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;
}
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;
}
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;
}
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);
}
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;
};
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;
}
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;
}
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));
}
}
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));
}
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);
}
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);
}
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;
}
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;
}
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;
}
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));
}