUID_VERSION_TIME;
+
+ get_random_bytes(&clockseq, 2);
+ afs_uuid.clock_seq_low = clockseq;
+ afs_uuid.clock_seq_hi_and_reserved =
+ (clockseq >> 8) & AFS_UUID_CLOCKHI_MASK;
+ afs_uuid.clock_seq_hi_and_reserved = AFS_UUID_VARIANT_STD;
+
+ _debug("AFS UUID: %08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
+ afs_uuid.time_low,
+ afs_uuid.time_mid,
+ afs_uuid.time_hi_and_version,
+ afs_uuid.clock_seq_hi_and_reserved,
+ afs_uuid.clock_seq_low,
+ afs_uuid.node[0], afs_uuid.node[1], afs_uuid.node[2],
+ afs_uuid.node[3], afs_uuid.node[4], afs_uuid.node[5]);
+
+ return 0;
+}
+
/*
* initialise the AFS client FS module
*/
@@ -49,6 +94,10 @@ static int __init afs_init(void)
printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
+ ret = afs_get_client_UUID();
+ if (ret < 0)
+ return ret;
+
/* register the /proc stuff */
ret = afs_proc_init();
if (ret < 0)
diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index e86c527..e7b0473 100644
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -714,6 +714,45 @@ void afs_send_empty_reply(struct afs_call *call)
}
/*
+ * send a simple reply
+ */
+void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len)
+{
+ struct msghdr msg;
+ struct iovec iov[1];
+
+ _enter("");
+
+ iov[0].iov_base = (void *) buf;
+ iov[0].iov_len = len;
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ msg.msg_iov = iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ call->state = AFS_CALL_AWAIT_ACK;
+ switch (rxrpc_kernel_send_data(call->rxcall, &msg, len)) {
+ case 0:
+ _leave(" [replied]");
+ return;
+
+ case -ENOMEM:
+ _debug("oom");
+ rxrpc_kernel_abort_call(call->rxcall, RX_USER_ABORT);
+ default:
+ rxrpc_kernel_end_call(call->rxcall);
+ call->rxcall = NULL;
+ call->type->destructor(call);
+ afs_free_call(call);
+ _leave(" [error]");
+ return;
+ }
+}
+
+/*
* extract a piece of data from the received data socket buffers
*/
int afs_extract_data(struct afs_call *call, struct sk_buff *skb,
diff --git a/fs/afs/use-rtnetlink.c b/fs/afs/use-rtnetlink.c
new file mode 100644
index 0000000..82f0daa
--- /dev/null
+++ b/fs/afs/use-rtnetlink.c
@@ -0,0 +1,473 @@
+/* RTNETLINK client
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <linux/if_addr.h>
+#include <linux/if_arp.h>
+#include <linux/inetdevice.h>
+#include <net/netlink.h>
+#include "internal.h"
+
+struct afs_rtm_desc {
+ struct socket *nlsock;
+ struct afs_interface *bufs;
+ u8 *mac;
+ size_t nbufs;
+ size_t maxbufs;
+ void *data;
+ ssize_t datalen;
+ size_t datamax;
+ int msg_seq;
+ unsigned mac_index;
+ bool wantloopback;
+ int (*parse)(struct afs_rtm_desc *, struct nlmsghdr *);
+};
+
+/*
+ * parse an RTM_GETADDR response
+ */
+static int afs_rtm_getaddr_parse(struct afs_rtm_desc *desc,
+ struct nlmsghdr *nlhdr)
+{
+ struct afs_interface *this;
+ struct ifaddrmsg *ifa;
+ struct rtattr *rtattr;
+ const char *name;
+ size_t len;
+
+ ifa = (struct ifaddrmsg *) NLMSG_DATA(nlhdr);
+
+ _enter("{ix=%d,af=%d}", ifa->ifa_index, ifa->ifa_family);
+
+ if (ifa->ifa_family != AF_INET) {
+ _leave(" = 0 [family %d]", ifa->ifa_family);
+ return 0;
+ }
+ if (desc->nbufs >= desc->maxbufs) {
+ _leave(" = 0 [max %zu/%zu]", desc->nbufs, desc->maxbufs);
+ return 0;
+ }
+
