一、报错现象

sctp程序运行：
int i = socket(AF_INET,SOCK_STREAM,IPPROTO_SCTP);
printf("huilh:%d,%d\r\n",i,errno);
输出：
huilh:-1,93

checksctp:
sctp: Protocol not supported

二、解决方法

1、外围的模块加载到内核中

#yum list kernel-modules-extra*

kernel-modules-extra.x86_64             4.18.0-240.15.1.el8_3             BaseOS

#yum install kernel-modules-extra.x86_64

2、安装SCTP

yum install lksctp*

3、查看安装是否成功

# modinfo sctp

filename:       /lib/modules/4.18.0-240.15.1.el8_3.x86_64/kernel/net/sctp/sctp.ko.xz
license:        GPL
description:    Support for the SCTP protocol (RFC2960)
author:         Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>
alias:          net-pf-10-proto-132
alias:          net-pf-2-proto-132
rhelversion:    8.3
srcversion:     1F7FF36BEF4076DB3D4AF26
depends:        libcrc32c
intree:         Y
name:           sctp
vermagic:       4.18.0-240.15.1.el8_3.x86_64 SMP mod_unload modversions
sig_id:         PKCS#7
signer:         CentOS kernel signing key
sig_key:        43:C1:A4:E8:DF:2E:B3:D4:43:C1:4B:38:46:94:93:EB:C4:27:08:0D
sig_hashalgo:   sha256
signature:      1F:34:2A:3F:35:55:A9:24:B2:64:31:D6:AA:8F:E0:10:0C:76:B8:BF:
        CB:47:B0:59:39:22:B4:E8:3B:9A:F9:B5:82:D9:22:53:4E:A7:27:4C:
        D7:F3:C9:65:B6:77:1A:5A:25:18:C8:9B:D7:27:CB:A3:D4:95:ED:E5:
        3E:87:4E:E3:4F:A0:5B:DA:31:18:34:89:88:D9:CC:F5:90:76:D6:4A:
        0D:BA:1B:09:E2:10:80:7B:77:7B:15:97:7E:F9:45:92:39:7D:7C:A9:
        5D:4E:D5:8C:61:E0:F0:8D:CB:97:A7:E6:0C:84:64:6B:26:C7:69:02:
        54:EA:EB:04:C9:02:39:F8:7E:C7:08:C2:7E:83:4A:69:4F:B2:8C:83:
        C9:51:9B:5D:C7:C4:DB:5A:C4:14:DA:52:64:A2:FF:C5:E2:FE:DA:ED:
        B9:44:4B:C7:A8:D9:F4:78:A6:35:E9:E8:1C:14:E6:1B:1B:AD:72:4B:
        22:4E:05:6D:E6:DE:0A:D8:98:2C:AD:6E:25:84:1F:38:C1:D7:2B:5C:
        79:E6:CC:DF:16:D2:54:17:CD:87:B5:56:00:20:9D:09:F4:01:75:85:
        83:CA:C6:75:7E:3A:15:95:04:98:F1:D4:A1:47:CD:B1:8A:6A:3A:51:
        1F:07:1C:47:02:6A:17:CC:27:F5:DD:58:15:18:77:5B:BC:76:60:3C:
        D5:97:2C:EF:0E:32:E4:A3:93:EE:E7:F8:93:09:CB:1D:DB:84:D3:B5:
        56:C9:50:5C:42:95:7E:64:DF:CD:CE:4E:7E:AF:DE:C8:E9:29:51:62:
        46:C1:6F:BF:85:1E:EB:36:65:40:74:EF:64:47:6A:AB:11:B0:B7:24:
        4E:4F:3A:60:83:C7:5B:42:6A:A3:DC:0B:89:6C:CB:7D:EC:00:6A:8C:
        48:DE:17:B4:85:41:A1:F7:68:74:1C:FA:D2:10:89:20:A7:75:34:05:
        E7:A8:BB:AD:BA:33:2F:04:92:A1:33:1B:68:9A:D7:20:25:BA:7A:61:
        A8:DE:D2:85
parm:           no_checksums:Disable checksums computing and verification (bool)

从上述结果可以看出，可以查到模块，然后使用lsmod | grep sctp查看是否能查到模块，如果不能查到，则使用modprobe sctp 安装

4、手动加载SCTP

# modprobe sctp

安装完毕后，再用lsmod 查看是否已安装sctp模块。所示结果如下。

#lsmod | grep sctp

sctp                  405504  18
libcrc32c              16384  4 nf_conntrack,nf_nat,xfs,sctp

表明lsctp模块已在当前linux下安装完成。或者使用cat 命令。

# cat /proc/modules | grep sctp

sctp 405504 18 - Live 0xffffffffc0d71000
libcrc32c 16384 4 sctp,nf_nat,nf_conntrack,xfs, Live 0xffffffffc00dc000

5、自动加载

如果sctp不能自动加载到内核，请使用下面处理方式。

在/etc/sysconfig/modules的目录下新建sctp.modules文件

#! /bin/sh

/sbin/modinfo -F filename sctp > /dev/null 2>&1
if [ $? -eq 0 ]; then
    /sbin/modprobe sctp
fi

保存后，修改权限chmod+777 sctp.modules，重启便可看到已自动加载。