sctp: add the sctp_diag.c file
This one will implement all the interface of inet_diag, inet_diag_handler. which includes sctp_diag_dump, sctp_diag_dump_one and sctp_diag_get_info. It will work as a module, and register inet_diag_handler when loading. v2->v3: - fix the mistake in inet_assoc_attr_size(). - change inet_diag_msg_laddrs_fill() name to inet_diag_msg_sctpladdrs_fill. - change inet_diag_msg_paddrs_fill() name to inet_diag_msg_sctpaddrs_fill. - add inet_diag_msg_sctpinfo_fill() to make asoc/ep fill code clearer. - add inet_diag_msg_sctpasoc_fill() to make asoc fill code clearer. - merge inet_asoc_diag_fill() and inet_ep_diag_fill() to inet_sctp_diag_fill(). - call sctp_diag_get_info() directly, instead by handler, cause the caller is in the same file with it. - call lock_sock in sctp_tsp_dump_one() to make sure we call get sctp info safely. - after lock_sock(sk), we should check sk != assoc->base.sk. - change mem[SK_MEMINFO_WMEM_ALLOC] to asoc->sndbuf_used for asoc dump when asoc->ep->sndbuf_policy is set. don't use INET_DIAG_MEMINFO attr any more. Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long
David S. Miller
parent
cb2050a7b8
commit
8f840e47f1
4 changed files with 504 additions and 0 deletions
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@ -113,6 +113,8 @@ enum {
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INET_DIAG_DCTCPINFO,
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INET_DIAG_PROTOCOL, /* response attribute only */
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INET_DIAG_SKV6ONLY,
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INET_DIAG_LOCALS,
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INET_DIAG_PEERS,
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};
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#define INET_DIAG_MAX INET_DIAG_SKV6ONLY
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@ -99,5 +99,9 @@ config SCTP_COOKIE_HMAC_SHA1
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select CRYPTO_HMAC if SCTP_COOKIE_HMAC_SHA1
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select CRYPTO_SHA1 if SCTP_COOKIE_HMAC_SHA1
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config INET_SCTP_DIAG
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depends on INET_DIAG
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def_tristate INET_DIAG
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endif # IP_SCTP
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@ -4,6 +4,7 @@
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obj-$(CONFIG_IP_SCTP) += sctp.o
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obj-$(CONFIG_NET_SCTPPROBE) += sctp_probe.o
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obj-$(CONFIG_INET_SCTP_DIAG) += sctp_diag.o
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sctp-y := sm_statetable.o sm_statefuns.o sm_sideeffect.o \
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protocol.o endpointola.o associola.o \
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497
net/sctp/sctp_diag.c
Normal file
497
net/sctp/sctp_diag.c
Normal file
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@ -0,0 +1,497 @@
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#include <linux/module.h>
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#include <linux/inet_diag.h>
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#include <linux/sock_diag.h>
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#include <net/sctp/sctp.h>
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extern void inet_diag_msg_common_fill(struct inet_diag_msg *r,
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struct sock *sk);
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extern int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
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struct inet_diag_msg *r, int ext,
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struct user_namespace *user_ns);
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static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
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void *info);
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/* define some functions to make asoc/ep fill look clean */
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static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r,
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struct sock *sk,
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struct sctp_association *asoc)
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{
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union sctp_addr laddr, paddr;
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struct dst_entry *dst;
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laddr = list_entry(asoc->base.bind_addr.address_list.next,
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struct sctp_sockaddr_entry, list)->a;
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paddr = asoc->peer.primary_path->ipaddr;
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dst = asoc->peer.primary_path->dst;
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r->idiag_family = sk->sk_family;
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r->id.idiag_sport = htons(asoc->base.bind_addr.port);
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r->id.idiag_dport = htons(asoc->peer.port);
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r->id.idiag_if = dst ? dst->dev->ifindex : 0;
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sock_diag_save_cookie(sk, r->id.idiag_cookie);
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#if IS_ENABLED(CONFIG_IPV6)
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if (sk->sk_family == AF_INET6) {
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*(struct in6_addr *)r->id.idiag_src = laddr.v6.sin6_addr;
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*(struct in6_addr *)r->id.idiag_dst = paddr.v6.sin6_addr;
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} else
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#endif
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{
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memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
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memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
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r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr;
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r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr;
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}
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r->idiag_state = asoc->state;
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r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;
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r->idiag_retrans = asoc->rtx_data_chunks;
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#define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
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r->idiag_expires =
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EXPIRES_IN_MS(asoc->timeouts[SCTP_EVENT_TIMEOUT_T3_RTX]);
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#undef EXPIRES_IN_MS
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}
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static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,
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struct list_head *address_list)
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{
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struct sctp_sockaddr_entry *laddr;
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int addrlen = sizeof(struct sockaddr_storage);
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int addrcnt = 0;
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struct nlattr *attr;
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void *info = NULL;
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list_for_each_entry_rcu(laddr, address_list, list)
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addrcnt++;
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attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt);
