diff options
Diffstat (limited to 'net/ipv4/ipvs/ip_vs_proto_tcp.c')
-rw-r--r-- | net/ipv4/ipvs/ip_vs_proto_tcp.c | 37 |
1 files changed, 35 insertions, 2 deletions
diff --git a/net/ipv4/ipvs/ip_vs_proto_tcp.c b/net/ipv4/ipvs/ip_vs_proto_tcp.c index 808e8be0280..537f616776d 100644 --- a/net/ipv4/ipvs/ip_vs_proto_tcp.c +++ b/net/ipv4/ipvs/ip_vs_proto_tcp.c @@ -134,12 +134,34 @@ tcp_fast_csum_update(int af, struct tcphdr *tcph, } +static inline void +tcp_partial_csum_update(int af, struct tcphdr *tcph, + const union nf_inet_addr *oldip, + const union nf_inet_addr *newip, + __be16 oldlen, __be16 newlen) +{ +#ifdef CONFIG_IP_VS_IPV6 + if (af == AF_INET6) + tcph->check = + csum_fold(ip_vs_check_diff16(oldip->ip6, newip->ip6, + ip_vs_check_diff2(oldlen, newlen, + ~csum_unfold(tcph->check)))); + else +#endif + tcph->check = + csum_fold(ip_vs_check_diff4(oldip->ip, newip->ip, + ip_vs_check_diff2(oldlen, newlen, + ~csum_unfold(tcph->check)))); +} + + static int tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp, struct ip_vs_conn *cp) { struct tcphdr *tcph; unsigned int tcphoff; + int oldlen; #ifdef CONFIG_IP_VS_IPV6 if (cp->af == AF_INET6) @@ -147,6 +169,7 @@ tcp_snat_handler(struct sk_buff *skb, else #endif tcphoff = ip_hdrlen(skb); + oldlen = skb->len - tcphoff; /* csum_check requires unshared skb */ if (!skb_make_writable(skb, tcphoff+sizeof(*tcph))) @@ -166,7 +189,11 @@ tcp_snat_handler(struct sk_buff *skb, tcph->source = cp->vport; /* Adjust TCP checksums */ - if (!cp->app && (tcph->check != 0)) { + if (skb->ip_summed == CHECKSUM_PARTIAL) { + tcp_partial_csum_update(cp->af, tcph, &cp->daddr, &cp->vaddr, + htonl(oldlen), + htonl(skb->len - tcphoff)); + } else if (!cp->app) { /* Only port and addr are changed, do fast csum update */ tcp_fast_csum_update(cp->af, tcph, &cp->daddr, &cp->vaddr, cp->dport, cp->vport); @@ -204,6 +231,7 @@ tcp_dnat_handler(struct sk_buff *skb, { struct tcphdr *tcph; unsigned int tcphoff; + int oldlen; #ifdef CONFIG_IP_VS_IPV6 if (cp->af == AF_INET6) @@ -211,6 +239,7 @@ tcp_dnat_handler(struct sk_buff *skb, else #endif tcphoff = ip_hdrlen(skb); + oldlen = skb->len - tcphoff; /* csum_check requires unshared skb */ if (!skb_make_writable(skb, tcphoff+sizeof(*tcph))) @@ -235,7 +264,11 @@ tcp_dnat_handler(struct sk_buff *skb, /* * Adjust TCP checksums */ - if (!cp->app && (tcph->check != 0)) { + if (skb->ip_summed == CHECKSUM_PARTIAL) { + tcp_partial_csum_update(cp->af, tcph, &cp->daddr, &cp->vaddr, + htonl(oldlen), + htonl(skb->len - tcphoff)); + } else if (!cp->app) { /* Only port and addr are changed, do fast csum update */ tcp_fast_csum_update(cp->af, tcph, &cp->vaddr, &cp->daddr, cp->vport, cp->dport); |