+ this = &desc->bufs[desc->nbufs];
+
+ this->index = ifa->ifa_index;
+ this->netmask.s_addr = inet_make_mask(ifa->ifa_prefixlen);
+ this->mtu = 0;
+
+ rtattr = NLMSG_DATA(nlhdr) + NLMSG_ALIGN(sizeof(struct ifaddrmsg));
+ len = NLMSG_PAYLOAD(nlhdr, sizeof(struct ifaddrmsg));
+
+ name = "unknown";
+ for (; RTA_OK(rtattr, len); rtattr = RTA_NEXT(rtattr, len)) {
+ switch (rtattr->rta_type) {
+ case IFA_ADDRESS:
+ memcpy(&this->address, RTA_DATA(rtattr), 4);
+ break;
+ case IFA_LABEL:
+ name = RTA_DATA(rtattr);
+ break;
+ }
+ }
+
+ _debug("%s: "NIPQUAD_FMT"/"NIPQUAD_FMT,
+ name, NIPQUAD(this->address), NIPQUAD(this->netmask));
+
+ desc->nbufs++;
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * parse an RTM_GETLINK response for MTUs
+ */
+static int afs_rtm_getlink_if_parse(struct afs_rtm_desc *desc,
+ struct nlmsghdr *nlhdr)
+{
+ struct afs_interface *this;
+ struct ifinfomsg *ifi;
+ struct rtattr *rtattr;
+ const char *name;
+ size_t len, loop;
+
+ ifi = (struct ifinfomsg *) NLMSG_DATA(nlhdr);
+
+ _enter("{ix=%d}", ifi->ifi_index);
+
+ for (loop = 0; loop < desc->nbufs; loop++) {
+ this = &desc->bufs[loop];
+ if (this->index == ifi->ifi_index)
+ goto found;
+ }
+
+ _leave(" = 0 [no match]");
+ return 0;
+
+found:
+ if (ifi->ifi_type == ARPHRD_LOOPBACK && !desc->wantloopback) {
+ _leave(" = 0 [loopback]");
+ return 0;
+ }
+
+ rtattr = NLMSG_DATA(nlhdr) + NLMSG_ALIGN(sizeof(struct ifinfomsg));
+ len = NLMSG_PAYLOAD(nlhdr, sizeof(struct ifinfomsg));
+
+ name = "unknown";
+ for (; RTA_OK(rtattr, len); rtattr = RTA_NEXT(rtattr, len)) {
+ switch (rtattr->rta_type) {
+ case IFLA_MTU:
+ memcpy(&this->mtu, RTA_DATA(rtattr), 4);
+ break;
+ case IFLA_IFNAME:
+ name = RTA_DATA(rtattr);
+ break;
+ }
+ }
+
+ _debug("%s: "NIPQUAD_FMT"/"NIPQUAD_FMT" mtu %u",
+ name, NIPQUAD(this->address), NIPQUAD(this->netmask),
+ this->mtu);
+
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * parse an RTM_GETLINK response for the MAC address belonging to the lowest
+ * non-internal interface
+ */
+static int afs_rtm_getlink_mac_parse(struct afs_rtm_desc *desc,
+ struct nlmsghdr *nlhdr)
+{
+ struct ifinfomsg *ifi;
+ struct rtattr *rtattr;
+ const char *name;
+ size_t remain, len;
+ bool set;
+
+ ifi = (struct ifinfomsg *) NLMSG_DATA(nlhdr);
+
+ _enter("{ix=%d}", ifi->ifi_index);
+
+ if (ifi->ifi_index >= desc->mac_index) {
+ _leave(" = 0 [high]");
+ return 0;
+ }
+ if (ifi->ifi_type == ARPHRD_LOOPBACK) {
+ _leave(" = 0 [loopback]");
+ return 0;
+ }
+
+ rtattr = NLMSG_DATA(nlhdr) + NLMSG_ALIGN(sizeof(struct ifinfomsg));
+ remain = NLMSG_PAYLOAD(nlhdr, sizeof(struct ifinfomsg));
+
+ name = "unknown";
+ set = false;
+ for (; RTA_OK(rtattr, remain); rtattr = RTA_NEXT(rtattr, remain)) {
+ switch (rtattr->rta_type) {
+ case IFLA_ADDRESS:
+ len = RTA_PAYLOAD(rtattr);
+ memcpy(desc->mac, RTA_DATA(rtattr),
+ min_t(size_t, len, 6));
+ desc->mac_index = ifi->ifi_index;
+ set = true;
+ break;
+ case IFLA_IFNAME:
+ name = RTA_DATA(rtattr);
+ break;
+ }
+ }
+
+ if (set)
+ _debug("%s: %02x:%02x:%02x:%02x:%02x:%02x",
+ name,
+ desc->mac[0], desc->mac[1], desc->mac[2],
+ desc->mac[3], desc->mac[4], desc->mac[5]);
+
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * read the rtnetlink response and pass to parsing routine