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if (!attr)
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return -EMSGSIZE;
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info = nla_data(attr);
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list_for_each_entry_rcu(laddr, address_list, list) {
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memcpy(info, &laddr->a, addrlen);
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info += addrlen;
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}
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return 0;
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}
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static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb,
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struct sctp_association *asoc)
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{
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int addrlen = sizeof(struct sockaddr_storage);
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struct sctp_transport *from;
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struct nlattr *attr;
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void *info = NULL;
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attr = nla_reserve(skb, INET_DIAG_PEERS,
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addrlen * asoc->peer.transport_count);
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if (!attr)
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return -EMSGSIZE;
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info = nla_data(attr);
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list_for_each_entry(from, &asoc->peer.transport_addr_list,
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transports) {
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memcpy(info, &from->ipaddr, addrlen);
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info += addrlen;
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}
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return 0;
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}
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/* sctp asoc/ep fill*/
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static int inet_sctp_diag_fill(struct sock *sk, struct sctp_association *asoc,
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struct sk_buff *skb,
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const struct inet_diag_req_v2 *req,
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struct user_namespace *user_ns,
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int portid, u32 seq, u16 nlmsg_flags,
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const struct nlmsghdr *unlh)
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{
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struct sctp_endpoint *ep = sctp_sk(sk)->ep;
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struct list_head *addr_list;
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struct inet_diag_msg *r;
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struct nlmsghdr *nlh;
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int ext = req->idiag_ext;
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struct sctp_infox infox;
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void *info = NULL;
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nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
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nlmsg_flags);
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if (!nlh)
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return -EMSGSIZE;
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r = nlmsg_data(nlh);
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BUG_ON(!sk_fullsock(sk));
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if (asoc) {
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inet_diag_msg_sctpasoc_fill(r, sk, asoc);
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} else {
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inet_diag_msg_common_fill(r, sk);
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r->idiag_state = sk->sk_state;
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r->idiag_timer = 0;
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r->idiag_retrans = 0;
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}
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if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns))
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goto errout;
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if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) {
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u32 mem[SK_MEMINFO_VARS];
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int amt;
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if (asoc && asoc->ep->sndbuf_policy)
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amt = asoc->sndbuf_used;
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else
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amt = sk_wmem_alloc_get(sk);
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mem[SK_MEMINFO_WMEM_ALLOC] = amt;
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mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
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mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
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mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
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mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
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mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
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mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
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mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
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mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
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if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0)
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goto errout;
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}
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if (ext & (1 << (INET_DIAG_INFO - 1))) {
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struct nlattr *attr;
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attr = nla_reserve(skb, INET_DIAG_INFO,
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sizeof(struct sctp_info));
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if (!attr)
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goto errout;
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info = nla_data(attr);
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}
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infox.sctpinfo = (struct sctp_info *)info;
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infox.asoc = asoc;
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sctp_diag_get_info(sk, r, &infox);
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addr_list = asoc ? &asoc->base.bind_addr.address_list
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: &ep->base.bind_addr.address_list;
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if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
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goto errout;
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if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
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if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
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goto errout;
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if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
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goto errout;
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nlmsg_end(skb, nlh);
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return 0;
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errout:
