[TCPDIAG]: Implement cheapest way of supporting DCCPDIAG_GETSOCK
With ugly ifdefs, etc, but this actually:
1. keeps the existing ABI, i.e. no need to recompile the iproute2
utilities if not interested in DCCP.
2. Provides all the tcp_diag functionality in DCCP, with just a
small patch that makes iproute2 support DCCP.
Of course I'll get this cleaned-up in time, but for now I think its
OK to be this way to quickly get this functionality.
iproute2-ss050808 patch at:
http://vger.kernel.org/~acme/iproute2-ss050808.dccp.patch
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
index 4288ecf..f5fc84a 100644
--- a/net/ipv4/tcp_diag.c
+++ b/net/ipv4/tcp_diag.c
@@ -45,11 +45,15 @@
#define TCPDIAG_PUT(skb, attrtype, attrlen) \
RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
+#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
+extern struct inet_hashinfo dccp_hashinfo;
+#endif
+
static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk,
- int ext, u32 pid, u32 seq, u16 nlmsg_flags)
+ int ext, u32 pid, u32 seq, u16 nlmsg_flags,
+ const struct nlmsghdr *unlh)
{
const struct inet_sock *inet = inet_sk(sk);
- struct tcp_sock *tp = tcp_sk(sk);
const struct inet_connection_sock *icsk = inet_csk(sk);
struct tcpdiagmsg *r;
struct nlmsghdr *nlh;
@@ -57,7 +61,7 @@
struct tcpdiag_meminfo *minfo = NULL;
unsigned char *b = skb->tail;
- nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r));
+ 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) {
@@ -147,8 +151,20 @@
r->tcpdiag_expires = 0;
}
#undef EXPIRES_IN_MS
- r->tcpdiag_rqueue = tp->rcv_nxt - tp->copied_seq;
- r->tcpdiag_wqueue = tp->write_seq - tp->snd_una;
+ /*
+ * Ahem... for now we'll have some knowledge about TCP -acme
+ * But this is just one of two small exceptions, both in this
+ * function, so lets close our eyes for some 15 lines or so... 8)
+ * -acme
+ */
+ if (sk->sk_protocol == IPPROTO_TCP) {
+ const struct tcp_sock *tp = tcp_sk(sk);
+
+ r->tcpdiag_rqueue = tp->rcv_nxt - tp->copied_seq;
+ r->tcpdiag_wqueue = tp->write_seq - tp->snd_una;
+ } else
+ r->tcpdiag_rqueue = r->tcpdiag_wqueue = 0;
+
r->tcpdiag_uid = sock_i_uid(sk);
r->tcpdiag_inode = sock_i_ino(sk);
@@ -159,8 +175,13 @@
minfo->tcpdiag_tmem = atomic_read(&sk->sk_wmem_alloc);
}
- if (info)
- tcp_get_info(sk, info);
+ /* Ahem... for now we'll have some knowledge about TCP -acme */
+ if (info) {
+ if (sk->sk_protocol == IPPROTO_TCP)
+ tcp_get_info(sk, info);
+ else
+ memset(info, 0, sizeof(*info));
+ }
if (sk->sk_state < TCP_TIME_WAIT &&
icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
@@ -194,9 +215,13 @@
struct sock *sk;
struct tcpdiagreq *req = NLMSG_DATA(nlh);
struct sk_buff *rep;
-
+ struct inet_hashinfo *hashinfo = &tcp_hashinfo;
+#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
+ if (nlh->nlmsg_type == DCCPDIAG_GETSOCK)
+ hashinfo = &dccp_hashinfo;
+#endif
if (req->tcpdiag_family == AF_INET) {
- sk = inet_lookup(&tcp_hashinfo, req->id.tcpdiag_dst[0],
+ sk = inet_lookup(hashinfo, req->id.tcpdiag_dst[0],
req->id.tcpdiag_dport, req->id.tcpdiag_src[0],
req->id.tcpdiag_sport, req->id.tcpdiag_if);
}
@@ -230,7 +255,7 @@
if (tcpdiag_fill(rep, sk, req->tcpdiag_ext,
NETLINK_CB(in_skb).pid,
- nlh->nlmsg_seq, 0) <= 0)
+ nlh->nlmsg_seq, 0, nlh) <= 0)
BUG();
err = netlink_unicast(tcpnl, rep, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
