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authorXin Long <lucien.xin@gmail.com>2018-03-05 20:44:19 +0800
committerDavid S. Miller <davem@davemloft.net>2018-03-07 10:55:29 -0500
commit2c0dbaa0c43d04d8d6daf52adb724c5789676b15 (patch)
tree25131ece7f234a780ca62789f1028c96fa73e06c /net/sctp
parented63afb8a318f6b3558d76afba7809daee4f28e5 (diff)
sctp: add support for SCTP_DSTADDRV4/6 Information for sendmsg
This patch is to add support for Destination IPv4/6 Address options for sendmsg, as described in section 5.3.9/10 of RFC6458. With this option, you can provide more than one destination addrs to sendmsg when creating asoc, like sctp_connectx. It's also a necessary send info for sctp_sendv. Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp')
-rw-r--r--net/sctp/socket.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index fdde697b37e7..067b57a330b1 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -1676,6 +1676,7 @@ static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
struct net *net = sock_net(sk);
struct sctp_association *asoc;
enum sctp_scope scope;
+ struct cmsghdr *cmsg;
int err = -EINVAL;
*tp = NULL;
@@ -1741,6 +1742,67 @@ static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
goto free;
}
+ if (!cmsgs->addrs_msg)
+ return 0;
+
+ /* sendv addr list parse */
+ for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
+ struct sctp_transport *transport;
+ struct sctp_association *old;
+ union sctp_addr _daddr;
+ int dlen;
+
+ if (cmsg->cmsg_level != IPPROTO_SCTP ||
+ (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
+ cmsg->cmsg_type != SCTP_DSTADDRV6))
+ continue;
+
+ daddr = &_daddr;
+ memset(daddr, 0, sizeof(*daddr));
+ dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
+ if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
+ if (dlen < sizeof(struct in_addr))
+ goto free;
+
+ dlen = sizeof(struct in_addr);
+ daddr->v4.sin_family = AF_INET;
+ daddr->v4.sin_port = htons(asoc->peer.port);
+ memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
+ } else {
+ if (dlen < sizeof(struct in6_addr))
+ goto free;
+
+ dlen = sizeof(struct in6_addr);
+ daddr->v6.sin6_family = AF_INET6;
+ daddr->v6.sin6_port = htons(asoc->peer.port);
+ memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
+ }
+ err = sctp_verify_addr(sk, daddr, sizeof(*daddr));
+ if (err)
+ goto free;
+
+ old = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
+ if (old && old != asoc) {
+ if (old->state >= SCTP_STATE_ESTABLISHED)
+ err = -EISCONN;
+ else
+ err = -EALREADY;
+ goto free;
+ }
+
+ if (sctp_endpoint_is_peeled_off(ep, daddr)) {
+ err = -EADDRNOTAVAIL;
+ goto free;
+ }
+
+ transport = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL,
+ SCTP_UNKNOWN);
+ if (!transport) {
+ err = -ENOMEM;
+ goto free;
+ }
+ }
+
return 0;
free:
@@ -7778,6 +7840,21 @@ static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
cmsgs->prinfo->pr_value = 0;
break;
+ case SCTP_DSTADDRV4:
+ case SCTP_DSTADDRV6:
+ /* SCTP Socket API Extension
+ * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
+ *
+ * This cmsghdr structure specifies SCTP options for sendmsg().
+ *
+ * cmsg_level cmsg_type cmsg_data[]
+ * ------------ ------------ ---------------------
+ * IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
+ * ------------ ------------ ---------------------
+ * IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
+ */
+ cmsgs->addrs_msg = my_msg;
+ break;
default:
return -EINVAL;
}