mirror of
https://passt.top/passt
synced 2024-07-01 23:42:41 +00:00
passt: Add support for multiple instances in different network namespaces
...sharing the same filesystem. Instead of a fixed path for the UNIX domain socket, passt now uses a path with a counter, probing for existing instances, and picking the first free one. The demo script is updated accordingly -- it can now be started several times to create multiple namespaces with an instance of passt each, with addressing reflecting separate subnets, and NDP proxying between them. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio
parent
8ce188ecb0
commit
19d254bbbb
84
doc/demo.sh
84
doc/demo.sh
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@ -30,7 +30,7 @@ ipv6_mangle() {
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if [ ${__c} -lt 7 ]; then
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printf "${__16b}:"
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else
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printf "abcd\n" && break
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printf "%04x\n" $((0xabc0 + ${2})) && break
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fi
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__c=$((__c + 1))
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done
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@ -40,43 +40,66 @@ ipv6_mangle() {
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ndp_setup() {
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sysctl -w net.ipv6.conf.all.proxy_ndp=1
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ip -6 neigh add proxy "${1}" dev "$(ipv6_dev)"
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for i in `seq 1 63`; do
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__neigh="$(ipv6_mangle ${1} ${i})"
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if [ "${__neigh}" != "${1}" ]; then
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ip -6 neigh add proxy "${__neigh}" dev "${2}"
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fi
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done
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}
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ip netns del passt 2>/dev/null || :
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ip link del veth_passt 2>/dev/null || :
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ip netns add passt
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ip link add veth_passt up netns passt type veth peer name veth_passt
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ip link set dev veth_passt up
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ip -n passt link set dev lo up
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ns_idx=0
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for i in `seq 1 63`; do
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ns="passt_${i}"
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ns_idx=${i}
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busy=0
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for p in $(pidof passt); do
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[ "$(ip netns identify ${p})" = "${ns}" ] && busy=1 && break
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done
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[ ${busy} -eq 0 ] && break
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done
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ip -n passt addr add 192.0.2.2/24 dev veth_passt
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ip addr add 192.0.2.1/24 dev veth_passt
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ip -n passt route add default via 192.0.2.1
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[ ${busy} -ne 0 ] && echo "Couldn't create namespace" && exit 1
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ip netns del "${ns}" 2>/dev/null || :
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ip netns add "${ns}"
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ip link del "veth_${ns}" 2>/dev/null || :
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ip link add "veth_${ns}" up netns "${ns}" type veth peer name "veth_${ns}"
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ip link set dev "veth_${ns}" up
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ip -n "${ns}" link set dev lo up
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ipv4_main="192.0.2.$(((ns_idx - 1) * 4 + 1))"
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ipv4_ns="192.0.2.$(((ns_idx - 1) * 4 + 2))"
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ip -n "${ns}" addr add "${ipv4_ns}/30" dev "veth_${ns}"
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ip addr add "${ipv4_main}/30" dev "veth_${ns}"
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ip -n "${ns}" route add default via "${ipv4_main}"
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sysctl -w net.ipv4.ip_forward=1
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nft delete table passt_nat 2>/dev/null || :
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nft add table passt_nat
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nft 'add chain passt_nat postrouting { type nat hook postrouting priority -100 ; }'
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nft add rule passt_nat postrouting ip saddr 192.0.2.2 masquerade
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nft delete table "${ns}_nat" 2>/dev/null || :
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nft add table "${ns}_nat"
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nft add chain "${ns}_nat" postrouting '{ type nat hook postrouting priority -100 ; }'
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nft add rule "${ns}_nat" postrouting ip saddr "${ipv4_ns}" masquerade
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ipv6_addr="$(ipv6_devaddr "$(ipv6_dev)")"
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ipv6_passt="$(ipv6_mangle "${ipv6_addr}")"
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ndp_setup "${ipv6_passt}"
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ip -n passt addr add "${ipv6_passt}/$(ipv6_mask "${ipv6_addr}")" dev veth_passt
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ip addr add "${ipv6_addr}" dev veth_passt
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ip route add "${ipv6_passt}" dev veth_passt
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passt_ll="$(ipv6_ll_addr "veth_passt")"
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main_ll="$(get_token "link/ether" $(ip -o li sh veth_passt))"
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ip neigh add "${passt_ll%%/*}" dev veth_passt lladdr "${main_ll}"
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ip -n passt route add default via "${passt_ll%%/*}" dev veth_passt
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ipv6_passt="$(ipv6_mangle "${ipv6_addr}" ${ns_idx})"
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ndp_setup "${ipv6_passt}" "veth_${ns}"
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ip -n "${ns}" addr add "${ipv6_passt}/$(ipv6_mask "${ipv6_addr}")" dev "veth_${ns}"
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ip addr add "${ipv6_addr}" dev "veth_${ns}"
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ip route add "${ipv6_passt}" dev "veth_${ns}"
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passt_ll="$(ipv6_ll_addr "veth_${ns}")"
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main_ll="$(get_token "link/ether" $(ip -o li sh "veth_${ns}"))"
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ip neigh add "${passt_ll%%/*}" dev "veth_${ns}" lladdr "${main_ll}"
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ip -n "${ns}" route add default via "${passt_ll%%/*}" dev "veth_${ns}"
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sysctl -w net.ipv6.conf.all.forwarding=1
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ethtool -K veth_passt tx off
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ip netns exec passt ethtool -K veth_passt tx off
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ip netns exec passt sysctl -w net.ipv4.ping_group_range="0 2147483647"
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ethtool -K "veth_${ns}" tx off
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ip netns exec "${ns}" ethtool -K "veth_${ns}" tx off
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ip netns exec "${ns}" sysctl -w net.ipv4.ping_group_range="0 2147483647"
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sysctl -w net.core.rmem_max=16777216
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@ -84,5 +107,12 @@ sysctl -w net.core.wmem_max=16777216
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sysctl -w net.core.rmem_default=16777216
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sysctl -w net.core.wmem_default=16777216
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echo
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echo "Namespace ${ns} set up, addresses:"
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echo " ${ipv4_ns}"
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echo " ${ipv6_passt}"
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echo
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echo "Starting passt..."
