cregit-Linux how code gets into the kernel

Release 4.15 net/netfilter/nft_byteorder.c

Directory: net/netfilter
/*
 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Development of this code funded by Astaro AG (http://www.astaro.com/)
 */

#include <asm/unaligned.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables_core.h>
#include <net/netfilter/nf_tables.h>


struct nft_byteorder {
	
enum nft_registers	sreg:8;
	
enum nft_registers	dreg:8;
	
enum nft_byteorder_ops	op:8;
	
u8			len;
	
u8			size;
};


static void nft_byteorder_eval(const struct nft_expr *expr, struct nft_regs *regs, const struct nft_pktinfo *pkt) { const struct nft_byteorder *priv = nft_expr_priv(expr); u32 *src = &regs->data[priv->sreg]; u32 *dst = &regs->data[priv->dreg]; union { u32 u32; u16 u16; } *s, *d; unsigned int i; s = (void *)src; d = (void *)dst; switch (priv->size) { case 8: { u64 src64; switch (priv->op) { case NFT_BYTEORDER_NTOH: for (i = 0; i < priv->len / 8; i++) { src64 = get_unaligned((u64 *)&src[i]); put_unaligned_be64(src64, &dst[i]); } break; case NFT_BYTEORDER_HTON: for (i = 0; i < priv->len / 8; i++) { src64 = get_unaligned_be64(&src[i]); put_unaligned(src64, (u64 *)&dst[i]); } break; } break; } case 4: switch (priv->op) { case NFT_BYTEORDER_NTOH: for (i = 0; i < priv->len / 4; i++) d[i].u32 = ntohl((__force __be32)s[i].u32); break; case NFT_BYTEORDER_HTON: for (i = 0; i < priv->len / 4; i++) d[i].u32 = (__force __u32)htonl(s[i].u32); break; } break; case 2: switch (priv->op) { case NFT_BYTEORDER_NTOH: for (i = 0; i < priv->len / 2; i++) d[i].u16 = ntohs((__force __be16)s[i].u16); break; case NFT_BYTEORDER_HTON: for (i = 0; i < priv->len / 2; i++) d[i].u16 = (__force __u16)htons(s[i].u16); break; } break; } }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy29772.09%360.00%
Florian Westphal11527.91%240.00%
Total412100.00%5100.00%

static const struct nla_policy nft_byteorder_policy[NFTA_BYTEORDER_MAX + 1] = { [NFTA_BYTEORDER_SREG] = { .type = NLA_U32 }, [NFTA_BYTEORDER_DREG] = { .type = NLA_U32 }, [NFTA_BYTEORDER_OP] = { .type = NLA_U32 }, [NFTA_BYTEORDER_LEN] = { .type = NLA_U32 }, [NFTA_BYTEORDER_SIZE] = { .type = NLA_U32 }, };
static int nft_byteorder_init(const struct nft_ctx *ctx, const struct nft_expr *expr, const struct nlattr * const tb[]) { struct nft_byteorder *priv = nft_expr_priv(expr); u32 size, len; int err; if (tb[NFTA_BYTEORDER_SREG] == NULL || tb[NFTA_BYTEORDER_DREG] == NULL || tb[NFTA_BYTEORDER_LEN] == NULL || tb[NFTA_BYTEORDER_SIZE] == NULL || tb[NFTA_BYTEORDER_OP] == NULL) return -EINVAL; priv->op = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_OP])); switch (priv->op) { case NFT_BYTEORDER_NTOH: case NFT_BYTEORDER_HTON: break; default: return -EINVAL; } err = nft_parse_u32_check(tb[NFTA_BYTEORDER_SIZE], U8_MAX, &size); if (err < 0) return err; priv->size = size; switch (priv->size) { case 2: case 4: case 8: break; default: return -EINVAL; } priv->sreg = nft_parse_register(tb[NFTA_BYTEORDER_SREG]); err = nft_parse_u32_check(tb[NFTA_BYTEORDER_LEN], U8_MAX, &len); if (err < 0) return err; priv->len = len; err = nft_validate_register_load(priv->sreg, priv->len); if (err < 0) return err; priv->dreg = nft_parse_register(tb[NFTA_BYTEORDER_DREG]); return nft_validate_register_store(ctx, priv->dreg, NULL, NFT_DATA_VALUE, priv->len); }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy21580.52%571.43%
Laura Garcia Liebana4918.35%114.29%
Florian Westphal31.12%114.29%
Total267100.00%7100.00%


static int nft_byteorder_dump(struct sk_buff *skb, const struct nft_expr *expr) { const struct nft_byteorder *priv = nft_expr_priv(expr); if (nft_dump_register(skb, NFTA_BYTEORDER_SREG, priv->sreg)) goto nla_put_failure; if (nft_dump_register(skb, NFTA_BYTEORDER_DREG, priv->dreg)) goto nla_put_failure; if (nla_put_be32(skb, NFTA_BYTEORDER_OP, htonl(priv->op))) goto nla_put_failure; if (nla_put_be32(skb, NFTA_BYTEORDER_LEN, htonl(priv->len))) goto nla_put_failure; if (nla_put_be32(skb, NFTA_BYTEORDER_SIZE, htonl(priv->size))) goto nla_put_failure; return 0; nla_put_failure: return -1; }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy126100.00%2100.00%
Total126100.00%2100.00%

static const struct nft_expr_ops nft_byteorder_ops = { .type = &nft_byteorder_type, .size = NFT_EXPR_SIZE(sizeof(struct nft_byteorder)), .eval = nft_byteorder_eval, .init = nft_byteorder_init, .dump = nft_byteorder_dump, }; struct nft_expr_type nft_byteorder_type __read_mostly = { .name = "byteorder", .ops = &nft_byteorder_ops, .policy = nft_byteorder_policy, .maxattr = NFTA_BYTEORDER_MAX, .owner = THIS_MODULE, };

Overall Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy83483.07%872.73%
Florian Westphal12112.05%218.18%
Laura Garcia Liebana494.88%19.09%
Total1004100.00%11100.00%
Directory: net/netfilter
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