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-rw-r--r--net/ipv4/inet_diag.c868
1 files changed, 868 insertions, 0 deletions
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
new file mode 100644
index 00000000000..71f3c7350c6
--- /dev/null
+++ b/net/ipv4/inet_diag.c
@@ -0,0 +1,868 @@
+/*
+ * inet_diag.c Module for monitoring INET transport protocols sockets.
+ *
+ * Version: $Id: inet_diag.c,v 1.3 2002/02/01 22:01:04 davem Exp $
+ *
+ * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ * 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/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/random.h>
+#include <linux/cache.h>
+#include <linux/init.h>
+#include <linux/time.h>
+
+#include <net/icmp.h>
+#include <net/tcp.h>
+#include <net/ipv6.h>
+#include <net/inet_common.h>
+#include <net/inet_connection_sock.h>
+#include <net/inet_hashtables.h>
+#include <net/inet_timewait_sock.h>
+#include <net/inet6_hashtables.h>
+
+#include <linux/inet.h>
+#include <linux/stddef.h>
+
+#include <linux/inet_diag.h>
+
+static const struct inet_diag_handler **inet_diag_table;
+
+struct inet_diag_entry {
+ u32 *saddr;
+ u32 *daddr;
+ u16 sport;
+ u16 dport;
+ u16 family;
+ u16 userlocks;
+};
+
+static struct sock *idiagnl;
+
+#define INET_DIAG_PUT(skb, attrtype, attrlen) \
+ RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
+
+static int inet_diag_fill(struct sk_buff *skb, struct sock *sk,
+ int ext, u32 pid, u32 seq, u16 nlmsg_flags,
+ const struct nlmsghdr *unlh)
+{
+ const struct inet_sock *inet = inet_sk(sk);
+ const struct inet_connection_sock *icsk = inet_csk(sk);
+ struct inet_diag_msg *r;
+ struct nlmsghdr *nlh;
+ void *info = NULL;
+ struct inet_diag_meminfo *minfo = NULL;
+ unsigned char *b = skb->tail;
+ const struct inet_diag_handler *handler;
+
+ handler = inet_diag_table[unlh->nlmsg_type];
+ BUG_ON(handler == NULL);
+
+ nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
+ nlh->nlmsg_flags = nlmsg_flags;
+
+ r = NLMSG_DATA(nlh);
+ if (sk->sk_state != TCP_TIME_WAIT) {
+ if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
+ minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO,
+ sizeof(*minfo));
+ if (ext & (1 << (INET_DIAG_INFO - 1)))
+ info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
+ handler->idiag_info_size);
+
+ if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
+ size_t len = strlen(icsk->icsk_ca_ops->name);
+ strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
+ icsk->icsk_ca_ops->name);
+ }
+ }
+ r->idiag_family = sk->sk_family;
+ r->idiag_state = sk->sk_state;
+ r->idiag_timer = 0;
+ r->idiag_retrans = 0;
+
+ r->id.idiag_if = sk->sk_bound_dev_if;
+ r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
+ r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
+
+ if (r->idiag_state == TCP_TIME_WAIT) {
+ const struct inet_timewait_sock *tw = inet_twsk(sk);
+ long tmo = tw->tw_ttd - jiffies;
+ if (tmo < 0)
+ tmo = 0;
+
+ r->id.idiag_sport = tw->tw_sport;
+ r->id.idiag_dport = tw->tw_dport;
+ r->id.idiag_src[0] = tw->tw_rcv_saddr;
+ r->id.idiag_dst[0] = tw->tw_daddr;
+ r->idiag_state = tw->tw_substate;
+ r->idiag_timer = 3;
+ r->idiag_expires = (tmo * 1000 + HZ - 1) / HZ;
+ r->idiag_rqueue = 0;
+ r->idiag_wqueue = 0;
+ r->idiag_uid = 0;
+ r->idiag_inode = 0;
+#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
+ if (r->idiag_family == AF_INET6) {
+ const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk);
+
+ ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
+ &tcp6tw->tw_v6_rcv_saddr);
+ ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
+ &tcp6tw->tw_v6_daddr);
+ }
+#endif
+ nlh->nlmsg_len = skb->tail - b;
+ return skb->len;
+ }
+
+ r->id.idiag_sport = inet->sport;
+ r->id.idiag_dport = inet->dport;
+ r->id.idiag_src[0] = inet->rcv_saddr;
+ r->id.idiag_dst[0] = inet->daddr;
+
+#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
+ if (r->idiag_family == AF_INET6) {
+ struct ipv6_pinfo *np = inet6_sk(sk);
+
+ ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
+ &np->rcv_saddr);
+ ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
+ &np->daddr);
+ }
+#endif
+
+#define EXPIRES_IN_MS(tmo) ((tmo - jiffies) * 1000 + HZ - 1) / HZ
+
+ if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
+ r->idiag_timer = 1;
+ r->idiag_retrans = icsk->icsk_retransmits;
+ r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
+ } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
+ r->idiag_timer = 4;
+ r->idiag_retrans = icsk->icsk_probes_out;
+ r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
+ } else if (timer_pending(&sk->sk_timer)) {
+ r->idiag_timer = 2;
+ r->idiag_retrans = icsk->icsk_probes_out;
+ r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
+ } else {
+ r->idiag_timer = 0;
+ r->idiag_expires = 0;
+ }
+#undef EXPIRES_IN_MS
+
+ r->idiag_uid = sock_i_uid(sk);
+ r->idiag_inode = sock_i_ino(sk);
+
+ if (minfo) {
+ minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc);
+ minfo->idiag_wmem = sk->sk_wmem_queued;
+ minfo->idiag_fmem = sk->sk_forward_alloc;
+ minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc);
+ }
+
+ handler->idiag_get_info(sk, r, info);
+
+ if (sk->sk_state < TCP_TIME_WAIT &&
+ icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
+ icsk->icsk_ca_ops->get_info(sk, ext, skb);
+
+ nlh->nlmsg_len = skb->tail - b;
+ return skb->len;
+
+rtattr_failure:
+nlmsg_failure:
+ skb_trim(skb, b - skb->data);
+ return -1;
+}
+
+static int inet_diag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh)
+{
+ int err;
+ struct sock *sk;
+ struct inet_diag_req *req = NLMSG_DATA(nlh);
+ struct sk_buff *rep;
+ struct inet_hashinfo *hashinfo;
+ const struct inet_diag_handler *handler;
+
+ handler = inet_diag_table[nlh->nlmsg_type];
+ BUG_ON(handler == NULL);
+ hashinfo = handler->idiag_hashinfo;
+
+ if (req->idiag_family == AF_INET) {
+ sk = inet_lookup(hashinfo, req->id.idiag_dst[0],
+ req->id.idiag_dport, req->id.idiag_src[0],
+ req->id.idiag_sport, req->id.idiag_if);
+ }
+#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
+ else if (req->idiag_family == AF_INET6) {
+ sk = inet6_lookup(hashinfo,
+ (struct in6_addr *)req->id.idiag_dst,
+ req->id.idiag_dport,
+ (struct in6_addr *)req->id.idiag_src,
+ req->id.idiag_sport,
+ req->id.idiag_if);
+ }
+#endif
+ else {
+ return -EINVAL;
+ }
+
+ if (sk == NULL)
+ return -ENOENT;
+
+ err = -ESTALE;
+ if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
+ req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
+ ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
+ (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
+ goto out;
+
+ err = -ENOMEM;
+ rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
+ sizeof(struct inet_diag_meminfo) +
+ handler->idiag_info_size + 64)),
+ GFP_KERNEL);
+ if (!rep)
+ goto out;
+
+ if (inet_diag_fill(rep, sk, req->idiag_ext,
+ NETLINK_CB(in_skb).pid,
+ nlh->nlmsg_seq, 0, nlh) <= 0)
+ BUG();
+
+ err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
+ MSG_DONTWAIT);
+ if (err > 0)
+ err = 0;
+
+out:
+ if (sk) {
+ if (sk->sk_state == TCP_TIME_WAIT)
