Commit 8f840e47 authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

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: default avatarXin Long <lucien.xin@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cb2050a7
......@@ -113,6 +113,8 @@ enum {
INET_DIAG_DCTCPINFO,
INET_DIAG_PROTOCOL, /* response attribute only */
INET_DIAG_SKV6ONLY,
INET_DIAG_LOCALS,
INET_DIAG_PEERS,
};
#define INET_DIAG_MAX INET_DIAG_SKV6ONLY
......
......@@ -99,5 +99,9 @@ config SCTP_COOKIE_HMAC_SHA1
select CRYPTO_HMAC if SCTP_COOKIE_HMAC_SHA1
select CRYPTO_SHA1 if SCTP_COOKIE_HMAC_SHA1
config INET_SCTP_DIAG
depends on INET_DIAG
def_tristate INET_DIAG
endif # IP_SCTP
......@@ -4,6 +4,7 @@
obj-$(CONFIG_IP_SCTP) += sctp.o
obj-$(CONFIG_NET_SCTPPROBE) += sctp_probe.o
obj-$(CONFIG_INET_SCTP_DIAG) += sctp_diag.o
sctp-y := sm_statetable.o sm_statefuns.o sm_sideeffect.o \
protocol.o endpointola.o associola.o \
......
#include <linux/module.h>
#include <linux/inet_diag.h>
#include <linux/sock_diag.h>
#include <net/sctp/sctp.h>
extern void inet_diag_msg_common_fill(struct inet_diag_msg *r,
struct sock *sk);
extern int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
struct inet_diag_msg *r, int ext,
struct user_namespace *user_ns);
static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
void *info);
/* define some functions to make asoc/ep fill look clean */
static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r,
struct sock *sk,
struct sctp_association *asoc)
{
union sctp_addr laddr, paddr;
struct dst_entry *dst;
laddr = list_entry(asoc->base.bind_addr.address_list.next,
struct sctp_sockaddr_entry, list)->a;
paddr = asoc->peer.primary_path->ipaddr;
dst = asoc->peer.primary_path->dst;
r->idiag_family = sk->sk_family;
r->id.idiag_sport = htons(asoc->base.bind_addr.port);
r->id.idiag_dport = htons(asoc->peer.port);
r->id.idiag_if = dst ? dst->dev->ifindex : 0;
sock_diag_save_cookie(sk, r->id.idiag_cookie);
#if IS_ENABLED(CONFIG_IPV6)
if (sk->sk_family == AF_INET6) {
*(struct in6_addr *)r->id.idiag_src = laddr.v6.sin6_addr;
*(struct in6_addr *)r->id.idiag_dst = paddr.v6.sin6_addr;
} else
#endif
{
memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr;
r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr;
}
r->idiag_state = asoc->state;
r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;
r->idiag_retrans = asoc->rtx_data_chunks;
#define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
r->idiag_expires =
EXPIRES_IN_MS(asoc->timeouts[SCTP_EVENT_TIMEOUT_T3_RTX]);
#undef EXPIRES_IN_MS
}
static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,
struct list_head *address_list)
{
struct sctp_sockaddr_entry *laddr;
int addrlen = sizeof(struct sockaddr_storage);
int addrcnt = 0;
struct nlattr *attr;
void *info = NULL;
list_for_each_entry_rcu(laddr, address_list, list)
addrcnt++;
attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt);
if (!attr)
return -EMSGSIZE;
info = nla_data(attr);
list_for_each_entry_rcu(laddr, address_list, list) {
memcpy(info, &laddr->a, addrlen);
info += addrlen;
}
return 0;
}
static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb,
struct sctp_association *asoc)
{
int addrlen = sizeof(struct sockaddr_storage);
struct sctp_transport *from;
struct nlattr *attr;
void *info = NULL;
attr = nla_reserve(skb, INET_DIAG_PEERS,
addrlen * asoc->peer.transport_count);
if (!attr)
return -EMSGSIZE;
info = nla_data(attr);
list_for_each_entry(from, &asoc->peer.transport_addr_list,
transports) {
memcpy(info, &from->ipaddr, addrlen);
info += addrlen;
}
return 0;
}
/* sctp asoc/ep fill*/
static int inet_sctp_diag_fill(struct sock *sk, struct sctp_association *asoc,
struct sk_buff *skb,
const struct inet_diag_req_v2 *req,
struct user_namespace *user_ns,
int portid, u32 seq, u16 nlmsg_flags,
const struct nlmsghdr *unlh)
{
struct sctp_endpoint *ep = sctp_sk(sk)->ep;
struct list_head *addr_list;
struct inet_diag_msg *r;
struct nlmsghdr *nlh;
int ext = req->idiag_ext;
struct sctp_infox infox;
void *info = NULL;
nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
nlmsg_flags);
if (!nlh)
return -EMSGSIZE;
r = nlmsg_data(nlh);
BUG_ON(!sk_fullsock(sk));
if (asoc) {
inet_diag_msg_sctpasoc_fill(r, sk, asoc);
} else {
inet_diag_msg_common_fill(r, sk);
r->idiag_state = sk->sk_state;
r->idiag_timer = 0;
r->idiag_retrans = 0;
}
if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns))
goto errout;
if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) {
u32 mem[SK_MEMINFO_VARS];
int amt;
if (asoc && asoc->ep->sndbuf_policy)
amt = asoc->sndbuf_used;
else
amt = sk_wmem_alloc_get(sk);
mem[SK_MEMINFO_WMEM_ALLOC] = amt;
mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0)
goto errout;
}
if (ext & (1 << (INET_DIAG_INFO - 1))) {
struct nlattr *attr;
attr = nla_reserve(skb, INET_DIAG_INFO,
sizeof(struct sctp_info));
if (!attr)
goto errout;
