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C++ csum_sub函数代码示例

本文整理汇总了C++中csum_sub函数的典型用法代码示例。如果您正苦于以下问题：C++ csum_sub函数的具体用法？C++ csum_sub怎么用？C++ csum_sub使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。


在下文中一共展示了csum_sub函数的15个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: nf_ip6_checksum

__sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
                        unsigned int dataoff, u_int8_t protocol)
{
    struct ipv6hdr *ip6h = ipv6_hdr(skb);
    __sum16 csum = 0;

    switch (skb->ip_summed) {
    case CHECKSUM_COMPLETE:
        if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN)
            break;
        if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
                             skb->len - dataoff, protocol,
                             csum_sub(skb->csum,
                                      skb_checksum(skb, 0,
                                              dataoff, 0)))) {
            skb->ip_summed = CHECKSUM_UNNECESSARY;
            break;
        }
    /* fall through */
    case CHECKSUM_NONE:
        skb->csum = ~csum_unfold(
                        csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
                                        skb->len - dataoff,
                                        protocol,
                                        csum_sub(0,
                                                skb_checksum(skb, 0,
                                                        dataoff, 0))));
        csum = __skb_checksum_complete(skb);
    }
    return csum;
}
开发者ID:sandrico555，项目名称:android_kernel_jena_msm7x27a，代码行数:31，代码来源:netfilter.c

示例2: __pop_vlan_tci

/* remove VLAN header from packet and update csum accordingly. */
static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci)
{
	struct vlan_hdr *vhdr;
	int err;

	err = make_writable(skb, VLAN_ETH_HLEN);
	if (unlikely(err))
		return err;

	if (skb->ip_summed == CHECKSUM_COMPLETE)
		skb->csum = csum_sub(skb->csum, csum_partial(skb->data
					+ (2 * ETH_ALEN), VLAN_HLEN, 0));

	vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN);
	*current_tci = vhdr->h_vlan_TCI;

	memmove(skb->data + VLAN_HLEN, skb->data, 2 * ETH_ALEN);
	__skb_pull(skb, VLAN_HLEN);

	vlan_set_encap_proto(skb, vhdr);
	skb->mac_header += VLAN_HLEN;
	/* Update mac_len for subsequent MPLS actions */
	skb->mac_len -= VLAN_HLEN;

	return 0;
}
开发者ID:alexpilotti，项目名称:ovs-test1，代码行数:27，代码来源:actions.c

示例3: pop_mpls

static int pop_mpls(struct sk_buff *skb, const __be16 ethertype)
{
	struct ethhdr *hdr;
	int err;

	err = make_writable(skb, skb->mac_len + MPLS_HLEN);
	if (unlikely(err))
		return err;

	if (skb->ip_summed == CHECKSUM_COMPLETE)
		skb->csum = csum_sub(skb->csum,
				     csum_partial(mac_header_end(skb),
						  MPLS_HLEN, 0));

	memmove(skb_mac_header(skb) + MPLS_HLEN, skb_mac_header(skb),
		skb->mac_len);

	__skb_pull(skb, MPLS_HLEN);
	skb_reset_mac_header(skb);

	/* mac_header_end() is used to locate the ethertype
	 * field correctly in the presence of VLAN tags.
	 */
	hdr = (struct ethhdr *)(mac_header_end(skb) - ETH_HLEN);
	hdr->h_proto = ethertype;
	if (eth_p_mpls(skb->protocol))
		skb->protocol = ethertype;
	return 0;
}
开发者ID:alexpilotti，项目名称:ovs-test1，代码行数:29，代码来源:actions.c

示例4: lro_tcp_data_csum

static __wsum lro_tcp_data_csum(struct iphdr *iph, struct tcphdr *tcph, int len)
{
	__wsum tcp_csum;
	__wsum tcp_hdr_csum;
	__wsum tcp_ps_hdr_csum;

	tcp_csum = ~csum_unfold(tcph->check);
	tcp_hdr_csum = csum_partial((u8 *)tcph, TCP_HDR_LEN(tcph), tcp_csum);

	tcp_ps_hdr_csum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
					     len + TCP_HDR_LEN(tcph),
					     IPPROTO_TCP, 0);

	return csum_sub(csum_sub(tcp_csum, tcp_hdr_csum),
			tcp_ps_hdr_csum);
}
开发者ID:LouZiffer，项目名称:m900_kernel_cupcake-SDX，代码行数:16，代码来源:inet_lro.c

示例5: nf_ip6_checksum_partial

static __sum16 nf_ip6_checksum_partial(struct sk_buff *skb, unsigned int hook,
                                       unsigned int dataoff, unsigned int len,
                                       u_int8_t protocol)
{
    struct ipv6hdr *ip6h = ipv6_hdr(skb);
    __wsum hsum;
    __sum16 csum = 0;

    switch (skb->ip_summed) {
    case CHECKSUM_COMPLETE:
        if (len == skb->len - dataoff)
            return nf_ip6_checksum(skb, hook, dataoff, protocol);
    /* fall through */
    case CHECKSUM_NONE:
        hsum = skb_checksum(skb, 0, dataoff, 0);
        skb->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
                                 &ip6h->daddr,
                                 skb->len - dataoff,
                                 protocol,
                                 csum_sub(0, hsum)));
        skb->ip_summed = CHECKSUM_NONE;
        return __skb_checksum_complete_head(skb, dataoff + len);
    }
    return csum;
};
开发者ID:sandrico555，项目名称:android_kernel_jena_msm7x27a，代码行数:25，代码来源:netfilter.c

