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net: add a new bind_add method

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The SCTP protocol allows to bind multiple address to a socket.  That
feature is currently only exposed as a socket option.  Add a bind_add
method struct proto that allows to bind additional addresses, and
switch the dlm code to use the method instead of going through the
socket option from kernel space.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig 2020-05-29 14:09:42 +02:00 • committed by David S. Miller
parent 05bfd36614
commit c0425a4249
4 changed files with 30 additions and 7 deletions
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14
net/sctp/socket.c
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@ -1052,6 +1052,18 @@ static int sctp_setsockopt_bindx(struct sock *sk,
return err;
}
static int sctp_bind_add(struct sock *sk, struct sockaddr *addrs,
int addrlen)
{
int err;
lock_sock(sk);
err = sctp_setsockopt_bindx_kernel(sk, addrs, addrlen,
SCTP_BINDX_ADD_ADDR);
release_sock(sk);
return err;
}
static int sctp_connect_new_asoc(struct sctp_endpoint *ep,
const union sctp_addr *daddr,
const struct sctp_initmsg *init,
@ -9620,6 +9632,7 @@ struct proto sctp_prot = {
.sendmsg = sctp_sendmsg,
.recvmsg = sctp_recvmsg,
.bind = sctp_bind,
.bind_add = sctp_bind_add,
.backlog_rcv = sctp_backlog_rcv,
.hash = sctp_hash,
.unhash = sctp_unhash,
@ -9662,6 +9675,7 @@ struct proto sctpv6_prot = {
.sendmsg = sctp_sendmsg,
.recvmsg = sctp_recvmsg,
.bind = sctp_bind,
.bind_add = sctp_bind_add,
.backlog_rcv = sctp_backlog_rcv,
.hash = sctp_hash,
.unhash = sctp_unhash,