cregit-Linux how code gets into the kernel

Release 4.14 net/sched/em_cmp.c

Directory: net/sched
/*
 * net/sched/em_cmp.c   Simple packet data comparison ematch
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 * Authors:     Thomas Graf <tgraf@suug.ch>
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/tc_ematch/tc_em_cmp.h>
#include <asm/unaligned.h>
#include <net/pkt_cls.h>


static inline int cmp_needs_transformation(struct tcf_em_cmp *cmp) { return unlikely(cmp->flags & TCF_EM_CMP_TRANS); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller22100.00%1100.00%
Total22100.00%1100.00%


static int em_cmp_match(struct sk_buff *skb, struct tcf_ematch *em, struct tcf_pkt_info *info) { struct tcf_em_cmp *cmp = (struct tcf_em_cmp *) em->data; unsigned char *ptr = tcf_get_base_ptr(skb, cmp->layer) + cmp->off; u32 val = 0; if (!tcf_valid_offset(skb, ptr, cmp->align)) return 0; switch (cmp->align) { case TCF_EM_ALIGN_U8: val = *ptr; break; case TCF_EM_ALIGN_U16: val = get_unaligned_be16(ptr); if (cmp_needs_transformation(cmp)) val = be16_to_cpu(val); break; case TCF_EM_ALIGN_U32: /* Worth checking boundries? The branching seems * to get worse. Visit again. */ val = get_unaligned_be32(ptr); if (cmp_needs_transformation(cmp)) val = be32_to_cpu(val); break; default: return 0; } if (cmp->mask) val &= cmp->mask; switch (cmp->opnd) { case TCF_EM_OPND_EQ: return val == cmp->val; case TCF_EM_OPND_LT: return val < cmp->val; case TCF_EM_OPND_GT: return val > cmp->val; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller19396.50%133.33%
Harvey Harrison63.00%133.33%
Eric Dumazet10.50%133.33%
Total200100.00%3100.00%

static struct tcf_ematch_ops em_cmp_ops = { .kind = TCF_EM_CMP, .datalen = sizeof(struct tcf_em_cmp), .match = em_cmp_match, .owner = THIS_MODULE, .link = LIST_HEAD_INIT(em_cmp_ops.link) };
static int __init init_em_cmp(void) { return tcf_em_register(&em_cmp_ops); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller16100.00%1100.00%
Total16100.00%1100.00%


static void __exit exit_em_cmp(void) { tcf_em_unregister(&em_cmp_ops); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller15100.00%1100.00%
Total15100.00%1100.00%

MODULE_LICENSE("GPL"); module_init(init_em_cmp); module_exit(exit_em_cmp); MODULE_ALIAS_TCF_EMATCH(TCF_EM_CMP);

Overall Contributors

PersonTokensPropCommitsCommitProp
David S. Miller31995.51%125.00%
Harvey Harrison92.69%125.00%
Patrick McHardy51.50%125.00%
Eric Dumazet10.30%125.00%
Total334100.00%4100.00%
Directory: net/sched
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