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Wed, 22 Oct 2025 15:48:26 GMT (envelope-from git) Date: Wed, 22 Oct 2025 15:48:26 GMT Message-Id: <202510221548.59MFmQ7U022202@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Mark Johnston Subject: git: 25e065774302 - stable/15 - so_reuseport_lb_test: Add a test case for connected UDP sockets List-Id: Commits to the stable branches of the FreeBSD src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-branches List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-branches@freebsd.org Sender: owner-dev-commits-src-branches@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: markj X-Git-Repository: src X-Git-Refname: refs/heads/stable/15 X-Git-Reftype: branch X-Git-Commit: 25e065774302591b43a263a78362a816f799f715 Auto-Submitted: auto-generated The branch stable/15 has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=25e065774302591b43a263a78362a816f799f715 commit 25e065774302591b43a263a78362a816f799f715 Author: Mark Johnston AuthorDate: 2025-10-22 14:53:28 +0000 Commit: Mark Johnston CommitDate: 2025-10-22 15:48:08 +0000 so_reuseport_lb_test: Add a test case for connected UDP sockets Approved by: so (cherry picked from commit 1dd66c6ac2c146f540b2ff825fbee442354aeee5) --- tests/sys/netinet/so_reuseport_lb_test.c | 148 +++++++++++++++++++++++++++++++ 1 file changed, 148 insertions(+) diff --git a/tests/sys/netinet/so_reuseport_lb_test.c b/tests/sys/netinet/so_reuseport_lb_test.c index fa9d6e425884..31d20160cb5a 100644 --- a/tests/sys/netinet/so_reuseport_lb_test.c +++ b/tests/sys/netinet/so_reuseport_lb_test.c @@ -29,6 +29,8 @@ #include #include +#include +#include #include #include @@ -551,6 +553,150 @@ ATF_TC_BODY(connect_bound, tc) close(s); } +/* + * The kernel erroneously permits calling connect() on a UDP socket with + * SO_REUSEPORT_LB set. Verify that packets sent to the bound address are + * dropped unless they come from the connected address. + */ +ATF_TC_WITHOUT_HEAD(connect_udp); +ATF_TC_BODY(connect_udp, tc) +{ + struct sockaddr_in sin = { + .sin_family = AF_INET, + .sin_len = sizeof(sin), + .sin_addr = { htonl(INADDR_LOOPBACK) }, + }; + ssize_t n; + int error, len, s1, s2, s3; + char ch; + + s1 = socket(PF_INET, SOCK_DGRAM, 0); + ATF_REQUIRE(s1 >= 0); + s2 = socket(PF_INET, SOCK_DGRAM, 0); + ATF_REQUIRE(s2 >= 0); + s3 = socket(PF_INET, SOCK_DGRAM, 0); + ATF_REQUIRE(s3 >= 0); + + error = setsockopt(s1, SOL_SOCKET, SO_REUSEPORT_LB, (int[]){1}, + sizeof(int)); + ATF_REQUIRE_MSG(error == 0, + "setsockopt(SO_REUSEPORT_LB) failed: %s", strerror(errno)); + error = bind(s1, (struct sockaddr *)&sin, sizeof(sin)); + ATF_REQUIRE_MSG(error == 0, "bind() failed: %s", strerror(errno)); + + error = bind(s2, (struct sockaddr *)&sin, sizeof(sin)); + ATF_REQUIRE_MSG(error == 0, "bind() failed: %s", strerror(errno)); + + error = bind(s3, (struct sockaddr *)&sin, sizeof(sin)); + ATF_REQUIRE_MSG(error == 0, "bind() failed: %s", strerror(errno)); + + /* Connect to an address not owned by s2. */ + error = getsockname(s3, (struct sockaddr *)&sin, + (socklen_t[]){sizeof(sin)}); + ATF_REQUIRE(error == 0); + error = connect(s1, (struct sockaddr *)&sin, sizeof(sin)); + ATF_REQUIRE_MSG(error == 0, "connect() failed: %s", strerror(errno)); + + /* Try to send a packet to s1 from s2. */ + error = getsockname(s1, (struct sockaddr *)&sin, + (socklen_t[]){sizeof(sin)}); + ATF_REQUIRE(error == 0); + + ch = 42; + n = sendto(s2, &ch, sizeof(ch), 0, (struct sockaddr *)&sin, + sizeof(sin)); + ATF_REQUIRE(n == 1); + + /* Give the packet some time to arrive. */ + usleep(100000); + + /* s1 is connected to s3 and shouldn't receive from s2. */ + error = ioctl(s1, FIONREAD, &len); + ATF_REQUIRE(error == 0); + ATF_REQUIRE_MSG(len == 0, "unexpected data available"); + + /* ... but s3 can of course send to s1. */ + n = sendto(s3, &ch, sizeof(ch), 0, (struct sockaddr *)&sin, + sizeof(sin)); + ATF_REQUIRE(n == 1); + usleep(100000); + error = ioctl(s1, FIONREAD, &len); + ATF_REQUIRE(error == 0); + ATF_REQUIRE_MSG(len == 1, "expected data available"); +} + +/* + * The kernel erroneously permits calling connect() on a UDP socket with + * SO_REUSEPORT_LB set. Verify that packets sent to the bound address are + * dropped unless they come from the connected address. + */ +ATF_TC_WITHOUT_HEAD(connect_udp6); +ATF_TC_BODY(connect_udp6, tc) +{ + struct sockaddr_in6 sin6 = { + .sin6_family = AF_INET6, + .sin6_len = sizeof(sin6), + .sin6_addr = IN6ADDR_LOOPBACK_INIT, + }; + ssize_t n; + int error, len, s1, s2, s3; + char ch; + + s1 = socket(PF_INET6, SOCK_DGRAM, 0); + ATF_REQUIRE(s1 >= 0); + s2 = socket(PF_INET6, SOCK_DGRAM, 0); + ATF_REQUIRE(s2 >= 0); + s3 = socket(PF_INET6, SOCK_DGRAM, 0); + ATF_REQUIRE(s3 >= 0); + + error = setsockopt(s1, SOL_SOCKET, SO_REUSEPORT_LB, (int[]){1}, + sizeof(int)); + ATF_REQUIRE_MSG(error == 0, + "setsockopt(SO_REUSEPORT_LB) failed: %s", strerror(errno)); + error = bind(s1, (struct sockaddr *)&sin6, sizeof(sin6)); + ATF_REQUIRE_MSG(error == 0, "bind() failed: %s", strerror(errno)); + + error = bind(s2, (struct sockaddr *)&sin6, sizeof(sin6)); + ATF_REQUIRE_MSG(error == 0, "bind() failed: %s", strerror(errno)); + + error = bind(s3, (struct sockaddr *)&sin6, sizeof(sin6)); + ATF_REQUIRE_MSG(error == 0, "bind() failed: %s", strerror(errno)); + + /* Connect to an address not owned by s2. */ + error = getsockname(s3, (struct sockaddr *)&sin6, + (socklen_t[]){sizeof(sin6)}); + ATF_REQUIRE(error == 0); + error = connect(s1, (struct sockaddr *)&sin6, sizeof(sin6)); + ATF_REQUIRE_MSG(error == 0, "connect() failed: %s", strerror(errno)); + + /* Try to send a packet to s1 from s2. */ + error = getsockname(s1, (struct sockaddr *)&sin6, + (socklen_t[]){sizeof(sin6)}); + ATF_REQUIRE(error == 0); + + ch = 42; + n = sendto(s2, &ch, sizeof(ch), 0, (struct sockaddr *)&sin6, + sizeof(sin6)); + ATF_REQUIRE(n == 1); + + /* Give the packet some time to arrive. */ + usleep(100000); + + /* s1 is connected to s3 and shouldn't receive from s2. */ + error = ioctl(s1, FIONREAD, &len); + ATF_REQUIRE(error == 0); + ATF_REQUIRE_MSG(len == 0, "unexpected data available"); + + /* ... but s3 can of course send to s1. */ + n = sendto(s3, &ch, sizeof(ch), 0, (struct sockaddr *)&sin6, + sizeof(sin6)); + ATF_REQUIRE(n == 1); + usleep(100000); + error = ioctl(s1, FIONREAD, &len); + ATF_REQUIRE(error == 0); + ATF_REQUIRE_MSG(len == 1, "expected data available"); +} + ATF_TP_ADD_TCS(tp) { ATF_TP_ADD_TC(tp, basic_ipv4); @@ -561,6 +707,8 @@ ATF_TP_ADD_TCS(tp) ATF_TP_ADD_TC(tp, bind_without_listen); ATF_TP_ADD_TC(tp, connect_not_bound); ATF_TP_ADD_TC(tp, connect_bound); + ATF_TP_ADD_TC(tp, connect_udp); + ATF_TP_ADD_TC(tp, connect_udp6); return (atf_no_error()); }