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| /freebsd-11-stable/sys/kern/ | ||
| H A D | uipc_sockbuf.c | diff 136692 Tue Oct 19 13:13:30 MDT 2004 andre Support for dynamically loadable and unloadable protocols within existing protocol families. The protosw[] array of any particular protocol family ("domain") is of fixed size defined at compile time. This made it impossible to dynamically add or remove any protocols to or from it. We work around this by introducing so called SPACER's which are embedded into the protosw[] array at compile time. The SPACER's have a special protocol number (32767) to indicate the fact that they are SPACER's but are otherwise NULL. Only as many protocols can be dynamically loaded as SPACER's are provided in the protosw[] structure. The pr_usrreqs structure is treated more special and contains pointers to dummy functions only returning EOPNOTSUPP. This is needed because the use of those functions pointers is usually not checked within the kernel because until now it was assumed to be a valid function pointer. Instead of fixing all potential callers we just return a proper error code. Two new functions provide a clean API to register and unregister a protocol. The register function expects a pointer to a valid and complete struct protosw including a pointer to struct pru_usrreqs provided by the caller. Upon successful registration the pr_init() function will be called to finish initialization of the protocol. The unregister function restores the SPACER in place of the protocol again. It is the responseability of the caller to ensure proper closing of all sockets and freeing of memory allocation by the unloading protocol. sys/protosw.h o Define generic PROTO_SPACER to be 32767 o Prototypes for all pru_*_notsupp() functions o Prototypes for pf_proto_[un]register() functions kern/uipc_domain.c o Global struct pr_usrreqs nousrreqs containing valid pointers to the pru_*_notsupp() functions o New functions pf_proto_[un]register() kern/uipc_socket2.c o New functions bodies for all pru_*_notsupp() functions |
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