示例6: ip6t_npt_checkentry

static int ip6t_npt_checkentry(const struct xt_tgchk_param *par)
{
	struct ip6t_npt_tginfo *npt = par->targinfo;
	__wsum src_sum = 0, dst_sum = 0;
	struct in6_addr pfx;
	unsigned int i;

	if (npt->src_pfx_len > 64 || npt->dst_pfx_len > 64)
		return -EINVAL;

	/* Ensure that LSB of prefix is zero */
	ipv6_addr_prefix(&pfx, &npt->src_pfx.in6, npt->src_pfx_len);
	if (!ipv6_addr_equal(&pfx, &npt->src_pfx.in6))
		return -EINVAL;
	ipv6_addr_prefix(&pfx, &npt->dst_pfx.in6, npt->dst_pfx_len);
	if (!ipv6_addr_equal(&pfx, &npt->dst_pfx.in6))
		return -EINVAL;

	for (i = 0; i < ARRAY_SIZE(npt->src_pfx.in6.s6_addr16); i++) {
		src_sum = csum_add(src_sum,
				(__force __wsum)npt->src_pfx.in6.s6_addr16[i]);
		dst_sum = csum_add(dst_sum,
				(__force __wsum)npt->dst_pfx.in6.s6_addr16[i]);
	}

	npt->adjustment = ~csum_fold(csum_sub(src_sum, dst_sum));
	return 0;
}
开发者ID:AdrianHuang，项目名称:linux-3.8.13，代码行数:28，代码来源:ip6t_NPT.c

示例7: __pop_vlan_tci

/* remove VLAN header from packet and update csum accordingly. */
static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci)
{
	struct vlan_hdr *vhdr;
	int err;

	err = make_writable(skb, VLAN_ETH_HLEN);
	if (unlikely(err))
		return err;

	if (get_ip_summed(skb) == OVS_CSUM_COMPLETE)
		skb->csum = csum_sub(skb->csum, csum_partial(skb->data
					+ ETH_HLEN, VLAN_HLEN, 0));

	vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN);
	*current_tci = vhdr->h_vlan_TCI;

	memmove(skb->data + VLAN_HLEN, skb->data, 2 * ETH_ALEN);
	__skb_pull(skb, VLAN_HLEN);

	vlan_set_encap_proto(skb, vhdr);
	skb->mac_header += VLAN_HLEN;
	skb_reset_mac_len(skb);

	return 0;
}
开发者ID:ninopy，项目名称:ovs-vxlan，代码行数:26，代码来源:actions.c

示例8: udpencap_fix4

static void udpencap_fix4(struct sk_buff *skb, const struct xt_udpencap_tginfo *info)
{
	struct iphdr *iph = ip_hdr(skb);
	bool fix_csum = (skb->ip_summed == CHECKSUM_COMPLETE && !info->encap);
	__be16 newlen = htons(ntohs(iph->tot_len) + (info->encap ? 1 : -1) * sizeof(struct udphdr));
	if (fix_csum) {
		skb->csum = csum_sub(skb->csum, csum_partial(&iph->tot_len, 2, 0));
		skb->csum = csum_sub(skb->csum, csum_partial(&iph->protocol, 3, 0));
	}
	csum_replace2(&iph->check, iph->tot_len, newlen);
	iph->tot_len = newlen;
	if (iph->protocol != info->proto) {
		csum_replace2(&iph->check, htons(iph->protocol), htons(info->proto));
		iph->protocol = info->proto;
	}
	if (fix_csum) {
		skb->csum = csum_add(skb->csum, csum_partial(&iph->tot_len, 2, 0));
		skb->csum = csum_add(skb->csum, csum_partial(&iph->protocol, 3, 0));
	}
}
开发者ID:MRchildNEO，项目名称:scholarzhang，代码行数:20，代码来源:xt_UDPENCAP.c

示例9: udpencap_fix6

static void udpencap_fix6(struct sk_buff *skb, const struct xt_udpencap_tginfo *info)
{
	struct ipv6hdr *iph = ipv6_hdr(skb);
	bool fix_csum = (skb->ip_summed == CHECKSUM_COMPLETE && !info->encap);
	if (fix_csum)
		skb->csum = csum_sub(skb->csum, csum_partial(&iph->payload_len, 3, 0));
	iph->payload_len = htons(ntohs(iph->payload_len) + (info->encap ? 1 : -1) * sizeof(struct udphdr));
	iph->nexthdr = info->proto;
	if (fix_csum)
		skb->csum = csum_add(skb->csum, csum_partial(&iph->payload_len, 3, 0));
}
开发者ID:MRchildNEO，项目名称:scholarzhang，代码行数:11，代码来源:xt_UDPENCAP.c

