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Hello Jenkins Builder,

I'd like you to reexamine a change. Please visit

https://gerrit.osmocom.org/c/libosmocore/+/34113

to look at the new patch set (#2).

Change subject: socket: Add osmo_sock_init flag to enable SCTP ASCONF features ......................................................................

socket: Add osmo_sock_init flag to enable SCTP ASCONF features

The SCTP_ASCONF_SUPPORTED sockopt, which enables ASCONF features for the SCTP associations managed by the SCTP socket, gets its default value from to sysctl "net.sctp.addip_enable", which, at least up to current kernel 6.4.8 is set to "0" (disabled) by default. As a result, ASCONF related features such as setsockopt(SCTP_SET_PEER_PRIMARY_ADDR) fail with -EPERM since ASNCONF extensions where not negotiated during the SCTP init handshake. This commit adds support for setting SCTP_ASCONF_SUPPORTED=1 during socket creation, since that needs to be applied before the first bind()/connect() (before first assoc is created).

Furthermore, for ASCONF features to work properly, the assoc also needs to announce/use the AUTH extension, as per RFC5061 section 4.2.7. Otherwise, the peer receiving an SCTP INIT with ExtensionFeatures=ASCONF,ASCONF_ACK but without AUTH, will reject the assoc with an ABORT since it's not complying with spec (this behavior can be tweaked through sysctl "net.sctp.addip_noauth_enable").

The AUTH extension is enabled through sockopt SCTP_AUTH_SUPPORTED, and its default value is that of sysctl "net.sctp.auth_enable", which is also disabled (0) by default.

Kernel support for those is relatively new: SCTP_FUTURE_ASSOC added in: 80df2704a375bb4b3c9c5cce9c00052361b16d61 Follows: v5.0-rc4 Precedes: v5.1-rc1

SCTP_ASCONF_SUPPORTED added in: df2c71ffdfae58961981d7cbcccea93688fc4e96 Follows: v5.3-rc5 Precedes: v5.4-rc1

SCTP_AUTH_SUPPORTED added in: 56dd525abd56f7acd7b44a52935726e3ada4916c Follows: v5.3-rc5 Precedes: v5.4-rc1

Related: OS#6076 Change-Id: Iac07031927b66a9d32d2bb2faab817e4c922a359 --- M include/osmocom/core/socket.h M src/core/socket.c 2 files changed, 101 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/13/34113/2