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icmp: Store ping socket information in flow table
Currently icmp_id_map[][] stores information about ping sockets in a bespoke structure. Move the same information into new types of flow in the flow table. To match that change, replace the existing ICMP timer with a flow-based timer for expiring ping sockets. This has the advantage that we only need to scan the active flows, not all possible ids. We convert icmp_id_map[][] to point to the flow table entries, rather than containing its own information. We do still use that array for locating the right ping flows, rather than using a "flow native" form of lookup for the time being. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> [sbrivio: Update id_sock description in comment to icmp_ping_new()] Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson
Stefano Brivio
parent
383a6f67e5
commit
3af5e9fdba
6
Makefile
6
Makefile
@ -54,9 +54,9 @@ SRCS = $(PASST_SRCS) $(QRAP_SRCS)
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MANPAGES = passt.1 pasta.1 qrap.1
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PASST_HEADERS = arch.h arp.h checksum.h conf.h dhcp.h dhcpv6.h flow.h fwd.h \
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flow_table.h icmp.h inany.h iov.h ip.h isolation.h lineread.h log.h \
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ndp.h netlink.h packet.h passt.h pasta.h pcap.h pif.h siphash.h tap.h \
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tcp.h tcp_conn.h tcp_splice.h udp.h util.h
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flow_table.h icmp.h icmp_flow.h inany.h iov.h ip.h isolation.h \
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lineread.h log.h ndp.h netlink.h packet.h passt.h pasta.h pcap.h pif.h \
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siphash.h tap.h tcp.h tcp_conn.h tcp_splice.h udp.h util.h
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HEADERS = $(PASST_HEADERS) seccomp.h
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C := \#include <linux/tcp.h>\nstruct tcp_info x = { .tcpi_snd_wnd = 0 };
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9
flow.c
9
flow.c
@ -22,6 +22,8 @@ const char *flow_type_str[] = {
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[FLOW_TYPE_NONE] = "<none>",
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[FLOW_TCP] = "TCP connection",
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[FLOW_TCP_SPLICE] = "TCP connection (spliced)",
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[FLOW_PING4] = "ICMP ping sequence",
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[FLOW_PING6] = "ICMPv6 ping sequence",
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};
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static_assert(ARRAY_SIZE(flow_type_str) == FLOW_NUM_TYPES,
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"flow_type_str[] doesn't match enum flow_type");
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@ -29,6 +31,8 @@ static_assert(ARRAY_SIZE(flow_type_str) == FLOW_NUM_TYPES,
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const uint8_t flow_proto[] = {
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[FLOW_TCP] = IPPROTO_TCP,
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[FLOW_TCP_SPLICE] = IPPROTO_TCP,
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[FLOW_PING4] = IPPROTO_ICMP,
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[FLOW_PING6] = IPPROTO_ICMPV6,
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};
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static_assert(ARRAY_SIZE(flow_proto) == FLOW_NUM_TYPES,
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"flow_proto[] doesn't match enum flow_type");
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@ -295,6 +299,11 @@ void flow_defer_handler(const struct ctx *c, const struct timespec *now)
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if (!closed && timer)
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tcp_splice_timer(c, flow);
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break;
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case FLOW_PING4:
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case FLOW_PING6:
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if (timer)
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closed = icmp_ping_timer(c, flow, now);
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break;
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default:
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/* Assume other flow types don't need any handling */
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;
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4
flow.h
4
flow.h
@ -19,6 +19,10 @@ enum flow_type {
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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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/* ICMP echo requests from guest to host and matching replies back */
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FLOW_PING4,
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/* ICMPv6 echo requests from guest to host and matching replies back */
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FLOW_PING6,
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FLOW_NUM_TYPES,
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};
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@ -8,6 +8,7 @@
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#define FLOW_TABLE_H
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#include "tcp_conn.h"
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#include "icmp_flow.h"
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/**
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* struct flow_free_cluster - Information about a cluster of free entries
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@ -33,6 +34,7 @@ union flow {
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struct flow_free_cluster free;
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struct tcp_tap_conn tcp;
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struct tcp_splice_conn tcp_splice;
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struct icmp_ping_flow ping;
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};
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/* Global Flow Table */
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147
icmp.c
147
icmp.c
@ -40,24 +40,17 @@
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#include "siphash.h"
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#include "inany.h"
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#include "icmp.h"
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#include "flow_table.h"
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#define ICMP_ECHO_TIMEOUT 60 /* s, timeout for ICMP socket activity */
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#define ICMP_NUM_IDS (1U << 16)
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/**
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* struct icmp_id_sock - Tracking information for single ICMP echo identifier
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* @sock: Bound socket for identifier
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* @seq: Last sequence number sent to tap, host order, -1: not sent yet
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* @ts: Last associated activity from tap, seconds