+ inet_twsk_put((struct inet_timewait_sock *)sk);
+ else
+ sock_put(sk);
+ }
+ return err;
+}
+
+static int bitstring_match(const u32 *a1, const u32 *a2, int bits)
+{
+ int words = bits >> 5;
+
+ bits &= 0x1f;
+
+ if (words) {
+ if (memcmp(a1, a2, words << 2))
+ return 0;
+ }
+ if (bits) {
+ __u32 w1, w2;
+ __u32 mask;
+
+ w1 = a1[words];
+ w2 = a2[words];
+
+ mask = htonl((0xffffffff) << (32 - bits));
+
+ if ((w1 ^ w2) & mask)
+ return 0;
+ }
+
+ return 1;
+}
+
+
+static int inet_diag_bc_run(const void *bc, int len,
+ const struct inet_diag_entry *entry)
+{
+ while (len > 0) {
+ int yes = 1;
+ const struct inet_diag_bc_op *op = bc;
+
+ switch (op->code) {
+ case INET_DIAG_BC_NOP:
+ break;
+ case INET_DIAG_BC_JMP:
+ yes = 0;
+ break;
+ case INET_DIAG_BC_S_GE:
+ yes = entry->sport >= op[1].no;
+ break;
+ case INET_DIAG_BC_S_LE:
+ yes = entry->dport <= op[1].no;
+ break;
+ case INET_DIAG_BC_D_GE:
+ yes = entry->dport >= op[1].no;
+ break;
+ case INET_DIAG_BC_D_LE:
+ yes = entry->dport <= op[1].no;
+ break;
+ case INET_DIAG_BC_AUTO:
+ yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
+ break;
+ case INET_DIAG_BC_S_COND:
+ case INET_DIAG_BC_D_COND: {
+ struct inet_diag_hostcond *cond;
+ u32 *addr;
+
+ cond = (struct inet_diag_hostcond *)(op + 1);
+ if (cond->port != -1 &&
+ cond->port != (op->code == INET_DIAG_BC_S_COND ?
+ entry->sport : entry->dport)) {
+ yes = 0;
+ break;
+ }
+
+ if (cond->prefix_len == 0)
+ break;
+
+ if (op->code == INET_DIAG_BC_S_COND)
+ addr = entry->saddr;
+ else
+ addr = entry->daddr;
+
+ if (bitstring_match(addr, cond->addr, cond->prefix_len))
+ break;
+ if (entry->family == AF_INET6 &&
+ cond->family == AF_INET) {
+ if (addr[0] == 0 && addr[1] == 0 &&
+ addr[2] == htonl(0xffff) &&
+ bitstring_match(addr + 3, cond->addr,
+ cond->prefix_len))
+ break;
+ }
+ yes = 0;
+ break;
+ }
+ }
+
+ if (yes) {
+ len -= op->yes;
+ bc += op->yes;
+ } else {
+ len -= op->no;
+ bc += op->no;
+ }
+ }
+ return (len == 0);
+}
+
+static int valid_cc(const void *bc, int len, int cc)
+{
+ while (len >= 0) {
+ const struct inet_diag_bc_op *op = bc;
+
+ if (cc > len)
+ return 0;
+ if (cc == len)
+ return 1;
+ if (op->yes < 4)
+ return 0;
+ len -= op->yes;
+ bc += op->yes;
+ }
+ return 0;
+}
+
+static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
+{
+ const unsigned char *bc = bytecode;
+ int len = bytecode_len;
+
+ while (len > 0) {
+ struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
+
+//printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
+ switch (op->code) {
+ case INET_DIAG_BC_AUTO:
+ case INET_DIAG_BC_S_COND:
+ case INET_DIAG_BC_D_COND:
+ case INET_DIAG_BC_S_GE:
+ case INET_DIAG_BC_S_LE:
+ case INET_DIAG_BC_D_GE:
+ case INET_DIAG_BC_D_LE:
+ if (op->yes < 4 || op->yes > len + 4)
+ return -EINVAL;
+ case INET_DIAG_BC_JMP:
+ if (op->no < 4 || op->no > len + 4)
+ return -EINVAL;
+ if (op->no < len &&
+ !valid_cc(bytecode, bytecode_len, len - op->no))
+ return -EINVAL;
+ break;
+ case INET_DIAG_BC_NOP:
+ if (op->yes < 4 || op->yes > len + 4)
+ return -EINVAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+ bc += op->yes;
+ len -= op->yes;
+ }
+ return len == 0 ? 0 : -EINVAL;
+}
+
+static int inet_diag_dump_sock(struct sk_buff *skb, struct sock *sk,
+ struct netlink_callback *cb)
+{
+ struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
+
+ if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
+ struct inet_diag_entry entry;
+ struct rtattr *bc = (struct rtattr *)(r + 1);
+ struct inet_sock *inet = inet_sk(sk);
+
