98 lines
2.1 KiB
C
98 lines
2.1 KiB
C
/*
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* lkminit_deflate.c
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*
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* written by Iain Hibbert <plunky@rya-online.net>
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/exec.h>
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#include <sys/lkm.h>
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#include <sys/file.h>
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#include <sys/errno.h>
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#include <sys/mbuf.h>
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#define PACKETPTR struct mbuf *
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#include <net/ppp_defs.h>
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#include <net/ppp-comp.h>
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extern struct compressor *ppp_compressors[];
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extern struct compressor ppp_deflate;
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extern struct compressor ppp_deflate_draft;
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static int deflate_handle(struct lkm_table * lkmtp, int cmd);
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int deflate_lkmentry(struct lkm_table * lkmtp, int cmd, int ver);
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MOD_MISC("deflate")
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static int
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deflate_handle(struct lkm_table *lkmtp, int cmd)
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{
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int i = 0;
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static int qty; /* how many compressors we loaded */
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switch (cmd) {
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case LKM_E_LOAD:
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/*
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* Load the compressor into the first available slot in the
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* kernel compressors table, unless there is a CI_DEFLATE
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* compressor already listed. The table is a NULL terminated
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* list, so leave a space at the end.
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*/
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while (ppp_compressors[i]) {
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if (ppp_compressors[i]->compress_proto == CI_DEFLATE)
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return EEXIST; /* either me, or the
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* in-kernel version */
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if (++i == PPP_COMPRESSORS_MAX - 1)
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return ENFILE; /* no room */
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}
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ppp_compressors[i] = &ppp_deflate;
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qty = 1;
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/*
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* and add deflate_draft if we have any room left
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*/
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if (++i < PPP_COMPRESSORS_MAX - 1) {
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ppp_compressors[i] = &ppp_deflate_draft;
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qty = 2;
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}
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break;
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case LKM_E_UNLOAD:
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/*
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* Find the first instance of CI_DEFLATE in the table, and
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* unload it. If this instance was not mine, Somebody has been
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* Playing With Fire, and will likely Get Burnt.
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*/
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while (ppp_compressors[i]->compress_proto != CI_DEFLATE)
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i++;
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while (ppp_compressors[i] && i < (PPP_COMPRESSORS_MAX - qty)) {
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ppp_compressors[i] = ppp_compressors[i + qty];
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i++;
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}
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ppp_compressors[i] = NULL;
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break;
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case LKM_E_STAT:
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break;
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default:
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return EINVAL;
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}
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return 0; /* success */
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}
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/*
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* the module entry point.
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*/
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int
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deflate_lkmentry(struct lkm_table *lkmtp, int cmd, int ver)
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{
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DISPATCH(lkmtp, cmd, ver, deflate_handle, deflate_handle,
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deflate_handle)
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}
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