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*/
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struct icmp_id_sock {
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int sock;
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int seq;
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time_t ts;
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};
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/* Sides of a flow as we use them for ping streams */
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#define SOCKSIDE 0
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#define TAPSIDE 1
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/* Indexed by ICMP echo identifier */
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static struct icmp_id_sock icmp_id_map[IP_VERSIONS][ICMP_NUM_IDS];
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static struct icmp_ping_flow *icmp_id_map[IP_VERSIONS][ICMP_NUM_IDS];
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/**
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* icmp_sock_handler() - Handle new data from ICMP or ICMPv6 socket
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@ -67,8 +60,8 @@ static struct icmp_id_sock icmp_id_map[IP_VERSIONS][ICMP_NUM_IDS];
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*/
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void icmp_sock_handler(const struct ctx *c, sa_family_t af, union epoll_ref ref)
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{
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struct icmp_id_sock *const id_sock = af == AF_INET
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? &icmp_id_map[V4][ref.icmp.id] : &icmp_id_map[V6][ref.icmp.id];
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struct icmp_ping_flow *pingf = af == AF_INET
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? icmp_id_map[V4][ref.icmp.id] : icmp_id_map[V6][ref.icmp.id];
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const char *const pname = af == AF_INET ? "ICMP" : "ICMPv6";
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union sockaddr_inany sr;
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socklen_t sl = sizeof(sr);
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@ -79,6 +72,8 @@ void icmp_sock_handler(const struct ctx *c, sa_family_t af, union epoll_ref ref)
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if (c->no_icmp)
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return;
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ASSERT(pingf);
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n = recvfrom(ref.fd, buf, sizeof(buf), 0, &sr.sa, &sl);
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if (n < 0) {
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warn("%s: recvfrom() error on ping socket: %s",
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@ -113,10 +108,10 @@ void icmp_sock_handler(const struct ctx *c, sa_family_t af, union epoll_ref ref)
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/* In PASTA mode, we'll get any reply we send, discard them. */
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if (c->mode == MODE_PASTA) {
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if (id_sock->seq == seq)
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if (pingf->seq == seq)
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return;
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id_sock->seq = seq;
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pingf->seq = seq;
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}
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debug("%s: echo reply to tap, ID: %"PRIu16", seq: %"PRIu16, pname,
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@ -133,36 +128,52 @@ unexpected:
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}
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/**
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* icmp_ping_close() - Close and clean up a ping socket
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* icmp_ping_close() - Close and clean up a ping flow
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* @c: Execution context
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* @id_sock: Socket number and other info
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* @pingf: ping flow entry to close
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*/
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static void icmp_ping_close(const struct ctx *c, struct icmp_id_sock *id_sock)
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static void icmp_ping_close(const struct ctx *c,
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const struct icmp_ping_flow *pingf)
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{
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epoll_ctl(c->epollfd, EPOLL_CTL_DEL, id_sock->sock, NULL);
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close(id_sock->sock);
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id_sock->sock = -1;
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id_sock->seq = -1;
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uint16_t id = pingf->id;
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epoll_ctl(c->epollfd, EPOLL_CTL_DEL, pingf->sock, NULL);
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close(pingf->sock);
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if (pingf->f.type == FLOW_PING4)
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icmp_id_map[V4][id] = NULL;
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else
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icmp_id_map[V6][id] = NULL;
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}
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/**
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* icmp_ping_new() - Prepare a new ping socket for a new id
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* @c: Execution context
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* @id_sock: Socket fd and other information
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* @id_sock: Pointer to ping flow entry slot in icmp_id_map[] to update
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* @af: Address family, AF_INET or AF_INET6
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* @id: ICMP id for the new socket
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*
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* Return: Newly opened ping socket fd, or -1 on failure
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* Return: Newly opened ping flow, or NULL on failure
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*/
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static int icmp_ping_new(const struct ctx *c, struct icmp_id_sock *id_sock,
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sa_family_t af, uint16_t id)
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static struct icmp_ping_flow *icmp_ping_new(const struct ctx *c,
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struct icmp_ping_flow **id_sock,
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sa_family_t af, uint16_t id)
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{
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uint8_t proto = af == AF_INET ? IPPROTO_ICMP : IPPROTO_ICMPV6;
