static int tcf_csum_ipv4_udp(struct sk_buff *skb, unsigned int ihl,
unsigned int ipl, int udplite)
{
struct udphdr *udph;
const struct iphdr *iph;
u16 ul;
if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
return 1;
/*
* Support both UDP and UDPLITE checksum algorithms, Don't use
* udph->len to get the real length without any protocol check,
* UDPLITE uses udph->len for another thing,
* Use iph->tot_len, or just ipl.
*/
udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
if (udph == NULL)
return 0;
iph = ip_hdr(skb);
ul = ntohs(udph->len);
if (udplite || udph->check) {
udph->check = 0;
if (udplite) {
if (ul == 0)
skb->csum = csum_partial(udph, ipl - ihl, 0);
else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
skb->csum = csum_partial(udph, ul, 0);
else
goto ignore_obscure_skb;
} else {
if (ul != ipl - ihl)
goto ignore_obscure_skb;
skb->csum = csum_partial(udph, ul, 0);
}
udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
ul, iph->protocol,
skb->csum);
if (!udph->check)
udph->check = CSUM_MANGLED_0;
}
skb->ip_summed = CHECKSUM_NONE;
ignore_obscure_skb:
return 1;
}
static int tcf_csum_ipv6_udp(struct sk_buff *skb,
unsigned int ihl, unsigned int ipl, int udplite)
{
struct udphdr *udph;
const struct ipv6hdr *ip6h;
u16 ul;
/*
* Support both UDP and UDPLITE checksum algorithms, Don't use
* udph->len to get the real length without any protocol check,
* UDPLITE uses udph->len for another thing,
* Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl.
*/
udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
if (udph == NULL)
return 0;
ip6h = ipv6_hdr(skb);
ul = ntohs(udph->len);
udph->check = 0;
if (udplite) {
if (ul == 0)
skb->csum = csum_partial(udph, ipl - ihl, 0);
else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
skb->csum = csum_partial(udph, ul, 0);
else
goto ignore_obscure_skb;
} else {
if (ul != ipl - ihl)
goto ignore_obscure_skb;
skb->csum = csum_partial(udph, ul, 0);
}
udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul,
udplite ? IPPROTO_UDPLITE : IPPROTO_UDP,
skb->csum);
if (!udph->check)
udph->check = CSUM_MANGLED_0;
skb->ip_summed = CHECKSUM_NONE;
ignore_obscure_skb:
return 1;
}
static int tcf_csum_ipv4_igmp(struct sk_buff *skb,
unsigned int ihl, unsigned int ipl)
{
struct igmphdr *igmph;
igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph));
if (igmph == NULL)
return 0;
igmph->csum = 0;
skb->csum = csum_partial(igmph, ipl - ihl, 0);
igmph->csum = csum_fold(skb->csum);
skb->ip_summed = CHECKSUM_NONE;
return 1;
}
static int tcf_csum_ipv4_tcp(struct sk_buff *skb, struct iphdr *iph,
unsigned int ihl, unsigned int ipl)
{
struct tcphdr *tcph;
tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph));
if (tcph == NULL)
return 0;
tcph->check = 0;
skb->csum = csum_partial(tcph, ipl - ihl, 0);
tcph->check = tcp_v4_check(ipl - ihl,
iph->saddr, iph->daddr, skb->csum);
skb->ip_summed = CHECKSUM_NONE;
return 1;
}
static int tcf_csum_sctp(struct sk_buff *skb, unsigned int ihl,
unsigned int ipl)
{
struct sctphdr *sctph;
if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_SCTP)
return 1;
sctph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*sctph));
if (!sctph)
return 0;
sctph->checksum = sctp_compute_cksum(skb,
skb_network_offset(skb) + ihl);
skb->ip_summed = CHECKSUM_NONE;
return 1;
}
static int tcf_csum_ipv4_udp(struct sk_buff *skb, struct iphdr *iph,
unsigned int ihl, unsigned int ipl, int udplite)
{
struct udphdr *udph;
u16 ul;
udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
if (udph == NULL)
return 0;
ul = ntohs(udph->len);
if (udplite || udph->check) {
udph->check = 0;
if (udplite) {
if (ul == 0)
skb->csum = csum_partial(udph, ipl - ihl, 0);
else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
skb->csum = csum_partial(udph, ul, 0);
else
goto ignore_obscure_skb;
} else {
if (ul != ipl - ihl)
goto ignore_obscure_skb;
skb->csum = csum_partial(udph, ul, 0);
}
udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
ul, iph->protocol,
skb->csum);
if (!udph->check)
udph->check = CSUM_MANGLED_0;
}
skb->ip_summed = CHECKSUM_NONE;
ignore_obscure_skb:
return 1;
}
static int tcf_csum_ipv6_icmp(struct sk_buff *skb, struct ipv6hdr *ip6h,
unsigned int ihl, unsigned int ipl)
{
struct icmp6hdr *icmp6h;
icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h));
if (icmp6h == NULL)
return 0;
icmp6h->icmp6_cksum = 0;
skb->csum = csum_partial(icmp6h, ipl - ihl, 0);
icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
ipl - ihl, IPPROTO_ICMPV6,
skb->csum);
skb->ip_summed = CHECKSUM_NONE;
return 1;
}
static int tcf_csum_ipv6_tcp(struct sk_buff *skb,
unsigned int ihl, unsigned int ipl)
{
struct tcphdr *tcph;
const struct ipv6hdr *ip6h;
tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph));
if (tcph == NULL)
return 0;
ip6h = ipv6_hdr(skb);
tcph->check = 0;
skb->csum = csum_partial(tcph, ipl - ihl, 0);
tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
ipl - ihl, IPPROTO_TCP,
skb->csum);
skb->ip_summed = CHECKSUM_NONE;
return 1;
}
static int tcf_csum_ipv4_tcp(struct sk_buff *skb, unsigned int ihl,
unsigned int ipl)
{
struct tcphdr *tcph;
const struct iphdr *iph;
if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
return 1;
tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph));
if (tcph == NULL)
return 0;
iph = ip_hdr(skb);
tcph->check = 0;
skb->csum = csum_partial(tcph, ipl - ihl, 0);
tcph->check = tcp_v4_check(ipl - ihl,
iph->saddr, iph->daddr, skb->csum);
skb->ip_summed = CHECKSUM_NONE;
return 1;
}