info = nla_data(attr);
}
infox.sctpinfo = (struct sctp_info *)info;
infox.asoc = asoc;
sctp_diag_get_info(sk, r, &infox);
addr_list = asoc ? &asoc->base.bind_addr.address_list
: &ep->base.bind_addr.address_list;
if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
goto errout;
if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
goto errout;
if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
goto errout;
nlmsg_end(skb, nlh);
return 0;
errout:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
/* callback and param */
struct sctp_comm_param {
struct sk_buff *skb;
struct netlink_callback *cb;
const struct inet_diag_req_v2 *r;
const struct nlmsghdr *nlh;
};
static size_t inet_assoc_attr_size(struct sctp_association *asoc)
{
int addrlen = sizeof(struct sockaddr_storage);
int addrcnt = 0;
struct sctp_sockaddr_entry *laddr;
list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
list)
addrcnt++;
return nla_total_size(sizeof(struct sctp_info))
+ nla_total_size(1) /* INET_DIAG_SHUTDOWN */
+ nla_total_size(1) /* INET_DIAG_TOS */
+ nla_total_size(1) /* INET_DIAG_TCLASS */
+ nla_total_size(addrlen * asoc->peer.transport_count)
+ nla_total_size(addrlen * addrcnt)
+ nla_total_size(sizeof(struct inet_diag_meminfo))
+ nla_total_size(sizeof(struct inet_diag_msg))
+ 64;
}
static int sctp_tsp_dump_one(struct sctp_transport *tsp, void *p)
{
struct sctp_association *assoc = tsp->asoc;
struct sock *sk = tsp->asoc->base.sk;
struct sctp_comm_param *commp = p;
struct sk_buff *in_skb = commp->skb;
const struct inet_diag_req_v2 *req = commp->r;
const struct nlmsghdr *nlh = commp->nlh;
struct net *net = sock_net(in_skb->sk);
struct sk_buff *rep;
int err;
err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
if (err)
goto out;
err = -ENOMEM;
rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
if (!rep)
goto out;
lock_sock(sk);
if (sk != assoc->base.sk) {
release_sock(sk);
sk = assoc->base.sk;
lock_sock(sk);
}
err = inet_sctp_diag_fill(sk, assoc, rep, req,
sk_user_ns(NETLINK_CB(in_skb).sk),
NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, 0, nlh);
release_sock(sk);
if (err < 0) {
WARN_ON(err == -EMSGSIZE);
kfree_skb(rep);
goto out;
}
err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
MSG_DONTWAIT);
if (err > 0)
err = 0;
out:
return err;
}
static int sctp_tsp_dump(struct sctp_transport *tsp, void *p)
{
struct sctp_endpoint *ep = tsp->asoc->ep;
struct sctp_comm_param *commp = p;
struct sock *sk = ep->base.sk;
struct sk_buff *skb = commp->skb;
struct netlink_callback *cb = commp->cb;
const struct inet_diag_req_v2 *r = commp->r;
struct sctp_association *assoc =
list_entry(ep->asocs.next, struct sctp_association, asocs);
int err = 0;
/* find the ep only once through the transports by this condition */
if (tsp->asoc != assoc)
goto out;
if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
goto out;
lock_sock(sk);
if (sk != assoc->base.sk)
goto release;
list_for_each_entry(assoc, &ep->asocs, asocs) {
if (cb->args[4] < cb->args[1])
goto next;
if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
r->id.idiag_sport)
goto next;
if (r->id.idiag_dport != htons(assoc->peer.port) &&
r->id.idiag_dport)
goto next;
if (!cb->args[3] &&
inet_sctp_diag_fill(sk, NULL, skb, r,
sk_user_ns(NETLINK_CB(cb->skb).sk),
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NLM_F_MULTI, cb->nlh) < 0) {
cb->args[3] = 1;
err = 2;
goto release;
}
cb->args[3] = 1;
if (inet_sctp_diag_fill(sk, assoc, skb, r,
sk_user_ns(NETLINK_CB(cb->skb).sk),
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, 0, cb->nlh) < 0) {
err = 2;
goto release;
}
next:
cb->args[4]++;
}
cb->args[1] = 0;
cb->args[2]++;
cb->args[3] = 0;
cb->args[4] = 0;
release:
release_sock(sk);
return err;
out:
cb->args[2]++;
return err;
}
static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
{
struct sctp_comm_param *commp = p;
struct sock *sk = ep->base.sk;
struct sk_buff *skb = commp->skb;
struct netlink_callback *cb = commp->cb;
const struct inet_diag_req_v2 *r = commp->r;
struct net *net = sock_net(skb->sk);
struct inet_sock *inet = inet_sk(sk);
int err = 0;
if (!net_eq(sock_net(sk), net))
goto out;
if (cb->args[4] < cb->args[1])
goto next;
if (r->sdiag_family != AF_UNSPEC &&
sk->sk_family != r->sdiag_family)
goto next;
if (r->id.idiag_sport != inet->inet_sport &&
r->id.idiag_sport)
goto next;
if (r->id.idiag_dport != inet->inet_dport &&
r->id.idiag_dport)
goto next;
if (inet_sctp_diag_fill(sk, NULL, skb, r,
sk_user_ns(NETLINK_CB(cb->skb).sk),
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
cb->nlh) < 0) {
err = 2;
goto out;
}
next:
cb->args[4]++;
out:
return err;
}
/* define the functions for sctp_diag_handler*/
static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
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);
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