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const char *const pname = af == AF_INET ? "ICMP" : "ICMPv6";
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uint8_t flowtype = af == AF_INET ? FLOW_PING4 : FLOW_PING6;
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union icmp_epoll_ref iref = { .id = id };
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union flow *flow = flow_alloc();
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struct icmp_ping_flow *pingf;
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const void *bind_addr;
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const char *bind_if;
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int s;
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if (!flow)
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return NULL;
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pingf = FLOW_START(flow, flowtype, ping, TAPSIDE);
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pingf->seq = -1;
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pingf->id = id;
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if (af == AF_INET) {
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bind_addr = &c->ip4.addr_out;
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@ -172,28 +183,28 @@ static int icmp_ping_new(const struct ctx *c, struct icmp_id_sock *id_sock,
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bind_if = c->ip6.ifname_out;
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}
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s = sock_l4(c, af, proto, bind_addr, bind_if, 0, iref.u32);
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pingf->sock = sock_l4(c, af, flow_proto[flowtype], bind_addr, bind_if,
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0, iref.u32);
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if (s < 0) {
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if (pingf->sock < 0) {
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warn("Cannot open \"ping\" socket. You might need to:");
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warn(" sysctl -w net.ipv4.ping_group_range=\"0 2147483647\"");
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warn("...echo requests/replies will fail.");
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goto cancel;
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}
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if (s > FD_REF_MAX)
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if (pingf->sock > FD_REF_MAX)
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goto cancel;
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id_sock->sock = s;
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*id_sock = pingf;
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debug("%s: new socket %i for echo ID %"PRIu16, pname, s, id);
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debug("%s: new socket %i for echo ID %"PRIu16, pname, pingf->sock, id);
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return s;
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return pingf;
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cancel:
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if (s >= 0)
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close(s);
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return -1;
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flow_alloc_cancel(flow);
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return NULL;
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}
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/**
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@ -215,14 +226,13 @@ int icmp_tap_handler(const struct ctx *c, uint8_t pif, sa_family_t af,
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const char *const pname = af == AF_INET ? "ICMP" : "ICMPv6";
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union sockaddr_inany sa = { .sa_family = af };
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const socklen_t sl = af == AF_INET ? sizeof(sa.sa4) : sizeof(sa.sa6);
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struct icmp_id_sock *id_sock;
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struct icmp_ping_flow *pingf, **id_sock;
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uint16_t id, seq;
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size_t plen;
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void *pkt;
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int s;
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(void)saddr;
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(void)pif;
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ASSERT(pif == PIF_TAP);
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if (af == AF_INET) {
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const struct icmphdr *ih;
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@ -261,13 +271,13 @@ int icmp_tap_handler(const struct ctx *c, uint8_t pif, sa_family_t af,
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ASSERT(0);
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}
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if ((s = id_sock->sock) < 0)
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if ((s = icmp_ping_new(c, id_sock, af, id)) < 0)
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if (!(pingf = *id_sock))
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if (!(pingf = icmp_ping_new(c, id_sock, af, id)))
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return 1;
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id_sock->ts = now->tv_sec;
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pingf->ts = now->tv_sec;
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if (sendto(s, pkt, plen, MSG_NOSIGNAL, &sa.sa, sl) < 0) {
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if (sendto(pingf->sock, pkt, plen, MSG_NOSIGNAL, &sa.sa, sl) < 0) {
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debug("%s: failed to relay request to socket: %s",
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pname, strerror(errno));
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} else {
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@ -279,44 +289,21 @@ int icmp_tap_handler(const struct ctx *c, uint8_t pif, sa_family_t af,
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}
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/**
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* icmp_timer_one() - Handler for timed events related to a given identifier
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* icmp_ping_timer() - Handler for timed events related to a given flow
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* @c: Execution context
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* @id_sock: Socket fd and activity timestamp
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* @flow: flow table entry to check for timeout
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* @now: Current timestamp
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*
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* Return: true if the flow is ready to free, false otherwise
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*/
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static void icmp_timer_one(const struct ctx *c, struct icmp_id_sock *id_sock,
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const struct timespec *now)