+ entry.family = sk->sk_family;
+#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
+ if (entry.family == AF_INET6) {
+ struct ipv6_pinfo *np = inet6_sk(sk);
+
+ entry.saddr = np->rcv_saddr.s6_addr32;
+ entry.daddr = np->daddr.s6_addr32;
+ } else
+#endif
+ {
+ entry.saddr = &inet->rcv_saddr;
+ entry.daddr = &inet->daddr;
+ }
+ entry.sport = inet->num;
+ entry.dport = ntohs(inet->dport);
+ entry.userlocks = sk->sk_userlocks;
+
+ if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
+ return 0;
+ }
+
+ return inet_diag_fill(skb, sk, r->idiag_ext, NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
+}
+
+static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
+ struct request_sock *req,
+ u32 pid, u32 seq,
+ const struct nlmsghdr *unlh)
+{
+ const struct inet_request_sock *ireq = inet_rsk(req);
+ struct inet_sock *inet = inet_sk(sk);
+ unsigned char *b = skb->tail;
+ struct inet_diag_msg *r;
+ struct nlmsghdr *nlh;
+ long tmo;
+
+ nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
+ nlh->nlmsg_flags = NLM_F_MULTI;
+ r = NLMSG_DATA(nlh);
+
+ r->idiag_family = sk->sk_family;
+ r->idiag_state = TCP_SYN_RECV;
+ r->idiag_timer = 1;
+ r->idiag_retrans = req->retrans;
+
+ r->id.idiag_if = sk->sk_bound_dev_if;
+ r->id.idiag_cookie[0] = (u32)(unsigned long)req;
+ r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
+
+ tmo = req->expires - jiffies;
+ if (tmo < 0)
+ tmo = 0;
+
+ r->id.idiag_sport = inet->sport;
+ r->id.idiag_dport = ireq->rmt_port;
+ r->id.idiag_src[0] = ireq->loc_addr;
+ r->id.idiag_dst[0] = ireq->rmt_addr;
+ r->idiag_expires = jiffies_to_msecs(tmo);
+ r->idiag_rqueue = 0;
+ r->idiag_wqueue = 0;
+ r->idiag_uid = sock_i_uid(sk);
+ r->idiag_inode = 0;
+#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
+ if (r->idiag_family == AF_INET6) {
+ ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
+ &tcp6_rsk(req)->loc_addr);
+ ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
+ &tcp6_rsk(req)->rmt_addr);
+ }
+#endif
+ nlh->nlmsg_len = skb->tail - b;
+
+ return skb->len;
+
+nlmsg_failure:
+ skb_trim(skb, b - skb->data);
+ return -1;
+}
+
+static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
+ struct netlink_callback *cb)
+{
+ struct inet_diag_entry entry;
+ struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
+ struct inet_connection_sock *icsk = inet_csk(sk);
+ struct listen_sock *lopt;
+ struct rtattr *bc = NULL;
+ struct inet_sock *inet = inet_sk(sk);
+ int j, s_j;
+ int reqnum, s_reqnum;
+ int err = 0;
+
+ s_j = cb->args[3];
+ s_reqnum = cb->args[4];
+
+ if (s_j > 0)
+ s_j--;
+
+ entry.family = sk->sk_family;
+
+ read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
+
+ lopt = icsk->icsk_accept_queue.listen_opt;
+ if (!lopt || !lopt->qlen)
+ goto out;
+
+ if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
+ bc = (struct rtattr *)(r + 1);
+ entry.sport = inet->num;
+ entry.userlocks = sk->sk_userlocks;
+ }
+
+ for (j = s_j; j < lopt->nr_table_entries; j++) {
+ struct request_sock *req, *head = lopt->syn_table[j];
+
+ reqnum = 0;
+ for (req = head; req; reqnum++, req = req->dl_next) {
+ struct inet_request_sock *ireq = inet_rsk(req);
+
+ if (reqnum < s_reqnum)
+ continue;
+ if (r->id.idiag_dport != ireq->rmt_port &&
+ r->id.idiag_dport)
+ continue;
+
+ if (bc) {
+ entry.saddr =
+#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
+ (entry.family == AF_INET6) ?
+ tcp6_rsk(req)->loc_addr.s6_addr32 :
+#endif
+ &ireq->loc_addr;
+ entry.daddr =
+#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
+ (entry.family == AF_INET6) ?
