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Currently TCP uses the 'flow' epoll_ref field for both connected sockets and timers, which consists of just the index of the relevant flow (connection). This is just fine for timers, for while it obviously works, it's subtly incomplete for sockets on spliced connections. In that case we want to know which side of the connection the event is occurring on as well as which connection. At present, we deduce that information by looking at the actual fd, and comparing it to the fds of the sockets on each side. When we use the flow table for more things, we expect more cases where something will need to know a specific side of a specific flow for an event, but nothing more. Therefore add a new 'flowside' epoll_ref field, with exactly that information. We use it for TCP connected sockets. This allows us to directly know the side for spliced connections. For "tap" connections, it's pretty meaningless, since the side is always the socket side. It still makes logical sense though, and it may become important for future flow table work. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright Red Hat
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* Author: David Gibson <david@gibson.dropbear.id.au>
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*
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* Tracking for logical "flows" of packets.
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*/
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#ifndef FLOW_H
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#define FLOW_H
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/**
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* enum flow_type - Different types of packet flows we track
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*/
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enum flow_type {
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/* Represents an invalid or unused flow */
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FLOW_TYPE_NONE = 0,
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/* A TCP connection between a socket and tap interface */
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FLOW_TCP,
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/* A TCP connection between a host socket and ns socket */
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FLOW_TCP_SPLICE,
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FLOW_NUM_TYPES,
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};
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extern const char *flow_type_str[];
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#define FLOW_TYPE(f) \
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((f)->type < FLOW_NUM_TYPES ? flow_type_str[(f)->type] : "?")
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/**
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* struct flow_common - Common fields for packet flows
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* @type: Type of packet flow
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*/
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struct flow_common {
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uint8_t type;
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};
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#define FLOW_INDEX_BITS 17 /* 128k - 1 */
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#define FLOW_MAX MAX_FROM_BITS(FLOW_INDEX_BITS)
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#define FLOW_TABLE_PRESSURE 30 /* % of FLOW_MAX */
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#define FLOW_FILE_PRESSURE 30 /* % of c->nofile */
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/**
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* struct flow_sidx - ID for one side of a specific flow
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* @side: Side referenced (0 or 1)
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* @flow: Index of flow referenced
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*/
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typedef struct flow_sidx {
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unsigned side :1;
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unsigned flow :FLOW_INDEX_BITS;
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} flow_sidx_t;
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static_assert(sizeof(flow_sidx_t) <= sizeof(uint32_t),
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"flow_sidx_t must fit within 32 bits");
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#define FLOW_SIDX_NONE ((flow_sidx_t){ .flow = FLOW_MAX })
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union flow;
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void flow_table_compact(struct ctx *c, union flow *hole);
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void flow_log_(const struct flow_common *f, int pri, const char *fmt, ...)
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__attribute__((format(printf, 3, 4)));
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#define flow_log(f_, pri, ...) flow_log_(&(f_)->f, (pri), __VA_ARGS__)
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#define flow_dbg(f, ...) flow_log((f), LOG_DEBUG, __VA_ARGS__)
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#define flow_err(f, ...) flow_log((f), LOG_ERR, __VA_ARGS__)
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#define flow_trace(f, ...) \
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do { \
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if (log_trace) \
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flow_dbg((f), __VA_ARGS__); \
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} while (0)
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#endif /* FLOW_H */
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