@@ -436,12 +461,13 @@
}
return tcpdiag_fill(skb, sk, r->tcpdiag_ext, NETLINK_CB(cb->skb).pid,
- cb->nlh->nlmsg_seq, NLM_F_MULTI);
+ cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
}
static int tcpdiag_fill_req(struct sk_buff *skb, struct sock *sk,
struct request_sock *req,
- u32 pid, u32 seq)
+ u32 pid, u32 seq,
+ const struct nlmsghdr *unlh)
{
const struct inet_request_sock *ireq = inet_rsk(req);
struct inet_sock *inet = inet_sk(sk);
@@ -450,7 +476,7 @@
struct nlmsghdr *nlh;
long tmo;
- nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r));
+ nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
nlh->nlmsg_flags = NLM_F_MULTI;
r = NLMSG_DATA(nlh);
@@ -526,7 +552,7 @@
entry.userlocks = sk->sk_userlocks;
}
- for (j = s_j; j < TCP_SYNQ_HSIZE; j++) {
+ for (j = s_j; j < lopt->nr_table_entries; j++) {
struct request_sock *req, *head = lopt->syn_table[j];
reqnum = 0;
@@ -561,7 +587,7 @@
err = tcpdiag_fill_req(skb, sk, req,
NETLINK_CB(cb->skb).pid,
- cb->nlh->nlmsg_seq);
+ cb->nlh->nlmsg_seq, cb->nlh);
if (err < 0) {
cb->args[3] = j + 1;
cb->args[4] = reqnum;
@@ -583,20 +609,26 @@
int i, num;
int s_i, s_num;
struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
+ struct inet_hashinfo *hashinfo;
s_i = cb->args[1];
s_num = num = cb->args[2];
-
+ hashinfo = &tcp_hashinfo;
+#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
+ if (cb->nlh->nlmsg_type == DCCPDIAG_GETSOCK)
+ hashinfo = &dccp_hashinfo;
+#endif
if (cb->args[0] == 0) {
if (!(r->tcpdiag_states&(TCPF_LISTEN|TCPF_SYN_RECV)))
goto skip_listen_ht;
- inet_listen_lock(&tcp_hashinfo);
+
+ 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, &tcp_hashinfo.listening_hash[i]) {
+ sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
struct inet_sock *inet = inet_sk(sk);
if (num < s_num) {
@@ -614,7 +646,7 @@
goto syn_recv;
if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
- inet_listen_unlock(&tcp_hashinfo);
+ inet_listen_unlock(hashinfo);
goto done;
}
@@ -623,7 +655,7 @@
goto next_listen;
if (tcpdiag_dump_reqs(skb, sk, cb) < 0) {
- inet_listen_unlock(&tcp_hashinfo);
+ inet_listen_unlock(hashinfo);
goto done;
}
@@ -637,7 +669,7 @@
cb->args[3] = 0;
cb->args[4] = 0;
}
- inet_listen_unlock(&tcp_hashinfo);
+ inet_listen_unlock(hashinfo);
skip_listen_ht:
cb->args[0] = 1;
s_i = num = s_num = 0;
@@ -646,8 +678,8 @@
if (!(r->tcpdiag_states&~(TCPF_LISTEN|TCPF_SYN_RECV)))
return skb->len;
- for (i = s_i; i < tcp_hashinfo.ehash_size; i++) {
- struct inet_ehash_bucket *head = &tcp_hashinfo.ehash[i];
+ for (i = s_i; i < hashinfo->ehash_size; i++) {
+ struct inet_ehash_bucket *head = &hashinfo->ehash[i];
struct sock *sk;
struct hlist_node *node;
@@ -679,7 +711,7 @@
if (r->tcpdiag_states&TCPF_TIME_WAIT) {
sk_for_each(sk, node,
- &tcp_hashinfo.ehash[i + tcp_hashinfo.ehash_size].chain) {
+ &hashinfo->ehash[i + hashinfo->ehash_size].chain) {
struct inet_sock *inet = inet_sk(sk);
if (num < s_num)
@@ -719,7 +751,11 @@
if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
return 0;
- if (nlh->nlmsg_type != TCPDIAG_GETSOCK)
+ if (nlh->nlmsg_type != TCPDIAG_GETSOCK
+#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
+ && nlh->nlmsg_type != DCCPDIAG_GETSOCK
+#endif
+ )
goto err_inval;
if (NLMSG_LENGTH(sizeof(struct tcpdiagreq)) > skb->len)