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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}
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/* callback and param */
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struct sctp_comm_param {
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struct sk_buff *skb;
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struct netlink_callback *cb;
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const struct inet_diag_req_v2 *r;
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const struct nlmsghdr *nlh;
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};
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static size_t inet_assoc_attr_size(struct sctp_association *asoc)
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{
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int addrlen = sizeof(struct sockaddr_storage);
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int addrcnt = 0;
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struct sctp_sockaddr_entry *laddr;
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list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
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list)
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addrcnt++;
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return nla_total_size(sizeof(struct sctp_info))
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+ nla_total_size(1) /* INET_DIAG_SHUTDOWN */
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+ nla_total_size(1) /* INET_DIAG_TOS */
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+ nla_total_size(1) /* INET_DIAG_TCLASS */
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+ nla_total_size(addrlen * asoc->peer.transport_count)
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+ nla_total_size(addrlen * addrcnt)
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+ nla_total_size(sizeof(struct inet_diag_meminfo))
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+ nla_total_size(sizeof(struct inet_diag_msg))
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+ 64;
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}
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static int sctp_tsp_dump_one(struct sctp_transport *tsp, void *p)
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{
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struct sctp_association *assoc = tsp->asoc;
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struct sock *sk = tsp->asoc->base.sk;
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struct sctp_comm_param *commp = p;
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struct sk_buff *in_skb = commp->skb;
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const struct inet_diag_req_v2 *req = commp->r;
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const struct nlmsghdr *nlh = commp->nlh;
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struct net *net = sock_net(in_skb->sk);
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struct sk_buff *rep;
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int err;
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err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
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if (err)
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goto out;
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err = -ENOMEM;
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rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
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if (!rep)
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goto out;
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lock_sock(sk);
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if (sk != assoc->base.sk) {
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release_sock(sk);
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sk = assoc->base.sk;
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lock_sock(sk);
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}
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err = inet_sctp_diag_fill(sk, assoc, rep, req,
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sk_user_ns(NETLINK_CB(in_skb).sk),
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NETLINK_CB(in_skb).portid,
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nlh->nlmsg_seq, 0, nlh);
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release_sock(sk);
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if (err < 0) {
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WARN_ON(err == -EMSGSIZE);
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kfree_skb(rep);
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goto out;
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}
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err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
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MSG_DONTWAIT);
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if (err > 0)
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err = 0;
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out:
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return err;
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}
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static int sctp_tsp_dump(struct sctp_transport *tsp, void *p)
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{
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struct sctp_endpoint *ep = tsp->asoc->ep;
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struct sctp_comm_param *commp = p;
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struct sock *sk = ep->base.sk;
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struct sk_buff *skb = commp->skb;
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struct netlink_callback *cb = commp->cb;
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const struct inet_diag_req_v2 *r = commp->r;
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struct sctp_association *assoc =
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list_entry(ep->asocs.next, struct sctp_association, asocs);
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int err = 0;
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/* find the ep only once through the transports by this condition */
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if (tsp->asoc != assoc)
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goto out;
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if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
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goto out;
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lock_sock(sk);
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if (sk != assoc->base.sk)
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goto release;
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list_for_each_entry(assoc, &ep->asocs, asocs) {
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if (cb->args[4] < cb->args[1])
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goto next;
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if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
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r->id.idiag_sport)
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goto next;
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if (r->id.idiag_dport != htons(assoc->peer.port) &&
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r->id.idiag_dport)
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goto next;
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if (!cb->args[3] &&
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inet_sctp_diag_fill(sk, NULL, skb, r,
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sk_user_ns(NETLINK_CB(cb->skb).sk),
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NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq,
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NLM_F_MULTI, cb->nlh) < 0) {
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cb->args[3] = 1;
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err = 2;
