net/ipv6/ila/ila_common.c

Source file repositories/reference/linux-study-clean/net/ipv6/ila/ila_common.c

File Facts

System
Linux kernel
Corpus path
net/ipv6/ila/ila_common.c
Extension
.c
Size
3970 bytes
Lines
157
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: implementation source
Status
source implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

if (likely(pskb_may_pull(skb, nhoff + sizeof(struct tcphdr)))) {
			struct tcphdr *th = (struct tcphdr *)
					(skb_network_header(skb) + nhoff);

			diff = get_csum_diff(ip6h, p);
			inet_proto_csum_replace_by_diff(&th->check, skb,
							diff, true, true);
		}
		break;
	case NEXTHDR_UDP:
		if (likely(pskb_may_pull(skb, nhoff + sizeof(struct udphdr)))) {
			struct udphdr *uh = (struct udphdr *)
					(skb_network_header(skb) + nhoff);

			if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
				diff = get_csum_diff(ip6h, p);
				inet_proto_csum_replace_by_diff(&uh->check, skb,
								diff, true, true);
				if (!uh->check)
					uh->check = CSUM_MANGLED_0;
			}
		}
		break;
	case NEXTHDR_ICMP:
		if (likely(pskb_may_pull(skb,
					 nhoff + sizeof(struct icmp6hdr)))) {
			struct icmp6hdr *ih = (struct icmp6hdr *)
					(skb_network_header(skb) + nhoff);

			diff = get_csum_diff(ip6h, p);
			inet_proto_csum_replace_by_diff(&ih->icmp6_cksum, skb,
							diff, true, true);
		}
		break;
	}
}

void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p,
			     bool sir2ila)
{
	struct ipv6hdr *ip6h = ipv6_hdr(skb);
	struct ila_addr *iaddr = ila_a2i(&ip6h->daddr);

	switch (p->csum_mode) {
	case ILA_CSUM_ADJUST_TRANSPORT:
		ila_csum_adjust_transport(skb, p);
		break;
	case ILA_CSUM_NEUTRAL_MAP:
		if (sir2ila) {
			if (WARN_ON(ila_csum_neutral_set(iaddr->ident))) {
				/* Checksum flag should never be
				 * set in a formatted SIR address.
				 */
				break;
			}
		} else if (!ila_csum_neutral_set(iaddr->ident)) {
			/* ILA to SIR translation and C-bit isn't
			 * set so we're good.
			 */
			break;
		}
		ila_csum_do_neutral_fmt(iaddr, p);
		break;
	case ILA_CSUM_NEUTRAL_MAP_AUTO:
		ila_csum_do_neutral_nofmt(iaddr, p);
		break;
	case ILA_CSUM_NO_ACTION:
		break;
	}

	/* Now change destination address */
	iaddr->loc = p->locator;
}

Annotation

Implementation Notes