+ */
+static int afs_read_rtm(struct afs_rtm_desc *desc)
+{
+ struct nlmsghdr *nlhdr, tmphdr;
+ struct msghdr msg;
+ struct kvec iov[1];
+ void *data;
+ bool last = false;
+ int len, ret, remain;
+
+ _enter("");
+
+ do {
+ /* first of all peek to see how big the packet is */
+ memset(&msg, 0, sizeof(msg));
+ iov[0].iov_base = &tmphdr;
+ iov[0].iov_len = sizeof(tmphdr);
+ len = kernel_recvmsg(desc->nlsock, &msg, iov, 1,
+ sizeof(tmphdr), MSG_PEEK | MSG_TRUNC);
+ if (len < 0) {
+ _leave(" = %d [peek]", len);
+ return len;
+ }
+ if (len == 0)
+ continue;
+ if (len < sizeof(tmphdr) || len < NLMSG_PAYLOAD(&tmphdr, 0)) {
+ _leave(" = -EMSGSIZE");
+ return -EMSGSIZE;
+ }
+
+ if (desc->datamax < len) {
+ kfree(desc->data);
+ desc->data = NULL;
+ data = kmalloc(len, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+ desc->data = data;
+ }
+ desc->datamax = len;
+
+ /* read all the data from this packet */
+ iov[0].iov_base = desc->data;
+ iov[0].iov_len = desc->datamax;
+ desc->datalen = kernel_recvmsg(desc->nlsock, &msg, iov, 1,
+ desc->datamax, 0);
+ if (desc->datalen < 0) {
+ _leave(" = %ld [recv]", desc->datalen);
+ return desc->datalen;
+ }
+
+ nlhdr = desc->data;
+
+ /* check if the header is valid */
+ if (!NLMSG_OK(nlhdr, desc->datalen) ||
+ nlhdr->nlmsg_type == NLMSG_ERROR) {
+ _leave(" = -EIO");
+ return -EIO;
+ }
+
+ /* see if this is the last message */
+ if (nlhdr->nlmsg_type == NLMSG_DONE ||
+ !(nlhdr->nlmsg_flags & NLM_F_MULTI))
+ last = true;
+
+ /* parse the bits we got this time */
+ nlmsg_for_each_msg(nlhdr, desc->data, desc->datalen, remain) {
+ ret = desc->parse(desc, nlhdr);
+ if (ret < 0) {
+ _leave(" = %d [parse]", ret);
+ return ret;
+ }
+ }
+
+ } while (!last);
+
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * list the interface bound addresses to get the address and netmask
+ */
+static int afs_rtm_getaddr(struct afs_rtm_desc *desc)
+{
+ struct msghdr msg;
+ struct kvec iov[1];
+ int ret;
+
+ struct {
+ struct nlmsghdr nl_msg __attribute__((aligned(NLMSG_ALIGNTO)));
+ struct ifaddrmsg addr_msg __attribute__((aligned(NLMSG_ALIGNTO)));
+ } request;
+
+ _enter("");
+
+ memset(&request, 0, sizeof(request));
+
+ request.nl_msg.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
+ request.nl_msg.nlmsg_type = RTM_GETADDR;
+ request.nl_msg.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
+ request.nl_msg.nlmsg_seq = desc->msg_seq++;
+ request.nl_msg.nlmsg_pid = 0;
+
+ memset(&msg, 0, sizeof(msg));
+ iov[0].iov_base = &request;
+ iov[0].iov_len = sizeof(request);
+
+ ret = kernel_sendmsg(desc->nlsock, &msg, iov, 1, iov[0].iov_len);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * list the interface link statuses to get the MTUs
+ */
+static int afs_rtm_getlink(struct afs_rtm_desc *desc)
+{
+ struct msghdr msg;
+ struct kvec iov[1];
+ int ret;
+
+ struct {
+ struct nlmsghdr nl_msg __attribute__((aligned(NLMSG_ALIGNTO)));
+ struct ifinfomsg link_msg __attribute__((aligned(NLMSG_ALIGNTO)));
+ } request;
+
+ _enter("");
+
+ memset(&request, 0, sizeof(request));
+
+ request.nl_msg.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+ request.nl_msg.nlmsg_type = RTM_GETLINK;