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goto release;
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}
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cb->args[3] = 1;
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if (inet_sctp_diag_fill(sk, assoc, skb, r,
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sk_user_ns(NETLINK_CB(cb->skb).sk),
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NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq, 0, cb->nlh) < 0) {
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err = 2;
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goto release;
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}
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next:
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cb->args[4]++;
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}
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cb->args[1] = 0;
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cb->args[2]++;
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cb->args[3] = 0;
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cb->args[4] = 0;
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release:
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release_sock(sk);
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return err;
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out:
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cb->args[2]++;
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return err;
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}
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static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
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{
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struct sctp_comm_param *commp = p;
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struct sock *sk = ep->base.sk;
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struct sk_buff *skb = commp->skb;
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struct netlink_callback *cb = commp->cb;
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const struct inet_diag_req_v2 *r = commp->r;
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struct net *net = sock_net(skb->sk);
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struct inet_sock *inet = inet_sk(sk);
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int err = 0;
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if (!net_eq(sock_net(sk), net))
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goto out;
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if (cb->args[4] < cb->args[1])
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goto next;
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if (r->sdiag_family != AF_UNSPEC &&
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sk->sk_family != r->sdiag_family)
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goto next;
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if (r->id.idiag_sport != inet->inet_sport &&
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r->id.idiag_sport)
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goto next;
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if (r->id.idiag_dport != inet->inet_dport &&
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r->id.idiag_dport)
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goto next;
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if (inet_sctp_diag_fill(sk, NULL, skb, r,
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sk_user_ns(NETLINK_CB(cb->skb).sk),
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NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq, NLM_F_MULTI,
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cb->nlh) < 0) {
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err = 2;
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goto out;
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}
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next:
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cb->args[4]++;
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out:
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return err;
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}
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/* define the functions for sctp_diag_handler*/
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static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
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||||
void *info)
|
||||
{
|
||||
struct sctp_infox *infox = (struct sctp_infox *)info;
|
||||
|
||||
if (infox->asoc) {
|
||||
r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
|
||||
r->idiag_wqueue = infox->asoc->sndbuf_used;
|
||||
} else {
|
||||
r->idiag_rqueue = sk->sk_ack_backlog;
|
||||
r->idiag_wqueue = sk->sk_max_ack_backlog;
|
||||
}
|
||||
if (infox->sctpinfo)
|
||||
sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
|
||||
}
|
||||
|
||||
static int sctp_diag_dump_one(struct sk_buff *in_skb,
|
||||
const struct nlmsghdr *nlh,
|
||||
const struct inet_diag_req_v2 *req)
|
||||
{
|
||||
struct net *net = sock_net(in_skb->sk);
|
||||
union sctp_addr laddr, paddr;
|
||||
struct sctp_comm_param commp = {
|
||||
.skb = in_skb,
|
||||
.r = req,
|
||||
.nlh = nlh,
|
||||
};
|
||||
|
||||
if (req->sdiag_family == AF_INET) {
|
||||
laddr.v4.sin_port = req->id.idiag_sport;
|
||||
laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
|
||||
laddr.v4.sin_family = AF_INET;
|
||||
|
||||
paddr.v4.sin_port = req->id.idiag_dport;
|
||||
paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
|
||||
paddr.v4.sin_family = AF_INET;
|
||||
} else {
|
||||
laddr.v6.sin6_port = req->id.idiag_sport;
|
||||
memcpy(&laddr.v6.sin6_addr, req->id.idiag_src, 64);
|
||||
laddr.v6.sin6_family = AF_INET6;
|
||||
|
||||
paddr.v6.sin6_port = req->id.idiag_dport;
|
||||
memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst, 64);
|
||||
paddr.v6.sin6_family = AF_INET6;
|
||||
}
|
||||
|
||||
return sctp_transport_lookup_process(sctp_tsp_dump_one,
|
||||
net, &laddr, &paddr, &commp);
|
||||
}
|
||||
|
||||
static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
|
||||
const struct inet_diag_req_v2 *r, struct nlattr *bc)
|
||||
{
|
||||
u32 idiag_states = r->idiag_states;
|
||||
struct net *net = sock_net(skb->sk);
|
||||
struct sctp_comm_param commp = {
|
||||
.skb = skb,
|
||||
.cb = cb,
|
||||
.r = r,
|
||||
};
|
||||
|
||||
/* eps hashtable dumps
|
||||
* args:
|
||||
* 0 : if it will traversal listen sock
|
||||
* 1 : to record the sock pos of this time's traversal
|
||||
* 4 : to work as a temporary variable to traversal list
|
||||
*/
|
||||
if (cb->args[0] == 0) {
|
||||
if (!(idiag_states & TCPF_LISTEN))
|
||||
goto skip;
|
||||
if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
|
||||
goto done;
|
||||
skip:
|
||||
cb->args[0] = 1;
|
||||
cb->args[1] = 0;
|
||||
cb->args[4] = 0;
|
||||
}
|
||||
|
||||
/* asocs by transport hashtable dump
|
||||
* args:
|
||||
* 1 : to record the assoc pos of this time's traversal
|
||||
* 2 : to record the transport pos of this time's traversal
|
||||
* 3 : to mark if we have dumped the ep info of the current asoc
|
||||
* 4 : to work as a temporary variable to traversal list
|
||||
*/
|
||||
if (!(idiag_states & ~TCPF_LISTEN))
|
||||
goto done;
|
||||
sctp_for_each_transport(sctp_tsp_dump, net, cb->args[2], &commp);
|
||||
done:
|
||||
cb->args[1] = cb->args[4];
|
||||
cb->args[4] = 0;
|
||||
}
|
||||
|
||||
static const struct inet_diag_handler sctp_diag_handler = {
|
||||
.dump = sctp_diag_dump,
|
||||
.dump_one = sctp_diag_dump_one,
|
||||
.idiag_get_info = sctp_diag_get_info,
|
||||
.idiag_type = IPPROTO_SCTP,
|
||||
.idiag_info_size = sizeof(struct sctp_info),
|
||||
};
|
||||
|
||||
static int __init sctp_diag_init(void)
|
||||
{
|
||||
return inet_diag_register(&sctp_diag_handler);
|
||||
}
|
||||
|
||||
static void __exit sctp_diag_exit(void)
|
||||
{
|
||||
inet_diag_unregister(&sctp_diag_handler);
|
||||
}
|
||||
|
||||
module_init(sctp_diag_init);
|
||||
module_exit(sctp_diag_exit);
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);
|
||||
Loading…
Reference in a new issue