52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
struct nl_msg *build_msg(int ifindex, struct nl_addr *lladdr, int mtu)
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{
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struct nl_msg *msg;
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struct nlattr *info, *vlan;
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struct ifinfomsg ifi = {
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.ifi_family = AF_INET,
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.ifi_index = ifindex,
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};
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/* Allocate a default sized netlink message */
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if (!(msg = nlmsg_alloc_simple(RTM_SETLINK, 0)))
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return NULL;
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/* Append the protocol specific header (struct ifinfomsg)*/
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if (nlmsg_append(msg, &ifi, sizeof(ifi), NLMSG_ALIGNTO) < 0)
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goto nla_put_failure
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/* Append a 32 bit integer attribute to carry the MTU */
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NLA_PUT_U32(msg, IFLA_MTU, mtu);
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/* Append a unspecific attribute to carry the link layer address */
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NLA_PUT_ADDR(msg, IFLA_ADDRESS, lladdr);
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/* Append a container for nested attributes to carry link information */
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if (!(info = nla_nest_start(msg, IFLA_LINKINFO)))
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goto nla_put_failure;
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/* Put a string attribute into the container */
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NLA_PUT_STRING(msg, IFLA_INFO_KIND, "vlan");
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/*
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* Append another container inside the open container to carry
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* vlan specific attributes
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*/
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if (!(vlan = nla_nest_start(msg, IFLA_INFO_DATA)))
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goto nla_put_failure;
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/* add vlan specific info attributes here... */
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/* Finish nesting the vlan attributes and close the second container. */
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nla_nest_end(msg, vlan);
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/* Finish nesting the link info attribute and close the first container. */
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nla_nest_end(msg, info);
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return msg;
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nla_put_failure:
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nlmsg_free(msg);
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return NULL;
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}
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