+ tcp6_rsk(req)->rmt_addr.s6_addr32 :
+#endif
+ &ireq->rmt_addr;
+ entry.dport = ntohs(ireq->rmt_port);
+
+ if (!inet_diag_bc_run(RTA_DATA(bc),
+ RTA_PAYLOAD(bc), &entry))
+ continue;
+ }
+
+ err = inet_diag_fill_req(skb, sk, req,
+ NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq, cb->nlh);
+ if (err < 0) {
+ cb->args[3] = j + 1;
+ cb->args[4] = reqnum;
+ goto out;
+ }
+ }
+
+ s_reqnum = 0;
+ }
+
+out:
+ read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
+
+ return err;
+}
+
+static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ int i, num;
+ int s_i, s_num;
+ struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
+ const struct inet_diag_handler *handler;
+ struct inet_hashinfo *hashinfo;
+
+ handler = inet_diag_table[cb->nlh->nlmsg_type];
+ BUG_ON(handler == NULL);
+ hashinfo = handler->idiag_hashinfo;
+
+ s_i = cb->args[1];
+ s_num = num = cb->args[2];
+
+ if (cb->args[0] == 0) {
+ if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
+ goto skip_listen_ht;
+
+ inet_listen_lock(hashinfo);
+ for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
+ struct sock *sk;
+ struct hlist_node *node;
+
+ num = 0;
+ sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
+ struct inet_sock *inet = inet_sk(sk);
+
+ if (num < s_num) {
+ num++;
+ continue;
+ }
+
+ if (r->id.idiag_sport != inet->sport &&
+ r->id.idiag_sport)
+ goto next_listen;
+
+ if (!(r->idiag_states & TCPF_LISTEN) ||
+ r->id.idiag_dport ||
+ cb->args[3] > 0)
+ goto syn_recv;
+
+ if (inet_diag_dump_sock(skb, sk, cb) < 0) {
+ inet_listen_unlock(hashinfo);
+ goto done;
+ }
+
+syn_recv:
+ if (!(r->idiag_states & TCPF_SYN_RECV))
+ goto next_listen;
+
+ if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
+ inet_listen_unlock(hashinfo);
+ goto done;
+ }
+
+next_listen:
+ cb->args[3] = 0;
+ cb->args[4] = 0;
+ ++num;
+ }
+
+ s_num = 0;
+ cb->args[3] = 0;
+ cb->args[4] = 0;
+ }
+ inet_listen_unlock(hashinfo);
+skip_listen_ht:
+ cb->args[0] = 1;
+ s_i = num = s_num = 0;
+ }
+
+ if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
+ return skb->len;
+
+ for (i = s_i; i < hashinfo->ehash_size; i++) {
+ struct inet_ehash_bucket *head = &hashinfo->ehash[i];
+ struct sock *sk;
+ struct hlist_node *node;
+
+ if (i > s_i)
+ s_num = 0;
+
+ read_lock_bh(&head->lock);
+
+ num = 0;
+ sk_for_each(sk, node, &head->chain) {
+ struct inet_sock *inet = inet_sk(sk);
+
+ if (num < s_num)
+ goto next_normal;
+ if (!(r->idiag_states & (1 << sk->sk_state)))
+ goto next_normal;
+ if (r->id.idiag_sport != inet->sport &&
+ r->id.idiag_sport)
+ goto next_normal;
+ if (r->id.idiag_dport != inet->dport && r->id.idiag_dport)
+ goto next_normal;
+ if (inet_diag_dump_sock(skb, sk, cb) < 0) {
+ read_unlock_bh(&head->lock);
+ goto done;
+ }
+next_normal:
+ ++num;
+ }
+
+ if (r->idiag_states & TCPF_TIME_WAIT) {
+ sk_for_each(sk, node,
+ &hashinfo->ehash[i + hashinfo->ehash_size].chain) {
+ struct inet_sock *inet = inet_sk(sk);
+
+ if (num < s_num)
+ goto next_dying;
+ if (r->id.idiag_sport != inet->sport &&
+ r->id.idiag_sport)
+ goto next_dying;
+ if (r->id.idiag_dport != inet->dport &&
+ r->id.idiag_dport)
+ goto next_dying;
+ if (inet_diag_dump_sock(skb, sk, cb) < 0) {
+ read_unlock_bh(&head->lock);
+ goto done;
+ }
+next_dying:
+ ++num;
+ }
+ }
+ read_unlock_bh(&head->lock);
+ }
+
+done:
+ cb->args[1] = i;
+ cb->args[2] = num;
