net/ipv6/ioam6_iptunnel.c

Source file repositories/reference/linux-study-clean/net/ipv6/ioam6_iptunnel.c

File Facts

System
Linux kernel
Corpus path
net/ipv6/ioam6_iptunnel.c
Extension
.c
Size
14994 bytes
Lines
563
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

struct ioam6_lwt_encap {
	struct ipv6_hopopt_hdr eh;
	u8 pad[2];			/* 2-octet padding for 4n-alignment */
	struct ioam6_hdr ioamh;
	struct ioam6_trace_hdr traceh;
} __packed;

struct ioam6_lwt_freq {
	u32 k;
	u32 n;
};

struct ioam6_lwt {
	struct dst_entry null_dst;
	struct dst_cache cache;
	struct ioam6_lwt_freq freq;
	atomic_t pkt_cnt;
	u8 mode;
	bool has_tunsrc;
	struct in6_addr tunsrc;
	struct in6_addr tundst;
	struct ioam6_lwt_encap tuninfo;
};

static const struct netlink_range_validation freq_range = {
	.min = IOAM6_IPTUNNEL_FREQ_MIN,
	.max = IOAM6_IPTUNNEL_FREQ_MAX,
};

static struct ioam6_lwt *ioam6_lwt_state(struct lwtunnel_state *lwt)
{
	return (struct ioam6_lwt *)lwt->data;
}

static struct ioam6_lwt_encap *ioam6_lwt_info(struct lwtunnel_state *lwt)
{
	return &ioam6_lwt_state(lwt)->tuninfo;
}

static struct ioam6_trace_hdr *ioam6_lwt_trace(struct lwtunnel_state *lwt)
{
	return &(ioam6_lwt_state(lwt)->tuninfo.traceh);
}

static const struct nla_policy ioam6_iptunnel_policy[IOAM6_IPTUNNEL_MAX + 1] = {
	[IOAM6_IPTUNNEL_FREQ_K] = NLA_POLICY_FULL_RANGE(NLA_U32, &freq_range),
	[IOAM6_IPTUNNEL_FREQ_N] = NLA_POLICY_FULL_RANGE(NLA_U32, &freq_range),
	[IOAM6_IPTUNNEL_MODE]	= NLA_POLICY_RANGE(NLA_U8,
						   IOAM6_IPTUNNEL_MODE_MIN,
						   IOAM6_IPTUNNEL_MODE_MAX),
	[IOAM6_IPTUNNEL_SRC]	= NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
	[IOAM6_IPTUNNEL_DST]	= NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
	[IOAM6_IPTUNNEL_TRACE]	= NLA_POLICY_EXACT_LEN(
					sizeof(struct ioam6_trace_hdr)),
};

static bool ioam6_validate_trace_hdr(struct ioam6_trace_hdr *trace)
{
	u32 fields;

	if (!trace->type_be32 || !trace->remlen ||
	    trace->remlen > IOAM6_TRACE_DATA_SIZE_MAX / 4 ||
	    trace->type.bit12 | trace->type.bit13 | trace->type.bit14 |
	    trace->type.bit15 | trace->type.bit16 | trace->type.bit17 |
	    trace->type.bit18 | trace->type.bit19 | trace->type.bit20 |
	    trace->type.bit21 | trace->type.bit23)
		return false;

	fields = be32_to_cpu(trace->type_be32);
	trace->nodelen = ioam6_trace_compute_nodelen(fields);

	return true;
}

static int ioam6_build_state(struct net *net, struct nlattr *nla,
			     unsigned int family, const void *cfg,
			     struct lwtunnel_state **ts,
			     struct netlink_ext_ack *extack)
{
	struct nlattr *tb[IOAM6_IPTUNNEL_MAX + 1];
	struct ioam6_lwt_encap *tuninfo;
	struct ioam6_trace_hdr *trace;
	struct lwtunnel_state *lwt;
	struct ioam6_lwt *ilwt;
	int len_aligned, err;
	u32 freq_k, freq_n;
	u8 mode;

	if (family != AF_INET6)
		return -EINVAL;

Annotation

Implementation Notes