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bool icmp_ping_timer(const struct ctx *c, union flow *flow,
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const struct timespec *now)
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{
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if (id_sock->sock < 0 || now->tv_sec - id_sock->ts <= ICMP_ECHO_TIMEOUT)
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return;
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const struct icmp_ping_flow *pingf = &flow->ping;
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icmp_ping_close(c, id_sock);
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}
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/**
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* icmp_timer() - Scan activity bitmap for identifiers with timed events
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* @c: Execution context
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* @now: Current timestamp
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*/
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void icmp_timer(const struct ctx *c, const struct timespec *now)
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{
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unsigned int i;
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for (i = 0; i < ICMP_NUM_IDS; i++) {
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icmp_timer_one(c, &icmp_id_map[V4][i], now);
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icmp_timer_one(c, &icmp_id_map[V6][i], now);
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}
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}
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/**
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* icmp_init() - Initialise sequences in ID map to -1 (no sequence sent yet)
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*/
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void icmp_init(void)
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{
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unsigned i;
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for (i = 0; i < ICMP_NUM_IDS; i++) {
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icmp_id_map[V4][i].seq = icmp_id_map[V6][i].seq = -1;
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icmp_id_map[V4][i].sock = icmp_id_map[V6][i].sock = -1;
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}
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if (now->tv_sec - pingf->ts <= ICMP_ECHO_TIMEOUT)
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return false;
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icmp_ping_close(c, pingf);
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return true;
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}
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2
icmp.h
2
icmp.h
@ -9,12 +9,12 @@
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#define ICMP_TIMER_INTERVAL 10000 /* ms */
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struct ctx;
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struct icmp_ping_flow;
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void icmp_sock_handler(const struct ctx *c, sa_family_t af, union epoll_ref ref);
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int icmp_tap_handler(const struct ctx *c, uint8_t pif, sa_family_t af,
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const void *saddr, const void *daddr,
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const struct pool *p, const struct timespec *now);
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void icmp_timer(const struct ctx *c, const struct timespec *now);
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void icmp_init(void);
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/**
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31
icmp_flow.h
Normal file
31
icmp_flow.h
Normal file
@ -0,0 +1,31 @@
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/* 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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* ICMP flow tracking data structures
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*/
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#ifndef ICMP_FLOW_H
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#define ICMP_FLOW_H
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/**
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* struct icmp_ping_flow - Descriptor for a flow of ping requests/replies
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* @f: Generic flow information
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* @seq: Last sequence number sent to tap, host order, -1: not sent yet
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* @sock: "ping" socket
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* @ts: Last associated activity from tap, seconds
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* @id: ICMP id for the flow as seen by the guest
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*/
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struct icmp_ping_flow {
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/* Must be first element */
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struct flow_common f;
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int seq;
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int sock;
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time_t ts;
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uint16_t id;
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};
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bool icmp_ping_timer(const struct ctx *c, union flow *flow,
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const struct timespec *now);
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#endif /* ICMP_FLOW_H */
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5
passt.c
5
passt.c
@ -106,8 +106,6 @@ static void post_handler(struct ctx *c, const struct timespec *now)
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CALL_PROTO_HANDLER(c, now, tcp, TCP);
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/* NOLINTNEXTLINE(bugprone-branch-clone): intervals can be the same */
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CALL_PROTO_HANDLER(c, now, udp, UDP);
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/* NOLINTNEXTLINE(bugprone-branch-clone): intervals can be the same */
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CALL_PROTO_HANDLER(c, now, icmp, ICMP);
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flow_defer_handler(c, now);
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#undef CALL_PROTO_HANDLER
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@ -288,9 +286,6 @@ int main(int argc, char **argv)
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if ((!c.no_udp && udp_init(&c)) || (!c.no_tcp && tcp_init(&c)))
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exit(EXIT_FAILURE);
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if (!c.no_icmp)
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icmp_init();
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proto_update_l2_buf(c.mac_guest, c.mac);
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if (c.ifi4 && !c.no_dhcp)
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