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package ovn | ||
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import ( | ||
"fmt" | ||
"strconv" | ||
"strings" | ||
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"yunion.io/x/ovsdb/schema/ovn_nb" | ||
"yunion.io/x/pkg/errors" | ||
"yunion.io/x/pkg/util/secrules" | ||
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agentmodels "yunion.io/x/onecloud/pkg/vpcagent/models" | ||
) | ||
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const ( | ||
errBadSecgroupRule = errors.Error("bad security group rule") | ||
) | ||
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const ( | ||
aclDirToLport = "to-lport" | ||
aclDirFromLport = "from-lport" | ||
) | ||
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func ruleToAcl(lport string, rule *agentmodels.SecurityGroupRule) (*ovn_nb.ACL, error) { | ||
var ( | ||
dir string | ||
action string | ||
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match string | ||
matches []string | ||
subfn string | ||
errs []error | ||
) | ||
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switch secrules.TSecurityRuleDirection(rule.Direction) { | ||
case secrules.SecurityRuleIngress: | ||
dir = aclDirToLport | ||
subfn = "src" | ||
matches = append(matches, fmt.Sprintf("outport == %q", lport)) | ||
case secrules.SecurityRuleEgress: | ||
dir = aclDirFromLport | ||
subfn = "dst" | ||
matches = append(matches, fmt.Sprintf("inport == %q", lport)) | ||
default: | ||
return nil, errors.Wrapf(errBadSecgroupRule, "unknown direction %q", rule.Direction) | ||
} | ||
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switch secrules.TSecurityRuleAction(rule.Action) { | ||
case secrules.SecurityRuleAllow: | ||
action = "allow-related" | ||
case secrules.SecurityRuleDeny: | ||
action = "drop" | ||
default: | ||
return nil, errors.Wrapf(errBadSecgroupRule, "unknown action %q", rule.Action) | ||
} | ||
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addL3Match := func() { | ||
matches = append(matches, "ip4") | ||
if cidr := strings.TrimSpace(rule.CIDR); cidr != "" && cidr != "0.0.0.0/0" { | ||
matches = append(matches, fmt.Sprintf("ip4.%s == %s", subfn, cidr)) | ||
} | ||
} | ||
addL4Match := func(l4proto string) { | ||
var ( | ||
l4portfn = fmt.Sprintf("%s.%s", l4proto, subfn) | ||
portMatches []string | ||
) | ||
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parsePort := func(pstr string) (int, error) { | ||
pn, err := strconv.ParseUint(pstr, 10, 16) | ||
if err != nil { | ||
return -1, err | ||
} | ||
return int(pn), nil | ||
} | ||
for _, pstr := range strings.Split(rule.Ports, ",") { | ||
pstr = strings.TrimSpace(pstr) | ||
if pstr == "" { | ||
continue | ||
} | ||
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if i := strings.Index(pstr, "-"); i >= 0 { | ||
spstr := strings.TrimSpace(pstr[:i]) | ||
epstr := strings.TrimSpace(pstr[i+1:]) | ||
if spstr == "" || epstr == "" { | ||
continue | ||
} | ||
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spn, err := parsePort(spstr) | ||
if err != nil { | ||
errs = append(errs, errors.Wrap(err, "start port")) | ||
} | ||
epn, err := parsePort(epstr) | ||
if err != nil { | ||
errs = append(errs, errors.Wrap(err, "end port")) | ||
} | ||
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if spn > epn { | ||
spn, epn = epn, spn | ||
} | ||
if spn < epn { | ||
portMatches = append(portMatches, | ||
fmt.Sprintf("( %s >= %d && %s <= %d )", | ||
l4portfn, spn, l4portfn, epn)) | ||
} else /* spn == epn */ { | ||
portMatches = append(portMatches, | ||
fmt.Sprintf("%s == %d", l4portfn, spn)) | ||
} | ||
} else { | ||
if pn, err := parsePort(pstr); err != nil { | ||
errs = append(errs, errors.Wrap(err, "port")) | ||
} else { | ||
portMatches = append(portMatches, | ||
fmt.Sprintf("%s == %d", l4portfn, pn)) | ||
} | ||
} | ||
} | ||
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matches = append(matches, l4proto) | ||
if len(portMatches) > 0 { | ||
matches = append(matches, strings.Join(portMatches, " || ")) | ||
} | ||
} | ||
switch rule.Protocol { | ||
case secrules.PROTO_ANY: | ||
addL3Match() | ||
case secrules.PROTO_TCP: | ||
addL3Match() | ||
addL4Match("tcp") | ||
case secrules.PROTO_UDP: | ||
addL3Match() | ||
addL4Match("udp") | ||
case secrules.PROTO_ICMP: | ||
addL3Match() | ||
matches = append(matches, "icmp4") | ||
default: | ||
return nil, errors.Wrapf(errBadSecgroupRule, "unknown protocol %q", rule.Protocol) | ||
} | ||
if len(errs) > 0 { | ||
return nil, errors.NewAggregate(errs) | ||
} | ||
match = strings.Join(matches, " && ") | ||
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acl := &ovn_nb.ACL{ | ||
Priority: rule.Priority, | ||
Direction: dir, | ||
Match: match, | ||
Action: action, | ||
} | ||
return acl, nil | ||
} |