+ request.nl_msg.nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT;
+ request.nl_msg.nlmsg_seq = desc->msg_seq++;
+ request.nl_msg.nlmsg_pid = 0;
+
+ memset(&msg, 0, sizeof(msg));
+ iov[0].iov_base = &request;
+ iov[0].iov_len = sizeof(request);
+
+ ret = kernel_sendmsg(desc->nlsock, &msg, iov, 1, iov[0].iov_len);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * cull any interface records for which there isn't an MTU value
+ */
+static void afs_cull_interfaces(struct afs_rtm_desc *desc)
+{
+ struct afs_interface *bufs = desc->bufs;
+ size_t nbufs = desc->nbufs;
+ int loop, point = 0;
+
+ _enter("{%zu}", nbufs);
+
+ for (loop = 0; loop < nbufs; loop++) {
+ if (desc->bufs[loop].mtu != 0) {
+ if (loop != point) {
+ ASSERTCMP(loop, >, point);
+ bufs[point] = bufs[loop];
+ }
+ point++;
+ }
+ }
+
+ desc->nbufs = point;
+ _leave(" [%zu/%zu]", desc->nbufs, nbufs);
+}
+
+/*
+ * get a list of this system's interface IPv4 addresses, netmasks and MTUs
+ * - returns the number of interface records in the buffer
+ */
+int afs_get_ipv4_interfaces(struct afs_interface *bufs, size_t maxbufs,
+ bool wantloopback)
+{
+ struct afs_rtm_desc desc;
+ int ret, loop;
+
+ _enter("");
+
+ memset(&desc, 0, sizeof(desc));
+ desc.bufs = bufs;
+ desc.maxbufs = maxbufs;
+ desc.wantloopback = wantloopback;
+
+ ret = sock_create_kern(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE,
+ &desc.nlsock);
+ if (ret < 0) {
+ _leave(" = %d [sock]", ret);
+ return ret;
+ }
+
+ /* issue RTM_GETADDR */
+ desc.parse = afs_rtm_getaddr_parse;
+ ret = afs_rtm_getaddr(&desc);
+ if (ret < 0)
+ goto error;
+ ret = afs_read_rtm(&desc);
+ if (ret < 0)
+ goto error;
+
+ /* issue RTM_GETLINK */
+ desc.parse = afs_rtm_getlink_if_parse;
+ ret = afs_rtm_getlink(&desc);
+ if (ret < 0)
+ goto error;
+ ret = afs_read_rtm(&desc);
+ if (ret < 0)
+ goto error;
+
+ afs_cull_interfaces(&desc);
+ ret = desc.nbufs;
+
+ for (loop = 0; loop < ret; loop++)
+ _debug("[%d] "NIPQUAD_FMT"/"NIPQUAD_FMT" mtu %u",
+ bufs[loop].index,
+ NIPQUAD(bufs[loop].address),
+ NIPQUAD(bufs[loop].netmask),
+ bufs[loop].mtu);
+
+error:
+ kfree(desc.data);
+ sock_release(desc.nlsock);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * get a MAC address from a random ethernet interface that has a real one
+ * - the buffer should be 6 bytes in size
+ */
+int afs_get_MAC_address(u8 mac[6])
+{
+ struct afs_rtm_desc desc;
+ int ret;
+
+ _enter("");
+
+ memset(&desc, 0, sizeof(desc));
+ desc.mac = mac;
+ desc.mac_index = UINT_MAX;
+
+ ret = sock_create_kern(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE,
+ &desc.nlsock);
+ if (ret < 0) {
+ _leave(" = %d [sock]", ret);
+ return ret;
+ }
+
+ /* issue RTM_GETLINK */
+ desc.parse = afs_rtm_getlink_mac_parse;
+ ret = afs_rtm_getlink(&desc);
+ if (ret < 0)
+ goto error;
+ ret = afs_read_rtm(&desc);
+ if (ret < 0)
+ goto error;
+
+ if (desc.mac_index < UINT_MAX) {
+ /* got a MAC address */
+ _debug("[%d] %02x:%02x:%02x:%02x:%02x:%02x",
+ desc.mac_index,
+ mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+ } else {
+ ret = -ENONET;
+ }
+
+error:
+ sock_release(desc.nlsock);
+ _leave(" = %d", ret);
+ return ret;
+}
generated by cgit v1.1 at 2024-12-26 18:31:54 +0000