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ipv6: move csum_ipv6_magic() and udp6_csum_init() into static library
As suggested by David, udp6_csum_init() is too big to be inlined, move it to ipv6 static library, net/ipv6/ip6_checksum.c. And the generic csum_ipv6_magic() too. Cc: David S. Miller <davem@davemloft.net> Signed-off-by: Cong Wang <amwang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang
David S. Miller
parent
b7394d2429
commit
acb3e04119
4 changed files with 103 additions and 92 deletions
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@ -35,63 +35,10 @@
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#include <linux/ipv6.h>
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#ifndef _HAVE_ARCH_IPV6_CSUM
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static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
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const struct in6_addr *daddr,
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__u32 len, unsigned short proto,
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__wsum csum)
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{
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int carry;
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__u32 ulen;
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__u32 uproto;
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__u32 sum = (__force u32)csum;
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sum += (__force u32)saddr->s6_addr32[0];
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carry = (sum < (__force u32)saddr->s6_addr32[0]);
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sum += carry;
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sum += (__force u32)saddr->s6_addr32[1];
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carry = (sum < (__force u32)saddr->s6_addr32[1]);
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sum += carry;
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sum += (__force u32)saddr->s6_addr32[2];
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carry = (sum < (__force u32)saddr->s6_addr32[2]);
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sum += carry;
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sum += (__force u32)saddr->s6_addr32[3];
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carry = (sum < (__force u32)saddr->s6_addr32[3]);
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sum += carry;
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sum += (__force u32)daddr->s6_addr32[0];
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carry = (sum < (__force u32)daddr->s6_addr32[0]);
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sum += carry;
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sum += (__force u32)daddr->s6_addr32[1];
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carry = (sum < (__force u32)daddr->s6_addr32[1]);
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sum += carry;
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sum += (__force u32)daddr->s6_addr32[2];
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carry = (sum < (__force u32)daddr->s6_addr32[2]);
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sum += carry;
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sum += (__force u32)daddr->s6_addr32[3];
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carry = (sum < (__force u32)daddr->s6_addr32[3]);
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sum += carry;
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ulen = (__force u32)htonl((__u32) len);
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sum += ulen;
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carry = (sum < ulen);
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sum += carry;
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uproto = (__force u32)htonl(proto);
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sum += uproto;
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carry = (sum < uproto);
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sum += carry;
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return csum_fold((__force __wsum)sum);
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}
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__sum16 csum_ipv6_magic(const struct in6_addr *saddr,
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const struct in6_addr *daddr,
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__u32 len, unsigned short proto,
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__wsum csum);
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#endif
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static __inline__ __sum16 tcp_v6_check(int len,
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@ -126,4 +73,5 @@ static inline void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
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__tcp_v6_send_check(skb, &np->saddr, &np->daddr);
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}
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int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);
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#endif
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@ -40,7 +40,7 @@ obj-$(CONFIG_IPV6_SIT) += sit.o
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obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.o
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obj-$(CONFIG_IPV6_GRE) += ip6_gre.o
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obj-y += addrconf_core.o exthdrs_core.o
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obj-y += addrconf_core.o exthdrs_core.o ip6_checksum.o
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obj-$(CONFIG_INET) += output_core.o protocol.o $(ipv6-offload)
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obj-$(subst m,y,$(CONFIG_IPV6)) += inet6_hashtables.o
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97
net/ipv6/ip6_checksum.c
Normal file
97
net/ipv6/ip6_checksum.c
Normal file
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@ -0,0 +1,97 @@
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#include <net/ip.h>
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#include <net/udp.h>
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#include <net/udplite.h>
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#include <asm/checksum.h>
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#ifndef _HAVE_ARCH_IPV6_CSUM
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__sum16 csum_ipv6_magic(const struct in6_addr *saddr,
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const struct in6_addr *daddr,
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__u32 len, unsigned short proto,
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__wsum csum)
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{
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int carry;
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__u32 ulen;
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__u32 uproto;
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__u32 sum = (__force u32)csum;
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sum += (__force u32)saddr->s6_addr32[0];
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carry = (sum < (__force u32)saddr->s6_addr32[0]);
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sum += carry;
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sum += (__force u32)saddr->s6_addr32[1];
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carry = (sum < (__force u32)saddr->s6_addr32[1]);
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sum += carry;
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sum += (__force u32)saddr->s6_addr32[2];
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carry = (sum < (__force u32)saddr->s6_addr32[2]);
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sum += carry;
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sum += (__force u32)saddr->s6_addr32[3];
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carry = (sum < (__force u32)saddr->s6_addr32[3]);
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sum += carry;
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sum += (__force u32)daddr->s6_addr32[0];
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carry = (sum < (__force u32)daddr->s6_addr32[0]);
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sum += carry;
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sum += (__force u32)daddr->s6_addr32[1];
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carry = (sum < (__force u32)daddr->s6_addr32[1]);
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sum += carry;
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sum += (__force u32)daddr->s6_addr32[2];
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carry = (sum < (__force u32)daddr->s6_addr32[2]);
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sum += carry;
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sum += (__force u32)daddr->s6_addr32[3];
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carry = (sum < (__force u32)daddr->s6_addr32[3]);
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sum += carry;
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ulen = (__force u32)htonl((__u32) len);
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sum += ulen;
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carry = (sum < ulen);
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sum += carry;
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uproto = (__force u32)htonl(proto);
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sum += uproto;
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carry = (sum < uproto);
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sum += carry;
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return csum_fold((__force __wsum)sum);
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}
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EXPORT_SYMBOL(csum_ipv6_magic);
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#endif
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int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto)
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{
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int err;
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UDP_SKB_CB(skb)->partial_cov = 0;
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UDP_SKB_CB(skb)->cscov = skb->len;
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if (proto == IPPROTO_UDPLITE) {
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err = udplite_checksum_init(skb, uh);
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if (err)
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return err;
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}
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if (uh->check == 0) {
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/* RFC 2460 section 8.1 says that we SHOULD log
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this error. Well, it is reasonable.
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*/
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LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
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return 1;
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}
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if (skb->ip_summed == CHECKSUM_COMPLETE &&
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!csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
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skb->len, proto, skb->csum))
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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if (!skb_csum_unnecessary(skb))
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skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
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&ipv6_hdr(skb)->daddr,
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skb->len, proto, 0));
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return 0;
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}
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EXPORT_SYMBOL(udp6_csum_init);
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@ -752,40 +752,6 @@ static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
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return 0;
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}
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static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
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int proto)
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{
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int err;
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UDP_SKB_CB(skb)->partial_cov = 0;
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UDP_SKB_CB(skb)->cscov = skb->len;
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if (proto == IPPROTO_UDPLITE) {
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err = udplite_checksum_init(skb, uh);
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if (err)
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return err;
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}
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if (uh->check == 0) {
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/* RFC 2460 section 8.1 says that we SHOULD log
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this error. Well, it is reasonable.
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*/
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LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
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return 1;
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}
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if (skb->ip_summed == CHECKSUM_COMPLETE &&
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!csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
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skb->len, proto, skb->csum))
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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if (!skb_csum_unnecessary(skb))
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skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
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&ipv6_hdr(skb)->daddr,
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skb->len, proto, 0));
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return 0;
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}
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int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
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int proto)
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{
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