Question about IPv4 packet checking in br_nf_pre_routing() function
Hello everyone,
I am working on Linux bridge netfilter. And to meet a special request, I would need to remove the pskb_trim_rcsum() in bridge netfilter processing for IPv4 packet. Will be there any side effect if I removed this IPv4 check method pskb_trim_rcsum() used in br_nf_pre_routing() function? Thanks. The kernel code is as following: ... if (!pskb_may_pull(skb, sizeof(struct iphdr))) goto inhdr_error; iph = ip_hdr(skb); if (iph->ihl < 5 || iph->version != 4) goto inhdr_error; if (!pskb_may_pull(skb, 4 * iph->ihl)) goto inhdr_error; iph = ip_hdr(skb); if (ip_fast_csum((__u8 *) iph, iph->ihl) != 0) goto inhdr_error; len = ntohs(iph->tot_len); if (skb->len < len || len < 4 * iph->ihl) goto inhdr_error; pskb_trim_rcsum(skb, len); |
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