on Xen-source compilation i get :
CC [M] net/ipv4/netfilter/ipt_policy.o
CC [M] net/ipv4/netfilter/ipt_REJECT.o
net/ipv4/netfilter/ipt_REJECT.c: In function 'send_reset':
net/ipv4/netfilter/ipt_REJECT.c:162: erreur: 'struct skb_shared_info' has no member named 'tso_size'
net/ipv4/netfilter/ipt_REJECT.c:163: erreur: 'struct skb_shared_info' has no member named 'tso_segs'
make[3]: *** [net/ipv4/netfilter/ipt_REJECT.o] Erreur 1
make[2]: *** [net/ipv4/netfilter] Erreur 2
make[1]: *** [net/ipv4] Erreur 2
make: *** [net] Erreur 2