示例10: ip_cmsg_recv_checksum

static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
				  int offset)
{
	__wsum csum = skb->csum;

	if (skb->ip_summed != CHECKSUM_COMPLETE)
		return;

	if (offset != 0)
		csum = csum_sub(csum, csum_partial(skb->data, offset, 0));

	put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
}
开发者ID:galvinli，项目名称:ath，代码行数:13，代码来源:ip_sockglue.c

示例11: ip_cmsg_recv_checksum

static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
				  int tlen, int offset)
{
	__wsum csum = skb->csum;

	if (skb->ip_summed != CHECKSUM_COMPLETE)
		return;

	if (offset != 0) {
		int tend_off = skb_transport_offset(skb) + tlen;
		csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0));
	}

	put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
}
开发者ID:AshishNamdev，项目名称:linux，代码行数:15，代码来源:ip_sockglue.c

示例12: gro_skb_checksum

/* Compute the whole skb csum in s/w and store it, then verify GRO csum
 * starting from gro_offset.
 */
static __sum16 gro_skb_checksum(struct sk_buff *skb)
{
	__sum16 sum;

	skb->csum = skb_checksum(skb, 0, skb->len, 0);
	NAPI_GRO_CB(skb)->csum = csum_sub(skb->csum,
		csum_partial(skb->data, skb_gro_offset(skb), 0));
	sum = csum_fold(NAPI_GRO_CB(skb)->csum);
	if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE)) {
		if (unlikely(!sum))
			netdev_rx_csum_fault(skb->dev);
	} else
		skb->ip_summed = CHECKSUM_COMPLETE;

	return sum;
}
开发者ID:marceleng，项目名称:linux，代码行数:19，代码来源:gre_offload.c

示例13: set_eth_addr

static int set_eth_addr(struct sk_buff *skb,
			const struct ovs_key_ethernet *eth_key)
{
	int err;
	err = make_writable(skb, ETH_HLEN);
	if (unlikely(err))
		return err;

	if (get_ip_summed(skb) == OVS_CSUM_COMPLETE)
		skb->csum = csum_sub(skb->csum, csum_partial(eth_hdr(skb),
							     ETH_ALEN * 2, 0));

	memcpy(eth_hdr(skb)->h_source, eth_key->eth_src, ETH_ALEN);
	memcpy(eth_hdr(skb)->h_dest, eth_key->eth_dst, ETH_ALEN);

	if (get_ip_summed(skb) == OVS_CSUM_COMPLETE)
		skb->csum = csum_add(skb->csum, csum_partial(eth_hdr(skb),
							     ETH_ALEN * 2, 0));

	return 0;
}
开发者ID:ravikondamuru，项目名称:openvswitch，代码行数:21，代码来源:actions.c

示例14: ip6t_npt_checkentry

static int ip6t_npt_checkentry(const struct xt_tgchk_param *par)
{
	struct ip6t_npt_tginfo *npt = par->targinfo;
	struct in6_addr pfx;
	__wsum src_sum, dst_sum;

	if (npt->src_pfx_len > 64 || npt->dst_pfx_len > 64)
		return -EINVAL;

	/* Ensure that LSB of prefix is zero */
	ipv6_addr_prefix(&pfx, &npt->src_pfx.in6, npt->src_pfx_len);
	if (!ipv6_addr_equal(&pfx, &npt->src_pfx.in6))
		return -EINVAL;
	ipv6_addr_prefix(&pfx, &npt->dst_pfx.in6, npt->dst_pfx_len);
	if (!ipv6_addr_equal(&pfx, &npt->dst_pfx.in6))
		return -EINVAL;

	src_sum = csum_partial(&npt->src_pfx.in6, sizeof(npt->src_pfx.in6), 0);
	dst_sum = csum_partial(&npt->dst_pfx.in6, sizeof(npt->dst_pfx.in6), 0);

	npt->adjustment = ~csum_fold(csum_sub(src_sum, dst_sum));
	return 0;
}
开发者ID:020gzh，项目名称:linux，代码行数:23，代码来源:ip6t_NPT.c

示例15: bpf_store_bits

void bpf_store_bits(struct bpf_context *pctx, u32 off, const void *from,
		    u32 len)
{
	struct bpf_dp_context *ctx = container_of(pctx, struct bpf_dp_context,
						  context);
	struct sk_buff *skb = ctx->skb;

	if (unlikely(!skb))
		return;
	if (!pskb_may_pull(skb, off + len))
		return;

	if (skb->ip_summed == CHECKSUM_COMPLETE)
		skb->csum = csum_sub(skb->csum,
				     csum_partial(skb->data + off, len, 0));

	memcpy(skb->data + off, from, len);


	if (skb->ip_summed == CHECKSUM_COMPLETE)
		skb->csum = csum_add(skb->csum,
				     csum_partial(skb->data + off, len, 0));
}
开发者ID:iovisor-obsolete，项目名称:old_bpf_historical，代码行数:23，代码来源:bpf_plum.c


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