+ return skb->len;
+}
+
+static int inet_diag_dump_done(struct netlink_callback *cb)
+{
+ return 0;
+}
+
+
+static __inline__ int
+inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+ if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
+ return 0;
+
+ if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX)
+ goto err_inval;
+
+ if (inet_diag_table[nlh->nlmsg_type] == NULL)
+ return -ENOENT;
+
+ if (NLMSG_LENGTH(sizeof(struct inet_diag_req)) > skb->len)
+ goto err_inval;
+
+ if (nlh->nlmsg_flags&NLM_F_DUMP) {
+ if (nlh->nlmsg_len >
+ (4 + NLMSG_SPACE(sizeof(struct inet_diag_req)))) {
+ struct rtattr *rta = (void *)(NLMSG_DATA(nlh) +
+ sizeof(struct inet_diag_req));
+ if (rta->rta_type != INET_DIAG_REQ_BYTECODE ||
+ rta->rta_len < 8 ||
+ rta->rta_len >
+ (nlh->nlmsg_len -
+ NLMSG_SPACE(sizeof(struct inet_diag_req))))
+ goto err_inval;
+ if (inet_diag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta)))
+ goto err_inval;
+ }
+ return netlink_dump_start(idiagnl, skb, nlh,
+ inet_diag_dump,
+ inet_diag_dump_done);
+ } else {
+ return inet_diag_get_exact(skb, nlh);
+ }
+
+err_inval:
+ return -EINVAL;
+}
+
+
+static inline void inet_diag_rcv_skb(struct sk_buff *skb)
+{
+ int err;
+ struct nlmsghdr * nlh;
+
+ if (skb->len >= NLMSG_SPACE(0)) {
+ nlh = (struct nlmsghdr *)skb->data;
+ if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
+ return;
+ err = inet_diag_rcv_msg(skb, nlh);
+ if (err || nlh->nlmsg_flags & NLM_F_ACK)
+ netlink_ack(skb, nlh, err);
+ }
+}
+
+static void inet_diag_rcv(struct sock *sk, int len)
+{
+ struct sk_buff *skb;
+ unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
+
+ while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) {
+ inet_diag_rcv_skb(skb);
+ kfree_skb(skb);
+ }
+}
+
+static DEFINE_SPINLOCK(inet_diag_register_lock);
+
+int inet_diag_register(const struct inet_diag_handler *h)
+{
+ const __u16 type = h->idiag_type;
+ int err = -EINVAL;
+
+ if (type >= INET_DIAG_GETSOCK_MAX)
+ goto out;
+
+ spin_lock(&inet_diag_register_lock);
+ err = -EEXIST;
+ if (inet_diag_table[type] == NULL) {
+ inet_diag_table[type] = h;
+ err = 0;
+ }
+ spin_unlock(&inet_diag_register_lock);
+out:
+ return err;
+}
+EXPORT_SYMBOL_GPL(inet_diag_register);
+
+void inet_diag_unregister(const struct inet_diag_handler *h)
+{
+ const __u16 type = h->idiag_type;
+
+ if (type >= INET_DIAG_GETSOCK_MAX)
+ return;
+
+ spin_lock(&inet_diag_register_lock);
+ inet_diag_table[type] = NULL;
+ spin_unlock(&inet_diag_register_lock);
+
+ synchronize_rcu();
+}
+EXPORT_SYMBOL_GPL(inet_diag_unregister);
+
+static int __init inet_diag_init(void)
+{
+ const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
+ sizeof(struct inet_diag_handler *));
+ int err = -ENOMEM;
+
+ inet_diag_table = kmalloc(inet_diag_table_size, GFP_KERNEL);
+ if (!inet_diag_table)
+ goto out;
+
+ memset(inet_diag_table, 0, inet_diag_table_size);
+ idiagnl = netlink_kernel_create(NETLINK_INET_DIAG, 0, inet_diag_rcv,
+ THIS_MODULE);
+ if (idiagnl == NULL)
+ goto out_free_table;
+ err = 0;
+out:
+ return err;
+out_free_table:
+ kfree(inet_diag_table);
+ goto out;
+}
+
+static void __exit inet_diag_exit(void)
+{
+ sock_release(idiagnl->sk_socket);
+ kfree(inet_diag_table);
+}
+
+module_init(inet_diag_init);
+module_exit(inet_diag_exit);
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-04 14:41:31 +0000