From 540722ffc3a0d7e11d97a13e1ce6f3bc23b061c1 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Wed, 10 Aug 2005 05:54:28 -0300 Subject: [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 Signed-off-by: David S. Miller --- net/ipv4/tcp_diag.c | 86 +++++++++++++++++++++++++++++++++++++---------------- 1 file changed, 61 insertions(+), 25 deletions(-) (limited to 'net/ipv4/tcp_diag.c') diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c index 4288ecfec9a7..f5fc84aaa9b4 100644 --- a/net/ipv4/tcp_diag.c +++ b/net/ipv4/tcp_diag.c @@ -45,11 +45,15 @@ static struct sock *tcpnl; #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 @@ static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk, 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 @@ static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk, 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 @@ static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk, 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 @@ static int tcpdiag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh) 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 @@ static int tcpdiag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh) 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 @@ static int tcpdiag_dump_sock(struct sk_buff *skb, struct sock *sk, } 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 @@ static int tcpdiag_fill_req(struct sk_buff *skb, struct sock *sk, 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 @@ static int tcpdiag_dump_reqs(struct sk_buff *skb, struct sock *sk, 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 @@ static int tcpdiag_dump_reqs(struct sk_buff *skb, struct sock *sk, 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 @@ static int tcpdiag_dump(struct sk_buff *skb, struct netlink_callback *cb) 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 @@ static int tcpdiag_dump(struct sk_buff *skb, struct netlink_callback *cb) 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 @@ syn_recv: 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 @@ next_listen: 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 @@ skip_listen_ht: 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 @@ next_normal: 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 @@ tcpdiag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 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) -- cgit v1.2.3-59-g8ed1b