/* * 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 */ #include #include #include #include #include #include #include static inline int cmp_needs_transformation(struct tcf_em_cmp *cmp) { return unlikely(cmp->flags & TCF_EM_CMP_TRANS); } 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; } 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); } static void __exit exit_em_cmp(void) { tcf_em_unregister(&em_cmp_ops); } MODULE_LICENSE("GPL"); module_init(init_em_cmp); module_exit(exit_em_cmp); MODULE_ALIAS_TCF_EMATCH(TCF_EM_CMP); lass='form'>
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authorLinus Torvalds <torvalds@linux-foundation.org>2016-12-30 09:32:26 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-30 09:32:26 -0800
commit238d1d0f79f619d75c2cc741d6770fb0986aef24 (patch)
treeed11bb89c3c61cba7aff3ebc90647f83758a982d /tools/include/uapi
parentf3de082c12e5e9ff43c58a7561f6ec3272d03a48 (diff)
parent36f671be1db1b17d3d4ab0c8b47f81ccb1efcb75 (diff)
Merge tag 'docs-4.10-rc1-fix' of git://git.lwn.net/linux
Pull documentation fixes from Jonathan Corbet: "Two small fixes: - A merge error on my part broke the DocBook build. I've requisitioned one of tglx's frozen sharks for appropriate disciplinary action and resolved to be more careful about testing the DocBook stuff as long as it's still around. - Fix an error in unaligned-memory-access.txt" * tag 'docs-4.10-rc1-fix' of git://git.lwn.net/linux: Documentation/unaligned-memory-access.txt: fix incorrect comparison operator docs: Fix build failure
Diffstat (limited to 'tools/include/uapi')