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echo
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ip netns exec passt ./passt
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ip netns exec "${ns}" ./passt
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46
passt.c
46
passt.c
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@ -20,7 +20,6 @@
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#include <sys/ioctl.h>
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#include <sys/resource.h>
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#include <sys/uio.h>
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#include <sys/un.h>
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#include <ifaddrs.h>
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#include <linux/if_ether.h>
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#include <linux/if_packet.h>
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@ -30,6 +29,7 @@
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#include <linux/tcp.h>
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#include <linux/udp.h>
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#include <linux/icmpv6.h>
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#include <linux/un.h>
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#include <linux/if_link.h>
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#include <net/ethernet.h>
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#include <stdlib.h>
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@ -82,31 +82,50 @@ static char *ip_proto_str[IPPROTO_SCTP + 1] = {
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/**
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* sock_unix() - Create and bind AF_UNIX socket, add to epoll list
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* @index: Index used in socket path, filled on success
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*
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* Return: newly created socket, doesn't return on error
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*/
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static int sock_unix(void)
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static int sock_unix(int *index)
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{
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int fd = socket(AF_UNIX, SOCK_STREAM, 0);
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int fd = socket(AF_UNIX, SOCK_STREAM, 0), ex;
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struct sockaddr_un addr = {
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.sun_family = AF_UNIX,
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.sun_path = UNIX_SOCK_PATH,
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};
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int i, ret;
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if (fd < 0) {
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perror("UNIX socket");
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exit(EXIT_FAILURE);
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}
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unlink(UNIX_SOCK_PATH);
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if (bind(fd, (const struct sockaddr *)&addr, sizeof(addr)) < 0) {
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for (i = 1; i < UNIX_SOCK_MAX; i++) {
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snprintf(addr.sun_path, UNIX_PATH_MAX, UNIX_SOCK_PATH, i);
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ex = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0);
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ret = connect(ex, (const struct sockaddr *)&addr, sizeof(addr));
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if (!ret || errno != ECONNREFUSED) {
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close(ex);
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continue;
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}
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close(ex);
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unlink(addr.sun_path);
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if (!bind(fd, (const struct sockaddr *)&addr, sizeof(addr)))
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break;
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}
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if (i == UNIX_SOCK_MAX) {
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perror("UNIX socket bind");
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exit(EXIT_FAILURE);
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}
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chmod(UNIX_SOCK_PATH,
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info("UNIX domain socket bound at %s\n", addr.sun_path);
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chmod(addr.sun_path,
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S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
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*index = i;
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return fd;
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}
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@ -743,11 +762,11 @@ void usage(const char *name)
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int main(int argc, char **argv)
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{
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struct epoll_event events[EPOLL_EVENTS];
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int nfds, i, fd_unix, sock_index;
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char buf6[INET6_ADDRSTRLEN];
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char buf4[INET_ADDRSTRLEN];
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struct epoll_event ev = { 0 };
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struct ctx c = { 0 };
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int nfds, i, fd_unix;
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struct rlimit limit;
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struct timespec now;
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@ -785,7 +804,7 @@ int main(int argc, char **argv)
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get_addrs(&c);
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get_dns(&c);
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fd_unix = sock_unix();
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fd_unix = sock_unix(&sock_index);
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if (icmp_sock_init(&c) || udp_sock_init(&c) || tcp_sock_init(&c))
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exit(EXIT_FAILURE);
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@ -795,7 +814,7 @@ int main(int argc, char **argv)
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memset(&c.mac_guest, 0xff, sizeof(c.mac_guest));
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pcap_init();
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pcap_init(sock_index);
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if (c.v4) {
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info("ARP:");
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@ -841,14 +860,14 @@ int main(int argc, char **argv)
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}
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listen:
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listen(fd_unix, 1);
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listen(fd_unix, 0);
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info("You can now start qrap:");
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info(" ./qrap 5 kvm ... -net socket,fd=5 -net nic,model=virtio");
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info("or directly qemu, patched with:");
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info(" qemu/0001-net-Allow-also-UNIX-domain-sockets-to-be-used-as-net.patch");
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info("as follows:");
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info(" kvm ... -net socket,connect="
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UNIX_SOCK_PATH " -net nic,model=virtio");
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info(" kvm ... -net socket,connect=" UNIX_SOCK_PATH
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" -net nic,model=virtio", sock_index);
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#ifndef DEBUG
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if (daemon(0, 0)) {
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@ -858,6 +877,7 @@ listen:
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#endif
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c.fd_unix = accept(fd_unix, NULL, NULL);
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ev.events = EPOLLIN | EPOLLRDHUP | EPOLLERR | EPOLLHUP;
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ev.data.fd = c.fd_unix;
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epoll_ctl(c.epollfd, EPOLL_CTL_ADD, c.fd_unix, &ev);
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5
passt.h
5
passt.h
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@ -1,4 +1,5 @@
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#define UNIX_SOCK_PATH "/tmp/passt.socket"
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#define UNIX_SOCK_MAX 100
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#define UNIX_SOCK_PATH "/tmp/passt_%i.socket"
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/**
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* struct tap_msg - Generic message descriptor for arrays of messages
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@ -26,6 +27,8 @@ struct fqdn {
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char n[NS_MAXDNAME];
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};
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#include <net/if.h>
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/**
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* struct ctx - Execution context
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* @epollfd: file descriptor for epoll instance
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14
pcap.c
14
pcap.c
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@ -20,6 +20,10 @@
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#include <time.h>
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#include <net/ethernet.h>
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#include <unistd.h>
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#include <net/if.h>
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#include "passt.h"
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#include "util.h"
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#ifdef DEBUG
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@ -77,9 +81,9 @@ void pcap(char *pkt, size_t len)
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write(pcap_fd, pkt, len);
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}
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void pcap_init(void)
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void pcap_init(int sock_index)
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{
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char name[] = PCAP_PREFIX PCAP_ISO8601_STR ".pcap";
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char name[] = PCAP_PREFIX PCAP_ISO8601_STR STR(UNIX_SOCK_MAX) ".pcap";
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struct timeval tv;
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struct tm *tm;
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@ -88,6 +92,10 @@ void pcap_init(void)
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strftime(name + strlen(PCAP_PREFIX), sizeof(PCAP_ISO8601_STR) - 1,
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PCAP_ISO8601_FORMAT, tm);
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snprintf(name + strlen(PCAP_PREFIX) + strlen(PCAP_ISO8601_STR),
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sizeof(name) - strlen(PCAP_PREFIX) - strlen(PCAP_ISO8601_STR),
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"_%i.pcap", sock_index);
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pcap_fd = open(name, O_WRONLY | O_CREAT | O_APPEND | O_DSYNC,
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S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
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if (pcap_fd == -1) {
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@ -95,6 +103,8 @@ void pcap_init(void)
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return;
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}
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info("Saving packet capture at %s", name);
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write(pcap_fd, &pcap_hdr, sizeof(pcap_hdr));
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}
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2
pcap.h
2
pcap.h
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@ -1,2 +1,2 @@
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void pcap(char *pkt, size_t len);
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void pcap_init(void);
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void pcap_init(int sock_index);
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7
util.h
7
util.h
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@ -29,6 +29,9 @@ void debug(const char *format, ...);
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#define MAX(x, y) (((x) > (y)) ? (x) : (y))
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#endif
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#define STRINGIFY(x) #x
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#define STR(x) STRINGIFY(x)
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#define ARRAY_SIZE(a) ((int)(sizeof(a) / sizeof((a)[0])))
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#define IN_INTERVAL(a, b, x) ((x) >= (a) && (x) <= (b))
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@ -37,6 +40,10 @@ void debug(const char *format, ...);
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#define PORT_IS_EPHEMERAL(port) ((port) >= (1 << 15) + (1 << 14)) /* RFC 6335 */
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#include <linux/ipv6.h>
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#include <net/if.h>
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#include <linux/ip.h>
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uint16_t csum_fold(uint32_t sum);
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uint16_t csum_ip4(void *buf, size_t len);
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void csum_tcp4(struct iphdr *iph);
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